Source/WebCore/bindings/js/ScriptCallStackFactory.cpp

/*
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 * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
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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/JSCJSValue.h>
#include <runtime/JSFunction.h>
#include <runtime/VM.h>
#include <wtf/text/WTFString.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->vm(), stackTrace, maxStackSize);
        for (size_t i = 0; i < stackTrace.size(); i++) {
            unsigned line;
            unsigned column;
            stackTrace[i].computeLineAndColumn(line, column);
            frames.append(ScriptCallFrame(stackTrace[i].friendlyFunctionName(exec), stackTrace[i].friendlySourceURL(), line, column));
        }
    }
    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, 0));
    }
    return ScriptCallStack::create(frames);
}

PassRefPtr<ScriptCallStack> createScriptCallStack(JSC::ExecState* exec, size_t maxStackSize)
{
    Vector<ScriptCallFrame> frames;
    Vector<StackFrame> stackTrace;
    Interpreter::getStackTrace(&exec->vm(), stackTrace, maxStackSize + 1);
    for (size_t i = stackTrace.size() == 1 ? 0 : 1; i < stackTrace.size(); i++) {
        // This early exit is necessary to maintain our old behaviour
        // but the stack trace we produce now is complete and handles all
        // ways in which code may be running
        if (!stackTrace[i].callee && frames.size())
            break;

        String functionName = stackTrace[i].friendlyFunctionName(exec);
        unsigned line;
        unsigned column;
        stackTrace[i].computeLineAndColumn(line, column);
        frames.append(ScriptCallFrame(functionName, stackTrace[i].sourceURL, line, column));
    }

    return ScriptCallStack::create(frames);
}

PassRefPtr<ScriptCallStack> createScriptCallStackFromException(JSC::ExecState* exec, JSC::JSValue& exception, size_t maxStackSize)
{
    Vector<ScriptCallFrame> frames;
    RefCountedArray<StackFrame> stackTrace = exec->vm().exceptionStack();
    for (size_t i = 0; i < stackTrace.size() && i < maxStackSize; i++) {
        if (!stackTrace[i].callee && frames.size())
            break;

        String functionName = stackTrace[i].friendlyFunctionName(exec);
        unsigned line;
        unsigned column;
        stackTrace[i].computeLineAndColumn(line, column);
        frames.append(ScriptCallFrame(functionName, stackTrace[i].sourceURL, line, column));
    }

    // FIXME: <http://webkit.org/b/115087> Web Inspector: WebCore::reportException should not evaluate JavaScript handling exceptions
    // Fallback to getting at least the line and sourceURL from the exception if it has values and the exceptionStack doesn't.
    if (frames.size() > 0) {
        const ScriptCallFrame& firstCallFrame = frames.first();
        JSObject* exceptionObject = exception.toObject(exec);
        if (exception.isObject() && firstCallFrame.sourceURL().isEmpty()) {
            JSValue lineValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "line"));
            int lineNumber = lineValue && lineValue.isNumber() ? int(lineValue.toNumber(exec)) : 0;
            JSValue sourceURLValue = exceptionObject->getDirect(exec->vm(), Identifier(exec, "sourceURL"));
            String exceptionSourceURL = sourceURLValue && sourceURLValue.isString() ? sourceURLValue.toString(exec)->value(exec) : ASCIILiteral("undefined");
            frames[0] = ScriptCallFrame(firstCallFrame.functionName(), exceptionSourceURL, lineNumber, 0);
        }
    }

    return ScriptCallStack::create(frames);
}

PassRefPtr<ScriptCallStack> createScriptCallStackForConsole(JSC::ExecState* exec)
{
    size_t maxStackSize = 1;
    if (InspectorInstrumentation::hasFrontends()) {
        ScriptExecutionContext* scriptExecutionContext = jsCast<JSDOMGlobalObject*>(exec->lexicalGlobalObject())->scriptExecutionContext();
        if (InspectorInstrumentation::consoleAgentEnabled(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->vm(), exec->argument(i)));
    return ScriptArguments::create(exec, arguments);
}

} // namespace WebCore