https://github.com/mozilla/gecko-dev
Tip revision: a5cd37d5f47ecb7118d8804b928a5ac4ccf6a7fd authored by ffxbld on 08 September 2011, 19:36:56 UTC
Added tag FENNEC_7_0b5_BUILD1 for changeset 386311c39987. CLOSED TREE a=release
Added tag FENNEC_7_0b5_BUILD1 for changeset 386311c39987. CLOSED TREE a=release
Tip revision: a5cd37d
jswrapper.cpp
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
* May 28, 2008.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Andreas Gal <gal@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "jsapi.h"
#include "jscntxt.h"
#include "jsgc.h"
#include "jsgcmark.h"
#include "jsiter.h"
#include "jsnum.h"
#include "jsregexp.h"
#include "jswrapper.h"
#include "methodjit/PolyIC.h"
#include "methodjit/MonoIC.h"
#ifdef JS_METHODJIT
# include "assembler/jit/ExecutableAllocator.h"
#endif
#include "jscompartment.h"
#include "jsobjinlines.h"
using namespace js;
using namespace js::gc;
static int sWrapperFamily;
void *
JSWrapper::getWrapperFamily()
{
return &sWrapperFamily;
}
bool
JSObject::isWrapper() const
{
return isProxy() && getProxyHandler()->family() == &sWrapperFamily;
}
JSObject *
JSObject::unwrap(uintN *flagsp)
{
JSObject *wrapped = this;
uintN flags = 0;
while (wrapped->isWrapper()) {
flags |= static_cast<JSWrapper *>(wrapped->getProxyHandler())->flags();
wrapped = wrapped->getProxyPrivate().toObjectOrNull();
if (wrapped->getClass()->ext.innerObject)
break;
}
if (flagsp)
*flagsp = flags;
return wrapped;
}
JSWrapper::JSWrapper(uintN flags) : JSProxyHandler(&sWrapperFamily), mFlags(flags)
{
}
JSWrapper::~JSWrapper()
{
}
#define CHECKED(op, act) \
JS_BEGIN_MACRO \
bool status; \
if (!enter(cx, wrapper, id, act, &status)) \
return status; \
bool ok = (op); \
leave(cx, wrapper); \
return ok; \
JS_END_MACRO
#define SET(action) CHECKED(action, SET)
#define GET(action) CHECKED(action, GET)
bool
JSWrapper::getPropertyDescriptor(JSContext *cx, JSObject *wrapper, jsid id,
bool set, PropertyDescriptor *desc)
{
desc->obj = NULL; // default result if we refuse to perform this action
CHECKED(JS_GetPropertyDescriptorById(cx, wrappedObject(wrapper), id, JSRESOLVE_QUALIFIED,
Jsvalify(desc)), set ? SET : GET);
}
static bool
GetOwnPropertyDescriptor(JSContext *cx, JSObject *obj, jsid id, uintN flags, JSPropertyDescriptor *desc)
{
// If obj is a proxy, we can do better than just guessing. This is
// important for certain types of wrappers that wrap other wrappers.
