kc3-lang/angle/src/common/aligned_memory.cpp

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• Hash : e208994a
  Author :
  Date : 2024-07-09T13:43:54
  

  Add a note about std::aligned_alloc caveats
  
  Doesn't seem worth touching:
  * MSVC remains a special case
  * aligned_alloc adds a constraint on alloc size
  
  Bug: angleproject:352054650
  Change-Id: I20caaf96e70898001c2b9aa698446cfe4803ea0e
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5688795
  Auto-Submit: Roman Lavrov <romanl@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/common/aligned_memory.cpp

• //
  // Copyright 2017 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // aligned_memory: An aligned memory allocator. Based on Chrome's base/memory/aligned_memory.
  //
  
  #include "common/aligned_memory.h"
  
  #include "common/debug.h"
  #include "common/platform.h"
  
  #if defined(COMPILER_MSVC)
  #    include <malloc.h>
  #else
  #    include <stdlib.h>
  #endif
  
  namespace angle
  {
  
  // Note: this could rely on std::aligned_alloc() but it has caveats, see this note and bug:
  // https://crsrc.org/c/base/memory/aligned_memory.h;drc=ae6a934f4a7cdedb3f5433ef9571d8be4b841f35;l=42
  void *AlignedAlloc(size_t size, size_t alignment)
  {
      ASSERT(size > 0);
      ASSERT((alignment & (alignment - 1)) == 0);
      ASSERT((alignment % sizeof(void *)) == 0);
      void *ptr = nullptr;
  #if defined(ANGLE_PLATFORM_WINDOWS)
      ptr = _aligned_malloc(size, alignment);
  // Android technically supports posix_memalign(), but does not expose it in
  // the current version of the library headers used by Chrome.  Luckily,
  // memalign() on Android returns pointers which can safely be used with
  // free(), so we can use it instead.  Issue filed to document this:
  // http://code.google.com/p/android/issues/detail?id=35391
  #elif defined(ANGLE_PLATFORM_ANDROID)
      ptr = memalign(alignment, size);
  #else
      if (posix_memalign(&ptr, alignment, size))
          ptr = nullptr;
  #endif
      // Since aligned allocations may fail for non-memory related reasons, force a
      // crash if we encounter a failed allocation.
      if (!ptr)
      {
          ERR() << "If you crashed here, your aligned allocation is incorrect: " << "size=" << size
                << ", alignment=" << alignment;
          ASSERT(false);
      }
      // Confidence check alignment just to be safe.
      ASSERT((reinterpret_cast<uintptr_t>(ptr) & (alignment - 1)) == 0);
      return ptr;
  }
  
  void AlignedFree(void *ptr)
  {
  #if defined(ANGLE_PLATFORM_WINDOWS)
      _aligned_free(ptr);
  #else
      free(ptr);
  #endif
  }
  
  }  // namespace angle
  

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