Source/JavaScriptCore/inspector/ScriptDebugServer.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2008, 2009, 2013, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2010-2011 Google Inc. All rights reserved.
  * Copyright (C) 2013 University of Washington. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  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.
  * 3.  Neither the name of Apple Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 "ScriptDebugServer.h"

 #include "DebuggerCallFrame.h"
 #include "DebuggerScope.h"
 #include "Exception.h"
 #include "JSCInlines.h"
 #include "JSJavaScriptCallFrame.h"
 #include "JavaScriptCallFrame.h"
 #include "SourceProvider.h"
 #include <wtf/NeverDestroyed.h>
 #include <wtf/SetForScope.h>

 using namespace JSC;

 namespace Inspector {

 ScriptDebugServer::ScriptDebugServer(VM& vm)
     : Debugger(vm)
 {
 }

 ScriptDebugServer::~ScriptDebugServer()
 {
 }

 void ScriptDebugServer::setBreakpointActions(BreakpointID id, const ScriptBreakpoint& scriptBreakpoint)
 {
     ASSERT(id != noBreakpointID);
     ASSERT(!m_breakpointIDToActions.contains(id));

     m_breakpointIDToActions.set(id, scriptBreakpoint.actions);
 }

 void ScriptDebugServer::removeBreakpointActions(BreakpointID id)
 {
     ASSERT(id != noBreakpointID);

     m_breakpointIDToActions.remove(id);
 }

 const BreakpointActions& ScriptDebugServer::getActionsForBreakpoint(BreakpointID id)
 {
     ASSERT(id != noBreakpointID);

     auto entry = m_breakpointIDToActions.find(id);
     if (entry != m_breakpointIDToActions.end())
         return entry->value;

     static NeverDestroyed<BreakpointActions> emptyActionVector = BreakpointActions();
     return emptyActionVector;
 }

 void ScriptDebugServer::clearBreakpointActions()
 {
     m_breakpointIDToActions.clear();
 }

 bool ScriptDebugServer::evaluateBreakpointAction(const ScriptBreakpointAction& breakpointAction)
 {
     DebuggerCallFrame& debuggerCallFrame = currentDebuggerCallFrame();

     switch (breakpointAction.type) {
     case ScriptBreakpointActionTypeLog: {
         dispatchBreakpointActionLog(debuggerCallFrame.globalExec(), breakpointAction.data);
         break;
     }
     case ScriptBreakpointActionTypeEvaluate: {
         NakedPtr<Exception> exception;
         JSObject* scopeExtensionObject = nullptr;
         debuggerCallFrame.evaluateWithScopeExtension(breakpointAction.data, scopeExtensionObject, exception);
         if (exception)
             reportException(debuggerCallFrame.globalExec(), exception);
         break;
     }
     case ScriptBreakpointActionTypeSound:
         dispatchBreakpointActionSound(debuggerCallFrame.globalExec(), breakpointAction.identifier);
         break;
     case ScriptBreakpointActionTypeProbe: {
         NakedPtr<Exception> exception;
         JSObject* scopeExtensionObject = nullptr;
         JSValue result = debuggerCallFrame.evaluateWithScopeExtension(breakpointAction.data, scopeExtensionObject, exception);
         JSC::ExecState* exec = debuggerCallFrame.globalExec();
         if (exception)
             reportException(exec, exception);

         dispatchBreakpointActionProbe(exec, breakpointAction, exception ? exception->value() : result);
         break;
     }
     default:
         ASSERT_NOT_REACHED();
     }

     return true;
 }

 void ScriptDebugServer::dispatchDidPause(ScriptDebugListener* listener)
 {
     ASSERT(isPaused());
     DebuggerCallFrame& debuggerCallFrame = currentDebuggerCallFrame();
     JSGlobalObject* globalObject = debuggerCallFrame.scope()->globalObject();
     JSC::ExecState& state = *globalObject->globalExec();
     JSValue jsCallFrame = toJS(&state, globalObject, JavaScriptCallFrame::create(debuggerCallFrame).ptr());
     listener->didPause(state, jsCallFrame, exceptionOrCaughtValue(&state));
 }

 void ScriptDebugServer::dispatchBreakpointActionLog(ExecState* exec, const String& message)
 {
     if (m_callingListeners)
         return;

     if (m_listeners.isEmpty())
         return;

