/*!
Returns the arguments object of this QScriptContext.
The arguments object has properties \c callee (equal to callee())
and \c length (equal to argumentCount()), and properties \c 0, \c 1,
..., argumentCount() - 1 that provide access to the argument
values. Initially, property \c P (0 <= \c P < argumentCount()) has
the same value as argument(\c P). In the case when \c P is less
than the number of formal parameters of the function, \c P shares
its value with the corresponding property of the activation object
(activationObject()). This means that changing this property changes
the corresponding property of the activation object and vice versa.
\sa argument(), activationObject()
*/
QScriptValue QScriptContext::argumentsObject() const
{
JSC::CallFrame *frame = const_cast<JSC::ExecState*>(QScriptEnginePrivate::frameForContext(this));
QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
if (frame == frame->lexicalGlobalObject()->globalExec()) {
// <global> context doesn't have arguments. return an empty object
return QScriptEnginePrivate::get(QScript::scriptEngineFromExec(frame))->newObject();
}
//for a js function
if (frame->codeBlock() && frame->callee()) {
if (!QScriptEnginePrivate::hasValidCodeBlockRegister(frame)) {
// We have a built-in JS host call.
// codeBlock is needed by retrieveArguments(), but since it
// contains junk, we would crash. Return an invalid value for now.
return QScriptValue();
}
JSC::JSValue result = frame->interpreter()->retrieveArguments(frame, JSC::asFunction(frame->callee()));
return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(result);
}
if (frame->callerFrame()->hasHostCallFrameFlag()) {
// <eval> context doesn't have arguments. return an empty object
return QScriptEnginePrivate::get(QScript::scriptEngineFromExec(frame))->newObject();
}
//for a native function
if (!frame->optionalCalleeArguments()
&& QScriptEnginePrivate::hasValidCodeBlockRegister(frame)) { // Make sure we don't go here for host JSFunctions
Q_ASSERT(frame->argumentCount() > 0); //we need at least 'this' otherwise we'll crash later
JSC::Arguments* arguments = new (&frame->globalData())JSC::Arguments(frame, JSC::Arguments::NoParameters);
frame->setCalleeArguments(arguments);
}
return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(frame->optionalCalleeArguments());
}
/*!
\internal
*/
QScriptContextInfoPrivate::QScriptContextInfoPrivate(const QScriptContext *context)
{
Q_ASSERT(context);
functionType = QScriptContextInfo::NativeFunction;
functionMetaIndex = -1;
functionStartLineNumber = -1;
functionEndLineNumber = -1;
scriptId = -1;
lineNumber = -1;
columnNumber = -1;
JSC::CallFrame *frame = const_cast<JSC::CallFrame *>(QScriptEnginePrivate::frameForContext(context));
// Get the line number:
//We need to know the context directly up in the backtrace, in order to get the line number, and adjust the global context
JSC::CallFrame *rewindContext = QScriptEnginePrivate::get(context->engine())->currentFrame;
if (QScriptEnginePrivate::contextForFrame(rewindContext) == context) { //top context
frame = rewindContext; //for retreiving the global context's "fake" frame
// An agent might have provided the line number.
lineNumber = QScript::scriptEngineFromExec(frame)->agentLineNumber;
if (lineNumber == -1)
lineNumber = QScript::scriptEngineFromExec(frame)->uncaughtExceptionLineNumber;
} else {
// rewind the stack from the top in order to find the frame from the caller where the returnPC is stored
while (rewindContext && QScriptEnginePrivate::contextForFrame(rewindContext->callerFrame()->removeHostCallFrameFlag()) != context)
rewindContext = rewindContext->callerFrame()->removeHostCallFrameFlag();
if (rewindContext) {
frame = rewindContext->callerFrame()->removeHostCallFrameFlag(); //for retreiving the global context's "fake" frame
JSC::Instruction *returnPC = rewindContext->returnPC();
JSC::CodeBlock *codeBlock = frame->codeBlock();
if (returnPC && codeBlock && QScriptEnginePrivate::hasValidCodeBlockRegister(frame)) {
#if ENABLE(JIT)
JSC::JITCode code = codeBlock->getJITCode();
uintptr_t jitOffset = reinterpret_cast<uintptr_t>(JSC::ReturnAddressPtr(returnPC).value()) - reinterpret_cast<uintptr_t>(code.addressForCall().executableAddress());
// We can only use the JIT code offset if it's smaller than the JIT size;
// otherwise calling getBytecodeIndex() is meaningless.
if (jitOffset < code.size()) {
unsigned bytecodeOffset = codeBlock->getBytecodeIndex(frame, JSC::ReturnAddressPtr(returnPC));
#else
unsigned bytecodeOffset = returnPC - codeBlock->instructions().begin();
#endif
bytecodeOffset--; //because returnPC is on the next instruction. We want the current one
lineNumber = codeBlock->lineNumberForBytecodeOffset(const_cast<JSC::ExecState *>(frame), bytecodeOffset);
#if ENABLE(JIT)
}
#endif
}
}
}
// Get the filename and the scriptId:
JSC::CodeBlock *codeBlock = frame->codeBlock();
if (codeBlock && QScriptEnginePrivate::hasValidCodeBlockRegister(frame)) {
JSC::SourceProvider *source = codeBlock->source();
scriptId = source->asID();
fileName = source->url();
}
// Get the others information:
JSC::JSObject *callee = frame->callee();
if (callee && callee->inherits(&JSC::InternalFunction::info))
functionName = JSC::asInternalFunction(callee)->name(frame);
if (callee && callee->inherits(&JSC::JSFunction::info)
&& !JSC::asFunction(callee)->isHostFunction()) {
functionType = QScriptContextInfo::ScriptFunction;
JSC::FunctionExecutable *body = JSC::asFunction(callee)->jsExecutable();
functionStartLineNumber = body->lineNo();
functionEndLineNumber = body->lastLine();
for (size_t i = 0; i < body->parameterCount(); ++i)
parameterNames.append(body->parameterName(i));
// ### get the function name from the AST
} else if (callee && callee->inherits(&QScript::QtFunction::info)) {
functionType = QScriptContextInfo::QtFunction;
functionMetaIndex = static_cast<QScript::QtFunction*>(callee)->specificIndex(context);
const QMetaObject *meta = static_cast<QScript::QtFunction*>(callee)->metaObject();
if (meta != 0) {
QMetaMethod method = meta->method(functionMetaIndex);
QList<QByteArray> formals = method.parameterNames();
for (int i = 0; i < formals.count(); ++i)
parameterNames.append(QLatin1String(formals.at(i)));
}
}
else if (callee && callee->inherits(&QScript::QtPropertyFunction::info)) {
functionType = QScriptContextInfo::QtPropertyFunction;
functionMetaIndex = static_cast<QScript::QtPropertyFunction*>(callee)->propertyIndex();
}
}