WebCore/bindings/v8/ScriptDebugServer.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 04 Oct 2010 01:32:07 +0300
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/*
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 * Copyright (c) 2010, Google Inc. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are
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 * met:
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 *
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 *     * Redistributions of source code must retain the above copyright
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 * notice, this list of conditions and the following disclaimer.
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 *     * Redistributions in binary form must reproduce the above
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 * copyright notice, this list of conditions and the following disclaimer
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 * in the documentation and/or other materials provided with the
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 * distribution.
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 *     * Neither the name of Google Inc. nor the names of its
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 * contributors may be used to endorse or promote products derived from
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 * this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include "config.h"
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#include "ScriptDebugServer.h"
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#if ENABLE(JAVASCRIPT_DEBUGGER)
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#include "Frame.h"
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#include "JavaScriptCallFrame.h"
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#include "Page.h"
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#include "ScriptDebugListener.h"
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#include "V8Binding.h"
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#include "V8DOMWindow.h"
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#include "V8Proxy.h"
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#include <wtf/StdLibExtras.h>
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namespace WebCore {
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static Frame* retrieveFrame(v8::Handle<v8::Context> context)
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{
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    if (context.IsEmpty())
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        return 0;
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    // Test that context has associated global dom window object.
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    v8::Handle<v8::Object> global = context->Global();
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    if (global.IsEmpty())
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        return 0;
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    global = V8DOMWrapper::lookupDOMWrapper(V8DOMWindow::GetTemplate(), global);
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    if (global.IsEmpty())
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        return 0;
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    return V8Proxy::retrieveFrame(context);
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}
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ScriptDebugServer& ScriptDebugServer::shared()
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{
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    DEFINE_STATIC_LOCAL(ScriptDebugServer, server, ());
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    return server;
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}
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ScriptDebugServer::ScriptDebugServer()
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    : m_pauseOnExceptionsState(DontPauseOnExceptions)
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    , m_pausedPage(0)
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    , m_enabled(true)
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{
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}
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void ScriptDebugServer::setDebuggerScriptSource(const String& scriptSource)
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{
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    m_debuggerScriptSource = scriptSource;
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}
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void ScriptDebugServer::addListener(ScriptDebugListener* listener, Page* page)
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{
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    if (!m_enabled)
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        return;
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    V8Proxy* proxy = V8Proxy::retrieve(page->mainFrame());
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    if (!proxy)
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        return;
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    v8::HandleScope scope;
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    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
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    v8::Context::Scope contextScope(debuggerContext);
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    if (!m_listenersMap.size()) {
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        ensureDebuggerScriptCompiled();
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        ASSERT(!m_debuggerScript.get()->IsUndefined());
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        v8::Debug::SetDebugEventListener2(&ScriptDebugServer::v8DebugEventCallback);
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    }
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    m_listenersMap.set(page, listener);
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    v8::Local<v8::Context> context = proxy->mainWorldContext();
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    v8::Handle<v8::Function> getScriptsFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("getScripts")));
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    v8::Handle<v8::Value> argv[] = { context->GetData() };
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    v8::Handle<v8::Value> value = getScriptsFunction->Call(m_debuggerScript.get(), 1, argv);
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    if (value.IsEmpty())
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        return;
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    ASSERT(!value->IsUndefined() && value->IsArray());
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    v8::Handle<v8::Array> scriptsArray = v8::Handle<v8::Array>::Cast(value);
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    for (unsigned i = 0; i < scriptsArray->Length(); ++i)
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        dispatchDidParseSource(listener, v8::Handle<v8::Object>::Cast(scriptsArray->Get(v8::Integer::New(i))));
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}
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   114
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void ScriptDebugServer::removeListener(ScriptDebugListener* listener, Page* page)
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{
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    if (!m_listenersMap.contains(page))
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        return;
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   119
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    if (m_pausedPage == page)
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        continueProgram();
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   122
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    m_listenersMap.remove(page);
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   124
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    if (m_listenersMap.isEmpty())
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        v8::Debug::SetDebugEventListener(0);
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    // FIXME: Remove all breakpoints set by the agent.
