1 /* General GDB/Guile code.
3 Copyright (C) 2014-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 /* See README file in this directory for implementation notes, coding
21 conventions, et.al. */
24 #include "breakpoint.h"
25 #include "cli/cli-cmds.h"
26 #include "cli/cli-script.h"
27 #include "cli/cli-utils.h"
31 #include "extension-priv.h"
36 #include "guile-internal.h"
40 /* The Guile version we're using.
41 We *could* use the macros in libguile/version.h but that would preclude
42 handling the user switching in a different version with, e.g.,
43 LD_LIBRARY_PATH (using a different version than what gdb was compiled with
44 is not something to be done lightly, but can be useful). */
45 int gdbscm_guile_major_version
;
46 int gdbscm_guile_minor_version
;
47 int gdbscm_guile_micro_version
;
49 /* The guile subdirectory within gdb's data-directory. */
50 static const char *guile_datadir
;
52 /* Declared constants and enum for guile exception printing. */
53 const char gdbscm_print_excp_none
[] = "none";
54 const char gdbscm_print_excp_full
[] = "full";
55 const char gdbscm_print_excp_message
[] = "message";
57 /* "set guile print-stack" choices. */
58 static const char *const guile_print_excp_enums
[] =
60 gdbscm_print_excp_none
,
61 gdbscm_print_excp_full
,
62 gdbscm_print_excp_message
,
66 /* The exception printing variable. 'full' if we want to print the
67 error message and stack, 'none' if we want to print nothing, and
68 'message' if we only want to print the error message. 'message' is
70 const char *gdbscm_print_excp
= gdbscm_print_excp_message
;
73 /* Forward decls, these are defined later. */
74 extern const struct extension_language_script_ops guile_extension_script_ops
;
75 extern const struct extension_language_ops guile_extension_ops
;
78 /* The main struct describing GDB's interface to the Guile
79 extension language. */
80 extern const struct extension_language_defn extension_language_guile
=
92 &guile_extension_script_ops
,
102 static void gdbscm_finish_initialization
103 (const struct extension_language_defn
*);
104 static int gdbscm_initialized (const struct extension_language_defn
*);
105 static void gdbscm_eval_from_control_command
106 (const struct extension_language_defn
*, struct command_line
*);
107 static script_sourcer_func gdbscm_source_script
;
109 int gdb_scheme_initialized
;
111 /* Symbol for setting documentation strings. */
112 SCM gdbscm_documentation_symbol
;
114 /* Keywords used by various functions. */
115 static SCM from_tty_keyword
;
116 static SCM to_string_keyword
;
118 /* The name of the various modules (without the surrounding parens). */
119 const char gdbscm_module_name
[] = "gdb";
120 const char gdbscm_init_module_name
[] = "gdb";
122 /* The name of the bootstrap file. */
123 static const char boot_scm_filename
[] = "boot.scm";
125 /* The interface between gdb proper and loading of python scripts. */
127 const struct extension_language_script_ops guile_extension_script_ops
=
129 gdbscm_source_script
,
130 gdbscm_source_objfile_script
,
131 gdbscm_execute_objfile_script
,
132 gdbscm_auto_load_enabled
135 /* The interface between gdb proper and guile scripting. */
137 const struct extension_language_ops guile_extension_ops
=
139 gdbscm_finish_initialization
,
142 gdbscm_eval_from_control_command
,
144 NULL
, /* gdbscm_start_type_printers, */
145 NULL
, /* gdbscm_apply_type_printers, */
146 NULL
, /* gdbscm_free_type_printers, */
148 gdbscm_apply_val_pretty_printer
,
150 NULL
, /* gdbscm_apply_frame_filter, */
152 gdbscm_preserve_values
,
154 gdbscm_breakpoint_has_cond
,
155 gdbscm_breakpoint_cond_says_stop
,
157 NULL
, /* gdbscm_check_quit_flag, */
158 NULL
, /* gdbscm_set_quit_flag, */
161 /* Implementation of the gdb "guile-repl" command. */
164 guile_repl_command (char *arg
, int from_tty
)
166 struct cleanup
*cleanup
;
168 cleanup
= make_cleanup_restore_integer (¤t_ui
->async
);
169 current_ui
->async
= 0;
171 arg
= skip_spaces (arg
);
173 /* This explicitly rejects any arguments for now.
174 "It is easier to relax a restriction than impose one after the fact."
