third_party/tcmalloc/chromium/src/malloc_hook-inl.h - monet - Git at Google

 // Copyright (c) 2005, 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: Sanjay Ghemawat
 //
 // This has the implementation details of malloc_hook that are needed
 // to use malloc-hook inside the tcmalloc system.  It does not hold
 // any of the client-facing calls that are used to add new hooks.

 #ifndef _MALLOC_HOOK_INL_H_
 #define _MALLOC_HOOK_INL_H_

 #include <stddef.h>
 #include <sys/types.h>
 #include "base/atomicops.h"
 #include "base/basictypes.h"
 #include <gperftools/malloc_hook.h>

 namespace base { namespace internal {

 // The following (implementation) code is DEPRECATED.
 // A simple atomic pointer class that can be initialized by the linker
 // when you define a namespace-scope variable as:
 //
 //   AtomicPtr<Foo*> my_global = { &initial_value };
 //
 // This isn't suitable for a general atomic<> class because of the
 // public access to data_.
 template<typename PtrT>
 class AtomicPtr {
  public:
   COMPILE_ASSERT(sizeof(PtrT) <= sizeof(AtomicWord),
                  PtrT_should_fit_in_AtomicWord);

   PtrT Get() const {
     // Depending on the system, Acquire_Load(AtomicWord*) may have
     // been defined to return an AtomicWord, Atomic32, or Atomic64.
     // We hide that implementation detail here with an explicit cast.
     // This prevents MSVC 2005, at least, from complaining (it has to
     // do with __wp64; AtomicWord is __wp64, but Atomic32/64 aren't).
     return reinterpret_cast<PtrT>(static_cast<AtomicWord>(
       base::subtle::Acquire_Load(&data_)));
   }

   // Sets the contained value to new_val and returns the old value,
   // atomically, with acquire and release semantics.
   // This is a full-barrier instruction.
   PtrT Exchange(PtrT new_val);

   // Atomically executes:
   //      result = data_
   //      if (data_ == old_val)
   //        data_ = new_val;
   //      return result;
   // This is a full-barrier instruction.
   PtrT CompareAndSwap(PtrT old_val, PtrT new_val);

   // Not private so that the class is an aggregate and can be
   // initialized by the linker. Don't access this directly.
   AtomicWord data_;
 };

 // These are initialized in malloc_hook.cc
 extern AtomicPtr<MallocHook::NewHook>     new_hook_;
 extern AtomicPtr<MallocHook::DeleteHook>  delete_hook_;
 extern AtomicPtr<MallocHook::PreMmapHook> premmap_hook_;
 extern AtomicPtr<MallocHook::MmapHook>    mmap_hook_;
 extern AtomicPtr<MallocHook::MunmapHook>  munmap_hook_;
 extern AtomicPtr<MallocHook::MremapHook>  mremap_hook_;
 extern AtomicPtr<MallocHook::PreSbrkHook> presbrk_hook_;
 extern AtomicPtr<MallocHook::SbrkHook>    sbrk_hook_;
 // End DEPRECATED code.

 // Maximum of 7 hooks means that HookList is 8 words.
 static const int kHookListMaxValues = 7;

 // HookList: a class that provides synchronized insertions and removals and
 // lockless traversal.  Most of the implementation is in malloc_hook.cc.
 template <typename T>
 struct PERFTOOLS_DLL_DECL HookList {
   COMPILE_ASSERT(sizeof(T) <= sizeof(AtomicWord), T_should_fit_in_AtomicWord);

   // Adds value to the list.  Note that duplicates are allowed.  Thread-safe and
   // blocking (acquires hooklist_spinlock).  Returns true on success; false
   // otherwise (failures include invalid value and no space left).
   bool Add(T value);

   // Removes the first entry matching value from the list.  Thread-safe and
   // blocking (acquires hooklist_spinlock).  Returns true on success; false
   // otherwise (failures include invalid value and no value found).
   bool Remove(T value);

   // Store up to n values of the list in output_array, and return the number of
   // elements stored.  Thread-safe and non-blocking.  This is fast (one memory
   // access) if the list is empty.
   int Traverse(T* output_array, int n) const;

   // Fast inline implementation for fast path of Invoke*Hook.
   bool empty() const {
     return base::subtle::Acquire_Load(&priv_end) == 0;
   }

   // This internal data is not private so that the class is an aggregate and can
   // be initialized by the linker.  Don't access this directly.  Use the
   // INIT_HOOK_LIST macro in malloc_hook.cc.

