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-rw-r--r--js/src/gc/Heap.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/js/src/gc/Heap.h b/js/src/gc/Heap.h
index 697803380..7f2c5fb4f 100644
--- a/js/src/gc/Heap.h
+++ b/js/src/gc/Heap.h
@@ -29,6 +29,7 @@
#include "js/HeapAPI.h"
#include "js/RootingAPI.h"
#include "js/TracingAPI.h"
+#include "js/TraceKind.h"
struct JSRuntime;
@@ -273,6 +274,23 @@ struct Cell
static MOZ_ALWAYS_INLINE bool needWriteBarrierPre(JS::Zone* zone);
+ template <class T>
+ inline bool is() const {
+ return getTraceKind() == JS::MapTypeToTraceKind<T>::kind;
+ }
+
+ template<class T>
+ inline T* as() {
+ MOZ_ASSERT(is<T>());
+ return static_cast<T*>(this);
+ }
+
+ template <class T>
+ inline const T* as() const {
+ MOZ_ASSERT(is<T>());
+ return static_cast<const T*>(this);
+ }
+
#ifdef DEBUG
inline bool isAligned() const;
void dump(FILE* fp) const;