175 We would *like* to be able to pass arguments to the interactive shell
176 but that's not what python-interactive does. Until there is time to
177 sort it out, we forbid arguments. */
180 error (_("guile-repl currently does not take any arguments."));
184 gdbscm_enter_repl ();
187 do_cleanups (cleanup
);
190 /* Implementation of the gdb "guile" command.
191 Note: Contrary to the Python version this displays the result.
192 Have to see which is better.
194 TODO: Add the result to Guile's history? */
197 guile_command (char *arg
, int from_tty
)
199 struct cleanup
*cleanup
;
201 cleanup
= make_cleanup_restore_integer (¤t_ui
->async
);
202 current_ui
->async
= 0;
204 arg
= skip_spaces (arg
);
208 char *msg
= gdbscm_safe_eval_string (arg
, 1);
212 make_cleanup (xfree
, msg
);
218 command_line_up l
= get_command_line (guile_control
, "");
220 execute_control_command_untraced (l
.get ());
223 do_cleanups (cleanup
);
226 /* Given a command_line, return a command string suitable for passing
227 to Guile. Lines in the string are separated by newlines. The return
228 value is allocated using xmalloc and the caller is responsible for
232 compute_scheme_string (struct command_line
*l
)
234 struct command_line
*iter
;
239 for (iter
= l
; iter
; iter
= iter
->next
)
240 size
+= strlen (iter
->line
) + 1;
242 script
= (char *) xmalloc (size
+ 1);
244 for (iter
= l
; iter
; iter
= iter
->next
)
246 int len
= strlen (iter
->line
);
248 strcpy (&script
[here
], iter
->line
);
250 script
[here
++] = '\n';
256 /* Take a command line structure representing a "guile" command, and
257 evaluate its body using the Guile interpreter.
258 This is the extension_language_ops.eval_from_control_command "method". */
261 gdbscm_eval_from_control_command
262 (const struct extension_language_defn
*extlang
, struct command_line
*cmd
)
265 struct cleanup
*cleanup
;
267 if (cmd
->body_count
!= 1)
268 error (_("Invalid \"guile\" block structure."));
270 cleanup
= make_cleanup (null_cleanup
, NULL
);
272 script
= compute_scheme_string (cmd
->body_list
[0]);
273 msg
= gdbscm_safe_eval_string (script
, 0);
277 make_cleanup (xfree
, msg
);
281 do_cleanups (cleanup
);
284 /* Read a file as Scheme code.
285 This is the extension_language_script_ops.script_sourcer "method".
286 FILE is the file to run. FILENAME is name of the file FILE.
287 This does not throw any errors. If an exception occurs an error message
291 gdbscm_source_script (const struct extension_language_defn
*extlang
,
292 FILE *file
, const char *filename
)
294 char *msg
= gdbscm_safe_source_script (filename
);
298 fprintf_filtered (gdb_stderr
, "%s\n", msg
);
303 /* (execute string [#:from-tty boolean] [#:to-string boolean])
304 A Scheme function which evaluates a string using the gdb CLI. */
307 gdbscm_execute_gdb_command (SCM command_scm
, SCM rest
)
309 int from_tty_arg_pos
= -1, to_string_arg_pos
= -1;
310 int from_tty
= 0, to_string
= 0;
311 const SCM keywords
[] = { from_tty_keyword
, to_string_keyword
, SCM_BOOL_F
};
313 struct cleanup
*cleanups
;
314 struct gdb_exception except
= exception_none
;
316 gdbscm_parse_function_args (FUNC_NAME
, SCM_ARG1
, keywords
, "s#tt",
317 command_scm
, &command
, rest
,
318 &from_tty_arg_pos
, &from_tty
,
319 &to_string_arg_pos
, &to_string
);
321 /* Note: The contents of "command" may get modified while it is
323 cleanups
= make_cleanup (xfree
, command
);
325 std::string to_string_res
;
329 struct cleanup
*inner_cleanups
;
331 inner_cleanups
= make_cleanup_restore_integer (¤t_ui
->async
);
332 current_ui
->async
= 0;
334 scoped_restore preventer
= prevent_dont_repeat ();
336 to_string_res
= execute_command_to_string (command
, from_tty
);
338 execute_command (command
, from_tty
);
340 /* Do any commands attached to breakpoint we stopped at. */
341 bpstat_do_actions ();
343 do_cleanups (inner_cleanups
);
345 CATCH (ex
, RETURN_MASK_ALL
)
351 do_cleanups (cleanups
);
