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Unified Diff: base/trace_event/heap_profiler_string_deduplicator.h

Issue 2650863003: [tracing] Switch to new heap dump format. (Closed)
Patch Set: Fix rebase damage Created 3 years, 7 months ago
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Index: base/trace_event/heap_profiler_string_deduplicator.h
diff --git a/base/trace_event/heap_profiler_string_deduplicator.h b/base/trace_event/heap_profiler_string_deduplicator.h
new file mode 100644
index 0000000000000000000000000000000000000000..e43d0a5f21f19329a005597b9f6d823704b24a60
--- /dev/null
+++ b/base/trace_event/heap_profiler_string_deduplicator.h
@@ -0,0 +1,50 @@
+// Copyright 2017 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_HEAP_PROFILER_STRING_DEDUPLICATOR_H_
+#define BASE_TRACE_EVENT_HEAP_PROFILER_STRING_DEDUPLICATOR_H_
+
+#include <deque>
+#include <string>
+#include <unordered_map>
+
+#include "base/base_export.h"
+#include "base/macros.h"
+#include "base/strings/string_piece.h"
+
+namespace base {
+namespace trace_event {
+
+class TraceEventMemoryOverhead;
+class TracedValue;
+
+// Data structure that assigns a unique numeric ID to |const char*|s.
+class BASE_EXPORT StringDeduplicator {
+ public:
+ StringDeduplicator();
+ ~StringDeduplicator();
+
+ // Inserts a string and returns its ID.
+ int Insert(StringPiece string);
+
+ // Append {ID -> string} mappings that were added after the last call
+ // to this function.
+ void SerializeIncrementally(TracedValue* traced_value);
+
+ // Estimates memory overhead including |sizeof(StringDeduplicator)|.
+ void EstimateTraceMemoryOverhead(TraceEventMemoryOverhead* overhead);
+
+ private:
+ // StringPieces in the map reference values from |string_|.
+ std::unordered_map<StringPiece, int, StringPieceHash> string_ids_;
+ std::deque<std::string> strings_;
+ size_t last_serialized_index_;
+
+ DISALLOW_COPY_AND_ASSIGN(StringDeduplicator);
+};
+
+} // namespace trace_event
+} // namespace base
+
+#endif // BASE_TRACE_EVENT_HEAP_PROFILER_STRING_DEDUPLICATOR_H_

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