gecko/js/ipc/ObjectWrapperParent.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=80:
*
* ***** 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.org code.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Ben Newman <b{enjam,newma}n@mozilla.com> (original author)
*
* 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 "mozilla/jsipc/ObjectWrapperParent.h"
#include "mozilla/jsipc/ContextWrapperParent.h"
#include "mozilla/jsipc/CPOWTypes.h"
#include "mozilla/unused.h"
#include "jsobj.h"
#include "jsfun.h"
#include "jsutil.h"
using namespace mozilla::jsipc;
namespace {
// Only need one reserved slot because the ObjectWrapperParent* is
// stored in the private slot.
static const uintN sFlagsSlot = 0;
static const uintN sNumSlots = 1;
static const uintN CPOW_FLAG_RESOLVING = 1 << 0;
class AutoResolveFlag
{
JSContext* mContext;
JSObject* mObj;
uintN mOldFlags;
JS_DECL_USE_GUARD_OBJECT_NOTIFIER;
static uintN GetFlags(JSContext* cx, JSObject* obj) {
jsval v;
#ifdef DEBUG
JSBool ok =
#endif
JS_GetReservedSlot(cx, obj, sFlagsSlot, &v);
NS_ASSERTION(ok, "Failed to get CPOW flags");
return JSVAL_TO_INT(v);
}
static uintN SetFlags(JSContext* cx, JSObject* obj, uintN flags) {
uintN oldFlags = GetFlags(cx, obj);
if (oldFlags != flags)
JS_SetReservedSlot(cx, obj, sFlagsSlot, INT_TO_JSVAL(flags));
return oldFlags;
}
public:
AutoResolveFlag(JSContext* cx,
JSObject* obj
JS_GUARD_OBJECT_NOTIFIER_PARAM)
: mContext(cx)
, mObj(obj)
, mOldFlags(SetFlags(cx, obj,
GetFlags(cx, obj) | CPOW_FLAG_RESOLVING))
{
JS_GUARD_OBJECT_NOTIFIER_INIT;
}
~AutoResolveFlag() {
SetFlags(mContext, mObj, mOldFlags);
}
static JSBool IsSet(JSContext* cx, JSObject* obj) {
return GetFlags(cx, obj) & CPOW_FLAG_RESOLVING;
}
};
class StatusMemberOwner
{
OperationStatus mStatus;
public:
StatusMemberOwner() : mStatus(JS_FALSE) {}
OperationStatus* StatusPtr() {
return &mStatus;
}
};
typedef AutoCheckOperationBase<StatusMemberOwner> ACOBase;
class AutoCheckOperation : public ACOBase
{
JS_DECL_USE_GUARD_OBJECT_NOTIFIER;
public:
AutoCheckOperation(JSContext* cx,
ObjectWrapperParent* owp
JS_GUARD_OBJECT_NOTIFIER_PARAM)
: ACOBase(cx, owp)
{
JS_GUARD_OBJECT_NOTIFIER_INIT;
}
};
}
void
ObjectWrapperParent::CheckOperation(JSContext* cx,
OperationStatus* status)
{
NS_PRECONDITION(status->type() != OperationStatus::T__None,
"Checking an uninitialized operation.");
switch (status->type()) {
case OperationStatus::TJSVariant:
{
jsval thrown;
if (jsval_from_JSVariant(cx, status->get_JSVariant(), &thrown))
JS_SetPendingException(cx, thrown);
*status = JS_FALSE;
}
break;
case OperationStatus::TJSBool:
if (!status->get_JSBool() && !JS_IsExceptionPending(cx)) {
NS_WARNING("CPOW operation failed without setting an exception.");
}
break;
default:
NS_NOTREACHED("Invalid or uninitialized OperationStatus type.");
break;
}
}
template <typename RType>
static RType
with_error(JSContext* cx,
RType rval,
const char* error = NULL)
{
if (!JS_IsExceptionPending(cx))
JS_ReportError(cx, error ? error : "Unspecified CPOW error");
return rval;
}
