gecko/js/jetpack/JetpackActorCommon.cpp

562 lines
14 KiB
C++

/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
/* ***** 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 Firefox.
*
* The Initial Developer of the Original Code is
* the Mozilla Foundation <http://www.mozilla.org>.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Ben Newman <mozilla@benjamn.com> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 "base/basictypes.h"
#include "jscntxt.h"
#include "jsapi.h"
#include "jstl.h"
#include "jshashtable.h"
#include "mozilla/jetpack/JetpackActorCommon.h"
#include "mozilla/jetpack/PJetpack.h"
#include "mozilla/jetpack/PHandleParent.h"
#include "mozilla/jetpack/PHandleChild.h"
#include "mozilla/jetpack/Handle.h"
using mozilla::jetpack::JetpackActorCommon;
using mozilla::jetpack::PHandleParent;
using mozilla::jetpack::HandleParent;
using mozilla::jetpack::PHandleChild;
using mozilla::jetpack::HandleChild;
using mozilla::jetpack::KeyValue;
using mozilla::jetpack::PrimVariant;
using mozilla::jetpack::CompVariant;
using mozilla::jetpack::Variant;
class JetpackActorCommon::OpaqueSeenType
{
public:
typedef JSObject* KeyType;
typedef size_t IdType;
typedef js::HashMap<
KeyType, IdType,
js::DefaultHasher<KeyType>,
js::SystemAllocPolicy
> MapType;
OpaqueSeenType() {
(void) map.init(1);
}
bool ok() { return map.initialized(); }
// Reserving 0 as an invalid ID means starting the valid IDs at 1. We
// could have reserved a dummy first element of rmap, but that would
// have wasted space.
static const IdType kInvalidId = 0;
bool add(KeyType obj, IdType* id) {
MapType::AddPtr ap = map.lookupForAdd(obj);
if (!ap) {
if (!rmap.AppendElement(obj) ||
!map.add(ap, obj, *id = rmap.Length()))
*id = kInvalidId;
return true;
}
*id = ap->value;
return false;
}
KeyType reverseLookup(IdType id) {
return rmap.SafeElementAt(id - 1, NULL);
}
private:
MapType map;
nsAutoTArray<KeyType, 4> rmap;
};
bool
JetpackActorCommon::jsval_to_PrimVariant(JSContext* cx, JSType type, jsval from,
PrimVariant* to)
{
// A false return from this function just means the value couldn't be
// converted to a PrimVariant (i.e., it wasn't a primitive value).
switch (type) {
case JSTYPE_VOID:
*to = void_t();
return true;
case JSTYPE_NULL:
*to = null_t();
return true;
case JSTYPE_FUNCTION:
return false;
case JSTYPE_OBJECT: {
HandleParent* hp = HandleParent::FromJSVal(cx, from);
HandleChild* hc = HandleChild::FromJSVal(cx, from);
NS_ASSERTION(!hc || !hp, "Can't be both a parent and a child");
if (hp) {
*to = hp;
return true;
}
if (hc) {
*to = hc;
return true;
}
return false;
}
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))
*to = JSVAL_TO_DOUBLE(from);
else
return false;
return true;
case JSTYPE_BOOLEAN:
*to = !!JSVAL_TO_BOOLEAN(from);
return true;
case JSTYPE_XML:
return false;
default:
return false;
}
}
bool
JetpackActorCommon::jsval_to_CompVariant(JSContext* cx, JSType type, jsval from,
CompVariant* to, OpaqueSeenType* seen)
{
if (type != JSTYPE_OBJECT)
return false;
js::LazilyConstructed<OpaqueSeenType> lost;
if (!seen) {
lost.construct();
seen = lost.addr();
if (!seen->ok())
return false;
}
OpaqueSeenType::KeyType obj = JSVAL_TO_OBJECT(from);
OpaqueSeenType::IdType id;
if (!seen->add(obj, &id)) {
if (OpaqueSeenType::kInvalidId == id)
return false;
*to = CompVariant(id);
return true;
}
if (JS_IsArrayObject(cx, obj)) {
nsTArray<Variant> elems;
jsuint len;
if (!JS_GetArrayLength(cx, obj, &len) ||
!elems.SetCapacity(len))
return false;
for (jsuint i = 0; i < len; ++i) {
jsval val;
Variant* vp = elems.AppendElement();
if (!JS_GetElement(cx, obj, i, &val) ||
!jsval_to_Variant(cx, val, vp, seen))
*vp = void_t();
}
InfallibleTArray<Variant> outElems;
outElems.SwapElements(elems);
*to = outElems;
return true;
}
js::AutoIdArray ida(cx, JS_Enumerate(cx, obj));
if (!ida)
return false;
nsTArray<KeyValue> kvs;
for (size_t i = 0; i < ida.length(); ++i) {
jsval val; // reused for both key and value
if (!JS_IdToValue(cx, ida[i], &val))
return false;
JSString* idStr = JS_ValueToString(cx, val);
if (!idStr)
return false;
if (!JS_GetPropertyById(cx, obj, ida[i], &val))
return false;
KeyValue kv;
// Silently drop properties that can't be converted.