     SetForScope<bool> change(m_callingListeners, true);

     for (auto* listener : copyToVector(m_listeners))
         listener->breakpointActionLog(*exec, message);
 }

 void ScriptDebugServer::dispatchBreakpointActionSound(ExecState*, int breakpointActionIdentifier)
 {
     if (m_callingListeners)
         return;

     if (m_listeners.isEmpty())
         return;

     SetForScope<bool> change(m_callingListeners, true);

     for (auto* listener : copyToVector(m_listeners))
         listener->breakpointActionSound(breakpointActionIdentifier);
 }

 void ScriptDebugServer::dispatchBreakpointActionProbe(ExecState* exec, const ScriptBreakpointAction& action, JSC::JSValue sampleValue)
 {
     if (m_callingListeners)
         return;

     if (m_listeners.isEmpty())
         return;

     SetForScope<bool> change(m_callingListeners, true);

     unsigned sampleId = m_nextProbeSampleId++;

     for (auto* listener : copyToVector(m_listeners))
         listener->breakpointActionProbe(*exec, action, m_currentProbeBatchId, sampleId, sampleValue);
 }

 void ScriptDebugServer::dispatchDidContinue(ScriptDebugListener* listener)
 {
     listener->didContinue();
 }

 void ScriptDebugServer::dispatchDidParseSource(const ListenerSet& listeners, SourceProvider* sourceProvider, bool isContentScript)
 {
     JSC::SourceID sourceID = sourceProvider->asID();

     // FIXME: <https://webkit.org/b/162773> Web Inspector: Simplify ScriptDebugListener::Script to use SourceProvider
     ScriptDebugListener::Script script;
     script.sourceProvider = sourceProvider;
     script.url = sourceProvider->url();
     script.source = sourceProvider->source().toString();
     script.startLine = sourceProvider->startPosition().m_line.zeroBasedInt();
     script.startColumn = sourceProvider->startPosition().m_column.zeroBasedInt();
     script.isContentScript = isContentScript;
     script.sourceURL = sourceProvider->sourceURL();
     script.sourceMappingURL = sourceProvider->sourceMappingURL();

     int sourceLength = script.source.length();
     int lineCount = 1;
     int lastLineStart = 0;
     for (int i = 0; i < sourceLength; ++i) {
         if (script.source[i] == '\n') {
             lineCount += 1;
             lastLineStart = i + 1;
         }
     }

     script.endLine = script.startLine + lineCount - 1;
     if (lineCount == 1)
         script.endColumn = script.startColumn + sourceLength;
     else
         script.endColumn = sourceLength - lastLineStart;

     for (auto* listener : copyToVector(listeners))
         listener->didParseSource(sourceID, script);
 }

 void ScriptDebugServer::dispatchFailedToParseSource(const ListenerSet& listeners, SourceProvider* sourceProvider, int errorLine, const String& errorMessage)
 {
     String url = sourceProvider->url();
     String data = sourceProvider->source().toString();
     int firstLine = sourceProvider->startPosition().m_line.oneBasedInt();

     for (auto* listener : copyToVector(listeners))
         listener->failedToParseSource(url, data, firstLine, errorLine, errorMessage);
 }

 void ScriptDebugServer::sourceParsed(ExecState* exec, SourceProvider* sourceProvider, int errorLine, const String& errorMessage)
 {
     if (m_callingListeners)
         return;

     if (m_listeners.isEmpty())
         return;

     SetForScope<bool> change(m_callingListeners, true);

     bool isError = errorLine != -1;
     if (isError)
         dispatchFailedToParseSource(m_listeners, sourceProvider, errorLine, errorMessage);
     else
         dispatchDidParseSource(m_listeners, sourceProvider, isContentScript(exec));
 }

 void ScriptDebugServer::dispatchFunctionToListeners(JavaScriptExecutionCallback callback)
 {
     if (m_callingListeners)
         return;

     if (m_listeners.isEmpty())
         return;

     SetForScope<bool> change(m_callingListeners, true);

     dispatchFunctionToListeners(m_listeners, callback);
 }

 void ScriptDebugServer::dispatchFunctionToListeners(const ListenerSet& listeners, JavaScriptExecutionCallback callback)
 {
     for (auto* listener : copyToVector(listeners))
         (this->*callback)(listener);
 }

 void ScriptDebugServer::notifyDoneProcessingDebuggerEvents()
 {
     m_doneProcessingDebuggerEvents = true;
 }

 void ScriptDebugServer::handleBreakpointHit(JSC::JSGlobalObject* globalObject, const JSC::Breakpoint& breakpoint)
 {
     ASSERT(isAttached(globalObject));

