JavaScriptShared.h
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=80:
*
* 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/. */
#ifndef mozilla_jsipc_JavaScriptShared_h__
#define mozilla_jsipc_JavaScriptShared_h__
#include "mozilla/dom/DOMTypes.h"
#include "mozilla/jsipc/PJavaScript.h"
#include "nsJSUtils.h"
#include "nsFrameMessageManager.h"
namespace mozilla {
namespace jsipc {
typedef uint64_t ObjectId;
class JavaScriptShared;
class CpowIdHolder : public CpowHolder
{
public:
CpowIdHolder(JavaScriptShared* js, const InfallibleTArray<CpowEntry>& cpows)
: js_(js),
cpows_(cpows)
{
}
bool ToObject(JSContext* cx, JS::MutableHandleObject objp);
private:
JavaScriptShared* js_;
const InfallibleTArray<CpowEntry>& cpows_;
};
// Map ids -> JSObjects
class ObjectStore
{
typedef js::DefaultHasher<ObjectId> TableKeyHasher;
typedef js::HashMap<ObjectId, JS::Heap<JSObject*>, TableKeyHasher, js::SystemAllocPolicy> ObjectTable;
public:
ObjectStore();
bool init();
void trace(JSTracer* trc);
bool add(ObjectId id, JSObject* obj);
JSObject* find(ObjectId id);
void remove(ObjectId id);
private:
ObjectTable table_;
};
// Map JSObjects -> ids
class ObjectIdCache
{
typedef js::PointerHasher<JSObject*, 3> Hasher;
typedef js::HashMap<JSObject*, ObjectId, Hasher, js::SystemAllocPolicy> ObjectIdTable;
public:
ObjectIdCache();
~ObjectIdCache();
bool init();
void trace(JSTracer* trc);
bool add(JSContext* cx, JSObject* obj, ObjectId id);
ObjectId find(JSObject* obj);
void remove(JSObject* obj);
private:
static void keyMarkCallback(JSTracer* trc, JSObject* key, void* data);
ObjectIdTable* table_;
};
class JavaScriptShared
{
public:
bool init();
static const uint32_t OBJECT_EXTRA_BITS = 1;
static const uint32_t OBJECT_IS_CALLABLE = (1 << 0);
bool Unwrap(JSContext* cx, const InfallibleTArray<CpowEntry>& aCpows, JS::MutableHandleObject objp);
bool Wrap(JSContext* cx, JS::HandleObject aObj, InfallibleTArray<CpowEntry>* outCpows);
protected:
bool toVariant(JSContext* cx, JS::HandleValue from, JSVariant* to);
bool toValue(JSContext* cx, const JSVariant& from, JS::MutableHandleValue to);
bool fromDescriptor(JSContext* cx, JS::Handle<JSPropertyDescriptor> desc, PPropertyDescriptor* out);
bool toDescriptor(JSContext* cx, const PPropertyDescriptor& in,
JS::MutableHandle<JSPropertyDescriptor> out);
bool convertIdToGeckoString(JSContext* cx, JS::HandleId id, nsString* to);
bool convertGeckoStringToId(JSContext* cx, const nsString& from, JS::MutableHandleId id);
bool toValue(JSContext* cx, const JSVariant& from, jsval* to) {
JS::RootedValue v(cx);
if (!toValue(cx, from, &v))
return false;
*to = v;
return true;
}
virtual bool makeId(JSContext* cx, JSObject* obj, ObjectId* idp) = 0;
virtual JSObject* unwrap(JSContext* cx, ObjectId id) = 0;
bool unwrap(JSContext* cx, ObjectId id, JS::MutableHandle<JSObject*> objp) {
if (!id) {
objp.set(nullptr);
return true;
}
objp.set(unwrap(cx, id));
return bool(objp.get());
}
static void ConvertID(const nsID& from, JSIID* to);
static void ConvertID(const JSIID& from, nsID* to);
JSObject* findObject(uint32_t objId) {
return objects_.find(objId);
}
protected:
ObjectStore objects_;
};
// Use 47 at most, to be safe, since jsval privates are encoded as doubles.
static const uint64_t MAX_CPOW_IDS = (uint64_t(1) << 47) - 1;
} // namespace jsipc
} // namespace mozilla
#endif