https://github.com/mozilla/gecko-dev
Tip revision: 4de65ed647cfede012c65e5b42268b52a3c32ff3 authored by seabld on 31 January 2013, 03:42:17 UTC
Added tag SEAMONKEY_2_16b3_RELEASE for changeset FIREFOX_19_0b4_BUILD1. CLOSED TREE a=release
Added tag SEAMONKEY_2_16b3_RELEASE for changeset FIREFOX_19_0b4_BUILD1. CLOSED TREE a=release
Tip revision: 4de65ed
jswrapper.cpp
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99:
*
* 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 "jsapi.h"
#include "jscntxt.h"
#include "jscompartment.h"
#include "jsexn.h"
#include "jsgc.h"
#include "jsiter.h"
#include "jsnum.h"
#include "jswrapper.h"
#ifdef JS_METHODJIT
# include "assembler/jit/ExecutableAllocator.h"
#endif
#include "gc/Marking.h"
#include "methodjit/PolyIC.h"
#include "methodjit/MonoIC.h"
#include "jsobjinlines.h"
#include "builtin/Iterator-inl.h"
#include "vm/RegExpObject-inl.h"
using namespace js;
using namespace js::gc;
namespace js {
int sWrapperFamily;
}
void *
Wrapper::getWrapperFamily()
{
return &sWrapperFamily;
}
JSObject *
Wrapper::New(JSContext *cx, JSObject *obj, JSObject *proto, JSObject *parent,
Wrapper *handler)
{
JS_ASSERT(parent);
AutoMarkInDeadCompartment amd(cx->compartment);
#if JS_HAS_XML_SUPPORT
if (obj->isXML()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_WRAP_XML_OBJECT);
return NULL;
}
#endif
return NewProxyObject(cx, handler, ObjectValue(*obj), proto, parent,
obj->isCallable() ? obj : NULL, NULL);
}
JSObject *
Wrapper::Renew(JSContext *cx, JSObject *existing, JSObject *obj, Wrapper *handler)
{
#if JS_HAS_XML_SUPPORT
if (obj->isXML()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_WRAP_XML_OBJECT);
return NULL;
}
#endif
JS_ASSERT(!obj->isCallable());
return RenewProxyObject(cx, existing, handler, ObjectValue(*obj));
}
Wrapper *
Wrapper::wrapperHandler(RawObject wrapper)
{
JS_ASSERT(wrapper->isWrapper());
return static_cast<Wrapper*>(GetProxyHandler(wrapper));
}
JSObject *
Wrapper::wrappedObject(RawObject wrapper)
{
JS_ASSERT(wrapper->isWrapper());
return GetProxyTargetObject(wrapper);
}
bool
Wrapper::enter(JSContext *cx, JSObject *wrapper, jsid id, Action act, bool *bp)
{
*bp = true;
return true;
}
JS_FRIEND_API(JSObject *)
js::UnwrapObject(JSObject *wrapped, bool stopAtOuter, unsigned *flagsp)
{
unsigned flags = 0;
while (wrapped->isWrapper() &&
!JS_UNLIKELY(stopAtOuter && wrapped->getClass()->ext.innerObject)) {
flags |= Wrapper::wrapperHandler(wrapped)->flags();
wrapped = GetProxyPrivate(wrapped).toObjectOrNull();
}
if (flagsp)
*flagsp = flags;
return wrapped;
}
JS_FRIEND_API(JSObject *)
js::UnwrapObjectChecked(RawObject obj)
{
while (true) {
JSObject *wrapper = obj;
obj = UnwrapOneChecked(obj);
if (!obj || obj == wrapper)
return obj;
}
}
JS_FRIEND_API(JSObject *)
js::UnwrapOneChecked(RawObject obj)
{
// Checked unwraps should never unwrap outer windows.
if (!obj->isWrapper() ||
JS_UNLIKELY(!!obj->getClass()->ext.innerObject))
{
return obj;
}
Wrapper *handler = Wrapper::wrapperHandler(obj);
return handler->isSafeToUnwrap() ? Wrapper::wrappedObject(obj) : NULL;
}
bool
js::IsCrossCompartmentWrapper(RawObject wrapper)
{
return wrapper->isWrapper() &&
!!(Wrapper::wrapperHandler(wrapper)->flags() & Wrapper::CROSS_COMPARTMENT);
}
#define CHECKED(op, act) \
JS_BEGIN_MACRO \
bool status; \
if (!enter(cx, wrapper, id, act, &status)) \
return status; \
return (op); \
JS_END_MACRO
#define SET(action) CHECKED(action, SET)
#define GET(action) CHECKED(action, GET)
Wrapper::Wrapper(unsigned flags, bool hasPrototype) : DirectProxyHandler(&sWrapperFamily)
, mFlags(flags)
, mSafeToUnwrap(true)
{
setHasPrototype(hasPrototype);
}
Wrapper::~Wrapper()
{
}
bool
Wrapper::getPropertyDescriptor(JSContext *cx, JSObject *wrapper,
jsid id, bool set,
PropertyDescriptor *desc)
{
JS_ASSERT(!hasPrototype()); // Should never be called when there's a prototype.