if (obj->isProxy()) {
return JSProxy::getOwnPropertyDescriptor(cx, obj, id,
flags & JSRESOLVE_ASSIGNING,
Valueify(desc));
}
if (!JS_GetPropertyDescriptorById(cx, obj, id, flags, desc))
return false;
if (desc->obj != obj)
desc->obj = NULL;
return true;
}
bool
JSWrapper::getOwnPropertyDescriptor(JSContext *cx, JSObject *wrapper, jsid id, bool set,
PropertyDescriptor *desc)
{
desc->obj = NULL; // default result if we refuse to perform this action
CHECKED(GetOwnPropertyDescriptor(cx, wrappedObject(wrapper), id, JSRESOLVE_QUALIFIED,
Jsvalify(desc)), set ? SET : GET);
}
bool
JSWrapper::defineProperty(JSContext *cx, JSObject *wrapper, jsid id,
PropertyDescriptor *desc)
{
SET(JS_DefinePropertyById(cx, wrappedObject(wrapper), id, Jsvalify(desc->value),
Jsvalify(desc->getter), Jsvalify(desc->setter), desc->attrs));
}
bool
JSWrapper::getOwnPropertyNames(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
// if we refuse to perform this action, props remains empty
jsid id = JSID_VOID;
GET(GetPropertyNames(cx, wrappedObject(wrapper), JSITER_OWNONLY | JSITER_HIDDEN, &props));
}
static bool
ValueToBoolean(Value *vp, bool *bp)
{
*bp = js_ValueToBoolean(*vp);
return true;
}
bool
JSWrapper::delete_(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
*bp = true; // default result if we refuse to perform this action
Value v;
SET(JS_DeletePropertyById2(cx, wrappedObject(wrapper), id, Jsvalify(&v)) &&
ValueToBoolean(&v, bp));
}
bool
JSWrapper::enumerate(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
// if we refuse to perform this action, props remains empty
static jsid id = JSID_VOID;
GET(GetPropertyNames(cx, wrappedObject(wrapper), 0, &props));
}
bool
JSWrapper::fix(JSContext *cx, JSObject *wrapper, Value *vp)
{
vp->setUndefined();
return true;
}
static bool
Cond(JSBool b, bool *bp)
{
*bp = !!b;
return true;
}
bool
JSWrapper::has(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
*bp = false; // default result if we refuse to perform this action
JSBool found;
GET(JS_HasPropertyById(cx, wrappedObject(wrapper), id, &found) &&
Cond(found, bp));
}
bool
JSWrapper::hasOwn(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
*bp = false; // default result if we refuse to perform this action
PropertyDescriptor desc;
JSObject *wobj = wrappedObject(wrapper);
GET(JS_GetPropertyDescriptorById(cx, wobj, id, JSRESOLVE_QUALIFIED, Jsvalify(&desc)) &&
Cond(desc.obj == wobj, bp));
}
bool
JSWrapper::get(JSContext *cx, JSObject *wrapper, JSObject *receiver, jsid id, Value *vp)
{
vp->setUndefined(); // default result if we refuse to perform this action
GET(wrappedObject(wrapper)->getProperty(cx, receiver, id, vp));
}
bool
JSWrapper::set(JSContext *cx, JSObject *wrapper, JSObject *receiver, jsid id, bool strict,
Value *vp)
{
// FIXME (bug 596351): Need deal with strict mode.
SET(wrappedObject(wrapper)->setProperty(cx, id, vp, false));
}
bool
JSWrapper::keys(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
// if we refuse to perform this action, props remains empty
const jsid id = JSID_VOID;
GET(GetPropertyNames(cx, wrappedObject(wrapper), JSITER_OWNONLY, &props));
}
bool
JSWrapper::iterate(JSContext *cx, JSObject *wrapper, uintN flags, Value *vp)
{
vp->setUndefined(); // default result if we refuse to perform this action
const jsid id = JSID_VOID;
GET(GetIterator(cx, wrappedObject(wrapper), flags, vp));
}
bool
JSWrapper::call(JSContext *cx, JSObject *wrapper, uintN argc, Value *vp)
{
vp->setUndefined(); // default result if we refuse to perform this action
const jsid id = JSID_VOID;
