mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-05 03:54:35 +00:00
a22f746363
--HG-- rename : dom/bindings/BindingUtils.h => dom/bindings/RootedDictionary.h
2254 lines
67 KiB
C++
2254 lines
67 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* vim: set ts=2 sw=2 et tw=79: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_BindingUtils_h__
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#define mozilla_dom_BindingUtils_h__
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#include "jsfriendapi.h"
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#include "jswrapper.h"
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#include "mozilla/Alignment.h"
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#include "mozilla/dom/BindingDeclarations.h"
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#include "mozilla/dom/CallbackObject.h"
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#include "mozilla/dom/DOMJSClass.h"
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#include "mozilla/dom/DOMJSProxyHandler.h"
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#include "mozilla/dom/Exceptions.h"
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#include "mozilla/dom/NonRefcountedDOMObject.h"
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#include "mozilla/dom/Nullable.h"
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#include "mozilla/dom/RootedDictionary.h"
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#include "mozilla/dom/workers/Workers.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/Likely.h"
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#include "mozilla/Util.h"
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#include "nsCycleCollector.h"
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#include "nsIXPConnect.h"
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#include "MainThreadUtils.h"
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#include "nsTraceRefcnt.h"
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#include "qsObjectHelper.h"
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#include "xpcpublic.h"
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#include "nsIVariant.h"
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#include "nsWrapperCacheInlines.h"
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class nsPIDOMWindow;
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extern nsresult
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xpc_qsUnwrapArgImpl(JSContext* cx, jsval v, const nsIID& iid, void** ppArg,
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nsISupports** ppArgRef, jsval* vp);
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namespace mozilla {
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namespace dom {
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struct SelfRef
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{
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SelfRef() : ptr(nullptr) {}
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explicit SelfRef(nsISupports *p) : ptr(p) {}
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~SelfRef() { NS_IF_RELEASE(ptr); }
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nsISupports* ptr;
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};
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/** Convert a jsval to an XPCOM pointer. */
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template <class Interface, class StrongRefType>
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inline nsresult
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UnwrapArg(JSContext* cx, jsval v, Interface** ppArg,
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StrongRefType** ppArgRef, jsval* vp)
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{
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nsISupports* argRef = *ppArgRef;
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nsresult rv = xpc_qsUnwrapArgImpl(cx, v, NS_GET_TEMPLATE_IID(Interface),
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reinterpret_cast<void**>(ppArg), &argRef,
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vp);
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*ppArgRef = static_cast<StrongRefType*>(argRef);
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return rv;
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}
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bool
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ThrowInvalidThis(JSContext* aCx, const JS::CallArgs& aArgs,
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const ErrNum aErrorNumber,
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const char* aInterfaceName);
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inline bool
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ThrowMethodFailedWithDetails(JSContext* cx, ErrorResult& rv,
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const char* ifaceName,
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const char* memberName,
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bool reportJSContentExceptions = false)
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{
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if (rv.IsTypeError()) {
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rv.ReportTypeError(cx);
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return false;
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}
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if (rv.IsJSException()) {
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if (reportJSContentExceptions) {
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rv.ReportJSExceptionFromJSImplementation(cx);
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} else {
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rv.ReportJSException(cx);
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}
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return false;
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}
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if (rv.IsNotEnoughArgsError()) {
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rv.ReportNotEnoughArgsError(cx, ifaceName, memberName);
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}
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return Throw(cx, rv.ErrorCode());
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}
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// Returns true if the JSClass is used for DOM objects.
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inline bool
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IsDOMClass(const JSClass* clasp)
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{
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return clasp->flags & JSCLASS_IS_DOMJSCLASS;
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}
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inline bool
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IsDOMClass(const js::Class* clasp)
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{
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return IsDOMClass(Jsvalify(clasp));
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}
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// Returns true if the JSClass is used for DOM interface and interface
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// prototype objects.
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inline bool
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IsDOMIfaceAndProtoClass(const JSClass* clasp)
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{
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return clasp->flags & JSCLASS_IS_DOMIFACEANDPROTOJSCLASS;
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}
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inline bool
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IsDOMIfaceAndProtoClass(const js::Class* clasp)
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{
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return IsDOMIfaceAndProtoClass(Jsvalify(clasp));
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}
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static_assert(DOM_OBJECT_SLOT == js::PROXY_PRIVATE_SLOT,
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"js::PROXY_PRIVATE_SLOT doesn't match DOM_OBJECT_SLOT. "
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"Expect bad things");
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template <class T>
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inline T*
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UnwrapDOMObject(JSObject* obj)
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{
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MOZ_ASSERT(IsDOMClass(js::GetObjectClass(obj)) || IsDOMProxy(obj),
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"Don't pass non-DOM objects to this function");
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JS::Value val = js::GetReservedSlot(obj, DOM_OBJECT_SLOT);
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return static_cast<T*>(val.toPrivate());
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}
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inline const DOMClass*
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GetDOMClass(JSObject* obj)
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{
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const js::Class* clasp = js::GetObjectClass(obj);
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if (IsDOMClass(clasp)) {
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return &DOMJSClass::FromJSClass(clasp)->mClass;
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}
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if (js::IsProxyClass(clasp)) {
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js::BaseProxyHandler* handler = js::GetProxyHandler(obj);
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if (handler->family() == ProxyFamily()) {
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return &static_cast<DOMProxyHandler*>(handler)->mClass;
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}
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}
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return nullptr;
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}
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inline nsISupports*
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UnwrapDOMObjectToISupports(JSObject* aObject)
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{
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const DOMClass* clasp = GetDOMClass(aObject);
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if (!clasp || !clasp->mDOMObjectIsISupports) {
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return nullptr;
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}
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return UnwrapDOMObject<nsISupports>(aObject);
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}
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inline bool
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IsDOMObject(JSObject* obj)
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{
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const js::Class* clasp = js::GetObjectClass(obj);
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return IsDOMClass(clasp) || IsDOMProxy(obj, clasp);
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}
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#define UNWRAP_OBJECT(Interface, cx, obj, value) \
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mozilla::dom::UnwrapObject<mozilla::dom::prototypes::id::Interface, \
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mozilla::dom::Interface##Binding::NativeType>(cx, obj, value)
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// Some callers don't want to set an exception when unwrapping fails
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// (for example, overload resolution uses unwrapping to tell what sort
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// of thing it's looking at).
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// U must be something that a T* can be assigned to (e.g. T* or an nsRefPtr<T>).
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template <prototypes::ID PrototypeID, class T, typename U>
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MOZ_ALWAYS_INLINE nsresult
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UnwrapObject(JSContext* cx, JSObject* obj, U& value)
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{
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/* First check to see whether we have a DOM object */
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const DOMClass* domClass = GetDOMClass(obj);
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if (!domClass) {
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/* Maybe we have a security wrapper or outer window? */
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if (!js::IsWrapper(obj)) {
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/* Not a DOM object, not a wrapper, just bail */
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return NS_ERROR_XPC_BAD_CONVERT_JS;
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}
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obj = js::CheckedUnwrap(obj, /* stopAtOuter = */ false);
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if (!obj) {
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return NS_ERROR_XPC_SECURITY_MANAGER_VETO;
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}
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MOZ_ASSERT(!js::IsWrapper(obj));
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domClass = GetDOMClass(obj);
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if (!domClass) {
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/* We don't have a DOM object */
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return NS_ERROR_XPC_BAD_CONVERT_JS;
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}
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}
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/* This object is a DOM object. Double-check that it is safely
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castable to T by checking whether it claims to inherit from the
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class identified by protoID. */
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if (domClass->mInterfaceChain[PrototypeTraits<PrototypeID>::Depth] ==
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PrototypeID) {
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value = UnwrapDOMObject<T>(obj);
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return NS_OK;
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}
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/* It's the wrong sort of DOM object */
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return NS_ERROR_XPC_BAD_CONVERT_JS;
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}
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inline bool
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IsNotDateOrRegExp(JSContext* cx, JS::Handle<JSObject*> obj)
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{
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MOZ_ASSERT(obj);
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return !JS_ObjectIsDate(cx, obj) && !JS_ObjectIsRegExp(cx, obj);
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}
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MOZ_ALWAYS_INLINE bool
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IsArrayLike(JSContext* cx, JS::Handle<JSObject*> obj)
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{
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return IsNotDateOrRegExp(cx, obj);
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}
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MOZ_ALWAYS_INLINE bool
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IsObjectValueConvertibleToDictionary(JSContext* cx,
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JS::Handle<JS::Value> objVal)
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{
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JS::Rooted<JSObject*> obj(cx, &objVal.toObject());
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return IsNotDateOrRegExp(cx, obj);
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}
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MOZ_ALWAYS_INLINE bool
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IsConvertibleToDictionary(JSContext* cx, JS::Handle<JS::Value> val)
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{
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return val.isNullOrUndefined() ||
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(val.isObject() && IsObjectValueConvertibleToDictionary(cx, val));
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}
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MOZ_ALWAYS_INLINE bool
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IsConvertibleToCallbackInterface(JSContext* cx, JS::Handle<JSObject*> obj)
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{
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return IsNotDateOrRegExp(cx, obj);
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}
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// The items in the protoAndIfaceArray are indexed by the prototypes::id::ID and
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// constructors::id::ID enums, in that order. The end of the prototype objects
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// should be the start of the interface objects.
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static_assert((size_t)constructors::id::_ID_Start ==
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(size_t)prototypes::id::_ID_Count,
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"Overlapping or discontiguous indexes.");
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const size_t kProtoAndIfaceCacheCount = constructors::id::_ID_Count;
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inline void
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AllocateProtoAndIfaceCache(JSObject* obj)
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{
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MOZ_ASSERT(js::GetObjectClass(obj)->flags & JSCLASS_DOM_GLOBAL);
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MOZ_ASSERT(js::GetReservedSlot(obj, DOM_PROTOTYPE_SLOT).isUndefined());
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JS::Heap<JSObject*>* protoAndIfaceArray = new JS::Heap<JSObject*>[kProtoAndIfaceCacheCount];
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js::SetReservedSlot(obj, DOM_PROTOTYPE_SLOT,
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JS::PrivateValue(protoAndIfaceArray));
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}
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inline void
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TraceProtoAndIfaceCache(JSTracer* trc, JSObject* obj)
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{
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MOZ_ASSERT(js::GetObjectClass(obj)->flags & JSCLASS_DOM_GLOBAL);
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if (!HasProtoAndIfaceArray(obj))
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return;
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JS::Heap<JSObject*>* protoAndIfaceArray = GetProtoAndIfaceArray(obj);
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for (size_t i = 0; i < kProtoAndIfaceCacheCount; ++i) {
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if (protoAndIfaceArray[i]) {
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JS_CallHeapObjectTracer(trc, &protoAndIfaceArray[i], "protoAndIfaceArray[i]");
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}
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}
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}
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inline void
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DestroyProtoAndIfaceCache(JSObject* obj)
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{
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MOZ_ASSERT(js::GetObjectClass(obj)->flags & JSCLASS_DOM_GLOBAL);
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JS::Heap<JSObject*>* protoAndIfaceArray = GetProtoAndIfaceArray(obj);
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delete [] protoAndIfaceArray;
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}
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/**
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* Add constants to an object.
