code.h

   1 #ifndef __CODE_H__
   2 #define __CODE_H__
   3
   4 enum {
   5   HALT,
   6   ADD,
   7   SUB,
   8   MUL,
   9   DIV,
  10   MOD,
  11   CMP_EQL,
  12   CMP_NE,
  13   CMP_GEQL,
  14   CMP_LEQL,
  15   CMP_GT,
  16   CMP_LT,
  17   LOAD_VAR,
  18   LOAD_INT,
  19   LOAD_OFF,
  20   STORE,
  21   JMP_FALSE,
  22   GOTO,
  23   WRITE_INT,
  24   PUSH_INT,
  25   PUSH_VAR,
  26   CALL,
  27   RET,
  28   SHIFT
  29 };
  30
  31 /* For use by the virtual machine mainly */
  32 struct ops {
  33   char *opname;
  34   void (*op)(int arg);
  35 };
  36
  37 typedef struct code {
  38   int op;
  39   int arg;
  40 } code_t;
  41
  42 /* defined in code.c */
  43 extern struct ops ops[];
  44 extern int code_offset;
  45 extern code_t code[];
  46
  47 int reserve_loc(void);
  48 int gen_label(void);
  49 void gen_code(int op, int arg);
  50 void back_patch(int addr, int op, int arg);
  51 void print_code(char *output);
  52
  53 #endif  /* !__CODE_H__ */