# HG changeset patch
# User cfang
# Date 1246576699 25200
# Node ID f1471947cdf89bad73b87de94ad6e7bfcd6e40fd
# Parent  11ba3d09bd0eca0905652ca9f4d9a2659e7c6b36
6855164: SIGSEGV during compilation of method involving loop over CharSequence.
Summary: Don not split a block if it contains a FastLockNode with a PhiNode input.
Reviewed-by: kvn, never

diff -r 11ba3d09bd0e -r f1471947cdf8 hotspot/src/share/vm/opto/loopopts.cpp
--- a/hotspot/src/share/vm/opto/loopopts.cpp	Wed Jul 01 20:22:18 2009 -0700
+++ b/hotspot/src/share/vm/opto/loopopts.cpp	Thu Jul 02 16:18:19 2009 -0700
@@ -667,7 +667,6 @@
   }
 }
 
-#ifdef _LP64
 static bool merge_point_safe(Node* region) {
   // 4799512: Stop split_if_with_blocks from splitting a block with a ConvI2LNode
   // having a PhiNode input. This sidesteps the dangerous case where the split
@@ -676,20 +675,25 @@
   // uses.
   // A better fix for this problem can be found in the BugTraq entry, but
   // expediency for Mantis demands this hack.
+  // 6855164: If the merge point has a FastLockNode with a PhiNode input, we stop
+  // split_if_with_blocks from splitting a block because we could not move around
+  // the FastLockNode.
   for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) {
     Node* n = region->fast_out(i);
     if (n->is_Phi()) {
       for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) {
         Node* m = n->fast_out(j);
-        if (m->Opcode() == Op_ConvI2L) {
+        if (m->is_FastLock())
           return false;
-        }
+#ifdef _LP64
+        if (m->Opcode() == Op_ConvI2L)
+          return false;
+#endif
       }
     }
   }
   return true;
 }
-#endif
 
 
 //------------------------------place_near_use---------------------------------
@@ -771,12 +775,10 @@
       if( get_loop(n_ctrl->in(j)) != n_loop )
         return;
 
-#ifdef _LP64
     // Check for safety of the merge point.
     if( !merge_point_safe(n_ctrl) ) {
       return;
     }
-#endif
 
     // Split compare 'n' through the merge point if it is profitable
     Node *phi = split_thru_phi( n, n_ctrl, policy );