Wire up the Inspector V8 Debugger

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

+/*
+ * Copyright (c) 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/PageScriptDebugServer.h"
+
+#include "bindings/core/v8/DOMWrapperWorld.h"
+#include "bindings/core/v8/ScriptController.h"
+#include "bindings/core/v8/ScriptSourceCode.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8ScriptRunner.h"
+#include "bindings/core/v8/V8Window.h"
+#include "bindings/core/v8/WindowProxy.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/frame/FrameConsole.h"
+#include "core/frame/FrameHost.h"
+#include "core/frame/LocalFrame.h"
+#include "core/frame/UseCounter.h"
+#include "core/inspector/InspectorTraceEvents.h"
+#include "core/inspector/ScriptDebugListener.h"
+#include "core/page/Page.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
+#include "wtf/StdLibExtras.h"
+#include "wtf/TemporaryChange.h"
+#include "wtf/text/StringBuilder.h"
+
+namespace blink {
+
+static LocalFrame* retrieveFrameWithGlobalObjectCheck(v8::Handle<v8::Context> context)
+{
+    if (context.IsEmpty())
+        return 0;
+
+    // FIXME: This is a temporary hack for crbug.com/345014.
+    // Currently it's possible that V8 can trigger Debugger::ProcessDebugEvent for a context
+    // that is being initialized (i.e., inside Context::New() of the context).
+    // We should fix the V8 side so that it won't trigger the event for a half-baked context
+    // because there is no way in the embedder side to check if the context is half-baked or not.
+    if (isMainThread() && DOMWrapperWorld::windowIsBeingInitialized())
+        return 0;
+
+    v8::Handle<v8::Value> global = V8Window::findInstanceInPrototypeChain(context->Global(), context->GetIsolate());
+    if (global.IsEmpty())
+        return 0;
+
+    return toFrameIfNotDetached(context);
+}
+
+void PageScriptDebugServer::setPreprocessorSource(const String& preprocessorSource)
+{
+    if (preprocessorSource.isEmpty())
+        m_preprocessorSourceCode.clear();
+    else
+        m_preprocessorSourceCode = adoptPtr(new ScriptSourceCode(preprocessorSource));
+    m_scriptPreprocessor.clear();
+}
+
+PageScriptDebugServer& PageScriptDebugServer::shared()
+{
+    DEFINE_STATIC_LOCAL(PageScriptDebugServer, server, ());
+    return server;
+}
+
+v8::Isolate* PageScriptDebugServer::s_mainThreadIsolate = 0;
+
+void PageScriptDebugServer::setMainThreadIsolate(v8::Isolate* isolate)
+{
+    s_mainThreadIsolate = isolate;
+}
+
+PageScriptDebugServer::PageScriptDebugServer()
+    : ScriptDebugServer(s_mainThreadIsolate)
+    , m_pausedPage(0)
+{
+}
+
+PageScriptDebugServer::~PageScriptDebugServer()
+{
+}
+
+void PageScriptDebugServer::addListener(ScriptDebugListener* listener, Page* page)
+{
+    ScriptController& scriptController = page->mainFrame()->script();
+
+    v8::HandleScope scope(m_isolate);
+
+    if (!m_listenersMap.size()) {
+        v8::Debug::SetDebugEventListener(&PageScriptDebugServer::v8DebugEventCallback, v8::External::New(m_isolate, this));
+        ensureDebuggerScriptCompiled();
+    }
+
+    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
+    v8::Context::Scope contextScope(debuggerContext);
+
+    v8::Local<v8::Object> debuggerScript = m_debuggerScript.newLocal(m_isolate);
+    ASSERT(!debuggerScript->IsUndefined());
+    m_listenersMap.set(page, listener);
+
+    WindowProxy* windowProxy = scriptController.existingWindowProxy(DOMWrapperWorld::mainWorld());
+    if (!windowProxy || !windowProxy->isContextInitialized())
+        return;
+    v8::Local<v8::Context> context = windowProxy->context();
+    v8::Handle<v8::Function> getScriptsFunction = v8::Local<v8::Function>::Cast(debuggerScript->Get(v8AtomicString(m_isolate, "getScripts")));
+    v8::Handle<v8::Value> argv[] = { context->GetEmbedderData(0) };
+    v8::Handle<v8::Value> value = V8ScriptRunner::callInternalFunction(getScriptsFunction, debuggerScript, WTF_ARRAY_LENGTH(argv), argv, m_isolate);
+    if (value.IsEmpty())
+        return;
+    ASSERT(!value->IsUndefined() && value->IsArray());
+    v8::Handle<v8::Array> scriptsArray = v8::Handle<v8::Array>::Cast(value);
+    for (unsigned i = 0; i < scriptsArray->Length(); ++i)
+        dispatchDidParseSource(listener, v8::Handle<v8::Object>::Cast(scriptsArray->Get(v8::Integer::New(m_isolate, i))), CompileSuccess);
+}
+
+void PageScriptDebugServer::removeListener(ScriptDebugListener* listener, Page* page)
+{
+    if (!m_listenersMap.contains(page))
+        return;
+
+    if (m_pausedPage == page)
+        continueProgram();
+
+    m_listenersMap.remove(page);
+
+    if (m_listenersMap.isEmpty()) {
+        discardDebuggerScript();
+        v8::Debug::SetDebugEventListener(0);
+        // FIXME: Remove all breakpoints set by the agent.
