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// 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
//
// Some of our malloc implementations can invoke the following hooks
// whenever memory is allocated or deallocated. If the hooks are
// NULL, they are not invoked.
//
// One important user of these hooks is the heap profiler.
//
// CAVEAT: If you add new MallocHook::Invoke* calls (not for chaining hooks),
// then those calls must be directly in the code of the (de)allocation
// function that is provided to the user and that function must have
// an ATTRIBUTE_SECTION(malloc_hook_callers) attribute.
#ifndef _MALLOC_HOOK_H
#define _MALLOC_HOOK_H
#include <stddef.h>
#include <sys/types.h>
class MallocHook {
public:
// The NewHook is invoked whenever an object is allocated.
// It may be passed NULL if the allocator returned NULL.
typedef void (*NewHook)(void* ptr, size_t size);
inline static NewHook GetNewHook() { return new_hook_; }
inline static NewHook SetNewHook(NewHook hook) {
NewHook result = new_hook_;
new_hook_ = hook;
return result;
}
inline static void InvokeNewHook(void* p, size_t s) {
if (new_hook_ != NULL) (*new_hook_)(p, s);
}
// The DeleteHook is invoked whenever an object is deallocated.
// It may be passed NULL if the caller is trying to delete NULL.
typedef void (*DeleteHook)(void* ptr);
inline static DeleteHook GetDeleteHook() { return delete_hook_; }
inline static DeleteHook SetDeleteHook(DeleteHook hook) {
DeleteHook result = delete_hook_;
delete_hook_ = hook;
return result;
}
inline static void InvokeDeleteHook(void* p) {
if (delete_hook_ != NULL) (*delete_hook_)(p);
}
// The MmapHook is invoked whenever a region of memory is mapped.
// It may be passed MAP_FAILED if the mmap failed.
typedef void (*MmapHook)(void* result,
void* start,
size_t size,
int protection,
int flags,
int fd,
off_t offset);
inline static MmapHook GetMmapHook() { return mmap_hook_; }
inline static MmapHook SetMmapHook(MmapHook hook) {
MmapHook result = mmap_hook_;
mmap_hook_ = hook;
return result;
}
inline static void InvokeMmapHook(void* result,
void* start,
size_t size,
int protection,
int flags,
int fd,
off_t offset) {
if (mmap_hook_ != NULL) (*mmap_hook_)(result,
start, size,
protection, flags,
fd, offset);
}
// The MunmapHook is invoked whenever a region of memory is unmapped.
typedef void (*MunmapHook)(void* ptr, size_t size);
inline static MunmapHook GetMunmapHook() { return munmap_hook_; }
inline static MunmapHook SetMunmapHook(MunmapHook hook) {
MunmapHook result = munmap_hook_;
munmap_hook_ = hook;
return result;
}
inline static void InvokeMunmapHook(void* p, size_t size) {
if (munmap_hook_ != NULL) (*munmap_hook_)(p, size);
}
// The MremapHook is invoked whenever a region of memory is remapped.
typedef void (*MremapHook)(void* result,
void* old_addr,
size_t old_size,
size_t new_size,
int flags,
void* new_addr);
inline static MremapHook GetMremapHook() { return mremap_hook_; }
inline static MremapHook SetMremapHook(MremapHook hook) {
MremapHook result = mremap_hook_;
mremap_hook_ = hook;
return result;
}
inline static void InvokeMremapHook(void* result,
void* old_addr,
size_t old_size,
size_t new_size,
int flags,
void* new_addr) {
if (mremap_hook_ != NULL) (*mremap_hook_)(result,
old_addr, old_size,
new_size, flags, new_addr);
}
// The SbrkHook is invoked whenever sbrk is called.
typedef void (*SbrkHook)(void* result, ptrdiff_t increment);
inline static SbrkHook GetSbrkHook() { return sbrk_hook_; }
inline static SbrkHook SetSbrkHook(SbrkHook hook) {
SbrkHook result = sbrk_hook_;
sbrk_hook_ = hook;
return result;
}
inline static void InvokeSbrkHook(void* result, ptrdiff_t increment) {
if (sbrk_hook_ != NULL) (*sbrk_hook_)(result, increment);
}
// Get the current stack trace. Try to skip all routines up to and
// and including the caller of MallocHook::Invoke*.
// Use "skip_count" (similarly to GetStackTrace from stacktrace.h)
// as a hint about how many routines to skip if better information
// is not available.
static int GetCallerStackTrace(void** result, int max_depth, int skip_count);
private:
static NewHook new_hook_;
static DeleteHook delete_hook_;
static MmapHook mmap_hook_;
static MunmapHook munmap_hook_;
static MremapHook mremap_hook_;
static SbrkHook sbrk_hook_;
};
#endif /* _MALLOC_HOOK_H */
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