[inspector] Initial import of v8_inspector.

src/inspector/V8Console.cpp

+// 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.
+
+#include "src/inspector/V8Console.h"
+
+#include "src/inspector/InjectedScript.h"
+#include "src/inspector/InspectedContext.h"
+#include "src/inspector/StringUtil.h"
+#include "src/inspector/V8Compat.h"
+#include "src/inspector/V8ConsoleMessage.h"
+#include "src/inspector/V8DebuggerAgentImpl.h"
+#include "src/inspector/V8InspectorImpl.h"
+#include "src/inspector/V8InspectorSessionImpl.h"
+#include "src/inspector/V8ProfilerAgentImpl.h"
+#include "src/inspector/V8RuntimeAgentImpl.h"
+#include "src/inspector/V8StackTraceImpl.h"
+#include "src/inspector/V8ValueCopier.h"
+#include "src/inspector/public/V8InspectorClient.h"
+
+namespace v8_inspector {
+
+namespace {
+
+v8::Local<v8::Private> inspectedContextPrivateKey(v8::Isolate* isolate) {
+  return v8::Private::ForApi(
+      isolate, toV8StringInternalized(isolate, "V8Console#InspectedContext"));
+}
+
+class ConsoleHelper {
+  V8_INSPECTOR_DISALLOW_COPY(ConsoleHelper);
+
+ public:
+  ConsoleHelper(const v8::FunctionCallbackInfo<v8::Value>& info)
+      : m_info(info),
+        m_isolate(info.GetIsolate()),
+        m_context(info.GetIsolate()->GetCurrentContext()),
+        m_inspectedContext(nullptr),
+        m_inspectorClient(nullptr) {}
+
+  v8::Local<v8::Object> ensureConsole() {
+    if (m_console.IsEmpty()) {
+      DCHECK(!m_info.Data().IsEmpty());
+      DCHECK(!m_info.Data()->IsUndefined());
+      m_console = m_info.Data().As<v8::Object>();
+    }
+    return m_console;
+  }
+
+  InspectedContext* ensureInspectedContext() {
+    if (m_inspectedContext) return m_inspectedContext;
+    v8::Local<v8::Object> console = ensureConsole();
+
+    v8::Local<v8::Private> key = inspectedContextPrivateKey(m_isolate);
+    v8::Local<v8::Value> inspectedContextValue;
+    if (!console->GetPrivate(m_context, key).ToLocal(&inspectedContextValue))
+      return nullptr;
+    DCHECK(inspectedContextValue->IsExternal());
+    m_inspectedContext = static_cast<InspectedContext*>(
+        inspectedContextValue.As<v8::External>()->Value());
+    return m_inspectedContext;
+  }
+
+  V8InspectorClient* ensureDebuggerClient() {
+    if (m_inspectorClient) return m_inspectorClient;
+    InspectedContext* inspectedContext = ensureInspectedContext();
+    if (!inspectedContext) return nullptr;
+    m_inspectorClient = inspectedContext->inspector()->client();
+    return m_inspectorClient;
+  }
+
+  void reportCall(ConsoleAPIType type) {
+    if (!m_info.Length()) return;
+    std::vector<v8::Local<v8::Value>> arguments;
+    for (int i = 0; i < m_info.Length(); ++i) arguments.push_back(m_info[i]);
+    reportCall(type, arguments);
+  }
+
+  void reportCallWithDefaultArgument(ConsoleAPIType type,
+                                     const String16& message) {
+    std::vector<v8::Local<v8::Value>> arguments;
+    for (int i = 0; i < m_info.Length(); ++i) arguments.push_back(m_info[i]);
+    if (!m_info.Length()) arguments.push_back(toV8String(m_isolate, message));
+    reportCall(type, arguments);
+  }
+
+  void reportCallWithArgument(ConsoleAPIType type, const String16& message) {
+    std::vector<v8::Local<v8::Value>> arguments(1,
+                                                toV8String(m_isolate, message));
+    reportCall(type, arguments);
+  }
+
+  void reportCall(ConsoleAPIType type,
+                  const std::vector<v8::Local<v8::Value>>& arguments) {
+    InspectedContext* inspectedContext = ensureInspectedContext();
+    if (!inspectedContext) return;
+    V8InspectorImpl* inspector = inspectedContext->inspector();
+    std::unique_ptr<V8ConsoleMessage> message =
+        V8ConsoleMessage::createForConsoleAPI(
+            inspector->client()->currentTimeMS(), type, arguments,
+            inspector->debugger()->captureStackTrace(false), inspectedContext);
+    inspector->ensureConsoleMessageStorage(inspectedContext->contextGroupId())
+        ->addMessage(std::move(message));
+  }
+
+  void reportDeprecatedCall(const char* id, const String16& message) {
+    if (checkAndSetPrivateFlagOnConsole(id, false)) return;
+    std::vector<v8::Local<v8::Value>> arguments(1,
+                                                toV8String(m_isolate, message));
+    reportCall(ConsoleAPIType::kWarning, arguments);
+  }
+
+  bool firstArgToBoolean(bool defaultValue) {
+    if (m_info.Length() < 1) return defaultValue;
+    if (m_info[0]->IsBoolean()) return m_info[0].As<v8::Boolean>()->Value();
+    return m_info[0]->BooleanValue(m_context).FromMaybe(defaultValue);
+  }
+
+  String16 firstArgToString(const String16& defaultValue) {