+    }
+}
+
+void PageScriptDebugServer::interruptAndRun(PassOwnPtr<Task> task)
+{
+    ScriptDebugServer::interruptAndRun(task, s_mainThreadIsolate);
+}
+
+void PageScriptDebugServer::setClientMessageLoop(PassOwnPtr<ClientMessageLoop> clientMessageLoop)
+{
+    m_clientMessageLoop = clientMessageLoop;
+}
+
+void PageScriptDebugServer::compileScript(ScriptState* scriptState, const String& expression, const String& sourceURL, String* scriptId, String* exceptionDetailsText, int* lineNumber, int* columnNumber, RefPtr<ScriptCallStack>* stackTrace)
+{
+    ExecutionContext* executionContext = scriptState->executionContext();
+    RefPtr<LocalFrame> protect = executionContext->executingWindow()->frame();
+    ScriptDebugServer::compileScript(scriptState, expression, sourceURL, scriptId, exceptionDetailsText, lineNumber, columnNumber, stackTrace);
+    if (!scriptId->isNull())
+        m_compiledScriptURLs.set(*scriptId, sourceURL);
+}
+
+void PageScriptDebugServer::clearCompiledScripts()
+{
+    ScriptDebugServer::clearCompiledScripts();
+    m_compiledScriptURLs.clear();
+}
+
+void PageScriptDebugServer::runScript(ScriptState* scriptState, const String& scriptId, ScriptValue* result, bool* wasThrown, String* exceptionDetailsText, int* lineNumber, int* columnNumber, RefPtr<ScriptCallStack>* stackTrace)
+{
+    String sourceURL = m_compiledScriptURLs.take(scriptId);
+
+    ExecutionContext* executionContext = scriptState->executionContext();
+    LocalFrame* frame = executionContext->executingWindow()->frame();
+    TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "EvaluateScript", "data", InspectorEvaluateScriptEvent::data(frame, sourceURL, TextPosition::minimumPosition().m_line.oneBasedInt()));
+    TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline.stack"), "CallStack", TRACE_EVENT_SCOPE_PROCESS, "stack", InspectorCallStackEvent::currentCallStack());
+
+    RefPtr<LocalFrame> protect = frame;
+    ScriptDebugServer::runScript(scriptState, scriptId, result, wasThrown, exceptionDetailsText, lineNumber, columnNumber, stackTrace);
+
+    TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "UpdateCounters", TRACE_EVENT_SCOPE_PROCESS, "data", InspectorUpdateCountersEvent::data());
+}
+
+ScriptDebugListener* PageScriptDebugServer::getDebugListenerForContext(v8::Handle<v8::Context> context)
+{
+    v8::HandleScope scope(m_isolate);
+    LocalFrame* frame = retrieveFrameWithGlobalObjectCheck(context);
+    if (!frame)
+        return 0;
+    return m_listenersMap.get(frame->page());
+}
+
+void PageScriptDebugServer::runMessageLoopOnPause(v8::Handle<v8::Context> context)
+{
+    v8::HandleScope scope(m_isolate);
+    LocalFrame* frame = retrieveFrameWithGlobalObjectCheck(context);
+    m_pausedPage = frame->page();
+
+    // Wait for continue or step command.
+    m_clientMessageLoop->run(m_pausedPage);
+
+    // The listener may have been removed in the nested loop.
