Bring back ScriptDebugServer and associated machinery

sky/engine/bindings/core/v8/ScriptDebugServer.cpp

+/*
+ * Copyright (c) 2010-2011 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "bindings/core/v8/ScriptDebugServer.h"
+
+#include "bindings/core/v8/ScopedPersistent.h"
+#include "bindings/core/v8/ScriptCallStackFactory.h"
+#include "bindings/core/v8/ScriptController.h"
+#include "bindings/core/v8/ScriptSourceCode.h"
+#include "bindings/core/v8/ScriptValue.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8JavaScriptCallFrame.h"
+#include "bindings/core/v8/V8ScriptRunner.h"
+#include "core/inspector/JavaScriptCallFrame.h"
+#include "core/inspector/ScriptDebugListener.h"
+#include "platform/JSONValues.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebData.h"
+#include "wtf/StdLibExtras.h"
+#include "wtf/Vector.h"
+#include "wtf/dtoa/utils.h"
+#include "wtf/text/CString.h"
+
+namespace blink {
+
+namespace {
+
+class ClientDataImpl : public v8::Debug::ClientData {
+public:
+    ClientDataImpl(PassOwnPtr<ScriptDebugServer::Task> task) : m_task(task) { }
+    virtual ~ClientDataImpl() { }
+    ScriptDebugServer::Task* task() const { return m_task.get(); }
+private:
+    OwnPtr<ScriptDebugServer::Task> m_task;
+};
+
+const char stepIntoV8MethodName[] = "stepIntoStatement";
+const char stepOutV8MethodName[] = "stepOutOfFunction";
+}
+
+v8::Local<v8::Value> ScriptDebugServer::callDebuggerMethod(const char* functionName, int argc, v8::Handle<v8::Value> argv[])
+{
+    v8::Handle<v8::Object> debuggerScript = m_debuggerScript.newLocal(m_isolate);
+    v8::Handle<v8::Function> function = v8::Local<v8::Function>::Cast(debuggerScript->Get(v8AtomicString(m_isolate, functionName)));
+    ASSERT(m_isolate->InContext());
+    return V8ScriptRunner::callInternalFunction(function, debuggerScript, argc, argv, m_isolate);
+}
+
+ScriptDebugServer::ScriptDebugServer(v8::Isolate* isolate)
+    : m_pauseOnExceptionsState(DontPauseOnExceptions)
+    , m_breakpointsActivated(true)
+    , m_isolate(isolate)
+    , m_runningNestedMessageLoop(false)
+{
+}
+
+ScriptDebugServer::~ScriptDebugServer()
+{
+}
+
+String ScriptDebugServer::setBreakpoint(const String& sourceID, const ScriptBreakpoint& scriptBreakpoint, int* actualLineNumber, int* actualColumnNumber, bool interstatementLocation)
+{
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
+    v8::Context::Scope contextScope(debuggerContext);
+
+    v8::Local<v8::Object> info = v8::Object::New(m_isolate);
+    info->Set(v8AtomicString(m_isolate, "sourceID"), v8String(debuggerContext->GetIsolate(), sourceID));
+    info->Set(v8AtomicString(m_isolate, "lineNumber"), v8::Integer::New(debuggerContext->GetIsolate(), scriptBreakpoint.lineNumber));
+    info->Set(v8AtomicString(m_isolate, "columnNumber"), v8::Integer::New(debuggerContext->GetIsolate(), scriptBreakpoint.columnNumber));
+    info->Set(v8AtomicString(m_isolate, "interstatementLocation"), v8Boolean(interstatementLocation, debuggerContext->GetIsolate()));
+    info->Set(v8AtomicString(m_isolate, "condition"), v8String(debuggerContext->GetIsolate(), scriptBreakpoint.condition));
+
+    v8::Handle<v8::Function> setBreakpointFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "setBreakpoint")));
+    v8::Handle<v8::Value> breakpointId = v8::Debug::Call(setBreakpointFunction, info);
+    if (breakpointId.IsEmpty() || !breakpointId->IsString())
+        return "";
+    *actualLineNumber = info->Get(v8AtomicString(m_isolate, "lineNumber"))->Int32Value();
