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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 */ | |
Nico
2016/04/08 20:23:07
can't these entries just be __real_malloc and frie
Primiano Tucci (use gerrit)
2016/04/11 13:49:14
The actual reason is that RealMalloc & co method s
| |
52 &RealCalloc, /* alloc_zero_initialized_function */ | |
53 &RealMemalign, /* alloc_aligned_function */ | |
54 &RealRealloc, /* realloc_function */ | |
55 &RealFree, /* free_function */ | |
56 nullptr, /* next */ | |
Nico
2016/04/08 20:23:07
nit: align
Primiano Tucci (use gerrit)
2016/04/11 13:49:14
Oops. Done
| |
57 }; | |
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