     m_currentProbeBatchId++;

     auto entry = m_breakpointIDToActions.find(breakpoint.id);
     if (entry != m_breakpointIDToActions.end()) {
         BreakpointActions actions = entry->value;
         for (size_t i = 0; i < actions.size(); ++i) {
             if (!evaluateBreakpointAction(actions[i]))
                 return;
             if (!isAttached(globalObject))
                 return;
         }
     }
 }

 void ScriptDebugServer::handleExceptionInBreakpointCondition(JSC::ExecState* exec, JSC::Exception* exception) const
 {
     reportException(exec, exception);
 }

 void ScriptDebugServer::handlePause(JSGlobalObject* vmEntryGlobalObject, Debugger::ReasonForPause)
 {
     dispatchFunctionToListeners(&ScriptDebugServer::dispatchDidPause);
     didPause(vmEntryGlobalObject);

     m_doneProcessingDebuggerEvents = false;
     runEventLoopWhilePaused();

     didContinue(vmEntryGlobalObject);
     dispatchFunctionToListeners(&ScriptDebugServer::dispatchDidContinue);
 }

 void ScriptDebugServer::addListener(ScriptDebugListener* listener)
 {
     ASSERT(listener);

     bool wasEmpty = m_listeners.isEmpty();
     m_listeners.add(listener);

     // First listener. Attach the debugger.
     if (wasEmpty)
         attachDebugger();
 }

 void ScriptDebugServer::removeListener(ScriptDebugListener* listener, bool isBeingDestroyed)
 {
     ASSERT(listener);

     m_listeners.remove(listener);

     // Last listener. Detach the debugger.
     if (m_listeners.isEmpty())
         detachDebugger(isBeingDestroyed);
 }

 JSC::JSValue ScriptDebugServer::exceptionOrCaughtValue(JSC::ExecState* state)
 {
     if (reasonForPause() == PausedForException)
         return currentException();

     for (RefPtr<DebuggerCallFrame> frame = &currentDebuggerCallFrame(); frame; frame = frame->callerFrame()) {
         DebuggerScope& scope = *frame->scope();
         if (scope.isCatchScope())
             return scope.caughtValue(state);
     }

     return { };
 }

 } // namespace Inspector
	/*
	* Copyright (C) 2008, 2009, 2013, 2014 Apple Inc. All rights reserved.
	* Copyright (C) 2010-2011 Google Inc. All rights reserved.
	* Copyright (C) 2013 University of Washington. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. 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.
	* 3. Neither the name of Apple Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 "ScriptDebugServer.h"

	#include "DebuggerCallFrame.h"
	#include "DebuggerScope.h"
	#include "Exception.h"
	#include "JSCInlines.h"
	#include "JSJavaScriptCallFrame.h"
	#include "JavaScriptCallFrame.h"
	#include "SourceProvider.h"
	#include <wtf/NeverDestroyed.h>
	#include <wtf/SetForScope.h>

	using namespace JSC;

	namespace Inspector {

	ScriptDebugServer::ScriptDebugServer(VM& vm)
	: Debugger(vm)
	{
	}

	ScriptDebugServer::~ScriptDebugServer()
	{
	}

	void ScriptDebugServer::setBreakpointActions(BreakpointID id, const ScriptBreakpoint& scriptBreakpoint)
	{
	ASSERT(id != noBreakpointID);
	ASSERT(!m_breakpointIDToActions.contains(id));

	m_breakpointIDToActions.set(id, scriptBreakpoint.actions);
	}

	void ScriptDebugServer::removeBreakpointActions(BreakpointID id)
	{
	ASSERT(id != noBreakpointID);

	m_breakpointIDToActions.remove(id);
	}

	const BreakpointActions& ScriptDebugServer::getActionsForBreakpoint(BreakpointID id)
	{
	ASSERT(id != noBreakpointID);

	auto entry = m_breakpointIDToActions.find(id);
	if (entry != m_breakpointIDToActions.end())
	return entry->value;

	static NeverDestroyed<BreakpointActions> emptyActionVector = BreakpointActions();
	return emptyActionVector;
	}

	void ScriptDebugServer::clearBreakpointActions()
	{
	m_breakpointIDToActions.clear();
	}

	bool ScriptDebugServer::evaluateBreakpointAction(const ScriptBreakpointAction& breakpointAction)
	{
	DebuggerCallFrame& debuggerCallFrame = currentDebuggerCallFrame();