const js::Class ObjectWrapperParent::sCPOW_JSClass = {
"CrossProcessObjectWrapper",
JSCLASS_NEW_RESOLVE | JSCLASS_NEW_ENUMERATE |
JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(sNumSlots),
js::Valueify(ObjectWrapperParent::CPOW_AddProperty),
js::Valueify(ObjectWrapperParent::CPOW_DelProperty),
js::Valueify(ObjectWrapperParent::CPOW_GetProperty),
js::Valueify(ObjectWrapperParent::CPOW_SetProperty),
(JSEnumerateOp) ObjectWrapperParent::CPOW_NewEnumerate,
(JSResolveOp) ObjectWrapperParent::CPOW_NewResolve,
js::Valueify(ObjectWrapperParent::CPOW_Convert),
ObjectWrapperParent::CPOW_Finalize,
nsnull, // reserved1
nsnull, // checkAccess
js::Valueify(ObjectWrapperParent::CPOW_Call),
js::Valueify(ObjectWrapperParent::CPOW_Construct),
nsnull, // xdrObject
js::Valueify(ObjectWrapperParent::CPOW_HasInstance),
nsnull, // mark
{
js::Valueify(ObjectWrapperParent::CPOW_Equality),
nsnull, // outerObject
nsnull, // innerObject
nsnull, // iteratorObject
nsnull, // wrappedObject
}
};
void
ObjectWrapperParent::ActorDestroy(ActorDestroyReason)
{
if (mObj) {
mObj->setPrivate(NULL);
mObj = NULL;
}
}
ContextWrapperParent*
ObjectWrapperParent::Manager()
{
PContextWrapperParent* pcwp = PObjectWrapperParent::Manager();
return static_cast<ContextWrapperParent*>(pcwp);
}
JSObject*
ObjectWrapperParent::GetJSObject(JSContext* cx) const
{
js::Class *clasp = const_cast<js::Class *>(&ObjectWrapperParent::sCPOW_JSClass);
if (!mObj && (mObj = JS_NewObject(cx, js::Jsvalify(clasp), NULL, NULL))) {
JS_SetPrivate(cx, mObj, (void*)this);
JS_SetReservedSlot(cx, mObj, sFlagsSlot, JSVAL_ZERO);
}
return mObj;
}
static ObjectWrapperParent*
Unwrap(JSContext* cx, JSObject* obj)
{
while (obj->getClass() != &ObjectWrapperParent::sCPOW_JSClass)
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if (!(obj = obj->getProto()))
return NULL;
ObjectWrapperParent* self =
static_cast<ObjectWrapperParent*>(JS_GetPrivate(cx, obj));
NS_ASSERTION(!self || self->GetJSObject(cx) == obj,
"Wrapper and wrapped object disagree?");
return self;
}
/*static*/ bool
ObjectWrapperParent::jsval_to_JSVariant(JSContext* cx, jsval from,
JSVariant* to)
{
switch (JS_TypeOfValue(cx, from)) {
case JSTYPE_VOID:
*to = void_t();
return true;
case JSTYPE_NULL:
if (from != JSVAL_NULL)
return false;
// fall through
case JSTYPE_FUNCTION:
// CPOWs can fool JS_TypeOfValue into returning JSTYPE_FUNCTION
// because they have a call hook, but CPOWs are really objects, so
// fall through to the JSTYPE_OBJECT case:
case JSTYPE_OBJECT:
{
PObjectWrapperParent* powp;
if (!JSObject_to_PObjectWrapperParent(cx, JSVAL_TO_OBJECT(from), &powp))
return with_error(cx, false, "Cannot pass parent-created object to child");
*to = powp;
}
return true;
case JSTYPE_STRING:
*to = nsDependentString((PRUnichar*)JS_GetStringChars(JSVAL_TO_STRING(from)),
JS_GetStringLength(JSVAL_TO_STRING(from)));
return true;
case JSTYPE_NUMBER:
if (JSVAL_IS_INT(from))
*to = JSVAL_TO_INT(from);
else if (JSVAL_IS_DOUBLE(from))
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*to = JSVAL_TO_DOUBLE(from);
else return false;
