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      1 /*
      2  * Copyright (c) 2010-2011 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "bindings/v8/ScriptDebugServer.h"
     33 
     34 #include "DebuggerScriptSource.h"
     35 #include "V8JavaScriptCallFrame.h"
     36 #include "bindings/v8/ScopedPersistent.h"
     37 #include "bindings/v8/ScriptController.h"
     38 #include "bindings/v8/ScriptObject.h"
     39 #include "bindings/v8/ScriptSourceCode.h"
     40 #include "bindings/v8/V8Binding.h"
     41 #include "bindings/v8/V8ScriptRunner.h"
     42 #include "core/inspector/JavaScriptCallFrame.h"
     43 #include "core/inspector/ScriptDebugListener.h"
     44 #include "wtf/StdLibExtras.h"
     45 #include "wtf/Vector.h"
     46 #include "wtf/dtoa/utils.h"
     47 #include "wtf/text/CString.h"
     48 
     49 namespace WebCore {
     50 
     51 namespace {
     52 
     53 class ClientDataImpl : public v8::Debug::ClientData {
     54 public:
     55     ClientDataImpl(PassOwnPtr<ScriptDebugServer::Task> task) : m_task(task) { }
     56     virtual ~ClientDataImpl() { }
     57     ScriptDebugServer::Task* task() const { return m_task.get(); }
     58 private:
     59     OwnPtr<ScriptDebugServer::Task> m_task;
     60 };
     61 
     62 const char stepIntoV8MethodName[] = "stepIntoStatement";
     63 const char stepOutV8MethodName[] = "stepOutOfFunction";
     64 }
     65 
     66 v8::Local<v8::Value> ScriptDebugServer::callDebuggerMethod(const char* functionName, int argc, v8::Handle<v8::Value> argv[])
     67 {
     68     v8::Handle<v8::Object> debuggerScript = m_debuggerScript.newLocal(m_isolate);
     69     v8::Handle<v8::Function> function = v8::Local<v8::Function>::Cast(debuggerScript->Get(v8AtomicString(m_isolate, functionName)));
     70     ASSERT(m_isolate->InContext());
     71     return V8ScriptRunner::callInternalFunction(function, debuggerScript, argc, argv, m_isolate);
     72 }
     73 
     74 ScriptDebugServer::ScriptDebugServer(v8::Isolate* isolate)
     75     : m_pauseOnExceptionsState(DontPauseOnExceptions)
     76     , m_breakpointsActivated(true)
     77     , m_isolate(isolate)
     78     , m_runningNestedMessageLoop(false)
     79 {
     80 }
     81 
     82 ScriptDebugServer::~ScriptDebugServer()
     83 {
     84 }
     85 
     86 String ScriptDebugServer::setBreakpoint(const String& sourceID, const ScriptBreakpoint& scriptBreakpoint, int* actualLineNumber, int* actualColumnNumber, bool interstatementLocation)
     87 {
     88     v8::HandleScope scope(m_isolate);
     89     v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
     90     v8::Context::Scope contextScope(debuggerContext);
     91 
     92     v8::Local<v8::Object> info = v8::Object::New();
     93     info->Set(v8AtomicString(m_isolate, "sourceID"), v8String(debuggerContext->GetIsolate(), sourceID));
     94     info->Set(v8AtomicString(m_isolate, "lineNumber"), v8::Integer::New(scriptBreakpoint.lineNumber, debuggerContext->GetIsolate()));
     95     info->Set(v8AtomicString(m_isolate, "columnNumber"), v8::Integer::New(scriptBreakpoint.columnNumber, debuggerContext->GetIsolate()));
     96     info->Set(v8AtomicString(m_isolate, "interstatementLocation"), v8Boolean(interstatementLocation, debuggerContext->GetIsolate()));
     97     info->Set(v8AtomicString(m_isolate, "condition"), v8String(debuggerContext->GetIsolate(), scriptBreakpoint.condition));
     98 
     99     v8::Handle<v8::Function> setBreakpointFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "setBreakpoint")));
    100     v8::Handle<v8::Value> breakpointId = v8::Debug::Call(setBreakpointFunction, info);
    101     if (!breakpointId->IsString())
    102         return "";
    103     *actualLineNumber = info->Get(v8AtomicString(m_isolate, "lineNumber"))->Int32Value();
    104     *actualColumnNumber = info->Get(v8AtomicString(m_isolate, "columnNumber"))->Int32Value();
    105     return toCoreString(breakpointId.As<v8::String>());
    106 }
    107 
    108 void ScriptDebugServer::removeBreakpoint(const String& breakpointId)
    109 {
