| File: | root/firefox-clang/memory/build/mozjemalloc.cpp |
| Warning: | line 2019, column 12 Value stored to 'now' during its initialization is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| 2 | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
| 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| 6 | |
| 7 | // Portions of this file were originally under the following license: |
| 8 | // |
| 9 | // Copyright (C) 2006-2008 Jason Evans <jasone@FreeBSD.org>. |
| 10 | // All rights reserved. |
| 11 | // Copyright (C) 2007-2017 Mozilla Foundation. |
| 12 | // |
| 13 | // Redistribution and use in source and binary forms, with or without |
| 14 | // modification, are permitted provided that the following conditions |
| 15 | // are met: |
| 16 | // 1. Redistributions of source code must retain the above copyright |
| 17 | // notice(s), this list of conditions and the following disclaimer as |
| 18 | // the first lines of this file unmodified other than the possible |
| 19 | // addition of one or more copyright notices. |
| 20 | // 2. Redistributions in binary form must reproduce the above copyright |
| 21 | // notice(s), this list of conditions and the following disclaimer in |
| 22 | // the documentation and/or other materials provided with the |
| 23 | // distribution. |
| 24 | // |
| 25 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY |
| 26 | // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 27 | // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 28 | // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE |
| 29 | // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 30 | // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 31 | // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 32 | // BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 33 | // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| 34 | // OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
| 35 | // EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 36 | // |
| 37 | // ***************************************************************************** |
| 38 | // |
| 39 | // This allocator implementation is designed to provide scalable performance |
| 40 | // for multi-threaded programs on multi-processor systems. The following |
| 41 | // features are included for this purpose: |
| 42 | // |
| 43 | // + Multiple arenas are used if there are multiple CPUs, which reduces lock |
| 44 | // contention and cache sloshing. |
| 45 | // |
| 46 | // + Cache line sharing between arenas is avoided for internal data |
| 47 | // structures. |
| 48 | // |
| 49 | // + Memory is managed in chunks and runs (chunks can be split into runs), |
| 50 | // rather than as individual pages. This provides a constant-time |
| 51 | // mechanism for associating allocations with particular arenas. |
| 52 | // |
| 53 | // Allocation requests are rounded up to the nearest size class, and no record |
| 54 | // of the original request size is maintained. Allocations are broken into |
| 55 | // categories according to size class. Assuming runtime defaults, the size |
| 56 | // classes in each category are as follows (for x86, x86_64 and Apple Silicon): |
| 57 | // |
| 58 | // |=========================================================| |
| 59 | // | Category | Subcategory | x86 | x86_64 | Mac ARM | |
| 60 | // |---------------------------+---------+---------+---------| |
| 61 | // | Word size | 32 bit | 64 bit | 64 bit | |
| 62 | // | Page size | 4 Kb | 4 Kb | 16 Kb | |
| 63 | // |=========================================================| |
| 64 | // | Small | Tiny | 4/-w | -w | - | |
| 65 | // | | | 8 | 8/-w | 8 | |
| 66 | // | |----------------+---------|---------|---------| |
| 67 | // | | Quantum-spaced | 16 | 16 | 16 | |
| 68 | // | | | 32 | 32 | 32 | |
| 69 | // | | | 48 | 48 | 48 | |
| 70 | // | | | ... | ... | ... | |
| 71 | // | | | 480 | 480 | 480 | |
| 72 | // | | | 496 | 496 | 496 | |
| 73 | // | |----------------+---------|---------|---------| |
| 74 | // | | Quantum-wide- | 512 | 512 | 512 | |
| 75 | // | | spaced | 768 | 768 | 768 | |
| 76 | // | | | ... | ... | ... | |
| 77 | // | | | 3584 | 3584 | 3584 | |
| 78 | // | | | 3840 | 3840 | 3840 | |
| 79 | // | |----------------+---------|---------|---------| |
| 80 | // | | Sub-page | - | - | 4096 | |
| 81 | // | | | - | - | 8 kB | |
| 82 | // |=========================================================| |
| 83 | // | Large | 4 kB | 4 kB | - | |
| 84 | // | | 8 kB | 8 kB | - | |
| 85 | // | | 12 kB | 12 kB | - | |
| 86 | // | | 16 kB | 16 kB | 16 kB | |
| 87 | // | | ... | ... | - | |
| 88 | // | | 32 kB | 32 kB | 32 kB | |
| 89 | // | | ... | ... | ... | |
| 90 | // | | 1008 kB | 1008 kB | 1008 kB | |
| 91 | // | | 1012 kB | 1012 kB | - | |
| 92 | // | | 1016 kB | 1016 kB | - | |
| 93 | // | | 1020 kB | 1020 kB | - | |
| 94 | // |=========================================================| |
| 95 | // | Huge | 1 MB | 1 MB | 1 MB | |
| 96 | // | | 2 MB | 2 MB | 2 MB | |
| 97 | // | | 3 MB | 3 MB | 3 MB | |
| 98 | // | | ... | ... | ... | |
| 99 | // |=========================================================| |
| 100 | // |
| 101 | // Legend: |
| 102 | // n: Size class exists for this platform. |
| 103 | // n/-w: This size class doesn't exist on Windows (see kMinTinyClass). |
| 104 | // -: This size class doesn't exist for this platform. |
| 105 | // ...: Size classes follow a pattern here. |
| 106 | // |
| 107 | // NOTE: Due to Mozilla bug 691003, we cannot reserve less than one word for an |
| 108 | // allocation on Linux or Mac. So on 32-bit *nix, the smallest bucket size is |
| 109 | // 4 bytes, and on 64-bit, the smallest bucket size is 8 bytes. |
| 110 | // |
| 111 | // A different mechanism is used for each category: |
| 112 | // |
| 113 | // Small : Each size class is segregated into its own set of runs. Each run |
| 114 | // maintains a bitmap of which regions are free/allocated. |
| 115 | // |
| 116 | // Large : Each allocation is backed by a dedicated run. Metadata are stored |
| 117 | // in the associated arena chunk header maps. |
| 118 | // |
| 119 | // Huge : Each allocation is backed by a dedicated contiguous set of chunks. |
| 120 | // Metadata are stored in a separate red-black tree. |
| 121 | // |
| 122 | // ***************************************************************************** |
| 123 | |
| 124 | #include "mozmemory_wrap.h" |
| 125 | #include "mozjemalloc.h" |
| 126 | #include "mozjemalloc_types.h" |
| 127 | #include "mozjemalloc_profiling.h" |
| 128 | |
| 129 | #include <cstring> |
| 130 | #include <cerrno> |
| 131 | #include <chrono> |
| 132 | #include <optional> |
| 133 | #include <type_traits> |
| 134 | #ifdef XP_WIN |
| 135 | # include <io.h> |
| 136 | # include <windows.h> |
| 137 | #else |
| 138 | # include <sys/mman.h> |
| 139 | # include <unistd.h> |
| 140 | #endif |
| 141 | #ifdef XP_DARWIN |
| 142 | # include <libkern/OSAtomic.h> |
| 143 | # include <mach/mach_init.h> |
| 144 | # include <mach/vm_map.h> |
| 145 | #endif |
| 146 | |
| 147 | #include "mozilla/Atomics.h" |
| 148 | #include "mozilla/Alignment.h" |
| 149 | #include "mozilla/ArrayUtils.h" |
| 150 | #include "mozilla/Assertions.h" |
| 151 | #include "mozilla/CheckedInt.h" |
| 152 | #include "mozilla/DebugOnly.h" |
| 153 | #include "mozilla/DoublyLinkedList.h" |
| 154 | #include "mozilla/HelperMacros.h" |
| 155 | #include "mozilla/Likely.h" |
| 156 | #include "mozilla/Literals.h" |
| 157 | #include "mozilla/MathAlgorithms.h" |
| 158 | #include "mozilla/RandomNum.h" |
| 159 | #include "mozilla/RefPtr.h" |
| 160 | // Note: MozTaggedAnonymousMmap() could call an LD_PRELOADed mmap |
| 161 | // instead of the one defined here; use only MozTagAnonymousMemory(). |
| 162 | #include "mozilla/TaggedAnonymousMemory.h" |
| 163 | #include "mozilla/ThreadLocal.h" |
| 164 | #include "mozilla/UniquePtr.h" |
| 165 | #include "mozilla/Unused.h" |
| 166 | #include "mozilla/XorShift128PlusRNG.h" |
| 167 | #include "mozilla/fallible.h" |
| 168 | #include "RadixTree.h" |
| 169 | #include "BaseAlloc.h" |
| 170 | #include "Chunk.h" |
| 171 | #include "Constants.h" |
| 172 | #include "Extent.h" |
| 173 | #include "Globals.h" |
| 174 | #include "Mutex.h" |
| 175 | #include "PHC.h" |
| 176 | #include "RedBlackTree.h" |
| 177 | #include "Utils.h" |
| 178 | #include "Zero.h" |
| 179 | |
| 180 | #if defined(XP_WIN) |
| 181 | # include "mozmemory_stall.h" |
| 182 | #endif |
| 183 | |
| 184 | using namespace mozilla; |
| 185 | |
| 186 | #ifdef MOZJEMALLOC_PROFILING_CALLBACKS1 |
| 187 | // MallocProfilerCallbacks is refcounted so that one thread cannot destroy it |
| 188 | // while another thread accesses it. This means that clearing this value or |
| 189 | // otherwise dropping a reference to it must not be done while holding an |
| 190 | // arena's lock. |
| 191 | MOZ_CONSTINIT[[clang::require_constant_initialization]] static RefPtr<MallocProfilerCallbacks> sCallbacks; |
| 192 | #endif |
| 193 | |
| 194 | // *************************************************************************** |
| 195 | // MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are mutually exclusive. |
| 196 | #if defined(MALLOC_DECOMMIT) && defined(MALLOC_DOUBLE_PURGE) |
| 197 | # error MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are mutually exclusive. |
| 198 | #endif |
| 199 | |
| 200 | // Set to true once the allocator has been initialized. |
| 201 | #if defined(_MSC_VER) && !defined(__clang__1) |
| 202 | // MSVC may create a static initializer for an Atomic<bool>, which may actually |
| 203 | // run after `malloc_init` has been called once, which triggers multiple |
| 204 | // initializations. |
| 205 | // We work around the problem by not using an Atomic<bool> at all. There is a |
| 206 | // theoretical problem with using `malloc_initialized` non-atomically, but |
| 207 | // practically, this is only true if `malloc_init` is never called before |
| 208 | // threads are created. |
| 209 | static bool malloc_initialized; |
| 210 | #else |
| 211 | // We can rely on Relaxed here because this variable is only ever set when |
| 212 | // holding gInitLock. A thread that still sees it false while another sets it |
| 213 | // true will enter the same lock, synchronize with the former and check the |
| 214 | // flag again under the lock. |
| 215 | static Atomic<bool, MemoryOrdering::Relaxed> malloc_initialized; |
| 216 | #endif |
| 217 | |
| 218 | // This lock must be held while bootstrapping us. |
| 219 | StaticMutex gInitLock MOZ_UNANNOTATED = {STATIC_MUTEX_INIT{ { 0, 0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, 0, 0, { 0, 0 } } }}; |
| 220 | |
| 221 | // *************************************************************************** |
| 222 | // Statistics data structures. |
| 223 | |
| 224 | struct arena_stats_t { |
| 225 | // Number of bytes currently mapped. |
| 226 | size_t mapped; |
| 227 | |
| 228 | // Current number of committed pages (non madvised/decommitted) |
| 229 | size_t committed; |
| 230 | |
| 231 | // Per-size-category statistics. |
| 232 | size_t allocated_small; |
| 233 | |
| 234 | size_t allocated_large; |
| 235 | |
| 236 | // The number of "memory operations" aka mallocs/frees. |
| 237 | uint64_t operations; |
| 238 | }; |
| 239 | |
| 240 | // Describe size classes to which allocations are rounded up to. |
| 241 | // TODO: add large and huge types when the arena allocation code |
| 242 | // changes in a way that allows it to be beneficial. |
| 243 | class SizeClass { |
| 244 | public: |
| 245 | enum ClassType { |
| 246 | Tiny, |
| 247 | Quantum, |
| 248 | QuantumWide, |
| 249 | SubPage, |
| 250 | Large, |
| 251 | }; |
| 252 | |
| 253 | explicit inline SizeClass(size_t aSize) { |
| 254 | if (aSize <= kMaxTinyClass) { |
| 255 | mType = Tiny; |
| 256 | mSize = std::max(RoundUpPow2(aSize), kMinTinyClass); |
| 257 | } else if (aSize <= kMaxQuantumClass) { |
| 258 | mType = Quantum; |
| 259 | mSize = QUANTUM_CEILING(aSize)(((aSize) + (kQuantumMask)) & ~(kQuantumMask)); |
| 260 | } else if (aSize <= kMaxQuantumWideClass) { |
| 261 | mType = QuantumWide; |
| 262 | mSize = QUANTUM_WIDE_CEILING(aSize)(((aSize) + (kQuantumWideMask)) & ~(kQuantumWideMask)); |
| 263 | } else if (aSize <= gMaxSubPageClass) { |
| 264 | mType = SubPage; |
| 265 | mSize = SUBPAGE_CEILING(aSize)(RoundUpPow2(aSize)); |
| 266 | } else if (aSize <= gMaxLargeClass) { |
| 267 | mType = Large; |
| 268 | mSize = PAGE_CEILING(aSize)(((aSize) + gPageSizeMask) & ~gPageSizeMask); |
| 269 | } else { |
| 270 | MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Invalid size")do { do { static_assert( mozilla::detail::AssertionConditionType <decltype(false)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(false))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("false" " (" "MOZ_ASSERT_UNREACHABLE: " "Invalid size" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 270); AnnotateMozCrashReason("MOZ_ASSERT" "(" "false" ") (" "MOZ_ASSERT_UNREACHABLE: " "Invalid size" ")"); do { MOZ_CrashSequence (__null, 270); __attribute__((nomerge)) ::abort(); } while (false ); } } while (false); __builtin_unreachable(); } while (false ); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | SizeClass& operator=(const SizeClass& aOther) = default; |
| 275 | |
| 276 | bool operator==(const SizeClass& aOther) { return aOther.mSize == mSize; } |
| 277 | |
| 278 | size_t Size() { return mSize; } |
| 279 | |
| 280 | ClassType Type() { return mType; } |
| 281 | |
| 282 | SizeClass Next() { return SizeClass(mSize + 1); } |
| 283 | |
| 284 | private: |
| 285 | ClassType mType; |
| 286 | size_t mSize; |
| 287 | }; |
| 288 | |
| 289 | // *************************************************************************** |
| 290 | // Arena data structures. |
| 291 | |
| 292 | struct arena_bin_t; |
| 293 | |
| 294 | struct ArenaChunkMapLink { |
| 295 | static RedBlackTreeNode<arena_chunk_map_t>& GetTreeNode( |
| 296 | arena_chunk_map_t* aThis) { |
| 297 | return aThis->link; |
| 298 | } |
| 299 | }; |
| 300 | |
| 301 | struct ArenaAvailTreeTrait : public ArenaChunkMapLink { |
| 302 | static inline Order Compare(arena_chunk_map_t* aNode, |
| 303 | arena_chunk_map_t* aOther) { |
| 304 | size_t size1 = aNode->bits & ~gPageSizeMask; |
| 305 | size_t size2 = aOther->bits & ~gPageSizeMask; |
| 306 | Order ret = CompareInt(size1, size2); |
| 307 | return (ret != Order::eEqual) |
| 308 | ? ret |
| 309 | : CompareAddr((aNode->bits & CHUNK_MAP_KEY((size_t)0x10U)) ? nullptr : aNode, |
| 310 | aOther); |
| 311 | } |
| 312 | }; |
| 313 | |
| 314 | struct ArenaDirtyChunkTrait { |
| 315 | static RedBlackTreeNode<arena_chunk_t>& GetTreeNode(arena_chunk_t* aThis) { |
| 316 | return aThis->link_dirty; |
| 317 | } |
| 318 | |
| 319 | static inline Order Compare(arena_chunk_t* aNode, arena_chunk_t* aOther) { |
| 320 | MOZ_ASSERT(aNode)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aNode)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(aNode))), 0))) { do { } while ( false); MOZ_ReportAssertionFailure("aNode", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 320); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aNode" ")"); do { MOZ_CrashSequence(__null, 320); __attribute__((nomerge) ) ::abort(); } while (false); } } while (false); |
| 321 | MOZ_ASSERT(aOther)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aOther)>::isValid, "invalid assertion condition") ; if ((__builtin_expect(!!(!(!!(aOther))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aOther", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 321); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aOther" ")") ; do { MOZ_CrashSequence(__null, 321); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 322 | return CompareAddr(aNode, aOther); |
| 323 | } |
| 324 | }; |
| 325 | |
| 326 | #ifdef MALLOC_DOUBLE_PURGE |
| 327 | namespace mozilla { |
| 328 | |
| 329 | template <> |
| 330 | struct GetDoublyLinkedListElement<arena_chunk_t> { |
| 331 | static DoublyLinkedListElement<arena_chunk_t>& Get(arena_chunk_t* aThis) { |
| 332 | return aThis->chunks_madvised_elem; |
| 333 | } |
| 334 | }; |
| 335 | } // namespace mozilla |
| 336 | #endif |
| 337 | |
| 338 | enum class purge_action_t { |
| 339 | None, |
| 340 | PurgeNow, |
| 341 | Queue, |
| 342 | }; |
| 343 | |
| 344 | struct arena_run_t { |
| 345 | #if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED1) |
| 346 | uint32_t mMagic; |
| 347 | # define ARENA_RUN_MAGIC0x384adf93 0x384adf93 |
| 348 | |
| 349 | // On 64-bit platforms, having the arena_bin_t pointer following |
| 350 | // the mMagic field means there's padding between both fields, making |
| 351 | // the run header larger than necessary. |
| 352 | // But when MOZ_DIAGNOSTIC_ASSERT_ENABLED is not set, starting the |
| 353 | // header with this field followed by the arena_bin_t pointer yields |
| 354 | // the same padding. We do want the mMagic field to appear first, so |
| 355 | // depending whether MOZ_DIAGNOSTIC_ASSERT_ENABLED is set or not, we |
| 356 | // move some field to avoid padding. |
| 357 | |
| 358 | // Number of free regions in run. |
| 359 | unsigned mNumFree; |
| 360 | #endif |
| 361 | |
| 362 | // Used by arena_bin_t::mNonFullRuns. |
| 363 | DoublyLinkedListElement<arena_run_t> mRunListElem; |
| 364 | |
| 365 | // Bin this run is associated with. |
| 366 | arena_bin_t* mBin; |
| 367 | |
| 368 | // Index of first element that might have a free region. |
| 369 | unsigned mRegionsMinElement; |
| 370 | |
| 371 | #if !defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED1) |
| 372 | // Number of free regions in run. |
| 373 | unsigned mNumFree; |
| 374 | #endif |
| 375 | |
| 376 | // Bitmask of in-use regions (0: in use, 1: free). |
| 377 | unsigned mRegionsMask[]; // Dynamically sized. |
| 378 | }; |
| 379 | |
| 380 | namespace mozilla { |
| 381 | |
| 382 | template <> |
| 383 | struct GetDoublyLinkedListElement<arena_run_t> { |
| 384 | static DoublyLinkedListElement<arena_run_t>& Get(arena_run_t* aThis) { |
| 385 | return aThis->mRunListElem; |
| 386 | } |
| 387 | }; |
| 388 | |
| 389 | } // namespace mozilla |
| 390 | |
| 391 | struct arena_bin_t { |
| 392 | // We use a LIFO ("last-in-first-out") policy to refill non-full runs. |
| 393 | // |
| 394 | // This has the following reasons: |
| 395 | // 1. It is cheap, as all our non-full-runs' book-keeping is O(1), no |
| 396 | // tree-balancing or walking is needed. |
| 397 | // 2. It also helps to increase the probability for CPU cache hits for the |
| 398 | // book-keeping and the reused slots themselves, as the same memory was |
| 399 | // most recently touched during free, especially when used from the same |
| 400 | // core (or via the same shared cache, depending on the architecture). |
| 401 | DoublyLinkedList<arena_run_t> mNonFullRuns; |
| 402 | |
| 403 | // Bin's size class. |
| 404 | size_t mSizeClass; |
| 405 | |
| 406 | // Total number of regions in a run for this bin's size class. |
| 407 | uint32_t mRunNumRegions; |
| 408 | |
| 409 | // Number of elements in a run's mRegionsMask for this bin's size class. |
| 410 | uint32_t mRunNumRegionsMask; |
| 411 | |
| 412 | // Offset of first region in a run for this bin's size class. |
| 413 | uint32_t mRunFirstRegionOffset; |
| 414 | |
| 415 | // Current number of runs in this bin, full or otherwise. |
| 416 | uint32_t mNumRuns; |
| 417 | |
| 418 | // A constant for fast division by size class. This value is 16 bits wide so |
| 419 | // it is placed last. |
| 420 | FastDivisor<uint16_t> mSizeDivisor; |
| 421 | |
| 422 | // Total number of pages in a run for this bin's size class. |
| 423 | uint8_t mRunSizePages; |
| 424 | |
| 425 | // Amount of overhead runs are allowed to have. |
| 426 | static constexpr double kRunOverhead = 1.6_percent; |
| 427 | static constexpr double kRunRelaxedOverhead = 2.4_percent; |
| 428 | |
| 429 | // Initialize a bin for the given size class. |
| 430 | // The generated run sizes, for a page size of 4 KiB, are: |
| 431 | // size|run size|run size|run size|run |
| 432 | // class|size class|size class|size class|size |
| 433 | // 4 4 KiB 8 4 KiB 16 4 KiB 32 4 KiB |
| 434 | // 48 4 KiB 64 4 KiB 80 4 KiB 96 4 KiB |
| 435 | // 112 4 KiB 128 8 KiB 144 4 KiB 160 8 KiB |
| 436 | // 176 4 KiB 192 4 KiB 208 8 KiB 224 4 KiB |
| 437 | // 240 8 KiB 256 16 KiB 272 8 KiB 288 4 KiB |
| 438 | // 304 12 KiB 320 12 KiB 336 4 KiB 352 8 KiB |
| 439 | // 368 4 KiB 384 8 KiB 400 20 KiB 416 16 KiB |
| 440 | // 432 12 KiB 448 4 KiB 464 16 KiB 480 8 KiB |
| 441 | // 496 20 KiB 512 32 KiB 768 16 KiB 1024 64 KiB |
| 442 | // 1280 24 KiB 1536 32 KiB 1792 16 KiB 2048 128 KiB |
| 443 | // 2304 16 KiB 2560 48 KiB 2816 36 KiB 3072 64 KiB |
| 444 | // 3328 36 KiB 3584 32 KiB 3840 64 KiB |
| 445 | inline void Init(SizeClass aSizeClass); |
| 446 | }; |
| 447 | |
| 448 | // We try to keep the above structure aligned with common cache lines sizes, |
| 449 | // often that's 64 bytes on x86 and ARM, we don't make assumptions for other |
| 450 | // architectures. |
| 451 | #if defined(__x86_64__1) || defined(__aarch64__) |
| 452 | // On 64bit platforms this structure is often 48 bytes |
| 453 | // long, which means every other array element will be properly aligned. |
| 454 | static_assert(sizeof(arena_bin_t) == 48); |
| 455 | #elif defined(__x86__) || defined(__arm__) |
| 456 | static_assert(sizeof(arena_bin_t) == 32); |
| 457 | #endif |
| 458 | |
| 459 | // We cannot instantiate |
| 460 | // Atomic<std::chrono::time_point<std::chrono::steady_clock>> |
| 461 | // so we explicitly force timestamps to be uint64_t in ns. |
| 462 | uint64_t GetTimestampNS() { |
| 463 | // On most if not all systems we care about the conversion to ns is a no-op, |
| 464 | // so we prefer to keep the precision here for performance, but let's be |
| 465 | // explicit about it. |
| 466 | return std::chrono::floor<std::chrono::nanoseconds>( |
| 467 | std::chrono::steady_clock::now()) |
| 468 | .time_since_epoch() |
| 469 | .count(); |
| 470 | } |
| 471 | |
| 472 | enum PurgeCondition { PurgeIfThreshold, PurgeUnconditional }; |
| 473 | |
| 474 | struct arena_t { |
| 475 | #if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED1) |
| 476 | uint32_t mMagic; |
| 477 | # define ARENA_MAGIC0x947d3d24 0x947d3d24 |
| 478 | #endif |
| 479 | |
| 480 | // Linkage for the tree of arenas by id. |
| 481 | // This just provides the memory to be used by the collection tree |
| 482 | // and thus needs no arena_t::mLock. |
| 483 | RedBlackTreeNode<arena_t> mLink; |
| 484 | |
| 485 | // Arena id, that we keep away from the beginning of the struct so that |
| 486 | // free list pointers in TypedBaseAlloc<arena_t> don't overflow in it, |
| 487 | // and it keeps the value it had after the destructor. |
| 488 | arena_id_t mId; |
| 489 | |
| 490 | // Operations on this arena require that lock be locked. The MaybeMutex |
| 491 | // class will elude locking if the arena is accessed from a single thread |
| 492 | // only (currently only the main thread can be used like this). |
| 493 | // Can be acquired while holding gArenas.mLock, but must not be acquired or |
| 494 | // held while holding or acquiring gArenas.mPurgeListLock. |
| 495 | MaybeMutex mLock MOZ_UNANNOTATED; |
| 496 | |
| 497 | // The lock is required to write to fields of mStats, but it is not needed to |
| 498 | // read them, so long as inconsistents reads are okay (fields might not make |
| 499 | // sense together). |
| 500 | arena_stats_t mStats MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 501 | |
| 502 | // We can read the allocated counts from mStats without a lock: |
| 503 | size_t AllocatedBytes() const MOZ_NO_THREAD_SAFETY_ANALYSIS__attribute__((no_thread_safety_analysis)) { |
| 504 | return mStats.allocated_small + mStats.allocated_large; |
| 505 | } |
| 506 | |
| 507 | // We can read the operations field from mStats without a lock: |
| 508 | uint64_t Operations() const MOZ_NO_THREAD_SAFETY_ANALYSIS__attribute__((no_thread_safety_analysis)) { |
| 509 | return mStats.operations; |
| 510 | } |
| 511 | |
| 512 | private: |
| 513 | // Tree of dirty-page-containing chunks this arena manages. |
| 514 | RedBlackTree<arena_chunk_t, ArenaDirtyChunkTrait> mChunksDirty |
| 515 | MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 516 | |
| 517 | #ifdef MALLOC_DOUBLE_PURGE |
| 518 | // Head of a linked list of MADV_FREE'd-page-containing chunks this |
| 519 | // arena manages. |
| 520 | DoublyLinkedList<arena_chunk_t> mChunksMAdvised MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 521 | #endif |
| 522 | |
| 523 | // In order to avoid rapid chunk allocation/deallocation when an arena |
| 524 | // oscillates right on the cusp of needing a new chunk, cache the most |
| 525 | // recently freed chunk. The spare is left in the arena's chunk trees |
| 526 | // until it is deleted. |
| 527 | // |
| 528 | // There is one spare chunk per arena, rather than one spare total, in |
| 529 | // order to avoid interactions between multiple threads that could make |
| 530 | // a single spare inadequate. |
| 531 | arena_chunk_t* mSpare MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 532 | |
| 533 | // A per-arena opt-in to randomize the offset of small allocations |
| 534 | // Needs no lock, read-only. |
| 535 | bool mRandomizeSmallAllocations; |
| 536 | |
| 537 | // A pseudorandom number generator. Initially null, it gets initialized |
| 538 | // on first use to avoid recursive malloc initialization (e.g. on OSX |
| 539 | // arc4random allocates memory). |
| 540 | mozilla::non_crypto::XorShift128PlusRNG* mPRNG MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 541 | bool mIsPRNGInitializing MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 542 | |
| 543 | public: |
| 544 | // Whether this is a private arena. Multiple public arenas are just a |
| 545 | // performance optimization and not a safety feature. |
| 546 | // |
| 547 | // Since, for example, we don't want thread-local arenas to grow too much, we |
| 548 | // use the default arena for bigger allocations. We use this member to allow |
| 549 | // realloc() to switch out of our arena if needed (which is not allowed for |
| 550 | // private arenas for security). |
| 551 | // Needs no lock, read-only. |
| 552 | bool mIsPrivate; |
| 553 | |
| 554 | // Current count of pages within unused runs that are potentially |
| 555 | // dirty, and for which madvise(... MADV_FREE) has not been called. By |
| 556 | // tracking this, we can institute a limit on how much dirty unused |
| 557 | // memory is mapped for each arena. |
| 558 | size_t mNumDirty MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 559 | |
| 560 | // Precalculated value for faster checks. |
| 561 | size_t mMaxDirty MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 562 | |
| 563 | // The current number of pages that are available without a system call (but |
| 564 | // probably a page fault). |
| 565 | size_t mNumMAdvised MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 566 | size_t mNumFresh MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 567 | |
| 568 | // Maximum value allowed for mNumDirty. |
| 569 | // Needs no lock, read-only. |
| 570 | size_t mMaxDirtyBase; |
| 571 | |
| 572 | // Needs no lock, read-only. |
| 573 | int32_t mMaxDirtyIncreaseOverride; |
| 574 | int32_t mMaxDirtyDecreaseOverride; |
| 575 | |
| 576 | // The link to gArenas.mOutstandingPurges. |
| 577 | // Note that this must only be accessed while holding gArenas.mPurgeListLock |
| 578 | // (but not arena_t.mLock !) through gArenas.mOutstandingPurges. |
| 579 | DoublyLinkedListElement<arena_t> mPurgeListElem; |
| 580 | |
| 581 | // A "significant reuse" is when a dirty page is used for a new allocation, |
| 582 | // it has the CHUNK_MAP_DIRTY bit cleared and CHUNK_MAP_ALLOCATED set. |
| 583 | // |
| 584 | // Timestamp of the last time we saw a significant reuse (in ns). |
| 585 | // Note that this variable is written very often from many threads and read |
| 586 | // only sparsely on the main thread, but when we read it we need to see the |
| 587 | // chronologically latest write asap (so we cannot use Relaxed). |
| 588 | Atomic<uint64_t> mLastSignificantReuseNS; |
| 589 | |
| 590 | public: |
| 591 | // A flag that indicates if arena will be Purge()'d. |
| 592 | // |
| 593 | // It is set either when a thread commits to adding it to mOutstandingPurges |
| 594 | // or when imitating a Purge. Cleared only by Purge when we know we are |
| 595 | // completely done. This is used to avoid accessing the list (and list lock) |
| 596 | // on every call to ShouldStartPurge() and to avoid deleting arenas that |
| 597 | // another thread is purging. |
| 598 | bool mIsPurgePending MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 599 | |
| 600 | // A mirror of ArenaCollection::mIsDeferredPurgeEnabled, here only to |
| 601 | // optimize memory reads in ShouldStartPurge(). |
| 602 | bool mIsDeferredPurgeEnabled MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 603 | |
| 604 | // True if the arena is in the process of being destroyed, and needs to be |
| 605 | // released after a concurrent purge completes. |
| 606 | bool mMustDeleteAfterPurge MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))) = false; |
| 607 | |
| 608 | // mLabel describes the label for the firefox profiler. It's stored in a |
| 609 | // fixed size area including a null terminating byte. The actual maximum |
| 610 | // length of the string is one less than LABEL_MAX_CAPACITY; |
| 611 | static constexpr size_t LABEL_MAX_CAPACITY = 128; |
| 612 | char mLabel[LABEL_MAX_CAPACITY]; |
| 613 | |
| 614 | private: |
| 615 | // Size/address-ordered tree of this arena's available runs. This tree |
| 616 | // is used for first-best-fit run allocation. |
| 617 | RedBlackTree<arena_chunk_map_t, ArenaAvailTreeTrait> mRunsAvail |
| 618 | MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 619 | |
| 620 | public: |
| 621 | // mBins is used to store rings of free regions of the following sizes, |
| 622 | // assuming a 16-byte quantum, 4kB pagesize, and default MALLOC_OPTIONS. |
| 623 | // |
| 624 | // | mBins[i] | size | |
| 625 | // +----------+------+ |
| 626 | // | 0 | 2 | |
| 627 | // | 1 | 4 | |
| 628 | // | 2 | 8 | |
| 629 | // +----------+------+ |
| 630 | // | 3 | 16 | |
| 631 | // | 4 | 32 | |
| 632 | // | 5 | 48 | |
| 633 | // | 6 | 64 | |
| 634 | // | : : |
| 635 | // | : : |
| 636 | // | 33 | 496 | |
| 637 | // | 34 | 512 | |
| 638 | // +----------+------+ |
| 639 | // | 35 | 768 | |
| 640 | // | 36 | 1024 | |
| 641 | // | : : |
| 642 | // | : : |
| 643 | // | 46 | 3584 | |
| 644 | // | 47 | 3840 | |
| 645 | // +----------+------+ |
| 646 | arena_bin_t mBins[] MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); // Dynamically sized. |
| 647 | |
| 648 | explicit arena_t(arena_params_t* aParams, bool aIsPrivate); |
| 649 | ~arena_t(); |
| 650 | |
| 651 | void ResetSmallAllocRandomization(); |
| 652 | |
| 653 | void InitPRNG() MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 654 | |
| 655 | private: |
| 656 | void InitChunk(arena_chunk_t* aChunk, size_t aMinCommittedPages) |
| 657 | MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 658 | |
| 659 | // Remove the chunk from the arena. This removes it from all the page counts. |
| 660 | // It assumes its run has already been removed and lets the caller clear |
| 661 | // mSpare as necessary. |
| 662 | bool RemoveChunk(arena_chunk_t* aChunk) MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 663 | |
| 664 | // This may return a chunk that should be destroyed with chunk_dealloc outside |
| 665 | // of the arena lock. It is not the same chunk as was passed in (since that |
| 666 | // chunk now becomes mSpare). |
| 667 | [[nodiscard]] arena_chunk_t* DemoteChunkToSpare(arena_chunk_t* aChunk) |
| 668 | MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 669 | |
| 670 | // Try to merge the run with its neighbours. Returns the new index of the run |
| 671 | // (since it may have merged with an earlier one). |
| 672 | size_t TryCoalesce(arena_chunk_t* aChunk, size_t run_ind, size_t run_pages, |
| 673 | size_t size) MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 674 | |
| 675 | arena_run_t* AllocRun(size_t aSize, bool aLarge, bool aZero) |
| 676 | MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 677 | |
| 678 | arena_chunk_t* DallocRun(arena_run_t* aRun, bool aDirty) MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 679 | |
| 680 | [[nodiscard]] bool SplitRun(arena_run_t* aRun, size_t aSize, bool aLarge, |
| 681 | bool aZero) MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 682 | |
| 683 | void TrimRunHead(arena_chunk_t* aChunk, arena_run_t* aRun, size_t aOldSize, |
| 684 | size_t aNewSize) MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 685 | |
| 686 | void TrimRunTail(arena_chunk_t* aChunk, arena_run_t* aRun, size_t aOldSize, |
| 687 | size_t aNewSize, bool dirty) MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 688 | |
| 689 | arena_run_t* GetNewEmptyBinRun(arena_bin_t* aBin) MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 690 | |
| 691 | inline arena_run_t* GetNonFullBinRun(arena_bin_t* aBin) MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 692 | |
| 693 | inline uint8_t FindFreeBitInMask(uint32_t aMask, uint32_t& aRng) |
| 694 | MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 695 | |
| 696 | inline void* ArenaRunRegAlloc(arena_run_t* aRun, arena_bin_t* aBin) |
| 697 | MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 698 | |
| 699 | inline void* MallocSmall(size_t aSize, bool aZero) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 700 | |
| 701 | void* MallocLarge(size_t aSize, bool aZero) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 702 | |
| 703 | void* MallocHuge(size_t aSize, bool aZero) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 704 | |
| 705 | void* PallocLarge(size_t aAlignment, size_t aSize, size_t aAllocSize) |
| 706 | MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 707 | |
| 708 | void* PallocHuge(size_t aSize, size_t aAlignment, bool aZero) |
| 709 | MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 710 | |
| 711 | void RallocShrinkLarge(arena_chunk_t* aChunk, void* aPtr, size_t aSize, |
| 712 | size_t aOldSize) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 713 | |
| 714 | bool RallocGrowLarge(arena_chunk_t* aChunk, void* aPtr, size_t aSize, |
| 715 | size_t aOldSize) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 716 | |
| 717 | void* RallocSmallOrLarge(void* aPtr, size_t aSize, size_t aOldSize) |
| 718 | MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 719 | |
| 720 | void* RallocHuge(void* aPtr, size_t aSize, size_t aOldSize) |
| 721 | MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 722 | |
| 723 | public: |
| 724 | inline void* Malloc(size_t aSize, bool aZero) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 725 | |
| 726 | void* Palloc(size_t aAlignment, size_t aSize) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 727 | |
| 728 | // This may return a chunk that should be destroyed with chunk_dealloc outside |
| 729 | // of the arena lock. It is not the same chunk as was passed in (since that |
| 730 | // chunk now becomes mSpare). |
| 731 | [[nodiscard]] inline arena_chunk_t* DallocSmall(arena_chunk_t* aChunk, |
| 732 | void* aPtr, |
| 733 | arena_chunk_map_t* aMapElm) |
| 734 | MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 735 | |
| 736 | [[nodiscard]] arena_chunk_t* DallocLarge(arena_chunk_t* aChunk, void* aPtr) |
| 737 | MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 738 | |
| 739 | void* Ralloc(void* aPtr, size_t aSize, size_t aOldSize) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 740 | |
| 741 | void UpdateMaxDirty() MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 742 | |
| 743 | #ifdef MALLOC_DECOMMIT |
| 744 | // During a commit operation (for aReqPages) we have the opportunity of |
| 745 | // commiting at most aRemPages additional pages. How many should we commit to |
| 746 | // amortise system calls? |
| 747 | size_t ExtraCommitPages(size_t aReqPages, size_t aRemainingPages) |
| 748 | MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 749 | #endif |
| 750 | |
| 751 | // Purge some dirty pages. |
| 752 | // |
| 753 | // When this is called the caller has already tested ShouldStartPurge() |
| 754 | // (possibly on another thread asychronously) or is passing |
| 755 | // PurgeUnconditional. However because it's called without the lock it will |
| 756 | // recheck ShouldContinuePurge() before doing any work. |
| 757 | // |
| 758 | // It may purge a number of runs within a single chunk before returning. It |
| 759 | // will return Continue if there's more work to do in other chunks |
| 760 | // (ShouldContinuePurge()). |
| 761 | // |
| 762 | // To release more pages from other chunks then it's best to call Purge |
| 763 | // in a loop, looping when it returns Continue. |
| 764 | // |
| 765 | // This must be called without the mLock held (it'll take the lock). |
| 766 | // |
| 767 | ArenaPurgeResult Purge(PurgeCondition aCond, PurgeStats& aStats) |
| 768 | MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 769 | |
| 770 | // Run Purge() in a loop. If sCallback is non-null then collect statistics and |
| 771 | // publish them through the callback, aCaller should be used to identify the |
| 772 | // caller in the profiling data. |
| 773 | // |
| 774 | // aCond - when to stop purging |
| 775 | // aCaller - a string representing the caller, this is used for |
| 776 | // profiling |
| 777 | // aReuseGraceMS - Stop purging the arena if it was used within this many |
| 778 | // milliseconds. Or 0 to ignore recent reuse. |
| 779 | // aKeepGoing - Optional function to implement a time budget. |
| 780 | // |
| 781 | ArenaPurgeResult PurgeLoop( |
| 782 | PurgeCondition aCond, const char* aCaller, uint32_t aReuseGraceMS = 0, |
| 783 | Maybe<std::function<bool()>> aKeepGoing = Nothing()) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 784 | |
| 785 | class PurgeInfo { |
| 786 | private: |
| 787 | size_t mDirtyInd = 0; |
| 788 | size_t mDirtyNPages = 0; |
| 789 | size_t mFreeRunInd = 0; |
| 790 | size_t mFreeRunLen = 0; |
| 791 | |
| 792 | public: |
| 793 | arena_t& mArena; |
| 794 | |
| 795 | arena_chunk_t* mChunk = nullptr; |
| 796 | |
| 797 | private: |
| 798 | PurgeStats& mPurgeStats; |
| 799 | |
| 800 | public: |
| 801 | size_t FreeRunLenBytes() const { return mFreeRunLen << gPageSize2Pow; } |
| 802 | |
| 803 | // The last index of the free run. |
| 804 | size_t FreeRunLastInd() const { return mFreeRunInd + mFreeRunLen - 1; } |
| 805 | |
| 806 | void* DirtyPtr() const { |
| 807 | return (void*)(uintptr_t(mChunk) + (mDirtyInd << gPageSize2Pow)); |
| 808 | } |
| 809 | |
| 810 | size_t DirtyLenBytes() const { return mDirtyNPages << gPageSize2Pow; } |
| 811 | |
| 812 | // Purging memory is seperated into 3 phases. |
| 813 | // * FindDirtyPages() which find the dirty pages in a chunk and marks the |
| 814 | // run and chunk as busy while holding the lock. |
| 815 | // * Release the pages (without the lock) |
| 816 | // * UpdatePagesAndCounts() which marks the dirty pages as not-dirty and |
| 817 | // updates other counters (while holding the lock). |
| 818 | // |
| 819 | // FindDirtyPages() will return false purging should not continue purging in |
| 820 | // this chunk. Either because it has no dirty pages or is dying. |
| 821 | bool FindDirtyPages(bool aPurgedOnce) MOZ_REQUIRES(mArena.mLock)__attribute__((exclusive_locks_required(mArena.mLock))); |
| 822 | |
| 823 | // Returns a pair, the first field indicates if there are more dirty pages |
| 824 | // remaining in the current chunk. The second field if non-null points to a |
| 825 | // chunk that must be released by the caller. |
| 826 | std::pair<bool, arena_chunk_t*> UpdatePagesAndCounts() |
| 827 | MOZ_REQUIRES(mArena.mLock)__attribute__((exclusive_locks_required(mArena.mLock))); |
| 828 | |
| 829 | // FinishPurgingInChunk() is used whenever we decide to stop purging in a |
| 830 | // chunk, This could be because there are no more dirty pages, or the chunk |
| 831 | // is dying, or we hit the arena-level threshold. |
| 832 | void FinishPurgingInChunk(bool aAddToMAdvised) MOZ_REQUIRES(mArena.mLock)__attribute__((exclusive_locks_required(mArena.mLock))); |
| 833 | |
| 834 | explicit PurgeInfo(arena_t& arena, arena_chunk_t* chunk, PurgeStats& stats) |
| 835 | : mArena(arena), mChunk(chunk), mPurgeStats(stats) {} |
| 836 | }; |
| 837 | |
| 838 | void HardPurge(); |
| 839 | |
| 840 | // Check mNumDirty against EffectiveMaxDirty and return the appropriate |
| 841 | // action to be taken by MayDoOrQueuePurge (outside mLock's scope). |
| 842 | // |
| 843 | // None: Nothing to do. |
| 844 | // PurgeNow: Immediate synchronous purge. |
| 845 | // Queue: Add a new purge request. |
| 846 | // |
| 847 | // Note that in the case of deferred purge this function takes into account |
| 848 | // mIsDeferredPurgeNeeded to avoid useless operations on the purge list |
| 849 | // that would require gArenas.mPurgeListLock. |