352 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
355 return gdbscm_scm_from_c_string (to_string_res
.c_str ());
356 return SCM_UNSPECIFIED
;
359 /* (data-directory) -> string */
362 gdbscm_data_directory (void)
364 return gdbscm_scm_from_c_string (gdb_datadir
);
367 /* (guile-data-directory) -> string */
370 gdbscm_guile_data_directory (void)
372 return gdbscm_scm_from_c_string (guile_datadir
);
375 /* (gdb-version) -> string */
378 gdbscm_gdb_version (void)
380 return gdbscm_scm_from_c_string (version
);
383 /* (host-config) -> string */
386 gdbscm_host_config (void)
388 return gdbscm_scm_from_c_string (host_name
);
391 /* (target-config) -> string */
394 gdbscm_target_config (void)
396 return gdbscm_scm_from_c_string (target_name
);
399 #else /* ! HAVE_GUILE */
401 /* Dummy implementation of the gdb "guile-repl" and "guile"
405 guile_repl_command (char *arg
, int from_tty
)
407 arg
= skip_spaces (arg
);
409 error (_("guile-repl currently does not take any arguments."));
410 error (_("Guile scripting is not supported in this copy of GDB."));
414 guile_command (char *arg
, int from_tty
)
416 arg
= skip_spaces (arg
);
418 error (_("Guile scripting is not supported in this copy of GDB."));
421 /* Even if Guile isn't enabled, we still have to slurp the
422 command list to the corresponding "end". */
423 command_line_up l
= get_command_line (guile_control
, "");
425 execute_control_command_untraced (l
.get ());
429 #endif /* ! HAVE_GUILE */
431 /* Lists for 'set,show,info guile' commands. */
433 static struct cmd_list_element
*set_guile_list
;
434 static struct cmd_list_element
*show_guile_list
;
435 static struct cmd_list_element
*info_guile_list
;
437 /* Function for use by 'set guile' prefix command. */
440 set_guile_command (char *args
, int from_tty
)
442 help_list (set_guile_list
, "set guile ", all_commands
, gdb_stdout
);
445 /* Function for use by 'show guile' prefix command. */
448 show_guile_command (char *args
, int from_tty
)
450 cmd_show_list (show_guile_list
, from_tty
, "");
453 /* The "info scheme" command is defined as a prefix, with
454 allow_unknown 0. Therefore, its own definition is called only for
455 "info scheme" with no args. */
458 info_guile_command (char *args
, int from_tty
)
460 printf_unfiltered (_("\"info guile\" must be followed"
461 " by the name of an info command.\n"));
462 help_list (info_guile_list
, "info guile ", all_commands
, gdb_stdout
);
465 /* Initialization. */
469 static const scheme_function misc_guile_functions
[] =
471 { "execute", 1, 0, 1, as_a_scm_t_subr (gdbscm_execute_gdb_command
),
473 Execute the given GDB command.\n\
475 Arguments: string [#:to-string boolean] [#:from-tty boolean]\n\
476 If #:from-tty is true then the command executes as if entered\n\
477 from the keyboard. The default is false (#f).\n\
478 If #:to-string is true then the result is returned as a string.\n\
479 Otherwise output is sent to the current output port,\n\
480 which is the default.\n\
481 Returns: The result of the command if #:to-string is true.\n\
482 Otherwise returns unspecified." },
484 { "data-directory", 0, 0, 0, as_a_scm_t_subr (gdbscm_data_directory
),
486 Return the name of GDB's data directory." },
488 { "guile-data-directory", 0, 0, 0,
489 as_a_scm_t_subr (gdbscm_guile_data_directory
),
491 Return the name of the Guile directory within GDB's data directory." },
493 { "gdb-version", 0, 0, 0, as_a_scm_t_subr (gdbscm_gdb_version
),
495 Return GDB's version string." },
497 { "host-config", 0, 0, 0, as_a_scm_t_subr (gdbscm_host_config
),
499 Return the name of the host configuration." },
501 { "target-config", 0, 0, 0, as_a_scm_t_subr (gdbscm_target_config
),
503 Return the name of the target configuration." },
508 /* Load BOOT_SCM_FILE, the first Scheme file that gets loaded. */
511 boot_guile_support (void *boot_scm_file
)
513 /* Load boot.scm without compiling it (there's no need to compile it).