return true;
case JSTYPE_BOOLEAN:
*to = !!JSVAL_TO_BOOLEAN(from);
return true;
case JSTYPE_XML:
return with_error(cx, false, "CPOWs currently cannot handle JSTYPE_XML");
default:
return with_error(cx, false, "Bad jsval type");
}
}
/*static*/ bool
ObjectWrapperParent::jsval_from_JSVariant(JSContext* cx, const JSVariant& from,
jsval* to)
{
switch (from.type()) {
case JSVariant::Tvoid_t:
*to = JSVAL_VOID;
return true;
case JSVariant::TPObjectWrapperParent:
return jsval_from_PObjectWrapperParent(cx, from.get_PObjectWrapperParent(), to);
case JSVariant::TnsString:
{
JSString* str = JS_NewUCStringCopyZ(cx, from.get_nsString().BeginReading());
if (!str)
return false;
*to = STRING_TO_JSVAL(str);
return true;
}
case JSVariant::Tint:
*to = INT_TO_JSVAL(from.get_int());
return true;
case JSVariant::Tdouble:
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return !!JS_NewNumberValue(cx, from.get_double(), to);
case JSVariant::Tbool:
*to = BOOLEAN_TO_JSVAL(from.get_bool());
return true;
default:
return false;
}
}
/*static*/ bool
ObjectWrapperParent::
JSObject_to_PObjectWrapperParent(JSContext* cx, JSObject* from,
PObjectWrapperParent** to)
{
if (!from) {
*to = NULL;
return true;
}
ObjectWrapperParent* owp = Unwrap(cx, from);
if (!owp)
return false;
*to = owp;
return true;
}
/*static*/ bool
ObjectWrapperParent::
JSObject_from_PObjectWrapperParent(JSContext* cx,
const PObjectWrapperParent* from,
JSObject** to)
{
const ObjectWrapperParent* owp =
static_cast<const ObjectWrapperParent*>(from);
*to = owp
? owp->GetJSObject(cx)
: JSVAL_TO_OBJECT(JSVAL_NULL);
return true;
}
/*static*/ bool
ObjectWrapperParent::
jsval_from_PObjectWrapperParent(JSContext* cx,
const PObjectWrapperParent* from,
jsval* to)
{
JSObject* obj;
if (!JSObject_from_PObjectWrapperParent(cx, from, &obj))
return false;
*to = OBJECT_TO_JSVAL(obj);
return true;
}
static bool
jsid_from_int(JSContext* cx, int from, jsid* to)
{
jsval v = INT_TO_JSVAL(from);
return JS_ValueToId(cx, v, to);
}
static bool
jsid_from_nsString(JSContext* cx, const nsString& from, jsid* to)
{
JSString* str = JS_NewUCStringCopyZ(cx, from.BeginReading());
if (!str)
return false;
return JS_ValueToId(cx, STRING_TO_JSVAL(str), to);
}
static bool
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jsval_to_nsString(JSContext* cx, jsid from, nsString* to)
{
JSString* str;
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jsval idval;
if (JS_IdToValue(cx, from, &idval) &&
(str = JS_ValueToString(cx, idval))) {
*to = JS_GetStringChars(str);
return true;
}
return false;
}
/*static*/ JSBool
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ObjectWrapperParent::CPOW_AddProperty(JSContext *cx, JSObject *obj, jsid id,
jsval *vp)
{
CPOW_LOG(("Calling CPOW_AddProperty (%s)...",
JSVAL_TO_CSTR(cx, id)));
ObjectWrapperParent* self = Unwrap(cx, obj);
if (!self)
return with_error(cx, JS_FALSE, "Unwrapping failed in CPOW_AddProperty");
if (AutoResolveFlag::IsSet(cx, obj))
return JS_TRUE;
AutoCheckOperation aco(cx, self);
nsString in_id;
if (!jsval_to_nsString(cx, id, &in_id))
