X-Git-Url: http://git.megacz.com/?p=org.ibex.classgen.git;a=blobdiff_plain;f=src%2Forg%2Fibex%2Fclassgen%2FJSSA.java;h=c16f5e607c4122b5f9f3dd8617762ccb3f18fe05;hp=92d31f0b610c3c33d9c11855fe0bf4c8e3d7f163;hb=e2cfb2a90a85bcb7a8f6a6a6a6a8c9e0a3d1d371;hpb=af3a0876a2d5984da9997331710af0b4b4db7c49

diff --git a/src/org/ibex/classgen/JSSA.java b/src/org/ibex/classgen/JSSA.java
index 92d31f0..c16f5e6 100644
--- a/src/org/ibex/classgen/JSSA.java
+++ b/src/org/ibex/classgen/JSSA.java
@@ -73,8 +73,14 @@ public class JSSA extends MethodGen implements CGConst {
     /** JVM stack pointer */
     private int sp = 0;
     
-    private Expr push(Expr e) { return stack[sp++] = e; }
-    private Expr pop()        { return stack[--sp]; }
+    private Expr push(Expr e) {
+        if(sp == stack.length-1) throw new IllegalStateException("stack overflow");
+        return stack[sp++] = e;
+    }
+    private Expr pop() {
+        if(sp == 0) throw new IllegalStateException("stack underflow");
+        return stack[--sp];
+    }
 
 
     // SSA-node classes /////////////////////////////////////////////////////////////////////////////////////////