desc->obj = NULL; // default result if we refuse to perform this action
CHECKED(DirectProxyHandler::getPropertyDescriptor(cx, wrapper, id, set, desc),
set ? SET : GET);
}
bool
Wrapper::getOwnPropertyDescriptor(JSContext *cx, JSObject *wrapper,
jsid id, bool set,
PropertyDescriptor *desc)
{
desc->obj = NULL; // default result if we refuse to perform this action
CHECKED(DirectProxyHandler::getOwnPropertyDescriptor(cx, wrapper, id, set, desc), GET);
}
bool
Wrapper::defineProperty(JSContext *cx, JSObject *wrapper, jsid id,
PropertyDescriptor *desc)
{
SET(DirectProxyHandler::defineProperty(cx, wrapper, id, desc));
}
bool
Wrapper::getOwnPropertyNames(JSContext *cx, JSObject *wrapper,
AutoIdVector &props)
{
// if we refuse to perform this action, props remains empty
jsid id = JSID_VOID;
GET(DirectProxyHandler::getOwnPropertyNames(cx, wrapper, props));
}
bool
Wrapper::delete_(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
*bp = true; // default result if we refuse to perform this action
SET(DirectProxyHandler::delete_(cx, wrapper, id, bp));
}
bool
Wrapper::enumerate(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
JS_ASSERT(!hasPrototype()); // Should never be called when there's a prototype.
// if we refuse to perform this action, props remains empty
static jsid id = JSID_VOID;
GET(DirectProxyHandler::enumerate(cx, wrapper, props));
}
/*
* Ordinarily, the convert trap would require unwrapping. However, the default
* implementation of convert, JS_ConvertStub, obtains a default value by calling
* the toString/valueOf method on the wrapper, if any. Throwing if we can't unwrap
* in this case would be overly conservative. To make matters worse, XPConnect sometimes
* installs a custom convert trap that obtains a default value by calling the
* toString method on the wrapper. Doing a puncture in this case would be overly
* conservative as well. We deal with these anomalies by falling back to the DefaultValue
* algorithm whenever unwrapping is forbidden.
*/
bool
Wrapper::defaultValue(JSContext *cx, JSObject *wrapper_, JSType hint, Value *vp)
{
RootedObject wrapper(cx, wrapper_);
if (!wrapperHandler(wrapper)->isSafeToUnwrap()) {
RootedValue v(cx);
if (!DefaultValue(cx, wrapper, hint, &v))
return false;
*vp = v;
return true;
}
/*
* We enter the compartment of the wrappee here, even if we're not a cross
* compartment wrapper. Moreover, cross compartment wrappers do not enter
* the compartment of the wrappee before calling this function. This is
* necessary because the DefaultValue algorithm above operates on the
* wrapper, not the wrappee, so we want to delay the decision to switch
* compartments until this point.
*/
AutoCompartment call(cx, wrappedObject(wrapper));
return DirectProxyHandler::defaultValue(cx, wrapper_, hint, vp);
}
bool
Wrapper::has(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
JS_ASSERT(!hasPrototype()); // Should never be called when there's a prototype.
*bp = false; // default result if we refuse to perform this action
GET(DirectProxyHandler::has(cx, wrapper, id, bp));
}
bool
Wrapper::hasOwn(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
*bp = false; // default result if we refuse to perform this action
GET(DirectProxyHandler::hasOwn(cx, wrapper, id, bp));
}
bool
Wrapper::get(JSContext *cx, JSObject *wrapper, JSObject *receiver, jsid id, Value *vp)
{
vp->setUndefined(); // default result if we refuse to perform this action
GET(DirectProxyHandler::get(cx, wrapper, receiver, id, vp));
}
bool
Wrapper::set(JSContext *cx, JSObject *wrapper, JSObject *receiver, jsid id, bool strict,
Value *vp)
{
SET(DirectProxyHandler::set(cx, wrapper, receiver, id, strict, vp));
}
bool
Wrapper::keys(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
// if we refuse to perform this action, props remains empty
const jsid id = JSID_VOID;
GET(DirectProxyHandler::keys(cx, wrapper, props));
}
bool
Wrapper::iterate(JSContext *cx, JSObject *wrapper, unsigned flags, Value *vp)
{
JS_ASSERT(!hasPrototype()); // Should never be called when there's a prototype.