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}
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   129
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bool ScriptDebugServer::setBreakpoint(const String& sourceID, ScriptBreakpoint breakpoint, unsigned lineNumber, unsigned* actualLineNumber)
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{
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    v8::HandleScope scope;
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    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
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    v8::Context::Scope contextScope(debuggerContext);
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   135
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    v8::Local<v8::Object> args = v8::Object::New();
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    args->Set(v8::String::New("scriptId"), v8String(sourceID));
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   138
    args->Set(v8::String::New("lineNumber"), v8::Integer::New(lineNumber));
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   139
    args->Set(v8::String::New("condition"), v8String(breakpoint.condition));
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    args->Set(v8::String::New("enabled"), v8::Boolean::New(breakpoint.enabled));
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   141
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    v8::Handle<v8::Function> setBreakpointFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("setBreakpoint")));
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   143
    v8::Handle<v8::Value> result = v8::Debug::Call(setBreakpointFunction, args);
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   144
    if (!result->IsNumber())
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        return false;
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   146
    ASSERT(result->Int32Value() >= 0);
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   147
    *actualLineNumber = result->Int32Value();
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    return true;
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}
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   150
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void ScriptDebugServer::removeBreakpoint(const String& sourceID, unsigned lineNumber)
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{
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    v8::HandleScope scope;
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    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
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    v8::Context::Scope contextScope(debuggerContext);
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   156
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    v8::Local<v8::Object> args = v8::Object::New();
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    args->Set(v8::String::New("scriptId"), v8String(sourceID));
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   159
    args->Set(v8::String::New("lineNumber"), v8::Integer::New(lineNumber));
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   160
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    v8::Handle<v8::Function> removeBreakpointFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("removeBreakpoint")));
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   162
    v8::Debug::Call(removeBreakpointFunction, args);
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   163
}
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   164
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void ScriptDebugServer::clearBreakpoints()
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{
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   167
    ensureDebuggerScriptCompiled();
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   168
    v8::HandleScope scope;
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   169
    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
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   170
    v8::Context::Scope contextScope(debuggerContext);
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   171
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    v8::Handle<v8::Function> clearBreakpoints = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("clearBreakpoints")));
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    v8::Debug::Call(clearBreakpoints);
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   174
}
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   175
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void ScriptDebugServer::setBreakpointsActivated(bool enabled)
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{
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    ensureDebuggerScriptCompiled();
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   179
    v8::HandleScope scope;
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   180
    v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
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   181
    v8::Context::Scope contextScope(debuggerContext);
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   182
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   183
    v8::Local<v8::Object> args = v8::Object::New();
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   184
    args->Set(v8::String::New("enabled"), v8::Boolean::New(enabled));
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   185
    v8::Handle<v8::Function> setBreakpointsActivated = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("setBreakpointsActivated")));
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   186
    v8::Debug::Call(setBreakpointsActivated, args);
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   187
}
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   188
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   189
ScriptDebugServer::PauseOnExceptionsState ScriptDebugServer::pauseOnExceptionsState()
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{
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   191
    ensureDebuggerScriptCompiled();
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   192
    v8::HandleScope scope;
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   193
    v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
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   194
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   195
    v8::Handle<v8::Function> function = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("pauseOnExceptionsState")));
