| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // This header defines symbols to override the same functions in the Visual C++ |
| // CRT implementation. |
| |
| #ifdef BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_UCRT_SYMBOLS_WIN_H_ |
| #error This header is meant to be included only once by allocator_shim.cc |
| #endif |
| #define BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_UCRT_SYMBOLS_WIN_H_ |
| |
| #include <malloc.h> |
| |
| #include <windows.h> |
| |
| extern "C" { |
| |
| void* (*malloc_unchecked)(size_t) = &base::allocator::UncheckedAlloc; |
| |
| namespace { |
| |
| int win_new_mode = 0; |
| |
| } // namespace |
| |
| // This function behaves similarly to MSVC's _set_new_mode. |
| // If flag is 0 (default), calls to malloc will behave normally. |
| // If flag is 1, calls to malloc will behave like calls to new, |
| // and the std_new_handler will be invoked on failure. |
| // Returns the previous mode. |
| // |
| // Replaces _set_new_mode in ucrt\heap\new_mode.cpp |
| int _set_new_mode(int flag) { |
| // The MS CRT calls this function early on in startup, so this serves as a low |
| // overhead proof that the allocator shim is in place for this process. |
| base::allocator::g_is_win_shim_layer_initialized = true; |
| int old_mode = win_new_mode; |
| win_new_mode = flag; |
| |
| base::allocator::SetCallNewHandlerOnMallocFailure(win_new_mode != 0); |
| |
| return old_mode; |
| } |
| |
| // Replaces _query_new_mode in ucrt\heap\new_mode.cpp |
| int _query_new_mode() { |
| return win_new_mode; |
| } |
| |
| // These symbols override the CRT's implementation of the same functions. |
| __declspec(restrict) void* malloc(size_t size) { |
| return ShimMalloc(size, nullptr); |
| } |
| |
| void free(void* ptr) { |
| ShimFree(ptr, nullptr); |
| } |
| |
| __declspec(restrict) void* realloc(void* ptr, size_t size) { |
| return ShimRealloc(ptr, size, nullptr); |
| } |
| |
| __declspec(restrict) void* calloc(size_t n, size_t size) { |
| return ShimCalloc(n, size, nullptr); |
| } |
| |
| // _msize() is the Windows equivalent of malloc_size(). |
| size_t _msize(void* memblock) { |
| return ShimGetSizeEstimate(memblock, nullptr); |
| } |
| |
| __declspec(restrict) void* _aligned_malloc(size_t size, size_t alignment) { |
| return ShimAlignedMalloc(size, alignment, nullptr); |
| } |
| |
| __declspec(restrict) void* _aligned_realloc(void* address, |
| size_t size, |
| size_t alignment) { |
| return ShimAlignedRealloc(address, size, alignment, nullptr); |
| } |
| |
| void _aligned_free(void* address) { |
| ShimAlignedFree(address, nullptr); |
| } |
| |
| // _recalloc_base is called by CRT internally. |
| __declspec(restrict) void* _recalloc_base(void* block, |
| size_t count, |
| size_t size) { |
| const size_t old_block_size = (block != nullptr) ? _msize(block) : 0; |
| base::CheckedNumeric<size_t> new_block_size_checked = count; |
| new_block_size_checked *= size; |
| const size_t new_block_size = new_block_size_checked.ValueOrDie(); |
| |
| void* const new_block = realloc(block, new_block_size); |
| |
| if (new_block != nullptr && old_block_size < new_block_size) { |
| memset(static_cast<char*>(new_block) + old_block_size, 0, |
| new_block_size - old_block_size); |
| } |
| |
| return new_block; |
| } |
| |
| __declspec(restrict) void* _recalloc(void* block, size_t count, size_t size) { |
| return _recalloc_base(block, count, size); |
| } |
| |
| // The following uncommon _aligned_* routines are not used in Chromium and have |
| // been shimmed to immediately crash to ensure that implementations are added if |
| // uses are introduced. |
| __declspec(restrict) void* _aligned_recalloc(void* address, |
| size_t num, |
| size_t size, |
| size_t alignment) { |
| CHECK(false) << "This routine has not been implemented"; |
| __builtin_unreachable(); |
| } |
| |
| size_t _aligned_msize(void* address, size_t alignment, size_t offset) { |
| CHECK(false) << "This routine has not been implemented"; |
| __builtin_unreachable(); |
| } |
| |
| __declspec(restrict) void* _aligned_offset_malloc(size_t size, |
| size_t alignment, |
| size_t offset) { |
| CHECK(false) << "This routine has not been implemented"; |
| __builtin_unreachable(); |
| } |
| |
| __declspec(restrict) void* _aligned_offset_realloc(void* address, |
| size_t size, |
| size_t alignment, |
| size_t offset) { |
| CHECK(false) << "This routine has not been implemented"; |
| __builtin_unreachable(); |
| } |
| |
| __declspec(restrict) void* _aligned_offset_recalloc(void* address, |
| size_t num, |
| size_t size, |
| size_t alignment, |
| size_t offset) { |
| CHECK(false) << "This routine has not been implemented"; |
| __builtin_unreachable(); |
| } |
| |
| // The symbols |
| // * __acrt_heap |
| // * __acrt_initialize_heap |
| // * __acrt_uninitialize_heap |
| // * _get_heap_handle |
| // must be overridden all or none, as they are otherwise supplied |
| // by heap_handle.obj in the ucrt.lib file. |
| HANDLE __acrt_heap = nullptr; |
| |
| bool __acrt_initialize_heap() { |
| __acrt_heap = ::HeapCreate(0, 0, 0); |
| return true; |
| } |
| |
| bool __acrt_uninitialize_heap() { |
| ::HeapDestroy(__acrt_heap); |
| __acrt_heap = nullptr; |
| return true; |
| } |
| |
| intptr_t _get_heap_handle(void) { |
| return reinterpret_cast<intptr_t>(__acrt_heap); |
| } |
| |
| } // extern "C" |