vp->setUndefined(); // default result if we refuse to perform this action
const jsid id = JSID_VOID;
GET(DirectProxyHandler::iterate(cx, wrapper, flags, vp));
}
bool
Wrapper::call(JSContext *cx, JSObject *wrapper, unsigned argc, Value *vp)
{
vp->setUndefined(); // default result if we refuse to perform this action
const jsid id = JSID_VOID;
CHECKED(DirectProxyHandler::call(cx, wrapper, argc, vp), CALL);
}
bool
Wrapper::construct(JSContext *cx, JSObject *wrapper, unsigned argc, Value *argv, Value *vp)
{
vp->setUndefined(); // default result if we refuse to perform this action
const jsid id = JSID_VOID;
CHECKED(DirectProxyHandler::construct(cx, wrapper, argc, argv, vp), CALL);
}
bool
Wrapper::nativeCall(JSContext *cx, IsAcceptableThis test, NativeImpl impl, CallArgs args)
{
const jsid id = JSID_VOID;
Rooted<JSObject*> wrapper(cx, &args.thisv().toObject());
CHECKED(DirectProxyHandler::nativeCall(cx, test, impl, args), CALL);
}
bool
Wrapper::hasInstance(JSContext *cx, HandleObject wrapper, MutableHandleValue v, bool *bp)
{
*bp = false; // default result if we refuse to perform this action
const jsid id = JSID_VOID;
GET(DirectProxyHandler::hasInstance(cx, wrapper, v, bp));
}
JSString *
Wrapper::obj_toString(JSContext *cx, JSObject *wrapper)
{
bool status;
if (!enter(cx, wrapper, JSID_VOID, GET, &status)) {
if (status) {
// Perform some default behavior that doesn't leak any information.
return JS_NewStringCopyZ(cx, "[object Object]");
}
return NULL;
}
JSString *str = DirectProxyHandler::obj_toString(cx, wrapper);
return str;
}
JSString *
Wrapper::fun_toString(JSContext *cx, JSObject *wrapper, unsigned indent)
{
bool status;
if (!enter(cx, wrapper, JSID_VOID, GET, &status)) {
if (status) {
// Perform some default behavior that doesn't leak any information.
if (wrapper->isCallable())
return JS_NewStringCopyZ(cx, "function () {\n [native code]\n}");
ReportIsNotFunction(cx, ObjectValue(*wrapper));
return NULL;
}
return NULL;
}
JSString *str = DirectProxyHandler::fun_toString(cx, wrapper, indent);
return str;
}
Wrapper Wrapper::singleton((unsigned)0);
Wrapper Wrapper::singletonWithPrototype((unsigned)0, true);
/* Compartments. */
extern JSObject *
js::TransparentObjectWrapper(JSContext *cx, JSObject *existing, JSObject *objArg,
JSObject *wrappedProtoArg, JSObject *parentArg,
unsigned flags)
{
RootedObject obj(cx, objArg);
RootedObject wrappedProto(cx, wrappedProtoArg);
RootedObject parent(cx, parentArg);
// Allow wrapping outer window proxies.
JS_ASSERT(!obj->isWrapper() || obj->getClass()->ext.innerObject);
return Wrapper::New(cx, obj, wrappedProto, parent, &CrossCompartmentWrapper::singleton);
}
ErrorCopier::~ErrorCopier()
{
JSContext *cx = ac.ref().context();
if (ac.ref().origin() != cx->compartment && cx->isExceptionPending()) {
Value exc = cx->getPendingException();
if (exc.isObject() && exc.toObject().isError() && exc.toObject().getPrivate()) {
cx->clearPendingException();
ac.destroy();
Rooted<JSObject*> errObj(cx, &exc.toObject());
JSObject *copyobj = js_CopyErrorObject(cx, errObj, scope);
if (copyobj)
cx->setPendingException(ObjectValue(*copyobj));
}
}
}
/* Cross compartment wrappers. */
CrossCompartmentWrapper::CrossCompartmentWrapper(unsigned flags, bool hasPrototype)
: Wrapper(CROSS_COMPARTMENT | flags, hasPrototype)
{
}
CrossCompartmentWrapper::~CrossCompartmentWrapper()
{
}
#define PIERCE(cx, wrapper, mode, pre, op, post) \
JS_BEGIN_MACRO \
bool ok; \
{ \
AutoCompartment call(cx, wrappedObject(wrapper)); \
ok = (pre) && (op); \
} \
return ok && (post); \
JS_END_MACRO
#define NOTHING (true)
bool
CrossCompartmentWrapper::getPropertyDescriptor(JSContext *cx, JSObject *wrapper, jsid id,
bool set, PropertyDescriptor *desc)
{
PIERCE(cx, wrapper, set ? SET : GET,
cx->compartment->wrapId(cx, &id),
Wrapper::getPropertyDescriptor(cx, wrapper, id, set, desc),