+    *actualColumnNumber = info->Get(v8AtomicString(m_isolate, "columnNumber"))->Int32Value();
+    return toCoreString(breakpointId.As<v8::String>());
+}
+
+void ScriptDebugServer::removeBreakpoint(const String& breakpointId)
+{
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
+    v8::Context::Scope contextScope(debuggerContext);
+
+    v8::Local<v8::Object> info = v8::Object::New(m_isolate);
+    info->Set(v8AtomicString(m_isolate, "breakpointId"), v8String(debuggerContext->GetIsolate(), breakpointId));
+
+    v8::Handle<v8::Function> removeBreakpointFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "removeBreakpoint")));
+    v8::Debug::Call(removeBreakpointFunction, info);
+}
+
+void ScriptDebugServer::clearBreakpoints()
+{
+    ensureDebuggerScriptCompiled();
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
+    v8::Context::Scope contextScope(debuggerContext);
+
+    v8::Handle<v8::Function> clearBreakpoints = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "clearBreakpoints")));
+    v8::Debug::Call(clearBreakpoints);
+}
+
+void ScriptDebugServer::setBreakpointsActivated(bool activated)
+{
+    ensureDebuggerScriptCompiled();
+    v8::HandleScope scope(m_isolate);
+    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
+    v8::Context::Scope contextScope(debuggerContext);
+
+    v8::Local<v8::Object> info = v8::Object::New(m_isolate);
+    info->Set(v8AtomicString(m_isolate, "enabled"), v8::Boolean::New(m_isolate, activated));
+    v8::Handle<v8::Function> setBreakpointsActivated = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "setBreakpointsActivated")));
+    v8::Debug::Call(setBreakpointsActivated, info);
+
+    m_breakpointsActivated = activated;
+}
+
+ScriptDebugServer::PauseOnExceptionsState ScriptDebugServer::pauseOnExceptionsState()
+{
+    ensureDebuggerScriptCompiled();
+    v8::HandleScope scope(m_isolate);
+    v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
+
+    v8::Handle<v8::Value> argv[] = { v8Undefined() };
+    v8::Handle<v8::Value> result = callDebuggerMethod("pauseOnExceptionsState", 0, argv);
+    return static_cast<ScriptDebugServer::PauseOnExceptionsState>(result->Int32Value());
+}
+
+void ScriptDebugServer::setPauseOnExceptionsState(PauseOnExceptionsState pauseOnExceptionsState)
+{
+    ensureDebuggerScriptCompiled();
+    v8::HandleScope scope(m_isolate);
+    v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
+
+    v8::Handle<v8::Value> argv[] = { v8::Int32::New(m_isolate, pauseOnExceptionsState) };
+    callDebuggerMethod("setPauseOnExceptionsState", 1, argv);
+}
+
+void ScriptDebugServer::setPauseOnNextStatement(bool pause)
+{
+    ASSERT(!isPaused());
+    if (pause)
+        v8::Debug::DebugBreak(m_isolate);
+    else
+        v8::Debug::CancelDebugBreak(m_isolate);
+}
+
+bool ScriptDebugServer::pausingOnNextStatement()
+{
+    return v8::Debug::CheckDebugBreak(m_isolate);
+}
+
+bool ScriptDebugServer::canBreakProgram()
+{
+    if (!m_breakpointsActivated)
+        return false;
+    return m_isolate->InContext();
+}
+
+void ScriptDebugServer::breakProgram()
+{
+    if (!canBreakProgram())
+        return;
+
+    v8::HandleScope scope(m_isolate);
+    if (m_breakProgramCallbackTemplate.isEmpty()) {
+        v8::Handle<v8::FunctionTemplate> templ = v8::FunctionTemplate::New(m_isolate);
+        templ->SetCallHandler(&ScriptDebugServer::breakProgramCallback, v8::External::New(m_isolate, this));
+        m_breakProgramCallbackTemplate.set(m_isolate, templ);
+    }
+