| 850 | inline purge_action_t ShouldStartPurge() MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 851 | |
| 852 | // Take action according to ShouldStartPurge. |
| 853 | inline void MayDoOrQueuePurge(purge_action_t aAction, const char* aCaller) |
| 854 | MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 855 | |
| 856 | // Check the EffectiveHalfMaxDirty threshold to decide if we continue purge. |
| 857 | // This threshold is lower than ShouldStartPurge to have some hysteresis. |
| 858 | bool ShouldContinuePurge(PurgeCondition aCond) MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))) { |
| 859 | return (mNumDirty > ((aCond == PurgeUnconditional) ? 0 : mMaxDirty >> 1)); |
| 860 | } |
| 861 | |
| 862 | // Update the last significant reuse timestamp. |
| 863 | void NotifySignificantReuse() MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 864 | |
| 865 | bool IsMainThreadOnly() const { return !mLock.LockIsEnabled(); } |
| 866 | |
| 867 | void* operator new(size_t aCount) = delete; |
| 868 | |
| 869 | void* operator new(size_t aCount, const fallible_t&) noexcept; |
| 870 | |
| 871 | void operator delete(void*); |
| 872 | }; |
| 873 | |
| 874 | namespace mozilla { |
| 875 | |
| 876 | template <> |
| 877 | struct GetDoublyLinkedListElement<arena_t> { |
| 878 | static DoublyLinkedListElement<arena_t>& Get(arena_t* aThis) { |
| 879 | return aThis->mPurgeListElem; |
| 880 | } |
| 881 | }; |
| 882 | |
| 883 | } // namespace mozilla |
| 884 | |
| 885 | struct ArenaTreeTrait { |
| 886 | static RedBlackTreeNode<arena_t>& GetTreeNode(arena_t* aThis) { |
| 887 | return aThis->mLink; |
| 888 | } |
| 889 | |
| 890 | static inline Order Compare(arena_t* aNode, arena_t* aOther) { |
| 891 | MOZ_ASSERT(aNode)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aNode)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(aNode))), 0))) { do { } while ( false); MOZ_ReportAssertionFailure("aNode", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 891); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aNode" ")"); do { MOZ_CrashSequence(__null, 891); __attribute__((nomerge) ) ::abort(); } while (false); } } while (false); |
| 892 | MOZ_ASSERT(aOther)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aOther)>::isValid, "invalid assertion condition") ; if ((__builtin_expect(!!(!(!!(aOther))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aOther", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 892); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aOther" ")") ; do { MOZ_CrashSequence(__null, 892); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 893 | return CompareInt(aNode->mId, aOther->mId); |
| 894 | } |
| 895 | }; |
| 896 | |
| 897 | // Bookkeeping for all the arenas used by the allocator. |
| 898 | // Arenas are separated in two categories: |
| 899 | // - "private" arenas, used through the moz_arena_* API |
| 900 | // - all the other arenas: the default arena, and thread-local arenas, |
| 901 | // used by the standard API. |
| 902 | class ArenaCollection { |
| 903 | public: |
| 904 | bool Init() MOZ_REQUIRES(gInitLock)__attribute__((exclusive_locks_required(gInitLock))) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))) { |
| 905 | MOZ_PUSH_IGNORE_THREAD_SAFETYGCC diagnostic push
GCC diagnostic ignored "-Wthread-safety" |
| 906 | mArenas.Init(); |
| 907 | mPrivateArenas.Init(); |
| 908 | #ifndef NON_RANDOM_ARENA_IDS1 |
| 909 | mMainThreadArenas.Init(); |
| 910 | #endif |
| 911 | MOZ_POP_THREAD_SAFETYGCC diagnostic pop |
| 912 | arena_params_t params; |
| 913 | // The main arena allows more dirty pages than the default for other arenas. |
| 914 | params.mMaxDirty = opt_dirty_max; |
| 915 | params.mLabel = "Default"; |
| 916 | mDefaultArena = |
| 917 | mLock.Init() ? CreateArena(/* aIsPrivate = */ false, ¶ms) : nullptr; |
| 918 | mPurgeListLock.Init(); |
| 919 | mIsDeferredPurgeEnabled = false; |
| 920 | return bool(mDefaultArena); |
| 921 | } |
| 922 | |
| 923 | // The requested arena must exist. |
| 924 | inline arena_t* GetById(arena_id_t aArenaId, bool aIsPrivate) |
| 925 | MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 926 | |
| 927 | arena_t* CreateArena(bool aIsPrivate, arena_params_t* aParams) |
| 928 | MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))); |
| 929 | |
| 930 | void DisposeArena(arena_t* aArena) MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))) { |
| 931 | // This will not call MayPurge but only unlink the element in case. |
| 932 | // It returns true if we successfully removed the item from the list, |
| 933 | // meaning we have exclusive access to it and can delete it. |
| 934 | bool delete_now = RemoveFromOutstandingPurges(aArena); |
| 935 | |
| 936 | { |
| 937 | MutexAutoLock lock(mLock); |
| 938 | Tree& tree = |
| 939 | #ifndef NON_RANDOM_ARENA_IDS1 |
| 940 | aArena->IsMainThreadOnly() ? mMainThreadArenas : |
| 941 | #endif |
| 942 | mPrivateArenas; |
| 943 | |
| 944 | MOZ_RELEASE_ASSERT(tree.Search(aArena), "Arena not in tree")do { static_assert( mozilla::detail::AssertionConditionType< decltype(tree.Search(aArena))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(tree.Search(aArena)))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("tree.Search(aArena)" " (" "Arena not in tree" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 944); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "tree.Search(aArena)" ") (" "Arena not in tree" ")"); do { MOZ_CrashSequence(__null , 944); __attribute__((nomerge)) ::abort(); } while (false); } } while (false); |
| 945 | tree.Remove(aArena); |
| 946 | mNumOperationsDisposedArenas += aArena->Operations(); |
| 947 | } |
| 948 | { |
| 949 | MutexAutoLock lock(aArena->mLock); |
| 950 | if (!aArena->mIsPurgePending) { |
| 951 | // If no purge was pending then we have exclusive access to the |
| 952 | // arena and must delete it. |
| 953 | delete_now = true; |
| 954 | } else if (!delete_now) { |
| 955 | // The remaining possibility, when we failed to remove the arena from |
| 956 | // the list (because a purging thread alredy did so) then that thread |
| 957 | // will be the last thread holding the arena and is now responsible for |
| 958 | // deleting it. |
| 959 | aArena->mMustDeleteAfterPurge = true; |
| 960 | |
| 961 | // Not that it's not possible to have checked the list of pending purges |
| 962 | // BEFORE the arena was added to the list because that would mean that |
| 963 | // an operation on the arena (free or realloc) was running concurrently |
| 964 | // with deletion, which would be a memory error and the assertions in |
| 965 | // the destructor help check for that. |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | if (delete_now) { |
| 970 | delete aArena; |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | void SetDefaultMaxDirtyPageModifier(int32_t aModifier) { |
| 975 | { |
| 976 | MutexAutoLock lock(mLock); |
| 977 | mDefaultMaxDirtyPageModifier = aModifier; |
| 978 | for (auto* arena : iter()) { |
| 979 | // We can only update max-dirty for main-thread-only arenas from the |
| 980 | // main thread. |
| 981 | if (!arena->IsMainThreadOnly() || IsOnMainThreadWeak()) { |
| 982 | arena->UpdateMaxDirty(); |
| 983 | } |
| 984 | } |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | int32_t DefaultMaxDirtyPageModifier() { return mDefaultMaxDirtyPageModifier; } |
| 989 | |
| 990 | using Tree = RedBlackTree<arena_t, ArenaTreeTrait>; |
| 991 | |
| 992 | struct Iterator : Tree::Iterator { |
| 993 | explicit Iterator(Tree* aTree, Tree* aSecondTree, |
| 994 | Tree* aThirdTree = nullptr) |
| 995 | : Tree::Iterator(aTree), |
| 996 | mSecondTree(aSecondTree), |
| 997 | mThirdTree(aThirdTree) {} |
| 998 | |
| 999 | Item<Iterator> begin() { |
| 1000 | return Item<Iterator>(this, *Tree::Iterator::begin()); |
| 1001 | } |
| 1002 | |
| 1003 | Item<Iterator> end() { return Item<Iterator>(this, nullptr); } |
| 1004 | |
| 1005 | arena_t* Next() { |
| 1006 | arena_t* result = Tree::Iterator::Next(); |
| 1007 | if (!result && mSecondTree) { |
| 1008 | new (this) Iterator(mSecondTree, mThirdTree); |
| 1009 | result = *Tree::Iterator::begin(); |
| 1010 | } |
| 1011 | return result; |
| 1012 | } |
| 1013 | |
| 1014 | private: |
| 1015 | Tree* mSecondTree; |
| 1016 | Tree* mThirdTree; |
| 1017 | }; |
| 1018 | |
| 1019 | Iterator iter() MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))) { |
| 1020 | #ifdef NON_RANDOM_ARENA_IDS1 |
| 1021 | return Iterator(&mArenas, &mPrivateArenas); |
| 1022 | #else |
| 1023 | return Iterator(&mArenas, &mPrivateArenas, &mMainThreadArenas); |
| 1024 | #endif |
| 1025 | } |
| 1026 | |
| 1027 | inline arena_t* GetDefault() { return mDefaultArena; } |
| 1028 | |
| 1029 | // Guards the collection of arenas. Must not be acquired while holding |
| 1030 | // a single arena's lock or mPurgeListLock. |
| 1031 | Mutex mLock MOZ_UNANNOTATED; |
| 1032 | |
| 1033 | // Guards only the list of outstanding purge requests. Can be acquired |
| 1034 | // while holding gArenas.mLock, but must not be acquired or held while |
| 1035 | // holding or acquiring a single arena's lock. |
| 1036 | Mutex mPurgeListLock; |
| 1037 | |
| 1038 | // We're running on the main thread which is set by a call to SetMainThread(). |
| 1039 | bool IsOnMainThread() const { |
| 1040 | return mMainThreadId.isSome() && |
| 1041 | ThreadIdEqual(mMainThreadId.value(), GetThreadId()); |
| 1042 | } |
| 1043 | |
| 1044 | // We're running on the main thread or SetMainThread() has never been called. |
| 1045 | bool IsOnMainThreadWeak() const { |
| 1046 | return mMainThreadId.isNothing() || IsOnMainThread(); |
| 1047 | } |
| 1048 | |
| 1049 | // After a fork set the new thread ID in the child. |
| 1050 | // This is done as the first thing after a fork, before mLock even re-inits. |
| 1051 | void ResetMainThread() MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))) { |
| 1052 | // The post fork handler in the child can run from a MacOS worker thread, |
| 1053 | // so we can't set our main thread to it here. Instead we have to clear it. |
| 1054 | mMainThreadId = Nothing(); |
| 1055 | } |
| 1056 | |
| 1057 | void SetMainThread() MOZ_EXCLUDES(mLock)__attribute__((locks_excluded(mLock))) { |
| 1058 | MutexAutoLock lock(mLock); |
| 1059 | MOZ_ASSERT(mMainThreadId.isNothing())do { static_assert( mozilla::detail::AssertionConditionType< decltype(mMainThreadId.isNothing())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mMainThreadId.isNothing()))) , 0))) { do { } while (false); MOZ_ReportAssertionFailure("mMainThreadId.isNothing()" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1059); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mMainThreadId.isNothing()" ")"); do { MOZ_CrashSequence (__null, 1059); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1060 | mMainThreadId = Some(GetThreadId()); |
| 1061 | } |
| 1062 | |
| 1063 | // This requires the lock to get a consistent count across all the active |
| 1064 | // + disposed arenas. |
| 1065 | uint64_t OperationsDisposedArenas() MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))) { |
| 1066 | return mNumOperationsDisposedArenas; |
| 1067 | } |
| 1068 | |
| 1069 | // Enable or disable the lazy purge. |
| 1070 | // |
| 1071 | // Returns the former state of enablement. |
| 1072 | // This is a global setting for all arenas. Changing it may cause an |
| 1073 | // immediate purge for all arenas. |
| 1074 | bool SetDeferredPurge(bool aEnable) { |
| 1075 | MOZ_ASSERT(IsOnMainThreadWeak())do { static_assert( mozilla::detail::AssertionConditionType< decltype(IsOnMainThreadWeak())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(IsOnMainThreadWeak()))), 0)) ) { do { } while (false); MOZ_ReportAssertionFailure("IsOnMainThreadWeak()" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1075); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "IsOnMainThreadWeak()" ")"); do { MOZ_CrashSequence (__null, 1075); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1076 | |
| 1077 | bool ret = mIsDeferredPurgeEnabled; |
| 1078 | { |
| 1079 | MutexAutoLock lock(mLock); |
| 1080 | mIsDeferredPurgeEnabled = aEnable; |
| 1081 | for (auto* arena : iter()) { |
| 1082 | MaybeMutexAutoLock lock(arena->mLock); |
| 1083 | arena->mIsDeferredPurgeEnabled = aEnable; |
| 1084 | } |
| 1085 | } |
| 1086 | if (ret != aEnable) { |
| 1087 | MayPurgeAll(PurgeIfThreshold, __func__); |
| 1088 | } |
| 1089 | return ret; |
| 1090 | } |
| 1091 | |
| 1092 | bool IsDeferredPurgeEnabled() { return mIsDeferredPurgeEnabled; } |
| 1093 | |
| 1094 | // Set aside a new purge request for aArena. |
| 1095 | void AddToOutstandingPurges(arena_t* aArena) MOZ_EXCLUDES(mPurgeListLock)__attribute__((locks_excluded(mPurgeListLock))); |
| 1096 | |
| 1097 | // Remove an unhandled purge request for aArena. Returns true if the arena |
| 1098 | // was in the list. |
| 1099 | bool RemoveFromOutstandingPurges(arena_t* aArena) |
| 1100 | MOZ_EXCLUDES(mPurgeListLock)__attribute__((locks_excluded(mPurgeListLock))); |
| 1101 | |
| 1102 | // Execute all outstanding purge requests, if any. |
| 1103 | void MayPurgeAll(PurgeCondition aCond, const char* aCaller); |
| 1104 | |
| 1105 | // Purge some dirty memory, based on purge requests, returns true if there are |
| 1106 | // more to process. |
| 1107 | // |
| 1108 | // Returns a may_purge_now_result_t with the following meaning: |
| 1109 | // Done: Purge has completed for all arenas. |
| 1110 | // NeedsMore: There may be some arenas that needs to be purged now. |
| 1111 | // WantsLater: There is at least one arena that might want a purge later, |
| 1112 | // according to aReuseGraceMS. |
| 1113 | // |
| 1114 | // Parameters: |
| 1115 | // aPeekOnly: If true, check only if there is work to do without doing it. |
| 1116 | // aReuseGraceMS: The time to wait with purge after a |
| 1117 | // significant re-use happened for an arena. |
| 1118 | // aKeepGoing: If this returns false purging will cease. |
| 1119 | // |
| 1120 | // This could exit for 3 different reasons. |
| 1121 | // - There are no more requests (it returns false) |
| 1122 | // - There are more requests but aKeepGoing() returned false. (returns true) |
| 1123 | // - One arena is completely purged, (returns true). |
| 1124 | // |
| 1125 | may_purge_now_result_t MayPurgeSteps( |
| 1126 | bool aPeekOnly, uint32_t aReuseGraceMS, |
| 1127 | const Maybe<std::function<bool()>>& aKeepGoing); |
| 1128 | |
| 1129 | private: |
| 1130 | const static arena_id_t MAIN_THREAD_ARENA_BIT = 0x1; |
| 1131 | |
| 1132 | #ifndef NON_RANDOM_ARENA_IDS1 |
| 1133 | // Can be called with or without lock, depending on aTree. |
| 1134 | inline arena_t* GetByIdInternal(Tree& aTree, arena_id_t aArenaId); |
| 1135 | |
| 1136 | arena_id_t MakeRandArenaId(bool aIsMainThreadOnly) const MOZ_REQUIRES(mLock)__attribute__((exclusive_locks_required(mLock))); |
| 1137 | #endif |
| 1138 | static bool ArenaIdIsMainThreadOnly(arena_id_t aArenaId) { |
| 1139 | return aArenaId & MAIN_THREAD_ARENA_BIT; |
| 1140 | } |
| 1141 | |
| 1142 | arena_t* mDefaultArena; |
| 1143 | arena_id_t mLastPublicArenaId MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 1144 | |
| 1145 | // Accessing mArenas and mPrivateArenas can only be done while holding mLock. |
| 1146 | Tree mArenas MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 1147 | Tree mPrivateArenas MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 1148 | |
| 1149 | #ifdef NON_RANDOM_ARENA_IDS1 |
| 1150 | // Arena ids are pseudo-obfuscated/deobfuscated based on these values randomly |
| 1151 | // initialized on first use. |
| 1152 | arena_id_t mArenaIdKey = 0; |
| 1153 | int8_t mArenaIdRotation = 0; |
| 1154 | #else |
| 1155 | // Some mMainThreadArenas accesses to mMainThreadArenas can (and should) elude |
| 1156 | // the lock, see GetById(). |
| 1157 | Tree mMainThreadArenas MOZ_GUARDED_BY(mLock)__attribute__((guarded_by(mLock))); |
| 1158 | #endif |
| 1159 | |
| 1160 | // Set only rarely and then propagated on the same thread to all arenas via |
| 1161 | // UpdateMaxDirty(). But also read in ExtraCommitPages on arbitrary threads. |
| 1162 | // TODO: Could ExtraCommitPages use arena_t::mMaxDirty instead ? |
| 1163 | Atomic<int32_t> mDefaultMaxDirtyPageModifier; |
| 1164 | // This is never changed except for forking, and it does not need mLock. |
| 1165 | Maybe<ThreadId> mMainThreadId; |
| 1166 | |
| 1167 | // The number of operations that happened in arenas that have since been |
| 1168 | // destroyed. |
| 1169 | uint64_t mNumOperationsDisposedArenas = 0; |
| 1170 | |
| 1171 | // Linked list of outstanding purges. This list has no particular order. |
| 1172 | // It is ok for an arena to be in this list even if mIsPurgePending is false, |
| 1173 | // it will just cause an extra round of a (most likely no-op) purge. |
| 1174 | // It is not ok to not be in this list but have mIsPurgePending set to true, |
| 1175 | // as this would prevent any future purges for this arena (except for during |
| 1176 | // MayPurgeStep or Purge). |
| 1177 | DoublyLinkedList<arena_t> mOutstandingPurges MOZ_GUARDED_BY(mPurgeListLock)__attribute__((guarded_by(mPurgeListLock))); |
| 1178 | // Flag if we should defer purge to later. Only ever set when holding the |
| 1179 | // collection lock. Read only during arena_t ctor. |
| 1180 | Atomic<bool> mIsDeferredPurgeEnabled; |
| 1181 | }; |
| 1182 | |
| 1183 | MOZ_RUNINIT static ArenaCollection gArenas; |
| 1184 | |
| 1185 | // Protects huge allocation-related data structures. |
| 1186 | static Mutex huge_mtx; |
| 1187 | |
| 1188 | // Tree of chunks that are stand-alone huge allocations. |
| 1189 | static RedBlackTree<extent_node_t, ExtentTreeTrait> huge |
| 1190 | MOZ_GUARDED_BY(huge_mtx)__attribute__((guarded_by(huge_mtx))); |
| 1191 | |
| 1192 | // Huge allocation statistics. |
| 1193 | static size_t huge_allocated MOZ_GUARDED_BY(huge_mtx)__attribute__((guarded_by(huge_mtx))); |
| 1194 | static size_t huge_mapped MOZ_GUARDED_BY(huge_mtx)__attribute__((guarded_by(huge_mtx))); |
| 1195 | static uint64_t huge_operations MOZ_GUARDED_BY(huge_mtx)__attribute__((guarded_by(huge_mtx))); |
| 1196 | |
| 1197 | // ****** |
| 1198 | // Arenas. |
| 1199 | |
| 1200 | // The arena associated with the current thread (per |
| 1201 | // jemalloc_thread_local_arena) On OSX, __thread/thread_local circles back |
| 1202 | // calling malloc to allocate storage on first access on each thread, which |
| 1203 | // leads to an infinite loop, but pthread-based TLS somehow doesn't have this |
| 1204 | // problem. |
| 1205 | #if !defined(XP_DARWIN) |
| 1206 | static MOZ_THREAD_LOCAL(arena_t*)__thread ::mozilla::detail::ThreadLocal< arena_t*, ::mozilla ::detail::ThreadLocalNativeStorage> thread_arena; |
| 1207 | #else |
| 1208 | static detail::ThreadLocal<arena_t*, detail::ThreadLocalKeyStorage> |
| 1209 | thread_arena; |
| 1210 | #endif |
| 1211 | |
| 1212 | // *************************************************************************** |
| 1213 | // Begin forward declarations. |
| 1214 | |
| 1215 | static void huge_dalloc(void* aPtr, arena_t* aArena); |
| 1216 | static bool malloc_init_hard(); |
| 1217 | |
| 1218 | #ifndef XP_WIN |
| 1219 | # ifdef XP_DARWIN |
| 1220 | # define FORK_HOOKstatic extern "C" |
| 1221 | # else |
| 1222 | # define FORK_HOOKstatic static |
| 1223 | # endif |
| 1224 | FORK_HOOKstatic void _malloc_prefork(void); |
| 1225 | FORK_HOOKstatic void _malloc_postfork_parent(void); |
| 1226 | FORK_HOOKstatic void _malloc_postfork_child(void); |
| 1227 | # ifdef XP_DARWIN |
| 1228 | FORK_HOOKstatic void _malloc_postfork(void); |
| 1229 | # endif |
| 1230 | #endif |
| 1231 | |
| 1232 | // End forward declarations. |
| 1233 | // *************************************************************************** |
| 1234 | |
| 1235 | // FreeBSD's pthreads implementation calls malloc(3), so the malloc |
| 1236 | // implementation has to take pains to avoid infinite recursion during |
| 1237 | // initialization. |
| 1238 | // Returns whether the allocator was successfully initialized. |
| 1239 | static inline bool malloc_init() { |
| 1240 | if (!malloc_initialized) { |
| 1241 | return malloc_init_hard(); |
| 1242 | } |
| 1243 | return true; |
| 1244 | } |
| 1245 | |
| 1246 | #ifdef ANDROID |
| 1247 | // Android's pthread.h does not declare pthread_atfork() until SDK 21. |
| 1248 | extern "C" MOZ_EXPORT__attribute__((visibility("default"))) int pthread_atfork(void (*)(void), void (*)(void), |
| 1249 | void (*)(void)); |
| 1250 | #endif |
| 1251 | |
| 1252 | // *************************************************************************** |
| 1253 | // Begin Utility functions/macros. |
| 1254 | |
| 1255 | #ifdef MOZJEMALLOC_PROFILING_CALLBACKS1 |
| 1256 | namespace mozilla { |
| 1257 | |
| 1258 | void jemalloc_set_profiler_callbacks( |
| 1259 | RefPtr<MallocProfilerCallbacks>&& aCallbacks) { |
| 1260 | sCallbacks = aCallbacks; |
| 1261 | } |
| 1262 | |
| 1263 | } // namespace mozilla |
| 1264 | #endif |
| 1265 | |
| 1266 | template <> |
| 1267 | arena_t* TypedBaseAlloc<arena_t>::sFirstFree = nullptr; |
| 1268 | |
| 1269 | template <> |
| 1270 | size_t TypedBaseAlloc<arena_t>::size_of() { |
| 1271 | // Allocate enough space for trailing bins. |
| 1272 | return sizeof(arena_t) + (sizeof(arena_bin_t) * NUM_SMALL_CLASSES(kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + gNumSubPageClasses)); |
| 1273 | } |
| 1274 | |
| 1275 | // End Utility functions/macros. |
| 1276 | // *************************************************************************** |
| 1277 | // Begin arena. |
| 1278 | |
| 1279 | static inline arena_t* thread_local_arena(bool enabled) { |
| 1280 | arena_t* arena; |
| 1281 | |
| 1282 | if (enabled) { |
| 1283 | // The arena will essentially be leaked if this function is |
| 1284 | // called with `false`, but it doesn't matter at the moment. |
| 1285 | // because in practice nothing actually calls this function |
| 1286 | // with `false`, except maybe at shutdown. |
| 1287 | arena_params_t params; |
| 1288 | params.mLabel = "Thread local"; |
| 1289 | arena = gArenas.CreateArena(/* aIsPrivate = */ false, ¶ms); |
| 1290 | } else { |
| 1291 | arena = gArenas.GetDefault(); |
| 1292 | } |
| 1293 | thread_arena.set(arena); |
| 1294 | return arena; |
| 1295 | } |
| 1296 | |
| 1297 | inline void MozJemalloc::jemalloc_thread_local_arena(bool aEnabled) { |
| 1298 | if (malloc_init()) { |
| 1299 | thread_local_arena(aEnabled); |
| 1300 | } |
| 1301 | } |
| 1302 | |
| 1303 | // Choose an arena based on a per-thread value. |
| 1304 | static inline arena_t* choose_arena(size_t size) { |
| 1305 | arena_t* ret = nullptr; |
| 1306 | |
| 1307 | // We can only use TLS if this is a PIC library, since for the static |
| 1308 | // library version, libc's malloc is used by TLS allocation, which |
| 1309 | // introduces a bootstrapping issue. |
| 1310 | |
| 1311 | if (size > kMaxQuantumClass) { |
| 1312 | // Force the default arena for larger allocations. |
| 1313 | ret = gArenas.GetDefault(); |
| 1314 | } else { |
| 1315 | // Check TLS to see if our thread has requested a pinned arena. |
| 1316 | ret = thread_arena.get(); |
| 1317 | // If ret is non-null, it must not be in the first page. |
| 1318 | MOZ_DIAGNOSTIC_ASSERT_IF(ret, (size_t)ret >= gPageSize)do { if (ret) { do { static_assert( mozilla::detail::AssertionConditionType <decltype((size_t)ret >= gPageSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((size_t)ret >= gPageSize) )), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(size_t)ret >= gPageSize" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1318); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "(size_t)ret >= gPageSize" ")" ); do { MOZ_CrashSequence(__null, 1318); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); } } while ( false); |
| 1319 | if (!ret) { |
| 1320 | // Nothing in TLS. Pin this thread to the default arena. |
| 1321 | ret = thread_local_arena(false); |
| 1322 | } |
| 1323 | } |
| 1324 | |
| 1325 | MOZ_DIAGNOSTIC_ASSERT(ret)do { static_assert( mozilla::detail::AssertionConditionType< decltype(ret)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(ret))), 0))) { do { } while (false ); MOZ_ReportAssertionFailure("ret", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1325); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "ret" ")"); do { MOZ_CrashSequence(__null, 1325); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1326 | return ret; |
| 1327 | } |
| 1328 | |
| 1329 | inline uint8_t arena_t::FindFreeBitInMask(uint32_t aMask, uint32_t& aRng) { |
| 1330 | if (mPRNG != nullptr) { |
| 1331 | if (aRng == UINT_MAX(2147483647 *2U +1U)) { |
| 1332 | aRng = mPRNG->next() % 32; |
| 1333 | } |
| 1334 | uint8_t bitIndex; |
| 1335 | // RotateRight asserts when provided bad input. |
| 1336 | aMask = aRng ? RotateRight(aMask, aRng) |
| 1337 | : aMask; // Rotate the mask a random number of slots |
| 1338 | bitIndex = CountTrailingZeroes32(aMask); |
| 1339 | return (bitIndex + aRng) % 32; |
| 1340 | } |
| 1341 | return CountTrailingZeroes32(aMask); |
| 1342 | } |
| 1343 | |
| 1344 | inline void* arena_t::ArenaRunRegAlloc(arena_run_t* aRun, arena_bin_t* aBin) { |
| 1345 | void* ret; |
| 1346 | unsigned i, mask, bit, regind; |
| 1347 | uint32_t rndPos = UINT_MAX(2147483647 *2U +1U); |
| 1348 | |
| 1349 | MOZ_DIAGNOSTIC_ASSERT(aRun->mMagic == ARENA_RUN_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aRun->mMagic == 0x384adf93)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aRun->mMagic == 0x384adf93 ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "aRun->mMagic == 0x384adf93", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1349); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "aRun->mMagic == 0x384adf93" ")"); do { MOZ_CrashSequence(__null, 1349); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1350 | MOZ_ASSERT(aRun->mRegionsMinElement < aBin->mRunNumRegionsMask)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aRun->mRegionsMinElement < aBin->mRunNumRegionsMask )>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(aRun->mRegionsMinElement < aBin->mRunNumRegionsMask ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "aRun->mRegionsMinElement < aBin->mRunNumRegionsMask" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1350); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aRun->mRegionsMinElement < aBin->mRunNumRegionsMask" ")"); do { MOZ_CrashSequence(__null, 1350); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1351 | |
| 1352 | // Move the first check outside the loop, so that aRun->mRegionsMinElement can |
| 1353 | // be updated unconditionally, without the possibility of updating it |
| 1354 | // multiple times. |
| 1355 | i = aRun->mRegionsMinElement; |
| 1356 | mask = aRun->mRegionsMask[i]; |
| 1357 | if (mask != 0) { |
| 1358 | bit = FindFreeBitInMask(mask, rndPos); |
| 1359 | |
| 1360 | regind = ((i << (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3)) + bit); |
| 1361 | MOZ_ASSERT(regind < aBin->mRunNumRegions)do { static_assert( mozilla::detail::AssertionConditionType< decltype(regind < aBin->mRunNumRegions)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(regind < aBin->mRunNumRegions ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "regind < aBin->mRunNumRegions", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1361); AnnotateMozCrashReason("MOZ_ASSERT" "(" "regind < aBin->mRunNumRegions" ")"); do { MOZ_CrashSequence(__null, 1361); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1362 | ret = (void*)(((uintptr_t)aRun) + aBin->mRunFirstRegionOffset + |
| 1363 | (aBin->mSizeClass * regind)); |
| 1364 | |
| 1365 | // Clear bit. |
| 1366 | mask ^= (1U << bit); |
| 1367 | aRun->mRegionsMask[i] = mask; |
| 1368 | |
| 1369 | return ret; |
| 1370 | } |
| 1371 | |
| 1372 | for (i++; i < aBin->mRunNumRegionsMask; i++) { |
| 1373 | mask = aRun->mRegionsMask[i]; |
| 1374 | if (mask != 0) { |
| 1375 | bit = FindFreeBitInMask(mask, rndPos); |
| 1376 | |
| 1377 | regind = ((i << (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3)) + bit); |
| 1378 | MOZ_ASSERT(regind < aBin->mRunNumRegions)do { static_assert( mozilla::detail::AssertionConditionType< decltype(regind < aBin->mRunNumRegions)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(regind < aBin->mRunNumRegions ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "regind < aBin->mRunNumRegions", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1378); AnnotateMozCrashReason("MOZ_ASSERT" "(" "regind < aBin->mRunNumRegions" ")"); do { MOZ_CrashSequence(__null, 1378); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1379 | ret = (void*)(((uintptr_t)aRun) + aBin->mRunFirstRegionOffset + |
| 1380 | (aBin->mSizeClass * regind)); |
| 1381 | |
| 1382 | // Clear bit. |
| 1383 | mask ^= (1U << bit); |
| 1384 | aRun->mRegionsMask[i] = mask; |
| 1385 | |
| 1386 | // Make a note that nothing before this element |
| 1387 | // contains a free region. |
| 1388 | aRun->mRegionsMinElement = i; // Low payoff: + (mask == 0); |
| 1389 | |
| 1390 | return ret; |
| 1391 | } |
| 1392 | } |
| 1393 | // Not reached. |
| 1394 | MOZ_DIAGNOSTIC_ASSERT(0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(0)>::isValid, "invalid assertion condition"); if ( (__builtin_expect(!!(!(!!(0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("0", "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1394 ); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "0" ")" ); do { MOZ_CrashSequence(__null, 1394); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1395 | return nullptr; |
| 1396 | } |
| 1397 | |
| 1398 | static inline void arena_run_reg_dalloc(arena_run_t* run, arena_bin_t* bin, |
| 1399 | void* ptr, size_t size) { |
| 1400 | uint32_t diff, regind; |
| 1401 | unsigned elm, bit; |
| 1402 | |
| 1403 | MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run->mMagic == 0x384adf93)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run->mMagic == 0x384adf93 ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "run->mMagic == 0x384adf93", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1403); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "run->mMagic == 0x384adf93" ")"); do { MOZ_CrashSequence(__null, 1403); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1404 | |
| 1405 | // Avoid doing division with a variable divisor if possible. Using |
| 1406 | // actual division here can reduce allocator throughput by over 20%! |
| 1407 | diff = |
| 1408 | (uint32_t)((uintptr_t)ptr - (uintptr_t)run - bin->mRunFirstRegionOffset); |
| 1409 | |
| 1410 | MOZ_ASSERT(diff <=do { static_assert( mozilla::detail::AssertionConditionType< decltype(diff <= (static_cast<unsigned>(bin->mRunSizePages ) << gPageSize2Pow))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(diff <= (static_cast<unsigned >(bin->mRunSizePages) << gPageSize2Pow)))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("diff <= (static_cast<unsigned>(bin->mRunSizePages) << gPageSize2Pow)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1411); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "diff <= (static_cast<unsigned>(bin->mRunSizePages) << gPageSize2Pow)" ")"); do { MOZ_CrashSequence(__null, 1411); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 1411 | (static_cast<unsigned>(bin->mRunSizePages) << gPageSize2Pow))do { static_assert( mozilla::detail::AssertionConditionType< decltype(diff <= (static_cast<unsigned>(bin->mRunSizePages ) << gPageSize2Pow))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(diff <= (static_cast<unsigned >(bin->mRunSizePages) << gPageSize2Pow)))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("diff <= (static_cast<unsigned>(bin->mRunSizePages) << gPageSize2Pow)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1411); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "diff <= (static_cast<unsigned>(bin->mRunSizePages) << gPageSize2Pow)" ")"); do { MOZ_CrashSequence(__null, 1411); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1412 | regind = diff / bin->mSizeDivisor; |
| 1413 | |
| 1414 | MOZ_DIAGNOSTIC_ASSERT(diff == regind * size)do { static_assert( mozilla::detail::AssertionConditionType< decltype(diff == regind * size)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(diff == regind * size))), 0) )) { do { } while (false); MOZ_ReportAssertionFailure("diff == regind * size" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1414); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "diff == regind * size" ")"); do { MOZ_CrashSequence(__null, 1414); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 1415 | MOZ_DIAGNOSTIC_ASSERT(regind < bin->mRunNumRegions)do { static_assert( mozilla::detail::AssertionConditionType< decltype(regind < bin->mRunNumRegions)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(regind < bin->mRunNumRegions ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "regind < bin->mRunNumRegions", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1415); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "regind < bin->mRunNumRegions" ")"); do { MOZ_CrashSequence(__null, 1415); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1416 | |
| 1417 | elm = regind >> (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3); |
| 1418 | if (elm < run->mRegionsMinElement) { |
| 1419 | run->mRegionsMinElement = elm; |
| 1420 | } |
| 1421 | bit = regind - (elm << (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3)); |
| 1422 | MOZ_RELEASE_ASSERT((run->mRegionsMask[elm] & (1U << bit)) == 0,do { static_assert( mozilla::detail::AssertionConditionType< decltype((run->mRegionsMask[elm] & (1U << bit)) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((run->mRegionsMask[elm] & (1U << bit)) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(run->mRegionsMask[elm] & (1U << bit)) == 0" " (" "Double-free?" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1423); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "(run->mRegionsMask[elm] & (1U << bit)) == 0" ") (" "Double-free?" ")"); do { MOZ_CrashSequence(__null, 1423 ); __attribute__((nomerge)) ::abort(); } while (false); } } while (false) |
| 1423 | "Double-free?")do { static_assert( mozilla::detail::AssertionConditionType< decltype((run->mRegionsMask[elm] & (1U << bit)) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((run->mRegionsMask[elm] & (1U << bit)) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(run->mRegionsMask[elm] & (1U << bit)) == 0" " (" "Double-free?" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1423); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "(run->mRegionsMask[elm] & (1U << bit)) == 0" ") (" "Double-free?" ")"); do { MOZ_CrashSequence(__null, 1423 ); __attribute__((nomerge)) ::abort(); } while (false); } } while (false); |
| 1424 | run->mRegionsMask[elm] |= (1U << bit); |
| 1425 | } |
| 1426 | |
| 1427 | bool arena_t::SplitRun(arena_run_t* aRun, size_t aSize, bool aLarge, |
| 1428 | bool aZero) { |
| 1429 | arena_chunk_t* chunk = GetChunkForPtr(aRun); |
| 1430 | size_t old_ndirty = chunk->ndirty; |
| 1431 | size_t run_ind = |
| 1432 | (unsigned)((uintptr_t(aRun) - uintptr_t(chunk)) >> gPageSize2Pow); |
| 1433 | size_t total_pages = |
| 1434 | (chunk->map[run_ind].bits & ~gPageSizeMask) >> gPageSize2Pow; |
| 1435 | size_t need_pages = (aSize >> gPageSize2Pow); |
| 1436 | MOZ_ASSERT(need_pages > 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(need_pages > 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(need_pages > 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("need_pages > 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1436); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "need_pages > 0" ")"); do { MOZ_CrashSequence (__null, 1436); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1437 | MOZ_ASSERT(need_pages <= total_pages)do { static_assert( mozilla::detail::AssertionConditionType< decltype(need_pages <= total_pages)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(need_pages <= total_pages ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "need_pages <= total_pages", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1437); AnnotateMozCrashReason("MOZ_ASSERT" "(" "need_pages <= total_pages" ")"); do { MOZ_CrashSequence(__null, 1437); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1438 | size_t rem_pages = total_pages - need_pages; |
| 1439 | |
| 1440 | MOZ_ASSERT((chunk->map[run_ind].bits & CHUNK_MAP_BUSY) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[run_ind].bits & ((size_t)0x100U)) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((chunk->map[run_ind].bits & ((size_t)0x100U)) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(chunk->map[run_ind].bits & ((size_t)0x100U)) == 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1440); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(chunk->map[run_ind].bits & ((size_t)0x100U)) == 0" ")"); do { MOZ_CrashSequence(__null, 1440); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1441 | |
| 1442 | #ifdef MALLOC_DECOMMIT |
| 1443 | size_t i = 0; |
| 1444 | while (i < need_pages) { |
| 1445 | MOZ_ASSERT((chunk->map[run_ind + i].bits & CHUNK_MAP_BUSY) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[run_ind + i].bits & ((size_t)0x100U )) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((chunk->map[run_ind + i].bits & ((size_t)0x100U )) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(chunk->map[run_ind + i].bits & ((size_t)0x100U)) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1445); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(chunk->map[run_ind + i].bits & ((size_t)0x100U)) == 0" ")"); do { MOZ_CrashSequence(__null, 1445); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1446 | |
| 1447 | // Commit decommitted pages if necessary. If a decommitted |
| 1448 | // page is encountered, commit all needed adjacent decommitted |
| 1449 | // pages in one operation, in order to reduce system call |
| 1450 | // overhead. |
| 1451 | if (chunk->map[run_ind + i].bits & CHUNK_MAP_DECOMMITTED((size_t)0x20U)) { |
| 1452 | // Advance i+j to just past the index of the last page |
| 1453 | // to commit. Clear CHUNK_MAP_DECOMMITTED along the way. |
| 1454 | size_t j; |
| 1455 | for (j = 0; i + j < need_pages && |
| 1456 | (chunk->map[run_ind + i + j].bits & CHUNK_MAP_DECOMMITTED((size_t)0x20U)); |
| 1457 | j++) { |
| 1458 | // DECOMMITTED, MADVISED and FRESH are mutually exclusive. |
| 1459 | MOZ_ASSERT((chunk->map[run_ind + i + j].bits &do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[run_ind + i + j].bits & (((size_t )0x80U) | ((size_t)0x40U))) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("(chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1460); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0" ")"); do { MOZ_CrashSequence(__null, 1460); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 1460 | (CHUNK_MAP_FRESH | CHUNK_MAP_MADVISED)) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[run_ind + i + j].bits & (((size_t )0x80U) | ((size_t)0x40U))) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("(chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1460); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0" ")"); do { MOZ_CrashSequence(__null, 1460); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1461 | } |
| 1462 | |
| 1463 | // Consider committing more pages to amortise calls to VirtualAlloc. |
| 1464 | // This only makes sense at the edge of our run hence the if condition |
| 1465 | // here. |
| 1466 | if (i + j == need_pages) { |
| 1467 | size_t extra_commit = ExtraCommitPages(j, rem_pages); |
| 1468 | for (; i + j < need_pages + extra_commit && |
| 1469 | (chunk->map[run_ind + i + j].bits & |
| 1470 | CHUNK_MAP_MADVISED_OR_DECOMMITTED(((size_t)0x40U) | ((size_t)0x20U))); |
| 1471 | j++) { |
| 1472 | MOZ_ASSERT((chunk->map[run_ind + i + j].bits &do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[run_ind + i + j].bits & (((size_t )0x80U) | ((size_t)0x40U))) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("(chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1473); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0" ")"); do { MOZ_CrashSequence(__null, 1473); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 1473 | (CHUNK_MAP_FRESH | CHUNK_MAP_MADVISED)) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[run_ind + i + j].bits & (((size_t )0x80U) | ((size_t)0x40U))) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("(chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1473); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(chunk->map[run_ind + i + j].bits & (((size_t)0x80U) | ((size_t)0x40U))) == 0" ")"); do { MOZ_CrashSequence(__null, 1473); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1474 | } |
| 1475 | } |
| 1476 | |
| 1477 | if (!pages_commit( |
| 1478 | (void*)(uintptr_t(chunk) + ((run_ind + i) << gPageSize2Pow)), |
| 1479 | j << gPageSize2Pow)) { |
| 1480 | return false; |
| 1481 | } |
| 1482 | |
| 1483 | // pages_commit zeroes pages, so mark them as such if it succeeded. |
| 1484 | // That's checked further below to avoid manually zeroing the pages. |
| 1485 | for (size_t k = 0; k < j; k++) { |