cx->compartment->wrap(cx, desc));
}
bool
CrossCompartmentWrapper::getOwnPropertyDescriptor(JSContext *cx, JSObject *wrapper, jsid id,
bool set, PropertyDescriptor *desc)
{
PIERCE(cx, wrapper, set ? SET : GET,
cx->compartment->wrapId(cx, &id),
Wrapper::getOwnPropertyDescriptor(cx, wrapper, id, set, desc),
cx->compartment->wrap(cx, desc));
}
bool
CrossCompartmentWrapper::defineProperty(JSContext *cx, JSObject *wrapper, jsid id, PropertyDescriptor *desc)
{
AutoPropertyDescriptorRooter desc2(cx, desc);
PIERCE(cx, wrapper, SET,
cx->compartment->wrapId(cx, &id) && cx->compartment->wrap(cx, &desc2),
Wrapper::defineProperty(cx, wrapper, id, &desc2),
NOTHING);
}
bool
CrossCompartmentWrapper::getOwnPropertyNames(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
PIERCE(cx, wrapper, GET,
NOTHING,
Wrapper::getOwnPropertyNames(cx, wrapper, props),
cx->compartment->wrap(cx, props));
}
bool
CrossCompartmentWrapper::delete_(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
PIERCE(cx, wrapper, SET,
cx->compartment->wrapId(cx, &id),
Wrapper::delete_(cx, wrapper, id, bp),
NOTHING);
}
bool
CrossCompartmentWrapper::enumerate(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
PIERCE(cx, wrapper, GET,
NOTHING,
Wrapper::enumerate(cx, wrapper, props),
cx->compartment->wrap(cx, props));
}
bool
CrossCompartmentWrapper::has(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
PIERCE(cx, wrapper, GET,
cx->compartment->wrapId(cx, &id),
Wrapper::has(cx, wrapper, id, bp),
NOTHING);
}
bool
CrossCompartmentWrapper::hasOwn(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
PIERCE(cx, wrapper, GET,
cx->compartment->wrapId(cx, &id),
Wrapper::hasOwn(cx, wrapper, id, bp),
NOTHING);
}
bool
CrossCompartmentWrapper::get(JSContext *cx, JSObject *wrapperArg, JSObject *receiverArg,
jsid idArg, Value *vp)
{
RootedObject wrapper(cx, wrapperArg);
RootedObject receiver(cx, receiverArg);
RootedId id(cx, idArg);
PIERCE(cx, wrapper, GET,
cx->compartment->wrap(cx, receiver.address()) && cx->compartment->wrapId(cx, id.address()),
Wrapper::get(cx, wrapper, receiver, id, vp),
cx->compartment->wrap(cx, vp));
}
bool
CrossCompartmentWrapper::set(JSContext *cx, JSObject *wrapper_, JSObject *receiver_, jsid id_,
bool strict, Value *vp)
{
RootedObject wrapper(cx, wrapper_), receiver(cx, receiver_);
RootedId id(cx, id_);
RootedValue value(cx, *vp);
PIERCE(cx, wrapper, SET,
cx->compartment->wrap(cx, receiver.address()) &&
cx->compartment->wrapId(cx, id.address()) &&
cx->compartment->wrap(cx, value.address()),
Wrapper::set(cx, wrapper, receiver, id, strict, value.address()),
NOTHING);
}
bool
CrossCompartmentWrapper::keys(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
PIERCE(cx, wrapper, GET,
NOTHING,
Wrapper::keys(cx, wrapper, props),
cx->compartment->wrap(cx, props));
}
/*
* We can reify non-escaping iterator objects instead of having to wrap them. This
* allows fast iteration over objects across a compartment boundary.
*/
static bool
CanReify(Value *vp)
{
JSObject *obj;
return vp->isObject() &&
(obj = &vp->toObject())->isPropertyIterator() &&
(obj->asPropertyIterator().getNativeIterator()->flags & JSITER_ENUMERATE);
}
struct AutoCloseIterator
{
AutoCloseIterator(JSContext *cx, JSObject *obj) : cx(cx), obj(cx, obj) {}
~AutoCloseIterator() { if (obj) CloseIterator(cx, obj); }
void clear() { obj = NULL; }
private:
JSContext *cx;
RootedObject obj;
};
static bool
Reify(JSContext *cx, JSCompartment *origin, Value *vp)
{
Rooted<PropertyIteratorObject*> iterObj(cx, &vp->toObject().asPropertyIterator());
NativeIterator *ni = iterObj->getNativeIterator();
AutoCloseIterator close(cx, iterObj);
/* Wrap the iteratee. */
RootedObject obj(cx, ni->obj);
if (!origin->wrap(cx, obj.address()))
return false;
/*
* Wrap the elements in the iterator's snapshot.
