Function previousinstruction

3rd/lua-5.4.3/src/lcode.c:115–121

** Return the previous instruction of the current code. If there ** may be a jump target between the current instruction and the ** previous one, return an invalid instruction (to avoid wrong ** optimizations). */

** optimizations).
*/
static Instruction *previousinstruction (FuncState *fs) {
  static const Instruction invalidinstruction = ~(Instruction)0;
  if (fs->pc > fs->lasttarget)
    return &fs->f->code[fs->pc - 1];  /* previous instruction */
  else
    return cast(Instruction*, &invalidinstruction);
}


/*