check for combineable operator

git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@182 379699f6-c40d-0410-875b-85095c16579e

jode/jode/flow/CombineIfGotoExpressions.java

@@ -44,7 +44,8 @@ public class CombineIfGotoExpressions {
                 return false;
 
             Expression expr = ib.getInstruction();
-            if (lastCombined.canCombine(expr) + e[1].canCombine(expr) <= 0)
+            if (!(expr.getOperator() instanceof CombineableOperator)
+		|| lastCombined.canCombine(expr) + e[1].canCombine(expr) <= 0)
                 /* Tricky, the above is true, iff one of the two
                  * Expressions conflict, or both fail.  */
                 return false;

jode/jode/flow/CreateExpression.java

@@ -72,11 +72,12 @@ public class CreateExpression {
             Expression expr =
                 ((InstructionBlock) sequBlock.subBlocks[0]).getInstruction();
             
-            
             if (!expr.isVoid()) {
                 if (--i == 0)
                     break;
             } else if (lastExpression == null
+		       || !(expr.getOperator() 
+			    instanceof CombineableOperator)
                        || lastExpression.canCombine(expr) <= 0)
                 return false;
 

jode/jode/flow/CreateForInitializer.java

@@ -41,6 +41,8 @@ public class CreateForInitializer {
         InstructionBlock init = (InstructionBlock) sequBlock.subBlocks[0];
             
         if (!init.getInstruction().isVoid()
+	    || !(init.getInstruction().getOperator() 
+		 instanceof CombineableOperator)
             || !forBlock.conditionMatches(init))
             return false;
 

jode/jode/flow/FlowBlock.java

@@ -21,6 +21,7 @@ package jode.flow;
 import java.util.*;
 import jode.*;
 import jode.decompiler.Expression;
+import jode.decompiler.CombineableOperator;
 
 /**
  * A flow block is the structure of which the flow graph consists.  A
@@ -783,8 +784,9 @@ public class FlowBlock {
             } 
 
             if (!createdForBlock 
-                && ((InstructionBlock)
-                    lastModified).getInstruction().isVoid()) {
+                && (((InstructionBlock)
+		     lastModified).getInstruction().getOperator()
+		    instanceof CombineableOperator)) {
 		
                 /* The only jump is the jump of the last
                  * instruction lastModified, there is a big