+    v8::Handle<v8::Function> breakProgramFunction = m_breakProgramCallbackTemplate.newLocal(m_isolate)->GetFunction();
+    v8::Debug::Call(breakProgramFunction);
+}
+
+void ScriptDebugServer::continueProgram()
+{
+    if (isPaused())
+        quitMessageLoopOnPause();
+    m_pausedScriptState.clear();
+    m_executionState.Clear();
+}
+
+void ScriptDebugServer::stepIntoStatement()
+{
+    ASSERT(isPaused());
+    ASSERT(!m_executionState.IsEmpty());
+    v8::HandleScope handleScope(m_isolate);
+    v8::Handle<v8::Value> argv[] = { m_executionState };
+    callDebuggerMethod(stepIntoV8MethodName, 1, argv);
+    continueProgram();
+}
+
+void ScriptDebugServer::stepOverStatement()
+{
+    ASSERT(isPaused());
+    ASSERT(!m_executionState.IsEmpty());
+    v8::HandleScope handleScope(m_isolate);
+    v8::Handle<v8::Value> argv[] = { m_executionState };
+    callDebuggerMethod("stepOverStatement", 1, argv);
+    continueProgram();
+}
+
+void ScriptDebugServer::stepOutOfFunction()
+{
+    ASSERT(isPaused());
+    ASSERT(!m_executionState.IsEmpty());
+    v8::HandleScope handleScope(m_isolate);
+    v8::Handle<v8::Value> argv[] = { m_executionState };
+    callDebuggerMethod(stepOutV8MethodName, 1, argv);
+    continueProgram();
+}
+
+bool ScriptDebugServer::setScriptSource(const String& sourceID, const String& newContent, bool preview, String* error, RefPtr<TypeBuilder::Debugger::SetScriptSourceError>& errorData, ScriptValue* newCallFrames, RefPtr<JSONObject>* result)
+{
+    class EnableLiveEditScope {
+    public:
+        explicit EnableLiveEditScope(v8::Isolate* isolate) : m_isolate(isolate) { v8::Debug::SetLiveEditEnabled(m_isolate, true); }
+        ~EnableLiveEditScope() { v8::Debug::SetLiveEditEnabled(m_isolate, false); }
+    private:
+        v8::Isolate* m_isolate;
+    };
+
+    ensureDebuggerScriptCompiled();
+    v8::HandleScope scope(m_isolate);
+
+    OwnPtr<v8::Context::Scope> contextScope;
+    v8::Handle<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
+    if (!isPaused())
+        contextScope = adoptPtr(new v8::Context::Scope(debuggerContext));
+
+    v8::Handle<v8::Value> argv[] = { v8String(m_isolate, sourceID), v8String(m_isolate, newContent), v8Boolean(preview, m_isolate) };
+
+    v8::Local<v8::Value> v8result;
+    {
+        EnableLiveEditScope enableLiveEditScope(m_isolate);
+        v8::TryCatch tryCatch;
+        tryCatch.SetVerbose(false);
+        v8result = callDebuggerMethod("liveEditScriptSource", 3, argv);
+        if (tryCatch.HasCaught()) {
+            v8::Local<v8::Message> message = tryCatch.Message();
+            if (!message.IsEmpty())
+                *error = toCoreStringWithUndefinedOrNullCheck(message->Get());
+            else
+                *error = "Unknown error.";
+            return false;
+        }
+    }
+    ASSERT(!v8result.IsEmpty());
+    v8::Local<v8::Object> resultTuple = v8result->ToObject();
+    int code = static_cast<int>(resultTuple->Get(0)->ToInteger()->Value());
+    switch (code) {
+    case 0:
+        {
+            v8::Local<v8::Value> normalResult = resultTuple->Get(1);
+            RefPtr<JSONValue> jsonResult = v8ToJSONValue(m_isolate, normalResult, JSONValue::maxDepth);
+            if (jsonResult)
+                *result = jsonResult->asObject();
+            // Call stack may have changed after if the edited function was on the stack.
+            if (!preview && isPaused())
+                *newCallFrames = currentCallFrames();
+            return true;
+        }
+    // Compile error.
