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| 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@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_ |
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