gecko/dom/bindings/BindingUtils.cpp

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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 "prprf.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/Assertions.h"
Bug 742217. Reduce the use of nested namespaces in our binding code. r=peterv,bent In the new setup, all per-interface DOM binding files are exported into mozilla/dom. General files not specific to an interface are also exported into mozilla/dom. In terms of namespaces, most things now live in mozilla::dom. Each interface Foo that has generated code has a mozilla::dom::FooBinding namespace for said generated code (and possibly a mozilla::bindings::FooBinding_workers if there's separate codegen for workers). IDL enums are a bit weird: since the name of the enum and the names of its entries all end up in the same namespace, we still generate a C++ namespace with the name of the IDL enum type with "Values" appended to it, with a ::valuelist inside for the actual C++ enum. We then typedef EnumFooValues::valuelist to EnumFoo. That makes it a bit more difficult to refer to the values, but means that values from different enums don't collide with each other. The enums with the proto and constructor IDs in them now live under the mozilla::dom::prototypes and mozilla::dom::constructors namespaces respectively. Again, this lets us deal sanely with the whole "enum value names are flattened into the namespace the enum is in" deal. The main benefit of this setup (and the reason "Binding" got appended to the per-interface namespaces) is that this way "using mozilla::dom" should Just Work for consumers and still allow C++ code to sanely use the IDL interface names for concrete classes, which is fairly desirable. --HG-- rename : dom/bindings/Utils.cpp => dom/bindings/BindingUtils.cpp rename : dom/bindings/Utils.h => dom/bindings/BindingUtils.h
2012-05-02 21:35:38 -07:00
#include "BindingUtils.h"
#include "AccessCheck.h"
#include "jsfriendapi.h"
#include "nsContentUtils.h"
#include "nsIDOMGlobalPropertyInitializer.h"
#include "nsIXPConnect.h"
#include "WrapperFactory.h"
#include "xpcprivate.h"
#include "XPCQuickStubs.h"
#include "XrayWrapper.h"
#include "nsPrintfCString.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, nullptr,
static_cast<const unsigned>(aErrorNumber), ap);
va_end(ap);
return false;
}
bool
ThrowInvalidThis(JSContext* aCx, const JS::CallArgs& aArgs,
const ErrNum aErrorNumber,
const char* aInterfaceName)
{
NS_ConvertASCIItoUTF16 ifaceName(aInterfaceName);
// This should only be called for DOM methods/getters/setters, which
// are JSNative-backed functions, so we can assume that
// JS_ValueToFunction and JS_GetFunctionDisplayId will both return
// non-null and that JS_GetStringCharsZ returns non-null.
JS::Rooted<JSFunction*> func(aCx, JS_ValueToFunction(aCx, aArgs.calleev()));
MOZ_ASSERT(func);
JS::Rooted<JSString*> funcName(aCx, JS_GetFunctionDisplayId(func));
MOZ_ASSERT(funcName);
JS_ReportErrorNumberUC(aCx, GetErrorMessage, nullptr,
static_cast<const unsigned>(aErrorNumber),
JS_GetStringCharsZ(aCx, funcName),
ifaceName.get());
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);
}
void
ErrorResult::StealJSException(JSContext* cx,
JS::MutableHandle<JS::Value> value)
{
MOZ_ASSERT(!mMightHaveUnreportedJSException,
"Must call WouldReportJSException unconditionally in all codepaths that might call StealJSException");
MOZ_ASSERT(IsJSException(), "No exception to steal");
value.set(mJSException);
JS_RemoveValueRoot(cx, &mJSException);
mResult = NS_OK;
}
void
ErrorResult::ReportNotEnoughArgsError(JSContext* cx,
const char* ifaceName,
const char* memberName)
{
MOZ_ASSERT(ErrorCode() == NS_ERROR_XPC_NOT_ENOUGH_ARGS);
nsPrintfCString errorMessage("%s.%s", ifaceName, memberName);
ThrowErrorMessage(cx, dom::MSG_MISSING_ARGUMENTS, errorMessage.get());
}
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, JS::Heap<JSObject*>* protoCache,
JS::Handle<JSObject*> constructorProto,
JSClass* constructorClass, const JSNativeHolder* constructor,
unsigned ctorNargs, const NamedConstructor* namedConstructors,
JS::Heap<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;
if (!XPCConvert::NativeInterface2JSObject(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)
{
MOZ_ASSERT(IsDOMObject(obj));
if (nsISupports* native = UnwrapDOMObjectToISupports(obj)) {
nsWrapperCache* cache = nullptr;
CallQueryInterface(native, &cache);
if (cache) {
cache->PreserveWrapper(native);
}
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(JS::Handle<JSObject*> 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;
if (!XPCVariant::VariantDataToJS(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::CallArgs args = JS::CallArgsFromVp(argc, 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 = UnwrapDOMObjectToISupports(obj);