return JS_FALSE;
return (self->Manager()->RequestRunToCompletion() &&
self->CallAddProperty(in_id,
aco.StatusPtr()) &&
aco.Ok());
}
/*static*/ JSBool
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ObjectWrapperParent::CPOW_GetProperty(JSContext *cx, JSObject *obj, jsid id,
jsval *vp)
{
CPOW_LOG(("Calling CPOW_GetProperty (%s)...",
JSVAL_TO_CSTR(cx, id)));
ObjectWrapperParent* self = Unwrap(cx, obj);
if (!self)
return with_error(cx, JS_FALSE, "Unwrapping failed in CPOW_GetProperty");
AutoCheckOperation aco(cx, self);
nsString in_id;
if (!jsval_to_nsString(cx, id, &in_id))
return JS_FALSE;
JSVariant out_v;
return (self->Manager()->RequestRunToCompletion() &&
self->CallGetProperty(in_id,
aco.StatusPtr(), &out_v) &&
aco.Ok() &&
self->jsval_from_JSVariant(cx, out_v, vp));
}
/*static*/ JSBool
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ObjectWrapperParent::CPOW_SetProperty(JSContext *cx, JSObject *obj, jsid id,
jsval *vp)
{
CPOW_LOG(("Calling CPOW_SetProperty (%s)...",
JSVAL_TO_CSTR(cx, id)));
ObjectWrapperParent* self = Unwrap(cx, obj);
if (!self)
return with_error(cx, JS_FALSE, "Unwrapping failed in CPOW_SetProperty");
AutoCheckOperation aco(cx, self);
nsString in_id;
JSVariant in_v;
if (!jsval_to_nsString(cx, id, &in_id) ||
!self->jsval_to_JSVariant(cx, *vp, &in_v))
return JS_FALSE;
JSVariant out_v;
return (self->Manager()->RequestRunToCompletion() &&
self->CallSetProperty(in_id, in_v,
aco.StatusPtr(), &out_v) &&
aco.Ok() &&
self->jsval_from_JSVariant(cx, out_v, vp));
}
/*static*/ JSBool
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ObjectWrapperParent::CPOW_DelProperty(JSContext *cx, JSObject *obj, jsid id,
jsval *vp)
{
CPOW_LOG(("Calling CPOW_DelProperty (%s)...",
JSVAL_TO_CSTR(cx, id)));
ObjectWrapperParent* self = Unwrap(cx, obj);
if (!self)
return with_error(cx, JS_FALSE, "Unwrapping failed in CPOW_DelProperty");
AutoCheckOperation aco(cx, self);
nsString in_id;
if (!jsval_to_nsString(cx, id, &in_id))
return JS_FALSE;
JSVariant out_v;
return (self->Manager()->RequestRunToCompletion() &&
self->CallDelProperty(in_id,
aco.StatusPtr(), &out_v) &&
aco.Ok() &&
jsval_from_JSVariant(cx, out_v, vp));
}
JSBool
ObjectWrapperParent::NewEnumerateInit(JSContext* cx, jsval* statep, jsid* idp)
{
AutoCheckOperation aco(cx, this);
JSVariant out_state;
int out_id;
return (CallNewEnumerateInit(aco.StatusPtr(), &out_state, &out_id) &&
aco.Ok() &&
jsval_from_JSVariant(cx, out_state, statep) &&
(!idp || jsid_from_int(cx, out_id, idp)));
}
JSBool
ObjectWrapperParent::NewEnumerateNext(JSContext* cx, jsval* statep, jsid* idp)
{
AutoCheckOperation aco(cx, this);
JSVariant in_state;
if (!jsval_to_JSVariant(cx, *statep, &in_state))
return JS_FALSE;
JSVariant out_state;
nsString out_id;
if (CallNewEnumerateNext(in_state,
aco.StatusPtr(), &out_state, &out_id) &&
aco.Ok() &&
jsval_from_JSVariant(cx, out_state, statep) &&
jsid_from_nsString(cx, out_id, idp))
{
JSObject* obj = GetJSObject(cx);
AutoResolveFlag arf(cx, obj);
return JS_DefinePropertyById(cx, obj, *idp, JSVAL_VOID, NULL, NULL,