CHECKED(JSProxyHandler::call(cx, wrapper, argc, vp), CALL);
}
bool
JSWrapper::construct(JSContext *cx, JSObject *wrapper, uintN argc, Value *argv, Value *vp)
{
vp->setUndefined(); // default result if we refuse to perform this action
const jsid id = JSID_VOID;
GET(JSProxyHandler::construct(cx, wrapper, argc, argv, vp));
}
bool
JSWrapper::hasInstance(JSContext *cx, JSObject *wrapper, const Value *vp, bool *bp)
{
*bp = false; // default result if we refuse to perform this action
const jsid id = JSID_VOID;
JSBool b = JS_FALSE;
GET(JS_HasInstance(cx, wrappedObject(wrapper), Jsvalify(*vp), &b) && Cond(b, bp));
}
JSType
JSWrapper::typeOf(JSContext *cx, JSObject *wrapper)
{
return TypeOfValue(cx, ObjectValue(*wrappedObject(wrapper)));
}
JSString *
JSWrapper::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 = obj_toStringHelper(cx, wrappedObject(wrapper));
leave(cx, wrapper);
return str;
}
JSString *
JSWrapper::fun_toString(JSContext *cx, JSObject *wrapper, uintN 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}");
js::Value v = ObjectValue(*wrapper);
js_ReportIsNotFunction(cx, &v, 0);
return NULL;
}
return NULL;
}
JSString *str = JSProxyHandler::fun_toString(cx, wrapper, indent);
leave(cx, wrapper);
return str;
}
bool
JSWrapper::defaultValue(JSContext *cx, JSObject *wrapper, JSType hint, Value *vp)
{
*vp = ObjectValue(*wrappedObject(wrapper));
if (hint == JSTYPE_VOID)
return ToPrimitive(cx, vp);
return ToPrimitive(cx, hint, vp);
}
void
JSWrapper::trace(JSTracer *trc, JSObject *wrapper)
{
MarkObject(trc, *wrappedObject(wrapper), "wrappedObject");
}
bool
JSWrapper::enter(JSContext *cx, JSObject *wrapper, jsid id, Action act, bool *bp)
{
*bp = true;
return true;
}
void
JSWrapper::leave(JSContext *cx, JSObject *wrapper)
{
}
JSWrapper JSWrapper::singleton((uintN)0);
JSObject *
JSWrapper::New(JSContext *cx, JSObject *obj, JSObject *proto, JSObject *parent,
JSWrapper *handler)
{
JS_ASSERT(parent);
if (obj->isXML()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_WRAP_XML_OBJECT);
return NULL;
}
return NewProxyObject(cx, handler, ObjectValue(*obj), proto, parent,
obj->isCallable() ? obj : NULL, NULL);
}
/* Compartments. */
namespace js {
extern JSObject *
TransparentObjectWrapper(JSContext *cx, JSObject *obj, JSObject *wrappedProto, JSObject *parent,
uintN flags)
{
// Allow wrapping outer window proxies.
JS_ASSERT(!obj->isWrapper() || obj->getClass()->ext.innerObject);
return JSWrapper::New(cx, obj, wrappedProto, parent, &JSCrossCompartmentWrapper::singleton);
}
}
ForceFrame::ForceFrame(JSContext *cx, JSObject *target)
: context(cx),
target(target),
frame(NULL)
{
}
ForceFrame::~ForceFrame()
{
context->delete_(frame);
}
bool
ForceFrame::enter()
{
frame = context->new_<DummyFrameGuard>();
if (!frame)
return false;
LeaveTrace(context);
JS_ASSERT(context->compartment == target->compartment());
JSObject *scopeChain = target->getGlobal();
JS_ASSERT(scopeChain->isNative());
return context->stack.pushDummyFrame(context, *scopeChain, frame);
}
AutoCompartment::AutoCompartment(JSContext *cx, JSObject *target)
: context(cx),
origin(cx->compartment),
target(target),
destination(target->getCompartment()),
entered(false)
{
}
AutoCompartment::~AutoCompartment()
{
if (entered)
leave();
}
bool
AutoCompartment::enter()
{
JS_ASSERT(!entered);
if (origin != destination) {
LeaveTrace(context);
context->compartment = destination;
JSObject *scopeChain = target->getGlobal();
JS_ASSERT(scopeChain->isNative());
frame.construct();
if (!context->stack.pushDummyFrame(context, *scopeChain, &frame.ref())) {
context->compartment = origin;
return false;
