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 };
  29
  30 /* For use by the virtual machine mainly */
  31 struct ops {
  32   char *opname;
  33   void (*op)(int arg);
  34 };
  35
  36 typedef struct code {
  37   int op;
  38   int arg;
  39 } code_t;
  40
  41 /* defined in code.c */
  42 extern struct ops ops[];
  43 extern int code_offset;
  44 extern code_t code[];
  45
  46 int reserve_loc(void);
  47 int gen_label(void);
  48 void gen_code(int op, int arg);
  49 void back_patch(int addr, int op, int arg);
  50 void print_code(char *output);
  51
  52 #endif  /* !__CODE_H__ */