From: nobu.nokada@...
Date: 2004-10-27T09:47:54+09:00
Subject: Re: Errors in line numbers reported?

Hi,

At Wed, 27 Oct 2004 01:58:51 +0900,
Markus wrote in [ruby-talk:117790]:
>       This seems to be along the lines I was thinking, but there seems
> to be more to it than I was imagining, and I do not understand all of
> it.  Why is the interaction with the GC needed?  Wouldn't it be enough
> to allocate them and keep them around forever?

Do you mean:

  typedef struct {
  #ifdef NODE_SEGMENTED_LINENO
      unsigned char lineno_upper;
  #endif
      char gcmark, name[1];
  } srcfilename;

and

    ptr = ALLOC_N(char, len + offsetof(srcfile, name));
    ...
    srcfilename *ptr = (srcfilename *)(f - offsetof(srcfile, name));
?

Just because I didn't prefer reverting a member to the struct
containing it, there is no definite reason.

>      I was thinking it could be done by patching node.h (to add and
> adjust macros), eval.c (to use them), and parse.y, to make a small
> struct with int line_number_offset and char *file_name to store in the
> RNODEs in place of nd_file.  The main complexity would be making a new
> current struct any time a RNODE was created and 
> 
>         ruby_sourceline - current->line_number_offset >= 8*1024
> 
>      Is there a reason that I am not seeing why this would not work?

To save memory space.

-- 
Nobu Nakada