diff --git a/src/malloc_hook-inl.h b/src/malloc_hook-inl.h
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+// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
+// 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 {
+
+// Capacity of 8 means that HookList is 9 words.
+static const int kHookListCapacity = 8;
+// last entry is reserved for deprecated "singular" hooks. So we have
+// 7 "normal" hooks per list
+static const int kHookListMaxValues = 7;
+static const int kHookListSingularIdx = 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);
+
+  void FixupPrivEndLocked();
+
+  // 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::NoBarrier_Load(&priv_end) == 0;
+  }
+
+  // Used purely to handle deprecated singular hooks
+  T GetSingular() const {
+    const AtomicWord *place = &priv_data[kHookListSingularIdx];
+    return bit_cast<T>(base::subtle::NoBarrier_Load(place));
+  }
+
+  T ExchangeSingular(T new_val);
+
+  // 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.
+  //
+  // Index kHookListCapacity-1 is reserved as 'deprecated' single hook pointer
+  AtomicWord priv_end;
+  AtomicWord priv_data[kHookListCapacity];
+};
+
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::NewHook> new_hooks_;
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::DeleteHook> delete_hooks_;
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::PreMmapHook> premmap_hooks_;
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::MmapHook> mmap_hooks_;
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::MmapReplacement> mmap_replacement_;
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::MunmapHook> munmap_hooks_;
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::MunmapReplacement> munmap_replacement_;
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::MremapHook> mremap_hooks_;
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::PreSbrkHook> presbrk_hooks_;
+ATTRIBUTE_VISIBILITY_HIDDEN extern HookList<MallocHook::SbrkHook> sbrk_hooks_;
+
+} }  // namespace base::internal
+
+// The following method is DEPRECATED
+inline MallocHook::NewHook MallocHook::GetNewHook() {
+  return base::internal::new_hooks_.GetSingular();
+}
+
+inline void MallocHook::InvokeNewHook(const void* p, size_t s) {
+  if (!base::internal::new_hooks_.empty()) {
+    InvokeNewHookSlow(p, s);
+  }
+}
+
+// The following method is DEPRECATED
+inline MallocHook::DeleteHook MallocHook::GetDeleteHook() {
+  return base::internal::delete_hooks_.GetSingular();
+}
+
+inline void MallocHook::InvokeDeleteHook(const void* p) {
+  if (!base::internal::delete_hooks_.empty()) {
+    InvokeDeleteHookSlow(p);
+  }
+}
+
+// The following method is DEPRECATED
+inline MallocHook::PreMmapHook MallocHook::GetPreMmapHook() {
+  return base::internal::premmap_hooks_.GetSingular();
+}
+
+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 method is DEPRECATED
+inline MallocHook::MmapHook MallocHook::GetMmapHook() {
+  return base::internal::mmap_hooks_.GetSingular();
+}
+
+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);
+  }
+}
+
+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_hooks_.GetSingular();
+}
+
+inline void MallocHook::InvokeMunmapHook(const void* p, size_t size) {
+  if (!base::internal::munmap_hooks_.empty()) {
+    InvokeMunmapHookSlow(p, size);
+  }
+}
+
+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_hooks_.GetSingular();
+}
+
+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 method is DEPRECATED
+inline MallocHook::PreSbrkHook MallocHook::GetPreSbrkHook() {
+  return base::internal::presbrk_hooks_.GetSingular();
+}
+
+inline void MallocHook::InvokePreSbrkHook(ptrdiff_t increment) {
+  if (!base::internal::presbrk_hooks_.empty() && increment != 0) {
+    InvokePreSbrkHookSlow(increment);
+  }
+}
+
+// The following method is DEPRECATED
+inline MallocHook::SbrkHook MallocHook::GetSbrkHook() {
+  return base::internal::sbrk_hooks_.GetSingular();
+}
+
+inline void MallocHook::InvokeSbrkHook(const void* result,
+                                       ptrdiff_t increment) {
+  if (!base::internal::sbrk_hooks_.empty() && increment != 0) {
+    InvokeSbrkHookSlow(result, increment);
+  }
+}
+
+#endif /* _MALLOC_HOOK_INL_H_ */