[Tracing] Implement IC statistics in tracing.

src/ic/ic-stats.h

+// Copyright 2016 the V8 project 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 V8_IC_IC_STATS_H_
+#define V8_IC_IC_STATS_H_
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "src/base/atomicops.h"
+#include "src/base/lazy-instance.h"
+
+namespace v8 {
+
+namespace tracing {
+class TracedValue;
+}
+
+namespace internal {
+
+class JSFunction;
+class Script;
+
+struct ICInfo {
+  ICInfo();
+  void Reset();
+  void AppendToTracedValue(v8::tracing::TracedValue* value) const;
+  std::string type;
+  const char* function_name;
+  int script_offset;
+  const char* script_name;
+  int line_num;
+  bool is_constructor;
+  bool is_optimized;
+  std::string state;
+  // Address of the map.
+  void* map;
+  // Whether map is a dictionary map.
+  bool is_dictionary_map;
+  // Number of own descriptors.
+  unsigned number_of_own_descriptors;
+  std::string instance_type;
+};
+
+class ICStats {
+ public:
+  const int MAX_IC_INFO = 4096;
+
+  ICStats();
+  void Dump();
+  void Begin();
+  void End();
+  void Reset();
+  V8_INLINE ICInfo& Current() {
+    DCHECK(pos_ >= 0 && pos_ < MAX_IC_INFO);
+    return ic_infos_[pos_];
+  }
+  const char* GetOrCacheScriptName(Script* script);
+  const char* GetOrCacheFunctionName(JSFunction* function);
+  V8_INLINE static ICStats* instance() { return instance_.Pointer(); }
+
+ private:
+  static base::LazyInstance<ICStats>::type instance_;
+  base::Atomic32 enabled_;
+  std::vector<ICInfo> ic_infos_;
+  std::unordered_map<Script*, std::unique_ptr<char[]>> script_name_map_;
+  std::unordered_map<JSFunction*, std::unique_ptr<char[]>> function_name_map_;
+  int pos_;
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_IC_IC_STATS_H_