glsl-optimizer/src/compiler/glsl/ast_to

Bug Summary

File:	root/firefox-clang/third_party/rust/glslopt/glsl-optimizer/src/compiler/glsl/ast_to_hir.cpp
Warning:	line 8797, column 37 Assigned value is uninitialized
Annotated Source Code

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1/*
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/

24/**
* \file ast_to_hir.c
* Convert abstract syntax to to high-level intermediate reprensentation (HIR).
*
* During the conversion to HIR, the majority of the symantic checking is
* preformed on the program.  This includes:
*
*    * Symbol table management
*    * Type checking
*    * Function binding
*
* The majority of this work could be done during parsing, and the parser could
* probably generate HIR directly.  However, this results in frequent changes
* to the parser code.  Since we do not assume that every system this complier
* is built on will have Flex and Bison installed, we have to store the code
* generated by these tools in our version control system.  In other parts of
* the system we've seen problems where a parser was changed but the generated
* code was not committed, merge conflicts where created because two developers
* had slightly different versions of Bison installed, etc.
*
* I have also noticed that running Bison generated parsers in GDB is very
* irritating.  When you get a segfault on '$$ = $1->foo', you can't very
* well 'print $1' in GDB.
*
* As a result, my preference is to put as little C code as possible in the
* parser (and lexer) sources.
*/

52#include "glsl_symbol_table.h"
53#include "glsl_parser_extras.h"
54#include "ast.h"
55#include "compiler/glsl_types.h"
56#include "util/hash_table.h"
57#include "main/mtypes.h"
58#include "main/macros.h"
59#include "main/shaderobj.h"
60#include "ir.h"
61#include "ir_builder.h"
62#include "builtin_functions.h"

64using namespace ir_builder;

66static void
67detect_conflicting_assignments(struct _mesa_glsl_parse_state *state,
                             exec_list *instructions);
69static void
70verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state *state);

72static void
73remove_per_vertex_blocks(exec_list *instructions,
                       _mesa_glsl_parse_state *state, ir_variable_mode mode);

76/**
* Visitor class that finds the first instance of any write-only variable that
* is ever read, if any
*/
80class read_from_write_only_variable_visitor : public ir_hierarchical_visitor
81{
82public:
 read_from_write_only_variable_visitor() : found(NULL__null)
 {
 }

 virtual ir_visitor_status visit(ir_dereference_variable *ir)
 {
    if (this->in_assignee)
       return visit_continue;

    ir_variable *var = ir->variable_referenced();
    /* We can have memory_write_only set on both images and buffer variables,
     * but in the former there is a distinction between reads from
     * the variable itself (write_only) and from the memory they point to
     * (memory_write_only), while in the case of buffer variables there is
     * no such distinction, that is why this check here is limited to
     * buffer variables alone.
     */
    if (!var || var->data.mode != ir_var_shader_storage)
       return visit_continue;

    if (var->data.memory_write_only) {
       found = var;
       return visit_stop;
    }

    return visit_continue;
 }

 ir_variable *get_variable() {
    return found;
 }

 virtual ir_visitor_status visit_enter(ir_expression *ir)
 {
    /* .length() doesn't actually read anything */
    if (ir->operation == ir_unop_ssbo_unsized_array_length)
       return visit_continue_with_parent;

    return visit_continue;
 }

124private:
 ir_variable *found;
126};

128void
129_mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
130{
 _mesa_glsl_initialize_variables(instructions, state);

 state->symbols->separate_function_namespace = state->language_version == 110;

 state->current_function = NULL__null;

 state->toplevel_ir = instructions;

 state->gs_input_prim_type_specified = false;
 state->tcs_output_vertices_specified = false;
 state->cs_input_local_size_specified = false;

 /* Section 4.2 of the GLSL 1.20 specification states:
  * "The built-in functions are scoped in a scope outside the global scope
  *  users declare global variables in.  That is, a shader's global scope,
  *  available for user-defined functions and global variables, is nested
  *  inside the scope containing the built-in functions."
  *
  * Since built-in functions like ftransform() access built-in variables,
  * it follows that those must be in the outer scope as well.
  *
  * We push scope here to create this nesting effect...but don't pop.
  * This way, a shader's globals are still in the symbol table for use
  * by the linker.
  */
 state->symbols->push_scope();

 foreach_list_typed (ast_node, ast, link, & state->translation_unit)for (ast_node * ast = (!exec_node_is_tail_sentinel((& state
->translation_unit)->head_sentinel.next) ? ((ast_node *
) (((uintptr_t) (& state->translation_unit)->head_sentinel
.next) - (((char *) &((ast_node *) (& state->translation_unit
)->head_sentinel.next)->link) - ((char *) (& state->
translation_unit)->head_sentinel.next)))) : __null); (ast)
 != __null; (ast) = (!exec_node_is_tail_sentinel((ast)->link
.next) ? ((ast_node *) (((uintptr_t) (ast)->link.next) - (
((char *) &((ast_node *) (ast)->link.next)->link) -
 ((char *) (ast)->link.next)))) : __null))
    ast->hir(instructions, state);

 verify_subroutine_associated_funcs(state);
 detect_recursion_unlinked(state, instructions);
 detect_conflicting_assignments(state, instructions);

 state->toplevel_ir = NULL__null;

 /* Move all of the variable declarations to the front of the IR list, and
  * reverse the order.  This has the (intended!) side effect that vertex
  * shader inputs and fragment shader outputs will appear in the IR in the
  * same order that they appeared in the shader code.  This results in the
  * locations being assigned in the declared order.  Many (arguably buggy)
  * applications depend on this behavior, and it matches what nearly all
  * other drivers do.
  * However, do not push the declarations before struct decls or precision
  * statements.
  */
 ir_instruction* before_node = (ir_instruction*)instructions->get_head();
 ir_instruction* after_node = NULL__null;
 while (before_node && (before_node->ir_type == ir_type_precision || before_node->ir_type == ir_type_typedecl))
 {
    after_node = before_node;
    before_node = (ir_instruction*)before_node->next;
 }

 foreach_in_list_safe(ir_instruction, node, instructions)for (ir_instruction *node = (!exec_node_is_tail_sentinel((instructions
)->head_sentinel.next) ? (ir_instruction *) ((instructions
)->head_sentinel.next) : __null), *__next = (node) ? (!exec_node_is_tail_sentinel
((instructions)->head_sentinel.next->next) ? (ir_instruction
 *) ((instructions)->head_sentinel.next->next) : __null
) : __null; (node) != __null; (node) = __next, __next = __next
 ? (!exec_node_is_tail_sentinel(__next->next) ? (ir_instruction
 *) (__next->next) : __null) : __null) {
    ir_variable *const var = node->as_variable();

    if (var == NULL__null)
       continue;

    var->remove();
    if (after_node)
       after_node->insert_after(var);
    else
       instructions->push_head(var);
 }

 /* Figure out if gl_FragCoord is actually used in fragment shader */
 ir_variable *const var = state->symbols->get_variable("gl_FragCoord");
 if (var != NULL__null)
    state->fs_uses_gl_fragcoord = var->data.used;

 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
  *
  *     If multiple shaders using members of a built-in block belonging to
  *     the same interface are linked together in the same program, they
  *     must all redeclare the built-in block in the same way, as described
  *     in section 4.3.7 "Interface Blocks" for interface block matching, or
  *     a link error will result.
  *
  * The phrase "using members of a built-in block" implies that if two
  * shaders are linked together and one of them *does not use* any members
  * of the built-in block, then that shader does not need to have a matching
  * redeclaration of the built-in block.
  *
  * This appears to be a clarification to the behaviour established for
  * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
  * version.
  *
  * The definition of "interface" in section 4.3.7 that applies here is as
  * follows:
  *
  *     The boundary between adjacent programmable pipeline stages: This
  *     spans all the outputs in all compilation units of the first stage
  *     and all the inputs in all compilation units of the second stage.
  *
  * Therefore this rule applies to both inter- and intra-stage linking.
  *
  * The easiest way to implement this is to check whether the shader uses
  * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
  * remove all the relevant variable declaration from the IR, so that the
  * linker won't see them and complain about mismatches.
  */
 remove_per_vertex_blocks(instructions, state, ir_var_shader_in);
 remove_per_vertex_blocks(instructions, state, ir_var_shader_out);

 /* Check that we don't have reads from write-only variables */
 read_from_write_only_variable_visitor v;
 v.run(instructions);
 ir_variable *error_var = v.get_variable();
 if (error_var) {
    /* It would be nice to have proper location information, but for that
     * we would need to check this as we process each kind of AST node
     */
    YYLTYPE loc;
    memset(&loc, 0, sizeof(loc));
    _mesa_glsl_error(&loc, state, "Read from write-only variable `%s'",
                     error_var->name);
 }
250}


253static ir_expression_operation
254get_implicit_conversion_operation(const glsl_type *to, const glsl_type *from,
                                struct _mesa_glsl_parse_state *state)
256{
 switch (to->base_type) {
 case GLSL_TYPE_FLOAT:
    switch (from->base_type) {
    case GLSL_TYPE_INT: return ir_unop_i2f;
    case GLSL_TYPE_UINT: return ir_unop_u2f;
    default: return (ir_expression_operation)0;
    }

 case GLSL_TYPE_UINT:
    if (!state->has_implicit_uint_to_int_conversion())
       return (ir_expression_operation)0;
    switch (from->base_type) {
       case GLSL_TYPE_INT: return ir_unop_i2u;
       default: return (ir_expression_operation)0;
    }

 case GLSL_TYPE_DOUBLE:
    if (!state->has_double())
       return (ir_expression_operation)0;
    switch (from->base_type) {
    case GLSL_TYPE_INT: return ir_unop_i2d;
    case GLSL_TYPE_UINT: return ir_unop_u2d;
    case GLSL_TYPE_FLOAT: return ir_unop_f2d;
    case GLSL_TYPE_INT64: return ir_unop_i642d;
    case GLSL_TYPE_UINT64: return ir_unop_u642d;
    default: return (ir_expression_operation)0;
    }

 case GLSL_TYPE_UINT64:
    if (!state->has_int64())
       return (ir_expression_operation)0;
    switch (from->base_type) {
    case GLSL_TYPE_INT: return ir_unop_i2u64;
    case GLSL_TYPE_UINT: return ir_unop_u2u64;
    case GLSL_TYPE_INT64: return ir_unop_i642u64;
    default: return (ir_expression_operation)0;
    }

 case GLSL_TYPE_INT64:
    if (!state->has_int64())
       return (ir_expression_operation)0;
    switch (from->base_type) {
    case GLSL_TYPE_INT: return ir_unop_i2i64;
    default: return (ir_expression_operation)0;
    }

 default: return (ir_expression_operation)0;
 }
305}


308/**
* If a conversion is available, convert one operand to a different type
*
* The \c from \c ir_rvalue is converted "in place".
*
* \param to     Type that the operand it to be converted to
* \param from   Operand that is being converted
* \param state  GLSL compiler state
*
* \return
* If a conversion is possible (or unnecessary), \c true is returned.
* Otherwise \c false is returned.
*/
321static bool
322apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
                        struct _mesa_glsl_parse_state *state)
324{
 void *ctx = state;
 if (to->base_type == from->type->base_type)
    return true;

 /* Prior to GLSL 1.20, there are no implicit conversions */
 if (!state->has_implicit_conversions())
    return false;

 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
  *
  *    "There are no implicit array or structure conversions. For
  *    example, an array of int cannot be implicitly converted to an
  *    array of float.
  */
 if (!to->is_numeric() || !from->type->is_numeric())
    return false;

 /* We don't actually want the specific type `to`, we want a type
  * with the same base type as `to`, but the same vector width as
  * `from`.
  */
 to = glsl_type::get_instance(to->base_type, from->type->vector_elements,
                              from->type->matrix_columns);

 ir_expression_operation op = get_implicit_conversion_operation(to, from->type, state);
 if (op) {
    from = new(ctx) ir_expression(op, to, from, NULL__null);
    return true;
 } else {
    return false;
 }
356}


359static const struct glsl_type *
360arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
                     bool multiply,
                     struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
363{
 const glsl_type *type_a = value_a->type;
 const glsl_type *type_b = value_b->type;

 /* From GLSL 1.50 spec, page 56:
  *
  *    "The arithmetic binary operators add (+), subtract (-),
  *    multiply (*), and divide (/) operate on integer and
  *    floating-point scalars, vectors, and matrices."
  */
 if (!type_a->is_numeric() || !type_b->is_numeric()) {
    _mesa_glsl_error(loc, state,
                     "operands to arithmetic operators must be numeric");
    return glsl_type::error_type;
 }


 /*    "If one operand is floating-point based and the other is
  *    not, then the conversions from Section 4.1.10 "Implicit
  *    Conversions" are applied to the non-floating-point-based operand."
  */
 if (!apply_implicit_conversion(type_a, value_b, state)
     && !apply_implicit_conversion(type_b, value_a, state)) {
    _mesa_glsl_error(loc, state,
                     "could not implicitly convert operands to "
                     "arithmetic operator");
    return glsl_type::error_type;
 }
 type_a = value_a->type;
 type_b = value_b->type;

 /*    "If the operands are integer types, they must both be signed or
  *    both be unsigned."
  *
  * From this rule and the preceeding conversion it can be inferred that
  * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
  * The is_numeric check above already filtered out the case where either
  * type is not one of these, so now the base types need only be tested for
  * equality.
  */
 if (type_a->base_type != type_b->base_type) {
    _mesa_glsl_error(loc, state,
                     "base type mismatch for arithmetic operator");
    return glsl_type::error_type;
 }

 /*    "All arithmetic binary operators result in the same fundamental type
  *    (signed integer, unsigned integer, or floating-point) as the
  *    operands they operate on, after operand type conversion. After
  *    conversion, the following cases are valid
  *
  *    * The two operands are scalars. In this case the operation is
  *      applied, resulting in a scalar."
  */
 if (type_a->is_scalar() && type_b->is_scalar())
    return type_a;

 /*   "* One operand is a scalar, and the other is a vector or matrix.
  *      In this case, the scalar operation is applied independently to each
  *      component of the vector or matrix, resulting in the same size
  *      vector or matrix."
  */
 if (type_a->is_scalar()) {
    if (!type_b->is_scalar())
       return type_b;
 } else if (type_b->is_scalar()) {
    return type_a;
 }

 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
  * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
  * handled.
  */
 assert(!type_a->is_scalar())(static_cast <bool> (!type_a->is_scalar()) ? void (0
) : __assert_fail ("!type_a->is_scalar()", __builtin_FILE (
), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));
 assert(!type_b->is_scalar())(static_cast <bool> (!type_b->is_scalar()) ? void (0
) : __assert_fail ("!type_b->is_scalar()", __builtin_FILE (
), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

 /*   "* The two operands are vectors of the same size. In this case, the
  *      operation is done component-wise resulting in the same size
  *      vector."
  */
 if (type_a->is_vector() && type_b->is_vector()) {
    if (type_a == type_b) {
       return type_a;
    } else {
       _mesa_glsl_error(loc, state,
                        "vector size mismatch for arithmetic operator");
       return glsl_type::error_type;
    }
 }

 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
  * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
  * <vector, vector> have been handled.  At least one of the operands must
  * be matrix.  Further, since there are no integer matrix types, the base
  * type of both operands must be float.
  */
 assert(type_a->is_matrix() || type_b->is_matrix())(static_cast <bool> (type_a->is_matrix() || type_b->
is_matrix()) ? void (0) : __assert_fail ("type_a->is_matrix() || type_b->is_matrix()"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
 assert(type_a->is_float() || type_a->is_double())(static_cast <bool> (type_a->is_float() || type_a->
is_double()) ? void (0) : __assert_fail ("type_a->is_float() || type_a->is_double()"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
 assert(type_b->is_float() || type_b->is_double())(static_cast <bool> (type_b->is_float() || type_b->
is_double()) ? void (0) : __assert_fail ("type_b->is_float() || type_b->is_double()"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

 /*   "* The operator is add (+), subtract (-), or divide (/), and the
  *      operands are matrices with the same number of rows and the same
  *      number of columns. In this case, the operation is done component-
  *      wise resulting in the same size matrix."
  *    * The operator is multiply (*), where both operands are matrices or
  *      one operand is a vector and the other a matrix. A right vector
  *      operand is treated as a column vector and a left vector operand as a
  *      row vector. In all these cases, it is required that the number of
  *      columns of the left operand is equal to the number of rows of the
  *      right operand. Then, the multiply (*) operation does a linear
  *      algebraic multiply, yielding an object that has the same number of
  *      rows as the left operand and the same number of columns as the right
  *      operand. Section 5.10 "Vector and Matrix Operations" explains in
  *      more detail how vectors and matrices are operated on."
  */
 if (! multiply) {
    if (type_a == type_b)
       return type_a;
 } else {
    const glsl_type *type = glsl_type::get_mul_type(type_a, type_b);

    if (type == glsl_type::error_type) {
       _mesa_glsl_error(loc, state,
                        "size mismatch for matrix multiplication");
    }

    return type;
 }


 /*    "All other cases are illegal."
  */
 _mesa_glsl_error(loc, state, "type mismatch");
 return glsl_type::error_type;
497}


500static const struct glsl_type *
501unary_arithmetic_result_type(const struct glsl_type *type,
                           struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
503{
 /* From GLSL 1.50 spec, page 57:
  *
  *    "The arithmetic unary operators negate (-), post- and pre-increment
  *     and decrement (-- and ++) operate on integer or floating-point
  *     values (including vectors and matrices). All unary operators work
  *     component-wise on their operands. These result with the same type
  *     they operated on."
  */
 if (!type->is_numeric()) {
    _mesa_glsl_error(loc, state,
                     "operands to arithmetic operators must be numeric");
    return glsl_type::error_type;
 }

 return type;
519}

521/**
* \brief Return the result type of a bit-logic operation.
*
* If the given types to the bit-logic operator are invalid, return
* glsl_type::error_type.
*
* \param value_a LHS of bit-logic op
* \param value_b RHS of bit-logic op
*/
530static const struct glsl_type *
531bit_logic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
                    ast_operators op,
                    struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
534{
 const glsl_type *type_a = value_a->type;
 const glsl_type *type_b = value_b->type;

 if (!state->check_bitwise_operations_allowed(loc)) {
    return glsl_type::error_type;
 }

 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
  *
  *     "The bitwise operators and (&), exclusive-or (^), and inclusive-or
  *     (|). The operands must be of type signed or unsigned integers or
  *     integer vectors."
  */
 if (!type_a->is_integer_32_64()) {
    _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer",
                      ast_expression::operator_string(op));
    return glsl_type::error_type;
 }
 if (!type_b->is_integer_32_64()) {
    _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer",
                     ast_expression::operator_string(op));
    return glsl_type::error_type;
 }

 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
  * make sense for bitwise operations, as they don't operate on floats.
  *
  * GLSL 4.0 added implicit int -> uint conversions, which are relevant
  * here.  It wasn't clear whether or not we should apply them to bitwise
  * operations.  However, Khronos has decided that they should in future
  * language revisions.  Applications also rely on this behavior.  We opt
  * to apply them in general, but issue a portability warning.
  *
  * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
  */
 if (type_a->base_type != type_b->base_type) {
    if (!apply_implicit_conversion(type_a, value_b, state)
        && !apply_implicit_conversion(type_b, value_a, state)) {
       _mesa_glsl_error(loc, state,
                        "could not implicitly convert operands to "
                        "`%s` operator",
                        ast_expression::operator_string(op));
       return glsl_type::error_type;
    } else {
       _mesa_glsl_warning(loc, state,
                          "some implementations may not support implicit "
                          "int -> uint conversions for `%s' operators; "
                          "consider casting explicitly for portability",
                          ast_expression::operator_string(op));
    }
    type_a = value_a->type;
    type_b = value_b->type;
 }

 /*     "The fundamental types of the operands (signed or unsigned) must
  *     match,"
  */
 if (type_a->base_type != type_b->base_type) {
    _mesa_glsl_error(loc, state, "operands of `%s' must have the same "
                     "base type", ast_expression::operator_string(op));
    return glsl_type::error_type;
 }

 /*     "The operands cannot be vectors of differing size." */
 if (type_a->is_vector() &&
     type_b->is_vector() &&
     type_a->vector_elements != type_b->vector_elements) {
    _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of "
                     "different sizes", ast_expression::operator_string(op));
    return glsl_type::error_type;
 }

 /*     "If one operand is a scalar and the other a vector, the scalar is
  *     applied component-wise to the vector, resulting in the same type as
  *     the vector. The fundamental types of the operands [...] will be the
  *     resulting fundamental type."
  */
 if (type_a->is_scalar())
     return type_b;
 else
     return type_a;
616}

618static const struct glsl_type *
619modulus_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
                  struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
621{
 const glsl_type *type_a = value_a->type;
 const glsl_type *type_b = value_b->type;

 if (!state->EXT_gpu_shader4_enable &&
     !state->check_version(130, 300, loc, "operator '%%' is reserved")) {
    return glsl_type::error_type;
 }

 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
  *
  *    "The operator modulus (%) operates on signed or unsigned integers or
  *    integer vectors."
  */
 if (!type_a->is_integer_32_64()) {
    _mesa_glsl_error(loc, state, "LHS of operator %% must be an integer");
    return glsl_type::error_type;
 }
 if (!type_b->is_integer_32_64()) {
    _mesa_glsl_error(loc, state, "RHS of operator %% must be an integer");
    return glsl_type::error_type;
 }

 /*    "If the fundamental types in the operands do not match, then the
  *    conversions from section 4.1.10 "Implicit Conversions" are applied
  *    to create matching types."
  *
  * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
  * int -> uint conversion rules.  Prior to that, there were no implicit
  * conversions.  So it's harmless to apply them universally - no implicit
  * conversions will exist.  If the types don't match, we'll receive false,
  * and raise an error, satisfying the GLSL 1.50 spec, page 56:
  *
  *    "The operand types must both be signed or unsigned."
  */
 if (!apply_implicit_conversion(type_a, value_b, state) &&
     !apply_implicit_conversion(type_b, value_a, state)) {
    _mesa_glsl_error(loc, state,
                     "could not implicitly convert operands to "
                     "modulus (%%) operator");
    return glsl_type::error_type;
 }
 type_a = value_a->type;
 type_b = value_b->type;

 /*    "The operands cannot be vectors of differing size. If one operand is
  *    a scalar and the other vector, then the scalar is applied component-
  *    wise to the vector, resulting in the same type as the vector. If both
  *    are vectors of the same size, the result is computed component-wise."
  */
 if (type_a->is_vector()) {
    if (!type_b->is_vector()
        || (type_a->vector_elements == type_b->vector_elements))
    return type_a;
 } else
    return type_b;

 /*    "The operator modulus (%) is not defined for any other data types
  *    (non-integer types)."
  */
 _mesa_glsl_error(loc, state, "type mismatch");
 return glsl_type::error_type;
683}


686static const struct glsl_type *
687relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
                     struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
689{
 const glsl_type *type_a = value_a->type;
 const glsl_type *type_b = value_b->type;

 /* From GLSL 1.50 spec, page 56:
  *    "The relational operators greater than (>), less than (<), greater
  *    than or equal (>=), and less than or equal (<=) operate only on
  *    scalar integer and scalar floating-point expressions."
  */
 if (!type_a->is_numeric()
     || !type_b->is_numeric()
     || !type_a->is_scalar()
     || !type_b->is_scalar()) {
    _mesa_glsl_error(loc, state,
                     "operands to relational operators must be scalar and "
                     "numeric");
    return glsl_type::error_type;
 }

 /*    "Either the operands' types must match, or the conversions from
  *    Section 4.1.10 "Implicit Conversions" will be applied to the integer
  *    operand, after which the types must match."
  */
 if (!apply_implicit_conversion(type_a, value_b, state)
     && !apply_implicit_conversion(type_b, value_a, state)) {
    _mesa_glsl_error(loc, state,
                     "could not implicitly convert operands to "
                     "relational operator");
    return glsl_type::error_type;
 }
 type_a = value_a->type;
 type_b = value_b->type;

 if (type_a->base_type != type_b->base_type) {
    _mesa_glsl_error(loc, state, "base type mismatch");
    return glsl_type::error_type;
 }

 /*    "The result is scalar Boolean."
  */
 return glsl_type::bool_type;
730}

732/**
* \brief Return the result type of a bit-shift operation.
*
* If the given types to the bit-shift operator are invalid, return
* glsl_type::error_type.
*
* \param type_a Type of LHS of bit-shift op
* \param type_b Type of RHS of bit-shift op
*/
741static const struct glsl_type *
742shift_result_type(const struct glsl_type *type_a,
                const struct glsl_type *type_b,
                ast_operators op,
                struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
746{
 if (!state->check_bitwise_operations_allowed(loc)) {
    return glsl_type::error_type;
 }

 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
  *
  *     "The shift operators (<<) and (>>). For both operators, the operands
  *     must be signed or unsigned integers or integer vectors. One operand
  *     can be signed while the other is unsigned."
  */
 if (!type_a->is_integer_32_64()) {
    _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
                     "integer vector", ast_expression::operator_string(op));
   return glsl_type::error_type;

 }
 if (!type_b->is_integer_32()) {
    _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
                     "integer vector", ast_expression::operator_string(op));
   return glsl_type::error_type;
 }

 /*     "If the first operand is a scalar, the second operand has to be
  *     a scalar as well."
  */
 if (type_a->is_scalar() && !type_b->is_scalar()) {
    _mesa_glsl_error(loc, state, "if the first operand of %s is scalar, the "
                     "second must be scalar as well",
                     ast_expression::operator_string(op));
   return glsl_type::error_type;
 }

 /* If both operands are vectors, check that they have same number of
  * elements.
  */
 if (type_a->is_vector() &&
    type_b->is_vector() &&
    type_a->vector_elements != type_b->vector_elements) {
    _mesa_glsl_error(loc, state, "vector operands to operator %s must "
                     "have same number of elements",
                     ast_expression::operator_string(op));
   return glsl_type::error_type;
 }

 /*     "In all cases, the resulting type will be the same type as the left
  *     operand."
  */
 return type_a;
795}

797/**
* Returns the innermost array index expression in an rvalue tree.
* This is the largest indexing level -- if an array of blocks, then
* it is the block index rather than an indexing expression for an
* array-typed member of an array of blocks.
*/
803static ir_rvalue *
804find_innermost_array_index(ir_rvalue *rv)
805{
 ir_dereference_array *last = NULL__null;
 while (rv) {
    if (rv->as_dereference_array()) {
       last = rv->as_dereference_array();
       rv = last->array;
    } else if (rv->as_dereference_record())
       rv = rv->as_dereference_record()->record;
    else if (rv->as_swizzle())
       rv = rv->as_swizzle()->val;
    else
       rv = NULL__null;
 }

 if (last)
    return last->array_index;

 return NULL__null;
823}

825/**
* Validates that a value can be assigned to a location with a specified type
*
* Validates that \c rhs can be assigned to some location.  If the types are
* not an exact match but an automatic conversion is possible, \c rhs will be
* converted.
*
* \return
* \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
* Otherwise the actual RHS to be assigned will be returned.  This may be
* \c rhs, or it may be \c rhs after some type conversion.
*
* \note
* In addition to being used for assignments, this function is used to
* type-check return values.
*/
841static ir_rvalue *
842validate_assignment(struct _mesa_glsl_parse_state *state,
                  YYLTYPE loc, ir_rvalue *lhs,
                  ir_rvalue *rhs, bool is_initializer)
845{
 /* If there is already some error in the RHS, just return it.  Anything
  * else will lead to an avalanche of error message back to the user.
  */
 if (rhs->type->is_error())
    return rhs;

 /* In the Tessellation Control Shader:
  * If a per-vertex output variable is used as an l-value, it is an error
  * if the expression indicating the vertex number is not the identifier
  * `gl_InvocationID`.
  */
 if (state->stage == MESA_SHADER_TESS_CTRL && !lhs->type->is_error()) {
    ir_variable *var = lhs->variable_referenced();
    if (var && var->data.mode == ir_var_shader_out && !var->data.patch) {
       ir_rvalue *index = find_innermost_array_index(lhs);
       ir_variable *index_var = index ? index->variable_referenced() : NULL__null;
       if (!index_var || strcmp(index_var->name, "gl_InvocationID") != 0) {
          _mesa_glsl_error(&loc, state,
                           "Tessellation control shader outputs can only "
                           "be indexed by gl_InvocationID");
          return NULL__null;
       }
    }
 }

 /* If the types are identical, the assignment can trivially proceed.
  */
 if (rhs->type == lhs->type)
    return rhs;

 /* If the array element types are the same and the LHS is unsized,
  * the assignment is okay for initializers embedded in variable
  * declarations.
  *
  * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
  * is handled by ir_dereference::is_lvalue.
  */
 const glsl_type *lhs_t = lhs->type;
 const glsl_type *rhs_t = rhs->type;
 bool unsized_array = false;
 while(lhs_t->is_array()) {
    if (rhs_t == lhs_t)
       break; /* the rest of the inner arrays match so break out early */
    if (!rhs_t->is_array()) {
       unsized_array = false;
       break; /* number of dimensions mismatch */
    }
    if (lhs_t->length == rhs_t->length) {
       lhs_t = lhs_t->fields.array;
       rhs_t = rhs_t->fields.array;
       continue;
    } else if (lhs_t->is_unsized_array()) {
       unsized_array = true;
    } else {
       unsized_array = false;
       break; /* sized array mismatch */
    }
    lhs_t = lhs_t->fields.array;
    rhs_t = rhs_t->fields.array;
 }
 if (unsized_array) {
    if (is_initializer) {
       if (rhs->type->get_scalar_type() == lhs->type->get_scalar_type())
          return rhs;
    } else {
       _mesa_glsl_error(&loc, state,
                        "implicitly sized arrays cannot be assigned");
       return NULL__null;
    }
 }

 /* Check for implicit conversion in GLSL 1.20 */
 if (apply_implicit_conversion(lhs->type, rhs, state)) {
    if (rhs->type == lhs->type)
       return rhs;
 }

 _mesa_glsl_error(&loc, state,
                  "%s of type %s cannot be assigned to "
                  "variable of type %s",
                  is_initializer ? "initializer" : "value",
                  rhs->type->name, lhs->type->name);

 return NULL__null;
930}

932static void
933mark_whole_array_access(ir_rvalue *access)
934{
 ir_dereference_variable *deref = access->as_dereference_variable();

 if (deref && deref->var) {
    deref->var->data.max_array_access = deref->type->length - 1;
 }
940}

942static bool
943do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
            const char *non_lvalue_description,
            ir_rvalue *lhs, ir_rvalue *rhs,
            ir_rvalue **out_rvalue, bool needs_rvalue,
            bool is_initializer,
            YYLTYPE lhs_loc)
949{
 void *ctx = state;
 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());

 ir_variable *lhs_var = lhs->variable_referenced();
 if (lhs_var)
    lhs_var->data.assigned = true;

 if (!error_emitted) {
    if (non_lvalue_description != NULL__null) {
       _mesa_glsl_error(&lhs_loc, state,
                        "assignment to %s",
                        non_lvalue_description);
       error_emitted = true;
    } else if (lhs_var != NULL__null && (lhs_var->data.read_only ||
               (lhs_var->data.mode == ir_var_shader_storage &&
                lhs_var->data.memory_read_only))) {
       /* We can have memory_read_only set on both images and buffer variables,
        * but in the former there is a distinction between assignments to
        * the variable itself (read_only) and to the memory they point to
        * (memory_read_only), while in the case of buffer variables there is
        * no such distinction, that is why this check here is limited to
        * buffer variables alone.
        */
       _mesa_glsl_error(&lhs_loc, state,
                        "assignment to read-only variable '%s'",
                        lhs_var->name);
       error_emitted = true;
    } else if (lhs->type->is_array() &&
               !state->check_version(120, 300, &lhs_loc,
                                     "whole array assignment forbidden")) {
       /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
        *
        *    "Other binary or unary expressions, non-dereferenced
        *     arrays, function names, swizzles with repeated fields,
        *     and constants cannot be l-values."
        *
        * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
        */
       error_emitted = true;
    } else if (!lhs->is_lvalue(state)) {
       _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
       error_emitted = true;
    }
 }

 ir_rvalue *new_rhs =
    validate_assignment(state, lhs_loc, lhs, rhs, is_initializer);
 if (new_rhs != NULL__null) {
    rhs = new_rhs;

    /* If the LHS array was not declared with a size, it takes it size from
     * the RHS.  If the LHS is an l-value and a whole array, it must be a
     * dereference of a variable.  Any other case would require that the LHS
     * is either not an l-value or not a whole array.
     */
    if (lhs->type->is_unsized_array()) {
       ir_dereference *const d = lhs->as_dereference();

       assert(d != NULL)(static_cast <bool> (d != __null) ? void (0) : __assert_fail
 ("d != NULL", __builtin_FILE (), __builtin_LINE (), __extension__
 __PRETTY_FUNCTION__));

       ir_variable *const var = d->variable_referenced();

       assert(var != NULL)(static_cast <bool> (var != __null) ? void (0) : __assert_fail
 ("var != NULL", __builtin_FILE (), __builtin_LINE (), __extension__
 __PRETTY_FUNCTION__));

       if (var->data.max_array_access >= rhs->type->array_size()) {
          /* FINISHME: This should actually log the location of the RHS. */
          _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
                           "previous access",
                           var->data.max_array_access);
       }

       var->type = glsl_type::get_array_instance(lhs->type->fields.array,
                                                 rhs->type->array_size());
       d->type = var->type;
    }
    if (lhs->type->is_array()) {
       mark_whole_array_access(rhs);
       mark_whole_array_access(lhs);
    }
 } else {
   error_emitted = true;
 }

 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
  * but not post_inc) need the converted assigned value as an rvalue
  * to handle things like:
  *
  * i = j += 1;
  */
 if (needs_rvalue) {
    ir_rvalue *rvalue;
    if (!error_emitted) {
       ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
                                               ir_var_temporary);
       instructions->push_tail(var);
       instructions->push_tail(assign(var, rhs));

       ir_dereference_variable *deref_var =
          new(ctx) ir_dereference_variable(var);
       instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var));
       rvalue = new(ctx) ir_dereference_variable(var);
    } else {
       rvalue = ir_rvalue::error_value(ctx);
    }
    *out_rvalue = rvalue;
 } else {
    if (!error_emitted)
       instructions->push_tail(new(ctx) ir_assignment(lhs, rhs));
    *out_rvalue = NULL__null;
 }

 return error_emitted;
1062}

1064static ir_rvalue *
1065get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
1066{
 void *ctx = ralloc_parent(lvalue);
 ir_variable *var;

 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
                            ir_var_temporary);
 instructions->push_tail(var);

 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
                                                lvalue));

 return new(ctx) ir_dereference_variable(var);
1078}


1081ir_rvalue *
1082ast_node::hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
1083{
 (void) instructions;
 (void) state;

 return NULL__null;
1088}

1090bool
1091ast_node::has_sequence_subexpression() const
1092{
 return false;
1094}

1096void
1097ast_node::set_is_lhs(bool /* new_value */)
1098{
1099}

1101void
1102ast_function_expression::hir_no_rvalue(exec_list *instructions,
                                     struct _mesa_glsl_parse_state *state)
1104{
 (void)hir(instructions, state);
1106}

1108void
1109ast_aggregate_initializer::hir_no_rvalue(exec_list *instructions,
                                       struct _mesa_glsl_parse_state *state)
1111{
 (void)hir(instructions, state);
1113}

1115static ir_rvalue *
1116do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
1117{
 int join_op;
 ir_rvalue *cmp = NULL__null;

 if (operation == ir_binop_all_equal)
    join_op = ir_binop_logic_and;
 else
    join_op = ir_binop_logic_or;

 switch (op0->type->base_type) {
 case GLSL_TYPE_FLOAT:
 case GLSL_TYPE_FLOAT16:
 case GLSL_TYPE_UINT:
 case GLSL_TYPE_INT:
 case GLSL_TYPE_BOOL:
 case GLSL_TYPE_DOUBLE:
 case GLSL_TYPE_UINT64:
 case GLSL_TYPE_INT64:
 case GLSL_TYPE_UINT16:
 case GLSL_TYPE_INT16:
 case GLSL_TYPE_UINT8:
 case GLSL_TYPE_INT8:
    return new(mem_ctx) ir_expression(operation, op0, op1);

 case GLSL_TYPE_ARRAY: {
    for (unsigned int i = 0; i < op0->type->length; i++) {
       ir_rvalue *e0, *e1, *result;

       e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL__null),
                                              new(mem_ctx) ir_constant(i));
       e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL__null),
                                              new(mem_ctx) ir_constant(i));
       result = do_comparison(mem_ctx, operation, e0, e1);

       if (cmp) {
          cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
       } else {
          cmp = result;
       }
    }

    mark_whole_array_access(op0);
    mark_whole_array_access(op1);
    break;
 }

 case GLSL_TYPE_STRUCT: {
    for (unsigned int i = 0; i < op0->type->length; i++) {
       ir_rvalue *e0, *e1, *result;
       const char *field_name = op0->type->fields.structure[i].name;

       e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL__null),
                                               field_name);
       e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL__null),
                                               field_name);
       result = do_comparison(mem_ctx, operation, e0, e1);

       if (cmp) {
          cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
       } else {
          cmp = result;
       }
    }
    break;
 }

 case GLSL_TYPE_ERROR:
 case GLSL_TYPE_VOID:
 case GLSL_TYPE_SAMPLER:
 case GLSL_TYPE_IMAGE:
 case GLSL_TYPE_INTERFACE:
 case GLSL_TYPE_ATOMIC_UINT:
 case GLSL_TYPE_SUBROUTINE:
 case GLSL_TYPE_FUNCTION:
    /* I assume a comparison of a struct containing a sampler just
     * ignores the sampler present in the type.
     */
    break;
 }

 if (cmp == NULL__null)
    cmp = new(mem_ctx) ir_constant(true);

 return cmp;
1201}

1203/* For logical operations, we want to ensure that the operands are
* scalar booleans.  If it isn't, emit an error and return a constant
* boolean to avoid triggering cascading error messages.
*/
1207static ir_rvalue *
1208get_scalar_boolean_operand(exec_list *instructions,
                         struct _mesa_glsl_parse_state *state,
                         ast_expression *parent_expr,
                         int operand,
                         const char *operand_name,
                         bool *error_emitted)
1214{
 ast_expression *expr = parent_expr->subexpressions[operand];
 void *ctx = state;
 ir_rvalue *val = expr->hir(instructions, state);

 if (val->type->is_boolean() && val->type->is_scalar())
    return val;

 if (!*error_emitted) {
    YYLTYPE loc = expr->get_location();
    _mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean",
                     operand_name,
                     parent_expr->operator_string(parent_expr->oper));
    *error_emitted = true;
 }

 return new(ctx) ir_constant(true);
1231}

1233/**
* If name refers to a builtin array whose maximum allowed size is less than
* size, report an error and return true.  Otherwise return false.
*/
1237void
1238check_builtin_array_max_size(const char *name, unsigned size,
                           YYLTYPE loc, struct _mesa_glsl_parse_state *state)
1240{
 if ((strcmp("gl_TexCoord", name) == 0)
     && (size > state->Const.MaxTextureCoords)) {
    /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
     *
     *     "The size [of gl_TexCoord] can be at most
     *     gl_MaxTextureCoords."
     */
    _mesa_glsl_error(&loc, state, "`gl_TexCoord' array size cannot "
                     "be larger than gl_MaxTextureCoords (%u)",
                     state->Const.MaxTextureCoords);
 } else if (strcmp("gl_ClipDistance", name) == 0) {
    state->clip_dist_size = size;
    if (size + state->cull_dist_size > state->Const.MaxClipPlanes) {
       /* From section 7.1 (Vertex Shader Special Variables) of the
        * GLSL 1.30 spec:
        *
        *   "The gl_ClipDistance array is predeclared as unsized and
        *   must be sized by the shader either redeclaring it with a
        *   size or indexing it only with integral constant
        *   expressions. ... The size can be at most
        *   gl_MaxClipDistances."
        */
       _mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
                        "be larger than gl_MaxClipDistances (%u)",
                        state->Const.MaxClipPlanes);
    }
 } else if (strcmp("gl_CullDistance", name) == 0) {
    state->cull_dist_size = size;
    if (size + state->clip_dist_size > state->Const.MaxClipPlanes) {
       /* From the ARB_cull_distance spec:
        *
        *   "The gl_CullDistance array is predeclared as unsized and
        *    must be sized by the shader either redeclaring it with
        *    a size or indexing it only with integral constant
        *    expressions. The size determines the number and set of
        *    enabled cull distances and can be at most
        *    gl_MaxCullDistances."
        */
       _mesa_glsl_error(&loc, state, "`gl_CullDistance' array size cannot "
                        "be larger than gl_MaxCullDistances (%u)",
                        state->Const.MaxClipPlanes);
    }
 }
1284}