+    if (m_info.Length() < 1) return defaultValue;
+    v8::Local<v8::String> titleValue;
+    if (m_info[0]->IsObject()) {
+      if (!m_info[0].As<v8::Object>()->ObjectProtoToString(m_context).ToLocal(
+              &titleValue))
+        return defaultValue;
+    } else {
+      if (!m_info[0]->ToString(m_context).ToLocal(&titleValue))
+        return defaultValue;
+    }
+    return toProtocolString(titleValue);
+  }
+
+  v8::MaybeLocal<v8::Object> firstArgAsObject() {
+    if (m_info.Length() < 1 || !m_info[0]->IsObject())
+      return v8::MaybeLocal<v8::Object>();
+    return m_info[0].As<v8::Object>();
+  }
+
+  v8::MaybeLocal<v8::Function> firstArgAsFunction() {
+    if (m_info.Length() < 1 || !m_info[0]->IsFunction())
+      return v8::MaybeLocal<v8::Function>();
+    return m_info[0].As<v8::Function>();
+  }
+
+  v8::MaybeLocal<v8::Map> privateMap(const char* name) {
+    v8::Local<v8::Object> console = ensureConsole();
+    v8::Local<v8::Private> privateKey =
+        v8::Private::ForApi(m_isolate, toV8StringInternalized(m_isolate, name));
+    v8::Local<v8::Value> mapValue;
+    if (!console->GetPrivate(m_context, privateKey).ToLocal(&mapValue))
+      return v8::MaybeLocal<v8::Map>();
+    if (mapValue->IsUndefined()) {
+      v8::Local<v8::Map> map = v8::Map::New(m_isolate);
+      if (!console->SetPrivate(m_context, privateKey, map).FromMaybe(false))
+        return v8::MaybeLocal<v8::Map>();
+      return map;
+    }
+    return mapValue->IsMap() ? mapValue.As<v8::Map>()
+                             : v8::MaybeLocal<v8::Map>();
+  }
+
+  int64_t getIntFromMap(v8::Local<v8::Map> map, const String16& key,
+                        int64_t defaultValue) {
+    v8::Local<v8::String> v8Key = toV8String(m_isolate, key);
+    if (!map->Has(m_context, v8Key).FromMaybe(false)) return defaultValue;
+    v8::Local<v8::Value> intValue;
+    if (!map->Get(m_context, v8Key).ToLocal(&intValue)) return defaultValue;
+    return intValue.As<v8::Integer>()->Value();
+  }
+
+  void setIntOnMap(v8::Local<v8::Map> map, const String16& key, int64_t value) {
+    v8::Local<v8::String> v8Key = toV8String(m_isolate, key);
+    if (!map->Set(m_context, v8Key, v8::Integer::New(m_isolate, value))
+             .ToLocal(&map))
+      return;
+  }
+
+  double getDoubleFromMap(v8::Local<v8::Map> map, const String16& key,
+                          double defaultValue) {
+    v8::Local<v8::String> v8Key = toV8String(m_isolate, key);
+    if (!map->Has(m_context, v8Key).FromMaybe(false)) return defaultValue;
+    v8::Local<v8::Value> intValue;
+    if (!map->Get(m_context, v8Key).ToLocal(&intValue)) return defaultValue;
+    return intValue.As<v8::Number>()->Value();
+  }
+
+  void setDoubleOnMap(v8::Local<v8::Map> map, const String16& key,
+                      double value) {
+    v8::Local<v8::String> v8Key = toV8String(m_isolate, key);
+    if (!map->Set(m_context, v8Key, v8::Number::New(m_isolate, value))
+             .ToLocal(&map))
+      return;
+  }
+
+  V8ProfilerAgentImpl* profilerAgent() {
+    if (V8InspectorSessionImpl* session = currentSession()) {
+      if (session && session->profilerAgent()->enabled())
+        return session->profilerAgent();
+    }
+    return nullptr;
+  }
+
+  V8DebuggerAgentImpl* debuggerAgent() {
+    if (V8InspectorSessionImpl* session = currentSession()) {
+      if (session && session->debuggerAgent()->enabled())
+        return session->debuggerAgent();
+    }
+    return nullptr;
+  }
+
+  V8InspectorSessionImpl* currentSession() {
+    InspectedContext* inspectedContext = ensureInspectedContext();
+    if (!inspectedContext) return nullptr;
+    return inspectedContext->inspector()->sessionForContextGroup(
+        inspectedContext->contextGroupId());
+  }
+
+ private:
+  const v8::FunctionCallbackInfo<v8::Value>& m_info;
+  v8::Isolate* m_isolate;
+  v8::Local<v8::Context> m_context;
+  v8::Local<v8::Object> m_console;
+  InspectedContext* m_inspectedContext;
+  V8InspectorClient* m_inspectorClient;
+
+  bool checkAndSetPrivateFlagOnConsole(const char* name, bool defaultValue) {
+    v8::Local<v8::Object> console = ensureConsole();
+    v8::Local<v8::Private> key =
+        v8::Private::ForApi(m_isolate, toV8StringInternalized(m_isolate, name));
+    v8::Local<v8::Value> flagValue;
+    if (!console->GetPrivate(m_context, key).ToLocal(&flagValue))
+      return defaultValue;
+    DCHECK(flagValue->IsUndefined() || flagValue->IsBoolean());
+    if (flagValue->IsBoolean()) {
+      DCHECK(flagValue.As<v8::Boolean>()->Value());
+      return true;
+    }
+    if (!console->SetPrivate(m_context, key, v8::True(m_isolate))
+             .FromMaybe(false))