if (!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;
SelfRef 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), args.rval());
}
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_NewFunctionById(cx, (JSNative)attrSpec.getter.op,
0, 0, global, id));
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_NewFunctionById(cx, (JSNative)attrSpec.setter.op, 1, 0,
global, id);
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);
JS::Heap<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
XrayDefineProperty(JSContext* cx, JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JSPropertyDescriptor* desc, bool* defined)
{
if (!js::IsProxy(obj))
return true;
MOZ_ASSERT(IsDOMProxy(obj), "What kind of proxy is this?");
DOMProxyHandler* handler =
static_cast<DOMProxyHandler*>(js::GetProxyHandler(obj));
return handler->defineProperty(cx, wrapper, id, desc, defined);
}
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;
}
JS::Rooted<JS::Value> value(cx);
if (!JS_ForwardGetPropertyTo(cx, proto, id, proxy, &value)) {
return false;
}
*vp = value;
return true;
}
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::IsProxyClass(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::IsProxyClass(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);
}
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 = UnwrapDOMObjectToISupports(aObj);
if (!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());
JS::RootedObject newwrapper(aCx,
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::Rooted<JS::Value> val(aCx, JS::ObjectValue(*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.address());
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);
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, JS::Handle<JSObject*> obj, JS::MutableHandle<JS::Value> 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::MutableHandle<JS::Value> rval) const
{
JSObject* obj = JS_NewDateObjectMsec(cx, mMsecSinceEpoch);
if (!obj) {
return false;
}
rval.set(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)) {
return false;
}
if (!domImplVal.isObject()) {
ThrowErrorMessage(cx, MSG_NOT_OBJECT, "Value");
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;
}
already_AddRefed<nsPIDOMWindow>
ConstructJSImplementation(JSContext* aCx, const char* aContractId,
const GlobalObject& aGlobal,
JS::MutableHandle<JSObject*> aObject,
ErrorResult& aRv)
{
// Get the window to use as a parent and for initialization.
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.Get());
if (!window) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
// Make sure to have nothing on the JS context stack while creating and
// initializing the object, so exceptions from that will get reported
// properly, since those are never exceptions that a spec wants to be thrown.
{ // Scope for the nsCxPusher
nsCxPusher pusher;
pusher.PushNull();
// Get the XPCOM component containing the JS implementation.
nsCOMPtr<nsISupports> implISupports = do_CreateInstance(aContractId);
if (!implISupports) {
NS_WARNING("Failed to get JS implementation for contract");
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
// Initialize the object, if it implements nsIDOMGlobalPropertyInitializer.
nsCOMPtr<nsIDOMGlobalPropertyInitializer> gpi =
do_QueryInterface(implISupports);
if (gpi) {
JS::Rooted<JS::Value> initReturn(aCx);
nsresult rv = gpi->Init(window, initReturn.address());
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return nullptr;
}
MOZ_ASSERT(initReturn.isUndefined(),
"nsIDOMGlobalPropertyInitializer should return undefined");
}
// Extract the JS implementation from the XPCOM object.
nsCOMPtr<nsIXPConnectWrappedJS> implWrapped =
do_QueryInterface(implISupports);
MOZ_ASSERT(implWrapped, "Failed to get wrapped JS from XPCOM component.");
if (!implWrapped) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
aObject.set(implWrapped->GetJSObject());
if (!aObject) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
}
return window.forget();
}
bool
NonVoidByteStringToJsval(JSContext *cx, const nsACString &str,
JS::MutableHandle<JS::Value> rval)
{
if (str.IsEmpty()) {
rval.set(JS_GetEmptyStringValue(cx));
return true;
}
// ByteStrings are not UTF-8 encoded.
JSString* jsStr = JS_NewStringCopyN(cx, str.Data(), str.Length());
if (!jsStr)
return false;
rval.setString(jsStr);
return true;
}
bool
ConvertJSValueToByteString(JSContext* cx, JS::Handle<JS::Value> v,
JS::MutableHandle<JS::Value> pval, bool nullable,
nsACString& result)
{
JSString *s;
if (v.isString()) {
s = v.toString();
} else {
if (nullable && v.isNullOrUndefined()) {
result.SetIsVoid(true);
return true;
}
s = JS_ValueToString(cx, v);
if (!s) {
return false;
}
pval.set(JS::StringValue(s)); // Root the new string.