+    case 1:
+        {
+            RefPtr<TypeBuilder::Debugger::SetScriptSourceError::CompileError> compileError =
+                TypeBuilder::Debugger::SetScriptSourceError::CompileError::create()
+                    .setMessage(toCoreStringWithUndefinedOrNullCheck(resultTuple->Get(2)))
+                    .setLineNumber(resultTuple->Get(3)->ToInteger()->Value())
+                    .setColumnNumber(resultTuple->Get(4)->ToInteger()->Value());
+
+            *error = toCoreStringWithUndefinedOrNullCheck(resultTuple->Get(1));
+            errorData = TypeBuilder::Debugger::SetScriptSourceError::create();
+            errorData->setCompileError(compileError);
+            return false;
+        }
+    }
+    *error = "Unknown error.";
+    return false;
+}
+
+int ScriptDebugServer::frameCount()
+{
+    ASSERT(isPaused());
+    ASSERT(!m_executionState.IsEmpty());
+    v8::Handle<v8::Value> argv[] = { m_executionState };
+    v8::Handle<v8::Value> result = callDebuggerMethod("frameCount", WTF_ARRAY_LENGTH(argv), argv);
+    if (result->IsInt32())
+        return result->Int32Value();
+    return 0;
+}
+
+PassRefPtr<JavaScriptCallFrame> ScriptDebugServer::toJavaScriptCallFrameUnsafe(const ScriptValue& value)
+{
+    if (value.isEmpty())
+        return nullptr;
+    ASSERT(value.isObject());
+    return V8JavaScriptCallFrame::toNative(v8::Handle<v8::Object>::Cast(value.v8ValueUnsafe()));
+}
+
+PassRefPtr<JavaScriptCallFrame> ScriptDebugServer::wrapCallFrames(int maximumLimit, ScopeInfoDetails scopeDetails)
+{
+    const int scopeBits = 2;
+    COMPILE_ASSERT(NoScopes < (1 << scopeBits), not_enough_bits_to_encode_ScopeInfoDetails);
+
+    ASSERT(maximumLimit >= 0);
+    int data = (maximumLimit << scopeBits) | scopeDetails;
+    v8::Handle<v8::Value> currentCallFrameV8;
+    if (m_executionState.IsEmpty()) {
+        v8::Handle<v8::Function> currentCallFrameFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "currentCallFrame")));
+        currentCallFrameV8 = v8::Debug::Call(currentCallFrameFunction, v8::Integer::New(m_isolate, data));
+    } else {
+        v8::Handle<v8::Value> argv[] = { m_executionState, v8::Integer::New(m_isolate, data) };
+        currentCallFrameV8 = callDebuggerMethod("currentCallFrame", WTF_ARRAY_LENGTH(argv), argv);
+    }
+    ASSERT(!currentCallFrameV8.IsEmpty());
+    if (!currentCallFrameV8->IsObject())
+        return nullptr;
+    return JavaScriptCallFrame::create(v8::Debug::GetDebugContext(), v8::Handle<v8::Object>::Cast(currentCallFrameV8));
+}
+
+ScriptValue ScriptDebugServer::currentCallFramesInner(ScopeInfoDetails scopeDetails)
+{
+    if (!m_isolate->InContext())
+        return ScriptValue();
+    v8::HandleScope handleScope(m_isolate);
+
+    // Filter out stack traces entirely consisting of V8's internal scripts.
+    v8::Local<v8::StackTrace> stackTrace = v8::StackTrace::CurrentStackTrace(m_isolate, 1);
+    if (!stackTrace->GetFrameCount())
+        return ScriptValue();
+
+    RefPtr<JavaScriptCallFrame> currentCallFrame = wrapCallFrames(0, scopeDetails);
+    if (!currentCallFrame)
+        return ScriptValue();
+
+    ScriptState* scriptState = m_pausedScriptState ? m_pausedScriptState.get() : ScriptState::current(m_isolate);
+    ScriptState::Scope scope(scriptState);
+    return ScriptValue(scriptState, toV8(currentCallFrame.release(), scriptState->context()->Global(), m_isolate));
+}
+
+ScriptValue ScriptDebugServer::currentCallFrames()
+{
+    return currentCallFramesInner(AllScopes);
+}
+
+ScriptValue ScriptDebugServer::currentCallFramesForAsyncStack()
+{
+    return currentCallFramesInner(FastAsyncScopes);
+}
+
+PassRefPtr<JavaScriptCallFrame> ScriptDebugServer::callFrameNoScopes(int index)
+{
+    v8::Handle<v8::Value> currentCallFrameV8;
+    if (m_executionState.IsEmpty()) {
+        v8::Handle<v8::Function> currentCallFrameFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "currentCallFrameByIndex")));
