1 # Copyright (C) 1992-1998, 2000-2012 Free Software Foundation, Inc.
3 # This file is part of GNU Emacs.
5 # GNU Emacs is free software; you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 3, or (at your option)
10 # GNU Emacs is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with GNU Emacs; see the file COPYING. If not, write to the
17 # Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 # Boston, MA 02110-1301, USA.
20 # Force loading of symbols, enough to give us VALBITS etc.
22 # With some compilers, we need this to give us struct Lisp_Symbol etc.:
23 set $dummy = Fmake_symbol + 8
25 # Find lwlib source files too.
27 #dir /gd/gnu/lesstif-0.89.9/lib/Xm
29 # Don't enter GDB when user types C-g to quit.
30 # This has one unfortunate effect: you can't type C-c
31 # at the GDB to stop Emacs, when using X.
32 # However, C-z works just as well in that case.
35 # Make it work like SIGINT normally does.
38 # Pass on user signals
39 handle SIGUSR1 noprint pass
40 handle SIGUSR2 noprint pass
42 # Don't pass SIGALRM to Emacs. This makes problems when
46 # Use $bugfix so that the value isn't a constant.
47 # Using a constant runs into GDB bugs sometimes.
49 if (CHECK_LISP_OBJECT_TYPE)
54 set $ptr = ($bugfix & VALMASK) | DATA_SEG_BITS
58 if (CHECK_LISP_OBJECT_TYPE)
63 set $int = $bugfix << (USE_LSB_TAG ? 0 : INTTYPEBITS) >> INTTYPEBITS
67 if (CHECK_LISP_OBJECT_TYPE)
72 set $type = (enum Lisp_Type) (USE_LSB_TAG ? $bugfix & (1 << GCTYPEBITS) - 1 : $bugfix >> VALBITS)
75 # Set up something to print out s-expressions.
76 # We save and restore print_output_debug_flag to prevent the w32 port
77 # from calling OutputDebugString, which causes GDB to display each
78 # character twice (yuk!).
83 Print the emacs s-expression which is $.
84 Works only when an inferior emacs is executing.
87 # Print out s-expressions
90 set $output_debug = print_output_debug_flag
91 set print_output_debug_flag = 0
92 call safe_debug_print ($tmp)
93 set print_output_debug_flag = $output_debug
96 Print the argument as an emacs s-expression
97 Works only when an inferior emacs is executing.
100 # Print value of lisp variable
103 set $output_debug = print_output_debug_flag
104 set print_output_debug_flag = 0
105 call safe_debug_print (find_symbol_value (intern ($tmp)))
106 set print_output_debug_flag = $output_debug
109 Print the value of the lisp variable given as argument.
110 Works only when an inferior emacs is executing.
113 # Print out current buffer point and boundaries
115 set $b = current_buffer
117 printf "BUF PT: %d", $b->pt
118 if ($b->pt != $b->pt_byte)
119 printf "[%d]", $b->pt_byte
121 printf " of 1..%d", $t->z
122 if ($t->z != $t->z_byte)
123 printf "[%d]", $t->z_byte
125 if ($b->begv != 1 || $b->zv != $t->z)
126 printf " NARROW=%d..%d", $b->begv, $b->zv
127 if ($b->begv != $b->begv_byte || $b->zv != $b->zv_byte)
128 printf " [%d..%d]", $b->begv_byte, $b->zv_byte
131 printf " GAP: %d", $t->gpt
132 if ($t->gpt != $t->gpt_byte)