}
if (context->isExceptionPending())
context->wrapPendingException();
}
entered = true;
return true;
}
void
AutoCompartment::leave()
{
JS_ASSERT(entered);
if (origin != destination) {
frame.destroy();
context->resetCompartment();
}
entered = false;
}
/* Cross compartment wrappers. */
JSCrossCompartmentWrapper::JSCrossCompartmentWrapper(uintN flags)
: JSWrapper(CROSS_COMPARTMENT | flags)
{
}
JSCrossCompartmentWrapper::~JSCrossCompartmentWrapper()
{
}
#define PIERCE(cx, wrapper, mode, pre, op, post) \
JS_BEGIN_MACRO \
AutoCompartment call(cx, wrappedObject(wrapper)); \
if (!call.enter()) \
return false; \
bool ok = (pre) && (op); \
call.leave(); \
return ok && (post); \
JS_END_MACRO
#define NOTHING (true)
bool
JSCrossCompartmentWrapper::getPropertyDescriptor(JSContext *cx, JSObject *wrapper, jsid id,
bool set, PropertyDescriptor *desc)
{
PIERCE(cx, wrapper, set ? SET : GET,
call.destination->wrapId(cx, &id),
JSWrapper::getPropertyDescriptor(cx, wrapper, id, set, desc),
call.origin->wrap(cx, desc));
}
bool
JSCrossCompartmentWrapper::getOwnPropertyDescriptor(JSContext *cx, JSObject *wrapper, jsid id,
bool set, PropertyDescriptor *desc)
{
PIERCE(cx, wrapper, set ? SET : GET,
call.destination->wrapId(cx, &id),
JSWrapper::getOwnPropertyDescriptor(cx, wrapper, id, set, desc),
call.origin->wrap(cx, desc));
}
bool
JSCrossCompartmentWrapper::defineProperty(JSContext *cx, JSObject *wrapper, jsid id, PropertyDescriptor *desc)
{
AutoPropertyDescriptorRooter desc2(cx, desc);
PIERCE(cx, wrapper, SET,
call.destination->wrapId(cx, &id) && call.destination->wrap(cx, &desc2),
JSWrapper::defineProperty(cx, wrapper, id, &desc2),
NOTHING);
}
bool
JSCrossCompartmentWrapper::getOwnPropertyNames(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
PIERCE(cx, wrapper, GET,
NOTHING,
JSWrapper::getOwnPropertyNames(cx, wrapper, props),
call.origin->wrap(cx, props));
}
bool
JSCrossCompartmentWrapper::delete_(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
PIERCE(cx, wrapper, SET,
call.destination->wrapId(cx, &id),
JSWrapper::delete_(cx, wrapper, id, bp),
NOTHING);
}
bool
JSCrossCompartmentWrapper::enumerate(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
PIERCE(cx, wrapper, GET,
NOTHING,
JSWrapper::enumerate(cx, wrapper, props),
call.origin->wrap(cx, props));
}
bool
JSCrossCompartmentWrapper::has(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
PIERCE(cx, wrapper, GET,
call.destination->wrapId(cx, &id),
JSWrapper::has(cx, wrapper, id, bp),
NOTHING);
}
bool
JSCrossCompartmentWrapper::hasOwn(JSContext *cx, JSObject *wrapper, jsid id, bool *bp)
{
PIERCE(cx, wrapper, GET,
call.destination->wrapId(cx, &id),
JSWrapper::hasOwn(cx, wrapper, id, bp),
NOTHING);
}
bool
JSCrossCompartmentWrapper::get(JSContext *cx, JSObject *wrapper, JSObject *receiver, jsid id, Value *vp)
{
PIERCE(cx, wrapper, GET,
call.destination->wrap(cx, &receiver) && call.destination->wrapId(cx, &id),
JSWrapper::get(cx, wrapper, receiver, id, vp),
call.origin->wrap(cx, vp));
}
bool
JSCrossCompartmentWrapper::set(JSContext *cx, JSObject *wrapper, JSObject *receiver, jsid id,
bool strict, Value *vp)
{
AutoValueRooter tvr(cx, *vp);
PIERCE(cx, wrapper, SET,
call.destination->wrap(cx, &receiver) &&
call.destination->wrapId(cx, &id) &&
call.destination->wrap(cx, tvr.addr()),
JSWrapper::set(cx, wrapper, receiver, id, strict, tvr.addr()),
NOTHING);
}
bool
JSCrossCompartmentWrapper::keys(JSContext *cx, JSObject *wrapper, AutoIdVector &props)
{
PIERCE(cx, wrapper, GET,
NOTHING,
JSWrapper::keys(cx, wrapper, props),
