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100 lines
3.6 KiB
C++
100 lines
3.6 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_H_
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#define BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_H_
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#include "base/base_export.h"
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#include "base/basictypes.h"
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#include "base/logging.h"
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#include "base/trace_event/memory_allocator_dump_guid.h"
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#include "base/values.h"
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namespace base {
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namespace trace_event {
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class MemoryDumpManager;
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class ProcessMemoryDump;
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class TracedValue;
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// Data model for user-land memory allocator dumps.
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class BASE_EXPORT MemoryAllocatorDump {
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public:
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// MemoryAllocatorDump is owned by ProcessMemoryDump.
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MemoryAllocatorDump(const std::string& absolute_name,
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ProcessMemoryDump* process_memory_dump,
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const MemoryAllocatorDumpGuid& guid);
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MemoryAllocatorDump(const std::string& absolute_name,
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ProcessMemoryDump* process_memory_dump);
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~MemoryAllocatorDump();
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// Standard attribute name to model allocated space.
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static const char kNameSize[];
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// Standard attribute name to model total space requested by the allocator
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// (e.g., amount of pages requested to the system).
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static const char kNameOuterSize[];
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// Standard attribute name to model space for allocated objects, without
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// taking into account allocator metadata or fragmentation.
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static const char kNameInnerSize[];
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// Standard attribute name to model the number of objects allocated.
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static const char kNameObjectsCount[];
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static const char kTypeScalar[]; // Type name for scalar attributes.
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static const char kTypeString[]; // Type name for string attributes.
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static const char kUnitsBytes[]; // Unit name to represent bytes.
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static const char kUnitsObjects[]; // Unit name to represent #objects.
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// Absolute name, unique within the scope of an entire ProcessMemoryDump.
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const std::string& absolute_name() const { return absolute_name_; }
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// Generic attribute setter / getter.
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void Add(const std::string& name,
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const char* type,
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const char* units,
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scoped_ptr<Value> value);
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bool Get(const std::string& name,
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const char** out_type,
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const char** out_units,
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const Value** out_value) const;
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// Helper setter for scalar attributes.
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void AddScalar(const std::string& name, const char* units, uint64 value);
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void AddScalarF(const std::string& name, const char* units, double value);
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void AddString(const std::string& name,
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const char* units,
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const std::string& value);
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// Called at trace generation time to populate the TracedValue.
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void AsValueInto(TracedValue* value) const;
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// Get the ProcessMemoryDump instance that owns this.
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ProcessMemoryDump* process_memory_dump() const {
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return process_memory_dump_;
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}
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// |guid| is an optional global dump identifier, unique across all processes
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// within the scope of a global dump. It is only required when using the
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// graph APIs (see TODO_method_name) to express retention / suballocation or
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// cross process sharing. See crbug.com/492102 for design docs.
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// Subsequent MemoryAllocatorDump(s) with the same |absolute_name| are
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// expected to have the same guid.
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const MemoryAllocatorDumpGuid& guid() const { return guid_; }
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private:
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const std::string absolute_name_;
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ProcessMemoryDump* const process_memory_dump_; // Not owned (PMD owns this).
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DictionaryValue attributes_;
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MemoryAllocatorDumpGuid guid_;
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DISALLOW_COPY_AND_ASSIGN(MemoryAllocatorDump);
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};
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} // namespace trace_event
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} // namespace base
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#endif // BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_H_
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