Implement set trap for proxies, and revamp class hierarchy in preparation

src/mark-compact.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1045 matching lines @@
   ASSERT(HEAP->Contains(object));
   if (object->IsMap()) {
     Map* map = Map::cast(object);
     if (FLAG_cleanup_code_caches_at_gc) {
       map->ClearCodeCache(heap());
     }
     SetMark(map);
 
     // When map collection is enabled we have to mark through map's transitions
     // in a special way to make transition links weak.
-    // Only maps with instance types between FIRST_JS_OBJECT_TYPE and
-    // JS_FUNCTION_TYPE can have transitions.
-    if (FLAG_collect_maps &&
-        map->instance_type() >= FIRST_JS_OBJECT_TYPE &&
-        map->instance_type() <= JS_FUNCTION_TYPE) {
+    // Only maps for subclasses of JSReceiver can have transitions.
+    STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE);
+    if (FLAG_collect_maps && map->instance_type() >= FIRST_JS_RECEIVER_TYPE) {
       MarkMapContents(map);
     } else {
       marking_stack_.Push(map);
     }
   } else {
     SetMark(object);
     marking_stack_.Push(object);
   }
 }
 
@@ skipping 61 matching lines @@
   marking_stack_.Push(descriptors);
 }
 
 
 void MarkCompactCollector::CreateBackPointers() {
   HeapObjectIterator iterator(heap()->map_space());
   for (HeapObject* next_object = iterator.next();
        next_object != NULL; next_object = iterator.next()) {
     if (next_object->IsMap()) {  // Could also be ByteArray on free list.
       Map* map = Map::cast(next_object);
-      if (map->instance_type() >= FIRST_JS_OBJECT_TYPE &&
-          map->instance_type() <= JS_FUNCTION_TYPE) {
+      STATIC_ASSERT(LAST_TYPE == LAST_CALLABLE_SPEC_OBJECT_TYPE);
+      if (map->instance_type() >= FIRST_JS_RECEIVER_TYPE) {
         map->CreateBackPointers();
       } else {
         ASSERT(map->instance_descriptors() == heap()->empty_descriptor_array());
       }
     }
   }
 }
 
 
 static int OverflowObjectSize(HeapObject* obj) {
@@ skipping 355 matching lines @@
   // scan the descriptor arrays of those maps, not all maps.
   // All of these actions are carried out only on maps of JSObjects
   // and related subtypes.
   for (HeapObject* obj = map_iterator.next();
        obj != NULL; obj = map_iterator.next()) {
     Map* map = reinterpret_cast<Map*>(obj);
     if (!map->IsMarked() && map->IsByteArray()) continue;
 
     ASSERT(SafeIsMap(map));
     // Only JSObject and subtypes have map transitions and back pointers.
-    if (map->instance_type() < FIRST_JS_OBJECT_TYPE) continue;
-    if (map->instance_type() > JS_FUNCTION_TYPE) continue;
+    STATIC_ASSERT(LAST_TYPE == LAST_CALLABLE_SPEC_OBJECT_TYPE);
+    if (map->instance_type() < FIRST_JS_RECEIVER_TYPE) continue;
 
     if (map->IsMarked() && map->attached_to_shared_function_info()) {
       // This map is used for inobject slack tracking and has been detached
       // from SharedFunctionInfo during the mark phase.
       // Since it survived the GC, reattach it now.
       map->unchecked_constructor()->unchecked_shared()->AttachInitialMap(map);
     }
 
     // Clear dead prototype transitions.
     FixedArray* prototype_transitions = map->unchecked_prototype_transitions();
@@ skipping 1598 matching lines @@
 }
 
 
 void MarkCompactCollector::Initialize() {
   StaticPointersToNewGenUpdatingVisitor::Initialize();
   StaticMarkingVisitor::Initialize();
 }
 
 
 } }  // namespace v8::internal