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*/
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bool
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DefineConstants(JSContext* cx, JS::Handle<JSObject*> obj,
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const ConstantSpec* cs);
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struct JSNativeHolder
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{
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JSNative mNative;
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const NativePropertyHooks* mPropertyHooks;
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};
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struct NamedConstructor
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{
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const char* mName;
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const JSNativeHolder mHolder;
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unsigned mNargs;
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};
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/*
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* Create a DOM interface object (if constructorClass is non-null) and/or a
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* DOM interface prototype object (if protoClass is non-null).
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*
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* global is used as the parent of the interface object and the interface
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* prototype object
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* protoProto is the prototype to use for the interface prototype object.
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* interfaceProto is the prototype to use for the interface object.
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* protoClass is the JSClass to use for the interface prototype object.
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* This is null if we should not create an interface prototype
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* object.
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* protoCache a pointer to a JSObject pointer where we should cache the
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* interface prototype object. This must be null if protoClass is and
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* vice versa.
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* constructorClass is the JSClass to use for the interface object.
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* This is null if we should not create an interface object or
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* if it should be a function object.
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* constructor holds the JSNative to back the interface object which should be a
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* Function, unless constructorClass is non-null in which case it is
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* ignored. If this is null and constructorClass is also null then
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* we should not create an interface object at all.
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* ctorNargs is the length of the constructor function; 0 if no constructor
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* constructorCache a pointer to a JSObject pointer where we should cache the
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* interface object. This must be null if both constructorClass
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* and constructor are null, and non-null otherwise.
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* domClass is the DOMClass of instance objects for this class. This can be
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* null if this is not a concrete proto.
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* properties contains the methods, attributes and constants to be defined on
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* objects in any compartment.
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* chromeProperties contains the methods, attributes and constants to be defined
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* on objects in chrome compartments. This must be null if the
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* interface doesn't have any ChromeOnly properties or if the
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* object is being created in non-chrome compartment.
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* defineOnGlobal controls whether properties should be defined on the given
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* global for the interface object (if any) and named
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* constructors (if any) for this interface. This can be
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* false in situations where we want the properties to only
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* appear on privileged Xrays but not on the unprivileged
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* underlying global.
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*
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* At least one of protoClass, constructorClass or constructor should be
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* non-null. If constructorClass or constructor are non-null, the resulting
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* interface object will be defined on the given global with property name
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* |name|, which must also be non-null.
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*/
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void
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CreateInterfaceObjects(JSContext* cx, JS::Handle<JSObject*> global,
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JS::Handle<JSObject*> protoProto,
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const JSClass* protoClass, JS::Heap<JSObject*>* protoCache,
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JS::Handle<JSObject*> interfaceProto,
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const JSClass* constructorClass, const JSNativeHolder* constructor,
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unsigned ctorNargs, const NamedConstructor* namedConstructors,
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JS::Heap<JSObject*>* constructorCache, const DOMClass* domClass,
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const NativeProperties* regularProperties,
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const NativeProperties* chromeOnlyProperties,
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const char* name, bool defineOnGlobal);
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/*
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* Define the unforgeable attributes on an object.
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*/
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bool
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DefineUnforgeableAttributes(JSContext* cx, JS::Handle<JSObject*> obj,
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const Prefable<const JSPropertySpec>* props);
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bool
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DefineWebIDLBindingPropertiesOnXPCProto(JSContext* cx,
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JS::Handle<JSObject*> proto,
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const NativeProperties* properties);
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#ifdef _MSC_VER
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#define HAS_MEMBER_CHECK(_name) \
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template<typename V> static yes& Check(char (*)[(&V::_name == 0) + 1])
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#else
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#define HAS_MEMBER_CHECK(_name) \
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template<typename V> static yes& Check(char (*)[sizeof(&V::_name) + 1])
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#endif
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#define HAS_MEMBER(_name) \
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template<typename T> \
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class Has##_name##Member { \
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typedef char yes[1]; \
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typedef char no[2]; \
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HAS_MEMBER_CHECK(_name); \
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template<typename V> static no& Check(...); \
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\
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public: \
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static bool const Value = sizeof(Check<T>(nullptr)) == sizeof(yes); \
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};
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HAS_MEMBER(WrapObject)
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// HasWrapObject<T>::Value will be true if T has a WrapObject member but it's
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// not nsWrapperCache::WrapObject.
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template<typename T>
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struct HasWrapObject
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{
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private:
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typedef char yes[1];
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typedef char no[2];
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typedef JSObject* (nsWrapperCache::*WrapObject)(JSContext*,
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JS::Handle<JSObject*>);
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template<typename U, U> struct SFINAE;
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template <typename V> static no& Check(SFINAE<WrapObject, &V::WrapObject>*);
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template <typename V> static yes& Check(...);
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public:
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static bool const Value = HasWrapObjectMember<T>::Value &&
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sizeof(Check<T>(nullptr)) == sizeof(yes);
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};
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#ifdef DEBUG
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template <class T, bool isISupports=IsBaseOf<nsISupports, T>::value>
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struct
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CheckWrapperCacheCast
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{
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static bool Check()
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|
{
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return reinterpret_cast<uintptr_t>(
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static_cast<nsWrapperCache*>(
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reinterpret_cast<T*>(1))) == 1;
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}
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};
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template <class T>
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struct
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CheckWrapperCacheCast<T, true>
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|
{
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static bool Check()
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|
{
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return true;
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}
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};
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|
#endif
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MOZ_ALWAYS_INLINE bool
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|
CouldBeDOMBinding(void*)
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|
{
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return true;
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}
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MOZ_ALWAYS_INLINE bool
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|
CouldBeDOMBinding(nsWrapperCache* aCache)
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|
{
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|
return aCache->IsDOMBinding();
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|
}
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|
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// The DOM_OBJECT_SLOT_SOW slot contains a JS::ObjectValue which points to the
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|
// cached system object wrapper (SOW) or JS::UndefinedValue if this class
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|
// doesn't need SOWs.
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|
|
inline const JS::Value&
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|
GetSystemOnlyWrapperSlot(JSObject* obj)
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|
{
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|
MOZ_ASSERT(IsDOMClass(js::GetObjectJSClass(obj)) &&
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!(js::GetObjectJSClass(obj)->flags & JSCLASS_DOM_GLOBAL));
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return js::GetReservedSlot(obj, DOM_OBJECT_SLOT_SOW);
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}
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inline void
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|
SetSystemOnlyWrapperSlot(JSObject* obj, const JS::Value& v)
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|
{
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|
MOZ_ASSERT(IsDOMClass(js::GetObjectJSClass(obj)) &&
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!(js::GetObjectJSClass(obj)->flags & JSCLASS_DOM_GLOBAL));
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js::SetReservedSlot(obj, DOM_OBJECT_SLOT_SOW, v);
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}
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inline bool
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GetSameCompartmentWrapperForDOMBinding(JSObject*& obj)
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|
{
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|
const js::Class* clasp = js::GetObjectClass(obj);
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if (dom::IsDOMClass(clasp)) {
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|
if (!(clasp->flags & JSCLASS_DOM_GLOBAL)) {
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|
JS::Value v = GetSystemOnlyWrapperSlot(obj);
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|
if (v.isObject()) {
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obj = &v.toObject();
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}
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}
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return true;
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}
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|
return IsDOMProxy(obj, clasp);
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}
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inline void
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|
SetSystemOnlyWrapper(JSObject* obj, nsWrapperCache* cache, JSObject& wrapper)
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|
{
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|
SetSystemOnlyWrapperSlot(obj, JS::ObjectValue(wrapper));
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cache->SetHasSystemOnlyWrapper();
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}
|
|
|
|
// Make sure to wrap the given string value into the right compartment, as
|
|
// needed.
|
|
MOZ_ALWAYS_INLINE
|
|
bool
|
|
MaybeWrapStringValue(JSContext* cx, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
MOZ_ASSERT(rval.isString());
|
|
JSString* str = rval.toString();
|
|
if (JS::GetGCThingZone(str) != js::GetContextZone(cx)) {
|
|
return JS_WrapValue(cx, rval.address());
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Make sure to wrap the given object value into the right compartment as
|
|
// needed. This will work correctly, but possibly slowly, on all objects.
|
|
MOZ_ALWAYS_INLINE
|
|
bool
|
|
MaybeWrapObjectValue(JSContext* cx, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
MOZ_ASSERT(rval.isObject());
|
|
|
|
JSObject* obj = &rval.toObject();
|
|
if (js::GetObjectCompartment(obj) != js::GetContextCompartment(cx)) {
|
|
return JS_WrapValue(cx, rval.address());
|
|
}
|
|
|
|
// We're same-compartment, but even then we might need to wrap
|
|
// objects specially. Check for that.
|
|
if (GetSameCompartmentWrapperForDOMBinding(obj)) {
|
|
// We're a new-binding object, and "obj" now points to the right thing
|
|
rval.set(JS::ObjectValue(*obj));
|
|
return true;
|
|
}
|
|
|
|
// It's not a WebIDL object. But it might be an XPConnect one, in which case
|
|
// we may need to outerize here, so make sure to call JS_WrapValue.
