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>
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 "WrapperFactory.h"
#include "xpcprivate.h"
#include "nsContentUtils.h"
#include "XPCQuickStubs.h"
#include "nsIXPConnect.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 (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);
delete message;
mMessage = nullptr;
}
namespace dom {
bool
DefineConstants(JSContext* cx, JSObject* obj, 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, JSObject* obj, JSFunctionSpec* spec) {
return JS_DefineFunctions(cx, obj, spec);
}
static inline bool
Define(JSContext* cx, JSObject* obj, JSPropertySpec* spec) {
return JS_DefineProperties(cx, obj, spec);
}
static inline bool
Define(JSContext* cx, JSObject* obj, ConstantSpec* spec) {
return DefineConstants(cx, obj, spec);
}
template<typename T>
bool
DefinePrefable(JSContext* cx, JSObject* obj, Prefable<T>* props)
{
MOZ_ASSERT(props);
MOZ_ASSERT(props->specs);
do {
// Define if enabled
if (props->enabled) {
if (!Define(cx, obj, props->specs)) {
return false;
}
}
} while ((++props)->specs);
return true;
}
bool
DefineUnforgeableAttributes(JSContext* cx, JSObject* obj,
Prefable<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)
{
JSObject* callee = JSVAL_TO_OBJECT(JS_CALLEE(cx, vp));
JSObject* obj = JS_THIS_OBJECT(cx, vp);
if (!obj) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_CONVERT_TO,
"null", "object");
return false;
}
jsval 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);
JSNativeHolder* nativeHolder = static_cast<JSNativeHolder*>(v.toPrivate());
return (nativeHolder->mNative)(cx, argc, vp);
}
static JSObject*
CreateInterfaceObject(JSContext* cx, JSObject* global,
JSClass* constructorClass,
JSNativeHolder* constructorNative,
unsigned ctorNargs,
JSObject* proto,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties,
const char* name)
{
JSObject* constructor;
if (constructorClass) {
JSObject* functionProto = JS_GetFunctionPrototype(cx, global);
if (!functionProto) {
return NULL;
}
constructor = JS_NewObject(cx, constructorClass, functionProto, global);
} else {
MOZ_ASSERT(constructorNative);
JSFunction* fun = js::NewFunctionWithReserved(cx, Constructor, ctorNargs,
JSFUN_CONSTRUCTOR, global,
name);
if (!fun) {
return NULL;
}
constructor = JS_GetFunctionObject(fun);
js::SetFunctionNativeReserved(constructor,
CONSTRUCTOR_NATIVE_HOLDER_RESERVED_SLOT,
js::PrivateValue(constructorNative));
}
if (!constructor) {
return NULL;
}
if (constructorClass) {
JSFunction* toString = js::DefineFunctionWithReserved(cx, constructor,
"toString",
InterfaceObjectToString,
0, 0);
if (!toString) {
return NULL;
}
JSObject* toStringObj = JS_GetFunctionObject(toString);
js::SetFunctionNativeReserved(toStringObj, TOSTRING_CLASS_RESERVED_SLOT,
PRIVATE_TO_JSVAL(constructorClass));
JSString *str = ::JS_InternString(cx, name);
if (!str) {
return NULL;
}
js::SetFunctionNativeReserved(toStringObj, TOSTRING_NAME_RESERVED_SLOT,
STRING_TO_JSVAL(str));
}
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;
}
JSBool alreadyDefined;
if (!JS_AlreadyHasOwnProperty(cx, global, name, &alreadyDefined)) {
return NULL;
}
// This is Enumerable: False per spec.
if (!alreadyDefined &&
!JS_DefineProperty(cx, global, name, OBJECT_TO_JSVAL(constructor), NULL,
NULL, 0)) {
return NULL;
}
return constructor;
}
bool
DefineWebIDLBindingPropertiesOnXPCProto(JSContext* cx, 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, JSObject* global,
JSObject* parentProto, JSClass* protoClass,
const NativeProperties* properties,
const NativeProperties* chromeOnlyProperties)
{
JSObject* ourProto = 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, JSObject* global, JSObject* protoProto,
JSClass* protoClass, JSObject** protoCache,
JSClass* constructorClass, JSNativeHolder* constructor,
unsigned ctorNargs, 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");
JSObject* proto;
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 {
proto = NULL;
}
JSObject* interface;
if (constructorClass || constructor) {
interface = CreateInterfaceObject(cx, global, constructorClass, constructor,
ctorNargs, 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,
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;
}
// 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, 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;
}
JSBool
QueryInterface(JSContext* cx, unsigned argc, JS::Value* vp)
{
JS::Value thisv = JS_THIS(cx, vp);
if (thisv == JSVAL_NULL)
return false;
// Get the object. It might be a security wrapper, in which case we do a checked
// unwrap.