+        currentCallFrameV8 = v8::Debug::Call(currentCallFrameFunction, v8::Integer::New(m_isolate, index));
+    } else {
+        v8::Handle<v8::Value> argv[] = { m_executionState, v8::Integer::New(m_isolate, index) };
+        currentCallFrameV8 = callDebuggerMethod("currentCallFrameByIndex", WTF_ARRAY_LENGTH(argv), argv);
+    }
+    ASSERT(!currentCallFrameV8.IsEmpty());
+    if (!currentCallFrameV8->IsObject())
+        return nullptr;
+    return JavaScriptCallFrame::create(v8::Debug::GetDebugContext(), v8::Handle<v8::Object>::Cast(currentCallFrameV8));
+}
+
+void ScriptDebugServer::interruptAndRun(PassOwnPtr<Task> task, v8::Isolate* isolate)
+{
+    v8::Debug::DebugBreakForCommand(isolate, new ClientDataImpl(task));
+}
+
+void ScriptDebugServer::runPendingTasks()
+{
+    v8::Debug::ProcessDebugMessages();
+}
+
+static ScriptDebugServer* toScriptDebugServer(v8::Handle<v8::Value> data)
+{
+    void* p = v8::Handle<v8::External>::Cast(data)->Value();
+    return static_cast<ScriptDebugServer*>(p);
+}
+
+void ScriptDebugServer::breakProgramCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    ASSERT(2 == info.Length());
+    ScriptDebugServer* thisPtr = toScriptDebugServer(info.Data());
+    ScriptState* pausedScriptState = ScriptState::current(thisPtr->m_isolate);
+    v8::Handle<v8::Value> exception;
+    v8::Handle<v8::Array> hitBreakpoints;
+    thisPtr->handleProgramBreak(pausedScriptState, v8::Handle<v8::Object>::Cast(info[0]), exception, hitBreakpoints);
+}
+
+void ScriptDebugServer::handleProgramBreak(ScriptState* pausedScriptState, v8::Handle<v8::Object> executionState, v8::Handle<v8::Value> exception, v8::Handle<v8::Array> hitBreakpointNumbers)
+{
+    // Don't allow nested breaks.
+    if (isPaused())
+        return;
+
+    ScriptDebugListener* listener = getDebugListenerForContext(pausedScriptState->context());
+    if (!listener)
+        return;
+
+    Vector<String> breakpointIds;
+    if (!hitBreakpointNumbers.IsEmpty()) {
+        breakpointIds.resize(hitBreakpointNumbers->Length());
+        for (size_t i = 0; i < hitBreakpointNumbers->Length(); i++) {
+            v8::Handle<v8::Value> hitBreakpointNumber = hitBreakpointNumbers->Get(i);
+            ASSERT(!hitBreakpointNumber.IsEmpty() && hitBreakpointNumber->IsInt32());
+            breakpointIds[i] = String::number(hitBreakpointNumber->Int32Value());
+        }
+    }
+
+    m_pausedScriptState = pausedScriptState;
+    m_executionState = executionState;
+    ScriptDebugListener::SkipPauseRequest result = listener->didPause(pausedScriptState, currentCallFrames(), ScriptValue(pausedScriptState, exception), breakpointIds);
+    if (result == ScriptDebugListener::NoSkip) {
+        m_runningNestedMessageLoop = true;
+        runMessageLoopOnPause(pausedScriptState->context());
+        m_runningNestedMessageLoop = false;
+    }
+    m_pausedScriptState.clear();
+    m_executionState.Clear();
+
+    if (result == ScriptDebugListener::StepInto) {
+        v8::Handle<v8::Value> argv[] = { executionState };
+        callDebuggerMethod(stepIntoV8MethodName, 1, argv);
+    } else if (result == ScriptDebugListener::StepOut) {
+        v8::Handle<v8::Value> argv[] = { executionState };
+        callDebuggerMethod(stepOutV8MethodName, 1, argv);
+    }
+}
+
+void ScriptDebugServer::v8DebugEventCallback(const v8::Debug::EventDetails& eventDetails)
+{
+    ScriptDebugServer* thisPtr = toScriptDebugServer(eventDetails.GetCallbackData());
+    thisPtr->handleV8DebugEvent(eventDetails);
+}
+
+static v8::Handle<v8::Value> callInternalGetterFunction(v8::Handle<v8::Object> object, const char* functionName, v8::Isolate* isolate)
+{
+    v8::Handle<v8::Value> getterValue = object->Get(v8AtomicString(isolate, functionName));
+    ASSERT(!getterValue.IsEmpty() && getterValue->IsFunction());
+    return V8ScriptRunner::callInternalFunction(v8::Handle<v8::Function>::Cast(getterValue), object, 0, 0, isolate);
+}
+
+void ScriptDebugServer::handleV8DebugEvent(const v8::Debug::EventDetails& eventDetails)
