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BeefRT/gperftools/src/libc_override.h

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+// 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
+
+// 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.
+#if 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)
+#include "libc_override_redefine.h"
+
+#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_