JSObject* origObj = JSVAL_TO_OBJECT(thisv);
JSObject* obj = js::UnwrapObjectChecked(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);
}
nsIJSIID* iid;
xpc_qsSelfRef iidRef;
if (NS_FAILED(xpc_qsUnwrapArg<nsIJSIID>(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);
}
// Lie, otherwise we need to check classinfo or QI
*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, JSObject *obj, DOMObjectType& type)
{
const DOMClass* domClass;
if (GetDOMClass(obj, domClass) != eNonDOMObject) {
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);
JSNativeHolder* nativeHolder = static_cast<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, JSObject* wrapper, JSObject* obj, jsid id,
bool set, JSPropertyDescriptor* desc)
{
DOMObjectType type;
const NativePropertyHooks *nativePropertyHooks =
GetNativePropertyHooks(cx, obj, type);
return type != eInstance || !nativePropertyHooks->mResolveOwnProperty ||
nativePropertyHooks->mResolveOwnProperty(cx, wrapper, obj, id, set,
desc);
}
static bool
XrayResolveAttribute(JSContext* cx, JSObject* wrapper, jsid id,
Prefable<JSPropertySpec>* attributes, jsid* attributeIds,
JSPropertySpec* attributeSpecs, JSPropertyDescriptor* desc)
{
for (; attributes->specs; ++attributes) {
if (attributes->enabled) {
// 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]) {
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.
JSObject *global = JS_GetGlobalForObject(cx, wrapper);
JSFunction *fun = 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, JSObject* wrapper, jsid id,
JSPropertyDescriptor* desc, DOMObjectType type,
const NativeProperties* nativeProperties)
{
Prefable<JSFunctionSpec>* methods;
jsid* methodIds;
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) {
Prefable<JSFunctionSpec>* method;
for (method = methods; method->specs; ++method) {
if (method->enabled) {
// 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]) {
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, id,
nativeProperties->staticAttributes,
nativeProperties->staticAttributeIds,
nativeProperties->staticAttributeSpecs, desc)) {
return false;
}
if (desc->obj) {
return true;
}
}
} else {
if (nativeProperties->attributes) {
if (!XrayResolveAttribute(cx, wrapper, id,
nativeProperties->attributes,
nativeProperties->attributeIds,
nativeProperties->attributeSpecs, desc)) {
return false;
}
if (desc->obj) {
return true;
}
}
if (nativeProperties->unforgeableAttributes) {
if (!XrayResolveAttribute(cx, wrapper, id,
nativeProperties->unforgeableAttributes,
nativeProperties->unforgeableAttributeIds,
nativeProperties->unforgeableAttributeSpecs,
desc)) {
return false;
}
if (desc->obj) {
return true;
}
}
}
if (nativeProperties->constants) {
Prefable<ConstantSpec>* constant;
for (constant = nativeProperties->constants; constant->specs; ++constant) {
if (constant->enabled) {
// 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, JSObject* wrapper, JSObject* obj,
size_t protoAndIfaceArrayIndex, unsigned attrs,
JSPropertyDescriptor* desc)
{
JSObject* global = 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, JSObject* wrapper,
const NativePropertyHooks* nativePropertyHooks,
DOMObjectType type, JSObject* obj, 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, id, desc, type,
nativeProperties.regular)) {
return false;
}
if (!desc->obj &&
nativeProperties.chromeOnly &&
xpc::AccessCheck::isChrome(js::GetObjectCompartment(wrapper)) &&
!XrayResolveProperty(cx, wrapper, id, desc, type,
nativeProperties.chromeOnly)) {
return false;
}
return true;
}
bool
XrayResolveNativeProperty(JSContext* cx, JSObject* wrapper, JSObject* obj,
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(Prefable<JSPropertySpec>* attributes,
jsid* attributeIds, JSPropertySpec* attributeSpecs,
unsigned flags, JS::AutoIdVector& props)
{
for (; attributes->specs; ++attributes) {
if (attributes->enabled) {
// 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(unsigned flags, JS::AutoIdVector& props,
DOMObjectType type,
const NativeProperties* nativeProperties)
{
Prefable<JSFunctionSpec>* methods;
jsid* methodIds;
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) {
Prefable<JSFunctionSpec>* method;
for (method = methods; method->specs; ++method) {
if (method->enabled) {
// 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(nativeProperties->staticAttributes,
nativeProperties->staticAttributeIds,
nativeProperties->staticAttributeSpecs,
flags, props)) {
return false;
}
} else {
if (nativeProperties->attributes &&
!XrayEnumerateAttributes(nativeProperties->attributes,
nativeProperties->attributeIds,
nativeProperties->attributeSpecs,
flags, props)) {
return false;
}
if (nativeProperties->unforgeableAttributes &&
!XrayEnumerateAttributes(nativeProperties->unforgeableAttributes,
nativeProperties->unforgeableAttributeIds,
nativeProperties->unforgeableAttributeSpecs,
flags, props)) {
return false;
}
}
if (nativeProperties->constants) {
Prefable<ConstantSpec>* constant;
for (constant = nativeProperties->constants; constant->specs; ++constant) {
if (constant->enabled) {
// 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, JSObject* wrapper,
const NativePropertyHooks* nativePropertyHooks,
DOMObjectType type, 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(flags, props, type, nativeProperties.regular)) {
return false;
}
if (nativeProperties.chromeOnly &&
xpc::AccessCheck::isChrome(js::GetObjectCompartment(wrapper)) &&
!XrayEnumerateProperties(flags, props, type, nativeProperties.chromeOnly)) {
return false;
}
return true;
}
bool
XrayEnumerateProperties(JSContext* cx, JSObject* wrapper, 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, JSObject* proxy, jsid id, bool* found,
JS::Value* vp)
{
JSObject* proto;
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, JSObject* proxy, DOMProxyHandler* handler,
jsid id)
{
Maybe<JSAutoCompartment> ac;
if (xpc::WrapperFactory::IsXrayWrapper(proxy)) {
proxy = js::UnwrapObject(proxy);
ac.construct(cx, proxy);
}
MOZ_ASSERT(js::IsProxy(proxy) && js::GetProxyHandler(proxy) == handler);
bool found;
// We ignore an error from GetPropertyOnPrototype.