| 1486 | chunk->map[run_ind + i + k].bits = |
| 1487 | (chunk->map[run_ind + i + k].bits & ~CHUNK_MAP_DECOMMITTED((size_t)0x20U)) | |
| 1488 | CHUNK_MAP_ZEROED((size_t)0x04U) | CHUNK_MAP_FRESH((size_t)0x80U); |
| 1489 | } |
| 1490 | |
| 1491 | mNumFresh += j; |
| 1492 | i += j; |
| 1493 | } else { |
| 1494 | i++; |
| 1495 | } |
| 1496 | } |
| 1497 | #endif |
| 1498 | |
| 1499 | mRunsAvail.Remove(&chunk->map[run_ind]); |
| 1500 | |
| 1501 | // Keep track of trailing unused pages for later use. |
| 1502 | if (rem_pages > 0) { |
| 1503 | chunk->map[run_ind + need_pages].bits = |
| 1504 | (rem_pages << gPageSize2Pow) | |
| 1505 | (chunk->map[run_ind + need_pages].bits & gPageSizeMask); |
| 1506 | chunk->map[run_ind + total_pages - 1].bits = |
| 1507 | (rem_pages << gPageSize2Pow) | |
| 1508 | (chunk->map[run_ind + total_pages - 1].bits & gPageSizeMask); |
| 1509 | mRunsAvail.Insert(&chunk->map[run_ind + need_pages]); |
| 1510 | } |
| 1511 | |
| 1512 | for (size_t i = 0; i < need_pages; i++) { |
| 1513 | // Zero if necessary. |
| 1514 | if (aZero) { |
| 1515 | if ((chunk->map[run_ind + i].bits & CHUNK_MAP_ZEROED((size_t)0x04U)) == 0) { |
| 1516 | memset((void*)(uintptr_t(chunk) + ((run_ind + i) << gPageSize2Pow)), 0, |
| 1517 | gPageSize); |
| 1518 | // CHUNK_MAP_ZEROED is cleared below. |
| 1519 | } |
| 1520 | } |
| 1521 | |
| 1522 | // Update dirty page accounting. |
| 1523 | if (chunk->map[run_ind + i].bits & CHUNK_MAP_DIRTY((size_t)0x08U)) { |
| 1524 | chunk->ndirty--; |
| 1525 | mNumDirty--; |
| 1526 | // CHUNK_MAP_DIRTY is cleared below. |
| 1527 | } else if (chunk->map[run_ind + i].bits & CHUNK_MAP_MADVISED((size_t)0x40U)) { |
| 1528 | mStats.committed++; |
| 1529 | mNumMAdvised--; |
| 1530 | } |
| 1531 | |
| 1532 | if (chunk->map[run_ind + i].bits & CHUNK_MAP_FRESH((size_t)0x80U)) { |
| 1533 | mStats.committed++; |
| 1534 | mNumFresh--; |
| 1535 | } |
| 1536 | |
| 1537 | // This bit has already been cleared |
| 1538 | MOZ_ASSERT(!(chunk->map[run_ind + i].bits & CHUNK_MAP_DECOMMITTED))do { static_assert( mozilla::detail::AssertionConditionType< decltype(!(chunk->map[run_ind + i].bits & ((size_t)0x20U )))>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(!(chunk->map[run_ind + i].bits & ((size_t)0x20U ))))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("!(chunk->map[run_ind + i].bits & ((size_t)0x20U))", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1538); AnnotateMozCrashReason("MOZ_ASSERT" "(" "!(chunk->map[run_ind + i].bits & ((size_t)0x20U))" ")"); do { MOZ_CrashSequence(__null, 1538); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1539 | |
| 1540 | // Initialize the chunk map. This clears the dirty, zeroed and madvised |
| 1541 | // bits, decommitted is cleared above. |
| 1542 | if (aLarge) { |
| 1543 | chunk->map[run_ind + i].bits = CHUNK_MAP_LARGE((size_t)0x02U) | CHUNK_MAP_ALLOCATED((size_t)0x01U); |
| 1544 | } else { |
| 1545 | chunk->map[run_ind + i].bits = size_t(aRun) | CHUNK_MAP_ALLOCATED((size_t)0x01U); |
| 1546 | } |
| 1547 | } |
| 1548 | |
| 1549 | // Set the run size only in the first element for large runs. This is |
| 1550 | // primarily a debugging aid, since the lack of size info for trailing |
| 1551 | // pages only matters if the application tries to operate on an |
| 1552 | // interior pointer. |
| 1553 | if (aLarge) { |
| 1554 | chunk->map[run_ind].bits |= aSize; |
| 1555 | } |
| 1556 | |
| 1557 | if (chunk->ndirty == 0 && old_ndirty > 0 && !chunk->mIsPurging) { |
| 1558 | mChunksDirty.Remove(chunk); |
| 1559 | } |
| 1560 | return true; |
| 1561 | } |
| 1562 | |
| 1563 | void arena_t::InitChunk(arena_chunk_t* aChunk, size_t aMinCommittedPages) { |
| 1564 | mStats.mapped += kChunkSize; |
| 1565 | |
| 1566 | aChunk->arena = this; |
| 1567 | |
| 1568 | // Claim that no pages are in use, since the header is merely overhead. |
| 1569 | aChunk->ndirty = 0; |
| 1570 | |
| 1571 | aChunk->mIsPurging = false; |
| 1572 | aChunk->mDying = false; |
| 1573 | |
| 1574 | // Setup the chunk's pages in two phases. First we mark which pages are |
| 1575 | // committed & decommitted and perform the decommit. Then we update the map |
| 1576 | // to create the runs. |
| 1577 | |
| 1578 | // Clear the bits for the real header pages. |
| 1579 | size_t i; |
| 1580 | for (i = 0; i < gChunkHeaderNumPages - 1; i++) { |
| 1581 | aChunk->map[i].bits = 0; |
| 1582 | } |
| 1583 | mStats.committed += gChunkHeaderNumPages - 1; |
| 1584 | |
| 1585 | // Decommit the last header page (=leading page) as a guard. |
| 1586 | pages_decommit((void*)(uintptr_t(aChunk) + (i << gPageSize2Pow)), gPageSize); |
| 1587 | aChunk->map[i++].bits = CHUNK_MAP_DECOMMITTED((size_t)0x20U); |
| 1588 | |
| 1589 | // If MALLOC_DECOMMIT is enabled then commit only the pages we're about to |
| 1590 | // use. Otherwise commit all of them. |
| 1591 | #ifdef MALLOC_DECOMMIT |
| 1592 | size_t n_fresh_pages = |
| 1593 | aMinCommittedPages + |
| 1594 | ExtraCommitPages( |
| 1595 | aMinCommittedPages, |
| 1596 | gChunkNumPages - gChunkHeaderNumPages - aMinCommittedPages - 1); |
| 1597 | #else |
| 1598 | size_t n_fresh_pages = gChunkNumPages - 1 - gChunkHeaderNumPages; |
| 1599 | #endif |
| 1600 | |
| 1601 | // The committed pages are marked as Fresh. Our caller, SplitRun will update |
| 1602 | // this when it uses them. |
| 1603 | for (size_t j = 0; j < n_fresh_pages; j++) { |
| 1604 | aChunk->map[i + j].bits = CHUNK_MAP_ZEROED((size_t)0x04U) | CHUNK_MAP_FRESH((size_t)0x80U); |
| 1605 | } |
| 1606 | i += n_fresh_pages; |
| 1607 | mNumFresh += n_fresh_pages; |
| 1608 | |
| 1609 | #ifndef MALLOC_DECOMMIT |
| 1610 | // If MALLOC_DECOMMIT isn't defined then all the pages are fresh and setup in |
| 1611 | // the loop above. |
| 1612 | MOZ_ASSERT(i == gChunkNumPages - 1)do { static_assert( mozilla::detail::AssertionConditionType< decltype(i == gChunkNumPages - 1)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(i == gChunkNumPages - 1))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("i == gChunkNumPages - 1" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1612); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "i == gChunkNumPages - 1" ")"); do { MOZ_CrashSequence (__null, 1612); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1613 | #endif |
| 1614 | |
| 1615 | // If MALLOC_DECOMMIT is defined, then this will decommit the remainder of the |
| 1616 | // chunk plus the last page which is a guard page, if it is not defined it |
| 1617 | // will only decommit the guard page. |
| 1618 | pages_decommit((void*)(uintptr_t(aChunk) + (i << gPageSize2Pow)), |
| 1619 | (gChunkNumPages - i) << gPageSize2Pow); |
| 1620 | for (; i < gChunkNumPages; i++) { |
| 1621 | aChunk->map[i].bits = CHUNK_MAP_DECOMMITTED((size_t)0x20U); |
| 1622 | } |
| 1623 | |
| 1624 | // aMinCommittedPages will create a valid run. |
| 1625 | MOZ_ASSERT(aMinCommittedPages > 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aMinCommittedPages > 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aMinCommittedPages > 0))) , 0))) { do { } while (false); MOZ_ReportAssertionFailure("aMinCommittedPages > 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1625); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aMinCommittedPages > 0" ")"); do { MOZ_CrashSequence (__null, 1625); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1626 | MOZ_ASSERT(aMinCommittedPages <= gChunkNumPages - gChunkHeaderNumPages - 1)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aMinCommittedPages <= gChunkNumPages - gChunkHeaderNumPages - 1)>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(aMinCommittedPages <= gChunkNumPages - gChunkHeaderNumPages - 1))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("aMinCommittedPages <= gChunkNumPages - gChunkHeaderNumPages - 1" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1626); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aMinCommittedPages <= gChunkNumPages - gChunkHeaderNumPages - 1" ")"); do { MOZ_CrashSequence(__null, 1626); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1627 | |
| 1628 | // Create the run. |
| 1629 | aChunk->map[gChunkHeaderNumPages].bits |= gMaxLargeClass; |
| 1630 | aChunk->map[gChunkNumPages - 2].bits |= gMaxLargeClass; |
| 1631 | mRunsAvail.Insert(&aChunk->map[gChunkHeaderNumPages]); |
| 1632 | |
| 1633 | #ifdef MALLOC_DOUBLE_PURGE |
| 1634 | new (&aChunk->chunks_madvised_elem) DoublyLinkedListElement<arena_chunk_t>(); |
| 1635 | #endif |
| 1636 | } |
| 1637 | |
| 1638 | bool arena_t::RemoveChunk(arena_chunk_t* aChunk) { |
| 1639 | aChunk->mDying = true; |
| 1640 | |
| 1641 | // If the chunk has busy pages that means that a Purge() is in progress. |
| 1642 | // We can't remove the chunk now, instead Purge() will do it. |
| 1643 | if (aChunk->mIsPurging) { |
| 1644 | return false; |
| 1645 | } |
| 1646 | |
| 1647 | if (aChunk->ndirty > 0) { |
| 1648 | MOZ_ASSERT(aChunk->arena == this)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aChunk->arena == this)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aChunk->arena == this))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aChunk->arena == this" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1648); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aChunk->arena == this" ")"); do { MOZ_CrashSequence (__null, 1648); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1649 | mChunksDirty.Remove(aChunk); |
| 1650 | mNumDirty -= aChunk->ndirty; |
| 1651 | mStats.committed -= aChunk->ndirty; |
| 1652 | } |
| 1653 | |
| 1654 | // Count the number of madvised/fresh pages and update the stats. |
| 1655 | size_t madvised = 0; |
| 1656 | size_t fresh = 0; |
| 1657 | for (size_t i = gChunkHeaderNumPages; i < gChunkNumPages - 1; i++) { |
| 1658 | // There must not be any pages that are not fresh, madvised, decommitted |
| 1659 | // or dirty. |
| 1660 | MOZ_ASSERT(aChunk->map[i].bits &do { static_assert( mozilla::detail::AssertionConditionType< decltype(aChunk->map[i].bits & ((((size_t)0x80U) | ((size_t )0x40U) | ((size_t)0x20U)) | ((size_t)0x08U)))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aChunk->map[i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t )0x08U))))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("aChunk->map[i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1661); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aChunk->map[i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))" ")"); do { MOZ_CrashSequence(__null, 1661); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 1661 | (CHUNK_MAP_FRESH_MADVISED_OR_DECOMMITTED | CHUNK_MAP_DIRTY))do { static_assert( mozilla::detail::AssertionConditionType< decltype(aChunk->map[i].bits & ((((size_t)0x80U) | ((size_t )0x40U) | ((size_t)0x20U)) | ((size_t)0x08U)))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aChunk->map[i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t )0x08U))))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("aChunk->map[i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1661); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aChunk->map[i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))" ")"); do { MOZ_CrashSequence(__null, 1661); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1662 | MOZ_ASSERT((aChunk->map[i].bits & CHUNK_MAP_BUSY) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((aChunk->map[i].bits & ((size_t)0x100U)) == 0 )>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((aChunk->map[i].bits & ((size_t)0x100U)) == 0 ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "(aChunk->map[i].bits & ((size_t)0x100U)) == 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1662); AnnotateMozCrashReason("MOZ_ASSERT" "(" "(aChunk->map[i].bits & ((size_t)0x100U)) == 0" ")"); do { MOZ_CrashSequence(__null, 1662); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1663 | |
| 1664 | if (aChunk->map[i].bits & CHUNK_MAP_MADVISED((size_t)0x40U)) { |
| 1665 | madvised++; |
| 1666 | } else if (aChunk->map[i].bits & CHUNK_MAP_FRESH((size_t)0x80U)) { |
| 1667 | fresh++; |
| 1668 | } |
| 1669 | } |
| 1670 | |
| 1671 | mNumMAdvised -= madvised; |
| 1672 | mNumFresh -= fresh; |
| 1673 | |
| 1674 | #ifdef MALLOC_DOUBLE_PURGE |
| 1675 | if (mChunksMAdvised.ElementProbablyInList(aChunk)) { |
| 1676 | mChunksMAdvised.remove(aChunk); |
| 1677 | } |
| 1678 | #endif |
| 1679 | |
| 1680 | mStats.mapped -= kChunkSize; |
| 1681 | mStats.committed -= gChunkHeaderNumPages - 1; |
| 1682 | |
| 1683 | return true; |
| 1684 | } |
| 1685 | |
| 1686 | bool arena_chunk_t::IsEmpty() { |
| 1687 | return (map[gChunkHeaderNumPages].bits & |
| 1688 | (~gPageSizeMask | CHUNK_MAP_ALLOCATED((size_t)0x01U))) == gMaxLargeClass; |
| 1689 | } |
| 1690 | |
| 1691 | arena_chunk_t* arena_t::DemoteChunkToSpare(arena_chunk_t* aChunk) { |
| 1692 | if (mSpare) { |
| 1693 | if (!RemoveChunk(mSpare)) { |
| 1694 | // If we can't remove the spare chunk now purge will finish removing it |
| 1695 | // later. Set it to null so that the return below will return null and |
| 1696 | // our caller won't delete the chunk before Purge() is finished. |
| 1697 | mSpare = nullptr; |
| 1698 | } |
| 1699 | } |
| 1700 | |
| 1701 | arena_chunk_t* chunk_dealloc = mSpare; |
| 1702 | mSpare = aChunk; |
| 1703 | return chunk_dealloc; |
| 1704 | } |
| 1705 | |
| 1706 | arena_run_t* arena_t::AllocRun(size_t aSize, bool aLarge, bool aZero) { |
| 1707 | arena_run_t* run; |
| 1708 | arena_chunk_map_t* mapelm; |
| 1709 | arena_chunk_map_t key; |
| 1710 | |
| 1711 | MOZ_ASSERT(aSize <= gMaxLargeClass)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aSize <= gMaxLargeClass)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aSize <= gMaxLargeClass)) ), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aSize <= gMaxLargeClass" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1711); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aSize <= gMaxLargeClass" ")"); do { MOZ_CrashSequence (__null, 1711); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1712 | MOZ_ASSERT((aSize & gPageSizeMask) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((aSize & gPageSizeMask) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((aSize & gPageSizeMask) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(aSize & gPageSizeMask) == 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 1712); AnnotateMozCrashReason("MOZ_ASSERT" "(" "(aSize & gPageSizeMask) == 0" ")"); do { MOZ_CrashSequence(__null, 1712); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1713 | |
| 1714 | // Search the arena's chunks for the lowest best fit. |
| 1715 | key.bits = aSize | CHUNK_MAP_KEY((size_t)0x10U); |
| 1716 | mapelm = mRunsAvail.SearchOrNext(&key); |
| 1717 | if (mapelm) { |
| 1718 | arena_chunk_t* chunk = GetChunkForPtr(mapelm); |
| 1719 | size_t pageind = |
| 1720 | (uintptr_t(mapelm) - uintptr_t(chunk->map)) / sizeof(arena_chunk_map_t); |
| 1721 | |
| 1722 | MOZ_ASSERT((chunk->map[pageind].bits & CHUNK_MAP_BUSY) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[pageind].bits & ((size_t)0x100U)) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((chunk->map[pageind].bits & ((size_t)0x100U)) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(chunk->map[pageind].bits & ((size_t)0x100U)) == 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1722); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(chunk->map[pageind].bits & ((size_t)0x100U)) == 0" ")"); do { MOZ_CrashSequence(__null, 1722); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1723 | run = (arena_run_t*)(uintptr_t(chunk) + (pageind << gPageSize2Pow)); |
| 1724 | } else if (mSpare && !mSpare->mIsPurging) { |
| 1725 | // Use the spare. |
| 1726 | arena_chunk_t* chunk = mSpare; |
| 1727 | mSpare = nullptr; |
| 1728 | run = (arena_run_t*)(uintptr_t(chunk) + |
| 1729 | (gChunkHeaderNumPages << gPageSize2Pow)); |
| 1730 | // Insert the run into the tree of available runs. |
| 1731 | MOZ_ASSERT((chunk->map[gChunkHeaderNumPages].bits & CHUNK_MAP_BUSY) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[gChunkHeaderNumPages].bits & ((size_t )0x100U)) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!((chunk->map[gChunkHeaderNumPages ].bits & ((size_t)0x100U)) == 0))), 0))) { do { } while ( false); MOZ_ReportAssertionFailure("(chunk->map[gChunkHeaderNumPages].bits & ((size_t)0x100U)) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1731); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(chunk->map[gChunkHeaderNumPages].bits & ((size_t)0x100U)) == 0" ")"); do { MOZ_CrashSequence(__null, 1731); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 1732 | mRunsAvail.Insert(&chunk->map[gChunkHeaderNumPages]); |
| 1733 | } else { |
| 1734 | // No usable runs. Create a new chunk from which to allocate |
| 1735 | // the run. |
| 1736 | arena_chunk_t* chunk = |
| 1737 | (arena_chunk_t*)chunk_alloc(kChunkSize, kChunkSize, false); |
| 1738 | if (!chunk) { |
| 1739 | return nullptr; |
| 1740 | } |
| 1741 | |
| 1742 | InitChunk(chunk, aSize >> gPageSize2Pow); |
| 1743 | run = (arena_run_t*)(uintptr_t(chunk) + |
| 1744 | (gChunkHeaderNumPages << gPageSize2Pow)); |
| 1745 | } |
| 1746 | // Update page map. |
| 1747 | return SplitRun(run, aSize, aLarge, aZero) ? run : nullptr; |
| 1748 | } |
| 1749 | |
| 1750 | void arena_t::UpdateMaxDirty() { |
| 1751 | MaybeMutexAutoLock lock(mLock); |
| 1752 | int32_t modifier = gArenas.DefaultMaxDirtyPageModifier(); |
| 1753 | if (modifier) { |
| 1754 | int32_t arenaOverride = |
| 1755 | modifier > 0 ? mMaxDirtyIncreaseOverride : mMaxDirtyDecreaseOverride; |
| 1756 | if (arenaOverride) { |
| 1757 | modifier = arenaOverride; |
| 1758 | } |
| 1759 | } |
| 1760 | |
| 1761 | mMaxDirty = |
| 1762 | modifier >= 0 ? mMaxDirtyBase << modifier : mMaxDirtyBase >> -modifier; |
| 1763 | } |
| 1764 | |
| 1765 | #ifdef MALLOC_DECOMMIT |
| 1766 | |
| 1767 | size_t arena_t::ExtraCommitPages(size_t aReqPages, size_t aRemainingPages) { |
| 1768 | const int32_t modifier = gArenas.DefaultMaxDirtyPageModifier(); |
| 1769 | if (modifier < 0) { |
| 1770 | return 0; |
| 1771 | } |
| 1772 | |
| 1773 | // The maximum size of the page cache |
| 1774 | const size_t max_page_cache = mMaxDirty; |
| 1775 | |
| 1776 | // The current size of the page cache, note that we use mNumFresh + |
| 1777 | // mNumMAdvised here but Purge() does not. |
| 1778 | const size_t page_cache = mNumDirty + mNumFresh + mNumMAdvised; |
| 1779 | |
| 1780 | if (page_cache > max_page_cache) { |
| 1781 | // We're already exceeding our dirty page count even though we're trying |
| 1782 | // to allocate. This can happen due to fragmentation. Don't commit |
| 1783 | // excess memory since we're probably here due to a larger allocation and |
| 1784 | // small amounts of memory are certainly available in the page cache. |
| 1785 | return 0; |
| 1786 | } |
| 1787 | if (modifier > 0) { |
| 1788 | // If modifier is > 0 then we want to keep all the pages we can, but don't |
| 1789 | // exceed the size of the page cache. The subtraction cannot underflow |
| 1790 | // because of the condition above. |
| 1791 | return std::min(aRemainingPages, max_page_cache - page_cache); |
| 1792 | } |
| 1793 | |
| 1794 | // The rest is arbitrary and involves a some assumptions. I've broken it down |
| 1795 | // into simple expressions to document them more clearly. |
| 1796 | |
| 1797 | // Assumption 1: a quarter of mMaxDirty is a sensible "minimum |
| 1798 | // target" for the dirty page cache. Likewise 3 quarters is a sensible |
| 1799 | // "maximum target". Note that for the maximum we avoid using the whole page |
| 1800 | // cache now so that a free that follows this allocation doesn't immeidatly |
| 1801 | // call Purge (churning memory). |
| 1802 | const size_t min = max_page_cache / 4; |
| 1803 | const size_t max = 3 * max_page_cache / 4; |
| 1804 | |
| 1805 | // Assumption 2: Committing 32 pages at a time is sufficient to amortise |
| 1806 | // VirtualAlloc costs. |
| 1807 | size_t amortisation_threshold = 32; |
| 1808 | |
| 1809 | // extra_pages is the number of additional pages needed to meet |
| 1810 | // amortisation_threshold. |
| 1811 | size_t extra_pages = aReqPages < amortisation_threshold |
| 1812 | ? amortisation_threshold - aReqPages |
| 1813 | : 0; |
| 1814 | |
| 1815 | // If committing extra_pages isn't enough to hit the minimum target then |
| 1816 | // increase it. |
| 1817 | if (page_cache + extra_pages < min) { |
| 1818 | extra_pages = min - page_cache; |
| 1819 | } else if (page_cache + extra_pages > max) { |
| 1820 | // If committing extra_pages would exceed our maximum target then it may |
| 1821 | // still be useful to allocate extra pages. One of the reasons this can |
| 1822 | // happen could be fragmentation of the cache, |
| 1823 | |
| 1824 | // Therefore reduce the amortisation threshold so that we might allocate |
| 1825 | // some extra pages but avoid exceeding the dirty page cache. |
| 1826 | amortisation_threshold /= 2; |
| 1827 | extra_pages = std::min(aReqPages < amortisation_threshold |
| 1828 | ? amortisation_threshold - aReqPages |
| 1829 | : 0, |
| 1830 | max_page_cache - page_cache); |
| 1831 | } |
| 1832 | |
| 1833 | // Cap extra_pages to aRemainingPages and adjust aRemainingPages. We will |
| 1834 | // commit at least this many extra pages. |
| 1835 | extra_pages = std::min(extra_pages, aRemainingPages); |
| 1836 | |
| 1837 | // Finally if commiting a small number of additional pages now can prevent |
| 1838 | // a small commit later then try to commit a little more now, provided we |
| 1839 | // don't exceed max_page_cache. |
| 1840 | if ((aRemainingPages - extra_pages) < amortisation_threshold / 2 && |
| 1841 | (page_cache + aRemainingPages) < max_page_cache) { |
| 1842 | return aRemainingPages; |
| 1843 | } |
| 1844 | |
| 1845 | return extra_pages; |
| 1846 | } |
| 1847 | #endif |
| 1848 | |
| 1849 | ArenaPurgeResult arena_t::Purge(PurgeCondition aCond, PurgeStats& aStats) { |
| 1850 | arena_chunk_t* chunk; |
| 1851 | |
| 1852 | // The first critical section will find a chunk and mark dirty pages in it as |
| 1853 | // busy. |
| 1854 | { |
| 1855 | MaybeMutexAutoLock lock(mLock); |
| 1856 | |
| 1857 | if (mMustDeleteAfterPurge) { |
| 1858 | mIsPurgePending = false; |
| 1859 | return Dying; |
| 1860 | } |
| 1861 | |
| 1862 | #ifdef MOZ_DEBUG1 |
| 1863 | size_t ndirty = 0; |
| 1864 | for (auto* chunk : mChunksDirty.iter()) { |
| 1865 | ndirty += chunk->ndirty; |
| 1866 | } |
| 1867 | // Not all dirty chunks are in mChunksDirty as others might be being Purged. |
| 1868 | MOZ_ASSERT(ndirty <= mNumDirty)do { static_assert( mozilla::detail::AssertionConditionType< decltype(ndirty <= mNumDirty)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(ndirty <= mNumDirty))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("ndirty <= mNumDirty" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1868); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "ndirty <= mNumDirty" ")"); do { MOZ_CrashSequence (__null, 1868); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1869 | #endif |
| 1870 | |
| 1871 | if (!ShouldContinuePurge(aCond)) { |
| 1872 | mIsPurgePending = false; |
| 1873 | return ReachedThreshold; |
| 1874 | } |
| 1875 | |
| 1876 | // Take a single chunk and attempt to purge some of its dirty pages. The |
| 1877 | // loop below will purge memory from the chunk until either: |
| 1878 | // * The dirty page count for the arena hits its target, |
| 1879 | // * Another thread attempts to delete this chunk, or |
| 1880 | // * The chunk has no more dirty pages. |
| 1881 | // In any of these cases the loop will break and Purge() will return, which |
| 1882 | // means it may return before the arena meets its dirty page count target, |
| 1883 | // the return value is used by the caller to call Purge() again where it |
| 1884 | // will take the next chunk with dirty pages. |
| 1885 | chunk = mChunksDirty.Last(); |
| 1886 | if (!chunk) { |
| 1887 | // There are chunks with dirty pages (because mNumDirty > 0 above) but |
| 1888 | // they're not in mChunksDirty. That can happen if they're busy being |
| 1889 | // purged by other threads. |
| 1890 | // We have to clear the flag to preserve the invariant that if Purge() |
| 1891 | // returns false the flag is clear, if there's more purging work to do in |
| 1892 | // other chunks then either other calls to Purge() (in other threads) will |
| 1893 | // handle it or we rely on ShouldStartPurge() returning true at some point |
| 1894 | // in the future. |
| 1895 | mIsPurgePending = false; |
| 1896 | return Busy; |
| 1897 | } |
| 1898 | MOZ_ASSERT(chunk->ndirty > 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(chunk->ndirty > 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(chunk->ndirty > 0))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("chunk->ndirty > 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1898); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "chunk->ndirty > 0" ")"); do { MOZ_CrashSequence (__null, 1898); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1899 | |
| 1900 | // Mark the chunk as busy so it won't be deleted and remove it from |
| 1901 | // mChunksDirty so we're the only thread purging it. |
| 1902 | MOZ_ASSERT(!chunk->mIsPurging)do { static_assert( mozilla::detail::AssertionConditionType< decltype(!chunk->mIsPurging)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!chunk->mIsPurging))), 0) )) { do { } while (false); MOZ_ReportAssertionFailure("!chunk->mIsPurging" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1902); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "!chunk->mIsPurging" ")"); do { MOZ_CrashSequence (__null, 1902); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1903 | mChunksDirty.Remove(chunk); |
| 1904 | chunk->mIsPurging = true; |
| 1905 | aStats.chunks++; |
| 1906 | } // MaybeMutexAutoLock |
| 1907 | |
| 1908 | // True if we should continue purging memory from this arena. |
| 1909 | bool continue_purge_arena = true; |
| 1910 | |
| 1911 | // True if we should continue purging memory in this chunk. |
| 1912 | bool continue_purge_chunk = true; |
| 1913 | |
| 1914 | // True if at least one Purge operation has occured and therefore we need to |
| 1915 | // call FinishPurgingInChunk() before returning. |
| 1916 | bool purged_once = false; |
| 1917 | |
| 1918 | while (continue_purge_chunk && continue_purge_arena) { |
| 1919 | // This structure is used to communicate between the two PurgePhase |
| 1920 | // functions. |
| 1921 | PurgeInfo purge_info(*this, chunk, aStats); |
| 1922 | |
| 1923 | { |
| 1924 | // Phase 1: Find pages that need purging. |
| 1925 | MaybeMutexAutoLock lock(purge_info.mArena.mLock); |
| 1926 | MOZ_ASSERT(chunk->mIsPurging)do { static_assert( mozilla::detail::AssertionConditionType< decltype(chunk->mIsPurging)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(chunk->mIsPurging))), 0)) ) { do { } while (false); MOZ_ReportAssertionFailure("chunk->mIsPurging" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1926); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "chunk->mIsPurging" ")"); do { MOZ_CrashSequence (__null, 1926); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1927 | |
| 1928 | if (purge_info.mArena.mMustDeleteAfterPurge) { |
| 1929 | chunk->mIsPurging = false; |
| 1930 | purge_info.mArena.mIsPurgePending = false; |
| 1931 | return Dying; |
| 1932 | } |
| 1933 | |
| 1934 | continue_purge_chunk = purge_info.FindDirtyPages(purged_once); |
| 1935 | continue_purge_arena = purge_info.mArena.ShouldContinuePurge(aCond); |
| 1936 | |
| 1937 | // The code below will exit returning false if these are both false, so |
| 1938 | // clear mIsDeferredPurgeNeeded while we still hold the lock. |
| 1939 | if (!continue_purge_chunk && !continue_purge_arena) { |
| 1940 | purge_info.mArena.mIsPurgePending = false; |
| 1941 | } |
| 1942 | } |
| 1943 | if (!continue_purge_chunk) { |
| 1944 | if (chunk->mDying) { |
| 1945 | // Phase one already unlinked the chunk from structures, we just need to |
| 1946 | // release the memory. |
| 1947 | chunk_dealloc((void*)chunk, kChunkSize, ARENA_CHUNK); |
| 1948 | } |
| 1949 | // There's nothing else to do here, our caller may execute Purge() again |
| 1950 | // if continue_purge_arena is true. |
| 1951 | return continue_purge_arena ? NotDone : ReachedThreshold; |
| 1952 | } |
| 1953 | |
| 1954 | #ifdef MALLOC_DECOMMIT |
| 1955 | pages_decommit(purge_info.DirtyPtr(), purge_info.DirtyLenBytes()); |
| 1956 | #else |
| 1957 | # ifdef XP_SOLARIS |
| 1958 | posix_madvise(purge_info.DirtyPtr(), purge_info.DirtyLenBytes(), MADV_FREE8); |
| 1959 | # else |
| 1960 | madvise(purge_info.DirtyPtr(), purge_info.DirtyLenBytes(), MADV_FREE8); |
| 1961 | # endif |
| 1962 | #endif |
| 1963 | |
| 1964 | arena_chunk_t* chunk_to_release = nullptr; |
| 1965 | bool is_dying; |
| 1966 | { |
| 1967 | // Phase 2: Mark the pages with their final state (madvised or |
| 1968 | // decommitted) and fix up any other bookkeeping. |
| 1969 | MaybeMutexAutoLock lock(purge_info.mArena.mLock); |
| 1970 | MOZ_ASSERT(chunk->mIsPurging)do { static_assert( mozilla::detail::AssertionConditionType< decltype(chunk->mIsPurging)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(chunk->mIsPurging))), 0)) ) { do { } while (false); MOZ_ReportAssertionFailure("chunk->mIsPurging" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 1970); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "chunk->mIsPurging" ")"); do { MOZ_CrashSequence (__null, 1970); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 1971 | |
| 1972 | // We can't early exit if the arena is dying, we have to finish the purge |
| 1973 | // (which restores the state so the destructor will check it) and maybe |
| 1974 | // release the old spare arena. |
| 1975 | is_dying = purge_info.mArena.mMustDeleteAfterPurge; |
| 1976 | |
| 1977 | auto [cpc, ctr] = purge_info.UpdatePagesAndCounts(); |
| 1978 | continue_purge_chunk = cpc; |
| 1979 | chunk_to_release = ctr; |
| 1980 | continue_purge_arena = purge_info.mArena.ShouldContinuePurge(aCond); |
| 1981 | |
| 1982 | if (!continue_purge_chunk || !continue_purge_arena) { |
| 1983 | // We're going to stop purging here so update the chunk's bookkeeping. |
| 1984 | purge_info.FinishPurgingInChunk(true); |
| 1985 | purge_info.mArena.mIsPurgePending = false; |
| 1986 | } |
| 1987 | } // MaybeMutexAutoLock |
| 1988 | |
| 1989 | // Phase 2 can release the spare chunk (not always == chunk) so an extra |
| 1990 | // parameter is used to return that chunk. |
| 1991 | if (chunk_to_release) { |
| 1992 | chunk_dealloc((void*)chunk_to_release, kChunkSize, ARENA_CHUNK); |
| 1993 | } |
| 1994 | if (is_dying) { |
| 1995 | return Dying; |
| 1996 | } |
| 1997 | purged_once = true; |
| 1998 | } |
| 1999 | |
| 2000 | return continue_purge_arena ? NotDone : ReachedThreshold; |
| 2001 | } |
| 2002 | |
| 2003 | ArenaPurgeResult arena_t::PurgeLoop(PurgeCondition aCond, const char* aCaller, |
| 2004 | uint32_t aReuseGraceMS, |
| 2005 | Maybe<std::function<bool()>> aKeepGoing) { |
| 2006 | PurgeStats purge_stats(mId, mLabel, aCaller); |
| 2007 | |
| 2008 | #ifdef MOZJEMALLOC_PROFILING_CALLBACKS1 |
| 2009 | // We hold our own reference to callbacks for the duration of PurgeLoop to |
| 2010 | // make sure it's not released during purging. |
| 2011 | RefPtr<MallocProfilerCallbacks> callbacks = sCallbacks; |
| 2012 | TimeStamp start; |
| 2013 | if (callbacks) { |
| 2014 | start = TimeStamp::Now(); |
| 2015 | } |
| 2016 | #endif |
| 2017 | |
| 2018 | uint64_t reuseGraceNS = (uint64_t)aReuseGraceMS * 1000 * 1000; |
| 2019 | uint64_t now = aReuseGraceMS ? 0 : GetTimestampNS(); |
Value stored to 'now' during its initialization is never read | |
| 2020 | ArenaPurgeResult pr; |
| 2021 | do { |
| 2022 | pr = Purge(aCond, purge_stats); |
| 2023 | now = aReuseGraceMS ? 0 : GetTimestampNS(); |
| 2024 | } while ( |
| 2025 | pr == NotDone && |
| 2026 | (!aReuseGraceMS || (now - mLastSignificantReuseNS >= reuseGraceNS)) && |
| 2027 | (!aKeepGoing || (*aKeepGoing)())); |
| 2028 | |
| 2029 | #ifdef MOZJEMALLOC_PROFILING_CALLBACKS1 |
| 2030 | if (callbacks) { |
| 2031 | TimeStamp end = TimeStamp::Now(); |
| 2032 | // We can't hold an arena lock while committing profiler markers. |
| 2033 | callbacks->OnPurge(start, end, purge_stats, pr); |
| 2034 | } |
| 2035 | #endif |
| 2036 | |
| 2037 | return pr; |
| 2038 | } |
| 2039 | |
| 2040 | bool arena_t::PurgeInfo::FindDirtyPages(bool aPurgedOnce) { |
| 2041 | // It's possible that the previously dirty pages have now been |
| 2042 | // allocated or the chunk is dying. |
| 2043 | if (mChunk->ndirty == 0 || mChunk->mDying) { |
| 2044 | // Add the chunk to the mChunksMAdvised list if it's had at least one |
| 2045 | // madvise. |
| 2046 | FinishPurgingInChunk(aPurgedOnce); |
| 2047 | return false; |
| 2048 | } |
| 2049 | |
| 2050 | // Look for the first dirty page, as we do record the beginning of the run |
| 2051 | // that contains the dirty page. |
| 2052 | bool previous_page_is_allocated = true; |
| 2053 | for (size_t i = gChunkHeaderNumPages; i < gChunkNumPages - 1; i++) { |
| 2054 | size_t bits = mChunk->map[i].bits; |
| 2055 | |
| 2056 | // We must not find any busy pages because this chunk shouldn't be in |
| 2057 | // the dirty list. |
| 2058 | MOZ_ASSERT((bits & CHUNK_MAP_BUSY) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((bits & ((size_t)0x100U)) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((bits & ((size_t)0x100U) ) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(bits & ((size_t)0x100U)) == 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2058); AnnotateMozCrashReason("MOZ_ASSERT" "(" "(bits & ((size_t)0x100U)) == 0" ")"); do { MOZ_CrashSequence(__null, 2058); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2059 | |
| 2060 | // The first page belonging to a free run has the allocated bit clear |
| 2061 | // and a non-zero size. To distinguish it from the last page of a free |
| 2062 | // run we track the allocated bit of the previous page, if it's set |
| 2063 | // then this is the first. |
| 2064 | if ((bits & CHUNK_MAP_ALLOCATED((size_t)0x01U)) == 0 && (bits & ~gPageSizeMask) != 0 && |
| 2065 | previous_page_is_allocated) { |
| 2066 | mFreeRunInd = i; |
| 2067 | mFreeRunLen = bits >> gPageSize2Pow; |
| 2068 | } |
| 2069 | |
| 2070 | if (bits & CHUNK_MAP_DIRTY((size_t)0x08U)) { |
| 2071 | MOZ_ASSERT(do { static_assert( mozilla::detail::AssertionConditionType< decltype((mChunk->map[i].bits & (((size_t)0x80U) | ((size_t )0x40U) | ((size_t)0x20U))) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((mChunk->map[i].bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U))) == 0) )), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(mChunk->map[i].bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2072); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(mChunk->map[i].bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U))) == 0" ")"); do { MOZ_CrashSequence(__null, 2072); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 2072 | (mChunk->map[i].bits & CHUNK_MAP_FRESH_MADVISED_OR_DECOMMITTED) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((mChunk->map[i].bits & (((size_t)0x80U) | ((size_t )0x40U) | ((size_t)0x20U))) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((mChunk->map[i].bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U))) == 0) )), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(mChunk->map[i].bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2072); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(mChunk->map[i].bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U))) == 0" ")"); do { MOZ_CrashSequence(__null, 2072); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2073 | mDirtyInd = i; |
| 2074 | break; |
| 2075 | } |
| 2076 | |
| 2077 | previous_page_is_allocated = bits & CHUNK_MAP_ALLOCATED((size_t)0x01U); |
| 2078 | } |
| 2079 | MOZ_ASSERT(mDirtyInd != 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mDirtyInd != 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mDirtyInd != 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("mDirtyInd != 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2079); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mDirtyInd != 0" ")"); do { MOZ_CrashSequence (__null, 2079); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2080 | MOZ_ASSERT(mFreeRunInd >= gChunkHeaderNumPages)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mFreeRunInd >= gChunkHeaderNumPages)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!(mFreeRunInd >= gChunkHeaderNumPages))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("mFreeRunInd >= gChunkHeaderNumPages" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2080); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mFreeRunInd >= gChunkHeaderNumPages" ")" ); do { MOZ_CrashSequence(__null, 2080); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2081 | MOZ_ASSERT(mFreeRunInd <= mDirtyInd)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mFreeRunInd <= mDirtyInd)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mFreeRunInd <= mDirtyInd) )), 0))) { do { } while (false); MOZ_ReportAssertionFailure("mFreeRunInd <= mDirtyInd" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2081); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mFreeRunInd <= mDirtyInd" ")"); do { MOZ_CrashSequence (__null, 2081); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2082 | MOZ_ASSERT(mFreeRunLen > 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mFreeRunLen > 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mFreeRunLen > 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("mFreeRunLen > 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2082); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mFreeRunLen > 0" ")"); do { MOZ_CrashSequence (__null, 2082); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2083 | |
| 2084 | // Look for the next not-dirty page, it could be the guard page at the end |
| 2085 | // of the chunk. |
| 2086 | for (size_t i = 0; mDirtyInd + i < gChunkNumPages; i++) { |
| 2087 | size_t& bits = mChunk->map[mDirtyInd + i].bits; |
| 2088 | |
| 2089 | // We must not find any busy pages because this chunk shouldn't be in the |
| 2090 | // dirty list. |
| 2091 | MOZ_ASSERT(!(bits & CHUNK_MAP_BUSY))do { static_assert( mozilla::detail::AssertionConditionType< decltype(!(bits & ((size_t)0x100U)))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!(bits & ((size_t)0x100U ))))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("!(bits & ((size_t)0x100U))", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2091); AnnotateMozCrashReason("MOZ_ASSERT" "(" "!(bits & ((size_t)0x100U))" ")"); do { MOZ_CrashSequence(__null, 2091); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2092 | |
| 2093 | if (!(bits & CHUNK_MAP_DIRTY((size_t)0x08U))) { |
| 2094 | mDirtyNPages = i; |
| 2095 | break; |
| 2096 | } |
| 2097 | MOZ_ASSERT((bits & CHUNK_MAP_FRESH_MADVISED_OR_DECOMMITTED) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t )0x20U))) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!((bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U))) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2097); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(bits & (((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U))) == 0" ")"); do { MOZ_CrashSequence(__null, 2097); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2098 | bits ^= CHUNK_MAP_DIRTY((size_t)0x08U); |
| 2099 | } |
| 2100 | MOZ_ASSERT(mDirtyNPages > 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mDirtyNPages > 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mDirtyNPages > 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("mDirtyNPages > 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2100); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mDirtyNPages > 0" ")"); do { MOZ_CrashSequence (__null, 2100); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2101 | MOZ_ASSERT(mDirtyNPages <= mChunk->ndirty)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mDirtyNPages <= mChunk->ndirty)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mDirtyNPages <= mChunk-> ndirty))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("mDirtyNPages <= mChunk->ndirty", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2101); AnnotateMozCrashReason("MOZ_ASSERT" "(" "mDirtyNPages <= mChunk->ndirty" ")"); do { MOZ_CrashSequence(__null, 2101); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2102 | MOZ_ASSERT(mFreeRunInd + mFreeRunLen >= mDirtyInd + mDirtyNPages)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mFreeRunInd + mFreeRunLen >= mDirtyInd + mDirtyNPages )>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(mFreeRunInd + mFreeRunLen >= mDirtyInd + mDirtyNPages ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "mFreeRunInd + mFreeRunLen >= mDirtyInd + mDirtyNPages", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2102); AnnotateMozCrashReason("MOZ_ASSERT" "(" "mFreeRunInd + mFreeRunLen >= mDirtyInd + mDirtyNPages" ")"); do { MOZ_CrashSequence(__null, 2102); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2103 | |