|
|
return JS_WrapValue(cx, rval.address());
|
|
}
|
|
|
|
// Like MaybeWrapObjectValue, but also allows null
|
|
MOZ_ALWAYS_INLINE
|
|
bool
|
|
MaybeWrapObjectOrNullValue(JSContext* cx, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
MOZ_ASSERT(rval.isObjectOrNull());
|
|
if (rval.isNull()) {
|
|
return true;
|
|
}
|
|
return MaybeWrapObjectValue(cx, rval);
|
|
}
|
|
|
|
// Wrapping for objects that are known to not be DOM or XPConnect objects
|
|
MOZ_ALWAYS_INLINE
|
|
bool
|
|
MaybeWrapNonDOMObjectValue(JSContext* cx, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
MOZ_ASSERT(rval.isObject());
|
|
MOZ_ASSERT(!GetDOMClass(&rval.toObject()));
|
|
MOZ_ASSERT(!(js::GetObjectClass(&rval.toObject())->flags &
|
|
JSCLASS_PRIVATE_IS_NSISUPPORTS));
|
|
|
|
JSObject* obj = &rval.toObject();
|
|
if (js::GetObjectCompartment(obj) == js::GetContextCompartment(cx)) {
|
|
return true;
|
|
}
|
|
return JS_WrapValue(cx, rval.address());
|
|
}
|
|
|
|
// Like MaybeWrapNonDOMObjectValue but allows null
|
|
MOZ_ALWAYS_INLINE
|
|
bool
|
|
MaybeWrapNonDOMObjectOrNullValue(JSContext* cx, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
MOZ_ASSERT(rval.isObjectOrNull());
|
|
if (rval.isNull()) {
|
|
return true;
|
|
}
|
|
return MaybeWrapNonDOMObjectValue(cx, rval);
|
|
}
|
|
|
|
// If rval is a gcthing and is not in the compartment of cx, wrap rval
|
|
// into the compartment of cx (typically by replacing it with an Xray or
|
|
// cross-compartment wrapper around the original object).
|
|
MOZ_ALWAYS_INLINE bool
|
|
MaybeWrapValue(JSContext* cx, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
if (rval.isString()) {
|
|
return MaybeWrapStringValue(cx, rval);
|
|
}
|
|
|
|
if (!rval.isObject()) {
|
|
return true;
|
|
}
|
|
|
|
return MaybeWrapObjectValue(cx, rval);
|
|
}
|
|
|
|
static inline void
|
|
WrapNewBindingForSameCompartment(JSContext* cx, JSObject* obj, void* value,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
rval.set(JS::ObjectValue(*obj));
|
|
}
|
|
|
|
static inline void
|
|
WrapNewBindingForSameCompartment(JSContext* cx, JSObject* obj,
|
|
nsWrapperCache* value,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
if (value->HasSystemOnlyWrapper()) {
|
|
rval.set(GetSystemOnlyWrapperSlot(obj));
|
|
MOZ_ASSERT(rval.isObject());
|
|
} else {
|
|
rval.set(JS::ObjectValue(*obj));
|
|
}
|
|
}
|
|
|
|
// Create a JSObject wrapping "value", if there isn't one already, and store it
|
|
// in rval. "value" must be a concrete class that implements a
|
|
// GetWrapperPreserveColor() which can return its existing wrapper, if any, and
|
|
// a WrapObject() which will try to create a wrapper. Typically, this is done by
|
|
// having "value" inherit from nsWrapperCache.
|
|
template <class T>
|
|
MOZ_ALWAYS_INLINE bool
|
|
WrapNewBindingObject(JSContext* cx, JS::Handle<JSObject*> scope, T* value,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
MOZ_ASSERT(value);
|
|
JSObject* obj = value->GetWrapperPreserveColor();
|
|
bool couldBeDOMBinding = CouldBeDOMBinding(value);
|
|
if (obj) {
|
|
JS::ExposeObjectToActiveJS(obj);
|
|
} else {
|
|
// Inline this here while we have non-dom objects in wrapper caches.
|
|
if (!couldBeDOMBinding) {
|
|
return false;
|
|
}
|
|
|
|
obj = value->WrapObject(cx, scope);
|
|
if (!obj) {
|
|
// At this point, obj is null, so just return false.
|
|
// Callers seem to be testing JS_IsExceptionPending(cx) to
|
|
// figure out whether WrapObject() threw.
|
|
return false;
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
const DOMClass* clasp = GetDOMClass(obj);
|
|
// clasp can be null if the cache contained a non-DOM object from a
|
|
// different compartment than scope.
|
|
if (clasp) {
|
|
// Some sanity asserts about our object. Specifically:
|
|
// 1) If our class claims we're nsISupports, we better be nsISupports
|
|
// XXXbz ideally, we could assert that reinterpret_cast to nsISupports
|
|
// does the right thing, but I don't see a way to do it. :(
|
|
// 2) If our class doesn't claim we're nsISupports we better be
|
|
// reinterpret_castable to nsWrapperCache.
|
|
MOZ_ASSERT(clasp, "What happened here?");
|
|
MOZ_ASSERT_IF(clasp->mDOMObjectIsISupports, (IsBaseOf<nsISupports, T>::value));
|
|
MOZ_ASSERT(CheckWrapperCacheCast<T>::Check());
|
|
}
|
|
|
|
// When called via XrayWrapper, we end up here while running in the
|
|
// chrome compartment. But the obj we have would be created in
|
|
// whatever the content compartment is. So at this point we need to
|
|
// make sure it's correctly wrapped for the compartment of |scope|.
|
|
// cx should already be in the compartment of |scope| here.
|
|
MOZ_ASSERT(js::IsObjectInContextCompartment(scope, cx));
|
|
#endif
|
|
|
|
bool sameCompartment =
|
|
js::GetObjectCompartment(obj) == js::GetContextCompartment(cx);
|
|
if (sameCompartment && couldBeDOMBinding) {
|
|
WrapNewBindingForSameCompartment(cx, obj, value, rval);
|
|
return true;
|
|
}
|
|
|
|
rval.set(JS::ObjectValue(*obj));
|
|
return JS_WrapValue(cx, rval.address());
|
|
}
|
|
|
|
// Create a JSObject wrapping "value", for cases when "value" is a
|
|
// non-wrapper-cached object using WebIDL bindings. "value" must implement a
|
|
// WrapObject() method taking a JSContext and a scope.
|
|
template <class T>
|
|
inline bool
|
|
WrapNewBindingNonWrapperCachedObject(JSContext* cx,
|
|
JS::Handle<JSObject*> scopeArg,
|
|
T* value,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
MOZ_ASSERT(value);
|
|
// We try to wrap in the compartment of the underlying object of "scope"
|
|
JS::Rooted<JSObject*> obj(cx);
|
|
{
|
|
// scope for the JSAutoCompartment so that we restore the compartment
|
|
// before we call JS_WrapValue.
|
|
Maybe<JSAutoCompartment> ac;
|
|
// Maybe<Handle> doesn't so much work, and in any case, adding
|
|
// more Maybe (one for a Rooted and one for a Handle) adds more
|
|
// code (and branches!) than just adding a single rooted.
|
|
JS::Rooted<JSObject*> scope(cx, scopeArg);
|
|
if (js::IsWrapper(scope)) {
|
|
scope = js::CheckedUnwrap(scope, /* stopAtOuter = */ false);
|
|
if (!scope)
|
|
return false;
|
|
ac.construct(cx, scope);
|
|
}
|
|
|
|
obj = value->WrapObject(cx, scope);
|
|
}
|
|
|
|
if (!obj) {
|
|
return false;
|
|
}
|
|
|
|
// We can end up here in all sorts of compartments, per above. Make
|
|
// sure to JS_WrapValue!
|
|
rval.set(JS::ObjectValue(*obj));
|
|
return JS_WrapValue(cx, rval.address());
|
|
}
|
|
|
|
// Create a JSObject wrapping "value", for cases when "value" is a
|
|
// non-wrapper-cached owned object using WebIDL bindings. "value" must implement a
|
|
// WrapObject() method taking a JSContext, a scope, and a boolean outparam that
|
|
// is true if the JSObject took ownership
|
|
template <class T>
|
|
inline bool
|
|
WrapNewBindingNonWrapperCachedOwnedObject(JSContext* cx,
|
|
JS::Handle<JSObject*> scopeArg,
|
|
nsAutoPtr<T>& value,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
// We do a runtime check on value, because otherwise we might in
|
|
// fact end up wrapping a null and invoking methods on it later.
|
|
if (!value) {
|
|
NS_RUNTIMEABORT("Don't try to wrap null objects");
|
|
}
|
|
// We try to wrap in the compartment of the underlying object of "scope"
|
|
JS::Rooted<JSObject*> obj(cx);
|
|
{
|
|
// scope for the JSAutoCompartment so that we restore the compartment
|
|
// before we call JS_WrapValue.
|
|
Maybe<JSAutoCompartment> ac;
|
|
// Maybe<Handle> doesn't so much work, and in any case, adding
|
|
// more Maybe (one for a Rooted and one for a Handle) adds more
|
|
// code (and branches!) than just adding a single rooted.
|
|
JS::Rooted<JSObject*> scope(cx, scopeArg);
|
|
if (js::IsWrapper(scope)) {
|
|
scope = js::CheckedUnwrap(scope, /* stopAtOuter = */ false);
|
|
if (!scope)
|
|
return false;
|
|
ac.construct(cx, scope);
|
|
}
|
|
|
|
bool tookOwnership = false;
|
|
obj = value->WrapObject(cx, scope, &tookOwnership);
|
|
MOZ_ASSERT_IF(obj, tookOwnership);
|
|
if (tookOwnership) {
|
|
value.forget();
|
|
}
|
|
}
|
|
|
|
if (!obj) {
|
|
return false;
|
|
}
|
|
|
|
// We can end up here in all sorts of compartments, per above. Make
|
|
// sure to JS_WrapValue!
|
|
rval.set(JS::ObjectValue(*obj));
|
|
return JS_WrapValue(cx, rval.address());
|
|
}
|
|
|
|
// Helper for smart pointers (nsAutoPtr/nsRefPtr/nsCOMPtr).
|
|
template <template <typename> class SmartPtr, typename T>
|
|
inline bool
|
|
WrapNewBindingNonWrapperCachedObject(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
const SmartPtr<T>& value,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapNewBindingNonWrapperCachedObject(cx, scope, value.get(), rval);
|
|
}
|
|
|
|
// Only set allowNativeWrapper to false if you really know you need it, if in
|
|
// doubt use true. Setting it to false disables security wrappers.
|
|
bool
|
|
NativeInterface2JSObjectAndThrowIfFailed(JSContext* aCx,
|
|
JS::Handle<JSObject*> aScope,
|
|
JS::Value* aRetval,
|
|
xpcObjectHelper& aHelper,
|
|
const nsIID* aIID,
|
|
bool aAllowNativeWrapper);
|
|
|
|
/**
|
|
* A method to handle new-binding wrap failure, by possibly falling back to
|
|
* wrapping as a non-new-binding object.
|
|
*/
|
|
template <class T>
|
|
MOZ_ALWAYS_INLINE bool
|
|
HandleNewBindingWrappingFailure(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
T* value, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
if (JS_IsExceptionPending(cx)) {
|
|
return false;
|
|
}
|
|
|
|
qsObjectHelper helper(value, GetWrapperCache(value));
|
|
return NativeInterface2JSObjectAndThrowIfFailed(cx, scope, rval.address(),
|
|
helper, nullptr, true);
|
|
}
|
|
|
|
// Helper for calling HandleNewBindingWrappingFailure with smart pointers
|
|
// (nsAutoPtr/nsRefPtr/nsCOMPtr) or references.