    110     v8::HandleScope scope(m_isolate);
    111     v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
    112     v8::Context::Scope contextScope(debuggerContext);
    113 
    114     v8::Local<v8::Object> info = v8::Object::New();
    115     info->Set(v8AtomicString(m_isolate, "breakpointId"), v8String(debuggerContext->GetIsolate(), breakpointId));
    116 
    117     v8::Handle<v8::Function> removeBreakpointFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "removeBreakpoint")));
    118     v8::Debug::Call(removeBreakpointFunction, info);
    119 }
    120 
    121 void ScriptDebugServer::clearBreakpoints()
    122 {
    123     ensureDebuggerScriptCompiled();
    124     v8::HandleScope scope(m_isolate);
    125     v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
    126     v8::Context::Scope contextScope(debuggerContext);
    127 
    128     v8::Handle<v8::Function> clearBreakpoints = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "clearBreakpoints")));
    129     v8::Debug::Call(clearBreakpoints);
    130 }
    131 
    132 void ScriptDebugServer::setBreakpointsActivated(bool activated)
    133 {
    134     ensureDebuggerScriptCompiled();
    135     v8::HandleScope scope(m_isolate);
    136     v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
    137     v8::Context::Scope contextScope(debuggerContext);
    138 
    139     v8::Local<v8::Object> info = v8::Object::New();
    140     info->Set(v8AtomicString(m_isolate, "enabled"), v8::Boolean::New(m_isolate, activated));
    141     v8::Handle<v8::Function> setBreakpointsActivated = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "setBreakpointsActivated")));
    142     v8::Debug::Call(setBreakpointsActivated, info);
    143 
    144     m_breakpointsActivated = activated;
    145 }
    146 
    147 ScriptDebugServer::PauseOnExceptionsState ScriptDebugServer::pauseOnExceptionsState()
    148 {
    149     ensureDebuggerScriptCompiled();
    150     v8::HandleScope scope(m_isolate);
    151     v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
    152 
    153     v8::Handle<v8::Value> argv[] = { v8Undefined() };
    154     v8::Handle<v8::Value> result = callDebuggerMethod("pauseOnExceptionsState", 0, argv);
    155     return static_cast<ScriptDebugServer::PauseOnExceptionsState>(result->Int32Value());
    156 }
    157 
    158 void ScriptDebugServer::setPauseOnExceptionsState(PauseOnExceptionsState pauseOnExceptionsState)
    159 {
    160     ensureDebuggerScriptCompiled();
    161     v8::HandleScope scope(m_isolate);
    162     v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
    163 
    164     v8::Handle<v8::Value> argv[] = { v8::Int32::New(pauseOnExceptionsState, m_isolate) };
    165     callDebuggerMethod("setPauseOnExceptionsState", 1, argv);
    166 }
    167 
    168 void ScriptDebugServer::setPauseOnNextStatement(bool pause)
    169 {
    170     if (isPaused())
    171         return;
    172     if (pause)
    173         v8::Debug::DebugBreak(m_isolate);
    174     else
    175         v8::Debug::CancelDebugBreak(m_isolate);
    176 }
    177 
    178 bool ScriptDebugServer::canBreakProgram()
    179 {
    180     if (!m_breakpointsActivated)
    181         return false;
    182     v8::HandleScope scope(m_isolate);
    183     return !m_isolate->GetCurrentContext().IsEmpty();
    184 }
    185 
    186 void ScriptDebugServer::breakProgram()
    187 {
    188     if (!canBreakProgram())
    189         return;
    190 
    191     v8::HandleScope scope(m_isolate);
    192     if (m_breakProgramCallbackTemplate.isEmpty()) {
    193         v8::Handle<v8::FunctionTemplate> templ = v8::FunctionTemplate::New(m_isolate);
    194         templ->SetCallHandler(&ScriptDebugServer::breakProgramCallback, v8::External::New(m_isolate, this));
    195         m_breakProgramCallbackTemplate.set(m_isolate, templ);
    196     }
    197 
    198     m_pausedContext = m_isolate->GetCurrentContext();
    199     v8::Handle<v8::Function> breakProgramFunction = m_breakProgramCallbackTemplate.newLocal(m_isolate)->GetFunction();