1286/**
* Create the constant 1, of a which is appropriate for incrementing and
* decrementing values of the given GLSL type.  For example, if type is vec4,
* this creates a constant value of 1.0 having type float.
*
* If the given type is invalid for increment and decrement operators, return
* a floating point 1--the error will be detected later.
*/
1294static ir_rvalue *
1295constant_one_for_inc_dec(void *ctx, const glsl_type *type)
1296{
 switch (type->base_type) {
 case GLSL_TYPE_UINT:
    return new(ctx) ir_constant((unsigned) 1);
 case GLSL_TYPE_INT:
    return new(ctx) ir_constant(1);
 case GLSL_TYPE_UINT64:
    return new(ctx) ir_constant((uint64_t) 1);
 case GLSL_TYPE_INT64:
    return new(ctx) ir_constant((int64_t) 1);
 default:
 case GLSL_TYPE_FLOAT:
    return new(ctx) ir_constant(1.0f);
 }
1310}

1312ir_rvalue *
1313ast_expression::hir(exec_list *instructions,
                  struct _mesa_glsl_parse_state *state)
1315{
 return do_hir(instructions, state, true);
1317}

1319void
1320ast_expression::hir_no_rvalue(exec_list *instructions,
                            struct _mesa_glsl_parse_state *state)
1322{
 do_hir(instructions, state, false);
1324}

1326void
1327ast_expression::set_is_lhs(bool new_value)
1328{
 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
  * if we lack an identifier we can just skip it.
  */
 if (this->primary_expression.identifier == NULL__null)
    return;

 this->is_lhs = new_value;

 /* We need to go through the subexpressions tree to cover cases like
  * ast_field_selection
  */
 if (this->subexpressions[0] != NULL__null)
    this->subexpressions[0]->set_is_lhs(new_value);
1342}

1344ir_rvalue *
1345ast_expression::do_hir(exec_list *instructions,
                     struct _mesa_glsl_parse_state *state,
                     bool needs_rvalue)
1348{
 void *ctx = state;
 static const int operations[AST_NUM_OPERATORS(ast_aggregate + 1)] = {
    -1,               /* ast_assign doesn't convert to ir_expression. */
    -1,               /* ast_plus doesn't convert to ir_expression. */
    ir_unop_neg,
    ir_binop_add,
    ir_binop_sub,
    ir_binop_mul,
    ir_binop_div,
    ir_binop_mod,
    ir_binop_lshift,
    ir_binop_rshift,
    ir_binop_less,
    ir_binop_less,    /* This is correct.  See the ast_greater case below. */
    ir_binop_gequal,  /* This is correct.  See the ast_lequal case below. */
    ir_binop_gequal,
    ir_binop_all_equal,
    ir_binop_any_nequal,
    ir_binop_bit_and,
    ir_binop_bit_xor,
    ir_binop_bit_or,
    ir_unop_bit_not,
    ir_binop_logic_and,
    ir_binop_logic_xor,
    ir_binop_logic_or,
    ir_unop_logic_not,

    /* Note: The following block of expression types actually convert
     * to multiple IR instructions.
     */
    ir_binop_mul,     /* ast_mul_assign */
    ir_binop_div,     /* ast_div_assign */
    ir_binop_mod,     /* ast_mod_assign */
    ir_binop_add,     /* ast_add_assign */
    ir_binop_sub,     /* ast_sub_assign */
    ir_binop_lshift,  /* ast_ls_assign */
    ir_binop_rshift,  /* ast_rs_assign */
    ir_binop_bit_and, /* ast_and_assign */
    ir_binop_bit_xor, /* ast_xor_assign */
    ir_binop_bit_or,  /* ast_or_assign */

    -1,               /* ast_conditional doesn't convert to ir_expression. */
    ir_binop_add,     /* ast_pre_inc. */
    ir_binop_sub,     /* ast_pre_dec. */
    ir_binop_add,     /* ast_post_inc. */
    ir_binop_sub,     /* ast_post_dec. */
    -1,               /* ast_field_selection doesn't conv to ir_expression. */
    -1,               /* ast_array_index doesn't convert to ir_expression. */
    -1,               /* ast_function_call doesn't conv to ir_expression. */
    -1,               /* ast_identifier doesn't convert to ir_expression. */
    -1,               /* ast_int_constant doesn't convert to ir_expression. */
    -1,               /* ast_uint_constant doesn't conv to ir_expression. */
    -1,               /* ast_float_constant doesn't conv to ir_expression. */
    -1,               /* ast_bool_constant doesn't conv to ir_expression. */
    -1,               /* ast_sequence doesn't convert to ir_expression. */
    -1,               /* ast_aggregate shouldn't ever even get here. */
 };
 ir_rvalue *result = NULL__null;
 ir_rvalue *op[3];
 const struct glsl_type *type, *orig_type;
 bool error_emitted = false;
 YYLTYPE loc;

 loc = this->get_location();

 switch (this->oper) {
 case ast_aggregate:
    unreachable("ast_aggregate: Should never get here.")do { (static_cast <bool> (!"ast_aggregate: Should never get here."
) ? void (0) : __assert_fail ("!\"ast_aggregate: Should never get here.\""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
)); __builtin_unreachable(); } while (0);

 case ast_assign: {
    this->subexpressions[0]->set_is_lhs(true);
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);

    error_emitted =
       do_assignment(instructions, state,
                     this->subexpressions[0]->non_lvalue_description,
                     op[0], op[1], &result, needs_rvalue, false,
                     this->subexpressions[0]->get_location());
    break;
 }

 case ast_plus:
    op[0] = this->subexpressions[0]->hir(instructions, state);

    type = unary_arithmetic_result_type(op[0]->type, state, & loc);

    error_emitted = type->is_error();

    result = op[0];
    break;

 case ast_neg:
    op[0] = this->subexpressions[0]->hir(instructions, state);

    type = unary_arithmetic_result_type(op[0]->type, state, & loc);

    error_emitted = type->is_error();

    result = new(ctx) ir_expression(operations[this->oper], type,
                                    op[0], NULL__null);
    break;

 case ast_add:
 case ast_sub:
 case ast_mul:
 case ast_div:
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);

    type = arithmetic_result_type(op[0], op[1],
                                  (this->oper == ast_mul),
                                  state, & loc);
    error_emitted = type->is_error();

    result = new(ctx) ir_expression(operations[this->oper], type,
                                    op[0], op[1]);
    break;

 case ast_mod:
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);

    type = modulus_result_type(op[0], op[1], state, &loc);

    assert(operations[this->oper] == ir_binop_mod)(static_cast <bool> (operations[this->oper] == ir_binop_mod
) ? void (0) : __assert_fail ("operations[this->oper] == ir_binop_mod"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

    result = new(ctx) ir_expression(operations[this->oper], type,
                                    op[0], op[1]);
    error_emitted = type->is_error();
    break;

 case ast_lshift:
 case ast_rshift:
     if (!state->check_bitwise_operations_allowed(&loc)) {
        error_emitted = true;
     }

     op[0] = this->subexpressions[0]->hir(instructions, state);
     op[1] = this->subexpressions[1]->hir(instructions, state);
     type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
                              &loc);
     result = new(ctx) ir_expression(operations[this->oper], type,
                                     op[0], op[1]);
     error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
     break;

 case ast_less:
 case ast_greater:
 case ast_lequal:
 case ast_gequal:
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);

    type = relational_result_type(op[0], op[1], state, & loc);

    /* The relational operators must either generate an error or result
     * in a scalar boolean.  See page 57 of the GLSL 1.50 spec.
     */
    assert(type->is_error()(static_cast <bool> (type->is_error() || (type->is_boolean
() && type->is_scalar())) ? void (0) : __assert_fail
 ("type->is_error() || (type->is_boolean() && type->is_scalar())"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
))
           || (type->is_boolean() && type->is_scalar()))(static_cast <bool> (type->is_error() || (type->is_boolean
() && type->is_scalar())) ? void (0) : __assert_fail
 ("type->is_error() || (type->is_boolean() && type->is_scalar())"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

    /* Like NIR, GLSL IR does not have opcodes for > or <=.  Instead, swap
     * the arguments and use < or >=.
     */
    if (this->oper == ast_greater || this->oper == ast_lequal) {
       ir_rvalue *const tmp = op[0];
       op[0] = op[1];
       op[1] = tmp;
    }

    result = new(ctx) ir_expression(operations[this->oper], type,
                                    op[0], op[1]);
    error_emitted = type->is_error();
    break;

 case ast_nequal:
 case ast_equal:
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);

    /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
     *
     *    "The equality operators equal (==), and not equal (!=)
     *    operate on all types. They result in a scalar Boolean. If
     *    the operand types do not match, then there must be a
     *    conversion from Section 4.1.10 "Implicit Conversions"
     *    applied to one operand that can make them match, in which
     *    case this conversion is done."
     */

    if (op[0]->type == glsl_type::void_type || op[1]->type == glsl_type::void_type) {
       _mesa_glsl_error(& loc, state, "`%s':  wrong operand types: "
                       "no operation `%1$s' exists that takes a left-hand "
                       "operand of type 'void' or a right operand of type "
                       "'void'", (this->oper == ast_equal) ? "==" : "!=");
       error_emitted = true;
    } else if ((!apply_implicit_conversion(op[0]->type, op[1], state)
         && !apply_implicit_conversion(op[1]->type, op[0], state))
        || (op[0]->type != op[1]->type)) {
       _mesa_glsl_error(& loc, state, "operands of `%s' must have the same "
                        "type", (this->oper == ast_equal) ? "==" : "!=");
       error_emitted = true;
    } else if ((op[0]->type->is_array() || op[1]->type->is_array()) &&
               !state->check_version(120, 300, &loc,
                                     "array comparisons forbidden")) {
       error_emitted = true;
    } else if ((op[0]->type->contains_subroutine() ||
                op[1]->type->contains_subroutine())) {
       _mesa_glsl_error(&loc, state, "subroutine comparisons forbidden");
       error_emitted = true;
    } else if ((op[0]->type->contains_opaque() ||
                op[1]->type->contains_opaque())) {
       _mesa_glsl_error(&loc, state, "opaque type comparisons forbidden");
       error_emitted = true;
    }

    if (error_emitted) {
       result = new(ctx) ir_constant(false);
    } else {
       result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
       assert(result->type == glsl_type::bool_type)(static_cast <bool> (result->type == glsl_type::bool_type
) ? void (0) : __assert_fail ("result->type == glsl_type::bool_type"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
    }
    break;

 case ast_bit_and:
 case ast_bit_xor:
 case ast_bit_or:
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);
    type = bit_logic_result_type(op[0], op[1], this->oper, state, &loc);
    result = new(ctx) ir_expression(operations[this->oper], type,
                                    op[0], op[1]);
    error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
    break;

 case ast_bit_not:
    op[0] = this->subexpressions[0]->hir(instructions, state);

    if (!state->check_bitwise_operations_allowed(&loc)) {
       error_emitted = true;
    }

    if (!op[0]->type->is_integer_32_64()) {
       _mesa_glsl_error(&loc, state, "operand of `~' must be an integer");
       error_emitted = true;
    }

    type = error_emitted ? glsl_type::error_type : op[0]->type;
    result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL__null);
    break;

 case ast_logic_and: {
    exec_list rhs_instructions;
    op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
                                       "LHS", &error_emitted);
    op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
                                       "RHS", &error_emitted);

    if (rhs_instructions.is_empty()) {
       result = new(ctx) ir_expression(ir_binop_logic_and, op[0], op[1]);
    } else {
       ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
                                                     "and_tmp",
                                                     ir_var_temporary);
       instructions->push_tail(tmp);

       ir_if *const stmt = new(ctx) ir_if(op[0]);
       instructions->push_tail(stmt);

       stmt->then_instructions.append_list(&rhs_instructions);
       ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
       ir_assignment *const then_assign =
          new(ctx) ir_assignment(then_deref, op[1]);
       stmt->then_instructions.push_tail(then_assign);

       ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
       ir_assignment *const else_assign =
          new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false));
       stmt->else_instructions.push_tail(else_assign);

       result = new(ctx) ir_dereference_variable(tmp);
    }
    break;
 }

 case ast_logic_or: {
    exec_list rhs_instructions;
    op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
                                       "LHS", &error_emitted);
    op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
                                       "RHS", &error_emitted);

    if (rhs_instructions.is_empty()) {
       result = new(ctx) ir_expression(ir_binop_logic_or, op[0], op[1]);
    } else {
       ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
                                                     "or_tmp",
                                                     ir_var_temporary);
       instructions->push_tail(tmp);

       ir_if *const stmt = new(ctx) ir_if(op[0]);
       instructions->push_tail(stmt);

       ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
       ir_assignment *const then_assign =
          new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true));
       stmt->then_instructions.push_tail(then_assign);

       stmt->else_instructions.append_list(&rhs_instructions);
       ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
       ir_assignment *const else_assign =
          new(ctx) ir_assignment(else_deref, op[1]);
       stmt->else_instructions.push_tail(else_assign);

       result = new(ctx) ir_dereference_variable(tmp);
    }
    break;
 }

 case ast_logic_xor:
    /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
     *
     *    "The logical binary operators and (&&), or ( | | ), and
     *     exclusive or (^^). They operate only on two Boolean
     *     expressions and result in a Boolean expression."
     */
    op[0] = get_scalar_boolean_operand(instructions, state, this, 0, "LHS",
                                       &error_emitted);
    op[1] = get_scalar_boolean_operand(instructions, state, this, 1, "RHS",
                                       &error_emitted);

    result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
                                    op[0], op[1]);
    break;

 case ast_logic_not:
    op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
                                       "operand", &error_emitted);

    result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
                                    op[0], NULL__null);
    break;

 case ast_mul_assign:
 case ast_div_assign:
 case ast_add_assign:
 case ast_sub_assign: {
    this->subexpressions[0]->set_is_lhs(true);
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);

    orig_type = op[0]->type;

    /* Break out if operand types were not parsed successfully. */
    if ((op[0]->type == glsl_type::error_type ||
         op[1]->type == glsl_type::error_type)) {
       error_emitted = true;
       break;
    }

    type = arithmetic_result_type(op[0], op[1],
                                  (this->oper == ast_mul_assign),
                                  state, & loc);

    if (type != orig_type) {
       _mesa_glsl_error(& loc, state,
                        "could not implicitly convert "
                        "%s to %s", type->name, orig_type->name);
       type = glsl_type::error_type;
    }

    ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
                                                 op[0], op[1]);

    error_emitted =
       do_assignment(instructions, state,
                     this->subexpressions[0]->non_lvalue_description,
                     op[0]->clone(ctx, NULL__null), temp_rhs,
                     &result, needs_rvalue, false,
                     this->subexpressions[0]->get_location());

    /* GLSL 1.10 does not allow array assignment.  However, we don't have to
     * explicitly test for this because none of the binary expression
     * operators allow array operands either.
     */

    break;
 }

 case ast_mod_assign: {
    this->subexpressions[0]->set_is_lhs(true);
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);

    orig_type = op[0]->type;
    type = modulus_result_type(op[0], op[1], state, &loc);

    if (type != orig_type) {
       _mesa_glsl_error(& loc, state,
                        "could not implicitly convert "
                        "%s to %s", type->name, orig_type->name);
       type = glsl_type::error_type;
    }

    assert(operations[this->oper] == ir_binop_mod)(static_cast <bool> (operations[this->oper] == ir_binop_mod
) ? void (0) : __assert_fail ("operations[this->oper] == ir_binop_mod"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

    ir_rvalue *temp_rhs;
    temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
                                      op[0], op[1]);

    error_emitted =
       do_assignment(instructions, state,
                     this->subexpressions[0]->non_lvalue_description,
                     op[0]->clone(ctx, NULL__null), temp_rhs,
                     &result, needs_rvalue, false,
                     this->subexpressions[0]->get_location());
    break;
 }

 case ast_ls_assign:
 case ast_rs_assign: {
    this->subexpressions[0]->set_is_lhs(true);
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);
    type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
                             &loc);
    ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
                                                 type, op[0], op[1]);
    error_emitted =
       do_assignment(instructions, state,
                     this->subexpressions[0]->non_lvalue_description,
                     op[0]->clone(ctx, NULL__null), temp_rhs,
                     &result, needs_rvalue, false,
                     this->subexpressions[0]->get_location());
    break;
 }

 case ast_and_assign:
 case ast_xor_assign:
 case ast_or_assign: {
    this->subexpressions[0]->set_is_lhs(true);
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = this->subexpressions[1]->hir(instructions, state);

    orig_type = op[0]->type;
    type = bit_logic_result_type(op[0], op[1], this->oper, state, &loc);

    if (type != orig_type) {
       _mesa_glsl_error(& loc, state,
                        "could not implicitly convert "
                        "%s to %s", type->name, orig_type->name);
       type = glsl_type::error_type;
    }

    ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
                                                 type, op[0], op[1]);
    error_emitted =
       do_assignment(instructions, state,
                     this->subexpressions[0]->non_lvalue_description,
                     op[0]->clone(ctx, NULL__null), temp_rhs,
                     &result, needs_rvalue, false,
                     this->subexpressions[0]->get_location());
    break;
 }

 case ast_conditional: {
    /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
     *
     *    "The ternary selection operator (?:). It operates on three
     *    expressions (exp1 ? exp2 : exp3). This operator evaluates the
     *    first expression, which must result in a scalar Boolean."
     */
    op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
                                       "condition", &error_emitted);

    /* The :? operator is implemented by generating an anonymous temporary
     * followed by an if-statement.  The last instruction in each branch of
     * the if-statement assigns a value to the anonymous temporary.  This
     * temporary is the r-value of the expression.
     */
    exec_list then_instructions;
    exec_list else_instructions;

    op[1] = this->subexpressions[1]->hir(&then_instructions, state);
    op[2] = this->subexpressions[2]->hir(&else_instructions, state);

    /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
     *
     *     "The second and third expressions can be any type, as
     *     long their types match, or there is a conversion in
     *     Section 4.1.10 "Implicit Conversions" that can be applied
     *     to one of the expressions to make their types match. This
     *     resulting matching type is the type of the entire
     *     expression."
     */
    if ((!apply_implicit_conversion(op[1]->type, op[2], state)
        && !apply_implicit_conversion(op[2]->type, op[1], state))
        || (op[1]->type != op[2]->type)) {
       YYLTYPE loc = this->subexpressions[1]->get_location();

       _mesa_glsl_error(& loc, state, "second and third operands of ?: "
                        "operator must have matching types");
       error_emitted = true;
       type = glsl_type::error_type;
    } else {
       type = op[1]->type;
    }

    /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
     *
     *    "The second and third expressions must be the same type, but can
     *    be of any type other than an array."
     */
    if (type->is_array() &&
        !state->check_version(120, 300, &loc,
                              "second and third operands of ?: operator "
                              "cannot be arrays")) {
       error_emitted = true;
    }

    /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
     *
     *  "Except for array indexing, structure member selection, and
     *   parentheses, opaque variables are not allowed to be operands in
     *   expressions; such use results in a compile-time error."
     */
    if (type->contains_opaque()) {
       if (!(state->has_bindless() && (type->is_image() || type->is_sampler()))) {
          _mesa_glsl_error(&loc, state, "variables of type %s cannot be "
                           "operands of the ?: operator", type->name);
          error_emitted = true;
       }
    }

    ir_constant *cond_val = op[0]->constant_expression_value(ctx);

    if (then_instructions.is_empty()
        && else_instructions.is_empty()
        && cond_val != NULL__null) {
       result = cond_val->value.b[0] ? op[1] : op[2];
    } else {
       /* The copy to conditional_tmp reads the whole array. */
       if (type->is_array()) {
          mark_whole_array_access(op[1]);
          mark_whole_array_access(op[2]);
       }

       ir_variable *const tmp =
          new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary);
       instructions->push_tail(tmp);

       ir_if *const stmt = new(ctx) ir_if(op[0]);
       instructions->push_tail(stmt);

       then_instructions.move_nodes_to(& stmt->then_instructions);
       ir_dereference *const then_deref =
          new(ctx) ir_dereference_variable(tmp);
       ir_assignment *const then_assign =
          new(ctx) ir_assignment(then_deref, op[1]);
       stmt->then_instructions.push_tail(then_assign);

       else_instructions.move_nodes_to(& stmt->else_instructions);
       ir_dereference *const else_deref =
          new(ctx) ir_dereference_variable(tmp);
       ir_assignment *const else_assign =
          new(ctx) ir_assignment(else_deref, op[2]);
       stmt->else_instructions.push_tail(else_assign);

       result = new(ctx) ir_dereference_variable(tmp);
    }
    break;
 }

 case ast_pre_inc:
 case ast_pre_dec: {
    this->non_lvalue_description = (this->oper == ast_pre_inc)
       ? "pre-increment operation" : "pre-decrement operation";

    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = constant_one_for_inc_dec(ctx, op[0]->type);

    type = arithmetic_result_type(op[0], op[1], false, state, & loc);

    ir_rvalue *temp_rhs;
    temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
                                      op[0], op[1]);

    error_emitted =
       do_assignment(instructions, state,
                     this->subexpressions[0]->non_lvalue_description,
                     op[0]->clone(ctx, NULL__null), temp_rhs,
                     &result, needs_rvalue, false,
                     this->subexpressions[0]->get_location());
    break;
 }

 case ast_post_inc:
 case ast_post_dec: {
    this->non_lvalue_description = (this->oper == ast_post_inc)
       ? "post-increment operation" : "post-decrement operation";
    op[0] = this->subexpressions[0]->hir(instructions, state);
    op[1] = constant_one_for_inc_dec(ctx, op[0]->type);

    error_emitted = op[0]->type->is_error() || op[1]->type->is_error();

    if (error_emitted) {
       result = ir_rvalue::error_value(ctx);
       break;
    }

    type = arithmetic_result_type(op[0], op[1], false, state, & loc);

    ir_rvalue *temp_rhs;
    temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
                                      op[0], op[1]);

    /* Get a temporary of a copy of the lvalue before it's modified.
     * This may get thrown away later.
     */
    result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL__null));

    ir_rvalue *junk_rvalue;
    error_emitted =
       do_assignment(instructions, state,
                     this->subexpressions[0]->non_lvalue_description,
                     op[0]->clone(ctx, NULL__null), temp_rhs,
                     &junk_rvalue, false, false,
                     this->subexpressions[0]->get_location());

    break;
 }

 case ast_field_selection:
    result = _mesa_ast_field_selection_to_hir(this, instructions, state);
    break;

 case ast_array_index: {
    YYLTYPE index_loc = subexpressions[1]->get_location();

    /* Getting if an array is being used uninitialized is beyond what we get
     * from ir_value.data.assigned. Setting is_lhs as true would force to
     * not raise a uninitialized warning when using an array
     */
    subexpressions[0]->set_is_lhs(true);
    op[0] = subexpressions[0]->hir(instructions, state);
    op[1] = subexpressions[1]->hir(instructions, state);

    result = _mesa_ast_array_index_to_hir(ctx, state, op[0], op[1],
                                          loc, index_loc);

    if (result->type->is_error())
       error_emitted = true;

    break;
 }

 case ast_unsized_array_dim:
    unreachable("ast_unsized_array_dim: Should never get here.")do { (static_cast <bool> (!"ast_unsized_array_dim: Should never get here."
) ? void (0) : __assert_fail ("!\"ast_unsized_array_dim: Should never get here.\""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
)); __builtin_unreachable(); } while (0);

 case ast_function_call:
    /* Should *NEVER* get here.  ast_function_call should always be handled
     * by ast_function_expression::hir.
     */
    unreachable("ast_function_call: handled elsewhere ")do { (static_cast <bool> (!"ast_function_call: handled elsewhere "
) ? void (0) : __assert_fail ("!\"ast_function_call: handled elsewhere \""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
)); __builtin_unreachable(); } while (0);

 case ast_identifier: {
    /* ast_identifier can appear several places in a full abstract syntax
     * tree.  This particular use must be at location specified in the grammar
     * as 'variable_identifier'.
     */
    ir_variable *var =
       state->symbols->get_variable(this->primary_expression.identifier);

    if (var == NULL__null) {
       /* the identifier might be a subroutine name */
       char *sub_name;
       sub_name = ralloc_asprintf(ctx, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state->stage), this->primary_expression.identifier);
       var = state->symbols->get_variable(sub_name);
       ralloc_free(sub_name);
    }

    if (var != NULL__null) {
       var->data.used = true;
       result = new(ctx) ir_dereference_variable(var);

       if ((var->data.mode == ir_var_auto || var->data.mode == ir_var_shader_out)
           && !this->is_lhs
           && result->variable_referenced()->data.assigned != true
           && !is_gl_identifier(var->name)) {
          _mesa_glsl_warning(&loc, state, "`%s' used uninitialized",
                             this->primary_expression.identifier);
       }

       /* From the EXT_shader_framebuffer_fetch spec:
        *
        *   "Unless the GL_EXT_shader_framebuffer_fetch extension has been
        *    enabled in addition, it's an error to use gl_LastFragData if it
        *    hasn't been explicitly redeclared with layout(noncoherent)."
        */
       if (var->data.fb_fetch_output && var->data.memory_coherent &&
           !state->EXT_shader_framebuffer_fetch_enable) {
          _mesa_glsl_error(&loc, state,
                           "invalid use of framebuffer fetch output not "
                           "qualified with layout(noncoherent)");
       }

    } else {
       _mesa_glsl_error(& loc, state, "`%s' undeclared",
                        this->primary_expression.identifier);

       result = ir_rvalue::error_value(ctx);
       error_emitted = true;
    }
    break;
 }

 case ast_int_constant:
    result = new(ctx) ir_constant(this->primary_expression.int_constant);
    break;

 case ast_uint_constant:
    result = new(ctx) ir_constant(this->primary_expression.uint_constant);
    break;

 case ast_float_constant:
    result = new(ctx) ir_constant(this->primary_expression.float_constant);
    break;

 case ast_bool_constant:
    result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant));
    break;

 case ast_double_constant:
    result = new(ctx) ir_constant(this->primary_expression.double_constant);
    break;

 case ast_uint64_constant:
    result = new(ctx) ir_constant(this->primary_expression.uint64_constant);
    break;

 case ast_int64_constant:
    result = new(ctx) ir_constant(this->primary_expression.int64_constant);
    break;

 case ast_sequence: {
    /* It should not be possible to generate a sequence in the AST without
     * any expressions in it.
     */
    assert(!this->expressions.is_empty())(static_cast <bool> (!this->expressions.is_empty()) ?
 void (0) : __assert_fail ("!this->expressions.is_empty()"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

    /* The r-value of a sequence is the last expression in the sequence.  If
     * the other expressions in the sequence do not have side-effects (and
     * therefore add instructions to the instruction list), they get dropped
     * on the floor.
     */
    exec_node *previous_tail = NULL__null;
    YYLTYPE previous_operand_loc = loc;

    foreach_list_typed (ast_node, ast, link, &this->expressions)for (ast_node * ast = (!exec_node_is_tail_sentinel((&this
->expressions)->head_sentinel.next) ? ((ast_node *) (((
uintptr_t) (&this->expressions)->head_sentinel.next
) - (((char *) &((ast_node *) (&this->expressions)
->head_sentinel.next)->link) - ((char *) (&this->
expressions)->head_sentinel.next)))) : __null); (ast) != __null
; (ast) = (!exec_node_is_tail_sentinel((ast)->link.next) ?
 ((ast_node *) (((uintptr_t) (ast)->link.next) - (((char *
) &((ast_node *) (ast)->link.next)->link) - ((char *
) (ast)->link.next)))) : __null)) {
       /* If one of the operands of comma operator does not generate any
        * code, we want to emit a warning.  At each pass through the loop
        * previous_tail will point to the last instruction in the stream
        * *before* processing the previous operand.  Naturally,
        * instructions->get_tail_raw() will point to the last instruction in
        * the stream *after* processing the previous operand.  If the two
        * pointers match, then the previous operand had no effect.
        *
        * The warning behavior here differs slightly from GCC.  GCC will
        * only emit a warning if none of the left-hand operands have an
        * effect.  However, it will emit a warning for each.  I believe that
        * there are some cases in C (especially with GCC extensions) where
        * it is useful to have an intermediate step in a sequence have no
        * effect, but I don't think these cases exist in GLSL.  Either way,
        * it would be a giant hassle to replicate that behavior.
        */
       if (previous_tail == instructions->get_tail_raw()) {
          _mesa_glsl_warning(&previous_operand_loc, state,
                             "left-hand operand of comma expression has "
                             "no effect");
       }

       /* The tail is directly accessed instead of using the get_tail()
        * method for performance reasons.  get_tail() has extra code to
        * return NULL when the list is empty.  We don't care about that
        * here, so using get_tail_raw() is fine.
        */
       previous_tail = instructions->get_tail_raw();
       previous_operand_loc = ast->get_location();

       result = ast->hir(instructions, state);
    }

    /* Any errors should have already been emitted in the loop above.
     */
    error_emitted = true;
    break;
 }
 }
 type = NULL__null; /* use result->type, not type. */
 assert(error_emitted || (result != NULL || !needs_rvalue))(static_cast <bool> (error_emitted || (result != __null
 || !needs_rvalue)) ? void (0) : __assert_fail ("error_emitted || (result != NULL || !needs_rvalue)"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

 if (result && result->type->is_error() && !error_emitted)
    _mesa_glsl_error(& loc, state, "type mismatch");

 return result;
2155}

2157bool
2158ast_expression::has_sequence_subexpression() const
2159{
 switch (this->oper) {
 case ast_plus:
 case ast_neg:
 case ast_bit_not:
 case ast_logic_not:
 case ast_pre_inc:
 case ast_pre_dec:
 case ast_post_inc:
 case ast_post_dec:
    return this->subexpressions[0]->has_sequence_subexpression();

 case ast_assign:
 case ast_add:
 case ast_sub:
 case ast_mul:
 case ast_div:
 case ast_mod:
 case ast_lshift:
 case ast_rshift:
 case ast_less:
 case ast_greater:
 case ast_lequal:
 case ast_gequal:
 case ast_nequal:
 case ast_equal:
 case ast_bit_and:
 case ast_bit_xor:
 case ast_bit_or:
 case ast_logic_and:
 case ast_logic_or:
 case ast_logic_xor:
 case ast_array_index:
 case ast_mul_assign:
 case ast_div_assign:
 case ast_add_assign:
 case ast_sub_assign:
 case ast_mod_assign:
 case ast_ls_assign:
 case ast_rs_assign:
 case ast_and_assign:
 case ast_xor_assign:
 case ast_or_assign:
    return this->subexpressions[0]->has_sequence_subexpression() ||
           this->subexpressions[1]->has_sequence_subexpression();

 case ast_conditional:
    return this->subexpressions[0]->has_sequence_subexpression() ||
           this->subexpressions[1]->has_sequence_subexpression() ||
           this->subexpressions[2]->has_sequence_subexpression();

 case ast_sequence:
    return true;

 case ast_field_selection:
 case ast_identifier:
 case ast_int_constant:
 case ast_uint_constant:
 case ast_float_constant:
 case ast_bool_constant:
 case ast_double_constant:
 case ast_int64_constant:
 case ast_uint64_constant:
    return false;

 case ast_aggregate:
    return false;

 case ast_function_call:
    unreachable("should be handled by ast_function_expression::hir")do { (static_cast <bool> (!"should be handled by ast_function_expression::hir"
) ? void (0) : __assert_fail ("!\"should be handled by ast_function_expression::hir\""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
)); __builtin_unreachable(); } while (0);

 case ast_unsized_array_dim:
    unreachable("ast_unsized_array_dim: Should never get here.")do { (static_cast <bool> (!"ast_unsized_array_dim: Should never get here."
) ? void (0) : __assert_fail ("!\"ast_unsized_array_dim: Should never get here.\""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
)); __builtin_unreachable(); } while (0);
 }

 return false;
2235}

2237ir_rvalue *
2238ast_expression_statement::hir(exec_list *instructions,
                            struct _mesa_glsl_parse_state *state)
2240{
 /* It is possible to have expression statements that don't have an
  * expression.  This is the solitary semicolon:
  *
  * for (i = 0; i < 5; i++)
  *     ;
  *
  * In this case the expression will be NULL.  Test for NULL and don't do
  * anything in that case.
  */
 if (expression != NULL__null)
    expression->hir_no_rvalue(instructions, state);

 /* Statements do not have r-values.
  */
 return NULL__null;
2256}


2259ir_rvalue *
2260ast_compound_statement::hir(exec_list *instructions,
                          struct _mesa_glsl_parse_state *state)
2262{
 if (new_scope)
    state->symbols->push_scope();

 foreach_list_typed (ast_node, ast, link, &this->statements)for (ast_node * ast = (!exec_node_is_tail_sentinel((&this
->statements)->head_sentinel.next) ? ((ast_node *) (((uintptr_t
) (&this->statements)->head_sentinel.next) - (((char
 *) &((ast_node *) (&this->statements)->head_sentinel
.next)->link) - ((char *) (&this->statements)->head_sentinel
.next)))) : __null); (ast) != __null; (ast) = (!exec_node_is_tail_sentinel
((ast)->link.next) ? ((ast_node *) (((uintptr_t) (ast)->
link.next) - (((char *) &((ast_node *) (ast)->link.next
)->link) - ((char *) (ast)->link.next)))) : __null))
    ast->hir(instructions, state);

 if (new_scope)
    state->symbols->pop_scope();

 /* Compound statements do not have r-values.
  */
 return NULL__null;
2275}

2277/**
* Evaluate the given exec_node (which should be an ast_node representing
* a single array dimension) and return its integer value.
*/
2281static unsigned
2282process_array_size(exec_node *node,
                 struct _mesa_glsl_parse_state *state)
2284{
 void *mem_ctx = state;

 exec_list dummy_instructions;

 ast_node *array_size = exec_node_data(ast_node, node, link)((ast_node *) (((uintptr_t) node) - (((char *) &((ast_node
 *) node)->link) - ((char *) node))));

 /**
  * Dimensions other than the outermost dimension can by unsized if they
  * are immediately sized by a constructor or initializer.
  */
 if (((ast_expression*)array_size)->oper == ast_unsized_array_dim)
    return 0;

 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
 YYLTYPE loc = array_size->get_location();

 if (ir == NULL__null) {
    _mesa_glsl_error(& loc, state,
                     "array size could not be resolved");
    return 0;
 }

 if (!ir->type->is_integer_32()) {
    _mesa_glsl_error(& loc, state,
                     "array size must be integer type");
    return 0;
 }

 if (!ir->type->is_scalar()) {
    _mesa_glsl_error(& loc, state,
                     "array size must be scalar type");
    return 0;
 }

 ir_constant *const size = ir->constant_expression_value(mem_ctx);
 if (size == NULL__null ||
     (state->is_version(120, 300) &&
      array_size->has_sequence_subexpression())) {
    _mesa_glsl_error(& loc, state, "array size must be a "
                     "constant valued expression");
    return 0;
 }

 if (size->value.i[0] <= 0) {
    _mesa_glsl_error(& loc, state, "array size must be > 0");
    return 0;
 }

 assert(size->type == ir->type)(static_cast <bool> (size->type == ir->type) ? void
 (0) : __assert_fail ("size->type == ir->type", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

 /* If the array size is const (and we've verified that
  * it is) then no instructions should have been emitted
  * when we converted it to HIR. If they were emitted,
  * then either the array size isn't const after all, or
  * we are emitting unnecessary instructions.
  */
 assert(dummy_instructions.is_empty())(static_cast <bool> (dummy_instructions.is_empty()) ? void
 (0) : __assert_fail ("dummy_instructions.is_empty()", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

 return size->value.u[0];
2344}

2346static const glsl_type *
2347process_array_type(YYLTYPE *loc, const glsl_type *base,
                 ast_array_specifier *array_specifier,
                 struct _mesa_glsl_parse_state *state)
2350{
 const glsl_type *array_type = base;

 if (array_specifier != NULL__null) {
    if (base->is_array()) {

       /* From page 19 (page 25) of the GLSL 1.20 spec:
        *
        * "Only one-dimensional arrays may be declared."
        */
       if (!state->check_arrays_of_arrays_allowed(loc)) {
          return glsl_type::error_type;
       }
    }

    for (exec_node *node = array_specifier->array_dimensions.get_tail_raw();
         !node->is_head_sentinel(); node = node->prev) {
       unsigned array_size = process_array_size(node, state);
       array_type = glsl_type::get_array_instance(array_type, array_size);
    }
 }

 return array_type;
2373}

2375static bool
2376precision_qualifier_allowed(const glsl_type *type)
2377{
 /* Precision qualifiers apply to floating point, integer and opaque
  * types.
  *
  * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
  *    "Any floating point or any integer declaration can have the type
  *    preceded by one of these precision qualifiers [...] Literal
  *    constants do not have precision qualifiers. Neither do Boolean
  *    variables.
  *
  * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
  * spec also says:
  *
  *     "Precision qualifiers are added for code portability with OpenGL
  *     ES, not for functionality. They have the same syntax as in OpenGL
  *     ES."
  *
  * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
  *
  *     "uniform lowp sampler2D sampler;
  *     highp vec2 coord;
  *     ...
  *     lowp vec4 col = texture2D (sampler, coord);
  *                                            // texture2D returns lowp"
  *
  * From this, we infer that GLSL 1.30 (and later) should allow precision
  * qualifiers on sampler types just like float and integer types.
  */
 const glsl_type *const t = type->without_array();

 return (t->is_float() || t->is_integer_32() || t->contains_opaque()) &&
        !t->is_struct();
2409}

2411const glsl_type *
2412ast_type_specifier::glsl_type(const char **name,
                            struct _mesa_glsl_parse_state *state) const
2414{
 const struct glsl_type *type;

 if (this->type != NULL__null)
    type = this->type;
 else if (structure)
    type = structure->type;
 else
    type = state->symbols->get_type(this->type_name);
 *name = this->type_name;