* N.B. the order of closing/creating iterators is important due to the
* implicit cx->enumerators state.
*/
size_t length = ni->numKeys();
bool isKeyIter = ni->isKeyIter();
AutoIdVector keys(cx);
if (length > 0) {
if (!keys.reserve(length))
return false;
for (size_t i = 0; i < length; ++i) {
jsid id;
if (!ValueToId(cx, StringValue(ni->begin()[i]), &id))
return false;
keys.infallibleAppend(id);
if (!origin->wrapId(cx, &keys[i]))
return false;
}
}
close.clear();
if (!CloseIterator(cx, iterObj))
return false;
RootedValue value(cx, *vp);
if (isKeyIter) {
if (!VectorToKeyIterator(cx, obj, ni->flags, keys, &value))
return false;
} else {
if (!VectorToValueIterator(cx, obj, ni->flags, keys, &value))
return false;
}
*vp = value;
return true;
}
bool
CrossCompartmentWrapper::iterate(JSContext *cx, JSObject *wrapper, unsigned flags, Value *vp)
{
PIERCE(cx, wrapper, GET,
NOTHING,
Wrapper::iterate(cx, wrapper, flags, vp),
CanReify(vp) ? Reify(cx, cx->compartment, vp) : cx->compartment->wrap(cx, vp));
}
bool
CrossCompartmentWrapper::call(JSContext *cx, JSObject *wrapper_, unsigned argc, Value *vp)
{
RootedObject wrapper(cx, wrapper_);
JSObject *wrapped = wrappedObject(wrapper);
{
AutoCompartment call(cx, wrapped);
vp[0] = ObjectValue(*wrapped);
if (!cx->compartment->wrap(cx, &vp[1]))
return false;
Value *argv = JS_ARGV(cx, vp);
for (size_t n = 0; n < argc; ++n) {
if (!cx->compartment->wrap(cx, &argv[n]))
return false;
}
if (!Wrapper::call(cx, wrapper, argc, vp))
return false;
}
return cx->compartment->wrap(cx, vp);
}
bool
CrossCompartmentWrapper::construct(JSContext *cx, JSObject *wrapper_, unsigned argc, Value *argv,
Value *rval)
{
RootedObject wrapper(cx, wrapper_);
JSObject *wrapped = wrappedObject(wrapper);
{
AutoCompartment call(cx, wrapped);
for (size_t n = 0; n < argc; ++n) {
if (!cx->compartment->wrap(cx, &argv[n]))
return false;
}
if (!Wrapper::construct(cx, wrapper, argc, argv, rval))
return false;
}
return cx->compartment->wrap(cx, rval);
}
bool
CrossCompartmentWrapper::nativeCall(JSContext *cx, IsAcceptableThis test, NativeImpl impl,
CallArgs srcArgs)
{
Rooted<JSObject*> wrapper(cx, &srcArgs.thisv().toObject());
JS_ASSERT(srcArgs.thisv().isMagic(JS_IS_CONSTRUCTING) ||
!UnwrapObject(wrapper)->isCrossCompartmentWrapper());
RootedObject wrapped(cx, wrappedObject(wrapper));
{
AutoCompartment call(cx, wrapped);
InvokeArgsGuard dstArgs;
if (!cx->stack.pushInvokeArgs(cx, srcArgs.length(), &dstArgs))
return false;
Value *src = srcArgs.base();
Value *srcend = srcArgs.array() + srcArgs.length();
Value *dst = dstArgs.base();
for (; src < srcend; ++src, ++dst) {
*dst = *src;
if (!cx->compartment->wrap(cx, dst))
return false;
}
if (!CallNonGenericMethod(cx, test, impl, dstArgs))
return false;
srcArgs.rval().set(dstArgs.rval());
dstArgs.pop();
}
return cx->compartment->wrap(cx, srcArgs.rval().address());
}
bool
CrossCompartmentWrapper::hasInstance(JSContext *cx, HandleObject wrapper, MutableHandleValue v, bool *bp)
{
AutoCompartment call(cx, wrappedObject(wrapper));
if (!cx->compartment->wrap(cx, v.address()))
return false;
return Wrapper::hasInstance(cx, wrapper, v, bp);
}
JSString *
CrossCompartmentWrapper::obj_toString(JSContext *cx, JSObject *wrapper)
{
JSString *str = NULL;
{
AutoCompartment call(cx, wrappedObject(wrapper));
str = Wrapper::obj_toString(cx, wrapper);
if (!str)
return NULL;
}
if (!cx->compartment->wrap(cx, &str))
return NULL;
return str;
}
JSString *
CrossCompartmentWrapper::fun_toString(JSContext *cx, JSObject *wrapper, unsigned indent)
{
JSString *str = NULL;
{
AutoCompartment call(cx, wrappedObject(wrapper));
str = Wrapper::fun_toString(cx, wrapper, indent);
if (!str)
return NULL;
}
if (!cx->compartment->wrap(cx, &str))
return NULL;
return str;
}
bool
CrossCompartmentWrapper::regexp_toShared(JSContext *cx, JSObject *wrapper, RegExpGuard *g)
{
AutoCompartment call(cx, wrappedObject(wrapper));
return Wrapper::regexp_toShared(cx, wrapper, g);
}
bool
CrossCompartmentWrapper::defaultValue(JSContext *cx, JSObject *wrapper, JSType hint, Value *vp)
