implemented CASE-OF

include/fh_config.h

@@ -32,5 +32,6 @@
 #define MAGICADDR_STATE            0xFFFF57a7ULL
 #define MAGICADDR_INPTR            0xFFFFF175ULL
 #define MAGICADDR_UNRESOLVED       0xFFFFFBADULL
+#define MAGICADDR_ENDCASE_UNRESOLVED 0xFFFC5BADULL
 
 #endif //FORTH_FH_CONFIG_H

include/fh_runtime.h

@@ -44,6 +44,13 @@ enum fh_instruction_kind {
   /* Jump if zero */
   FH_INSTR_JUMPZERO,
 
+  /* Jump if the two elements on stack do not equal, consuming the top one. 
+   * Otherwise consume both and continue. */
+  FH_INSTR_OF,
+
+  /* Endcase, pop the testval from DS */
+  FH_INSTR_ENDCASE,
+
   /* Loop exit */
   FH_INSTR_LEAVE,