mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
47ff20f5dc
The changes in CastableObjectUnwrapper and CallbackObjectUnwrapper are basically reindentation. Similar for the actual conversion changes for all the non-interface types, though for those the actual declaration of the thing being converted to has moved out, since we may not be converting onto the stack.
667 lines
18 KiB
C++
667 lines
18 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 "mozilla/dom/DOMJSClass.h"
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#include "mozilla/dom/workers/Workers.h"
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#include "mozilla/ErrorResult.h"
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#include "jsapi.h"
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#include "jsfriendapi.h"
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#include "XPCQuickStubs.h"
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#include "XPCWrapper.h"
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#include "nsTraceRefcnt.h"
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#include "nsWrapperCacheInlines.h"
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// nsGlobalWindow implements nsWrapperCache, but doesn't always use it. Don't
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// try to use it without fixing that first.
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class nsGlobalWindow;
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namespace mozilla {
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namespace dom {
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template<bool mainThread>
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inline bool
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Throw(JSContext* cx, nsresult rv)
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{
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using mozilla::dom::workers::exceptions::ThrowDOMExceptionForNSResult;
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// XXX Introduce exception machinery.
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if (mainThread) {
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XPCThrower::Throw(rv, cx);
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} else {
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if (!JS_IsExceptionPending(cx)) {
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ThrowDOMExceptionForNSResult(cx, rv);
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}
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}
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return false;
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}
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template<bool mainThread>
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inline bool
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ThrowMethodFailedWithDetails(JSContext* cx, const ErrorResult& rv,
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const char* /* ifaceName */,
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const char* /* memberName */)
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{
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return Throw<mainThread>(cx, rv.ErrorCode());
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}
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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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template <class T>
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inline T*
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UnwrapDOMObject(JSObject* obj, const JSClass* clasp)
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{
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MOZ_ASSERT(IsDOMClass(clasp));
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MOZ_ASSERT(JS_GetClass(obj) == clasp);
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size_t slot = DOMJSClass::FromJSClass(clasp)->mNativeSlot;
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MOZ_ASSERT((slot == DOM_OBJECT_SLOT &&
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!(clasp->flags & JSCLASS_DOM_GLOBAL)) ||
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(slot == DOM_GLOBAL_OBJECT_SLOT &&
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(clasp->flags & JSCLASS_DOM_GLOBAL)));
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JS::Value val = js::GetReservedSlot(obj, slot);
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// XXXbz/khuey worker code tries to unwrap interface objects (which have
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// nothing here). That needs to stop.
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// XXX We don't null-check UnwrapObject's result; aren't we going to crash
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// anyway?
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if (val.isUndefined()) {
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return NULL;
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}
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return static_cast<T*>(val.toPrivate());
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}
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template <class T>
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inline T*
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UnwrapDOMObject(JSObject* obj, const js::Class* clasp)
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{
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return UnwrapDOMObject<T>(obj, Jsvalify(clasp));
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}
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// Some callers don't want to set an exception when unwrappin 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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template <prototypes::ID PrototypeID, class T>
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inline nsresult
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UnwrapObject(JSContext* cx, JSObject* obj, T** value)
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{
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/* First check to see whether we have a DOM object */
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JSClass* clasp = js::GetObjectJSClass(obj);
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if (!IsDOMClass(clasp)) {
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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 = XPCWrapper::Unwrap(cx, obj, 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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clasp = js::GetObjectJSClass(obj);
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if (!IsDOMClass(clasp)) {
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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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MOZ_ASSERT(IsDOMClass(clasp));
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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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DOMJSClass* domClass = DOMJSClass::FromJSClass(clasp);
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if (domClass->mInterfaceChain[PrototypeTraits<PrototypeID>::Depth] ==
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PrototypeID) {
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*value = UnwrapDOMObject<T>(obj, clasp);
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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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IsArrayLike(JSContext* cx, JSObject* obj)
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{
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MOZ_ASSERT(obj);
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// For simplicity, check for security wrappers up front
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if (js::IsWrapper(obj)) {
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obj = XPCWrapper::Unwrap(cx, obj, false);
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if (!obj) {
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// Let's say it's not
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return false;
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}
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}
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// XXXbz need to detect platform objects (including listbinding
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// ones) with indexGetters here!