133 printf "[%d]", $t->gpt_byte
135 printf " SZ=%d\n", $t->gap_size
138 Print current buffer's point and boundaries.
139 Prints values of point, beg, end, narrow, and gap for current buffer.
143 set $itmethod = $arg0
146 printf "GET_FROM_BUFFER"
149 printf "GET_FROM_DISPLAY_VECTOR"
152 printf "GET_FROM_STRING"
155 printf "GET_FROM_C_STRING"
158 printf "GET_FROM_IMAGE"
161 printf "GET_FROM_STRETCH"
163 if ($itmethod < 0 || $itmethod > 5)
168 Pretty print it->method given as first arg
171 # Print out iterator given as first arg
174 printf "cur=%d", $it->current.pos.charpos
175 if ($it->current.pos.charpos != $it->current.pos.bytepos)
176 printf "[%d]", $it->current.pos.bytepos
178 printf " pos=%d", $it->position.charpos
179 if ($it->position.charpos != $it->position.bytepos)
180 printf "[%d]", $it->position.bytepos
182 printf " start=%d", $it->start.pos.charpos
183 if ($it->start.pos.charpos != $it->start.pos.bytepos)
184 printf "[%d]", $it->start.pos.bytepos
186 printf " end=%d", $it->end_charpos
187 printf " stop=%d", $it->stop_charpos
188 printf " face=%d", $it->face_id
189 if ($it->multibyte_p)
192 if ($it->header_line_p)
195 if ($it->n_overlay_strings > 0)
196 printf " nov=%d", $it->n_overlay_strings
199 printf " sp=%d", $it->sp
203 if ($it->len == 1 && $it->c >= ' ' && it->c < 255)
204 printf " ch='%c'", $it->c
206 printf " ch=[%d,%d]", $it->c, $it->len
212 printf "IT_CHARACTER"
215 printf "IT_COMPOSITION"
227 printf "IT_TRUNCATION"
230 printf "IT_CONTINUATION"
232 if ($it->what < 0 || $it->what > 6)
236 if ($it->method != 0)
239 pitmethod $it->method
240 if ($it->method == 2)
242 printf "[%d]", $it->current.string_pos.charpos
244 if ($it->method == 4)
246 printf "[%d]", $it->image_id
251 printf "BIDI: base_stop=%d prev_stop=%d level=%d\n", $it->base_level_stop, $it->prev_stop, $it->bidi_it.resolved_level
253 if ($it->region_beg_charpos >= 0)
254 printf "reg=%d-%d ", $it->region_beg_charpos, $it->region_end_charpos
256 printf "vpos=%d hpos=%d", $it->vpos, $it->hpos,
257 printf " y=%d lvy=%d", $it->current_y, $it->last_visible_y
258 printf " x=%d vx=%d-%d", $it->current_x, $it->first_visible_x, $it->last_visible_x
259 printf " w=%d", $it->pixel_width
260 printf " a+d=%d+%d=%d", $it->ascent, $it->descent, $it->ascent+$it->descent
261 printf " max=%d+%d=%d", $it->max_ascent, $it->max_descent, $it->max_ascent+$it->max_descent
264 while ($i < $it->sp && $i < 4)
265 set $e = $it->stack[$i]
266 printf "stack[%d]: ", $i
268 printf "[%d]", $e.position.charpos
274 Pretty print a display iterator.
275 Take one arg, an iterator object or pointer.
282 Pretty print the display iterator it.
287 printf "y=%d x=%d pwid=%d", $row->y, $row->x, $row->pixel_width
288 printf " a+d=%d+%d=%d", $row->ascent, $row->height-$row->ascent, $row->height
289 printf " phys=%d+%d=%d", $row->phys_ascent, $row->phys_height-$row->phys_ascent, $row->phys_height
290 printf " vis=%d\n", $row->visible_height
291 printf "used=(LMargin=%d,Text=%d,RMargin=%d) Hash=%d\n", $row->used[0], $row->used[1], $row->used[2], $row->hash
292 printf "start=%d end=%d", $row->start.pos.charpos, $row->end.pos.charpos
296 if ($row->displays_text_p)
299 if ($row->mode_line_p)
302 if ($row->continued_p)
305 if ($row-> truncated_on_left_p)
308 if ($row-> truncated_on_right_p)
311 if ($row->starts_in_middle_of_char_p)
314 if ($row->ends_in_middle_of_char_p)
317 if ($row->ends_in_newline_from_string_p)
320 if ($row->ends_at_zv_p)
323 if ($row->overlapped_p)
326 if ($row->overlapping_p)