 YYLTYPE loc = this->get_location();
 type = process_array_type(&loc, type, this->array_specifier, state);

 return type;
2429}

2431/**
* From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
*
* "The precision statement
*
*    precision precision-qualifier type;
*
*  can be used to establish a default precision qualifier. The type field can
*  be either int or float or any of the sampler types, (...) If type is float,
*  the directive applies to non-precision-qualified floating point type
*  (scalar, vector, and matrix) declarations. If type is int, the directive
*  applies to all non-precision-qualified integer type (scalar, vector, signed,
*  and unsigned) declarations."
*
* We use the symbol table to keep the values of the default precisions for
* each 'type' in each scope and we use the 'type' string from the precision
* statement as key in the symbol table. When we want to retrieve the default
* precision associated with a given glsl_type we need to know the type string
* associated with it. This is what this function returns.
*/
2451static const char *
2452get_type_name_for_precision_qualifier(const glsl_type *type)
2453{
 switch (type->base_type) {
 case GLSL_TYPE_FLOAT:
    return "float";
 case GLSL_TYPE_UINT:
 case GLSL_TYPE_INT:
    return "int";
 case GLSL_TYPE_ATOMIC_UINT:
    return "atomic_uint";
 case GLSL_TYPE_IMAGE:
 /* fallthrough */
 case GLSL_TYPE_SAMPLER: {
    const unsigned type_idx =
       type->sampler_array + 2 * type->sampler_shadow;
    const unsigned offset = type->is_sampler() ? 0 : 4;
    assert(type_idx < 4)(static_cast <bool> (type_idx < 4) ? void (0) : __assert_fail
 ("type_idx < 4", __builtin_FILE (), __builtin_LINE (), __extension__
 __PRETTY_FUNCTION__));
    switch (type->sampled_type) {
    case GLSL_TYPE_FLOAT:
       switch (type->sampler_dimensionality) {
       case GLSL_SAMPLER_DIM_1D: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "sampler1D", "sampler1DArray",
            "sampler1DShadow", "sampler1DArrayShadow"
          };
          return names[type_idx];
       }
       case GLSL_SAMPLER_DIM_2D: {
          static const char *const names[8] = {
            "sampler2D", "sampler2DArray",
            "sampler2DShadow", "sampler2DArrayShadow",
            "image2D", "image2DArray", NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_3D: {
          static const char *const names[8] = {
            "sampler3D", NULL__null, NULL__null, NULL__null,
            "image3D", NULL__null, NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_CUBE: {
          static const char *const names[8] = {
            "samplerCube", "samplerCubeArray",
            "samplerCubeShadow", "samplerCubeArrayShadow",
            "imageCube", NULL__null, NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_MS: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "sampler2DMS", "sampler2DMSArray", NULL__null, NULL__null
          };
          return names[type_idx];
       }
       case GLSL_SAMPLER_DIM_RECT: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "samplerRect", NULL__null, "samplerRectShadow", NULL__null
          };
          return names[type_idx];
       }
       case GLSL_SAMPLER_DIM_BUF: {
          static const char *const names[8] = {
            "samplerBuffer", NULL__null, NULL__null, NULL__null,
            "imageBuffer", NULL__null, NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_EXTERNAL: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "samplerExternalOES", NULL__null, NULL__null, NULL__null
          };
          return names[type_idx];
       }
       default:
          unreachable("Unsupported sampler/image dimensionality")do { (static_cast <bool> (!"Unsupported sampler/image dimensionality"
) ? void (0) : __assert_fail ("!\"Unsupported sampler/image dimensionality\""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
)); __builtin_unreachable(); } while (0);
       } /* sampler/image float dimensionality */
       break;
    case GLSL_TYPE_INT:
       switch (type->sampler_dimensionality) {
       case GLSL_SAMPLER_DIM_1D: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "isampler1D", "isampler1DArray", NULL__null, NULL__null
          };
          return names[type_idx];
       }
       case GLSL_SAMPLER_DIM_2D: {
          static const char *const names[8] = {
            "isampler2D", "isampler2DArray", NULL__null, NULL__null,
            "iimage2D", "iimage2DArray", NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_3D: {
          static const char *const names[8] = {
            "isampler3D", NULL__null, NULL__null, NULL__null,
            "iimage3D", NULL__null, NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_CUBE: {
          static const char *const names[8] = {
            "isamplerCube", "isamplerCubeArray", NULL__null, NULL__null,
            "iimageCube", NULL__null, NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_MS: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "isampler2DMS", "isampler2DMSArray", NULL__null, NULL__null
          };
          return names[type_idx];
       }
       case GLSL_SAMPLER_DIM_RECT: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "isamplerRect", NULL__null, "isamplerRectShadow", NULL__null
          };
          return names[type_idx];
       }
       case GLSL_SAMPLER_DIM_BUF: {
          static const char *const names[8] = {
            "isamplerBuffer", NULL__null, NULL__null, NULL__null,
            "iimageBuffer", NULL__null, NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       default:
          unreachable("Unsupported isampler/iimage dimensionality")do { (static_cast <bool> (!"Unsupported isampler/iimage dimensionality"
) ? void (0) : __assert_fail ("!\"Unsupported isampler/iimage dimensionality\""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
)); __builtin_unreachable(); } while (0);
       } /* sampler/image int dimensionality */
       break;
    case GLSL_TYPE_UINT:
       switch (type->sampler_dimensionality) {
       case GLSL_SAMPLER_DIM_1D: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "usampler1D", "usampler1DArray", NULL__null, NULL__null
          };
          return names[type_idx];
       }
       case GLSL_SAMPLER_DIM_2D: {
          static const char *const names[8] = {
            "usampler2D", "usampler2DArray", NULL__null, NULL__null,
            "uimage2D", "uimage2DArray", NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_3D: {
          static const char *const names[8] = {
            "usampler3D", NULL__null, NULL__null, NULL__null,
            "uimage3D", NULL__null, NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_CUBE: {
          static const char *const names[8] = {
            "usamplerCube", "usamplerCubeArray", NULL__null, NULL__null,
            "uimageCube", NULL__null, NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       case GLSL_SAMPLER_DIM_MS: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "usampler2DMS", "usampler2DMSArray", NULL__null, NULL__null
          };
          return names[type_idx];
       }
       case GLSL_SAMPLER_DIM_RECT: {
          assert(type->is_sampler())(static_cast <bool> (type->is_sampler()) ? void (0) :
 __assert_fail ("type->is_sampler()", __builtin_FILE (), __builtin_LINE
 (), __extension__ __PRETTY_FUNCTION__));
          static const char *const names[4] = {
            "usamplerRect", NULL__null, "usamplerRectShadow", NULL__null
          };
          return names[type_idx];
       }
       case GLSL_SAMPLER_DIM_BUF: {
          static const char *const names[8] = {
            "usamplerBuffer", NULL__null, NULL__null, NULL__null,
            "uimageBuffer", NULL__null, NULL__null, NULL__null
          };
          return names[offset + type_idx];
       }
       default:
          unreachable("Unsupported usampler/uimage dimensionality")do { (static_cast <bool> (!"Unsupported usampler/uimage dimensionality"
) ? void (0) : __assert_fail ("!\"Unsupported usampler/uimage dimensionality\""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
)); __builtin_unreachable(); } while (0);
       } /* sampler/image uint dimensionality */
       break;
    default:
       unreachable("Unsupported sampler/image type")do { (static_cast <bool> (!"Unsupported sampler/image type"
) ? void (0) : __assert_fail ("!\"Unsupported sampler/image type\""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
)); __builtin_unreachable(); } while (0);
    } /* sampler/image type */
    break;
 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
 break;
 default:
    unreachable("Unsupported type")do { (static_cast <bool> (!"Unsupported type") ? void (
0) : __assert_fail ("!\"Unsupported type\"", __builtin_FILE (
), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__)); __builtin_unreachable
(); } while (0);
 } /* base type */
2654}

2656static unsigned
2657select_gles_precision(unsigned qual_precision,
                    const glsl_type *type,
                    struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
2660{
 /* Precision qualifiers do not have any meaning in Desktop GLSL.
  * In GLES we take the precision from the type qualifier if present,
  * otherwise, if the type of the variable allows precision qualifiers at
  * all, we look for the default precision qualifier for that type in the
  * current scope.
  */
 assert(state->es_shader)(static_cast <bool> (state->es_shader) ? void (0) : __assert_fail
 ("state->es_shader", __builtin_FILE (), __builtin_LINE ()
, __extension__ __PRETTY_FUNCTION__));

 unsigned precision = GLSL_PRECISION_NONE;
 if (qual_precision) {
    precision = qual_precision;
 } else if (precision_qualifier_allowed(type)) {
    const char *type_name =
       get_type_name_for_precision_qualifier(type->without_array());
    assert(type_name != NULL)(static_cast <bool> (type_name != __null) ? void (0) : __assert_fail
 ("type_name != NULL", __builtin_FILE (), __builtin_LINE (), __extension__
 __PRETTY_FUNCTION__));

    precision =
       state->symbols->get_default_precision_qualifier(type_name);
    if (precision == ast_precision_none) {
       _mesa_glsl_error(loc, state,
                        "No precision specified in this scope for type `%s'",
                        type->name);
    }
 }


 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
  *
  *    "The default precision of all atomic types is highp. It is an error to
  *    declare an atomic type with a different precision or to specify the
  *    default precision for an atomic type to be lowp or mediump."
  */
 if (type->is_atomic_uint() && precision != ast_precision_high) {
    _mesa_glsl_error(loc, state,
                     "atomic_uint can only have highp precision qualifier");
 }

 return precision;
2699}

2701const glsl_type *
2702ast_fully_specified_type::glsl_type(const char **name,
                                  struct _mesa_glsl_parse_state *state) const
2704{
 return this->specifier->glsl_type(name, state);
2706}

2708/**
* Determine whether a toplevel variable declaration declares a varying.  This
* function operates by examining the variable's mode and the shader target,
* so it correctly identifies linkage variables regardless of whether they are
* declared using the deprecated "varying" syntax or the new "in/out" syntax.
*
* Passing a non-toplevel variable declaration (e.g. a function parameter) to
* this function will produce undefined results.
*/
2717static bool
2718is_varying_var(ir_variable *var, gl_shader_stage target)
2719{
 switch (target) {
 case MESA_SHADER_VERTEX:
    return var->data.mode == ir_var_shader_out;
 case MESA_SHADER_FRAGMENT:
    return var->data.mode == ir_var_shader_in ||
           (var->data.mode == ir_var_system_value &&
            var->data.location == SYSTEM_VALUE_FRAG_COORD);
 default:
    return var->data.mode == ir_var_shader_out || var->data.mode == ir_var_shader_in;
 }
2730}

2732static bool
2733is_allowed_invariant(ir_variable *var, struct _mesa_glsl_parse_state *state)
2734{
 if (is_varying_var(var, state->stage))
    return true;

 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
  * "Only variables output from a vertex shader can be candidates
  * for invariance".
  */
 if (!state->is_version(130, 100))
    return false;

 /*
  * Later specs remove this language - so allowed invariant
  * on fragment shader outputs as well.
  */
 if (state->stage == MESA_SHADER_FRAGMENT &&
     var->data.mode == ir_var_shader_out)
    return true;
 return false;
2753}

2755/**
* Matrix layout qualifiers are only allowed on certain types
*/
2758static void
2759validate_matrix_layout_for_type(struct _mesa_glsl_parse_state *state,
                              YYLTYPE *loc,
                              const glsl_type *type,
                              ir_variable *var)
2763{
 if (var && !var->is_in_buffer_block()) {
    /* Layout qualifiers may only apply to interface blocks and fields in
     * them.
     */
    _mesa_glsl_error(loc, state,
                     "uniform block layout qualifiers row_major and "
                     "column_major may not be applied to variables "
                     "outside of uniform blocks");
 } else if (!type->without_array()->is_matrix()) {
    /* The OpenGL ES 3.0 conformance tests did not originally allow
     * matrix layout qualifiers on non-matrices.  However, the OpenGL
     * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
     * amended to specifically allow these layouts on all types.  Emit
     * a warning so that people know their code may not be portable.
     */
    _mesa_glsl_warning(loc, state,
                       "uniform block layout qualifiers row_major and "
                       "column_major applied to non-matrix types may "
                       "be rejected by older compilers");
 }
2784}

2786static bool
2787validate_xfb_buffer_qualifier(YYLTYPE *loc,
                            struct _mesa_glsl_parse_state *state,
                            unsigned xfb_buffer) {
 if (xfb_buffer >= state->Const.MaxTransformFeedbackBuffers) {
    _mesa_glsl_error(loc, state,
                     "invalid xfb_buffer specified %d is larger than "
                     "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
                     xfb_buffer,
                     state->Const.MaxTransformFeedbackBuffers - 1);
    return false;
 }

 return true;
2800}

2802/* From the ARB_enhanced_layouts spec:
*
*    "Variables and block members qualified with *xfb_offset* can be
*    scalars, vectors, matrices, structures, and (sized) arrays of these.
*    The offset must be a multiple of the size of the first component of
*    the first qualified variable or block member, or a compile-time error
*    results.  Further, if applied to an aggregate containing a double,
*    the offset must also be a multiple of 8, and the space taken in the
*    buffer will be a multiple of 8.
*/
2812static bool
2813validate_xfb_offset_qualifier(YYLTYPE *loc,
                            struct _mesa_glsl_parse_state *state,
                            int xfb_offset, const glsl_type *type,
                            unsigned component_size) {
const glsl_type *t_without_array = type->without_array();

 if (xfb_offset != -1 && type->is_unsized_array()) {
    _mesa_glsl_error(loc, state,
                     "xfb_offset can't be used with unsized arrays.");
    return false;
 }

 /* Make sure nested structs don't contain unsized arrays, and validate
  * any xfb_offsets on interface members.
  */
 if (t_without_array->is_struct() || t_without_array->is_interface())
    for (unsigned int i = 0; i < t_without_array->length; i++) {
       const glsl_type *member_t = t_without_array->fields.structure[i].type;

       /* When the interface block doesn't have an xfb_offset qualifier then
        * we apply the component size rules at the member level.
        */
       if (xfb_offset == -1)
          component_size = member_t->contains_double() ? 8 : 4;

       int xfb_offset = t_without_array->fields.structure[i].offset;
       validate_xfb_offset_qualifier(loc, state, xfb_offset, member_t,
                                     component_size);
    }

/* Nested structs or interface block without offset may not have had an
 * offset applied yet so return.
 */
 if (xfb_offset == -1) {
   return true;
 }

 if (xfb_offset % component_size) {
    _mesa_glsl_error(loc, state,
                     "invalid qualifier xfb_offset=%d must be a multiple "
                     "of the first component size of the first qualified "
                     "variable or block member. Or double if an aggregate "
                     "that contains a double (%d).",
                     xfb_offset, component_size);
    return false;
 }

 return true;
2861}

2863static bool
2864validate_stream_qualifier(YYLTYPE *loc, struct _mesa_glsl_parse_state *state,
                        unsigned stream)
2866{
 if (stream >= state->ctx->Const.MaxVertexStreams) {
    _mesa_glsl_error(loc, state,
                     "invalid stream specified %d is larger than "
                     "MAX_VERTEX_STREAMS - 1 (%d).",
                     stream, state->ctx->Const.MaxVertexStreams - 1);
    return false;
 }

 return true;
2876}

2878static void
2879apply_explicit_binding(struct _mesa_glsl_parse_state *state,
                     YYLTYPE *loc,
                     ir_variable *var,
                     const glsl_type *type,
                     const ast_type_qualifier *qual)
2884{
 if (!qual->flags.q.uniform && !qual->flags.q.buffer) {
    _mesa_glsl_error(loc, state,
                     "the \"binding\" qualifier only applies to uniforms and "
                     "shader storage buffer objects");
    return;
 }

 unsigned qual_binding;
 if (!process_qualifier_constant(state, loc, "binding", qual->binding,
                                 &qual_binding)) {
    return;
 }

 const struct gl_context *const ctx = state->ctx;
 unsigned elements = type->is_array() ? type->arrays_of_arrays_size() : 1;
 unsigned max_index = qual_binding + elements - 1;
 const glsl_type *base_type = type->without_array();

 if (base_type->is_interface()) {
    /* UBOs.  From page 60 of the GLSL 4.20 specification:
     * "If the binding point for any uniform block instance is less than zero,
     *  or greater than or equal to the implementation-dependent maximum
     *  number of uniform buffer bindings, a compilation error will occur.
     *  When the binding identifier is used with a uniform block instanced as
     *  an array of size N, all elements of the array from binding through
     *  binding + N – 1 must be within this range."
     *
     * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
     */
    if (qual->flags.q.uniform &&
       max_index >= ctx->Const.MaxUniformBufferBindings) {
       _mesa_glsl_error(loc, state, "layout(binding = %u) for %d UBOs exceeds "
                        "the maximum number of UBO binding points (%d)",
                        qual_binding, elements,
                        ctx->Const.MaxUniformBufferBindings);
       return;
    }

    /* SSBOs. From page 67 of the GLSL 4.30 specification:
     * "If the binding point for any uniform or shader storage block instance
     *  is less than zero, or greater than or equal to the
     *  implementation-dependent maximum number of uniform buffer bindings, a
     *  compile-time error will occur. When the binding identifier is used
     *  with a uniform or shader storage block instanced as an array of size
     *  N, all elements of the array from binding through binding + N – 1 must
     *  be within this range."
     */
    if (qual->flags.q.buffer &&
       max_index >= ctx->Const.MaxShaderStorageBufferBindings) {
       _mesa_glsl_error(loc, state, "layout(binding = %u) for %d SSBOs exceeds "
                        "the maximum number of SSBO binding points (%d)",
                        qual_binding, elements,
                        ctx->Const.MaxShaderStorageBufferBindings);
       return;
    }
 } else if (base_type->is_sampler()) {
    /* Samplers.  From page 63 of the GLSL 4.20 specification:
     * "If the binding is less than zero, or greater than or equal to the
     *  implementation-dependent maximum supported number of units, a
     *  compilation error will occur. When the binding identifier is used
     *  with an array of size N, all elements of the array from binding
     *  through binding + N - 1 must be within this range."
     */
    unsigned limit = ctx->Const.MaxCombinedTextureImageUnits;

    if (max_index >= limit) {
       _mesa_glsl_error(loc, state, "layout(binding = %d) for %d samplers "
                        "exceeds the maximum number of texture image units "
                        "(%u)", qual_binding, elements, limit);

       return;
    }
 } else if (base_type->contains_atomic()) {
    assert(ctx->Const.MaxAtomicBufferBindings <= MAX_COMBINED_ATOMIC_BUFFERS)(static_cast <bool> (ctx->Const.MaxAtomicBufferBindings
 <= (15 * 6)) ? void (0) : __assert_fail ("ctx->Const.MaxAtomicBufferBindings <= MAX_COMBINED_ATOMIC_BUFFERS"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
    if (qual_binding >= ctx->Const.MaxAtomicBufferBindings) {
       _mesa_glsl_error(loc, state, "layout(binding = %d) exceeds the "
                        "maximum number of atomic counter buffer bindings "
                        "(%u)", qual_binding,
                        ctx->Const.MaxAtomicBufferBindings);

       return;
    }
 } else if ((state->is_version(420, 310) ||
             state->ARB_shading_language_420pack_enable) &&
            base_type->is_image()) {
    assert(ctx->Const.MaxImageUnits <= MAX_IMAGE_UNITS)(static_cast <bool> (ctx->Const.MaxImageUnits <= (
* 6)) ? void (0) : __assert_fail ("ctx->Const.MaxImageUnits <= MAX_IMAGE_UNITS"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
    if (max_index >= ctx->Const.MaxImageUnits) {
       _mesa_glsl_error(loc, state, "Image binding %d exceeds the "
                        "maximum number of image units (%d)", max_index,
                        ctx->Const.MaxImageUnits);
       return;
    }

 } else {
    _mesa_glsl_error(loc, state,
                     "the \"binding\" qualifier only applies to uniform "
                     "blocks, storage blocks, opaque variables, or arrays "
                     "thereof");
    return;
 }

 var->data.explicit_binding = true;
 var->data.binding = qual_binding;

 return;
2990}

2992static void
2993validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state *state,
                                         YYLTYPE *loc,
                                         const glsl_interp_mode interpolation,
                                         const struct glsl_type *var_type,
                                         ir_variable_mode mode)
2998{
 if (state->stage != MESA_SHADER_FRAGMENT ||
     interpolation == INTERP_MODE_FLAT ||
     mode != ir_var_shader_in)
    return;

 /* Integer fragment inputs must be qualified with 'flat'.  In GLSL ES,
  * so must integer vertex outputs.
  *
  * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
  *    "Fragment shader inputs that are signed or unsigned integers or
  *    integer vectors must be qualified with the interpolation qualifier
  *    flat."
  *
  * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
  *    "Fragment shader inputs that are, or contain, signed or unsigned
  *    integers or integer vectors must be qualified with the
  *    interpolation qualifier flat."
  *
  * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
  *    "Vertex shader outputs that are, or contain, signed or unsigned
  *    integers or integer vectors must be qualified with the
  *    interpolation qualifier flat."
  *
  * Note that prior to GLSL 1.50, this requirement applied to vertex
  * outputs rather than fragment inputs.  That creates problems in the
  * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
  * desktop GL shaders.  For GLSL ES shaders, we follow the spec and
  * apply the restriction to both vertex outputs and fragment inputs.
  *
  * Note also that the desktop GLSL specs are missing the text "or
  * contain"; this is presumably an oversight, since there is no
  * reasonable way to interpolate a fragment shader input that contains
  * an integer. See Khronos bug #15671.
  */
 if ((state->is_version(130, 300) || state->EXT_gpu_shader4_enable)
     && var_type->contains_integer()) {
    _mesa_glsl_error(loc, state, "if a fragment input is (or contains) "
                     "an integer, then it must be qualified with 'flat'");
 }

 /* Double fragment inputs must be qualified with 'flat'.
  *
  * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
  *    "This extension does not support interpolation of double-precision
  *    values; doubles used as fragment shader inputs must be qualified as
  *    "flat"."
  *
  * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
  *    "Fragment shader inputs that are signed or unsigned integers, integer
  *    vectors, or any double-precision floating-point type must be
  *    qualified with the interpolation qualifier flat."
  *
  * Note that the GLSL specs are missing the text "or contain"; this is
  * presumably an oversight. See Khronos bug #15671.
  *
  * The 'double' type does not exist in GLSL ES so far.
  */
 if (state->has_double()
     && var_type->contains_double()) {
    _mesa_glsl_error(loc, state, "if a fragment input is (or contains) "
                     "a double, then it must be qualified with 'flat'");
 }

 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
  *
  * From section 4.3.4 of the ARB_bindless_texture spec:
  *
  *    "(modify last paragraph, p. 35, allowing samplers and images as
  *     fragment shader inputs) ... Fragment inputs can only be signed and
  *     unsigned integers and integer vectors, floating point scalars,
  *     floating-point vectors, matrices, sampler and image types, or arrays
  *     or structures of these.  Fragment shader inputs that are signed or
  *     unsigned integers, integer vectors, or any double-precision floating-
  *     point type, or any sampler or image type must be qualified with the
  *     interpolation qualifier "flat"."
  */
 if (state->has_bindless()
     && (var_type->contains_sampler() || var_type->contains_image())) {
    _mesa_glsl_error(loc, state, "if a fragment input is (or contains) "
                     "a bindless sampler (or image), then it must be "
                     "qualified with 'flat'");
 }
3081}

3083static void
3084validate_interpolation_qualifier(struct _mesa_glsl_parse_state *state,
                               YYLTYPE *loc,
                               const glsl_interp_mode interpolation,
                               const struct ast_type_qualifier *qual,
                               const struct glsl_type *var_type,
                               ir_variable_mode mode)
3090{
 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
  * not to vertex shader inputs nor fragment shader outputs.
  *
  * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
  *    "Outputs from a vertex shader (out) and inputs to a fragment
  *    shader (in) can be further qualified with one or more of these
  *    interpolation qualifiers"
  *    ...
  *    "These interpolation qualifiers may only precede the qualifiers in,
  *    centroid in, out, or centroid out in a declaration. They do not apply
  *    to the deprecated storage qualifiers varying or centroid
  *    varying. They also do not apply to inputs into a vertex shader or
  *    outputs from a fragment shader."
  *
  * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
  *    "Outputs from a shader (out) and inputs to a shader (in) can be
  *    further qualified with one of these interpolation qualifiers."
  *    ...
  *    "These interpolation qualifiers may only precede the qualifiers
  *    in, centroid in, out, or centroid out in a declaration. They do
  *    not apply to inputs into a vertex shader or outputs from a
  *    fragment shader."
  */
 if ((state->is_version(130, 300) || state->EXT_gpu_shader4_enable)
     && interpolation != INTERP_MODE_NONE) {
    const char *i = interpolation_string(interpolation);
    if (mode != ir_var_shader_in && mode != ir_var_shader_out)
       _mesa_glsl_error(loc, state,
                        "interpolation qualifier `%s' can only be applied to "
                        "shader inputs or outputs.", i);

    switch (state->stage) {
    case MESA_SHADER_VERTEX:
       if (mode == ir_var_shader_in) {
          _mesa_glsl_error(loc, state,
                           "interpolation qualifier '%s' cannot be applied to "
                           "vertex shader inputs", i);
       }
       break;
    case MESA_SHADER_FRAGMENT:
       if (mode == ir_var_shader_out) {
          _mesa_glsl_error(loc, state,
                           "interpolation qualifier '%s' cannot be applied to "
                           "fragment shader outputs", i);
       }
       break;
    default:
       break;
    }
 }

 /* Interpolation qualifiers cannot be applied to 'centroid' and
  * 'centroid varying'.
  *
  * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
  *    "interpolation qualifiers may only precede the qualifiers in,
  *    centroid in, out, or centroid out in a declaration. They do not apply
  *    to the deprecated storage qualifiers varying or centroid varying."
  *
  * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
  *
  * GL_EXT_gpu_shader4 allows this.
  */
 if (state->is_version(130, 0) && !state->EXT_gpu_shader4_enable
     && interpolation != INTERP_MODE_NONE
     && qual->flags.q.varying) {

    const char *i = interpolation_string(interpolation);
    const char *s;
    if (qual->flags.q.centroid)
       s = "centroid varying";
    else
       s = "varying";

    _mesa_glsl_error(loc, state,
                     "qualifier '%s' cannot be applied to the "
                     "deprecated storage qualifier '%s'", i, s);
 }

 validate_fragment_flat_interpolation_input(state, loc, interpolation,
                                            var_type, mode);
3172}

3174static glsl_interp_mode
3175interpret_interpolation_qualifier(const struct ast_type_qualifier *qual,
                                const struct glsl_type *var_type,
                                ir_variable_mode mode,
                                struct _mesa_glsl_parse_state *state,
                                YYLTYPE *loc)
3180{
 glsl_interp_mode interpolation;
 if (qual->flags.q.flat)
    interpolation = INTERP_MODE_FLAT;
 else if (qual->flags.q.noperspective)
    interpolation = INTERP_MODE_NOPERSPECTIVE;
 else if (qual->flags.q.smooth)
    interpolation = INTERP_MODE_SMOOTH;
 else
    interpolation = INTERP_MODE_NONE;

 validate_interpolation_qualifier(state, loc,
                                  interpolation,
                                  qual, var_type, mode);

 return interpolation;
3196}


3199static void
3200apply_explicit_location(const struct ast_type_qualifier *qual,
                      ir_variable *var,
                      struct _mesa_glsl_parse_state *state,
                      YYLTYPE *loc)
3204{
 bool fail = false;

 unsigned qual_location;
 if (!process_qualifier_constant(state, loc, "location", qual->location,
                                 &qual_location)) {
    return;
 }

 /* Checks for GL_ARB_explicit_uniform_location. */
 if (qual->flags.q.uniform) {
    if (!state->check_explicit_uniform_location_allowed(loc, var))
       return;

    const struct gl_context *const ctx = state->ctx;
    unsigned max_loc = qual_location + var->type->uniform_locations() - 1;

    if (max_loc >= ctx->Const.MaxUserAssignableUniformLocations) {
       _mesa_glsl_error(loc, state, "location(s) consumed by uniform %s "
                        ">= MAX_UNIFORM_LOCATIONS (%u)", var->name,
                        ctx->Const.MaxUserAssignableUniformLocations);
       return;
    }

    var->data.explicit_location = true;
    var->data.location = qual_location;
    return;
 }

 /* Between GL_ARB_explicit_attrib_location an
  * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
  * stage can be assigned explicit locations.  The checking here associates
  * the correct extension with the correct stage's input / output:
  *
  *                     input            output
  *                     -----            ------
  * vertex              explicit_loc     sso
  * tess control        sso              sso
  * tess eval           sso              sso
  * geometry            sso              sso
  * fragment            sso              explicit_loc
  */
 switch (state->stage) {
 case MESA_SHADER_VERTEX:
    if (var->data.mode == ir_var_shader_in) {
       if (!state->check_explicit_attrib_location_allowed(loc, var))
          return;

       break;
    }

    if (var->data.mode == ir_var_shader_out) {
       if (!state->check_separate_shader_objects_allowed(loc, var))
          return;

       break;
    }

    fail = true;
    break;

 case MESA_SHADER_TESS_CTRL:
 case MESA_SHADER_TESS_EVAL:
 case MESA_SHADER_GEOMETRY:
    if (var->data.mode == ir_var_shader_in || var->data.mode == ir_var_shader_out) {
       if (!state->check_separate_shader_objects_allowed(loc, var))
          return;

       break;
    }

    fail = true;
    break;

 case MESA_SHADER_FRAGMENT:
    if (var->data.mode == ir_var_shader_in) {
       if (!state->check_separate_shader_objects_allowed(loc, var))
          return;

       break;
    }

    if (var->data.mode == ir_var_shader_out) {
       if (!state->check_explicit_attrib_location_allowed(loc, var))
          return;

       break;
    }

    fail = true;
    break;

 case MESA_SHADER_COMPUTE:
    _mesa_glsl_error(loc, state,
                     "compute shader variables cannot be given "
                     "explicit locations");
    return;
 default:
    fail = true;
    break;
 };

 if (fail) {
    _mesa_glsl_error(loc, state,
                     "%s cannot be given an explicit location in %s shader",
                     mode_string(var),
    _mesa_shader_stage_to_string(state->stage));
 } else {
    var->data.explicit_location = true;

    switch (state->stage) {
    case MESA_SHADER_VERTEX:
       var->data.location = (var->data.mode == ir_var_shader_in)
          ? (qual_location + VERT_ATTRIB_GENERIC0)
          : (qual_location + VARYING_SLOT_VAR0);
       break;

    case MESA_SHADER_TESS_CTRL:
    case MESA_SHADER_TESS_EVAL:
    case MESA_SHADER_GEOMETRY:
       if (var->data.patch)
          var->data.location = qual_location + VARYING_SLOT_PATCH0((VARYING_SLOT_VAR0 + 32));
       else
          var->data.location = qual_location + VARYING_SLOT_VAR0;
       break;

    case MESA_SHADER_FRAGMENT:
       var->data.location = (var->data.mode == ir_var_shader_out)
          ? (qual_location + FRAG_RESULT_DATA0)
          : (qual_location + VARYING_SLOT_VAR0);
       break;
    default:
       assert(!"Unexpected shader type")(static_cast <bool> (!"Unexpected shader type") ? void (
0) : __assert_fail ("!\"Unexpected shader type\"", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));
       break;
    }

    /* Check if index was set for the uniform instead of the function */
    if (qual->flags.q.explicit_index && qual->is_subroutine_decl()) {
       _mesa_glsl_error(loc, state, "an index qualifier can only be "
                        "used with subroutine functions");
       return;
    }

    unsigned qual_index;
    if (qual->flags.q.explicit_index &&
        process_qualifier_constant(state, loc, "index", qual->index,
                                   &qual_index)) {
       /* From the GLSL 4.30 specification, section 4.4.2 (Output
        * Layout Qualifiers):
        *
        * "It is also a compile-time error if a fragment shader
        *  sets a layout index to less than 0 or greater than 1."
        *
        * Older specifications don't mandate a behavior; we take
        * this as a clarification and always generate the error.
        */
       if (qual_index > 1) {
          _mesa_glsl_error(loc, state,
                           "explicit index may only be 0 or 1");
       } else {
          var->data.explicit_index = true;
          var->data.index = qual_index;
       }
    }
 }
3369}

3371static bool
3372validate_storage_for_sampler_image_types(ir_variable *var,
                                       struct _mesa_glsl_parse_state *state,
                                       YYLTYPE *loc)
3375{
 /* From section 4.1.7 of the GLSL 4.40 spec:
  *
  *    "[Opaque types] can only be declared as function
  *     parameters or uniform-qualified variables."
  *
  * From section 4.1.7 of the ARB_bindless_texture spec:
  *
  *    "Samplers may be declared as shader inputs and outputs, as uniform
  *     variables, as temporary variables, and as function parameters."
  *
  * From section 4.1.X of the ARB_bindless_texture spec:
  *
  *    "Images may be declared as shader inputs and outputs, as uniform
  *     variables, as temporary variables, and as function parameters."
  */
 if (state->has_bindless()) {
    if (var->data.mode != ir_var_auto &&
        var->data.mode != ir_var_uniform &&
        var->data.mode != ir_var_shader_in &&
        var->data.mode != ir_var_shader_out &&
        var->data.mode != ir_var_function_in &&
        var->data.mode != ir_var_function_out &&
        var->data.mode != ir_var_function_inout) {
       _mesa_glsl_error(loc, state, "bindless image/sampler variables may "
                       "only be declared as shader inputs and outputs, as "
                       "uniform variables, as temporary variables and as "
                       "function parameters");
       return false;
    }
 } else {
    if (var->data.mode != ir_var_uniform &&
        var->data.mode != ir_var_function_in) {
       _mesa_glsl_error(loc, state, "image/sampler variables may only be "
                        "declared as function parameters or "
                        "uniform-qualified global variables");
       return false;
    }
 }
 return true;
3415}

3417static bool
3418validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state *state,
                                 YYLTYPE *loc,
                                 const struct ast_type_qualifier *qual,
                                 const glsl_type *type)
3422{
 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
  *
  * "Memory qualifiers are only supported in the declarations of image
  *  variables, buffer variables, and shader storage blocks; it is an error
  *  to use such qualifiers in any other declarations.
  */
 if (!type->is_image() && !qual->flags.q.buffer) {
    if (qual->flags.q.read_only ||
        qual->flags.q.write_only ||
        qual->flags.q.coherent ||
        qual->flags.q._volatile ||
        qual->flags.q.restrict_flag) {
       _mesa_glsl_error(loc, state, "memory qualifiers may only be applied "
                        "in the declarations of image variables, buffer "
                        "variables, and shader storage blocks");
       return false;
    }
 }
 return true;
3442}

3444static bool
3445validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state *state,
                                       YYLTYPE *loc,
                                       const struct ast_type_qualifier *qual,
                                       const glsl_type *type)
3449{
 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
  *
  * "Format layout qualifiers can be used on image variable declarations
  *  (those declared with a basic type  having “image ” in its keyword)."
  */
 if (!type->is_image() && qual->flags.q.explicit_image_format) {
    _mesa_glsl_error(loc, state, "format layout qualifiers may only be "
                     "applied to images");
    return false;
 }
 return true;
3461}

3463static void
3464apply_image_qualifier_to_variable(const struct ast_type_qualifier *qual,
                                ir_variable *var,
                                struct _mesa_glsl_parse_state *state,
                                YYLTYPE *loc)
3468{
 const glsl_type *base_type = var->type->without_array();

 if (!validate_image_format_qualifier_for_type(state, loc, qual, base_type) ||
     !validate_memory_qualifier_for_type(state, loc, qual, base_type))
    return;

 if (!base_type->is_image())
    return;

 if (!validate_storage_for_sampler_image_types(var, state, loc))
    return;

 var->data.memory_read_only |= qual->flags.q.read_only;
 var->data.memory_write_only |= qual->flags.q.write_only;
 var->data.memory_coherent |= qual->flags.q.coherent;
 var->data.memory_volatile |= qual->flags.q._volatile;
 var->data.memory_restrict |= qual->flags.q.restrict_flag;

 if (qual->flags.q.explicit_image_format) {
    if (var->data.mode == ir_var_function_in) {
       _mesa_glsl_error(loc, state, "format qualifiers cannot be used on "
                        "image function parameters");
    }

    if (qual->image_base_type != base_type->sampled_type) {
       _mesa_glsl_error(loc, state, "format qualifier doesn't match the base "
                        "data type of the image");
    }

    var->data.image_format = qual->image_format;
 } else if (state->has_image_load_formatted()) {
    if (var->data.mode == ir_var_uniform &&
        state->EXT_shader_image_load_formatted_warn) {
       _mesa_glsl_warning(loc, state, "GL_EXT_image_load_formatted used");
    }
 } else {
    if (var->data.mode == ir_var_uniform) {
       if (state->es_shader ||
           !(state->is_version(420, 310) || state->ARB_shader_image_load_store_enable)) {
          _mesa_glsl_error(loc, state, "all image uniforms must have a "
                           "format layout qualifier");
       } else if (!qual->flags.q.write_only) {
          _mesa_glsl_error(loc, state, "image uniforms not qualified with "
                           "`writeonly' must have a format layout qualifier");
       }
    }
    var->data.image_format = PIPE_FORMAT_NONE;
 }

 /* From page 70 of the GLSL ES 3.1 specification:
  *
  * "Except for image variables qualified with the format qualifiers r32f,
  *  r32i, and r32ui, image variables must specify either memory qualifier
  *  readonly or the memory qualifier writeonly."
  */
 if (state->es_shader &&
     var->data.image_format != PIPE_FORMAT_R32_FLOAT &&
     var->data.image_format != PIPE_FORMAT_R32_SINT &&
     var->data.image_format != PIPE_FORMAT_R32_UINT &&
     !var->data.memory_read_only &&
     !var->data.memory_write_only) {
    _mesa_glsl_error(loc, state, "image variables of format other than r32f, "
                     "r32i or r32ui must be qualified `readonly' or "
                     "`writeonly'");
 }
3534}

3536static inline const char*
3537get_layout_qualifier_string(bool origin_upper_left, bool pixel_center_integer)
3538{
 if (origin_upper_left && pixel_center_integer)
    return "origin_upper_left, pixel_center_integer";
 else if (origin_upper_left)
    return "origin_upper_left";
 else if (pixel_center_integer)
    return "pixel_center_integer";
 else
    return " ";
3547}

3549static inline bool
3550is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state *state,
                                     const struct ast_type_qualifier *qual)
3552{
 /* If gl_FragCoord was previously declared, and the qualifiers were
  * different in any way, return true.
  */
 if (state->fs_redeclares_gl_fragcoord) {
    return (state->fs_pixel_center_integer != qual->flags.q.pixel_center_integer
       || state->fs_origin_upper_left != qual->flags.q.origin_upper_left);
 }

 return false;
3562}

3564static inline bool
3565is_conflicting_layer_redeclaration(struct _mesa_glsl_parse_state *state,
                                 const struct ast_type_qualifier *qual)
3567{
 if (state->redeclares_gl_layer) {
    return state->layer_viewport_relative != qual->flags.q.viewport_relative;
 }
 return false;
3572}

3574static inline void
3575validate_array_dimensions(const glsl_type *t,
                        struct _mesa_glsl_parse_state *state,
                        YYLTYPE *loc) {
 if (t->is_array()) {
    t = t->fields.array;
    while (t->is_array()) {
       if (t->is_unsized_array()) {
          _mesa_glsl_error(loc, state,
                           "only the outermost array dimension can "
                           "be unsized",
                           t->name);
          break;
       }
       t = t->fields.array;
    }
 }
3591}

3593static void
3594apply_bindless_qualifier_to_variable(const struct ast_type_qualifier *qual,
                                   ir_variable *var,
                                   struct _mesa_glsl_parse_state *state,
                                   YYLTYPE *loc)
3598{
 bool has_local_qualifiers = qual->flags.q.bindless_sampler ||
                             qual->flags.q.bindless_image ||
                             qual->flags.q.bound_sampler ||
                             qual->flags.q.bound_image;

