DevTools: Support asynchronous call stacks on backend.

Source/bindings/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
@@ skipping 274 matching lines @@
     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);
             if (normalResult->IsObject())
                 *result = ScriptObject(ScriptState::current(), normalResult->ToObject());
             // Call stack may have changed after if the edited function was on the stack.
             if (!preview && isPaused())
-                *newCallFrames = currentCallFrame();
+                *newCallFrames = currentCallFrames();
             return true;
         }
     // Compile error.
     case 1:
         {
             RefPtr<TypeBuilder::Debugger::SetScriptSourceError::CompileError> compileError =
                 TypeBuilder::Debugger::SetScriptSourceError::CompileError::create()
                     .setMessage(toWebCoreStringWithUndefinedOrNullCheck(resultTuple->Get(2)))
                     .setLineNumber(resultTuple->Get(3)->ToInteger()->Value())
                     .setColumnNumber(resultTuple->Get(4)->ToInteger()->Value());
 
             *error = toWebCoreStringWithUndefinedOrNullCheck(resultTuple->Get(1));
             errorData = TypeBuilder::Debugger::SetScriptSourceError::create();
             errorData->setCompileError(compileError);
             return false;
         }
     }
     *error = "Unknown error.";
     return false;
 }
 
-
-void ScriptDebugServer::updateCallStack(ScriptValue* callFrame)
-{
-    if (isPaused())
-        *callFrame = currentCallFrame();
-}
-
 PassRefPtr<JavaScriptCallFrame> ScriptDebugServer::wrapCallFrames(v8::Handle<v8::Object> executionState, int maximumLimit)
 {
-    v8::Handle<v8::Value> argv[] = { executionState, v8::Integer::New(maximumLimit, m_isolate) };
-    v8::Handle<v8::Value> currentCallFrameV8 = callDebuggerMethod("currentCallFrame", 2, argv);
-
+    v8::Handle<v8::Value> currentCallFrameV8;
+    if (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(maximumLimit, m_isolate));
+    } else {
+        v8::Handle<v8::Value> argv[] = { executionState, v8::Integer::New(maximumLimit, m_isolate) };
+        currentCallFrameV8 = callDebuggerMethod("currentCallFrame", 2, argv);
+    }
     ASSERT(!currentCallFrameV8.IsEmpty());
     if (!currentCallFrameV8->IsObject())
         return PassRefPtr<JavaScriptCallFrame>();
     return JavaScriptCallFrame::create(v8::Debug::GetDebugContext(), v8::Handle<v8::Object>::Cast(currentCallFrameV8));
 }
 
-ScriptValue ScriptDebugServer::currentCallFrame()
+ScriptValue ScriptDebugServer::currentCallFrames()
 {
-    ASSERT(isPaused());
     v8::HandleScope handleScope(m_isolate);
     RefPtr<JavaScriptCallFrame> currentCallFrame = wrapCallFrames(m_executionState.newLocal(m_isolate), -1);
     if (!currentCallFrame)
         return ScriptValue(v8::Null(m_isolate), m_isolate);
-    v8::Context::Scope contextScope(m_pausedContext);
-    return ScriptValue(toV8(currentCallFrame.release(), v8::Handle<v8::Object>(), m_pausedContext->GetIsolate()), m_pausedContext->GetIsolate());
+
+    v8::HandleScope scope(m_isolate);
+    v8::Handle<v8::Context> pausedContext = m_pausedContext.IsEmpty() ? m_isolate->GetCurrentContext() : m_pausedContext;
+    if (pausedContext.IsEmpty())
+        return ScriptValue(v8::Null(m_isolate), m_isolate);
+
+    v8::Context::Scope contextScope(pausedContext);
+    return ScriptValue(toV8(currentCallFrame.release(), v8::Handle<v8::Object>(), pausedContext->GetIsolate()), pausedContext->GetIsolate());
 }
 
 void ScriptDebugServer::interruptAndRun(PassOwnPtr<Task> task, v8::Isolate* isolate)
 {
     v8::Debug::DebugBreakForCommand(new ClientDataImpl(task), isolate);
 }
 
 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());
     v8::Handle<v8::Value> exception;
     v8::Handle<v8::Array> hitBreakpoints;
     thisPtr->handleProgramBreak(v8::Handle<v8::Object>::Cast(info[0]), exception, hitBreakpoints);
 }
 
 void ScriptDebugServer::handleProgramBreak(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(m_pausedContext);
     if (!listener)
         return;
 
     Vector<String> breakpointIds;
     if (!hitBreakpointNumbers.IsEmpty()) {
         breakpointIds.resize(hitBreakpointNumbers->Length());
         for (size_t i = 0; i < hitBreakpointNumbers->Length(); i++)
             breakpointIds[i] = toWebCoreStringWithUndefinedOrNullCheck(hitBreakpointNumbers->Get(i));
     }
 
     m_executionState.set(m_isolate, executionState);
     ScriptState* currentCallFrameState = ScriptState::forContext(m_pausedContext);
-    listener->didPause(currentCallFrameState, currentCallFrame(), ScriptValue(exception, currentCallFrameState->isolate()), breakpointIds);
+    listener->didPause(currentCallFrameState, currentCallFrames(), ScriptValue(exception, currentCallFrameState->isolate()), breakpointIds);
 
     m_runningNestedMessageLoop = true;
     runMessageLoopOnPause(m_pausedContext);
     m_runningNestedMessageLoop = false;
 }
 
 void ScriptDebugServer::handleProgramBreak(const v8::Debug::EventDetails& eventDetails, v8::Handle<v8::Value> exception, v8::Handle<v8::Array> hitBreakpointNumbers)
 {
     m_pausedContext = eventDetails.GetEventContext();
     handleProgramBreak(eventDetails.GetExecutionState(), exception, hitBreakpointNumbers);
@@ skipping 214 matching lines @@
 {
     return PassOwnPtr<ScriptSourceCode>();
 }
 
 String ScriptDebugServer::preprocessEventListener(Frame*, const String& source, const String& url, const String& functionName)
 {
     return source;
 }
 
 } // namespace WebCore