1 /* Interface between gdb and its extension languages.
3 Copyright (C) 2014 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 /* Note: With few exceptions, external functions and variables in this file
21 have "ext_lang" in the name, and no other symbol in gdb does. */
25 #include "auto-load.h"
26 #include "breakpoint.h"
27 #include "event-top.h"
28 #include "extension.h"
29 #include "extension-priv.h"
31 #include "cli/cli-script.h"
32 #include "python/python.h"
34 /* Iterate over all external extension languages, regardless of whether the
35 support has been compiled in or not.
36 This does not include GDB's own scripting language. */
38 #define ALL_EXTENSION_LANGUAGES(i, extlang) \
39 for (/*int*/ i = 0, extlang = extension_languages[0]; \
41 extlang = extension_languages[++i])
43 /* Iterate over all external extension languages that are supported.
44 This does not include GDB's own scripting language. */
46 #define ALL_ENABLED_EXTENSION_LANGUAGES(i, extlang) \
47 for (/*int*/ i = 0, extlang = extension_languages[0]; \
49 extlang = extension_languages[++i]) \
50 if (extlang->ops != NULL)
52 static script_sourcer_func source_gdb_script
;
53 static objfile_script_sourcer_func source_gdb_objfile_script
;
55 /* GDB's own scripting language.
56 This exists, in part, to support auto-loading ${prog}-gdb.gdb scripts. */
58 static const struct extension_language_script_ops
59 extension_language_gdb_script_ops
=
62 source_gdb_objfile_script
,
63 auto_load_gdb_scripts_enabled
66 const struct extension_language_defn extension_language_gdb
=
72 /* We fall back to interpreting a script as a GDB script if it doesn't
73 match the other scripting languages, but for consistency's sake
74 give it a formal suffix. */
78 /* cli_control_type: This is never used: GDB's own scripting language
79 has a variety of control types (if, while, etc.). */
82 &extension_language_gdb_script_ops
,
84 /* The rest of the extension language interface isn't supported by GDB's own
85 extension/scripting language. */
89 /* NULL-terminated table of all external (non-native) extension languages.
91 The order of appearance in the table is important.
92 When multiple extension languages provide the same feature, for example
93 a pretty-printer for a particular type, which one gets used?
94 The algorithm employed here is "the first one wins". For example, in
95 the case of pretty-printers this means the first one to provide a
96 pretty-printed value is the one that is used. This algorithm is employed
99 static const struct extension_language_defn
* const extension_languages
[] =
101 /* To preserve existing behaviour, python should always appear first. */
102 &extension_language_python
,
106 /* Return a pointer to the struct extension_language_defn object of
107 extension language LANG.
108 This always returns a non-NULL pointer, even if support for the language
109 is not compiled into this copy of GDB. */
111 const struct extension_language_defn
*
112 get_ext_lang_defn (enum extension_language lang
)
115 const struct extension_language_defn
*extlang
;
117 gdb_assert (lang
!= EXT_LANG_NONE
);
119 if (lang
== EXT_LANG_GDB
)
120 return &extension_language_gdb
;
122 ALL_EXTENSION_LANGUAGES (i
, extlang
)
124 if (extlang
->language
== lang
)
128 gdb_assert_not_reached ("unable to find extension_language_defn");
131 /* Return TRUE if FILE has extension EXTENSION. */
134 has_extension (const char *file
, const char *extension
)
136 int file_len
= strlen (file
);
137 int extension_len
= strlen (extension
);
139 return (file_len
> extension_len
140 && strcmp (&file
[file_len
- extension_len
], extension
) == 0);
143 /* Return the extension language of FILE, or NULL if
144 the extension language of FILE is not recognized.