+      return defaultValue;
+    return false;
+  }
+};
+
+void returnDataCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  info.GetReturnValue().Set(info.Data());
+}
+
+void createBoundFunctionProperty(v8::Local<v8::Context> context,
+                                 v8::Local<v8::Object> console,
+                                 const char* name,
+                                 v8::FunctionCallback callback,
+                                 const char* description = nullptr) {
+  v8::Local<v8::String> funcName =
+      toV8StringInternalized(context->GetIsolate(), name);
+  v8::Local<v8::Function> func;
+  if (!V8_FUNCTION_NEW_REMOVE_PROTOTYPE(context, callback, console, 0)
+           .ToLocal(&func))
+    return;
+  func->SetName(funcName);
+  if (description) {
+    v8::Local<v8::String> returnValue =
+        toV8String(context->GetIsolate(), description);
+    v8::Local<v8::Function> toStringFunction;
+    if (V8_FUNCTION_NEW_REMOVE_PROTOTYPE(context, returnDataCallback,
+                                         returnValue, 0)
+            .ToLocal(&toStringFunction))
+      createDataProperty(context, func, toV8StringInternalized(
+                                            context->GetIsolate(), "toString"),
+                         toStringFunction);
+  }
+  createDataProperty(context, console, funcName, func);
+}
+
+}  // namespace
+
+void V8Console::debugCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCall(ConsoleAPIType::kDebug);
+}
+
+void V8Console::errorCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCall(ConsoleAPIType::kError);
+}
+
+void V8Console::infoCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCall(ConsoleAPIType::kInfo);
+}
+
+void V8Console::logCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCall(ConsoleAPIType::kLog);
+}
+
+void V8Console::warnCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCall(ConsoleAPIType::kWarning);
+}
+
+void V8Console::dirCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCall(ConsoleAPIType::kDir);
+}
+
+void V8Console::dirxmlCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCall(ConsoleAPIType::kDirXML);
+}
+
+void V8Console::tableCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCall(ConsoleAPIType::kTable);
+}
+
+void V8Console::traceCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCallWithDefaultArgument(ConsoleAPIType::kTrace,
+                                                    String16("console.trace"));
+}
+
+void V8Console::groupCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCallWithDefaultArgument(ConsoleAPIType::kStartGroup,
+                                                    String16("console.group"));
+}
+
+void V8Console::groupCollapsedCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCallWithDefaultArgument(
+      ConsoleAPIType::kStartGroupCollapsed, String16("console.groupCollapsed"));
+}
+
+void V8Console::groupEndCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCallWithDefaultArgument(
+      ConsoleAPIType::kEndGroup, String16("console.groupEnd"));
+}
+
+void V8Console::clearCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportCallWithDefaultArgument(ConsoleAPIType::kClear,
+                                                    String16("console.clear"));
+}
+
+void V8Console::countCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+
+  String16 title = helper.firstArgToString(String16());
+  String16 identifier;
+  if (title.isEmpty()) {
+    std::unique_ptr<V8StackTraceImpl> stackTrace =
+        V8StackTraceImpl::capture(nullptr, 0, 1);
+    if (stackTrace)
+      identifier = toString16(stackTrace->topSourceURL()) + ":" +
+                   String16::fromInteger(stackTrace->topLineNumber());
+  } else {
+    identifier = title + "@";
+  }
+
+  v8::Local<v8::Map> countMap;
+  if (!helper.privateMap("V8Console#countMap").ToLocal(&countMap)) return;
+  int64_t count = helper.getIntFromMap(countMap, identifier, 0) + 1;
+  helper.setIntOnMap(countMap, identifier, count);
+  helper.reportCallWithArgument(ConsoleAPIType::kCount,
+                                title + ": " + String16::fromInteger(count));
+}
+
+void V8Console::assertCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+  if (helper.firstArgToBoolean(false)) return;
+
+  std::vector<v8::Local<v8::Value>> arguments;
+  for (int i = 1; i < info.Length(); ++i) arguments.push_back(info[i]);
+  if (info.Length() < 2)
+    arguments.push_back(
+        toV8String(info.GetIsolate(), String16("console.assert")));
+  helper.reportCall(ConsoleAPIType::kAssert, arguments);
+
+  if (V8DebuggerAgentImpl* debuggerAgent = helper.debuggerAgent())
+    debuggerAgent->breakProgramOnException(
