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gecko/dom/bindings/BindingUtils.cpp
Boris Zbarsky 0307d91885 Bug 865951. If the return value of a JS-implemented method or attribute is a JS-implemented interface and the returned object is not a DOM object, automatically wrap it up in an instance of that interface. r=mccr8 
This does not invoke __init on the chrome object, since there are no
arguments to do it with anyway.  It also doesn't invoke init(), so
don't do this in cases in which the chrome-side object will need to
know its window.
2013-05-20 13:47:08 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
/* vim: set ts=2 sw=2 et tw=79: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <algorithm>
#include <stdarg.h>
#include "mozilla/DebugOnly.h"
#include "mozilla/FloatingPoint.h"
#include "BindingUtils.h"
#include "AccessCheck.h"
#include "nsContentUtils.h"
#include "nsIXPConnect.h"
#include "WrapperFactory.h"
#include "xpcprivate.h"
#include "XPCQuickStubs.h"
#include "XrayWrapper.h"
#include "jsfriendapi.h"
#include "mozilla/dom/HTMLObjectElement.h"
#include "mozilla/dom/HTMLObjectElementBinding.h"
#include "mozilla/dom/HTMLSharedObjectElement.h"
#include "mozilla/dom/HTMLEmbedElementBinding.h"
#include "mozilla/dom/HTMLAppletElementBinding.h"
namespace mozilla {
namespace dom {
JSErrorFormatString ErrorFormatString[] = {
#define MSG_DEF(_name, _argc, _str) \
{ _str, _argc, JSEXN_TYPEERR },
#include "mozilla/dom/Errors.msg"
#undef MSG_DEF
};
const JSErrorFormatString*
GetErrorMessage(void* aUserRef, const char* aLocale,
const unsigned aErrorNumber)
{
MOZ_ASSERT(aErrorNumber < ArrayLength(ErrorFormatString));
return &ErrorFormatString[aErrorNumber];
}
bool
ThrowErrorMessage(JSContext* aCx, const ErrNum aErrorNumber, ...)
{
va_list ap;
va_start(ap, aErrorNumber);
JS_ReportErrorNumberVA(aCx, GetErrorMessage, NULL,
static_cast<const unsigned>(aErrorNumber), ap);
va_end(ap);
return false;
}
} // namespace dom
struct ErrorResult::Message {
nsTArray<nsString> mArgs;
dom::ErrNum mErrorNumber;
};
void
ErrorResult::ThrowTypeError(const dom::ErrNum errorNumber, ...)
{
va_list ap;
va_start(ap, errorNumber);
if (IsJSException()) {
// We have rooted our mJSException, and we don't have the info
// needed to unroot here, so just bail.
va_end(ap);
MOZ_ASSERT(false,
"Ignoring ThrowTypeError call because we have a JS exception");
return;
}
if (IsTypeError()) {
delete mMessage;
}
mResult = NS_ERROR_TYPE_ERR;
Message* message = new Message();
message->mErrorNumber = errorNumber;
uint16_t argCount =
dom::GetErrorMessage(nullptr, nullptr, errorNumber)->argCount;
MOZ_ASSERT(argCount <= 10);
argCount = std::min<uint16_t>(argCount, 10);
while (argCount--) {
message->mArgs.AppendElement(*va_arg(ap, nsString*));
}
mMessage = message;
va_end(ap);
}
void
ErrorResult::ReportTypeError(JSContext* aCx)
{
MOZ_ASSERT(mMessage, "ReportTypeError() can be called only once");
Message* message = mMessage;
const uint32_t argCount = message->mArgs.Length();
const jschar* args[11];
for (uint32_t i = 0; i < argCount; ++i) {
args[i] = message->mArgs.ElementAt(i).get();
}
args[argCount] = nullptr;
JS_ReportErrorNumberUCArray(aCx, dom::GetErrorMessage, nullptr,
static_cast<const unsigned>(message->mErrorNumber),
argCount > 0 ? args : nullptr);
ClearMessage();
}
void
ErrorResult::ClearMessage()
{
if (IsTypeError()) {
delete mMessage;
mMessage = nullptr;
}
}
void
ErrorResult::ThrowJSException(JSContext* cx, JS::Handle<JS::Value> exn)
{
MOZ_ASSERT(mMightHaveUnreportedJSException,
"Why didn't you tell us you planned to throw a JS exception?");
if (IsTypeError()) {
delete mMessage;
}
// Make sure mJSException is initialized _before_ we try to root it. But
// don't set it to exn yet, because we don't want to do that until after we
// root.
mJSException = JS::UndefinedValue();
if (!JS_AddNamedValueRoot(cx, &mJSException, "ErrorResult::mJSException")) {
// Don't use NS_ERROR_DOM_JS_EXCEPTION, because that indicates we have
// in fact rooted mJSException.
mResult = NS_ERROR_OUT_OF_MEMORY;
} else {
mJSException = exn;
mResult = NS_ERROR_DOM_JS_EXCEPTION;
}
}
void
ErrorResult::ReportJSException(JSContext* cx)
{
MOZ_ASSERT(!mMightHaveUnreportedJSException,
"Why didn't you tell us you planned to handle JS exceptions?");
if (JS_WrapValue(cx, &mJSException)) {
JS_SetPendingException(cx, mJSException);
}
// If JS_WrapValue failed, not much we can do about it... No matter
// what, go ahead and unroot mJSException.
JS_RemoveValueRoot(cx, &mJSException);
}
namespace dom {
bool
DefineConstants(JSContext* cx, JS::Handle<JSObject*> obj,
const ConstantSpec* cs)
{
for (; cs->name; ++cs) {
JSBool ok =
JS_DefineProperty(cx, obj, cs->name, cs->value, NULL, NULL,
JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT);
if (!ok) {
return false;
}
}
return true;
}
static inline bool
Define(JSContext* cx, JS::Handle<JSObject*> obj, const JSFunctionSpec* spec) {
return JS_DefineFunctions(cx, obj, spec);
}
static inline bool
Define(JSContext* cx, JS::Handle<JSObject*> obj, const JSPropertySpec* spec) {
return JS_DefineProperties(cx, obj, spec);
}
static inline bool
Define(JSContext* cx, JS::Handle<JSObject*> obj, const ConstantSpec* spec) {
return DefineConstants(cx, obj, spec);
}
template<typename T>
bool
DefinePrefable(JSContext* cx, JS::Handle<JSObject*> obj,
const Prefable<T>* props)
{
MOZ_ASSERT(props);
MOZ_ASSERT(props->specs);
do {
// Define if enabled
if (props->isEnabled(cx, obj)) {
if (!Define(cx, obj, props->specs)) {
return false;
}
}
} while ((++props)->specs);
return true;
}
bool
DefineUnforgeableAttributes(JSContext* cx, JS::Handle<JSObject*> obj,
const Prefable<const JSPropertySpec>* props)
{
return DefinePrefable(cx, obj, props);
}
// We should use JSFunction objects for interface objects, but we need a custom
// hasInstance hook because we have new interface objects on prototype chains of
// old (XPConnect-based) bindings. Because Function.prototype.toString throws if
// passed a non-Function object we also need to provide our own toString method
// for interface objects.