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return JS_IsArrayObject(cx, obj);
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}
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inline bool
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IsPlatformObject(JSContext* cx, JSObject* obj)
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{
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// XXXbz Should be treating list-binding objects as platform objects
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// too? The one consumer so far wants non-array-like platform
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// objects, so listbindings that have an indexGetter should test
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// false from here. Maybe this function should have a different
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// name?
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MOZ_ASSERT(obj);
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// Fast-path the common case
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JSClass* clasp = js::GetObjectJSClass(obj);
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if (IsDOMClass(clasp)) {
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return true;
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}
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// Now for simplicity check for security wrappers before anything else
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if (js::IsWrapper(obj)) {
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obj = XPCWrapper::Unwrap(cx, obj, false);
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if (!obj) {
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// Let's say it's not
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return false;
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}
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clasp = js::GetObjectJSClass(obj);
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}
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return IS_WRAPPER_CLASS(js::Valueify(clasp)) || IsDOMClass(clasp) ||
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JS_IsArrayBufferObject(obj, cx);
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}
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template <class T>
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inline nsresult
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UnwrapObject(JSContext* cx, JSObject* obj, T* *value)
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{
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return UnwrapObject<static_cast<prototypes::ID>(
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PrototypeIDMap<T>::PrototypeID)>(cx, obj, value);
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}
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const size_t kProtoOrIfaceCacheCount =
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prototypes::id::_ID_Count + constructors::id::_ID_Count;
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inline void
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AllocateProtoOrIfaceCache(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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// Important: The () at the end ensure zero-initialization
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JSObject** protoOrIfaceArray = new JSObject*[kProtoOrIfaceCacheCount]();
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js::SetReservedSlot(obj, DOM_PROTOTYPE_SLOT,
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JS::PrivateValue(protoOrIfaceArray));
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}
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inline void
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TraceProtoOrIfaceCache(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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JSObject** protoOrIfaceArray = GetProtoOrIfaceArray(obj);
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for (size_t i = 0; i < kProtoOrIfaceCacheCount; ++i) {
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JSObject* proto = protoOrIfaceArray[i];
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if (proto) {
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JS_CALL_OBJECT_TRACER(trc, proto, "protoOrIfaceArray[i]");
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}
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}
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}
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inline void
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DestroyProtoOrIfaceCache(JSObject* obj)
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{
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MOZ_ASSERT(js::GetObjectClass(obj)->flags & JSCLASS_DOM_GLOBAL);
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JSObject** protoOrIfaceArray = GetProtoOrIfaceArray(obj);
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delete [] protoOrIfaceArray;
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}
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struct ConstantSpec
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{
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const char* name;
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JS::Value value;
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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, JSObject* obj, ConstantSpec* cs);
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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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* receiver is the object on which we need to define the interface object as a
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* property
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* protoProto is the prototype to use for the interface prototype 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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* 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 is the JSNative to use as a constructor. If this is non-null, it
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* should be used as a JSNative to back the interface object, which
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* should be a Function. If this is null, then we should create an
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* object of constructorClass, unless that's also null, in which
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* case 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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* methods and properties are to be defined on the interface prototype object;
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* these arguments are allowed to be null if there are no
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* methods or properties respectively.
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* constants are to be defined on the interface object and on the interface
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* prototype object; allowed to be null if there are no constants.
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* staticMethods are to be defined on the interface object; allowed to be null
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* if there are no static methods.
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*
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* At least one of protoClass and constructorClass should be non-null.
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* If constructorClass is non-null, the resulting interface object will be
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* defined on the given global with property name |name|, which must also be
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* non-null.
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*
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* returns the interface prototype object if protoClass is non-null, else it
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* returns the interface object.