	switch (breakpointAction.type) {
	case ScriptBreakpointActionTypeLog: {
	dispatchBreakpointActionLog(debuggerCallFrame.globalExec(), breakpointAction.data);
	break;
	}
	case ScriptBreakpointActionTypeEvaluate: {
	NakedPtr<Exception> exception;
	JSObject* scopeExtensionObject = nullptr;
	debuggerCallFrame.evaluateWithScopeExtension(breakpointAction.data, scopeExtensionObject, exception);
	if (exception)
	reportException(debuggerCallFrame.globalExec(), exception);
	break;
	}
	case ScriptBreakpointActionTypeSound:
	dispatchBreakpointActionSound(debuggerCallFrame.globalExec(), breakpointAction.identifier);
	break;
	case ScriptBreakpointActionTypeProbe: {
	NakedPtr<Exception> exception;
	JSObject* scopeExtensionObject = nullptr;
	JSValue result = debuggerCallFrame.evaluateWithScopeExtension(breakpointAction.data, scopeExtensionObject, exception);
	JSC::ExecState* exec = debuggerCallFrame.globalExec();
	if (exception)
	reportException(exec, exception);

	dispatchBreakpointActionProbe(exec, breakpointAction, exception ? exception->value() : result);
	break;
	}
	default:
	ASSERT_NOT_REACHED();
	}

	return true;
	}

	void ScriptDebugServer::dispatchDidPause(ScriptDebugListener* listener)
	{
	ASSERT(isPaused());
	DebuggerCallFrame& debuggerCallFrame = currentDebuggerCallFrame();
	JSGlobalObject* globalObject = debuggerCallFrame.scope()->globalObject();
	JSC::ExecState& state = *globalObject->globalExec();
	JSValue jsCallFrame = toJS(&state, globalObject, JavaScriptCallFrame::create(debuggerCallFrame).ptr());
	listener->didPause(state, jsCallFrame, exceptionOrCaughtValue(&state));
	}

	void ScriptDebugServer::dispatchBreakpointActionLog(ExecState* exec, const String& message)
	{
	if (m_callingListeners)
	return;

	if (m_listeners.isEmpty())
	return;

	SetForScope<bool> change(m_callingListeners, true);

	for (auto* listener : copyToVector(m_listeners))
	listener->breakpointActionLog(*exec, message);
	}

	void ScriptDebugServer::dispatchBreakpointActionSound(ExecState*, int breakpointActionIdentifier)
	{
	if (m_callingListeners)
	return;

	if (m_listeners.isEmpty())
	return;

	SetForScope<bool> change(m_callingListeners, true);

	for (auto* listener : copyToVector(m_listeners))
	listener->breakpointActionSound(breakpointActionIdentifier);
	}

	void ScriptDebugServer::dispatchBreakpointActionProbe(ExecState* exec, const ScriptBreakpointAction& action, JSC::JSValue sampleValue)
	{
	if (m_callingListeners)
	return;

	if (m_listeners.isEmpty())
	return;

	SetForScope<bool> change(m_callingListeners, true);

	unsigned sampleId = m_nextProbeSampleId++;

	for (auto* listener : copyToVector(m_listeners))
	listener->breakpointActionProbe(*exec, action, m_currentProbeBatchId, sampleId, sampleValue);
	}

	void ScriptDebugServer::dispatchDidContinue(ScriptDebugListener* listener)
	{
	listener->didContinue();
	}

	void ScriptDebugServer::dispatchDidParseSource(const ListenerSet& listeners, SourceProvider* sourceProvider, bool isContentScript)
	{
	JSC::SourceID sourceID = sourceProvider->asID();

	// FIXME: <https://webkit.org/b/162773> Web Inspector: Simplify ScriptDebugListener::Script to use SourceProvider
	ScriptDebugListener::Script script;
	script.sourceProvider = sourceProvider;
	script.url = sourceProvider->url();
	script.source = sourceProvider->source().toString();
	script.startLine = sourceProvider->startPosition().m_line.zeroBasedInt();
	script.startColumn = sourceProvider->startPosition().m_column.zeroBasedInt();
	script.isContentScript = isContentScript;
	script.sourceURL = sourceProvider->sourceURL();
	script.sourceMappingURL = sourceProvider->sourceMappingURL();

	int sourceLength = script.source.length();
	int lineCount = 1;
	int lastLineStart = 0;
	for (int i = 0; i < sourceLength; ++i) {
	if (script.source[i] == '\n') {
	lineCount += 1;
	lastLineStart = i + 1;
	}
	}

