Re: Building the igc branch on MS-Windows

[Eli Zaretskii]

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: eller.helmut@gmail.com,  emacs-devel@gnu.org
> Date: Fri, 26 Apr 2024 12:56:29 +0200
> 
> I've meanwhile pushed something that handles the use of PVEC_OTHER in
> modules. Nothing done for the scroll_bar struct in w32. Caution: I
> remved the assert.

This still crashes while scrolling through xdisp.c, but with a
different backtrace.  I've noticed that it crashes after GC kicks in
and releases a large amount of memory (about 100MB).  Here's the
backtrace:

  Thread 1 received signal SIGSEGV, Segmentation fault.
  XCAR (c=0xab5ca1b) at lisp.h:751
  751       return lisp_h_XLP (o);
  (gdb) bt
  #0  XCAR (c=0xab5ca1b) at lisp.h:751
  #1  assoc_no_quit (key=<optimized out>, alist=0xab5ca1b) at fns.c:2032
  #2  0x00cbc12d in font_list_entities (f=0xaa1c478, spec=0xa84227d)
      at font.c:2795
  #3  0x00cbce93 in font_find_for_lface (f=<optimized out>, f@entry=0xaa1c478,
      attrs=<optimized out>, attrs@entry=0x743a2b0, spec=<optimized out>,
      spec@entry=0xa8421dd, c=<optimized out>, c@entry=-1) at font.c:3316
  #4  0x00cbe3c4 in font_load_for_lface (f=f@entry=0xaa1c478,
      attrs=attrs@entry=0x743a2b0, spec=spec@entry=0xa8421dd) at font.c:3396
  #5  0x00bedf2b in realize_gui_face (cache=0x13ca1f88, attrs=0x743a2b0)
      at xfaces.c:6216
  #6  realize_face (cache=cache@entry=0x13ca1f88, attrs=attrs@entry=0x743a2b0,
      former_face_id=former_face_id@entry=-1) at xfaces.c:6053
  #7  0x00befdb3 in lookup_face (f=f@entry=0xaa1c478, attr=attr@entry=0x743a2b0)
      at xfaces.c:4989
  #8  0x00bf2dcc in face_at_string_position (w=0xaa1c628,
      string=<optimized out>, string@entry=0x1a30b7d4, pos=pos@entry=1,
      bufpos=bufpos@entry=0, endptr=endptr@entry=0x743a37c,
      base_face_id=MODE_LINE_ACTIVE_FACE_ID, mouse_p=mouse_p@entry=false,
      attr_filter=attr_filter@entry=0) at xfaces.c:6930
  #9  0x00b59268 in display_string (string=string@entry=0x13cbb010 "xdisp.c",
      lisp_string=0xac546fc, face_string=face_string@entry=0x1a30b7d4,
      face_string_pos=face_string_pos@entry=1, start=start@entry=0,
      it=it@entry=0x743a690, field_width=field_width@entry=12,
      precision=precision@entry=-13, max_x=max_x@entry=0,
      multibyte=multibyte@entry=0) at xdisp.c:29116
  #10 0x00b5a299 in display_mode_element (it=it@entry=0x743a690,
      depth=<optimized out>, depth@entry=3, field_width=<optimized out>,
      precision=<optimized out>, precision@entry=-13, elt=<optimized out>,
      elt@entry=0x1a30b7d4, props=<optimized out>, props@entry=0x0,
      risky=<optimized out>, risky@entry=false) at xdisp.c:27788
  #11 0x00b5b5ff in display_mode_element (it=it@entry=0x743a690, depth=3,
      depth@entry=1, field_width=0, precision=precision@entry=-13,
      elt=<optimized out>, elt@entry=0x1903ec10, props=props@entry=0x0,
      risky=risky@entry=false) at xdisp.c:27965
  #12 0x00b5b5ff in display_mode_element (it=it@entry=0x743a690, depth=1,
