// Copyright (c) 2005, Google Inc.
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//
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// in the documentation and/or other materials provided with the
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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 <google/malloc_hook.h>
namespace base { namespace internal {
// 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.
PtrT Exchange(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_;
} } // namespace base::internal
inline MallocHook::NewHook MallocHook::GetNewHook() {
return base::internal::new_hook_.Get();
}
inline void MallocHook::InvokeNewHook(const void* p, size_t s) {
MallocHook::NewHook hook = MallocHook::GetNewHook();
if (hook != NULL) (*hook)(p, s);
}
inline MallocHook::DeleteHook MallocHook::GetDeleteHook() {
return base::internal::delete_hook_.Get();
}
inline void MallocHook::InvokeDeleteHook(const void* p) {
MallocHook::DeleteHook hook = MallocHook::GetDeleteHook();
if (hook != NULL) (*hook)(p);
}
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) {
MallocHook::PreMmapHook hook = MallocHook::GetPreMmapHook();
if (hook != NULL) (*hook)(start, size,
protection, flags,
fd, offset);
}
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) {
MallocHook::MmapHook hook = MallocHook::GetMmapHook();
if (hook != NULL) (*hook)(result,
start, size,
protection, flags,
fd, offset);
}
inline MallocHook::MunmapHook MallocHook::GetMunmapHook() {
return base::internal::munmap_hook_.Get();
}
inline void MallocHook::InvokeMunmapHook(const void* p, size_t size) {
MallocHook::MunmapHook hook = MallocHook::GetMunmapHook();
if (hook != NULL) (*hook)(p, size);
}
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) {
MallocHook::MremapHook hook = MallocHook::GetMremapHook();
if (hook != NULL) (*hook)(result,
old_addr, old_size,
new_size, flags, new_addr);
}
inline MallocHook::PreSbrkHook MallocHook::GetPreSbrkHook() {
return base::internal::presbrk_hook_.Get();
}
inline void MallocHook::InvokePreSbrkHook(ptrdiff_t increment) {
MallocHook::PreSbrkHook hook = MallocHook::GetPreSbrkHook();
if (hook != NULL && increment != 0) (*hook)(increment);
}
inline MallocHook::SbrkHook MallocHook::GetSbrkHook() {
return base::internal::sbrk_hook_.Get();
}
inline void MallocHook::InvokeSbrkHook(const void* result,
ptrdiff_t increment) {
MallocHook::SbrkHook hook = MallocHook::GetSbrkHook();
if (hook != NULL && increment != 0) (*hook)(result, increment);
}
#endif /* _MALLOC_HOOK_INL_H_ */