enum {
TOSTRING_CLASS_RESERVED_SLOT = 0,
TOSTRING_NAME_RESERVED_SLOT = 1
};
JSBool
InterfaceObjectToString(JSContext* cx, unsigned argc, JS::Value *vp)
{
JS::Rooted<JSObject*> callee(cx, JSVAL_TO_OBJECT(JS_CALLEE(cx, vp)));
JS::Rooted<JSObject*> obj(cx, JS_THIS_OBJECT(cx, vp));
if (!obj) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_CONVERT_TO,
"null", "object");
return false;
}
JS::Value v = js::GetFunctionNativeReserved(callee,
TOSTRING_CLASS_RESERVED_SLOT);
JSClass* clasp = static_cast<JSClass*>(JSVAL_TO_PRIVATE(v));
v = js::GetFunctionNativeReserved(callee, TOSTRING_NAME_RESERVED_SLOT);
JSString* jsname = static_cast<JSString*>(JSVAL_TO_STRING(v));
size_t length;
const jschar* name = JS_GetInternedStringCharsAndLength(jsname, &length);
if (js::GetObjectJSClass(obj) != clasp) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_INCOMPATIBLE_PROTO,
NS_ConvertUTF16toUTF8(name).get(), "toString",
"object");
return false;
}
nsString str;
str.AppendLiteral("function ");
str.Append(name, length);
str.AppendLiteral("() {");
str.Append('\n');
str.AppendLiteral(" [native code]");
str.Append('\n');
str.AppendLiteral("}");
return xpc::NonVoidStringToJsval(cx, str, vp);
}
JSBool
Constructor(JSContext* cx, unsigned argc, JS::Value* vp)
{
JSObject* callee = JSVAL_TO_OBJECT(JS_CALLEE(cx, vp));
const JS::Value& v =
js::GetFunctionNativeReserved(callee,
CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT);
const JSNativeHolder* nativeHolder =
static_cast<const JSNativeHolder*>(v.toPrivate());
return (nativeHolder->mNative)(cx, argc, vp);
}
static JSObject*
CreateConstructor(JSContext* cx, JS::Handle<JSObject*> global, const char* name,
const JSNativeHolder* nativeHolder, unsigned ctorNargs)
{
JSFunction* fun = js::NewFunctionWithReserved(cx, Constructor, ctorNargs,
JSFUN_CONSTRUCTOR, global,
name);
if (!fun) {
return nullptr;
}
JSObject* constructor = JS_GetFunctionObject(fun);
js::SetFunctionNativeReserved(constructor,
CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT,
js::PrivateValue(const_cast<JSNativeHolder*>(nativeHolder)));
return constructor;
}
static bool
DefineConstructor(JSContext* cx, JS::Handle<JSObject*> global, const char* name,
JS::Handle<JSObject*> constructor)
{
JSBool alreadyDefined;
if (!JS_AlreadyHasOwnProperty(cx, global, name, &alreadyDefined)) {
return false;
}
// This is Enumerable: False per spec.
return alreadyDefined ||
JS_DefineProperty(cx, global, name, OBJECT_TO_JSVAL(constructor),
nullptr, nullptr, 0);
}
static JSObject*
CreateInterfaceObject(JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> constructorProto,
JSClass* constructorClass,
const JSNativeHolder* constructorNative,
unsigned ctorNargs, const NamedConstructor* namedConstructors,
JS::Handle<JSObject*> proto,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties,
const char* name)
{
JS::Rooted<JSObject*> constructor(cx);
if (constructorClass) {
MOZ_ASSERT(constructorProto);
constructor = JS_NewObject(cx, constructorClass, constructorProto, global);
} else {
MOZ_ASSERT(constructorNative);
MOZ_ASSERT(constructorProto == JS_GetFunctionPrototype(cx, global));
constructor = CreateConstructor(cx, global, name, constructorNative,
ctorNargs);
}
if (!constructor) {
return NULL;
}
if (constructorClass) {
// Have to shadow Function.prototype.toString, since that throws
// on things that are not js::FunctionClass.
JS::Rooted<JSFunction*> toString(cx,
js::DefineFunctionWithReserved(cx, constructor,
"toString",
InterfaceObjectToString,
0, 0));
if (!toString) {
return NULL;
}
JSString *str = ::JS_InternString(cx, name);
if (!str) {
return NULL;
}
JSObject* toStringObj = JS_GetFunctionObject(toString);
js::SetFunctionNativeReserved(toStringObj, TOSTRING_CLASS_RESERVED_SLOT,
PRIVATE_TO_JSVAL(constructorClass));
js::SetFunctionNativeReserved(toStringObj, TOSTRING_NAME_RESERVED_SLOT,
STRING_TO_JSVAL(str));
if (!JS_DefineProperty(cx, constructor, "length", JS::Int32Value(ctorNargs),
nullptr, nullptr, JSPROP_READONLY | JSPROP_PERMANENT)) {
return NULL;
}
}
if (properties) {
if (properties->staticMethods &&
!DefinePrefable(cx, constructor, properties->staticMethods)) {
return nullptr;
}
if (properties->staticAttributes &&
!DefinePrefable(cx, constructor, properties->staticAttributes)) {
return nullptr;
}
if (properties->constants &&
!DefinePrefable(cx, constructor, properties->constants)) {
return nullptr;
}
}
if (chromeOnlyProperties) {
if (chromeOnlyProperties->staticMethods &&
!DefinePrefable(cx, constructor, chromeOnlyProperties->staticMethods)) {
return nullptr;
}
if (chromeOnlyProperties->staticAttributes &&
!DefinePrefable(cx, constructor,
chromeOnlyProperties->staticAttributes)) {
return nullptr;
}
if (chromeOnlyProperties->constants &&
!DefinePrefable(cx, constructor, chromeOnlyProperties->constants)) {
return nullptr;
}
}
if (proto && !JS_LinkConstructorAndPrototype(cx, constructor, proto)) {
return NULL;
}
if (!DefineConstructor(cx, global, name, constructor)) {
return nullptr;
}
if (namedConstructors) {
int namedConstructorSlot = DOM_INTERFACE_SLOTS_BASE;
while (namedConstructors->mName) {
JS::Rooted<JSObject*> namedConstructor(cx,
CreateConstructor(cx, global, namedConstructors->mName,
&namedConstructors->mHolder,
namedConstructors->mNargs));
if (!namedConstructor ||
!JS_DefineProperty(cx, namedConstructor, "prototype",
JS::ObjectValue(*proto), JS_PropertyStub,
JS_StrictPropertyStub,
JSPROP_PERMANENT | JSPROP_READONLY) ||
!DefineConstructor(cx, global, namedConstructors->mName,
namedConstructor)) {
return nullptr;
}
js::SetReservedSlot(constructor, namedConstructorSlot++,
JS::ObjectValue(*namedConstructor));
++namedConstructors;
}
}
return constructor;
}
bool
DefineWebIDLBindingPropertiesOnXPCProto(JSContext* cx,
JS::Handle<JSObject*> proto,
const NativeProperties* properties)
{
if (properties->methods &&
!DefinePrefable(cx, proto, properties->methods)) {
return false;
}
if (properties->attributes &&
!DefinePrefable(cx, proto, properties->attributes)) {
return false;
}
return true;
}