+        protocol::Debugger::Paused::ReasonEnum::Assert, nullptr);
+}
+
+void V8Console::markTimelineCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportDeprecatedCall("V8Console#markTimelineDeprecated",
+                                           "'console.markTimeline' is "
+                                           "deprecated. Please use "
+                                           "'console.timeStamp' instead.");
+  timeStampCallback(info);
+}
+
+void V8Console::profileCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+  if (V8ProfilerAgentImpl* profilerAgent = helper.profilerAgent())
+    profilerAgent->consoleProfile(helper.firstArgToString(String16()));
+}
+
+void V8Console::profileEndCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+  if (V8ProfilerAgentImpl* profilerAgent = helper.profilerAgent())
+    profilerAgent->consoleProfileEnd(helper.firstArgToString(String16()));
+}
+
+static void timeFunction(const v8::FunctionCallbackInfo<v8::Value>& info,
+                         bool timelinePrefix) {
+  ConsoleHelper helper(info);
+  if (V8InspectorClient* client = helper.ensureDebuggerClient()) {
+    String16 protocolTitle = helper.firstArgToString("default");
+    if (timelinePrefix) protocolTitle = "Timeline '" + protocolTitle + "'";
+    client->consoleTime(toStringView(protocolTitle));
+
+    v8::Local<v8::Map> timeMap;
+    if (!helper.privateMap("V8Console#timeMap").ToLocal(&timeMap)) return;
+    helper.setDoubleOnMap(timeMap, protocolTitle, client->currentTimeMS());
+  }
+}
+
+static void timeEndFunction(const v8::FunctionCallbackInfo<v8::Value>& info,
+                            bool timelinePrefix) {
+  ConsoleHelper helper(info);
+  if (V8InspectorClient* client = helper.ensureDebuggerClient()) {
+    String16 protocolTitle = helper.firstArgToString("default");
+    if (timelinePrefix) protocolTitle = "Timeline '" + protocolTitle + "'";
+    client->consoleTimeEnd(toStringView(protocolTitle));
+
+    v8::Local<v8::Map> timeMap;
+    if (!helper.privateMap("V8Console#timeMap").ToLocal(&timeMap)) return;
+    double elapsed = client->currentTimeMS() -
+                     helper.getDoubleFromMap(timeMap, protocolTitle, 0.0);
+    String16 message =
+        protocolTitle + ": " + String16::fromDoublePrecision3(elapsed) + "ms";
+    helper.reportCallWithArgument(ConsoleAPIType::kTimeEnd, message);
+  }
+}
+
+void V8Console::timelineCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportDeprecatedCall(
+      "V8Console#timeline",
+      "'console.timeline' is deprecated. Please use 'console.time' instead.");
+  timeFunction(info, true);
+}
+
+void V8Console::timelineEndCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper(info).reportDeprecatedCall("V8Console#timelineEnd",
+                                           "'console.timelineEnd' is "
+                                           "deprecated. Please use "
+                                           "'console.timeEnd' instead.");
+  timeEndFunction(info, true);
+}
+
+void V8Console::timeCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  timeFunction(info, false);
+}
+
+void V8Console::timeEndCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  timeEndFunction(info, false);
+}
+
+void V8Console::timeStampCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+  if (V8InspectorClient* client = helper.ensureDebuggerClient()) {
+    String16 title = helper.firstArgToString(String16());
+    client->consoleTimeStamp(toStringView(title));
+  }
+}
+
+void V8Console::memoryGetterCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  if (V8InspectorClient* client = ConsoleHelper(info).ensureDebuggerClient()) {
+    v8::Local<v8::Value> memoryValue;
+    if (!client
+             ->memoryInfo(info.GetIsolate(),
+                          info.GetIsolate()->GetCurrentContext())
+             .ToLocal(&memoryValue))
+      return;
+    info.GetReturnValue().Set(memoryValue);
+  }
+}
+
+void V8Console::memorySetterCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  // We can't make the attribute readonly as it breaks existing code that relies
+  // on being able to assign to console.memory in strict mode. Instead, the
+  // setter just ignores the passed value.  http://crbug.com/468611
+}
+
+void V8Console::keysCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  v8::Isolate* isolate = info.GetIsolate();
+  info.GetReturnValue().Set(v8::Array::New(isolate));
+
+  ConsoleHelper helper(info);
+  v8::Local<v8::Object> obj;
+  if (!helper.firstArgAsObject().ToLocal(&obj)) return;
+  v8::Local<v8::Array> names;
+  if (!obj->GetOwnPropertyNames(isolate->GetCurrentContext()).ToLocal(&names))