|
|
HAS_MEMBER(get)
|
|
|
|
template <class T, bool isSmartPtr=HasgetMember<T>::Value>
|
|
struct HandleNewBindingWrappingFailureHelper
|
|
{
|
|
static inline bool Wrap(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
const T& value, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return HandleNewBindingWrappingFailure(cx, scope, value.get(), rval);
|
|
}
|
|
};
|
|
|
|
template <class T>
|
|
struct HandleNewBindingWrappingFailureHelper<T, false>
|
|
{
|
|
static inline bool Wrap(JSContext* cx, JS::Handle<JSObject*> scope, T& value,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return HandleNewBindingWrappingFailure(cx, scope, &value, rval);
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
inline bool
|
|
HandleNewBindingWrappingFailure(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
T& value, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return HandleNewBindingWrappingFailureHelper<T>::Wrap(cx, scope, value, rval);
|
|
}
|
|
|
|
template<bool Fatal>
|
|
inline bool
|
|
EnumValueNotFound(JSContext* cx, const jschar* chars, size_t length,
|
|
const char* type, const char* sourceDescription)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
template<>
|
|
inline bool
|
|
EnumValueNotFound<false>(JSContext* cx, const jschar* chars, size_t length,
|
|
const char* type, const char* sourceDescription)
|
|
{
|
|
// TODO: Log a warning to the console.
|
|
return true;
|
|
}
|
|
|
|
template<>
|
|
inline bool
|
|
EnumValueNotFound<true>(JSContext* cx, const jschar* chars, size_t length,
|
|
const char* type, const char* sourceDescription)
|
|
{
|
|
NS_LossyConvertUTF16toASCII deflated(static_cast<const PRUnichar*>(chars),
|
|
length);
|
|
return ThrowErrorMessage(cx, MSG_INVALID_ENUM_VALUE, sourceDescription,
|
|
deflated.get(), type);
|
|
}
|
|
|
|
|
|
template<bool InvalidValueFatal>
|
|
inline int
|
|
FindEnumStringIndex(JSContext* cx, JS::Value v, const EnumEntry* values,
|
|
const char* type, const char* sourceDescription, bool* ok)
|
|
{
|
|
// JS_StringEqualsAscii is slow as molasses, so don't use it here.
|
|
JSString* str = JS_ValueToString(cx, v);
|
|
if (!str) {
|
|
*ok = false;
|
|
return 0;
|
|
}
|
|
JS::Anchor<JSString*> anchor(str);
|
|
size_t length;
|
|
const jschar* chars = JS_GetStringCharsAndLength(cx, str, &length);
|
|
if (!chars) {
|
|
*ok = false;
|
|
return 0;
|
|
}
|
|
int i = 0;
|
|
for (const EnumEntry* value = values; value->value; ++value, ++i) {
|
|
if (length != value->length) {
|
|
continue;
|
|
}
|
|
|
|
bool equal = true;
|
|
const char* val = value->value;
|
|
for (size_t j = 0; j != length; ++j) {
|
|
if (unsigned(val[j]) != unsigned(chars[j])) {
|
|
equal = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (equal) {
|
|
*ok = true;
|
|
return i;
|
|
}
|
|
}
|
|
|
|
*ok = EnumValueNotFound<InvalidValueFatal>(cx, chars, length, type,
|
|
sourceDescription);
|
|
return -1;
|
|
}
|
|
|
|
inline nsWrapperCache*
|
|
GetWrapperCache(const ParentObject& aParentObject)
|
|
{
|
|
return aParentObject.mWrapperCache;
|
|
}
|
|
|
|
template<class T>
|
|
inline T*
|
|
GetParentPointer(T* aObject)
|
|
{
|
|
return aObject;
|
|
}
|
|
|
|
inline nsISupports*
|
|
GetParentPointer(const ParentObject& aObject)
|
|
{
|
|
return aObject.mObject;
|
|
}
|
|
|
|
template<class T>
|
|
inline void
|
|
ClearWrapper(T* p, nsWrapperCache* cache)
|
|
{
|
|
cache->ClearWrapper();
|
|
}
|
|
|
|
template<class T>
|
|
inline void
|
|
ClearWrapper(T* p, void*)
|
|
{
|
|
nsWrapperCache* cache;
|
|
CallQueryInterface(p, &cache);
|
|
ClearWrapper(p, cache);
|
|
}
|
|
|
|
// Attempt to preserve the wrapper, if any, for a Paris DOM bindings object.
|
|
// Return true if we successfully preserved the wrapper, or there is no wrapper
|
|
// to preserve. In the latter case we don't need to preserve the wrapper, because
|
|
// the object can only be obtained by JS once, or they cannot be meaningfully
|
|
// owned from the native side.
|
|
//
|
|
// This operation will return false only for non-nsISupports cycle-collected
|
|
// objects, because we cannot determine if they are wrappercached or not.
|
|
bool
|
|
TryPreserveWrapper(JSObject* obj);
|
|
|
|
// Can only be called with the immediate prototype of the instance object. Can
|
|
// only be called on the prototype of an object known to be a DOM instance.
|
|
bool
|
|
InstanceClassHasProtoAtDepth(JS::Handle<JSObject*> protoObject, uint32_t protoID,
|
|
uint32_t depth);
|
|
|
|
// Only set allowNativeWrapper to false if you really know you need it, if in
|
|
// doubt use true. Setting it to false disables security wrappers.
|
|
bool
|
|
XPCOMObjectToJsval(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
xpcObjectHelper& helper, const nsIID* iid,
|
|
bool allowNativeWrapper, JS::Value* rval);
|
|
|
|
// Special-cased wrapping for variants
|
|
bool
|
|
VariantToJsval(JSContext* aCx, JS::Handle<JSObject*> aScope,
|
|
nsIVariant* aVariant, JS::Value* aRetval);
|
|
|
|
// Wrap an object "p" which is not using WebIDL bindings yet. This _will_
|
|
// actually work on WebIDL binding objects that are wrappercached, but will be
|
|
// much slower than WrapNewBindingObject. "cache" must either be null or be the
|
|
// nsWrapperCache for "p".
|
|
template<class T>
|
|
inline bool
|
|
WrapObject(JSContext* cx, JS::Handle<JSObject*> scope, T* p,
|
|
nsWrapperCache* cache, const nsIID* iid,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
if (xpc_FastGetCachedWrapper(cache, scope, rval.address()))
|
|
return true;
|
|
qsObjectHelper helper(p, cache);
|
|
return XPCOMObjectToJsval(cx, scope, helper, iid, true, rval.address());
|
|
}
|
|
|
|
// A specialization of the above for nsIVariant, because that needs to
|
|
// do something different.
|
|
template<>
|
|
inline bool
|
|
WrapObject<nsIVariant>(JSContext* cx, JS::Handle<JSObject*> scope, nsIVariant* p,
|
|
nsWrapperCache* cache, const nsIID* iid,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
MOZ_ASSERT(iid);
|
|
MOZ_ASSERT(iid->Equals(NS_GET_IID(nsIVariant)));
|
|
return VariantToJsval(cx, scope, p, rval.address());
|
|
}
|
|
|
|
// Wrap an object "p" which is not using WebIDL bindings yet. Just like the
|
|
// variant that takes an nsWrapperCache above, but will try to auto-derive the
|
|
// nsWrapperCache* from "p".
|
|
template<class T>
|
|
inline bool
|
|
WrapObject(JSContext* cx, JS::Handle<JSObject*> scope, T* p, const nsIID* iid,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapObject(cx, scope, p, GetWrapperCache(p), iid, rval);
|
|
}
|
|
|
|
// Just like the WrapObject above, but without requiring you to pick which
|
|
// interface you're wrapping as. This should only be used for objects that have
|
|
// classinfo, for which it doesn't matter what IID is used to wrap.
|
|
template<class T>
|
|
inline bool
|
|
WrapObject(JSContext* cx, JS::Handle<JSObject*> scope, T* p,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapObject(cx, scope, p, NULL, rval);
|
|
}
|
|
|
|
// Helper to make it possible to wrap directly out of an nsCOMPtr
|
|
template<class T>
|
|
inline bool
|
|
WrapObject(JSContext* cx, JS::Handle<JSObject*> scope, const nsCOMPtr<T>& p,
|
|
const nsIID* iid, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapObject(cx, scope, p.get(), iid, rval);
|
|
}
|
|
|
|
// Helper to make it possible to wrap directly out of an nsCOMPtr
|
|
template<class T>
|
|
inline bool
|
|
WrapObject(JSContext* cx, JS::Handle<JSObject*> scope, const nsCOMPtr<T>& p,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapObject(cx, scope, p, NULL, rval);
|
|
}
|
|
|
|
// Helper to make it possible to wrap directly out of an nsRefPtr
|
|
template<class T>
|
|
inline bool
|
|
WrapObject(JSContext* cx, JS::Handle<JSObject*> scope, const nsRefPtr<T>& p,
|
|
const nsIID* iid, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapObject(cx, scope, p.get(), iid, rval);
|
|
}
|
|
|
|
// Helper to make it possible to wrap directly out of an nsRefPtr
|
|
template<class T>
|
|
inline bool
|
|
WrapObject(JSContext* cx, JS::Handle<JSObject*> scope, const nsRefPtr<T>& p,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapObject(cx, scope, p, NULL, rval);
|
|
}
|
|
|
|
// Specialization to make it easy to use WrapObject in codegen.
|
|
template<>
|
|
inline bool
|
|
WrapObject<JSObject>(JSContext* cx, JS::Handle<JSObject*> scope, JSObject* p,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
rval.set(JS::ObjectOrNullValue(p));
|
|
return true;
|
|
}
|
|
|
|
inline bool
|
|
WrapObject(JSContext* cx, JS::Handle<JSObject*> scope, JSObject& p,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
rval.set(JS::ObjectValue(p));
|
|
return true;
|
|
}
|
|
|
|
// Given an object "p" that inherits from nsISupports, wrap it and return the
|
|
// result. Null is returned on wrapping failure. This is somewhat similar to
|
|
// WrapObject() above, but does NOT allow Xrays around the result, since we
|
|
// don't want those for our parent object.
|
|
template<typename T>
|
|
static inline JSObject*
|
|
WrapNativeISupportsParent(JSContext* cx, JS::Handle<JSObject*> scope, T* p,
|
|
nsWrapperCache* cache)
|
|
{
|
|
qsObjectHelper helper(ToSupports(p), cache);
|
|
JS::Rooted<JS::Value> v(cx);
|
|
return XPCOMObjectToJsval(cx, scope, helper, nullptr, false, v.address()) ?
