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1 // Copyright (c) 2011, Google Inc. | 1 // Copyright (c) 2011, Google Inc. |
2 // All rights reserved. | 2 // All rights reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions are | 5 // modification, are permitted provided that the following conditions are |
6 // met: | 6 // met: |
7 // | 7 // |
8 // * Redistributions of source code must retain the above copyright | 8 // * Redistributions of source code must retain the above copyright |
9 // notice, this list of conditions and the following disclaimer. | 9 // notice, this list of conditions and the following disclaimer. |
10 // * Redistributions in binary form must reproduce the above | 10 // * Redistributions in binary form must reproduce the above |
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52 #define TCMALLOC_LIBC_OVERRIDE_INL_H_ | 52 #define TCMALLOC_LIBC_OVERRIDE_INL_H_ |
53 | 53 |
54 #include <config.h> | 54 #include <config.h> |
55 #ifdef HAVE_FEATURES_H | 55 #ifdef HAVE_FEATURES_H |
56 #include <features.h> // for __GLIBC__ | 56 #include <features.h> // for __GLIBC__ |
57 #endif | 57 #endif |
58 #include <gperftools/tcmalloc.h> | 58 #include <gperftools/tcmalloc.h> |
59 | 59 |
60 static void ReplaceSystemAlloc(); // defined in the .h files below | 60 static void ReplaceSystemAlloc(); // defined in the .h files below |
61 | 61 |
62 #if defined(TCMALLOC_DONT_REPLACE_SYSTEM_ALLOC) | |
63 // TCMALLOC_DONT_REPLACE_SYSTEM_ALLOC has the following semantic: | |
64 // - tcmalloc with all its tc_* (tc_malloc, tc_free) symbols is being built | |
65 // and linked as usual. | |
66 // - the default system allocator symbols (malloc, free, operator new) are NOT | |
67 // overridden. The embedded must take care of routing them to tc_* symbols. | |
68 // This no-op #if block effectively prevents the inclusion of the | |
69 // libc_override_* headers below. | |
70 static void ReplaceSystemAlloc() {} | |
Nico
2016/02/09 20:14:23
Which files include this? Defining static function
Primiano Tucci (use gerrit)
2016/02/09 20:34:23
So I think that the deal is that this header is a
| |
71 | |
62 // For windows, there are two ways to get tcmalloc. If we're | 72 // For windows, there are two ways to get tcmalloc. If we're |
63 // patching, then src/windows/patch_function.cc will do the necessary | 73 // patching, then src/windows/patch_function.cc will do the necessary |
64 // overriding here. Otherwise, we doing the 'redefine' trick, where | 74 // overriding here. Otherwise, we doing the 'redefine' trick, where |
65 // we remove malloc/new/etc from mscvcrt.dll, and just need to define | 75 // we remove malloc/new/etc from mscvcrt.dll, and just need to define |
66 // them now. | 76 // them now. |
67 #if defined(_WIN32) && defined(WIN32_DO_PATCHING) | 77 #elif defined(_WIN32) && defined(WIN32_DO_PATCHING) |
68 void PatchWindowsFunctions(); // in src/windows/patch_function.cc | 78 void PatchWindowsFunctions(); // in src/windows/patch_function.cc |
69 static void ReplaceSystemAlloc() { PatchWindowsFunctions(); } | 79 static void ReplaceSystemAlloc() { PatchWindowsFunctions(); } |
70 | 80 |
71 #elif defined(_WIN32) && !defined(WIN32_DO_PATCHING) | 81 #elif defined(_WIN32) && !defined(WIN32_DO_PATCHING) |
72 // "libc_override_redefine.h" is included in the original gperftools. But, | 82 // "libc_override_redefine.h" is included in the original gperftools. But, |
73 // we define allocator functions in Chromium's base/allocator/allocator_shim.cc | 83 // we define allocator functions in Chromium's base/allocator/allocator_shim.cc |
74 // on Windows. We don't include libc_override_redefine.h here. | 84 // on Windows. We don't include libc_override_redefine.h here. |
75 // ReplaceSystemAlloc() is defined here instead. | 85 // ReplaceSystemAlloc() is defined here instead. |
76 static void ReplaceSystemAlloc() { } | 86 static void ReplaceSystemAlloc() { } |
77 | 87 |
78 #elif defined(__APPLE__) | 88 #elif defined(__APPLE__) |
79 #include "libc_override_osx.h" | 89 #include "libc_override_osx.h" |
80 | 90 |
81 #elif defined(__GLIBC__) | 91 #elif defined(__GLIBC__) |
82 #include "libc_override_glibc.h" | 92 #include "libc_override_glibc.h" |
83 | 93 |
84 // Not all gcc systems necessarily support weak symbols, but all the | 94 // Not all gcc systems necessarily support weak symbols, but all the |
85 // ones I know of do, so for now just assume they all do. | 95 // ones I know of do, so for now just assume they all do. |
86 #elif defined(__GNUC__) | 96 #elif defined(__GNUC__) |
87 #include "libc_override_gcc_and_weak.h" | 97 #include "libc_override_gcc_and_weak.h" |
88 | 98 |
89 #else | 99 #else |
90 #error Need to add support for your libc/OS here | 100 #error Need to add support for your libc/OS here |
91 | 101 |
92 #endif | 102 #endif |
93 | 103 |
94 #endif // TCMALLOC_LIBC_OVERRIDE_INL_H_ | 104 #endif // TCMALLOC_LIBC_OVERRIDE_INL_H_ |
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