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   196
    v8::Handle<v8::Value> argv[] = { v8::Handle<v8::Value>() };
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   197
    v8::Handle<v8::Value> result = function->Call(m_debuggerScript.get(), 0, argv);
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   198
    return static_cast<ScriptDebugServer::PauseOnExceptionsState>(result->Int32Value());
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   199
}
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   200
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   201
void ScriptDebugServer::setPauseOnExceptionsState(PauseOnExceptionsState pauseOnExceptionsState)
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   202
{
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   203
    ensureDebuggerScriptCompiled();
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   204
    v8::HandleScope scope;
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   205
    v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
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   206
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    v8::Handle<v8::Function> setPauseOnExceptionsFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("setPauseOnExceptionsState")));
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    v8::Handle<v8::Value> argv[] = { v8::Int32::New(pauseOnExceptionsState) };
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   209
    setPauseOnExceptionsFunction->Call(m_debuggerScript.get(), 1, argv);
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   210
}
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   211
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void ScriptDebugServer::continueProgram()
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   213
{
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   214
    if (m_pausedPage)
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   215
        m_clientMessageLoop->quitNow();
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   216
    didResume();
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   217
}
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void ScriptDebugServer::stepIntoStatement()
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{
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    ASSERT(m_pausedPage);
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    v8::Handle<v8::Function> function = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("stepIntoStatement")));
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    v8::Handle<v8::Value> argv[] = { m_executionState.get() };
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    function->Call(m_debuggerScript.get(), 1, argv);
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    continueProgram();
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}
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void ScriptDebugServer::stepOverStatement()
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{
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    ASSERT(m_pausedPage);
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    v8::Handle<v8::Function> function = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("stepOverStatement")));
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    v8::Handle<v8::Value> argv[] = { m_executionState.get() };
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    function->Call(m_debuggerScript.get(), 1, argv);
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    continueProgram();
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}
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void ScriptDebugServer::stepOutOfFunction()
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{
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    ASSERT(m_pausedPage);
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    v8::Handle<v8::Function> function = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("stepOutOfFunction")));
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    v8::Handle<v8::Value> argv[] = { m_executionState.get() };
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    function->Call(m_debuggerScript.get(), 1, argv);
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    continueProgram();
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}
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bool ScriptDebugServer::editScriptSource(const String& sourceID, const String& newContent, String& newSourceOrErrorMessage)
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{
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    ensureDebuggerScriptCompiled();
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    v8::HandleScope scope;
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    OwnPtr<v8::Context::Scope> contextScope;
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    if (!m_pausedPage)
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        contextScope.set(new v8::Context::Scope(v8::Debug::GetDebugContext()));
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    v8::Handle<v8::Function> function = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("editScriptSource")));
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    v8::Handle<v8::Value> argv[] = { v8String(sourceID), v8String(newContent) };
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    v8::TryCatch tryCatch;
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    tryCatch.SetVerbose(false);
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    v8::Handle<v8::Value> result = function->Call(m_debuggerScript.get(), 2, argv);
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    if (tryCatch.HasCaught()) {
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        v8::Local<v8::Message> message = tryCatch.Message();
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        if (!message.IsEmpty())
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            newSourceOrErrorMessage = toWebCoreStringWithNullOrUndefinedCheck(message->Get());
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        return false;
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    }
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    ASSERT(!result.IsEmpty());
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    newSourceOrErrorMessage = toWebCoreStringWithNullOrUndefinedCheck(result);
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    // Call stack may have changed after if the edited function was on the stack.