332 Pretty print information about glyph_row.
333 Takes one argument, a row object or pointer.
340 Pretty print information about glyph_row in row.
346 printf "y=%d x=%d vpos=%d hpos=%d", $cp->y, $cp->x, $cp->vpos, $cp->hpos
349 Pretty print a window cursor.
354 pcursorx output_cursor
358 Pretty print the output_cursor.
363 xgetint $w->sequence_number
364 if ($w->mini_p != Qnil)
367 printf "Window %d ", $int
369 set $tem = (struct buffer *) $ptr
371 printf "%s", ((struct Lisp_String *) $ptr)->data
374 set $tem = (struct Lisp_Marker *) $ptr
375 printf "start=%d end:", $tem->charpos
376 if ($w->window_end_valid != Qnil)
377 xgetint $w->window_end_pos
378 printf "pos=%d", $int
379 xgetint $w->window_end_vpos
380 printf " vpos=%d", $int
384 printf " vscroll=%d", $w->vscroll
385 if ($w->force_start != Qnil)
386 printf " FORCE_START"
388 if ($w->must_be_updated_p)
395 pcursorx $w->phys_cursor
396 if ($w->phys_cursor_on_p)
402 if ($w->last_cursor_off_p != $w->cursor_off_p)
403 if ($w->last_cursor_off_p)
409 if ($w->cursor_off_p)
417 Pretty print a window structure.
418 Takes one argument, a pointer to a window structure.
425 Pretty print window structure w.
450 if ($arg0 < 0 || $arg0 > 6)
455 Print textual description of bidi type given as first argument.
462 if ($g.u.ch >= ' ' && $g.u.ch < 127)
463 printf "CHAR[%c]", $g.u.ch
465 printf "CHAR[0x%x]", $g.u.ch
470 printf "COMP[%d (%d..%d)]", $g.u.cmp.id, $g.slice.cmp.from, $g.slice.cmp.to
475 if ($g.u.glyphless.method == 0)
478 if ($g.u.glyphless.method == 1)
481 if ($g.u.glyphless.method == 2)
484 if ($g.u.glyphless.method == 3)
490 printf "IMAGE[%d]", $g.u.img_id
494 printf "STRETCH[%d+%d]", $g.u.stretch.height, $g.u.stretch.ascent
497 if ($type == Lisp_String)
499 printf " str=0x%x[%d]", ((struct Lisp_String *)$ptr)->data, $g.charpos
501 printf " pos=%d", $g.charpos
503 # For characters, print their resolved level and bidi type
505 printf " blev=%d,btyp=", $g.resolved_level
506 pbiditype $g.bidi_type
508 printf " w=%d a+d=%d+%d", $g.pixel_width, $g.ascent, $g.descent
509 # If not DEFAULT_FACE_ID
511 printf " face=%d", $g.face_id
514 printf " vof=%d", $g.voffset
522 if ($g.glyph_not_available_p)
525 if ($g.overlaps_vertically_p)
528 if ($g.avoid_cursor_p)
531 if ($g.left_box_line_p)
534 if ($g.right_box_line_p)
537 if ($g.slice.img.x || $g.slice.img.y || $g.slice.img.width || $g.slice.img.height)
538 printf " slice=%d,%d,%d,%d" ,$g.slice.img.x, $g.slice.img.y, $g.slice.img.width, $g.slice.img.height
543 Pretty print a glyph structure.
544 Takes one argument, a pointer to a glyph structure.
552 Pretty print glyph structure glyph.
560 Pretty print glyph structure glyph[I].
561 Takes one argument, a integer I.
565 set $pgidx = $pgidx + 1
569 Pretty print next glyph structure.
577 set $used = $row->used[$area]
579 set $gl0 = $row->glyphs[$area]
581 printf "%s: %d glyphs\n", ($area == 0 ? "LEFT" : $area == 2 ? "RIGHT" : "TEXT"), $used
582 while ($pgidx < $used)
583 printf "%3d %4d: ", $pgidx, $xofs
585 set $xofs = $xofs + $gl0[$pgidx]->pixel_width
586 set $pgidx = $pgidx + 1
589 set $area = $area + 1
593 Pretty print all glyphs in a row structure.
594 Takes one argument, a pointer to a row structure.
601 Pretty print all glyphs in row structure row.
608 Pretty print all glyphs in it->glyph_row.
612 printf "edges=(%d,%d),r2l=%d,cont=%d,trunc=(%d,%d),at_zv=%d\n", $arg0->minpos.charpos, $arg0->maxpos.charpos, $arg0->reversed_p, $arg0->continued_p, $arg0->truncated_on_left_p, $arg0->truncated_on_right_p, $arg0->ends_at_zv_p
615 Print important attributes of a glyph_row structure.
616 Takes one argument, a pointer to a glyph_row structure.
622 set $glend = $mtx->rows + $mtx->nrows - 1
632 Print data about glyph rows in a glyph matrix.
633 Takes one argument, a pointer to a glyph_matrix structure.
640 if $type == Lisp_Misc
643 if $type == Lisp_Vectorlike
649 Print the type of $, assuming it is an Emacs Lisp value.
650 If the first type printed is Lisp_Vector or Lisp_Misc,
651 a second line gives the more precise type.