}
size_t length;
const jschar *chars = JS_GetStringCharsZAndLength(cx, s, &length);
if (!chars) {
return false;
}
// Conversion from Javascript string to ByteString is only valid if all
// characters < 256.
for (size_t i = 0; i < length; i++) {
if (chars[i] > 255) {
// The largest unsigned 64 bit number (18,446,744,073,709,551,615) has
// 20 digits, plus one more for the null terminator.
char index[21];
Bug 895322 - Part 1: Replace the usages of MOZ_STATIC_ASSERT with C++11 static_assert; r=Waldo This patch was mostly generated by running the following scripts on the codebase, with some manual changes made afterwards: # static_assert.sh #!/bin/bash # Command to convert an NSPR integer type to the equivalent standard integer type function convert() { echo "Converting $1 to $2..." find . ! -wholename "*nsprpub*" \ ! -wholename "*security/nss*" \ ! -wholename "*/.hg*" \ ! -wholename "obj-ff-dbg*" \ ! -name nsXPCOMCID.h \ ! -name prtypes.h \ -type f \ \( -iname "*.cpp" \ -o -iname "*.h" \ -o -iname "*.cc" \ -o -iname "*.mm" \) | \ xargs -n 1 `dirname $0`/assert_replacer.py #sed -i -e "s/\b$1\b/$2/g" } convert MOZ_STATIC_ASSERT static_assert hg rev --no-backup mfbt/Assertions.h \ media/webrtc/signaling/src/sipcc/core/includes/ccapi.h \ modules/libmar/src/mar_private.h \ modules/libmar/src/mar.h # assert_replacer.py #!/usr/bin/python import sys import re pattern = re.compile(r"\bMOZ_STATIC_ASSERT\b") def replaceInPlace(fname): print fname f = open(fname, "rw+") lines = f.readlines() for i in range(0, len(lines)): while True: index = re.search(pattern, lines[i]) if index != None: index = index.start() lines[i] = lines[i][0:index] + "static_assert" + lines[i][index+len("MOZ_STATIC_ASSERT"):] for j in range(i + 1, len(lines)): if lines[j].find(" ", index) == index: lines[j] = lines[j][0:index] + lines[j][index+4:] else: break else: break f.seek(0, 0) f.truncate() f.write("".join(lines)) f.close() argc = len(sys.argv) for i in range(1, argc): replaceInPlace(sys.argv[i]) --HG-- extra : rebase_source : 4b4a4047d82f2c205b9fad8d56dfc3f1afc0b045
2013-07-18 10:59:53 -07:00
static_assert(sizeof(size_t) <= 8, "index array too small");
PR_snprintf(index, sizeof(index), "%d", i);
// A jschar is 16 bits long. The biggest unsigned 16 bit
// number (65,535) has 5 digits, plus one more for the null
// terminator.
char badChar[6];
Bug 895322 - Part 1: Replace the usages of MOZ_STATIC_ASSERT with C++11 static_assert; r=Waldo This patch was mostly generated by running the following scripts on the codebase, with some manual changes made afterwards: # static_assert.sh #!/bin/bash # Command to convert an NSPR integer type to the equivalent standard integer type function convert() { echo "Converting $1 to $2..." find . ! -wholename "*nsprpub*" \ ! -wholename "*security/nss*" \ ! -wholename "*/.hg*" \ ! -wholename "obj-ff-dbg*" \ ! -name nsXPCOMCID.h \ ! -name prtypes.h \ -type f \ \( -iname "*.cpp" \ -o -iname "*.h" \ -o -iname "*.cc" \ -o -iname "*.mm" \) | \ xargs -n 1 `dirname $0`/assert_replacer.py #sed -i -e "s/\b$1\b/$2/g" } convert MOZ_STATIC_ASSERT static_assert hg rev --no-backup mfbt/Assertions.h \ media/webrtc/signaling/src/sipcc/core/includes/ccapi.h \ modules/libmar/src/mar_private.h \ modules/libmar/src/mar.h # assert_replacer.py #!/usr/bin/python import sys import re pattern = re.compile(r"\bMOZ_STATIC_ASSERT\b") def replaceInPlace(fname): print fname f = open(fname, "rw+") lines = f.readlines() for i in range(0, len(lines)): while True: index = re.search(pattern, lines[i]) if index != None: index = index.start() lines[i] = lines[i][0:index] + "static_assert" + lines[i][index+len("MOZ_STATIC_ASSERT"):] for j in range(i + 1, len(lines)): if lines[j].find(" ", index) == index: lines[j] = lines[j][0:index] + lines[j][index+4:] else: break else: break f.seek(0, 0) f.truncate() f.write("".join(lines)) f.close() argc = len(sys.argv) for i in range(1, argc): replaceInPlace(sys.argv[i]) --HG-- extra : rebase_source : 4b4a4047d82f2c205b9fad8d56dfc3f1afc0b045
2013-07-18 10:59:53 -07:00
static_assert(sizeof(jschar) <= 2, "badChar array too small");
PR_snprintf(badChar, sizeof(badChar), "%d", chars[i]);
ThrowErrorMessage(cx, MSG_INVALID_BYTESTRING, index, badChar);
return false;
}
}
if (length >= UINT32_MAX) {
return false;
}
result.SetCapacity(length+1);
JS_EncodeStringToBuffer(cx, s, result.BeginWriting(), length);
result.BeginWriting()[length] = '\0';
result.SetLength(length);
return true;
}
} // namespace dom
} // namespace mozilla