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116 lines
4.1 KiB
C++
116 lines
4.1 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_HEAP_PROFILER_HEAP_DUMP_WRITER_H_
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#define BASE_TRACE_EVENT_HEAP_PROFILER_HEAP_DUMP_WRITER_H_
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#include <stddef.h>
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#include <memory>
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#include <set>
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#include <unordered_map>
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#include "base/base_export.h"
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#include "base/macros.h"
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#include "base/trace_event/heap_profiler_allocation_context.h"
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namespace base {
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namespace trace_event {
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class HeapProfilerSerializationState;
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class StackFrameDeduplicator;
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class TracedValue;
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class TypeNameDeduplicator;
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// Aggregates |metrics_by_context|, recursively breaks down the heap, and
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// returns a traced value with an "entries" array that can be dumped in the
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// trace log, following the format described in https://goo.gl/KY7zVE. The
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// number of entries is kept reasonable because long tails are not included.
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BASE_EXPORT std::unique_ptr<TracedValue> ExportHeapDump(
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const std::unordered_map<AllocationContext, AllocationMetrics>&
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metrics_by_context,
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const HeapProfilerSerializationState& heap_profiler_serialization_state);
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namespace internal {
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namespace {
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struct Bucket;
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}
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// An entry in the "entries" array as described in https://goo.gl/KY7zVE.
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struct BASE_EXPORT Entry {
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size_t size;
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size_t count;
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// References a backtrace in the stack frame deduplicator. -1 means empty
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// backtrace (the root of the tree).
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int stack_frame_id;
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// References a type name in the type name deduplicator. -1 indicates that
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// the size is the cumulative size for all types (the root of the tree).
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int type_id;
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};
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// Comparison operator to enable putting |Entry| in a |std::set|.
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BASE_EXPORT bool operator<(Entry lhs, Entry rhs);
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// Serializes entries to an "entries" array in a traced value.
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BASE_EXPORT std::unique_ptr<TracedValue> Serialize(const std::set<Entry>& dump);
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// Helper class to dump a snapshot of an |AllocationRegister| or other heap
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// bookkeeping structure into a |TracedValue|. This class is intended to be
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// used as a one-shot local instance on the stack.
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class BASE_EXPORT HeapDumpWriter {
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public:
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// The |stack_frame_deduplicator| and |type_name_deduplicator| are not owned.
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// The heap dump writer assumes exclusive access to them during the lifetime
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// of the dump writer. The heap dumps are broken down for allocations bigger
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// than |breakdown_threshold_bytes|.
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HeapDumpWriter(StackFrameDeduplicator* stack_frame_deduplicator,
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TypeNameDeduplicator* type_name_deduplicator,
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uint32_t breakdown_threshold_bytes);
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~HeapDumpWriter();
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// Aggregates allocations to compute the total size of the heap, then breaks
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// down the heap recursively. This produces the values that should be dumped
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// in the "entries" array. The number of entries is kept reasonable because
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// long tails are not included. Use |Serialize| to convert to a traced value.
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const std::set<Entry>& Summarize(
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const std::unordered_map<AllocationContext, AllocationMetrics>&
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metrics_by_context);
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private:
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// Inserts an |Entry| for |Bucket| into |entries_|. Returns false if the
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// entry was present before, true if it was not.
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bool AddEntryForBucket(const Bucket& bucket);
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// Recursively breaks down a bucket into smaller buckets and adds entries for
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// the buckets worth dumping to |entries_|.
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void BreakDown(const Bucket& bucket);
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// The collection of entries that is filled by |Summarize|.
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std::set<Entry> entries_;
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// Helper for generating the |stackFrames| dictionary. Not owned, must outlive
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// this heap dump writer instance.
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StackFrameDeduplicator* const stack_frame_deduplicator_;
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// Helper for converting type names to IDs. Not owned, must outlive this heap
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// dump writer instance.
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TypeNameDeduplicator* const type_name_deduplicator_;
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// Minimum size of an allocation for which an allocation bucket will be
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// broken down with children.
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uint32_t breakdown_threshold_bytes_;
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DISALLOW_COPY_AND_ASSIGN(HeapDumpWriter);
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};
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} // namespace internal
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} // namespace trace_event
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} // namespace base
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#endif // BASE_TRACE_EVENT_HEAP_PROFILER_HEAP_DUMP_WRITER_H_
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