Labels and control flow

src/interpreter.h

@@ -1,16 +1,19 @@
 #ifndef INTERPRETER_H
 #define INTERPRETER_H
+#define MAX_ID_LEN 64
 
 #include "types.h"
 #include "parser.h"
 #include "include/uthash.h"
 
 typedef enum GroundRuntimeError {
-    ARG_TYPE_MISMATCH, TOO_FEW_ARGS, TOO_MANY_ARGS, FIXME 
+    ARG_TYPE_MISMATCH, TOO_FEW_ARGS, TOO_MANY_ARGS, UNKNOWN_LABEL, FIXME 
 } GroundRuntimeError;
 
 typedef struct GroundLabel {
-    
+    char id[MAX_ID_LEN];
+    int lineNum;
+    UT_hash_handle hh;
 } GroundLabel;
 
 void interpretGroundProgram(GroundProgram* in);