static JSObject*
CreateInterfacePrototypeObject(JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> parentProto,
JSClass* protoClass,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties)
{
JS::Rooted<JSObject*> ourProto(cx,
JS_NewObjectWithUniqueType(cx, protoClass, parentProto, global));
if (!ourProto) {
return NULL;
}
if (properties) {
if (properties->methods &&
!DefinePrefable(cx, ourProto, properties->methods)) {
return nullptr;
}
if (properties->attributes &&
!DefinePrefable(cx, ourProto, properties->attributes)) {
return nullptr;
}
if (properties->constants &&
!DefinePrefable(cx, ourProto, properties->constants)) {
return nullptr;
}
}
if (chromeOnlyProperties) {
if (chromeOnlyProperties->methods &&
!DefinePrefable(cx, ourProto, chromeOnlyProperties->methods)) {
return nullptr;
}
if (chromeOnlyProperties->attributes &&
!DefinePrefable(cx, ourProto, chromeOnlyProperties->attributes)) {
return nullptr;
}
if (chromeOnlyProperties->constants &&
!DefinePrefable(cx, ourProto, chromeOnlyProperties->constants)) {
return nullptr;
}
}
return ourProto;
}
void
CreateInterfaceObjects(JSContext* cx, JS::Handle<JSObject*> global,
JS::Handle<JSObject*> protoProto,
JSClass* protoClass, JSObject** protoCache,
JS::Handle<JSObject*> constructorProto,
JSClass* constructorClass, const JSNativeHolder* constructor,
unsigned ctorNargs, const NamedConstructor* namedConstructors,
JSObject** constructorCache, const DOMClass* domClass,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties,
const char* name)
{
MOZ_ASSERT(protoClass || constructorClass || constructor,
"Need at least one class or a constructor!");
MOZ_ASSERT(!((properties &&
(properties->methods || properties->attributes)) ||
(chromeOnlyProperties &&
(chromeOnlyProperties->methods ||
chromeOnlyProperties->attributes))) || protoClass,
"Methods or properties but no protoClass!");
MOZ_ASSERT(!((properties &&
(properties->staticMethods || properties->staticAttributes)) ||
(chromeOnlyProperties &&
(chromeOnlyProperties->staticMethods ||
chromeOnlyProperties->staticAttributes))) ||
constructorClass || constructor,
"Static methods but no constructorClass or constructor!");
MOZ_ASSERT(bool(name) == bool(constructorClass || constructor),
"Must have name precisely when we have an interface object");
MOZ_ASSERT(!constructorClass || !constructor);
MOZ_ASSERT(!protoClass == !protoCache,
"If, and only if, there is an interface prototype object we need "
"to cache it");
MOZ_ASSERT(!(constructorClass || constructor) == !constructorCache,
"If, and only if, there is an interface object we need to cache "
"it");
JS::Rooted<JSObject*> proto(cx);
if (protoClass) {
proto =
CreateInterfacePrototypeObject(cx, global, protoProto, protoClass,
properties, chromeOnlyProperties);
if (!proto) {
return;
}
js::SetReservedSlot(proto, DOM_PROTO_INSTANCE_CLASS_SLOT,
JS::PrivateValue(const_cast<DOMClass*>(domClass)));
*protoCache = proto;
}
else {
MOZ_ASSERT(!proto);
}
JSObject* interface;
if (constructorClass || constructor) {
interface = CreateInterfaceObject(cx, global, constructorProto,
constructorClass, constructor,
ctorNargs, namedConstructors, proto,
properties, chromeOnlyProperties, name);
if (!interface) {
if (protoCache) {
// If we fail we need to make sure to clear the value of protoCache we
// set above.
*protoCache = nullptr;
}
return;
}
*constructorCache = interface;
}
}
bool
NativeInterface2JSObjectAndThrowIfFailed(JSContext* aCx,
JS::Handle<JSObject*> aScope,
JS::Value* aRetval,
xpcObjectHelper& aHelper,
const nsIID* aIID,
bool aAllowNativeWrapper)
{
nsresult rv;
XPCLazyCallContext lccx(JS_CALLER, aCx, aScope);
if (!XPCConvert::NativeInterface2JSObject(lccx, aRetval, NULL, aHelper, aIID,
NULL, aAllowNativeWrapper, &rv)) {
// I can't tell if NativeInterface2JSObject throws JS exceptions
// or not. This is a sloppy stab at the right semantics; the
// method really ought to be fixed to behave consistently.
if (!JS_IsExceptionPending(aCx)) {
Throw<true>(aCx, NS_FAILED(rv) ? rv : NS_ERROR_UNEXPECTED);
}
return false;
}
return true;
}
bool
TryPreserveWrapper(JSObject* obj)
{
nsISupports* native;
if (UnwrapDOMObjectToISupports(obj, native)) {
nsWrapperCache* cache = nullptr;
CallQueryInterface(native, &cache);
if (cache) {
nsContentUtils::PreserveWrapper(native, cache);
}
return true;
}
// If this DOMClass is not cycle collected, then it isn't wrappercached,
// so it does not need to be preserved. If it is cycle collected, then
// we can't tell if it is wrappercached or not, so we just return false.
const DOMClass* domClass = GetDOMClass(obj);
return domClass && !domClass->mParticipant;
}
// 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.
JSBool
InstanceClassHasProtoAtDepth(JSHandleObject protoObject, uint32_t protoID,
uint32_t depth)
{
const DOMClass* domClass = static_cast<DOMClass*>(
js::GetReservedSlot(protoObject, DOM_PROTO_INSTANCE_CLASS_SLOT).toPrivate());
return (uint32_t)domClass->mInterfaceChain[depth] == protoID;
}
// 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)
{
if (!NativeInterface2JSObjectAndThrowIfFailed(cx, scope, rval, helper, iid,
allowNativeWrapper)) {
return false;
}
#ifdef DEBUG
JSObject* jsobj = JSVAL_TO_OBJECT(*rval);
if (jsobj && !js::GetObjectParent(jsobj))
NS_ASSERTION(js::GetObjectClass(jsobj)->flags & JSCLASS_IS_GLOBAL,
"Why did we recreate this wrapper?");
#endif
return true;
}
bool
VariantToJsval(JSContext* aCx, JS::Handle<JSObject*> aScope,
nsIVariant* aVariant, JS::Value* aRetval)
{
nsresult rv;
XPCLazyCallContext lccx(JS_CALLER, aCx, aScope);
if (!XPCVariant::VariantDataToJS(lccx, aVariant, &rv, aRetval)) {
// Does it throw? Who knows
if (!JS_IsExceptionPending(aCx)) {
Throw<true>(aCx, NS_FAILED(rv) ? rv : NS_ERROR_UNEXPECTED);
}
return false;
}
return true;
}
JSBool
QueryInterface(JSContext* cx, unsigned argc, JS::Value* vp)
{
JS::Rooted<JS::Value> thisv(cx, JS_THIS(cx, vp));
if (thisv.isNull())
return false;
// Get the object. It might be a security wrapper, in which case we do a checked
// unwrap.