   // One more than the index of the last valid element in priv_data.  During
   // 'Remove' this may be past the last valid element in priv_data, but
   // subsequent values will be 0.
   AtomicWord priv_end;
   AtomicWord priv_data[kHookListMaxValues];
 };

 extern HookList<MallocHook::NewHook> new_hooks_;
 extern HookList<MallocHook::DeleteHook> delete_hooks_;
 extern HookList<MallocHook::PreMmapHook> premmap_hooks_;
 extern HookList<MallocHook::MmapHook> mmap_hooks_;
 extern HookList<MallocHook::MmapReplacement> mmap_replacement_;
 extern HookList<MallocHook::MunmapHook> munmap_hooks_;
 extern HookList<MallocHook::MunmapReplacement> munmap_replacement_;
 extern HookList<MallocHook::MremapHook> mremap_hooks_;
 extern HookList<MallocHook::PreSbrkHook> presbrk_hooks_;
 extern HookList<MallocHook::SbrkHook> sbrk_hooks_;

 } }  // namespace base::internal

 // The following method is DEPRECATED
 inline MallocHook::NewHook MallocHook::GetNewHook() {
   return base::internal::new_hook_.Get();
 }

 inline void MallocHook::InvokeNewHook(const void* p, size_t s) {
   if (!base::internal::new_hooks_.empty()) {
     InvokeNewHookSlow(p, s);
   }
   // The following code is DEPRECATED.
   MallocHook::NewHook hook = MallocHook::GetNewHook();
   if (hook != NULL) (*hook)(p, s);
   // End DEPRECATED code.
 }

 // The following method is DEPRECATED
 inline MallocHook::DeleteHook MallocHook::GetDeleteHook() {
   return base::internal::delete_hook_.Get();
 }

 inline void MallocHook::InvokeDeleteHook(const void* p) {
   if (!base::internal::delete_hooks_.empty()) {
     InvokeDeleteHookSlow(p);
   }
   // The following code is DEPRECATED.
   MallocHook::DeleteHook hook = MallocHook::GetDeleteHook();
   if (hook != NULL) (*hook)(p);
   // End DEPRECATED code.
 }

 // The following method is DEPRECATED
 inline MallocHook::PreMmapHook MallocHook::GetPreMmapHook() {
   return base::internal::premmap_hook_.Get();
 }

 inline void MallocHook::InvokePreMmapHook(const void* start,
                                           size_t size,
                                           int protection,
                                           int flags,
                                           int fd,
                                           off_t offset) {
   if (!base::internal::premmap_hooks_.empty()) {
     InvokePreMmapHookSlow(start, size, protection, flags, fd, offset);
   }
   // The following code is DEPRECATED.
   MallocHook::PreMmapHook hook = MallocHook::GetPreMmapHook();
   if (hook != NULL) (*hook)(start, size,
                             protection, flags,
                             fd, offset);
   // End DEPRECATED code.
 }

 // The following method is DEPRECATED
 inline MallocHook::MmapHook MallocHook::GetMmapHook() {
   return base::internal::mmap_hook_.Get();
 }

 inline void MallocHook::InvokeMmapHook(const void* result,
                                        const void* start,
                                        size_t size,
                                        int protection,
                                        int flags,
                                        int fd,
                                        off_t offset) {
   if (!base::internal::mmap_hooks_.empty()) {
     InvokeMmapHookSlow(result, start, size, protection, flags, fd, offset);
   }
   // The following code is DEPRECATED.
   MallocHook::MmapHook hook = MallocHook::GetMmapHook();
   if (hook != NULL) (*hook)(result,
                             start, size,
                             protection, flags,
                             fd, offset);
   // End DEPRECATED code.
 }

 inline bool MallocHook::InvokeMmapReplacement(const void* start,
                                               size_t size,
                                               int protection,
                                               int flags,
                                               int fd,
                                               off_t offset,
                                               void** result) {
   if (!base::internal::mmap_replacement_.empty()) {
     return InvokeMmapReplacementSlow(start, size,
                                      protection, flags,
                                      fd, offset,
                                      result);
   }
   return false;
 }

 // The following method is DEPRECATED
 inline MallocHook::MunmapHook MallocHook::GetMunmapHook() {
   return base::internal::munmap_hook_.Get();
 }

 inline void MallocHook::InvokeMunmapHook(const void* p, size_t size) {
   if (!base::internal::munmap_hooks_.empty()) {
     InvokeMunmapHookSlow(p, size);
   }
   // The following code is DEPRECATED.
   MallocHook::MunmapHook hook = MallocHook::GetMunmapHook();
   if (hook != NULL) (*hook)(p, size);
   // End DEPRECATED code.
 }

 inline bool MallocHook::InvokeMunmapReplacement(
     const void* p, size_t size, int* result) {
   if (!base::internal::mmap_replacement_.empty()) {
     return InvokeMunmapReplacementSlow(p, size, result);
   }
   return false;
 }