656 set $size = ((struct Lisp_Vector *) $ptr)->header.size
657 if ($size & PSEUDOVECTOR_FLAG)
658 output (enum pvec_type) (($size & PVEC_TYPE_MASK) >> PSEUDOVECTOR_SIZE_BITS)
660 output $size & ~ARRAY_MARK_FLAG
665 Print the size or vector subtype of $.
666 This command assumes that $ is a vector or pseudovector.
671 output (enum Lisp_Misc_Type) (((struct Lisp_Free *) $ptr)->type)
675 Assume that $ is some misc type and print its specific type.
683 Print $ as an Emacs Lisp integer. This gets the sign right.
691 Print the pointer portion of an Emacs Lisp value in $.
696 print (struct Lisp_Marker *) $ptr
699 Print $ as a marker pointer.
700 This command assumes that $ is an Emacs Lisp marker value.
705 print (struct Lisp_Overlay *) $ptr
708 Print $ as a overlay pointer.
709 This command assumes that $ is an Emacs Lisp overlay value.
714 print (struct Lisp_Free *) $ptr
717 Print $ as a misc free-cell pointer.
718 This command assumes that $ is an Emacs Lisp Misc value.
724 print (struct Lisp_Symbol *) $ptr
729 Print the name and address of the symbol $.
730 This command assumes that $ is an Emacs Lisp symbol value.
735 print (struct Lisp_String *) $ptr
740 Print the contents and address of the string $.
741 This command assumes that $ is an Emacs Lisp string value.
746 print (struct Lisp_Vector *) $ptr
747 output ($->header.size > 50) ? 0 : ($->contents[0])@($->header.size & ~ARRAY_MARK_FLAG)
751 Print the contents and address of the vector $.
752 This command assumes that $ is an Emacs Lisp vector value.
757 print (struct Lisp_Process *) $ptr
762 Print the address of the struct Lisp_process to which $ points.
763 This command assumes that $ is a Lisp_Object.
768 print (struct frame *) $ptr
770 set $ptr = (struct Lisp_String *) $ptr
775 Print $ as a frame pointer.
776 This command assumes $ is an Emacs Lisp frame value.
781 print (struct Lisp_Vector *) $ptr
782 output ($->contents[0])@($->header.size & 0xff)
785 Print $ as a compiled function pointer.
786 This command assumes that $ is an Emacs Lisp compiled value.
791 print (struct window *) $ptr
792 set $window = (struct window *) $ptr
793 xgetint $window->total_cols
795 xgetint $window->total_lines
797 xgetint $window->left_col
799 xgetint $window->top_line
801 printf "%dx%d+%d+%d\n", $width, $height, $left, $top
804 Print $ as a window pointer, assuming it is an Emacs Lisp window value.
805 Print the window's position as "WIDTHxHEIGHT+LEFT+TOP".
810 print (struct save_window_data *) $ptr
813 Print $ as a window configuration pointer.
814 This command assumes that $ is an Emacs Lisp window configuration value.
819 print (struct Lisp_Subr *) $ptr
824 Print the address of the subr which the Lisp_Object $ points to.
829 print (struct Lisp_Char_Table *) $ptr
832 printf " %d extra slots", ($->header.size & 0x1ff) - 68
836 Print the address of the char-table $, and its purpose.
837 This command assumes that $ is an Emacs Lisp char-table value.
842 print (struct Lisp_Sub_Char_Table *) $ptr
846 printf "Depth: %d, Min char: %d (0x%x)\n", $depth, $int, $int
848 document xsubchartable
849 Print the address of the sub-char-table $, its depth and min-char.
850 This command assumes that $ is an Emacs Lisp sub-char-table value.
855 print (struct Lisp_Bool_Vector *) $ptr
856 output ($->size > 256) ? 0 : ($->data[0])@(($->size + BOOL_VECTOR_BITS_PER_CHAR - 1)/ BOOL_VECTOR_BITS_PER_CHAR)