{
if (!Wrapper::defaultValue(cx, wrapper, hint, vp))
return false;
return cx->compartment->wrap(cx, vp);
}
bool
CrossCompartmentWrapper::iteratorNext(JSContext *cx, JSObject *wrapper, Value *vp)
{
PIERCE(cx, wrapper, GET,
NOTHING,
DirectProxyHandler::iteratorNext(cx, wrapper, vp),
cx->compartment->wrap(cx, vp));
}
bool
CrossCompartmentWrapper::getPrototypeOf(JSContext *cx, JSObject *proxy, JSObject **protop)
{
assertSameCompartment(cx, proxy);
if (!proxy->getTaggedProto().isLazy()) {
*protop = proxy->getTaggedProto().toObjectOrNull();
return true;
}
RootedObject proto(cx);
{
RootedObject wrapped(cx, wrappedObject(proxy));
AutoCompartment call(cx, wrapped);
if (!JSObject::getProto(cx, wrapped, &proto))
return false;
if (proto)
proto->setDelegate(cx);
}
if (!proxy->compartment()->wrap(cx, proto.address()))
return false;
*protop = proto;
return true;
}
CrossCompartmentWrapper CrossCompartmentWrapper::singleton(0u);
/* Security wrappers. */
template <class Base>
SecurityWrapper<Base>::SecurityWrapper(unsigned flags)
: Base(flags)
{
Base::setSafeToUnwrap(false);
}
template <class Base>
bool
SecurityWrapper<Base>::nativeCall(JSContext *cx, IsAcceptableThis test, NativeImpl impl,
CallArgs args)
{
/*
* Let this through until compartment-per-global lets us have stronger
* invariants wrt document.domain (bug 714547).
*/
return Base::nativeCall(cx, test, impl, args);
}
template <class Base>
bool
SecurityWrapper<Base>::objectClassIs(JSObject *obj, ESClassValue classValue, JSContext *cx)
{
/*
* Let this through until compartment-per-global lets us have stronger
* invariants wrt document.domain (bug 714547).
*/
return Base::objectClassIs(obj, classValue, cx);
}
template <class Base>
bool
SecurityWrapper<Base>::regexp_toShared(JSContext *cx, JSObject *obj, RegExpGuard *g)
{
return Base::regexp_toShared(cx, obj, g);
}
template class js::SecurityWrapper<Wrapper>;
template class js::SecurityWrapper<CrossCompartmentWrapper>;
namespace js {
DeadObjectProxy::DeadObjectProxy()
: BaseProxyHandler(&sDeadObjectFamily)
{
}
bool
DeadObjectProxy::getPropertyDescriptor(JSContext *cx, JSObject *wrapper,
jsid id, bool set,
PropertyDescriptor *desc)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::getOwnPropertyDescriptor(JSContext *cx, JSObject *wrapper,
jsid id, bool set,
PropertyDescriptor *desc)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::defineProperty(JSContext *cx, JSObject *wrapper, jsid id,
PropertyDescriptor *desc)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::getOwnPropertyNames(JSContext *cx, JSObject *wrapper,
AutoIdVector &props)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::delete_(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::enumerate(JSContext *cx, JSObject *wrapper,
AutoIdVector &props)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::call(JSContext *cx, JSObject *wrapper, unsigned argc, Value *vp)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::construct(JSContext *cx, JSObject *wrapper, unsigned argc,
Value *vp, Value *rval)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::nativeCall(JSContext *cx, IsAcceptableThis test, NativeImpl impl, CallArgs args)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::hasInstance(JSContext *cx, HandleObject proxy, MutableHandleValue v,
bool *bp)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::objectClassIs(JSObject *obj, ESClassValue classValue, JSContext *cx)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
JSString *
DeadObjectProxy::obj_toString(JSContext *cx, JSObject *wrapper)
{
return JS_NewStringCopyZ(cx, "[object DeadObject]");
}
JSString *
DeadObjectProxy::fun_toString(JSContext *cx, JSObject *proxy, unsigned indent)
{
return NULL;
}
bool
DeadObjectProxy::regexp_toShared(JSContext *cx, JSObject *proxy, RegExpGuard *g)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::defaultValue(JSContext *cx, JSObject *obj, JSType hint, Value *vp)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::iteratorNext(JSContext *cx, JSObject *proxy, Value *vp)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::getElementIfPresent(JSContext *cx, JSObject *obj, JSObject *receiver,
