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// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
// Copyright (c) 2005, Google Inc.
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//
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// ---
// 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>
#include "common.h" // for UNLIKELY
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 (UNLIKELY(!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 (UNLIKELY(!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_ */