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- // 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.
- #include <malloc.h>
- #include "base/allocator/allocator_shim.h"
- #include "build/build_config.h"
- // This translation unit defines a default dispatch for the allocator shim which
- // routes allocations to the original libc functions when using the link-time
- // -Wl,-wrap,malloc approach (see README.md).
- // The __real_X functions here are special symbols that the linker will relocate
- // against the real "X" undefined symbol, so that __real_malloc becomes the
- // equivalent of what an undefined malloc symbol reference would have been.
- // This is the counterpart of allocator_shim_override_linker_wrapped_symbols.h,
- // which routes the __wrap_X functions into the shim.
- extern "C" {
- void* __real_malloc(size_t);
- void* __real_calloc(size_t, size_t);
- void* __real_realloc(void*, size_t);
- void* __real_memalign(size_t, size_t);
- void __real_free(void*);
- size_t __real_malloc_usable_size(void*);
- } // extern "C"
- namespace {
- using base::allocator::AllocatorDispatch;
- void* RealMalloc(const AllocatorDispatch*, size_t size, void* context) {
- return __real_malloc(size);
- }
- void* RealCalloc(const AllocatorDispatch*,
- size_t n,
- size_t size,
- void* context) {
- return __real_calloc(n, size);
- }
- void* RealRealloc(const AllocatorDispatch*,
- void* address,
- size_t size,
- void* context) {
- return __real_realloc(address, size);
- }
- void* RealMemalign(const AllocatorDispatch*,
- size_t alignment,
- size_t size,
- void* context) {
- return __real_memalign(alignment, size);
- }
- void RealFree(const AllocatorDispatch*, void* address, void* context) {
- __real_free(address);
- }
- size_t RealSizeEstimate(const AllocatorDispatch*,
- void* address,
- void* context) {
- return __real_malloc_usable_size(address);
- }
- } // namespace
- const AllocatorDispatch AllocatorDispatch::default_dispatch = {
- &RealMalloc, /* alloc_function */
- &RealMalloc, /* alloc_unchecked_function */
- &RealCalloc, /* alloc_zero_initialized_function */
- &RealMemalign, /* alloc_aligned_function */
- &RealRealloc, /* realloc_function */
- &RealFree, /* free_function */
- &RealSizeEstimate, /* get_size_estimate_function */
- nullptr, /* batch_malloc_function */
- nullptr, /* batch_free_function */
- nullptr, /* free_definite_size_function */
- nullptr, /* aligned_malloc_function */
- nullptr, /* aligned_realloc_function */
- nullptr, /* aligned_free_function */
- nullptr, /* next */
- };
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