+    return;
+  info.GetReturnValue().Set(names);
+}
+
+void V8Console::valuesCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  v8::Isolate* isolate = info.GetIsolate();
+  info.GetReturnValue().Set(v8::Array::New(isolate));
+
+  ConsoleHelper helper(info);
+  v8::Local<v8::Object> obj;
+  if (!helper.firstArgAsObject().ToLocal(&obj)) return;
+  v8::Local<v8::Array> names;
+  v8::Local<v8::Context> context = isolate->GetCurrentContext();
+  if (!obj->GetOwnPropertyNames(context).ToLocal(&names)) return;
+  v8::Local<v8::Array> values = v8::Array::New(isolate, names->Length());
+  for (size_t i = 0; i < names->Length(); ++i) {
+    v8::Local<v8::Value> key;
+    if (!names->Get(context, i).ToLocal(&key)) continue;
+    v8::Local<v8::Value> value;
+    if (!obj->Get(context, key).ToLocal(&value)) continue;
+    createDataProperty(context, values, i, value);
+  }
+  info.GetReturnValue().Set(values);
+}
+
+static void setFunctionBreakpoint(ConsoleHelper& helper,
+                                  v8::Local<v8::Function> function,
+                                  V8DebuggerAgentImpl::BreakpointSource source,
+                                  const String16& condition, bool enable) {
+  V8DebuggerAgentImpl* debuggerAgent = helper.debuggerAgent();
+  if (!debuggerAgent) return;
+  String16 scriptId = String16::fromInteger(function->ScriptId());
+  int lineNumber = function->GetScriptLineNumber();
+  int columnNumber = function->GetScriptColumnNumber();
+  if (lineNumber == v8::Function::kLineOffsetNotFound ||
+      columnNumber == v8::Function::kLineOffsetNotFound)
+    return;
+  if (enable)
+    debuggerAgent->setBreakpointAt(scriptId, lineNumber, columnNumber, source,
+                                   condition);
+  else
+    debuggerAgent->removeBreakpointAt(scriptId, lineNumber, columnNumber,
+                                      source);
+}
+
+void V8Console::debugFunctionCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+  v8::Local<v8::Function> function;
+  if (!helper.firstArgAsFunction().ToLocal(&function)) return;
+  setFunctionBreakpoint(helper, function,
+                        V8DebuggerAgentImpl::DebugCommandBreakpointSource,
+                        String16(), true);
+}
+
+void V8Console::undebugFunctionCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+  v8::Local<v8::Function> function;
+  if (!helper.firstArgAsFunction().ToLocal(&function)) return;
+  setFunctionBreakpoint(helper, function,
+                        V8DebuggerAgentImpl::DebugCommandBreakpointSource,
+                        String16(), false);
+}
+
+void V8Console::monitorFunctionCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+  v8::Local<v8::Function> function;
+  if (!helper.firstArgAsFunction().ToLocal(&function)) return;
+  v8::Local<v8::Value> name = function->GetName();
+  if (!name->IsString() || !v8::Local<v8::String>::Cast(name)->Length())
+    name = function->GetInferredName();
+  String16 functionName = toProtocolStringWithTypeCheck(name);
+  String16Builder builder;
+  builder.append("console.log(\"function ");
+  if (functionName.isEmpty())
+    builder.append("(anonymous function)");
+  else
+    builder.append(functionName);
+  builder.append(
+      " called\" + (arguments.length > 0 ? \" with arguments: \" + "
+      "Array.prototype.join.call(arguments, \", \") : \"\")) && false");
+  setFunctionBreakpoint(helper, function,
+                        V8DebuggerAgentImpl::MonitorCommandBreakpointSource,
+                        builder.toString(), true);
+}
+
+void V8Console::unmonitorFunctionCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+  v8::Local<v8::Function> function;
+  if (!helper.firstArgAsFunction().ToLocal(&function)) return;
+  setFunctionBreakpoint(helper, function,
+                        V8DebuggerAgentImpl::MonitorCommandBreakpointSource,
+                        String16(), false);
+}
+
+void V8Console::lastEvaluationResultCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  ConsoleHelper helper(info);
+  InspectedContext* context = helper.ensureInspectedContext();
+  if (!context) return;
+  if (InjectedScript* injectedScript = context->getInjectedScript())
+    info.GetReturnValue().Set(injectedScript->lastEvaluationResult());
+}
+
+static void inspectImpl(const v8::FunctionCallbackInfo<v8::Value>& info,
+                        bool copyToClipboard) {
+  if (info.Length() < 1) return;
+  if (!copyToClipboard) info.GetReturnValue().Set(info[0]);
+
+  ConsoleHelper helper(info);
+  InspectedContext* context = helper.ensureInspectedContext();
+  if (!context) return;
+  InjectedScript* injectedScript = context->getInjectedScript();