call.origin->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())->getClass() == &js_IteratorClass &&
(obj->getNativeIterator()->flags & JSITER_ENUMERATE);
}
struct AutoCloseIterator
{
AutoCloseIterator(JSContext *cx, JSObject *obj) : cx(cx), obj(obj) {}
~AutoCloseIterator() { if (obj) js_CloseIterator(cx, obj); }
void clear() { obj = NULL; }
private:
JSContext *cx;
JSObject *obj;
};
static bool
Reify(JSContext *cx, JSCompartment *origin, Value *vp)
{
JSObject *iterObj = &vp->toObject();
NativeIterator *ni = iterObj->getNativeIterator();
AutoCloseIterator close(cx, iterObj);
/* Wrap the iteratee. */
JSObject *obj = ni->obj;
if (!origin->wrap(cx, &obj))
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.resize(length))
return false;
for (size_t i = 0; i < length; ++i) {
keys[i] = ni->begin()[i];
if (!origin->wrapId(cx, &keys[i]))
return false;
}
}
close.clear();
if (!js_CloseIterator(cx, iterObj))
return false;
if (isKeyIter)
return VectorToKeyIterator(cx, obj, ni->flags, keys, vp);
return VectorToValueIterator(cx, obj, ni->flags, keys, vp);
}
bool
JSCrossCompartmentWrapper::iterate(JSContext *cx, JSObject *wrapper, uintN flags, Value *vp)
{
PIERCE(cx, wrapper, GET,
NOTHING,
JSWrapper::iterate(cx, wrapper, flags, vp),
CanReify(vp) ? Reify(cx, call.origin, vp) : call.origin->wrap(cx, vp));
}
bool
JSCrossCompartmentWrapper::call(JSContext *cx, JSObject *wrapper, uintN argc, Value *vp)
{
AutoCompartment call(cx, wrappedObject(wrapper));
if (!call.enter())
return false;
vp[0] = ObjectValue(*call.target);
if (!call.destination->wrap(cx, &vp[1]))
return false;
Value *argv = JS_ARGV(cx, vp);
for (size_t n = 0; n < argc; ++n) {
if (!call.destination->wrap(cx, &argv[n]))
return false;
}
if (!JSWrapper::call(cx, wrapper, argc, vp))
return false;
call.leave();
return call.origin->wrap(cx, vp);
}
bool
JSCrossCompartmentWrapper::construct(JSContext *cx, JSObject *wrapper, uintN argc, Value *argv,
Value *rval)
{
AutoCompartment call(cx, wrappedObject(wrapper));
if (!call.enter())
return false;
for (size_t n = 0; n < argc; ++n) {
if (!call.destination->wrap(cx, &argv[n]))
return false;
}
if (!JSWrapper::construct(cx, wrapper, argc, argv, rval))
return false;
call.leave();
return call.origin->wrap(cx, rval);
}
bool
JSCrossCompartmentWrapper::hasInstance(JSContext *cx, JSObject *wrapper, const Value *vp, bool *bp)
{
AutoCompartment call(cx, wrappedObject(wrapper));
if (!call.enter())
return false;
Value v = *vp;
if (!call.destination->wrap(cx, &v))
return false;
return JSWrapper::hasInstance(cx, wrapper, &v, bp);
}
JSString *
JSCrossCompartmentWrapper::obj_toString(JSContext *cx, JSObject *wrapper)
{
AutoCompartment call(cx, wrappedObject(wrapper));
if (!call.enter())
return NULL;
JSString *str = JSWrapper::obj_toString(cx, wrapper);
if (!str)
return NULL;
call.leave();
if (!call.origin->wrap(cx, &str))
return NULL;
return str;
}
JSString *
JSCrossCompartmentWrapper::fun_toString(JSContext *cx, JSObject *wrapper, uintN indent)
{
AutoCompartment call(cx, wrappedObject(wrapper));
if (!call.enter())
return NULL;
JSString *str = JSWrapper::fun_toString(cx, wrapper, indent);
if (!str)
return NULL;
call.leave();
if (!call.origin->wrap(cx, &str))
return NULL;
return str;
}
bool
JSCrossCompartmentWrapper::defaultValue(JSContext *cx, JSObject *wrapper, JSType hint, Value *vp)
{
AutoCompartment call(cx, wrappedObject(wrapper));
if (!call.enter())
return false;
if (!JSWrapper::defaultValue(cx, wrapper, hint, vp))
return false;
call.leave();
return call.origin->wrap(cx, vp);
}
JSCrossCompartmentWrapper JSCrossCompartmentWrapper::singleton(0u);