| // Copyright (c) 2011, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // --- |
| // Author: Craig Silverstein <opensource@google.com> |
| // |
| // Used to override malloc routines on systems that are using glibc. |
| |
| #ifndef TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_ |
| #define TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_ |
| |
| #include <config.h> |
| #include <features.h> // for __GLIBC__ |
| #ifdef HAVE_SYS_CDEFS_H |
| #include <sys/cdefs.h> // for __THROW |
| #endif |
| #include <gperftools/tcmalloc.h> |
| |
| #ifndef __GLIBC__ |
| # error libc_override_glibc.h is for glibc distributions only. |
| #endif |
| |
| // In glibc, the memory-allocation methods are weak symbols, so we can |
| // just override them with our own. If we're using gcc, we can use |
| // __attribute__((alias)) to do the overriding easily (exception: |
| // Mach-O, which doesn't support aliases). Otherwise we have to use a |
| // function call. |
| #if !defined(__GNUC__) || defined(__MACH__) |
| |
| // This also defines ReplaceSystemAlloc(). |
| # include "libc_override_redefine.h" // defines functions malloc()/etc |
| |
| #else // #if !defined(__GNUC__) || defined(__MACH__) |
| |
| // If we get here, we're a gcc system, so do all the overriding we do |
| // with gcc. This does the overriding of all the 'normal' memory |
| // allocation. This also defines ReplaceSystemAlloc(). |
| # include "libc_override_gcc_and_weak.h" |
| |
| // We also have to do some glibc-specific overriding. Some library |
| // routines on RedHat 9 allocate memory using malloc() and free it |
| // using __libc_free() (or vice-versa). Since we provide our own |
| // implementations of malloc/free, we need to make sure that the |
| // __libc_XXX variants (defined as part of glibc) also point to the |
| // same implementations. Since it only matters for redhat, we |
| // do it inside the gcc #ifdef, since redhat uses gcc. |
| // TODO(csilvers): only do this if we detect we're an old enough glibc? |
| |
| #define ALIAS(tc_fn) __attribute__ ((alias (#tc_fn))) |
| extern "C" { |
| void* __libc_malloc(size_t size) ALIAS(tc_malloc); |
| void __libc_free(void* ptr) ALIAS(tc_free); |
| void* __libc_realloc(void* ptr, size_t size) ALIAS(tc_realloc); |
| void* __libc_calloc(size_t n, size_t size) ALIAS(tc_calloc); |
| void __libc_cfree(void* ptr) ALIAS(tc_cfree); |
| void* __libc_memalign(size_t align, size_t s) ALIAS(tc_memalign); |
| void* __libc_valloc(size_t size) ALIAS(tc_valloc); |
| void* __libc_pvalloc(size_t size) ALIAS(tc_pvalloc); |
| int __posix_memalign(void** r, size_t a, size_t s) ALIAS(tc_posix_memalign); |
| } // extern "C" |
| #undef ALIAS |
| |
| #endif // #if defined(__GNUC__) && !defined(__MACH__) |
| |
| |
| // We also have to hook libc malloc. While our work with weak symbols |
| // should make sure libc malloc is never called in most situations, it |
| // can be worked around by shared libraries with the DEEPBIND |
| // environment variable set. The below hooks libc to call our malloc |
| // routines even in that situation. In other situations, this hook |
| // should never be called. |
| extern "C" { |
| static void* glibc_override_malloc(size_t size, const void *caller) { |
| return tc_malloc(size); |
| } |
| static void* glibc_override_realloc(void *ptr, size_t size, |
| const void *caller) { |
| return tc_realloc(ptr, size); |
| } |
| static void glibc_override_free(void *ptr, const void *caller) { |
| tc_free(ptr); |
| } |
| static void* glibc_override_memalign(size_t align, size_t size, |
| const void *caller) { |
| return tc_memalign(align, size); |
| } |
| |
| // We should be using __malloc_initialize_hook here, like the #if 0 |
| // code below. (See http://swoolley.org/man.cgi/3/malloc_hook.) |
| // However, this causes weird linker errors with programs that link |
| // with -static, so instead we just assign the vars directly at |
| // static-constructor time. That should serve the same effect of |
| // making sure the hooks are set before the first malloc call the |
| // program makes. |
| #if 0 |
| #include <malloc.h> // for __malloc_hook, etc. |
| void glibc_override_malloc_init_hook(void) { |
| __malloc_hook = glibc_override_malloc; |
| __realloc_hook = glibc_override_realloc; |
| __free_hook = glibc_override_free; |
| __memalign_hook = glibc_override_memalign; |
| } |
| |
| void (* MALLOC_HOOK_MAYBE_VOLATILE __malloc_initialize_hook)(void) |
| = &glibc_override_malloc_init_hook; |
| #endif |
| |
| void* (* MALLOC_HOOK_MAYBE_VOLATILE __malloc_hook)(size_t, const void*) |
| = &glibc_override_malloc; |
| void* (* MALLOC_HOOK_MAYBE_VOLATILE __realloc_hook)(void*, size_t, const void*) |
| = &glibc_override_realloc; |
| void (* MALLOC_HOOK_MAYBE_VOLATILE __free_hook)(void*, const void*) |
| = &glibc_override_free; |
| void* (* MALLOC_HOOK_MAYBE_VOLATILE __memalign_hook)(size_t,size_t, const void*) |
| = &glibc_override_memalign; |
| |
| } // extern "C" |
| |
| // No need to write ReplaceSystemAlloc(); one of the #includes above |
| // did it for us. |
| |
| #endif // TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_ |