| // 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> |
| // |
| // This .h file imports the code that causes tcmalloc to override libc |
| // versions of malloc/free/new/delete/etc. That is, it provides the |
| // logic that makes it so calls to malloc(10) go through tcmalloc, |
| // rather than the default (libc) malloc. |
| // |
| // This file also provides a method: ReplaceSystemAlloc(), that every |
| // libc_override_*.h file it #includes is required to provide. This |
| // is called when first setting up tcmalloc -- that is, when a global |
| // constructor in tcmalloc.cc is executed -- to do any initialization |
| // work that may be required for this OS. (Note we cannot entirely |
| // control when tcmalloc is initialized, and the system may do some |
| // mallocs and frees before this routine is called.) It may be a |
| // noop. |
| // |
| // Every libc has its own way of doing this, and sometimes the compiler |
| // matters too, so we have a different file for each libc, and often |
| // for different compilers and OS's. |
| |
| #ifndef TCMALLOC_LIBC_OVERRIDE_INL_H_ |
| #define TCMALLOC_LIBC_OVERRIDE_INL_H_ |
| |
| #include <config.h> |
| #ifdef HAVE_FEATURES_H |
| #include <features.h> // for __GLIBC__ |
| #endif |
| #include <gperftools/tcmalloc.h> |
| |
| static void ReplaceSystemAlloc(); // defined in the .h files below |
| |
| #if defined(TCMALLOC_DONT_REPLACE_SYSTEM_ALLOC) |
| // TCMALLOC_DONT_REPLACE_SYSTEM_ALLOC has the following semantic: |
| // - tcmalloc with all its tc_* (tc_malloc, tc_free) symbols is being built |
| // and linked as usual. |
| // - the default system allocator symbols (malloc, free, operator new) are NOT |
| // overridden. The embedded must take care of routing them to tc_* symbols. |
| // This no-op #if block effectively prevents the inclusion of the |
| // libc_override_* headers below. |
| static void ReplaceSystemAlloc() {} |
| |
| // For windows, there are two ways to get tcmalloc. If we're |
| // patching, then src/windows/patch_function.cc will do the necessary |
| // overriding here. Otherwise, we doing the 'redefine' trick, where |
| // we remove malloc/new/etc from mscvcrt.dll, and just need to define |
| // them now. |
| #elif defined(_WIN32) && defined(WIN32_DO_PATCHING) |
| void PatchWindowsFunctions(); // in src/windows/patch_function.cc |
| static void ReplaceSystemAlloc() { PatchWindowsFunctions(); } |
| |
| #elif defined(_WIN32) && !defined(WIN32_DO_PATCHING) |
| // "libc_override_redefine.h" is included in the original gperftools. But, |
| // we define allocator functions in Chromium's base/allocator/allocator_shim.cc |
| // on Windows. We don't include libc_override_redefine.h here. |
| // ReplaceSystemAlloc() is defined here instead. |
| static void ReplaceSystemAlloc() { } |
| |
| #elif defined(__APPLE__) |
| #include "libc_override_osx.h" |
| |
| #elif defined(__GLIBC__) |
| #include "libc_override_glibc.h" |
| |
| // Not all gcc systems necessarily support weak symbols, but all the |
| // ones I know of do, so for now just assume they all do. |
| #elif defined(__GNUC__) |
| #include "libc_override_gcc_and_weak.h" |
| |
| #else |
| #error Need to add support for your libc/OS here |
| |
| #endif |
| |
| #endif // TCMALLOC_LIBC_OVERRIDE_INL_H_ |