    200     v8::Debug::Call(breakProgramFunction);
    201     m_pausedContext.Clear();
    202 }
    203 
    204 void ScriptDebugServer::continueProgram()
    205 {
    206     if (isPaused())
    207         quitMessageLoopOnPause();
    208     m_executionState.clear();
    209 }
    210 
    211 void ScriptDebugServer::stepIntoStatement()
    212 {
    213     ASSERT(isPaused());
    214     v8::HandleScope handleScope(m_isolate);
    215     v8::Handle<v8::Value> argv[] = { m_executionState.newLocal(m_isolate) };
    216     callDebuggerMethod(stepIntoV8MethodName, 1, argv);
    217     continueProgram();
    218 }
    219 
    220 void ScriptDebugServer::stepCommandWithFrame(const char* functionName, const ScriptValue& frame)
    221 {
    222     ASSERT(isPaused());
    223     v8::HandleScope handleScope(m_isolate);
    224     v8::Handle<v8::Value> callFrame;
    225     if (frame.hasNoValue()) {
    226         callFrame = v8::Undefined(m_isolate);
    227     } else {
    228         JavaScriptCallFrame* impl = V8JavaScriptCallFrame::toNative(v8::Handle<v8::Object>::Cast(frame.v8Value()));
    229         callFrame = impl->innerCallFrame();
    230     }
    231 
    232     v8::Handle<v8::Value> argv[] = {
    233         m_executionState.newLocal(m_isolate),
    234         callFrame
    235     };
    236 
    237     callDebuggerMethod(functionName, 2, argv);
    238     continueProgram();
    239 }
    240 
    241 void ScriptDebugServer::stepOverStatement(const ScriptValue& frame)
    242 {
    243     stepCommandWithFrame("stepOverStatement", frame);
    244 }
    245 
    246 void ScriptDebugServer::stepOutOfFunction(const ScriptValue& frame)
    247 {
    248     stepCommandWithFrame(stepOutV8MethodName, frame);
    249 }
    250 
    251 bool ScriptDebugServer::setScriptSource(const String& sourceID, const String& newContent, bool preview, String* error, RefPtr<TypeBuilder::Debugger::SetScriptSourceError>& errorData, ScriptValue* newCallFrames, ScriptObject* result)
    252 {
    253     class EnableLiveEditScope {
    254     public:
    255         EnableLiveEditScope() { v8::Debug::SetLiveEditEnabled(true); }
    256         ~EnableLiveEditScope() { v8::Debug::SetLiveEditEnabled(false); }
    257     };
    258 
    259     ensureDebuggerScriptCompiled();
    260     v8::HandleScope scope(m_isolate);
    261 
    262     OwnPtr<v8::Context::Scope> contextScope;
    263     v8::Handle<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
    264     if (!isPaused())
    265         contextScope = adoptPtr(new v8::Context::Scope(debuggerContext));
    266 
    267     v8::Handle<v8::Value> argv[] = { v8String(debuggerContext->GetIsolate(), sourceID), v8String(debuggerContext->GetIsolate(), newContent), v8Boolean(preview, debuggerContext->GetIsolate()) };
    268 
    269     v8::Local<v8::Value> v8result;
    270     {
    271         EnableLiveEditScope enableLiveEditScope;
    272         v8::TryCatch tryCatch;
    273         tryCatch.SetVerbose(false);
    274         v8result = callDebuggerMethod("liveEditScriptSource", 3, argv);
    275         if (tryCatch.HasCaught()) {
    276             v8::Local<v8::Message> message = tryCatch.Message();
    277             if (!message.IsEmpty())
    278                 *error = toCoreStringWithUndefinedOrNullCheck(message->Get());
    279             else
    280                 *error = "Unknown error.";
    281             return false;
    282         }
    283     }
    284     ASSERT(!v8result.IsEmpty());
    285     v8::Local<v8::Object> resultTuple = v8result->ToObject();
    286     int code = static_cast<int>(resultTuple->Get(0)->ToInteger()->Value());
    287     switch (code) {
    288     case 0:
    289         {
    290             v8::Local<v8::Value> normalResult = resultTuple->Get(1);
    291             if (normalResult->IsObject())
    292                 *result = ScriptObject(ScriptState::current(), normalResult->ToObject());
    293             // Call stack may have changed after if the edited function was on the stack.
