Source/WebCore/bindings/js/ScriptCallStackFactory.cpp

/*
 * Copyright (c) 2010 Google Inc. All rights reserved.
 * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * 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
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#include "config.h"
#include "ScriptCallStackFactory.h"

#include "InspectorInstrumentation.h"
#include "JSDOMBinding.h"
#include "JSMainThreadExecState.h"
#include "ScriptArguments.h"
#include "ScriptCallFrame.h"
#include "ScriptCallStack.h"
#include "ScriptValue.h"
#include <interpreter/CallFrame.h>
#include <interpreter/Interpreter.h>
#include <runtime/ArgList.h>
#include <runtime/JSFunction.h>
#include <runtime/JSGlobalData.h>
#include <runtime/JSValue.h>
#include <runtime/UString.h>

using namespace JSC;

namespace WebCore {

class ScriptExecutionContext;

PassRefPtr<ScriptCallStack> createScriptCallStack(size_t maxStackSize, bool emptyIsAllowed)
{
    Vector<ScriptCallFrame> frames;
    if (JSC::ExecState* exec = JSMainThreadExecState::currentState()) {
        Vector<StackFrame> stackTrace;
        Interpreter::getStackTrace(&exec->globalData(), stackTrace);
        for (Vector<StackFrame>::const_iterator iter = stackTrace.begin(); iter < stackTrace.end(); iter++) {
            frames.append(ScriptCallFrame(iter->friendlyFunctionName(exec), iter->friendlySourceURL(), iter->friendlyLineNumber()));
            if (frames.size() >= maxStackSize)
                break;
        }
    }
    if (frames.isEmpty() && !emptyIsAllowed) {
        // No frames found. It may happen in the case where
        // a bound function is called from native code for example.
        // Fallback to setting lineNumber to 0, and source and function name to "undefined".
        frames.append(ScriptCallFrame("undefined", "undefined", 0));
    }
    return ScriptCallStack::create(frames);
}

PassRefPtr<ScriptCallStack> createScriptCallStack(JSC::ExecState* exec, size_t maxStackSize)
{
    Vector<ScriptCallFrame> frames;
    CallFrame* callFrame = exec;
    while (true) {
        ASSERT(callFrame);
        int signedLineNumber;
        intptr_t sourceID;
        UString urlString;
        JSValue function;

        exec->interpreter()->retrieveLastCaller(callFrame, signedLineNumber, sourceID, urlString, function);
        UString functionName;
        if (function)
            functionName = jsCast<JSFunction*>(function)->name(exec);
        else {
            // Caller is unknown, but if frames is empty we should still add the frame, because
            // something called us, and gave us arguments.
            if (!frames.isEmpty())
                break;
        }
        unsigned lineNumber = signedLineNumber >= 0 ? signedLineNumber : 0;
        frames.append(ScriptCallFrame(ustringToString(functionName), ustringToString(urlString), lineNumber));
        if (!function || frames.size() == maxStackSize)
            break;
        callFrame = callFrame->callerFrame();
    }
    return ScriptCallStack::create(frames);
}

PassRefPtr<ScriptCallStack> createScriptCallStackForInspector(JSC::ExecState* exec)
{
    size_t maxStackSize = 1;
    if (InspectorInstrumentation::hasFrontends()) {
        ScriptExecutionContext* scriptExecutionContext = jsCast<JSDOMGlobalObject*>(exec->lexicalGlobalObject())->scriptExecutionContext();
        if (InspectorInstrumentation::hasFrontendForScriptContext(scriptExecutionContext))
            maxStackSize = ScriptCallStack::maxCallStackSizeToCapture;
    }
    return createScriptCallStack(exec, maxStackSize);
}

PassRefPtr<ScriptArguments> createScriptArguments(JSC::ExecState* exec, unsigned skipArgumentCount)
{
    Vector<ScriptValue> arguments;
    size_t argumentCount = exec->argumentCount();
    for (size_t i = skipArgumentCount; i < argumentCount; ++i)
        arguments.append(ScriptValue(exec->globalData(), exec->argument(i)));
    return ScriptArguments::create(exec, arguments);
}

} // namespace WebCore