diff options
Diffstat (limited to 'src/third_party/gperftools-2.7/src/libc_override_glibc.h')
| -rw-r--r-- | src/third_party/gperftools-2.7/src/libc_override_glibc.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/third_party/gperftools-2.7/src/libc_override_glibc.h b/src/third_party/gperftools-2.7/src/libc_override_glibc.h new file mode 100644 index 00000000000..32692132a38 --- /dev/null +++ b/src/third_party/gperftools-2.7/src/libc_override_glibc.h @@ -0,0 +1,92 @@ +// -*- 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__) + +// No need to write ReplaceSystemAlloc(); one of the #includes above +// did it for us. + +#endif // TCMALLOC_LIBC_OVERRIDE_GLIBC_INL_H_ |