 // The following method is DEPRECATED
 inline MallocHook::MremapHook MallocHook::GetMremapHook() {
   return base::internal::mremap_hook_.Get();
 }

 inline void MallocHook::InvokeMremapHook(const void* result,
                                          const void* old_addr,
                                          size_t old_size,
                                          size_t new_size,
                                          int flags,
                                          const void* new_addr) {
   if (!base::internal::mremap_hooks_.empty()) {
     InvokeMremapHookSlow(result, old_addr, old_size, new_size, flags, new_addr);
   }
   // The following code is DEPRECATED.
   MallocHook::MremapHook hook = MallocHook::GetMremapHook();
   if (hook != NULL) (*hook)(result,
                             old_addr, old_size,
                             new_size, flags, new_addr);
   // End DEPRECATED code.
 }

 // The following method is DEPRECATED
 inline MallocHook::PreSbrkHook MallocHook::GetPreSbrkHook() {
   return base::internal::presbrk_hook_.Get();
 }

 inline void MallocHook::InvokePreSbrkHook(ptrdiff_t increment) {
   if (!base::internal::presbrk_hooks_.empty() && increment != 0) {
     InvokePreSbrkHookSlow(increment);
   }
   // The following code is DEPRECATED.
   MallocHook::PreSbrkHook hook = MallocHook::GetPreSbrkHook();
   if (hook != NULL && increment != 0) (*hook)(increment);
   // End DEPRECATED code.
 }

 // The following method is DEPRECATED
 inline MallocHook::SbrkHook MallocHook::GetSbrkHook() {
   return base::internal::sbrk_hook_.Get();
 }

 inline void MallocHook::InvokeSbrkHook(const void* result,
                                        ptrdiff_t increment) {
   if (!base::internal::sbrk_hooks_.empty() && increment != 0) {
     InvokeSbrkHookSlow(result, increment);
   }
   // The following code is DEPRECATED.
   MallocHook::SbrkHook hook = MallocHook::GetSbrkHook();
   if (hook != NULL && increment != 0) (*hook)(result, increment);
   // End DEPRECATED code.
 }

 #endif /* _MALLOC_HOOK_INL_H_ */
	// Copyright (c) 2005, 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: Sanjay Ghemawat
	//
	// This has the implementation details of malloc_hook that are needed
	// to use malloc-hook inside the tcmalloc system. It does not hold
	// any of the client-facing calls that are used to add new hooks.

	#ifndef _MALLOC_HOOK_INL_H_
	#define _MALLOC_HOOK_INL_H_

	#include <stddef.h>
	#include <sys/types.h>
	#include "base/atomicops.h"
	#include "base/basictypes.h"
	#include <gperftools/malloc_hook.h>

	namespace base { namespace internal {

	// The following (implementation) code is DEPRECATED.
	// A simple atomic pointer class that can be initialized by the linker
	// when you define a namespace-scope variable as:
	//
	// AtomicPtr<Foo*> my_global = { &initial_value };
	//
	// This isn't suitable for a general atomic<> class because of the
	// public access to data_.
	template<typename PtrT>
	class AtomicPtr {
	public:
	COMPILE_ASSERT(sizeof(PtrT) <= sizeof(AtomicWord),
	PtrT_should_fit_in_AtomicWord);

	PtrT Get() const {
	// Depending on the system, Acquire_Load(AtomicWord*) may have
	// been defined to return an AtomicWord, Atomic32, or Atomic64.
	// We hide that implementation detail here with an explicit cast.
	// This prevents MSVC 2005, at least, from complaining (it has to
	// do with __wp64; AtomicWord is __wp64, but Atomic32/64 aren't).
	return reinterpret_cast<PtrT>(static_cast<AtomicWord>(
	base::subtle::Acquire_Load(&data_)));
	}

	// Sets the contained value to new_val and returns the old value,
	// atomically, with acquire and release semantics.
	// This is a full-barrier instruction.
	PtrT Exchange(PtrT new_val);

	// Atomically executes:
	// result = data_
	// if (data_ == old_val)
	// data_ = new_val;
	// return result;
	// This is a full-barrier instruction.
	PtrT CompareAndSwap(PtrT old_val, PtrT new_val);

	// Not private so that the class is an aggregate and can be
	// initialized by the linker. Don't access this directly.
	AtomicWord data_;
	};

