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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 <opensource@google.com>
//
// Extra interfaces exported by some malloc implementations. These
// interfaces are accessed through a virtual base class so an
// application can link against a malloc that does not implement these
// interfaces, and it will get default versions that do nothing.
#ifndef _GOOGLE_MALLOC_EXTENSION_H__
#define _GOOGLE_MALLOC_EXTENSION_H__
#include <stddef.h>
static const int kMallocHistogramSize = 64;
// The default implementations of the following routines do nothing.
class MallocExtension {
public:
virtual ~MallocExtension();
// Call this very early in the program execution -- say, in a global
// constructor -- to set up parameters and state needed by all
// instrumented malloc implemenatations. One example: this routine
// sets environemnt variables to tell STL to use libc's malloc()
// instead of doing its own memory management. This is safe to call
// multiple times, as long as each time is before threads start up.
static void Initialize();
// See "verify_memory.h" to see what these routines do
virtual bool VerifyAllMemory();
virtual bool VerifyNewMemory(void* p);
virtual bool VerifyArrayNewMemory(void* p);
virtual bool VerifyMallocMemory(void* p);
virtual bool MallocMemoryStats(int* blocks, size_t* total,
int histogram[kMallocHistogramSize]);
// Get a human readable description of the current state of the malloc
// data structures. The state is stored as a null-terminated string
// in a prefix of "buffer[0,buffer_length-1]".
// REQUIRES: buffer_length > 0.
virtual void GetStats(char* buffer, int buffer_length);
// -------------------------------------------------------------------
// Control operations for getting and setting malloc implementation
// specific parameters. Some currently useful properties:
//
// generic
// -------
// "generic.current_allocated_bytes"
// Number of bytes currently allocated by application
// This property is not writable.
//
// "generic.heap_size"
// Number of bytes in the heap ==
// current_allocated_bytes +
// fragmentation +
// freed memory regions
// This property is not writable.
//
// tcmalloc
// --------
// "tcmalloc.max_total_thread_cache_bytes"
// Upper limit on total number of bytes stored across all
// per-thread caches. Default: 16MB.
//
// "tcmalloc.current_total_thread_cache_bytes"
// Number of bytes used across all thread caches.
// This property is not writable.
//
// "tcmalloc.slack_bytes"
// Number of bytes allocated from system, but not currently
// in use by malloced objects. I.e., bytes available for
// allocation without needing more bytes from system.
// This property is not writable.
//
// TODO: Add more properties as necessary
// -------------------------------------------------------------------
// Get the named "property"'s value. Returns true if the property
// is known. Returns false if the property is not a valid property
// name for the current malloc implementation.
// REQUIRES: property != NULL; value != NULL
virtual bool GetNumericProperty(const char* property, size_t* value);
// Set the named "property"'s value. Returns true if the property
// is known and writable. Returns false if the property is not a
// valid property name for the current malloc implementation, or
// is not writable.
// REQUIRES: property != NULL
virtual bool SetNumericProperty(const char* property, size_t value);
// The current malloc implementation. Always non-NULL.
static MallocExtension* instance();
// Change the malloc implementation. Typically called by the
// malloc implementation during initialization.
static void Register(MallocExtension* implementation);
protected:
// Get a list of stack traces of sampled allocation points.
// Returns a pointer to a "new[]-ed" result array.
//
// The state is stored as a sequence of adjacent entries
// in the returned array. Each entry has the following form:
// uintptr_t count; // Number of objects with following trace
// uintptr_t size; // Size of object
// uintptr_t depth; // Number of PC values in stack trace
// void* stack[depth]; // PC values that form the stack trace
//
// The list of entries is terminated by a "count" of 0.
//
// It is the responsibility of the caller to "delete[]" the returned array.
//
// May return NULL to indicate no results.
//
// This is an internal extension. Callers should use the more
// convenient "GetHeapSample(string*)" method defined above.
virtual void** ReadStackTraces();
// Like ReadStackTraces(), but returns stack traces that caused growth
// in the address space size.
virtual void** ReadHeapGrowthStackTraces();
};
#endif // _GOOGLE_MALLOC_EXTENSION_H__
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