 /* The ARB_bindless_texture spec says:
  *
  * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
  *  spec"
  *
  * "If these layout qualifiers are applied to other types of default block
  *  uniforms, or variables with non-uniform storage, a compile-time error
  *  will be generated."
  */
 if (has_local_qualifiers && !qual->flags.q.uniform) {
    _mesa_glsl_error(loc, state, "ARB_bindless_texture layout qualifiers "
                     "can only be applied to default block uniforms or "
                     "variables with uniform storage");
    return;
 }

 /* The ARB_bindless_texture spec doesn't state anything in this situation,
  * but it makes sense to only allow bindless_sampler/bound_sampler for
  * sampler types, and respectively bindless_image/bound_image for image
  * types.
  */
 if ((qual->flags.q.bindless_sampler || qual->flags.q.bound_sampler) &&
     !var->type->contains_sampler()) {
    _mesa_glsl_error(loc, state, "bindless_sampler or bound_sampler can only "
                     "be applied to sampler types");
    return;
 }

 if ((qual->flags.q.bindless_image || qual->flags.q.bound_image) &&
     !var->type->contains_image()) {
    _mesa_glsl_error(loc, state, "bindless_image or bound_image can only be "
                     "applied to image types");
    return;
 }

 /* The bindless_sampler/bindless_image (and respectively
  * bound_sampler/bound_image) layout qualifiers can be set at global and at
  * local scope.
  */
 if (var->type->contains_sampler() || var->type->contains_image()) {
    var->data.bindless = qual->flags.q.bindless_sampler ||
                         qual->flags.q.bindless_image ||
                         state->bindless_sampler_specified ||
                         state->bindless_image_specified;

    var->data.bound = qual->flags.q.bound_sampler ||
                      qual->flags.q.bound_image ||
                      state->bound_sampler_specified ||
                      state->bound_image_specified;
 }
3654}

3656static void
3657apply_layout_qualifier_to_variable(const struct ast_type_qualifier *qual,
                                 ir_variable *var,
                                 struct _mesa_glsl_parse_state *state,
                                 YYLTYPE *loc)
3661{
 if (var->name != NULL__null && strcmp(var->name, "gl_FragCoord") == 0) {

    /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
     *
     *    "Within any shader, the first redeclarations of gl_FragCoord
     *     must appear before any use of gl_FragCoord."
     *
     * Generate a compiler error if above condition is not met by the
     * fragment shader.
     */
    ir_variable *earlier = state->symbols->get_variable("gl_FragCoord");
    if (earlier != NULL__null &&
        earlier->data.used &&
        !state->fs_redeclares_gl_fragcoord) {
       _mesa_glsl_error(loc, state,
                        "gl_FragCoord used before its first redeclaration "
                        "in fragment shader");
    }

    /* Make sure all gl_FragCoord redeclarations specify the same layout
     * qualifiers.
     */
    if (is_conflicting_fragcoord_redeclaration(state, qual)) {
       const char *const qual_string =
          get_layout_qualifier_string(qual->flags.q.origin_upper_left,
                                      qual->flags.q.pixel_center_integer);

       const char *const state_string =
          get_layout_qualifier_string(state->fs_origin_upper_left,
                                      state->fs_pixel_center_integer);

       _mesa_glsl_error(loc, state,
                        "gl_FragCoord redeclared with different layout "
                        "qualifiers (%s) and (%s) ",
                        state_string,
                        qual_string);
    }
    state->fs_origin_upper_left = qual->flags.q.origin_upper_left;
    state->fs_pixel_center_integer = qual->flags.q.pixel_center_integer;
    state->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers =
       !qual->flags.q.origin_upper_left && !qual->flags.q.pixel_center_integer;
    state->fs_redeclares_gl_fragcoord =
       state->fs_origin_upper_left ||
       state->fs_pixel_center_integer ||
       state->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers;
 }

 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer)
     && (strcmp(var->name, "gl_FragCoord") != 0)) {
    const char *const qual_string = (qual->flags.q.origin_upper_left)
       ? "origin_upper_left" : "pixel_center_integer";

    _mesa_glsl_error(loc, state,
                     "layout qualifier `%s' can only be applied to "
                     "fragment shader input `gl_FragCoord'",
                     qual_string);
 }

 if (qual->flags.q.explicit_location) {
    apply_explicit_location(qual, var, state, loc);

    if (qual->flags.q.explicit_component) {
       unsigned qual_component;
       if (process_qualifier_constant(state, loc, "component",
                                      qual->component, &qual_component)) {
          const glsl_type *type = var->type->without_array();
          unsigned components = type->component_slots();

          if (type->is_matrix() || type->is_struct()) {
             _mesa_glsl_error(loc, state, "component layout qualifier "
                              "cannot be applied to a matrix, a structure, "
                              "a block, or an array containing any of "
                              "these.");
          } else if (components > 4 && type->is_64bit()) {
             _mesa_glsl_error(loc, state, "component layout qualifier "
                              "cannot be applied to dvec%u.",
                              components / 2);
          } else if (qual_component != 0 &&
              (qual_component + components - 1) > 3) {
             _mesa_glsl_error(loc, state, "component overflow (%u > 3)",
                              (qual_component + components - 1));
          } else if (qual_component == 1 && type->is_64bit()) {
             /* We don't bother checking for 3 as it should be caught by the
              * overflow check above.
              */
             _mesa_glsl_error(loc, state, "doubles cannot begin at "
                              "component 1 or 3");
          } else {
             var->data.explicit_component = true;
             var->data.location_frac = qual_component;
          }
       }
    }
 } else if (qual->flags.q.explicit_index) {
    if (!qual->subroutine_list)
       _mesa_glsl_error(loc, state,
                        "explicit index requires explicit location");
 } else if (qual->flags.q.explicit_component) {
    _mesa_glsl_error(loc, state,
                     "explicit component requires explicit location");
 }

 if (qual->flags.q.explicit_binding) {
    apply_explicit_binding(state, loc, var, var->type, qual);
 }

 if (state->stage == MESA_SHADER_GEOMETRY &&
     qual->flags.q.out && qual->flags.q.stream) {
    unsigned qual_stream;
    if (process_qualifier_constant(state, loc, "stream", qual->stream,
                                   &qual_stream) &&
        validate_stream_qualifier(loc, state, qual_stream)) {
       var->data.stream = qual_stream;
    }
 }

 if (qual->flags.q.out && qual->flags.q.xfb_buffer) {
    unsigned qual_xfb_buffer;
    if (process_qualifier_constant(state, loc, "xfb_buffer",
                                   qual->xfb_buffer, &qual_xfb_buffer) &&
        validate_xfb_buffer_qualifier(loc, state, qual_xfb_buffer)) {
       var->data.xfb_buffer = qual_xfb_buffer;
       if (qual->flags.q.explicit_xfb_buffer)
          var->data.explicit_xfb_buffer = true;
    }
 }

 if (qual->flags.q.explicit_xfb_offset) {
    unsigned qual_xfb_offset;
    unsigned component_size = var->type->contains_double() ? 8 : 4;

    if (process_qualifier_constant(state, loc, "xfb_offset",
                                   qual->offset, &qual_xfb_offset) &&
        validate_xfb_offset_qualifier(loc, state, (int) qual_xfb_offset,
                                      var->type, component_size)) {
       var->data.offset = qual_xfb_offset;
       var->data.explicit_xfb_offset = true;
    }
 }

 if (qual->flags.q.explicit_xfb_stride) {
    unsigned qual_xfb_stride;
    if (process_qualifier_constant(state, loc, "xfb_stride",
                                   qual->xfb_stride, &qual_xfb_stride)) {
       var->data.xfb_stride = qual_xfb_stride;
       var->data.explicit_xfb_stride = true;
    }
 }

 if (var->type->contains_atomic()) {
    if (var->data.mode == ir_var_uniform) {
       if (var->data.explicit_binding) {
          unsigned *offset =
             &state->atomic_counter_offsets[var->data.binding];

          if (*offset % ATOMIC_COUNTER_SIZE4)
             _mesa_glsl_error(loc, state,
                              "misaligned atomic counter offset");

          var->data.offset = *offset;
          *offset += var->type->atomic_size();

       } else {
          _mesa_glsl_error(loc, state,
                           "atomic counters require explicit binding point");
       }
    } else if (var->data.mode != ir_var_function_in) {
       _mesa_glsl_error(loc, state, "atomic counters may only be declared as "
                        "function parameters or uniform-qualified "
                        "global variables");
    }
 }

 if (var->type->contains_sampler() &&
     !validate_storage_for_sampler_image_types(var, state, loc))
    return;

 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
  * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
  * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
  * allowed the layout qualifier to be used with 'varying' and 'attribute'.
  * These extensions and all following extensions that add the 'layout'
  * keyword have been modified to require the use of 'in' or 'out'.
  *
  * The following extension do not allow the deprecated keywords:
  *
  *    GL_AMD_conservative_depth
  *    GL_ARB_conservative_depth
  *    GL_ARB_gpu_shader5
  *    GL_ARB_separate_shader_objects
  *    GL_ARB_tessellation_shader
  *    GL_ARB_transform_feedback3
  *    GL_ARB_uniform_buffer_object
  *
  * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
  * allow layout with the deprecated keywords.
  */
 const bool relaxed_layout_qualifier_checking =
    state->ARB_fragment_coord_conventions_enable;

 const bool uses_deprecated_qualifier = qual->flags.q.attribute
    || qual->flags.q.varying;
 if (qual->has_layout() && uses_deprecated_qualifier) {
    if (relaxed_layout_qualifier_checking) {
       _mesa_glsl_warning(loc, state,
                          "`layout' qualifier may not be used with "
                          "`attribute' or `varying'");
    } else {
       _mesa_glsl_error(loc, state,
                        "`layout' qualifier may not be used with "
                        "`attribute' or `varying'");
    }
 }

 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
  * AMD_conservative_depth.
  */
 if (qual->flags.q.depth_type
     && !state->is_version(420, 0)
     && !state->AMD_conservative_depth_enable
     && !state->ARB_conservative_depth_enable) {
     _mesa_glsl_error(loc, state,
                      "extension GL_AMD_conservative_depth or "
                      "GL_ARB_conservative_depth must be enabled "
                      "to use depth layout qualifiers");
 } else if (qual->flags.q.depth_type
            && strcmp(var->name, "gl_FragDepth") != 0) {
     _mesa_glsl_error(loc, state,
                      "depth layout qualifiers can be applied only to "
                      "gl_FragDepth");
 }

 switch (qual->depth_type) {
 case ast_depth_any:
    var->data.depth_layout = ir_depth_layout_any;
    break;
 case ast_depth_greater:
    var->data.depth_layout = ir_depth_layout_greater;
    break;
 case ast_depth_less:
    var->data.depth_layout = ir_depth_layout_less;
    break;
 case ast_depth_unchanged:
    var->data.depth_layout = ir_depth_layout_unchanged;
    break;
 default:
    var->data.depth_layout = ir_depth_layout_none;
    break;
 }

 if (qual->flags.q.std140 ||
     qual->flags.q.std430 ||
     qual->flags.q.packed ||
     qual->flags.q.shared) {
    _mesa_glsl_error(loc, state,
                     "uniform and shader storage block layout qualifiers "
                     "std140, std430, packed, and shared can only be "
                     "applied to uniform or shader storage blocks, not "
                     "members");
 }

 if (qual->flags.q.row_major || qual->flags.q.column_major) {
    validate_matrix_layout_for_type(state, loc, var->type, var);
 }

 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
  * Inputs):
  *
  *  "Fragment shaders also allow the following layout qualifier on in only
  *   (not with variable declarations)
  *     layout-qualifier-id
  *        early_fragment_tests
  *   [...]"
  */
 if (qual->flags.q.early_fragment_tests) {
    _mesa_glsl_error(loc, state, "early_fragment_tests layout qualifier only "
                     "valid in fragment shader input layout declaration.");
 }

 if (qual->flags.q.inner_coverage) {
    _mesa_glsl_error(loc, state, "inner_coverage layout qualifier only "
                     "valid in fragment shader input layout declaration.");
 }

 if (qual->flags.q.post_depth_coverage) {
    _mesa_glsl_error(loc, state, "post_depth_coverage layout qualifier only "
                     "valid in fragment shader input layout declaration.");
 }

 if (state->has_bindless())
    apply_bindless_qualifier_to_variable(qual, var, state, loc);

 if (qual->flags.q.pixel_interlock_ordered ||
     qual->flags.q.pixel_interlock_unordered ||
     qual->flags.q.sample_interlock_ordered ||
     qual->flags.q.sample_interlock_unordered) {
    _mesa_glsl_error(loc, state, "interlock layout qualifiers: "
                     "pixel_interlock_ordered, pixel_interlock_unordered, "
                     "sample_interlock_ordered and sample_interlock_unordered, "
                     "only valid in fragment shader input layout declaration.");
 }

 if (var->name != NULL__null && strcmp(var->name, "gl_Layer") == 0) {
    if (is_conflicting_layer_redeclaration(state, qual)) {
       _mesa_glsl_error(loc, state, "gl_Layer redeclaration with "
                        "different viewport_relative setting than earlier");
    }
    state->redeclares_gl_layer = 1;
    if (qual->flags.q.viewport_relative) {
       state->layer_viewport_relative = 1;
    }
 } else if (qual->flags.q.viewport_relative) {
    _mesa_glsl_error(loc, state,
                     "viewport_relative qualifier "
                     "can only be applied to gl_Layer.");
 }
3978}

3980static void
3981apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
                               ir_variable *var,
                               struct _mesa_glsl_parse_state *state,
                               YYLTYPE *loc,
                               bool is_parameter)
3986{
 STATIC_ASSERT(sizeof(qual->flags.q) <= sizeof(qual->flags.i))do { (void) sizeof(char [1 - 2*!(sizeof(qual->flags.q) <=
 sizeof(qual->flags.i))]); } while (0);

 if (qual->flags.q.invariant) {
    if (var->data.used) {
       _mesa_glsl_error(loc, state,
                        "variable `%s' may not be redeclared "
                        "`invariant' after being used",
                        var->name);
    } else {
       var->data.explicit_invariant = true;
       var->data.invariant = true;
    }
 }

 if (qual->flags.q.precise) {
    if (var->data.used) {
       _mesa_glsl_error(loc, state,
                        "variable `%s' may not be redeclared "
                        "`precise' after being used",
                        var->name);
    } else {
       var->data.precise = 1;
    }
 }

 if (qual->is_subroutine_decl() && !qual->flags.q.uniform) {
    _mesa_glsl_error(loc, state,
                     "`subroutine' may only be applied to uniforms, "
                     "subroutine type declarations, or function definitions");
 }

 if (qual->flags.q.constant || qual->flags.q.attribute
     || qual->flags.q.uniform
     || (qual->flags.q.varying && (state->stage == MESA_SHADER_FRAGMENT)))
    var->data.read_only = 1;

 if (qual->flags.q.centroid)
    var->data.centroid = 1;

 if (qual->flags.q.sample)
    var->data.sample = 1;

 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
 if (state->es_shader) {
    var->data.precision =
       select_gles_precision(qual->precision, var->type, state, loc);
 }

 if (qual->flags.q.patch)
    var->data.patch = 1;

 if (qual->flags.q.attribute && state->stage != MESA_SHADER_VERTEX) {
    var->type = glsl_type::error_type;
    _mesa_glsl_error(loc, state,
                     "`attribute' variables may not be declared in the "
                     "%s shader",
                     _mesa_shader_stage_to_string(state->stage));
 }

 /* Disallow layout qualifiers which may only appear on layout declarations. */
 if (qual->flags.q.prim_type) {
    _mesa_glsl_error(loc, state,
                     "Primitive type may only be specified on GS input or output "
                     "layout declaration, not on variables.");
 }

 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
  *
  *     "However, the const qualifier cannot be used with out or inout."
  *
  * The same section of the GLSL 4.40 spec further clarifies this saying:
  *
  *     "The const qualifier cannot be used with out or inout, or a
  *     compile-time error results."
  */
 if (is_parameter && qual->flags.q.constant && qual->flags.q.out) {
    _mesa_glsl_error(loc, state,
                     "`const' may not be applied to `out' or `inout' "
                     "function parameters");
 }

 /* If there is no qualifier that changes the mode of the variable, leave
  * the setting alone.
  */
 assert(var->data.mode != ir_var_temporary)(static_cast <bool> (var->data.mode != ir_var_temporary
) ? void (0) : __assert_fail ("var->data.mode != ir_var_temporary"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
 if (qual->flags.q.in && qual->flags.q.out)
    var->data.mode = is_parameter ? ir_var_function_inout : ir_var_shader_out;
 else if (qual->flags.q.in)
    var->data.mode = is_parameter ? ir_var_function_in : ir_var_shader_in;
 else if (qual->flags.q.attribute
          || (qual->flags.q.varying && (state->stage == MESA_SHADER_FRAGMENT)))
    var->data.mode = ir_var_shader_in;
 else if (qual->flags.q.out)
    var->data.mode = is_parameter ? ir_var_function_out : ir_var_shader_out;
 else if (qual->flags.q.varying && (state->stage == MESA_SHADER_VERTEX))
    var->data.mode = ir_var_shader_out;
 else if (qual->flags.q.uniform)
    var->data.mode = ir_var_uniform;
 else if (qual->flags.q.buffer)
    var->data.mode = ir_var_shader_storage;
 else if (qual->flags.q.shared_storage)
    var->data.mode = ir_var_shader_shared;

 if (!is_parameter && state->has_framebuffer_fetch() &&
     state->stage == MESA_SHADER_FRAGMENT) {
    if (state->is_version(130, 300))
       var->data.fb_fetch_output = qual->flags.q.in && qual->flags.q.out;
    else
       var->data.fb_fetch_output = (strcmp(var->name, "gl_LastFragData") == 0);
 }

 if (var->data.fb_fetch_output) {
    var->data.assigned = true;
    var->data.memory_coherent = !qual->flags.q.non_coherent;

    /* From the EXT_shader_framebuffer_fetch spec:
     *
     *   "It is an error to declare an inout fragment output not qualified
     *    with layout(noncoherent) if the GL_EXT_shader_framebuffer_fetch
     *    extension hasn't been enabled."
     */
    if (var->data.memory_coherent &&
        !state->EXT_shader_framebuffer_fetch_enable)
       _mesa_glsl_error(loc, state,
                        "invalid declaration of framebuffer fetch output not "
                        "qualified with layout(noncoherent)");

 } else {
    /* From the EXT_shader_framebuffer_fetch spec:
     *
     *   "Fragment outputs declared inout may specify the following layout
     *    qualifier: [...] noncoherent"
     */
    if (qual->flags.q.non_coherent)
       _mesa_glsl_error(loc, state,
                        "invalid layout(noncoherent) qualifier not part of "
                        "framebuffer fetch output declaration");
 }

 if (!is_parameter && is_varying_var(var, state->stage)) {
    /* User-defined ins/outs are not permitted in compute shaders. */
    if (state->stage == MESA_SHADER_COMPUTE) {
       _mesa_glsl_error(loc, state,
                        "user-defined input and output variables are not "
                        "permitted in compute shaders");
    }

    /* This variable is being used to link data between shader stages (in
     * pre-glsl-1.30 parlance, it's a "varying").  Check that it has a type
     * that is allowed for such purposes.
     *
     * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
     *
     *     "The varying qualifier can be used only with the data types
     *     float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
     *     these."
     *
     * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00.  From
     * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
     *
     *     "Fragment inputs can only be signed and unsigned integers and
     *     integer vectors, float, floating-point vectors, matrices, or
     *     arrays of these. Structures cannot be input.
     *
     * Similar text exists in the section on vertex shader outputs.
     *
     * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
     * 3.00 spec allows structs as well.  Varying structs are also allowed
     * in GLSL 1.50.
     *
     * From section 4.3.4 of the ARB_bindless_texture spec:
     *
     *     "(modify third paragraph of the section to allow sampler and image
     *     types) ...  Vertex shader inputs can only be float,
     *     single-precision floating-point scalars, single-precision
     *     floating-point vectors, matrices, signed and unsigned integers
     *     and integer vectors, sampler and image types."
     *
     * From section 4.3.6 of the ARB_bindless_texture spec:
     *
     *     "Output variables can only be floating-point scalars,
     *     floating-point vectors, matrices, signed or unsigned integers or
     *     integer vectors, sampler or image types, or arrays or structures
     *     of any these."
     */
    switch (var->type->without_array()->base_type) {
    case GLSL_TYPE_FLOAT:
       /* Ok in all GLSL versions */
       break;
    case GLSL_TYPE_UINT:
    case GLSL_TYPE_INT:
       if (state->is_version(130, 300) || state->EXT_gpu_shader4_enable)
          break;
       _mesa_glsl_error(loc, state,
                        "varying variables must be of base type float in %s",
                        state->get_version_string());
       break;
    case GLSL_TYPE_STRUCT:
       if (state->is_version(150, 300))
          break;
       _mesa_glsl_error(loc, state,
                        "varying variables may not be of type struct");
       break;
    case GLSL_TYPE_DOUBLE:
    case GLSL_TYPE_UINT64:
    case GLSL_TYPE_INT64:
       break;
    case GLSL_TYPE_SAMPLER:
    case GLSL_TYPE_IMAGE:
       if (state->has_bindless())
          break;
       /* fallthrough */
    default:
       _mesa_glsl_error(loc, state, "illegal type for a varying variable");
       break;
    }
 }

 if (state->all_invariant && var->data.mode == ir_var_shader_out) {
    var->data.explicit_invariant = true;
    var->data.invariant = true;
 }

 var->data.interpolation =
    interpret_interpolation_qualifier(qual, var->type,
                                      (ir_variable_mode) var->data.mode,
                                      state, loc);

 /* Does the declaration use the deprecated 'attribute' or 'varying'
  * keywords?
  */
 const bool uses_deprecated_qualifier = qual->flags.q.attribute
    || qual->flags.q.varying;


 /* Validate auxiliary storage qualifiers */

 /* From section 4.3.4 of the GLSL 1.30 spec:
  *    "It is an error to use centroid in in a vertex shader."
  *
  * From section 4.3.4 of the GLSL ES 3.00 spec:
  *    "It is an error to use centroid in or interpolation qualifiers in
  *    a vertex shader input."
  */

 /* Section 4.3.6 of the GLSL 1.30 specification states:
  * "It is an error to use centroid out in a fragment shader."
  *
  * The GL_ARB_shading_language_420pack extension specification states:
  * "It is an error to use auxiliary storage qualifiers or interpolation
  *  qualifiers on an output in a fragment shader."
  */
 if (qual->flags.q.sample && (!is_varying_var(var, state->stage) || uses_deprecated_qualifier)) {
    _mesa_glsl_error(loc, state,
                     "sample qualifier may only be used on `in` or `out` "
                     "variables between shader stages");
 }
 if (qual->flags.q.centroid && !is_varying_var(var, state->stage)) {
    _mesa_glsl_error(loc, state,
                     "centroid qualifier may only be used with `in', "
                     "`out' or `varying' variables between shader stages");
 }

 if (qual->flags.q.shared_storage && state->stage != MESA_SHADER_COMPUTE) {
    _mesa_glsl_error(loc, state,
                     "the shared storage qualifiers can only be used with "
                     "compute shaders");
 }

 apply_image_qualifier_to_variable(qual, var, state, loc);
4257}

4259/**
* Get the variable that is being redeclared by this declaration or if it
* does not exist, the current declared variable.
*
* Semantic checks to verify the validity of the redeclaration are also
* performed.  If semantic checks fail, compilation error will be emitted via
* \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
*
* \returns
* A pointer to an existing variable in the current scope if the declaration
* is a redeclaration, current variable otherwise. \c is_declared boolean
* will return \c true if the declaration is a redeclaration, \c false
* otherwise.
*/
4273static ir_variable *
4274get_variable_being_redeclared(ir_variable **var_ptr, YYLTYPE loc,
                            struct _mesa_glsl_parse_state *state,
                            bool allow_all_redeclarations,
                            bool *is_redeclaration)
4278{
 ir_variable *var = *var_ptr;

 /* Check if this declaration is actually a re-declaration, either to
  * resize an array or add qualifiers to an existing variable.
  *
  * This is allowed for variables in the current scope, or when at
  * global scope (for built-ins in the implicit outer scope).
  */
 ir_variable *earlier = state->symbols->get_variable(var->name);
 if (earlier == NULL__null ||
     (state->current_function != NULL__null &&
     !state->symbols->name_declared_this_scope(var->name))) {
    *is_redeclaration = false;
    return var;
 }

 *is_redeclaration = true;

 if (earlier->data.how_declared == ir_var_declared_implicitly) {
    /* Verify that the redeclaration of a built-in does not change the
     * storage qualifier.  There are a couple special cases.
     *
     * 1. Some built-in variables that are defined as 'in' in the
     *    specification are implemented as system values.  Allow
     *    ir_var_system_value -> ir_var_shader_in.
     *
     * 2. gl_LastFragData is implemented as a ir_var_shader_out, but the
     *    specification requires that redeclarations omit any qualifier.
     *    Allow ir_var_shader_out -> ir_var_auto for this one variable.
     */
    if (earlier->data.mode != var->data.mode &&
        !(earlier->data.mode == ir_var_system_value &&
          var->data.mode == ir_var_shader_in) &&
        !(strcmp(var->name, "gl_LastFragData") == 0 &&
          var->data.mode == ir_var_auto)) {
       _mesa_glsl_error(&loc, state,
                        "redeclaration cannot change qualification of `%s'",
                        var->name);
    }
 }

 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
  *
  * "It is legal to declare an array without a size and then
  *  later re-declare the same name as an array of the same
  *  type and specify a size."
  */
 if (earlier->type->is_unsized_array() && var->type->is_array()
     && (var->type->fields.array == earlier->type->fields.array)) {
    const int size = var->type->array_size();
    check_builtin_array_max_size(var->name, size, loc, state);
    if ((size > 0) && (size <= earlier->data.max_array_access)) {
       _mesa_glsl_error(& loc, state, "array size must be > %u due to "
                        "previous access",
                        earlier->data.max_array_access);
    }

    earlier->type = var->type;
    delete var;
    var = NULL__null;
    *var_ptr = NULL__null;
 } else if (earlier->type != var->type) {
    _mesa_glsl_error(&loc, state,
                     "redeclaration of `%s' has incorrect type",
                     var->name);
 } else if ((state->ARB_fragment_coord_conventions_enable ||
            state->is_version(150, 0))
            && strcmp(var->name, "gl_FragCoord") == 0) {
    /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
     * qualifiers.
     *
     * We don't really need to do anything here, just allow the
     * redeclaration. Any error on the gl_FragCoord is handled on the ast
     * level at apply_layout_qualifier_to_variable using the
     * ast_type_qualifier and _mesa_glsl_parse_state, or later at
     * linker.cpp.
     */
    /* According to section 4.3.7 of the GLSL 1.30 spec,
     * the following built-in varaibles can be redeclared with an
     * interpolation qualifier:
     *    * gl_FrontColor
     *    * gl_BackColor
     *    * gl_FrontSecondaryColor
     *    * gl_BackSecondaryColor
     *    * gl_Color
     *    * gl_SecondaryColor
     */
 } else if (state->is_version(130, 0)
            && (strcmp(var->name, "gl_FrontColor") == 0
                || strcmp(var->name, "gl_BackColor") == 0
                || strcmp(var->name, "gl_FrontSecondaryColor") == 0
                || strcmp(var->name, "gl_BackSecondaryColor") == 0
                || strcmp(var->name, "gl_Color") == 0
                || strcmp(var->name, "gl_SecondaryColor") == 0)) {
    earlier->data.interpolation = var->data.interpolation;

    /* Layout qualifiers for gl_FragDepth. */
 } else if ((state->is_version(420, 0) ||
             state->AMD_conservative_depth_enable ||
             state->ARB_conservative_depth_enable)
            && strcmp(var->name, "gl_FragDepth") == 0) {

    /** From the AMD_conservative_depth spec:
     *     Within any shader, the first redeclarations of gl_FragDepth
     *     must appear before any use of gl_FragDepth.
     */
    if (earlier->data.used) {
       _mesa_glsl_error(&loc, state,
                        "the first redeclaration of gl_FragDepth "
                        "must appear before any use of gl_FragDepth");
    }

    /* Prevent inconsistent redeclaration of depth layout qualifier. */
    if (earlier->data.depth_layout != ir_depth_layout_none
        && earlier->data.depth_layout != var->data.depth_layout) {
          _mesa_glsl_error(&loc, state,
                           "gl_FragDepth: depth layout is declared here "
                           "as '%s, but it was previously declared as "
                           "'%s'",
                           depth_layout_string(var->data.depth_layout),
                           depth_layout_string(earlier->data.depth_layout));
    }

    earlier->data.depth_layout = var->data.depth_layout;

 } else if (state->has_framebuffer_fetch() &&
            strcmp(var->name, "gl_LastFragData") == 0 &&
            var->data.mode == ir_var_auto) {
    /* According to the EXT_shader_framebuffer_fetch spec:
     *
     *   "By default, gl_LastFragData is declared with the mediump precision
     *    qualifier. This can be changed by redeclaring the corresponding
     *    variables with the desired precision qualifier."
     *
     *   "Fragment shaders may specify the following layout qualifier only for
     *    redeclaring the built-in gl_LastFragData array [...]: noncoherent"
     */
    earlier->data.precision = var->data.precision;
    earlier->data.memory_coherent = var->data.memory_coherent;

 } else if (state->NV_viewport_array2_enable &&
            strcmp(var->name, "gl_Layer") == 0 &&
            earlier->data.how_declared == ir_var_declared_implicitly) {
    /* No need to do anything, just allow it. Qualifier is stored in state */

 } else if ((earlier->data.how_declared == ir_var_declared_implicitly &&
             state->allow_builtin_variable_redeclaration) ||
            allow_all_redeclarations) {
    /* Allow verbatim redeclarations of built-in variables. Not explicitly
     * valid, but some applications do it.
     */
 } else {
    _mesa_glsl_error(&loc, state, "`%s' redeclared", var->name);
 }

 return earlier;
4435}

4437/**
* Generate the IR for an initializer in a variable declaration
*/
4440static ir_rvalue *
4441process_initializer(ir_variable *var, ast_declaration *decl,
                  ast_fully_specified_type *type,
                  exec_list *initializer_instructions,
                  struct _mesa_glsl_parse_state *state)
4445{
 void *mem_ctx = state;
 ir_rvalue *result = NULL__null;

 YYLTYPE initializer_loc = decl->initializer->get_location();

 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
  *
  *    "All uniform variables are read-only and are initialized either
  *    directly by an application via API commands, or indirectly by
  *    OpenGL."
  */
 if (var->data.mode == ir_var_uniform) {
    state->check_version(120, 0, &initializer_loc,
                         "cannot initialize uniform %s",
                         var->name);
 }

 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
  *
  *    "Buffer variables cannot have initializers."
  */
 if (var->data.mode == ir_var_shader_storage) {
    _mesa_glsl_error(&initializer_loc, state,
                     "cannot initialize buffer variable %s",
                     var->name);
 }

 /* From section 4.1.7 of the GLSL 4.40 spec:
  *
  *    "Opaque variables [...] are initialized only through the
  *     OpenGL API; they cannot be declared with an initializer in a
  *     shader."
  *
  * From section 4.1.7 of the ARB_bindless_texture spec:
  *
  *    "Samplers may be declared as shader inputs and outputs, as uniform
  *     variables, as temporary variables, and as function parameters."
  *
  * From section 4.1.X of the ARB_bindless_texture spec:
  *
  *    "Images may be declared as shader inputs and outputs, as uniform
  *     variables, as temporary variables, and as function parameters."
  */
 if (var->type->contains_atomic() ||
     (!state->has_bindless() && var->type->contains_opaque())) {
    _mesa_glsl_error(&initializer_loc, state,
                     "cannot initialize %s variable %s",
                     var->name, state->has_bindless() ? "atomic" : "opaque");
 }

 if ((var->data.mode == ir_var_shader_in) && (state->current_function == NULL__null)) {
    _mesa_glsl_error(&initializer_loc, state,
                     "cannot initialize %s shader input / %s %s",
                     _mesa_shader_stage_to_string(state->stage),
                     (state->stage == MESA_SHADER_VERTEX)
                     ? "attribute" : "varying",
                     var->name);
 }

 if (var->data.mode == ir_var_shader_out && state->current_function == NULL__null) {
    _mesa_glsl_error(&initializer_loc, state,
                     "cannot initialize %s shader output %s",
                     _mesa_shader_stage_to_string(state->stage),
                     var->name);
 }

 /* If the initializer is an ast_aggregate_initializer, recursively store
  * type information from the LHS into it, so that its hir() function can do
  * type checking.
  */
 if (decl->initializer->oper == ast_aggregate)
    _mesa_ast_set_aggregate_type(var->type, decl->initializer);

 ir_dereference *const lhs = new(state) ir_dereference_variable(var);
 ir_rvalue *rhs = decl->initializer->hir(initializer_instructions, state);

 /* Calculate the constant value if this is a const or uniform
  * declaration.
  *
  * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
  *
  *     "Declarations of globals without a storage qualifier, or with
  *     just the const qualifier, may include initializers, in which case
  *     they will be initialized before the first line of main() is
  *     executed.  Such initializers must be a constant expression."
  *
  * The same section of the GLSL ES 3.00.4 spec has similar language.
  */
 if (type->qualifier.flags.q.constant
     || type->qualifier.flags.q.uniform
     || (state->es_shader && state->current_function == NULL__null)) {
    ir_rvalue *new_rhs = validate_assignment(state, initializer_loc,
                                             lhs, rhs, true);
    if (new_rhs != NULL__null) {
       rhs = new_rhs;

       /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
        * says:
        *
        *     "A constant expression is one of
        *
        *        ...
        *
        *        - an expression formed by an operator on operands that are
        *          all constant expressions, including getting an element of
        *          a constant array, or a field of a constant structure, or
        *          components of a constant vector.  However, the sequence
        *          operator ( , ) and the assignment operators ( =, +=, ...)
        *          are not included in the operators that can create a
        *          constant expression."
        *
        * Section 12.43 (Sequence operator and constant expressions) says:
        *
        *     "Should the following construct be allowed?
        *
        *         float a[2,3];
        *
        *     The expression within the brackets uses the sequence operator
        *     (',') and returns the integer 3 so the construct is declaring
        *     a single-dimensional array of size 3.  In some languages, the
        *     construct declares a two-dimensional array.  It would be
        *     preferable to make this construct illegal to avoid confusion.
        *
        *     One possibility is to change the definition of the sequence
        *     operator so that it does not return a constant-expression and
        *     hence cannot be used to declare an array size.
        *
        *     RESOLUTION: The result of a sequence operator is not a
        *     constant-expression."
        *
        * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
        * contains language almost identical to the section 4.3.3 in the
        * GLSL ES 3.00.4 spec.  This is a new limitation for these GLSL
        * versions.
        */
       ir_constant *constant_value =
          rhs->constant_expression_value(mem_ctx);

       if (!constant_value ||
           (state->is_version(430, 300) &&
            decl->initializer->has_sequence_subexpression())) {
          const char *const variable_mode =
             (type->qualifier.flags.q.constant)
             ? "const"
             : ((type->qualifier.flags.q.uniform) ? "uniform" : "global");

          /* If ARB_shading_language_420pack is enabled, initializers of
           * const-qualified local variables do not have to be constant
           * expressions. Const-qualified global variables must still be
           * initialized with constant expressions.
           */
          if (!state->has_420pack()
              || state->current_function == NULL__null) {
             _mesa_glsl_error(& initializer_loc, state,
                              "initializer of %s variable `%s' must be a "
                              "constant expression",
                              variable_mode,
                              decl->identifier);
             if (var->type->is_numeric()) {
                /* Reduce cascading errors. */
                var->constant_value = type->qualifier.flags.q.constant
                   ? ir_constant::zero(state, var->type) : NULL__null;
             }
          }
       } else {
          rhs = constant_value;
          var->constant_value = type->qualifier.flags.q.constant
             ? constant_value : NULL__null;
       }
    } else {
       if (var->type->is_numeric()) {
          /* Reduce cascading errors. */
          rhs = var->constant_value = type->qualifier.flags.q.constant
             ? ir_constant::zero(state, var->type) : NULL__null;
       }
    }
 }

 if (rhs && !rhs->type->is_error()) {
    bool temp = var->data.read_only;
    if (type->qualifier.flags.q.constant)
       var->data.read_only = false;

    /* Never emit code to initialize a uniform.
     */
    const glsl_type *initializer_type;
    bool error_emitted = false;
    if (!type->qualifier.flags.q.uniform) {
       error_emitted =
          do_assignment(initializer_instructions, state,
                        NULL__null, lhs, rhs,
                        &result, true, true,
                        type->get_location());
       initializer_type = result->type;
    } else
       initializer_type = rhs->type;

    if (!error_emitted) {
       var->constant_initializer = rhs->constant_expression_value(mem_ctx);
       var->data.has_initializer = true;

       /* If the declared variable is an unsized array, it must inherrit
       * its full type from the initializer.  A declaration such as
       *
       *     uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
       *
       * becomes
       *
       *     uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
       *
       * The assignment generated in the if-statement (below) will also
       * automatically handle this case for non-uniforms.
       *
       * If the declared variable is not an array, the types must
       * already match exactly.  As a result, the type assignment
       * here can be done unconditionally.  For non-uniforms the call
       * to do_assignment can change the type of the initializer (via
       * the implicit conversion rules).  For uniforms the initializer
       * must be a constant expression, and the type of that expression
       * was validated above.
       */
       var->type = initializer_type;
    }

    var->data.read_only = temp;
 }

 return result;
4674}

4676static void
4677validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state *state,
                                     YYLTYPE loc, ir_variable *var,
                                     unsigned num_vertices,
                                     unsigned *size,
                                     const char *var_category)
4682{
 if (var->type->is_unsized_array()) {
    /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
     *
     *   All geometry shader input unsized array declarations will be
     *   sized by an earlier input layout qualifier, when present, as per
     *   the following table.
     *
     * Followed by a table mapping each allowed input layout qualifier to
     * the corresponding input length.
     *
     * Similarly for tessellation control shader outputs.
     */
    if (num_vertices != 0)
       var->type = glsl_type::get_array_instance(var->type->fields.array,
                                                 num_vertices);
 } else {
    /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
     * includes the following examples of compile-time errors:
     *
     *   // code sequence within one shader...
     *   in vec4 Color1[];    // size unknown
     *   ...Color1.length()...// illegal, length() unknown
     *   in vec4 Color2[2];   // size is 2
     *   ...Color1.length()...// illegal, Color1 still has no size
     *   in vec4 Color3[3];   // illegal, input sizes are inconsistent
     *   layout(lines) in;    // legal, input size is 2, matching
     *   in vec4 Color4[3];   // illegal, contradicts layout
     *   ...
     *
     * To detect the case illustrated by Color3, we verify that the size of
     * an explicitly-sized array matches the size of any previously declared
     * explicitly-sized array.  To detect the case illustrated by Color4, we
     * verify that the size of an explicitly-sized array is consistent with
     * any previously declared input layout.
     */
    if (num_vertices != 0 && var->type->length != num_vertices) {
       _mesa_glsl_error(&loc, state,
                        "%s size contradicts previously declared layout "
                        "(size is %u, but layout requires a size of %u)",
                        var_category, var->type->length, num_vertices);
    } else if (*size != 0 && var->type->length != *size) {
       _mesa_glsl_error(&loc, state,
                        "%s sizes are inconsistent (size is %u, but a "
                        "previous declaration has size %u)",
                        var_category, var->type->length, *size);
    } else {
       *size = var->type->length;
    }
 }
4732}

