Bug 1119753 - Fix CPOW GC crash (r=jonco)

js/ipc/JavaScriptShared.cpp

@@ -73,6 +73,18 @@ IdToObjectMap::remove(ObjectId id)
     table_.remove(id);
 }
 
+void
+IdToObjectMap::clear()
+{
+    table_.clear();
+}
+
+bool
+IdToObjectMap::empty() const
+{
+    return table_.empty();
+}
+
 ObjectToIdMap::ObjectToIdMap()
   : table_(nullptr)
 {
@@ -157,6 +169,12 @@ ObjectToIdMap::remove(JSObject *obj)
     table_->remove(obj);
 }
 
+void
+ObjectToIdMap::clear()
+{
+    table_->clear();
+}
+
 bool JavaScriptShared::sLoggingInitialized;
 bool JavaScriptShared::sLoggingEnabled;
 bool JavaScriptShared::sStackLoggingEnabled;
@@ -181,6 +199,11 @@ JavaScriptShared::JavaScriptShared(JSRuntime *rt)
     }
 }
 
+JavaScriptShared::~JavaScriptShared()
+{
+    MOZ_RELEASE_ASSERT(cpows_.empty());
+}
+
 bool
 JavaScriptShared::init()
 {