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   CMP_OR,
  18   CMP_AND,
  19   CMP_NOT,
  20   LOAD_VAR,
  21   LOAD_INT,
  22   LOAD_OFF,
  23   STORE,
  24   JMP_FALSE,
  25   GOTO,
  26   WRITE_INT,
  27   PUSH_INT,
  28   PUSH_VAR,
  29   CALL,
  30   RET,
  31   SHIFT
  32 };
  33
  34 /* For use by the virtual machine mainly */
  35 struct ops {
  36   char *opname;
  37   void (*op)(int arg);
  38 };
  39
  40 typedef struct code {
  41   int op;
  42   int arg;
  43 } code_t;
  44
  45 /* defined in code.c */
  46 extern struct ops ops[];
  47 extern int code_offset;
  48 extern code_t code[];
  49
  50 int reserve_loc(void);
  51 int gen_label(void);
  52 void gen_code(int op, int arg);
  53 void back_patch(int addr, int op, int arg);
  54 void print_code(char *output);
  55
  56 #endif  /* !__CODE_H__ */