4734static void
4735handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state *state,
                                  YYLTYPE loc, ir_variable *var)
4737{
 unsigned num_vertices = 0;

 if (state->tcs_output_vertices_specified) {
    if (!state->out_qualifier->vertices->
           process_qualifier_constant(state, "vertices",
                                      &num_vertices, false)) {
       return;
    }

    if (num_vertices > state->Const.MaxPatchVertices) {
       _mesa_glsl_error(&loc, state, "vertices (%d) exceeds "
                        "GL_MAX_PATCH_VERTICES", num_vertices);
       return;
    }
 }

 if (!var->type->is_array() && !var->data.patch) {
    _mesa_glsl_error(&loc, state,
                     "tessellation control shader outputs must be arrays");

    /* To avoid cascading failures, short circuit the checks below. */
    return;
 }

 if (var->data.patch)
    return;

 validate_layout_qualifier_vertex_count(state, loc, var, num_vertices,
                                        &state->tcs_output_size,
                                        "tessellation control shader output");
4768}

4770/**
* Do additional processing necessary for tessellation control/evaluation shader
* input declarations. This covers both interface block arrays and bare input
* variables.
*/
4775static void
4776handle_tess_shader_input_decl(struct _mesa_glsl_parse_state *state,
                            YYLTYPE loc, ir_variable *var)
4778{
 if (!var->type->is_array() && !var->data.patch) {
    _mesa_glsl_error(&loc, state,
                     "per-vertex tessellation shader inputs must be arrays");
    /* Avoid cascading failures. */
    return;
 }

 if (var->data.patch)
    return;

 /* The ARB_tessellation_shader spec says:
  *
  *    "Declaring an array size is optional.  If no size is specified, it
  *     will be taken from the implementation-dependent maximum patch size
  *     (gl_MaxPatchVertices).  If a size is specified, it must match the
  *     maximum patch size; otherwise, a compile or link error will occur."
  *
  * This text appears twice, once for TCS inputs, and again for TES inputs.
  */
 if (var->type->is_unsized_array()) {
    var->type = glsl_type::get_array_instance(var->type->fields.array,
          state->Const.MaxPatchVertices);
 } else if (var->type->length != state->Const.MaxPatchVertices) {
    _mesa_glsl_error(&loc, state,
                     "per-vertex tessellation shader input arrays must be "
                     "sized to gl_MaxPatchVertices (%d).",
                     state->Const.MaxPatchVertices);
 }
4807}


4810/**
* Do additional processing necessary for geometry shader input declarations
* (this covers both interface blocks arrays and bare input variables).
*/
4814static void
4815handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state *state,
                                YYLTYPE loc, ir_variable *var)
4817{
 unsigned num_vertices = 0;

 if (state->gs_input_prim_type_specified) {
    num_vertices = vertices_per_prim(state->in_qualifier->prim_type);
 }

 /* Geometry shader input variables must be arrays.  Caller should have
  * reported an error for this.
  */
 if (!var->type->is_array()) {
    assert(state->error)(static_cast <bool> (state->error) ? void (0) : __assert_fail
 ("state->error", __builtin_FILE (), __builtin_LINE (), __extension__
 __PRETTY_FUNCTION__));

    /* To avoid cascading failures, short circuit the checks below. */
    return;
 }

 validate_layout_qualifier_vertex_count(state, loc, var, num_vertices,
                                        &state->gs_input_size,
                                        "geometry shader input");
4837}

4839static void
4840validate_identifier(const char *identifier, YYLTYPE loc,
                  struct _mesa_glsl_parse_state *state)
4842{
 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
  *
  *   "Identifiers starting with "gl_" are reserved for use by
  *   OpenGL, and may not be declared in a shader as either a
  *   variable or a function."
  */
 if (is_gl_identifier(identifier)) {
    _mesa_glsl_error(&loc, state,
                     "identifier `%s' uses reserved `gl_' prefix",
                     identifier);
 } else if (strstr(identifier, "__")) {
    /* From page 14 (page 20 of the PDF) of the GLSL 1.10
     * spec:
     *
     *     "In addition, all identifiers containing two
     *      consecutive underscores (__) are reserved as
     *      possible future keywords."
     *
     * The intention is that names containing __ are reserved for internal
     * use by the implementation, and names prefixed with GL_ are reserved
     * for use by Khronos.  Names simply containing __ are dangerous to use,
     * but should be allowed.
     *
     * A future version of the GLSL specification will clarify this.
     */
    _mesa_glsl_warning(&loc, state,
                       "identifier `%s' uses reserved `__' string",
                       identifier);
 }
4872}

4874ir_rvalue *
4875ast_declarator_list::hir(exec_list *instructions,
                       struct _mesa_glsl_parse_state *state)
4877{
 void *ctx = state;
 const struct glsl_type *decl_type;
 const char *type_name = NULL__null;
 ir_rvalue *result = NULL__null;
 YYLTYPE loc = this->get_location();

 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
  *
  *     "To ensure that a particular output variable is invariant, it is
  *     necessary to use the invariant qualifier. It can either be used to
  *     qualify a previously declared variable as being invariant
  *
  *         invariant gl_Position; // make existing gl_Position be invariant"
  *
  * In these cases the parser will set the 'invariant' flag in the declarator
  * list, and the type will be NULL.
  */
 if (this->invariant) {
    assert(this->type == NULL)(static_cast <bool> (this->type == __null) ? void (0
) : __assert_fail ("this->type == NULL", __builtin_FILE ()
, __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

    if (state->current_function != NULL__null) {
       _mesa_glsl_error(& loc, state,
                        "all uses of `invariant' keyword must be at global "
                        "scope");
    }

    foreach_list_typed (ast_declaration, decl, link, &this->declarations)for (ast_declaration * decl = (!exec_node_is_tail_sentinel((&
this->declarations)->head_sentinel.next) ? ((ast_declaration
 *) (((uintptr_t) (&this->declarations)->head_sentinel
.next) - (((char *) &((ast_declaration *) (&this->
declarations)->head_sentinel.next)->link) - ((char *) (
&this->declarations)->head_sentinel.next)))) : __null
); (decl) != __null; (decl) = (!exec_node_is_tail_sentinel((decl
)->link.next) ? ((ast_declaration *) (((uintptr_t) (decl)->
link.next) - (((char *) &((ast_declaration *) (decl)->
link.next)->link) - ((char *) (decl)->link.next)))) : __null
)) {
       assert(decl->array_specifier == NULL)(static_cast <bool> (decl->array_specifier == __null
) ? void (0) : __assert_fail ("decl->array_specifier == NULL"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
       assert(decl->initializer == NULL)(static_cast <bool> (decl->initializer == __null) ? void
 (0) : __assert_fail ("decl->initializer == NULL", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

       ir_variable *const earlier =
          state->symbols->get_variable(decl->identifier);
       if (earlier == NULL__null) {
          _mesa_glsl_error(& loc, state,
                           "undeclared variable `%s' cannot be marked "
                           "invariant", decl->identifier);
       } else if (!is_allowed_invariant(earlier, state)) {
          _mesa_glsl_error(&loc, state,
                           "`%s' cannot be marked invariant; interfaces between "
                           "shader stages only.", decl->identifier);
       } else if (earlier->data.used) {
          _mesa_glsl_error(& loc, state,
                          "variable `%s' may not be redeclared "
                          "`invariant' after being used",
                          earlier->name);
       } else {
          earlier->data.explicit_invariant = true;
          earlier->data.invariant = true;
       }
    }

    /* Invariant redeclarations do not have r-values.
     */
    return NULL__null;
 }

 if (this->precise) {
    assert(this->type == NULL)(static_cast <bool> (this->type == __null) ? void (0
) : __assert_fail ("this->type == NULL", __builtin_FILE ()
, __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

    foreach_list_typed (ast_declaration, decl, link, &this->declarations)for (ast_declaration * decl = (!exec_node_is_tail_sentinel((&
this->declarations)->head_sentinel.next) ? ((ast_declaration
 *) (((uintptr_t) (&this->declarations)->head_sentinel
.next) - (((char *) &((ast_declaration *) (&this->
declarations)->head_sentinel.next)->link) - ((char *) (
&this->declarations)->head_sentinel.next)))) : __null
); (decl) != __null; (decl) = (!exec_node_is_tail_sentinel((decl
)->link.next) ? ((ast_declaration *) (((uintptr_t) (decl)->
link.next) - (((char *) &((ast_declaration *) (decl)->
link.next)->link) - ((char *) (decl)->link.next)))) : __null
)) {
       assert(decl->array_specifier == NULL)(static_cast <bool> (decl->array_specifier == __null
) ? void (0) : __assert_fail ("decl->array_specifier == NULL"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
       assert(decl->initializer == NULL)(static_cast <bool> (decl->initializer == __null) ? void
 (0) : __assert_fail ("decl->initializer == NULL", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

       ir_variable *const earlier =
          state->symbols->get_variable(decl->identifier);
       if (earlier == NULL__null) {
          _mesa_glsl_error(& loc, state,
                           "undeclared variable `%s' cannot be marked "
                           "precise", decl->identifier);
       } else if (state->current_function != NULL__null &&
                  !state->symbols->name_declared_this_scope(decl->identifier)) {
          /* Note: we have to check if we're in a function, since
           * builtins are treated as having come from another scope.
           */
          _mesa_glsl_error(& loc, state,
                           "variable `%s' from an outer scope may not be "
                           "redeclared `precise' in this scope",
                           earlier->name);
       } else if (earlier->data.used) {
          _mesa_glsl_error(& loc, state,
                           "variable `%s' may not be redeclared "
                           "`precise' after being used",
                           earlier->name);
       } else {
          earlier->data.precise = true;
       }
    }

    /* Precise redeclarations do not have r-values either. */
    return NULL__null;
 }

 assert(this->type != NULL)(static_cast <bool> (this->type != __null) ? void (0
) : __assert_fail ("this->type != NULL", __builtin_FILE ()
, __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));
 assert(!this->invariant)(static_cast <bool> (!this->invariant) ? void (0) : __assert_fail
 ("!this->invariant", __builtin_FILE (), __builtin_LINE ()
, __extension__ __PRETTY_FUNCTION__));
 assert(!this->precise)(static_cast <bool> (!this->precise) ? void (0) : __assert_fail
 ("!this->precise", __builtin_FILE (), __builtin_LINE (), __extension__
 __PRETTY_FUNCTION__));

 /* GL_EXT_shader_image_load_store base type uses GLSL_TYPE_VOID as a special value to
  * indicate that it needs to be updated later (see glsl_parser.yy).
  * This is done here, based on the layout qualifier and the type of the image var
  */
 if (this->type->qualifier.flags.q.explicit_image_format &&
       this->type->specifier->type->is_image() &&
       this->type->qualifier.image_base_type == GLSL_TYPE_VOID) {
    /*     "The ARB_shader_image_load_store says:
     *     If both extensions are enabled in the shading language, the "size*" layout
     *     qualifiers are treated as format qualifiers, and are mapped to equivalent
     *     format qualifiers in the table below, according to the type of image
     *     variable.
     *                     image*    iimage*   uimage*
     *                     --------  --------  --------
     *       size1x8       n/a       r8i       r8ui
     *       size1x16      r16f      r16i      r16ui
     *       size1x32      r32f      r32i      r32ui
     *       size2x32      rg32f     rg32i     rg32ui
     *       size4x32      rgba32f   rgba32i   rgba32ui"
     */
    if (strncmp(this->type->specifier->type_name, "image", strlen("image")) == 0) {
       switch (this->type->qualifier.image_format) {
       case PIPE_FORMAT_R8_SINT:
          /* No valid qualifier in this case, driver will need to look at
           * the underlying image's format (just like no qualifier being
           * present).
           */
          this->type->qualifier.image_format = PIPE_FORMAT_NONE;
          break;
       case PIPE_FORMAT_R16_SINT:
          this->type->qualifier.image_format = PIPE_FORMAT_R16_FLOAT;
          break;
       case PIPE_FORMAT_R32_SINT:
          this->type->qualifier.image_format = PIPE_FORMAT_R32_FLOAT;
          break;
       case PIPE_FORMAT_R32G32_SINT:
          this->type->qualifier.image_format = PIPE_FORMAT_R32G32_FLOAT;
          break;
       case PIPE_FORMAT_R32G32B32A32_SINT:
          this->type->qualifier.image_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
          break;
       default:
          unreachable("Unknown image format")do { (static_cast <bool> (!"Unknown image format") ? void
 (0) : __assert_fail ("!\"Unknown image format\"", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__)); __builtin_unreachable
(); } while (0);
       }
       this->type->qualifier.image_base_type = GLSL_TYPE_FLOAT;
    } else if (strncmp(this->type->specifier->type_name, "uimage", strlen("uimage")) == 0) {
       switch (this->type->qualifier.image_format) {
       case PIPE_FORMAT_R8_SINT:
          this->type->qualifier.image_format = PIPE_FORMAT_R8_UINT;
          break;
       case PIPE_FORMAT_R16_SINT:
          this->type->qualifier.image_format = PIPE_FORMAT_R16_UINT;
          break;
       case PIPE_FORMAT_R32_SINT:
          this->type->qualifier.image_format = PIPE_FORMAT_R32_UINT;
          break;
       case PIPE_FORMAT_R32G32_SINT:
          this->type->qualifier.image_format = PIPE_FORMAT_R32G32_UINT;
          break;
       case PIPE_FORMAT_R32G32B32A32_SINT:
          this->type->qualifier.image_format = PIPE_FORMAT_R32G32B32A32_UINT;
          break;
       default:
          unreachable("Unknown image format")do { (static_cast <bool> (!"Unknown image format") ? void
 (0) : __assert_fail ("!\"Unknown image format\"", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__)); __builtin_unreachable
(); } while (0);
       }
       this->type->qualifier.image_base_type = GLSL_TYPE_UINT;
    } else if (strncmp(this->type->specifier->type_name, "iimage", strlen("iimage")) == 0) {
       this->type->qualifier.image_base_type = GLSL_TYPE_INT;
    } else {
       assert(false)(static_cast <bool> (false) ? void (0) : __assert_fail (
"false", __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
    }
 }

 /* The type specifier may contain a structure definition.  Process that
  * before any of the variable declarations.
  */
 (void) this->type->specifier->hir(instructions, state);

 decl_type = this->type->glsl_type(& type_name, state);

 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
  *    "Buffer variables may only be declared inside interface blocks
  *    (section 4.3.9 “Interface Blocks”), which are then referred to as
  *    shader storage blocks. It is a compile-time error to declare buffer
  *    variables at global scope (outside a block)."
  */
 if (type->qualifier.flags.q.buffer && !decl_type->is_interface()) {
    _mesa_glsl_error(&loc, state,
                     "buffer variables cannot be declared outside "
                     "interface blocks");
 }

 /* An offset-qualified atomic counter declaration sets the default
  * offset for the next declaration within the same atomic counter
  * buffer.
  */
 if (decl_type && decl_type->contains_atomic()) {
    if (type->qualifier.flags.q.explicit_binding &&
        type->qualifier.flags.q.explicit_offset) {
       unsigned qual_binding;
       unsigned qual_offset;
       if (process_qualifier_constant(state, &loc, "binding",
                                      type->qualifier.binding,
                                      &qual_binding)
           && process_qualifier_constant(state, &loc, "offset",
                                      type->qualifier.offset,
                                      &qual_offset)) {
          if (qual_binding < ARRAY_SIZE(state->atomic_counter_offsets)(sizeof(state->atomic_counter_offsets) / sizeof((state->
atomic_counter_offsets)[0])))
             state->atomic_counter_offsets[qual_binding] = qual_offset;
       }
    }

    ast_type_qualifier allowed_atomic_qual_mask;
    allowed_atomic_qual_mask.flags.i = 0;
    allowed_atomic_qual_mask.flags.q.explicit_binding = 1;
    allowed_atomic_qual_mask.flags.q.explicit_offset = 1;
    allowed_atomic_qual_mask.flags.q.uniform = 1;

    type->qualifier.validate_flags(&loc, state, allowed_atomic_qual_mask,
                                   "invalid layout qualifier for",
                                   "atomic_uint");
 }

 if (this->declarations.is_empty()) {
    /* If there is no structure involved in the program text, there are two
     * possible scenarios:
     *
     * - The program text contained something like 'vec4;'.  This is an
     *   empty declaration.  It is valid but weird.  Emit a warning.
     *
     * - The program text contained something like 'S;' and 'S' is not the
     *   name of a known structure type.  This is both invalid and weird.
     *   Emit an error.
     *
     * - The program text contained something like 'mediump float;'
     *   when the programmer probably meant 'precision mediump
     *   float;' Emit a warning with a description of what they
     *   probably meant to do.
     *
     * Note that if decl_type is NULL and there is a structure involved,
     * there must have been some sort of error with the structure.  In this
     * case we assume that an error was already generated on this line of
     * code for the structure.  There is no need to generate an additional,
     * confusing error.
     */
    assert(this->type->specifier->structure == NULL || decl_type != NULL(static_cast <bool> (this->type->specifier->structure
 == __null || decl_type != __null || state->error) ? void (
0) : __assert_fail ("this->type->specifier->structure == NULL || decl_type != NULL || state->error"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
))
           || state->error)(static_cast <bool> (this->type->specifier->structure
 == __null || decl_type != __null || state->error) ? void (
0) : __assert_fail ("this->type->specifier->structure == NULL || decl_type != NULL || state->error"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

    if (decl_type == NULL__null) {
       _mesa_glsl_error(&loc, state,
                        "invalid type `%s' in empty declaration",
                        type_name);
    } else {
       if (decl_type->is_array()) {
          /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
           * spec:
           *
           *    "... any declaration that leaves the size undefined is
           *    disallowed as this would add complexity and there are no
           *    use-cases."
           */
          if (state->es_shader && decl_type->is_unsized_array()) {
             _mesa_glsl_error(&loc, state, "array size must be explicitly "
                              "or implicitly defined");
          }

          /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
           *
           *    "The combinations of types and qualifiers that cause
           *    compile-time or link-time errors are the same whether or not
           *    the declaration is empty."
           */
          validate_array_dimensions(decl_type, state, &loc);
       }

       if (decl_type->is_atomic_uint()) {
          /* Empty atomic counter declarations are allowed and useful
           * to set the default offset qualifier.
           */
          return NULL__null;
       } else if (this->type->qualifier.precision != ast_precision_none) {
          if (this->type->specifier->structure != NULL__null) {
             _mesa_glsl_error(&loc, state,
                              "precision qualifiers can't be applied "
                              "to structures");
          } else {
             static const char *const precision_names[] = {
                "highp",
                "highp",
                "mediump",
                "lowp"
             };

             _mesa_glsl_warning(&loc, state,
                                "empty declaration with precision "
                                "qualifier, to set the default precision, "
                                "use `precision %s %s;'",
                                precision_names[this->type->
                                   qualifier.precision],
                                type_name);
          }
       } else if (this->type->specifier->structure == NULL__null) {
          _mesa_glsl_warning(&loc, state, "empty declaration");
       }
    }
 }

 foreach_list_typed (ast_declaration, decl, link, &this->declarations)for (ast_declaration * decl = (!exec_node_is_tail_sentinel((&
this->declarations)->head_sentinel.next) ? ((ast_declaration
 *) (((uintptr_t) (&this->declarations)->head_sentinel
.next) - (((char *) &((ast_declaration *) (&this->
declarations)->head_sentinel.next)->link) - ((char *) (
&this->declarations)->head_sentinel.next)))) : __null
); (decl) != __null; (decl) = (!exec_node_is_tail_sentinel((decl
)->link.next) ? ((ast_declaration *) (((uintptr_t) (decl)->
link.next) - (((char *) &((ast_declaration *) (decl)->
link.next)->link) - ((char *) (decl)->link.next)))) : __null
)) {
    const struct glsl_type *var_type;
    ir_variable *var;
    const char *identifier = decl->identifier;
    /* FINISHME: Emit a warning if a variable declaration shadows a
     * FINISHME: declaration at a higher scope.
     */

    if ((decl_type == NULL__null) || decl_type->is_void()) {
       if (type_name != NULL__null) {
          _mesa_glsl_error(& loc, state,
                           "invalid type `%s' in declaration of `%s'",
                           type_name, decl->identifier);
       } else {
          _mesa_glsl_error(& loc, state,
                           "invalid type in declaration of `%s'",
                           decl->identifier);
       }
       continue;
    }

    if (this->type->qualifier.is_subroutine_decl()) {
       const glsl_type *t;
       const char *name;

       t = state->symbols->get_type(this->type->specifier->type_name);
       if (!t)
          _mesa_glsl_error(& loc, state,
                           "invalid type in declaration of `%s'",
                           decl->identifier);
       name = ralloc_asprintf(ctx, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state->stage), decl->identifier);

       identifier = name;

    }
    var_type = process_array_type(&loc, decl_type, decl->array_specifier,
                                  state);

    var = new(ctx) ir_variable(var_type, identifier, ir_var_auto);

    /* The 'varying in' and 'varying out' qualifiers can only be used with
     * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
     * yet.
     */
    if (this->type->qualifier.flags.q.varying) {
       if (this->type->qualifier.flags.q.in) {
          _mesa_glsl_error(& loc, state,
                           "`varying in' qualifier in declaration of "
                           "`%s' only valid for geometry shaders using "
                           "ARB_geometry_shader4 or EXT_geometry_shader4",
                           decl->identifier);
       } else if (this->type->qualifier.flags.q.out) {
          _mesa_glsl_error(& loc, state,
                           "`varying out' qualifier in declaration of "
                           "`%s' only valid for geometry shaders using "
                           "ARB_geometry_shader4 or EXT_geometry_shader4",
                           decl->identifier);
       }
    }

    /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
     *
     *     "Global variables can only use the qualifiers const,
     *     attribute, uniform, or varying. Only one may be
     *     specified.
     *
     *     Local variables can only use the qualifier const."
     *
     * This is relaxed in GLSL 1.30 and GLSL ES 3.00.  It is also relaxed by
     * any extension that adds the 'layout' keyword.
     */
    if (!state->is_version(130, 300)
        && !state->has_explicit_attrib_location()
        && !state->has_separate_shader_objects()
        && !state->ARB_fragment_coord_conventions_enable) {
       /* GL_EXT_gpu_shader4 only allows "varying out" on fragment shader
        * outputs. (the varying flag is not set by the parser)
        */
       if (this->type->qualifier.flags.q.out &&
           (!state->EXT_gpu_shader4_enable ||
            state->stage != MESA_SHADER_FRAGMENT)) {
          _mesa_glsl_error(& loc, state,
                           "`out' qualifier in declaration of `%s' "
                           "only valid for function parameters in %s",
                           decl->identifier, state->get_version_string());
       }
       if (this->type->qualifier.flags.q.in) {
          _mesa_glsl_error(& loc, state,
                           "`in' qualifier in declaration of `%s' "
                           "only valid for function parameters in %s",
                           decl->identifier, state->get_version_string());
       }
       /* FINISHME: Test for other invalid qualifiers. */
    }

    apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
                                     & loc, false);
    apply_layout_qualifier_to_variable(&this->type->qualifier, var, state,
                                       &loc);

    if ((var->data.mode == ir_var_auto || var->data.mode == ir_var_temporary
         || var->data.mode == ir_var_shader_out)
        && (var->type->is_numeric() || var->type->is_boolean())
        && state->zero_init) {
       const ir_constant_data data = { { 0 } };
       var->data.has_initializer = true;
       var->constant_initializer = new(var) ir_constant(var->type, &data);
    }

    if (this->type->qualifier.flags.q.invariant) {
       if (!is_allowed_invariant(var, state)) {
          _mesa_glsl_error(&loc, state,
                           "`%s' cannot be marked invariant; interfaces between "
                           "shader stages only", var->name);
       }
    }

    if (state->current_function != NULL__null) {
       const char *mode = NULL__null;
       const char *extra = "";

       /* There is no need to check for 'inout' here because the parser will
        * only allow that in function parameter lists.
        */
       if (this->type->qualifier.flags.q.attribute) {
          mode = "attribute";
       } else if (this->type->qualifier.is_subroutine_decl()) {
          mode = "subroutine uniform";
       } else if (this->type->qualifier.flags.q.uniform) {
          mode = "uniform";
       } else if (this->type->qualifier.flags.q.varying) {
          mode = "varying";
       } else if (this->type->qualifier.flags.q.in) {
          mode = "in";
          extra = " or in function parameter list";
       } else if (this->type->qualifier.flags.q.out) {
          mode = "out";
          extra = " or in function parameter list";
       }

       if (mode) {
          _mesa_glsl_error(& loc, state,
                           "%s variable `%s' must be declared at "
                           "global scope%s",
                           mode, var->name, extra);
       }
    } else if (var->data.mode == ir_var_shader_in) {
       var->data.read_only = true;

       if (state->stage == MESA_SHADER_VERTEX) {
          bool error_emitted = false;

          /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
           *
           *    "Vertex shader inputs can only be float, floating-point
           *    vectors, matrices, signed and unsigned integers and integer
           *    vectors. Vertex shader inputs can also form arrays of these
           *    types, but not structures."
           *
           * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
           *
           *    "Vertex shader inputs can only be float, floating-point
           *    vectors, matrices, signed and unsigned integers and integer
           *    vectors. They cannot be arrays or structures."
           *
           * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
           *
           *    "The attribute qualifier can be used only with float,
           *    floating-point vectors, and matrices. Attribute variables
           *    cannot be declared as arrays or structures."
           *
           * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
           *
           *    "Vertex shader inputs can only be float, floating-point
           *    vectors, matrices, signed and unsigned integers and integer
           *    vectors. Vertex shader inputs cannot be arrays or
           *    structures."
           *
           * From section 4.3.4 of the ARB_bindless_texture spec:
           *
           *    "(modify third paragraph of the section to allow sampler and
           *    image types) ...  Vertex shader inputs can only be float,
           *    single-precision floating-point scalars, single-precision
           *    floating-point vectors, matrices, signed and unsigned
           *    integers and integer vectors, sampler and image types."
           */
          const glsl_type *check_type = var->type->without_array();

          switch (check_type->base_type) {
          case GLSL_TYPE_FLOAT:
          break;
          case GLSL_TYPE_UINT64:
          case GLSL_TYPE_INT64:
             break;
          case GLSL_TYPE_UINT:
          case GLSL_TYPE_INT:
             if (state->is_version(120, 300) || state->EXT_gpu_shader4_enable)
                break;
          case GLSL_TYPE_DOUBLE:
             if (check_type->is_double() && (state->is_version(410, 0) || state->ARB_vertex_attrib_64bit_enable))
                break;
          case GLSL_TYPE_SAMPLER:
             if (check_type->is_sampler() && state->has_bindless())
                break;
          case GLSL_TYPE_IMAGE:
             if (check_type->is_image() && state->has_bindless())
                break;
          /* FALLTHROUGH */
          default:
             _mesa_glsl_error(& loc, state,
                              "vertex shader input / attribute cannot have "
                              "type %s`%s'",
                              var->type->is_array() ? "array of " : "",
                              check_type->name);
             error_emitted = true;
          }

          if (!error_emitted && var->type->is_array() &&
              !state->check_version(150, 0, &loc,
                                    "vertex shader input / attribute "
                                    "cannot have array type")) {
             error_emitted = true;
          }
       } else if (state->stage == MESA_SHADER_GEOMETRY) {
          /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
           *
           *     Geometry shader input variables get the per-vertex values
           *     written out by vertex shader output variables of the same
           *     names. Since a geometry shader operates on a set of
           *     vertices, each input varying variable (or input block, see
           *     interface blocks below) needs to be declared as an array.
           */
          if (!var->type->is_array()) {
             _mesa_glsl_error(&loc, state,
                              "geometry shader inputs must be arrays");
          }

          handle_geometry_shader_input_decl(state, loc, var);
       } else if (state->stage == MESA_SHADER_FRAGMENT) {
          /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
           *
           *     It is a compile-time error to declare a fragment shader
           *     input with, or that contains, any of the following types:
           *
           *     * A boolean type
           *     * An opaque type
           *     * An array of arrays
           *     * An array of structures
           *     * A structure containing an array
           *     * A structure containing a structure
           */
          if (state->es_shader) {
             const glsl_type *check_type = var->type->without_array();
             if (check_type->is_boolean() ||
                 check_type->contains_opaque()) {
                _mesa_glsl_error(&loc, state,
                                 "fragment shader input cannot have type %s",
                                 check_type->name);
             }
             if (var->type->is_array() &&
                 var->type->fields.array->is_array()) {
                _mesa_glsl_error(&loc, state,
                                 "%s shader output "
                                 "cannot have an array of arrays",
                                 _mesa_shader_stage_to_string(state->stage));
             }
             if (var->type->is_array() &&
                 var->type->fields.array->is_struct()) {
                _mesa_glsl_error(&loc, state,
                                 "fragment shader input "
                                 "cannot have an array of structs");
             }
             if (var->type->is_struct()) {
                for (unsigned i = 0; i < var->type->length; i++) {
                   if (var->type->fields.structure[i].type->is_array() ||
                       var->type->fields.structure[i].type->is_struct())
                      _mesa_glsl_error(&loc, state,
                                       "fragment shader input cannot have "
                                       "a struct that contains an "
                                       "array or struct");
                }
             }
          }
       } else if (state->stage == MESA_SHADER_TESS_CTRL ||
                  state->stage == MESA_SHADER_TESS_EVAL) {
          handle_tess_shader_input_decl(state, loc, var);
       }
    } else if (var->data.mode == ir_var_shader_out) {
       const glsl_type *check_type = var->type->without_array();

       /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
        *
        *     It is a compile-time error to declare a fragment shader output
        *     that contains any of the following:
        *
        *     * A Boolean type (bool, bvec2 ...)
        *     * A double-precision scalar or vector (double, dvec2 ...)
        *     * An opaque type
        *     * Any matrix type
        *     * A structure
        */
       if (state->stage == MESA_SHADER_FRAGMENT) {
          if (check_type->is_struct() || check_type->is_matrix())
             _mesa_glsl_error(&loc, state,
                              "fragment shader output "
                              "cannot have struct or matrix type");
          switch (check_type->base_type) {
          case GLSL_TYPE_UINT:
          case GLSL_TYPE_INT:
          case GLSL_TYPE_FLOAT:
             break;
          default:
             _mesa_glsl_error(&loc, state,
                              "fragment shader output cannot have "
                              "type %s", check_type->name);
          }
       }

       /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
        *
        *     It is a compile-time error to declare a vertex shader output
        *     with, or that contains, any of the following types:
        *
        *     * A boolean type
        *     * An opaque type
        *     * An array of arrays
        *     * An array of structures
        *     * A structure containing an array
        *     * A structure containing a structure
        *
        *     It is a compile-time error to declare a fragment shader output
        *     with, or that contains, any of the following types:
        *
        *     * A boolean type
        *     * An opaque type
        *     * A matrix
        *     * A structure
        *     * An array of array
        *
        * ES 3.20 updates this to apply to tessellation and geometry shaders
        * as well.  Because there are per-vertex arrays in the new stages,
        * it strikes the "array of..." rules and replaces them with these:
        *
        *     * For per-vertex-arrayed variables (applies to tessellation
        *       control, tessellation evaluation and geometry shaders):
        *
        *       * Per-vertex-arrayed arrays of arrays
        *       * Per-vertex-arrayed arrays of structures
        *
        *     * For non-per-vertex-arrayed variables:
        *
        *       * An array of arrays
        *       * An array of structures
        *
        * which basically says to unwrap the per-vertex aspect and apply
        * the old rules.
        */
       if (state->es_shader) {
          if (var->type->is_array() &&
              var->type->fields.array->is_array()) {
             _mesa_glsl_error(&loc, state,
                              "%s shader output "
                              "cannot have an array of arrays",
                              _mesa_shader_stage_to_string(state->stage));
          }
          if (state->stage <= MESA_SHADER_GEOMETRY) {
             const glsl_type *type = var->type;

             if (state->stage == MESA_SHADER_TESS_CTRL &&
                 !var->data.patch && var->type->is_array()) {
                type = var->type->fields.array;
             }

             if (type->is_array() && type->fields.array->is_struct()) {
                _mesa_glsl_error(&loc, state,
                                 "%s shader output cannot have "
                                 "an array of structs",
                                 _mesa_shader_stage_to_string(state->stage));
             }
             if (type->is_struct()) {
                for (unsigned i = 0; i < type->length; i++) {
                   if (type->fields.structure[i].type->is_array() ||
                       type->fields.structure[i].type->is_struct())
                      _mesa_glsl_error(&loc, state,
                                       "%s shader output cannot have a "
                                       "struct that contains an "
                                       "array or struct",
                                       _mesa_shader_stage_to_string(state->stage));
                }
             }
          }
       }

       if (state->stage == MESA_SHADER_TESS_CTRL) {
          handle_tess_ctrl_shader_output_decl(state, loc, var);
       }
    } else if (var->type->contains_subroutine()) {
       /* declare subroutine uniforms as hidden */
       var->data.how_declared = ir_var_hidden;
    }

    /* From section 4.3.4 of the GLSL 4.00 spec:
     *    "Input variables may not be declared using the patch in qualifier
     *    in tessellation control or geometry shaders."
     *
     * From section 4.3.6 of the GLSL 4.00 spec:
     *    "It is an error to use patch out in a vertex, tessellation
     *    evaluation, or geometry shader."
     *
     * This doesn't explicitly forbid using them in a fragment shader, but
     * that's probably just an oversight.
     */
    if (state->stage != MESA_SHADER_TESS_EVAL
        && this->type->qualifier.flags.q.patch
        && this->type->qualifier.flags.q.in) {

       _mesa_glsl_error(&loc, state, "'patch in' can only be used in a "
                        "tessellation evaluation shader");
    }

    if (state->stage != MESA_SHADER_TESS_CTRL
        && this->type->qualifier.flags.q.patch
        && this->type->qualifier.flags.q.out) {

       _mesa_glsl_error(&loc, state, "'patch out' can only be used in a "
                        "tessellation control shader");
    }

    /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
     */
    if (this->type->qualifier.precision != ast_precision_none) {
       state->check_precision_qualifiers_allowed(&loc);
    }

    if (this->type->qualifier.precision != ast_precision_none &&
        !precision_qualifier_allowed(var->type)) {
       _mesa_glsl_error(&loc, state,
                        "precision qualifiers apply only to floating point"
                        ", integer and opaque types");
    }

    /* From section 4.1.7 of the GLSL 4.40 spec:
     *
     *    "[Opaque types] can only be declared as function
     *     parameters or uniform-qualified variables."
     *
     * From section 4.1.7 of the ARB_bindless_texture spec:
     *
     *    "Samplers may be declared as shader inputs and outputs, as uniform
     *     variables, as temporary variables, and as function parameters."
     *
     * From section 4.1.X of the ARB_bindless_texture spec:
     *
     *    "Images may be declared as shader inputs and outputs, as uniform
     *     variables, as temporary variables, and as function parameters."
     */
    if (!this->type->qualifier.flags.q.uniform &&
        (var_type->contains_atomic() ||
         (!state->has_bindless() && var_type->contains_opaque()))) {
       _mesa_glsl_error(&loc, state,
                        "%s variables must be declared uniform",
                        state->has_bindless() ? "atomic" : "opaque");
    }

    /* Process the initializer and add its instructions to a temporary
     * list.  This list will be added to the instruction stream (below) after
     * the declaration is added.  This is done because in some cases (such as
     * redeclarations) the declaration may not actually be added to the
     * instruction stream.
     */
    exec_list initializer_instructions;

    /* Examine var name here since var may get deleted in the next call */
    bool var_is_gl_id = is_gl_identifier(var->name);

    bool is_redeclaration;
    var = get_variable_being_redeclared(&var, decl->get_location(), state,
                                        false /* allow_all_redeclarations */,
                                        &is_redeclaration);
    if (is_redeclaration) {
       if (var_is_gl_id &&
           var->data.how_declared == ir_var_declared_in_block) {
          _mesa_glsl_error(&loc, state,
                           "`%s' has already been redeclared using "
                           "gl_PerVertex", var->name);
       }
       var->data.how_declared = ir_var_declared_normally;
    }

    if (decl->initializer != NULL__null) {
       result = process_initializer(var,
                                    decl, this->type,
                                    &initializer_instructions, state);
    } else {
       validate_array_dimensions(var_type, state, &loc);
    }

    /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
     *
     *     "It is an error to write to a const variable outside of
     *      its declaration, so they must be initialized when
     *      declared."
     */
    if (this->type->qualifier.flags.q.constant && decl->initializer == NULL__null) {
       _mesa_glsl_error(& loc, state,
                        "const declaration of `%s' must be initialized",
                        decl->identifier);
    }

    if (state->es_shader) {
       const glsl_type *const t = var->type;

       /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
        *
        * The GL_OES_tessellation_shader spec says about inputs:
        *
        *    "Declaring an array size is optional. If no size is specified,
        *     it will be taken from the implementation-dependent maximum
        *     patch size (gl_MaxPatchVertices)."
        *
        * and about TCS outputs:
        *
        *    "If no size is specified, it will be taken from output patch
        *     size declared in the shader."
        *
        * The GL_OES_geometry_shader spec says:
        *
        *    "All geometry shader input unsized array declarations will be
        *     sized by an earlier input primitive layout qualifier, when
        *     present, as per the following table."
        */
       const bool implicitly_sized =
          (var->data.mode == ir_var_shader_in &&
           state->stage >= MESA_SHADER_TESS_CTRL &&
           state->stage <= MESA_SHADER_GEOMETRY) ||
          (var->data.mode == ir_var_shader_out &&
           state->stage == MESA_SHADER_TESS_CTRL);

       if (t->is_unsized_array() && !implicitly_sized)
          /* Section 10.17 of the GLSL ES 1.00 specification states that
           * unsized array declarations have been removed from the language.
           * Arrays that are sized using an initializer are still explicitly
           * sized.  However, GLSL ES 1.00 does not allow array
           * initializers.  That is only allowed in GLSL ES 3.00.
           *
           * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
           *
           *     "An array type can also be formed without specifying a size
           *     if the definition includes an initializer:
           *
           *         float x[] = float[2] (1.0, 2.0);     // declares an array of size 2
           *         float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
           *
           *         float a[5];
           *         float b[] = a;"
           */
          _mesa_glsl_error(& loc, state,
                           "unsized array declarations are not allowed in "
                           "GLSL ES");
    }

    /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
     *
     *    "It is a compile-time error to declare an unsized array of
     *     atomic_uint"
     */
    if (var->type->is_unsized_array() &&
        var->type->without_array()->base_type == GLSL_TYPE_ATOMIC_UINT) {
       _mesa_glsl_error(& loc, state,
                        "Unsized array of atomic_uint is not allowed");
    }

    /* If the declaration is not a redeclaration, there are a few additional
     * semantic checks that must be applied.  In addition, variable that was
     * created for the declaration should be added to the IR stream.
     */
    if (!is_redeclaration) {
       validate_identifier(decl->identifier, loc, state);

       /* Add the variable to the symbol table.  Note that the initializer's
        * IR was already processed earlier (though it hasn't been emitted
        * yet), without the variable in scope.
        *
        * This differs from most C-like languages, but it follows the GLSL
        * specification.  From page 28 (page 34 of the PDF) of the GLSL 1.50
        * spec:
        *
        *     "Within a declaration, the scope of a name starts immediately
        *     after the initializer if present or immediately after the name
        *     being declared if not."
        */
       if (!state->symbols->add_variable(var)) {
          YYLTYPE loc = this->get_location();
          _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
                           "current scope", decl->identifier);
          continue;
       }