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*/
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JSObject*
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CreateInterfaceObjects(JSContext* cx, JSObject* global, JSObject* receiver,
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JSObject* protoProto, JSClass* protoClass,
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JSClass* constructorClass, JSNative constructor,
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unsigned ctorNargs, JSFunctionSpec* methods,
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JSPropertySpec* properties, ConstantSpec* constants,
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JSFunctionSpec* staticMethods, const char* name);
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template <class T>
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inline bool
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WrapNewBindingObject(JSContext* cx, JSObject* scope, T* value, JS::Value* vp)
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{
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JSObject* obj = value->GetWrapper();
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if (obj && js::GetObjectCompartment(obj) == js::GetObjectCompartment(scope)) {
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*vp = JS::ObjectValue(*obj);
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return true;
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}
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if (!obj) {
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bool triedToWrap;
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obj = value->WrapObject(cx, scope, &triedToWrap);
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if (!obj) {
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// At this point, obj is null, so just return false. We could
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// try to communicate triedToWrap to the caller, but in practice
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// callers seem to be testing JS_IsExceptionPending(cx) to
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// figure out whether WrapObject() threw instead.
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return false;
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}
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}
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// When called via XrayWrapper, we end up here while running in the
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// chrome compartment. But the obj we have would be created in
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// whatever the content compartment is. So at this point we need to
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// make sure it's correctly wrapped for the compartment of |scope|.
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// cx should already be in the compartment of |scope| here.
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MOZ_ASSERT(js::IsObjectInContextCompartment(scope, cx));
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*vp = JS::ObjectValue(*obj);
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return JS_WrapValue(cx, vp);
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}
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// Helper for smart pointers (nsAutoPtr/nsRefPtr/nsCOMPtr).
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template <template <class> class SmartPtr, class T>
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inline bool
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WrapNewBindingObject(JSContext* cx, JSObject* scope, const SmartPtr<T>& value,
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JS::Value* vp)
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{
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return WrapNewBindingObject(cx, scope, value.get(), vp);
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}
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/**
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* A method to handle new-binding wrap failure, by possibly falling back to
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* wrapping as a non-new-binding object.
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*/
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bool
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DoHandleNewBindingWrappingFailure(JSContext* cx, JSObject* scope,
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nsISupports* value, JS::Value* vp);
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/**
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* An easy way to call the above when you have a value which
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* multiply-inherits from nsISupports.
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*/
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template <class T>
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bool
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HandleNewBindingWrappingFailure(JSContext* cx, JSObject* scope, T* value,
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JS::Value* vp)
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{
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nsCOMPtr<nsISupports> val;
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CallQueryInterface(value, getter_AddRefs(val));
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return DoHandleNewBindingWrappingFailure(cx, scope, val, vp);
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}
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// Helper for smart pointers (nsAutoPtr/nsRefPtr/nsCOMPtr).
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template <template <class> class SmartPtr, class T>
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MOZ_ALWAYS_INLINE bool
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HandleNewBindingWrappingFailure(JSContext* cx, JSObject* scope,
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const SmartPtr<T>& value, JS::Value* vp)
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{
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return HandleNewBindingWrappingFailure(cx, scope, value.get(), vp);
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}
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struct EnumEntry {
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const char* value;
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size_t length;
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};
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inline int
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FindEnumStringIndex(JSContext* cx, JS::Value v, const EnumEntry* values, bool* ok)
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{
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// JS_StringEqualsAscii is slow as molasses, so don't use it here.
