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 (at) google.com> 32 // 33 // This .h file imports the code that causes tcmalloc to override libc 34 // versions of malloc/free/new/delete/etc. That is, it provides the 35 // logic that makes it so calls to malloc(10) go through tcmalloc, 36 // rather than the default (libc) malloc. 37 // 38 // This file also provides a method: ReplaceSystemAlloc(), that every 39 // libc_override_*.h file it #includes is required to provide. This 40 // is called when first setting up tcmalloc -- that is, when a global 41 // constructor in tcmalloc.cc is executed -- to do any initialization 42 // work that may be required for this OS. (Note we cannot entirely 43 // control when tcmalloc is initialized, and the system may do some 44 // mallocs and frees before this routine is called.) It may be a 45 // noop. 46 // 47 // Every libc has its own way of doing this, and sometimes the compiler 48 // matters too, so we have a different file for each libc, and often 49 // for different compilers and OS's. 50 51 #ifndef TCMALLOC_LIBC_OVERRIDE_INL_H_ 52 #define TCMALLOC_LIBC_OVERRIDE_INL_H_ 53 54 #include <config.h> 55 #ifdef HAVE_FEATURES_H 56 #include <features.h> // for __GLIBC__ 57 #endif 58 #include <gperftools/tcmalloc.h> 59 60 static void ReplaceSystemAlloc(); // defined in the .h files below 61 62 // For windows, there are two ways to get tcmalloc. If we're 63 // patching, then src/windows/patch_function.cc will do the necessary 64 // overriding here. Otherwise, we doing the 'redefine' trick, where 65 // we remove malloc/new/etc from mscvcrt.dll, and just need to define 66 // them now. 67 #if defined(_WIN32) && defined(WIN32_DO_PATCHING) 68 void PatchWindowsFunctions(); // in src/windows/patch_function.cc 69 static void ReplaceSystemAlloc() { PatchWindowsFunctions(); } 70 71 #elif defined(_WIN32) && !defined(WIN32_DO_PATCHING) 72 // "libc_override_redefine.h" is included in the original gperftools. But, 73 // we define allocator functions in Chromium's base/allocator/allocator_shim.cc 74 // on Windows. We don't include libc_override_redefine.h here. 75 // ReplaceSystemAlloc() is defined here instead. 76 static void ReplaceSystemAlloc() { } 77 78 #elif defined(__APPLE__) 79 #include "libc_override_osx.h" 80 81 #elif defined(__GLIBC__) 82 #include "libc_override_glibc.h" 83 84 // Not all gcc systems necessarily support weak symbols, but all the 85 // ones I know of do, so for now just assume they all do. 86 #elif defined(__GNUC__) 87 #include "libc_override_gcc_and_weak.h" 88 89 #else 90 #error Need to add support for your libc/OS here 91 92 #endif 93 94 #endif // TCMALLOC_LIBC_OVERRIDE_INL_H_ 95
