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 struct command_line
*l
= get_command_line (guile_control
, "");
220 make_cleanup_free_command_lines (&l
);
221 execute_control_command_untraced (l
);
224 do_cleanups (cleanup
);
227 /* Given a command_line, return a command string suitable for passing
228 to Guile. Lines in the string are separated by newlines. The return
229 value is allocated using xmalloc and the caller is responsible for
233 compute_scheme_string (struct command_line
*l
)
235 struct command_line
*iter
;
240 for (iter
= l
; iter
; iter
= iter
->next
)
241 size
+= strlen (iter
->line
) + 1;
243 script
= (char *) xmalloc (size
+ 1);
245 for (iter
= l
; iter
; iter
= iter
->next
)
247 int len
= strlen (iter
->line
);
249 strcpy (&script
[here
], iter
->line
);
251 script
[here
++] = '\n';
257 /* Take a command line structure representing a "guile" command, and
258 evaluate its body using the Guile interpreter.
259 This is the extension_language_ops.eval_from_control_command "method". */
262 gdbscm_eval_from_control_command
263 (const struct extension_language_defn
*extlang
, struct command_line
*cmd
)
266 struct cleanup
*cleanup
;
268 if (cmd
->body_count
!= 1)
269 error (_("Invalid \"guile\" block structure."));
271 cleanup
= make_cleanup (null_cleanup
, NULL
);
273 script
= compute_scheme_string (cmd
->body_list
[0]);
274 msg
= gdbscm_safe_eval_string (script
, 0);
278 make_cleanup (xfree
, msg
);
282 do_cleanups (cleanup
);
285 /* Read a file as Scheme code.
286 This is the extension_language_script_ops.script_sourcer "method".
287 FILE is the file to run. FILENAME is name of the file FILE.
288 This does not throw any errors. If an exception occurs an error message
292 gdbscm_source_script (const struct extension_language_defn
*extlang
,
293 FILE *file
, const char *filename
)
295 char *msg
= gdbscm_safe_source_script (filename
);
299 fprintf_filtered (gdb_stderr
, "%s\n", msg
);
304 /* (execute string [#:from-tty boolean] [#:to-string boolean])
305 A Scheme function which evaluates a string using the gdb CLI. */
308 gdbscm_execute_gdb_command (SCM command_scm
, SCM rest
)
310 int from_tty_arg_pos
= -1, to_string_arg_pos
= -1;
311 int from_tty
= 0, to_string
= 0;
312 const SCM keywords
[] = { from_tty_keyword
, to_string_keyword
, SCM_BOOL_F
};
314 struct cleanup
*cleanups
;
315 struct gdb_exception except
= exception_none
;
317 gdbscm_parse_function_args (FUNC_NAME
, SCM_ARG1
, keywords
, "s#tt",
318 command_scm
, &command
, rest
,
319 &from_tty_arg_pos
, &from_tty
,
320 &to_string_arg_pos
, &to_string
);
322 /* Note: The contents of "command" may get modified while it is
324 cleanups
= make_cleanup (xfree
, command
);
326 std::string to_string_res
;
330 struct cleanup
*inner_cleanups
;
332 inner_cleanups
= make_cleanup_restore_integer (¤t_ui
->async
);
333 current_ui
->async
= 0;
335 scoped_restore preventer
= prevent_dont_repeat ();
337 to_string_res
= execute_command_to_string (command
, from_tty
);
339 execute_command (command
, from_tty
);
341 /* Do any commands attached to breakpoint we stopped at. */
342 bpstat_do_actions ();
344 do_cleanups (inner_cleanups
);
346 CATCH (ex
, RETURN_MASK_ALL
)
352 do_cleanups (cleanups
);
353 GDBSCM_HANDLE_GDB_EXCEPTION (except
);
356 return gdbscm_scm_from_c_string (to_string_res
.c_str ());
357 return SCM_UNSPECIFIED
;
360 /* (data-directory) -> string */
363 gdbscm_data_directory (void)
365 return gdbscm_scm_from_c_string (gdb_datadir
);
368 /* (guile-data-directory) -> string */
371 gdbscm_guile_data_directory (void)
373 return gdbscm_scm_from_c_string (guile_datadir
);
376 /* (gdb-version) -> string */
379 gdbscm_gdb_version (void)
381 return gdbscm_scm_from_c_string (version
);
384 /* (host-config) -> string */
387 gdbscm_host_config (void)
389 return gdbscm_scm_from_c_string (host_name
);