+  if (!injectedScript) return;
+  ErrorString errorString;
+  std::unique_ptr<protocol::Runtime::RemoteObject> wrappedObject =
+      injectedScript->wrapObject(&errorString, info[0], "",
+                                 false /** forceValueType */,
+                                 false /** generatePreview */);
+  if (!wrappedObject || !errorString.isEmpty()) return;
+
+  std::unique_ptr<protocol::DictionaryValue> hints =
+      protocol::DictionaryValue::create();
+  if (copyToClipboard) hints->setBoolean("copyToClipboard", true);
+  if (V8InspectorSessionImpl* session = helper.currentSession())
+    session->runtimeAgent()->inspect(std::move(wrappedObject),
+                                     std::move(hints));
+}
+
+void V8Console::inspectCallback(
+    const v8::FunctionCallbackInfo<v8::Value>& info) {
+  inspectImpl(info, false);
+}
+
+void V8Console::copyCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+  inspectImpl(info, true);
+}
+
+void V8Console::inspectedObject(const v8::FunctionCallbackInfo<v8::Value>& info,
+                                unsigned num) {
+  DCHECK(num < V8InspectorSessionImpl::kInspectedObjectBufferSize);
+  ConsoleHelper helper(info);
+  if (V8InspectorSessionImpl* session = helper.currentSession()) {
+    V8InspectorSession::Inspectable* object = session->inspectedObject(num);
+    v8::Isolate* isolate = info.GetIsolate();
+    if (object)
+      info.GetReturnValue().Set(object->get(isolate->GetCurrentContext()));
+    else
+      info.GetReturnValue().Set(v8::Undefined(isolate));
+  }
+}
+
+v8::Local<v8::Object> V8Console::createConsole(
+    InspectedContext* inspectedContext, bool hasMemoryAttribute) {
+  v8::Local<v8::Context> context = inspectedContext->context();
+  v8::Context::Scope contextScope(context);
+  v8::Isolate* isolate = context->GetIsolate();
+  v8::MicrotasksScope microtasksScope(isolate,
+                                      v8::MicrotasksScope::kDoNotRunMicrotasks);
+
+  v8::Local<v8::Object> console = v8::Object::New(isolate);
+  bool success =
+      console->SetPrototype(context, v8::Object::New(isolate)).FromMaybe(false);
+  DCHECK(success);
+
+  createBoundFunctionProperty(context, console, "debug",
+                              V8Console::debugCallback);
+  createBoundFunctionProperty(context, console, "error",
+                              V8Console::errorCallback);
+  createBoundFunctionProperty(context, console, "info",
+                              V8Console::infoCallback);
+  createBoundFunctionProperty(context, console, "log", V8Console::logCallback);
+  createBoundFunctionProperty(context, console, "warn",
+                              V8Console::warnCallback);
+  createBoundFunctionProperty(context, console, "dir", V8Console::dirCallback);
+  createBoundFunctionProperty(context, console, "dirxml",
+                              V8Console::dirxmlCallback);
+  createBoundFunctionProperty(context, console, "table",
+                              V8Console::tableCallback);
+  createBoundFunctionProperty(context, console, "trace",
+                              V8Console::traceCallback);
+  createBoundFunctionProperty(context, console, "group",
+                              V8Console::groupCallback);
+  createBoundFunctionProperty(context, console, "groupCollapsed",
+                              V8Console::groupCollapsedCallback);
+  createBoundFunctionProperty(context, console, "groupEnd",
+                              V8Console::groupEndCallback);
+  createBoundFunctionProperty(context, console, "clear",
+                              V8Console::clearCallback);
+  createBoundFunctionProperty(context, console, "count",
+                              V8Console::countCallback);
+  createBoundFunctionProperty(context, console, "assert",
+                              V8Console::assertCallback);
+  createBoundFunctionProperty(context, console, "markTimeline",
+                              V8Console::markTimelineCallback);
+  createBoundFunctionProperty(context, console, "profile",
+                              V8Console::profileCallback);
+  createBoundFunctionProperty(context, console, "profileEnd",
+                              V8Console::profileEndCallback);
+  createBoundFunctionProperty(context, console, "timeline",
+                              V8Console::timelineCallback);
+  createBoundFunctionProperty(context, console, "timelineEnd",
+                              V8Console::timelineEndCallback);
+  createBoundFunctionProperty(context, console, "time",
+                              V8Console::timeCallback);
+  createBoundFunctionProperty(context, console, "timeEnd",