|
|
JSVAL_TO_OBJECT(v) :
|
|
nullptr;
|
|
}
|
|
|
|
|
|
// Fallback for when our parent is not a WebIDL binding object.
|
|
template<typename T, bool isISupports=IsBaseOf<nsISupports, T>::value>
|
|
struct WrapNativeParentFallback
|
|
{
|
|
static inline JSObject* Wrap(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
T* parent, nsWrapperCache* cache)
|
|
{
|
|
return nullptr;
|
|
}
|
|
};
|
|
|
|
// Fallback for when our parent is not a WebIDL binding object but _is_ an
|
|
// nsISupports object.
|
|
template<typename T >
|
|
struct WrapNativeParentFallback<T, true >
|
|
{
|
|
static inline JSObject* Wrap(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
T* parent, nsWrapperCache* cache)
|
|
{
|
|
return WrapNativeISupportsParent(cx, scope, parent, cache);
|
|
}
|
|
};
|
|
|
|
// Wrapping of our native parent, for cases when it's a WebIDL object (though
|
|
// possibly preffed off).
|
|
template<typename T, bool hasWrapObject=HasWrapObject<T>::Value >
|
|
struct WrapNativeParentHelper
|
|
{
|
|
static inline JSObject* Wrap(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
T* parent, nsWrapperCache* cache)
|
|
{
|
|
MOZ_ASSERT(cache);
|
|
|
|
JSObject* obj;
|
|
if ((obj = cache->GetWrapper())) {
|
|
return obj;
|
|
}
|
|
|
|
// Inline this here while we have non-dom objects in wrapper caches.
|
|
if (!CouldBeDOMBinding(parent)) {
|
|
obj = WrapNativeParentFallback<T>::Wrap(cx, scope, parent, cache);
|
|
} else {
|
|
obj = parent->WrapObject(cx, scope);
|
|
}
|
|
|
|
return obj;
|
|
}
|
|
};
|
|
|
|
// Wrapping of our native parent, for cases when it's not a WebIDL object. In
|
|
// this case it must be nsISupports.
|
|
template<typename T>
|
|
struct WrapNativeParentHelper<T, false >
|
|
{
|
|
static inline JSObject* Wrap(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
T* parent, nsWrapperCache* cache)
|
|
{
|
|
JSObject* obj;
|
|
if (cache && (obj = cache->GetWrapper())) {
|
|
#ifdef DEBUG
|
|
NS_ASSERTION(WrapNativeISupportsParent(cx, scope, parent, cache) == obj,
|
|
"Unexpected object in nsWrapperCache");
|
|
#endif
|
|
return obj;
|
|
}
|
|
|
|
return WrapNativeISupportsParent(cx, scope, parent, cache);
|
|
}
|
|
};
|
|
|
|
// Wrapping of our native parent.
|
|
template<typename T>
|
|
static inline JSObject*
|
|
WrapNativeParent(JSContext* cx, JS::Handle<JSObject*> scope, T* p,
|
|
nsWrapperCache* cache)
|
|
{
|
|
if (!p) {
|
|
return scope;
|
|
}
|
|
|
|
return WrapNativeParentHelper<T>::Wrap(cx, scope, p, cache);
|
|
}
|
|
|
|
// Wrapping of our native parent, when we don't want to explicitly pass in
|
|
// things like the nsWrapperCache for it.
|
|
template<typename T>
|
|
static inline JSObject*
|
|
WrapNativeParent(JSContext* cx, JS::Handle<JSObject*> scope, const T& p)
|
|
{
|
|
return WrapNativeParent(cx, scope, GetParentPointer(p), GetWrapperCache(p));
|
|
}
|
|
|
|
// A way to differentiate between nodes, which use the parent object
|
|
// returned by native->GetParentObject(), and all other objects, which
|
|
// just use the parent's global.
|
|
static inline JSObject*
|
|
GetRealParentObject(void* aParent, JSObject* aParentObject)
|
|
{
|
|
return aParentObject ?
|
|
js::GetGlobalForObjectCrossCompartment(aParentObject) : nullptr;
|
|
}
|
|
|
|
static inline JSObject*
|
|
GetRealParentObject(Element* aParent, JSObject* aParentObject)
|
|
{
|
|
return aParentObject;
|
|
}
|
|
|
|
HAS_MEMBER(GetParentObject)
|
|
|
|
template<typename T, bool WrapperCached=HasGetParentObjectMember<T>::Value>
|
|
struct GetParentObject
|
|
{
|
|
static JSObject* Get(JSContext* cx, JS::Handle<JSObject*> obj)
|
|
{
|
|
T* native = UnwrapDOMObject<T>(obj);
|
|
return
|
|
GetRealParentObject(native,
|
|
WrapNativeParent(cx, obj, native->GetParentObject()));
|
|
}
|
|
};
|
|
|
|
template<typename T>
|
|
struct GetParentObject<T, false>
|
|
{
|
|
static JSObject* Get(JSContext* cx, JS::Handle<JSObject*> obj)
|
|
{
|
|
MOZ_CRASH();
|
|
return nullptr;
|
|
}
|
|
};
|
|
|
|
MOZ_ALWAYS_INLINE
|
|
JSObject* GetJSObjectFromCallback(CallbackObject* callback)
|
|
{
|
|
return callback->Callback();
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE
|
|
JSObject* GetJSObjectFromCallback(void* noncallback)
|
|
{
|
|
return nullptr;
|
|
}
|
|
|
|
template<typename T>
|
|
static inline JSObject*
|
|
WrapCallThisObject(JSContext* cx, JS::Handle<JSObject*> scope, const T& p)
|
|
{
|
|
// Callbacks are nsISupports, so WrapNativeParent will just happily wrap them
|
|
// up as an nsISupports XPCWrappedNative... which is not at all what we want.
|
|
// So we need to special-case them.
|
|
JS::Rooted<JSObject*> obj(cx, GetJSObjectFromCallback(p));
|
|
if (!obj) {
|
|
// WrapNativeParent is a bit of a Swiss army knife that will
|
|
// wrap anything for us.
|
|
obj = WrapNativeParent(cx, scope, p);
|
|
if (!obj) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
// But all that won't necessarily put things in the compartment of cx.
|
|
if (!JS_WrapObject(cx, obj.address())) {
|
|
return nullptr;
|
|
}
|
|
|
|
return obj;
|
|
}
|
|
|
|
// Helper for calling WrapNewBindingObject with smart pointers
|
|
// (nsAutoPtr/nsRefPtr/nsCOMPtr) or references.
|
|
template <class T, bool isSmartPtr=HasgetMember<T>::Value>
|
|
struct WrapNewBindingObjectHelper
|
|
{
|
|
static inline bool Wrap(JSContext* cx, JS::Handle<JSObject*> scope,
|
|
const T& value, JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapNewBindingObject(cx, scope, value.get(), rval);
|
|
}
|
|
};
|
|
|
|
template <class T>
|
|
struct WrapNewBindingObjectHelper<T, false>
|
|
{
|
|
static inline bool Wrap(JSContext* cx, JS::Handle<JSObject*> scope, T& value,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapNewBindingObject(cx, scope, &value, rval);
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
inline bool
|
|
WrapNewBindingObject(JSContext* cx, JS::Handle<JSObject*> scope, T& value,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
return WrapNewBindingObjectHelper<T>::Wrap(cx, scope, value, rval);
|
|
}
|
|
|
|
template <class T>
|
|
inline JSObject*
|
|
GetCallbackFromCallbackObject(T* aObj)
|
|
{
|
|
return aObj->Callback();
|
|
}
|
|
|
|
// Helper for getting the callback JSObject* of a smart ptr around a
|
|
// CallbackObject or a reference to a CallbackObject or something like
|
|
// that.
|
|
template <class T, bool isSmartPtr=HasgetMember<T>::Value>
|
|
struct GetCallbackFromCallbackObjectHelper
|
|
{
|
|
static inline JSObject* Get(const T& aObj)
|
|
{
|
|
return GetCallbackFromCallbackObject(aObj.get());
|
|
}
|
|
};
|
|
|
|
template <class T>
|
|
struct GetCallbackFromCallbackObjectHelper<T, false>
|
|
{
|
|
static inline JSObject* Get(T& aObj)
|
|
{
|
|
return GetCallbackFromCallbackObject(&aObj);
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
inline JSObject*
|
|
GetCallbackFromCallbackObject(T& aObj)
|
|
{
|
|
return GetCallbackFromCallbackObjectHelper<T>::Get(aObj);
|
|
}
|
|
|
|
static inline bool
|
|
InternJSString(JSContext* cx, jsid& id, const char* chars)
|
|
{
|
|
if (JSString *str = ::JS_InternString(cx, chars)) {
|
|
id = INTERNED_STRING_TO_JSID(cx, str);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Spec needs a name property
|
|
template <typename Spec>
|
|
static bool
|
|
InitIds(JSContext* cx, const Prefable<Spec>* prefableSpecs, jsid* ids)
|
|
{
|
|
MOZ_ASSERT(prefableSpecs);
|
|
MOZ_ASSERT(prefableSpecs->specs);
|
|
do {
|
|
// We ignore whether the set of ids is enabled and just intern all the IDs,
|
|
// because this is only done once per application runtime.
|
|
Spec* spec = prefableSpecs->specs;
|
|
do {
|
|
if (!InternJSString(cx, *ids, spec->name)) {
|
|
return false;
|
|
}
|
|
} while (++ids, (++spec)->name);
|
|
|
|
// We ran out of ids for that pref. Put a JSID_VOID in on the id
|
|
// corresponding to the list terminator for the pref.
|
|
*ids = JSID_VOID;
|
|
++ids;
|
|
} while ((++prefableSpecs)->specs);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
QueryInterface(JSContext* cx, unsigned argc, JS::Value* vp);
|
|
|
|
template <class T>
|
|
struct
|
|
WantsQueryInterface
|
|
{
|
|
static_assert(IsBaseOf<nsISupports, T>::value,
|
|
"QueryInterface can't work without an nsISupports.");
|
|
static bool Enabled(JSContext* aCx, JSObject* aGlobal)
|
|
{
|
|
return NS_IsMainThread() && IsChromeOrXBL(aCx, aGlobal);
|
|
}
|
|
};
|
|
|
|
bool
|
|
ThrowingConstructor(JSContext* cx, unsigned argc, JS::Value* vp);
|
|
|
|
// vp is allowed to be null; in that case no get will be attempted,
|
|
// and *found will simply indicate whether the property exists.
