void ScopeChainNode::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
ScopeChainNode* thisObject = jsCast<ScopeChainNode*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
visitor.append(&thisObject->next);
visitor.append(&thisObject->object);
visitor.append(&thisObject->globalObject);
visitor.append(&thisObject->globalThis);
}
EncodedJSValue DFG_OPERATION operationResolve(ExecState* exec, Identifier* propertyName)
{
ScopeChainNode* scopeChain = exec->scopeChain();
ScopeChainIterator iter = scopeChain->begin();
ScopeChainIterator end = scopeChain->end();
ASSERT(iter != end);
do {
JSObject* record = iter->get();
PropertySlot slot(record);
if (record->getPropertySlot(exec, *propertyName, slot))
return JSValue::encode(slot.getValue(exec, *propertyName));
} while (++iter != end);
return throwVMError(exec, createUndefinedVariableError(exec, *propertyName));
}
JSValue JSJavaScriptCallFrame::scopeChain(ExecState* exec) const
{
if (!impl()->scopeChain())
return jsNull();
ScopeChainNode* scopeChain = impl()->scopeChain();
ScopeChainIterator iter = scopeChain->begin();
ScopeChainIterator end = scopeChain->end();
// we must always have something in the scope chain
ASSERT(iter != end);
MarkedArgumentBuffer list;
do {
list.append(iter->get());
++iter;
} while (iter != end);
return constructArray(exec, globalObject(), list);
}
JSValue JSJavaScriptCallFrame::scopeType(ExecState* exec)
{
if (!impl()->scopeChain())
return jsUndefined();
if (!exec->argument(0).isInt32())
return jsUndefined();
int index = exec->argument(0).asInt32();
ScopeChainNode* scopeChain = impl()->scopeChain();
ScopeChainIterator end = scopeChain->end();
bool foundLocalScope = false;
for (ScopeChainIterator iter = scopeChain->begin(); iter != end; ++iter) {
JSObject* scope = iter->get();
if (scope->isActivationObject()) {
if (!foundLocalScope) {
// First activation object is local scope, each successive activation object is closure.
if (!index)
return jsJavaScriptCallFrameLOCAL_SCOPE(exec, JSValue(), Identifier());
foundLocalScope = true;
} else if (!index)
return jsJavaScriptCallFrameCLOSURE_SCOPE(exec, JSValue(), Identifier());
}
if (!index) {
// Last in the chain is global scope.
if (++iter == end)
return jsJavaScriptCallFrameGLOBAL_SCOPE(exec, JSValue(), Identifier());
return jsJavaScriptCallFrameWITH_SCOPE(exec, JSValue(), Identifier());
}
--index;
}
return jsUndefined();
}