392 /* (target-config) -> string */
395 gdbscm_target_config (void)
397 return gdbscm_scm_from_c_string (target_name
);
400 #else /* ! HAVE_GUILE */
402 /* Dummy implementation of the gdb "guile-repl" and "guile"
406 guile_repl_command (char *arg
, int from_tty
)
408 arg
= skip_spaces (arg
);
410 error (_("guile-repl currently does not take any arguments."));
411 error (_("Guile scripting is not supported in this copy of GDB."));
415 guile_command (char *arg
, int from_tty
)
417 arg
= skip_spaces (arg
);
419 error (_("Guile scripting is not supported in this copy of GDB."));
422 /* Even if Guile isn't enabled, we still have to slurp the
423 command list to the corresponding "end". */
424 struct command_line
*l
= get_command_line (guile_control
, "");
425 struct cleanup
*cleanups
= make_cleanup_free_command_lines (&l
);
427 execute_control_command_untraced (l
);
428 do_cleanups (cleanups
);
432 #endif /* ! HAVE_GUILE */
434 /* Lists for 'set,show,info guile' commands. */
436 static struct cmd_list_element
*set_guile_list
;
437 static struct cmd_list_element
*show_guile_list
;
438 static struct cmd_list_element
*info_guile_list
;
440 /* Function for use by 'set guile' prefix command. */
443 set_guile_command (char *args
, int from_tty
)
445 help_list (set_guile_list
, "set guile ", all_commands
, gdb_stdout
);
448 /* Function for use by 'show guile' prefix command. */
451 show_guile_command (char *args
, int from_tty
)
453 cmd_show_list (show_guile_list
, from_tty
, "");
456 /* The "info scheme" command is defined as a prefix, with
457 allow_unknown 0. Therefore, its own definition is called only for
458 "info scheme" with no args. */
461 info_guile_command (char *args
, int from_tty
)
463 printf_unfiltered (_("\"info guile\" must be followed"
464 " by the name of an info command.\n"));
465 help_list (info_guile_list
, "info guile ", all_commands
, gdb_stdout
);
468 /* Initialization. */
472 static const scheme_function misc_guile_functions
[] =
474 { "execute", 1, 0, 1, as_a_scm_t_subr (gdbscm_execute_gdb_command
),
476 Execute the given GDB command.\n\
478 Arguments: string [#:to-string boolean] [#:from-tty boolean]\n\
479 If #:from-tty is true then the command executes as if entered\n\
480 from the keyboard. The default is false (#f).\n\
481 If #:to-string is true then the result is returned as a string.\n\
482 Otherwise output is sent to the current output port,\n\
483 which is the default.\n\
484 Returns: The result of the command if #:to-string is true.\n\
485 Otherwise returns unspecified." },
487 { "data-directory", 0, 0, 0, as_a_scm_t_subr (gdbscm_data_directory
),
489 Return the name of GDB's data directory." },
491 { "guile-data-directory", 0, 0, 0,
492 as_a_scm_t_subr (gdbscm_guile_data_directory
),
494 Return the name of the Guile directory within GDB's data directory." },
496 { "gdb-version", 0, 0, 0, as_a_scm_t_subr (gdbscm_gdb_version
),
498 Return GDB's version string." },
500 { "host-config", 0, 0, 0, as_a_scm_t_subr (gdbscm_host_config
),
502 Return the name of the host configuration." },
504 { "target-config", 0, 0, 0, as_a_scm_t_subr (gdbscm_target_config
),
506 Return the name of the target configuration." },
511 /* Load BOOT_SCM_FILE, the first Scheme file that gets loaded. */
514 boot_guile_support (void *boot_scm_file
)
516 /* Load boot.scm without compiling it (there's no need to compile it).
517 The other files should have been compiled already, and boot.scm is
518 expected to adjust '%load-compiled-path' accordingly. If they haven't
519 been compiled, Guile will auto-compile them. The important thing to keep
520 in mind is that there's a >= 100x speed difference between compiled and
521 non-compiled files. */
522 return scm_c_primitive_load ((const char *) boot_scm_file
);
525 /* Return non-zero if ARGS has the "standard" format for throw args.