| 2104 | // Mark the run as busy so that another thread freeing memory won't try to |
| 2105 | // coalesce it. |
| 2106 | mChunk->map[mFreeRunInd].bits |= CHUNK_MAP_BUSY((size_t)0x100U); |
| 2107 | mChunk->map[FreeRunLastInd()].bits |= CHUNK_MAP_BUSY((size_t)0x100U); |
| 2108 | |
| 2109 | mChunk->ndirty -= mDirtyNPages; |
| 2110 | mArena.mNumDirty -= mDirtyNPages; |
| 2111 | |
| 2112 | // Before we unlock ensure that no other thread can allocate from these |
| 2113 | // pages. |
| 2114 | if (mArena.mSpare != mChunk) { |
| 2115 | mArena.mRunsAvail.Remove(&mChunk->map[mFreeRunInd]); |
| 2116 | } |
| 2117 | return true; |
| 2118 | } |
| 2119 | |
| 2120 | std::pair<bool, arena_chunk_t*> arena_t::PurgeInfo::UpdatePagesAndCounts() { |
| 2121 | for (size_t i = 0; i < mDirtyNPages; i++) { |
| 2122 | // The page must not have any of the madvised, decommited or dirty bits |
| 2123 | // set. |
| 2124 | MOZ_ASSERT((mChunk->map[mDirtyInd + i].bits &do { static_assert( mozilla::detail::AssertionConditionType< decltype((mChunk->map[mDirtyInd + i].bits & ((((size_t )0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U ))) == 0)>::isValid, "invalid assertion condition"); if (( __builtin_expect(!!(!(!!((mChunk->map[mDirtyInd + i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t )0x08U))) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(mChunk->map[mDirtyInd + i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2126); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(mChunk->map[mDirtyInd + i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))) == 0" ")"); do { MOZ_CrashSequence(__null, 2126); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 2125 | (CHUNK_MAP_FRESH_MADVISED_OR_DECOMMITTED | CHUNK_MAP_DIRTY)) ==do { static_assert( mozilla::detail::AssertionConditionType< decltype((mChunk->map[mDirtyInd + i].bits & ((((size_t )0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U ))) == 0)>::isValid, "invalid assertion condition"); if (( __builtin_expect(!!(!(!!((mChunk->map[mDirtyInd + i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t )0x08U))) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(mChunk->map[mDirtyInd + i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2126); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(mChunk->map[mDirtyInd + i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))) == 0" ")"); do { MOZ_CrashSequence(__null, 2126); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 2126 | 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((mChunk->map[mDirtyInd + i].bits & ((((size_t )0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U ))) == 0)>::isValid, "invalid assertion condition"); if (( __builtin_expect(!!(!(!!((mChunk->map[mDirtyInd + i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t )0x08U))) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(mChunk->map[mDirtyInd + i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2126); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(mChunk->map[mDirtyInd + i].bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x08U))) == 0" ")"); do { MOZ_CrashSequence(__null, 2126); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2127 | #ifdef MALLOC_DECOMMIT |
| 2128 | const size_t free_operation = CHUNK_MAP_DECOMMITTED((size_t)0x20U); |
| 2129 | #else |
| 2130 | const size_t free_operation = CHUNK_MAP_MADVISED((size_t)0x40U); |
| 2131 | #endif |
| 2132 | mChunk->map[mDirtyInd + i].bits ^= free_operation; |
| 2133 | } |
| 2134 | |
| 2135 | // Remove the CHUNK_MAP_BUSY marks from the run. |
| 2136 | #ifdef MOZ_DEBUG1 |
| 2137 | MOZ_ASSERT(mChunk->map[mFreeRunInd].bits & CHUNK_MAP_BUSY)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mChunk->map[mFreeRunInd].bits & ((size_t)0x100U ))>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(mChunk->map[mFreeRunInd].bits & ((size_t)0x100U )))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("mChunk->map[mFreeRunInd].bits & ((size_t)0x100U)", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2137); AnnotateMozCrashReason("MOZ_ASSERT" "(" "mChunk->map[mFreeRunInd].bits & ((size_t)0x100U)" ")"); do { MOZ_CrashSequence(__null, 2137); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2138 | MOZ_ASSERT(mChunk->map[FreeRunLastInd()].bits & CHUNK_MAP_BUSY)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mChunk->map[FreeRunLastInd()].bits & ((size_t )0x100U))>::isValid, "invalid assertion condition"); if (( __builtin_expect(!!(!(!!(mChunk->map[FreeRunLastInd()].bits & ((size_t)0x100U)))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("mChunk->map[FreeRunLastInd()].bits & ((size_t)0x100U)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2138); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mChunk->map[FreeRunLastInd()].bits & ((size_t)0x100U)" ")"); do { MOZ_CrashSequence(__null, 2138); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2139 | #endif |
| 2140 | mChunk->map[mFreeRunInd].bits &= ~CHUNK_MAP_BUSY((size_t)0x100U); |
| 2141 | mChunk->map[FreeRunLastInd()].bits &= ~CHUNK_MAP_BUSY((size_t)0x100U); |
| 2142 | |
| 2143 | #ifndef MALLOC_DECOMMIT |
| 2144 | mArena.mNumMAdvised += mDirtyNPages; |
| 2145 | #endif |
| 2146 | |
| 2147 | mArena.mStats.committed -= mDirtyNPages; |
| 2148 | mPurgeStats.pages += mDirtyNPages; |
| 2149 | mPurgeStats.system_calls++; |
| 2150 | |
| 2151 | if (mChunk->mDying) { |
| 2152 | // A dying chunk doesn't need to be coaleased, it will already have one |
| 2153 | // large run. |
| 2154 | MOZ_ASSERT(mFreeRunInd == gChunkHeaderNumPages &&do { static_assert( mozilla::detail::AssertionConditionType< decltype(mFreeRunInd == gChunkHeaderNumPages && mFreeRunLen == gChunkNumPages - gChunkHeaderNumPages - 1)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mFreeRunInd == gChunkHeaderNumPages && mFreeRunLen == gChunkNumPages - gChunkHeaderNumPages - 1))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("mFreeRunInd == gChunkHeaderNumPages && mFreeRunLen == gChunkNumPages - gChunkHeaderNumPages - 1" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2155); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mFreeRunInd == gChunkHeaderNumPages && mFreeRunLen == gChunkNumPages - gChunkHeaderNumPages - 1" ")"); do { MOZ_CrashSequence(__null, 2155); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 2155 | mFreeRunLen == gChunkNumPages - gChunkHeaderNumPages - 1)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mFreeRunInd == gChunkHeaderNumPages && mFreeRunLen == gChunkNumPages - gChunkHeaderNumPages - 1)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mFreeRunInd == gChunkHeaderNumPages && mFreeRunLen == gChunkNumPages - gChunkHeaderNumPages - 1))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("mFreeRunInd == gChunkHeaderNumPages && mFreeRunLen == gChunkNumPages - gChunkHeaderNumPages - 1" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2155); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mFreeRunInd == gChunkHeaderNumPages && mFreeRunLen == gChunkNumPages - gChunkHeaderNumPages - 1" ")"); do { MOZ_CrashSequence(__null, 2155); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2156 | |
| 2157 | return std::make_pair(false, mChunk); |
| 2158 | } |
| 2159 | |
| 2160 | bool was_empty = mChunk->IsEmpty(); |
| 2161 | mFreeRunInd = |
| 2162 | mArena.TryCoalesce(mChunk, mFreeRunInd, mFreeRunLen, FreeRunLenBytes()); |
| 2163 | |
| 2164 | arena_chunk_t* chunk_to_release = nullptr; |
| 2165 | if (!was_empty && mChunk->IsEmpty()) { |
| 2166 | // This now-empty chunk will become the spare chunk and the spare |
| 2167 | // chunk will be returned for deletion. |
| 2168 | chunk_to_release = mArena.DemoteChunkToSpare(mChunk); |
| 2169 | } |
| 2170 | |
| 2171 | if (mChunk != mArena.mSpare) { |
| 2172 | mArena.mRunsAvail.Insert(&mChunk->map[mFreeRunInd]); |
| 2173 | } |
| 2174 | |
| 2175 | return std::make_pair(mChunk->ndirty != 0, chunk_to_release); |
| 2176 | } |
| 2177 | |
| 2178 | void arena_t::PurgeInfo::FinishPurgingInChunk(bool aAddToMAdvised) { |
| 2179 | // If there's no more purge activity for this chunk then finish up while |
| 2180 | // we still have the lock. |
| 2181 | MOZ_ASSERT(mChunk->mIsPurging)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mChunk->mIsPurging)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mChunk->mIsPurging))), 0) )) { do { } while (false); MOZ_ReportAssertionFailure("mChunk->mIsPurging" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2181); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mChunk->mIsPurging" ")"); do { MOZ_CrashSequence (__null, 2181); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2182 | mChunk->mIsPurging = false; |
| 2183 | |
| 2184 | if (mChunk->mDying) { |
| 2185 | // Another thread tried to delete this chunk while we weren't holding |
| 2186 | // the lock. Now it's our responsibility to finish deleting it. First |
| 2187 | // clear its dirty pages so that RemoveChunk() doesn't try to remove it |
| 2188 | // from mChunksDirty because it won't be there. |
| 2189 | mArena.mNumDirty -= mChunk->ndirty; |
| 2190 | mArena.mStats.committed -= mChunk->ndirty; |
| 2191 | mChunk->ndirty = 0; |
| 2192 | |
| 2193 | DebugOnly<bool> release_chunk = mArena.RemoveChunk(mChunk); |
| 2194 | // RemoveChunk() can't return false because mIsPurging was false |
| 2195 | // during the call. |
| 2196 | MOZ_ASSERT(release_chunk)do { static_assert( mozilla::detail::AssertionConditionType< decltype(release_chunk)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(release_chunk))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("release_chunk", "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2196); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "release_chunk" ")"); do { MOZ_CrashSequence (__null, 2196); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2197 | return; |
| 2198 | } |
| 2199 | |
| 2200 | if (mChunk->ndirty != 0) { |
| 2201 | mArena.mChunksDirty.Insert(mChunk); |
| 2202 | } |
| 2203 | |
| 2204 | #ifdef MALLOC_DOUBLE_PURGE |
| 2205 | if (aAddToMAdvised) { |
| 2206 | // The chunk might already be in the list, but this |
| 2207 | // makes sure it's at the front. |
| 2208 | if (mArena.mChunksMAdvised.ElementProbablyInList(mChunk)) { |
| 2209 | mArena.mChunksMAdvised.remove(mChunk); |
| 2210 | } |
| 2211 | mArena.mChunksMAdvised.pushFront(mChunk); |
| 2212 | } |
| 2213 | #endif |
| 2214 | } |
| 2215 | |
| 2216 | // run_pages and size make each-other redundant. But we use them both and the |
| 2217 | // caller computes both so this function requires both and will assert if they |
| 2218 | // are inconsistent. |
| 2219 | size_t arena_t::TryCoalesce(arena_chunk_t* aChunk, size_t run_ind, |
| 2220 | size_t run_pages, size_t size) { |
| 2221 | // Copy in/out parameters to local variables so that we don't need '*' |
| 2222 | // operators throughout this code but also so that type checking is stricter |
| 2223 | // (references are too easily coerced). |
| 2224 | MOZ_ASSERT(size == run_pages << gPageSize2Pow)do { static_assert( mozilla::detail::AssertionConditionType< decltype(size == run_pages << gPageSize2Pow)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!(size == run_pages << gPageSize2Pow))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("size == run_pages << gPageSize2Pow" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2224); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "size == run_pages << gPageSize2Pow" ")" ); do { MOZ_CrashSequence(__null, 2224); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2225 | |
| 2226 | // Try to coalesce forward. |
| 2227 | if (run_ind + run_pages < gChunkNumPages - 1 && |
| 2228 | (aChunk->map[run_ind + run_pages].bits & |
| 2229 | (CHUNK_MAP_ALLOCATED((size_t)0x01U) | CHUNK_MAP_BUSY((size_t)0x100U))) == 0) { |
| 2230 | size_t nrun_size = aChunk->map[run_ind + run_pages].bits & ~gPageSizeMask; |
| 2231 | |
| 2232 | // Remove successor from tree of available runs; the coalesced run is |
| 2233 | // inserted later. |
| 2234 | mRunsAvail.Remove(&aChunk->map[run_ind + run_pages]); |
| 2235 | |
| 2236 | size += nrun_size; |
| 2237 | run_pages = size >> gPageSize2Pow; |
| 2238 | |
| 2239 | MOZ_DIAGNOSTIC_ASSERT((aChunk->map[run_ind + run_pages - 1].bits &do { static_assert( mozilla::detail::AssertionConditionType< decltype((aChunk->map[run_ind + run_pages - 1].bits & ~ gPageSizeMask) == nrun_size)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((aChunk->map[run_ind + run_pages - 1].bits & ~gPageSizeMask) == nrun_size))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(aChunk->map[run_ind + run_pages - 1].bits & ~gPageSizeMask) == nrun_size" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2240); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "(aChunk->map[run_ind + run_pages - 1].bits & ~gPageSizeMask) == nrun_size" ")"); do { MOZ_CrashSequence(__null, 2240); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 2240 | ~gPageSizeMask) == nrun_size)do { static_assert( mozilla::detail::AssertionConditionType< decltype((aChunk->map[run_ind + run_pages - 1].bits & ~ gPageSizeMask) == nrun_size)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((aChunk->map[run_ind + run_pages - 1].bits & ~gPageSizeMask) == nrun_size))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(aChunk->map[run_ind + run_pages - 1].bits & ~gPageSizeMask) == nrun_size" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2240); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "(aChunk->map[run_ind + run_pages - 1].bits & ~gPageSizeMask) == nrun_size" ")"); do { MOZ_CrashSequence(__null, 2240); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2241 | aChunk->map[run_ind].bits = |
| 2242 | size | (aChunk->map[run_ind].bits & gPageSizeMask); |
| 2243 | aChunk->map[run_ind + run_pages - 1].bits = |
| 2244 | size | (aChunk->map[run_ind + run_pages - 1].bits & gPageSizeMask); |
| 2245 | } |
| 2246 | |
| 2247 | // Try to coalesce backward. |
| 2248 | if (run_ind > gChunkHeaderNumPages && |
| 2249 | (aChunk->map[run_ind - 1].bits & |
| 2250 | (CHUNK_MAP_ALLOCATED((size_t)0x01U) | CHUNK_MAP_BUSY((size_t)0x100U))) == 0) { |
| 2251 | size_t prun_size = aChunk->map[run_ind - 1].bits & ~gPageSizeMask; |
| 2252 | |
| 2253 | run_ind -= prun_size >> gPageSize2Pow; |
| 2254 | |
| 2255 | // Remove predecessor from tree of available runs; the coalesced run is |
| 2256 | // inserted later. |
| 2257 | mRunsAvail.Remove(&aChunk->map[run_ind]); |
| 2258 | |
| 2259 | size += prun_size; |
| 2260 | run_pages = size >> gPageSize2Pow; |
| 2261 | |
| 2262 | MOZ_DIAGNOSTIC_ASSERT((aChunk->map[run_ind].bits & ~gPageSizeMask) ==do { static_assert( mozilla::detail::AssertionConditionType< decltype((aChunk->map[run_ind].bits & ~gPageSizeMask) == prun_size)>::isValid, "invalid assertion condition"); if ( (__builtin_expect(!!(!(!!((aChunk->map[run_ind].bits & ~gPageSizeMask) == prun_size))), 0))) { do { } while (false) ; MOZ_ReportAssertionFailure("(aChunk->map[run_ind].bits & ~gPageSizeMask) == prun_size" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2263); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "(aChunk->map[run_ind].bits & ~gPageSizeMask) == prun_size" ")"); do { MOZ_CrashSequence(__null, 2263); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 2263 | prun_size)do { static_assert( mozilla::detail::AssertionConditionType< decltype((aChunk->map[run_ind].bits & ~gPageSizeMask) == prun_size)>::isValid, "invalid assertion condition"); if ( (__builtin_expect(!!(!(!!((aChunk->map[run_ind].bits & ~gPageSizeMask) == prun_size))), 0))) { do { } while (false) ; MOZ_ReportAssertionFailure("(aChunk->map[run_ind].bits & ~gPageSizeMask) == prun_size" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2263); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "(aChunk->map[run_ind].bits & ~gPageSizeMask) == prun_size" ")"); do { MOZ_CrashSequence(__null, 2263); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2264 | aChunk->map[run_ind].bits = |
| 2265 | size | (aChunk->map[run_ind].bits & gPageSizeMask); |
| 2266 | aChunk->map[run_ind + run_pages - 1].bits = |
| 2267 | size | (aChunk->map[run_ind + run_pages - 1].bits & gPageSizeMask); |
| 2268 | } |
| 2269 | |
| 2270 | return run_ind; |
| 2271 | } |
| 2272 | |
| 2273 | arena_chunk_t* arena_t::DallocRun(arena_run_t* aRun, bool aDirty) { |
| 2274 | arena_chunk_t* chunk; |
| 2275 | size_t size, run_ind, run_pages; |
| 2276 | |
| 2277 | chunk = GetChunkForPtr(aRun); |
| 2278 | run_ind = (size_t)((uintptr_t(aRun) - uintptr_t(chunk)) >> gPageSize2Pow); |
| 2279 | MOZ_DIAGNOSTIC_ASSERT(run_ind >= gChunkHeaderNumPages)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run_ind >= gChunkHeaderNumPages)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run_ind >= gChunkHeaderNumPages ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "run_ind >= gChunkHeaderNumPages", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2279); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "run_ind >= gChunkHeaderNumPages" ")"); do { MOZ_CrashSequence(__null, 2279); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2280 | MOZ_RELEASE_ASSERT(run_ind < gChunkNumPages - 1)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run_ind < gChunkNumPages - 1)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run_ind < gChunkNumPages - 1))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("run_ind < gChunkNumPages - 1", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2280); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "run_ind < gChunkNumPages - 1" ")"); do { MOZ_CrashSequence(__null, 2280); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2281 | if ((chunk->map[run_ind].bits & CHUNK_MAP_LARGE((size_t)0x02U)) != 0) { |
| 2282 | size = chunk->map[run_ind].bits & ~gPageSizeMask; |
| 2283 | run_pages = (size >> gPageSize2Pow); |
| 2284 | } else { |
| 2285 | run_pages = aRun->mBin->mRunSizePages; |
| 2286 | size = run_pages << gPageSize2Pow; |
| 2287 | } |
| 2288 | |
| 2289 | // Mark pages as unallocated in the chunk map. |
| 2290 | if (aDirty) { |
| 2291 | size_t i; |
| 2292 | |
| 2293 | for (i = 0; i < run_pages; i++) { |
| 2294 | MOZ_DIAGNOSTIC_ASSERT((chunk->map[run_ind + i].bits & CHUNK_MAP_DIRTY) ==do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[run_ind + i].bits & ((size_t)0x08U )) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((chunk->map[run_ind + i].bits & ((size_t)0x08U )) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(chunk->map[run_ind + i].bits & ((size_t)0x08U)) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2295); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "(chunk->map[run_ind + i].bits & ((size_t)0x08U)) == 0" ")"); do { MOZ_CrashSequence(__null, 2295); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 2295 | 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((chunk->map[run_ind + i].bits & ((size_t)0x08U )) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((chunk->map[run_ind + i].bits & ((size_t)0x08U )) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(chunk->map[run_ind + i].bits & ((size_t)0x08U)) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2295); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "(chunk->map[run_ind + i].bits & ((size_t)0x08U)) == 0" ")"); do { MOZ_CrashSequence(__null, 2295); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2296 | chunk->map[run_ind + i].bits = CHUNK_MAP_DIRTY((size_t)0x08U); |
| 2297 | } |
| 2298 | |
| 2299 | if (chunk->ndirty == 0 && !chunk->mIsPurging) { |
| 2300 | mChunksDirty.Insert(chunk); |
| 2301 | } |
| 2302 | chunk->ndirty += run_pages; |
| 2303 | mNumDirty += run_pages; |
| 2304 | } else { |
| 2305 | size_t i; |
| 2306 | |
| 2307 | for (i = 0; i < run_pages; i++) { |
| 2308 | chunk->map[run_ind + i].bits &= ~(CHUNK_MAP_LARGE((size_t)0x02U) | CHUNK_MAP_ALLOCATED((size_t)0x01U)); |
| 2309 | } |
| 2310 | } |
| 2311 | chunk->map[run_ind].bits = size | (chunk->map[run_ind].bits & gPageSizeMask); |
| 2312 | chunk->map[run_ind + run_pages - 1].bits = |
| 2313 | size | (chunk->map[run_ind + run_pages - 1].bits & gPageSizeMask); |
| 2314 | |
| 2315 | run_ind = TryCoalesce(chunk, run_ind, run_pages, size); |
| 2316 | |
| 2317 | // Deallocate chunk if it is now completely unused. |
| 2318 | arena_chunk_t* chunk_dealloc = nullptr; |
| 2319 | if (chunk->IsEmpty()) { |
| 2320 | chunk_dealloc = DemoteChunkToSpare(chunk); |
| 2321 | } else { |
| 2322 | // Insert into tree of available runs, now that coalescing is complete. |
| 2323 | mRunsAvail.Insert(&chunk->map[run_ind]); |
| 2324 | } |
| 2325 | |
| 2326 | return chunk_dealloc; |
| 2327 | } |
| 2328 | |
| 2329 | void arena_t::TrimRunHead(arena_chunk_t* aChunk, arena_run_t* aRun, |
| 2330 | size_t aOldSize, size_t aNewSize) { |
| 2331 | size_t pageind = (uintptr_t(aRun) - uintptr_t(aChunk)) >> gPageSize2Pow; |
| 2332 | size_t head_npages = (aOldSize - aNewSize) >> gPageSize2Pow; |
| 2333 | |
| 2334 | MOZ_ASSERT(aOldSize > aNewSize)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aOldSize > aNewSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aOldSize > aNewSize))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("aOldSize > aNewSize" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2334); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aOldSize > aNewSize" ")"); do { MOZ_CrashSequence (__null, 2334); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2335 | |
| 2336 | // Update the chunk map so that arena_t::RunDalloc() can treat the |
| 2337 | // leading run as separately allocated. |
| 2338 | aChunk->map[pageind].bits = |
| 2339 | (aOldSize - aNewSize) | CHUNK_MAP_LARGE((size_t)0x02U) | CHUNK_MAP_ALLOCATED((size_t)0x01U); |
| 2340 | aChunk->map[pageind + head_npages].bits = |
| 2341 | aNewSize | CHUNK_MAP_LARGE((size_t)0x02U) | CHUNK_MAP_ALLOCATED((size_t)0x01U); |
| 2342 | |
| 2343 | DebugOnly<arena_chunk_t*> no_chunk = DallocRun(aRun, false); |
| 2344 | // This will never release a chunk as there's still at least one allocated |
| 2345 | // run. |
| 2346 | MOZ_ASSERT(!no_chunk)do { static_assert( mozilla::detail::AssertionConditionType< decltype(!no_chunk)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!no_chunk))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("!no_chunk", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2346); AnnotateMozCrashReason("MOZ_ASSERT" "(" "!no_chunk" ")" ); do { MOZ_CrashSequence(__null, 2346); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2347 | } |
| 2348 | |
| 2349 | void arena_t::TrimRunTail(arena_chunk_t* aChunk, arena_run_t* aRun, |
| 2350 | size_t aOldSize, size_t aNewSize, bool aDirty) { |
| 2351 | size_t pageind = (uintptr_t(aRun) - uintptr_t(aChunk)) >> gPageSize2Pow; |
| 2352 | size_t npages = aNewSize >> gPageSize2Pow; |
| 2353 | |
| 2354 | MOZ_ASSERT(aOldSize > aNewSize)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aOldSize > aNewSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aOldSize > aNewSize))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("aOldSize > aNewSize" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2354); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aOldSize > aNewSize" ")"); do { MOZ_CrashSequence (__null, 2354); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2355 | |
| 2356 | // Update the chunk map so that arena_t::RunDalloc() can treat the |
| 2357 | // trailing run as separately allocated. |
| 2358 | aChunk->map[pageind].bits = aNewSize | CHUNK_MAP_LARGE((size_t)0x02U) | CHUNK_MAP_ALLOCATED((size_t)0x01U); |
| 2359 | aChunk->map[pageind + npages].bits = |
| 2360 | (aOldSize - aNewSize) | CHUNK_MAP_LARGE((size_t)0x02U) | CHUNK_MAP_ALLOCATED((size_t)0x01U); |
| 2361 | |
| 2362 | DebugOnly<arena_chunk_t*> no_chunk = |
| 2363 | DallocRun((arena_run_t*)(uintptr_t(aRun) + aNewSize), aDirty); |
| 2364 | |
| 2365 | // This will never release a chunk as there's still at least one allocated |
| 2366 | // run. |
| 2367 | MOZ_ASSERT(!no_chunk)do { static_assert( mozilla::detail::AssertionConditionType< decltype(!no_chunk)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!no_chunk))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("!no_chunk", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2367); AnnotateMozCrashReason("MOZ_ASSERT" "(" "!no_chunk" ")" ); do { MOZ_CrashSequence(__null, 2367); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2368 | } |
| 2369 | |
| 2370 | arena_run_t* arena_t::GetNewEmptyBinRun(arena_bin_t* aBin) { |
| 2371 | arena_run_t* run; |
| 2372 | unsigned i, remainder; |
| 2373 | |
| 2374 | // Allocate a new run. |
| 2375 | run = AllocRun(static_cast<size_t>(aBin->mRunSizePages) << gPageSize2Pow, |
| 2376 | false, false); |
| 2377 | if (!run) { |
| 2378 | return nullptr; |
| 2379 | } |
| 2380 | |
| 2381 | // Initialize run internals. |
| 2382 | run->mBin = aBin; |
| 2383 | |
| 2384 | for (i = 0; i < aBin->mRunNumRegionsMask - 1; i++) { |
| 2385 | run->mRegionsMask[i] = UINT_MAX(2147483647 *2U +1U); |
| 2386 | } |
| 2387 | remainder = aBin->mRunNumRegions & ((1U << (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3)) - 1); |
| 2388 | if (remainder == 0) { |
| 2389 | run->mRegionsMask[i] = UINT_MAX(2147483647 *2U +1U); |
| 2390 | } else { |
| 2391 | // The last element has spare bits that need to be unset. |
| 2392 | run->mRegionsMask[i] = |
| 2393 | (UINT_MAX(2147483647 *2U +1U) >> ((1U << (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3)) - remainder)); |
| 2394 | } |
| 2395 | |
| 2396 | run->mRegionsMinElement = 0; |
| 2397 | |
| 2398 | run->mNumFree = aBin->mRunNumRegions; |
| 2399 | #if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED1) |
| 2400 | run->mMagic = ARENA_RUN_MAGIC0x384adf93; |
| 2401 | #endif |
| 2402 | |
| 2403 | // Make sure we continue to use this run for subsequent allocations. |
| 2404 | new (&run->mRunListElem) DoublyLinkedListElement<arena_run_t>(); |
| 2405 | aBin->mNonFullRuns.pushFront(run); |
| 2406 | |
| 2407 | aBin->mNumRuns++; |
| 2408 | return run; |
| 2409 | } |
| 2410 | |
| 2411 | arena_run_t* arena_t::GetNonFullBinRun(arena_bin_t* aBin) { |
| 2412 | auto mrf_head = aBin->mNonFullRuns.begin(); |
| 2413 | if (mrf_head) { |
| 2414 | // Take the head and if we are going to fill it, remove it from our list. |
| 2415 | arena_run_t* run = &(*mrf_head); |
| 2416 | MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run->mMagic == 0x384adf93)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run->mMagic == 0x384adf93 ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "run->mMagic == 0x384adf93", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2416); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "run->mMagic == 0x384adf93" ")"); do { MOZ_CrashSequence(__null, 2416); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2417 | if (run->mNumFree == 1) { |
| 2418 | aBin->mNonFullRuns.remove(run); |
| 2419 | } |
| 2420 | return run; |
| 2421 | } |
| 2422 | return GetNewEmptyBinRun(aBin); |
| 2423 | } |
| 2424 | |
| 2425 | void arena_bin_t::Init(SizeClass aSizeClass) { |
| 2426 | size_t try_run_size; |
| 2427 | unsigned try_nregs, try_mask_nelms, try_reg0_offset; |
| 2428 | // Size of the run header, excluding mRegionsMask. |
| 2429 | static const size_t kFixedHeaderSize = offsetof(arena_run_t, mRegionsMask)__builtin_offsetof(arena_run_t, mRegionsMask); |
| 2430 | |
| 2431 | MOZ_ASSERT(aSizeClass.Size() <= gMaxBinClass)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aSizeClass.Size() <= (gMaxSubPageClass ? gMaxSubPageClass : kMaxQuantumWideClass))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aSizeClass.Size() <= (gMaxSubPageClass ? gMaxSubPageClass : kMaxQuantumWideClass)))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aSizeClass.Size() <= (gMaxSubPageClass ? gMaxSubPageClass : kMaxQuantumWideClass)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2431); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aSizeClass.Size() <= (gMaxSubPageClass ? gMaxSubPageClass : kMaxQuantumWideClass)" ")"); do { MOZ_CrashSequence(__null, 2431); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2432 | |
| 2433 | try_run_size = gPageSize; |
| 2434 | |
| 2435 | mSizeClass = aSizeClass.Size(); |
| 2436 | mNumRuns = 0; |
| 2437 | |
| 2438 | // Run size expansion loop. |
| 2439 | while (true) { |
| 2440 | try_nregs = ((try_run_size - kFixedHeaderSize) / mSizeClass) + |
| 2441 | 1; // Counter-act try_nregs-- in loop. |
| 2442 | |
| 2443 | // The do..while loop iteratively reduces the number of regions until |
| 2444 | // the run header and the regions no longer overlap. A closed formula |
| 2445 | // would be quite messy, since there is an interdependency between the |
| 2446 | // header's mask length and the number of regions. |
| 2447 | do { |
| 2448 | try_nregs--; |
| 2449 | try_mask_nelms = |
| 2450 | (try_nregs >> (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3)) + |
| 2451 | ((try_nregs & ((1U << (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3)) - 1)) ? 1 : 0); |
| 2452 | try_reg0_offset = try_run_size - (try_nregs * mSizeClass); |
| 2453 | } while (kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms) > |
| 2454 | try_reg0_offset); |
| 2455 | |
| 2456 | // Try to keep the run overhead below kRunOverhead. |
| 2457 | if (Fraction(try_reg0_offset, try_run_size) <= kRunOverhead) { |
| 2458 | break; |
| 2459 | } |
| 2460 | |
| 2461 | // If the overhead is larger than the size class, it means the size class |
| 2462 | // is small and doesn't align very well with the header. It's desirable to |
| 2463 | // have smaller run sizes for them, so relax the overhead requirement. |
| 2464 | if (try_reg0_offset > mSizeClass) { |
| 2465 | if (Fraction(try_reg0_offset, try_run_size) <= kRunRelaxedOverhead) { |
| 2466 | break; |
| 2467 | } |
| 2468 | } |
| 2469 | |
| 2470 | // The run header includes one bit per region of the given size. For sizes |
| 2471 | // small enough, the number of regions is large enough that growing the run |
| 2472 | // size barely moves the needle for the overhead because of all those bits. |
| 2473 | // For example, for a size of 8 bytes, adding 4KiB to the run size adds |
| 2474 | // close to 512 bits to the header, which is 64 bytes. |
| 2475 | // With such overhead, there is no way to get to the wanted overhead above, |
| 2476 | // so we give up if the required size for mRegionsMask more than doubles the |
| 2477 | // size of the run header. |
| 2478 | if (try_mask_nelms * sizeof(unsigned) >= kFixedHeaderSize) { |
| 2479 | break; |
| 2480 | } |
| 2481 | |
| 2482 | // If next iteration is going to be larger than the largest possible large |
| 2483 | // size class, then we didn't find a setup where the overhead is small |
| 2484 | // enough, and we can't do better than the current settings, so just use |
| 2485 | // that. |
| 2486 | if (try_run_size + gPageSize > gMaxLargeClass) { |
| 2487 | break; |
| 2488 | } |
| 2489 | |
| 2490 | // Try more aggressive settings. |
| 2491 | try_run_size += gPageSize; |
| 2492 | } |
| 2493 | |
| 2494 | MOZ_ASSERT(kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms) <=do { static_assert( mozilla::detail::AssertionConditionType< decltype(kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms ) <= try_reg0_offset)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(kFixedHeaderSize + (sizeof(unsigned ) * try_mask_nelms) <= try_reg0_offset))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms) <= try_reg0_offset" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2495); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms) <= try_reg0_offset" ")"); do { MOZ_CrashSequence(__null, 2495); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 2495 | try_reg0_offset)do { static_assert( mozilla::detail::AssertionConditionType< decltype(kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms ) <= try_reg0_offset)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(kFixedHeaderSize + (sizeof(unsigned ) * try_mask_nelms) <= try_reg0_offset))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms) <= try_reg0_offset" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2495); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms) <= try_reg0_offset" ")"); do { MOZ_CrashSequence(__null, 2495); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2496 | MOZ_ASSERT((try_mask_nelms << (LOG2(sizeof(int)) + 3)) >= try_nregs)do { static_assert( mozilla::detail::AssertionConditionType< decltype((try_mask_nelms << (Log2<sizeof(int)>::value + 3)) >= try_nregs)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((try_mask_nelms << (Log2 <sizeof(int)>::value + 3)) >= try_nregs))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(try_mask_nelms << (Log2<sizeof(int)>::value + 3)) >= try_nregs" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2496); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(try_mask_nelms << (Log2<sizeof(int)>::value + 3)) >= try_nregs" ")"); do { MOZ_CrashSequence(__null, 2496); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2497 | |
| 2498 | // Our list management would break if mRunNumRegions == 1 and we should use |
| 2499 | // a large size class instead, anyways. |
| 2500 | MOZ_ASSERT(try_nregs > 1)do { static_assert( mozilla::detail::AssertionConditionType< decltype(try_nregs > 1)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(try_nregs > 1))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("try_nregs > 1" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2500); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "try_nregs > 1" ")"); do { MOZ_CrashSequence (__null, 2500); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2501 | |
| 2502 | // Copy final settings. |
| 2503 | MOZ_ASSERT((try_run_size >> gPageSize2Pow) <= UINT8_MAX)do { static_assert( mozilla::detail::AssertionConditionType< decltype((try_run_size >> gPageSize2Pow) <= (255))> ::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((try_run_size >> gPageSize2Pow) <= (255)))) , 0))) { do { } while (false); MOZ_ReportAssertionFailure("(try_run_size >> gPageSize2Pow) <= (255)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2503); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(try_run_size >> gPageSize2Pow) <= (255)" ")"); do { MOZ_CrashSequence(__null, 2503); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2504 | mRunSizePages = static_cast<uint8_t>(try_run_size >> gPageSize2Pow); |
| 2505 | mRunNumRegions = try_nregs; |
| 2506 | mRunNumRegionsMask = try_mask_nelms; |
| 2507 | mRunFirstRegionOffset = try_reg0_offset; |
| 2508 | mSizeDivisor = FastDivisor<uint16_t>(aSizeClass.Size(), try_run_size); |
| 2509 | } |
| 2510 | |
| 2511 | void arena_t::ResetSmallAllocRandomization() { |
| 2512 | if (MOZ_UNLIKELY(opt_randomize_small)(__builtin_expect(!!(opt_randomize_small), 0))) { |
| 2513 | MaybeMutexAutoLock lock(mLock); |
| 2514 | InitPRNG(); |
| 2515 | } |
| 2516 | mRandomizeSmallAllocations = opt_randomize_small; |
| 2517 | } |
| 2518 | |
| 2519 | void arena_t::InitPRNG() { |
| 2520 | // Both another thread could race and the code backing RandomUint64 |
| 2521 | // (arc4random for example) may allocate memory while here, so we must |
| 2522 | // ensure to start the mPRNG initialization only once and to not hold |
| 2523 | // the lock while initializing. |
| 2524 | mIsPRNGInitializing = true; |
| 2525 | { |
| 2526 | mLock.Unlock(); |
| 2527 | mozilla::Maybe<uint64_t> prngState1 = mozilla::RandomUint64(); |
| 2528 | mozilla::Maybe<uint64_t> prngState2 = mozilla::RandomUint64(); |
| 2529 | mLock.Lock(); |
| 2530 | |
| 2531 | mozilla::non_crypto::XorShift128PlusRNG prng(prngState1.valueOr(0), |
| 2532 | prngState2.valueOr(0)); |
| 2533 | if (mPRNG) { |
| 2534 | *mPRNG = prng; |
| 2535 | } else { |
| 2536 | void* backing = |
| 2537 | base_alloc(sizeof(mozilla::non_crypto::XorShift128PlusRNG)); |
| 2538 | mPRNG = new (backing) |
| 2539 | mozilla::non_crypto::XorShift128PlusRNG(std::move(prng)); |
| 2540 | } |
| 2541 | } |
| 2542 | mIsPRNGInitializing = false; |
| 2543 | } |
| 2544 | |
| 2545 | void* arena_t::MallocSmall(size_t aSize, bool aZero) { |
| 2546 | void* ret; |
| 2547 | arena_bin_t* bin; |
| 2548 | arena_run_t* run; |
| 2549 | SizeClass sizeClass(aSize); |
| 2550 | aSize = sizeClass.Size(); |
| 2551 | |
| 2552 | switch (sizeClass.Type()) { |
| 2553 | case SizeClass::Tiny: |
| 2554 | bin = &mBins[FloorLog2(aSize / kMinTinyClass)]; |
| 2555 | break; |
| 2556 | case SizeClass::Quantum: |
| 2557 | // Although we divide 2 things by kQuantum, the compiler will |
| 2558 | // reduce `kMinQuantumClass / kQuantum` and `kNumTinyClasses` to a |
| 2559 | // single constant. |
| 2560 | bin = &mBins[kNumTinyClasses + (aSize / kQuantum) - |
| 2561 | (kMinQuantumClass / kQuantum)]; |
| 2562 | break; |
| 2563 | case SizeClass::QuantumWide: |
| 2564 | bin = |
| 2565 | &mBins[kNumTinyClasses + kNumQuantumClasses + (aSize / kQuantumWide) - |
| 2566 | (kMinQuantumWideClass / kQuantumWide)]; |
| 2567 | break; |
| 2568 | case SizeClass::SubPage: |
| 2569 | bin = |
| 2570 | &mBins[kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + |
| 2571 | (FloorLog2(aSize) - LOG2(kMinSubPageClass)Log2<kMinSubPageClass>::value)]; |
| 2572 | break; |
| 2573 | default: |
| 2574 | MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unexpected size class type")do { do { static_assert( mozilla::detail::AssertionConditionType <decltype(false)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(false))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("false" " (" "MOZ_ASSERT_UNREACHABLE: " "Unexpected size class type" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2574); AnnotateMozCrashReason("MOZ_ASSERT" "(" "false" ") (" "MOZ_ASSERT_UNREACHABLE: " "Unexpected size class type" ")") ; do { MOZ_CrashSequence(__null, 2574); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); __builtin_unreachable (); } while (false); |
| 2575 | } |
| 2576 | MOZ_DIAGNOSTIC_ASSERT(aSize == bin->mSizeClass)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aSize == bin->mSizeClass)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aSize == bin->mSizeClass) )), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aSize == bin->mSizeClass" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2576); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "aSize == bin->mSizeClass" ")" ); do { MOZ_CrashSequence(__null, 2576); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2577 | |
| 2578 | size_t num_dirty_before, num_dirty_after; |
| 2579 | { |
| 2580 | MaybeMutexAutoLock lock(mLock); |
| 2581 | |
| 2582 | #ifdef MOZ_DEBUG1 |
| 2583 | bool isInitializingThread(false); |
| 2584 | #endif |
| 2585 | |
| 2586 | if (MOZ_UNLIKELY(mRandomizeSmallAllocations && mPRNG == nullptr &&(__builtin_expect(!!(mRandomizeSmallAllocations && mPRNG == nullptr && !mIsPRNGInitializing), 0)) |
| 2587 | !mIsPRNGInitializing)(__builtin_expect(!!(mRandomizeSmallAllocations && mPRNG == nullptr && !mIsPRNGInitializing), 0))) { |
| 2588 | #ifdef MOZ_DEBUG1 |
| 2589 | isInitializingThread = true; |
| 2590 | #endif |
| 2591 | InitPRNG(); |
| 2592 | } |
| 2593 | |
| 2594 | MOZ_ASSERT(!mRandomizeSmallAllocations || mPRNG ||do { static_assert( mozilla::detail::AssertionConditionType< decltype(!mRandomizeSmallAllocations || mPRNG || (mIsPRNGInitializing && !isInitializingThread))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!mRandomizeSmallAllocations || mPRNG || (mIsPRNGInitializing && !isInitializingThread )))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("!mRandomizeSmallAllocations || mPRNG || (mIsPRNGInitializing && !isInitializingThread)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2595); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "!mRandomizeSmallAllocations || mPRNG || (mIsPRNGInitializing && !isInitializingThread)" ")"); do { MOZ_CrashSequence(__null, 2595); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 2595 | (mIsPRNGInitializing && !isInitializingThread))do { static_assert( mozilla::detail::AssertionConditionType< decltype(!mRandomizeSmallAllocations || mPRNG || (mIsPRNGInitializing && !isInitializingThread))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!mRandomizeSmallAllocations || mPRNG || (mIsPRNGInitializing && !isInitializingThread )))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("!mRandomizeSmallAllocations || mPRNG || (mIsPRNGInitializing && !isInitializingThread)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2595); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "!mRandomizeSmallAllocations || mPRNG || (mIsPRNGInitializing && !isInitializingThread)" ")"); do { MOZ_CrashSequence(__null, 2595); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2596 | |
| 2597 | num_dirty_before = mNumDirty; |
| 2598 | run = GetNonFullBinRun(bin); |
| 2599 | num_dirty_after = mNumDirty; |
| 2600 | if (MOZ_UNLIKELY(!run)(__builtin_expect(!!(!run), 0))) { |
| 2601 | return nullptr; |
| 2602 | } |