JS::Rooted<JSObject*> origObj(cx, &thisv.toObject());
JSObject* obj = js::CheckedUnwrap(origObj);
if (!obj) {
JS_ReportError(cx, "Permission denied to access object");
return false;
}
nsISupports* native;
if (!UnwrapDOMObjectToISupports(obj, native)) {
return Throw<true>(cx, NS_ERROR_FAILURE);
}
if (argc < 1) {
return Throw<true>(cx, NS_ERROR_XPC_NOT_ENOUGH_ARGS);
}
JS::Value* argv = JS_ARGV(cx, vp);
if (!argv[0].isObject()) {
return Throw<true>(cx, NS_ERROR_XPC_BAD_CONVERT_JS);
}
nsIJSID* iid;
xpc_qsSelfRef iidRef;
if (NS_FAILED(xpc_qsUnwrapArg<nsIJSID>(cx, argv[0], &iid, &iidRef.ptr,
&argv[0]))) {
return Throw<true>(cx, NS_ERROR_XPC_BAD_CONVERT_JS);
}
MOZ_ASSERT(iid);
if (iid->GetID()->Equals(NS_GET_IID(nsIClassInfo))) {
nsresult rv;
nsCOMPtr<nsIClassInfo> ci = do_QueryInterface(native, &rv);
if (NS_FAILED(rv)) {
return Throw<true>(cx, rv);
}
return WrapObject(cx, origObj, ci, &NS_GET_IID(nsIClassInfo), vp);
}
nsCOMPtr<nsISupports> unused;
nsresult rv = native->QueryInterface(*iid->GetID(), getter_AddRefs(unused));
if (NS_FAILED(rv)) {
return Throw<true>(cx, rv);
}
*vp = thisv;
return true;
}
JSBool
ThrowingConstructor(JSContext* cx, unsigned argc, JS::Value* vp)
{
return ThrowErrorMessage(cx, MSG_ILLEGAL_CONSTRUCTOR);
}
inline const NativePropertyHooks*
GetNativePropertyHooks(JSContext *cx, JS::Handle<JSObject*> obj,
DOMObjectType& type)
{
const DOMClass* domClass = GetDOMClass(obj);
if (domClass) {
type = eInstance;
return domClass->mNativeHooks;
}
if (JS_ObjectIsFunction(cx, obj)) {
MOZ_ASSERT(JS_IsNativeFunction(obj, Constructor));
type = eInterface;
const JS::Value& v =
js::GetFunctionNativeReserved(obj,
CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT);
const JSNativeHolder* nativeHolder =
static_cast<const JSNativeHolder*>(v.toPrivate());
return nativeHolder->mPropertyHooks;
}
MOZ_ASSERT(IsDOMIfaceAndProtoClass(js::GetObjectClass(obj)));
const DOMIfaceAndProtoJSClass* ifaceAndProtoJSClass =
DOMIfaceAndProtoJSClass::FromJSClass(js::GetObjectClass(obj));
type = ifaceAndProtoJSClass->mType;
return ifaceAndProtoJSClass->mNativeHooks;
}
bool
XrayResolveOwnProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JSPropertyDescriptor* desc, unsigned flags)
{
DOMObjectType type;
const NativePropertyHooks *nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
return type != eInstance || !nativePropertyHooks->mResolveOwnProperty ||
nativePropertyHooks->mResolveOwnProperty(cx, wrapper, obj, id, desc,
flags);
}
static bool
XrayResolveAttribute(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
const Prefable<const JSPropertySpec>* attributes, jsid* attributeIds,
const JSPropertySpec* attributeSpecs, JSPropertyDescriptor* desc)
{
for (; attributes->specs; ++attributes) {
if (attributes->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = attributes->specs - attributeSpecs;
for ( ; attributeIds[i] != JSID_VOID; ++i) {
if (id == attributeIds[i]) {
const JSPropertySpec& attrSpec = attributeSpecs[i];
// Because of centralization, we need to make sure we fault in the
// JitInfos as well. At present, until the JSAPI changes, the easiest
// way to do this is wrap them up as functions ourselves.
desc->attrs = attrSpec.flags & ~JSPROP_NATIVE_ACCESSORS;
// They all have getters, so we can just make it.
JS::Rooted<JSObject*> global(cx, JS_GetGlobalForObject(cx, wrapper));
JS::Rooted<JSFunction*> fun(cx,
JS_NewFunction(cx, (JSNative)attrSpec.getter.op,
0, 0, global, nullptr));
if (!fun)
return false;
SET_JITINFO(fun, attrSpec.getter.info);
JSObject *funobj = JS_GetFunctionObject(fun);
desc->getter = js::CastAsJSPropertyOp(funobj);
desc->attrs |= JSPROP_GETTER;
if (attrSpec.setter.op) {
// We have a setter! Make it.
fun = JS_NewFunction(cx, (JSNative)attrSpec.setter.op, 1, 0,
global, nullptr);
if (!fun)
return false;
SET_JITINFO(fun, attrSpec.setter.info);
funobj = JS_GetFunctionObject(fun);
desc->setter = js::CastAsJSStrictPropertyOp(funobj);
desc->attrs |= JSPROP_SETTER;
} else {
desc->setter = nullptr;
}
desc->obj = wrapper;
return true;
}
}
}
}
return true;
}
static bool
XrayResolveProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JSPropertyDescriptor* desc, DOMObjectType type,
const NativeProperties* nativeProperties)
{
const Prefable<const JSFunctionSpec>* methods;
jsid* methodIds;
const JSFunctionSpec* methodsSpecs;
if (type == eInterface) {
methods = nativeProperties->staticMethods;
methodIds = nativeProperties->staticMethodIds;
methodsSpecs = nativeProperties->staticMethodsSpecs;
} else {
methods = nativeProperties->methods;
methodIds = nativeProperties->methodIds;
methodsSpecs = nativeProperties->methodsSpecs;
}
if (methods) {
const Prefable<const JSFunctionSpec>* method;
for (method = methods; method->specs; ++method) {
if (method->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = method->specs - methodsSpecs;
for ( ; methodIds[i] != JSID_VOID; ++i) {
if (id == methodIds[i]) {
const JSFunctionSpec& methodSpec = methodsSpecs[i];
JSFunction *fun = JS_NewFunctionById(cx, methodSpec.call.op,
methodSpec.nargs, 0,
wrapper, id);
if (!fun) {
return false;
}
SET_JITINFO(fun, methodSpec.call.info);
JSObject *funobj = JS_GetFunctionObject(fun);
desc->value.setObject(*funobj);
desc->attrs = methodSpec.flags;
desc->obj = wrapper;
desc->setter = nullptr;
desc->getter = nullptr;
return true;
}
}
}
}
}
if (type == eInterface) {
if (nativeProperties->staticAttributes) {
if (!XrayResolveAttribute(cx, wrapper, obj, id,
nativeProperties->staticAttributes,
nativeProperties->staticAttributeIds,
nativeProperties->staticAttributeSpecs, desc)) {
return false;
}
if (desc->obj) {
return true;
}
}
} else {
if (nativeProperties->attributes) {
if (!XrayResolveAttribute(cx, wrapper, obj, id,
nativeProperties->attributes,
nativeProperties->attributeIds,
nativeProperties->attributeSpecs, desc)) {
return false;
}
if (desc->obj) {
return true;
}
}
if (nativeProperties->unforgeableAttributes) {
if (!XrayResolveAttribute(cx, wrapper, obj, id,