if (jsval_to_Variant(cx, val, &kv.value(), seen)) {
kv.key() = nsDependentString((PRUnichar*)JS_GetStringChars(idStr),
JS_GetStringLength(idStr));
// If AppendElement fails, we lose this property, no big deal.
kvs.AppendElement(kv);
}
}
InfallibleTArray<KeyValue> outKvs;
outKvs.SwapElements(kvs);
*to = outKvs;
return true;
}
bool
JetpackActorCommon::jsval_to_Variant(JSContext* cx, jsval from, Variant* to,
OpaqueSeenType* seen)
{
JSType type = JS_TypeOfValue(cx, from);
if (JSVAL_IS_NULL(from))
type = JSTYPE_NULL;
PrimVariant pv;
if (jsval_to_PrimVariant(cx, type, from, &pv)) {
*to = pv;
return true;
}
CompVariant cv;
if (jsval_to_CompVariant(cx, type, from, &cv, seen)) {
*to = cv;
return true;
}
return false;
}
bool
JetpackActorCommon::jsval_from_PrimVariant(JSContext* cx,
const PrimVariant& from,
jsval* to)
{
switch (from.type()) {
case PrimVariant::Tvoid_t:
*to = JSVAL_VOID;
return true;
case PrimVariant::Tnull_t:
*to = JSVAL_NULL;
return true;
case PrimVariant::Tbool:
*to = from.get_bool() ? JSVAL_TRUE : JSVAL_FALSE;
return true;
case PrimVariant::Tint:
*to = INT_TO_JSVAL(from.get_int());
return true;
case PrimVariant::Tdouble:
return !!JS_NewNumberValue(cx, from.get_double(), to);
case PrimVariant::TnsString: {
const nsString& str = from.get_nsString();
// TODO Use some sort of sharedstring/stringbuffer abstraction to
// exploit sharing opportunities more generally.
if (!str.Length()) {
*to = JS_GetEmptyStringValue(cx);
return true;
}
JSString* s =
JS_NewUCStringCopyN(cx, str.get(), str.Length());
if (!s)
return false;
*to = STRING_TO_JSVAL(s);
return true;
}
case PrimVariant::TPHandleParent: {
JSObject* hobj =
static_cast<HandleParent*>(from.get_PHandleParent())->ToJSObject(cx);
if (!hobj)
return false;
*to = OBJECT_TO_JSVAL(hobj);
return true;
}
case PrimVariant::TPHandleChild: {
JSObject* hobj =
static_cast<HandleChild*>(from.get_PHandleChild())->ToJSObject(cx);
if (!hobj)
return false;
*to = OBJECT_TO_JSVAL(hobj);
return true;
}
default:
return false;
}
}
bool
JetpackActorCommon::jsval_from_CompVariant(JSContext* cx,
const CompVariant& from,
jsval* to,
OpaqueSeenType* seen)
{
js::LazilyConstructed<OpaqueSeenType> lost;
if (!seen) {
lost.construct();
seen = lost.addr();
if (!seen->ok())
return false;
}
JSObject* obj = NULL;
switch (from.type()) {
case CompVariant::TArrayOfKeyValue: {
if (!(obj = JS_NewObject(cx, NULL, NULL, NULL)))
return false;
js::AutoObjectRooter root(cx, obj);
OpaqueSeenType::IdType ignored;
if (!seen->add(obj, &ignored))
return false;
const nsTArray<KeyValue>& kvs = from.get_ArrayOfKeyValue();
for (PRUint32 i = 0; i < kvs.Length(); ++i) {
const KeyValue& kv = kvs.ElementAt(i);
js::AutoValueRooter toSet(cx);
if (!jsval_from_Variant(cx, kv.value(), toSet.jsval_addr(), seen) ||
!JS_SetUCProperty(cx, obj,
kv.key().get(),
kv.key().Length(),
toSet.jsval_addr()))
return false;
}
break;
}
case CompVariant::TArrayOfVariant: {
const nsTArray<Variant>& vs = from.get_ArrayOfVariant();
nsAutoTArray<jsval, 8> jsvals;
jsval* elems = jsvals.AppendElements(vs.Length());
if (!elems)
return false;
for (PRUint32 i = 0; i < vs.Length(); ++i)
elems[i] = JSVAL_VOID;
js::AutoArrayRooter root(cx, vs.Length(), elems);
OpaqueSeenType::IdType ignored;
if (!seen->add(obj, &ignored))
return false;
for (PRUint32 i = 0; i < vs.Length(); ++i)
if (!jsval_from_Variant(cx, vs.ElementAt(i), elems + i, seen))
return false;
