Rewrite CPOWs to use one actor per process (bug 853209, r=billm,bholley,smaug).

js/ipc/JavaScriptShared.h

@@ -0,0 +1,119 @@
+/* -*- 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 "jsapi.h"
+#include "jspubtd.h"
+#include "js/HashTable.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;
+
+// Map ids -> JSObjects
+class ObjectStore
+{
+    typedef js::DefaultHasher<ObjectId> TableKeyHasher;
+
+    typedef js::HashMap<ObjectId, 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();
+
+    bool init();
+    void trace(JSTracer *trc);
+
+    bool add(JSObject *, ObjectId id);
+    ObjectId find(JSObject *obj);
+    void remove(JSObject *obj);
+
+  private:
+    ObjectIdTable table_;
+};
+
+class JavaScriptShared
+{
+  public:
+    bool init();
+
+    static const uint32_t OBJECT_EXTRA_BITS  = 1;
+    static const uint32_t OBJECT_IS_CALLABLE = (1 << 0);
+
+  protected:
+    bool toVariant(JSContext *cx, jsval from, JSVariant *to);
+    bool toValue(JSContext *cx, const JSVariant &from, JS::MutableHandleValue to);
+    bool fromDescriptor(JSContext *cx, const JSPropertyDescriptor &desc, PPropertyDescriptor *out);
+    bool toDescriptor(JSContext *cx, const PPropertyDescriptor &in, 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, JSObject **objp) {
+        if (!id) {
+            *objp = NULL;
+            return true;
+        }
+
+        *objp = unwrap(cx, id);
+        return !!*objp;
+    }
+
+    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