       /* Push the variable declaration to the top.  It means that all the
        * variable declarations will appear in a funny last-to-first order,
        * but otherwise we run into trouble if a function is prototyped, a
        * global var is decled, then the function is defined with usage of
        * the global var.  See glslparsertest's CorrectModule.frag.
        * However, do not insert declarations before default precision statements
        * or type declarations.
        */
       ir_instruction* before_node = (ir_instruction*)instructions->get_head();
       while (before_node && (before_node->ir_type == ir_type_precision || before_node->ir_type == ir_type_typedecl))
          before_node = (ir_instruction*)before_node->next;
       if (before_node)
          before_node->insert_before(var);
       else
          instructions->push_head(var);
    }

    instructions->append_list(&initializer_instructions);
 }


 /* Generally, variable declarations do not have r-values.  However,
  * one is used for the declaration in
  *
  * while (bool b = some_condition()) {
  *   ...
  * }
  *
  * so we return the rvalue from the last seen declaration here.
  */
 return result;
5810}


5813ir_rvalue *
5814ast_parameter_declarator::hir(exec_list *instructions,
                            struct _mesa_glsl_parse_state *state)
5816{
 void *ctx = state;
 const struct glsl_type *type;
 const char *name = NULL__null;
 YYLTYPE loc = this->get_location();

 type = this->type->glsl_type(& name, state);

 if (type == NULL__null) {
    if (name != NULL__null) {
       _mesa_glsl_error(& loc, state,
                        "invalid type `%s' in declaration of `%s'",
                        name, this->identifier);
    } else {
       _mesa_glsl_error(& loc, state,
                        "invalid type in declaration of `%s'",
                        this->identifier);
    }

    type = glsl_type::error_type;
 }

 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
  *
  *    "Functions that accept no input arguments need not use void in the
  *    argument list because prototypes (or definitions) are required and
  *    therefore there is no ambiguity when an empty argument list "( )" is
  *    declared. The idiom "(void)" as a parameter list is provided for
  *    convenience."
  *
  * Placing this check here prevents a void parameter being set up
  * for a function, which avoids tripping up checks for main taking
  * parameters and lookups of an unnamed symbol.
  */
 if (type->is_void()) {
    if (this->identifier != NULL__null)
       _mesa_glsl_error(& loc, state,
                        "named parameter cannot have type `void'");

    is_void = true;
    return NULL__null;
 }

 if (formal_parameter && (this->identifier == NULL__null)) {
    _mesa_glsl_error(& loc, state, "formal parameter lacks a name");
    return NULL__null;
 }

 /* This only handles "vec4 foo[..]".  The earlier specifier->glsl_type(...)
  * call already handled the "vec4[..] foo" case.
  */
 type = process_array_type(&loc, type, this->array_specifier, state);

 if (!type->is_error() && type->is_unsized_array()) {
    _mesa_glsl_error(&loc, state, "arrays passed as parameters must have "
                     "a declared size");
    type = glsl_type::error_type;
 }

 is_void = false;
 ir_variable *var = new(ctx)
    ir_variable(type, this->identifier, ir_var_function_in);

 /* Apply any specified qualifiers to the parameter declaration.  Note that
  * for function parameters the default mode is 'in'.
  */
 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc,
                                  true);

 /* From section 4.1.7 of the GLSL 4.40 spec:
  *
  *   "Opaque variables cannot be treated as l-values; hence cannot
  *    be used as out or inout function parameters, nor can they be
  *    assigned into."
  *
  * From section 4.1.7 of the ARB_bindless_texture spec:
  *
  *   "Samplers can be used as l-values, so can be assigned into and used
  *    as "out" and "inout" function parameters."
  *
  * From section 4.1.X of the ARB_bindless_texture spec:
  *
  *   "Images can be used as l-values, so can be assigned into and used as
  *    "out" and "inout" function parameters."
  */
 if ((var->data.mode == ir_var_function_inout || var->data.mode == ir_var_function_out)
     && (type->contains_atomic() ||
         (!state->has_bindless() && type->contains_opaque()))) {
    _mesa_glsl_error(&loc, state, "out and inout parameters cannot "
                     "contain %s variables",
                     state->has_bindless() ? "atomic" : "opaque");
    type = glsl_type::error_type;
 }

 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
  *
  *    "When calling a function, expressions that do not evaluate to
  *     l-values cannot be passed to parameters declared as out or inout."
  *
  * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
  *
  *    "Other binary or unary expressions, non-dereferenced arrays,
  *     function names, swizzles with repeated fields, and constants
  *     cannot be l-values."
  *
  * So for GLSL 1.10, passing an array as an out or inout parameter is not
  * allowed.  This restriction is removed in GLSL 1.20, and in GLSL ES.
  */
 if ((var->data.mode == ir_var_function_inout || var->data.mode == ir_var_function_out)
     && type->is_array()
     && !state->check_version(120, 100, &loc,
                              "arrays cannot be out or inout parameters")) {
    type = glsl_type::error_type;
 }

 instructions->push_tail(var);

 /* Parameter declarations do not have r-values.
  */
 return NULL__null;
5936}


5939void
5940ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters,
                                          bool formal,
                                          exec_list *ir_parameters,
                                          _mesa_glsl_parse_state *state)
5944{
 ast_parameter_declarator *void_param = NULL__null;
 unsigned count = 0;

 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters)for (ast_parameter_declarator * param = (!exec_node_is_tail_sentinel
((ast_parameters)->head_sentinel.next) ? ((ast_parameter_declarator
 *) (((uintptr_t) (ast_parameters)->head_sentinel.next) - (
((char *) &((ast_parameter_declarator *) (ast_parameters)
->head_sentinel.next)->link) - ((char *) (ast_parameters
)->head_sentinel.next)))) : __null); (param) != __null; (param
) = (!exec_node_is_tail_sentinel((param)->link.next) ? ((ast_parameter_declarator
 *) (((uintptr_t) (param)->link.next) - (((char *) &((
ast_parameter_declarator *) (param)->link.next)->link) -
 ((char *) (param)->link.next)))) : __null)) {
    param->formal_parameter = formal;
    param->hir(ir_parameters, state);

    if (param->is_void)
       void_param = param;

    count++;
 }

 if ((void_param != NULL__null) && (count > 1)) {
    YYLTYPE loc = void_param->get_location();

    _mesa_glsl_error(& loc, state,
                     "`void' parameter must be only parameter");
 }
5964}


5967void
5968emit_function(_mesa_glsl_parse_state *state, ir_function *f)
5969{
 /* IR invariants disallow function declarations or definitions
  * nested within other function definitions.  But there is no
  * requirement about the relative order of function declarations
  * and definitions with respect to one another.  So simply insert
  * the new ir_function block at the end of the toplevel instruction
  * list.
  */
 state->toplevel_ir->push_tail(f);
5978}


5981ir_rvalue *
5982ast_function::hir(exec_list *instructions,
                struct _mesa_glsl_parse_state *state)
5984{
 void *ctx = state;
 ir_function *f = NULL__null;
 ir_function_signature *sig = NULL__null;
 exec_list hir_parameters;
 YYLTYPE loc = this->get_location();

 const char *const name = identifier;

 /* New functions are always added to the top-level IR instruction stream,
  * so this instruction list pointer is ignored.  See also emit_function
  * (called below).
  */
 (void) instructions;

 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
  *
  *   "Function declarations (prototypes) cannot occur inside of functions;
  *   they must be at global scope, or for the built-in functions, outside
  *   the global scope."
  *
  * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
  *
  *   "User defined functions may only be defined within the global scope."
  *
  * Note that this language does not appear in GLSL 1.10.
  */
 if ((state->current_function != NULL__null) &&
     state->is_version(120, 100)) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(&loc, state,
                     "declaration of function `%s' not allowed within "
                     "function body", name);
 }

 validate_identifier(name, this->get_location(), state);

 /* Convert the list of function parameters to HIR now so that they can be
  * used below to compare this function's signature with previously seen
  * signatures for functions with the same name.
  */
 ast_parameter_declarator::parameters_to_hir(& this->parameters,
                                             is_definition,
                                             & hir_parameters, state);

 const char *return_type_name;
 const glsl_type *return_type =
    this->return_type->glsl_type(& return_type_name, state);

 if (!return_type) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(&loc, state,
                     "function `%s' has undeclared return type `%s'",
                     name, return_type_name);
    return_type = glsl_type::error_type;
 }

 /* ARB_shader_subroutine states:
  *  "Subroutine declarations cannot be prototyped. It is an error to prepend
  *   subroutine(...) to a function declaration."
  */
 if (this->return_type->qualifier.subroutine_list && !is_definition) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(&loc, state,
                     "function declaration `%s' cannot have subroutine prepended",
                     name);
 }

 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
  * "No qualifier is allowed on the return type of a function."
  */
 if (this->return_type->has_qualifiers(state)) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(& loc, state,
                     "function `%s' return type has qualifiers", name);
 }

 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
  *
  *     "Arrays are allowed as arguments and as the return type. In both
  *     cases, the array must be explicitly sized."
  */
 if (return_type->is_unsized_array()) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(& loc, state,
                     "function `%s' return type array must be explicitly "
                     "sized", name);
 }

 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
  *
  *     "Arrays are allowed as arguments, but not as the return type. [...]
  *      The return type can also be a structure if the structure does not
  *      contain an array."
  */
 if (state->language_version == 100 && return_type->contains_array()) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(& loc, state,
                     "function `%s' return type contains an array", name);
 }

 /* From section 4.1.7 of the GLSL 4.40 spec:
  *
  *    "[Opaque types] can only be declared as function parameters
  *     or uniform-qualified variables."
  *
  * The ARB_bindless_texture spec doesn't clearly state this, but as it says
  * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
  * (Images)", this should be allowed.
  */
 if (return_type->contains_atomic() ||
     (!state->has_bindless() && return_type->contains_opaque())) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(&loc, state,
                     "function `%s' return type can't contain an %s type",
                     name, state->has_bindless() ? "atomic" : "opaque");
 }

 /**/
 if (return_type->is_subroutine()) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(&loc, state,
                     "function `%s' return type can't be a subroutine type",
                     name);
 }

 /* Get the precision for the return type */
 unsigned return_precision;

 if (state->es_shader) {
    YYLTYPE loc = this->get_location();
    return_precision =
       select_gles_precision(this->return_type->qualifier.precision,
                             return_type,
                             state,
                             &loc);
 } else {
    return_precision = GLSL_PRECISION_NONE;
 }

 /* Create an ir_function if one doesn't already exist. */
 f = state->symbols->get_function(name);
 if (f == NULL__null) {
    f = new(ctx) ir_function(name);
    if (!this->return_type->qualifier.is_subroutine_decl()) {
       if (!state->symbols->add_function(f)) {
          /* This function name shadows a non-function use of the same name. */
          YYLTYPE loc = this->get_location();
          _mesa_glsl_error(&loc, state, "function name `%s' conflicts with "
                           "non-function", name);
          return NULL__null;
       }
    }
    emit_function(state, f);
 }

 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
  *
  * "A shader cannot redefine or overload built-in functions."
  *
  * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
  *
  * "User code can overload the built-in functions but cannot redefine
  * them."
  */
 if (state->es_shader) {
    /* Local shader has no exact candidates; check the built-ins. */
    if (state->language_version >= 300 &&
        _mesa_glsl_has_builtin_function(state, name)) {
       YYLTYPE loc = this->get_location();
       _mesa_glsl_error(& loc, state,
                        "A shader cannot redefine or overload built-in "
                        "function `%s' in GLSL ES 3.00", name);
       return NULL__null;
    }

    if (state->language_version == 100) {
       ir_function_signature *sig =
          _mesa_glsl_find_builtin_function(state, name, &hir_parameters);
       if (sig && sig->is_builtin()) {
          _mesa_glsl_error(& loc, state,
                           "A shader cannot redefine built-in "
                           "function `%s' in GLSL ES 1.00", name);
       }
    }
 }

 /* Verify that this function's signature either doesn't match a previously
  * seen signature for a function with the same name, or, if a match is found,
  * that the previously seen signature does not have an associated definition.
  */
 if (state->es_shader || f->has_user_signature()) {
    sig = f->exact_matching_signature(state, &hir_parameters);
    if (sig != NULL__null) {
       const char *badvar = sig->qualifiers_match(&hir_parameters);
       if (badvar != NULL__null) {
          YYLTYPE loc = this->get_location();

          _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' "
                           "qualifiers don't match prototype", name, badvar);
       }

       if (sig->return_type != return_type) {
          YYLTYPE loc = this->get_location();

          _mesa_glsl_error(&loc, state, "function `%s' return type doesn't "
                           "match prototype", name);
       }

       if (sig->return_precision != return_precision) {
          YYLTYPE loc = this->get_location();

          _mesa_glsl_error(&loc, state, "function `%s' return type precision "
                           "doesn't match prototype", name);
       }

       if (sig->is_defined) {
          if (is_definition) {
             YYLTYPE loc = this->get_location();
             _mesa_glsl_error(& loc, state, "function `%s' redefined", name);
          } else {
             /* We just encountered a prototype that exactly matches a
              * function that's already been defined.  This is redundant,
              * and we should ignore it.
              */
             return NULL__null;
          }
       } else if (state->language_version == 100 && !is_definition) {
          /* From the GLSL 1.00 spec, section 4.2.7:
           *
           *     "A particular variable, structure or function declaration
           *      may occur at most once within a scope with the exception
           *      that a single function prototype plus the corresponding
           *      function definition are allowed."
           */
          YYLTYPE loc = this->get_location();
          _mesa_glsl_error(&loc, state, "function `%s' redeclared", name);
       }
    }
 }

 /* Verify the return type of main() */
 if (strcmp(name, "main") == 0) {
    if (! return_type->is_void()) {
       YYLTYPE loc = this->get_location();

       _mesa_glsl_error(& loc, state, "main() must return void");
    }

    if (!hir_parameters.is_empty()) {
       YYLTYPE loc = this->get_location();

       _mesa_glsl_error(& loc, state, "main() must not take any parameters");
    }
 }

 /* Finish storing the information about this new function in its signature.
  */
 if (sig == NULL__null) {
    sig = new(ctx) ir_function_signature(return_type);
    sig->return_precision = return_precision;
    f->add_signature(sig);
 }

 sig->replace_parameters(&hir_parameters);
 signature = sig;

 if (this->return_type->qualifier.subroutine_list) {
    int idx;

    if (this->return_type->qualifier.flags.q.explicit_index) {
       unsigned qual_index;
       if (process_qualifier_constant(state, &loc, "index",
                                      this->return_type->qualifier.index,
                                      &qual_index)) {
          if (!state->has_explicit_uniform_location()) {
             _mesa_glsl_error(&loc, state, "subroutine index requires "
                              "GL_ARB_explicit_uniform_location or "
                              "GLSL 4.30");
          } else if (qual_index >= MAX_SUBROUTINES256) {
             _mesa_glsl_error(&loc, state,
                              "invalid subroutine index (%d) index must "
                              "be a number between 0 and "
                              "GL_MAX_SUBROUTINES - 1 (%d)", qual_index,
                              MAX_SUBROUTINES256 - 1);
          } else {
             f->subroutine_index = qual_index;
          }
       }
    }

    f->num_subroutine_types = this->return_type->qualifier.subroutine_list->declarations.length();
    f->subroutine_types = ralloc_array(state, const struct glsl_type *,((const struct glsl_type * *) ralloc_array_size(state, sizeof
(const struct glsl_type *), f->num_subroutine_types))
                                       f->num_subroutine_types)((const struct glsl_type * *) ralloc_array_size(state, sizeof
(const struct glsl_type *), f->num_subroutine_types));
    idx = 0;
    foreach_list_typed(ast_declaration, decl, link, &this->return_type->qualifier.subroutine_list->declarations)for (ast_declaration * decl = (!exec_node_is_tail_sentinel((&
this->return_type->qualifier.subroutine_list->declarations
)->head_sentinel.next) ? ((ast_declaration *) (((uintptr_t
) (&this->return_type->qualifier.subroutine_list->
declarations)->head_sentinel.next) - (((char *) &((ast_declaration
 *) (&this->return_type->qualifier.subroutine_list->
declarations)->head_sentinel.next)->link) - ((char *) (
&this->return_type->qualifier.subroutine_list->declarations
)->head_sentinel.next)))) : __null); (decl) != __null; (decl
) = (!exec_node_is_tail_sentinel((decl)->link.next) ? ((ast_declaration
 *) (((uintptr_t) (decl)->link.next) - (((char *) &((ast_declaration
 *) (decl)->link.next)->link) - ((char *) (decl)->link
.next)))) : __null)) {
       const struct glsl_type *type;
       /* the subroutine type must be already declared */
       type = state->symbols->get_type(decl->identifier);
       if (!type) {
          _mesa_glsl_error(& loc, state, "unknown type '%s' in subroutine function definition", decl->identifier);
       }

       for (int i = 0; i < state->num_subroutine_types; i++) {
          ir_function *fn = state->subroutine_types[i];
          ir_function_signature *tsig = NULL__null;

          if (strcmp(fn->name, decl->identifier))
             continue;

          tsig = fn->matching_signature(state, &sig->parameters,
                                        false);
          if (!tsig) {
             _mesa_glsl_error(& loc, state, "subroutine type mismatch '%s' - signatures do not match\n", decl->identifier);
          } else {
             if (tsig->return_type != sig->return_type) {
                _mesa_glsl_error(& loc, state, "subroutine type mismatch '%s' - return types do not match\n", decl->identifier);
             }
          }
       }
       f->subroutine_types[idx++] = type;
    }
    state->subroutines = (ir_function **)reralloc(state, state->subroutines,((ir_function * *) reralloc_array_size(state, state->subroutines
, sizeof(ir_function *), state->num_subroutines + 1))
                                                  ir_function *,((ir_function * *) reralloc_array_size(state, state->subroutines
, sizeof(ir_function *), state->num_subroutines + 1))
                                                  state->num_subroutines + 1)((ir_function * *) reralloc_array_size(state, state->subroutines
, sizeof(ir_function *), state->num_subroutines + 1));
    state->subroutines[state->num_subroutines] = f;
    state->num_subroutines++;

 }

 if (this->return_type->qualifier.is_subroutine_decl()) {
    if (!state->symbols->add_type(this->identifier, glsl_type::get_subroutine_instance(this->identifier))) {
       _mesa_glsl_error(& loc, state, "type '%s' previously defined", this->identifier);
       return NULL__null;
    }
    state->subroutine_types = (ir_function **)reralloc(state, state->subroutine_types,((ir_function * *) reralloc_array_size(state, state->subroutine_types
, sizeof(ir_function *), state->num_subroutine_types + 1))
                                                       ir_function *,((ir_function * *) reralloc_array_size(state, state->subroutine_types
, sizeof(ir_function *), state->num_subroutine_types + 1))
                                                       state->num_subroutine_types + 1)((ir_function * *) reralloc_array_size(state, state->subroutine_types
, sizeof(ir_function *), state->num_subroutine_types + 1));
    state->subroutine_types[state->num_subroutine_types] = f;
    state->num_subroutine_types++;

    f->is_subroutine = true;
 }

 /* Function declarations (prototypes) do not have r-values.
  */
 return NULL__null;
6331}


6334ir_rvalue *
6335ast_function_definition::hir(exec_list *instructions,
                           struct _mesa_glsl_parse_state *state)
6337{
 prototype->is_definition = true;
 prototype->hir(instructions, state);

 ir_function_signature *signature = prototype->signature;
 if (signature == NULL__null)
    return NULL__null;

 assert(state->current_function == NULL)(static_cast <bool> (state->current_function == __null
) ? void (0) : __assert_fail ("state->current_function == NULL"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
 state->current_function = signature;
 state->found_return = false;
 state->found_begin_interlock = false;
 state->found_end_interlock = false;

 /* Duplicate parameters declared in the prototype as concrete variables.
  * Add these to the symbol table.
  */
 state->symbols->push_scope();
 foreach_in_list(ir_variable, var, &signature->parameters)for (ir_variable *var = (!exec_node_is_tail_sentinel((&signature
->parameters)->head_sentinel.next) ? (ir_variable *) ((
&signature->parameters)->head_sentinel.next) : __null
); (var) != __null; (var) = (!exec_node_is_tail_sentinel((var
)->next) ? (ir_variable *) ((var)->next) : __null)) {
    assert(var->as_variable() != NULL)(static_cast <bool> (var->as_variable() != __null) ?
 void (0) : __assert_fail ("var->as_variable() != NULL", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

    /* The only way a parameter would "exist" is if two parameters have
     * the same name.
     */
    if (state->symbols->name_declared_this_scope(var->name)) {
       YYLTYPE loc = this->get_location();

       _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name);
    } else {
       state->symbols->add_variable(var);
    }
 }

 /* Convert the body of the function to HIR. */
 this->body->hir(&signature->body, state);
 signature->is_defined = true;

 state->symbols->pop_scope();

 assert(state->current_function == signature)(static_cast <bool> (state->current_function == signature
) ? void (0) : __assert_fail ("state->current_function == signature"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
 state->current_function = NULL__null;

 if (!signature->return_type->is_void() && !state->found_return) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(& loc, state, "function `%s' has non-void return type "
                     "%s, but no return statement",
                     signature->function_name(),
                     signature->return_type->name);
 }

 /* Function definitions do not have r-values.
  */
 return NULL__null;
6390}


6393ir_rvalue *
6394ast_jump_statement::hir(exec_list *instructions,
                      struct _mesa_glsl_parse_state *state)
6396{
 void *ctx = state;

 switch (mode) {
 case ast_return: {
    ir_return *inst;
    assert(state->current_function)(static_cast <bool> (state->current_function) ? void
 (0) : __assert_fail ("state->current_function", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

    if (opt_return_value) {
       ir_rvalue *ret = opt_return_value->hir(instructions, state);

       /* The value of the return type can be NULL if the shader says
        * 'return foo();' and foo() is a function that returns void.
        *
        * NOTE: The GLSL spec doesn't say that this is an error.  The type
        * of the return value is void.  If the return type of the function is
        * also void, then this should compile without error.  Seriously.
        */
       const glsl_type *const ret_type =
          (ret == NULL__null) ? glsl_type::void_type : ret->type;

       /* Implicit conversions are not allowed for return values prior to
        * ARB_shading_language_420pack.
        */
       if (state->current_function->return_type != ret_type) {
          YYLTYPE loc = this->get_location();

          if (state->has_420pack()) {
             if (!apply_implicit_conversion(state->current_function->return_type,
                                            ret, state)
                 || (ret->type != state->current_function->return_type)) {
                _mesa_glsl_error(& loc, state,
                                 "could not implicitly convert return value "
                                 "to %s, in function `%s'",
                                 state->current_function->return_type->name,
                                 state->current_function->function_name());
             }
          } else {
             _mesa_glsl_error(& loc, state,
                              "`return' with wrong type %s, in function `%s' "
                              "returning %s",
                              ret_type->name,
                              state->current_function->function_name(),
                              state->current_function->return_type->name);
          }
       } else if (state->current_function->return_type->base_type ==
                  GLSL_TYPE_VOID) {
          YYLTYPE loc = this->get_location();

          /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
           * specs add a clarification:
           *
           *    "A void function can only use return without a return argument, even if
           *     the return argument has void type. Return statements only accept values:
           *
           *         void func1() { }
           *         void func2() { return func1(); } // illegal return statement"
           */
          _mesa_glsl_error(& loc, state,
                           "void functions can only use `return' without a "
                           "return argument");
       }

       inst = new(ctx) ir_return(ret);
    } else {
       if (state->current_function->return_type->base_type !=
           GLSL_TYPE_VOID) {
          YYLTYPE loc = this->get_location();

          _mesa_glsl_error(& loc, state,
                           "`return' with no value, in function %s returning "
                           "non-void",
          state->current_function->function_name());
       }
       inst = new(ctx) ir_return;
    }

    state->found_return = true;
    instructions->push_tail(inst);
    break;
 }

 case ast_discard:
    if (state->stage != MESA_SHADER_FRAGMENT) {
       YYLTYPE loc = this->get_location();

       _mesa_glsl_error(& loc, state,
                        "`discard' may only appear in a fragment shader");
    }
    instructions->push_tail(new(ctx) ir_discard);
    break;

 case ast_break:
 case ast_continue:
    if (mode == ast_continue &&
        state->loop_nesting_ast == NULL__null) {
       YYLTYPE loc = this->get_location();

       _mesa_glsl_error(& loc, state, "continue may only appear in a loop");
    } else if (mode == ast_break &&
       state->loop_nesting_ast == NULL__null &&
       state->switch_state.switch_nesting_ast == NULL__null) {
       YYLTYPE loc = this->get_location();

       _mesa_glsl_error(& loc, state,
                        "break may only appear in a loop or a switch");
    } else {
       /* For a loop, inline the for loop expression again, since we don't
        * know where near the end of the loop body the normal copy of it is
        * going to be placed.  Same goes for the condition for a do-while
        * loop.
        */
       if (state->loop_nesting_ast != NULL__null &&
           mode == ast_continue) {
          if (state->loop_nesting_ast->rest_expression) {
             state->loop_nesting_ast->rest_expression->hir(instructions,
                                                           state);
          }
          if (state->loop_nesting_ast->mode ==
              ast_iteration_statement::ast_do_while) {
             state->loop_nesting_ast->condition_to_hir(instructions, state);
          }
       }

       if (state->switch_state.is_switch_innermost &&
           mode == ast_break) {
          /* Force break out of switch by setting is_break switch state.
           */
          ir_variable *const is_break_var = state->switch_state.is_break_var;
          ir_dereference_variable *const deref_is_break_var =
             new(ctx) ir_dereference_variable(is_break_var);
          ir_constant *const true_val = new(ctx) ir_constant(true);
          ir_assignment *const set_break_var =
             new(ctx) ir_assignment(deref_is_break_var, true_val);

          instructions->push_tail(set_break_var);
       } else {
          ir_loop_jump *const jump =
             new(ctx) ir_loop_jump((mode == ast_break)
                ? ir_loop_jump::jump_break
                : ir_loop_jump::jump_continue);
          instructions->push_tail(jump);
       }
    }

    break;
 }

 /* Jump instructions do not have r-values.
  */
 return NULL__null;
6547}


6550ir_rvalue *
6551ast_demote_statement::hir(exec_list *instructions,
                        struct _mesa_glsl_parse_state *state)
6553{
 void *ctx = state;

 if (state->stage != MESA_SHADER_FRAGMENT) {
    YYLTYPE loc = this->get_location();

    _mesa_glsl_error(& loc, state,
                     "`demote' may only appear in a fragment shader");
 }

 instructions->push_tail(new(ctx) ir_demote);

 return NULL__null;
6566}


6569ir_rvalue *
6570ast_selection_statement::hir(exec_list *instructions,
                           struct _mesa_glsl_parse_state *state)
6572{
 void *ctx = state;

 ir_rvalue *const condition = this->condition->hir(instructions, state);

 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
  *
  *    "Any expression whose type evaluates to a Boolean can be used as the
  *    conditional expression bool-expression. Vector types are not accepted
  *    as the expression to if."
  *
  * The checks are separated so that higher quality diagnostics can be
  * generated for cases where both rules are violated.
  */
 if (!condition->type->is_boolean() || !condition->type->is_scalar()) {
    YYLTYPE loc = this->condition->get_location();

    _mesa_glsl_error(& loc, state, "if-statement condition must be scalar "
                     "boolean");
 }

 ir_if *const stmt = new(ctx) ir_if(condition);

 if (then_statement != NULL__null) {
    state->symbols->push_scope();
    then_statement->hir(& stmt->then_instructions, state);
    state->symbols->pop_scope();
 }

 if (else_statement != NULL__null) {
    state->symbols->push_scope();
    else_statement->hir(& stmt->else_instructions, state);
    state->symbols->pop_scope();
 }

 instructions->push_tail(stmt);

 /* if-statements do not have r-values.
  */
 return NULL__null;
6612}


6615struct case_label {
 /** Value of the case label. */
 unsigned value;

 /** Does this label occur after the default? */
 bool after_default;

 /**
  * AST for the case label.
  *
  * This is only used to generate error messages for duplicate labels.
  */
 ast_expression *ast;
6628};

6630/* Used for detection of duplicate case values, compare
* given contents directly.
*/
6633static bool
6634compare_case_value(const void *a, const void *b)
6635{
 return ((struct case_label *) a)->value == ((struct case_label *) b)->value;
6637}


6640/* Used for detection of duplicate case values, just
* returns key contents as is.
*/
6643static unsigned
6644key_contents(const void *key)
6645{
 return ((struct case_label *) key)->value;
6647}


6650ir_rvalue *
6651ast_switch_statement::hir(exec_list *instructions,
                        struct _mesa_glsl_parse_state *state)
6653{
 void *ctx = state;

 ir_rvalue *const test_expression =
    this->test_expression->hir(instructions, state);

 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
  *
  *    "The type of init-expression in a switch statement must be a
  *     scalar integer."
  */
 if (!test_expression->type->is_scalar() ||
     !test_expression->type->is_integer_32()) {
    YYLTYPE loc = this->test_expression->get_location();

    _mesa_glsl_error(& loc,
                     state,
                     "switch-statement expression must be scalar "
                     "integer");
    return NULL__null;
 }

 /* Track the switch-statement nesting in a stack-like manner.
  */
 struct glsl_switch_state saved = state->switch_state;

 state->switch_state.is_switch_innermost = true;
 state->switch_state.switch_nesting_ast = this;
 state->switch_state.labels_ht =
       _mesa_hash_table_create(NULL__null, key_contents,
                               compare_case_value);
 state->switch_state.previous_default = NULL__null;

 /* Initalize is_fallthru state to false.
  */
 ir_rvalue *const is_fallthru_val = new (ctx) ir_constant(false);
 state->switch_state.is_fallthru_var =
    new(ctx) ir_variable(glsl_type::bool_type,
                         "switch_is_fallthru_tmp",
                         ir_var_temporary);
 instructions->push_tail(state->switch_state.is_fallthru_var);

 ir_dereference_variable *deref_is_fallthru_var =
    new(ctx) ir_dereference_variable(state->switch_state.is_fallthru_var);
 instructions->push_tail(new(ctx) ir_assignment(deref_is_fallthru_var,
                                                is_fallthru_val));

 /* Initialize is_break state to false.
  */
 ir_rvalue *const is_break_val = new (ctx) ir_constant(false);
 state->switch_state.is_break_var =
    new(ctx) ir_variable(glsl_type::bool_type,
                         "switch_is_break_tmp",
                         ir_var_temporary);
 instructions->push_tail(state->switch_state.is_break_var);

 ir_dereference_variable *deref_is_break_var =
    new(ctx) ir_dereference_variable(state->switch_state.is_break_var);
 instructions->push_tail(new(ctx) ir_assignment(deref_is_break_var,
                                                is_break_val));

 state->switch_state.run_default =
    new(ctx) ir_variable(glsl_type::bool_type,
                           "run_default_tmp",
                           ir_var_temporary);
 instructions->push_tail(state->switch_state.run_default);

 /* Cache test expression.
  */
 test_to_hir(instructions, state);

 /* Emit code for body of switch stmt.
  */
 body->hir(instructions, state);

 _mesa_hash_table_destroy(state->switch_state.labels_ht, NULL__null);

 state->switch_state = saved;

 /* Switch statements do not have r-values. */
 return NULL__null;
6734}


6737void
6738ast_switch_statement::test_to_hir(exec_list *instructions,
                                struct _mesa_glsl_parse_state *state)
6740{
 void *ctx = state;

 /* set to true to avoid a duplicate "use of uninitialized variable" warning
  * on the switch test case. The first one would be already raised when
  * getting the test_expression at ast_switch_statement::hir
  */
 test_expression->set_is_lhs(true);
 /* Cache value of test expression. */
 ir_rvalue *const test_val = test_expression->hir(instructions, state);

 state->switch_state.test_var = new(ctx) ir_variable(test_val->type,
                                                     "switch_test_tmp",
                                                     ir_var_temporary);
 ir_dereference_variable *deref_test_var =
    new(ctx) ir_dereference_variable(state->switch_state.test_var);

 instructions->push_tail(state->switch_state.test_var);
 instructions->push_tail(new(ctx) ir_assignment(deref_test_var, test_val));
6759}


6762ir_rvalue *
6763ast_switch_body::hir(exec_list *instructions,
                   struct _mesa_glsl_parse_state *state)
6765{
 if (stmts != NULL__null)
    stmts->hir(instructions, state);

 /* Switch bodies do not have r-values. */
 return NULL__null;
6771}

6773ir_rvalue *
6774ast_case_statement_list::hir(exec_list *instructions,
                           struct _mesa_glsl_parse_state *state)
6776{
 exec_list default_case, after_default, tmp;

 foreach_list_typed (ast_case_statement, case_stmt, link, & this->cases)for (ast_case_statement * case_stmt = (!exec_node_is_tail_sentinel
((& this->cases)->head_sentinel.next) ? ((ast_case_statement
 *) (((uintptr_t) (& this->cases)->head_sentinel.next
) - (((char *) &((ast_case_statement *) (& this->cases
)->head_sentinel.next)->link) - ((char *) (& this->
cases)->head_sentinel.next)))) : __null); (case_stmt) != __null
; (case_stmt) = (!exec_node_is_tail_sentinel((case_stmt)->
link.next) ? ((ast_case_statement *) (((uintptr_t) (case_stmt
)->link.next) - (((char *) &((ast_case_statement *) (case_stmt
)->link.next)->link) - ((char *) (case_stmt)->link.next
)))) : __null)) {
    case_stmt->hir(&tmp, state);

    /* Default case. */
    if (state->switch_state.previous_default && default_case.is_empty()) {
       default_case.append_list(&tmp);
       continue;
    }

    /* If default case found, append 'after_default' list. */
    if (!default_case.is_empty())
       after_default.append_list(&tmp);
    else
       instructions->append_list(&tmp);
 }

 /* Handle the default case. This is done here because default might not be
  * the last case. We need to add checks against following cases first to see
  * if default should be chosen or not.
  */
 if (!default_case.is_empty()) {
    ir_factory body(instructions, state);

    ir_expression *cmp = NULL__null;

    hash_table_foreach(state->switch_state.labels_ht, entry)for (struct hash_entry *entry = _mesa_hash_table_next_entry(state
->switch_state.labels_ht, __null); entry != __null; entry =
 _mesa_hash_table_next_entry(state->switch_state.labels_ht
, entry)) {
       const struct case_label *const l = (struct case_label *) entry->data;

       /* If the switch init-value is the value of one of the labels that
        * occurs after the default case, disable execution of the default
        * case.
        */
       if (l->after_default) {
          ir_constant *const cnst =
             state->switch_state.test_var->type->base_type == GLSL_TYPE_UINT
             ? body.constant(unsigned(l->value))
             : body.constant(int(l->value));

          cmp = cmp == NULL__null
             ? equal(cnst, state->switch_state.test_var)
             : logic_or(cmp, equal(cnst, state->switch_state.test_var));
       }
    }

    if (cmp != NULL__null)
       body.emit(assign(state->switch_state.run_default, logic_not(cmp)));
    else
       body.emit(assign(state->switch_state.run_default, body.constant(true)));

    /* Append default case and all cases after it. */
    instructions->append_list(&default_case);
    instructions->append_list(&after_default);
 }

 /* Case statements do not have r-values. */
 return NULL__null;
6835}

6837ir_rvalue *
6838ast_case_statement::hir(exec_list *instructions,
                      struct _mesa_glsl_parse_state *state)
6840{
 labels->hir(instructions, state);

 /* Conditionally set fallthru state based on break state. */
 ir_factory reset_fallthru(instructions, state);
 reset_fallthru.emit(assign(state->switch_state.is_fallthru_var,
                            logic_and(state->switch_state.is_fallthru_var,
                                      logic_not(state->switch_state.is_break_var))));

 /* Guard case statements depending on fallthru state. */
 ir_dereference_variable *const deref_fallthru_guard =
    new(state) ir_dereference_variable(state->switch_state.is_fallthru_var);
 ir_if *const test_fallthru = new(state) ir_if(deref_fallthru_guard);

 foreach_list_typed (ast_node, stmt, link, & this->stmts)for (ast_node * stmt = (!exec_node_is_tail_sentinel((& this
->stmts)->head_sentinel.next) ? ((ast_node *) (((uintptr_t
) (& this->stmts)->head_sentinel.next) - (((char *)
 &((ast_node *) (& this->stmts)->head_sentinel.
next)->link) - ((char *) (& this->stmts)->head_sentinel
.next)))) : __null); (stmt) != __null; (stmt) = (!exec_node_is_tail_sentinel
((stmt)->link.next) ? ((ast_node *) (((uintptr_t) (stmt)->
link.next) - (((char *) &((ast_node *) (stmt)->link.next
)->link) - ((char *) (stmt)->link.next)))) : __null))
    stmt->hir(& test_fallthru->then_instructions, state);

 instructions->push_tail(test_fallthru);

 /* Case statements do not have r-values. */
 return NULL__null;
6861}


6864ir_rvalue *
6865ast_case_label_list::hir(exec_list *instructions,
                       struct _mesa_glsl_parse_state *state)
6867{
 foreach_list_typed (ast_case_label, label, link, & this->labels)for (ast_case_label * label = (!exec_node_is_tail_sentinel((&
 this->labels)->head_sentinel.next) ? ((ast_case_label *
) (((uintptr_t) (& this->labels)->head_sentinel.next
) - (((char *) &((ast_case_label *) (& this->labels
)->head_sentinel.next)->link) - ((char *) (& this->
labels)->head_sentinel.next)))) : __null); (label) != __null
; (label) = (!exec_node_is_tail_sentinel((label)->link.next
) ? ((ast_case_label *) (((uintptr_t) (label)->link.next) -
 (((char *) &((ast_case_label *) (label)->link.next)->
link) - ((char *) (label)->link.next)))) : __null))
    label->hir(instructions, state);

 /* Case labels do not have r-values. */
 return NULL__null;
6873}

6875ir_rvalue *
6876ast_case_label::hir(exec_list *instructions,
                  struct _mesa_glsl_parse_state *state)
6878{
 ir_factory body(instructions, state);

 ir_variable *const fallthru_var = state->switch_state.is_fallthru_var;

 /* If not default case, ... */
 if (this->test_value != NULL__null) {
    /* Conditionally set fallthru state based on
     * comparison of cached test expression value to case label.
     */
    ir_rvalue *const label_rval = this->test_value->hir(instructions, state);
    ir_constant *label_const =
       label_rval->constant_expression_value(body.mem_ctx);

    if (!label_const) {
       YYLTYPE loc = this->test_value->get_location();

       _mesa_glsl_error(& loc, state,
                        "switch statement case label must be a "
                        "constant expression");

       /* Stuff a dummy value in to allow processing to continue. */
       label_const = body.constant(0);
    } else {
       hash_entry *entry =
             _mesa_hash_table_search(state->switch_state.labels_ht,
                                     &label_const->value.u[0]);

       if (entry) {
          const struct case_label *const l =
             (struct case_label *) entry->data;
          const ast_expression *const previous_label = l->ast;
          YYLTYPE loc = this->test_value->get_location();

          _mesa_glsl_error(& loc, state, "duplicate case value");

          loc = previous_label->get_location();
          _mesa_glsl_error(& loc, state, "this is the previous case label");
       } else {
          struct case_label *l = ralloc(state->switch_state.labels_ht,((struct case_label *) ralloc_size(state->switch_state.labels_ht
, sizeof(struct case_label)))
                                        struct case_label)((struct case_label *) ralloc_size(state->switch_state.labels_ht
, sizeof(struct case_label)));

          l->value = label_const->value.u[0];
          l->after_default = state->switch_state.previous_default != NULL__null;
          l->ast = this->test_value;