uint32_t index, Value *vp, bool *present)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_DEAD_OBJECT);
return false;
}
bool
DeadObjectProxy::getPrototypeOf(JSContext *cx, JSObject *proxy, JSObject **protop)
{
*protop = NULL;
return true;
}
DeadObjectProxy DeadObjectProxy::singleton;
int DeadObjectProxy::sDeadObjectFamily;
} // namespace js
JSObject *
js::NewDeadProxyObject(JSContext *cx, JSObject *parent)
{
return NewProxyObject(cx, &DeadObjectProxy::singleton, NullValue(),
NULL, parent, NULL, NULL);
}
bool
js::IsDeadProxyObject(RawObject obj)
{
return IsProxy(obj) && GetProxyHandler(obj) == &DeadObjectProxy::singleton;
}
static void
NukeSlot(JSObject *wrapper, uint32_t slot, Value v)
{
Value old = wrapper->getSlot(slot);
if (old.isMarkable()) {
Cell *cell = static_cast<Cell *>(old.toGCThing());
AutoMarkInDeadCompartment amd(cell->compartment());
wrapper->setReservedSlot(slot, v);
} else {
wrapper->setReservedSlot(slot, v);
}
}
void
js::NukeCrossCompartmentWrapper(JSContext *cx, JSObject *wrapper)
{
JS_ASSERT(IsCrossCompartmentWrapper(wrapper));
NukeSlot(wrapper, JSSLOT_PROXY_PRIVATE, NullValue());
SetProxyHandler(wrapper, &DeadObjectProxy::singleton);
if (IsFunctionProxy(wrapper)) {
NukeSlot(wrapper, JSSLOT_PROXY_CALL, NullValue());
NukeSlot(wrapper, JSSLOT_PROXY_CONSTRUCT, NullValue());
}
NukeSlot(wrapper, JSSLOT_PROXY_EXTRA + 0, NullValue());
NukeSlot(wrapper, JSSLOT_PROXY_EXTRA + 1, NullValue());
}
/*
* NukeChromeCrossCompartmentWrappersForGlobal reaches into chrome and cuts
* all of the cross-compartment wrappers that point to objects parented to
* obj's global. The snag here is that we need to avoid cutting wrappers that
* point to the window object on page navigation (inner window destruction)
* and only do that on tab close (outer window destruction). Thus the
* option of how to handle the global object.
*/
JS_FRIEND_API(JSBool)
js::NukeCrossCompartmentWrappers(JSContext* cx,
const CompartmentFilter& sourceFilter,
const CompartmentFilter& targetFilter,
js::NukeReferencesToWindow nukeReferencesToWindow)
{
CHECK_REQUEST(cx);
JSRuntime *rt = cx->runtime;
// Iterate through scopes looking for system cross compartment wrappers
// that point to an object that shares a global with obj.
for (CompartmentsIter c(rt); !c.done(); c.next()) {
if (!sourceFilter.match(c))
continue;
// Iterate the wrappers looking for anything interesting.
WrapperMap &pmap = c->crossCompartmentWrappers;
for (WrapperMap::Enum e(pmap); !e.empty(); e.popFront()) {
// Some cross-compartment wrappers are for strings. We're not
// interested in those.
const CrossCompartmentKey &k = e.front().key;
if (k.kind != CrossCompartmentKey::ObjectWrapper)
continue;
AutoWrapperRooter wobj(cx, WrapperValue(e));
JSObject *wrapped = UnwrapObject(wobj);
if (nukeReferencesToWindow == DontNukeWindowReferences &&
wrapped->getClass()->ext.innerObject)
continue;
if (targetFilter.match(wrapped->compartment())) {
// We found a wrapper to nuke.
e.removeFront();
NukeCrossCompartmentWrapper(cx, wobj);
}
}
}
return JS_TRUE;
}
// Given a cross-compartment wrapper |wobj|, update it to point to
// |newTarget|. This recomputes the wrapper with JS_WrapValue, and thus can be
// useful even if wrapper already points to newTarget.
bool
js::RemapWrapper(JSContext *cx, JSObject *wobj, JSObject *newTarget)
{
JS_ASSERT(IsCrossCompartmentWrapper(wobj));
JS_ASSERT(!IsCrossCompartmentWrapper(newTarget));
JSObject *origTarget = Wrapper::wrappedObject(wobj);
JS_ASSERT(origTarget);
Value origv = ObjectValue(*origTarget);
JSCompartment *wcompartment = wobj->compartment();
WrapperMap &pmap = wcompartment->crossCompartmentWrappers;
// If we're mapping to a different target (as opposed to just recomputing
// for the same target), we must not have an existing wrapper for the new
// target, otherwise this will break.