+                              V8Console::timeEndCallback);
+  createBoundFunctionProperty(context, console, "timeStamp",
+                              V8Console::timeStampCallback);
+
+  if (hasMemoryAttribute)
+    console->SetAccessorProperty(
+        toV8StringInternalized(isolate, "memory"),
+        V8_FUNCTION_NEW_REMOVE_PROTOTYPE(
+            context, V8Console::memoryGetterCallback, console, 0)
+            .ToLocalChecked(),
+        V8_FUNCTION_NEW_REMOVE_PROTOTYPE(
+            context, V8Console::memorySetterCallback, v8::Local<v8::Value>(), 0)
+            .ToLocalChecked(),
+        static_cast<v8::PropertyAttribute>(v8::None), v8::DEFAULT);
+
+  console->SetPrivate(context, inspectedContextPrivateKey(isolate),
+                      v8::External::New(isolate, inspectedContext));
+  return console;
+}
+
+void V8Console::clearInspectedContextIfNeeded(v8::Local<v8::Context> context,
+                                              v8::Local<v8::Object> console) {
+  v8::Isolate* isolate = context->GetIsolate();
+  console->SetPrivate(context, inspectedContextPrivateKey(isolate),
+                      v8::External::New(isolate, nullptr));
+}
+
+v8::Local<v8::Object> V8Console::createCommandLineAPI(
+    InspectedContext* inspectedContext) {
+  v8::Local<v8::Context> context = inspectedContext->context();
+  v8::Isolate* isolate = context->GetIsolate();
+  v8::MicrotasksScope microtasksScope(isolate,
+                                      v8::MicrotasksScope::kDoNotRunMicrotasks);
+
+  v8::Local<v8::Object> commandLineAPI = v8::Object::New(isolate);
+  bool success =
+      commandLineAPI->SetPrototype(context, v8::Null(isolate)).FromMaybe(false);
+  DCHECK(success);
+
+  createBoundFunctionProperty(context, commandLineAPI, "dir",
+                              V8Console::dirCallback,
+                              "function dir(value) { [Command Line API] }");
+  createBoundFunctionProperty(context, commandLineAPI, "dirxml",
+                              V8Console::dirxmlCallback,
+                              "function dirxml(value) { [Command Line API] }");
+  createBoundFunctionProperty(context, commandLineAPI, "profile",
+                              V8Console::profileCallback,
+                              "function profile(title) { [Command Line API] }");
+  createBoundFunctionProperty(
+      context, commandLineAPI, "profileEnd", V8Console::profileEndCallback,
+      "function profileEnd(title) { [Command Line API] }");
+  createBoundFunctionProperty(context, commandLineAPI, "clear",
+                              V8Console::clearCallback,
+                              "function clear() { [Command Line API] }");
+  createBoundFunctionProperty(
+      context, commandLineAPI, "table", V8Console::tableCallback,
+      "function table(data, [columns]) { [Command Line API] }");
+
+  createBoundFunctionProperty(context, commandLineAPI, "keys",
+                              V8Console::keysCallback,
+                              "function keys(object) { [Command Line API] }");
+  createBoundFunctionProperty(context, commandLineAPI, "values",
+                              V8Console::valuesCallback,
+                              "function values(object) { [Command Line API] }");
+  createBoundFunctionProperty(
+      context, commandLineAPI, "debug", V8Console::debugFunctionCallback,
+      "function debug(function) { [Command Line API] }");
+  createBoundFunctionProperty(
+      context, commandLineAPI, "undebug", V8Console::undebugFunctionCallback,
+      "function undebug(function) { [Command Line API] }");
+  createBoundFunctionProperty(
+      context, commandLineAPI, "monitor", V8Console::monitorFunctionCallback,
+      "function monitor(function) { [Command Line API] }");
+  createBoundFunctionProperty(
+      context, commandLineAPI, "unmonitor",
+      V8Console::unmonitorFunctionCallback,
+      "function unmonitor(function) { [Command Line API] }");
+  createBoundFunctionProperty(
+      context, commandLineAPI, "inspect", V8Console::inspectCallback,
+      "function inspect(object) { [Command Line API] }");
+  createBoundFunctionProperty(context, commandLineAPI, "copy",
+                              V8Console::copyCallback,
+                              "function copy(value) { [Command Line API] }");
+  createBoundFunctionProperty(context, commandLineAPI, "$_",
+                              V8Console::lastEvaluationResultCallback);
+  createBoundFunctionProperty(context, commandLineAPI, "$0",
+                              V8Console::inspectedObject0);
+  createBoundFunctionProperty(context, commandLineAPI, "$1",
+                              V8Console::inspectedObject1);