860 Print the contents and address of the bool-vector $.
861 This command assumes that $ is an Emacs Lisp bool-vector value.
866 print (struct buffer *) $ptr
868 output ((struct Lisp_String *) $ptr)->data
872 Set $ as a buffer pointer and the name of the buffer.
873 This command assumes $ is an Emacs Lisp buffer value.
878 print (struct Lisp_Hash_Table *) $ptr
881 Set $ as a hash table pointer.
882 This command assumes that $ is an Emacs Lisp hash table value.
887 print (struct Lisp_Cons *) $ptr
892 Print the contents of $ as an Emacs Lisp cons.
900 Print the contents of the next cell in a list.
901 This command assumes that the last thing you printed was a cons cell contents
902 (type struct Lisp_Cons) or a pointer to one.
907 print/x ($type == Lisp_Cons ? ((struct Lisp_Cons *) $ptr)->car : 0)
910 Assume that $ is an Emacs Lisp pair and print its car.
916 print/x ($type == Lisp_Cons ? ((struct Lisp_Cons *) $ptr)->u.cdr : 0)
919 Assume that $ is an Emacs Lisp pair and print its cdr.
924 set $cons = (struct Lisp_Cons *) $ptr
928 while $cons != $nil && $i < 10
932 set $cons = (struct Lisp_Cons *) $ptr
944 Print $ assuming it is a list.
949 print ((struct Lisp_Float *) $ptr)->u.data
952 Print $ assuming it is a lisp floating-point number.
957 print (struct scrollbar *) $ptr
962 Print $ as a scrollbar pointer.
967 if $type == Lisp_Int0 || $type == Lisp_Int1
970 if $type == Lisp_Symbol
973 if $type == Lisp_String
976 if $type == Lisp_Cons
979 if $type == Lisp_Float
982 if $type == Lisp_Misc
983 set $misc = (enum Lisp_Misc_Type) (((struct Lisp_Free *) $ptr)->type)
984 if $misc == Lisp_Misc_Free
987 if $misc == Lisp_Misc_Marker
990 if $misc == Lisp_Misc_Overlay
993 # if $misc == Lisp_Misc_Save_Value
997 if $type == Lisp_Vectorlike
998 set $size = ((struct Lisp_Vector *) $ptr)->header.size
999 if ($size & PSEUDOVECTOR_FLAG)
1000 set $vec = (enum pvec_type) (($size & PVEC_TYPE_MASK) >> PSEUDOVECTOR_SIZE_BITS)
1001 if $vec == PVEC_NORMAL_VECTOR
1004 if $vec == PVEC_PROCESS
1007 if $vec == PVEC_FRAME
1010 if $vec == PVEC_COMPILED
1013 if $vec == PVEC_WINDOW
1016 if $vec == PVEC_WINDOW_CONFIGURATION
1019 if $vec == PVEC_SUBR
1022 if $vec == PVEC_CHAR_TABLE
1025 if $vec == PVEC_BOOL_VECTOR
1028 if $vec == PVEC_BUFFER
1031 if $vec == PVEC_HASH_TABLE
1040 Print $ as a lisp object of any type.
1044 set $data = (char *) $arg0->data
1045 output ($arg0->size > 1000) ? 0 : ($data[0])@($arg0->size_byte < 0 ? $arg0->size & ~ARRAY_MARK_FLAG : $arg0->size_byte)
1050 set $sym = (struct Lisp_Symbol *) $ptr
1052 set $sym_name = (struct Lisp_String *) $ptr
1056 Print argument as a symbol.
1060 set $tmp = (struct Lisp_Hash_Table *) ((Vcoding_system_hash_table & VALMASK) | DATA_SEG_BITS)
1061 set $tmp = (struct Lisp_Vector *) (($tmp->key_and_value & VALMASK) | DATA_SEG_BITS)
1062 set $name = $tmp->contents[$arg0 * 2]
1065 print $tmp->contents[$arg0 * 2 + 1]
1069 Print the name and attributes of coding system that has ID (argument).
1073 set $tmp = (struct Lisp_Hash_Table *) ((Vcharset_hash_table & VALMASK) | DATA_SEG_BITS)
1074 set $tmp = (struct Lisp_Vector *) (($tmp->key_and_value & VALMASK) | DATA_SEG_BITS)
1075 p $tmp->contents[charset_table[$arg0].hash_index * 2]
