static JSBool
args_resolve(JSContext *cx, HandleObject obj, HandleId id, unsigned flags,
MutableHandleObject objp)
{
objp.set(NULL);
Rooted<NormalArgumentsObject*> argsobj(cx, &obj->asNormalArguments());
unsigned attrs = JSPROP_SHARED | JSPROP_SHADOWABLE;
if (JSID_IS_INT(id)) {
uint32_t arg = uint32_t(JSID_TO_INT(id));
if (arg >= argsobj->initialLength() || argsobj->isElementDeleted(arg))
return true;
attrs |= JSPROP_ENUMERATE;
} else if (JSID_IS_ATOM(id, cx->names().length)) {
if (argsobj->hasOverriddenLength())
return true;
} else {
if (!JSID_IS_ATOM(id, cx->names().callee))
return true;
if (argsobj->callee().isMagic(JS_OVERWRITTEN_CALLEE))
return true;
}
RootedValue undef(cx, UndefinedValue());
if (!baseops::DefineGeneric(cx, argsobj, id, undef, ArgGetter, ArgSetter, attrs))
return JS_FALSE;
objp.set(argsobj);
return true;
}
static JSBool
args_enumerate(JSContext *cx, HandleObject obj)
{
Rooted<NormalArgumentsObject*> argsobj(cx, &obj->asNormalArguments());
RootedId id(cx);
/*
* Trigger reflection in args_resolve using a series of js_LookupProperty
* calls.
*/
int argc = int(argsobj->initialLength());
for (int i = -2; i != argc; i++) {
id = (i == -2)
? NameToId(cx->names().length)
: (i == -1)
? NameToId(cx->names().callee)
: INT_TO_JSID(i);
RootedObject pobj(cx);
RootedShape prop(cx);
if (!baseops::LookupProperty(cx, argsobj, id, &pobj, &prop))
return false;
}
return true;
}
static JSBool
ArgGetter(JSContext *cx, HandleObject obj, HandleId id, MutableHandleValue vp)
{
if (!obj->isNormalArguments())
return true;
NormalArgumentsObject &argsobj = obj->asNormalArguments();
if (JSID_IS_INT(id)) {
/*
* arg can exceed the number of arguments if a script changed the
* prototype to point to another Arguments object with a bigger argc.
*/
unsigned arg = unsigned(JSID_TO_INT(id));
if (arg < argsobj.initialLength() && !argsobj.isElementDeleted(arg))
vp.set(argsobj.element(arg));
} else if (JSID_IS_ATOM(id, cx->names().length)) {
if (!argsobj.hasOverriddenLength())
vp.setInt32(argsobj.initialLength());
} else {
JS_ASSERT(JSID_IS_ATOM(id, cx->names().callee));
if (!argsobj.callee().isMagic(JS_OVERWRITTEN_CALLEE))
vp.set(argsobj.callee());
}
return true;
}
static JSBool
args_resolve(JSContext *cx, HandleObject obj, HandleId id, unsigned flags,
JSObject **objp)
{
*objp = NULL;
Rooted<NormalArgumentsObject*> argsobj(cx, &obj->asNormalArguments());
unsigned attrs = JSPROP_SHARED | JSPROP_SHADOWABLE;
if (JSID_IS_INT(id)) {
uint32_t arg = uint32_t(JSID_TO_INT(id));
if (arg >= argsobj->initialLength() || argsobj->isElementDeleted(arg))
return true;
attrs |= JSPROP_ENUMERATE;
} else if (JSID_IS_ATOM(id, cx->runtime->atomState.lengthAtom)) {
if (argsobj->hasOverriddenLength())
return true;
} else {
if (!JSID_IS_ATOM(id, cx->runtime->atomState.calleeAtom))
return true;
if (argsobj->callee().isMagic(JS_OVERWRITTEN_CALLEE))
return true;
}
Value undef = UndefinedValue();
if (!baseops::DefineProperty(cx, argsobj, id, &undef, ArgGetter, ArgSetter, attrs))
return JS_FALSE;
*objp = argsobj;
return true;
}
static JSBool
ArgGetter(JSContext *cx, HandleObject obj, HandleId id, Value *vp)
{
if (!obj->isNormalArguments())
return true;
NormalArgumentsObject &argsobj = obj->asNormalArguments();
if (JSID_IS_INT(id)) {
/*
* arg can exceed the number of arguments if a script changed the
* prototype to point to another Arguments object with a bigger argc.