+    if (ScriptDebugListener* listener = m_listenersMap.get(m_pausedPage))
+        listener->didContinue();
+
+    m_pausedPage = 0;
+}
+
+void PageScriptDebugServer::quitMessageLoopOnPause()
+{
+    m_clientMessageLoop->quitNow();
+}
+
+void PageScriptDebugServer::preprocessBeforeCompile(const v8::Debug::EventDetails& eventDetails)
+{
+    v8::Handle<v8::Context> eventContext = eventDetails.GetEventContext();
+    LocalFrame* frame = retrieveFrameWithGlobalObjectCheck(eventContext);
+    if (!frame)
+        return;
+
+    if (!canPreprocess(frame))
+        return;
+
+    v8::Handle<v8::Object> eventData = eventDetails.GetEventData();
+    v8::Local<v8::Context> debugContext = v8::Debug::GetDebugContext();
+    v8::Context::Scope contextScope(debugContext);
+    v8::TryCatch tryCatch;
+    // <script> tag source and attribute value source are preprocessed before we enter V8.
+    // Avoid preprocessing any internal scripts by processing only eval source in this V8 event handler.
+    v8::Handle<v8::Value> argvEventData[] = { eventData };
+    v8::Handle<v8::Value> v8Value = callDebuggerMethod("isEvalCompilation", WTF_ARRAY_LENGTH(argvEventData), argvEventData);
+    if (v8Value.IsEmpty() || !v8Value->ToBoolean()->Value())
+        return;
+
+    // The name and source are in the JS event data.
+    String scriptName = toCoreStringWithUndefinedOrNullCheck(callDebuggerMethod("getScriptName", WTF_ARRAY_LENGTH(argvEventData), argvEventData));
+    String script = toCoreStringWithUndefinedOrNullCheck(callDebuggerMethod("getScriptSource", WTF_ARRAY_LENGTH(argvEventData), argvEventData));
+
+    String preprocessedSource  = m_scriptPreprocessor->preprocessSourceCode(script, scriptName);
+
+    v8::Handle<v8::Value> argvPreprocessedScript[] = { eventData, v8String(debugContext->GetIsolate(), preprocessedSource) };
+    callDebuggerMethod("setScriptSource", WTF_ARRAY_LENGTH(argvPreprocessedScript), argvPreprocessedScript);
+}
+
+static bool isCreatingPreprocessor = false;
+
+bool PageScriptDebugServer::canPreprocess(LocalFrame* frame)
+{
+    ASSERT(frame);
+
+    if (!m_preprocessorSourceCode || !frame->page() || isCreatingPreprocessor)
+        return false;
+
+    // We delay the creation of the preprocessor until just before the first JS from the
+    // Web page to ensure that the debugger's console initialization code has completed.
+    if (!m_scriptPreprocessor) {
+        TemporaryChange<bool> isPreprocessing(isCreatingPreprocessor, true);
+        m_scriptPreprocessor = adoptPtr(new ScriptPreprocessor(*m_preprocessorSourceCode.get(), frame));
+    }
+
+    if (m_scriptPreprocessor->isValid())
+        return true;
+
+    m_scriptPreprocessor.clear();
+    // Don't retry the compile if we fail one time.
+    m_preprocessorSourceCode.clear();
+    return false;
+}
+
+// Source to Source processing iff debugger enabled and it has loaded a preprocessor.
+PassOwnPtr<ScriptSourceCode> PageScriptDebugServer::preprocess(LocalFrame* frame, const ScriptSourceCode& sourceCode)
+{
+    if (!canPreprocess(frame))
+        return PassOwnPtr<ScriptSourceCode>();
+
+    String preprocessedSource = m_scriptPreprocessor->preprocessSourceCode(sourceCode.source(), sourceCode.url());
+    return adoptPtr(new ScriptSourceCode(preprocessedSource, sourceCode.url()));
+}
+
+String PageScriptDebugServer::preprocessEventListener(LocalFrame* frame, const String& source, const String& url, const String& functionName)
+{
+    if (!canPreprocess(frame))
+        return source;
+
+    return m_scriptPreprocessor->preprocessSourceCode(source, url, functionName);
+}
+
+void PageScriptDebugServer::clearPreprocessor()
+{
+    m_scriptPreprocessor.clear();
+}
+
+void PageScriptDebugServer::muteWarningsAndDeprecations()
+{
+    FrameConsole::mute();
+    UseCounter::muteForInspector();
+}
+
+void PageScriptDebugServer::unmuteWarningsAndDeprecations()
+{
+    FrameConsole::unmute();
+    UseCounter::unmuteForInspector();
+}
+
+} // namespace blink