514 The other files should have been compiled already, and boot.scm is
515 expected to adjust '%load-compiled-path' accordingly. If they haven't
516 been compiled, Guile will auto-compile them. The important thing to keep
517 in mind is that there's a >= 100x speed difference between compiled and
518 non-compiled files. */
519 return scm_c_primitive_load ((const char *) boot_scm_file
);
522 /* Return non-zero if ARGS has the "standard" format for throw args.
523 The standard format is:
524 (function format-string (format-string-args-list) ...).
525 FUNCTION is #f if no function was recorded. */
528 standard_throw_args_p (SCM args
)
530 if (gdbscm_is_true (scm_list_p (args
))
531 && scm_ilength (args
) >= 3)
533 /* The function in which the error occurred. */
534 SCM arg0
= scm_list_ref (args
, scm_from_int (0));
535 /* The format string. */
536 SCM arg1
= scm_list_ref (args
, scm_from_int (1));
537 /* The arguments of the format string. */
538 SCM arg2
= scm_list_ref (args
, scm_from_int (2));
540 if ((scm_is_string (arg0
) || gdbscm_is_false (arg0
))
541 && scm_is_string (arg1
)
542 && gdbscm_is_true (scm_list_p (arg2
)))
549 /* Print the error recorded in a "standard" throw args. */
552 print_standard_throw_error (SCM args
)
554 /* The function in which the error occurred. */
555 SCM arg0
= scm_list_ref (args
, scm_from_int (0));
556 /* The format string. */
557 SCM arg1
= scm_list_ref (args
, scm_from_int (1));
558 /* The arguments of the format string. */
559 SCM arg2
= scm_list_ref (args
, scm_from_int (2));
561 /* ARG0 is #f if no function was recorded. */
562 if (gdbscm_is_true (arg0
))
564 scm_simple_format (scm_current_error_port (),
565 scm_from_latin1_string (_("Error in function ~s:~%")),
568 scm_simple_format (scm_current_error_port (), arg1
, arg2
);
571 /* Print the error message recorded in KEY, ARGS, the arguments to throw.
572 Normally we let Scheme print the error message.
573 This function is used when Scheme initialization fails.
574 We can still use the Scheme C API though. */
577 print_throw_error (SCM key
, SCM args
)
579 /* IWBN to call gdbscm_print_exception_with_stack here, but Guile didn't
580 boot successfully so play it safe and avoid it. The "format string" and
581 its args are embedded in ARGS, but the content of ARGS depends on KEY.
582 Make sure ARGS has the expected canonical content before trying to use
584 if (standard_throw_args_p (args
))
585 print_standard_throw_error (args
);
588 scm_simple_format (scm_current_error_port (),
589 scm_from_latin1_string (_("Throw to key `~a' with args `~s'.~%")),
590 scm_list_2 (key
, args
));
594 /* Handle an exception thrown while loading BOOT_SCM_FILE. */
597 handle_boot_error (void *boot_scm_file
, SCM key
, SCM args
)
599 fprintf_unfiltered (gdb_stderr
, ("Exception caught while booting Guile.\n"));
601 print_throw_error (key
, args
);
603 fprintf_unfiltered (gdb_stderr
, "\n");
604 warning (_("Could not complete Guile gdb module initialization from:\n"
606 "Limited Guile support is available.\n"
607 "Suggest passing --data-directory=/path/to/gdb/data-directory.\n"),
608 (const char *) boot_scm_file
);
610 return SCM_UNSPECIFIED
;
613 /* Load gdb/boot.scm, the Scheme side of GDB/Guile support.
614 Note: This function assumes it's called within the gdb module. */
617 initialize_scheme_side (void)
622 guile_datadir
= concat (gdb_datadir
, SLASH_STRING
, "guile", (char *) NULL
);
623 boot_scm_path
= concat (guile_datadir
, SLASH_STRING
, "gdb",
624 SLASH_STRING
, boot_scm_filename
, (char *) NULL
);
626 scm_c_catch (SCM_BOOL_T
, boot_guile_support
, boot_scm_path
,
627 handle_boot_error
, boot_scm_path
, NULL
, NULL
);
629 xfree (boot_scm_path
);
632 /* Install the gdb scheme module.
633 The result is a boolean indicating success.
634 If initializing the gdb module fails an error message is printed.
635 Note: This function runs in the context of the gdb module. */
638 initialize_gdb_module (void *data
)
640 /* Computing these is a pain, so only do it once.