*/
unsigned arg = unsigned(JSID_TO_INT(id));
if (arg < argsobj.initialLength() && !argsobj.isElementDeleted(arg)) {
if (StackFrame *fp = argsobj.maybeStackFrame()) {
JS_ASSERT_IF(arg < fp->numFormalArgs(), fp->script()->formalIsAliased(arg));
*vp = fp->canonicalActualArg(arg);
} else {
*vp = argsobj.element(arg);
}
}
} else if (JSID_IS_ATOM(id, cx->runtime->atomState.lengthAtom)) {
if (!argsobj.hasOverriddenLength())
vp->setInt32(argsobj.initialLength());
} else {
JS_ASSERT(JSID_IS_ATOM(id, cx->runtime->atomState.calleeAtom));
const Value &v = argsobj.callee();
if (!v.isMagic(JS_OVERWRITTEN_CALLEE))
*vp = v;
}
return true;
}
static JSBool
ArgSetter(JSContext *cx, HandleObject obj, HandleId id, JSBool strict, MutableHandleValue vp)
{
if (!obj->isNormalArguments())
return true;
unsigned attrs;
if (!baseops::GetAttributes(cx, obj, id, &attrs))
return false;
JS_ASSERT(!(attrs & JSPROP_READONLY));
attrs &= (JSPROP_ENUMERATE | JSPROP_PERMANENT); /* only valid attributes */
NormalArgumentsObject &argsobj = obj->asNormalArguments();
RootedScript script(cx, argsobj.containingScript());
if (JSID_IS_INT(id)) {
unsigned arg = unsigned(JSID_TO_INT(id));
if (arg < argsobj.initialLength() && !argsobj.isElementDeleted(arg)) {
argsobj.setElement(arg, vp);
if (arg < script->function()->nargs) {
if (!script->ensureHasTypes(cx))
return false;
types::TypeScript::SetArgument(cx, script, arg, vp);
}
return true;
}
} else {
JS_ASSERT(JSID_IS_ATOM(id, cx->names().length) || JSID_IS_ATOM(id, cx->names().callee));
}
/*
* For simplicity we use delete/define to replace the property with one
* backed by the default Object getter and setter. Note that we rely on
* args_delProperty to clear the corresponding reserved slot so the GC can
* collect its value. Note also that we must define the property instead
* of setting it in case the user has changed the prototype to an object
* that has a setter for this id.
*/
RootedValue value(cx);
return baseops::DeleteGeneric(cx, obj, id, &value, false) &&
baseops::DefineGeneric(cx, obj, id, vp, NULL, NULL, attrs);
}
static JSBool
ArgSetter(JSContext *cx, HandleObject obj, HandleId id, JSBool strict, Value *vp)
{
if (!obj->isNormalArguments())
return true;
NormalArgumentsObject &argsobj = obj->asNormalArguments();
if (JSID_IS_INT(id)) {
unsigned arg = unsigned(JSID_TO_INT(id));
if (arg < argsobj.initialLength()) {
if (StackFrame *fp = argsobj.maybeStackFrame()) {
JSScript *script = fp->functionScript();
JS_ASSERT(script->needsArgsObj());
if (arg < fp->numFormalArgs()) {
JS_ASSERT(fp->script()->formalIsAliased(arg));
types::TypeScript::SetArgument(cx, script, arg, *vp);
}
fp->canonicalActualArg(arg) = *vp;
return true;
}
}
} else {
JS_ASSERT(JSID_IS_ATOM(id, cx->runtime->atomState.lengthAtom) ||
JSID_IS_ATOM(id, cx->runtime->atomState.calleeAtom));
}
/*
* For simplicity we use delete/define to replace the property with one
* backed by the default Object getter and setter. Note that we rely on
* args_delProperty to clear the corresponding reserved slot so the GC can
* collect its value. Note also that we must define the property instead
* of setting it in case the user has changed the prototype to an object
* that has a setter for this id.
*/
RootedVarValue value(cx);
return baseops::DeleteGeneric(cx, obj, id, value.address(), false) &&
baseops::DefineProperty(cx, obj, id, vp, NULL, NULL, JSPROP_ENUMERATE);
}