1 files changed, 5 insertions, 0 deletions
diff --git a/vmstk.h b/vmstk.h
index 4e81f5a0..30bb9009 100644
--- a/vmstk.h
+++ b/vmstk.h
@@ -22,9 +22,14 @@
 #ifndef INCLUDED_VMSTK_H
 #define INCLUDED_VMSTK_H
 
+/* The max size of the stack - TODO: make configurable */
+#define VMSTK_SIZE 256
+
 /* the vmstk object */
 typedef struct vmstk_s {
 	BEGINobjInstance;	/* Data to implement generic object - MUST be the first data element! */
+	var_t *vStk[VMSTK_SIZE];/* the actual stack */
+	int iStkPtr;		/* stack pointer, points to next free location, grows from 0 --> topend */
 } vmstk_t;