526 The standard format is:
527 (function format-string (format-string-args-list) ...).
528 FUNCTION is #f if no function was recorded. */
531 standard_throw_args_p (SCM args
)
533 if (gdbscm_is_true (scm_list_p (args
))
534 && scm_ilength (args
) >= 3)
536 /* The function in which the error occurred. */
537 SCM arg0
= scm_list_ref (args
, scm_from_int (0));
538 /* The format string. */
539 SCM arg1
= scm_list_ref (args
, scm_from_int (1));
540 /* The arguments of the format string. */
541 SCM arg2
= scm_list_ref (args
, scm_from_int (2));
543 if ((scm_is_string (arg0
) || gdbscm_is_false (arg0
))
544 && scm_is_string (arg1
)
545 && gdbscm_is_true (scm_list_p (arg2
)))
552 /* Print the error recorded in a "standard" throw args. */
555 print_standard_throw_error (SCM args
)
557 /* The function in which the error occurred. */
558 SCM arg0
= scm_list_ref (args
, scm_from_int (0));
559 /* The format string. */
560 SCM arg1
= scm_list_ref (args
, scm_from_int (1));
561 /* The arguments of the format string. */
562 SCM arg2
= scm_list_ref (args
, scm_from_int (2));
564 /* ARG0 is #f if no function was recorded. */
565 if (gdbscm_is_true (arg0
))
567 scm_simple_format (scm_current_error_port (),
568 scm_from_latin1_string (_("Error in function ~s:~%")),
571 scm_simple_format (scm_current_error_port (), arg1
, arg2
);
574 /* Print the error message recorded in KEY, ARGS, the arguments to throw.
575 Normally we let Scheme print the error message.
576 This function is used when Scheme initialization fails.
577 We can still use the Scheme C API though. */
580 print_throw_error (SCM key
, SCM args
)
582 /* IWBN to call gdbscm_print_exception_with_stack here, but Guile didn't
583 boot successfully so play it safe and avoid it. The "format string" and
584 its args are embedded in ARGS, but the content of ARGS depends on KEY.
585 Make sure ARGS has the expected canonical content before trying to use
587 if (standard_throw_args_p (args
))
588 print_standard_throw_error (args
);
591 scm_simple_format (scm_current_error_port (),
592 scm_from_latin1_string (_("Throw to key `~a' with args `~s'.~%")),
593 scm_list_2 (key
, args
));
597 /* Handle an exception thrown while loading BOOT_SCM_FILE. */
600 handle_boot_error (void *boot_scm_file
, SCM key
, SCM args
)
602 fprintf_unfiltered (gdb_stderr
, ("Exception caught while booting Guile.\n"));
604 print_throw_error (key
, args
);
606 fprintf_unfiltered (gdb_stderr
, "\n");
607 warning (_("Could not complete Guile gdb module initialization from:\n"
609 "Limited Guile support is available.\n"
610 "Suggest passing --data-directory=/path/to/gdb/data-directory.\n"),
611 (const char *) boot_scm_file
);
613 return SCM_UNSPECIFIED
;
616 /* Load gdb/boot.scm, the Scheme side of GDB/Guile support.
617 Note: This function assumes it's called within the gdb module. */
620 initialize_scheme_side (void)
625 guile_datadir
= concat (gdb_datadir
, SLASH_STRING
, "guile", (char *) NULL
);
626 boot_scm_path
= concat (guile_datadir
, SLASH_STRING
, "gdb",
627 SLASH_STRING
, boot_scm_filename
, (char *) NULL
);
629 scm_c_catch (SCM_BOOL_T
, boot_guile_support
, boot_scm_path
,
630 handle_boot_error
, boot_scm_path
, NULL
, NULL
);
632 xfree (boot_scm_path
);
635 /* Install the gdb scheme module.
636 The result is a boolean indicating success.
637 If initializing the gdb module fails an error message is printed.
638 Note: This function runs in the context of the gdb module. */
641 initialize_gdb_module (void *data
)
643 /* Computing these is a pain, so only do it once.
