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diff agent/src/share/classes/sun/jvm/hotspot/oops/Instance.java @ 113:ba764ed4b6f2

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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
author coleenp
date Sun, 13 Apr 2008 17:43:42 -0400
parents a61af66fc99e
children d1605aabd0a1
line wrap: on
line diff
--- a/agent/src/share/classes/sun/jvm/hotspot/oops/Instance.java	Fri Apr 11 09:56:35 2008 -0400
+++ b/agent/src/share/classes/sun/jvm/hotspot/oops/Instance.java	Sun Apr 13 17:43:42 2008 -0400
@@ -40,15 +40,26 @@
         }
       });
   }
+  private static long typeSize;
 
   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
     Type type = db.lookupType("instanceOopDesc");
+    typeSize = type.getSize();
   }
 
   Instance(OopHandle handle, ObjectHeap heap) {
     super(handle, heap);
   }
 
+  // Returns header size in bytes.
+  public static long getHeaderSize() {
+    if (VM.getVM().isCompressedOopsEnabled()) {
+      return typeSize - VM.getVM().getIntSize();
+    } else {
+      return typeSize;
+    }
+  }
+
   public boolean isInstance()          { return true; }
 
   public void iterateFields(OopVisitor visitor, boolean doVMFields) {