nativeProperties->unforgeableAttributes,
nativeProperties->unforgeableAttributeIds,
nativeProperties->unforgeableAttributeSpecs,
desc)) {
return false;
}
if (desc->obj) {
return true;
}
}
}
if (nativeProperties->constants) {
const Prefable<const ConstantSpec>* constant;
for (constant = nativeProperties->constants; constant->specs; ++constant) {
if (constant->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = constant->specs - nativeProperties->constantSpecs;
for ( ; nativeProperties->constantIds[i] != JSID_VOID; ++i) {
if (id == nativeProperties->constantIds[i]) {
desc->attrs = JSPROP_ENUMERATE | JSPROP_READONLY | JSPROP_PERMANENT;
desc->obj = wrapper;
desc->value = nativeProperties->constantSpecs[i].value;
return true;
}
}
}
}
}
return true;
}
static bool
ResolvePrototypeOrConstructor(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
size_t protoAndIfaceArrayIndex, unsigned attrs,
JSPropertyDescriptor* desc)
{
JS::Rooted<JSObject*> global(cx, js::GetGlobalForObjectCrossCompartment(obj));
{
JSAutoCompartment ac(cx, global);
JSObject** protoAndIfaceArray = GetProtoAndIfaceArray(global);
JSObject* protoOrIface = protoAndIfaceArray[protoAndIfaceArrayIndex];
if (!protoOrIface) {
return false;
}
desc->obj = wrapper;
desc->shortid = 0;
desc->attrs = attrs;
desc->getter = JS_PropertyStub;
desc->setter = JS_StrictPropertyStub;
desc->value = JS::ObjectValue(*protoOrIface);
}
return JS_WrapPropertyDescriptor(cx, desc);
}
bool
XrayResolveNativeProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
const NativePropertyHooks* nativePropertyHooks,
DOMObjectType type, JS::Handle<JSObject*> obj,
JS::Handle<jsid> id,
JSPropertyDescriptor* desc)
{
if (type == eInterface && IdEquals(id, "prototype")) {
return nativePropertyHooks->mPrototypeID == prototypes::id::_ID_Count ||
ResolvePrototypeOrConstructor(cx, wrapper, obj,
nativePropertyHooks->mPrototypeID,
JSPROP_PERMANENT | JSPROP_READONLY,
desc);
}
if (type == eInterfacePrototype && IdEquals(id, "constructor")) {
return nativePropertyHooks->mConstructorID == constructors::id::_ID_Count ||
ResolvePrototypeOrConstructor(cx, wrapper, obj,
nativePropertyHooks->mConstructorID,
0, desc);
}
const NativePropertiesHolder& nativeProperties =
nativePropertyHooks->mNativeProperties;
if (nativeProperties.regular &&
!XrayResolveProperty(cx, wrapper, obj, id, desc, type,
nativeProperties.regular)) {
return false;
}
if (!desc->obj &&
nativeProperties.chromeOnly &&
xpc::AccessCheck::isChrome(js::GetObjectCompartment(wrapper)) &&
!XrayResolveProperty(cx, wrapper, obj, id, desc, type,
nativeProperties.chromeOnly)) {
return false;
}
return true;
}
bool
XrayResolveNativeProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
JS::Handle<jsid> id, JSPropertyDescriptor* desc)
{
DOMObjectType type;
const NativePropertyHooks* nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
if (type == eInstance) {
// Force the type to be eInterfacePrototype, since we need to walk the
// prototype chain.
type = eInterfacePrototype;
}
if (type == eInterfacePrototype) {
do {
if (!XrayResolveNativeProperty(cx, wrapper, nativePropertyHooks, type,
obj, id, desc)) {
return false;
}
if (desc->obj) {
return true;
}
} while ((nativePropertyHooks = nativePropertyHooks->mProtoHooks));
return true;
}
return XrayResolveNativeProperty(cx, wrapper, nativePropertyHooks, type, obj,
id, desc);
}
bool
XrayEnumerateAttributes(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
const Prefable<const JSPropertySpec>* attributes,
jsid* attributeIds, const JSPropertySpec* attributeSpecs,
unsigned flags, JS::AutoIdVector& props)
{
for (; attributes->specs; ++attributes) {
if (attributes->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = attributes->specs - attributeSpecs;
for ( ; attributeIds[i] != JSID_VOID; ++i) {
if (((flags & JSITER_HIDDEN) ||
(attributeSpecs[i].flags & JSPROP_ENUMERATE)) &&
!props.append(attributeIds[i])) {
return false;
}
}
}
}
return true;
}
bool
XrayEnumerateProperties(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
unsigned flags, JS::AutoIdVector& props,
DOMObjectType type,
const NativeProperties* nativeProperties)
{
const Prefable<const JSFunctionSpec>* methods;
jsid* methodIds;
const JSFunctionSpec* methodsSpecs;
if (type == eInterface) {
methods = nativeProperties->staticMethods;
methodIds = nativeProperties->staticMethodIds;
methodsSpecs = nativeProperties->staticMethodsSpecs;
} else {
methods = nativeProperties->methods;
methodIds = nativeProperties->methodIds;
methodsSpecs = nativeProperties->methodsSpecs;
}
if (methods) {
const Prefable<const JSFunctionSpec>* method;
for (method = methods; method->specs; ++method) {
if (method->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = method->specs - methodsSpecs;
for ( ; methodIds[i] != JSID_VOID; ++i) {
if (((flags & JSITER_HIDDEN) ||
(methodsSpecs[i].flags & JSPROP_ENUMERATE)) &&
!props.append(methodIds[i])) {
return false;
}
}
}
}
}
if (type == eInterface) {
if (nativeProperties->staticAttributes &&
!XrayEnumerateAttributes(cx, wrapper, obj,
nativeProperties->staticAttributes,
nativeProperties->staticAttributeIds,
nativeProperties->staticAttributeSpecs,
flags, props)) {
return false;
}
} else {
if (nativeProperties->attributes &&
!XrayEnumerateAttributes(cx, wrapper, obj,
nativeProperties->attributes,
nativeProperties->attributeIds,
nativeProperties->attributeSpecs,
flags, props)) {
return false;
}
if (nativeProperties->unforgeableAttributes &&
!XrayEnumerateAttributes(cx, wrapper, obj,
nativeProperties->unforgeableAttributes,
nativeProperties->unforgeableAttributeIds,
nativeProperties->unforgeableAttributeSpecs,
flags, props)) {
return false;
}
}
if (nativeProperties->constants) {
const Prefable<const ConstantSpec>* constant;
for (constant = nativeProperties->constants; constant->specs; ++constant) {
if (constant->isEnabled(cx, obj)) {
// Set i to be the index into our full list of ids/specs that we're
// looking at now.