|
|
bool
|
|
GetPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
|
|
JS::Handle<jsid> id, bool* found,
|
|
JS::Value* vp);
|
|
|
|
bool
|
|
HasPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
|
|
JS::Handle<jsid> id);
|
|
|
|
|
|
// Append the property names in "names" to "props". If
|
|
// shadowPrototypeProperties is false then skip properties that are also
|
|
// present on the proto chain of proxy. If shadowPrototypeProperties is true,
|
|
// then the "proxy" argument is ignored.
|
|
bool
|
|
AppendNamedPropertyIds(JSContext* cx, JS::Handle<JSObject*> proxy,
|
|
nsTArray<nsString>& names,
|
|
bool shadowPrototypeProperties, JS::AutoIdVector& props);
|
|
|
|
// A struct that has the same layout as an nsDependentString but much
|
|
// faster constructor and destructor behavior
|
|
struct FakeDependentString {
|
|
FakeDependentString() :
|
|
mFlags(nsDependentString::F_TERMINATED)
|
|
{
|
|
}
|
|
|
|
void SetData(const nsDependentString::char_type* aData,
|
|
nsDependentString::size_type aLength) {
|
|
MOZ_ASSERT(mFlags == nsDependentString::F_TERMINATED);
|
|
mData = aData;
|
|
mLength = aLength;
|
|
}
|
|
|
|
void Truncate() {
|
|
mData = nsDependentString::char_traits::sEmptyBuffer;
|
|
mLength = 0;
|
|
}
|
|
|
|
void SetNull() {
|
|
Truncate();
|
|
mFlags |= nsDependentString::F_VOIDED;
|
|
}
|
|
|
|
const nsDependentString::char_type* Data() const
|
|
{
|
|
return mData;
|
|
}
|
|
|
|
nsDependentString::size_type Length() const
|
|
{
|
|
return mLength;
|
|
}
|
|
|
|
// If this ever changes, change the corresponding code in the
|
|
// Optional<nsAString> specialization as well.
|
|
const nsAString* ToAStringPtr() const {
|
|
return reinterpret_cast<const nsDependentString*>(this);
|
|
}
|
|
|
|
nsAString* ToAStringPtr() {
|
|
return reinterpret_cast<nsDependentString*>(this);
|
|
}
|
|
|
|
operator const nsAString& () const {
|
|
return *reinterpret_cast<const nsDependentString*>(this);
|
|
}
|
|
|
|
private:
|
|
const nsDependentString::char_type* mData;
|
|
nsDependentString::size_type mLength;
|
|
uint32_t mFlags;
|
|
|
|
// A class to use for our static asserts to ensure our object layout
|
|
// matches that of nsDependentString.
|
|
class DependentStringAsserter;
|
|
friend class DependentStringAsserter;
|
|
|
|
class DepedentStringAsserter : public nsDependentString {
|
|
public:
|
|
static void StaticAsserts() {
|
|
static_assert(sizeof(FakeDependentString) == sizeof(nsDependentString),
|
|
"Must have right object size");
|
|
static_assert(offsetof(FakeDependentString, mData) ==
|
|
offsetof(DepedentStringAsserter, mData),
|
|
"Offset of mData should match");
|
|
static_assert(offsetof(FakeDependentString, mLength) ==
|
|
offsetof(DepedentStringAsserter, mLength),
|
|
"Offset of mLength should match");
|
|
static_assert(offsetof(FakeDependentString, mFlags) ==
|
|
offsetof(DepedentStringAsserter, mFlags),
|
|
"Offset of mFlags should match");
|
|
}
|
|
};
|
|
};
|
|
|
|
enum StringificationBehavior {
|
|
eStringify,
|
|
eEmpty,
|
|
eNull
|
|
};
|
|
|
|
// pval must not be null and must point to a rooted JS::Value
|
|
static inline bool
|
|
ConvertJSValueToString(JSContext* cx, JS::Handle<JS::Value> v,
|
|
JS::MutableHandle<JS::Value> pval,
|
|
StringificationBehavior nullBehavior,
|
|
StringificationBehavior undefinedBehavior,
|
|
FakeDependentString& result)
|
|
{
|
|
JSString *s;
|
|
if (v.isString()) {
|
|
s = v.toString();
|
|
} else {
|
|
StringificationBehavior behavior;
|
|
if (v.isNull()) {
|
|
behavior = nullBehavior;
|
|
} else if (v.isUndefined()) {
|
|
behavior = undefinedBehavior;
|
|
} else {
|
|
behavior = eStringify;
|
|
}
|
|
|
|
if (behavior != eStringify) {
|
|
if (behavior == eEmpty) {
|
|
result.Truncate();
|
|
} else {
|
|
result.SetNull();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
s = JS_ValueToString(cx, v);
|
|
if (!s) {
|
|
return false;
|
|
}
|
|
pval.set(JS::StringValue(s)); // Root the new string.
|
|
}
|
|
|
|
size_t len;
|
|
const jschar *chars = JS_GetStringCharsZAndLength(cx, s, &len);
|
|
if (!chars) {
|
|
return false;
|
|
}
|
|
|
|
result.SetData(chars, len);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
ConvertJSValueToByteString(JSContext* cx, JS::Handle<JS::Value> v,
|
|
JS::MutableHandle<JS::Value> pval, bool nullable,
|
|
nsACString& result);
|
|
|
|
template<typename T>
|
|
void DoTraceSequence(JSTracer* trc, FallibleTArray<T>& seq);
|
|
template<typename T>
|
|
void DoTraceSequence(JSTracer* trc, InfallibleTArray<T>& seq);
|
|
|
|
// Class for simple sequence arguments, only used internally by codegen.
|
|
template<typename T>
|
|
class AutoSequence : public AutoFallibleTArray<T, 16>
|
|
{
|
|
public:
|
|
AutoSequence() : AutoFallibleTArray<T, 16>()
|
|
{}
|
|
|
|
// Allow converting to const sequences as needed
|
|
operator const Sequence<T>&() const {
|
|
return *reinterpret_cast<const Sequence<T>*>(this);
|
|
}
|
|
};
|
|
|
|
// Class used to trace sequences, with specializations for various
|
|
// sequence types.
|
|
template<typename T,
|
|
bool isDictionary=IsBaseOf<DictionaryBase, T>::value,
|
|
bool isTypedArray=IsBaseOf<AllTypedArraysBase, T>::value>
|
|
class SequenceTracer
|
|
{
|
|
explicit SequenceTracer() MOZ_DELETE; // Should never be instantiated
|
|
};
|
|
|
|
// sequence<object> or sequence<object?>
|
|
template<>
|
|
class SequenceTracer<JSObject*, false, false>
|
|
{
|
|
explicit SequenceTracer() MOZ_DELETE; // Should never be instantiated
|
|
|
|
public:
|
|
static void TraceSequence(JSTracer* trc, JSObject** objp, JSObject** end) {
|
|
for (; objp != end; ++objp) {
|
|
JS_CallObjectTracer(trc, objp, "sequence<object>");
|
|
}
|
|
}
|
|
};
|
|
|
|
// sequence<any>
|
|
template<>
|
|
class SequenceTracer<JS::Value, false, false>
|
|
{
|
|
explicit SequenceTracer() MOZ_DELETE; // Should never be instantiated
|
|
|
|
public:
|
|
static void TraceSequence(JSTracer* trc, JS::Value* valp, JS::Value* end) {
|
|
for (; valp != end; ++valp) {
|
|
JS_CallValueTracer(trc, valp, "sequence<any>");
|
|
}
|
|
}
|
|
};
|
|
|
|
// sequence<sequence<T>>
|
|
template<typename T>
|
|
class SequenceTracer<Sequence<T>, false, false>
|
|
{
|
|
explicit SequenceTracer() MOZ_DELETE; // Should never be instantiated
|
|
|
|
public:
|
|
static void TraceSequence(JSTracer* trc, Sequence<T>* seqp, Sequence<T>* end) {
|
|
for (; seqp != end; ++seqp) {
|
|
DoTraceSequence(trc, *seqp);
|
|
}
|
|
}
|
|
};
|
|
|
|
// sequence<sequence<T>> as return value
|
|
template<typename T>
|
|
class SequenceTracer<nsTArray<T>, false, false>
|
|
{
|
|
explicit SequenceTracer() MOZ_DELETE; // Should never be instantiated
|
|
|
|
public:
|
|
static void TraceSequence(JSTracer* trc, nsTArray<T>* seqp, nsTArray<T>* end) {
|
|
for (; seqp != end; ++seqp) {
|
|
DoTraceSequence(trc, *seqp);
|
|
}
|
|
}
|
|
};
|
|
|
|
// sequence<someDictionary>
|
|
template<typename T>
|
|
class SequenceTracer<T, true, false>
|
|
{
|
|
explicit SequenceTracer() MOZ_DELETE; // Should never be instantiated
|
|
|
|
public:
|
|
static void TraceSequence(JSTracer* trc, T* dictp, T* end) {
|
|
for (; dictp != end; ++dictp) {
|
|
dictp->TraceDictionary(trc);
|
|
}
|
|
}
|
|
};
|
|
|
|
// sequence<SomeTypedArray>
|
|
template<typename T>
|
|
class SequenceTracer<T, false, true>
|
|
{
|
|
explicit SequenceTracer() MOZ_DELETE; // Should never be instantiated
|
|
|
|
public:
|
|
static void TraceSequence(JSTracer* trc, T* arrayp, T* end) {
|
|
for (; arrayp != end; ++arrayp) {
|
|
arrayp->TraceSelf(trc);
|
|
}
|
|
}
|
|
};
|
|
|
|
// sequence<T?> with T? being a Nullable<T>
|
|
template<typename T>
|
|
class SequenceTracer<Nullable<T>, false, false>
|
|
{
|
|
explicit SequenceTracer() MOZ_DELETE; // Should never be instantiated
|
|
|
|
public:
|
|
static void TraceSequence(JSTracer* trc, Nullable<T>* seqp,
|
|
Nullable<T>* end) {
|
|
for (; seqp != end; ++seqp) {
|
|
if (!seqp->IsNull()) {
|
|
// Pretend like we actually have a length-one sequence here so
|
|
// we can do template instantiation correctly for T.
