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- // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
- // 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__
- #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_
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