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    if (m_currentCallFrame)
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        m_currentCallFrame.clear();
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    return true;
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}
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PassRefPtr<JavaScriptCallFrame> ScriptDebugServer::currentCallFrame()
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{
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    if (!m_currentCallFrame) {
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        v8::Handle<v8::Function> currentCallFrameFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("currentCallFrame")));
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        v8::Handle<v8::Value> argv[] = { m_executionState.get() };
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        v8::Handle<v8::Value> currentCallFrameV8 = currentCallFrameFunction->Call(m_debuggerScript.get(), 1, argv);
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        m_currentCallFrame = JavaScriptCallFrame::create(v8::Debug::GetDebugContext(), v8::Handle<v8::Object>::Cast(currentCallFrameV8));
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    }
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    return m_currentCallFrame;
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}
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void ScriptDebugServer::setEnabled(bool value)
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{
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     m_enabled = value;
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}
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bool ScriptDebugServer::isDebuggerAlwaysEnabled()
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{
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    return m_enabled;
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}
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void ScriptDebugServer::v8DebugEventCallback(const v8::Debug::EventDetails& eventDetails)
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{
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    ScriptDebugServer::shared().handleV8DebugEvent(eventDetails);
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}
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void ScriptDebugServer::handleV8DebugEvent(const v8::Debug::EventDetails& eventDetails)
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{
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    v8::DebugEvent event = eventDetails.GetEvent();
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    if (event != v8::Break && event != v8::Exception && event != v8::AfterCompile)
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        return;
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    v8::Handle<v8::Context> eventContext = eventDetails.GetEventContext();
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    ASSERT(!eventContext.IsEmpty());
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    Frame* frame = retrieveFrame(eventContext);
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    if (frame) {
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        ScriptDebugListener* listener = m_listenersMap.get(frame->page());
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        if (listener) {
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            v8::HandleScope scope;
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            if (event == v8::AfterCompile) {
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                v8::Context::Scope contextScope(v8::Debug::GetDebugContext());
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                v8::Handle<v8::Function> onAfterCompileFunction = v8::Local<v8::Function>::Cast(m_debuggerScript.get()->Get(v8::String::New("getAfterCompileScript")));
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                v8::Handle<v8::Value> argv[] = { eventDetails.GetEventData() };
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                v8::Handle<v8::Value> value = onAfterCompileFunction->Call(m_debuggerScript.get(), 1, argv);
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                ASSERT(value->IsObject());
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                v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(value);
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                dispatchDidParseSource(listener, object);
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            } else if (event == v8::Break || event == v8::Exception) {
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                if (event == v8::Exception) {
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                    v8::Local<v8::StackTrace> stackTrace = v8::StackTrace::CurrentStackTrace(1);
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                    // Stack trace is empty in case of syntax error. Silently continue execution in such cases.
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                    if (!stackTrace->GetFrameCount())
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                        return;
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                }
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   331
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                // Don't allow nested breaks.
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                if (m_pausedPage)
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                    return;
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                m_executionState.set(eventDetails.GetExecutionState());
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                m_pausedPage = frame->page();
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                ScriptState* currentCallFrameState = mainWorldScriptState(frame);
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                listener->didPause(currentCallFrameState);
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                // Wait for continue or step command.
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                m_clientMessageLoop->run(m_pausedPage);
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                ASSERT(!m_pausedPage);
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                // The listener may have been removed in the nested loop.
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                if (ScriptDebugListener* listener = m_listenersMap.get(frame->page()))
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                    listener->didContinue();
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            }
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        }
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    }
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}
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   351
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void ScriptDebugServer::dispatchDidParseSource(ScriptDebugListener* listener, v8::Handle<v8::Object> object)
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{
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    listener->didParseSource(
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        toWebCoreStringWithNullOrUndefinedCheck(object->Get(v8::String::New("id"))),
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        toWebCoreStringWithNullOrUndefinedCheck(object->Get(v8::String::New("name"))),
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        toWebCoreStringWithNullOrUndefinedCheck(object->Get(v8::String::New("source"))),
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        object->Get(v8::String::New("lineOffset"))->ToInteger()->Value(),
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        static_cast<ScriptWorldType>(object->Get(v8::String::New("scriptWorldType"))->Int32Value()));
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}
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   361
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void ScriptDebugServer::ensureDebuggerScriptCompiled()
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{
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    if (m_debuggerScript.get().IsEmpty()) {
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        v8::HandleScope scope;
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        v8::Local<v8::Context> debuggerContext = v8::Debug::GetDebugContext();
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        v8::Context::Scope contextScope(debuggerContext);
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        m_debuggerScript.set(v8::Handle<v8::Object>::Cast(v8::Script::Compile(v8String(m_debuggerScriptSource))->Run()));
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    }
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}
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void ScriptDebugServer::didResume()
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{
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    m_currentCallFrame.clear();
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    m_executionState.clear();
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    m_pausedPage = 0;
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}
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} // namespace WebCore
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#endif // ENABLE(JAVASCRIPT_DEBUGGER)