Function discharge2reg

third-party/lua-5.4.6/src/lcode.c:827–874

** Ensure expression value is in register 'reg', making 'e' a ** non-relocatable expression. ** (Expression still may have jump lists.) */

** (Expression still may have jump lists.)
*/
static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
  luaK_dischargevars(fs, e);
  switch (e->k) {
    case VNIL: {
      luaK_nil(fs, reg, 1);
      break;
    }
    case VFALSE: {
      luaK_codeABC(fs, OP_LOADFALSE, reg, 0, 0);
      break;
    }
    case VTRUE: {
      luaK_codeABC(fs, OP_LOADTRUE, reg, 0, 0);
      break;
    }
    case VKSTR: {
      str2K(fs, e);
    }  /* FALLTHROUGH */
    case VK: {
      luaK_codek(fs, reg, e->u.info);
      break;
    }
    case VKFLT: {
      luaK_float(fs, reg, e->u.nval);
      break;
    }
    case VKINT: {
      luaK_int(fs, reg, e->u.ival);
      break;
    }
    case VRELOC: {
      Instruction *pc = &getinstruction(fs, e);
      SETARG_A(*pc, reg);  /* instruction will put result in 'reg' */
      break;
    }
    case VNONRELOC: {
      if (reg != e->u.info)
        luaK_codeABC(fs, OP_MOVE, reg, e->u.info, 0);
      break;
    }
    default: {
      lua_assert(e->k == VJMP);
      return;  /* nothing to do... */
    }
  }
  e->u.info = reg;
  e->k = VNONRELOC;
}


/*