if (!(obj = JS_NewArrayObject(cx, vs.Length(), elems)))
return false;
break;
}
case CompVariant::Tsize_t:
if (!(obj = seen->reverseLookup(from.get_size_t())))
return false;
break;
default:
return false;
}
*to = OBJECT_TO_JSVAL(obj);
return true;
}
bool
JetpackActorCommon::jsval_from_Variant(JSContext* cx, const Variant& from,
jsval* to, OpaqueSeenType* seen)
{
switch (from.type()) {
case Variant::TPrimVariant:
return jsval_from_PrimVariant(cx, from, to);
case Variant::TCompVariant:
return jsval_from_CompVariant(cx, from, to, seen);
default:
return false;
}
}
bool
JetpackActorCommon::RecvMessage(JSContext* cx,
const nsString& messageName,
const InfallibleTArray<Variant>& data,
InfallibleTArray<Variant>* results)
{
if (results)
results->Clear();
RecList* list;
if (!mReceivers.Get(messageName, &list))
return true;
nsAutoTArray<jsval, 4> snapshot;
list->copyTo(snapshot);
if (!snapshot.Length())
return true;
nsAutoTArray<jsval, 4> args;
PRUint32 argc = data.Length() + 1;
jsval* argv = args.AppendElements(argc);
if (!argv)
return false;
for (PRUint32 i = 0; i < argc; ++i)
argv[i] = JSVAL_VOID;
js::AutoArrayRooter argvRooter(cx, argc, argv);
JSString* msgNameStr =
JS_NewUCStringCopyN(cx,
messageName.get(),
messageName.Length());
if (!msgNameStr)
return false;
argv[0] = STRING_TO_JSVAL(msgNameStr);
for (PRUint32 i = 0; i < data.Length(); ++i)
if (!jsval_from_Variant(cx, data.ElementAt(i), argv + i + 1))
return false;
JSObject* implGlobal = JS_GetGlobalObject(cx);
js::AutoValueRooter rval(cx);
JSAutoEnterCompartment ac;
if (!ac.enter(cx, implGlobal))
return false;
for (PRUint32 i = 0; i < snapshot.Length(); ++i) {
Variant* vp = results ? results->AppendElement() : NULL;
rval.set(JSVAL_VOID);
if (!JS_CallFunctionValue(cx, implGlobal, snapshot[i], argc, argv,
rval.jsval_addr())) {
(void) JS_ReportPendingException(cx);
if (vp)
*vp = void_t();
} else if (vp && !jsval_to_Variant(cx, rval.jsval_value(), vp))
*vp = void_t();
}
return true;
}
JetpackActorCommon::RecList::~RecList()
{
while (mHead) {
RecNode* old = mHead;
mHead = mHead->down;
delete old;
}
}
void
JetpackActorCommon::RecList::add(jsval v)
{
RecNode* node = mHead, *tail = NULL;
while (node) {
if (node->value() == v)
return;
node = (tail = node)->down;
}
node = new RecNode(mCx, v);
if (tail)
tail->down = node;
else
mHead = node;
}
void
JetpackActorCommon::RecList::remove(jsval v)
{
while (mHead && mHead->value() == v) {
RecNode* old = mHead;
mHead = mHead->down;
delete old;
}
if (!mHead)
return;
RecNode* prev = mHead, *node = prev->down;
while (node) {
if (node->value() == v) {
prev->down = node->down;
delete node;
}
node = (prev = node)->down;
}
}
void
JetpackActorCommon::RecList::copyTo(nsTArray<jsval>& dst) const
{
dst.Clear();
for (RecNode* node = mHead; node; node = node->down)
dst.AppendElement(node->value());
}
nsresult
JetpackActorCommon::RegisterReceiver(JSContext* cx,
const nsString& messageName,
jsval receiver)
{
if (JS_TypeOfValue(cx, receiver) != JSTYPE_FUNCTION)
return NS_ERROR_INVALID_ARG;
RecList* list;
if (!mReceivers.Get(messageName, &list)) {
list = new RecList(cx);
if (!list || !mReceivers.Put(messageName, list)) {
delete list;
return NS_ERROR_OUT_OF_MEMORY;
}
}
list->add(receiver);
return NS_OK;
}
void
JetpackActorCommon::UnregisterReceiver(const nsString& messageName,
jsval receiver)
{
RecList* list;
if (!mReceivers.Get(messageName, &list))
return;
list->remove(receiver);
}