1 files changed, 16 insertions, 0 deletions
diff --git a/js/public/Value.h b/js/public/Value.h
index 59f71da4f1..98f0f9273b 100644
--- a/js/public/Value.h
+++ b/js/public/Value.h
@@ -383,6 +383,9 @@ enum JSWhyMagic {
   /** arguments object can't be created because environment is dead. */
   JS_MISSING_ARGUMENTS,
 
+  /** exception value thrown when interrupting irregexp */
+  JS_INTERRUPT_REGEXP,
+
   /** for local use */
   JS_GENERIC_MAGIC,
 
@@ -645,7 +648,20 @@ class alignas(8) Value {
   }
 #endif
 
+  void changeGCThingPayload(js::gc::Cell* cell) {
+    MOZ_ASSERT(js::gc::IsCellPointerValid(cell));
+#ifdef DEBUG
+    assertTraceKindMatches(cell);
+#endif
+    asBits_ = bitsFromTagAndPayload(toTag(), PayloadType(cell));
+    MOZ_ASSERT(toGCThing() == cell);
+  }
+
  private:
+#ifdef DEBUG
+  void assertTraceKindMatches(js::gc::Cell* cell) const;
+#endif
+
   void setObjectNoCheck(JSObject* obj) {
     asBits_ = bitsFromTagAndPayload(JSVAL_TAG_OBJECT, PayloadType(obj));
   }