+  createBoundFunctionProperty(context, commandLineAPI, "$2",
+                              V8Console::inspectedObject2);
+  createBoundFunctionProperty(context, commandLineAPI, "$3",
+                              V8Console::inspectedObject3);
+  createBoundFunctionProperty(context, commandLineAPI, "$4",
+                              V8Console::inspectedObject4);
+
+  inspectedContext->inspector()->client()->installAdditionalCommandLineAPI(
+      context, commandLineAPI);
+
+  commandLineAPI->SetPrivate(context, inspectedContextPrivateKey(isolate),
+                             v8::External::New(isolate, inspectedContext));
+  return commandLineAPI;
+}
+
+static bool isCommandLineAPIGetter(const String16& name) {
+  if (name.length() != 2) return false;
+  // $0 ... $4, $_
+  return name[0] == '$' &&
+         ((name[1] >= '0' && name[1] <= '4') || name[1] == '_');
+}
+
+void V8Console::CommandLineAPIScope::accessorGetterCallback(
+    v8::Local<v8::Name> name, const v8::PropertyCallbackInfo<v8::Value>& info) {
+  CommandLineAPIScope* scope = static_cast<CommandLineAPIScope*>(
+      info.Data().As<v8::External>()->Value());
+  DCHECK(scope);
+
+  v8::Local<v8::Context> context = info.GetIsolate()->GetCurrentContext();
+  if (scope->m_cleanup) {
+    bool removed = info.Holder()->Delete(context, name).FromMaybe(false);
+    DCHECK(removed);
+    return;
+  }
+  v8::Local<v8::Object> commandLineAPI = scope->m_commandLineAPI;
+
+  v8::Local<v8::Value> value;
+  if (!commandLineAPI->Get(context, name).ToLocal(&value)) return;
+  if (isCommandLineAPIGetter(toProtocolStringWithTypeCheck(name))) {
+    DCHECK(value->IsFunction());
+    v8::MicrotasksScope microtasks(info.GetIsolate(),
+                                   v8::MicrotasksScope::kDoNotRunMicrotasks);
+    if (value.As<v8::Function>()
+            ->Call(context, commandLineAPI, 0, nullptr)
+            .ToLocal(&value))
+      info.GetReturnValue().Set(value);
+  } else {
+    info.GetReturnValue().Set(value);
+  }
+}
+
+void V8Console::CommandLineAPIScope::accessorSetterCallback(
+    v8::Local<v8::Name> name, v8::Local<v8::Value> value,
+    const v8::PropertyCallbackInfo<void>& info) {
+  CommandLineAPIScope* scope = static_cast<CommandLineAPIScope*>(
+      info.Data().As<v8::External>()->Value());
+  v8::Local<v8::Context> context = info.GetIsolate()->GetCurrentContext();
+  if (!info.Holder()->Delete(context, name).FromMaybe(false)) return;
+  if (!info.Holder()->CreateDataProperty(context, name, value).FromMaybe(false))
+    return;
+  bool removed =
+      scope->m_installedMethods->Delete(context, name).FromMaybe(false);
+  DCHECK(removed);
+}
+
+V8Console::CommandLineAPIScope::CommandLineAPIScope(
+    v8::Local<v8::Context> context, v8::Local<v8::Object> commandLineAPI,
+    v8::Local<v8::Object> global)
+    : m_context(context),
+      m_commandLineAPI(commandLineAPI),
+      m_global(global),
+      m_installedMethods(v8::Set::New(context->GetIsolate())),
+      m_cleanup(false) {
+  v8::Local<v8::Array> names;
+  if (!m_commandLineAPI->GetOwnPropertyNames(context).ToLocal(&names)) return;
+  v8::Local<v8::External> externalThis =
+      v8::External::New(context->GetIsolate(), this);
+  for (size_t i = 0; i < names->Length(); ++i) {
+    v8::Local<v8::Value> name;
+    if (!names->Get(context, i).ToLocal(&name) || !name->IsName()) continue;
+    if (m_global->Has(context, name).FromMaybe(true)) continue;
+    if (!m_installedMethods->Add(context, name).ToLocal(&m_installedMethods))
+      continue;
+    if (!m_global
+             ->SetAccessor(context, v8::Local<v8::Name>::Cast(name),
+                           CommandLineAPIScope::accessorGetterCallback,
+                           CommandLineAPIScope::accessorSetterCallback,
+                           externalThis, v8::DEFAULT, v8::DontEnum)
+             .FromMaybe(false)) {
+      bool removed = m_installedMethods->Delete(context, name).FromMaybe(false);
+      DCHECK(removed);
+      continue;
+    }
+  }
+}
+
+V8Console::CommandLineAPIScope::~CommandLineAPIScope() {
+  m_cleanup = true;
+  v8::Local<v8::Array> names = m_installedMethods->AsArray();
+  for (size_t i = 0; i < names->Length(); ++i) {
+    v8::Local<v8::Value> name;
+    if (!names->Get(m_context, i).ToLocal(&name) || !name->IsName()) continue;
+    if (name->IsString()) {
+      v8::Local<v8::Value> descriptor;
+      bool success = m_global
+                         ->GetOwnPropertyDescriptor(
+                             m_context, v8::Local<v8::String>::Cast(name))
+                         .ToLocal(&descriptor);
+      DCHECK(success);
+    }
+  }
+}
+
+}  // namespace v8_inspector