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105 lines
4.5 KiB
C
105 lines
4.5 KiB
C
// Copyright (c) 2011, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ---
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// Author: Craig Silverstein <opensource@google.com>
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//
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// This .h file imports the code that causes tcmalloc to override libc
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// versions of malloc/free/new/delete/etc. That is, it provides the
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// logic that makes it so calls to malloc(10) go through tcmalloc,
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// rather than the default (libc) malloc.
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//
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// This file also provides a method: ReplaceSystemAlloc(), that every
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// libc_override_*.h file it #includes is required to provide. This
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// is called when first setting up tcmalloc -- that is, when a global
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// constructor in tcmalloc.cc is executed -- to do any initialization
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// work that may be required for this OS. (Note we cannot entirely
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// control when tcmalloc is initialized, and the system may do some
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// mallocs and frees before this routine is called.) It may be a
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// noop.
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//
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// Every libc has its own way of doing this, and sometimes the compiler
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// matters too, so we have a different file for each libc, and often
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// for different compilers and OS's.
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#ifndef TCMALLOC_LIBC_OVERRIDE_INL_H_
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#define TCMALLOC_LIBC_OVERRIDE_INL_H_
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#include <config.h>
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#ifdef HAVE_FEATURES_H
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#include <features.h> // for __GLIBC__
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#endif
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#include <gperftools/tcmalloc.h>
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static void ReplaceSystemAlloc(); // defined in the .h files below
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#if defined(TCMALLOC_DONT_REPLACE_SYSTEM_ALLOC)
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// TCMALLOC_DONT_REPLACE_SYSTEM_ALLOC has the following semantic:
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// - tcmalloc with all its tc_* (tc_malloc, tc_free) symbols is being built
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// and linked as usual.
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// - the default system allocator symbols (malloc, free, operator new) are NOT
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// overridden. The embedded must take care of routing them to tc_* symbols.
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// This no-op #if block effectively prevents the inclusion of the
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// libc_override_* headers below.
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static void ReplaceSystemAlloc() {}
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// For windows, there are two ways to get tcmalloc. If we're
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// patching, then src/windows/patch_function.cc will do the necessary
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// overriding here. Otherwise, we doing the 'redefine' trick, where
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// we remove malloc/new/etc from mscvcrt.dll, and just need to define
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// them now.
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#elif defined(_WIN32) && defined(WIN32_DO_PATCHING)
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void PatchWindowsFunctions(); // in src/windows/patch_function.cc
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static void ReplaceSystemAlloc() { PatchWindowsFunctions(); }
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#elif defined(_WIN32) && !defined(WIN32_DO_PATCHING)
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// "libc_override_redefine.h" is included in the original gperftools. But,
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// we define allocator functions in Chromium's base/allocator/allocator_shim.cc
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// on Windows. We don't include libc_override_redefine.h here.
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// ReplaceSystemAlloc() is defined here instead.
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static void ReplaceSystemAlloc() { }
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#elif defined(__APPLE__)
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#include "libc_override_osx.h"
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#elif defined(__GLIBC__)
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#include "libc_override_glibc.h"
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// Not all gcc systems necessarily support weak symbols, but all the
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// ones I know of do, so for now just assume they all do.
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#elif defined(__GNUC__)
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#include "libc_override_gcc_and_weak.h"
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#else
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#error Need to add support for your libc/OS here
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#endif
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#endif // TCMALLOC_LIBC_OVERRIDE_INL_H_
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