+{
+    v8::DebugEvent event = eventDetails.GetEvent();
+
+    if (event == v8::BreakForCommand) {
+        ClientDataImpl* data = static_cast<ClientDataImpl*>(eventDetails.GetClientData());
+        data->task()->run();
+        return;
+    }
+
+    if (event != v8::AsyncTaskEvent && event != v8::Break && event != v8::Exception && event != v8::AfterCompile && event != v8::BeforeCompile && event != v8::CompileError && event != v8::PromiseEvent)
+        return;
+
+    v8::Handle<v8::Context> eventContext = eventDetails.GetEventContext();
+    ASSERT(!eventContext.IsEmpty());
+
+    ScriptDebugListener* listener = getDebugListenerForContext(eventContext);
+    if (listener) {
+        v8::HandleScope scope(m_isolate);
+        v8::Handle<v8::Object> debuggerScript = m_debuggerScript.newLocal(m_isolate);
+        if (event == v8::BeforeCompile) {
+            preprocessBeforeCompile(eventDetails);
+        } else if (event == v8::AfterCompile || event == v8::CompileError) {
+            v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
+            v8::Handle<v8::Function> getAfterCompileScript = v8::Local<v8::Function>::Cast(debuggerScript->Get(v8AtomicString(m_isolate, "getAfterCompileScript")));
+            v8::Handle<v8::Value> argv[] = { eventDetails.GetEventData() };
+            v8::Handle<v8::Value> value = V8ScriptRunner::callInternalFunction(getAfterCompileScript, debuggerScript, WTF_ARRAY_LENGTH(argv), argv, m_isolate);
+            ASSERT(value->IsObject());
+            v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(value);
+            dispatchDidParseSource(listener, object, event != v8::AfterCompile ? CompileError : CompileSuccess);
+        } else if (event == v8::Exception) {
+            v8::Handle<v8::Object> eventData = eventDetails.GetEventData();
+            v8::Handle<v8::Value> exception = callInternalGetterFunction(eventData, "exception", m_isolate);
+            handleProgramBreak(ScriptState::from(eventContext), eventDetails.GetExecutionState(), exception, v8::Handle<v8::Array>());
+        } else if (event == v8::Break) {
+            v8::Handle<v8::Function> getBreakpointNumbersFunction = v8::Local<v8::Function>::Cast(debuggerScript->Get(v8AtomicString(m_isolate, "getBreakpointNumbers")));
+            v8::Handle<v8::Value> argv[] = { eventDetails.GetEventData() };
+            v8::Handle<v8::Value> hitBreakpoints = V8ScriptRunner::callInternalFunction(getBreakpointNumbersFunction, debuggerScript, WTF_ARRAY_LENGTH(argv), argv, m_isolate);
+            ASSERT(hitBreakpoints->IsArray());
+            handleProgramBreak(ScriptState::from(eventContext), eventDetails.GetExecutionState(), v8::Handle<v8::Value>(), hitBreakpoints.As<v8::Array>());
+        } else if (event == v8::AsyncTaskEvent) {
+            handleV8AsyncTaskEvent(listener, ScriptState::from(eventContext), eventDetails.GetExecutionState(), eventDetails.GetEventData());
+        } else if (event == v8::PromiseEvent) {
+            handleV8PromiseEvent(listener, ScriptState::from(eventContext), eventDetails.GetExecutionState(), eventDetails.GetEventData());
+        }
+    }
+}
+
+void ScriptDebugServer::handleV8AsyncTaskEvent(ScriptDebugListener* listener, ScriptState* pausedScriptState, v8::Handle<v8::Object> executionState, v8::Handle<v8::Object> eventData)
+{
+    String type = toCoreStringWithUndefinedOrNullCheck(callInternalGetterFunction(eventData, "type", m_isolate));
+    String name = toCoreStringWithUndefinedOrNullCheck(callInternalGetterFunction(eventData, "name", m_isolate));
+    int id = callInternalGetterFunction(eventData, "id", m_isolate)->ToInteger()->Value();
+
+    m_pausedScriptState = pausedScriptState;
+    m_executionState = executionState;
+    listener->didReceiveV8AsyncTaskEvent(pausedScriptState->executionContext(), type, name, id);
+    m_pausedScriptState.clear();
+    m_executionState.Clear();
+}
+