      depth@entry=0, field_width=field_width@entry=0,
      precision=precision@entry=0, elt=<optimized out>, elt@entry=0x1a40e953,
      props=props@entry=0x0, risky=risky@entry=false) at xdisp.c:27965
  #13 0x00b5cba9 in display_mode_line (w=w@entry=0xaa1c628,
      face_id=MODE_LINE_ACTIVE_FACE_ID, format=0x1a40e953) at lisp.h:1178
  #14 0x00b5f695 in display_mode_lines (w=w@entry=0xaa1c628) at xdisp.c:27303
  #15 0x00b77df2 in redisplay_window (window=window@entry=0xaa1c62d,
      just_this_one_p=just_this_one_p@entry=true) at xdisp.c:20924
  #16 0x00b7cab8 in redisplay_window_1 (window=0xaa1c62d) at xdisp.c:18023
  #17 0x00c928bb in internal_condition_case_1 (
      bfun=bfun@entry=0xb7ca80 <redisplay_window_1>, arg=0xaa1c62d,
      handlers=0x1a4810b3, hfun=hfun@entry=0xb26297 <redisplay_window_error>)
      at eval.c:1568
  #18 0x00b6124e in redisplay_internal () at xdisp.c:17512
  #19 0x00b62463 in redisplay () at xdisp.c:16562
  #20 0x00c06088 in read_char (commandflag=<optimized out>, commandflag@entry=1,
      map=<optimized out>, map@entry=0x134a91a3, prev_event=<optimized out>,
      used_mouse_menu=<optimized out>, used_mouse_menu@entry=0x743f7fb,
      end_time=<optimized out>, end_time@entry=0x0) at keyboard.c:2678
  #21 0x00c096bd in read_key_sequence (keybuf=keybuf@entry=0x743f8d8,
      prompt=prompt@entry=0x0,
      dont_downcase_last=dont_downcase_last@entry=false,
      can_return_switch_frame=<optimized out>,
      can_return_switch_frame@entry=true, fix_current_buffer=<optimized out>,
      fix_current_buffer@entry=true, prevent_redisplay=<optimized out>,
      prevent_redisplay@entry=false, disable_text_conversion_p=false)
      at keyboard.c:10727
  #22 0x00c0b24b in command_loop_1 () at lisp.h:1178
  #23 0x00c9281d in internal_condition_case (
      bfun=bfun@entry=0xc0b090 <command_loop_1>, handlers=handlers@entry=0x48,
      hfun=hfun@entry=0xbfe3d6 <cmd_error>) at eval.c:1544
  #24 0x00bf46eb in command_loop_2 (handlers=0x48) at keyboard.c:1168
  #25 0x00c92737 in internal_catch (tag=tag@entry=0x8790,
      func=func@entry=0xbf46cb <command_loop_2>, arg=arg@entry=0x48)
      at eval.c:1224
  #26 0x00bf468b in command_loop () at lisp.h:1178
  #27 0x00bfdf91 in recursive_edit_1 () at keyboard.c:754
  #28 0x00bfe281 in Frecursive_edit () at keyboard.c:837
  #29 0x00e37bef in main (argc=<optimized out>, argv=<optimized out>)
      at emacs.c:2626
  (gdb) p c
  $1 = (Lisp_Object) 0xab5ca1b
  (gdb) source src/.gdbinit
  warning: d:\gnu\git\emacs\feature/../lwlib: No such file or directory
  SIGINT is used by the debugger.
  Are you sure you want to change it? (y or n) [answered Y; input not from 
terminal]
  Environment variable "DISPLAY" not defined.
  Environment variable "TERM" not defined.
  Breakpoint 1 at 0xbf4030: file emacs.c, line 442.
  (gdb) p c
  $2 = XIL(0xab5ca1b)
  (gdb) xtype
  Lisp_Cons
  (gdb) xcar
  Cannot access memory at address 0xab5ca18
  (gdb) p c
  $3 = XIL(0xab5ca1b)
  (gdb) xcdr
  Cannot access memory at address 0xab5ca1c
  (gdb)