145 This is done by looking at the file's suffix. */
147 const struct extension_language_defn
*
148 get_ext_lang_of_file (const char *file
)
151 const struct extension_language_defn
*extlang
;
153 ALL_EXTENSION_LANGUAGES (i
, extlang
)
155 if (has_extension (file
, extlang
->suffix
))
162 /* Return non-zero if support for the specified extension language
166 ext_lang_present_p (const struct extension_language_defn
*extlang
)
168 return extlang
->script_ops
!= NULL
;
171 /* Return non-zero if the specified extension language has successfully
175 ext_lang_initialized_p (const struct extension_language_defn
*extlang
)
177 if (extlang
->ops
!= NULL
)
179 /* This method is required. */
180 gdb_assert (extlang
->ops
->initialized
!= NULL
);
181 return extlang
->ops
->initialized (extlang
);
187 /* Throw an error indicating EXTLANG is not supported in this copy of GDB. */
190 throw_ext_lang_unsupported (const struct extension_language_defn
*extlang
)
192 error (_("Scripting in the \"%s\" language is not supported"
193 " in this copy of GDB."),
194 ext_lang_capitalized_name (extlang
));
197 /* Methods for GDB's own extension/scripting language. */
199 /* The extension_language_script_ops.script_sourcer "method". */
202 source_gdb_script (const struct extension_language_defn
*extlang
,
203 FILE *stream
, const char *file
)
205 script_from_file (stream
, file
);
208 /* The extension_language_script_ops.objfile_script_sourcer "method". */
211 source_gdb_objfile_script (const struct extension_language_defn
*extlang
,
212 struct objfile
*objfile
,
213 FILE *stream
, const char *file
)
215 script_from_file (stream
, file
);
218 /* Accessors for "public" attributes of struct extension_language. */
220 /* Return the "name" field of EXTLANG. */
223 ext_lang_name (const struct extension_language_defn
*extlang
)
225 return extlang
->name
;
228 /* Return the "capitalized_name" field of EXTLANG. */
231 ext_lang_capitalized_name (const struct extension_language_defn
*extlang
)
233 return extlang
->capitalized_name
;
236 /* Return the "suffix" field of EXTLANG. */
239 ext_lang_suffix (const struct extension_language_defn
*extlang
)
241 return extlang
->suffix
;
244 /* Return the "auto_load_suffix" field of EXTLANG. */
247 ext_lang_auto_load_suffix (const struct extension_language_defn
*extlang
)
249 return extlang
->auto_load_suffix
;
252 /* extension_language_script_ops wrappers. */
254 /* Return the script "sourcer" function for EXTLANG.
255 This is the function that loads and processes a script.
256 If support for this language isn't compiled in, NULL is returned. */
258 script_sourcer_func
*
259 ext_lang_script_sourcer (const struct extension_language_defn
*extlang
)
261 if (extlang
->script_ops
== NULL
)
264 /* The extension language is required to implement this function. */
265 gdb_assert (extlang
->script_ops
->script_sourcer
!= NULL
);
267 return extlang
->script_ops
->script_sourcer
;
270 /* Return the objfile script "sourcer" function for EXTLANG.
271 This is the function that loads and processes a script for a particular
273 If support for this language isn't compiled in, NULL is returned. */
275 objfile_script_sourcer_func
*
276 ext_lang_objfile_script_sourcer (const struct extension_language_defn
*extlang
)
278 if (extlang
->script_ops
== NULL
)
281 /* The extension language is required to implement this function. */
282 gdb_assert (extlang
->script_ops
->objfile_script_sourcer
!= NULL
);
284 return extlang
->script_ops
->objfile_script_sourcer
;
287 /* Return non-zero if auto-loading of EXTLANG scripts is enabled.
288 Zero is returned if support for this language isn't compiled in. */
291 ext_lang_auto_load_enabled (const struct extension_language_defn
*extlang
)
293 if (extlang
->script_ops
== NULL
)
296 /* The extension language is required to implement this function. */
297 gdb_assert (extlang
->script_ops
->auto_load_enabled
!= NULL
);
299 return extlang
->script_ops
->auto_load_enabled (extlang
);
302 /* Functions that iterate over all extension languages.