644 Also, do it here and save the result so that obtaining the values
646 gdbscm_guile_major_version
= gdbscm_scm_string_to_int (scm_major_version ());
647 gdbscm_guile_minor_version
= gdbscm_scm_string_to_int (scm_minor_version ());
648 gdbscm_guile_micro_version
= gdbscm_scm_string_to_int (scm_micro_version ());
650 /* The documentation symbol needs to be defined before any calls to
651 gdbscm_define_{variables,functions}. */
652 gdbscm_documentation_symbol
= scm_from_latin1_symbol ("documentation");
654 /* The smob and exception support must be initialized early. */
655 gdbscm_initialize_smobs ();
656 gdbscm_initialize_exceptions ();
658 /* The rest are initialized in alphabetical order. */
659 gdbscm_initialize_arches ();
660 gdbscm_initialize_auto_load ();
661 gdbscm_initialize_blocks ();
662 gdbscm_initialize_breakpoints ();
663 gdbscm_initialize_commands ();
664 gdbscm_initialize_disasm ();
665 gdbscm_initialize_frames ();
666 gdbscm_initialize_iterators ();
667 gdbscm_initialize_lazy_strings ();
668 gdbscm_initialize_math ();
669 gdbscm_initialize_objfiles ();
670 gdbscm_initialize_parameters ();
671 gdbscm_initialize_ports ();
672 gdbscm_initialize_pretty_printers ();
673 gdbscm_initialize_pspaces ();
674 gdbscm_initialize_strings ();
675 gdbscm_initialize_symbols ();
676 gdbscm_initialize_symtabs ();
677 gdbscm_initialize_types ();
678 gdbscm_initialize_values ();
680 gdbscm_define_functions (misc_guile_functions
, 1);
682 from_tty_keyword
= scm_from_latin1_keyword ("from-tty");
683 to_string_keyword
= scm_from_latin1_keyword ("to-string");
685 initialize_scheme_side ();
687 gdb_scheme_initialized
= 1;
690 /* Utility to call scm_c_define_module+initialize_gdb_module from
691 within scm_with_guile. */
694 call_initialize_gdb_module (void *data
)
696 /* Most of the initialization is done by initialize_gdb_module.
697 It is called via scm_c_define_module so that the initialization is
698 performed within the desired module. */
699 scm_c_define_module (gdbscm_module_name
, initialize_gdb_module
, NULL
);
701 #if HAVE_GUILE_MANUAL_FINALIZATION
702 scm_run_finalizers ();
708 /* A callback to finish Guile initialization after gdb has finished all its
710 This is the extension_language_ops.finish_initialization "method". */
713 gdbscm_finish_initialization (const struct extension_language_defn
*extlang
)
715 /* Restore the environment to the user interaction one. */
716 scm_set_current_module (scm_interaction_environment ());
719 /* The extension_language_ops.initialized "method". */
722 gdbscm_initialized (const struct extension_language_defn
*extlang
)
724 return gdb_scheme_initialized
;
727 /* Enable or disable Guile backtraces. */
730 gdbscm_set_backtrace (int enable
)
732 static const char disable_bt
[] = "(debug-disable 'backtrace)";
733 static const char enable_bt
[] = "(debug-enable 'backtrace)";
736 gdbscm_safe_eval_string (enable_bt
, 0);
738 gdbscm_safe_eval_string (disable_bt
, 0);
741 #endif /* HAVE_GUILE */
743 /* Install the various gdb commands used by Guile. */
746 install_gdb_commands (void)