+void ScriptDebugServer::handleV8PromiseEvent(ScriptDebugListener* listener, ScriptState* pausedScriptState, v8::Handle<v8::Object> executionState, v8::Handle<v8::Object> eventData)
+{
+    v8::Handle<v8::Value> argv[] = { eventData };
+    v8::Local<v8::Object> promiseDetails = callDebuggerMethod("getPromiseDetails", 1, argv)->ToObject();
+    v8::Handle<v8::Object> promise = promiseDetails->Get(v8AtomicString(m_isolate, "promise"))->ToObject();
+    int status = promiseDetails->Get(v8AtomicString(m_isolate, "status"))->ToInteger()->Value();
+    v8::Handle<v8::Value> parentPromise = promiseDetails->Get(v8AtomicString(m_isolate, "parentPromise"));
+
+    m_pausedScriptState = pausedScriptState;
+    m_executionState = executionState;
+    listener->didReceiveV8PromiseEvent(pausedScriptState, promise, parentPromise, status);
+    m_pausedScriptState.clear();
+    m_executionState.Clear();
+}
+
+void ScriptDebugServer::dispatchDidParseSource(ScriptDebugListener* listener, v8::Handle<v8::Object> object, CompileResult compileResult)
+{
+    v8::Handle<v8::Value> id = object->Get(v8AtomicString(m_isolate, "id"));
+    ASSERT(!id.IsEmpty() && id->IsInt32());
+    String sourceID = String::number(id->Int32Value());
+
+    ScriptDebugListener::Script script;
+    script.url = toCoreStringWithUndefinedOrNullCheck(object->Get(v8AtomicString(m_isolate, "name")));
+    script.sourceURL = toCoreStringWithUndefinedOrNullCheck(object->Get(v8AtomicString(m_isolate, "sourceURL")));
+    script.sourceMappingURL = toCoreStringWithUndefinedOrNullCheck(object->Get(v8AtomicString(m_isolate, "sourceMappingURL")));
+    script.source = toCoreStringWithUndefinedOrNullCheck(object->Get(v8AtomicString(m_isolate, "source")));
+    script.startLine = object->Get(v8AtomicString(m_isolate, "startLine"))->ToInteger()->Value();
+    script.startColumn = object->Get(v8AtomicString(m_isolate, "startColumn"))->ToInteger()->Value();
+    script.endLine = object->Get(v8AtomicString(m_isolate, "endLine"))->ToInteger()->Value();
+    script.endColumn = object->Get(v8AtomicString(m_isolate, "endColumn"))->ToInteger()->Value();
+    script.isContentScript = object->Get(v8AtomicString(m_isolate, "isContentScript"))->ToBoolean()->Value();
+
+    listener->didParseSource(sourceID, script, compileResult);
+}
+
+void ScriptDebugServer::ensureDebuggerScriptCompiled()
+{
+    if (!m_debuggerScript.isEmpty())
+        return;
+
+    v8::HandleScope scope(m_isolate);
+    v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
+    const blink::WebData& debuggerScriptSourceResource = blink::Platform::current()->loadResource("DebuggerScriptSource.js");
+    v8::Handle<v8::String> source = v8String(m_isolate, String(debuggerScriptSourceResource.data(), debuggerScriptSourceResource.size()));
+    v8::Local<v8::Value> value = V8ScriptRunner::compileAndRunInternalScript(source, m_isolate);
+    ASSERT(!value.IsEmpty());
+    ASSERT(value->IsObject());
+    m_debuggerScript.set(m_isolate, v8::Handle<v8::Object>::Cast(value));
+}
+
+void ScriptDebugServer::discardDebuggerScript()
+{
+    ASSERT(!m_debuggerScript.isEmpty());
+    m_debuggerScript.clear();
+}
+
+v8::Local<v8::Value> ScriptDebugServer::functionScopes(v8::Handle<v8::Function> function)
+{
+    ensureDebuggerScriptCompiled();
+
+    v8::Handle<v8::Value> argv[] = { function };
+    return callDebuggerMethod("getFunctionScopes", 1, argv);
+}
+
+v8::Local<v8::Value> ScriptDebugServer::collectionEntries(v8::Handle<v8::Object>& object)
+{
+    ensureDebuggerScriptCompiled();
+
+    v8::Handle<v8::Value> argv[] = { object };
+    return callDebuggerMethod("getCollectionEntries", 1, argv);
+}
+
+v8::Local<v8::Value> ScriptDebugServer::getInternalProperties(v8::Handle<v8::Object>& object)
+{
+    if (m_debuggerScript.isEmpty())
+        return v8::Local<v8::Value>::New(m_isolate, v8::Undefined(m_isolate));
+
+    v8::Handle<v8::Value> argv[] = { object };
+    return callDebuggerMethod("getInternalProperties", 1, argv);
+}
+
