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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_H_
#define BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_H_
#include <string>
#include "base/base_export.h"
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/trace_event/memory_allocator_dump_guid.h"
#include "base/values.h"
namespace base {
namespace trace_event {
class MemoryDumpManager;
class ProcessMemoryDump;
class TracedValue;
// Data model for user-land memory allocator dumps.
class BASE_EXPORT MemoryAllocatorDump {
public:
// MemoryAllocatorDump is owned by ProcessMemoryDump.
MemoryAllocatorDump(const std::string& absolute_name,
ProcessMemoryDump* process_memory_dump,
const MemoryAllocatorDumpGuid& guid);
MemoryAllocatorDump(const std::string& absolute_name,
ProcessMemoryDump* process_memory_dump);
~MemoryAllocatorDump();
// Standard attribute name to model allocated space.
static const char kNameSize[];
// Standard attribute name to model the number of objects allocated.
static const char kNameObjectsCount[];
static const char kTypeScalar[]; // Type name for scalar attributes.
static const char kTypeString[]; // Type name for string attributes.
static const char kUnitsBytes[]; // Unit name to represent bytes.
static const char kUnitsObjects[]; // Unit name to represent #objects.
// Absolute name, unique within the scope of an entire ProcessMemoryDump.
const std::string& absolute_name() const { return absolute_name_; }
// Helper setter for scalar attributes.
void AddScalar(const char* name, const char* units, uint64 value);
void AddScalarF(const char* name, const char* units, double value);
void AddString(const char* name, const char* units, const std::string& value);
// Called at trace generation time to populate the TracedValue.
void AsValueInto(TracedValue* value) const;
// Get the ProcessMemoryDump instance that owns this.
ProcessMemoryDump* process_memory_dump() const {
return process_memory_dump_;
}
// |guid| is an optional global dump identifier, unique across all processes
// within the scope of a global dump. It is only required when using the
// graph APIs (see TODO_method_name) to express retention / suballocation or
// cross process sharing. See crbug.com/492102 for design docs.
// Subsequent MemoryAllocatorDump(s) with the same |absolute_name| are
// expected to have the same guid.
const MemoryAllocatorDumpGuid& guid() const { return guid_; }
TracedValue* attributes_for_testing() const { return attributes_.get(); }
private:
const std::string absolute_name_;
ProcessMemoryDump* const process_memory_dump_; // Not owned (PMD owns this).
scoped_refptr<TracedValue> attributes_;
MemoryAllocatorDumpGuid guid_;
// A local buffer for Sprintf conversion on fastpath. Avoids allocating
// temporary strings on each AddScalar() call.
std::string string_conversion_buffer_;
DISALLOW_COPY_AND_ASSIGN(MemoryAllocatorDump);
};
} // namespace trace_event
} // namespace base
#endif // BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_H_
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