          _mesa_hash_table_insert(state->switch_state.labels_ht,
                                  &label_const->value.u[0],
                                  l);
       }
    }

    /* Create an r-value version of the ir_constant label here (after we may
     * have created a fake one in error cases) that can be passed to
     * apply_implicit_conversion below.
     */
    ir_rvalue *label = label_const;

    ir_rvalue *deref_test_var =
       new(body.mem_ctx) ir_dereference_variable(state->switch_state.test_var);

    /*
     * From GLSL 4.40 specification section 6.2 ("Selection"):
     *
     *     "The type of the init-expression value in a switch statement must
     *     be a scalar int or uint. The type of the constant-expression value
     *     in a case label also must be a scalar int or uint. When any pair
     *     of these values is tested for "equal value" and the types do not
     *     match, an implicit conversion will be done to convert the int to a
     *     uint (see section 4.1.10 “Implicit Conversions”) before the compare
     *     is done."
     */
    if (label->type != state->switch_state.test_var->type) {
       YYLTYPE loc = this->test_value->get_location();

       const glsl_type *type_a = label->type;
       const glsl_type *type_b = state->switch_state.test_var->type;

       /* Check if int->uint implicit conversion is supported. */
       bool integer_conversion_supported =
          glsl_type::int_type->can_implicitly_convert_to(glsl_type::uint_type,
                                                         state);

       if ((!type_a->is_integer_32() || !type_b->is_integer_32()) ||
            !integer_conversion_supported) {
          _mesa_glsl_error(&loc, state, "type mismatch with switch "
                           "init-expression and case label (%s != %s)",
                           type_a->name, type_b->name);
       } else {
          /* Conversion of the case label. */
          if (type_a->base_type == GLSL_TYPE_INT) {
             if (!apply_implicit_conversion(glsl_type::uint_type,
                                            label, state))
                _mesa_glsl_error(&loc, state, "implicit type conversion error");
          } else {
             /* Conversion of the init-expression value. */
             if (!apply_implicit_conversion(glsl_type::uint_type,
                                            deref_test_var, state))
                _mesa_glsl_error(&loc, state, "implicit type conversion error");
          }
       }

       /* If the implicit conversion was allowed, the types will already be
        * the same.  If the implicit conversion wasn't allowed, smash the
        * type of the label anyway.  This will prevent the expression
        * constructor (below) from failing an assertion.
        */
       label->type = deref_test_var->type;
    }

    body.emit(assign(fallthru_var,
                     logic_or(fallthru_var, equal(label, deref_test_var))));
 } else { /* default case */
    if (state->switch_state.previous_default) {
       YYLTYPE loc = this->get_location();
       _mesa_glsl_error(& loc, state,
                        "multiple default labels in one switch");

       loc = state->switch_state.previous_default->get_location();
       _mesa_glsl_error(& loc, state, "this is the first default label");
    }
    state->switch_state.previous_default = this;

    /* Set fallthru condition on 'run_default' bool. */
    body.emit(assign(fallthru_var,
                     logic_or(fallthru_var,
                              state->switch_state.run_default)));
 }

 /* Case statements do not have r-values. */
 return NULL__null;
7009}

7011void
7012ast_iteration_statement::condition_to_hir(exec_list *instructions,
                                        struct _mesa_glsl_parse_state *state)
7014{
 void *ctx = state;

 if (condition != NULL__null) {
    ir_rvalue *const cond =
       condition->hir(instructions, state);

    if ((cond == NULL__null)
        || !cond->type->is_boolean() || !cond->type->is_scalar()) {
       YYLTYPE loc = condition->get_location();

       _mesa_glsl_error(& loc, state,
                        "loop condition must be scalar boolean");
    } else {
       /* As the first code in the loop body, generate a block that looks
        * like 'if (!condition) break;' as the loop termination condition.
        */
       ir_rvalue *const not_cond =
          new(ctx) ir_expression(ir_unop_logic_not, cond);

       ir_if *const if_stmt = new(ctx) ir_if(not_cond);

       ir_jump *const break_stmt =
          new(ctx) ir_loop_jump(ir_loop_jump::jump_break);

       if_stmt->then_instructions.push_tail(break_stmt);
       instructions->push_tail(if_stmt);
    }
 }
7043}


7046ir_rvalue *
7047ast_iteration_statement::hir(exec_list *instructions,
                           struct _mesa_glsl_parse_state *state)
7049{
 void *ctx = state;

 /* For-loops and while-loops start a new scope, but do-while loops do not.
  */
 if (mode != ast_do_while)
    state->symbols->push_scope();

 if (init_statement != NULL__null)
    init_statement->hir(instructions, state);

 ir_loop *const stmt = new(ctx) ir_loop();
 instructions->push_tail(stmt);

 /* Track the current loop nesting. */
 ast_iteration_statement *nesting_ast = state->loop_nesting_ast;

 state->loop_nesting_ast = this;

 /* Likewise, indicate that following code is closest to a loop,
  * NOT closest to a switch.
  */
 bool saved_is_switch_innermost = state->switch_state.is_switch_innermost;
 state->switch_state.is_switch_innermost = false;

 if (mode != ast_do_while)
    condition_to_hir(&stmt->body_instructions, state);

 if (body != NULL__null)
    body->hir(& stmt->body_instructions, state);

 if (rest_expression != NULL__null)
    rest_expression->hir(& stmt->body_instructions, state);

 if (mode == ast_do_while)
    condition_to_hir(&stmt->body_instructions, state);

 if (mode != ast_do_while)
    state->symbols->pop_scope();

 /* Restore previous nesting before returning. */
 state->loop_nesting_ast = nesting_ast;
 state->switch_state.is_switch_innermost = saved_is_switch_innermost;

 /* Loops do not have r-values.
  */
 return NULL__null;
7096}


7099/**
* Determine if the given type is valid for establishing a default precision
* qualifier.
*
* From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
*
*     "The precision statement
*
*         precision precision-qualifier type;
*
*     can be used to establish a default precision qualifier. The type field
*     can be either int or float or any of the sampler types, and the
*     precision-qualifier can be lowp, mediump, or highp."
*
* GLSL ES 1.00 has similar language.  GLSL 1.30 doesn't allow precision
* qualifiers on sampler types, but this seems like an oversight (since the
* intention of including these in GLSL 1.30 is to allow compatibility with ES
* shaders).  So we allow int, float, and all sampler types regardless of GLSL
* version.
*/
7119static bool
7120is_valid_default_precision_type(const struct glsl_type *const type)
7121{
 if (type == NULL__null)
    return false;

 switch (type->base_type) {
 case GLSL_TYPE_INT:
 case GLSL_TYPE_FLOAT:
    /* "int" and "float" are valid, but vectors and matrices are not. */
    return type->vector_elements == 1 && type->matrix_columns == 1;
 case GLSL_TYPE_SAMPLER:
 case GLSL_TYPE_IMAGE:
 case GLSL_TYPE_ATOMIC_UINT:
    return true;
 default:
    return false;
 }
7137}


7140ir_rvalue *
7141ast_type_specifier::hir(exec_list *instructions,
                      struct _mesa_glsl_parse_state *state)
7143{
 if (this->default_precision == ast_precision_none && this->structure == NULL__null)
    return NULL__null;

 YYLTYPE loc = this->get_location();

 /* If this is a precision statement, check that the type to which it is
  * applied is either float or int.
  *
  * From section 4.5.3 of the GLSL 1.30 spec:
  *    "The precision statement
  *       precision precision-qualifier type;
  *    can be used to establish a default precision qualifier. The type
  *    field can be either int or float [...].  Any other types or
  *    qualifiers will result in an error.
  */
 if (this->default_precision != ast_precision_none) {
    if (!state->check_precision_qualifiers_allowed(&loc))
       return NULL__null;

    if (this->structure != NULL__null) {
       _mesa_glsl_error(&loc, state,
                        "precision qualifiers do not apply to structures");
       return NULL__null;
    }

    if (this->array_specifier != NULL__null) {
       _mesa_glsl_error(&loc, state,
                        "default precision statements do not apply to "
                        "arrays");
       return NULL__null;
    }

    const struct glsl_type *const type =
       state->symbols->get_type(this->type_name);
    if (!is_valid_default_precision_type(type)) {
       _mesa_glsl_error(&loc, state,
                        "default precision statements apply only to "
                        "float, int, and opaque types");
       return NULL__null;
    }

    if (state->es_shader) {
       /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
        * spec says:
        *
        *     "Non-precision qualified declarations will use the precision
        *     qualifier specified in the most recent precision statement
        *     that is still in scope. The precision statement has the same
        *     scoping rules as variable declarations. If it is declared
        *     inside a compound statement, its effect stops at the end of
        *     the innermost statement it was declared in. Precision
        *     statements in nested scopes override precision statements in
        *     outer scopes. Multiple precision statements for the same basic
        *     type can appear inside the same scope, with later statements
        *     overriding earlier statements within that scope."
        *
        * Default precision specifications follow the same scope rules as
        * variables.  So, we can track the state of the default precision
        * qualifiers in the symbol table, and the rules will just work.  This
        * is a slight abuse of the symbol table, but it has the semantics
        * that we want.
        */
       state->symbols->add_default_precision_qualifier(this->type_name,
                                                       this->default_precision);
    }

    {
       void *ctx = state;

       const char* precision_type = NULL__null;
       switch (this->default_precision) {
       case GLSL_PRECISION_HIGH:
          precision_type = "highp";
          break;
       case GLSL_PRECISION_MEDIUM:
          precision_type = "mediump";
          break;
       case GLSL_PRECISION_LOW:
          precision_type = "lowp";
          break;
       case GLSL_PRECISION_NONE:
          precision_type = "";
          break;
       }

       char* precision_statement = ralloc_asprintf(ctx, "precision %s %s", precision_type, this->type_name);
       ir_precision_statement *const stmt = new(ctx) ir_precision_statement(precision_statement);

       instructions->push_head(stmt);
    }

    return NULL__null;
 }

 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
  * process_record_constructor() can do type-checking on C-style initializer
  * expressions of structs, but ast_struct_specifier should only be translated
  * to HIR if it is declaring the type of a structure.
  *
  * The ->is_declaration field is false for initializers of variables
  * declared separately from the struct's type definition.
  *
  *    struct S { ... };              (is_declaration = true)
  *    struct T { ... } t = { ... };  (is_declaration = true)
  *    S s = { ... };                 (is_declaration = false)
  */
 if (this->structure != NULL__null && this->structure->is_declaration)
    return this->structure->hir(instructions, state);

 return NULL__null;
7254}


7257/**
* Process a structure or interface block tree into an array of structure fields
*
* After parsing, where there are some syntax differnces, structures and
* interface blocks are almost identical.  They are similar enough that the
* AST for each can be processed the same way into a set of
* \c glsl_struct_field to describe the members.
*
* If we're processing an interface block, var_mode should be the type of the
* interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
* ir_var_shader_storage).  If we're processing a structure, var_mode should be
* ir_var_auto.
*
* \return
* The number of fields processed.  A pointer to the array structure fields is
* stored in \c *fields_ret.
*/
7274static unsigned
7275ast_process_struct_or_iface_block_members(exec_list *instructions,
                                        struct _mesa_glsl_parse_state *state,
                                        exec_list *declarations,
                                        glsl_struct_field **fields_ret,
                                        bool is_interface,
                                        enum glsl_matrix_layout matrix_layout,
                                        bool allow_reserved_names,
                                        ir_variable_mode var_mode,
                                        ast_type_qualifier *layout,
                                        unsigned block_stream,
                                        unsigned block_xfb_buffer,
                                        unsigned block_xfb_offset,
                                        unsigned expl_location,
                                        unsigned expl_align)
7289{
 unsigned decl_count = 0;
 unsigned next_offset = 0;

 /* Make an initial pass over the list of fields to determine how
  * many there are.  Each element in this list is an ast_declarator_list.
  * This means that we actually need to count the number of elements in the
  * 'declarations' list in each of the elements.
  */
 foreach_list_typed (ast_declarator_list, decl_list, link, declarations)for (ast_declarator_list * decl_list = (!exec_node_is_tail_sentinel
((declarations)->head_sentinel.next) ? ((ast_declarator_list
 *) (((uintptr_t) (declarations)->head_sentinel.next) - ((
(char *) &((ast_declarator_list *) (declarations)->head_sentinel
.next)->link) - ((char *) (declarations)->head_sentinel
.next)))) : __null); (decl_list) != __null; (decl_list) = (!exec_node_is_tail_sentinel
((decl_list)->link.next) ? ((ast_declarator_list *) (((uintptr_t
) (decl_list)->link.next) - (((char *) &((ast_declarator_list
 *) (decl_list)->link.next)->link) - ((char *) (decl_list
)->link.next)))) : __null)) {
    decl_count += decl_list->declarations.length();
 }

 /* Allocate storage for the fields and process the field
  * declarations.  As the declarations are processed, try to also convert
  * the types to HIR.  This ensures that structure definitions embedded in
  * other structure definitions or in interface blocks are processed.
  */
 glsl_struct_field *const fields = rzalloc_array(state, glsl_struct_field,((glsl_struct_field *) rzalloc_array_size(state, sizeof(glsl_struct_field
), decl_count))
                                                 decl_count)((glsl_struct_field *) rzalloc_array_size(state, sizeof(glsl_struct_field
), decl_count));

 bool first_member = true;
 bool first_member_has_explicit_location = false;

 unsigned i = 0;
 foreach_list_typed (ast_declarator_list, decl_list, link, declarations)for (ast_declarator_list * decl_list = (!exec_node_is_tail_sentinel
((declarations)->head_sentinel.next) ? ((ast_declarator_list
 *) (((uintptr_t) (declarations)->head_sentinel.next) - ((
(char *) &((ast_declarator_list *) (declarations)->head_sentinel
.next)->link) - ((char *) (declarations)->head_sentinel
.next)))) : __null); (decl_list) != __null; (decl_list) = (!exec_node_is_tail_sentinel
((decl_list)->link.next) ? ((ast_declarator_list *) (((uintptr_t
) (decl_list)->link.next) - (((char *) &((ast_declarator_list
 *) (decl_list)->link.next)->link) - ((char *) (decl_list
)->link.next)))) : __null)) {
    const char *type_name;
    YYLTYPE loc = decl_list->get_location();

    decl_list->type->specifier->hir(instructions, state);

    /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
     *
     *    "Anonymous structures are not supported; so embedded structures
     *    must have a declarator. A name given to an embedded struct is
     *    scoped at the same level as the struct it is embedded in."
     *
     * The same section of the  GLSL 1.20 spec says:
     *
     *    "Anonymous structures are not supported. Embedded structures are
     *    not supported."
     *
     * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
     * embedded structures in 1.10 only.
     */
    if (state->language_version != 110 &&
        decl_list->type->specifier->structure != NULL__null)
       _mesa_glsl_error(&loc, state,
                        "embedded structure declarations are not allowed");

    const glsl_type *decl_type =
       decl_list->type->glsl_type(& type_name, state);

    const struct ast_type_qualifier *const qual =
       &decl_list->type->qualifier;

    /* From section 4.3.9 of the GLSL 4.40 spec:
     *
     *    "[In interface blocks] opaque types are not allowed."
     *
     * It should be impossible for decl_type to be NULL here.  Cases that
     * might naturally lead to decl_type being NULL, especially for the
     * is_interface case, will have resulted in compilation having
     * already halted due to a syntax error.
     */
    assert(decl_type)(static_cast <bool> (decl_type) ? void (0) : __assert_fail
 ("decl_type", __builtin_FILE (), __builtin_LINE (), __extension__
 __PRETTY_FUNCTION__));

    if (is_interface) {
       /* From section 4.3.7 of the ARB_bindless_texture spec:
        *
        *    "(remove the following bullet from the last list on p. 39,
        *     thereby permitting sampler types in interface blocks; image
        *     types are also permitted in blocks by this extension)"
        *
        *     * sampler types are not allowed
        */
       if (decl_type->contains_atomic() ||
           (!state->has_bindless() && decl_type->contains_opaque())) {
          _mesa_glsl_error(&loc, state, "uniform/buffer in non-default "
                           "interface block contains %s variable",
                           state->has_bindless() ? "atomic" : "opaque");
       }
    } else {
       if (decl_type->contains_atomic()) {
          /* From section 4.1.7.3 of the GLSL 4.40 spec:
           *
           *    "Members of structures cannot be declared as atomic counter
           *     types."
           */
          _mesa_glsl_error(&loc, state, "atomic counter in structure");
       }

       if (!state->has_bindless() && decl_type->contains_image()) {
          /* FINISHME: Same problem as with atomic counters.
           * FINISHME: Request clarification from Khronos and add
           * FINISHME: spec quotation here.
           */
          _mesa_glsl_error(&loc, state, "image in structure");
       }
    }

    if (qual->flags.q.explicit_binding) {
       _mesa_glsl_error(&loc, state,
                        "binding layout qualifier cannot be applied "
                        "to struct or interface block members");
    }

    if (is_interface) {
       if (!first_member) {
          if (!layout->flags.q.explicit_location &&
              ((first_member_has_explicit_location &&
                !qual->flags.q.explicit_location) ||
               (!first_member_has_explicit_location &&
                qual->flags.q.explicit_location))) {
             _mesa_glsl_error(&loc, state,
                              "when block-level location layout qualifier "
                              "is not supplied either all members must "
                              "have a location layout qualifier or all "
                              "members must not have a location layout "
                              "qualifier");
          }
       } else {
          first_member = false;
          first_member_has_explicit_location =
             qual->flags.q.explicit_location;
       }
    }

    if (qual->flags.q.std140 ||
        qual->flags.q.std430 ||
        qual->flags.q.packed ||
        qual->flags.q.shared) {
       _mesa_glsl_error(&loc, state,
                        "uniform/shader storage block layout qualifiers "
                        "std140, std430, packed, and shared can only be "
                        "applied to uniform/shader storage blocks, not "
                        "members");
    }

    if (qual->flags.q.constant) {
       _mesa_glsl_error(&loc, state,
                        "const storage qualifier cannot be applied "
                        "to struct or interface block members");
    }

    validate_memory_qualifier_for_type(state, &loc, qual, decl_type);
    validate_image_format_qualifier_for_type(state, &loc, qual, decl_type);

    /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
     *
     *   "A block member may be declared with a stream identifier, but
     *   the specified stream must match the stream associated with the
     *   containing block."
     */
    if (qual->flags.q.explicit_stream) {
       unsigned qual_stream;
       if (process_qualifier_constant(state, &loc, "stream",
                                      qual->stream, &qual_stream) &&
           qual_stream != block_stream) {
          _mesa_glsl_error(&loc, state, "stream layout qualifier on "
                           "interface block member does not match "
                           "the interface block (%u vs %u)", qual_stream,
                           block_stream);
       }
    }

    int xfb_buffer;
    unsigned explicit_xfb_buffer = 0;
    if (qual->flags.q.explicit_xfb_buffer) {
       unsigned qual_xfb_buffer;
       if (process_qualifier_constant(state, &loc, "xfb_buffer",
                                      qual->xfb_buffer, &qual_xfb_buffer)) {
          explicit_xfb_buffer = 1;
          if (qual_xfb_buffer != block_xfb_buffer)
             _mesa_glsl_error(&loc, state, "xfb_buffer layout qualifier on "
                              "interface block member does not match "
                              "the interface block (%u vs %u)",
                              qual_xfb_buffer, block_xfb_buffer);
       }
       xfb_buffer = (int) qual_xfb_buffer;
    } else {
       if (layout)
          explicit_xfb_buffer = layout->flags.q.explicit_xfb_buffer;
       xfb_buffer = (int) block_xfb_buffer;
    }

    int xfb_stride = -1;
    if (qual->flags.q.explicit_xfb_stride) {
       unsigned qual_xfb_stride;
       if (process_qualifier_constant(state, &loc, "xfb_stride",
                                      qual->xfb_stride, &qual_xfb_stride)) {
          xfb_stride = (int) qual_xfb_stride;
       }
    }

    if (qual->flags.q.uniform && qual->has_interpolation()) {
       _mesa_glsl_error(&loc, state,
                        "interpolation qualifiers cannot be used "
                        "with uniform interface blocks");
    }

    if ((qual->flags.q.uniform || !is_interface) &&
        qual->has_auxiliary_storage()) {
       _mesa_glsl_error(&loc, state,
                        "auxiliary storage qualifiers cannot be used "
                        "in uniform blocks or structures.");
    }

    if (qual->flags.q.row_major || qual->flags.q.column_major) {
       if (!qual->flags.q.uniform && !qual->flags.q.buffer) {
          _mesa_glsl_error(&loc, state,
                           "row_major and column_major can only be "
                           "applied to interface blocks");
       } else
          validate_matrix_layout_for_type(state, &loc, decl_type, NULL__null);
    }

    foreach_list_typed (ast_declaration, decl, link,for (ast_declaration * decl = (!exec_node_is_tail_sentinel((&
decl_list->declarations)->head_sentinel.next) ? ((ast_declaration
 *) (((uintptr_t) (&decl_list->declarations)->head_sentinel
.next) - (((char *) &((ast_declaration *) (&decl_list
->declarations)->head_sentinel.next)->link) - ((char
 *) (&decl_list->declarations)->head_sentinel.next)
))) : __null); (decl) != __null; (decl) = (!exec_node_is_tail_sentinel
((decl)->link.next) ? ((ast_declaration *) (((uintptr_t) (
decl)->link.next) - (((char *) &((ast_declaration *) (
decl)->link.next)->link) - ((char *) (decl)->link.next
)))) : __null))
                        &decl_list->declarations)for (ast_declaration * decl = (!exec_node_is_tail_sentinel((&
decl_list->declarations)->head_sentinel.next) ? ((ast_declaration
 *) (((uintptr_t) (&decl_list->declarations)->head_sentinel
.next) - (((char *) &((ast_declaration *) (&decl_list
->declarations)->head_sentinel.next)->link) - ((char
 *) (&decl_list->declarations)->head_sentinel.next)
))) : __null); (decl) != __null; (decl) = (!exec_node_is_tail_sentinel
((decl)->link.next) ? ((ast_declaration *) (((uintptr_t) (
decl)->link.next) - (((char *) &((ast_declaration *) (
decl)->link.next)->link) - ((char *) (decl)->link.next
)))) : __null)) {
       YYLTYPE loc = decl->get_location();

       if (!allow_reserved_names)
          validate_identifier(decl->identifier, loc, state);

       const struct glsl_type *field_type =
          process_array_type(&loc, decl_type, decl->array_specifier, state);
       validate_array_dimensions(field_type, state, &loc);
       fields[i].type = field_type;
       fields[i].name = decl->identifier;
       fields[i].interpolation =
          interpret_interpolation_qualifier(qual, field_type,
                                            var_mode, state, &loc);
       fields[i].centroid = qual->flags.q.centroid ? 1 : 0;
       fields[i].sample = qual->flags.q.sample ? 1 : 0;
       fields[i].patch = qual->flags.q.patch ? 1 : 0;
       fields[i].offset = -1;
       fields[i].explicit_xfb_buffer = explicit_xfb_buffer;
       fields[i].xfb_buffer = xfb_buffer;
       fields[i].xfb_stride = xfb_stride;

       if (qual->flags.q.explicit_location) {
          unsigned qual_location;
          if (process_qualifier_constant(state, &loc, "location",
                                         qual->location, &qual_location)) {
             fields[i].location = qual_location +
                (fields[i].patch ? VARYING_SLOT_PATCH0((VARYING_SLOT_VAR0 + 32)) : VARYING_SLOT_VAR0);
             expl_location = fields[i].location +
                fields[i].type->count_attribute_slots(false);
          }
       } else {
          if (layout && layout->flags.q.explicit_location) {
             fields[i].location = expl_location;
             expl_location += fields[i].type->count_attribute_slots(false);
          } else {
             fields[i].location = -1;
          }
       }

       /* Offset can only be used with std430 and std140 layouts an initial
        * value of 0 is used for error detection.
        */
       unsigned align = 0;
       unsigned size = 0;
       if (layout) {
          bool row_major;
          if (qual->flags.q.row_major ||
              matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR) {
             row_major = true;
          } else {
             row_major = false;
          }

          if(layout->flags.q.std140) {
             align = field_type->std140_base_alignment(row_major);
             size = field_type->std140_size(row_major);
          } else if (layout->flags.q.std430) {
             align = field_type->std430_base_alignment(row_major);
             size = field_type->std430_size(row_major);
          }
       }

       if (qual->flags.q.explicit_offset) {
          unsigned qual_offset;
          if (process_qualifier_constant(state, &loc, "offset",
                                         qual->offset, &qual_offset)) {
             if (align != 0 && size != 0) {
                 if (next_offset > qual_offset)
                    _mesa_glsl_error(&loc, state, "layout qualifier "
                                     "offset overlaps previous member");

                if (qual_offset % align) {
                   _mesa_glsl_error(&loc, state, "layout qualifier offset "
                                    "must be a multiple of the base "
                                    "alignment of %s", field_type->name);
                }
                fields[i].offset = qual_offset;
                next_offset = qual_offset + size;
             } else {
                _mesa_glsl_error(&loc, state, "offset can only be used "
                                 "with std430 and std140 layouts");
             }
          }
       }

       if (qual->flags.q.explicit_align || expl_align != 0) {
          unsigned offset = fields[i].offset != -1 ? fields[i].offset :
             next_offset;
          if (align == 0 || size == 0) {
             _mesa_glsl_error(&loc, state, "align can only be used with "
                              "std430 and std140 layouts");
          } else if (qual->flags.q.explicit_align) {
             unsigned member_align;
             if (process_qualifier_constant(state, &loc, "align",
                                            qual->align, &member_align)) {
                if (member_align == 0 ||
                    member_align & (member_align - 1)) {
                   _mesa_glsl_error(&loc, state, "align layout qualifier "
                                    "is not a power of 2");
                } else {
                   fields[i].offset = glsl_align(offset, member_align);
                   next_offset = fields[i].offset + size;
                }
             }
          } else {
             fields[i].offset = glsl_align(offset, expl_align);
             next_offset = fields[i].offset + size;
          }
       } else if (!qual->flags.q.explicit_offset) {
          if (align != 0 && size != 0)
             next_offset = glsl_align(next_offset, align) + size;
       }

       /* From the ARB_enhanced_layouts spec:
        *
        *    "The given offset applies to the first component of the first
        *    member of the qualified entity.  Then, within the qualified
        *    entity, subsequent components are each assigned, in order, to
        *    the next available offset aligned to a multiple of that
        *    component's size.  Aggregate types are flattened down to the
        *    component level to get this sequence of components."
        */
       if (qual->flags.q.explicit_xfb_offset) {
          unsigned xfb_offset;
          if (process_qualifier_constant(state, &loc, "xfb_offset",
                                         qual->offset, &xfb_offset)) {
             fields[i].offset = xfb_offset;
             block_xfb_offset = fields[i].offset +
                4 * field_type->component_slots();
          }
       } else {
          if (layout && layout->flags.q.explicit_xfb_offset) {
             unsigned align = field_type->is_64bit() ? 8 : 4;
             fields[i].offset = glsl_align(block_xfb_offset, align);
             block_xfb_offset += 4 * field_type->component_slots();
          }
       }

       /* Propogate row- / column-major information down the fields of the
        * structure or interface block.  Structures need this data because
        * the structure may contain a structure that contains ... a matrix
        * that need the proper layout.
        */
       if (is_interface && layout &&
           (layout->flags.q.uniform || layout->flags.q.buffer) &&
           (field_type->without_array()->is_matrix()
            || field_type->without_array()->is_struct())) {
          /* If no layout is specified for the field, inherit the layout
           * from the block.
           */
          fields[i].matrix_layout = matrix_layout;

          if (qual->flags.q.row_major)
             fields[i].matrix_layout = GLSL_MATRIX_LAYOUT_ROW_MAJOR;
          else if (qual->flags.q.column_major)
             fields[i].matrix_layout = GLSL_MATRIX_LAYOUT_COLUMN_MAJOR;

          /* If we're processing an uniform or buffer block, the matrix
           * layout must be decided by this point.
           */
          assert(fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR(static_cast <bool> (fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR
 || fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
) ? void (0) : __assert_fail ("fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR || fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_COLUMN_MAJOR"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
))
                 || fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_COLUMN_MAJOR)(static_cast <bool> (fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR
 || fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
) ? void (0) : __assert_fail ("fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR || fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_COLUMN_MAJOR"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
       }

       /* Memory qualifiers are allowed on buffer and image variables, while
        * the format qualifier is only accepted for images.
        */
       if (var_mode == ir_var_shader_storage ||
           field_type->without_array()->is_image()) {
          /* For readonly and writeonly qualifiers the field definition,
           * if set, overwrites the layout qualifier.
           */
          if (qual->flags.q.read_only || qual->flags.q.write_only) {
             fields[i].memory_read_only = qual->flags.q.read_only;
             fields[i].memory_write_only = qual->flags.q.write_only;
          } else {
             fields[i].memory_read_only =
                layout ? layout->flags.q.read_only : 0;
             fields[i].memory_write_only =
                layout ? layout->flags.q.write_only : 0;
          }

          /* For other qualifiers, we set the flag if either the layout
           * qualifier or the field qualifier are set
           */
          fields[i].memory_coherent = qual->flags.q.coherent ||
                                      (layout && layout->flags.q.coherent);
          fields[i].memory_volatile = qual->flags.q._volatile ||
                                      (layout && layout->flags.q._volatile);
          fields[i].memory_restrict = qual->flags.q.restrict_flag ||
                                      (layout && layout->flags.q.restrict_flag);

          if (field_type->without_array()->is_image()) {
             if (qual->flags.q.explicit_image_format) {
                if (qual->image_base_type !=
                    field_type->without_array()->sampled_type) {
                   _mesa_glsl_error(&loc, state, "format qualifier doesn't "
                                    "match the base data type of the image");
                }

                fields[i].image_format = qual->image_format;
             } else {
                if (!qual->flags.q.write_only) {
                   _mesa_glsl_error(&loc, state, "image not qualified with "
                                    "`writeonly' must have a format layout "
                                    "qualifier");
                }

                fields[i].image_format = PIPE_FORMAT_NONE;
             }
          }
       }

       /* Precision qualifiers do not hold any meaning in Desktop GLSL */
       if (state->es_shader) {
          fields[i].precision = select_gles_precision(qual->precision,
                                                      field_type,
                                                      state,
                                                      &loc);
       } else {
          fields[i].precision = qual->precision;
       }

       i++;
    }
 }

 assert(i == decl_count)(static_cast <bool> (i == decl_count) ? void (0) : __assert_fail
 ("i == decl_count", __builtin_FILE (), __builtin_LINE (), __extension__
 __PRETTY_FUNCTION__));

 *fields_ret = fields;
 return decl_count;
7739}


7742ir_rvalue *
7743ast_struct_specifier::hir(exec_list *instructions,
                        struct _mesa_glsl_parse_state *state)
7745{
 YYLTYPE loc = this->get_location();

 unsigned expl_location = 0;
 if (layout && layout->flags.q.explicit_location) {
    if (!process_qualifier_constant(state, &loc, "location",
                                    layout->location, &expl_location)) {
       return NULL__null;
    } else {
       expl_location = VARYING_SLOT_VAR0 + expl_location;
    }
 }

 glsl_struct_field *fields;
 unsigned decl_count =
    ast_process_struct_or_iface_block_members(instructions,
                                              state,
                                              &this->declarations,
                                              &fields,
                                              false,
                                              GLSL_MATRIX_LAYOUT_INHERITED,
                                              false /* allow_reserved_names */,
                                              ir_var_auto,
                                              layout,
                                              0, /* for interface only */
                                              0, /* for interface only */
                                              0, /* for interface only */
                                              expl_location,
                                              0 /* for interface only */);

 validate_identifier(this->name, loc, state);

 type = glsl_type::get_struct_instance(fields, decl_count, this->name);

 if (!type->is_anonymous() && !state->symbols->add_type(name, type)) {
    const glsl_type *match = state->symbols->get_type(name);
    /* allow struct matching for desktop GL - older UE4 does this */
    if (match != NULL__null && state->is_version(130, 0) && match->record_compare(type, true, false))
       _mesa_glsl_warning(& loc, state, "struct `%s' previously defined", name);
    else
       _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name);
 } else {
    const glsl_type **s = reralloc(state, state->user_structures,((const glsl_type * *) reralloc_array_size(state, state->user_structures
, sizeof(const glsl_type *), state->num_user_structures + 1
))
                                   const glsl_type *,((const glsl_type * *) reralloc_array_size(state, state->user_structures
, sizeof(const glsl_type *), state->num_user_structures + 1
))
                                   state->num_user_structures + 1)((const glsl_type * *) reralloc_array_size(state, state->user_structures
, sizeof(const glsl_type *), state->num_user_structures + 1
));
    if (s != NULL__null) {
       s[state->num_user_structures] = type;
       state->user_structures = s;
       state->num_user_structures++;

       ir_typedecl_statement* stmt = new(state) ir_typedecl_statement(type);
       /* Push the struct declarations to the top.
        * However, do not insert declarations before default precision
        * statements or other declarations
        */
       ir_instruction* before_node = (ir_instruction*)instructions->get_head();
       while (before_node &&
              (before_node->ir_type == ir_type_precision ||
               before_node->ir_type == ir_type_typedecl))
          before_node = (ir_instruction*)before_node->next;
          if (before_node)
             before_node->insert_before(stmt);
          else
             instructions->push_head(stmt);
    }
 }

 /* Structure type definitions do not have r-values.
  */
 return NULL__null;
7815}


7818/**
* Visitor class which detects whether a given interface block has been used.
*/
7821class interface_block_usage_visitor : public ir_hierarchical_visitor
7822{
7823public:
 interface_block_usage_visitor(ir_variable_mode mode, const glsl_type *block)
    : mode(mode), block(block), found(false)
 {
 }

 virtual ir_visitor_status visit(ir_dereference_variable *ir)
 {
    if (ir->var->data.mode == mode && ir->var->get_interface_type() == block) {
       found = true;
       return visit_stop;
    }
    return visit_continue;
 }

 bool usage_found() const
 {
    return this->found;
 }

7843private:
 ir_variable_mode mode;
 const glsl_type *block;
 bool found;
7847};

7849static bool
7850is_unsized_array_last_element(ir_variable *v)
7851{
 const glsl_type *interface_type = v->get_interface_type();
 int length = interface_type->length;

 assert(v->type->is_unsized_array())(static_cast <bool> (v->type->is_unsized_array())
 ? void (0) : __assert_fail ("v->type->is_unsized_array()"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

 /* Check if it is the last element of the interface */
 if (strcmp(interface_type->fields.structure[length-1].name, v->name) == 0)
    return true;
 return false;
7861}

7863static void
7864apply_memory_qualifiers(ir_variable *var, glsl_struct_field field)
7865{
 var->data.memory_read_only = field.memory_read_only;
 var->data.memory_write_only = field.memory_write_only;
 var->data.memory_coherent = field.memory_coherent;
 var->data.memory_volatile = field.memory_volatile;
 var->data.memory_restrict = field.memory_restrict;
7871}

7873ir_rvalue *
7874ast_interface_block::hir(exec_list *instructions,
                       struct _mesa_glsl_parse_state *state)
7876{
 YYLTYPE loc = this->get_location();

 /* Interface blocks must be declared at global scope */
 if (state->current_function != NULL__null) {
    _mesa_glsl_error(&loc, state,
                     "Interface block `%s' must be declared "
                     "at global scope",
                     this->block_name);
 }

 /* Validate qualifiers:
  *
  * - Layout Qualifiers as per the table in Section 4.4
  *   ("Layout Qualifiers") of the GLSL 4.50 spec.
  *
  * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
  *   GLSL 4.50 spec:
  *
  *     "Additionally, memory qualifiers may also be used in the declaration
  *      of shader storage blocks"
  *
  * Note the table in Section 4.4 says std430 is allowed on both uniform and
  * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
  * Layout Qualifiers) of the GLSL 4.50 spec says:
  *
  *    "The std430 qualifier is supported only for shader storage blocks;
  *    using std430 on a uniform block will result in a compile-time error."
  */
 ast_type_qualifier allowed_blk_qualifiers;
 allowed_blk_qualifiers.flags.i = 0;
 if (this->layout.flags.q.buffer || this->layout.flags.q.uniform) {
    allowed_blk_qualifiers.flags.q.shared = 1;
    allowed_blk_qualifiers.flags.q.packed = 1;
    allowed_blk_qualifiers.flags.q.std140 = 1;
    allowed_blk_qualifiers.flags.q.row_major = 1;
    allowed_blk_qualifiers.flags.q.column_major = 1;
    allowed_blk_qualifiers.flags.q.explicit_align = 1;
    allowed_blk_qualifiers.flags.q.explicit_binding = 1;
    if (this->layout.flags.q.buffer) {
       allowed_blk_qualifiers.flags.q.buffer = 1;
       allowed_blk_qualifiers.flags.q.std430 = 1;
       allowed_blk_qualifiers.flags.q.coherent = 1;
       allowed_blk_qualifiers.flags.q._volatile = 1;
       allowed_blk_qualifiers.flags.q.restrict_flag = 1;
       allowed_blk_qualifiers.flags.q.read_only = 1;
       allowed_blk_qualifiers.flags.q.write_only = 1;
    } else {
       allowed_blk_qualifiers.flags.q.uniform = 1;
    }
 } else {
    /* Interface block */
    assert(this->layout.flags.q.in || this->layout.flags.q.out)(static_cast <bool> (this->layout.flags.q.in || this
->layout.flags.q.out) ? void (0) : __assert_fail ("this->layout.flags.q.in || this->layout.flags.q.out"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

    allowed_blk_qualifiers.flags.q.explicit_location = 1;
    if (this->layout.flags.q.out) {
       allowed_blk_qualifiers.flags.q.out = 1;
       if (state->stage == MESA_SHADER_GEOMETRY ||
        state->stage == MESA_SHADER_TESS_CTRL ||
        state->stage == MESA_SHADER_TESS_EVAL ||
        state->stage == MESA_SHADER_VERTEX ) {
          allowed_blk_qualifiers.flags.q.explicit_xfb_offset = 1;
          allowed_blk_qualifiers.flags.q.explicit_xfb_buffer = 1;
          allowed_blk_qualifiers.flags.q.xfb_buffer = 1;
          allowed_blk_qualifiers.flags.q.explicit_xfb_stride = 1;
          allowed_blk_qualifiers.flags.q.xfb_stride = 1;
          if (state->stage == MESA_SHADER_GEOMETRY) {
             allowed_blk_qualifiers.flags.q.stream = 1;
             allowed_blk_qualifiers.flags.q.explicit_stream = 1;
          }
          if (state->stage == MESA_SHADER_TESS_CTRL) {
             allowed_blk_qualifiers.flags.q.patch = 1;
          }
       }
    } else {
       allowed_blk_qualifiers.flags.q.in = 1;
       if (state->stage == MESA_SHADER_TESS_EVAL) {
          allowed_blk_qualifiers.flags.q.patch = 1;
       }
    }
 }

 this->layout.validate_flags(&loc, state, allowed_blk_qualifiers,
                             "invalid qualifier for block",
                             this->block_name);

 enum glsl_interface_packing packing;
 if (this->layout.flags.q.std140) {
    packing = GLSL_INTERFACE_PACKING_STD140;
 } else if (this->layout.flags.q.packed) {
    packing = GLSL_INTERFACE_PACKING_PACKED;
 } else if (this->layout.flags.q.std430) {
    packing = GLSL_INTERFACE_PACKING_STD430;
 } else {
    /* The default layout is shared.
     */
    packing = GLSL_INTERFACE_PACKING_SHARED;
 }

 ir_variable_mode var_mode;
 const char *iface_type_name;
 if (this->layout.flags.q.in) {
    var_mode = ir_var_shader_in;
    iface_type_name = "in";
 } else if (this->layout.flags.q.out) {
    var_mode = ir_var_shader_out;
    iface_type_name = "out";
 } else if (this->layout.flags.q.uniform) {
    var_mode = ir_var_uniform;
    iface_type_name = "uniform";
 } else if (this->layout.flags.q.buffer) {
    var_mode = ir_var_shader_storage;
    iface_type_name = "buffer";
 } else {
    var_mode = ir_var_auto;
    iface_type_name = "UNKNOWN";
    assert(!"interface block layout qualifier not found!")(static_cast <bool> (!"interface block layout qualifier not found!"
) ? void (0) : __assert_fail ("!\"interface block layout qualifier not found!\""
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));
 }

 enum glsl_matrix_layout matrix_layout = GLSL_MATRIX_LAYOUT_INHERITED;
 if (this->layout.flags.q.row_major)
    matrix_layout = GLSL_MATRIX_LAYOUT_ROW_MAJOR;
 else if (this->layout.flags.q.column_major)
    matrix_layout = GLSL_MATRIX_LAYOUT_COLUMN_MAJOR;

 bool redeclaring_per_vertex = strcmp(this->block_name, "gl_PerVertex") == 0;
 exec_list declared_variables;
 glsl_struct_field *fields;

