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| 1 // Copyright (c) 2011, Google Inc. |
| 2 // All rights reserved. |
| 3 // |
| 4 // Redistribution and use in source and binary forms, with or without |
| 5 // modification, are permitted provided that the following conditions are |
| 6 // met: |
| 7 // |
| 8 // * Redistributions of source code must retain the above copyright |
| 9 // notice, this list of conditions and the following disclaimer. |
| 10 // * Redistributions in binary form must reproduce the above |
| 11 // copyright notice, this list of conditions and the following disclaimer |
| 12 // in the documentation and/or other materials provided with the |
| 13 // distribution. |
| 14 // * Neither the name of Google Inc. nor the names of its |
| 15 // contributors may be used to endorse or promote products derived from |
| 16 // this software without specific prior written permission. |
| 17 // |
| 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 |
| 30 // --- |
| 31 // Author: Craig Silverstein <opensource@google.com> |
| 32 // |
| 33 // Used to override malloc routines on systems that are using glibc. |
| 34 |
| 35 #ifndef TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_ |
| 36 #define TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_ |
| 37 |
| 38 // MALLOC_HOOK_MAYBE_VOLATILE is defined at config.h in the original gperftools. |
| 39 // Chromium does this check with the macro __MALLOC_HOOK_VOLATILE. |
| 40 // GLibc 2.14+ requires the hook functions be declared volatile, based on the |
| 41 // value of the define __MALLOC_HOOK_VOLATILE. For compatibility with |
| 42 // older/non-GLibc implementations, provide an empty definition. |
| 43 #if !defined(__MALLOC_HOOK_VOLATILE) |
| 44 #define MALLOC_HOOK_MAYBE_VOLATILE /**/ |
| 45 #else |
| 46 #define MALLOC_HOOK_MAYBE_VOLATILE __MALLOC_HOOK_VOLATILE |
| 47 #endif |
| 48 |
| 49 #include <config.h> |
| 50 #include <features.h> // for __GLIBC__ |
| 51 #ifdef HAVE_SYS_CDEFS_H |
| 52 #include <sys/cdefs.h> // for __THROW |
| 53 #endif |
| 54 #include <gperftools/tcmalloc.h> |
| 55 |
| 56 #ifndef __GLIBC__ |
| 57 # error libc_override_glibc.h is for glibc distributions only. |
| 58 #endif |
| 59 |
| 60 // In glibc, the memory-allocation methods are weak symbols, so we can |
| 61 // just override them with our own. If we're using gcc, we can use |
| 62 // __attribute__((alias)) to do the overriding easily (exception: |
| 63 // Mach-O, which doesn't support aliases). Otherwise we have to use a |
| 64 // function call. |
| 65 #if !defined(__GNUC__) || defined(__MACH__) |
| 66 |
| 67 // This also defines ReplaceSystemAlloc(). |
| 68 # include "libc_override_redefine.h" // defines functions malloc()/etc |
| 69 |
| 70 #else // #if !defined(__GNUC__) || defined(__MACH__) |
| 71 |
| 72 // If we get here, we're a gcc system, so do all the overriding we do |
| 73 // with gcc. This does the overriding of all the 'normal' memory |
| 74 // allocation. This also defines ReplaceSystemAlloc(). |
| 75 # include "libc_override_gcc_and_weak.h" |
| 76 |
| 77 // We also have to do some glibc-specific overriding. Some library |
| 78 // routines on RedHat 9 allocate memory using malloc() and free it |
| 79 // using __libc_free() (or vice-versa). Since we provide our own |
| 80 // implementations of malloc/free, we need to make sure that the |
| 81 // __libc_XXX variants (defined as part of glibc) also point to the |
| 82 // same implementations. Since it only matters for redhat, we |
| 83 // do it inside the gcc #ifdef, since redhat uses gcc. |
