Add more code

Add some funcitons to work with variables, add more instructions and add
ability to stop the code from `ccl_instruction`

1 files changed, 4 insertions, 1 deletions

diff --git a/src/instruction/decrement.c b/src/instruction/decrement.c
index f7f54dd..ce3af87 100644
--- a/src/instruction/decrement.c
+++ b/src/instruction/decrement.c
@@ -1,8 +1,11 @@
 #include "3cl.h"
-#include "instruction.h"
+
+#include "utils.h"
 
 struct CCLFrame *ccl_instruction_decrement(struct CCL *ccl, struct CCLFrame *frame)
 {
+    if (ccl->stack.cur < 1)
+        die(1, "stack size is %d (%d required)", ccl->stack.cur, 1);
     --ccl->stack.stack[ccl->stack.cur];
     return frame;
 }