From: brian <brian@brianweb.net>
Date: Sun, 3 Jul 2005 20:35:55 +0000 (+0000)
Subject: stack overflow checking
X-Git-Url: http://git.megacz.com/?p=org.ibex.classgen.git;a=commitdiff_plain;h=e2cfb2a90a85bcb7a8f6a6a6a6a8c9e0a3d1d371;hp=af3a0876a2d5984da9997331710af0b4b4db7c49

stack overflow checking

darcs-hash:20050703203555-24bed-6830336c6205eb9ab4208f81e216f34099de3424.gz
---

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 /////////////////////////////////////////////////////////////////////////////////////////