Bug 1017302 - Expose add-on IDs to JS engine (r=bholley)

js/public/TypeDecls.h

@@ -27,6 +27,7 @@ class JSFunction;
 class JSObject;
 class JSScript;
 class JSString;
+class JSAddonId;
 
 struct jsid;
 

js/src/jsapi.cpp

@@ -1007,6 +1007,24 @@ JS_GetCompartmentPrivate(JSCompartment *compartment)
     return compartment->data;
 }
 
+JS_PUBLIC_API(JSAddonId *)
+JS::NewAddonId(JSContext *cx, HandleString str)
+{
+    return static_cast<JSAddonId *>(JS_InternJSString(cx, str));
+}
+
+JS_PUBLIC_API(const jschar *)
+JS::CharsZOfAddonId(JSAddonId *id)
+{
+    return id->charsZ();
+}
+
+JS_PUBLIC_API(JSString *)
+JS::StringOfAddonId(JSAddonId *id)
+{
+    return id;
+}
+
 JS_PUBLIC_API(void)
 JS_SetZoneUserData(JS::Zone *zone, void *data)
 {

js/src/jsapi.h

@@ -4324,6 +4324,19 @@ class JSAutoByteString
     JSAutoByteString &operator=(const JSAutoByteString &another);
 };
 
+namespace JS {
+
+extern JS_PUBLIC_API(JSAddonId *)
+NewAddonId(JSContext *cx, JS::HandleString str);
+
+extern JS_PUBLIC_API(const jschar *)
+CharsZOfAddonId(JSAddonId *id);
+
+extern JS_PUBLIC_API(JSString *)
+StringOfAddonId(JSAddonId *id);
+
+} // namespace JS
+
 /************************************************************************/
 /*
  * JSON functions

js/src/vm/String.h

@@ -1278,6 +1278,11 @@ CopyChars(CharT *dest, const JSLinearString &str);
 
 } /* namespace js */
 
+// Addon IDs are interned atoms which are never destroyed. This detail is
+// not exposed outside the API.
+class JSAddonId : public JSAtom
+{};
+
 /* Avoid requiring vm/String-inl.h just to call getChars. */
 
 MOZ_ALWAYS_INLINE const jschar *