1079 Print the name of charset that has ID (argument).
1084 set $tbl = (struct Lisp_Char_Table *) $ptr
1086 xgetint $tbl->extras[0]
1087 printf " ID:%d", $int
1088 xgettype $tbl->extras[1]
1089 xgetptr $tbl->extras[1]
1090 if $type == Lisp_String
1091 set $ptr = (struct Lisp_String *) $ptr
1095 xgetptr $tbl->extras[2]
1096 set $ptr = (struct Lisp_Char_Table *) $ptr
1097 xgetptr $ptr->extras[1]
1098 set $ptr = (struct Lisp_String *) $ptr
1099 printf " Realized from:"
1107 set $size = (((struct Lisp_Vector *) $ptr)->header.size & 0x1FF)
1108 if $size == FONT_SPEC_MAX
1109 print (struct font_spec *) $ptr
1111 if $size == FONT_ENTITY_MAX
1112 print (struct font_entity *) $ptr
1114 print (struct font *) $ptr
1119 Print $ assuming it is a list font (font-spec, font-entity, or font-object).
1123 set $bt = backtrace_list
1125 xgettype ($bt->function)
1126 if $type == Lisp_Symbol
1127 xprintsym ($bt->function)
1128 printf " (0x%x)\n", $bt->args
1130 xgetptr $bt->function
1131 printf "0x%x ", $ptr
1132 if $type == Lisp_Vectorlike
1133 xgetptr ($bt->function)
1134 set $size = ((struct Lisp_Vector *) $ptr)->header.size
1135 if ($size & PSEUDOVECTOR_FLAG)
1136 output (enum pvec_type) (($size & PVEC_TYPE_MASK) >> PSEUDOVECTOR_SIZE_BITS)
1138 output $size & ~ARRAY_MARK_FLAG
1141 printf "Lisp type %d", $type
1149 Print a backtrace of Lisp function calls from backtrace_list.
1150 Set a breakpoint at Fsignal and call this to see from where
1151 an error was signaled.
1154 define xprintbytestr
1155 set $data = (char *) $arg0->data
1157 output/u ($arg0->size > 1000) ? 0 : ($data[0])@($arg0->size_byte < 0 ? $arg0->size & ~ARRAY_MARK_FLAG : $arg0->size_byte)
1159 document xprintbytestr
1160 Print a string of byte code.
1163 define xwhichsymbols
1164 set $output_debug = print_output_debug_flag
1165 set print_output_debug_flag = 0
1166 call safe_debug_print (which_symbols ($arg0, $arg1))
1167 set print_output_debug_flag = $output_debug
1169 document xwhichsymbols
1170 Print symbols which references a given lisp object
1171 either as its symbol value or symbol function.
1172 Call with two arguments: the lisp object and the
1173 maximum number of symbols referencing it to produce.
1177 set $bt = byte_stack_list
1179 xgetptr $bt->byte_string
1180 set $ptr = (struct Lisp_String *) $ptr
1182 printf "\n0x%x => ", $bt->byte_string
1183 xwhichsymbols $bt->byte_string 5
1188 Print a backtrace of the byte code stack.
1191 # Show Lisp backtrace after normal backtrace.
1192 define hookpost-backtrace
1193 set $bt = backtrace_list
1196 echo Lisp Backtrace:\n
1201 # Flush display (X only)
1206 Flush pending X window display updates to screen.
1207 Works only when an inferior emacs is executing.
1212 set print sevenbit-strings
1214 show environment DISPLAY
1215 show environment TERM
1217 # When debugging, it is handy to be able to "return" from
1218 # terminate_due_to_signal when an assertion failure is non-fatal.
1219 break terminate_due_to_signal
1221 # x_error_quitter is defined only on X. But window-system is set up
1222 # only at run time, during Emacs startup, so we need to defer setting
1223 # the breakpoint. init_sys_modes is the first function called on
1224 # every platform after init_display, where window-system is set.
1225 tbreak init_sys_modes
1228 xgetptr globals.f_Vinitial_window_system
1229 set $tem = (struct Lisp_Symbol *) $ptr
1231 set $tem = (struct Lisp_String *) $ptr
1232 set $tem = (char *) $tem->data
1233 # If we are running in synchronous mode, we want a chance to look
1234 # around before Emacs exits. Perhaps we should put the break
1235 # somewhere else instead...
1236 if $tem[0] == 'x' && $tem[1] == '\0'
1237 break x_error_quitter