return !GetPropertyOnPrototype(cx, proxy, id, &found, NULL) || found;
}
bool
WrapCallbackInterface(JSContext *cx, JSObject *scope, nsISupports* callback,
JS::Value* vp)
{
nsCOMPtr<nsIXPConnectWrappedJS> wrappedJS = do_QueryInterface(callback);
MOZ_ASSERT(wrappedJS, "How can we not have an XPCWrappedJS here?");
JSObject* obj;
DebugOnly<nsresult> rv = wrappedJS->GetJSObject(&obj);
MOZ_ASSERT(NS_SUCCEEDED(rv) && obj, "What are we wrapping?");
*vp = JS::ObjectValue(*obj);
return JS_WrapValue(cx, vp);
}
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);
}
}
JSContext*
MainThreadDictionaryBase::ParseJSON(const nsAString& aJSON,
mozilla::Maybe<JSAutoRequest>& aAr,
mozilla::Maybe<JSAutoCompartment>& aAc,
JS::Value& aVal)
{
JSContext* cx = nsContentUtils::ThreadJSContextStack()->GetSafeJSContext();
NS_ENSURE_TRUE(cx, nullptr);
JSObject* global = JS_GetGlobalObject(cx);
aAr.construct(cx);
aAc.construct(cx, global);
if (aJSON.IsEmpty()) {
return cx;
}
if (!JS_ParseJSON(cx,
static_cast<const jschar*>(PromiseFlatString(aJSON).get()),
aJSON.Length(), &aVal)) {
return nullptr;
}
return cx;
}
static JSString*
ConcatJSString(JSContext* cx, const char* pre, JSString* str, const char* post)
{
if (!str) {
return nullptr;
}
JSString* preString = JS_NewStringCopyN(cx, pre, strlen(pre));
JSString* postString = 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, JSObject* wrapper, JSObject* obj, const char* pre,
const char* post, JS::Value* v)
{
JSPropertyDescriptor toStringDesc;
toStringDesc.obj = nullptr;
toStringDesc.attrs = 0;
toStringDesc.shortid = 0;
toStringDesc.getter = nullptr;
toStringDesc.setter = nullptr;
toStringDesc.value = JS::UndefinedValue();
if (!XrayResolveNativeProperty(cx, wrapper, obj,
nsXPConnect::GetRuntimeInstance()->GetStringID(XPCJSRuntime::IDX_TO_STRING),
&toStringDesc)) {
return false;
}
JSString* str;
{
JSAutoCompartment ac(cx, obj);
if (toStringDesc.obj) {
JS::Value toString = toStringDesc.value;
if (!JS_WrapValue(cx, &toString)) {
return false;
}
MOZ_ASSERT(JS_ObjectIsCallable(cx, &toString.toObject()));
JS::Value toStringResult;
if (JS_CallFunctionValue(cx, obj, toString, 0, nullptr,
&toStringResult)) {
str = toStringResult.toString();
} else {
str = nullptr;
}
} else {
if (IsDOMProxy(obj)) {
str = js::GetProxyHandler(obj)->obj_toString(cx, obj);
} else if (IsDOMClass(JS_GetClass(obj)) ||
IsDOMIfaceAndProtoClass(JS_GetClass(obj))) {
str = ConcatJSString(cx, "[object ",
JS_NewStringCopyZ(cx, JS_GetClass(obj)->name),
"]");
} 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);
}
} // namespace dom
} // namespace mozilla