size_t i = constant->specs - nativeProperties->constantSpecs;
for ( ; nativeProperties->constantIds[i] != JSID_VOID; ++i) {
if (!props.append(nativeProperties->constantIds[i])) {
return false;
}
}
}
}
}
return true;
}
bool
XrayEnumerateNativeProperties(JSContext* cx, JS::Handle<JSObject*> wrapper,
const NativePropertyHooks* nativePropertyHooks,
DOMObjectType type, JS::Handle<JSObject*> obj,
unsigned flags, JS::AutoIdVector& props)
{
if (type == eInterface &&
nativePropertyHooks->mPrototypeID != prototypes::id::_ID_Count &&
!AddStringToIDVector(cx, props, "prototype")) {
return false;
}
if (type == eInterfacePrototype &&
nativePropertyHooks->mConstructorID != constructors::id::_ID_Count &&
(flags & JSITER_HIDDEN) &&
!AddStringToIDVector(cx, props, "constructor")) {
return false;
}
const NativePropertiesHolder& nativeProperties =
nativePropertyHooks->mNativeProperties;
if (nativeProperties.regular &&
!XrayEnumerateProperties(cx, wrapper, obj, flags, props, type,
nativeProperties.regular)) {
return false;
}
if (nativeProperties.chromeOnly &&
xpc::AccessCheck::isChrome(js::GetObjectCompartment(wrapper)) &&
!XrayEnumerateProperties(cx, wrapper, obj, flags, props, type,
nativeProperties.chromeOnly)) {
return false;
}
return true;
}
bool
XrayEnumerateProperties(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
unsigned flags, JS::AutoIdVector& props)
{
DOMObjectType type;
const NativePropertyHooks* nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
if (type == eInstance) {
if (nativePropertyHooks->mEnumerateOwnProperties &&
!nativePropertyHooks->mEnumerateOwnProperties(cx, wrapper, obj,
props)) {
return false;
}
if (flags & JSITER_OWNONLY) {
return true;
}
// Force the type to be eInterfacePrototype, since we need to walk the
// prototype chain.
type = eInterfacePrototype;
}
if (type == eInterfacePrototype) {
do {
if (!XrayEnumerateNativeProperties(cx, wrapper, nativePropertyHooks, type,
obj, flags, props)) {
return false;
}
if (flags & JSITER_OWNONLY) {
return true;
}
} while ((nativePropertyHooks = nativePropertyHooks->mProtoHooks));
return true;
}
return XrayEnumerateNativeProperties(cx, wrapper, nativePropertyHooks, type,
obj, flags, props);
}
NativePropertyHooks sWorkerNativePropertyHooks = {
nullptr,
nullptr,
{
nullptr,
nullptr
},
prototypes::id::_ID_Count,
constructors::id::_ID_Count,
nullptr
};
bool
GetPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
JS::Handle<jsid> id, bool* found,
JS::Value* vp)
{
JS::Rooted<JSObject*> proto(cx);
if (!js::GetObjectProto(cx, proxy, &proto)) {
return false;
}
if (!proto) {
*found = false;
return true;
}
JSBool hasProp;
if (!JS_HasPropertyById(cx, proto, id, &hasProp)) {
return false;
}
*found = hasProp;
if (!hasProp || !vp) {
return true;
}
return JS_ForwardGetPropertyTo(cx, proto, id, proxy, vp);
}
bool
HasPropertyOnPrototype(JSContext* cx, JS::Handle<JSObject*> proxy,
DOMProxyHandler* handler,
JS::Handle<jsid> id)
{
JS::Rooted<JSObject*> obj(cx, proxy);
Maybe<JSAutoCompartment> ac;
if (xpc::WrapperFactory::IsXrayWrapper(obj)) {
obj = js::UncheckedUnwrap(obj);
ac.construct(cx, obj);
}
MOZ_ASSERT(js::IsProxy(obj) && js::GetProxyHandler(obj) == handler);
bool found;
// We ignore an error from GetPropertyOnPrototype.
return !GetPropertyOnPrototype(cx, obj, id, &found, NULL) || found;
}
JSObject*
GetXrayExpandoChain(JSObject* obj)
{
js::Class* clasp = js::GetObjectClass(obj);
JS::Value v;
if (IsDOMClass(clasp) || IsDOMIfaceAndProtoClass(clasp)) {
v = js::GetReservedSlot(obj, DOM_XRAY_EXPANDO_SLOT);
} else if (js::IsObjectProxyClass(clasp) || js::IsFunctionProxyClass(clasp)) {
MOZ_ASSERT(js::GetProxyHandler(obj)->family() == ProxyFamily());
v = js::GetProxyExtra(obj, JSPROXYSLOT_XRAY_EXPANDO);
} else {
MOZ_ASSERT(JS_IsNativeFunction(obj, Constructor));
v = js::GetFunctionNativeReserved(obj, CONSTRUCTOR_XRAY_EXPANDO_SLOT);
}
return v.isUndefined() ? nullptr : &v.toObject();
}
void
SetXrayExpandoChain(JSObject* obj, JSObject* chain)
{
JS::Value v = chain ? JS::ObjectValue(*chain) : JSVAL_VOID;
js::Class* clasp = js::GetObjectClass(obj);
if (IsDOMClass(clasp) || IsDOMIfaceAndProtoClass(clasp)) {
js::SetReservedSlot(obj, DOM_XRAY_EXPANDO_SLOT, v);
} else if (js::IsObjectProxyClass(clasp) || js::IsFunctionProxyClass(clasp)) {
MOZ_ASSERT(js::GetProxyHandler(obj)->family() == ProxyFamily());
js::SetProxyExtra(obj, JSPROXYSLOT_XRAY_EXPANDO, v);
} else {
MOZ_ASSERT(JS_IsNativeFunction(obj, Constructor));
js::SetFunctionNativeReserved(obj, CONSTRUCTOR_XRAY_EXPANDO_SLOT, v);
}
}
bool
MainThreadDictionaryBase::ParseJSON(JSContext *aCx,
const nsAString& aJSON,
JS::MutableHandle<JS::Value> aVal)
{
if (aJSON.IsEmpty()) {
return true;
}
return JS_ParseJSON(aCx,
static_cast<const jschar*>(PromiseFlatString(aJSON).get()),
aJSON.Length(), aVal.address());
}
static JSString*
ConcatJSString(JSContext* cx, const char* pre, JSString* str, const char* post)
{
if (!str) {
return nullptr;
}
JS::Rooted<JSString*> preString(cx, JS_NewStringCopyN(cx, pre, strlen(pre)));
JS::Rooted<JSString*> postString(cx, JS_NewStringCopyN(cx, post, strlen(post)));
if (!preString || !postString) {
return nullptr;
}
str = JS_ConcatStrings(cx, preString, str);
if (!str) {
return nullptr;
}
return JS_ConcatStrings(cx, str, postString);
}
bool
NativeToString(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, const char* pre,
const char* post, JS::Value* v)
{
JS::Rooted<JSPropertyDescriptor> toStringDesc(cx);
toStringDesc.object().set(nullptr);
toStringDesc.setAttributes(0);
toStringDesc.setShortId(0);
toStringDesc.setGetter(nullptr);
toStringDesc.setSetter(nullptr);
toStringDesc.value().set(JS::UndefinedValue());
JS::Rooted<jsid> id(cx,
nsXPConnect::GetRuntimeInstance()->GetStringID(XPCJSRuntime::IDX_TO_STRING));
if (!XrayResolveNativeProperty(cx, wrapper, obj, id,
toStringDesc.address())) {
return false;
}
JS::Rooted<JSString*> str(cx);
{
JSAutoCompartment ac(cx, obj);
if (toStringDesc.object()) {
JS::Rooted<JS::Value> toString(cx, toStringDesc.value());
if (!JS_WrapValue(cx, toString.address())) {
return false;
}
MOZ_ASSERT(JS_ObjectIsCallable(cx, &toString.toObject()));
JS::Rooted<JS::Value> toStringResult(cx);
if (JS_CallFunctionValue(cx, obj, toString, 0, nullptr,
toStringResult.address())) {
str = toStringResult.toString();
} else {
str = nullptr;
}
} else {
if (IsDOMProxy(obj)) {
str = JS_BasicObjectToString(cx, obj);
} else {
js::Class* clasp = js::GetObjectClass(obj);
if (IsDOMClass(clasp)) {
str = ConcatJSString(cx, "[object ",
JS_NewStringCopyZ(cx, clasp->name), "]");
} else if (IsDOMIfaceAndProtoClass(clasp)) {
const DOMIfaceAndProtoJSClass* ifaceAndProtoJSClass =
DOMIfaceAndProtoJSClass::FromJSClass(clasp);
str = JS_NewStringCopyZ(cx, ifaceAndProtoJSClass->mToString);
} else {
MOZ_ASSERT(JS_IsNativeFunction(obj, Constructor));
str = JS_DecompileFunction(cx, JS_GetObjectFunction(obj), 0);
}
}
str = ConcatJSString(cx, pre, str, post);
}
}
if (!str) {
return false;
}
v->setString(str);
return JS_WrapValue(cx, v);
}
// Dynamically ensure that two objects don't end up with the same reserved slot.