|
|
T& val = seqp->Value();
|
|
T* ptr = &val;
|
|
SequenceTracer<T>::TraceSequence(trc, ptr, ptr+1);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
template<typename T>
|
|
void DoTraceSequence(JSTracer* trc, FallibleTArray<T>& seq)
|
|
{
|
|
SequenceTracer<T>::TraceSequence(trc, seq.Elements(),
|
|
seq.Elements() + seq.Length());
|
|
}
|
|
|
|
template<typename T>
|
|
void DoTraceSequence(JSTracer* trc, InfallibleTArray<T>& seq)
|
|
{
|
|
SequenceTracer<T>::TraceSequence(trc, seq.Elements(),
|
|
seq.Elements() + seq.Length());
|
|
}
|
|
|
|
// Rooter class for sequences; this is what we mostly use in the codegen
|
|
template<typename T>
|
|
class MOZ_STACK_CLASS SequenceRooter : private JS::CustomAutoRooter
|
|
{
|
|
public:
|
|
SequenceRooter(JSContext *aCx, FallibleTArray<T>* aSequence
|
|
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
|
|
: JS::CustomAutoRooter(aCx MOZ_GUARD_OBJECT_NOTIFIER_PARAM_TO_PARENT),
|
|
mFallibleArray(aSequence),
|
|
mSequenceType(eFallibleArray)
|
|
{
|
|
}
|
|
|
|
SequenceRooter(JSContext *aCx, InfallibleTArray<T>* aSequence
|
|
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
|
|
: JS::CustomAutoRooter(aCx MOZ_GUARD_OBJECT_NOTIFIER_PARAM_TO_PARENT),
|
|
mInfallibleArray(aSequence),
|
|
mSequenceType(eInfallibleArray)
|
|
{
|
|
}
|
|
|
|
SequenceRooter(JSContext *aCx, Nullable<nsTArray<T> >* aSequence
|
|
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
|
|
: JS::CustomAutoRooter(aCx MOZ_GUARD_OBJECT_NOTIFIER_PARAM_TO_PARENT),
|
|
mNullableArray(aSequence),
|
|
mSequenceType(eNullableArray)
|
|
{
|
|
}
|
|
|
|
private:
|
|
enum SequenceType {
|
|
eInfallibleArray,
|
|
eFallibleArray,
|
|
eNullableArray
|
|
};
|
|
|
|
virtual void trace(JSTracer *trc) MOZ_OVERRIDE
|
|
{
|
|
if (mSequenceType == eFallibleArray) {
|
|
DoTraceSequence(trc, *mFallibleArray);
|
|
} else if (mSequenceType == eInfallibleArray) {
|
|
DoTraceSequence(trc, *mInfallibleArray);
|
|
} else {
|
|
MOZ_ASSERT(mSequenceType == eNullableArray);
|
|
if (!mNullableArray->IsNull()) {
|
|
DoTraceSequence(trc, mNullableArray->Value());
|
|
}
|
|
}
|
|
}
|
|
|
|
union {
|
|
InfallibleTArray<T>* mInfallibleArray;
|
|
FallibleTArray<T>* mFallibleArray;
|
|
Nullable<nsTArray<T> >* mNullableArray;
|
|
};
|
|
|
|
SequenceType mSequenceType;
|
|
};
|
|
|
|
template<typename T>
|
|
class MOZ_STACK_CLASS RootedUnion : public T,
|
|
private JS::CustomAutoRooter
|
|
{
|
|
public:
|
|
RootedUnion(JSContext* cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM) :
|
|
T(),
|
|
JS::CustomAutoRooter(cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM_TO_PARENT)
|
|
{
|
|
}
|
|
|
|
virtual void trace(JSTracer *trc) MOZ_OVERRIDE
|
|
{
|
|
this->TraceUnion(trc);
|
|
}
|
|
};
|
|
|
|
template<typename T>
|
|
class MOZ_STACK_CLASS NullableRootedUnion : public Nullable<T>,
|
|
private JS::CustomAutoRooter
|
|
{
|
|
public:
|
|
NullableRootedUnion(JSContext* cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM) :
|
|
Nullable<T>(),
|
|
JS::CustomAutoRooter(cx MOZ_GUARD_OBJECT_NOTIFIER_PARAM_TO_PARENT)
|
|
{
|
|
}
|
|
|
|
virtual void trace(JSTracer *trc) MOZ_OVERRIDE
|
|
{
|
|
if (!this->IsNull()) {
|
|
this->Value().TraceUnion(trc);
|
|
}
|
|
}
|
|
};
|
|
|
|
inline bool
|
|
IdEquals(jsid id, const char* string)
|
|
{
|
|
return JSID_IS_STRING(id) &&
|
|
JS_FlatStringEqualsAscii(JSID_TO_FLAT_STRING(id), string);
|
|
}
|
|
|
|
inline bool
|
|
AddStringToIDVector(JSContext* cx, JS::AutoIdVector& vector, const char* name)
|
|
{
|
|
return vector.growBy(1) &&
|
|
InternJSString(cx, vector[vector.length() - 1], name);
|
|
}
|
|
|
|
// Implementation of the bits that XrayWrapper needs
|
|
|
|
/**
|
|
* This resolves indexed or named properties of obj.
|
|
*
|
|
* wrapper is the Xray JS object.
|
|
* obj is the target object of the Xray, a binding's instance object or a
|
|
* interface or interface prototype object.
|
|
*/
|
|
bool
|
|
XrayResolveOwnProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
|
|
JS::Handle<JSObject*> obj,
|
|
JS::Handle<jsid> id,
|
|
JS::MutableHandle<JSPropertyDescriptor> desc, unsigned flags);
|
|
|
|
/**
|
|
* This resolves operations, attributes and constants of the interfaces for obj.
|
|
*
|
|
* wrapper is the Xray JS object.
|
|
* obj is the target object of the Xray, a binding's instance object or a
|
|
* interface or interface prototype object.
|
|
*/
|
|
bool
|
|
XrayResolveNativeProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
|
|
JS::Handle<JSObject*> obj,
|
|
JS::Handle<jsid> id, JS::MutableHandle<JSPropertyDescriptor> desc);
|
|
|
|
/**
|
|
* Define a property on obj through an Xray wrapper.
|
|
*
|
|
* wrapper is the Xray JS object.
|
|
* obj is the target object of the Xray, a binding's instance object or a
|
|
* interface or interface prototype object.
|
|
* defined will be set to true if a property was set as a result of this call.
|
|
*/
|
|
bool
|
|
XrayDefineProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
|
|
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
|
|
JS::MutableHandle<JSPropertyDescriptor> desc, bool* defined);
|
|
|
|
/**
|
|
* This enumerates indexed or named properties of obj and operations, attributes
|
|
* and constants of the interfaces for obj.
|
|
*
|
|
* wrapper is the Xray JS object.
|
|
* obj is the target object of the Xray, a binding's instance object or a
|
|
* interface or interface prototype object.
|
|
* flags are JSITER_* flags.
|
|
*/
|
|
bool
|
|
XrayEnumerateProperties(JSContext* cx, JS::Handle<JSObject*> wrapper,
|
|
JS::Handle<JSObject*> obj,
|
|
unsigned flags, JS::AutoIdVector& props);
|
|
|
|
extern NativePropertyHooks sWorkerNativePropertyHooks;
|
|
|
|
// We use one constructor JSNative to represent all DOM interface objects (so
|
|
// we can easily detect when we need to wrap them in an Xray wrapper). We store
|
|
// the real JSNative in the mNative member of a JSNativeHolder in the
|
|
// CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT slot of the JSFunction object for a
|
|
// specific interface object. We also store the NativeProperties in the
|
|
// JSNativeHolder. The CONSTRUCTOR_XRAY_EXPANDO_SLOT is used to store the
|
|
// expando chain of the Xray for the interface object.
|
|
// Note that some interface objects are not yet a JSFunction but a normal
|
|
// JSObject with a DOMJSClass, those do not use these slots.
|
|
|
|
enum {
|
|
CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT = 0,
|
|
CONSTRUCTOR_XRAY_EXPANDO_SLOT
|
|
};
|
|
|
|
bool
|
|
Constructor(JSContext* cx, unsigned argc, JS::Value* vp);
|
|
|
|
inline bool
|
|
UseDOMXray(JSObject* obj)
|
|
{
|
|
const js::Class* clasp = js::GetObjectClass(obj);
|
|
return IsDOMClass(clasp) ||
|
|
IsDOMProxy(obj, clasp) ||
|
|
JS_IsNativeFunction(obj, Constructor) ||
|
|
IsDOMIfaceAndProtoClass(clasp);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
inline bool
|
|
HasConstructor(JSObject* obj)
|
|
{
|
|
return JS_IsNativeFunction(obj, Constructor) ||
|
|
js::GetObjectClass(obj)->construct;
|
|
}
|
|
#endif
|
|
|
|
// Transfer reference in ptr to smartPtr.
|
|
template<class T>
|
|
inline void
|
|
Take(nsRefPtr<T>& smartPtr, T* ptr)
|
|
{
|
|
smartPtr = dont_AddRef(ptr);
|
|
}
|
|
|
|
// Transfer ownership of ptr to smartPtr.
|
|
template<class T>
|
|
inline void
|
|
Take(nsAutoPtr<T>& smartPtr, T* ptr)
|
|
{
|
|
smartPtr = ptr;
|
|
}
|
|
|
|
inline void
|
|
MustInheritFromNonRefcountedDOMObject(NonRefcountedDOMObject*)
|
|
{
|
|
}
|
|
|
|
// Set the chain of expando objects for various consumers of the given object.
|
|
// For Paris Bindings only. See the relevant infrastructure in XrayWrapper.cpp.
|
|
JSObject* GetXrayExpandoChain(JSObject *obj);
|
|
void SetXrayExpandoChain(JSObject *obj, JSObject *chain);
|
|
|
|
/**
|
|
* This creates a JSString containing the value that the toString function for
|
|
* obj should create according to the WebIDL specification, ignoring any
|
|
* modifications by script. The value is prefixed with pre and postfixed with
|
|
* post, unless this is called for an object that has a stringifier. It is
|
|
* specifically for use by Xray code.
|
|
*
|
|
* wrapper is the Xray JS object.
|
|
* obj is the target object of the Xray, a binding's instance object or a
|
|
* interface or interface prototype object.
|
|
* pre is a string that should be prefixed to the value.
|
|
* post is a string that should be prefixed to the value.
|
|
* v contains the JSString for the value if the function returns true.
|
|
*/
|
|
bool
|
|
NativeToString(JSContext* cx, JS::Handle<JSObject*> wrapper,
|
|
JS::Handle<JSObject*> obj, const char* pre,
|
|
const char* post, JS::Value* v);
|
|
|
|
HAS_MEMBER(JSBindingFinalized)
|
|
|
|
template<class T, bool hasCallback=HasJSBindingFinalizedMember<T>::Value>
|
|
struct JSBindingFinalized
|
|
{
|
|
static void Finalized(T* self)
|
|
{
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
struct JSBindingFinalized<T, true>
|
|
{
|
|
static void Finalized(T* self)
|
|
{
|
|
self->JSBindingFinalized();
|
|
}
|
|
};
|
|
|
|
// Helpers for creating a const version of a type.
