Function savelineinfo

3rd/lua-5.4.3/src/lcode.c:328–343

** Save line info for a new instruction. If difference from last line ** does not fit in a byte, of after that many instructions, save a new ** absolute line info; (in that case, the special value 'ABSLINEINFO' ** in 'lineinfo' signals the existence of this absolute information.) ** Otherwise, store the difference from last line in 'lineinfo'. */

** Otherwise, store the difference from last line in 'lineinfo'.
*/
static void savelineinfo (FuncState *fs, Proto *f, int line) {
  int linedif = line - fs->previousline;
  int pc = fs->pc - 1;  /* last instruction coded */
  if (abs(linedif) >= LIMLINEDIFF || fs->iwthabs++ >= MAXIWTHABS) {
    luaM_growvector(fs->ls->L, f->abslineinfo, fs->nabslineinfo,
                    f->sizeabslineinfo, AbsLineInfo, MAX_INT, "lines");
    f->abslineinfo[fs->nabslineinfo].pc = pc;
    f->abslineinfo[fs->nabslineinfo++].line = line;
    linedif = ABSLINEINFO;  /* signal that there is absolute information */
    fs->iwthabs = 1;  /* restart counter */
  }
  luaM_growvector(fs->ls->L, f->lineinfo, pc, f->sizelineinfo, ls_byte,
                  MAX_INT, "opcodes");
  f->lineinfo[pc] = linedif;
  fs->previousline = line;  /* last line saved */
}


/*