class MOZ_STACK_CLASS AutoCloneDOMObjectSlotGuard
{
public:
AutoCloneDOMObjectSlotGuard(JSContext* aCx, JSObject* aOld, JSObject* aNew)
: mOldReflector(aCx, aOld), mNewReflector(aCx, aNew)
{
MOZ_ASSERT(js::GetReservedSlot(aOld, DOM_OBJECT_SLOT) ==
js::GetReservedSlot(aNew, DOM_OBJECT_SLOT));
}
~AutoCloneDOMObjectSlotGuard()
{
if (js::GetReservedSlot(mOldReflector, DOM_OBJECT_SLOT).toPrivate()) {
js::SetReservedSlot(mNewReflector, DOM_OBJECT_SLOT,
JS::PrivateValue(nullptr));
}
}
private:
JS::Rooted<JSObject*> mOldReflector;
JS::Rooted<JSObject*> mNewReflector;
};
nsresult
ReparentWrapper(JSContext* aCx, JS::HandleObject aObjArg)
{
// aObj is assigned to below, so needs to be re-rooted.
JS::RootedObject aObj(aCx, aObjArg);
const DOMClass* domClass = GetDOMClass(aObj);
JS::Rooted<JSObject*> oldParent(aCx, JS_GetParent(aObj));
JS::Rooted<JSObject*> newParent(aCx, domClass->mGetParent(aCx, aObj));
JSAutoCompartment oldAc(aCx, oldParent);
if (js::GetObjectCompartment(oldParent) ==
js::GetObjectCompartment(newParent)) {
if (!JS_SetParent(aCx, aObj, newParent)) {
MOZ_CRASH();
}
return NS_OK;
}
nsISupports* native;
if (!UnwrapDOMObjectToISupports(aObj, native)) {
return NS_OK;
}
// Before proceeding, eagerly create any same-compartment security wrappers
// that the object might have. This forces us to take the 'WithWrapper' path
// while transplanting that handles this stuff correctly.
JS::Rooted<JSObject*> ww(aCx,
xpc::WrapperFactory::WrapForSameCompartment(aCx, aObj));
if (!ww) {
return NS_ERROR_FAILURE;
}
bool isProxy = js::IsProxy(aObj);
JS::Rooted<JSObject*> expandoObject(aCx);
if (isProxy) {
expandoObject = DOMProxyHandler::GetAndClearExpandoObject(aObj);
}
JSAutoCompartment newAc(aCx, newParent);
// First we clone the reflector. We get a copy of its properties and clone its
// expando chain. The only part that is dangerous here is that if we have to
// return early we must avoid ending up with two reflectors pointing to the
// same native. Other than that, the objects we create will just go away.
JS::Rooted<JSObject*> global(aCx,
js::GetGlobalForObjectCrossCompartment(newParent));
JS::Handle<JSObject*> proto = (domClass->mGetProto)(aCx, global);
if (!proto) {
return NS_ERROR_FAILURE;
}
JS::Rooted<JSObject*> newobj(aCx, JS_CloneObject(aCx, aObj, proto, newParent));
if (!newobj) {
return NS_ERROR_FAILURE;
}
js::SetReservedSlot(newobj, DOM_OBJECT_SLOT,
js::GetReservedSlot(aObj, DOM_OBJECT_SLOT));
// At this point, both |aObj| and |newobj| point to the same native
// which is bad, because one of them will end up being finalized with a
// native it does not own. |cloneGuard| ensures that if we exit before
// clearing |aObj|'s reserved slot the reserved slot of |newobj| will be
// set to null. |aObj| will go away soon, because we swap it with
// another object during the transplant and let that object die.
JS::Rooted<JSObject*> propertyHolder(aCx);
{
AutoCloneDOMObjectSlotGuard cloneGuard(aCx, aObj, newobj);
JS::Rooted<JSObject*> copyFrom(aCx, isProxy ? expandoObject : aObj);
if (copyFrom) {
propertyHolder = JS_NewObjectWithGivenProto(aCx, nullptr, nullptr,
newParent);
if (!propertyHolder) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!JS_CopyPropertiesFrom(aCx, propertyHolder, copyFrom)) {
return NS_ERROR_FAILURE;
}
} else {
propertyHolder = nullptr;
}
// Expandos from other compartments are attached to the target JS object.
// Copy them over, and let the old ones die a natural death.
SetXrayExpandoChain(newobj, nullptr);
if (!xpc::XrayUtils::CloneExpandoChain(aCx, newobj, aObj)) {
return NS_ERROR_FAILURE;
}
// We've set up |newobj|, so we make it own the native by nulling
// out the reserved slot of |obj|.
//
// NB: It's important to do this _after_ copying the properties to
// propertyHolder. Otherwise, an object with |foo.x === foo| will
// crash when JS_CopyPropertiesFrom tries to call wrap() on foo.x.
js::SetReservedSlot(aObj, DOM_OBJECT_SLOT, JS::PrivateValue(nullptr));
}
nsWrapperCache* cache = nullptr;
CallQueryInterface(native, &cache);
if (ww != aObj) {
MOZ_ASSERT(cache->HasSystemOnlyWrapper());
JSObject *newwrapper =
xpc::WrapperFactory::WrapSOWObject(aCx, newobj);
if (!newwrapper) {
MOZ_CRASH();
}
// Ok, now we do the special object-plus-wrapper transplant.
