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changeset 9404:365ca8db15a0

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Add comments in safepoint detection of WriteBarrierVerification Phase
author Christos Kotselidis <christos.kotselidis@oracle.com>
date Sun, 28 Apr 2013 19:50:43 +0200
parents ca4d71edadcd
children 5618a717b8ad
files graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/phases/WriteBarrierVerificationPhase.java
diffstat 1 files changed, 5 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/phases/WriteBarrierVerificationPhase.java	Sun Apr 28 19:43:32 2013 +0200
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/phases/WriteBarrierVerificationPhase.java	Sun Apr 28 19:50:43 2013 +0200
@@ -99,6 +99,11 @@
     }
 
     private static boolean isSafepoint(Node node) {
+        /*
+         * LoopBegin nodes are also treated as safepoints since a bottom-up analysis is performed
+         * and loop safepoints are placed before LoopEnd nodes. Possible elimination of write
+         * barriers inside loops, derived from writes, outside the loops can not be permitted.
+         */
         return ((node instanceof DeoptimizingNode) && ((DeoptimizingNode) node).canDeoptimize()) || (node instanceof LoopBeginNode);
     }