| 2603 | MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run->mMagic == 0x384adf93)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run->mMagic == 0x384adf93 ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "run->mMagic == 0x384adf93", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2603); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "run->mMagic == 0x384adf93" ")"); do { MOZ_CrashSequence(__null, 2603); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2604 | MOZ_DIAGNOSTIC_ASSERT(run->mNumFree > 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run->mNumFree > 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run->mNumFree > 0))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("run->mNumFree > 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2604); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "run->mNumFree > 0" ")"); do { MOZ_CrashSequence(__null, 2604); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 2605 | ret = ArenaRunRegAlloc(run, bin); |
| 2606 | MOZ_DIAGNOSTIC_ASSERT(ret)do { static_assert( mozilla::detail::AssertionConditionType< decltype(ret)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(ret))), 0))) { do { } while (false ); MOZ_ReportAssertionFailure("ret", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2606); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "ret" ")"); do { MOZ_CrashSequence(__null, 2606); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2607 | run->mNumFree--; |
| 2608 | if (!ret) { |
| 2609 | return nullptr; |
| 2610 | } |
| 2611 | |
| 2612 | mStats.allocated_small += aSize; |
| 2613 | mStats.operations++; |
| 2614 | } |
| 2615 | if (num_dirty_after < num_dirty_before) { |
| 2616 | NotifySignificantReuse(); |
| 2617 | } |
| 2618 | if (!aZero) { |
| 2619 | ApplyZeroOrJunk(ret, aSize); |
| 2620 | } else { |
| 2621 | memset(ret, 0, aSize); |
| 2622 | } |
| 2623 | |
| 2624 | return ret; |
| 2625 | } |
| 2626 | |
| 2627 | void* arena_t::MallocLarge(size_t aSize, bool aZero) { |
| 2628 | void* ret; |
| 2629 | |
| 2630 | // Large allocation. |
| 2631 | aSize = PAGE_CEILING(aSize)(((aSize) + gPageSizeMask) & ~gPageSizeMask); |
| 2632 | |
| 2633 | size_t num_dirty_before, num_dirty_after; |
| 2634 | { |
| 2635 | MaybeMutexAutoLock lock(mLock); |
| 2636 | num_dirty_before = mNumDirty; |
| 2637 | ret = AllocRun(aSize, true, aZero); |
| 2638 | num_dirty_after = mNumDirty; |
| 2639 | if (!ret) { |
| 2640 | return nullptr; |
| 2641 | } |
| 2642 | mStats.allocated_large += aSize; |
| 2643 | mStats.operations++; |
| 2644 | } |
| 2645 | if (num_dirty_after < num_dirty_before) { |
| 2646 | NotifySignificantReuse(); |
| 2647 | } |
| 2648 | |
| 2649 | if (!aZero) { |
| 2650 | ApplyZeroOrJunk(ret, aSize); |
| 2651 | } |
| 2652 | |
| 2653 | return ret; |
| 2654 | } |
| 2655 | |
| 2656 | void* arena_t::Malloc(size_t aSize, bool aZero) { |
| 2657 | MOZ_DIAGNOSTIC_ASSERT(mMagic == ARENA_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mMagic == 0x947d3d24)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mMagic == 0x947d3d24))), 0)) ) { do { } while (false); MOZ_ReportAssertionFailure("mMagic == 0x947d3d24" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2657); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "mMagic == 0x947d3d24" ")"); do { MOZ_CrashSequence(__null, 2657); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 2658 | MOZ_ASSERT(aSize != 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aSize != 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aSize != 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aSize != 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2658); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aSize != 0" ")"); do { MOZ_CrashSequence(__null, 2658); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2659 | |
| 2660 | if (aSize <= gMaxBinClass(gMaxSubPageClass ? gMaxSubPageClass : kMaxQuantumWideClass)) { |
| 2661 | return MallocSmall(aSize, aZero); |
| 2662 | } |
| 2663 | if (aSize <= gMaxLargeClass) { |
| 2664 | return MallocLarge(aSize, aZero); |
| 2665 | } |
| 2666 | return MallocHuge(aSize, aZero); |
| 2667 | } |
| 2668 | |
| 2669 | // Only handles large allocations that require more than page alignment. |
| 2670 | void* arena_t::PallocLarge(size_t aAlignment, size_t aSize, size_t aAllocSize) { |
| 2671 | void* ret; |
| 2672 | size_t offset; |
| 2673 | arena_chunk_t* chunk; |
| 2674 | |
| 2675 | MOZ_ASSERT((aSize & gPageSizeMask) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((aSize & gPageSizeMask) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((aSize & gPageSizeMask) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(aSize & gPageSizeMask) == 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2675); AnnotateMozCrashReason("MOZ_ASSERT" "(" "(aSize & gPageSizeMask) == 0" ")"); do { MOZ_CrashSequence(__null, 2675); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2676 | MOZ_ASSERT((aAlignment & gPageSizeMask) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((aAlignment & gPageSizeMask) == 0)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(! !((aAlignment & gPageSizeMask) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(aAlignment & gPageSizeMask) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2676); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(aAlignment & gPageSizeMask) == 0" ")" ); do { MOZ_CrashSequence(__null, 2676); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2677 | |
| 2678 | size_t num_dirty_before, num_dirty_after; |
| 2679 | { |
| 2680 | MaybeMutexAutoLock lock(mLock); |
| 2681 | num_dirty_before = mNumDirty; |
| 2682 | ret = AllocRun(aAllocSize, true, false); |
| 2683 | if (!ret) { |
| 2684 | return nullptr; |
| 2685 | } |
| 2686 | |
| 2687 | chunk = GetChunkForPtr(ret); |
| 2688 | |
| 2689 | offset = uintptr_t(ret) & (aAlignment - 1); |
| 2690 | MOZ_ASSERT((offset & gPageSizeMask) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((offset & gPageSizeMask) == 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((offset & gPageSizeMask) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(offset & gPageSizeMask) == 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2690); AnnotateMozCrashReason("MOZ_ASSERT" "(" "(offset & gPageSizeMask) == 0" ")"); do { MOZ_CrashSequence(__null, 2690); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2691 | MOZ_ASSERT(offset < aAllocSize)do { static_assert( mozilla::detail::AssertionConditionType< decltype(offset < aAllocSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(offset < aAllocSize))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("offset < aAllocSize" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2691); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "offset < aAllocSize" ")"); do { MOZ_CrashSequence (__null, 2691); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2692 | if (offset == 0) { |
| 2693 | TrimRunTail(chunk, (arena_run_t*)ret, aAllocSize, aSize, false); |
| 2694 | } else { |
| 2695 | size_t leadsize, trailsize; |
| 2696 | |
| 2697 | leadsize = aAlignment - offset; |
| 2698 | if (leadsize > 0) { |
| 2699 | TrimRunHead(chunk, (arena_run_t*)ret, aAllocSize, |
| 2700 | aAllocSize - leadsize); |
| 2701 | ret = (void*)(uintptr_t(ret) + leadsize); |
| 2702 | } |
| 2703 | |
| 2704 | trailsize = aAllocSize - leadsize - aSize; |
| 2705 | if (trailsize != 0) { |
| 2706 | // Trim trailing space. |
| 2707 | MOZ_ASSERT(trailsize < aAllocSize)do { static_assert( mozilla::detail::AssertionConditionType< decltype(trailsize < aAllocSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(trailsize < aAllocSize))) , 0))) { do { } while (false); MOZ_ReportAssertionFailure("trailsize < aAllocSize" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2707); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "trailsize < aAllocSize" ")"); do { MOZ_CrashSequence (__null, 2707); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2708 | TrimRunTail(chunk, (arena_run_t*)ret, aSize + trailsize, aSize, false); |
| 2709 | } |
| 2710 | } |
| 2711 | num_dirty_after = mNumDirty; |
| 2712 | |
| 2713 | mStats.allocated_large += aSize; |
| 2714 | mStats.operations++; |
| 2715 | } |
| 2716 | if (num_dirty_after < num_dirty_before) { |
| 2717 | NotifySignificantReuse(); |
| 2718 | } |
| 2719 | // Note that since Bug 1488780we don't attempt purge dirty memory on this code |
| 2720 | // path. In general there won't be dirty memory above the threshold after an |
| 2721 | // allocation, only after free. The exception is if the dirty page threshold |
| 2722 | // has changed. |
| 2723 | |
| 2724 | ApplyZeroOrJunk(ret, aSize); |
| 2725 | return ret; |
| 2726 | } |
| 2727 | |
| 2728 | void* arena_t::Palloc(size_t aAlignment, size_t aSize) { |
| 2729 | void* ret; |
| 2730 | size_t ceil_size; |
| 2731 | |
| 2732 | // Round size up to the nearest multiple of alignment. |
| 2733 | // |
| 2734 | // This done, we can take advantage of the fact that for each small |
| 2735 | // size class, every object is aligned at the smallest power of two |
| 2736 | // that is non-zero in the base two representation of the size. For |
| 2737 | // example: |
| 2738 | // |
| 2739 | // Size | Base 2 | Minimum alignment |
| 2740 | // -----+----------+------------------ |
| 2741 | // 96 | 1100000 | 32 |
| 2742 | // 144 | 10100000 | 32 |
| 2743 | // 192 | 11000000 | 64 |
| 2744 | // |
| 2745 | // Depending on runtime settings, it is possible that arena_malloc() |
| 2746 | // will further round up to a power of two, but that never causes |
| 2747 | // correctness issues. |
| 2748 | ceil_size = ALIGNMENT_CEILING(aSize, aAlignment)(((aSize) + ((aAlignment) - 1)) & (~((aAlignment) - 1))); |
| 2749 | |
| 2750 | // (ceil_size < aSize) protects against the combination of maximal |
| 2751 | // alignment and size greater than maximal alignment. |
| 2752 | if (ceil_size < aSize) { |
| 2753 | // size_t overflow. |
| 2754 | return nullptr; |
| 2755 | } |
| 2756 | |
| 2757 | if (ceil_size <= gPageSize || |
| 2758 | (aAlignment <= gPageSize && ceil_size <= gMaxLargeClass)) { |
| 2759 | ret = Malloc(ceil_size, false); |
| 2760 | } else { |
| 2761 | size_t run_size; |
| 2762 | |
| 2763 | // We can't achieve sub-page alignment, so round up alignment |
| 2764 | // permanently; it makes later calculations simpler. |
| 2765 | aAlignment = PAGE_CEILING(aAlignment)(((aAlignment) + gPageSizeMask) & ~gPageSizeMask); |
| 2766 | ceil_size = PAGE_CEILING(aSize)(((aSize) + gPageSizeMask) & ~gPageSizeMask); |
| 2767 | |
| 2768 | // (ceil_size < aSize) protects against very large sizes within |
| 2769 | // pagesize of SIZE_T_MAX. |
| 2770 | // |
| 2771 | // (ceil_size + aAlignment < ceil_size) protects against the |
| 2772 | // combination of maximal alignment and ceil_size large enough |
| 2773 | // to cause overflow. This is similar to the first overflow |
| 2774 | // check above, but it needs to be repeated due to the new |
| 2775 | // ceil_size value, which may now be *equal* to maximal |
| 2776 | // alignment, whereas before we only detected overflow if the |
| 2777 | // original size was *greater* than maximal alignment. |
| 2778 | if (ceil_size < aSize || ceil_size + aAlignment < ceil_size) { |
| 2779 | // size_t overflow. |
| 2780 | return nullptr; |
| 2781 | } |
| 2782 | |
| 2783 | // Calculate the size of the over-size run that arena_palloc() |
| 2784 | // would need to allocate in order to guarantee the alignment. |
| 2785 | if (ceil_size >= aAlignment) { |
| 2786 | run_size = ceil_size + aAlignment - gPageSize; |
| 2787 | } else { |
| 2788 | // It is possible that (aAlignment << 1) will cause |
| 2789 | // overflow, but it doesn't matter because we also |
| 2790 | // subtract pagesize, which in the case of overflow |
| 2791 | // leaves us with a very large run_size. That causes |
| 2792 | // the first conditional below to fail, which means |
| 2793 | // that the bogus run_size value never gets used for |
| 2794 | // anything important. |
| 2795 | run_size = (aAlignment << 1) - gPageSize; |
| 2796 | } |
| 2797 | |
| 2798 | if (run_size <= gMaxLargeClass) { |
| 2799 | ret = PallocLarge(aAlignment, ceil_size, run_size); |
| 2800 | } else if (aAlignment <= kChunkSize) { |
| 2801 | ret = MallocHuge(ceil_size, false); |
| 2802 | } else { |
| 2803 | ret = PallocHuge(ceil_size, aAlignment, false); |
| 2804 | } |
| 2805 | } |
| 2806 | |
| 2807 | MOZ_ASSERT((uintptr_t(ret) & (aAlignment - 1)) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((uintptr_t(ret) & (aAlignment - 1)) == 0)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!((uintptr_t(ret) & (aAlignment - 1)) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(uintptr_t(ret) & (aAlignment - 1)) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2807); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(uintptr_t(ret) & (aAlignment - 1)) == 0" ")"); do { MOZ_CrashSequence(__null, 2807); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2808 | return ret; |
| 2809 | } |
| 2810 | |
| 2811 | class AllocInfo { |
| 2812 | public: |
| 2813 | template <bool Validate = false> |
| 2814 | static inline AllocInfo Get(const void* aPtr) { |
| 2815 | // If the allocator is not initialized, the pointer can't belong to it. |
| 2816 | if (Validate && !malloc_initialized) { |
| 2817 | return AllocInfo(); |
| 2818 | } |
| 2819 | |
| 2820 | auto chunk = GetChunkForPtr(aPtr); |
| 2821 | if (Validate) { |
| 2822 | if (!chunk || !gChunkRTree.Get(chunk)) { |
| 2823 | return AllocInfo(); |
| 2824 | } |
| 2825 | } |
| 2826 | |
| 2827 | if (chunk != aPtr) { |
| 2828 | MOZ_DIAGNOSTIC_ASSERT(chunk->arena->mMagic == ARENA_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(chunk->arena->mMagic == 0x947d3d24)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!(chunk->arena->mMagic == 0x947d3d24))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("chunk->arena->mMagic == 0x947d3d24" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2828); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "chunk->arena->mMagic == 0x947d3d24" ")"); do { MOZ_CrashSequence(__null, 2828); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2829 | size_t pageind = (((uintptr_t)aPtr - (uintptr_t)chunk) >> gPageSize2Pow); |
| 2830 | return GetInChunk(aPtr, chunk, pageind); |
| 2831 | } |
| 2832 | |
| 2833 | extent_node_t key; |
| 2834 | |
| 2835 | // Huge allocation |
| 2836 | key.mAddr = chunk; |
| 2837 | MutexAutoLock lock(huge_mtx); |
| 2838 | extent_node_t* node = huge.Search(&key); |
| 2839 | if (Validate && !node) { |
| 2840 | return AllocInfo(); |
| 2841 | } |
| 2842 | return AllocInfo(node->mSize, node); |
| 2843 | } |
| 2844 | |
| 2845 | // Get the allocation information for a pointer we know is within a chunk |
| 2846 | // (Small or large, not huge). |
| 2847 | static inline AllocInfo GetInChunk(const void* aPtr, arena_chunk_t* aChunk, |
| 2848 | size_t pageind) { |
| 2849 | size_t mapbits = aChunk->map[pageind].bits; |
| 2850 | MOZ_DIAGNOSTIC_ASSERT((mapbits & CHUNK_MAP_ALLOCATED) != 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((mapbits & ((size_t)0x01U)) != 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((mapbits & ((size_t)0x01U )) != 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("(mapbits & ((size_t)0x01U)) != 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2850); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "(mapbits & ((size_t)0x01U)) != 0" ")"); do { MOZ_CrashSequence(__null, 2850); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2851 | |
| 2852 | size_t size; |
| 2853 | if ((mapbits & CHUNK_MAP_LARGE((size_t)0x02U)) == 0) { |
| 2854 | arena_run_t* run = (arena_run_t*)(mapbits & ~gPageSizeMask); |
| 2855 | MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run->mMagic == 0x384adf93)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run->mMagic == 0x384adf93 ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "run->mMagic == 0x384adf93", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2855); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "run->mMagic == 0x384adf93" ")"); do { MOZ_CrashSequence(__null, 2855); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2856 | size = run->mBin->mSizeClass; |
| 2857 | } else { |
| 2858 | size = mapbits & ~gPageSizeMask; |
| 2859 | MOZ_DIAGNOSTIC_ASSERT(size != 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(size != 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(size != 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("size != 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2859); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "size != 0" ")"); do { MOZ_CrashSequence(__null, 2859); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2860 | } |
| 2861 | |
| 2862 | return AllocInfo(size, aChunk); |
| 2863 | } |
| 2864 | |
| 2865 | // Validate ptr before assuming that it points to an allocation. Currently, |
| 2866 | // the following validation is performed: |
| 2867 | // |
| 2868 | // + Check that ptr is not nullptr. |
| 2869 | // |
| 2870 | // + Check that ptr lies within a mapped chunk. |
| 2871 | static inline AllocInfo GetValidated(const void* aPtr) { |
| 2872 | return Get<true>(aPtr); |
| 2873 | } |
| 2874 | |
| 2875 | AllocInfo() : mSize(0), mChunk(nullptr) {} |
| 2876 | |
| 2877 | explicit AllocInfo(size_t aSize, arena_chunk_t* aChunk) |
| 2878 | : mSize(aSize), mChunk(aChunk) { |
| 2879 | MOZ_ASSERT(mSize <= gMaxLargeClass)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mSize <= gMaxLargeClass)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mSize <= gMaxLargeClass)) ), 0))) { do { } while (false); MOZ_ReportAssertionFailure("mSize <= gMaxLargeClass" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2879); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mSize <= gMaxLargeClass" ")"); do { MOZ_CrashSequence (__null, 2879); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2880 | } |
| 2881 | |
| 2882 | explicit AllocInfo(size_t aSize, extent_node_t* aNode) |
| 2883 | : mSize(aSize), mNode(aNode) { |
| 2884 | MOZ_ASSERT(mSize > gMaxLargeClass)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mSize > gMaxLargeClass)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mSize > gMaxLargeClass))) , 0))) { do { } while (false); MOZ_ReportAssertionFailure("mSize > gMaxLargeClass" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2884); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "mSize > gMaxLargeClass" ")"); do { MOZ_CrashSequence (__null, 2884); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 2885 | } |
| 2886 | |
| 2887 | size_t Size() { return mSize; } |
| 2888 | |
| 2889 | arena_t* Arena() { |
| 2890 | if (mSize <= gMaxLargeClass) { |
| 2891 | return mChunk->arena; |
| 2892 | } |
| 2893 | // Best effort detection that we're not trying to access an already |
| 2894 | // disposed arena. In the case of a disposed arena, the memory location |
| 2895 | // pointed by mNode->mArena is either free (but still a valid memory |
| 2896 | // region, per TypedBaseAlloc<arena_t>), in which case its id was reset, |
| 2897 | // or has been reallocated for a new region, and its id is very likely |
| 2898 | // different (per randomness). In both cases, the id is unlikely to |
| 2899 | // match what it was for the disposed arena. |
| 2900 | MOZ_RELEASE_ASSERT(mNode->mArenaId == mNode->mArena->mId)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mNode->mArenaId == mNode->mArena->mId)>:: isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(mNode->mArenaId == mNode->mArena->mId))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("mNode->mArenaId == mNode->mArena->mId" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2900); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "mNode->mArenaId == mNode->mArena->mId" ")"); do { MOZ_CrashSequence(__null, 2900); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2901 | return mNode->mArena; |
| 2902 | } |
| 2903 | |
| 2904 | bool IsValid() const { return !!mSize; } |
| 2905 | |
| 2906 | private: |
| 2907 | size_t mSize; |
| 2908 | union { |
| 2909 | // Pointer to the chunk associated with the allocation for small |
| 2910 | // and large allocations. |
| 2911 | arena_chunk_t* mChunk; |
| 2912 | |
| 2913 | // Pointer to the extent node for huge allocations. |
| 2914 | extent_node_t* mNode; |
| 2915 | }; |
| 2916 | }; |
| 2917 | |
| 2918 | inline void MozJemalloc::jemalloc_ptr_info(const void* aPtr, |
| 2919 | jemalloc_ptr_info_t* aInfo) { |
| 2920 | arena_chunk_t* chunk = GetChunkForPtr(aPtr); |
| 2921 | |
| 2922 | // Is the pointer null, or within one chunk's size of null? |
| 2923 | // Alternatively, if the allocator is not initialized yet, the pointer |
| 2924 | // can't be known. |
| 2925 | if (!chunk || !malloc_initialized) { |
| 2926 | *aInfo = {TagUnknown, nullptr, 0, 0}; |
| 2927 | return; |
| 2928 | } |
| 2929 | |
| 2930 | // Look for huge allocations before looking for |chunk| in gChunkRTree. |
| 2931 | // This is necessary because |chunk| won't be in gChunkRTree if it's |
| 2932 | // the second or subsequent chunk in a huge allocation. |
| 2933 | extent_node_t* node; |
| 2934 | extent_node_t key; |
| 2935 | { |
| 2936 | MutexAutoLock lock(huge_mtx); |
| 2937 | key.mAddr = const_cast<void*>(aPtr); |
| 2938 | node = |
| 2939 | reinterpret_cast<RedBlackTree<extent_node_t, ExtentTreeBoundsTrait>*>( |
| 2940 | &huge) |
| 2941 | ->Search(&key); |
| 2942 | if (node) { |
| 2943 | *aInfo = {TagLiveAlloc, node->mAddr, node->mSize, node->mArena->mId}; |
| 2944 | return; |
| 2945 | } |
| 2946 | } |
| 2947 | |
| 2948 | // It's not a huge allocation. Check if we have a known chunk. |
| 2949 | if (!gChunkRTree.Get(chunk)) { |
| 2950 | *aInfo = {TagUnknown, nullptr, 0, 0}; |
| 2951 | return; |
| 2952 | } |
| 2953 | |
| 2954 | MOZ_DIAGNOSTIC_ASSERT(chunk->arena->mMagic == ARENA_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(chunk->arena->mMagic == 0x947d3d24)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!(chunk->arena->mMagic == 0x947d3d24))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("chunk->arena->mMagic == 0x947d3d24" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 2954); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "chunk->arena->mMagic == 0x947d3d24" ")"); do { MOZ_CrashSequence(__null, 2954); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2955 | |
| 2956 | // Get the page number within the chunk. |
| 2957 | size_t pageind = (((uintptr_t)aPtr - (uintptr_t)chunk) >> gPageSize2Pow); |
| 2958 | if (pageind < gChunkHeaderNumPages) { |
| 2959 | // Within the chunk header. |
| 2960 | *aInfo = {TagUnknown, nullptr, 0, 0}; |
| 2961 | return; |
| 2962 | } |
| 2963 | |
| 2964 | size_t mapbits = chunk->map[pageind].bits; |
| 2965 | |
| 2966 | if (!(mapbits & CHUNK_MAP_ALLOCATED((size_t)0x01U))) { |
| 2967 | void* pageaddr = (void*)(uintptr_t(aPtr) & ~gPageSizeMask); |
| 2968 | *aInfo = {TagFreedPage, pageaddr, gPageSize, chunk->arena->mId}; |
| 2969 | return; |
| 2970 | } |
| 2971 | |
| 2972 | if (mapbits & CHUNK_MAP_LARGE((size_t)0x02U)) { |
| 2973 | // It's a large allocation. Only the first page of a large |
| 2974 | // allocation contains its size, so if the address is not in |
| 2975 | // the first page, scan back to find the allocation size. |
| 2976 | size_t size; |
| 2977 | while (true) { |
| 2978 | size = mapbits & ~gPageSizeMask; |
| 2979 | if (size != 0) { |
| 2980 | break; |
| 2981 | } |
| 2982 | |
| 2983 | // The following two return paths shouldn't occur in |
| 2984 | // practice unless there is heap corruption. |
| 2985 | pageind--; |
| 2986 | MOZ_DIAGNOSTIC_ASSERT(pageind >= gChunkHeaderNumPages)do { static_assert( mozilla::detail::AssertionConditionType< decltype(pageind >= gChunkHeaderNumPages)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(pageind >= gChunkHeaderNumPages ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "pageind >= gChunkHeaderNumPages", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2986); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "pageind >= gChunkHeaderNumPages" ")"); do { MOZ_CrashSequence(__null, 2986); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2987 | if (pageind < gChunkHeaderNumPages) { |
| 2988 | *aInfo = {TagUnknown, nullptr, 0, 0}; |
| 2989 | return; |
| 2990 | } |
| 2991 | |
| 2992 | mapbits = chunk->map[pageind].bits; |
| 2993 | MOZ_DIAGNOSTIC_ASSERT(mapbits & CHUNK_MAP_LARGE)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mapbits & ((size_t)0x02U))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mapbits & ((size_t)0x02U )))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("mapbits & ((size_t)0x02U)", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 2993); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "mapbits & ((size_t)0x02U)" ")"); do { MOZ_CrashSequence(__null, 2993); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 2994 | if (!(mapbits & CHUNK_MAP_LARGE((size_t)0x02U))) { |
| 2995 | *aInfo = {TagUnknown, nullptr, 0, 0}; |
| 2996 | return; |
| 2997 | } |
| 2998 | } |
| 2999 | |
| 3000 | void* addr = ((char*)chunk) + (pageind << gPageSize2Pow); |
| 3001 | *aInfo = {TagLiveAlloc, addr, size, chunk->arena->mId}; |
| 3002 | return; |
| 3003 | } |
| 3004 | |
| 3005 | // It must be a small allocation. |
| 3006 | auto run = (arena_run_t*)(mapbits & ~gPageSizeMask); |
| 3007 | MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run->mMagic == 0x384adf93)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run->mMagic == 0x384adf93 ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "run->mMagic == 0x384adf93", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3007); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "run->mMagic == 0x384adf93" ")"); do { MOZ_CrashSequence(__null, 3007); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3008 | |
| 3009 | // The allocation size is stored in the run metadata. |
| 3010 | size_t size = run->mBin->mSizeClass; |
| 3011 | |
| 3012 | // Address of the first possible pointer in the run after its headers. |
| 3013 | uintptr_t reg0_addr = (uintptr_t)run + run->mBin->mRunFirstRegionOffset; |
| 3014 | if (aPtr < (void*)reg0_addr) { |
| 3015 | // In the run header. |
| 3016 | *aInfo = {TagUnknown, nullptr, 0, 0}; |
| 3017 | return; |
| 3018 | } |
| 3019 | |
| 3020 | // Position in the run. |
| 3021 | unsigned regind = ((uintptr_t)aPtr - reg0_addr) / size; |
| 3022 | |
| 3023 | // Pointer to the allocation's base address. |
| 3024 | void* addr = (void*)(reg0_addr + regind * size); |
| 3025 | |
| 3026 | // Check if the allocation has been freed. |
| 3027 | unsigned elm = regind >> (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3); |
| 3028 | unsigned bit = regind - (elm << (LOG2(sizeof(int))Log2<sizeof(int)>::value + 3)); |
| 3029 | PtrInfoTag tag = |
| 3030 | ((run->mRegionsMask[elm] & (1U << bit))) ? TagFreedAlloc : TagLiveAlloc; |
| 3031 | |
| 3032 | *aInfo = {tag, addr, size, chunk->arena->mId}; |
| 3033 | } |
| 3034 | |
| 3035 | namespace Debug { |
| 3036 | // Helper for debuggers. We don't want it to be inlined and optimized out. |
| 3037 | MOZ_NEVER_INLINE__attribute__((noinline)) jemalloc_ptr_info_t* jemalloc_ptr_info(const void* aPtr) { |
| 3038 | static jemalloc_ptr_info_t info; |
| 3039 | MozJemalloc::jemalloc_ptr_info(aPtr, &info); |
| 3040 | return &info; |
| 3041 | } |
| 3042 | } // namespace Debug |
| 3043 | |
| 3044 | arena_chunk_t* arena_t::DallocSmall(arena_chunk_t* aChunk, void* aPtr, |
| 3045 | arena_chunk_map_t* aMapElm) { |
| 3046 | arena_run_t* run; |
| 3047 | arena_bin_t* bin; |
| 3048 | size_t size; |
| 3049 | |
| 3050 | run = (arena_run_t*)(aMapElm->bits & ~gPageSizeMask); |
| 3051 | MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run->mMagic == 0x384adf93)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run->mMagic == 0x384adf93 ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "run->mMagic == 0x384adf93", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3051); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "run->mMagic == 0x384adf93" ")"); do { MOZ_CrashSequence(__null, 3051); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3052 | bin = run->mBin; |
| 3053 | size = bin->mSizeClass; |
| 3054 | MOZ_DIAGNOSTIC_ASSERT(uintptr_t(aPtr) >=do { static_assert( mozilla::detail::AssertionConditionType< decltype(uintptr_t(aPtr) >= uintptr_t(run) + bin->mRunFirstRegionOffset )>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(uintptr_t(aPtr) >= uintptr_t(run) + bin->mRunFirstRegionOffset ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "uintptr_t(aPtr) >= uintptr_t(run) + bin->mRunFirstRegionOffset" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3055); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "uintptr_t(aPtr) >= uintptr_t(run) + bin->mRunFirstRegionOffset" ")"); do { MOZ_CrashSequence(__null, 3055); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 3055 | uintptr_t(run) + bin->mRunFirstRegionOffset)do { static_assert( mozilla::detail::AssertionConditionType< decltype(uintptr_t(aPtr) >= uintptr_t(run) + bin->mRunFirstRegionOffset )>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(uintptr_t(aPtr) >= uintptr_t(run) + bin->mRunFirstRegionOffset ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "uintptr_t(aPtr) >= uintptr_t(run) + bin->mRunFirstRegionOffset" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3055); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "uintptr_t(aPtr) >= uintptr_t(run) + bin->mRunFirstRegionOffset" ")"); do { MOZ_CrashSequence(__null, 3055); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3056 | |
| 3057 | arena_run_reg_dalloc(run, bin, aPtr, size); |
| 3058 | run->mNumFree++; |
| 3059 | arena_chunk_t* dealloc_chunk = nullptr; |
| 3060 | |
| 3061 | if (run->mNumFree == bin->mRunNumRegions) { |
| 3062 | // This run is entirely freed, remove it from our bin. |
| 3063 | #if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED1) |
| 3064 | run->mMagic = 0; |
| 3065 | #endif |
| 3066 | MOZ_ASSERT(bin->mNonFullRuns.ElementProbablyInList(run))do { static_assert( mozilla::detail::AssertionConditionType< decltype(bin->mNonFullRuns.ElementProbablyInList(run))> ::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(bin->mNonFullRuns.ElementProbablyInList(run)))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("bin->mNonFullRuns.ElementProbablyInList(run)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3066); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "bin->mNonFullRuns.ElementProbablyInList(run)" ")"); do { MOZ_CrashSequence(__null, 3066); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3067 | bin->mNonFullRuns.remove(run); |
| 3068 | dealloc_chunk = DallocRun(run, true); |
| 3069 | bin->mNumRuns--; |
| 3070 | } else if (run->mNumFree == 1) { |
| 3071 | // This is first slot we freed from this run, start tracking. |
| 3072 | MOZ_ASSERT(!bin->mNonFullRuns.ElementProbablyInList(run))do { static_assert( mozilla::detail::AssertionConditionType< decltype(!bin->mNonFullRuns.ElementProbablyInList(run))> ::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(!bin->mNonFullRuns.ElementProbablyInList(run)))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("!bin->mNonFullRuns.ElementProbablyInList(run)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3072); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "!bin->mNonFullRuns.ElementProbablyInList(run)" ")"); do { MOZ_CrashSequence(__null, 3072); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3073 | bin->mNonFullRuns.pushFront(run); |
| 3074 | } |
| 3075 | // else we just keep the run in mNonFullRuns where it is. |
| 3076 | // Note that we could move it to the head of the list here to get a strict |
| 3077 | // "most-recently-freed" order, but some of our benchmarks seem to be more |
| 3078 | // sensible to the increased overhead that this brings than to the order |
| 3079 | // supposedly slightly better for keeping CPU caches warm if we do. |
| 3080 | // In general we cannot foresee the future, so any order we choose might |
| 3081 | // perform different for different use cases and needs to be balanced with |
| 3082 | // the book-keeping overhead via measurements. |
| 3083 | |
| 3084 | mStats.allocated_small -= size; |
| 3085 | mStats.operations++; |
| 3086 | |
| 3087 | return dealloc_chunk; |
| 3088 | } |
| 3089 | |
| 3090 | arena_chunk_t* arena_t::DallocLarge(arena_chunk_t* aChunk, void* aPtr) { |
| 3091 | MOZ_DIAGNOSTIC_ASSERT((uintptr_t(aPtr) & gPageSizeMask) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype((uintptr_t(aPtr) & gPageSizeMask) == 0)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!((uintptr_t(aPtr) & gPageSizeMask) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(uintptr_t(aPtr) & gPageSizeMask) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3091); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "(uintptr_t(aPtr) & gPageSizeMask) == 0" ")"); do { MOZ_CrashSequence(__null, 3091); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3092 | size_t pageind = (uintptr_t(aPtr) - uintptr_t(aChunk)) >> gPageSize2Pow; |
| 3093 | size_t size = aChunk->map[pageind].bits & ~gPageSizeMask; |
| 3094 | |
| 3095 | mStats.allocated_large -= size; |
| 3096 | mStats.operations++; |
| 3097 | |
| 3098 | return DallocRun((arena_run_t*)aPtr, true); |
| 3099 | } |
| 3100 | |
| 3101 | static inline void arena_dalloc(void* aPtr, size_t aOffset, arena_t* aArena) { |
| 3102 | MOZ_ASSERT(aPtr)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aPtr)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(aPtr))), 0))) { do { } while (false ); MOZ_ReportAssertionFailure("aPtr", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3102); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aPtr" ")"); do { MOZ_CrashSequence(__null, 3102); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3103 | MOZ_ASSERT(aOffset != 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aOffset != 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aOffset != 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aOffset != 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3103); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aOffset != 0" ")"); do { MOZ_CrashSequence(__null, 3103); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3104 | MOZ_ASSERT(GetChunkOffsetForPtr(aPtr) == aOffset)do { static_assert( mozilla::detail::AssertionConditionType< decltype(GetChunkOffsetForPtr(aPtr) == aOffset)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(! !(GetChunkOffsetForPtr(aPtr) == aOffset))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("GetChunkOffsetForPtr(aPtr) == aOffset" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3104); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "GetChunkOffsetForPtr(aPtr) == aOffset" ")" ); do { MOZ_CrashSequence(__null, 3104); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3105 | |
| 3106 | auto chunk = (arena_chunk_t*)((uintptr_t)aPtr - aOffset); |
| 3107 | auto arena = chunk->arena; |
| 3108 | MOZ_ASSERT(arena)do { static_assert( mozilla::detail::AssertionConditionType< decltype(arena)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(arena))), 0))) { do { } while ( false); MOZ_ReportAssertionFailure("arena", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3108); AnnotateMozCrashReason("MOZ_ASSERT" "(" "arena" ")") ; do { MOZ_CrashSequence(__null, 3108); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3109 | MOZ_DIAGNOSTIC_ASSERT(arena->mMagic == ARENA_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(arena->mMagic == 0x947d3d24)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(arena->mMagic == 0x947d3d24 ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "arena->mMagic == 0x947d3d24", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3109); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "arena->mMagic == 0x947d3d24" ")"); do { MOZ_CrashSequence(__null, 3109); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3110 | MOZ_RELEASE_ASSERT(!aArena || arena == aArena)do { static_assert( mozilla::detail::AssertionConditionType< decltype(!aArena || arena == aArena)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!aArena || arena == aArena)) ), 0))) { do { } while (false); MOZ_ReportAssertionFailure("!aArena || arena == aArena" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3110); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "!aArena || arena == aArena" ")"); do { MOZ_CrashSequence(__null, 3110); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 3111 | |
| 3112 | size_t pageind = aOffset >> gPageSize2Pow; |
| 3113 | if (opt_poison) { |
| 3114 | AllocInfo info = AllocInfo::GetInChunk(aPtr, chunk, pageind); |
| 3115 | MOZ_ASSERT(info.IsValid())do { static_assert( mozilla::detail::AssertionConditionType< decltype(info.IsValid())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(info.IsValid()))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("info.IsValid()" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3115); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "info.IsValid()" ")"); do { MOZ_CrashSequence (__null, 3115); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3116 | MaybePoison(aPtr, info.Size()); |
| 3117 | } |
| 3118 | |
| 3119 | arena_chunk_t* chunk_dealloc_delay = nullptr; |
| 3120 | purge_action_t purge_action; |
| 3121 | { |
| 3122 | MOZ_DIAGNOSTIC_ASSERT(arena->mLock.SafeOnThisThread())do { static_assert( mozilla::detail::AssertionConditionType< decltype(arena->mLock.SafeOnThisThread())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(arena->mLock.SafeOnThisThread ()))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("arena->mLock.SafeOnThisThread()", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3122); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "arena->mLock.SafeOnThisThread()" ")"); do { MOZ_CrashSequence(__null, 3122); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3123 | MaybeMutexAutoLock lock(arena->mLock); |
| 3124 | arena_chunk_map_t* mapelm = &chunk->map[pageind]; |
| 3125 | MOZ_RELEASE_ASSERT(do { static_assert( mozilla::detail::AssertionConditionType< decltype((mapelm->bits & ((((size_t)0x80U) | ((size_t) 0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!((mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0" " (" "Freeing in a page with bad bits." ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3128); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "(mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0" ") (" "Freeing in a page with bad bits." ")"); do { MOZ_CrashSequence (__null, 3128); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false) |
| 3126 | (mapelm->bits &do { static_assert( mozilla::detail::AssertionConditionType< decltype((mapelm->bits & ((((size_t)0x80U) | ((size_t) 0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!((mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0" " (" "Freeing in a page with bad bits." ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3128); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "(mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0" ") (" "Freeing in a page with bad bits." ")"); do { MOZ_CrashSequence (__null, 3128); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false) |
| 3127 | (CHUNK_MAP_FRESH_MADVISED_OR_DECOMMITTED | CHUNK_MAP_ZEROED)) == 0,do { static_assert( mozilla::detail::AssertionConditionType< decltype((mapelm->bits & ((((size_t)0x80U) | ((size_t) 0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!((mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0" " (" "Freeing in a page with bad bits." ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3128); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "(mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0" ") (" "Freeing in a page with bad bits." ")"); do { MOZ_CrashSequence (__null, 3128); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false) |
| 3128 | "Freeing in a page with bad bits.")do { static_assert( mozilla::detail::AssertionConditionType< decltype((mapelm->bits & ((((size_t)0x80U) | ((size_t) 0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!((mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0" " (" "Freeing in a page with bad bits." ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3128); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "(mapelm->bits & ((((size_t)0x80U) | ((size_t)0x40U) | ((size_t)0x20U)) | ((size_t)0x04U))) == 0" ") (" "Freeing in a page with bad bits." ")"); do { MOZ_CrashSequence (__null, 3128); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3129 | MOZ_RELEASE_ASSERT((mapelm->bits & CHUNK_MAP_ALLOCATED) != 0,do { static_assert( mozilla::detail::AssertionConditionType< decltype((mapelm->bits & ((size_t)0x01U)) != 0)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!((mapelm->bits & ((size_t)0x01U)) != 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(mapelm->bits & ((size_t)0x01U)) != 0" " (" "Double-free?" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3130); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "(mapelm->bits & ((size_t)0x01U)) != 0" ") (" "Double-free?" ")"); do { MOZ_CrashSequence(__null, 3130 ); __attribute__((nomerge)) ::abort(); } while (false); } } while (false) |