JSPROP_ENUMERATE);
}
return JS_FALSE;
}
JSBool
ObjectWrapperParent::NewEnumerateDestroy(JSContext* cx, jsval state)
{
AutoCheckOperation aco(cx, this);
JSVariant in_state;
if (!jsval_to_JSVariant(cx, state, &in_state))
return JS_FALSE;
return SendNewEnumerateDestroy(in_state);
}
/*static*/ JSBool
ObjectWrapperParent::CPOW_NewEnumerate(JSContext *cx, JSObject *obj,
JSIterateOp enum_op, jsval *statep,
jsid *idp)
{
CPOW_LOG(("Calling CPOW_NewEnumerate..."));
ObjectWrapperParent* self = Unwrap(cx, obj);
if (!self)
return with_error(cx, JS_FALSE, "Unwrapping failed in CPOW_NewEnumerate");
switch (enum_op) {
case JSENUMERATE_INIT:
case JSENUMERATE_INIT_ALL:
self->Manager()->RequestRunToCompletion();
return self->NewEnumerateInit(cx, statep, idp);
case JSENUMERATE_NEXT:
return self->NewEnumerateNext(cx, statep, idp);
case JSENUMERATE_DESTROY:
return self->NewEnumerateDestroy(cx, *statep);
}
NS_NOTREACHED("Unknown enum_op value in CPOW_NewEnumerate");
return JS_FALSE;
}
/*static*/ JSBool
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ObjectWrapperParent::CPOW_NewResolve(JSContext *cx, JSObject *obj, jsid id,
uintN flags, JSObject **objp)
{
CPOW_LOG(("Calling CPOW_NewResolve (%s)...",
JSVAL_TO_CSTR(cx, id)));
ObjectWrapperParent* self = Unwrap(cx, obj);
if (!self)
return with_error(cx, JS_FALSE, "Unwrapping failed in CPOW_NewResolve");
AutoCheckOperation aco(cx, self);
nsString in_id;
if (!jsval_to_nsString(cx, id, &in_id))
return JS_FALSE;
PObjectWrapperParent* out_pobj;
if (!self->Manager()->RequestRunToCompletion() ||
!self->CallNewResolve(in_id, flags,
aco.StatusPtr(), &out_pobj) ||
!aco.Ok() ||
!JSObject_from_PObjectWrapperParent(cx, out_pobj, objp))
return JS_FALSE;
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if (*objp) {
AutoResolveFlag arf(cx, *objp);
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JS_DefinePropertyById(cx, *objp, id, JSVAL_VOID, NULL, NULL,
JSPROP_ENUMERATE);
}
return JS_TRUE;
}
/*static*/ JSBool
ObjectWrapperParent::CPOW_Convert(JSContext *cx, JSObject *obj, JSType type,
jsval *vp)
{
CPOW_LOG(("Calling CPOW_Convert (to %s)...",
JS_GetTypeName(cx, type)));
ObjectWrapperParent* self = Unwrap(cx, obj);
if (!self)
return with_error(cx, JS_FALSE, "Unwrapping failed in CPOW_Convert");
*vp = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
}
/*static*/ void
ObjectWrapperParent::CPOW_Finalize(JSContext* cx, JSObject* obj)
{
CPOW_LOG(("Calling CPOW_Finalize..."));
ObjectWrapperParent* self = Unwrap(cx, obj);
if (self) {
self->mObj = NULL;
unused << ObjectWrapperParent::Send__delete__(self);
}
}
/*static*/ JSBool
ObjectWrapperParent::CPOW_Call(JSContext* cx, JSObject* obj, uintN argc,
jsval* argv, jsval* rval)
{
CPOW_LOG(("Calling CPOW_Call..."));
ObjectWrapperParent* function =
Unwrap(cx, JSVAL_TO_OBJECT(JS_ARGV_CALLEE(argv)));
if (!function)
return with_error(cx, JS_FALSE, "Could not unwrap CPOW function");
AutoCheckOperation aco(cx, function);
ObjectWrapperParent* receiver = Unwrap(cx, obj);
if (!receiver) {
// Substitute child global for parent global object.
