michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sw=4 et tw=80:
michael@0:  *
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef mozilla_jsipc_JavaScriptShared_h__
michael@0: #define mozilla_jsipc_JavaScriptShared_h__
michael@0: 
michael@0: #include "mozilla/dom/DOMTypes.h"
michael@0: #include "mozilla/jsipc/PJavaScript.h"
michael@0: #include "nsJSUtils.h"
michael@0: #include "nsFrameMessageManager.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace jsipc {
michael@0: 
michael@0: typedef uint64_t ObjectId;
michael@0: 
michael@0: class JavaScriptShared;
michael@0: 
michael@0: class CpowIdHolder : public CpowHolder
michael@0: {
michael@0:   public:
michael@0:     CpowIdHolder(JavaScriptShared *js, const InfallibleTArray<CpowEntry> &cpows)
michael@0:       : js_(js),
michael@0:         cpows_(cpows)
michael@0:     {
michael@0:     }
michael@0: 
michael@0:     bool ToObject(JSContext *cx, JS::MutableHandleObject objp);
michael@0: 
michael@0:   private:
michael@0:     JavaScriptShared *js_;
michael@0:     const InfallibleTArray<CpowEntry> &cpows_;
michael@0: };
michael@0: 
michael@0: // Map ids -> JSObjects
michael@0: class ObjectStore
michael@0: {
michael@0:     typedef js::DefaultHasher<ObjectId> TableKeyHasher;
michael@0: 
michael@0:     typedef js::HashMap<ObjectId, JS::Heap<JSObject *>, TableKeyHasher, js::SystemAllocPolicy> ObjectTable;
michael@0: 
michael@0:   public:
michael@0:     ObjectStore();
michael@0: 
michael@0:     bool init();
michael@0:     void trace(JSTracer *trc);
michael@0: 
michael@0:     bool add(ObjectId id, JSObject *obj);
michael@0:     JSObject *find(ObjectId id);
michael@0:     void remove(ObjectId id);
michael@0: 
michael@0:   private:
michael@0:     ObjectTable table_;
michael@0: };
michael@0: 
michael@0: // Map JSObjects -> ids
michael@0: class ObjectIdCache
michael@0: {
michael@0:     typedef js::PointerHasher<JSObject *, 3> Hasher;
michael@0:     typedef js::HashMap<JSObject *, ObjectId, Hasher, js::SystemAllocPolicy> ObjectIdTable;
michael@0: 
michael@0:   public:
michael@0:     ObjectIdCache();
michael@0:     ~ObjectIdCache();
michael@0: 
michael@0:     bool init();
michael@0:     void trace(JSTracer *trc);
michael@0: 
michael@0:     bool add(JSContext *cx, JSObject *obj, ObjectId id);
michael@0:     ObjectId find(JSObject *obj);
michael@0:     void remove(JSObject *obj);
michael@0: 
michael@0:   private:
michael@0:     static void keyMarkCallback(JSTracer *trc, JSObject *key, void *data);
michael@0: 
michael@0:     ObjectIdTable *table_;
michael@0: };
michael@0: 
michael@0: class JavaScriptShared
michael@0: {
michael@0:   public:
michael@0:     bool init();
michael@0: 
michael@0:     static const uint32_t OBJECT_EXTRA_BITS  = 1;
michael@0:     static const uint32_t OBJECT_IS_CALLABLE = (1 << 0);
michael@0: 
michael@0:     bool Unwrap(JSContext *cx, const InfallibleTArray<CpowEntry> &aCpows, JS::MutableHandleObject objp);
michael@0:     bool Wrap(JSContext *cx, JS::HandleObject aObj, InfallibleTArray<CpowEntry> *outCpows);
michael@0: 
michael@0:   protected:
michael@0:     bool toVariant(JSContext *cx, JS::HandleValue from, JSVariant *to);
michael@0:     bool toValue(JSContext *cx, const JSVariant &from, JS::MutableHandleValue to);
michael@0:     bool fromDescriptor(JSContext *cx, JS::Handle<JSPropertyDescriptor> desc, PPropertyDescriptor *out);
michael@0:     bool toDescriptor(JSContext *cx, const PPropertyDescriptor &in,
michael@0:                       JS::MutableHandle<JSPropertyDescriptor> out);
michael@0:     bool convertIdToGeckoString(JSContext *cx, JS::HandleId id, nsString *to);
michael@0:     bool convertGeckoStringToId(JSContext *cx, const nsString &from, JS::MutableHandleId id);
michael@0: 
michael@0:     bool toValue(JSContext *cx, const JSVariant &from, jsval *to) {
michael@0:         JS::RootedValue v(cx);
michael@0:         if (!toValue(cx, from, &v))
michael@0:             return false;
michael@0:         *to = v;
michael@0:         return true;
michael@0:     }
michael@0: 
michael@0:     virtual bool makeId(JSContext *cx, JSObject *obj, ObjectId *idp) = 0;
michael@0:     virtual JSObject *unwrap(JSContext *cx, ObjectId id) = 0;
michael@0: 
michael@0:     bool unwrap(JSContext *cx, ObjectId id, JS::MutableHandle<JSObject*> objp) {
michael@0:         if (!id) {
michael@0:             objp.set(nullptr);
michael@0:             return true;
michael@0:         }
michael@0: 
michael@0:         objp.set(unwrap(cx, id));
michael@0:         return bool(objp.get());
michael@0:     }
michael@0: 
michael@0:     static void ConvertID(const nsID &from, JSIID *to);
michael@0:     static void ConvertID(const JSIID &from, nsID *to);
michael@0: 
michael@0:     JSObject *findObject(uint32_t objId) {
michael@0:         return objects_.find(objId);
michael@0:     }
michael@0: 
michael@0:   protected:
michael@0:     ObjectStore objects_;
michael@0: };
michael@0: 
michael@0: // Use 47 at most, to be safe, since jsval privates are encoded as doubles.
michael@0: static const uint64_t MAX_CPOW_IDS = (uint64_t(1) << 47) - 1;
michael@0: 
michael@0: } // namespace jsipc
michael@0: } // namespace mozilla
michael@0: 
michael@0: #endif