+v8::Handle<v8::Value> ScriptDebugServer::setFunctionVariableValue(v8::Handle<v8::Value> functionValue, int scopeNumber, const String& variableName, v8::Handle<v8::Value> newValue)
+{
+    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
+    if (m_debuggerScript.isEmpty())
+        return m_isolate->ThrowException(v8::String::NewFromUtf8(m_isolate, "Debugging is not enabled."));
+
+    v8::Handle<v8::Value> argv[] = {
+        functionValue,
+        v8::Handle<v8::Value>(v8::Integer::New(debuggerContext->GetIsolate(), scopeNumber)),
+        v8String(debuggerContext->GetIsolate(), variableName),
+        newValue
+    };
+    return callDebuggerMethod("setFunctionVariableValue", 4, argv);
+}
+
+bool ScriptDebugServer::isPaused()
+{
+    return m_pausedScriptState;
+}
+
+void ScriptDebugServer::compileScript(ScriptState* scriptState, const String& expression, const String& sourceURL, String* scriptId, String* exceptionDetailsText, int* lineNumber, int* columnNumber, RefPtr<ScriptCallStack>* stackTrace)
+{
+    if (scriptState->contextIsEmpty())
+        return;
+    ScriptState::Scope scope(scriptState);
+
+    v8::Handle<v8::String> source = v8String(m_isolate, expression);
+    v8::TryCatch tryCatch;
+    v8::Local<v8::Script> script = V8ScriptRunner::compileScript(source, sourceURL, TextPosition(), m_isolate);
+    if (tryCatch.HasCaught()) {
+        v8::Local<v8::Message> message = tryCatch.Message();
+        if (!message.IsEmpty()) {
+            *exceptionDetailsText = toCoreStringWithUndefinedOrNullCheck(message->Get());
+            *lineNumber = message->GetLineNumber();
+            *columnNumber = message->GetStartColumn();
+            *stackTrace = createScriptCallStack(message->GetStackTrace(), message->GetStackTrace()->GetFrameCount(), m_isolate);
+        }
+        return;
+    }
+    if (script.IsEmpty())
+        return;
+
+    *scriptId = String::number(script->GetUnboundScript()->GetId());
+    m_compiledScripts.set(*scriptId, adoptPtr(new ScopedPersistent<v8::Script>(m_isolate, script)));
+}
+
+void ScriptDebugServer::clearCompiledScripts()
+{
+    m_compiledScripts.clear();
+}
+
+void ScriptDebugServer::runScript(ScriptState* scriptState, const String& scriptId, ScriptValue* result, bool* wasThrown, String* exceptionDetailsText, int* lineNumber, int* columnNumber, RefPtr<ScriptCallStack>* stackTrace)
+{
+    if (!m_compiledScripts.contains(scriptId))
+        return;
+    v8::HandleScope handleScope(m_isolate);
+    ScopedPersistent<v8::Script>* scriptHandle = m_compiledScripts.get(scriptId);
+    v8::Local<v8::Script> script = scriptHandle->newLocal(m_isolate);
+    m_compiledScripts.remove(scriptId);
+    if (script.IsEmpty())
+        return;
+
+    if (scriptState->contextIsEmpty())
+        return;
+    ScriptState::Scope scope(scriptState);
+    v8::TryCatch tryCatch;
+    v8::Local<v8::Value> value = V8ScriptRunner::runCompiledScript(script, scriptState->executionContext(), m_isolate);
+    *wasThrown = false;
+    if (tryCatch.HasCaught()) {
+        *wasThrown = true;
+        *result = ScriptValue(scriptState, tryCatch.Exception());
+        v8::Local<v8::Message> message = tryCatch.Message();
+        if (!message.IsEmpty()) {
+            *exceptionDetailsText = toCoreStringWithUndefinedOrNullCheck(message->Get());
+            *lineNumber = message->GetLineNumber();
+            *columnNumber = message->GetStartColumn();
+            *stackTrace = createScriptCallStack(message->GetStackTrace(), message->GetStackTrace()->GetFrameCount(), m_isolate);
+        }
+    } else {
+        *result = ScriptValue(scriptState, value);
+    }
+}
+
+PassOwnPtr<ScriptSourceCode> ScriptDebugServer::preprocess(LocalFrame*, const ScriptSourceCode&)
+{
+    return PassOwnPtr<ScriptSourceCode>();
+}
+
+String ScriptDebugServer::preprocessEventListener(LocalFrame*, const String& source, const String& url, const String& functionName)
+{
+    return source;
+}
+
+} // namespace blink