ES6: Implement WeakSet

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index 19524e21d23f2f5ee06ebac044deee41f3a36e4f..387894f93ace56a7b4ad1414ef282ed98f842360 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -183,6 +183,9 @@ void HeapObject::HeapObjectPrint(FILE* out) {
     case JS_WEAK_MAP_TYPE:
       JSWeakMap::cast(this)->JSWeakMapPrint(out);
       break;
+    case JS_WEAK_SET_TYPE:
+      JSWeakSet::cast(this)->JSWeakSetPrint(out);
+      break;
     case FOREIGN_TYPE:
       Foreign::cast(this)->ForeignPrint(out);
       break;
@@ -559,6 +562,7 @@ static const char* TypeToString(InstanceType type) {
     case JS_ARRAY_TYPE: return "JS_ARRAY";
     case JS_PROXY_TYPE: return "JS_PROXY";
     case JS_WEAK_MAP_TYPE: return "JS_WEAK_MAP";
+    case JS_WEAK_SET_TYPE: return "JS_WEAK_SET";
     case JS_REGEXP_TYPE: return "JS_REGEXP";
     case JS_VALUE_TYPE: return "JS_VALUE";
     case JS_GLOBAL_OBJECT_TYPE: return "JS_GLOBAL_OBJECT";
@@ -824,6 +828,15 @@ void JSWeakMap::JSWeakMapPrint(FILE* out) {
 }
 
 
+void JSWeakMap::JSWeakSetPrint(FILE* out) {
+  HeapObject::PrintHeader(out, "JSWeakSet");
+  PrintF(out, " - map = 0x%p\n", reinterpret_cast<void*>(map()));
+  PrintF(out, " - table = ");
+  table()->ShortPrint(out);
+  PrintF(out, "\n");
+}
+
+
 void JSArrayBuffer::JSArrayBufferPrint(FILE* out) {
   HeapObject::PrintHeader(out, "JSArrayBuffer");
   PrintF(out, " - map = 0x%p\n", reinterpret_cast<void*>(map()));