641 Also, do it here and save the result so that obtaining the values
643 gdbscm_guile_major_version
= gdbscm_scm_string_to_int (scm_major_version ());
644 gdbscm_guile_minor_version
= gdbscm_scm_string_to_int (scm_minor_version ());
645 gdbscm_guile_micro_version
= gdbscm_scm_string_to_int (scm_micro_version ());
647 /* The documentation symbol needs to be defined before any calls to
648 gdbscm_define_{variables,functions}. */
649 gdbscm_documentation_symbol
= scm_from_latin1_symbol ("documentation");
651 /* The smob and exception support must be initialized early. */
652 gdbscm_initialize_smobs ();
653 gdbscm_initialize_exceptions ();
655 /* The rest are initialized in alphabetical order. */
656 gdbscm_initialize_arches ();
657 gdbscm_initialize_auto_load ();
658 gdbscm_initialize_blocks ();
659 gdbscm_initialize_breakpoints ();
660 gdbscm_initialize_commands ();
661 gdbscm_initialize_disasm ();
662 gdbscm_initialize_frames ();
663 gdbscm_initialize_iterators ();
664 gdbscm_initialize_lazy_strings ();
665 gdbscm_initialize_math ();
666 gdbscm_initialize_objfiles ();
667 gdbscm_initialize_parameters ();
668 gdbscm_initialize_ports ();
669 gdbscm_initialize_pretty_printers ();
670 gdbscm_initialize_pspaces ();
671 gdbscm_initialize_strings ();
672 gdbscm_initialize_symbols ();
673 gdbscm_initialize_symtabs ();
674 gdbscm_initialize_types ();
675 gdbscm_initialize_values ();
677 gdbscm_define_functions (misc_guile_functions
, 1);
679 from_tty_keyword
= scm_from_latin1_keyword ("from-tty");
680 to_string_keyword
= scm_from_latin1_keyword ("to-string");
682 initialize_scheme_side ();
684 gdb_scheme_initialized
= 1;
687 /* Utility to call scm_c_define_module+initialize_gdb_module from
688 within scm_with_guile. */
691 call_initialize_gdb_module (void *data
)
693 /* Most of the initialization is done by initialize_gdb_module.
694 It is called via scm_c_define_module so that the initialization is
695 performed within the desired module. */
696 scm_c_define_module (gdbscm_module_name
, initialize_gdb_module
, NULL
);
698 #if HAVE_GUILE_MANUAL_FINALIZATION
699 scm_run_finalizers ();
705 /* A callback to finish Guile initialization after gdb has finished all its
707 This is the extension_language_ops.finish_initialization "method". */
710 gdbscm_finish_initialization (const struct extension_language_defn
*extlang
)
712 /* Restore the environment to the user interaction one. */
713 scm_set_current_module (scm_interaction_environment ());
716 /* The extension_language_ops.initialized "method". */
719 gdbscm_initialized (const struct extension_language_defn
*extlang
)
721 return gdb_scheme_initialized
;
724 /* Enable or disable Guile backtraces. */
727 gdbscm_set_backtrace (int enable
)
729 static const char disable_bt
[] = "(debug-disable 'backtrace)";
730 static const char enable_bt
[] = "(debug-enable 'backtrace)";
733 gdbscm_safe_eval_string (enable_bt
, 0);
735 gdbscm_safe_eval_string (disable_bt
, 0);
738 #endif /* HAVE_GUILE */
740 /* Install the various gdb commands used by Guile. */
743 install_gdb_commands (void)
