fx_memory.cpp

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// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
#include "core/fxcrt/fx_memory.h"
 
#include <stdlib.h>  // For abort().
 
#include <iterator>
#include <limits>
 
#include "build/build_config.h"
#include "third_party/base/debug/alias.h"
 
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#endif
 
void* FXMEM_DefaultAlloc(size_t byte_size) {
  return pdfium::internal::Alloc(byte_size, 1);
}
 
void* FXMEM_DefaultCalloc(size_t num_elems, size_t byte_size) {
  return pdfium::internal::Calloc(num_elems, byte_size);
}
 
void* FXMEM_DefaultRealloc(void* pointer, size_t new_size) {
  return pdfium::internal::Realloc(pointer, new_size, 1);
}
 
void FXMEM_DefaultFree(void* pointer) {
  FX_Free(pointer);
}
 
NOINLINE void FX_OutOfMemoryTerminate(size_t size) {
  // Convince the linker this should not be folded with similar functions using
  // Identical Code Folding.
  static int make_this_function_aliased = 0xbd;
  pdfium::base::debug::Alias(&make_this_function_aliased);
 
#if BUILDFLAG(IS_WIN)
  // The same custom Windows exception code used in Chromium and Breakpad.
  constexpr DWORD kOomExceptionCode = 0xe0000008;
  ULONG_PTR exception_args[] = {size};
  ::RaiseException(kOomExceptionCode, EXCEPTION_NONCONTINUABLE,
                   std::size(exception_args), exception_args);
#endif
 
  // Terminate cleanly.
  abort();
}
 
namespace pdfium::internal {
 
void* AllocOrDie(size_t num_members, size_t member_size) {
  void* result = Alloc(num_members, member_size);
  if (!result)
    FX_OutOfMemoryTerminate(0);  // Never returns.
 
  return result;
}
 
void* AllocOrDie2D(size_t w, size_t h, size_t member_size) {
  if (w >= std::numeric_limits<size_t>::max() / h)
    FX_OutOfMemoryTerminate(0);  // Never returns.
 
  return AllocOrDie(w * h, member_size);
}
void* CallocOrDie(size_t num_members, size_t member_size) {
  void* result = Calloc(num_members, member_size);
  if (!result)
    FX_OutOfMemoryTerminate(0);  // Never returns.
 
  return result;
}
 
void* CallocOrDie2D(size_t w, size_t h, size_t member_size) {
  if (w >= std::numeric_limits<size_t>::max() / h)
    FX_OutOfMemoryTerminate(0);  // Never returns.
 
  return CallocOrDie(w * h, member_size);
}
 
void* ReallocOrDie(void* ptr, size_t num_members, size_t member_size) {
  void* result = Realloc(ptr, num_members, member_size);
  if (!result)
    FX_OutOfMemoryTerminate(0);  // Never returns.
 
  return result;
}
 
void* StringAllocOrDie(size_t num_members, size_t member_size) {
  void* result = StringAlloc(num_members, member_size);
  if (!result)
    FX_OutOfMemoryTerminate(0);  // Never returns.
 
  return result;
}
 
}  // namespace pdfium::internal