303 These only iterate over external extension languages, not including
304 GDB's own extension/scripting language, unless otherwise indicated. */
306 /* Wrapper to call the extension_language_ops.finish_initialization "method"
307 for each compiled-in extension language. */
310 finish_ext_lang_initialization (void)
313 const struct extension_language_defn
*extlang
;
315 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
317 if (extlang
->ops
->finish_initialization
!= NULL
)
318 extlang
->ops
->finish_initialization (extlang
);
322 /* Invoke the appropriate extension_language_ops.eval_from_control_command
323 method to perform CMD, which is a list of commands in an extension language.
325 This function is what implements, for example:
334 eval_ext_lang_from_control_command (struct command_line
*cmd
)
337 const struct extension_language_defn
*extlang
;
339 ALL_EXTENSION_LANGUAGES (i
, extlang
)
341 if (extlang
->cli_control_type
== cmd
->control_type
)
343 if (extlang
->ops
->eval_from_control_command
!= NULL
)
345 extlang
->ops
->eval_from_control_command (extlang
, cmd
);
348 /* The requested extension language is not supported in this GDB. */
349 throw_ext_lang_unsupported (extlang
);
353 gdb_assert_not_reached ("unknown extension language in command_line");
356 /* Search for and load scripts for OBJFILE written in extension languages.
357 This includes GDB's own scripting language.
359 This function is what implements the loading of OBJFILE-gdb.py and
363 auto_load_ext_lang_scripts_for_objfile (struct objfile
*objfile
)
366 const struct extension_language_defn
*extlang
;
368 extlang
= &extension_language_gdb
;
369 if (ext_lang_auto_load_enabled (extlang
))
370 auto_load_objfile_script (objfile
, extlang
);
372 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
374 if (ext_lang_auto_load_enabled (extlang
))
375 auto_load_objfile_script (objfile
, extlang
);
379 /* Interface to type pretty-printers implemented in an extension language. */
381 /* Call this at the start when preparing to pretty-print a type.
382 The result is a pointer to an opaque object (to the caller) to be passed
383 to apply_ext_lang_type_printers and free_ext_lang_type_printers.
385 We don't know in advance which extension language will provide a
386 pretty-printer for the type, so all are initialized. */
388 struct ext_lang_type_printers
*
389 start_ext_lang_type_printers (void)
391 struct ext_lang_type_printers
*printers
392 = XCNEW (struct ext_lang_type_printers
);
394 const struct extension_language_defn
*extlang
;
396 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
398 if (extlang
->ops
->start_type_printers
!= NULL
)
399 extlang
->ops
->start_type_printers (extlang
, printers
);
405 /* Iteratively try the type pretty-printers specified by PRINTERS
406 according to the standard search order (specified by extension_languages),
407 returning the result of the first one that succeeds.
408 If there was an error, or if no printer succeeds, then NULL is returned. */
411 apply_ext_lang_type_printers (struct ext_lang_type_printers
*printers
,
415 const struct extension_language_defn
*extlang
;
417 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
422 if (extlang
->ops
->apply_type_printers
== NULL
)
424 rc
= extlang
->ops
->apply_type_printers (extlang
, printers
, type
,
429 gdb_assert (result
!= NULL
);
431 case EXT_LANG_RC_ERROR
:
433 case EXT_LANG_RC_NOP
:
436 gdb_assert_not_reached ("bad return from apply_type_printers");
443 /* Call this after pretty-printing a type to release all memory held
447 free_ext_lang_type_printers (struct ext_lang_type_printers
*printers
)
450 const struct extension_language_defn
*extlang
;
452 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
454 if (extlang
->ops
->free_type_printers
!= NULL
)
455 extlang
->ops
->free_type_printers (extlang
, printers
);
461 /* Try to pretty-print a value of type TYPE located at VALADDR
462 + EMBEDDED_OFFSET, which came from the inferior at address ADDRESS
463 + EMBEDDED_OFFSET, onto stdio stream STREAM according to OPTIONS.
464 VAL is the whole object that came from ADDRESS. VALADDR must point to
465 the head of VAL's contents buffer.
