1// Copyright 2016 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "src/ic/ic-stats.h"
6
7#include "src/flags.h"
8#include "src/objects-inl.h"
9#include "src/tracing/trace-event.h"
10#include "src/tracing/traced-value.h"
11#include "src/v8.h"
12
13namespace v8 {
14namespace internal {
15
16base::LazyInstance<ICStats>::type ICStats::instance_ =
17    LAZY_INSTANCE_INITIALIZER;
18
19ICStats::ICStats() : ic_infos_(MAX_IC_INFO), pos_(0) {
20  base::NoBarrier_Store(&enabled_, 0);
21}
22
23void ICStats::Begin() {
24  if (V8_LIKELY(!FLAG_ic_stats)) return;
25  base::NoBarrier_Store(&enabled_, 1);
26}
27
28void ICStats::End() {
29  if (base::NoBarrier_Load(&enabled_) != 1) return;
30  ++pos_;
31  if (pos_ == MAX_IC_INFO) {
32    Dump();
33  }
34  base::NoBarrier_Store(&enabled_, 0);
35}
36
37void ICStats::Reset() {
38  for (auto ic_info : ic_infos_) {
39    ic_info.Reset();
40  }
41  pos_ = 0;
42}
43
44void ICStats::Dump() {
45  auto value = v8::tracing::TracedValue::Create();
46  value->BeginArray("data");
47  for (int i = 0; i < pos_; ++i) {
48    ic_infos_[i].AppendToTracedValue(value.get());
49  }
50  value->EndArray();
51
52  TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("v8.ic_stats"), "V8.ICStats",
53                       TRACE_EVENT_SCOPE_THREAD, "ic-stats", std::move(value));
54  Reset();
55}
56
57const char* ICStats::GetOrCacheScriptName(Script* script) {
58  if (script_name_map_.find(script) != script_name_map_.end()) {
59    return script_name_map_[script].get();
60  }
61  Object* script_name_raw = script->name();
62  if (script_name_raw->IsString()) {
63    String* script_name = String::cast(script_name_raw);
64    char* c_script_name =
65        script_name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL)
66            .release();
67    script_name_map_.insert(
68        std::make_pair(script, std::unique_ptr<char[]>(c_script_name)));
69    return c_script_name;
70  } else {
71    script_name_map_.insert(
72        std::make_pair(script, std::unique_ptr<char[]>(nullptr)));
73    return nullptr;
74  }
75  return nullptr;
76}
77
78const char* ICStats::GetOrCacheFunctionName(JSFunction* function) {
79  if (function_name_map_.find(function) != function_name_map_.end()) {
80    return function_name_map_[function].get();
81  }
82  SharedFunctionInfo* shared = function->shared();
83  ic_infos_[pos_].is_optimized = function->IsOptimized();
84  char* function_name = shared->DebugName()->ToCString().release();
85  function_name_map_.insert(
86      std::make_pair(function, std::unique_ptr<char[]>(function_name)));
87  return function_name;
88}
89
90ICInfo::ICInfo()
91    : function_name(nullptr),
92      script_offset(0),
93      script_name(nullptr),
94      line_num(-1),
95      is_constructor(false),
96      is_optimized(false),
97      map(nullptr),
98      is_dictionary_map(0),
99      number_of_own_descriptors(0) {}
100
101void ICInfo::Reset() {
102  type.clear();
103  function_name = nullptr;
104  script_offset = 0;
105  script_name = nullptr;
106  line_num = -1;
107  is_constructor = false;
108  is_optimized = false;
109  state.clear();
110  map = nullptr;
111  is_dictionary_map = false;
112  number_of_own_descriptors = 0;
113  instance_type.clear();
114}
115
116void ICInfo::AppendToTracedValue(v8::tracing::TracedValue* value) const {
117  value->BeginDictionary();
118  value->SetString("type", type);
119  if (function_name) {
120    value->SetString("functionName", function_name);
121    if (is_optimized) {
122      value->SetInteger("optimized", is_optimized);
123    }
124  }
125  if (script_offset) value->SetInteger("offset", script_offset);
126  if (script_name) value->SetString("scriptName", script_name);
127  if (line_num != -1) value->SetInteger("lineNum", line_num);
128  if (is_constructor) value->SetInteger("constructor", is_constructor);
129  if (!state.empty()) value->SetString("state", state);
130  if (map) {
131    // V8 cannot represent integer above 2^53 - 1 in JavaScript from JSON,
132    // thus `map` should be converted to a string rather than an integer.
133    std::stringstream ss;
134    ss << map;
135    value->SetString("map", ss.str());
136  }
137  if (map) value->SetInteger("dict", is_dictionary_map);
138  if (map) value->SetInteger("own", number_of_own_descriptors);
139  if (!instance_type.empty()) value->SetString("instanceType", instance_type);
140  value->EndDictionary();
141}
142
143}  // namespace internal
144}  // namespace v8
145