	script.endLine = script.startLine + lineCount - 1;
	if (lineCount == 1)
	script.endColumn = script.startColumn + sourceLength;
	else
	script.endColumn = sourceLength - lastLineStart;

	for (auto* listener : copyToVector(listeners))
	listener->didParseSource(sourceID, script);
	}

	void ScriptDebugServer::dispatchFailedToParseSource(const ListenerSet& listeners, SourceProvider* sourceProvider, int errorLine, const String& errorMessage)
	{
	String url = sourceProvider->url();
	String data = sourceProvider->source().toString();
	int firstLine = sourceProvider->startPosition().m_line.oneBasedInt();

	for (auto* listener : copyToVector(listeners))
	listener->failedToParseSource(url, data, firstLine, errorLine, errorMessage);
	}

	void ScriptDebugServer::sourceParsed(ExecState* exec, SourceProvider* sourceProvider, int errorLine, const String& errorMessage)
	{
	if (m_callingListeners)
	return;

	if (m_listeners.isEmpty())
	return;

	SetForScope<bool> change(m_callingListeners, true);

	bool isError = errorLine != -1;
	if (isError)
	dispatchFailedToParseSource(m_listeners, sourceProvider, errorLine, errorMessage);
	else
	dispatchDidParseSource(m_listeners, sourceProvider, isContentScript(exec));
	}

	void ScriptDebugServer::dispatchFunctionToListeners(JavaScriptExecutionCallback callback)
	{
	if (m_callingListeners)
	return;

	if (m_listeners.isEmpty())
	return;

	SetForScope<bool> change(m_callingListeners, true);

	dispatchFunctionToListeners(m_listeners, callback);
	}

	void ScriptDebugServer::dispatchFunctionToListeners(const ListenerSet& listeners, JavaScriptExecutionCallback callback)
	{
	for (auto* listener : copyToVector(listeners))
	(this->*callback)(listener);
	}

	void ScriptDebugServer::notifyDoneProcessingDebuggerEvents()
	{
	m_doneProcessingDebuggerEvents = true;
	}

	void ScriptDebugServer::handleBreakpointHit(JSC::JSGlobalObject* globalObject, const JSC::Breakpoint& breakpoint)
	{
	ASSERT(isAttached(globalObject));

	m_currentProbeBatchId++;

	auto entry = m_breakpointIDToActions.find(breakpoint.id);
	if (entry != m_breakpointIDToActions.end()) {
	BreakpointActions actions = entry->value;
	for (size_t i = 0; i < actions.size(); ++i) {
	if (!evaluateBreakpointAction(actions[i]))
	return;
	if (!isAttached(globalObject))
	return;
	}
	}
	}

	void ScriptDebugServer::handleExceptionInBreakpointCondition(JSC::ExecState* exec, JSC::Exception* exception) const
	{
	reportException(exec, exception);
	}

	void ScriptDebugServer::handlePause(JSGlobalObject* vmEntryGlobalObject, Debugger::ReasonForPause)
	{
	dispatchFunctionToListeners(&ScriptDebugServer::dispatchDidPause);
	didPause(vmEntryGlobalObject);

	m_doneProcessingDebuggerEvents = false;
	runEventLoopWhilePaused();

	didContinue(vmEntryGlobalObject);
	dispatchFunctionToListeners(&ScriptDebugServer::dispatchDidContinue);
	}

	void ScriptDebugServer::addListener(ScriptDebugListener* listener)
	{
	ASSERT(listener);

	bool wasEmpty = m_listeners.isEmpty();
	m_listeners.add(listener);

	// First listener. Attach the debugger.
	if (wasEmpty)
	attachDebugger();
	}

	void ScriptDebugServer::removeListener(ScriptDebugListener* listener, bool isBeingDestroyed)
	{
	ASSERT(listener);

	m_listeners.remove(listener);

	// Last listener. Detach the debugger.
	if (m_listeners.isEmpty())
	detachDebugger(isBeingDestroyed);
	}

	JSC::JSValue ScriptDebugServer::exceptionOrCaughtValue(JSC::ExecState* state)
	{
	if (reasonForPause() == PausedForException)
	return currentException();

	for (RefPtr<DebuggerCallFrame> frame = &currentDebuggerCallFrame(); frame; frame = frame->callerFrame()) {
	DebuggerScope& scope = *frame->scope();
	if (scope.isCatchScope())
	return scope.caughtValue(state);
	}

	return { };
	}

	} // namespace Inspector