|
|
template<typename T>
|
|
const T& Constify(T& arg)
|
|
{
|
|
return arg;
|
|
}
|
|
|
|
// Helper for turning (Owning)NonNull<T> into T&
|
|
template<typename T>
|
|
T& NonNullHelper(T& aArg)
|
|
{
|
|
return aArg;
|
|
}
|
|
|
|
template<typename T>
|
|
T& NonNullHelper(NonNull<T>& aArg)
|
|
{
|
|
return aArg;
|
|
}
|
|
|
|
template<typename T>
|
|
const T& NonNullHelper(const NonNull<T>& aArg)
|
|
{
|
|
return aArg;
|
|
}
|
|
|
|
template<typename T>
|
|
T& NonNullHelper(OwningNonNull<T>& aArg)
|
|
{
|
|
return aArg;
|
|
}
|
|
|
|
template<typename T>
|
|
const T& NonNullHelper(const OwningNonNull<T>& aArg)
|
|
{
|
|
return aArg;
|
|
}
|
|
|
|
// Reparent the wrapper of aObj to whatever its native now thinks its
|
|
// parent should be.
|
|
nsresult
|
|
ReparentWrapper(JSContext* aCx, JS::HandleObject aObj);
|
|
|
|
/**
|
|
* Used to implement the hasInstance hook of an interface object.
|
|
*
|
|
* instance should not be a security wrapper.
|
|
*/
|
|
bool
|
|
InterfaceHasInstance(JSContext* cx, JS::Handle<JSObject*> obj,
|
|
JS::Handle<JSObject*> instance,
|
|
bool* bp);
|
|
bool
|
|
InterfaceHasInstance(JSContext* cx, JS::Handle<JSObject*> obj, JS::MutableHandle<JS::Value> vp,
|
|
bool* bp);
|
|
bool
|
|
InterfaceHasInstance(JSContext* cx, int prototypeID, int depth,
|
|
JS::Handle<JSObject*> instance,
|
|
bool* bp);
|
|
|
|
// Helper for lenient getters/setters to report to console. If this
|
|
// returns false, we couldn't even get a global.
|
|
bool
|
|
ReportLenientThisUnwrappingFailure(JSContext* cx, JSObject* obj);
|
|
|
|
inline JSObject*
|
|
GetUnforgeableHolder(JSObject* aGlobal, prototypes::ID aId)
|
|
{
|
|
JS::Heap<JSObject*>* protoAndIfaceArray = GetProtoAndIfaceArray(aGlobal);
|
|
JSObject* interfaceProto = protoAndIfaceArray[aId];
|
|
return &js::GetReservedSlot(interfaceProto,
|
|
DOM_INTERFACE_PROTO_SLOTS_BASE).toObject();
|
|
}
|
|
|
|
// Given a JSObject* that represents the chrome side of a JS-implemented WebIDL
|
|
// interface, get the nsPIDOMWindow corresponding to the content side, if any.
|
|
// A false return means an exception was thrown.
|
|
bool
|
|
GetWindowForJSImplementedObject(JSContext* cx, JS::Handle<JSObject*> obj,
|
|
nsPIDOMWindow** window);
|
|
|
|
already_AddRefed<nsPIDOMWindow>
|
|
ConstructJSImplementation(JSContext* aCx, const char* aContractId,
|
|
const GlobalObject& aGlobal,
|
|
JS::MutableHandle<JSObject*> aObject,
|
|
ErrorResult& aRv);
|
|
|
|
/**
|
|
* Convert an nsCString to jsval, returning true on success.
|
|
* These functions are intended for ByteString implementations.
|
|
* As such, the string is not UTF-8 encoded. Any UTF8 strings passed to these
|
|
* methods will be mangled.
|
|
*/
|
|
bool NonVoidByteStringToJsval(JSContext *cx, const nsACString &str,
|
|
JS::MutableHandle<JS::Value> rval);
|
|
inline bool ByteStringToJsval(JSContext *cx, const nsACString &str,
|
|
JS::MutableHandle<JS::Value> rval)
|
|
{
|
|
if (str.IsVoid()) {
|
|
rval.setNull();
|
|
return true;
|
|
}
|
|
return NonVoidByteStringToJsval(cx, str, rval);
|
|
}
|
|
|
|
template<class T, bool isISupports=IsBaseOf<nsISupports, T>::value>
|
|
struct PreserveWrapperHelper
|
|
{
|
|
static void PreserveWrapper(T* aObject)
|
|
{
|
|
aObject->PreserveWrapper(aObject, NS_CYCLE_COLLECTION_PARTICIPANT(T));
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
struct PreserveWrapperHelper<T, true>
|
|
{
|
|
static void PreserveWrapper(T* aObject)
|
|
{
|
|
aObject->PreserveWrapper(reinterpret_cast<nsISupports*>(aObject));
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
void PreserveWrapper(T* aObject)
|
|
{
|
|
PreserveWrapperHelper<T>::PreserveWrapper(aObject);
|
|
}
|
|
|
|
template<class T, bool isISupports=IsBaseOf<nsISupports, T>::value>
|
|
struct CastingAssertions
|
|
{
|
|
static bool ToSupportsIsCorrect(T*)
|
|
{
|
|
return true;
|
|
}
|
|
static bool ToSupportsIsOnPrimaryInheritanceChain(T*, nsWrapperCache*)
|
|
{
|
|
return true;
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
struct CastingAssertions<T, true>
|
|
{
|
|
static bool ToSupportsIsCorrect(T* aObject)
|
|
{
|
|
return ToSupports(aObject) == reinterpret_cast<nsISupports*>(aObject);
|
|
}
|
|
static bool ToSupportsIsOnPrimaryInheritanceChain(T* aObject,
|
|
nsWrapperCache* aCache)
|
|
{
|
|
return reinterpret_cast<void*>(aObject) != aCache;
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
bool
|
|
ToSupportsIsCorrect(T* aObject)
|
|
{
|
|
return CastingAssertions<T>::ToSupportsIsCorrect(aObject);
|
|
}
|
|
|
|
template<class T>
|
|
bool
|
|
ToSupportsIsOnPrimaryInheritanceChain(T* aObject, nsWrapperCache* aCache)
|
|
{
|
|
return CastingAssertions<T>::ToSupportsIsOnPrimaryInheritanceChain(aObject,
|
|
aCache);
|
|
}
|
|
|
|
template<class T, template <typename> class SmartPtr,
|
|
bool isISupports=IsBaseOf<nsISupports, T>::value>
|
|
class DeferredFinalizer
|
|
{
|
|
typedef nsTArray<SmartPtr<T> > SmartPtrArray;
|
|
|
|
static void*
|
|
AppendDeferredFinalizePointer(void* aData, void* aObject)
|
|
{
|
|
SmartPtrArray* pointers = static_cast<SmartPtrArray*>(aData);
|
|
if (!pointers) {
|
|
pointers = new SmartPtrArray();
|
|
}
|
|
|
|
T* self = static_cast<T*>(aObject);
|
|
|
|
SmartPtr<T>* defer = pointers->AppendElement();
|
|
Take(*defer, self);
|
|
return pointers;
|
|
}
|
|
static bool
|
|
DeferredFinalize(uint32_t aSlice, void* aData)
|
|
{
|
|
MOZ_ASSERT(aSlice > 0, "nonsensical/useless call with aSlice == 0");
|
|
SmartPtrArray* pointers = static_cast<SmartPtrArray*>(aData);
|
|
uint32_t oldLen = pointers->Length();
|
|
if (oldLen < aSlice) {
|
|
aSlice = oldLen;
|
|
}
|
|
uint32_t newLen = oldLen - aSlice;
|
|
pointers->RemoveElementsAt(newLen, aSlice);
|
|
if (newLen == 0) {
|
|
delete pointers;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
public:
|
|
static void
|
|
AddForDeferredFinalization(T* aObject)
|
|
{
|
|
cyclecollector::DeferredFinalize(AppendDeferredFinalizePointer,
|
|
DeferredFinalize, aObject);
|
|
}
|
|
};
|
|
|
|
template<class T, template <typename> class SmartPtr>
|
|
class DeferredFinalizer<T, SmartPtr, true>
|
|
{
|
|
public:
|
|
static void
|
|
AddForDeferredFinalization(T* aObject)
|
|
{
|
|
cyclecollector::DeferredFinalize(reinterpret_cast<nsISupports*>(aObject));
|
|
}
|
|
};
|
|
|
|
template<class T, template <typename> class SmartPtr>
|
|
static void
|
|
AddForDeferredFinalization(T* aObject)
|
|
{
|
|
DeferredFinalizer<T, SmartPtr>::AddForDeferredFinalization(aObject);
|
|
}
|
|
|
|
// This returns T's CC participant if it participates in CC or null if it
|
|
// doesn't. This also returns null for classes that don't inherit from
|
|
// nsISupports (QI should be used to get the participant for those).
|
|
template<class T, bool isISupports=IsBaseOf<nsISupports, T>::value>
|
|
class GetCCParticipant
|
|
{
|
|
// Helper for GetCCParticipant for classes that participate in CC.
|
|
template<class U>
|
|
static MOZ_CONSTEXPR nsCycleCollectionParticipant*
|
|
GetHelper(int, typename U::NS_CYCLE_COLLECTION_INNERCLASS* dummy=nullptr)
|
|
{
|
|
return T::NS_CYCLE_COLLECTION_INNERCLASS::GetParticipant();
|
|
}
|
|
// Helper for GetCCParticipant for classes that don't participate in CC.
|
|
template<class U>
|
|
static MOZ_CONSTEXPR nsCycleCollectionParticipant*
|
|
GetHelper(double)
|
|
{
|
|
return nullptr;
|
|
}
|
|
|
|
public:
|
|
static MOZ_CONSTEXPR nsCycleCollectionParticipant*
|
|
Get()
|
|
{
|
|
// Passing int() here will try to call the GetHelper that takes an int as
|
|
// its firt argument. If T doesn't participate in CC then substitution for
|
|
// the second argument (with a default value) will fail and because of
|
|
// SFINAE the next best match (the variant taking a double) will be called.
|
|
return GetHelper<T>(int());
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
class GetCCParticipant<T, true>
|
|
{
|
|
public:
|
|
static MOZ_CONSTEXPR nsCycleCollectionParticipant*
|
|
Get()
|
|
{
|
|
return nullptr;
|
|
}
|
|
};
|
|
|
|
bool
|
|
ThreadsafeCheckIsChrome(JSContext* aCx, JSObject* aObj);
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_dom_BindingUtils_h__ */
|