ww = xpc::TransplantObjectWithWrapper(aCx, aObj, ww, newobj, newwrapper);
if (!ww) {
MOZ_CRASH();
}
aObj = newobj;
SetSystemOnlyWrapperSlot(aObj, JS::ObjectValue(*ww));
} else {
aObj = xpc::TransplantObject(aCx, aObj, newobj);
if (!aObj) {
MOZ_CRASH();
}
}
bool preserving = cache->PreservingWrapper();
cache->SetPreservingWrapper(false);
cache->SetWrapper(aObj);
cache->SetPreservingWrapper(preserving);
if (propertyHolder) {
JSObject* copyTo;
if (isProxy) {
copyTo = DOMProxyHandler::EnsureExpandoObject(aCx, aObj);
} else {
copyTo = aObj;
}
if (!copyTo || !JS_CopyPropertiesFrom(aCx, copyTo, propertyHolder)) {
MOZ_CRASH();
}
}
nsObjectLoadingContent* htmlobject;
nsresult rv = UnwrapObject<HTMLObjectElement>(aCx, aObj, htmlobject);
if (NS_FAILED(rv)) {
rv = UnwrapObject<prototypes::id::HTMLEmbedElement,
HTMLSharedObjectElement>(aCx, aObj, htmlobject);
if (NS_FAILED(rv)) {
rv = UnwrapObject<prototypes::id::HTMLAppletElement,
HTMLSharedObjectElement>(aCx, aObj, htmlobject);
if (NS_FAILED(rv)) {
htmlobject = nullptr;
}
}
}
if (htmlobject) {
htmlobject->SetupProtoChain(aCx, aObj);
}
// Now we can just fix up the parent and return the wrapper
if (newParent && !JS_SetParent(aCx, aObj, newParent)) {
MOZ_CRASH();
}
return NS_OK;
}
template<bool mainThread>
inline JSObject*
GetGlobalObject(JSContext* aCx, JSObject* aObject,
Maybe<JSAutoCompartment>& aAutoCompartment)
{
JS::Rooted<JSObject*> obj(aCx, aObject);
if (js::IsWrapper(obj)) {
obj = js::CheckedUnwrap(obj, /* stopAtOuter = */ false);
if (!obj) {
Throw<mainThread>(aCx, NS_ERROR_XPC_SECURITY_MANAGER_VETO);
return nullptr;
}
aAutoCompartment.construct(aCx, obj);
}
return JS_GetGlobalForObject(aCx, obj);
}
GlobalObject::GlobalObject(JSContext* aCx, JSObject* aObject)
: mGlobalJSObject(aCx)
{
Maybe<JSAutoCompartment> ac;
mGlobalJSObject = GetGlobalObject<true>(aCx, aObject, ac);
if (!mGlobalJSObject) {
mGlobalObject = nullptr;
return;
}
JS::Value val;
val.setObject(*mGlobalJSObject);
// Switch this to UnwrapDOMObjectToISupports once our global objects are
// using new bindings.
nsresult rv = xpc_qsUnwrapArg<nsISupports>(aCx, val, &mGlobalObject,
static_cast<nsISupports**>(getter_AddRefs(mGlobalObjectRef)),
&val);
if (NS_FAILED(rv)) {
mGlobalObject = nullptr;
Throw<true>(aCx, NS_ERROR_XPC_BAD_CONVERT_JS);
}
}
WorkerGlobalObject::WorkerGlobalObject(JSContext* aCx, JSObject* aObject)
: mGlobalJSObject(aCx),
mCx(aCx)
{
Maybe<JSAutoCompartment> ac;
mGlobalJSObject = GetGlobalObject<false>(aCx, aObject, ac);
}
JSBool
InterfaceHasInstance(JSContext* cx, JS::Handle<JSObject*> obj,
JS::Handle<JSObject*> instance,
JSBool* bp)
{
const DOMIfaceAndProtoJSClass* clasp =
DOMIfaceAndProtoJSClass::FromJSClass(js::GetObjectClass(obj));
const DOMClass* domClass = GetDOMClass(js::UncheckedUnwrap(instance));
MOZ_ASSERT(!domClass || clasp->mPrototypeID != prototypes::id::_ID_Count,
"Why do we have a hasInstance hook if we don't have a prototype "
"ID?");
if (domClass &&
domClass->mInterfaceChain[clasp->mDepth] == clasp->mPrototypeID) {
*bp = true;
return true;
}
JS::Rooted<JS::Value> protov(cx);
DebugOnly<bool> ok = JS_GetProperty(cx, obj, "prototype", protov.address());
MOZ_ASSERT(ok, "Someone messed with our prototype property?");
JS::Rooted<JSObject*> interfacePrototype(cx, &protov.toObject());
MOZ_ASSERT(IsDOMIfaceAndProtoClass(js::GetObjectClass(interfacePrototype)),
"Someone messed with our prototype property?");
JS::Rooted<JSObject*> proto(cx);
if (!JS_GetPrototype(cx, instance, proto.address())) {
return false;
}
while (proto) {
if (proto == interfacePrototype) {
*bp = true;
return true;
}
if (!JS_GetPrototype(cx, proto, proto.address())) {
return false;
}
}
*bp = false;
return true;
}
JSBool
InterfaceHasInstance(JSContext* cx, JSHandleObject obj, JSMutableHandleValue vp,
JSBool* bp)
{
if (!vp.isObject()) {
*bp = false;
return true;
}
JS::Rooted<JSObject*> instanceObject(cx, &vp.toObject());
return InterfaceHasInstance(cx, obj, instanceObject, bp);
}
bool
ReportLenientThisUnwrappingFailure(JSContext* cx, JS::Handle<JSObject*> obj)
{
GlobalObject global(cx, obj);
if (global.Failed()) {
return false;
}
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(global.Get());
if (window && window->GetDoc()) {
window->GetDoc()->WarnOnceAbout(nsIDocument::eLenientThis);
}
return true;
}
// Date implementation methods
Date::Date() :
mMsecSinceEpoch(UnspecifiedNaN())
{
}
bool
Date::IsUndefined() const
{
return IsNaN(mMsecSinceEpoch);
}
bool
Date::SetTimeStamp(JSContext* cx, JSObject* objArg)
{
JS::Rooted<JSObject*> obj(cx, objArg);
MOZ_ASSERT(JS_ObjectIsDate(cx, obj));
obj = js::CheckedUnwrap(obj);
// This really sucks: even if JS_ObjectIsDate, CheckedUnwrap can _still_ fail
if (!obj) {
return false;
}
mMsecSinceEpoch = js_DateGetMsecSinceEpoch(obj);
return true;
}
bool
Date::ToDateObject(JSContext* cx, JS::Value* vp) const
{
JSObject* obj = JS_NewDateObjectMsec(cx, mMsecSinceEpoch);
if (!obj) {
return false;
}
*vp = JS::ObjectValue(*obj);
return true;
}
bool
GetWindowForJSImplementedObject(JSContext* cx, JS::Handle<JSObject*> obj,
nsPIDOMWindow** window)
{
// Be very careful to not get tricked here.
MOZ_ASSERT(NS_IsMainThread());
if (!xpc::AccessCheck::isChrome(js::GetObjectCompartment(obj))) {
NS_RUNTIMEABORT("Should have a chrome object here");
}
// Look up the content-side object.
JS::Rooted<JS::Value> domImplVal(cx);
if (!JS_GetProperty(cx, obj, "__DOM_IMPL__", domImplVal.address())) {
return false;
}
if (!domImplVal.isObject()) {
ThrowErrorMessage(cx, MSG_NOT_OBJECT);
return false;
}
// Go ahead and get the global from it. GlobalObject will handle
// doing unwrapping as needed.
GlobalObject global(cx, &domImplVal.toObject());
if (global.Failed()) {
return false;
}
// It's OK if we have null here: that just means the content-side
// object really wasn't associated with any window.
nsCOMPtr<nsPIDOMWindow> win(do_QueryInterface(global.Get()));
win.forget(window);
return true;
}
} // namespace dom
} // namespace mozilla
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