1 // Copyright 2016 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/allocator/allocator_shim.h" 6 7 // This translation unit defines a default dispatch for the allocator shim which 8 // routes allocations to the original libc functions when using the link-time 9 // -Wl,-wrap,malloc approach (see README.md). 10 // The __real_X functions here are special symbols that the linker will relocate 11 // against the real "X" undefined symbol, so that __real_malloc becomes the 12 // equivalent of what an undefined malloc symbol reference would have been. 13 // This is the counterpart of allocator_shim_override_linker_wrapped_symbols.h, 14 // which routes the __wrap_X functions into the shim. 15 16 extern "C" { 17 void* __real_malloc(size_t); 18 void* __real_calloc(size_t, size_t); 19 void* __real_realloc(void*, size_t); 20 void* __real_memalign(size_t, size_t); 21 void* __real_free(void*); 22 } // extern "C" 23 24 namespace { 25 26 using base::allocator::AllocatorDispatch; 27 28 void* RealMalloc(const AllocatorDispatch*, size_t size) { 29 return __real_malloc(size); 30 } 31 32 void* RealCalloc(const AllocatorDispatch*, size_t n, size_t size) { 33 return __real_calloc(n, size); 34 } 35 36 void* RealRealloc(const AllocatorDispatch*, void* address, size_t size) { 37 return __real_realloc(address, size); 38 } 39 40 void* RealMemalign(const AllocatorDispatch*, size_t alignment, size_t size) { 41 return __real_memalign(alignment, size); 42 } 43 44 void RealFree(const AllocatorDispatch*, void* address) { 45 __real_free(address); 46 } 47 48 } // namespace 49 50 const AllocatorDispatch AllocatorDispatch::default_dispatch = { 51 &RealMalloc, /* alloc_function */ 52 &RealCalloc, /* alloc_zero_initialized_function */ 53 &RealMemalign, /* alloc_aligned_function */ 54 &RealRealloc, /* realloc_function */ 55 &RealFree, /* free_function */ 56 nullptr, /* next */ 57 }; 58