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JSString* str = JS_ValueToString(cx, v);
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if (!str) {
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*ok = false;
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return 0;
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}
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JS::Anchor<JSString*> anchor(str);
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size_t length;
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const jschar* chars = JS_GetStringCharsAndLength(cx, str, &length);
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if (!chars) {
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*ok = false;
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return 0;
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}
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int i = 0;
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for (const EnumEntry* value = values; value->value; ++value, ++i) {
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if (length != value->length) {
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continue;
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}
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bool equal = true;
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const char* val = value->value;
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for (size_t j = 0; j != length; ++j) {
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if (unsigned(val[j]) != unsigned(chars[j])) {
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equal = false;
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break;
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}
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}
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if (equal) {
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*ok = true;
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return i;
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}
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}
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// XXX we don't know whether we're on the main thread, so play it safe
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*ok = Throw<false>(cx, NS_ERROR_XPC_BAD_CONVERT_JS);
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return 0;
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}
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inline nsWrapperCache*
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GetWrapperCache(nsWrapperCache* cache)
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{
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return cache;
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}
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inline nsWrapperCache*
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GetWrapperCache(nsGlobalWindow* not_allowed);
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inline nsWrapperCache*
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GetWrapperCache(void* p)
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{
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return NULL;
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}
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struct ParentObject {
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template<class T>
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ParentObject(T* aObject) :
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mObject(aObject),
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mWrapperCache(GetWrapperCache(aObject))
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{}
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template<class T, template<class> class SmartPtr>
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ParentObject(const SmartPtr<T>& aObject) :
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mObject(aObject.get()),
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mWrapperCache(GetWrapperCache(aObject.get()))
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{}
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ParentObject(nsISupports* aObject, nsWrapperCache* aCache) :
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mObject(aObject),
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mWrapperCache(aCache)
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{}
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nsISupports* const mObject;
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nsWrapperCache* const mWrapperCache;
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};
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inline nsWrapperCache*
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GetWrapperCache(const ParentObject& aParentObject)
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{
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return aParentObject.mWrapperCache;
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}
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template<class T>
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inline nsISupports*
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GetParentPointer(T* aObject)
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{
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return aObject;
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}
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inline nsISupports*
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GetParentPointer(const ParentObject& aObject)
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{
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return aObject.mObject;
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}
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// Only set allowNativeWrapper to false if you really know you need it, if in
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// doubt use true. Setting it to false disables security wrappers.
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bool
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XPCOMObjectToJsval(JSContext* cx, JSObject* scope, xpcObjectHelper &helper,
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const nsIID* iid, bool allowNativeWrapper, JS::Value* rval);
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template<class T>
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inline bool
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WrapObject(JSContext* cx, JSObject* scope, T* p, nsWrapperCache* cache,
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const nsIID* iid, JS::Value* vp)
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{
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if (xpc_FastGetCachedWrapper(cache, scope, vp))
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return true;
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qsObjectHelper helper(p, cache);
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return XPCOMObjectToJsval(cx, scope, helper, iid, true, vp);
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}
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template<class T>
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inline bool
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WrapObject(JSContext* cx, JSObject* scope, T* p, const nsIID* iid,
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JS::Value* vp)
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{
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return WrapObject(cx, scope, p, GetWrapperCache(p), iid, vp);
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}
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template<class T>
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inline bool
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WrapObject(JSContext* cx, JSObject* scope, T* p, JS::Value* vp)
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{
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return WrapObject(cx, scope, p, NULL, vp);
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}
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template<class T>
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inline bool
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WrapObject(JSContext* cx, JSObject* scope, nsCOMPtr<T> &p, const nsIID* iid,
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JS::Value* vp)
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{
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return WrapObject(cx, scope, p.get(), iid, vp);
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}
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template<class T>
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inline bool
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WrapObject(JSContext* cx, JSObject* scope, nsCOMPtr<T> &p, JS::Value* vp)
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{
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return WrapObject(cx, scope, p, NULL, vp);
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}
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template<class T>
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inline bool
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WrapObject(JSContext* cx, JSObject* scope, nsRefPtr<T> &p, const nsIID* iid,
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JS::Value* vp)
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{
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return WrapObject(cx, scope, p.get(), iid, vp);
|
|
}
|
|
|
|
template<class T>
|
|
inline bool
|
|
WrapObject(JSContext* cx, JSObject* scope, nsRefPtr<T> &p, JS::Value* vp)
|
|
{
|
|
return WrapObject(cx, scope, p, NULL, vp);
|
|
}
|
|
|
|
template<>
|
|
inline bool
|
|
WrapObject<JSObject>(JSContext* cx, JSObject* scope, JSObject* p, JS::Value* vp)
|
|
{
|
|
vp->setObjectOrNull(p);
|
|
return true;
|
|
}
|
|
|
|
template<typename T>
|
|
static inline JSObject*
|
|
WrapNativeParent(JSContext* cx, JSObject* scope, const T& p)
|
|
{
|
|
if (!GetParentPointer(p))
|
|
return scope;
|
|
|
|
nsWrapperCache* cache = GetWrapperCache(p);
|
|
JSObject* obj;
|
|
if (cache && (obj = cache->GetWrapper())) {
|
|
#ifdef DEBUG
|
|
qsObjectHelper helper(GetParentPointer(p), cache);
|
|
JS::Value debugVal;
|
|
|
|
bool ok = XPCOMObjectToJsval(cx, scope, helper, NULL, false, &debugVal);
|
|
NS_ASSERTION(ok && JSVAL_TO_OBJECT(debugVal) == obj,
|
|
"Unexpected object in nsWrapperCache");
|
|
#endif
|
|
return obj;
|
|
}
|
|
|
|
qsObjectHelper helper(GetParentPointer(p), cache);
|
|
JS::Value v;
|
|
return XPCOMObjectToJsval(cx, scope, helper, NULL, false, &v) ?