	// These are initialized in malloc_hook.cc
	extern AtomicPtr<MallocHook::NewHook> new_hook_;
	extern AtomicPtr<MallocHook::DeleteHook> delete_hook_;
	extern AtomicPtr<MallocHook::PreMmapHook> premmap_hook_;
	extern AtomicPtr<MallocHook::MmapHook> mmap_hook_;
	extern AtomicPtr<MallocHook::MunmapHook> munmap_hook_;
	extern AtomicPtr<MallocHook::MremapHook> mremap_hook_;
	extern AtomicPtr<MallocHook::PreSbrkHook> presbrk_hook_;
	extern AtomicPtr<MallocHook::SbrkHook> sbrk_hook_;
	// End DEPRECATED code.

	// Maximum of 7 hooks means that HookList is 8 words.
	static const int kHookListMaxValues = 7;

	// HookList: a class that provides synchronized insertions and removals and
	// lockless traversal. Most of the implementation is in malloc_hook.cc.
	template <typename T>
	struct PERFTOOLS_DLL_DECL HookList {
	COMPILE_ASSERT(sizeof(T) <= sizeof(AtomicWord), T_should_fit_in_AtomicWord);

	// Adds value to the list. Note that duplicates are allowed. Thread-safe and
	// blocking (acquires hooklist_spinlock). Returns true on success; false
	// otherwise (failures include invalid value and no space left).
	bool Add(T value);

	// Removes the first entry matching value from the list. Thread-safe and
	// blocking (acquires hooklist_spinlock). Returns true on success; false
	// otherwise (failures include invalid value and no value found).
	bool Remove(T value);

	// Store up to n values of the list in output_array, and return the number of
	// elements stored. Thread-safe and non-blocking. This is fast (one memory
	// access) if the list is empty.
	int Traverse(T* output_array, int n) const;

	// Fast inline implementation for fast path of Invoke*Hook.
	bool empty() const {
	return base::subtle::Acquire_Load(&priv_end) == 0;
	}

	// This internal data is not private so that the class is an aggregate and can
	// be initialized by the linker. Don't access this directly. Use the
	// INIT_HOOK_LIST macro in malloc_hook.cc.

	// One more than the index of the last valid element in priv_data. During
	// 'Remove' this may be past the last valid element in priv_data, but
	// subsequent values will be 0.
	AtomicWord priv_end;
	AtomicWord priv_data[kHookListMaxValues];
	};

	extern HookList<MallocHook::NewHook> new_hooks_;
	extern HookList<MallocHook::DeleteHook> delete_hooks_;
	extern HookList<MallocHook::PreMmapHook> premmap_hooks_;
	extern HookList<MallocHook::MmapHook> mmap_hooks_;
	extern HookList<MallocHook::MmapReplacement> mmap_replacement_;
	extern HookList<MallocHook::MunmapHook> munmap_hooks_;
	extern HookList<MallocHook::MunmapReplacement> munmap_replacement_;
	extern HookList<MallocHook::MremapHook> mremap_hooks_;
	extern HookList<MallocHook::PreSbrkHook> presbrk_hooks_;
	extern HookList<MallocHook::SbrkHook> sbrk_hooks_;

	} } // namespace base::internal

	// The following method is DEPRECATED
	inline MallocHook::NewHook MallocHook::GetNewHook() {
	return base::internal::new_hook_.Get();
	}

	inline void MallocHook::InvokeNewHook(const void* p, size_t s) {
	if (!base::internal::new_hooks_.empty()) {
	InvokeNewHookSlow(p, s);
	}
	// The following code is DEPRECATED.
	MallocHook::NewHook hook = MallocHook::GetNewHook();
	if (hook != NULL) (*hook)(p, s);
	// End DEPRECATED code.
	}

	// The following method is DEPRECATED
	inline MallocHook::DeleteHook MallocHook::GetDeleteHook() {
	return base::internal::delete_hook_.Get();
	}

	inline void MallocHook::InvokeDeleteHook(const void* p) {
	if (!base::internal::delete_hooks_.empty()) {
	InvokeDeleteHookSlow(p);
	}
	// The following code is DEPRECATED.
	MallocHook::DeleteHook hook = MallocHook::GetDeleteHook();
	if (hook != NULL) (*hook)(p);
	// End DEPRECATED code.
	}