466 Returns non-zero if the value was successfully pretty-printed.
468 Extension languages are tried in the order specified by
469 extension_languages. The first one to provide a pretty-printed
472 If an error is encountered in a pretty-printer, no further extension
474 Note: This is different than encountering a memory error trying to read a
475 value for pretty-printing. Here we're referring to, e.g., programming
476 errors that trigger an exception in the extension language. */
479 apply_ext_lang_val_pretty_printer (struct type
*type
, const gdb_byte
*valaddr
,
480 int embedded_offset
, CORE_ADDR address
,
481 struct ui_file
*stream
, int recurse
,
482 const struct value
*val
,
483 const struct value_print_options
*options
,
484 const struct language_defn
*language
)
487 const struct extension_language_defn
*extlang
;
489 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
493 if (extlang
->ops
->apply_val_pretty_printer
== NULL
)
495 rc
= extlang
->ops
->apply_val_pretty_printer (extlang
, type
, valaddr
,
496 embedded_offset
, address
,
497 stream
, recurse
, val
,
503 case EXT_LANG_RC_ERROR
:
505 case EXT_LANG_RC_NOP
:
508 gdb_assert_not_reached ("bad return from apply_val_pretty_printer");
515 /* GDB access to the "frame filter" feature.
516 FRAME is the source frame to start frame-filter invocation. FLAGS is an
517 integer holding the flags for printing. The following elements of
518 the FRAME_FILTER_FLAGS enum denotes the make-up of FLAGS:
519 PRINT_LEVEL is a flag indicating whether to print the frame's
520 relative level in the output. PRINT_FRAME_INFO is a flag that
521 indicates whether this function should print the frame
522 information, PRINT_ARGS is a flag that indicates whether to print
523 frame arguments, and PRINT_LOCALS, likewise, with frame local
524 variables. ARGS_TYPE is an enumerator describing the argument
525 format, OUT is the output stream to print. FRAME_LOW is the
526 beginning of the slice of frames to print, and FRAME_HIGH is the
527 upper limit of the frames to count. Returns EXT_LANG_BT_ERROR on error,
528 or EXT_LANG_BT_COMPLETED on success.
530 Extension languages are tried in the order specified by
531 extension_languages. The first one to provide a filter "wins".
532 If there is an error (EXT_LANG_BT_ERROR) it is reported immediately
533 rather than trying filters in other extension languages. */
535 enum ext_lang_bt_status
536 apply_ext_lang_frame_filter (struct frame_info
*frame
, int flags
,
537 enum ext_lang_frame_args args_type
,
539 int frame_low
, int frame_high
)
542 const struct extension_language_defn
*extlang
;
544 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
546 enum ext_lang_bt_status status
;
548 if (extlang
->ops
->apply_frame_filter
== NULL
)
550 status
= extlang
->ops
->apply_frame_filter (extlang
, frame
, flags
,
552 frame_low
, frame_high
);
553 /* We use the filters from the first extension language that has
554 applicable filters. Also, an error is reported immediately
555 rather than continue trying. */
556 if (status
!= EXT_LANG_BT_NO_FILTERS
)
560 return EXT_LANG_BT_NO_FILTERS
;
563 /* Update values held by the extension language when OBJFILE is discarded.
564 New global types must be created for every such value, which must then be
565 updated to use the new types.
566 The function typically just iterates over all appropriate values and
567 calls preserve_one_value for each one.
568 COPIED_TYPES is used to prevent cycles / duplicates and is passed to
569 preserve_one_value. */
572 preserve_ext_lang_values (struct objfile
*objfile
, htab_t copied_types
)
575 const struct extension_language_defn
*extlang
;
577 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
579 if (extlang
->ops
->preserve_values
!= NULL
)
580 extlang
->ops
->preserve_values (extlang
, objfile
, copied_types
);
584 /* If there is a stop condition implemented in an extension language for
585 breakpoint B, return a pointer to the extension language's definition.
586 Otherwise return NULL.
587 If SKIP_LANG is not EXT_LANG_NONE, skip checking this language.
588 This is for the case where we're setting a new condition: Only one
589 condition is allowed, so when setting a condition for any particular
590 extension language, we need to check if any other extension language
591 already has a condition set. */
593 const struct extension_language_defn
*
594 get_breakpoint_cond_ext_lang (struct breakpoint
*b
,
595 enum extension_language skip_lang
)
598 const struct extension_language_defn
*extlang
;
600 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
602 if (extlang
->language
!= skip_lang
603 && extlang
->ops
->breakpoint_has_cond
!= NULL
604 && extlang
->ops
->breakpoint_has_cond (extlang
, b
))
611 /* Return whether a stop condition for breakpoint B says to stop.