// TODO First make sure we're really replacing the global object?
ContextWrapperParent* manager =
static_cast<ContextWrapperParent*>(function->Manager());
receiver = manager->GetGlobalObjectWrapper();
}
nsTArray<JSVariant> in_argv(argc);
for (uintN i = 0; i < argc; i++)
if (!jsval_to_JSVariant(cx, argv[i], in_argv.AppendElement()))
return JS_FALSE;
JSVariant out_rval;
return (function->Manager()->RequestRunToCompletion() &&
function->CallCall(receiver, in_argv,
aco.StatusPtr(), &out_rval) &&
aco.Ok() &&
jsval_from_JSVariant(cx, out_rval, rval));
}
/*static*/ JSBool
ObjectWrapperParent::CPOW_Construct(JSContext *cx, JSObject *obj, uintN argc,
jsval *argv, jsval *rval)
{
CPOW_LOG(("Calling CPOW_Construct..."));
ObjectWrapperParent* constructor =
Unwrap(cx, JSVAL_TO_OBJECT(JS_ARGV_CALLEE(argv)));
if (!constructor)
return with_error(cx, JS_FALSE, "Could not unwrap CPOW constructor function");
AutoCheckOperation aco(cx, constructor);
nsTArray<JSVariant> in_argv(argc);
for (uintN i = 0; i < argc; i++)
if (!jsval_to_JSVariant(cx, argv[i], in_argv.AppendElement()))
return JS_FALSE;
PObjectWrapperParent* out_powp;
return (constructor->Manager()->RequestRunToCompletion() &&
constructor->CallConstruct(in_argv,
aco.StatusPtr(), &out_powp) &&
aco.Ok() &&
jsval_from_PObjectWrapperParent(cx, out_powp, rval));
}
/*static*/ JSBool
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ObjectWrapperParent::CPOW_HasInstance(JSContext *cx, JSObject *obj, const jsval *v,
JSBool *bp)
{
CPOW_LOG(("Calling CPOW_HasInstance..."));
*bp = JS_FALSE;
ObjectWrapperParent* self = Unwrap(cx, obj);
if (!self)
return with_error(cx, JS_FALSE, "Unwrapping failed in CPOW_HasInstance");
AutoCheckOperation aco(cx, self);
JSVariant in_v;
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if (!jsval_to_JSVariant(cx, *v, &in_v))
return JS_FALSE;
return (self->Manager()->RequestRunToCompletion() &&
self->CallHasInstance(in_v,
aco.StatusPtr(), bp) &&
aco.Ok());
}
/*static*/ JSBool
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ObjectWrapperParent::CPOW_Equality(JSContext *cx, JSObject *obj, const jsval *v,
JSBool *bp)
{
CPOW_LOG(("Calling CPOW_Equality..."));
*bp = JS_FALSE;
ObjectWrapperParent* self = Unwrap(cx, obj);
if (!self)
return with_error(cx, JS_FALSE, "Unwrapping failed in CPOW_Equality");
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if (JSVAL_IS_PRIMITIVE(*v))
return JS_TRUE;
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ObjectWrapperParent* other = Unwrap(cx, JSVAL_TO_OBJECT(*v));
if (!other)
return JS_TRUE;
*bp = (self == other);
return JS_TRUE;
}