| 3130 | "Double-free?")do { static_assert( mozilla::detail::AssertionConditionType< decltype((mapelm->bits & ((size_t)0x01U)) != 0)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!((mapelm->bits & ((size_t)0x01U)) != 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(mapelm->bits & ((size_t)0x01U)) != 0" " (" "Double-free?" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3130); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "(mapelm->bits & ((size_t)0x01U)) != 0" ") (" "Double-free?" ")"); do { MOZ_CrashSequence(__null, 3130 ); __attribute__((nomerge)) ::abort(); } while (false); } } while (false); |
| 3131 | if ((mapelm->bits & CHUNK_MAP_LARGE((size_t)0x02U)) == 0) { |
| 3132 | // Small allocation. |
| 3133 | chunk_dealloc_delay = arena->DallocSmall(chunk, aPtr, mapelm); |
| 3134 | } else { |
| 3135 | // Large allocation. |
| 3136 | chunk_dealloc_delay = arena->DallocLarge(chunk, aPtr); |
| 3137 | } |
| 3138 | |
| 3139 | purge_action = arena->ShouldStartPurge(); |
| 3140 | } |
| 3141 | |
| 3142 | if (chunk_dealloc_delay) { |
| 3143 | chunk_dealloc((void*)chunk_dealloc_delay, kChunkSize, ARENA_CHUNK); |
| 3144 | } |
| 3145 | |
| 3146 | arena->MayDoOrQueuePurge(purge_action, "arena_dalloc"); |
| 3147 | } |
| 3148 | |
| 3149 | static inline void idalloc(void* ptr, arena_t* aArena) { |
| 3150 | size_t offset; |
| 3151 | |
| 3152 | MOZ_ASSERT(ptr)do { static_assert( mozilla::detail::AssertionConditionType< decltype(ptr)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(ptr))), 0))) { do { } while (false ); MOZ_ReportAssertionFailure("ptr", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3152); AnnotateMozCrashReason("MOZ_ASSERT" "(" "ptr" ")"); do { MOZ_CrashSequence(__null, 3152); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 3153 | |
| 3154 | offset = GetChunkOffsetForPtr(ptr); |
| 3155 | if (offset != 0) { |
| 3156 | arena_dalloc(ptr, offset, aArena); |
| 3157 | } else { |
| 3158 | huge_dalloc(ptr, aArena); |
| 3159 | } |
| 3160 | } |
| 3161 | |
| 3162 | inline purge_action_t arena_t::ShouldStartPurge() { |
| 3163 | if (mNumDirty > mMaxDirty) { |
| 3164 | if (!mIsDeferredPurgeEnabled) { |
| 3165 | return purge_action_t::PurgeNow; |
| 3166 | } |
| 3167 | if (mIsPurgePending) { |
| 3168 | return purge_action_t::None; |
| 3169 | } |
| 3170 | mIsPurgePending = true; |
| 3171 | return purge_action_t::Queue; |
| 3172 | } |
| 3173 | return purge_action_t::None; |
| 3174 | } |
| 3175 | |
| 3176 | inline void arena_t::MayDoOrQueuePurge(purge_action_t aAction, |
| 3177 | const char* aCaller) { |
| 3178 | switch (aAction) { |
| 3179 | case purge_action_t::Queue: |
| 3180 | // Note that this thread committed earlier by setting |
| 3181 | // mIsDeferredPurgePending to add us to the list. There is a low |
| 3182 | // chance that in the meantime another thread ran Purge() and cleared |
| 3183 | // the flag, but that is fine, we'll adjust our bookkeeping when calling |
| 3184 | // ShouldStartPurge() or Purge() next time. |
| 3185 | gArenas.AddToOutstandingPurges(this); |
| 3186 | break; |
| 3187 | case purge_action_t::PurgeNow: { |
| 3188 | ArenaPurgeResult pr = PurgeLoop(PurgeIfThreshold, aCaller); |
| 3189 | // Arenas cannot die here because the caller is still using the arena, if |
| 3190 | // they did it'd be a use-after-free: the arena is destroyed but then used |
| 3191 | // afterwards. |
| 3192 | MOZ_RELEASE_ASSERT(pr != ArenaPurgeResult::Dying)do { static_assert( mozilla::detail::AssertionConditionType< decltype(pr != ArenaPurgeResult::Dying)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(pr != ArenaPurgeResult::Dying ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "pr != ArenaPurgeResult::Dying", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3192); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "pr != ArenaPurgeResult::Dying" ")"); do { MOZ_CrashSequence(__null, 3192); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3193 | break; |
| 3194 | } |
| 3195 | case purge_action_t::None: |
| 3196 | // do nothing. |
| 3197 | break; |
| 3198 | } |
| 3199 | } |
| 3200 | |
| 3201 | inline void arena_t::NotifySignificantReuse() { |
| 3202 | // Note that there is a chance here for a race between threads calling |
| 3203 | // GetTimeStampNS in a different order than writing it to the Atomic, |
| 3204 | // resulting in mLastSignificantReuseNS going potentially backwards. |
| 3205 | // Our use case is not sensitive to small deviations, the worse that can |
| 3206 | // happen is a slightly earlier purge. |
| 3207 | mLastSignificantReuseNS = GetTimestampNS(); |
| 3208 | } |
| 3209 | |
| 3210 | void arena_t::RallocShrinkLarge(arena_chunk_t* aChunk, void* aPtr, size_t aSize, |
| 3211 | size_t aOldSize) { |
| 3212 | MOZ_ASSERT(aSize < aOldSize)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aSize < aOldSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aSize < aOldSize))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aSize < aOldSize" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3212); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aSize < aOldSize" ")"); do { MOZ_CrashSequence (__null, 3212); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3213 | |
| 3214 | // Shrink the run, and make trailing pages available for other |
| 3215 | // allocations. |
| 3216 | purge_action_t purge_action; |
| 3217 | { |
| 3218 | MaybeMutexAutoLock lock(mLock); |
| 3219 | TrimRunTail(aChunk, (arena_run_t*)aPtr, aOldSize, aSize, true); |
| 3220 | mStats.allocated_large -= aOldSize - aSize; |
| 3221 | mStats.operations++; |
| 3222 | |
| 3223 | purge_action = ShouldStartPurge(); |
| 3224 | } |
| 3225 | MayDoOrQueuePurge(purge_action, "RallocShrinkLarge"); |
| 3226 | } |
| 3227 | |
| 3228 | // Returns whether reallocation was successful. |
| 3229 | bool arena_t::RallocGrowLarge(arena_chunk_t* aChunk, void* aPtr, size_t aSize, |
| 3230 | size_t aOldSize) { |
| 3231 | size_t pageind = (uintptr_t(aPtr) - uintptr_t(aChunk)) >> gPageSize2Pow; |
| 3232 | size_t npages = aOldSize >> gPageSize2Pow; |
| 3233 | |
| 3234 | size_t num_dirty_before, num_dirty_after; |
| 3235 | { |
| 3236 | MaybeMutexAutoLock lock(mLock); |
| 3237 | MOZ_DIAGNOSTIC_ASSERT(aOldSize ==do { static_assert( mozilla::detail::AssertionConditionType< decltype(aOldSize == (aChunk->map[pageind].bits & ~gPageSizeMask ))>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(aOldSize == (aChunk->map[pageind].bits & ~gPageSizeMask )))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("aOldSize == (aChunk->map[pageind].bits & ~gPageSizeMask)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3238); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "aOldSize == (aChunk->map[pageind].bits & ~gPageSizeMask)" ")"); do { MOZ_CrashSequence(__null, 3238); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 3238 | (aChunk->map[pageind].bits & ~gPageSizeMask))do { static_assert( mozilla::detail::AssertionConditionType< decltype(aOldSize == (aChunk->map[pageind].bits & ~gPageSizeMask ))>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(aOldSize == (aChunk->map[pageind].bits & ~gPageSizeMask )))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("aOldSize == (aChunk->map[pageind].bits & ~gPageSizeMask)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3238); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "aOldSize == (aChunk->map[pageind].bits & ~gPageSizeMask)" ")"); do { MOZ_CrashSequence(__null, 3238); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3239 | |
| 3240 | // Try to extend the run. |
| 3241 | MOZ_ASSERT(aSize > aOldSize)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aSize > aOldSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aSize > aOldSize))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aSize > aOldSize" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3241); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aSize > aOldSize" ")"); do { MOZ_CrashSequence (__null, 3241); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3242 | if (pageind + npages < gChunkNumPages - 1 && |
| 3243 | (aChunk->map[pageind + npages].bits & |
| 3244 | (CHUNK_MAP_ALLOCATED((size_t)0x01U) | CHUNK_MAP_BUSY((size_t)0x100U))) == 0 && |
| 3245 | (aChunk->map[pageind + npages].bits & ~gPageSizeMask) >= |
| 3246 | aSize - aOldSize) { |
| 3247 | num_dirty_before = mNumDirty; |
| 3248 | // The next run is available and sufficiently large. Split the |
| 3249 | // following run, then merge the first part with the existing |
| 3250 | // allocation. |
| 3251 | if (!SplitRun((arena_run_t*)(uintptr_t(aChunk) + |
| 3252 | ((pageind + npages) << gPageSize2Pow)), |
| 3253 | aSize - aOldSize, true, false)) { |
| 3254 | return false; |
| 3255 | } |
| 3256 | |
| 3257 | aChunk->map[pageind].bits = aSize | CHUNK_MAP_LARGE((size_t)0x02U) | CHUNK_MAP_ALLOCATED((size_t)0x01U); |
| 3258 | aChunk->map[pageind + npages].bits = |
| 3259 | CHUNK_MAP_LARGE((size_t)0x02U) | CHUNK_MAP_ALLOCATED((size_t)0x01U); |
| 3260 | |
| 3261 | mStats.allocated_large += aSize - aOldSize; |
| 3262 | mStats.operations++; |
| 3263 | num_dirty_after = mNumDirty; |
| 3264 | } else { |
| 3265 | return false; |
| 3266 | } |
| 3267 | } |
| 3268 | if (num_dirty_after < num_dirty_before) { |
| 3269 | NotifySignificantReuse(); |
| 3270 | } |
| 3271 | return true; |
| 3272 | } |
| 3273 | |
| 3274 | #ifdef XP_DARWIN |
| 3275 | # define VM_COPY_MIN kChunkSize |
| 3276 | static inline void pages_copy(void* dest, const void* src, size_t n) { |
| 3277 | MOZ_ASSERT((void*)((uintptr_t)dest & ~gPageSizeMask) == dest)do { static_assert( mozilla::detail::AssertionConditionType< decltype((void*)((uintptr_t)dest & ~gPageSizeMask) == dest )>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((void*)((uintptr_t)dest & ~gPageSizeMask) == dest ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "(void*)((uintptr_t)dest & ~gPageSizeMask) == dest", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3277); AnnotateMozCrashReason("MOZ_ASSERT" "(" "(void*)((uintptr_t)dest & ~gPageSizeMask) == dest" ")"); do { MOZ_CrashSequence(__null, 3277); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3278 | MOZ_ASSERT(n >= VM_COPY_MIN)do { static_assert( mozilla::detail::AssertionConditionType< decltype(n >= VM_COPY_MIN)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(n >= VM_COPY_MIN))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("n >= VM_COPY_MIN" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3278); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "n >= VM_COPY_MIN" ")"); do { MOZ_CrashSequence (__null, 3278); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3279 | MOZ_ASSERT((void*)((uintptr_t)src & ~gPageSizeMask) == src)do { static_assert( mozilla::detail::AssertionConditionType< decltype((void*)((uintptr_t)src & ~gPageSizeMask) == src) >::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!((void*)((uintptr_t)src & ~gPageSizeMask) == src) )), 0))) { do { } while (false); MOZ_ReportAssertionFailure("(void*)((uintptr_t)src & ~gPageSizeMask) == src" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3279); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "(void*)((uintptr_t)src & ~gPageSizeMask) == src" ")"); do { MOZ_CrashSequence(__null, 3279); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3280 | |
| 3281 | kern_return_t r = vm_copy(mach_task_self(), (vm_address_t)src, (vm_size_t)n, |
| 3282 | (vm_address_t)dest); |
| 3283 | if (r != KERN_SUCCESS) { |
| 3284 | MOZ_CRASH("vm_copy() failed")do { do { } while (false); MOZ_ReportCrash("" "vm_copy() failed" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3284); AnnotateMozCrashReason ("MOZ_CRASH(" "vm_copy() failed" ")"); do { MOZ_CrashSequence (__null, 3284); __attribute__((nomerge)) ::abort(); } while ( false); } while (false); |
| 3285 | } |
| 3286 | } |
| 3287 | #endif |
| 3288 | |
| 3289 | void* arena_t::RallocSmallOrLarge(void* aPtr, size_t aSize, size_t aOldSize) { |
| 3290 | void* ret; |
| 3291 | size_t copysize; |
| 3292 | SizeClass sizeClass(aSize); |
| 3293 | |
| 3294 | // Try to avoid moving the allocation. |
| 3295 | if (aOldSize <= gMaxLargeClass && sizeClass.Size() == aOldSize) { |
| 3296 | if (aSize < aOldSize) { |
| 3297 | MaybePoison((void*)(uintptr_t(aPtr) + aSize), aOldSize - aSize); |
| 3298 | } |
| 3299 | return aPtr; |
| 3300 | } |
| 3301 | if (sizeClass.Type() == SizeClass::Large && aOldSize > gMaxBinClass(gMaxSubPageClass ? gMaxSubPageClass : kMaxQuantumWideClass) && |
| 3302 | aOldSize <= gMaxLargeClass) { |
| 3303 | arena_chunk_t* chunk = GetChunkForPtr(aPtr); |
| 3304 | if (sizeClass.Size() < aOldSize) { |
| 3305 | // Fill before shrinking in order to avoid a race. |
| 3306 | MaybePoison((void*)((uintptr_t)aPtr + aSize), aOldSize - aSize); |
| 3307 | RallocShrinkLarge(chunk, aPtr, sizeClass.Size(), aOldSize); |
| 3308 | return aPtr; |
| 3309 | } |
| 3310 | if (RallocGrowLarge(chunk, aPtr, sizeClass.Size(), aOldSize)) { |
| 3311 | ApplyZeroOrJunk((void*)((uintptr_t)aPtr + aOldSize), aSize - aOldSize); |
| 3312 | return aPtr; |
| 3313 | } |
| 3314 | } |
| 3315 | |
| 3316 | // If we get here, then aSize and aOldSize are different enough that we |
| 3317 | // need to move the object or the run can't be expanded because the memory |
| 3318 | // after it is allocated or busy. In that case, fall back to allocating new |
| 3319 | // space and copying. Allow non-private arenas to switch arenas. |
| 3320 | ret = (mIsPrivate ? this : choose_arena(aSize))->Malloc(aSize, false); |
| 3321 | if (!ret) { |
| 3322 | return nullptr; |
| 3323 | } |
| 3324 | |
| 3325 | // Junk/zero-filling were already done by arena_t::Malloc(). |
| 3326 | copysize = (aSize < aOldSize) ? aSize : aOldSize; |
| 3327 | #ifdef VM_COPY_MIN |
| 3328 | if (copysize >= VM_COPY_MIN) { |
| 3329 | pages_copy(ret, aPtr, copysize); |
| 3330 | } else |
| 3331 | #endif |
| 3332 | { |
| 3333 | memcpy(ret, aPtr, copysize); |
| 3334 | } |
| 3335 | idalloc(aPtr, this); |
| 3336 | return ret; |
| 3337 | } |
| 3338 | |
| 3339 | void* arena_t::Ralloc(void* aPtr, size_t aSize, size_t aOldSize) { |
| 3340 | MOZ_DIAGNOSTIC_ASSERT(mMagic == ARENA_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mMagic == 0x947d3d24)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mMagic == 0x947d3d24))), 0)) ) { do { } while (false); MOZ_ReportAssertionFailure("mMagic == 0x947d3d24" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3340); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "mMagic == 0x947d3d24" ")"); do { MOZ_CrashSequence(__null, 3340); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 3341 | MOZ_ASSERT(aPtr)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aPtr)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(aPtr))), 0))) { do { } while (false ); MOZ_ReportAssertionFailure("aPtr", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3341); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aPtr" ")"); do { MOZ_CrashSequence(__null, 3341); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3342 | MOZ_ASSERT(aSize != 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aSize != 0)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aSize != 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aSize != 0", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3342); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aSize != 0" ")"); do { MOZ_CrashSequence(__null, 3342); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3343 | |
| 3344 | return (aSize <= gMaxLargeClass) ? RallocSmallOrLarge(aPtr, aSize, aOldSize) |
| 3345 | : RallocHuge(aPtr, aSize, aOldSize); |
| 3346 | } |
| 3347 | |
| 3348 | void* arena_t::operator new(size_t aCount, const fallible_t&) noexcept { |
| 3349 | MOZ_ASSERT(aCount == sizeof(arena_t))do { static_assert( mozilla::detail::AssertionConditionType< decltype(aCount == sizeof(arena_t))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aCount == sizeof(arena_t)))) , 0))) { do { } while (false); MOZ_ReportAssertionFailure("aCount == sizeof(arena_t)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3349); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aCount == sizeof(arena_t)" ")"); do { MOZ_CrashSequence (__null, 3349); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3350 | return TypedBaseAlloc<arena_t>::alloc(); |
| 3351 | } |
| 3352 | |
| 3353 | void arena_t::operator delete(void* aPtr) { |
| 3354 | TypedBaseAlloc<arena_t>::dealloc((arena_t*)aPtr); |
| 3355 | } |
| 3356 | |
| 3357 | arena_t::arena_t(arena_params_t* aParams, bool aIsPrivate) { |
| 3358 | unsigned i; |
| 3359 | |
| 3360 | memset(&mLink, 0, sizeof(mLink)); |
| 3361 | memset(&mStats, 0, sizeof(arena_stats_t)); |
| 3362 | mId = 0; |
| 3363 | |
| 3364 | // Initialize chunks. |
| 3365 | mChunksDirty.Init(); |
| 3366 | #ifdef MALLOC_DOUBLE_PURGE |
| 3367 | new (&mChunksMAdvised) DoublyLinkedList<arena_chunk_t>(); |
| 3368 | #endif |
| 3369 | mSpare = nullptr; |
| 3370 | |
| 3371 | mRandomizeSmallAllocations = opt_randomize_small; |
| 3372 | MaybeMutex::DoLock doLock = MaybeMutex::MUST_LOCK; |
| 3373 | if (aParams) { |
| 3374 | uint32_t randFlags = aParams->mFlags & ARENA_FLAG_RANDOMIZE_SMALL_MASK0x3; |
| 3375 | switch (randFlags) { |
| 3376 | case ARENA_FLAG_RANDOMIZE_SMALL_ENABLED1: |
| 3377 | mRandomizeSmallAllocations = true; |
| 3378 | break; |
| 3379 | case ARENA_FLAG_RANDOMIZE_SMALL_DISABLED2: |
| 3380 | mRandomizeSmallAllocations = false; |
| 3381 | break; |
| 3382 | case ARENA_FLAG_RANDOMIZE_SMALL_DEFAULT0: |
| 3383 | default: |
| 3384 | break; |
| 3385 | } |
| 3386 | |
| 3387 | uint32_t threadFlags = aParams->mFlags & ARENA_FLAG_THREAD_MASK0x4; |
| 3388 | if (threadFlags == ARENA_FLAG_THREAD_MAIN_THREAD_ONLY0x4) { |
| 3389 | // At the moment we require that any ARENA_FLAG_THREAD_MAIN_THREAD_ONLY |
| 3390 | // arenas are created and therefore always accessed by the main thread. |
| 3391 | // This is for two reasons: |
| 3392 | // * it allows jemalloc_stats to read their statistics (we also require |
| 3393 | // that jemalloc_stats is only used on the main thread). |
| 3394 | // * Only main-thread or threadsafe arenas can be guanteed to be in a |
| 3395 | // consistent state after a fork() from the main thread. If fork() |
| 3396 | // occurs off-thread then the new child process cannot use these arenas |
| 3397 | // (new children should usually exec() or exit() since other data may |
| 3398 | // also be inconsistent). |
| 3399 | MOZ_ASSERT(gArenas.IsOnMainThread())do { static_assert( mozilla::detail::AssertionConditionType< decltype(gArenas.IsOnMainThread())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(gArenas.IsOnMainThread()))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("gArenas.IsOnMainThread()" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3399); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "gArenas.IsOnMainThread()" ")"); do { MOZ_CrashSequence (__null, 3399); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3400 | MOZ_ASSERT(aIsPrivate)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aIsPrivate)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aIsPrivate))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aIsPrivate", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3400); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aIsPrivate" ")"); do { MOZ_CrashSequence(__null, 3400); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3401 | doLock = MaybeMutex::AVOID_LOCK_UNSAFE; |
| 3402 | } |
| 3403 | |
| 3404 | mMaxDirtyIncreaseOverride = aParams->mMaxDirtyIncreaseOverride; |
| 3405 | mMaxDirtyDecreaseOverride = aParams->mMaxDirtyDecreaseOverride; |
| 3406 | |
| 3407 | if (aParams->mLabel) { |
| 3408 | // The string may be truncated so always place a null-byte in the last |
| 3409 | // position. |
| 3410 | strncpy(mLabel, aParams->mLabel, LABEL_MAX_CAPACITY - 1); |
| 3411 | mLabel[LABEL_MAX_CAPACITY - 1] = 0; |
| 3412 | |
| 3413 | // If the string was trucated, then replace it's end with "..." |
| 3414 | if (strlen(aParams->mLabel) >= LABEL_MAX_CAPACITY) { |
| 3415 | for (int i = 0; i < 3; i++) { |
| 3416 | mLabel[LABEL_MAX_CAPACITY - 2 - i] = '.'; |
| 3417 | } |
| 3418 | } |
| 3419 | } else { |
| 3420 | mLabel[0] = 0; |
| 3421 | } |
| 3422 | } else { |
| 3423 | mMaxDirtyIncreaseOverride = 0; |
| 3424 | mMaxDirtyDecreaseOverride = 0; |
| 3425 | |
| 3426 | mLabel[0] = 0; |
| 3427 | } |
| 3428 | |
| 3429 | mLastSignificantReuseNS = GetTimestampNS(); |
| 3430 | mIsPurgePending = false; |
| 3431 | mIsDeferredPurgeEnabled = gArenas.IsDeferredPurgeEnabled(); |
| 3432 | |
| 3433 | MOZ_RELEASE_ASSERT(mLock.Init(doLock))do { static_assert( mozilla::detail::AssertionConditionType< decltype(mLock.Init(doLock))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mLock.Init(doLock)))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("mLock.Init(doLock)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3433); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "mLock.Init(doLock)" ")"); do { MOZ_CrashSequence (__null, 3433); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3434 | |
| 3435 | mPRNG = nullptr; |
| 3436 | mIsPRNGInitializing = false; |
| 3437 | |
| 3438 | mIsPrivate = aIsPrivate; |
| 3439 | |
| 3440 | mNumDirty = 0; |
| 3441 | mNumFresh = 0; |
| 3442 | mNumMAdvised = 0; |
| 3443 | // The default maximum amount of dirty pages allowed on arenas is a fraction |
| 3444 | // of opt_dirty_max. |
| 3445 | mMaxDirtyBase = (aParams && aParams->mMaxDirty) ? aParams->mMaxDirty |
| 3446 | : (opt_dirty_max / 8); |
| 3447 | UpdateMaxDirty(); |
| 3448 | |
| 3449 | mRunsAvail.Init(); |
| 3450 | |
| 3451 | // Initialize bins. |
| 3452 | SizeClass sizeClass(1); |
| 3453 | |
| 3454 | for (i = 0;; i++) { |
| 3455 | arena_bin_t& bin = mBins[i]; |
| 3456 | bin.Init(sizeClass); |
| 3457 | |
| 3458 | // SizeClass doesn't want sizes larger than gMaxBinClass for now. |
| 3459 | if (sizeClass.Size() == gMaxBinClass(gMaxSubPageClass ? gMaxSubPageClass : kMaxQuantumWideClass)) { |
| 3460 | break; |
| 3461 | } |
| 3462 | sizeClass = sizeClass.Next(); |
| 3463 | } |
| 3464 | MOZ_ASSERT(i == NUM_SMALL_CLASSES - 1)do { static_assert( mozilla::detail::AssertionConditionType< decltype(i == (kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + gNumSubPageClasses) - 1)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(i == (kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + gNumSubPageClasses) - 1))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("i == (kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + gNumSubPageClasses) - 1" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3464); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "i == (kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + gNumSubPageClasses) - 1" ")"); do { MOZ_CrashSequence(__null, 3464); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3465 | |
| 3466 | #if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED1) |
| 3467 | mMagic = ARENA_MAGIC0x947d3d24; |
| 3468 | #endif |
| 3469 | } |
| 3470 | |
| 3471 | arena_t::~arena_t() { |
| 3472 | size_t i; |
| 3473 | MaybeMutexAutoLock lock(mLock); |
| 3474 | |
| 3475 | MOZ_RELEASE_ASSERT(!mLink.Left() && !mLink.Right(),do { static_assert( mozilla::detail::AssertionConditionType< decltype(!mLink.Left() && !mLink.Right())>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!(!mLink.Left() && !mLink.Right()))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("!mLink.Left() && !mLink.Right()" " (" "Arena is still registered" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3476); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "!mLink.Left() && !mLink.Right()" ") (" "Arena is still registered" ")"); do { MOZ_CrashSequence (__null, 3476); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false) |
| 3476 | "Arena is still registered")do { static_assert( mozilla::detail::AssertionConditionType< decltype(!mLink.Left() && !mLink.Right())>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!(!mLink.Left() && !mLink.Right()))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("!mLink.Left() && !mLink.Right()" " (" "Arena is still registered" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3476); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "!mLink.Left() && !mLink.Right()" ") (" "Arena is still registered" ")"); do { MOZ_CrashSequence (__null, 3476); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3477 | MOZ_RELEASE_ASSERT(!mStats.allocated_small && !mStats.allocated_large,do { static_assert( mozilla::detail::AssertionConditionType< decltype(!mStats.allocated_small && !mStats.allocated_large )>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(!mStats.allocated_small && !mStats.allocated_large ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "!mStats.allocated_small && !mStats.allocated_large" " (" "Arena is not empty" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3478); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "!mStats.allocated_small && !mStats.allocated_large" ") (" "Arena is not empty" ")"); do { MOZ_CrashSequence(__null , 3478); __attribute__((nomerge)) ::abort(); } while (false); } } while (false) |
| 3478 | "Arena is not empty")do { static_assert( mozilla::detail::AssertionConditionType< decltype(!mStats.allocated_small && !mStats.allocated_large )>::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(!mStats.allocated_small && !mStats.allocated_large ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "!mStats.allocated_small && !mStats.allocated_large" " (" "Arena is not empty" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3478); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "!mStats.allocated_small && !mStats.allocated_large" ") (" "Arena is not empty" ")"); do { MOZ_CrashSequence(__null , 3478); __attribute__((nomerge)) ::abort(); } while (false); } } while (false); |
| 3479 | if (mSpare) { |
| 3480 | chunk_dealloc(mSpare, kChunkSize, ARENA_CHUNK); |
| 3481 | } |
| 3482 | for (i = 0; i < NUM_SMALL_CLASSES(kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + gNumSubPageClasses); i++) { |
| 3483 | MOZ_RELEASE_ASSERT(mBins[i].mNonFullRuns.isEmpty(), "Bin is not empty")do { static_assert( mozilla::detail::AssertionConditionType< decltype(mBins[i].mNonFullRuns.isEmpty())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mBins[i].mNonFullRuns.isEmpty ()))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("mBins[i].mNonFullRuns.isEmpty()" " (" "Bin is not empty" ")" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3483); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "mBins[i].mNonFullRuns.isEmpty()" ") (" "Bin is not empty" ")"); do { MOZ_CrashSequence(__null, 3483 ); __attribute__((nomerge)) ::abort(); } while (false); } } while (false); |
| 3484 | } |
| 3485 | #ifdef MOZ_DEBUG1 |
| 3486 | { |
| 3487 | MutexAutoLock lock(huge_mtx); |
| 3488 | // This is an expensive check, so we only do it on debug builds. |
| 3489 | for (auto node : huge.iter()) { |
| 3490 | MOZ_RELEASE_ASSERT(node->mArenaId != mId, "Arena has huge allocations")do { static_assert( mozilla::detail::AssertionConditionType< decltype(node->mArenaId != mId)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(node->mArenaId != mId))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("node->mArenaId != mId" " (" "Arena has huge allocations" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3490); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "node->mArenaId != mId" ") (" "Arena has huge allocations" ")"); do { MOZ_CrashSequence (__null, 3490); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3491 | } |
| 3492 | } |
| 3493 | #endif |
| 3494 | mId = 0; |
| 3495 | } |
| 3496 | |
| 3497 | arena_t* ArenaCollection::CreateArena(bool aIsPrivate, |
| 3498 | arena_params_t* aParams) { |
| 3499 | arena_t* ret = new (fallible) arena_t(aParams, aIsPrivate); |
| 3500 | if (!ret) { |
| 3501 | // Only reached if there is an OOM error. |
| 3502 | |
| 3503 | // OOM here is quite inconvenient to propagate, since dealing with it |
| 3504 | // would require a check for failure in the fast path. Instead, punt |
| 3505 | // by using the first arena. |
| 3506 | // In practice, this is an extremely unlikely failure. |
| 3507 | _malloc_message(_getprogname(), ": (malloc) Error initializing arena\n"); |
| 3508 | |
| 3509 | return mDefaultArena; |
| 3510 | } |
| 3511 | |
| 3512 | MutexAutoLock lock(mLock); |
| 3513 | |
| 3514 | // For public arenas, it's fine to just use incrementing arena id |
| 3515 | if (!aIsPrivate) { |
| 3516 | ret->mId = mLastPublicArenaId++; |
| 3517 | mArenas.Insert(ret); |
| 3518 | return ret; |
| 3519 | } |
| 3520 | |
| 3521 | #ifdef NON_RANDOM_ARENA_IDS1 |
| 3522 | // For private arenas, slightly obfuscate the id by XORing a key generated |
| 3523 | // once, and rotate the bits by an amount also generated once. |
| 3524 | if (mArenaIdKey == 0) { |
| 3525 | mozilla::Maybe<uint64_t> maybeRandom = mozilla::RandomUint64(); |
| 3526 | MOZ_RELEASE_ASSERT(maybeRandom.isSome())do { static_assert( mozilla::detail::AssertionConditionType< decltype(maybeRandom.isSome())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(maybeRandom.isSome()))), 0)) ) { do { } while (false); MOZ_ReportAssertionFailure("maybeRandom.isSome()" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3526); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "maybeRandom.isSome()" ")"); do { MOZ_CrashSequence (__null, 3526); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3527 | mArenaIdKey = maybeRandom.value(); |
| 3528 | maybeRandom = mozilla::RandomUint64(); |
| 3529 | MOZ_RELEASE_ASSERT(maybeRandom.isSome())do { static_assert( mozilla::detail::AssertionConditionType< decltype(maybeRandom.isSome())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(maybeRandom.isSome()))), 0)) ) { do { } while (false); MOZ_ReportAssertionFailure("maybeRandom.isSome()" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3529); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "maybeRandom.isSome()" ")"); do { MOZ_CrashSequence (__null, 3529); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3530 | mArenaIdRotation = maybeRandom.value() & (sizeof(void*) * 8 - 1); |
| 3531 | } |
| 3532 | arena_id_t id = reinterpret_cast<arena_id_t>(ret) ^ mArenaIdKey; |
| 3533 | ret->mId = |
| 3534 | (id >> mArenaIdRotation) | (id << (sizeof(void*) * 8 - mArenaIdRotation)); |
| 3535 | mPrivateArenas.Insert(ret); |
| 3536 | return ret; |
| 3537 | #else |
| 3538 | // For private arenas, generate a cryptographically-secure random id for the |
| 3539 | // new arena. If an attacker manages to get control of the process, this |
| 3540 | // should make it more difficult for them to "guess" the ID of a memory |
| 3541 | // arena, stopping them from getting data they may want |
| 3542 | Tree& tree = (ret->IsMainThreadOnly()) ? mMainThreadArenas : mPrivateArenas; |
| 3543 | arena_id_t arena_id; |
| 3544 | do { |
| 3545 | arena_id = MakeRandArenaId(ret->IsMainThreadOnly()); |
| 3546 | // Keep looping until we ensure that the random number we just generated |
| 3547 | // isn't already in use by another active arena |
| 3548 | } while (GetByIdInternal(tree, arena_id)); |
| 3549 | |
| 3550 | ret->mId = arena_id; |
| 3551 | tree.Insert(ret); |
| 3552 | return ret; |
| 3553 | #endif |
| 3554 | } |
| 3555 | |
| 3556 | #ifndef NON_RANDOM_ARENA_IDS1 |
| 3557 | arena_id_t ArenaCollection::MakeRandArenaId(bool aIsMainThreadOnly) const { |
| 3558 | uint64_t rand; |
| 3559 | do { |
| 3560 | mozilla::Maybe<uint64_t> maybeRandomId = mozilla::RandomUint64(); |
| 3561 | MOZ_RELEASE_ASSERT(maybeRandomId.isSome())do { static_assert( mozilla::detail::AssertionConditionType< decltype(maybeRandomId.isSome())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(maybeRandomId.isSome()))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("maybeRandomId.isSome()" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3561); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "maybeRandomId.isSome()" ")"); do { MOZ_CrashSequence(__null, 3561); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 3562 | |
| 3563 | rand = maybeRandomId.value(); |
| 3564 | |
| 3565 | // Set or clear the least significant bit depending on if this is a |
| 3566 | // main-thread-only arena. We use this in GetById. |
| 3567 | if (aIsMainThreadOnly) { |
| 3568 | rand = rand | MAIN_THREAD_ARENA_BIT; |
| 3569 | } else { |
| 3570 | rand = rand & ~MAIN_THREAD_ARENA_BIT; |
| 3571 | } |
| 3572 | |
| 3573 | // Avoid 0 as an arena Id. We use 0 for disposed arenas. |
| 3574 | } while (rand == 0); |
| 3575 | |
| 3576 | return arena_id_t(rand); |
| 3577 | } |
| 3578 | #endif |
| 3579 | |
| 3580 | // End arena. |
| 3581 | // *************************************************************************** |
| 3582 | // Begin general internal functions. |
| 3583 | |
| 3584 | // Initialize huge allocation data. |
| 3585 | static void huge_init() MOZ_REQUIRES(gInitLock)__attribute__((exclusive_locks_required(gInitLock))) { |
| 3586 | huge_mtx.Init(); |
| 3587 | MOZ_PUSH_IGNORE_THREAD_SAFETYGCC diagnostic push
GCC diagnostic ignored "-Wthread-safety" |
| 3588 | huge.Init(); |
| 3589 | huge_allocated = 0; |
| 3590 | huge_mapped = 0; |
| 3591 | huge_operations = 0; |
| 3592 | MOZ_POP_THREAD_SAFETYGCC diagnostic pop |
| 3593 | } |
| 3594 | |
| 3595 | void* arena_t::MallocHuge(size_t aSize, bool aZero) { |
| 3596 | return PallocHuge(aSize, kChunkSize, aZero); |
| 3597 | } |
| 3598 | |
| 3599 | void* arena_t::PallocHuge(size_t aSize, size_t aAlignment, bool aZero) { |
| 3600 | void* ret; |
| 3601 | size_t csize; |
| 3602 | size_t psize; |
| 3603 | extent_node_t* node; |
| 3604 | |
| 3605 | // We're going to configure guard pages in the region between the |
| 3606 | // page-aligned size and the chunk-aligned size, so if those are the same |
| 3607 | // then we need to force that region into existence. |
| 3608 | csize = CHUNK_CEILING(aSize + gPageSize)(((aSize + gPageSize) + kChunkSizeMask) & ~kChunkSizeMask ); |
| 3609 | if (csize < aSize) { |
| 3610 | // size is large enough to cause size_t wrap-around. |
| 3611 | return nullptr; |
| 3612 | } |
| 3613 | |
| 3614 | // Allocate an extent node with which to track the chunk. |
| 3615 | node = ExtentAlloc::alloc(); |
| 3616 | if (!node) { |
| 3617 | return nullptr; |
| 3618 | } |
| 3619 | |
| 3620 | // Allocate one or more contiguous chunks for this request. |
| 3621 | ret = chunk_alloc(csize, aAlignment, false); |
| 3622 | if (!ret) { |
| 3623 | ExtentAlloc::dealloc(node); |
| 3624 | return nullptr; |
| 3625 | } |
| 3626 | psize = PAGE_CEILING(aSize)(((aSize) + gPageSizeMask) & ~gPageSizeMask); |
| 3627 | #ifdef MOZ_DEBUG1 |
| 3628 | if (aZero) { |
| 3629 | chunk_assert_zero(ret, psize); |
| 3630 | } |
| 3631 | #endif |
| 3632 | |
| 3633 | // Insert node into huge. |
| 3634 | node->mAddr = ret; |
| 3635 | node->mSize = psize; |
| 3636 | node->mArena = this; |
| 3637 | node->mArenaId = mId; |
| 3638 | |
| 3639 | { |
| 3640 | MutexAutoLock lock(huge_mtx); |
| 3641 | huge.Insert(node); |
| 3642 | |
| 3643 | // Although we allocated space for csize bytes, we indicate that we've |
| 3644 | // allocated only psize bytes. |
| 3645 | // |
| 3646 | // If DECOMMIT is defined, this is a reasonable thing to do, since |
| 3647 | // we'll explicitly decommit the bytes in excess of psize. |
| 3648 | // |
| 3649 | // If DECOMMIT is not defined, then we're relying on the OS to be lazy |
| 3650 | // about how it allocates physical pages to mappings. If we never |
| 3651 | // touch the pages in excess of psize, the OS won't allocate a physical |
| 3652 | // page, and we won't use more than psize bytes of physical memory. |
| 3653 | // |
| 3654 | // A correct program will only touch memory in excess of how much it |
| 3655 | // requested if it first calls malloc_usable_size and finds out how |
| 3656 | // much space it has to play with. But because we set node->mSize = |
| 3657 | // psize above, malloc_usable_size will return psize, not csize, and |
| 3658 | // the program will (hopefully) never touch bytes in excess of psize. |
| 3659 | // Thus those bytes won't take up space in physical memory, and we can |
| 3660 | // reasonably claim we never "allocated" them in the first place. |
| 3661 | huge_allocated += psize; |
| 3662 | huge_mapped += csize; |
| 3663 | huge_operations++; |
| 3664 | } |
| 3665 | |
| 3666 | pages_decommit((void*)((uintptr_t)ret + psize), csize - psize); |
| 3667 | |
| 3668 | if (!aZero) { |
| 3669 | ApplyZeroOrJunk(ret, psize); |
| 3670 | } |
| 3671 | |
| 3672 | return ret; |
| 3673 | } |
| 3674 | |
| 3675 | void* arena_t::RallocHuge(void* aPtr, size_t aSize, size_t aOldSize) { |
| 3676 | void* ret; |
| 3677 | size_t copysize; |
| 3678 | |
| 3679 | // Avoid moving the allocation if the size class would not change. |
| 3680 | if (aOldSize > gMaxLargeClass && |
| 3681 | CHUNK_CEILING(aSize + gPageSize)(((aSize + gPageSize) + kChunkSizeMask) & ~kChunkSizeMask ) == CHUNK_CEILING(aOldSize + gPageSize)(((aOldSize + gPageSize) + kChunkSizeMask) & ~kChunkSizeMask )) { |
| 3682 | size_t psize = PAGE_CEILING(aSize)(((aSize) + gPageSizeMask) & ~gPageSizeMask); |
| 3683 | if (aSize < aOldSize) { |
| 3684 | MaybePoison((void*)((uintptr_t)aPtr + aSize), aOldSize - aSize); |
| 3685 | } |
| 3686 | if (psize < aOldSize) { |
| 3687 | extent_node_t key; |
| 3688 | |
| 3689 | pages_decommit((void*)((uintptr_t)aPtr + psize), aOldSize - psize); |
| 3690 | |
| 3691 | // Update recorded size. |
| 3692 | MutexAutoLock lock(huge_mtx); |
| 3693 | key.mAddr = const_cast<void*>(aPtr); |
| 3694 | extent_node_t* node = huge.Search(&key); |
| 3695 | MOZ_ASSERT(node)do { static_assert( mozilla::detail::AssertionConditionType< decltype(node)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(node))), 0))) { do { } while (false ); MOZ_ReportAssertionFailure("node", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3695); AnnotateMozCrashReason("MOZ_ASSERT" "(" "node" ")"); do { MOZ_CrashSequence(__null, 3695); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3696 | MOZ_ASSERT(node->mSize == aOldSize)do { static_assert( mozilla::detail::AssertionConditionType< decltype(node->mSize == aOldSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(node->mSize == aOldSize)) ), 0))) { do { } while (false); MOZ_ReportAssertionFailure("node->mSize == aOldSize" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3696); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "node->mSize == aOldSize" ")"); do { MOZ_CrashSequence (__null, 3696); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3697 | MOZ_RELEASE_ASSERT(node->mArena == this)do { static_assert( mozilla::detail::AssertionConditionType< decltype(node->mArena == this)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(node->mArena == this))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("node->mArena == this" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3697); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "node->mArena == this" ")"); do { MOZ_CrashSequence(__null, 3697); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 3698 | huge_allocated -= aOldSize - psize; |
| 3699 | huge_operations++; |
| 3700 | // No need to change huge_mapped, because we didn't (un)map anything. |
| 3701 | node->mSize = psize; |
| 3702 | } else if (psize > aOldSize) { |
| 3703 | if (!pages_commit((void*)((uintptr_t)aPtr + aOldSize), |
| 3704 | psize - aOldSize)) { |
| 3705 | return nullptr; |
| 3706 | } |
| 3707 | |
| 3708 | // We need to update the recorded size if the size increased, |
| 3709 | // so malloc_usable_size doesn't return a value smaller than |
| 3710 | // what was requested via realloc(). |
| 3711 | extent_node_t key; |
| 3712 | MutexAutoLock lock(huge_mtx); |
| 3713 | key.mAddr = const_cast<void*>(aPtr); |
| 3714 | extent_node_t* node = huge.Search(&key); |
| 3715 | MOZ_ASSERT(node)do { static_assert( mozilla::detail::AssertionConditionType< decltype(node)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(node))), 0))) { do { } while (false ); MOZ_ReportAssertionFailure("node", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3715); AnnotateMozCrashReason("MOZ_ASSERT" "(" "node" ")"); do { MOZ_CrashSequence(__null, 3715); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3716 | MOZ_ASSERT(node->mSize == aOldSize)do { static_assert( mozilla::detail::AssertionConditionType< decltype(node->mSize == aOldSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(node->mSize == aOldSize)) ), 0))) { do { } while (false); MOZ_ReportAssertionFailure("node->mSize == aOldSize" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3716); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "node->mSize == aOldSize" ")"); do { MOZ_CrashSequence (__null, 3716); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3717 | MOZ_RELEASE_ASSERT(node->mArena == this)do { static_assert( mozilla::detail::AssertionConditionType< decltype(node->mArena == this)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(node->mArena == this))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("node->mArena == this" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3717); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "node->mArena == this" ")"); do { MOZ_CrashSequence(__null, 3717); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 3718 | huge_allocated += psize - aOldSize; |