| 84 // TODO(csilvers): only do this if we detect we're an old enough glibc? |
| 85 |
| 86 #define ALIAS(tc_fn) __attribute__ ((alias (#tc_fn))) |
| 87 extern "C" { |
| 88 void* __libc_malloc(size_t size) ALIAS(tc_malloc); |
| 89 void __libc_free(void* ptr) ALIAS(tc_free); |
| 90 void* __libc_realloc(void* ptr, size_t size) ALIAS(tc_realloc); |
| 91 void* __libc_calloc(size_t n, size_t size) ALIAS(tc_calloc); |
| 92 void __libc_cfree(void* ptr) ALIAS(tc_cfree); |
| 93 void* __libc_memalign(size_t align, size_t s) ALIAS(tc_memalign); |
| 94 void* __libc_valloc(size_t size) ALIAS(tc_valloc); |
| 95 void* __libc_pvalloc(size_t size) ALIAS(tc_pvalloc); |
| 96 int __posix_memalign(void** r, size_t a, size_t s) ALIAS(tc_posix_memalign); |
| 97 } // extern "C" |
| 98 #undef ALIAS |
| 99 |
| 100 #endif // #if defined(__GNUC__) && !defined(__MACH__) |
| 101 |
| 102 |
| 103 // We also have to hook libc malloc. While our work with weak symbols |
| 104 // should make sure libc malloc is never called in most situations, it |
| 105 // can be worked around by shared libraries with the DEEPBIND |
| 106 // environment variable set. The below hooks libc to call our malloc |
| 107 // routines even in that situation. In other situations, this hook |
| 108 // should never be called. |
| 109 extern "C" { |
| 110 static void* glibc_override_malloc(size_t size, const void *caller) { |
| 111 return tc_malloc(size); |
| 112 } |
| 113 static void* glibc_override_realloc(void *ptr, size_t size, |
| 114 const void *caller) { |
| 115 return tc_realloc(ptr, size); |
| 116 } |
| 117 static void glibc_override_free(void *ptr, const void *caller) { |
| 118 tc_free(ptr); |
| 119 } |
| 120 static void* glibc_override_memalign(size_t align, size_t size, |
| 121 const void *caller) { |
| 122 return tc_memalign(align, size); |
| 123 } |
| 124 |
| 125 // We should be using __malloc_initialize_hook here, like the #if 0 |
| 126 // code below. (See http://swoolley.org/man.cgi/3/malloc_hook.) |
| 127 // However, this causes weird linker errors with programs that link |
| 128 // with -static, so instead we just assign the vars directly at |
| 129 // static-constructor time. That should serve the same effect of |
| 130 // making sure the hooks are set before the first malloc call the |
| 131 // program makes. |
| 132 #if 0 |
| 133 #include <malloc.h> // for __malloc_hook, etc. |
| 134 void glibc_override_malloc_init_hook(void) { |
| 135 __malloc_hook = glibc_override_malloc; |
| 136 __realloc_hook = glibc_override_realloc; |
| 137 __free_hook = glibc_override_free; |
| 138 __memalign_hook = glibc_override_memalign; |
| 139 } |
| 140 |
| 141 void (* MALLOC_HOOK_MAYBE_VOLATILE __malloc_initialize_hook)(void) |
| 142 = &glibc_override_malloc_init_hook; |
| 143 #endif |
| 144 |
| 145 void* (* MALLOC_HOOK_MAYBE_VOLATILE __malloc_hook)(size_t, const void*) |
| 146 = &glibc_override_malloc; |
| 147 void* (* MALLOC_HOOK_MAYBE_VOLATILE __realloc_hook)(void*, size_t, const void*) |
| 148 = &glibc_override_realloc; |
| 149 void (* MALLOC_HOOK_MAYBE_VOLATILE __free_hook)(void*, const void*) |
| 150 = &glibc_override_free; |
| 151 void* (* MALLOC_HOOK_MAYBE_VOLATILE __memalign_hook)(size_t,size_t, const void*) |
| 152 = &glibc_override_memalign; |
| 153 |
| 154 } // extern "C" |
| 155 |
| 156 // No need to write ReplaceSystemAlloc(); one of the #includes above |
| 157 // did it for us. |
| 158 |
| 159 #endif // TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_ |
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