Bug Summary

File:root/firefox-clang/intl/icu/source/common/unifilt.cpp
Warning:line 53, column 18
Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c'

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name unifilt.cpp -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -ffp-contract=off -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/root/firefox-clang/obj-x86_64-pc-linux-gnu/config/external/icu/common -fcoverage-compilation-dir=/root/firefox-clang/obj-x86_64-pc-linux-gnu/config/external/icu/common -resource-dir /usr/lib/llvm-21/lib/clang/21 -include /root/firefox-clang/config/gcc_hidden.h -include /root/firefox-clang/obj-x86_64-pc-linux-gnu/mozilla-config.h -I /root/firefox-clang/obj-x86_64-pc-linux-gnu/dist/system_wrappers -U _FORTIFY_SOURCE -D _FORTIFY_SOURCE=2 -D _GLIBCXX_ASSERTIONS -D DEBUG=1 -D U_COMMON_IMPLEMENTATION -D _LIBCPP_DISABLE_DEPRECATION_WARNINGS -D U_USING_ICU_NAMESPACE=0 -D U_NO_DEFAULT_INCLUDE_UTF_HEADERS=1 -D U_HIDE_OBSOLETE_UTF_OLD_H=1 -D UCONFIG_NO_LEGACY_CONVERSION -D UCONFIG_NO_TRANSLITERATION -D UCONFIG_NO_REGULAR_EXPRESSIONS -D UCONFIG_NO_BREAK_ITERATION -D UCONFIG_NO_IDNA -D UCONFIG_NO_MF2 -D U_CHARSET_IS_UTF8 -D UNISTR_FROM_CHAR_EXPLICIT=explicit -D UNISTR_FROM_STRING_EXPLICIT=explicit -D U_ENABLE_DYLOAD=0 -D U_DEBUG=1 -I /root/firefox-clang/config/external/icu/common -I /root/firefox-clang/obj-x86_64-pc-linux-gnu/config/external/icu/common -I /root/firefox-clang/intl/icu/source/i18n -I /root/firefox-clang/obj-x86_64-pc-linux-gnu/dist/include -I /root/firefox-clang/obj-x86_64-pc-linux-gnu/dist/include/nspr -I /root/firefox-clang/obj-x86_64-pc-linux-gnu/dist/include/nss -D MOZILLA_CLIENT -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/x86_64-linux-gnu/c++/14 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/backward -internal-isystem /usr/lib/llvm-21/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-error=pessimizing-move -Wno-error=large-by-value-copy=128 -Wno-error=implicit-int-float-conversion -Wno-error=thread-safety-analysis -Wno-error=tautological-type-limit-compare -Wno-invalid-offsetof -Wno-range-loop-analysis -Wno-deprecated-anon-enum-enum-conversion -Wno-deprecated-enum-enum-conversion -Wno-deprecated-this-capture -Wno-inline-new-delete -Wno-error=deprecated-declarations -Wno-error=array-bounds -Wno-error=free-nonheap-object -Wno-error=atomic-alignment -Wno-error=deprecated-builtins -Wno-psabi -Wno-error=builtin-macro-redefined -Wno-vla-cxx-extension -Wno-unknown-warning-option -Wno-comma -Wno-implicit-const-int-float-conversion -Wno-macro-redefined -Wno-microsoft-include -Wno-tautological-unsigned-enum-zero-compare -Wno-unreachable-code-loop-increment -Wno-unreachable-code-return -fdeprecated-macro -ferror-limit 19 -fstrict-flex-arrays=1 -stack-protector 2 -fstack-clash-protection -ftrivial-auto-var-init=pattern -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fno-sized-deallocation -fno-aligned-allocation -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2025-06-27-100320-3286336-1 -x c++ /root/firefox-clang/intl/icu/source/common/unifilt.cpp
1// © 2016 and later: Unicode, Inc. and others.
2// License & terms of use: http://www.unicode.org/copyright.html
3/*
4**********************************************************************
5* Copyright (c) 2001-2012, International Business Machines
6* Corporation and others. All Rights Reserved.
7**********************************************************************
8* Date Name Description
9* 07/18/01 aliu Creation.
10**********************************************************************
11*/
12
13#include "unicode/unifilt.h"
14#include "unicode/rep.h"
15#include "unicode/utf16.h"
16
17U_NAMESPACE_BEGINnamespace icu_77 {
18UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter)UClassID UnicodeFilter::getStaticClassID() { static char classID
= 0; return (UClassID)&classID; }
19
20
21/* Define this here due to the lack of another file.
22 It can't be defined in the header */
23UnicodeMatcher::~UnicodeMatcher() {}
24
25UnicodeFilter::~UnicodeFilter() {}
26
27/**
28 * UnicodeFunctor API.
29 * Note that UnicodeMatcher is a base class of UnicodeFilter.
30 */
31UnicodeMatcher* UnicodeFilter::toMatcher() const {
32 return const_cast<UnicodeFilter *>(this);
33}
34
35void UnicodeFilter::setData(const TransliterationRuleData*) {}
36
37/**
38 * Default implementation of UnicodeMatcher::matches() for Unicode
39 * filters. Matches a single code point at offset (either one or
40 * two 16-bit code units).
41 */
42UMatchDegree UnicodeFilter::matches(const Replaceable& text,
43 int32_t& offset,
44 int32_t limit,
45 UBool incremental) {
46 UChar32 c;
47 if (offset < limit &&
48 contains(c = text.char32At(offset))) {
49 offset += U16_LENGTH(c)((uint32_t)(c)<=0xffff ? 1 : 2);
50 return U_MATCH;
51 }
52 if (offset > limit &&
53 contains(c = text.char32At(offset))) {
Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c'
54 // Backup offset by 1, unless the preceding character is a
55 // surrogate pair -- then backup by 2 (keep offset pointing at
56 // the lead surrogate).
57 --offset;
58 if (offset >= 0) {
59 offset -= U16_LENGTH(text.char32At(offset))((uint32_t)(text.char32At(offset))<=0xffff ? 1 : 2) - 1;
60 }
61 return U_MATCH;
62 }
63 if (incremental && offset == limit) {
64 return U_PARTIAL_MATCH;
65 }
66 return U_MISMATCH;
67}
68
69U_NAMESPACE_END}
70
71//eof