612 True is also returned if there is no stop condition for B. */
615 breakpoint_ext_lang_cond_says_stop (struct breakpoint
*b
)
618 const struct extension_language_defn
*extlang
;
619 enum ext_lang_bp_stop stop
= EXT_LANG_BP_STOP_UNSET
;
621 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
623 /* There is a rule that a breakpoint can have at most one of any of a
624 CLI or extension language condition. However, Python hacks in "finish
625 breakpoints" on top of the "stop" check, so we have to call this for
626 every language, even if we could first determine whether a "stop"
628 if (extlang
->ops
->breakpoint_cond_says_stop
!= NULL
)
630 enum ext_lang_bp_stop this_stop
631 = extlang
->ops
->breakpoint_cond_says_stop (extlang
, b
);
633 if (this_stop
!= EXT_LANG_BP_STOP_UNSET
)
635 /* Even though we have to check every extension language, only
636 one of them can return yes/no (because only one of them
637 can have a "stop" condition). */
638 gdb_assert (stop
== EXT_LANG_BP_STOP_UNSET
);
644 return stop
== EXT_LANG_BP_STOP_NO
? 0 : 1;
647 /* ^C/SIGINT support.
648 This requires cooperation with the extension languages so the support
651 /* This flag tracks quit requests when we haven't called out to an
652 extension language. it also holds quit requests when we transition to
653 an extension language that doesn't have cooperative SIGINT handling. */
654 static int quit_flag
;
656 /* The current extension language we've called out to, or
657 extension_language_gdb if there isn't one.
658 This must be set everytime we call out to an extension language, and reset
659 to the previous value when it returns. Note that the previous value may
660 be a different (or the same) extension language. */
661 static const struct extension_language_defn
*active_ext_lang
662 = &extension_language_gdb
;
664 /* Return the currently active extension language. */
666 const struct extension_language_defn
*
667 get_active_ext_lang (void)
669 return active_ext_lang
;
672 /* Install a SIGINT handler. */
675 install_sigint_handler (const struct signal_handler
*handler_state
)
677 gdb_assert (handler_state
->handler_saved
);
679 signal (SIGINT
, handler_state
->handler
);
682 /* Install GDB's SIGINT handler, storing the previous version in *PREVIOUS.
683 As a simple optimization, if the previous version was GDB's SIGINT handler
684 then mark the previous handler as not having been saved, and thus it won't
688 install_gdb_sigint_handler (struct signal_handler
*previous
)
690 /* Save here to simplify comparison. */
691 RETSIGTYPE (*handle_sigint_for_compare
) () = handle_sigint
;
693 previous
->handler
= signal (SIGINT
, handle_sigint
);
694 if (previous
->handler
!= handle_sigint_for_compare
)
695 previous
->handler_saved
= 1;
697 previous
->handler_saved
= 0;
700 /* Set the currently active extension language to NOW_ACTIVE.
701 The result is a pointer to a malloc'd block of memory to pass to
702 restore_active_ext_lang.
704 N.B. This function must be called every time we call out to an extension
705 language, and the result must be passed to restore_active_ext_lang
708 If there is a pending SIGINT it is "moved" to the now active extension
709 language, if it supports cooperative SIGINT handling (i.e., it provides
710 {clear,set,check}_quit_flag methods). If the extension language does not
711 support cooperative SIGINT handling, then the SIGINT is left queued and
712 we require the non-cooperative extension language to call check_quit_flag
713 at appropriate times.
714 It is important for the extension language to call check_quit_flag if it
715 installs its own SIGINT handler to prevent the situation where a SIGINT
716 is queued on entry, extension language code runs for a "long" time possibly
717 serving one or more SIGINTs, and then returns. Upon return, if
718 check_quit_flag is not called, the original SIGINT will be thrown.