	// The following method is DEPRECATED
	inline MallocHook::PreMmapHook MallocHook::GetPreMmapHook() {
	return base::internal::premmap_hook_.Get();
	}

	inline void MallocHook::InvokePreMmapHook(const void* start,
	size_t size,
	int protection,
	int flags,
	int fd,
	off_t offset) {
	if (!base::internal::premmap_hooks_.empty()) {
	InvokePreMmapHookSlow(start, size, protection, flags, fd, offset);
	}
	// The following code is DEPRECATED.
	MallocHook::PreMmapHook hook = MallocHook::GetPreMmapHook();
	if (hook != NULL) (*hook)(start, size,
	protection, flags,
	fd, offset);
	// End DEPRECATED code.
	}

	// The following method is DEPRECATED
	inline MallocHook::MmapHook MallocHook::GetMmapHook() {
	return base::internal::mmap_hook_.Get();
	}

	inline void MallocHook::InvokeMmapHook(const void* result,
	const void* start,
	size_t size,
	int protection,
	int flags,
	int fd,
	off_t offset) {
	if (!base::internal::mmap_hooks_.empty()) {
	InvokeMmapHookSlow(result, start, size, protection, flags, fd, offset);
	}
	// The following code is DEPRECATED.
	MallocHook::MmapHook hook = MallocHook::GetMmapHook();
	if (hook != NULL) (*hook)(result,
	start, size,
	protection, flags,
	fd, offset);
	// End DEPRECATED code.
	}

	inline bool MallocHook::InvokeMmapReplacement(const void* start,
	size_t size,
	int protection,
	int flags,
	int fd,
	off_t offset,
	void** result) {
	if (!base::internal::mmap_replacement_.empty()) {
	return InvokeMmapReplacementSlow(start, size,
	protection, flags,
	fd, offset,
	result);
	}
	return false;
	}

	// The following method is DEPRECATED
	inline MallocHook::MunmapHook MallocHook::GetMunmapHook() {
	return base::internal::munmap_hook_.Get();
	}

	inline void MallocHook::InvokeMunmapHook(const void* p, size_t size) {
	if (!base::internal::munmap_hooks_.empty()) {
	InvokeMunmapHookSlow(p, size);
	}
	// The following code is DEPRECATED.
	MallocHook::MunmapHook hook = MallocHook::GetMunmapHook();
	if (hook != NULL) (*hook)(p, size);
	// End DEPRECATED code.
	}

	inline bool MallocHook::InvokeMunmapReplacement(
	const void* p, size_t size, int* result) {
	if (!base::internal::mmap_replacement_.empty()) {
	return InvokeMunmapReplacementSlow(p, size, result);
	}
	return false;
	}

	// The following method is DEPRECATED
	inline MallocHook::MremapHook MallocHook::GetMremapHook() {
	return base::internal::mremap_hook_.Get();
	}

	inline void MallocHook::InvokeMremapHook(const void* result,
	const void* old_addr,
	size_t old_size,
	size_t new_size,
	int flags,
	const void* new_addr) {
	if (!base::internal::mremap_hooks_.empty()) {
	InvokeMremapHookSlow(result, old_addr, old_size, new_size, flags, new_addr);
	}
	// The following code is DEPRECATED.
	MallocHook::MremapHook hook = MallocHook::GetMremapHook();
	if (hook != NULL) (*hook)(result,
	old_addr, old_size,
	new_size, flags, new_addr);
	// End DEPRECATED code.
	}

	// The following method is DEPRECATED
	inline MallocHook::PreSbrkHook MallocHook::GetPreSbrkHook() {
	return base::internal::presbrk_hook_.Get();
	}

	inline void MallocHook::InvokePreSbrkHook(ptrdiff_t increment) {
	if (!base::internal::presbrk_hooks_.empty() && increment != 0) {
	InvokePreSbrkHookSlow(increment);
	}
	// The following code is DEPRECATED.
	MallocHook::PreSbrkHook hook = MallocHook::GetPreSbrkHook();
	if (hook != NULL && increment != 0) (*hook)(increment);
	// End DEPRECATED code.
	}

	// The following method is DEPRECATED
	inline MallocHook::SbrkHook MallocHook::GetSbrkHook() {
	return base::internal::sbrk_hook_.Get();
	}

	inline void MallocHook::InvokeSbrkHook(const void* result,
	ptrdiff_t increment) {
	if (!base::internal::sbrk_hooks_.empty() && increment != 0) {
	InvokeSbrkHookSlow(result, increment);
	}
	// The following code is DEPRECATED.
	MallocHook::SbrkHook hook = MallocHook::GetSbrkHook();
	if (hook != NULL && increment != 0) (*hook)(result, increment);
	// End DEPRECATED code.
	}

	#endif /* _MALLOC_HOOK_INL_H_ */