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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 <stdint.h>
#include <memory>
#include <string>
#include "base/base_export.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/trace_event/memory_allocator_dump_guid.h"
#include "base/values.h"
namespace base {
namespace trace_event {
class ProcessMemoryDump;
class TracedValue;
// Data model for user-land memory allocator dumps.
class BASE_EXPORT MemoryAllocatorDump {
public:
enum Flags {
DEFAULT = 0,
// A dump marked weak will be discarded by TraceViewer.
WEAK = 1 << 0,
};
// 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|s for the AddScalar and AddString() methods.
static const char kNameSize[]; // To represent allocated space.
static const char kNameObjectCount[]; // To represent number of objects.
// Standard attribute |unit|s for the AddScalar and AddString() methods.
static const char kUnitsBytes[]; // Unit name to represent bytes.
static const char kUnitsObjects[]; // Unit name to represent #objects.
// Constants used only internally and by tests.
static const char kTypeScalar[]; // Type name for scalar attributes.
static const char kTypeString[]; // Type name for string attributes.
// Setters for scalar attributes. Some examples:
// - "size" column (all dumps are expected to have at least this one):
// AddScalar(kNameSize, kUnitsBytes, 1234);
// - Some extra-column reporting internal details of the subsystem:
// AddScalar("number_of_freelist_entires", kUnitsObjects, 42)
// - Other informational column (will not be auto-added in the UI)
// AddScalarF("kittens_ratio", "ratio", 42.0f)
void AddScalar(const char* name, const char* units, uint64_t value);
void AddScalarF(const char* name, const char* units, double value);
void AddString(const char* name, const char* units, const std::string& value);
// Absolute name, unique within the scope of an entire ProcessMemoryDump.
const std::string& absolute_name() const { return absolute_name_; }
// Called at trace generation time to populate the TracedValue.
void AsValueInto(TracedValue* value) const;
// Use enum Flags to set values.
void set_flags(int flags) { flags_ |= flags; }
void clear_flags(int flags) { flags_ &= ~flags; }
int flags() { return flags_; }
// |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).
std::unique_ptr<TracedValue> attributes_;
MemoryAllocatorDumpGuid guid_;
int flags_; // See enum Flags.
// 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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