 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
  * that we don't have incompatible qualifiers
  */
 if (this->layout.flags.q.read_only && this->layout.flags.q.write_only) {
    _mesa_glsl_error(&loc, state,
                     "Interface block sets both readonly and writeonly");
 }

 unsigned qual_stream;
 if (!process_qualifier_constant(state, &loc, "stream", this->layout.stream,
                                 &qual_stream) ||
     !validate_stream_qualifier(&loc, state, qual_stream)) {
    /* If the stream qualifier is invalid it doesn't make sense to continue
     * on and try to compare stream layouts on member variables against it
     * so just return early.
     */
    return NULL__null;
 }

 unsigned qual_xfb_buffer;
 if (!process_qualifier_constant(state, &loc, "xfb_buffer",
                                 layout.xfb_buffer, &qual_xfb_buffer) ||
     !validate_xfb_buffer_qualifier(&loc, state, qual_xfb_buffer)) {
    return NULL__null;
 }

 unsigned qual_xfb_offset;
 if (layout.flags.q.explicit_xfb_offset) {
    if (!process_qualifier_constant(state, &loc, "xfb_offset",
                                    layout.offset, &qual_xfb_offset)) {
       return NULL__null;
    }
 }

 unsigned qual_xfb_stride;
 if (layout.flags.q.explicit_xfb_stride) {
    if (!process_qualifier_constant(state, &loc, "xfb_stride",
                                    layout.xfb_stride, &qual_xfb_stride)) {
       return NULL__null;
    }
 }

 unsigned expl_location = 0;
 if (layout.flags.q.explicit_location) {
    if (!process_qualifier_constant(state, &loc, "location",
                                    layout.location, &expl_location)) {
       return NULL__null;
    } else {
       expl_location += this->layout.flags.q.patch ? VARYING_SLOT_PATCH0((VARYING_SLOT_VAR0 + 32))
                                                   : VARYING_SLOT_VAR0;
    }
 }

 unsigned expl_align = 0;
 if (layout.flags.q.explicit_align) {
    if (!process_qualifier_constant(state, &loc, "align",
                                    layout.align, &expl_align)) {
       return NULL__null;
    } else {
       if (expl_align == 0 || expl_align & (expl_align - 1)) {
          _mesa_glsl_error(&loc, state, "align layout qualifier is not a "
                           "power of 2.");
          return NULL__null;
       }
    }
 }

 unsigned int num_variables =
    ast_process_struct_or_iface_block_members(&declared_variables,
                                              state,
                                              &this->declarations,
                                              &fields,
                                              true,
                                              matrix_layout,
                                              redeclaring_per_vertex,
                                              var_mode,
                                              &this->layout,
                                              qual_stream,
                                              qual_xfb_buffer,
                                              qual_xfb_offset,
                                              expl_location,
                                              expl_align);

 if (!redeclaring_per_vertex) {
    validate_identifier(this->block_name, loc, state);

    /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
     *
     *     "Block names have no other use within a shader beyond interface
     *     matching; it is a compile-time error to use a block name at global
     *     scope for anything other than as a block name."
     */
    ir_variable *var = state->symbols->get_variable(this->block_name);
    if (var && !var->type->is_interface()) {
       _mesa_glsl_error(&loc, state, "Block name `%s' is "
                        "already used in the scope.",
                        this->block_name);
    }
 }

 const glsl_type *earlier_per_vertex = NULL__null;
 if (redeclaring_per_vertex) {
    /* Find the previous declaration of gl_PerVertex.  If we're redeclaring
     * the named interface block gl_in, we can find it by looking at the
     * previous declaration of gl_in.  Otherwise we can find it by looking
     * at the previous decalartion of any of the built-in outputs,
     * e.g. gl_Position.
     *
     * Also check that the instance name and array-ness of the redeclaration
     * are correct.
     */
    switch (var_mode) {
    case ir_var_shader_in:
       if (ir_variable *earlier_gl_in =
           state->symbols->get_variable("gl_in")) {
          earlier_per_vertex = earlier_gl_in->get_interface_type();
       } else {
          _mesa_glsl_error(&loc, state,
                           "redeclaration of gl_PerVertex input not allowed "
                           "in the %s shader",
                           _mesa_shader_stage_to_string(state->stage));
       }
       if (this->instance_name == NULL__null ||
           strcmp(this->instance_name, "gl_in") != 0 || this->array_specifier == NULL__null ||
           !this->array_specifier->is_single_dimension()) {
          _mesa_glsl_error(&loc, state,
                           "gl_PerVertex input must be redeclared as "
                           "gl_in[]");
       }
       break;
    case ir_var_shader_out:
       if (ir_variable *earlier_gl_Position =
           state->symbols->get_variable("gl_Position")) {
          earlier_per_vertex = earlier_gl_Position->get_interface_type();
       } else if (ir_variable *earlier_gl_out =
             state->symbols->get_variable("gl_out")) {
          earlier_per_vertex = earlier_gl_out->get_interface_type();
       } else {
          _mesa_glsl_error(&loc, state,
                           "redeclaration of gl_PerVertex output not "
                           "allowed in the %s shader",
                           _mesa_shader_stage_to_string(state->stage));
       }
       if (state->stage == MESA_SHADER_TESS_CTRL) {
          if (this->instance_name == NULL__null ||
              strcmp(this->instance_name, "gl_out") != 0 || this->array_specifier == NULL__null) {
             _mesa_glsl_error(&loc, state,
                              "gl_PerVertex output must be redeclared as "
                              "gl_out[]");
          }
       } else {
          if (this->instance_name != NULL__null) {
             _mesa_glsl_error(&loc, state,
                              "gl_PerVertex output may not be redeclared with "
                              "an instance name");
          }
       }
       break;
    default:
       _mesa_glsl_error(&loc, state,
                        "gl_PerVertex must be declared as an input or an "
                        "output");
       break;
    }

    if (earlier_per_vertex == NULL__null) {
       /* An error has already been reported.  Bail out to avoid null
        * dereferences later in this function.
        */
       return NULL__null;
    }

    /* Copy locations from the old gl_PerVertex interface block. */
    for (unsigned i = 0; i < num_variables; i++) {
       int j = earlier_per_vertex->field_index(fields[i].name);
       if (j == -1) {
          _mesa_glsl_error(&loc, state,
                           "redeclaration of gl_PerVertex must be a subset "
                           "of the built-in members of gl_PerVertex");
       } else {
          fields[i].location =
             earlier_per_vertex->fields.structure[j].location;
          fields[i].offset =
             earlier_per_vertex->fields.structure[j].offset;
          fields[i].interpolation =
             earlier_per_vertex->fields.structure[j].interpolation;
          fields[i].centroid =
             earlier_per_vertex->fields.structure[j].centroid;
          fields[i].sample =
             earlier_per_vertex->fields.structure[j].sample;
          fields[i].patch =
             earlier_per_vertex->fields.structure[j].patch;
          fields[i].precision =
             earlier_per_vertex->fields.structure[j].precision;
          fields[i].explicit_xfb_buffer =
             earlier_per_vertex->fields.structure[j].explicit_xfb_buffer;
          fields[i].xfb_buffer =
             earlier_per_vertex->fields.structure[j].xfb_buffer;
          fields[i].xfb_stride =
             earlier_per_vertex->fields.structure[j].xfb_stride;
       }
    }

    /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
     * spec:
     *
     *     If a built-in interface block is redeclared, it must appear in
     *     the shader before any use of any member included in the built-in
     *     declaration, or a compilation error will result.
     *
     * This appears to be a clarification to the behaviour established for
     * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
     * regardless of GLSL version.
     */
    interface_block_usage_visitor v(var_mode, earlier_per_vertex);
    v.run(instructions);
    if (v.usage_found()) {
       _mesa_glsl_error(&loc, state,
                        "redeclaration of a built-in interface block must "
                        "appear before any use of any member of the "
                        "interface block");
    }
 }

 const glsl_type *block_type =
    glsl_type::get_interface_instance(fields,
                                      num_variables,
                                      packing,
                                      matrix_layout ==
                                         GLSL_MATRIX_LAYOUT_ROW_MAJOR,
                                      this->block_name);

 unsigned component_size = block_type->contains_double() ? 8 : 4;
 int xfb_offset =
    layout.flags.q.explicit_xfb_offset ? (int) qual_xfb_offset : -1;
 validate_xfb_offset_qualifier(&loc, state, xfb_offset, block_type,
                               component_size);

 if (!state->symbols->add_interface(block_type->name, block_type, var_mode)) {
    YYLTYPE loc = this->get_location();
    _mesa_glsl_error(&loc, state, "interface block `%s' with type `%s' "
                     "already taken in the current scope",
                     this->block_name, iface_type_name);
 }

 /* Since interface blocks cannot contain statements, it should be
  * impossible for the block to generate any instructions.
  */
 assert(declared_variables.is_empty())(static_cast <bool> (declared_variables.is_empty()) ? void
 (0) : __assert_fail ("declared_variables.is_empty()", __builtin_FILE
 (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__));

 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
  *
  *     Geometry shader input variables get the per-vertex values written
  *     out by vertex shader output variables of the same names. Since a
  *     geometry shader operates on a set of vertices, each input varying
  *     variable (or input block, see interface blocks below) needs to be
  *     declared as an array.
  */
 if (state->stage == MESA_SHADER_GEOMETRY && this->array_specifier == NULL__null &&
     var_mode == ir_var_shader_in) {
    _mesa_glsl_error(&loc, state, "geometry shader inputs must be arrays");
 } else if ((state->stage == MESA_SHADER_TESS_CTRL ||
             state->stage == MESA_SHADER_TESS_EVAL) &&
            !this->layout.flags.q.patch &&
            this->array_specifier == NULL__null &&
            var_mode == ir_var_shader_in) {
    _mesa_glsl_error(&loc, state, "per-vertex tessellation shader inputs must be arrays");
 } else if (state->stage == MESA_SHADER_TESS_CTRL &&
            !this->layout.flags.q.patch &&
            this->array_specifier == NULL__null &&
            var_mode == ir_var_shader_out) {
    _mesa_glsl_error(&loc, state, "tessellation control shader outputs must be arrays");
 }


 ir_typedecl_statement* stmt = new(state) ir_typedecl_statement(block_type);
 /* Push the interface declarations to the top.
  * However, do not insert declarations before default precision
  * statements or other declarations
  */
 ir_instruction* before_node = (ir_instruction*)instructions->get_head();
 while (before_node &&
        (before_node->ir_type == ir_type_precision ||
         before_node->ir_type == ir_type_typedecl))
    before_node = (ir_instruction*)before_node->next;
 if (before_node)
    before_node->insert_before(stmt);
 else
    instructions->push_head(stmt);

 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
  * says:
  *
  *     "If an instance name (instance-name) is used, then it puts all the
  *     members inside a scope within its own name space, accessed with the
  *     field selector ( . ) operator (analogously to structures)."
  */
 if (this->instance_name) {
    if (redeclaring_per_vertex) {
       /* When a built-in in an unnamed interface block is redeclared,
        * get_variable_being_redeclared() calls
        * check_builtin_array_max_size() to make sure that built-in array
        * variables aren't redeclared to illegal sizes.  But we're looking
        * at a redeclaration of a named built-in interface block.  So we
        * have to manually call check_builtin_array_max_size() for all parts
        * of the interface that are arrays.
        */
       for (unsigned i = 0; i < num_variables; i++) {
          if (fields[i].type->is_array()) {
             const unsigned size = fields[i].type->array_size();
             check_builtin_array_max_size(fields[i].name, size, loc, state);
          }
       }
    } else {
       validate_identifier(this->instance_name, loc, state);
    }

    ir_variable *var;

    if (this->array_specifier != NULL__null) {
       const glsl_type *block_array_type =
          process_array_type(&loc, block_type, this->array_specifier, state);

       /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
        *
        *     For uniform blocks declared an array, each individual array
        *     element corresponds to a separate buffer object backing one
        *     instance of the block. As the array size indicates the number
        *     of buffer objects needed, uniform block array declarations
        *     must specify an array size.
        *
        * And a few paragraphs later:
        *
        *     Geometry shader input blocks must be declared as arrays and
        *     follow the array declaration and linking rules for all
        *     geometry shader inputs. All other input and output block
        *     arrays must specify an array size.
        *
        * The same applies to tessellation shaders.
        *
        * The upshot of this is that the only circumstance where an
        * interface array size *doesn't* need to be specified is on a
        * geometry shader input, tessellation control shader input,
        * tessellation control shader output, and tessellation evaluation
        * shader input.
        */
       if (block_array_type->is_unsized_array()) {
          bool allow_inputs = state->stage == MESA_SHADER_GEOMETRY ||
                              state->stage == MESA_SHADER_TESS_CTRL ||
                              state->stage == MESA_SHADER_TESS_EVAL;
          bool allow_outputs = state->stage == MESA_SHADER_TESS_CTRL;

          if (this->layout.flags.q.in) {
             if (!allow_inputs)
                _mesa_glsl_error(&loc, state,
                                 "unsized input block arrays not allowed in "
                                 "%s shader",
                                 _mesa_shader_stage_to_string(state->stage));
          } else if (this->layout.flags.q.out) {
             if (!allow_outputs)
                _mesa_glsl_error(&loc, state,
                                 "unsized output block arrays not allowed in "
                                 "%s shader",
                                 _mesa_shader_stage_to_string(state->stage));
          } else {
             /* by elimination, this is a uniform block array */
             _mesa_glsl_error(&loc, state,
                              "unsized uniform block arrays not allowed in "
                              "%s shader",
                              _mesa_shader_stage_to_string(state->stage));
          }
       }

       /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
        *
        *     * Arrays of arrays of blocks are not allowed
        */
       if (state->es_shader && block_array_type->is_array() &&
           block_array_type->fields.array->is_array()) {
          _mesa_glsl_error(&loc, state,
                           "arrays of arrays interface blocks are "
                           "not allowed");
       }

       var = new(state) ir_variable(block_array_type,
                                    this->instance_name,
                                    var_mode);
    } else {
       var = new(state) ir_variable(block_type,
                                    this->instance_name,
                                    var_mode);
    }

    var->data.matrix_layout = matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED
       ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR : matrix_layout;

    if (var_mode == ir_var_shader_in || var_mode == ir_var_uniform)
       var->data.read_only = true;

    var->data.patch = this->layout.flags.q.patch;

    if (state->stage == MESA_SHADER_GEOMETRY && var_mode == ir_var_shader_in)
       handle_geometry_shader_input_decl(state, loc, var);
    else if ((state->stage == MESA_SHADER_TESS_CTRL ||
         state->stage == MESA_SHADER_TESS_EVAL) && var_mode == ir_var_shader_in)
       handle_tess_shader_input_decl(state, loc, var);
    else if (state->stage == MESA_SHADER_TESS_CTRL && var_mode == ir_var_shader_out)
       handle_tess_ctrl_shader_output_decl(state, loc, var);

    for (unsigned i = 0; i < num_variables; i++) {
       if (var->data.mode == ir_var_shader_storage)
          apply_memory_qualifiers(var, fields[i]);
    }

    if (ir_variable *earlier =
        state->symbols->get_variable(this->instance_name)) {
       if (!redeclaring_per_vertex) {
          _mesa_glsl_error(&loc, state, "`%s' redeclared",
                           this->instance_name);
       }
       earlier->data.how_declared = ir_var_declared_normally;
       earlier->type = var->type;
       earlier->reinit_interface_type(block_type);
       delete var;
    } else {
       if (this->layout.flags.q.explicit_binding) {
          apply_explicit_binding(state, &loc, var, var->type,
                                 &this->layout);
       }

       var->data.stream = qual_stream;
       if (layout.flags.q.explicit_location) {
          var->data.location = expl_location;
          var->data.explicit_location = true;
       }

       state->symbols->add_variable(var);
       instructions->push_tail(var);
    }
 } else {
    /* In order to have an array size, the block must also be declared with
     * an instance name.
     */
    assert(this->array_specifier == NULL)(static_cast <bool> (this->array_specifier == __null
) ? void (0) : __assert_fail ("this->array_specifier == NULL"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

    for (unsigned i = 0; i < num_variables; i++) {
       ir_variable *var =
          new(state) ir_variable(fields[i].type,
                                 ralloc_strdup(state, fields[i].name),
                                 var_mode);
       var->data.interpolation = fields[i].interpolation;
       var->data.centroid = fields[i].centroid;
       var->data.sample = fields[i].sample;
       var->data.patch = fields[i].patch;
       var->data.stream = qual_stream;
       var->data.location = fields[i].location;

       if (fields[i].location != -1)
          var->data.explicit_location = true;

       var->data.explicit_xfb_buffer = fields[i].explicit_xfb_buffer;
       var->data.xfb_buffer = fields[i].xfb_buffer;

       if (fields[i].offset != -1)
          var->data.explicit_xfb_offset = true;
       var->data.offset = fields[i].offset;

       var->init_interface_type(block_type);

       if (var_mode == ir_var_shader_in || var_mode == ir_var_uniform)
          var->data.read_only = true;

       /* Precision qualifiers do not have any meaning in Desktop GLSL */
       if (state->es_shader) {
          var->data.precision =
             select_gles_precision(fields[i].precision, fields[i].type,
                                   state, &loc);
       }

       if (fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED) {
          var->data.matrix_layout = matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED
             ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR : matrix_layout;
       } else {
          var->data.matrix_layout = fields[i].matrix_layout;
       }

       if (var->data.mode == ir_var_shader_storage)
          apply_memory_qualifiers(var, fields[i]);

       /* Examine var name here since var may get deleted in the next call */
       bool var_is_gl_id = is_gl_identifier(var->name);

       if (redeclaring_per_vertex) {
          bool is_redeclaration;
          var =
             get_variable_being_redeclared(&var, loc, state,
                                           true /* allow_all_redeclarations */,
                                           &is_redeclaration);
          if (!var_is_gl_id || !is_redeclaration) {
             _mesa_glsl_error(&loc, state,
                              "redeclaration of gl_PerVertex can only "
                              "include built-in variables");
          } else if (var->data.how_declared == ir_var_declared_normally) {
             _mesa_glsl_error(&loc, state,
                              "`%s' has already been redeclared",
                              var->name);
          } else {
             var->data.how_declared = ir_var_declared_in_block;
             var->reinit_interface_type(block_type);
          }
          continue;
       }

       if (state->symbols->get_variable(var->name) != NULL__null)
          _mesa_glsl_error(&loc, state, "`%s' redeclared", var->name);

       /* Propagate the "binding" keyword into this UBO/SSBO's fields.
        * The UBO declaration itself doesn't get an ir_variable unless it
        * has an instance name.  This is ugly.
        */
       if (this->layout.flags.q.explicit_binding) {
          apply_explicit_binding(state, &loc, var,
                                 var->get_interface_type(), &this->layout);
       }

       if (var->type->is_unsized_array()) {
          if (var->is_in_shader_storage_block() &&
              is_unsized_array_last_element(var)) {
             var->data.from_ssbo_unsized_array = true;
          } else {
             /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
              *
              * "If an array is declared as the last member of a shader storage
              * block and the size is not specified at compile-time, it is
              * sized at run-time. In all other cases, arrays are sized only
              * at compile-time."
              *
              * In desktop GLSL it is allowed to have unsized-arrays that are
              * not last, as long as we can determine that they are implicitly
              * sized.
              */
             if (state->es_shader) {
                _mesa_glsl_error(&loc, state, "unsized array `%s' "
                                 "definition: only last member of a shader "
                                 "storage block can be defined as unsized "
                                 "array", fields[i].name);
             }
          }
       }

       state->symbols->add_variable(var);
       instructions->push_tail(var);
    }

    if (redeclaring_per_vertex && block_type != earlier_per_vertex) {
       /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
        *
        *     It is also a compilation error ... to redeclare a built-in
        *     block and then use a member from that built-in block that was
        *     not included in the redeclaration.
        *
        * This appears to be a clarification to the behaviour established
        * for gl_PerVertex by GLSL 1.50, therefore we implement this
        * behaviour regardless of GLSL version.
        *
        * To prevent the shader from using a member that was not included in
        * the redeclaration, we disable any ir_variables that are still
        * associated with the old declaration of gl_PerVertex (since we've
        * already updated all of the variables contained in the new
        * gl_PerVertex to point to it).
        *
        * As a side effect this will prevent
        * validate_intrastage_interface_blocks() from getting confused and
        * thinking there are conflicting definitions of gl_PerVertex in the
        * shader.
        */
       foreach_in_list_safe(ir_instruction, node, instructions)for (ir_instruction *node = (!exec_node_is_tail_sentinel((instructions
)->head_sentinel.next) ? (ir_instruction *) ((instructions
)->head_sentinel.next) : __null), *__next = (node) ? (!exec_node_is_tail_sentinel
((instructions)->head_sentinel.next->next) ? (ir_instruction
 *) ((instructions)->head_sentinel.next->next) : __null
) : __null; (node) != __null; (node) = __next, __next = __next
 ? (!exec_node_is_tail_sentinel(__next->next) ? (ir_instruction
 *) (__next->next) : __null) : __null) {
          ir_variable *const var = node->as_variable();
          if (var != NULL__null &&
              var->get_interface_type() == earlier_per_vertex &&
              var->data.mode == var_mode) {
             if (var->data.how_declared == ir_var_declared_normally) {
                _mesa_glsl_error(&loc, state,
                                 "redeclaration of gl_PerVertex cannot "
                                 "follow a redeclaration of `%s'",
                                 var->name);
             }
             state->symbols->disable_variable(var->name);
             var->remove();
          }
       }
    }
 }

 return NULL__null;
8600}


8603ir_rvalue *
8604ast_tcs_output_layout::hir(exec_list *instructions,
                         struct _mesa_glsl_parse_state *state)
8606{
 YYLTYPE loc = this->get_location();

 unsigned num_vertices;
 if (!state->out_qualifier->vertices->
        process_qualifier_constant(state, "vertices", &num_vertices,
                                   false)) {
    /* return here to stop cascading incorrect error messages */
   return NULL__null;
 }

 /* If any shader outputs occurred before this declaration and specified an
  * array size, make sure the size they specified is consistent with the
  * primitive type.
  */
 if (state->tcs_output_size != 0 && state->tcs_output_size != num_vertices) {
    _mesa_glsl_error(&loc, state,
                     "this tessellation control shader output layout "
                     "specifies %u vertices, but a previous output "
                     "is declared with size %u",
                     num_vertices, state->tcs_output_size);
    return NULL__null;
 }

 state->tcs_output_vertices_specified = true;

 /* If any shader outputs occurred before this declaration and did not
  * specify an array size, their size is determined now.
  */
 foreach_in_list (ir_instruction, node, instructions)for (ir_instruction *node = (!exec_node_is_tail_sentinel((instructions
)->head_sentinel.next) ? (ir_instruction *) ((instructions
)->head_sentinel.next) : __null); (node) != __null; (node)
 = (!exec_node_is_tail_sentinel((node)->next) ? (ir_instruction
 *) ((node)->next) : __null)) {
    ir_variable *var = node->as_variable();
    if (var == NULL__null || var->data.mode != ir_var_shader_out)
       continue;

    /* Note: Not all tessellation control shader output are arrays. */
    if (!var->type->is_unsized_array() || var->data.patch)
       continue;

    if (var->data.max_array_access >= (int)num_vertices) {
       _mesa_glsl_error(&loc, state,
                        "this tessellation control shader output layout "
                        "specifies %u vertices, but an access to element "
                        "%u of output `%s' already exists", num_vertices,
                        var->data.max_array_access, var->name);
    } else {
       var->type = glsl_type::get_array_instance(var->type->fields.array,
                                                 num_vertices);
    }
 }

 return NULL__null;
8657}


8660ir_rvalue *
8661ast_gs_input_layout::hir(exec_list *instructions,
                       struct _mesa_glsl_parse_state *state)
8663{
 YYLTYPE loc = this->get_location();

 /* Should have been prevented by the parser. */
 assert(!state->gs_input_prim_type_specified(static_cast <bool> (!state->gs_input_prim_type_specified
 || state->in_qualifier->prim_type == this->prim_type
) ? void (0) : __assert_fail ("!state->gs_input_prim_type_specified || state->in_qualifier->prim_type == this->prim_type"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
))
        || state->in_qualifier->prim_type == this->prim_type)(static_cast <bool> (!state->gs_input_prim_type_specified
 || state->in_qualifier->prim_type == this->prim_type
) ? void (0) : __assert_fail ("!state->gs_input_prim_type_specified || state->in_qualifier->prim_type == this->prim_type"
, __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__
));

 /* If any shader inputs occurred before this declaration and specified an
  * array size, make sure the size they specified is consistent with the
  * primitive type.
  */
 unsigned num_vertices = vertices_per_prim(this->prim_type);
 if (state->gs_input_size != 0 && state->gs_input_size != num_vertices) {
    _mesa_glsl_error(&loc, state,
                     "this geometry shader input layout implies %u vertices"
                     " per primitive, but a previous input is declared"
                     " with size %u", num_vertices, state->gs_input_size);
    return NULL__null;
 }

 state->gs_input_prim_type_specified = true;

 /* If any shader inputs occurred before this declaration and did not
  * specify an array size, their size is determined now.
  */
 foreach_in_list(ir_instruction, node, instructions)for (ir_instruction *node = (!exec_node_is_tail_sentinel((instructions
)->head_sentinel.next) ? (ir_instruction *) ((instructions
)->head_sentinel.next) : __null); (node) != __null; (node)
 = (!exec_node_is_tail_sentinel((node)->next) ? (ir_instruction
 *) ((node)->next) : __null)) {
    ir_variable *var = node->as_variable();
    if (var == NULL__null || var->data.mode != ir_var_shader_in)
       continue;

    /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
     * array; skip it.
     */

    if (var->type->is_unsized_array()) {
       if (var->data.max_array_access >= (int)num_vertices) {
          _mesa_glsl_error(&loc, state,
                           "this geometry shader input layout implies %u"
                           " vertices, but an access to element %u of input"
                           " `%s' already exists", num_vertices,
                           var->data.max_array_access, var->name);
       } else {
          var->type = glsl_type::get_array_instance(var->type->fields.array,
                                                    num_vertices);
       }
    }
 }

 return NULL__null;
8712}


8715ir_rvalue *
8716ast_cs_input_layout::hir(exec_list *instructions,
                       struct _mesa_glsl_parse_state *state)
8718{
 YYLTYPE loc = this->get_location();

 /* From the ARB_compute_shader specification:
  *
  *     If the local size of the shader in any dimension is greater
  *     than the maximum size supported by the implementation for that
  *     dimension, a compile-time error results.
  *
  * It is not clear from the spec how the error should be reported if
  * the total size of the work group exceeds
  * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
  * report it at compile time as well.
  */
 GLuint64 total_invocations = 1;
 unsigned qual_local_size[3];
 for (int i = 0; i < 3; i++) {
1
Loop condition is true.  Entering loop body→

    char *local_size_str = ralloc_asprintf(NULL__null, "invalid local_size_%c",
                                           'x' + i);
    /* Infer a local_size of 1 for unspecified dimensions */
    if (this->local_size[i] == NULL__null) {
2
←
Assuming the condition is true→
3
←
Taking true branch→
       qual_local_size[i] = 1;
    } else if (!this->local_size[i]->
           process_qualifier_constant(state, local_size_str,
                                      &qual_local_size[i], false)) {
       ralloc_free(local_size_str);
       return NULL__null;
    }
    ralloc_free(local_size_str);

    if (qual_local_size[i] > state->ctx->Const.MaxComputeWorkGroupSize[i]) {
4
←
Assuming the condition is true→
5
←
Taking true branch→
       _mesa_glsl_error(&loc, state,
                        "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
                        " (%d)", 'x' + i,
                        state->ctx->Const.MaxComputeWorkGroupSize[i]);
       break;
    }
    total_invocations *= qual_local_size[i];
    if (total_invocations >
        state->ctx->Const.MaxComputeWorkGroupInvocations) {
       _mesa_glsl_error(&loc, state,
                        "product of local_sizes exceeds "
                        "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
                        state->ctx->Const.MaxComputeWorkGroupInvocations);
       break;
    }
 }

 /* If any compute input layout declaration preceded this one, make sure it
  * was consistent with this one.
  */
 if (state->cs_input_local_size_specified) {
6
←
 Execution continues on line 8770→
7
←
Assuming field 'cs_input_local_size_specified' is false→
8
←
Taking false branch→
    for (int i = 0; i < 3; i++) {
       if (state->cs_input_local_size[i] != qual_local_size[i]) {
          _mesa_glsl_error(&loc, state,
                           "compute shader input layout does not match"
                           " previous declaration");
          return NULL__null;
       }
    }
 }

 /* The ARB_compute_variable_group_size spec says:
  *
  *     If a compute shader including a *local_size_variable* qualifier also
  *     declares a fixed local group size using the *local_size_x*,
  *     *local_size_y*, or *local_size_z* qualifiers, a compile-time error
  *     results
  */
 if (state->cs_input_local_size_variable_specified) {
9
←
Assuming field 'cs_input_local_size_variable_specified' is false→
10
←
Taking false branch→
    _mesa_glsl_error(&loc, state,
                     "compute shader can't include both a variable and a "
                     "fixed local group size");
    return NULL__null;
 }

 state->cs_input_local_size_specified = true;
 for (int i = 0; i < 3; i++)
11
←
Loop condition is true.  Entering loop body→
12
←
The value 1 is assigned to 'i'→
13
←
Loop condition is true.  Entering loop body→
    state->cs_input_local_size[i] = qual_local_size[i];
14
←
Assigned value is uninitialized

 /* We may now declare the built-in constant gl_WorkGroupSize (see
  * builtin_variable_generator::generate_constants() for why we didn't
  * declare it earlier).
  */
 ir_variable *var = new(state->symbols)
    ir_variable(glsl_type::uvec3_type, "gl_WorkGroupSize", ir_var_auto);
 var->data.how_declared = ir_var_declared_implicitly;
 var->data.read_only = true;
 instructions->push_tail(var);
 state->symbols->add_variable(var);
 ir_constant_data data;
 memset(&data, 0, sizeof(data));
 for (int i = 0; i < 3; i++)
    data.u[i] = qual_local_size[i];
 var->constant_value = new(var) ir_constant(glsl_type::uvec3_type, &data);
 var->constant_initializer =
    new(var) ir_constant(glsl_type::uvec3_type, &data);
 var->data.has_initializer = true;

 return NULL__null;
8819}


8822static void
8823detect_conflicting_assignments(struct _mesa_glsl_parse_state *state,
                             exec_list *instructions)
8825{
 bool gl_FragColor_assigned = false;
 bool gl_FragData_assigned = false;
 bool gl_FragSecondaryColor_assigned = false;
 bool gl_FragSecondaryData_assigned = false;
 bool user_defined_fs_output_assigned = false;
 ir_variable *user_defined_fs_output = NULL__null;

 /* It would be nice to have proper location information. */
 YYLTYPE loc;
 memset(&loc, 0, sizeof(loc));

 foreach_in_list(ir_instruction, node, instructions)for (ir_instruction *node = (!exec_node_is_tail_sentinel((instructions
)->head_sentinel.next) ? (ir_instruction *) ((instructions
)->head_sentinel.next) : __null); (node) != __null; (node)
 = (!exec_node_is_tail_sentinel((node)->next) ? (ir_instruction
 *) ((node)->next) : __null)) {
    ir_variable *var = node->as_variable();

    if (!var || !var->data.assigned)
       continue;

    if (strcmp(var->name, "gl_FragColor") == 0)
       gl_FragColor_assigned = true;
    else if (strcmp(var->name, "gl_FragData") == 0)
       gl_FragData_assigned = true;
      else if (strcmp(var->name, "gl_SecondaryFragColorEXT") == 0)
       gl_FragSecondaryColor_assigned = true;
      else if (strcmp(var->name, "gl_SecondaryFragDataEXT") == 0)
       gl_FragSecondaryData_assigned = true;
    else if (!is_gl_identifier(var->name)) {
       if (state->stage == MESA_SHADER_FRAGMENT &&
           var->data.mode == ir_var_shader_out) {
          user_defined_fs_output_assigned = true;
          user_defined_fs_output = var;
       }
    }
 }

 /* From the GLSL 1.30 spec:
  *
  *     "If a shader statically assigns a value to gl_FragColor, it
  *      may not assign a value to any element of gl_FragData. If a
  *      shader statically writes a value to any element of
  *      gl_FragData, it may not assign a value to
  *      gl_FragColor. That is, a shader may assign values to either
  *      gl_FragColor or gl_FragData, but not both. Multiple shaders
  *      linked together must also consistently write just one of
  *      these variables.  Similarly, if user declared output
  *      variables are in use (statically assigned to), then the
  *      built-in variables gl_FragColor and gl_FragData may not be
  *      assigned to. These incorrect usages all generate compile
  *      time errors."
  */
 if (gl_FragColor_assigned && gl_FragData_assigned) {
    _mesa_glsl_error(&loc, state, "fragment shader writes to both "
                     "`gl_FragColor' and `gl_FragData'");
 } else if (gl_FragColor_assigned && user_defined_fs_output_assigned) {
    _mesa_glsl_error(&loc, state, "fragment shader writes to both "
                     "`gl_FragColor' and `%s'",
                     user_defined_fs_output->name);
 } else if (gl_FragSecondaryColor_assigned && gl_FragSecondaryData_assigned) {
    _mesa_glsl_error(&loc, state, "fragment shader writes to both "
                     "`gl_FragSecondaryColorEXT' and"
                     " `gl_FragSecondaryDataEXT'");
 } else if (gl_FragColor_assigned && gl_FragSecondaryData_assigned) {
    _mesa_glsl_error(&loc, state, "fragment shader writes to both "
                     "`gl_FragColor' and"
                     " `gl_FragSecondaryDataEXT'");
 } else if (gl_FragData_assigned && gl_FragSecondaryColor_assigned) {
    _mesa_glsl_error(&loc, state, "fragment shader writes to both "
                     "`gl_FragData' and"
                     " `gl_FragSecondaryColorEXT'");
 } else if (gl_FragData_assigned && user_defined_fs_output_assigned) {
    _mesa_glsl_error(&loc, state, "fragment shader writes to both "
                     "`gl_FragData' and `%s'",
                     user_defined_fs_output->name);
 }

 if ((gl_FragSecondaryColor_assigned || gl_FragSecondaryData_assigned) &&
     !state->EXT_blend_func_extended_enable) {
    _mesa_glsl_error(&loc, state,
                     "Dual source blending requires EXT_blend_func_extended");
 }
8905}

8907static void
8908verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state *state)
8909{
 YYLTYPE loc;
 memset(&loc, 0, sizeof(loc));

 /* Section 6.1.2 (Subroutines) of the GLSL 4.00 spec says:
  *
  *   "A program will fail to compile or link if any shader
  *    or stage contains two or more functions with the same
  *    name if the name is associated with a subroutine type."
  */

 for (int i = 0; i < state->num_subroutines; i++) {
    unsigned definitions = 0;
    ir_function *fn = state->subroutines[i];
    /* Calculate number of function definitions with the same name */
    foreach_in_list(ir_function_signature, sig, &fn->signatures)for (ir_function_signature *sig = (!exec_node_is_tail_sentinel
((&fn->signatures)->head_sentinel.next) ? (ir_function_signature
 *) ((&fn->signatures)->head_sentinel.next) : __null
); (sig) != __null; (sig) = (!exec_node_is_tail_sentinel((sig
)->next) ? (ir_function_signature *) ((sig)->next) : __null
)) {
       if (sig->is_defined) {
          if (++definitions > 1) {
             _mesa_glsl_error(&loc, state,
                   "%s shader contains two or more function "
                   "definitions with name `%s', which is "
                   "associated with a subroutine type.\n",
                   _mesa_shader_stage_to_string(state->stage),
                   fn->name);
             return;
          }
       }
    }
 }
8938}

8940static void
8941remove_per_vertex_blocks(exec_list *instructions,
                       _mesa_glsl_parse_state *state, ir_variable_mode mode)
8943{
 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
  * if it exists in this shader type.
  */
 const glsl_type *per_vertex = NULL__null;
 switch (mode) {
 case ir_var_shader_in:
    if (ir_variable *gl_in = state->symbols->get_variable("gl_in"))
       per_vertex = gl_in->get_interface_type();
    break;
 case ir_var_shader_out:
    if (ir_variable *gl_Position =
        state->symbols->get_variable("gl_Position")) {
       per_vertex = gl_Position->get_interface_type();
    }
    break;
 default:
    assert(!"Unexpected mode")(static_cast <bool> (!"Unexpected mode") ? void (0) : __assert_fail
 ("!\"Unexpected mode\"", __builtin_FILE (), __builtin_LINE (
), __extension__ __PRETTY_FUNCTION__));
    break;
 }

 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
  * need to do anything.
  */
 if (per_vertex == NULL__null)
    return;

 /* If the interface block is used by the shader, then we don't need to do
  * anything.
  */
 interface_block_usage_visitor v(mode, per_vertex);
 v.run(instructions);
 if (v.usage_found())
    return;

 /* Remove any ir_variable declarations that refer to the interface block
  * we're removing.
  */
 foreach_in_list_safe(ir_instruction, node, instructions)for (ir_instruction *node = (!exec_node_is_tail_sentinel((instructions
)->head_sentinel.next) ? (ir_instruction *) ((instructions
)->head_sentinel.next) : __null), *__next = (node) ? (!exec_node_is_tail_sentinel
((instructions)->head_sentinel.next->next) ? (ir_instruction
 *) ((instructions)->head_sentinel.next->next) : __null
) : __null; (node) != __null; (node) = __next, __next = __next
 ? (!exec_node_is_tail_sentinel(__next->next) ? (ir_instruction
 *) (__next->next) : __null) : __null) {
    ir_variable *const var = node->as_variable();
    if (var != NULL__null && var->get_interface_type() == per_vertex &&
        var->data.mode == mode) {
       state->symbols->disable_variable(var->name);
       var->remove();
    }
 }
8989}

8991ir_rvalue *
8992ast_warnings_toggle::hir(exec_list *,
                       struct _mesa_glsl_parse_state *state)
8994{
 state->warnings_enabled = enable;
 return NULL__null;
8997}