exception handling related changes: * changed blockPredecessors to list of Instructions, instead of Blocks * removed explicit predecessor management in BlockBegin, now using predecessors from Graph structure * replaced generated LIR exception entries with exception dispatch chains in IR * added Unwind and ExceptionDispatch instructions * removed ExceptionEntry flag in BlockBegin and all code depending on it * removed exceptionHandler list from Instruction, replaced by exception Edge on Invoke and Throw * replaced list of ExceptionHandlers with single exception edge in debug info misc: * changed GraphvizPrinter layout (smaller ports on large nodes) * removed defunct run config

--- a/graal/GraalCompiler/src/com/sun/c1x/lir/LIRInstruction.java	Fri May 13 17:09:20 2011 -0700
+++ b/graal/GraalCompiler/src/com/sun/c1x/lir/LIRInstruction.java	Wed May 18 18:09:20 2011 +0200
@@ -483,12 +483,8 @@
         }
     }
 
-    public final List<ExceptionHandler> exceptionEdges() {
-        if (info != null && info.exceptionHandlers != null) {
-            return info.exceptionHandlers;
-        }
-
-        return Collections.emptyList();
+    public final BlockBegin exceptionEdge() {
+        return info.exceptionEdge;
     }
 
     @Override