748 add_com ("guile-repl", class_obscure
,
752 Start an interactive Guile prompt.\n\
754 To return to GDB, type the EOF character (e.g., Ctrl-D on an empty\n\
756 #else /* HAVE_GUILE */
758 Start a Guile interactive prompt.\n\
760 Guile scripting is not supported in this copy of GDB.\n\
761 This command is only a placeholder.")
762 #endif /* HAVE_GUILE */
764 add_com_alias ("gr", "guile-repl", class_obscure
, 1);
766 /* Since "help guile" is easy to type, and intuitive, we add general help
767 in using GDB+Guile to this command. */
768 add_com ("guile", class_obscure
, guile_command
,
771 Evaluate one or more Guile expressions.\n\
773 The expression(s) can be given as an argument, for instance:\n\
775 guile (display 23)\n\
777 The result of evaluating the last expression is printed.\n\
779 If no argument is given, the following lines are read and passed\n\
780 to Guile for evaluation. Type a line containing \"end\" to indicate\n\
781 the end of the set of expressions.\n\
783 The Guile GDB module must first be imported before it can be used.\n\
785 (gdb) guile (use-modules (gdb))\n\
786 or if you want to import the (gdb) module with a prefix, use:\n\
787 (gdb) guile (use-modules ((gdb) #:renamer (symbol-prefix-proc 'gdb:)))\n\
789 The Guile interactive session, started with the \"guile-repl\"\n\
790 command, provides extensive help and apropos capabilities.\n\
791 Type \",help\" once in a Guile interactive session.")
792 #else /* HAVE_GUILE */
794 Evaluate a Guile expression.\n\
796 Guile scripting is not supported in this copy of GDB.\n\
797 This command is only a placeholder.")
798 #endif /* HAVE_GUILE */
800 add_com_alias ("gu", "guile", class_obscure
, 1);
802 add_prefix_cmd ("guile", class_obscure
, set_guile_command
,
803 _("Prefix command for Guile preference settings."),
804 &set_guile_list
, "set guile ", 0,
806 add_alias_cmd ("gu", "guile", class_obscure
, 1, &setlist
);
808 add_prefix_cmd ("guile", class_obscure
, show_guile_command
,
809 _("Prefix command for Guile preference settings."),
810 &show_guile_list
, "show guile ", 0,
812 add_alias_cmd ("gu", "guile", class_obscure
, 1, &showlist
);
814 add_prefix_cmd ("guile", class_obscure
, info_guile_command
,
815 _("Prefix command for Guile info displays."),
816 &info_guile_list
, "info guile ", 0,
818 add_info_alias ("gu", "guile", 1);
820 /* The name "print-stack" is carried over from Python.
821 A better name is "print-exception". */
822 add_setshow_enum_cmd ("print-stack", no_class
, guile_print_excp_enums
,
823 &gdbscm_print_excp
, _("\
824 Set mode for Guile exception printing on error."), _("\
825 Show the mode of Guile exception printing on error."), _("\
826 none == no stack or message will be printed.\n\
827 full == a message and a stack will be printed.\n\
828 message == an error message without a stack will be printed."),
830 &set_guile_list
, &show_guile_list
);
833 /* Provide a prototype to silence -Wmissing-prototypes. */
834 extern initialize_file_ftype _initialize_guile
;
837 _initialize_guile (void)
839 install_gdb_commands ();
843 #ifdef HAVE_SIGPROCMASK
844 sigset_t sigchld_mask
, prev_mask
;
847 /* The Python support puts the C side in module "_gdb", leaving the Python
848 side to define module "gdb" which imports "_gdb". There is evidently no
849 similar convention in Guile so we skip this. */
851 #if HAVE_GUILE_MANUAL_FINALIZATION
852 /* Our SMOB free functions are not thread-safe, as GDB itself is not
853 intended to be thread-safe. Disable automatic finalization so that
854 finalizers aren't run in other threads. */
855 scm_set_automatic_finalization_enabled (0);
858 #ifdef HAVE_SIGPROCMASK
859 /* Before we initialize Guile, block SIGCHLD.
860 This is done so that all threads created during Guile initialization
861 have SIGCHLD blocked. PR 17247.
862 Really libgc and Guile should do this, but we need to work with
864 sigemptyset (&sigchld_mask
);
865 sigaddset (&sigchld_mask
, SIGCHLD
);
866 sigprocmask (SIG_BLOCK
, &sigchld_mask
, &prev_mask
);
869 /* scm_with_guile is the most portable way to initialize Guile.
870 Plus we need to initialize the Guile support while in Guile mode
871 (e.g., called from within a call to scm_with_guile). */
872 scm_with_guile (call_initialize_gdb_module
, NULL
);
874 #ifdef HAVE_SIGPROCMASK
875 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
878 /* Set Guile's backtrace to match the "set guile print-stack" default.
879 [N.B. The two settings are still separate.]
880 But only do this after we've initialized Guile, it's nice to see a
881 backtrace if there's an error during initialization.
882 OTOH, if the error is that gdb/init.scm wasn't found because gdb is
883 being run from the build tree, the backtrace is more noise than signal.
885 gdbscm_set_backtrace (0);