Dynamically determine optimal instance size....

src/mark-compact.cc

Index: src/mark-compact.cc
===================================================================
--- src/mark-compact.cc	(revision 5500)
+++ src/mark-compact.cc	(working copy)
@@ -282,10 +282,7 @@
                                          FixedArray::BodyDescriptor,
                                          void>::Visit);
 
-    table_.Register(kVisitSharedFunctionInfo,
-                    &FixedBodyVisitor<StaticMarkingVisitor,
-                                      SharedFunctionInfo::BodyDescriptor,
-                                      void>::Visit);
+    table_.Register(kVisitSharedFunctionInfo, &VisitSharedFunctionInfo);
 
     table_.Register(kVisitByteArray, &DataObjectVisitor::Visit);
     table_.Register(kVisitSeqAsciiString, &DataObjectVisitor::Visit);
@@ -537,6 +534,17 @@
   }
 
 
+  static void VisitSharedFunctionInfo(Map* map, HeapObject* object) {
+    SharedFunctionInfo* shared = reinterpret_cast<SharedFunctionInfo*>(object);
+    if (shared->IsInobjectSlackTrackingInProgress()) {
+      shared->DetachInitialMap();
+    }
+    FixedBodyVisitor<StaticMarkingVisitor,
+                     SharedFunctionInfo::BodyDescriptor,
+                     void>::Visit(map, object);
+  }
+
+
   static void VisitCodeEntry(Address entry_address) {
     Object* code = Code::GetObjectFromEntryAddress(entry_address);
     Object* old_code = code;
@@ -1139,6 +1147,12 @@
     // 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;
+
+    if (map->IsMarked() && map->attached_to_shared_function_info()) {

[Vitaly Repeshko, 2010/09/22 14:40:25]

This needs a short comment.

[Vladislav Kaznacheev, 2010/09/23 08:38:16]

Done.

+      map->unchecked_constructor()->unchecked_shared()->
+          AttachInitialMap(map);
+    }
+
     // Follow the chain of back pointers to find the prototype.
     Map* current = map;
     while (SafeIsMap(current)) {