[ruby-dev:27846] parser_params heap

struct parser_params の heap ですが、Ripper のときとそうでな
いときでオフセットがずれるにも関わらず、rb_parser_malloc な
どで Ripper でないときのオフセットを仮定して heap に書き込ん
でいるようなのですが、これはどうしたもんでしょう?

% cat z.rb
require 'ripper.so'

class Ripper
  def on_CHAR(token)
  end
end

Ripper.new('@').parse

% gdb ruby
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This GDB was configured as "i386-linux"...Using host libthread_db library "/lib/libthread_db.so.1".

(gdb) break ripper_yyparse
Function "ripper_yyparse" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (ripper_yyparse) pending.
(gdb) run z.rb
Starting program: /tmp/c/ruby/ruby z.rb
Breakpoint 2 at 0x401d1fef: file ripper.c, line 4410.
Pending breakpoint "ripper_yyparse" resolved

Breakpoint 2, ripper_yyparse (parser_v=0x8168a98) at ripper.c:4410
4410      int yytoken = 0;
(gdb) up
#1  0x401deaaa in ripper_parse0 (parser_v=1075552908) at ripper.y:9157
9157        ripper_yyparse((void*)parser);
(gdb) p parser
$1 = (struct parser_params *) 0x8168a98
(gdb) p *parser
$2 = {parser_yylval = 0x0, eofp = 0, parser_lex_strterm = 0x0, parser_lex_state = EXPR_BEG, parser_cond_stack = 0, 
  parser_cmdarg_stack = 0, parser_class_nest = 0, parser_paren_nest = 0, parser_lpar_beg = 0, parser_in_single = 0, 
  parser_in_def = 0, parser_compile_for_eval = 0, parser_cur_mid = 0, parser_in_defined = 0, parser_tokenbuf = 0x0, 
  parser_tokidx = 0, parser_toksiz = 0, parser_lex_input = 1075552988, parser_lex_lastline = 1075552868, 
  parser_lex_pbeg = 0x8168b58 "@", parser_lex_p = 0x8168b58 "@", parser_lex_pend = 0x8168b59 "", parser_heredoc_end = 0, 
  parser_command_start = 2, parser_lex_gets_ptr = 1, parser_lex_gets = 0x401d843a <lex_get_str>, parser_lvtbl = 0x0, 
  parser_ruby__end__seen = 0, parser_ruby_sourceline = 1, parser_ruby_sourcefile = 1075552888, tokp = 0x8168b58 "@", 
  delayed = 4, delayed_line = 0, delayed_col = 0, value = 1075552908, result = 4, parsing_thread = 1075607068, 
  toplevel_p = 2, line_count = 1, has_shebang = 0, heap = 0x0}
(gdb) p parser->heap
$3 = (NODE *) 0x0
(gdb) p &parser->heap
$4 = (NODE **) 0x8168b40
(gdb) down
#0  ripper_yyparse (parser_v=0x8168a98) at ripper.c:4410
4410      int yytoken = 0;
(gdb) break rb_parser_malloc
Breakpoint 3 at 0x80a56ea: file parse.y, line 8771.
(gdb) c
Continuing.

Breakpoint 3, rb_parser_malloc (parserp=0x8168a98, size=37) at parse.y:8771
8771        NODE *n = NEWHEAP(HEAPCNT(1, size));
(gdb) p parserp
$5 = (struct parser_params *) 0x8168a98
(gdb) p *parserp
$6 = {parser_yylval = 0xbfe52bd8, eofp = 2, parser_lex_strterm = 0x0, parser_lex_state = EXPR_BEG, parser_cond_stack = 0, 
  parser_cmdarg_stack = 0, parser_class_nest = 0, parser_paren_nest = 0, parser_lpar_beg = 0, parser_in_single = 0, 
  parser_in_def = 0, parser_compile_for_eval = 0, parser_cur_mid = 0, parser_in_defined = 0, 
  parser_tokenbuf = 0x8168b68 "@", parser_tokidx = 1, parser_toksiz = 60, parser_lex_input = 1075552988, 
  parser_lex_lastline = 1075552868, parser_lex_pbeg = 0x8168b58 "@", parser_lex_p = 0x8168b59 "", 
  parser_lex_pend = 0x8168b59 "", parser_heredoc_end = 0, parser_command_start = 0, parser_lex_gets_ptr = 1, 
  parser_lex_gets = 0x401d843a <lex_get_str>, parser_lvtbl = 0x0, parser_ruby__end__seen = 0, parser_eval_tree_begin = 0x1, 
  parser_eval_tree = 0x401ba278, debug_lines = 135695193, line_count = 4, has_shebang = 0, heap = 0x0}
(gdb) p parserp->heap
$7 = (NODE *) 0x0
(gdb) p &parserp->heap
$8 = (NODE **) 0x8168b24
(gdb) n
8773        return ADD2HEAP(n, xmalloc(size));
(gdb) 
8774    }
(gdb) p *(NODE **) 0x8168b24
$9 = (struct RNode *) 0x401ba23c
(gdb) p *(NODE **) 0x8168b40
$10 = (struct RNode *) 0x0
(gdb) 
% ./ruby -v
ruby 1.9.0 (2005-11-28) [i686-linux]
-- 
[田中 哲][たなか あきら][Tanaka Akira]