    294             if (!preview && isPaused())
    295                 *newCallFrames = currentCallFrames();
    296             return true;
    297         }
    298     // Compile error.
    299     case 1:
    300         {
    301             RefPtr<TypeBuilder::Debugger::SetScriptSourceError::CompileError> compileError =
    302                 TypeBuilder::Debugger::SetScriptSourceError::CompileError::create()
    303                     .setMessage(toCoreStringWithUndefinedOrNullCheck(resultTuple->Get(2)))
    304                     .setLineNumber(resultTuple->Get(3)->ToInteger()->Value())
    305                     .setColumnNumber(resultTuple->Get(4)->ToInteger()->Value());
    306 
    307             *error = toCoreStringWithUndefinedOrNullCheck(resultTuple->Get(1));
    308             errorData = TypeBuilder::Debugger::SetScriptSourceError::create();
    309             errorData->setCompileError(compileError);
    310             return false;
    311         }
    312     }
    313     *error = "Unknown error.";
    314     return false;
    315 }
    316 
    317 PassRefPtr<JavaScriptCallFrame> ScriptDebugServer::wrapCallFrames(v8::Handle<v8::Object> executionState, int maximumLimit)
    318 {
    319     v8::Handle<v8::Value> currentCallFrameV8;
    320     if (executionState.IsEmpty()) {
    321         v8::Handle<v8::Function> currentCallFrameFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.newLocal(m_isolate)->Get(v8AtomicString(m_isolate, "currentCallFrame")));
    322         currentCallFrameV8 = v8::Debug::Call(currentCallFrameFunction, v8::Integer::New(maximumLimit, m_isolate));
    323     } else {
    324         v8::Handle<v8::Value> argv[] = { executionState, v8::Integer::New(maximumLimit, m_isolate) };
    325         currentCallFrameV8 = callDebuggerMethod("currentCallFrame", 2, argv);
    326     }
    327     ASSERT(!currentCallFrameV8.IsEmpty());
    328     if (!currentCallFrameV8->IsObject())
    329         return PassRefPtr<JavaScriptCallFrame>();
    330     return JavaScriptCallFrame::create(v8::Debug::GetDebugContext(), v8::Handle<v8::Object>::Cast(currentCallFrameV8));
    331 }
    332 
    333 ScriptValue ScriptDebugServer::currentCallFrames()
    334 {
    335     v8::HandleScope scope(m_isolate);
    336     v8::Handle<v8::Context> pausedContext = m_pausedContext.IsEmpty() ? m_isolate->GetCurrentContext() : m_pausedContext;
    337     if (pausedContext.IsEmpty())
    338         return ScriptValue();
    339 
    340     RefPtr<JavaScriptCallFrame> currentCallFrame = wrapCallFrames(m_executionState.newLocal(m_isolate), -1);
    341     if (!currentCallFrame)
    342         return ScriptValue();
    343 
    344     v8::Context::Scope contextScope(pausedContext);
    345     return ScriptValue(toV8(currentCallFrame.release(), v8::Handle<v8::Object>(), pausedContext->GetIsolate()), pausedContext->GetIsolate());
    346 }
    347 
    348 void ScriptDebugServer::interruptAndRun(PassOwnPtr<Task> task, v8::Isolate* isolate)
    349 {
    350     v8::Debug::DebugBreakForCommand(new ClientDataImpl(task), isolate);
    351 }
    352 
    353 void ScriptDebugServer::runPendingTasks()
    354 {
    355     v8::Debug::ProcessDebugMessages();
    356 }
    357 
    358 static ScriptDebugServer* toScriptDebugServer(v8::Handle<v8::Value> data)
    359 {
    360     void* p = v8::Handle<v8::External>::Cast(data)->Value();
    361     return static_cast<ScriptDebugServer*>(p);
    362 }
    363 
    364 void ScriptDebugServer::breakProgramCallback(const v8::FunctionCallbackInfo<v8::Value>& info)