719 Non-cooperative extension languages are free to install their own SIGINT
720 handler but the original must be restored upon return, either itself
721 or via restore_active_ext_lang. */
723 struct active_ext_lang_state
*
724 set_active_ext_lang (const struct extension_language_defn
*now_active
)
726 struct active_ext_lang_state
*previous
727 = XCNEW (struct active_ext_lang_state
);
729 previous
->ext_lang
= active_ext_lang
;
730 active_ext_lang
= now_active
;
732 /* If the newly active extension language uses cooperative SIGINT handling
733 then ensure GDB's SIGINT handler is installed. */
734 if (now_active
->language
== EXT_LANG_GDB
735 || now_active
->ops
->check_quit_flag
!= NULL
)
736 install_gdb_sigint_handler (&previous
->sigint_handler
);
738 /* If there's a SIGINT recorded in the cooperative extension languages,
739 move it to the new language, or save it in GDB's global flag if the newly
740 active extension language doesn't use cooperative SIGINT handling. */
741 if (check_quit_flag ())
747 /* Restore active extension language from PREVIOUS. */
750 restore_active_ext_lang (struct active_ext_lang_state
*previous
)
752 const struct extension_language_defn
*current
= active_ext_lang
;
754 active_ext_lang
= previous
->ext_lang
;
756 /* Restore the previous SIGINT handler if one was saved. */
757 if (previous
->sigint_handler
.handler_saved
)
758 install_sigint_handler (&previous
->sigint_handler
);
760 /* If there's a SIGINT recorded in the cooperative extension languages,
761 move it to the new language, or save it in GDB's global flag if the newly
762 active extension language doesn't use cooperative SIGINT handling. */
763 if (check_quit_flag ())
769 /* Clear the quit flag.
770 The flag is cleared in all extension languages,
771 not just the currently active one. */
774 clear_quit_flag (void)
777 const struct extension_language_defn
*extlang
;
779 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
781 if (extlang
->ops
->clear_quit_flag
!= NULL
)
782 extlang
->ops
->clear_quit_flag (extlang
);
788 /* Set the quit flag.
789 This only sets the flag in the currently active extension language.
790 If the currently active extension language does not have cooperative
791 SIGINT handling, then GDB's global flag is set, and it is up to the
792 extension language to call check_quit_flag. The extension language
793 is free to install its own SIGINT handler, but we still need to handle
799 if (active_ext_lang
->ops
!= NULL
800 && active_ext_lang
->ops
->set_quit_flag
!= NULL
)
801 active_ext_lang
->ops
->set_quit_flag (active_ext_lang
);
806 /* Return true if the quit flag has been set, false otherwise.
807 Note: The flag is cleared as a side-effect.
808 The flag is checked in all extension languages that support cooperative
809 SIGINT handling, not just the current one. This simplifies transitions. */
812 check_quit_flag (void)
815 const struct extension_language_defn
*extlang
;
817 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
819 if (extlang
->ops
->check_quit_flag
!= NULL
)
820 if (extlang
->ops
->check_quit_flag (extlang
) != 0)
824 /* This is written in a particular way to avoid races. */
834 /* Called via an observer before gdb prints its prompt.
835 Iterate over the extension languages giving them a chance to
836 change the prompt. The first one to change the prompt wins,
837 and no further languages are tried. */
840 ext_lang_before_prompt (const char *current_gdb_prompt
)
843 const struct extension_language_defn
*extlang
;
845 ALL_ENABLED_EXTENSION_LANGUAGES (i
, extlang
)
849 if (extlang
->ops
->before_prompt
== NULL
)
851 rc
= extlang
->ops
->before_prompt (extlang
, current_gdb_prompt
);
855 case EXT_LANG_RC_ERROR
:
857 case EXT_LANG_RC_NOP
:
860 gdb_assert_not_reached ("bad return from before_prompt");
865 extern initialize_file_ftype _initialize_extension
;
868 _initialize_extension (void)
870 observer_attach_before_prompt (ext_lang_before_prompt
);