745 add_com ("guile-repl", class_obscure
,
749 Start an interactive Guile prompt.\n\
751 To return to GDB, type the EOF character (e.g., Ctrl-D on an empty\n\
753 #else /* HAVE_GUILE */
755 Start a Guile interactive prompt.\n\
757 Guile scripting is not supported in this copy of GDB.\n\
758 This command is only a placeholder.")
759 #endif /* HAVE_GUILE */
761 add_com_alias ("gr", "guile-repl", class_obscure
, 1);
763 /* Since "help guile" is easy to type, and intuitive, we add general help
764 in using GDB+Guile to this command. */
765 add_com ("guile", class_obscure
, guile_command
,
768 Evaluate one or more Guile expressions.\n\
770 The expression(s) can be given as an argument, for instance:\n\
772 guile (display 23)\n\
774 The result of evaluating the last expression is printed.\n\
776 If no argument is given, the following lines are read and passed\n\
777 to Guile for evaluation. Type a line containing \"end\" to indicate\n\
778 the end of the set of expressions.\n\
780 The Guile GDB module must first be imported before it can be used.\n\
782 (gdb) guile (use-modules (gdb))\n\
783 or if you want to import the (gdb) module with a prefix, use:\n\
784 (gdb) guile (use-modules ((gdb) #:renamer (symbol-prefix-proc 'gdb:)))\n\
786 The Guile interactive session, started with the \"guile-repl\"\n\
787 command, provides extensive help and apropos capabilities.\n\
788 Type \",help\" once in a Guile interactive session.")
789 #else /* HAVE_GUILE */
791 Evaluate a Guile expression.\n\
793 Guile scripting is not supported in this copy of GDB.\n\
794 This command is only a placeholder.")
795 #endif /* HAVE_GUILE */
797 add_com_alias ("gu", "guile", class_obscure
, 1);
799 add_prefix_cmd ("guile", class_obscure
, set_guile_command
,
800 _("Prefix command for Guile preference settings."),
801 &set_guile_list
, "set guile ", 0,
803 add_alias_cmd ("gu", "guile", class_obscure
, 1, &setlist
);
805 add_prefix_cmd ("guile", class_obscure
, show_guile_command
,
806 _("Prefix command for Guile preference settings."),
807 &show_guile_list
, "show guile ", 0,
809 add_alias_cmd ("gu", "guile", class_obscure
, 1, &showlist
);
811 add_prefix_cmd ("guile", class_obscure
, info_guile_command
,
812 _("Prefix command for Guile info displays."),
813 &info_guile_list
, "info guile ", 0,
815 add_info_alias ("gu", "guile", 1);
817 /* The name "print-stack" is carried over from Python.
818 A better name is "print-exception". */
819 add_setshow_enum_cmd ("print-stack", no_class
, guile_print_excp_enums
,
820 &gdbscm_print_excp
, _("\
821 Set mode for Guile exception printing on error."), _("\
822 Show the mode of Guile exception printing on error."), _("\
823 none == no stack or message will be printed.\n\
824 full == a message and a stack will be printed.\n\
825 message == an error message without a stack will be printed."),
827 &set_guile_list
, &show_guile_list
);
830 /* Provide a prototype to silence -Wmissing-prototypes. */
831 extern initialize_file_ftype _initialize_guile
;
834 _initialize_guile (void)
836 install_gdb_commands ();
840 #ifdef HAVE_SIGPROCMASK
841 sigset_t sigchld_mask
, prev_mask
;
844 /* The Python support puts the C side in module "_gdb", leaving the Python
845 side to define module "gdb" which imports "_gdb". There is evidently no
846 similar convention in Guile so we skip this. */
848 #if HAVE_GUILE_MANUAL_FINALIZATION
849 /* Our SMOB free functions are not thread-safe, as GDB itself is not
850 intended to be thread-safe. Disable automatic finalization so that
851 finalizers aren't run in other threads. */
852 scm_set_automatic_finalization_enabled (0);
855 #ifdef HAVE_SIGPROCMASK
856 /* Before we initialize Guile, block SIGCHLD.
857 This is done so that all threads created during Guile initialization
858 have SIGCHLD blocked. PR 17247.
859 Really libgc and Guile should do this, but we need to work with
861 sigemptyset (&sigchld_mask
);
862 sigaddset (&sigchld_mask
, SIGCHLD
);
863 sigprocmask (SIG_BLOCK
, &sigchld_mask
, &prev_mask
);
866 /* scm_with_guile is the most portable way to initialize Guile.
867 Plus we need to initialize the Guile support while in Guile mode
868 (e.g., called from within a call to scm_with_guile). */
869 scm_with_guile (call_initialize_gdb_module
, NULL
);
871 #ifdef HAVE_SIGPROCMASK
872 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
875 /* Set Guile's backtrace to match the "set guile print-stack" default.
876 [N.B. The two settings are still separate.]
877 But only do this after we've initialized Guile, it's nice to see a
878 backtrace if there's an error during initialization.
879 OTOH, if the error is that gdb/init.scm wasn't found because gdb is
880 being run from the build tree, the backtrace is more noise than signal.
882 gdbscm_set_backtrace (0);