    365 {
    366     ASSERT(2 == info.Length());
    367     ScriptDebugServer* thisPtr = toScriptDebugServer(info.Data());
    368     v8::Handle<v8::Value> exception;
    369     v8::Handle<v8::Array> hitBreakpoints;
    370     thisPtr->handleProgramBreak(v8::Handle<v8::Object>::Cast(info[0]), exception, hitBreakpoints);
    371 }
    372 
    373 void ScriptDebugServer::handleProgramBreak(v8::Handle<v8::Object> executionState, v8::Handle<v8::Value> exception, v8::Handle<v8::Array> hitBreakpointNumbers)
    374 {
    375     // Don't allow nested breaks.
    376     if (isPaused())
    377         return;
    378 
    379     ScriptDebugListener* listener = getDebugListenerForContext(m_pausedContext);
    380     if (!listener)
    381         return;
    382 
    383     Vector<String> breakpointIds;
    384     if (!hitBreakpointNumbers.IsEmpty()) {
    385         breakpointIds.resize(hitBreakpointNumbers->Length());
    386         for (size_t i = 0; i < hitBreakpointNumbers->Length(); i++) {
    387             v8::Handle<v8::Value> hitBreakpointNumber = hitBreakpointNumbers->Get(i);
    388             ASSERT(!hitBreakpointNumber.IsEmpty() && hitBreakpointNumber->IsInt32());
    389             breakpointIds[i] = String::number(hitBreakpointNumber->Int32Value());
    390         }
    391     }
    392 
    393     m_executionState.set(m_isolate, executionState);
    394     ScriptState* currentCallFrameState = ScriptState::forContext(m_pausedContext);
    395     listener->didPause(currentCallFrameState, currentCallFrames(), ScriptValue(exception, currentCallFrameState->isolate()), breakpointIds);
    396 
    397     m_runningNestedMessageLoop = true;
    398     runMessageLoopOnPause(m_pausedContext);
    399     m_runningNestedMessageLoop = false;
    400 }
    401 
    402 void ScriptDebugServer::handleProgramBreak(const v8::Debug::EventDetails& eventDetails, v8::Handle<v8::Value> exception, v8::Handle<v8::Array> hitBreakpointNumbers)
    403 {
    404     m_pausedContext = eventDetails.GetEventContext();
    405     handleProgramBreak(eventDetails.GetExecutionState(), exception, hitBreakpointNumbers);
    406     m_pausedContext.Clear();
    407 }
    408 
    409 void ScriptDebugServer::v8DebugEventCallback(const v8::Debug::EventDetails& eventDetails)
    410 {
    411     ScriptDebugServer* thisPtr = toScriptDebugServer(eventDetails.GetCallbackData());
    412     thisPtr->handleV8DebugEvent(eventDetails);
    413 }
    414 
    415 bool ScriptDebugServer::executeSkipPauseRequest(ScriptDebugListener::SkipPauseRequest request, v8::Handle<v8::Object> executionState)
    416 {
    417     switch (request) {
    418     case ScriptDebugListener::NoSkip:
    419         return false;
    420     case ScriptDebugListener::Continue:
    421         return true;
    422     case ScriptDebugListener::StepInto:
    423     case ScriptDebugListener::StepOut:
    424         break;
    425     }
    426     v8::Handle<v8::Value> argv[] = { executionState };
    427     callDebuggerMethod(stepIntoV8MethodName, 1, argv);
    428     return true;
    429 }
    430 
    431 void ScriptDebugServer::handleV8DebugEvent(const v8::Debug::EventDetails& eventDetails)
    432 {
    433     v8::DebugEvent event = eventDetails.GetEvent();
    434 
    435     if (event == v8::BreakForCommand) {
    436         ClientDataImpl* data = static_cast<ClientDataImpl*>(eventDetails.GetClientData());
    437         data->task()->run();
    438         return;
    439     }
    440 