|
|
JSVAL_TO_OBJECT(v) :
|
|
NULL;
|
|
}
|
|
|
|
// Spec needs a name property
|
|
template <typename Spec>
|
|
static bool
|
|
InitIds(JSContext* cx, Spec* specs, jsid* ids)
|
|
{
|
|
Spec* spec = specs;
|
|
do {
|
|
JSString *str = ::JS_InternString(cx, spec->name);
|
|
if (!str) {
|
|
return false;
|
|
}
|
|
|
|
*ids = INTERNED_STRING_TO_JSID(cx, str);
|
|
} while (++ids, (++spec)->name);
|
|
|
|
return true;
|
|
}
|
|
|
|
JSBool
|
|
QueryInterface(JSContext* cx, unsigned argc, JS::Value* vp);
|
|
JSBool
|
|
ThrowingConstructor(JSContext* cx, unsigned argc, JS::Value* vp);
|
|
JSBool
|
|
ThrowingConstructorWorkers(JSContext* cx, unsigned argc, JS::Value* vp);
|
|
|
|
template<class T>
|
|
class NonNull
|
|
{
|
|
public:
|
|
NonNull()
|
|
#ifdef DEBUG
|
|
: inited(false)
|
|
#endif
|
|
{}
|
|
|
|
operator T&() {
|
|
MOZ_ASSERT(inited);
|
|
MOZ_ASSERT(ptr, "NonNull<T> was set to null");
|
|
return *ptr;
|
|
}
|
|
|
|
void operator=(T* t) {
|
|
ptr = t;
|
|
MOZ_ASSERT(ptr);
|
|
#ifdef DEBUG
|
|
inited = true;
|
|
#endif
|
|
}
|
|
|
|
T** Slot() {
|
|
#ifdef DEBUG
|
|
inited = true;
|
|
#endif
|
|
return &ptr;
|
|
}
|
|
|
|
protected:
|
|
T* ptr;
|
|
#ifdef DEBUG
|
|
bool inited;
|
|
#endif
|
|
};
|
|
|
|
template<class T>
|
|
class OwningNonNull
|
|
{
|
|
public:
|
|
OwningNonNull()
|
|
#ifdef DEBUG
|
|
: inited(false)
|
|
#endif
|
|
{}
|
|
|
|
operator T&() {
|
|
MOZ_ASSERT(inited);
|
|
MOZ_ASSERT(ptr, "OwningNonNull<T> was set to null");
|
|
return *ptr;
|
|
}
|
|
|
|
void operator=(T* t) {
|
|
init(t);
|
|
}
|
|
|
|
void operator=(const already_AddRefed<T>& t) {
|
|
init(t);
|
|
}
|
|
|
|
protected:
|
|
template<typename U>
|
|
void init(U t) {
|
|
ptr = t;
|
|
MOZ_ASSERT(ptr);
|
|
#ifdef DEBUG
|
|
inited = true;
|
|
#endif
|
|
}
|
|
|
|
nsRefPtr<T> ptr;
|
|
#ifdef DEBUG
|
|
bool inited;
|
|
#endif
|
|
};
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_dom_BindingUtils_h__ */
|