| 3719 | huge_operations++; |
| 3720 | // No need to change huge_mapped, because we didn't |
| 3721 | // (un)map anything. |
| 3722 | node->mSize = psize; |
| 3723 | } |
| 3724 | |
| 3725 | if (aSize > aOldSize) { |
| 3726 | ApplyZeroOrJunk((void*)((uintptr_t)aPtr + aOldSize), aSize - aOldSize); |
| 3727 | } |
| 3728 | return aPtr; |
| 3729 | } |
| 3730 | |
| 3731 | // If we get here, then aSize and aOldSize are different enough that we |
| 3732 | // need to use a different size class. In that case, fall back to allocating |
| 3733 | // new space and copying. Allow non-private arenas to switch arenas. |
| 3734 | ret = (mIsPrivate ? this : choose_arena(aSize))->MallocHuge(aSize, false); |
| 3735 | if (!ret) { |
| 3736 | return nullptr; |
| 3737 | } |
| 3738 | |
| 3739 | copysize = (aSize < aOldSize) ? aSize : aOldSize; |
| 3740 | #ifdef VM_COPY_MIN |
| 3741 | if (copysize >= VM_COPY_MIN) { |
| 3742 | pages_copy(ret, aPtr, copysize); |
| 3743 | } else |
| 3744 | #endif |
| 3745 | { |
| 3746 | memcpy(ret, aPtr, copysize); |
| 3747 | } |
| 3748 | idalloc(aPtr, this); |
| 3749 | return ret; |
| 3750 | } |
| 3751 | |
| 3752 | static void huge_dalloc(void* aPtr, arena_t* aArena) { |
| 3753 | extent_node_t* node; |
| 3754 | size_t mapped = 0; |
| 3755 | { |
| 3756 | extent_node_t key; |
| 3757 | MutexAutoLock lock(huge_mtx); |
| 3758 | |
| 3759 | // Extract from tree of huge allocations. |
| 3760 | key.mAddr = aPtr; |
| 3761 | node = huge.Search(&key); |
| 3762 | MOZ_RELEASE_ASSERT(node, "Double-free?")do { static_assert( mozilla::detail::AssertionConditionType< decltype(node)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(node))), 0))) { do { } while (false ); MOZ_ReportAssertionFailure("node" " (" "Double-free?" ")", "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3762); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "node" ") (" "Double-free?" ")"); do { MOZ_CrashSequence(__null, 3762); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 3763 | MOZ_ASSERT(node->mAddr == aPtr)do { static_assert( mozilla::detail::AssertionConditionType< decltype(node->mAddr == aPtr)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(node->mAddr == aPtr))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("node->mAddr == aPtr" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3763); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "node->mAddr == aPtr" ")"); do { MOZ_CrashSequence (__null, 3763); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3764 | MOZ_RELEASE_ASSERT(!aArena || node->mArena == aArena)do { static_assert( mozilla::detail::AssertionConditionType< decltype(!aArena || node->mArena == aArena)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!aArena || node->mArena == aArena))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("!aArena || node->mArena == aArena", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3764); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "!aArena || node->mArena == aArena" ")"); do { MOZ_CrashSequence(__null, 3764); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3765 | // See AllocInfo::Arena. |
| 3766 | MOZ_RELEASE_ASSERT(node->mArenaId == node->mArena->mId)do { static_assert( mozilla::detail::AssertionConditionType< decltype(node->mArenaId == node->mArena->mId)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!(node->mArenaId == node->mArena->mId))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("node->mArenaId == node->mArena->mId" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3766); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "node->mArenaId == node->mArena->mId" ")"); do { MOZ_CrashSequence(__null, 3766); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3767 | huge.Remove(node); |
| 3768 | |
| 3769 | mapped = CHUNK_CEILING(node->mSize + gPageSize)(((node->mSize + gPageSize) + kChunkSizeMask) & ~kChunkSizeMask ); |
| 3770 | huge_allocated -= node->mSize; |
| 3771 | huge_mapped -= mapped; |
| 3772 | huge_operations++; |
| 3773 | } |
| 3774 | |
| 3775 | // Unmap chunk. |
| 3776 | chunk_dealloc(node->mAddr, mapped, HUGE_CHUNK); |
| 3777 | |
| 3778 | ExtentAlloc::dealloc(node); |
| 3779 | } |
| 3780 | |
| 3781 | // Returns whether the allocator was successfully initialized. |
| 3782 | static bool malloc_init_hard() { |
| 3783 | unsigned i; |
| 3784 | const char* opts; |
| 3785 | |
| 3786 | AutoLock<StaticMutex> lock(gInitLock); |
| 3787 | |
| 3788 | if (malloc_initialized) { |
| 3789 | // Another thread initialized the allocator before this one |
| 3790 | // acquired gInitLock. |
| 3791 | return true; |
| 3792 | } |
| 3793 | |
| 3794 | if (!thread_arena.init()) { |
| 3795 | return true; |
| 3796 | } |
| 3797 | |
| 3798 | // Get page size and number of CPUs |
| 3799 | const size_t page_size = GetKernelPageSize(); |
| 3800 | // We assume that the page size is a power of 2. |
| 3801 | MOZ_ASSERT(IsPowerOfTwo(page_size))do { static_assert( mozilla::detail::AssertionConditionType< decltype(IsPowerOfTwo(page_size))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(IsPowerOfTwo(page_size)))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("IsPowerOfTwo(page_size)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3801); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "IsPowerOfTwo(page_size)" ")"); do { MOZ_CrashSequence (__null, 3801); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3802 | #ifdef MALLOC_STATIC_PAGESIZE |
| 3803 | if (gPageSize % page_size) { |
| 3804 | _malloc_message( |
| 3805 | _getprogname(), |
| 3806 | "Compile-time page size does not divide the runtime one.\n"); |
| 3807 | MOZ_CRASH()do { do { } while (false); MOZ_ReportCrash("" , "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3807); AnnotateMozCrashReason("MOZ_CRASH(" ")"); do { MOZ_CrashSequence (__null, 3807); __attribute__((nomerge)) ::abort(); } while ( false); } while (false); |
| 3808 | } |
| 3809 | #else |
| 3810 | gRealPageSize = gPageSize = page_size; |
| 3811 | #endif |
| 3812 | |
| 3813 | // Get runtime configuration. |
| 3814 | if ((opts = getenv("MALLOC_OPTIONS"))) { |
| 3815 | for (i = 0; opts[i] != '\0'; i++) { |
| 3816 | // All options are single letters, some take a *prefix* numeric argument. |
| 3817 | |
| 3818 | // Parse the argument. |
| 3819 | unsigned prefix_arg = 0; |
| 3820 | while (opts[i] >= '0' && opts[i] <= '9') { |
| 3821 | prefix_arg *= 10; |
| 3822 | prefix_arg += opts[i] - '0'; |
| 3823 | i++; |
| 3824 | } |
| 3825 | |
| 3826 | switch (opts[i]) { |
| 3827 | case 'f': |
| 3828 | opt_dirty_max >>= prefix_arg ? prefix_arg : 1; |
| 3829 | break; |
| 3830 | case 'F': |
| 3831 | prefix_arg = prefix_arg ? prefix_arg : 1; |
| 3832 | if (opt_dirty_max == 0) { |
| 3833 | opt_dirty_max = 1; |
| 3834 | prefix_arg--; |
| 3835 | } |
| 3836 | opt_dirty_max <<= prefix_arg; |
| 3837 | if (opt_dirty_max == 0) { |
| 3838 | // If the shift above overflowed all the bits then clamp the result |
| 3839 | // instead. If we started with DIRTY_MAX_DEFAULT then this will |
| 3840 | // always be a power of two so choose the maximum power of two that |
| 3841 | // fits in a size_t. |
| 3842 | opt_dirty_max = size_t(1) << (sizeof(size_t) * CHAR_BIT8 - 1); |
| 3843 | } |
| 3844 | break; |
| 3845 | #ifdef MALLOC_RUNTIME_CONFIG |
| 3846 | case 'j': |
| 3847 | opt_junk = false; |
| 3848 | break; |
| 3849 | case 'J': |
| 3850 | opt_junk = true; |
| 3851 | break; |
| 3852 | case 'q': |
| 3853 | // The argument selects how much poisoning to do. |
| 3854 | opt_poison = NONE; |
| 3855 | break; |
| 3856 | case 'Q': |
| 3857 | if (opts[i + 1] == 'Q') { |
| 3858 | // Maximum poisoning. |
| 3859 | i++; |
| 3860 | opt_poison = ALL; |
| 3861 | } else { |
| 3862 | opt_poison = SOME; |
| 3863 | opt_poison_size = kCacheLineSize * prefix_arg; |
| 3864 | } |
| 3865 | break; |
| 3866 | case 'z': |
| 3867 | opt_zero = false; |
| 3868 | break; |
| 3869 | case 'Z': |
| 3870 | opt_zero = true; |
| 3871 | break; |
| 3872 | # ifndef MALLOC_STATIC_PAGESIZE |
| 3873 | case 'P': |
| 3874 | MOZ_ASSERT(gPageSize >= 4_KiB)do { static_assert( mozilla::detail::AssertionConditionType< decltype(gPageSize >= 4_KiB)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(gPageSize >= 4_KiB))), 0) )) { do { } while (false); MOZ_ReportAssertionFailure("gPageSize >= 4_KiB" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3874); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "gPageSize >= 4_KiB" ")"); do { MOZ_CrashSequence (__null, 3874); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3875 | MOZ_ASSERT(gPageSize <= 64_KiB)do { static_assert( mozilla::detail::AssertionConditionType< decltype(gPageSize <= 64_KiB)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(gPageSize <= 64_KiB))), 0 ))) { do { } while (false); MOZ_ReportAssertionFailure("gPageSize <= 64_KiB" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3875); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "gPageSize <= 64_KiB" ")"); do { MOZ_CrashSequence (__null, 3875); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 3876 | prefix_arg = prefix_arg ? prefix_arg : 1; |
| 3877 | gPageSize <<= prefix_arg; |
| 3878 | // We know that if the shift causes gPageSize to be zero then it's |
| 3879 | // because it shifted all the bits off. We didn't start with zero. |
| 3880 | // Therefore if gPageSize is out of bounds we set it to 64KiB. |
| 3881 | if (gPageSize < 4_KiB || gPageSize > 64_KiB) { |
| 3882 | gPageSize = 64_KiB; |
| 3883 | } |
| 3884 | break; |
| 3885 | # endif |
| 3886 | #endif |
| 3887 | case 'r': |
| 3888 | opt_randomize_small = false; |
| 3889 | break; |
| 3890 | case 'R': |
| 3891 | opt_randomize_small = true; |
| 3892 | break; |
| 3893 | default: { |
| 3894 | char cbuf[2]; |
| 3895 | |
| 3896 | cbuf[0] = opts[i]; |
| 3897 | cbuf[1] = '\0'; |
| 3898 | _malloc_message(_getprogname(), |
| 3899 | ": (malloc) Unsupported character " |
| 3900 | "in malloc options: '", |
| 3901 | cbuf, "'\n"); |
| 3902 | } |
| 3903 | } |
| 3904 | } |
| 3905 | } |
| 3906 | |
| 3907 | #ifndef MALLOC_STATIC_PAGESIZE |
| 3908 | DefineGlobals(); |
| 3909 | #endif |
| 3910 | gRecycledSize = 0; |
| 3911 | |
| 3912 | chunks_init(); |
| 3913 | huge_init(); |
| 3914 | base_init(); |
| 3915 | |
| 3916 | // Initialize arenas collection here. |
| 3917 | if (!gArenas.Init()) { |
| 3918 | return false; |
| 3919 | } |
| 3920 | |
| 3921 | // Assign the default arena to the initial thread. |
| 3922 | thread_arena.set(gArenas.GetDefault()); |
| 3923 | |
| 3924 | if (!gChunkRTree.Init()) { |
| 3925 | return false; |
| 3926 | } |
| 3927 | |
| 3928 | malloc_initialized = true; |
| 3929 | |
| 3930 | // Dummy call so that the function is not removed by dead-code elimination |
| 3931 | Debug::jemalloc_ptr_info(nullptr); |
| 3932 | |
| 3933 | #if !defined(XP_WIN) && !defined(XP_DARWIN) |
| 3934 | // Prevent potential deadlock on malloc locks after fork. |
| 3935 | pthread_atfork(_malloc_prefork, _malloc_postfork_parent, |
| 3936 | _malloc_postfork_child); |
| 3937 | #endif |
| 3938 | |
| 3939 | return true; |
| 3940 | } |
| 3941 | |
| 3942 | // End general internal functions. |
| 3943 | // *************************************************************************** |
| 3944 | // Begin malloc(3)-compatible functions. |
| 3945 | |
| 3946 | // The BaseAllocator class is a helper class that implements the base allocator |
| 3947 | // functions (malloc, calloc, realloc, free, memalign) for a given arena, |
| 3948 | // or an appropriately chosen arena (per choose_arena()) when none is given. |
| 3949 | struct BaseAllocator { |
| 3950 | #define MALLOC_DECL(name, return_type, ...) \ |
| 3951 | inline return_type name(__VA_ARGS__); |
| 3952 | |
| 3953 | #define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE1 |
| 3954 | #include "malloc_decls.h" |
| 3955 | |
| 3956 | explicit BaseAllocator(arena_t* aArena) : mArena(aArena) {} |
| 3957 | |
| 3958 | private: |
| 3959 | arena_t* mArena; |
| 3960 | }; |
| 3961 | |
| 3962 | #define MALLOC_DECL(name, return_type, ...) \ |
| 3963 | inline return_type MozJemalloc::name( \ |
| 3964 | ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)##__VA_ARGS__ arg1) { \ |
| 3965 | BaseAllocator allocator(nullptr); \ |
| 3966 | return allocator.name(ARGS_HELPER(ARGS, ##__VA_ARGS__)arg1); \ |
| 3967 | } |
| 3968 | #define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE1 |
| 3969 | #include "malloc_decls.h" |
| 3970 | |
| 3971 | inline void* BaseAllocator::malloc(size_t aSize) { |
| 3972 | void* ret; |
| 3973 | arena_t* arena; |
| 3974 | |
| 3975 | if (!malloc_init()) { |
| 3976 | ret = nullptr; |
| 3977 | goto RETURN; |
| 3978 | } |
| 3979 | |
| 3980 | if (aSize == 0) { |
| 3981 | aSize = 1; |
| 3982 | } |
| 3983 | // If mArena is non-null, it must not be in the first page. |
| 3984 | MOZ_DIAGNOSTIC_ASSERT_IF(mArena, (size_t)mArena >= gPageSize)do { if (mArena) { do { static_assert( mozilla::detail::AssertionConditionType <decltype((size_t)mArena >= gPageSize)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!((size_t)mArena >= gPageSize ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "(size_t)mArena >= gPageSize", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 3984); AnnotateMozCrashReason("MOZ_DIAGNOSTIC_ASSERT" "(" "(size_t)mArena >= gPageSize" ")"); do { MOZ_CrashSequence(__null, 3984); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); } } while ( false); |
| 3985 | arena = mArena ? mArena : choose_arena(aSize); |
| 3986 | ret = arena->Malloc(aSize, /* aZero = */ false); |
| 3987 | |
| 3988 | RETURN: |
| 3989 | if (!ret) { |
| 3990 | errno(*__errno_location ()) = ENOMEM12; |
| 3991 | } |
| 3992 | |
| 3993 | return ret; |
| 3994 | } |
| 3995 | |
| 3996 | inline void* BaseAllocator::memalign(size_t aAlignment, size_t aSize) { |
| 3997 | MOZ_ASSERT(((aAlignment - 1) & aAlignment) == 0)do { static_assert( mozilla::detail::AssertionConditionType< decltype(((aAlignment - 1) & aAlignment) == 0)>::isValid , "invalid assertion condition"); if ((__builtin_expect(!!(!( !!(((aAlignment - 1) & aAlignment) == 0))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("((aAlignment - 1) & aAlignment) == 0" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 3997); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "((aAlignment - 1) & aAlignment) == 0" ")" ); do { MOZ_CrashSequence(__null, 3997); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 3998 | |
| 3999 | if (!malloc_init()) { |
| 4000 | return nullptr; |
| 4001 | } |
| 4002 | |
| 4003 | if (aSize == 0) { |
| 4004 | aSize = 1; |
| 4005 | } |
| 4006 | |
| 4007 | aAlignment = aAlignment < sizeof(void*) ? sizeof(void*) : aAlignment; |
| 4008 | arena_t* arena = mArena ? mArena : choose_arena(aSize); |
| 4009 | return arena->Palloc(aAlignment, aSize); |
| 4010 | } |
| 4011 | |
| 4012 | inline void* BaseAllocator::calloc(size_t aNum, size_t aSize) { |
| 4013 | void* ret; |
| 4014 | |
| 4015 | if (malloc_init()) { |
| 4016 | CheckedInt<size_t> checkedSize = CheckedInt<size_t>(aNum) * aSize; |
| 4017 | if (checkedSize.isValid()) { |
| 4018 | size_t allocSize = checkedSize.value(); |
| 4019 | if (allocSize == 0) { |
| 4020 | allocSize = 1; |
| 4021 | } |
| 4022 | arena_t* arena = mArena ? mArena : choose_arena(allocSize); |
| 4023 | ret = arena->Malloc(allocSize, /* aZero = */ true); |
| 4024 | } else { |
| 4025 | ret = nullptr; |
| 4026 | } |
| 4027 | } else { |
| 4028 | ret = nullptr; |
| 4029 | } |
| 4030 | |
| 4031 | if (!ret) { |
| 4032 | errno(*__errno_location ()) = ENOMEM12; |
| 4033 | } |
| 4034 | |
| 4035 | return ret; |
| 4036 | } |
| 4037 | |
| 4038 | inline void* BaseAllocator::realloc(void* aPtr, size_t aSize) { |
| 4039 | void* ret; |
| 4040 | |
| 4041 | if (aSize == 0) { |
| 4042 | aSize = 1; |
| 4043 | } |
| 4044 | |
| 4045 | if (aPtr) { |
| 4046 | MOZ_RELEASE_ASSERT(malloc_initialized)do { static_assert( mozilla::detail::AssertionConditionType< decltype(malloc_initialized)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(malloc_initialized))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("malloc_initialized" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4046); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "malloc_initialized" ")"); do { MOZ_CrashSequence (__null, 4046); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 4047 | |
| 4048 | auto info = AllocInfo::Get(aPtr); |
| 4049 | auto arena = info.Arena(); |
| 4050 | MOZ_RELEASE_ASSERT(!mArena || arena == mArena)do { static_assert( mozilla::detail::AssertionConditionType< decltype(!mArena || arena == mArena)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!mArena || arena == mArena)) ), 0))) { do { } while (false); MOZ_ReportAssertionFailure("!mArena || arena == mArena" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4050); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "!mArena || arena == mArena" ")"); do { MOZ_CrashSequence(__null, 4050); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 4051 | ret = arena->Ralloc(aPtr, aSize, info.Size()); |
| 4052 | } else { |
| 4053 | if (!malloc_init()) { |
| 4054 | ret = nullptr; |
| 4055 | } else { |
| 4056 | arena_t* arena = mArena ? mArena : choose_arena(aSize); |
| 4057 | ret = arena->Malloc(aSize, /* aZero = */ false); |
| 4058 | } |
| 4059 | } |
| 4060 | |
| 4061 | if (!ret) { |
| 4062 | errno(*__errno_location ()) = ENOMEM12; |
| 4063 | } |
| 4064 | return ret; |
| 4065 | } |
| 4066 | |
| 4067 | inline void BaseAllocator::free(void* aPtr) { |
| 4068 | size_t offset; |
| 4069 | |
| 4070 | // A version of idalloc that checks for nullptr pointer. |
| 4071 | offset = GetChunkOffsetForPtr(aPtr); |
| 4072 | if (offset != 0) { |
| 4073 | MOZ_RELEASE_ASSERT(malloc_initialized)do { static_assert( mozilla::detail::AssertionConditionType< decltype(malloc_initialized)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(malloc_initialized))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("malloc_initialized" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4073); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "malloc_initialized" ")"); do { MOZ_CrashSequence (__null, 4073); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 4074 | arena_dalloc(aPtr, offset, mArena); |
| 4075 | } else if (aPtr) { |
| 4076 | MOZ_RELEASE_ASSERT(malloc_initialized)do { static_assert( mozilla::detail::AssertionConditionType< decltype(malloc_initialized)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(malloc_initialized))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("malloc_initialized" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4076); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "malloc_initialized" ")"); do { MOZ_CrashSequence (__null, 4076); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 4077 | huge_dalloc(aPtr, mArena); |
| 4078 | } |
| 4079 | } |
| 4080 | |
| 4081 | inline int MozJemalloc::posix_memalign(void** aMemPtr, size_t aAlignment, |
| 4082 | size_t aSize) { |
| 4083 | return AlignedAllocator<memalign>::posix_memalign(aMemPtr, aAlignment, aSize); |
| 4084 | } |
| 4085 | |
| 4086 | inline void* MozJemalloc::aligned_alloc(size_t aAlignment, size_t aSize) { |
| 4087 | return AlignedAllocator<memalign>::aligned_alloc(aAlignment, aSize); |
| 4088 | } |
| 4089 | |
| 4090 | inline void* MozJemalloc::valloc(size_t aSize) { |
| 4091 | return AlignedAllocator<memalign>::valloc(aSize); |
| 4092 | } |
| 4093 | |
| 4094 | // End malloc(3)-compatible functions. |
| 4095 | // *************************************************************************** |
| 4096 | // Begin non-standard functions. |
| 4097 | |
| 4098 | // This was added by Mozilla for use by SQLite. |
| 4099 | inline size_t MozJemalloc::malloc_good_size(size_t aSize) { |
| 4100 | if (aSize <= gMaxLargeClass) { |
| 4101 | // Small or large |
| 4102 | aSize = SizeClass(aSize).Size(); |
| 4103 | } else { |
| 4104 | // Huge. We use PAGE_CEILING to get psize, instead of using |
| 4105 | // CHUNK_CEILING to get csize. This ensures that this |
| 4106 | // malloc_usable_size(malloc(n)) always matches |
| 4107 | // malloc_good_size(n). |
| 4108 | aSize = PAGE_CEILING(aSize)(((aSize) + gPageSizeMask) & ~gPageSizeMask); |
| 4109 | } |
| 4110 | return aSize; |
| 4111 | } |
| 4112 | |
| 4113 | inline size_t MozJemalloc::malloc_usable_size(usable_ptr_t aPtr) { |
| 4114 | return AllocInfo::GetValidated(aPtr).Size(); |
| 4115 | } |
| 4116 | |
| 4117 | inline void MozJemalloc::jemalloc_stats_internal( |
| 4118 | jemalloc_stats_t* aStats, jemalloc_bin_stats_t* aBinStats) { |
| 4119 | size_t non_arena_mapped, chunk_header_size; |
| 4120 | |
| 4121 | if (!aStats) { |
| 4122 | return; |
| 4123 | } |
| 4124 | if (!malloc_init()) { |
| 4125 | memset(aStats, 0, sizeof(*aStats)); |
| 4126 | return; |
| 4127 | } |
| 4128 | if (aBinStats) { |
| 4129 | memset(aBinStats, 0, sizeof(jemalloc_bin_stats_t) * NUM_SMALL_CLASSES(kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + gNumSubPageClasses)); |
| 4130 | } |
| 4131 | |
| 4132 | // Gather runtime settings. |
| 4133 | aStats->opt_junk = opt_junk; |
| 4134 | aStats->opt_randomize_small = opt_randomize_small; |
| 4135 | aStats->opt_zero = opt_zero; |
| 4136 | aStats->quantum = kQuantum; |
| 4137 | aStats->quantum_max = kMaxQuantumClass; |
| 4138 | aStats->quantum_wide = kQuantumWide; |
| 4139 | aStats->quantum_wide_max = kMaxQuantumWideClass; |
| 4140 | aStats->subpage_max = gMaxSubPageClass; |
| 4141 | aStats->large_max = gMaxLargeClass; |
| 4142 | aStats->chunksize = kChunkSize; |
| 4143 | aStats->page_size = gPageSize; |
| 4144 | aStats->dirty_max = opt_dirty_max; |
| 4145 | |
| 4146 | // Gather current memory usage statistics. |
| 4147 | aStats->narenas = 0; |
| 4148 | aStats->mapped = 0; |
| 4149 | aStats->allocated = 0; |
| 4150 | aStats->waste = 0; |
| 4151 | aStats->pages_dirty = 0; |
| 4152 | aStats->pages_fresh = 0; |
| 4153 | aStats->pages_madvised = 0; |
| 4154 | aStats->bookkeeping = 0; |
| 4155 | aStats->bin_unused = 0; |
| 4156 | |
| 4157 | non_arena_mapped = 0; |
| 4158 | |
| 4159 | // Get huge mapped/allocated. |
| 4160 | { |
| 4161 | MutexAutoLock lock(huge_mtx); |
| 4162 | non_arena_mapped += huge_mapped; |
| 4163 | aStats->allocated += huge_allocated; |
| 4164 | aStats->num_operations += huge_operations; |
| 4165 | MOZ_ASSERT(huge_mapped >= huge_allocated)do { static_assert( mozilla::detail::AssertionConditionType< decltype(huge_mapped >= huge_allocated)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(huge_mapped >= huge_allocated ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "huge_mapped >= huge_allocated", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4165); AnnotateMozCrashReason("MOZ_ASSERT" "(" "huge_mapped >= huge_allocated" ")"); do { MOZ_CrashSequence(__null, 4165); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4166 | } |
| 4167 | |
| 4168 | // Get base mapped/allocated. |
| 4169 | { |
| 4170 | MutexAutoLock lock(base_mtx); |
| 4171 | non_arena_mapped += base_mapped; |
| 4172 | aStats->bookkeeping += base_committed; |
| 4173 | MOZ_ASSERT(base_mapped >= base_committed)do { static_assert( mozilla::detail::AssertionConditionType< decltype(base_mapped >= base_committed)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(base_mapped >= base_committed ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "base_mapped >= base_committed", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4173); AnnotateMozCrashReason("MOZ_ASSERT" "(" "base_mapped >= base_committed" ")"); do { MOZ_CrashSequence(__null, 4173); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4174 | } |
| 4175 | |
| 4176 | gArenas.mLock.Lock(); |
| 4177 | |
| 4178 | // Stats can only read complete information if its run on the main thread. |
| 4179 | MOZ_ASSERT(gArenas.IsOnMainThreadWeak())do { static_assert( mozilla::detail::AssertionConditionType< decltype(gArenas.IsOnMainThreadWeak())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(gArenas.IsOnMainThreadWeak() ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "gArenas.IsOnMainThreadWeak()", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4179); AnnotateMozCrashReason("MOZ_ASSERT" "(" "gArenas.IsOnMainThreadWeak()" ")"); do { MOZ_CrashSequence(__null, 4179); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4180 | |
| 4181 | // Iterate over arenas. |
| 4182 | for (auto arena : gArenas.iter()) { |
| 4183 | // Cannot safely read stats for this arena and therefore stats would be |
| 4184 | // incomplete. |
| 4185 | MOZ_ASSERT(arena->mLock.SafeOnThisThread())do { static_assert( mozilla::detail::AssertionConditionType< decltype(arena->mLock.SafeOnThisThread())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(arena->mLock.SafeOnThisThread ()))), 0))) { do { } while (false); MOZ_ReportAssertionFailure ("arena->mLock.SafeOnThisThread()", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4185); AnnotateMozCrashReason("MOZ_ASSERT" "(" "arena->mLock.SafeOnThisThread()" ")"); do { MOZ_CrashSequence(__null, 4185); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4186 | |
| 4187 | size_t arena_mapped, arena_allocated, arena_committed, arena_dirty, |
| 4188 | arena_fresh, arena_madvised, j, arena_unused, arena_headers; |
| 4189 | |
| 4190 | arena_headers = 0; |
| 4191 | arena_unused = 0; |
| 4192 | |
| 4193 | { |
| 4194 | MaybeMutexAutoLock lock(arena->mLock); |
| 4195 | |
| 4196 | arena_mapped = arena->mStats.mapped; |
| 4197 | |
| 4198 | // "committed" counts dirty and allocated memory. |
| 4199 | arena_committed = arena->mStats.committed << gPageSize2Pow; |
| 4200 | |
| 4201 | arena_allocated = |
| 4202 | arena->mStats.allocated_small + arena->mStats.allocated_large; |
| 4203 | |
| 4204 | arena_dirty = arena->mNumDirty << gPageSize2Pow; |
| 4205 | arena_fresh = arena->mNumFresh << gPageSize2Pow; |
| 4206 | arena_madvised = arena->mNumMAdvised << gPageSize2Pow; |
| 4207 | |
| 4208 | aStats->num_operations += arena->mStats.operations; |
| 4209 | |
| 4210 | for (j = 0; j < NUM_SMALL_CLASSES(kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + gNumSubPageClasses); j++) { |
| 4211 | arena_bin_t* bin = &arena->mBins[j]; |
| 4212 | size_t bin_unused = 0; |
| 4213 | size_t num_non_full_runs = 0; |
| 4214 | |
| 4215 | for (arena_run_t& run : bin->mNonFullRuns) { |
| 4216 | MOZ_DIAGNOSTIC_ASSERT(run.mMagic == ARENA_RUN_MAGIC)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run.mMagic == 0x384adf93)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run.mMagic == 0x384adf93))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("run.mMagic == 0x384adf93" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4216); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "run.mMagic == 0x384adf93" ")"); do { MOZ_CrashSequence(__null, 4216); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4217 | MOZ_RELEASE_ASSERT(run.mNumFree > 0 &&do { static_assert( mozilla::detail::AssertionConditionType< decltype(run.mNumFree > 0 && run.mNumFree < bin ->mRunNumRegions)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run.mNumFree > 0 && run.mNumFree < bin->mRunNumRegions))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("run.mNumFree > 0 && run.mNumFree < bin->mRunNumRegions" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4218); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "run.mNumFree > 0 && run.mNumFree < bin->mRunNumRegions" ")"); do { MOZ_CrashSequence(__null, 4218); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 4218 | run.mNumFree < bin->mRunNumRegions)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run.mNumFree > 0 && run.mNumFree < bin ->mRunNumRegions)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run.mNumFree > 0 && run.mNumFree < bin->mRunNumRegions))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("run.mNumFree > 0 && run.mNumFree < bin->mRunNumRegions" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4218); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "run.mNumFree > 0 && run.mNumFree < bin->mRunNumRegions" ")"); do { MOZ_CrashSequence(__null, 4218); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4219 | MOZ_RELEASE_ASSERT(run.mBin == bin)do { static_assert( mozilla::detail::AssertionConditionType< decltype(run.mBin == bin)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(run.mBin == bin))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("run.mBin == bin" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4219); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "run.mBin == bin" ")"); do { MOZ_CrashSequence (__null, 4219); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 4220 | MOZ_RELEASE_ASSERT(bin->mNonFullRuns.ElementIsLinkedWell(&run))do { static_assert( mozilla::detail::AssertionConditionType< decltype(bin->mNonFullRuns.ElementIsLinkedWell(&run))> ::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(bin->mNonFullRuns.ElementIsLinkedWell(&run))) ), 0))) { do { } while (false); MOZ_ReportAssertionFailure("bin->mNonFullRuns.ElementIsLinkedWell(&run)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4220); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "bin->mNonFullRuns.ElementIsLinkedWell(&run)" ")"); do { MOZ_CrashSequence(__null, 4220); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4221 | arena_chunk_t* chunk = GetChunkForPtr(&run); |
| 4222 | MOZ_RELEASE_ASSERT(chunk->arena == arena)do { static_assert( mozilla::detail::AssertionConditionType< decltype(chunk->arena == arena)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(chunk->arena == arena))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("chunk->arena == arena" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4222); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "chunk->arena == arena" ")"); do { MOZ_CrashSequence(__null, 4222); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 4223 | bin_unused += run.mNumFree * bin->mSizeClass; |
| 4224 | num_non_full_runs++; |
| 4225 | } |
| 4226 | |
| 4227 | arena_unused += bin_unused; |
| 4228 | arena_headers += bin->mNumRuns * bin->mRunFirstRegionOffset; |
| 4229 | if (aBinStats) { |
| 4230 | aBinStats[j].size = bin->mSizeClass; |
| 4231 | aBinStats[j].num_non_full_runs += num_non_full_runs; |
| 4232 | aBinStats[j].num_runs += bin->mNumRuns; |
| 4233 | aBinStats[j].bytes_unused += bin_unused; |
| 4234 | size_t bytes_per_run = static_cast<size_t>(bin->mRunSizePages) |
| 4235 | << gPageSize2Pow; |
| 4236 | aBinStats[j].bytes_total += |
| 4237 | bin->mNumRuns * (bytes_per_run - bin->mRunFirstRegionOffset); |
| 4238 | aBinStats[j].bytes_per_run = bytes_per_run; |
| 4239 | aBinStats[j].regions_per_run = bin->mRunNumRegions; |
| 4240 | } |
| 4241 | } |
| 4242 | } |
| 4243 | |
| 4244 | MOZ_ASSERT(arena_mapped >= arena_committed)do { static_assert( mozilla::detail::AssertionConditionType< decltype(arena_mapped >= arena_committed)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(arena_mapped >= arena_committed ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "arena_mapped >= arena_committed", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4244); AnnotateMozCrashReason("MOZ_ASSERT" "(" "arena_mapped >= arena_committed" ")"); do { MOZ_CrashSequence(__null, 4244); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4245 | MOZ_ASSERT(arena_committed >= arena_allocated + arena_dirty)do { static_assert( mozilla::detail::AssertionConditionType< decltype(arena_committed >= arena_allocated + arena_dirty) >::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(arena_committed >= arena_allocated + arena_dirty) )), 0))) { do { } while (false); MOZ_ReportAssertionFailure("arena_committed >= arena_allocated + arena_dirty" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4245); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "arena_committed >= arena_allocated + arena_dirty" ")"); do { MOZ_CrashSequence(__null, 4245); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4246 | |
| 4247 | aStats->mapped += arena_mapped; |
| 4248 | aStats->allocated += arena_allocated; |
| 4249 | aStats->pages_dirty += arena_dirty; |
| 4250 | aStats->pages_fresh += arena_fresh; |
| 4251 | aStats->pages_madvised += arena_madvised; |
| 4252 | // "waste" is committed memory that is neither dirty nor |
| 4253 | // allocated. If you change this definition please update |
| 4254 | // memory/replace/logalloc/replay/Replay.cpp's jemalloc_stats calculation of |
| 4255 | // committed. |
| 4256 | MOZ_ASSERT(arena_committed >=do { static_assert( mozilla::detail::AssertionConditionType< decltype(arena_committed >= (arena_allocated + arena_dirty + arena_unused + arena_headers))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(arena_committed >= (arena_allocated + arena_dirty + arena_unused + arena_headers)))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("arena_committed >= (arena_allocated + arena_dirty + arena_unused + arena_headers)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4257); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "arena_committed >= (arena_allocated + arena_dirty + arena_unused + arena_headers)" ")"); do { MOZ_CrashSequence(__null, 4257); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 4257 | (arena_allocated + arena_dirty + arena_unused + arena_headers))do { static_assert( mozilla::detail::AssertionConditionType< decltype(arena_committed >= (arena_allocated + arena_dirty + arena_unused + arena_headers))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(arena_committed >= (arena_allocated + arena_dirty + arena_unused + arena_headers)))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("arena_committed >= (arena_allocated + arena_dirty + arena_unused + arena_headers)" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4257); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "arena_committed >= (arena_allocated + arena_dirty + arena_unused + arena_headers)" ")"); do { MOZ_CrashSequence(__null, 4257); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4258 | aStats->waste += arena_committed - arena_allocated - arena_dirty - |
| 4259 | arena_unused - arena_headers; |
| 4260 | aStats->bin_unused += arena_unused; |
| 4261 | aStats->bookkeeping += arena_headers; |
| 4262 | aStats->narenas++; |
| 4263 | } |
| 4264 | gArenas.mLock.Unlock(); |
| 4265 | |
| 4266 | // Account for arena chunk headers in bookkeeping rather than waste. |
| 4267 | chunk_header_size = |
| 4268 | ((aStats->mapped / aStats->chunksize) * (gChunkHeaderNumPages - 1)) |
| 4269 | << gPageSize2Pow; |
| 4270 | |
| 4271 | aStats->mapped += non_arena_mapped; |
| 4272 | aStats->bookkeeping += chunk_header_size; |
| 4273 | aStats->waste -= chunk_header_size; |
| 4274 | |
| 4275 | MOZ_ASSERT(aStats->mapped >= aStats->allocated + aStats->waste +do { static_assert( mozilla::detail::AssertionConditionType< decltype(aStats->mapped >= aStats->allocated + aStats ->waste + aStats->pages_dirty + aStats->bookkeeping) >::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(aStats->mapped >= aStats->allocated + aStats ->waste + aStats->pages_dirty + aStats->bookkeeping) )), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aStats->mapped >= aStats->allocated + aStats->waste + aStats->pages_dirty + aStats->bookkeeping" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4276); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aStats->mapped >= aStats->allocated + aStats->waste + aStats->pages_dirty + aStats->bookkeeping" ")"); do { MOZ_CrashSequence(__null, 4276); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 4276 | aStats->pages_dirty + aStats->bookkeeping)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aStats->mapped >= aStats->allocated + aStats ->waste + aStats->pages_dirty + aStats->bookkeeping) >::isValid, "invalid assertion condition"); if ((__builtin_expect (!!(!(!!(aStats->mapped >= aStats->allocated + aStats ->waste + aStats->pages_dirty + aStats->bookkeeping) )), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aStats->mapped >= aStats->allocated + aStats->waste + aStats->pages_dirty + aStats->bookkeeping" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4276); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "aStats->mapped >= aStats->allocated + aStats->waste + aStats->pages_dirty + aStats->bookkeeping" ")"); do { MOZ_CrashSequence(__null, 4276); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4277 | } |
| 4278 | |
| 4279 | inline void MozJemalloc::jemalloc_stats_lite(jemalloc_stats_lite_t* aStats) { |
| 4280 | if (!aStats) { |
| 4281 | return; |
| 4282 | } |
| 4283 | if (!malloc_init()) { |
| 4284 | memset(aStats, 0, sizeof(*aStats)); |
| 4285 | return; |
| 4286 | } |
| 4287 | |
| 4288 | aStats->allocated_bytes = 0; |
| 4289 | aStats->num_operations = 0; |
| 4290 | |
| 4291 | // Get huge mapped/allocated. |
| 4292 | { |
| 4293 | MutexAutoLock lock(huge_mtx); |
| 4294 | aStats->allocated_bytes += huge_allocated; |
| 4295 | aStats->num_operations += huge_operations; |
| 4296 | MOZ_ASSERT(huge_mapped >= huge_allocated)do { static_assert( mozilla::detail::AssertionConditionType< decltype(huge_mapped >= huge_allocated)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(huge_mapped >= huge_allocated ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "huge_mapped >= huge_allocated", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4296); AnnotateMozCrashReason("MOZ_ASSERT" "(" "huge_mapped >= huge_allocated" ")"); do { MOZ_CrashSequence(__null, 4296); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4297 | } |
| 4298 | |
| 4299 | { |
| 4300 | MutexAutoLock lock(gArenas.mLock); |
| 4301 | for (auto arena : gArenas.iter()) { |
| 4302 | // We don't need to lock the arena to access these fields. |
| 4303 | aStats->allocated_bytes += arena->AllocatedBytes(); |
| 4304 | aStats->num_operations += arena->Operations(); |
| 4305 | } |
| 4306 | aStats->num_operations += gArenas.OperationsDisposedArenas(); |
| 4307 | } |
| 4308 | } |
| 4309 | |
| 4310 | inline size_t MozJemalloc::jemalloc_stats_num_bins() { |
| 4311 | return NUM_SMALL_CLASSES(kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + gNumSubPageClasses); |
| 4312 | } |
| 4313 | |
| 4314 | inline void MozJemalloc::jemalloc_set_main_thread() { |
| 4315 | MOZ_ASSERT(malloc_initialized)do { static_assert( mozilla::detail::AssertionConditionType< decltype(malloc_initialized)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(malloc_initialized))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("malloc_initialized" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4315); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "malloc_initialized" ")"); do { MOZ_CrashSequence (__null, 4315); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 4316 | gArenas.SetMainThread(); |
| 4317 | } |
| 4318 | |
| 4319 | #ifdef MALLOC_DOUBLE_PURGE |
| 4320 | |
| 4321 | // Explicitly remove all of this chunk's MADV_FREE'd pages from memory. |
| 4322 | static size_t hard_purge_chunk(arena_chunk_t* aChunk) { |
| 4323 | size_t total_npages = 0; |
| 4324 | // See similar logic in arena_t::Purge(). |
| 4325 | for (size_t i = gChunkHeaderNumPages; i < gChunkNumPages; i++) { |
| 4326 | // Find all adjacent pages with CHUNK_MAP_MADVISED set. |
| 4327 | size_t npages; |
| 4328 | for (npages = 0; aChunk->map[i + npages].bits & CHUNK_MAP_MADVISED((size_t)0x40U) && |
| 4329 | i + npages < gChunkNumPages; |
| 4330 | npages++) { |
| 4331 | // Turn off the page's CHUNK_MAP_MADVISED bit and turn on its |
| 4332 | // CHUNK_MAP_FRESH bit. |
| 4333 | MOZ_DIAGNOSTIC_ASSERT(!(aChunk->map[i + npages].bits &do { static_assert( mozilla::detail::AssertionConditionType< decltype(!(aChunk->map[i + npages].bits & (((size_t)0x80U ) | ((size_t)0x20U))))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!(aChunk->map[i + npages] .bits & (((size_t)0x80U) | ((size_t)0x20U)))))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("!(aChunk->map[i + npages].bits & (((size_t)0x80U) | ((size_t)0x20U)))" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4334); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "!(aChunk->map[i + npages].bits & (((size_t)0x80U) | ((size_t)0x20U)))" ")"); do { MOZ_CrashSequence(__null, 4334); __attribute__((nomerge )) ::abort(); } while (false); } } while (false) |
| 4334 | (CHUNK_MAP_FRESH | CHUNK_MAP_DECOMMITTED)))do { static_assert( mozilla::detail::AssertionConditionType< decltype(!(aChunk->map[i + npages].bits & (((size_t)0x80U ) | ((size_t)0x20U))))>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(!(aChunk->map[i + npages] .bits & (((size_t)0x80U) | ((size_t)0x20U)))))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("!(aChunk->map[i + npages].bits & (((size_t)0x80U) | ((size_t)0x20U)))" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4334); AnnotateMozCrashReason ("MOZ_DIAGNOSTIC_ASSERT" "(" "!(aChunk->map[i + npages].bits & (((size_t)0x80U) | ((size_t)0x20U)))" ")"); do { MOZ_CrashSequence(__null, 4334); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4335 | aChunk->map[i + npages].bits ^= (CHUNK_MAP_MADVISED((size_t)0x40U) | CHUNK_MAP_FRESH((size_t)0x80U)); |
| 4336 | } |
| 4337 | |