    441     if (event != v8::Break && event != v8::Exception && event != v8::AfterCompile && event != v8::BeforeCompile)
    442         return;
    443 
    444     v8::Handle<v8::Context> eventContext = eventDetails.GetEventContext();
    445     ASSERT(!eventContext.IsEmpty());
    446 
    447     ScriptDebugListener* listener = getDebugListenerForContext(eventContext);
    448     if (listener) {
    449         v8::HandleScope scope(m_isolate);
    450         v8::Handle<v8::Object> debuggerScript = m_debuggerScript.newLocal(m_isolate);
    451         if (event == v8::BeforeCompile) {
    452             preprocessBeforeCompile(eventDetails);
    453         } else if (event == v8::AfterCompile) {
    454             v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
    455             v8::Handle<v8::Function> getAfterCompileScript = v8::Local<v8::Function>::Cast(debuggerScript->Get(v8AtomicString(m_isolate, "getAfterCompileScript")));
    456             v8::Handle<v8::Value> argv[] = { eventDetails.GetEventData() };
    457             v8::Handle<v8::Value> value = V8ScriptRunner::callInternalFunction(getAfterCompileScript, debuggerScript, WTF_ARRAY_LENGTH(argv), argv, m_isolate);
    458             ASSERT(value->IsObject());
    459             v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(value);
    460             dispatchDidParseSource(listener, object);
    461         } else if (event == v8::Exception) {
    462             v8::Local<v8::StackTrace> stackTrace = v8::StackTrace::CurrentStackTrace(m_isolate, 1);
    463             // Stack trace is empty in case of syntax error. Silently continue execution in such cases.
    464             if (!stackTrace->GetFrameCount())
    465                 return;
    466             RefPtr<JavaScriptCallFrame> topFrame = wrapCallFrames(eventDetails.GetExecutionState(), 1);
    467             if (executeSkipPauseRequest(listener->shouldSkipExceptionPause(topFrame), eventDetails.GetExecutionState()))
    468                 return;
    469             v8::Handle<v8::Object> eventData = eventDetails.GetEventData();
    470             v8::Handle<v8::Value> exceptionGetterValue = eventData->Get(v8AtomicString(m_isolate, "exception"));
    471             ASSERT(!exceptionGetterValue.IsEmpty() && exceptionGetterValue->IsFunction());
    472             v8::Handle<v8::Value> exception = V8ScriptRunner::callInternalFunction(v8::Handle<v8::Function>::Cast(exceptionGetterValue), eventData, 0, 0, m_isolate);
    473             handleProgramBreak(eventDetails, exception, v8::Handle<v8::Array>());
    474         } else if (event == v8::Break) {
    475             v8::Handle<v8::Function> getBreakpointNumbersFunction = v8::Local<v8::Function>::Cast(debuggerScript->Get(v8AtomicString(m_isolate, "getBreakpointNumbers")));
    476             v8::Handle<v8::Value> argv[] = { eventDetails.GetEventData() };
    477             v8::Handle<v8::Value> hitBreakpoints = V8ScriptRunner::callInternalFunction(getBreakpointNumbersFunction, debuggerScript, WTF_ARRAY_LENGTH(argv), argv, m_isolate);
    478             ASSERT(hitBreakpoints->IsArray());
    479             RefPtr<JavaScriptCallFrame> topFrame = wrapCallFrames(eventDetails.GetExecutionState(), 1);
    480             ScriptDebugListener::SkipPauseRequest skipRequest;
    481             if (v8::Handle<v8::Array>::Cast(hitBreakpoints)->Length())
    482                 skipRequest = listener->shouldSkipBreakpointPause(topFrame);
    483             else
    484                 skipRequest = listener->shouldSkipStepPause(topFrame);
