v8/src/inspector/v8-console.cc

// 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/v8-console.h"

#include "src/base/macros.h"
#include "src/inspector/injected-script.h"
#include "src/inspector/inspected-context.h"
#include "src/inspector/string-util.h"
#include "src/inspector/v8-console-message.h"
#include "src/inspector/v8-debugger-agent-impl.h"
#include "src/inspector/v8-inspector-impl.h"
#include "src/inspector/v8-inspector-session-impl.h"
#include "src/inspector/v8-profiler-agent-impl.h"
#include "src/inspector/v8-runtime-agent-impl.h"
#include "src/inspector/v8-stack-trace-impl.h"
#include "src/inspector/v8-value-copier.h"

#include "include/v8-inspector.h"

namespace v8_inspector {

namespace {

v8::Local<v8::Private> inspectedContextPrivateKey(v8::Isolate* isolate) {
  return v8::Private::ForApi(
      isolate, toV8StringInternalized(isolate, "V8Console#InspectedContext"));
}

class ConsoleHelper {
 public:
  explicit 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;
    int contextGroupId = inspectedContext->contextGroupId();
    V8InspectorImpl* inspector = inspectedContext->inspector();
    std::unique_ptr<V8ConsoleMessage> message =
        V8ConsoleMessage::createForConsoleAPI(
            inspector->client()->currentTimeMS(), type, arguments,
            inspector->debugger()->captureStackTrace(false), inspectedContext);
    inspector->ensureConsoleMessageStorage(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>();
    v8::Local<v8::Function> func = m_info[0].As<v8::Function>();
    while (func->GetBoundFunction()->IsFunction())
      func = func->GetBoundFunction().As<v8::Function>();
    return func;
  }

  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>();
  }

  int32_t getIntFromMap(v8::Local<v8::Map> map, const String16& key,
                        int32_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 static_cast<int32_t>(intValue.As<v8::Integer>()->Value());
  }

  void setIntOnMap(v8::Local<v8::Map> map, const String16& key, int32_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;
  }

  DISALLOW_COPY_AND_ASSIGN(ConsoleHelper);
};

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(context, callback, console, 0,
                         v8::ConstructorBehavior::kThrow)
           .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(context, returnDataCallback, returnValue, 0,
                          v8::ConstructorBehavior::kThrow)
            .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 && !stackTrace->isEmpty()) {
      identifier = toString16(stackTrace->topSourceURL()) + ":" +
                   String16::fromInteger(stackTrace->topLineNumber());
    }
  } else {
    identifier = title + "@";
  }

  v8::Local<v8::Map> countMap;
  if (!helper.privateMap("V8Console#countMap").ToLocal(&countMap)) return;
  int32_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::fromDouble(elapsed, 3) + "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 (uint32_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;
  std::unique_ptr<protocol::Runtime::RemoteObject> wrappedObject;
  protocol::Response response =
      injectedScript->wrapObject(info[0], "", false /** forceValueType */,
                                 false /** generatePreview */, &wrappedObject);
  if (!response.isSuccess()) 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);
  USE(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);

  const char* jsConsoleAssert =
      "(function(){\n"
      "  var originAssert = this.assert;\n"
      "  originAssert.apply = Function.prototype.apply;\n"
      "  this.assert = assertWrapper;\n"
      "  assertWrapper.toString = () => originAssert.toString();\n"
      "  function assertWrapper(){\n"
      "    if (!!arguments[0]) return;\n"
      "    originAssert.apply(null, arguments);\n"
      "  }\n"
      "})";

  v8::Local<v8::String> assertSource = toV8String(isolate, jsConsoleAssert);
  V8InspectorImpl* inspector = inspectedContext->inspector();
  v8::Local<v8::Value> setupFunction;
  if (inspector->compileAndRunInternalScript(context, assertSource)
          .ToLocal(&setupFunction) &&
      setupFunction->IsFunction()) {
    inspector->callInternalFunction(
        v8::Local<v8::Function>::Cast(setupFunction), context, console, 0,
        nullptr);
  }

  if (hasMemoryAttribute)
    console->SetAccessorProperty(
        toV8StringInternalized(isolate, "memory"),
        v8::Function::New(context, V8Console::memoryGetterCallback, console, 0,
                          v8::ConstructorBehavior::kThrow)
            .ToLocalChecked(),
        v8::Function::New(context, V8Console::memorySetterCallback,
                          v8::Local<v8::Value>(), 0,
                          v8::ConstructorBehavior::kThrow)
            .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);
  USE(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);
    USE(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);
  USE(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 (uint32_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);
      USE(removed);
      continue;
    }
  }
}

V8Console::CommandLineAPIScope::~CommandLineAPIScope() {
  m_cleanup = true;
  v8::Local<v8::Array> names = m_installedMethods->AsArray();
  for (uint32_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);
      USE(success);
    }
  }
}

}  // namespace v8_inspector