Changes for try/catch handling

1999-04-16 02:54:56 +00:00
parent 4d9b383818
commit 500afc1787
5 changed files with 120 additions and 10 deletions
@@ -2,12 +2,33 @@
 import java.util.Stack;

 class JSStack {
-
+    
    Stack stack = new Stack();
-
-    void push(StackValue value)
+    int frameTop;
+    
+    void newFrame(StackValue returnAddress)
    {
-        stack.push(value);
+        stack.push(returnAddress);
+        stack.push(new StackValue(frameTop));
+        frameTop = stack.size();
+    }
+    
+    StackValue popFrame()
+    {
+        stack.setSize(frameTop);
+        StackValue oldFrame = (StackValue)(stack.pop());
+        frameTop = oldFrame.i;
+        return (StackValue)stack.pop();
+    }
+    
+    void push(StackValue v)
+    {
+        stack.push(v);
+    }
+    
+    boolean isEmpty()
+    {
+        return stack.isEmpty();
    }

    StackValue pop()