    485             if (executeSkipPauseRequest(skipRequest, eventDetails.GetExecutionState()))
    486                 return;
    487             handleProgramBreak(eventDetails, v8::Handle<v8::Value>(), hitBreakpoints.As<v8::Array>());
    488         }
    489     }
    490 }
    491 
    492 void ScriptDebugServer::dispatchDidParseSource(ScriptDebugListener* listener, v8::Handle<v8::Object> object)
    493 {
    494     v8::Handle<v8::Value> id = object->Get(v8AtomicString(m_isolate, "id"));
    495     ASSERT(!id.IsEmpty() && id->IsInt32());
    496     String sourceID = String::number(id->Int32Value());
    497 
    498     ScriptDebugListener::Script script;
    499     script.url = toCoreStringWithUndefinedOrNullCheck(object->Get(v8AtomicString(m_isolate, "name")));
    500     script.source = toCoreStringWithUndefinedOrNullCheck(object->Get(v8AtomicString(m_isolate, "source")));
    501     script.sourceMappingURL = toCoreStringWithUndefinedOrNullCheck(object->Get(v8AtomicString(m_isolate, "sourceMappingURL")));
    502     script.startLine = object->Get(v8AtomicString(m_isolate, "startLine"))->ToInteger()->Value();
    503     script.startColumn = object->Get(v8AtomicString(m_isolate, "startColumn"))->ToInteger()->Value();
    504     script.endLine = object->Get(v8AtomicString(m_isolate, "endLine"))->ToInteger()->Value();
    505     script.endColumn = object->Get(v8AtomicString(m_isolate, "endColumn"))->ToInteger()->Value();
    506     script.isContentScript = object->Get(v8AtomicString(m_isolate, "isContentScript"))->ToBoolean()->Value();
    507 
    508     listener->didParseSource(sourceID, script);
    509 }
    510 
    511 void ScriptDebugServer::ensureDebuggerScriptCompiled()
    512 {
    513     if (!m_debuggerScript.isEmpty())
    514         return;
    515 
    516     v8::HandleScope scope(m_isolate);
    517     v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
    518     v8::Handle<v8::String> source = v8String(m_isolate, String(reinterpret_cast<const char*>(DebuggerScriptSource_js), sizeof(DebuggerScriptSource_js)));
    519     v8::Local<v8::Value> value = V8ScriptRunner::compileAndRunInternalScript(source, m_isolate);
    520     ASSERT(!value.IsEmpty());
    521     ASSERT(value->IsObject());
    522     m_debuggerScript.set(m_isolate, v8::Handle<v8::Object>::Cast(value));
    523 }
    524 
    525 v8::Local<v8::Value> ScriptDebugServer::functionScopes(v8::Handle<v8::Function> function)
    526 {
    527     ensureDebuggerScriptCompiled();
    528 
    529     v8::Handle<v8::Value> argv[] = { function };
    530     return callDebuggerMethod("getFunctionScopes", 1, argv);
    531 }
    532 
    533 v8::Local<v8::Value> ScriptDebugServer::getInternalProperties(v8::Handle<v8::Object>& object)
    534 {
    535     if (m_debuggerScript.isEmpty())
    536         return v8::Local<v8::Value>::New(m_isolate, v8::Undefined(m_isolate));
    537 
    538     v8::Handle<v8::Value> argv[] = { object };
    539     return callDebuggerMethod("getInternalProperties", 1, argv);
    540 }
    541 
    542 v8::Handle<v8::Value> ScriptDebugServer::setFunctionVariableValue(v8::Handle<v8::Value> functionValue, int scopeNumber, const String& variableName, v8::Handle<v8::Value> newValue)
    543 {
    544     v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
    545     if (m_debuggerScript.isEmpty())
    546         return m_isolate->ThrowException(v8::String::NewFromUtf8(m_isolate, "Debugging is not enabled."));
    547 
    548     v8::Handle<v8::Value> argv[] = {