| 4338 | // We could use mincore to find out which pages are actually |
| 4339 | // present, but it's not clear that's better. |
| 4340 | if (npages > 0) { |
| 4341 | pages_decommit(((char*)aChunk) + (i << gPageSize2Pow), |
| 4342 | npages << gPageSize2Pow); |
| 4343 | Unused << pages_commit(((char*)aChunk) + (i << gPageSize2Pow), |
| 4344 | npages << gPageSize2Pow); |
| 4345 | } |
| 4346 | total_npages += npages; |
| 4347 | i += npages; |
| 4348 | } |
| 4349 | |
| 4350 | return total_npages; |
| 4351 | } |
| 4352 | |
| 4353 | // Explicitly remove all of this arena's MADV_FREE'd pages from memory. |
| 4354 | void arena_t::HardPurge() { |
| 4355 | MaybeMutexAutoLock lock(mLock); |
| 4356 | |
| 4357 | while (!mChunksMAdvised.isEmpty()) { |
| 4358 | arena_chunk_t* chunk = mChunksMAdvised.popFront(); |
| 4359 | size_t npages = hard_purge_chunk(chunk); |
| 4360 | mNumMAdvised -= npages; |
| 4361 | mNumFresh += npages; |
| 4362 | } |
| 4363 | } |
| 4364 | |
| 4365 | inline void MozJemalloc::jemalloc_purge_freed_pages() { |
| 4366 | if (malloc_initialized) { |
| 4367 | MutexAutoLock lock(gArenas.mLock); |
| 4368 | MOZ_ASSERT(gArenas.IsOnMainThreadWeak())do { static_assert( mozilla::detail::AssertionConditionType< decltype(gArenas.IsOnMainThreadWeak())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(gArenas.IsOnMainThreadWeak() ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "gArenas.IsOnMainThreadWeak()", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4368); AnnotateMozCrashReason("MOZ_ASSERT" "(" "gArenas.IsOnMainThreadWeak()" ")"); do { MOZ_CrashSequence(__null, 4368); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4369 | for (auto arena : gArenas.iter()) { |
| 4370 | arena->HardPurge(); |
| 4371 | } |
| 4372 | } |
| 4373 | } |
| 4374 | |
| 4375 | #else // !defined MALLOC_DOUBLE_PURGE |
| 4376 | |
| 4377 | inline void MozJemalloc::jemalloc_purge_freed_pages() { |
| 4378 | // Do nothing. |
| 4379 | } |
| 4380 | |
| 4381 | #endif // defined MALLOC_DOUBLE_PURGE |
| 4382 | |
| 4383 | inline void MozJemalloc::jemalloc_free_dirty_pages(void) { |
| 4384 | if (malloc_initialized) { |
| 4385 | gArenas.MayPurgeAll(PurgeUnconditional, __func__); |
| 4386 | } |
| 4387 | } |
| 4388 | |
| 4389 | inline void MozJemalloc::jemalloc_free_excess_dirty_pages(void) { |
| 4390 | if (malloc_initialized) { |
| 4391 | gArenas.MayPurgeAll(PurgeIfThreshold, __func__); |
| 4392 | } |
| 4393 | } |
| 4394 | |
| 4395 | #ifndef NON_RANDOM_ARENA_IDS1 |
| 4396 | inline arena_t* ArenaCollection::GetByIdInternal(Tree& aTree, |
| 4397 | arena_id_t aArenaId) { |
| 4398 | // Use AlignedStorage2 to avoid running the arena_t constructor, while |
| 4399 | // we only need it as a placeholder for mId. |
| 4400 | mozilla::AlignedStorage2<arena_t> key; |
| 4401 | key.addr()->mId = aArenaId; |
| 4402 | return aTree.Search(key.addr()); |
| 4403 | } |
| 4404 | #endif |
| 4405 | |
| 4406 | inline arena_t* ArenaCollection::GetById(arena_id_t aArenaId, bool aIsPrivate) { |
| 4407 | if (!malloc_initialized) { |
| 4408 | return nullptr; |
| 4409 | } |
| 4410 | |
| 4411 | #ifdef NON_RANDOM_ARENA_IDS1 |
| 4412 | // This function is never called with aIsPrivate = false, let's make sure it |
| 4413 | // doesn't silently change while we're making that assumption below because |
| 4414 | // we can't resolve non-private arenas this way. |
| 4415 | MOZ_RELEASE_ASSERT(aIsPrivate)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aIsPrivate)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(aIsPrivate))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aIsPrivate", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4415); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "aIsPrivate" ")"); do { MOZ_CrashSequence(__null, 4415); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4416 | // This function is not expected to be called before at least one private |
| 4417 | // arena was created. |
| 4418 | // coverity[missing_lock] |
| 4419 | MOZ_RELEASE_ASSERT(mArenaIdKey)do { static_assert( mozilla::detail::AssertionConditionType< decltype(mArenaIdKey)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(mArenaIdKey))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("mArenaIdKey", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4419); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "mArenaIdKey" ")"); do { MOZ_CrashSequence(__null, 4419); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4420 | arena_id_t id = (aArenaId << mArenaIdRotation) | |
| 4421 | (aArenaId >> (sizeof(void*) * 8 - mArenaIdRotation)); |
| 4422 | arena_t* result = reinterpret_cast<arena_t*>(id ^ mArenaIdKey); |
| 4423 | #else |
| 4424 | Tree* tree = nullptr; |
| 4425 | if (aIsPrivate) { |
| 4426 | if (ArenaIdIsMainThreadOnly(aArenaId)) { |
| 4427 | // The main thread only arenas support lock free access, so it's desirable |
| 4428 | // to do GetById without taking mLock either. |
| 4429 | // |
| 4430 | // Races can occur between writers and writers, or between writers and |
| 4431 | // readers. The only writer is the main thread and it will never race |
| 4432 | // against itself so we can elude the lock when the main thread is |
| 4433 | // reading. |
| 4434 | MOZ_ASSERT(IsOnMainThread())do { static_assert( mozilla::detail::AssertionConditionType< decltype(IsOnMainThread())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(IsOnMainThread()))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("IsOnMainThread()" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4434); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "IsOnMainThread()" ")"); do { MOZ_CrashSequence (__null, 4434); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 4435 | MOZ_PUSH_IGNORE_THREAD_SAFETYGCC diagnostic push
GCC diagnostic ignored "-Wthread-safety" |
| 4436 | arena_t* result = GetByIdInternal(mMainThreadArenas, aArenaId); |
| 4437 | MOZ_POP_THREAD_SAFETYGCC diagnostic pop |
| 4438 | MOZ_RELEASE_ASSERT(result)do { static_assert( mozilla::detail::AssertionConditionType< decltype(result)>::isValid, "invalid assertion condition") ; if ((__builtin_expect(!!(!(!!(result))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("result", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4438); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "result" ")"); do { MOZ_CrashSequence(__null, 4438); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4439 | return result; |
| 4440 | } |
| 4441 | tree = &mPrivateArenas; |
| 4442 | } else { |
| 4443 | tree = &mArenas; |
| 4444 | } |
| 4445 | |
| 4446 | MutexAutoLock lock(mLock); |
| 4447 | arena_t* result = GetByIdInternal(*tree, aArenaId); |
| 4448 | #endif |
| 4449 | MOZ_RELEASE_ASSERT(result)do { static_assert( mozilla::detail::AssertionConditionType< decltype(result)>::isValid, "invalid assertion condition") ; if ((__builtin_expect(!!(!(!!(result))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("result", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4449); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "result" ")"); do { MOZ_CrashSequence(__null, 4449); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4450 | MOZ_RELEASE_ASSERT(result->mId == aArenaId)do { static_assert( mozilla::detail::AssertionConditionType< decltype(result->mId == aArenaId)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(result->mId == aArenaId)) ), 0))) { do { } while (false); MOZ_ReportAssertionFailure("result->mId == aArenaId" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4450); AnnotateMozCrashReason ("MOZ_RELEASE_ASSERT" "(" "result->mId == aArenaId" ")"); do { MOZ_CrashSequence(__null, 4450); __attribute__((nomerge)) :: abort(); } while (false); } } while (false); |
| 4451 | return result; |
| 4452 | } |
| 4453 | |
| 4454 | inline arena_id_t MozJemalloc::moz_create_arena_with_params( |
| 4455 | arena_params_t* aParams) { |
| 4456 | if (malloc_init()) { |
| 4457 | arena_t* arena = gArenas.CreateArena(/* IsPrivate = */ true, aParams); |
| 4458 | return arena->mId; |
| 4459 | } |
| 4460 | return 0; |
| 4461 | } |
| 4462 | |
| 4463 | inline void MozJemalloc::moz_dispose_arena(arena_id_t aArenaId) { |
| 4464 | arena_t* arena = gArenas.GetById(aArenaId, /* IsPrivate = */ true); |
| 4465 | MOZ_RELEASE_ASSERT(arena)do { static_assert( mozilla::detail::AssertionConditionType< decltype(arena)>::isValid, "invalid assertion condition"); if ((__builtin_expect(!!(!(!!(arena))), 0))) { do { } while ( false); MOZ_ReportAssertionFailure("arena", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4465); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "arena" ")"); do { MOZ_CrashSequence(__null, 4465); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4466 | gArenas.DisposeArena(arena); |
| 4467 | } |
| 4468 | |
| 4469 | inline void MozJemalloc::moz_set_max_dirty_page_modifier(int32_t aModifier) { |
| 4470 | if (malloc_init()) { |
| 4471 | gArenas.SetDefaultMaxDirtyPageModifier(aModifier); |
| 4472 | } |
| 4473 | } |
| 4474 | |
| 4475 | inline void MozJemalloc::jemalloc_reset_small_alloc_randomization( |
| 4476 | bool aRandomizeSmall) { |
| 4477 | // When this process got forked by ForkServer then it inherited the existing |
| 4478 | // state of mozjemalloc. Specifically, parsing of MALLOC_OPTIONS has already |
| 4479 | // been done but it may not reflect anymore the current set of options after |
| 4480 | // the fork(). |
| 4481 | // |
| 4482 | // Similar behavior is also present on Android where it is also required to |
| 4483 | // perform this step. |
| 4484 | // |
| 4485 | // Content process will have randomization on small malloc disabled via the |
| 4486 | // MALLOC_OPTIONS environment variable set by parent process, missing this |
| 4487 | // will lead to serious performance regressions because CPU prefetch will |
| 4488 | // break, cf bug 1912262. However on forkserver-forked Content processes, the |
| 4489 | // environment is not yet reset when the postfork child handler is being |
| 4490 | // called. |
| 4491 | // |
| 4492 | // This API is here to allow those Content processes (spawned by ForkServer or |
| 4493 | // Android service) to notify jemalloc to turn off the randomization on small |
| 4494 | // allocations and perform the required reinitialization of already existing |
| 4495 | // arena's PRNG. It is important to make sure that the PRNG state is properly |
| 4496 | // re-initialized otherwise child processes would share all the same state. |
| 4497 | |
| 4498 | { |
| 4499 | AutoLock<StaticMutex> lock(gInitLock); |
| 4500 | opt_randomize_small = aRandomizeSmall; |
| 4501 | } |
| 4502 | |
| 4503 | MutexAutoLock lock(gArenas.mLock); |
| 4504 | for (auto* arena : gArenas.iter()) { |
| 4505 | // We can only initialize the PRNG for main-thread-only arenas from the main |
| 4506 | // thread. |
| 4507 | if (!arena->IsMainThreadOnly() || gArenas.IsOnMainThreadWeak()) { |
| 4508 | arena->ResetSmallAllocRandomization(); |
| 4509 | } |
| 4510 | } |
| 4511 | } |
| 4512 | |
| 4513 | inline bool MozJemalloc::moz_enable_deferred_purge(bool aEnabled) { |
| 4514 | return gArenas.SetDeferredPurge(aEnabled); |
| 4515 | } |
| 4516 | |
| 4517 | inline may_purge_now_result_t MozJemalloc::moz_may_purge_now( |
| 4518 | bool aPeekOnly, uint32_t aReuseGraceMS, |
| 4519 | const Maybe<std::function<bool()>>& aKeepGoing) { |
| 4520 | return gArenas.MayPurgeSteps(aPeekOnly, aReuseGraceMS, aKeepGoing); |
| 4521 | } |
| 4522 | |
| 4523 | inline void ArenaCollection::AddToOutstandingPurges(arena_t* aArena) { |
| 4524 | MOZ_ASSERT(aArena)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aArena)>::isValid, "invalid assertion condition") ; if ((__builtin_expect(!!(!(!!(aArena))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aArena", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4524); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aArena" ")" ); do { MOZ_CrashSequence(__null, 4524); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4525 | |
| 4526 | // We cannot trust the caller to know whether the element was already added |
| 4527 | // from another thread given we have our own lock. |
| 4528 | MutexAutoLock lock(mPurgeListLock); |
| 4529 | if (!mOutstandingPurges.ElementProbablyInList(aArena)) { |
| 4530 | mOutstandingPurges.pushBack(aArena); |
| 4531 | } |
| 4532 | } |
| 4533 | |
| 4534 | inline bool ArenaCollection::RemoveFromOutstandingPurges(arena_t* aArena) { |
| 4535 | MOZ_ASSERT(aArena)do { static_assert( mozilla::detail::AssertionConditionType< decltype(aArena)>::isValid, "invalid assertion condition") ; if ((__builtin_expect(!!(!(!!(aArena))), 0))) { do { } while (false); MOZ_ReportAssertionFailure("aArena", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4535); AnnotateMozCrashReason("MOZ_ASSERT" "(" "aArena" ")" ); do { MOZ_CrashSequence(__null, 4535); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4536 | |
| 4537 | // We cannot trust the caller to know whether the element was already removed |
| 4538 | // from another thread given we have our own lock. |
| 4539 | MutexAutoLock lock(mPurgeListLock); |
| 4540 | if (mOutstandingPurges.ElementProbablyInList(aArena)) { |
| 4541 | mOutstandingPurges.remove(aArena); |
| 4542 | return true; |
| 4543 | } |
| 4544 | return false; |
| 4545 | } |
| 4546 | |
| 4547 | may_purge_now_result_t ArenaCollection::MayPurgeSteps( |
| 4548 | bool aPeekOnly, uint32_t aReuseGraceMS, |
| 4549 | const Maybe<std::function<bool()>>& aKeepGoing) { |
| 4550 | // This only works on the main thread because it may process main-thread-only |
| 4551 | // arenas. |
| 4552 | MOZ_ASSERT(IsOnMainThreadWeak())do { static_assert( mozilla::detail::AssertionConditionType< decltype(IsOnMainThreadWeak())>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(IsOnMainThreadWeak()))), 0)) ) { do { } while (false); MOZ_ReportAssertionFailure("IsOnMainThreadWeak()" , "/root/firefox-clang/memory/build/mozjemalloc.cpp", 4552); AnnotateMozCrashReason ("MOZ_ASSERT" "(" "IsOnMainThreadWeak()" ")"); do { MOZ_CrashSequence (__null, 4552); __attribute__((nomerge)) ::abort(); } while ( false); } } while (false); |
| 4553 | |
| 4554 | uint64_t now = GetTimestampNS(); |
| 4555 | uint64_t reuseGraceNS = (uint64_t)aReuseGraceMS * 1000 * 1000; |
| 4556 | arena_t* found = nullptr; |
| 4557 | { |
| 4558 | MutexAutoLock lock(mPurgeListLock); |
| 4559 | if (mOutstandingPurges.isEmpty()) { |
| 4560 | return may_purge_now_result_t::Done; |
| 4561 | } |
| 4562 | for (arena_t& arena : mOutstandingPurges) { |
| 4563 | if (now - arena.mLastSignificantReuseNS >= reuseGraceNS) { |
| 4564 | found = &arena; |
| 4565 | break; |
| 4566 | } |
| 4567 | } |
| 4568 | |
| 4569 | if (!found) { |
| 4570 | return may_purge_now_result_t::WantsLater; |
| 4571 | } |
| 4572 | if (aPeekOnly) { |
| 4573 | return may_purge_now_result_t::NeedsMore; |
| 4574 | } |
| 4575 | |
| 4576 | // We need to avoid the invalid state where mIsDeferredPurgePending is set |
| 4577 | // but the arena is not in the list or about to be added. So remove the |
| 4578 | // arena from the list before calling Purge(). |
| 4579 | mOutstandingPurges.remove(found); |
| 4580 | } |
| 4581 | |
| 4582 | ArenaPurgeResult pr = |
| 4583 | found->PurgeLoop(PurgeIfThreshold, __func__, aReuseGraceMS, aKeepGoing); |
| 4584 | |
| 4585 | if (pr == ArenaPurgeResult::NotDone) { |
| 4586 | // If there's more work to do we re-insert the arena into the purge queue. |
| 4587 | // If the arena was busy we don't since the other thread that's purging it |
| 4588 | // will finish that work. |
| 4589 | |
| 4590 | // Note that after the above Purge() and taking the lock below there's a |
| 4591 | // chance another thread may be purging the arena and clear |
| 4592 | // mIsDeferredPurgePending. Resulting in the state of being in the list |
| 4593 | // with that flag clear. That's okay since the next time a purge occurs |
| 4594 | // (and one will because it's in the list) it'll clear the flag and the |
| 4595 | // state will be consistent again. |
| 4596 | MutexAutoLock lock(mPurgeListLock); |
| 4597 | if (!mOutstandingPurges.ElementProbablyInList(found)) { |
| 4598 | // Given we want to continue to purge this arena, push it to the front |
| 4599 | // to increase the probability to find it fast. |
| 4600 | mOutstandingPurges.pushFront(found); |
| 4601 | } |
| 4602 | } else if (pr == ArenaPurgeResult::Dying) { |
| 4603 | delete found; |
| 4604 | } |
| 4605 | |
| 4606 | // Even if there is no other arena that needs work, let the caller just call |
| 4607 | // us again and we will do the above checks then and return their result. |
| 4608 | // Note that in the current surrounding setting this may (rarely) cause a |
| 4609 | // new slice of our idle task runner if we are exceeding idle budget. |
| 4610 | return may_purge_now_result_t::NeedsMore; |
| 4611 | } |
| 4612 | |
| 4613 | void ArenaCollection::MayPurgeAll(PurgeCondition aCond, const char* aCaller) { |
| 4614 | MutexAutoLock lock(mLock); |
| 4615 | for (auto* arena : iter()) { |
| 4616 | // Arenas that are not IsMainThreadOnly can be purged from any thread. |
| 4617 | // So we do what we can even if called from another thread. |
| 4618 | if (!arena->IsMainThreadOnly() || IsOnMainThreadWeak()) { |
| 4619 | RemoveFromOutstandingPurges(arena); |
| 4620 | ArenaPurgeResult pr = arena->PurgeLoop(aCond, aCaller); |
| 4621 | |
| 4622 | // No arena can die here because we're holding the arena collection lock. |
| 4623 | // Arenas are removed from the collection before setting their mDying |
| 4624 | // flag. |
| 4625 | MOZ_RELEASE_ASSERT(pr != ArenaPurgeResult::Dying)do { static_assert( mozilla::detail::AssertionConditionType< decltype(pr != ArenaPurgeResult::Dying)>::isValid, "invalid assertion condition" ); if ((__builtin_expect(!!(!(!!(pr != ArenaPurgeResult::Dying ))), 0))) { do { } while (false); MOZ_ReportAssertionFailure( "pr != ArenaPurgeResult::Dying", "/root/firefox-clang/memory/build/mozjemalloc.cpp" , 4625); AnnotateMozCrashReason("MOZ_RELEASE_ASSERT" "(" "pr != ArenaPurgeResult::Dying" ")"); do { MOZ_CrashSequence(__null, 4625); __attribute__((nomerge )) ::abort(); } while (false); } } while (false); |
| 4626 | } |
| 4627 | } |
| 4628 | } |
| 4629 | |
| 4630 | #define MALLOC_DECL(name, return_type, ...) \ |
| 4631 | inline return_type MozJemalloc::moz_arena_##name( \ |
| 4632 | arena_id_t aArenaId, ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)##__VA_ARGS__ arg1) { \ |
| 4633 | BaseAllocator allocator( \ |
| 4634 | gArenas.GetById(aArenaId, /* IsPrivate = */ true)); \ |
| 4635 | return allocator.name(ARGS_HELPER(ARGS, ##__VA_ARGS__)arg1); \ |
| 4636 | } |
| 4637 | #define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE1 |
| 4638 | #include "malloc_decls.h" |
| 4639 | |
| 4640 | // End non-standard functions. |
| 4641 | // *************************************************************************** |
| 4642 | #ifndef XP_WIN |
| 4643 | // Begin library-private functions, used by threading libraries for protection |
| 4644 | // of malloc during fork(). These functions are only called if the program is |
| 4645 | // running in threaded mode, so there is no need to check whether the program |
| 4646 | // is threaded here. |
| 4647 | // |
| 4648 | // Note that the only way to keep the main-thread-only arenas in a consistent |
| 4649 | // state for the child is if fork is called from the main thread only. Or the |
| 4650 | // child must not use them, eg it should call exec(). We attempt to prevent the |
| 4651 | // child for accessing these arenas by refusing to re-initialise them. |
| 4652 | // |
| 4653 | // This is only accessed in the fork handlers while gArenas.mLock is held. |
| 4654 | static pthread_t gForkingThread; |
| 4655 | |
| 4656 | # ifdef XP_DARWIN |
| 4657 | // This is only accessed in the fork handlers while gArenas.mLock is held. |
| 4658 | static pid_t gForkingProcess; |
| 4659 | # endif |
| 4660 | |
| 4661 | FORK_HOOKstatic |
| 4662 | void _malloc_prefork(void) MOZ_NO_THREAD_SAFETY_ANALYSIS__attribute__((no_thread_safety_analysis)) { |
| 4663 | // Acquire all mutexes in a safe order. |
| 4664 | gArenas.mLock.Lock(); |
| 4665 | gForkingThread = pthread_self(); |
| 4666 | # ifdef XP_DARWIN |
| 4667 | gForkingProcess = getpid(); |
| 4668 | # endif |
| 4669 | |
| 4670 | for (auto arena : gArenas.iter()) { |
| 4671 | if (arena->mLock.LockIsEnabled()) { |
| 4672 | arena->mLock.Lock(); |
| 4673 | } |
| 4674 | } |
| 4675 | |
| 4676 | gArenas.mPurgeListLock.Lock(); |
| 4677 | |
| 4678 | base_mtx.Lock(); |
| 4679 | |
| 4680 | huge_mtx.Lock(); |
| 4681 | } |
| 4682 | |
| 4683 | FORK_HOOKstatic |
| 4684 | void _malloc_postfork_parent(void) MOZ_NO_THREAD_SAFETY_ANALYSIS__attribute__((no_thread_safety_analysis)) { |
| 4685 | // Release all mutexes, now that fork() has completed. |
| 4686 | huge_mtx.Unlock(); |
| 4687 | |
| 4688 | base_mtx.Unlock(); |
| 4689 | |
| 4690 | gArenas.mPurgeListLock.Unlock(); |
| 4691 | |
| 4692 | for (auto arena : gArenas.iter()) { |
| 4693 | if (arena->mLock.LockIsEnabled()) { |
| 4694 | arena->mLock.Unlock(); |
| 4695 | } |
| 4696 | } |
| 4697 | |
| 4698 | gArenas.mLock.Unlock(); |
| 4699 | } |
| 4700 | |
| 4701 | FORK_HOOKstatic |
| 4702 | void _malloc_postfork_child(void) { |
| 4703 | // Do this before iterating over the arenas. |
| 4704 | gArenas.ResetMainThread(); |
| 4705 | |
| 4706 | // Reinitialize all mutexes, now that fork() has completed. |
| 4707 | huge_mtx.Init(); |
| 4708 | |
| 4709 | base_mtx.Init(); |
| 4710 | |
| 4711 | gArenas.mPurgeListLock.Init(); |
| 4712 | |
| 4713 | MOZ_PUSH_IGNORE_THREAD_SAFETYGCC diagnostic push
GCC diagnostic ignored "-Wthread-safety" |
| 4714 | for (auto arena : gArenas.iter()) { |
| 4715 | arena->mLock.Reinit(gForkingThread); |
| 4716 | } |
| 4717 | MOZ_POP_THREAD_SAFETYGCC diagnostic pop |
| 4718 | |
| 4719 | gArenas.mLock.Init(); |
| 4720 | } |
| 4721 | |
| 4722 | # ifdef XP_DARWIN |
| 4723 | FORK_HOOKstatic |
| 4724 | void _malloc_postfork(void) { |
| 4725 | // On MacOS we need to check if this is running in the parent or child |
| 4726 | // process. |
| 4727 | bool is_in_parent = getpid() == gForkingProcess; |
| 4728 | gForkingProcess = 0; |
| 4729 | if (is_in_parent) { |
| 4730 | _malloc_postfork_parent(); |
| 4731 | } else { |
| 4732 | _malloc_postfork_child(); |
| 4733 | } |
| 4734 | } |
| 4735 | # endif // XP_DARWIN |
| 4736 | #endif // ! XP_WIN |
| 4737 | |
| 4738 | // End library-private functions. |
| 4739 | // *************************************************************************** |
| 4740 | #ifdef MOZ_REPLACE_MALLOC1 |
| 4741 | // Windows doesn't come with weak imports as they are possible with |
| 4742 | // LD_PRELOAD or DYLD_INSERT_LIBRARIES on Linux/OSX. On this platform, |
| 4743 | // the replacement functions are defined as variable pointers to the |
| 4744 | // function resolved with GetProcAddress() instead of weak definitions |
| 4745 | // of functions. On Android, the same needs to happen as well, because |
| 4746 | // the Android linker doesn't handle weak linking with non LD_PRELOADed |
| 4747 | // libraries, but LD_PRELOADing is not very convenient on Android, with |
| 4748 | // the zygote. |
| 4749 | # ifdef XP_DARWIN |
| 4750 | # define MOZ_REPLACE_WEAK__attribute__((weak)) __attribute__((weak_import)) |
| 4751 | # elif defined(XP_WIN) || defined(ANDROID) |
| 4752 | # define MOZ_DYNAMIC_REPLACE_INIT |
| 4753 | # define replace_init replace_init_decl |
| 4754 | # elif defined(__GNUC__4) |
| 4755 | # define MOZ_REPLACE_WEAK__attribute__((weak)) __attribute__((weak)) |
| 4756 | # endif |
| 4757 | |
| 4758 | # include "replace_malloc.h" |
| 4759 | |
| 4760 | # define MALLOC_DECL(name, return_type, ...) CanonicalMalloc::name, |
| 4761 | |
| 4762 | // The default malloc table, i.e. plain allocations. It never changes. It's |
| 4763 | // used by init(), and not used after that. |
| 4764 | static const malloc_table_t gDefaultMallocTable = { |
| 4765 | # include "malloc_decls.h" |
| 4766 | }; |
| 4767 | |
| 4768 | // The malloc table installed by init(). It never changes from that point |
| 4769 | // onward. It will be the same as gDefaultMallocTable if no replace-malloc tool |
| 4770 | // is enabled at startup. |
| 4771 | static malloc_table_t gOriginalMallocTable = { |
| 4772 | # include "malloc_decls.h" |
| 4773 | }; |
| 4774 | |
| 4775 | // The malloc table installed by jemalloc_replace_dynamic(). (Read the |
| 4776 | // comments above that function for more details.) |
| 4777 | static malloc_table_t gDynamicMallocTable = { |
| 4778 | # include "malloc_decls.h" |
| 4779 | }; |
| 4780 | |
| 4781 | // This briefly points to gDefaultMallocTable at startup. After that, it points |
| 4782 | // to either gOriginalMallocTable or gDynamicMallocTable. It's atomic to avoid |
| 4783 | // races when switching between tables. |
| 4784 | static Atomic<malloc_table_t const*, mozilla::MemoryOrdering::Relaxed> |
| 4785 | gMallocTablePtr; |
| 4786 | |
| 4787 | # ifdef MOZ_DYNAMIC_REPLACE_INIT |
| 4788 | # undef replace_init |
| 4789 | typedef decltype(replace_init_decl) replace_init_impl_t; |
| 4790 | static replace_init_impl_t* replace_init = nullptr; |
| 4791 | # endif |
| 4792 | |
| 4793 | # ifdef XP_WIN |
| 4794 | typedef HMODULE replace_malloc_handle_t; |
| 4795 | |
| 4796 | static replace_malloc_handle_t replace_malloc_handle() { |
| 4797 | wchar_t replace_malloc_lib[1024]; |
| 4798 | if (GetEnvironmentVariableW(L"MOZ_REPLACE_MALLOC_LIB", replace_malloc_lib, |
| 4799 | std::size(replace_malloc_lib)) > 0) { |
| 4800 | return LoadLibraryW(replace_malloc_lib); |
| 4801 | } |
| 4802 | return nullptr; |
| 4803 | } |
| 4804 | |
| 4805 | # define REPLACE_MALLOC_GET_INIT_FUNC(handle) \ |
| 4806 | (replace_init_impl_t*)GetProcAddress(handle, "replace_init") |
| 4807 | |
| 4808 | # elif defined(ANDROID) |
| 4809 | # include <dlfcn.h> |
| 4810 | |
| 4811 | typedef void* replace_malloc_handle_t; |
| 4812 | |
| 4813 | static replace_malloc_handle_t replace_malloc_handle() { |
| 4814 | const char* replace_malloc_lib = getenv("MOZ_REPLACE_MALLOC_LIB"); |
| 4815 | if (replace_malloc_lib && *replace_malloc_lib) { |
| 4816 | return dlopen(replace_malloc_lib, RTLD_LAZY0x00001); |
| 4817 | } |
| 4818 | return nullptr; |
| 4819 | } |
| 4820 | |
| 4821 | # define REPLACE_MALLOC_GET_INIT_FUNC(handle) \ |
| 4822 | (replace_init_impl_t*)dlsym(handle, "replace_init") |
| 4823 | |
| 4824 | # endif |
| 4825 | |
| 4826 | static void replace_malloc_init_funcs(malloc_table_t*); |
| 4827 | |
| 4828 | # ifdef MOZ_REPLACE_MALLOC_STATIC1 |
| 4829 | extern "C" void logalloc_init(malloc_table_t*, ReplaceMallocBridge**); |
| 4830 | |
| 4831 | extern "C" void dmd_init(malloc_table_t*, ReplaceMallocBridge**); |
| 4832 | # endif |
| 4833 | |
| 4834 | void phc_init(malloc_table_t*, ReplaceMallocBridge**); |
| 4835 | |
| 4836 | bool Equals(const malloc_table_t& aTable1, const malloc_table_t& aTable2) { |
| 4837 | return memcmp(&aTable1, &aTable2, sizeof(malloc_table_t)) == 0; |
| 4838 | } |
| 4839 | |
| 4840 | // Below is the malloc implementation overriding jemalloc and calling the |
| 4841 | // replacement functions if they exist. |
| 4842 | static ReplaceMallocBridge* gReplaceMallocBridge = nullptr; |
| 4843 | static void init() { |
| 4844 | malloc_table_t tempTable = gDefaultMallocTable; |
| 4845 | |
| 4846 | # ifdef MOZ_DYNAMIC_REPLACE_INIT |
| 4847 | replace_malloc_handle_t handle = replace_malloc_handle(); |
| 4848 | if (handle) { |
| 4849 | replace_init = REPLACE_MALLOC_GET_INIT_FUNC(handle); |
| 4850 | } |
| 4851 | # endif |
| 4852 | |
| 4853 | // Set this *before* calling replace_init, otherwise if replace_init calls |
| 4854 | // malloc() we'll get an infinite loop. |
| 4855 | gMallocTablePtr = &gDefaultMallocTable; |
| 4856 | |
| 4857 | // Pass in the default allocator table so replace functions can copy and use |
| 4858 | // it for their allocations. The replace_init() function should modify the |
| 4859 | // table if it wants to be active, otherwise leave it unmodified. |
| 4860 | if (replace_init) { |
| 4861 | replace_init(&tempTable, &gReplaceMallocBridge); |
| 4862 | } |
| 4863 | # ifdef MOZ_REPLACE_MALLOC_STATIC1 |
| 4864 | if (Equals(tempTable, gDefaultMallocTable)) { |
| 4865 | logalloc_init(&tempTable, &gReplaceMallocBridge); |
| 4866 | } |
| 4867 | # ifdef MOZ_DMD1 |
| 4868 | if (Equals(tempTable, gDefaultMallocTable)) { |
| 4869 | dmd_init(&tempTable, &gReplaceMallocBridge); |
| 4870 | } |
| 4871 | # endif |
| 4872 | # endif |
| 4873 | if (!Equals(tempTable, gDefaultMallocTable)) { |
| 4874 | replace_malloc_init_funcs(&tempTable); |
| 4875 | } |
| 4876 | gOriginalMallocTable = tempTable; |
| 4877 | gMallocTablePtr = &gOriginalMallocTable; |
| 4878 | } |
| 4879 | |
| 4880 | // WARNING WARNING WARNING: this function should be used with extreme care. It |
| 4881 | // is not as general-purpose as it looks. It is currently used by |
| 4882 | // tools/profiler/core/memory_hooks.cpp for counting allocations and probably |
| 4883 | // should not be used for any other purpose. |
| 4884 | // |
| 4885 | // This function allows the original malloc table to be temporarily replaced by |
| 4886 | // a different malloc table. Or, if the argument is nullptr, it switches back to |
| 4887 | // the original malloc table. |
| 4888 | // |
| 4889 | // Limitations: |
| 4890 | // |
| 4891 | // - It is not threadsafe. If multiple threads pass it the same |
| 4892 | // `replace_init_func` at the same time, there will be data races writing to |
| 4893 | // the malloc_table_t within that function. |
| 4894 | // |
| 4895 | // - Only one replacement can be installed. No nesting is allowed. |
| 4896 | // |
| 4897 | // - The new malloc table must be able to free allocations made by the original |
| 4898 | // malloc table, and upon removal the original malloc table must be able to |
| 4899 | // free allocations made by the new malloc table. This means the new malloc |
| 4900 | // table can only do simple things like recording extra information, while |
| 4901 | // delegating actual allocation/free operations to the original malloc table. |
| 4902 | // |
| 4903 | MOZ_JEMALLOC_APIextern "C" __attribute__((visibility("default"))) void jemalloc_replace_dynamic( |
| 4904 | jemalloc_init_func replace_init_func) { |
| 4905 | if (replace_init_func) { |
| 4906 | malloc_table_t tempTable = gOriginalMallocTable; |
| 4907 | (*replace_init_func)(&tempTable, &gReplaceMallocBridge); |
| 4908 | if (!Equals(tempTable, gOriginalMallocTable)) { |
| 4909 | replace_malloc_init_funcs(&tempTable); |
| 4910 | |
| 4911 | // Temporarily switch back to the original malloc table. In the |
| 4912 | // (supported) non-nested case, this is a no-op. But just in case this is |
| 4913 | // a (unsupported) nested call, it makes the overwriting of |
| 4914 | // gDynamicMallocTable less racy, because ongoing calls to malloc() and |
| 4915 | // friends won't go through gDynamicMallocTable. |
| 4916 | gMallocTablePtr = &gOriginalMallocTable; |
| 4917 | |
| 4918 | gDynamicMallocTable = tempTable; |
| 4919 | gMallocTablePtr = &gDynamicMallocTable; |
| 4920 | // We assume that dynamic replaces don't occur close enough for a |
| 4921 | // thread to still have old copies of the table pointer when the 2nd |
| 4922 | // replace occurs. |
| 4923 | } |
| 4924 | } else { |
| 4925 | // Switch back to the original malloc table. |
| 4926 | gMallocTablePtr = &gOriginalMallocTable; |
| 4927 | } |
| 4928 | } |
| 4929 | |
| 4930 | # define MALLOC_DECL(name, return_type, ...) \ |
| 4931 | inline return_type ReplaceMalloc::name( \ |
| 4932 | ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)##__VA_ARGS__ arg1) { \ |
| 4933 | if (MOZ_UNLIKELY(!gMallocTablePtr)(__builtin_expect(!!(!gMallocTablePtr), 0))) { \ |
| 4934 | init(); \ |
| 4935 | } \ |
| 4936 | return (*gMallocTablePtr).name(ARGS_HELPER(ARGS, ##__VA_ARGS__)arg1); \ |
| 4937 | } |
| 4938 | # include "malloc_decls.h" |
| 4939 | |
| 4940 | MOZ_JEMALLOC_APIextern "C" __attribute__((visibility("default"))) struct ReplaceMallocBridge* get_bridge(void) { |
| 4941 | if (MOZ_UNLIKELY(!gMallocTablePtr)(__builtin_expect(!!(!gMallocTablePtr), 0))) { |
| 4942 | init(); |
| 4943 | } |
| 4944 | return gReplaceMallocBridge; |
| 4945 | } |
| 4946 | |
| 4947 | // posix_memalign, aligned_alloc, memalign and valloc all implement some kind |
| 4948 | // of aligned memory allocation. For convenience, a replace-malloc library can |
| 4949 | // skip defining replace_posix_memalign, replace_aligned_alloc and |
| 4950 | // replace_valloc, and default implementations will be automatically derived |
| 4951 | // from replace_memalign. |
| 4952 | static void replace_malloc_init_funcs(malloc_table_t* table) { |
| 4953 | if (table->posix_memalign == CanonicalMalloc::posix_memalign && |
| 4954 | table->memalign != CanonicalMalloc::memalign) { |
| 4955 | table->posix_memalign = |
| 4956 | AlignedAllocator<ReplaceMalloc::memalign>::posix_memalign; |
| 4957 | } |
| 4958 | if (table->aligned_alloc == CanonicalMalloc::aligned_alloc && |
| 4959 | table->memalign != CanonicalMalloc::memalign) { |
| 4960 | table->aligned_alloc = |
| 4961 | AlignedAllocator<ReplaceMalloc::memalign>::aligned_alloc; |
| 4962 | } |
| 4963 | if (table->valloc == CanonicalMalloc::valloc && |
| 4964 | table->memalign != CanonicalMalloc::memalign) { |
| 4965 | table->valloc = AlignedAllocator<ReplaceMalloc::memalign>::valloc; |
| 4966 | } |
| 4967 | if (table->moz_create_arena_with_params == |
| 4968 | CanonicalMalloc::moz_create_arena_with_params && |
| 4969 | table->malloc != CanonicalMalloc::malloc) { |
| 4970 | # define MALLOC_DECL(name, ...) \ |
| 4971 | table->name = DummyArenaAllocator<ReplaceMalloc>::name; |
| 4972 | # define MALLOC_FUNCS MALLOC_FUNCS_ARENA_BASE8 |
| 4973 | # include "malloc_decls.h" |
| 4974 | } |
| 4975 | if (table->moz_arena_malloc == CanonicalMalloc::moz_arena_malloc && |
| 4976 | table->malloc != CanonicalMalloc::malloc) { |
| 4977 | # define MALLOC_DECL(name, ...) \ |
| 4978 | table->name = DummyArenaAllocator<ReplaceMalloc>::name; |
| 4979 | # define MALLOC_FUNCS MALLOC_FUNCS_ARENA_ALLOC16 |
| 4980 | # include "malloc_decls.h" |
| 4981 | } |
| 4982 | } |
| 4983 | |
| 4984 | #endif // MOZ_REPLACE_MALLOC |
| 4985 | // *************************************************************************** |
| 4986 | // Definition of all the _impl functions |
| 4987 | // GENERIC_MALLOC_DECL2_MINGW is only used for the MinGW build, and aliases |
| 4988 | // the malloc funcs (e.g. malloc) to the je_ versions. It does not generate |
| 4989 | // aliases for the other functions (jemalloc and arena functions). |
| 4990 | // |
| 4991 | // We do need aliases for the other mozglue.def-redirected functions though, |
| 4992 | // these are done at the bottom of mozmemory_wrap.cpp |
| 4993 | #define GENERIC_MALLOC_DECL2_MINGW(name, name_impl, return_type, ...)return_type name(... arg1) __attribute__((alias("name_impl")) ); \ |
| 4994 | return_type name(ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)##__VA_ARGS__ arg1) \ |
| 4995 | __attribute__((alias(MOZ_STRINGIFY(name_impl)"name_impl"))); |
| 4996 | |
| 4997 | #define GENERIC_MALLOC_DECL2(attributes, name, name_impl, return_type, ...)return_type name_impl(... arg1) attributes { return DefaultMalloc ::name(arg1); } \ |
| 4998 | return_type name_impl(ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)##__VA_ARGS__ arg1) attributes { \ |
| 4999 | return DefaultMalloc::name(ARGS_HELPER(ARGS, ##__VA_ARGS__)arg1); \ |
| 5000 | } |
| 5001 | |
| 5002 | #ifndef __MINGW32__ |
| 5003 | # define GENERIC_MALLOC_DECL(attributes, name, return_type, ...)return_type name(... arg1) attributes { return DefaultMalloc:: name(arg1); } \ |
| 5004 | GENERIC_MALLOC_DECL2(attributes, name, name##_impl, return_type, \return_type name##_impl(##__VA_ARGS__ arg1) attributes { return DefaultMalloc::name(arg1); } |
| 5005 | ##__VA_ARGS__)return_type name##_impl(##__VA_ARGS__ arg1) attributes { return DefaultMalloc::name(arg1); } |
| 5006 | #else |
| 5007 | # define GENERIC_MALLOC_DECL(attributes, name, return_type, ...)return_type name(... arg1) attributes { return DefaultMalloc:: name(arg1); } \ |
| 5008 | GENERIC_MALLOC_DECL2(attributes, name, name##_impl, return_type, \return_type name##_impl(##__VA_ARGS__ arg1) attributes { return DefaultMalloc::name(arg1); } |
| 5009 | ##__VA_ARGS__)return_type name##_impl(##__VA_ARGS__ arg1) attributes { return DefaultMalloc::name(arg1); } \ |
| 5010 | GENERIC_MALLOC_DECL2_MINGW(name, name##_impl, return_type, ##__VA_ARGS__)return_type name(##__VA_ARGS__ arg1) __attribute__((alias("name##_impl" ))); |
| 5011 | #endif |
| 5012 | |
| 5013 | #define NOTHROW_MALLOC_DECL(...) \ |
| 5014 | MOZ_MEMORY_APIextern "C" __attribute__((visibility("default"))) MACRO_CALL(GENERIC_MALLOC_DECL, (noexcept(true), __VA_ARGS__))GENERIC_MALLOC_DECL |
| 5015 | #define MALLOC_DECL(...) \ |
| 5016 | MOZ_MEMORY_APIextern "C" __attribute__((visibility("default"))) MACRO_CALL(GENERIC_MALLOC_DECL, (, __VA_ARGS__))GENERIC_MALLOC_DECL |
| 5017 | #define MALLOC_FUNCS MALLOC_FUNCS_MALLOC(1 | 2) |
| 5018 | #include "malloc_decls.h" |
| 5019 | |
| 5020 | #undef GENERIC_MALLOC_DECL |
| 5021 | #define GENERIC_MALLOC_DECL(attributes, name, return_type, ...)return_type name(... arg1) attributes { return DefaultMalloc:: name(arg1); } \ |
| 5022 | GENERIC_MALLOC_DECL2(attributes, name, name, return_type, ##__VA_ARGS__)return_type name(##__VA_ARGS__ arg1) attributes { return DefaultMalloc ::name(arg1); } |
| 5023 | |
| 5024 | #define MALLOC_DECL(...) \ |
| 5025 | MOZ_JEMALLOC_APIextern "C" __attribute__((visibility("default"))) MACRO_CALL(GENERIC_MALLOC_DECL, (, __VA_ARGS__))GENERIC_MALLOC_DECL |
| 5026 | #define MALLOC_FUNCS (MALLOC_FUNCS_JEMALLOC4 | MALLOC_FUNCS_ARENA(8 | 16)) |
| 5027 | #include "malloc_decls.h" |
| 5028 | // *************************************************************************** |
| 5029 | |
| 5030 | #ifdef HAVE_DLFCN_H1 |
| 5031 | # include <dlfcn.h> |
| 5032 | #endif |
| 5033 | |
| 5034 | #if defined(__GLIBC__2) && !defined(__UCLIBC__) |
| 5035 | // glibc provides the RTLD_DEEPBIND flag for dlopen which can make it possible |
| 5036 | // to inconsistently reference libc's malloc(3)-compatible functions |
| 5037 | // (bug 493541). |
| 5038 | // |
| 5039 | // These definitions interpose hooks in glibc. The functions are actually |
| 5040 | // passed an extra argument for the caller return address, which will be |
| 5041 | // ignored. |
| 5042 | |
| 5043 | extern "C" { |
| 5044 | MOZ_EXPORT__attribute__((visibility("default"))) void (*__free_hook)(void*) = free_implfree; |
| 5045 | MOZ_EXPORT__attribute__((visibility("default"))) void* (*__malloc_hook)(size_t) = malloc_implmalloc; |
| 5046 | MOZ_EXPORT__attribute__((visibility("default"))) void* (*__realloc_hook)(void*, size_t) = realloc_implrealloc; |
| 5047 | MOZ_EXPORT__attribute__((visibility("default"))) void* (*__memalign_hook)(size_t, size_t) = memalign_implmemalign; |
| 5048 | } |
| 5049 | |
| 5050 | #elif defined(RTLD_DEEPBIND0x00008) |
| 5051 | // XXX On systems that support RTLD_GROUP or DF_1_GROUP, do their |
| 5052 | // implementations permit similar inconsistencies? Should STV_SINGLETON |
| 5053 | // visibility be used for interposition where available? |
| 5054 | # error \ |
| 5055 | "Interposing malloc is unsafe on this system without libc malloc hooks." |
| 5056 | #endif |
| 5057 | |
| 5058 | #ifdef XP_WIN |
| 5059 | MOZ_EXPORT__attribute__((visibility("default"))) void* _recalloc(void* aPtr, size_t aCount, size_t aSize) { |
| 5060 | size_t oldsize = aPtr ? AllocInfo::Get(aPtr).Size() : 0; |
| 5061 | CheckedInt<size_t> checkedSize = CheckedInt<size_t>(aCount) * aSize; |
| 5062 | |
| 5063 | if (!checkedSize.isValid()) { |
| 5064 | return nullptr; |
| 5065 | } |
| 5066 | |
| 5067 | size_t newsize = checkedSize.value(); |
| 5068 | |
| 5069 | // In order for all trailing bytes to be zeroed, the caller needs to |
| 5070 | // use calloc(), followed by recalloc(). However, the current calloc() |
| 5071 | // implementation only zeros the bytes requested, so if recalloc() is |
| 5072 | // to work 100% correctly, calloc() will need to change to zero |
| 5073 | // trailing bytes. |
| 5074 | aPtr = DefaultMalloc::realloc(aPtr, newsize); |
| 5075 | if (aPtr && oldsize < newsize) { |
| 5076 | memset((void*)((uintptr_t)aPtr + oldsize), 0, newsize - oldsize); |
| 5077 | } |
| 5078 | |
| 5079 | return aPtr; |
| 5080 | } |
| 5081 | |
| 5082 | // This impl of _expand doesn't ever actually expand or shrink blocks: it |
| 5083 | // simply replies that you may continue using a shrunk block. |
| 5084 | MOZ_EXPORT__attribute__((visibility("default"))) void* _expand(void* aPtr, size_t newsize) { |
| 5085 | if (AllocInfo::Get(aPtr).Size() >= newsize) { |
| 5086 | return aPtr; |
| 5087 | } |
| 5088 | |
| 5089 | return nullptr; |
| 5090 | } |
| 5091 | |
| 5092 | MOZ_EXPORT__attribute__((visibility("default"))) size_t _msize(void* aPtr) { |
| 5093 | return DefaultMalloc::malloc_usable_size(aPtr); |
| 5094 | } |
| 5095 | #endif |
| 5096 | |
| 5097 | #ifdef MOZ_PHC1 |
| 5098 | // Compile PHC and mozjemalloc together so that PHC can inline mozjemalloc. |
| 5099 | # include "PHC.cpp" |
| 5100 | #endif |