JS_ASSERT_IF(origTarget != newTarget, !pmap.has(ObjectValue(*newTarget)));
// The old value should still be in the cross-compartment wrapper map, and
// the lookup should return wobj.
JS_ASSERT(&pmap.lookup(origv)->value.unsafeGet()->toObject() == wobj);
pmap.remove(origv);
// When we remove origv from the wrapper map, its wrapper, wobj, must
// immediately cease to be a cross-compartment wrapper. Neuter it.
NukeCrossCompartmentWrapper(cx, wobj);
// First, we wrap it in the new compartment. We try to use the existing
// wrapper, |wobj|, since it's been nuked anyway. The wrap() function has
// the choice to reuse |wobj| or not.
JSObject *tobj = newTarget;
AutoCompartment ac(cx, wobj);
if (!wcompartment->wrap(cx, &tobj, wobj))
MOZ_CRASH();
// If wrap() reused |wobj|, it will have overwritten it and returned with
// |tobj == wobj|. Otherwise, |tobj| will point to a new wrapper and |wobj|
// will still be nuked. In the latter case, we replace |wobj| with the
// contents of the new wrapper in |tobj|.
if (tobj != wobj) {
// Now, because we need to maintain object identity, we do a brain
// transplant on the old object so that it contains the contents of the
// new one.
if (!wobj->swap(cx, tobj))
MOZ_CRASH();
}
// Before swapping, this wrapper came out of wrap(), which enforces the
// invariant that the wrapper in the map points directly to the key.
JS_ASSERT(Wrapper::wrappedObject(wobj) == newTarget);
// Update the entry in the compartment's wrapper map to point to the old
// wrapper, which has now been updated (via reuse or swap).
pmap.put(ObjectValue(*newTarget), ObjectValue(*wobj));
return true;
}
// Remap all cross-compartment wrappers pointing to |oldTarget| to point to
// |newTarget|. All wrappers are recomputed.
JS_FRIEND_API(bool)
js::RemapAllWrappersForObject(JSContext *cx, JSObject *oldTarget,
JSObject *newTarget)
{
Value origv = ObjectValue(*oldTarget);
AutoWrapperVector toTransplant(cx);
if (!toTransplant.reserve(cx->runtime->compartments.length()))
return false;
for (CompartmentsIter c(cx->runtime); !c.done(); c.next()) {
WrapperMap &pmap = c->crossCompartmentWrappers;
if (WrapperMap::Ptr wp = pmap.lookup(origv)) {
// We found a wrapper. Remember and root it.
toTransplant.infallibleAppend(WrapperValue(wp));
}
}
for (WrapperValue *begin = toTransplant.begin(), *end = toTransplant.end();
begin != end; ++begin)
{
if (!RemapWrapper(cx, &begin->toObject(), newTarget))
MOZ_CRASH();
}
return true;
}
JS_FRIEND_API(bool)
js::RecomputeWrappers(JSContext *cx, const CompartmentFilter &sourceFilter,
const CompartmentFilter &targetFilter)
{
AutoMaybeTouchDeadCompartments agc(cx);
AutoWrapperVector toRecompute(cx);
for (CompartmentsIter c(cx->runtime); !c.done(); c.next()) {
// Filter by source compartment.
if (!sourceFilter.match(c))
continue;
// Iterate over the wrappers, filtering appropriately.
WrapperMap &pmap = c->crossCompartmentWrappers;
for (WrapperMap::Enum e(pmap); !e.empty(); e.popFront()) {
// Filter out non-objects.
const CrossCompartmentKey &k = e.front().key;
if (k.kind != CrossCompartmentKey::ObjectWrapper)
continue;
// Filter by target compartment.
if (!targetFilter.match(k.wrapped->compartment()))
continue;
// Add it to the list.
if (!toRecompute.append(WrapperValue(e)))
return false;
}
}
// Recompute all the wrappers in the list.
for (WrapperValue *begin = toRecompute.begin(), *end = toRecompute.end(); begin != end; ++begin)
{
JSObject *wrapper = &begin->toObject();
JSObject *wrapped = Wrapper::wrappedObject(wrapper);
if (!RemapWrapper(cx, wrapper, wrapped))
MOZ_CRASH();
}
return true;
}