    549         functionValue,
    550         v8::Handle<v8::Value>(v8::Integer::New(scopeNumber, debuggerContext->GetIsolate())),
    551         v8String(debuggerContext->GetIsolate(), variableName),
    552         newValue
    553     };
    554     return callDebuggerMethod("setFunctionVariableValue", 4, argv);
    555 }
    556 
    557 
    558 bool ScriptDebugServer::isPaused()
    559 {
    560     return !m_executionState.isEmpty();
    561 }
    562 
    563 void ScriptDebugServer::compileScript(ScriptState* state, const String& expression, const String& sourceURL, String* scriptId, String* exceptionMessage)
    564 {
    565     v8::HandleScope handleScope(m_isolate);
    566     v8::Handle<v8::Context> context = state->context();
    567     if (context.IsEmpty())
    568         return;
    569     v8::Context::Scope contextScope(context);
    570 
    571     v8::Handle<v8::String> source = v8String(m_isolate, expression);
    572     v8::TryCatch tryCatch;
    573     v8::Local<v8::Script> script = V8ScriptRunner::compileScript(source, sourceURL, TextPosition(), 0, m_isolate);
    574     if (tryCatch.HasCaught()) {
    575         v8::Local<v8::Message> message = tryCatch.Message();
    576         if (!message.IsEmpty())
    577             *exceptionMessage = toCoreStringWithUndefinedOrNullCheck(message->Get());
    578         return;
    579     }
    580     if (script.IsEmpty())
    581         return;
    582 
    583     *scriptId = String::number(script->GetId());
    584     m_compiledScripts.set(*scriptId, adoptPtr(new ScopedPersistent<v8::Script>(m_isolate, script)));
    585 }
    586 
    587 void ScriptDebugServer::clearCompiledScripts()
    588 {
    589     m_compiledScripts.clear();
    590 }
    591 
    592 void ScriptDebugServer::runScript(ScriptState* state, const String& scriptId, ScriptValue* result, bool* wasThrown, String* exceptionMessage)
    593 {
    594     if (!m_compiledScripts.contains(scriptId))
    595         return;
    596     v8::HandleScope handleScope(m_isolate);
    597     ScopedPersistent<v8::Script>* scriptHandle = m_compiledScripts.get(scriptId);
    598     v8::Local<v8::Script> script = scriptHandle->newLocal(m_isolate);
    599     m_compiledScripts.remove(scriptId);
    600     if (script.IsEmpty())
    601         return;
    602 
    603     v8::Handle<v8::Context> context = state->context();
    604     if (context.IsEmpty())
    605         return;
    606     v8::Context::Scope contextScope(context);
    607     v8::TryCatch tryCatch;
    608     v8::Local<v8::Value> value = V8ScriptRunner::runCompiledScript(script, state->executionContext(), m_isolate);
    609     *wasThrown = false;
    610     if (tryCatch.HasCaught()) {
    611         *wasThrown = true;
    612         *result = ScriptValue(tryCatch.Exception(), m_isolate);
    613         v8::Local<v8::Message> message = tryCatch.Message();
    614         if (!message.IsEmpty())
    615             *exceptionMessage = toCoreStringWithUndefinedOrNullCheck(message->Get());
    616     } else {
    617         *result = ScriptValue(value, m_isolate);
    618     }
    619 }
    620 
    621 PassOwnPtr<ScriptSourceCode> ScriptDebugServer::preprocess(Frame*, const ScriptSourceCode&)
    622 {
    623     return PassOwnPtr<ScriptSourceCode>();
    624 }
    625 
    626 String ScriptDebugServer::preprocessEventListener(Frame*, const String& source, const String& url, const String& functionName)
    627 {
    628     return source;
    629 }
    630 
    631 } // namespace WebCore
    632