Mercurial > hg > graal-compiler
diff agent/src/share/classes/sun/jvm/hotspot/memory/Universe.java @ 642:660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
author | kvn |
---|---|
date | Thu, 12 Mar 2009 10:37:46 -0700 |
parents | d1605aabd0a1 |
children | bd02caa94611 |
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--- a/agent/src/share/classes/sun/jvm/hotspot/memory/Universe.java Wed Mar 11 14:16:13 2009 -0700 +++ b/agent/src/share/classes/sun/jvm/hotspot/memory/Universe.java Thu Mar 12 10:37:46 2009 -0700 @@ -53,7 +53,8 @@ // system obj array klass object private static sun.jvm.hotspot.types.OopField systemObjArrayKlassObjField; - private static AddressField heapBaseField; + private static AddressField narrowOopBaseField; + private static CIntegerField narrowOopShiftField; static { VM.registerVMInitializedObserver(new Observer() { @@ -86,7 +87,8 @@ systemObjArrayKlassObjField = type.getOopField("_systemObjArrayKlassObj"); - heapBaseField = type.getAddressField("_heap_base"); + narrowOopBaseField = type.getAddressField("_narrow_oop._base"); + narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift"); } public Universe() { @@ -100,14 +102,18 @@ } } - public static long getHeapBase() { - if (heapBaseField.getValue() == null) { + public static long getNarrowOopBase() { + if (narrowOopBaseField.getValue() == null) { return 0; } else { - return heapBaseField.getValue().minus(null); + return narrowOopBaseField.getValue().minus(null); } } + public static int getNarrowOopShift() { + return (int)narrowOopShiftField.getValue(); + } + /** Returns "TRUE" iff "p" points into the allocated area of the heap. */ public boolean isIn(Address p) { return heap().isIn(p);