/*

 * Copyright (c) 2008, 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,

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 */

#include "config.h"

#include "ScriptCallStack.h"

#include <interpreter/CallFrame.h>

#include <interpreter/Interpreter.h>

#include <runtime/JSFunction.h>

#include <runtime/JSValue.h>

#include <runtime/UString.h>

#include <runtime/JSGlobalData.h>

using namespace JSC;

namespace WebCore {

ScriptCallStack::ScriptCallStack(ExecState* exec, unsigned skipArgumentCount)

    : m_initialized(false)

    , m_exec(exec)

    , m_caller(0)

{

    int signedLineNumber;

    intptr_t sourceID;

    UString urlString;

    JSValue function;

    exec->interpreter()->retrieveLastCaller(exec, signedLineNumber, sourceID, urlString, function);

    unsigned lineNumber = signedLineNumber >= 0 ? signedLineNumber : 0;

    if (function) {

        m_caller = asFunction(function);

        m_frames.append(ScriptCallFrame(m_caller->name(m_exec), urlString, lineNumber, m_exec, skipArgumentCount));

    } else {

        // Caller is unknown, but we should still add the frame, because

        // something called us, and gave us arguments.

        m_frames.append(ScriptCallFrame(UString(), urlString, lineNumber, m_exec, skipArgumentCount));

    }

}

ScriptCallStack::~ScriptCallStack()

{

}

const ScriptCallFrame &ScriptCallStack::at(unsigned index)

{

    // First frame is pre-populated in constructor, so don't trigger

    // initialization unless looking beyond the first frame.

    if (index > 0)

        initialize();

    ASSERT(m_frames.size() > index);

    return m_frames[index];

}

unsigned ScriptCallStack::size()

{

    initialize();

    return m_frames.size();

}

void ScriptCallStack::initialize()

{

    if (!m_caller || m_initialized)

        return;

    int signedLineNumber;

    intptr_t sourceID;

    UString urlString;

    JSValue function;

    // callFrame must exist if m_caller is not null.

    CallFrame* callFrame = m_exec->callerFrame();

    while (true) {

        ASSERT(callFrame);

        m_exec->interpreter()->retrieveLastCaller(callFrame, signedLineNumber, sourceID, urlString, function);

        if (!function)

            break;

        JSFunction* jsFunction = asFunction(function);

        unsigned lineNumber = signedLineNumber >= 0 ? signedLineNumber : 0;

        m_frames.append(ScriptCallFrame(jsFunction->name(m_exec), urlString, lineNumber, m_exec, 0));

        callFrame = callFrame->callerFrame();

    }

    m_initialized = true;

}

bool ScriptCallStack::stackTrace(int, const RefPtr<InspectorArray>&)

{

    return false;

}

} // namespace WebCore