1 /* GDB parameters implemented in Guile.
3 Copyright (C) 2008-2015 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/>. */
24 #include "cli/cli-decode.h"
25 #include "completer.h"
27 #include "arch-utils.h"
28 #include "guile-internal.h"
30 /* A union that can hold anything described by enum var_types. */
34 /* Hold an integer value, for boolean and integer types. */
37 /* Hold an auto_boolean. */
38 enum auto_boolean autoboolval;
40 /* Hold an unsigned integer value, for uinteger. */
43 /* Hold a string, for the various string types. */
46 /* Hold a string, for enums. */
47 const char *cstringval;
52 Note: Parameters are added to gdb using a two step process:
53 1) Call make-parameter to create a <gdb:parameter> object.
54 2) Call register-parameter! to add the parameter to gdb.
55 It is done this way so that the constructor, make-parameter, doesn't have
56 any side-effects. This means that the smob needs to store everything
57 that was passed to make-parameter.
59 N.B. There is no free function for this smob.
60 All objects pointed to by this smob must live in GC space. */
62 typedef struct _param_smob
64 /* This always appears first. */
67 /* The parameter name. */
70 /* The last word of the command.
71 This is needed because add_cmd requires us to allocate space
75 /* One of the COMMAND_* constants. */
76 enum command_class cmd_class;
78 /* The type of the parameter. */
81 /* The docs for the parameter. */
86 /* The corresponding gdb command objects.
87 These are NULL if the parameter has not been registered yet, or
88 is no longer registered. */
89 struct cmd_list_element *set_command;
90 struct cmd_list_element *show_command;
92 /* The value of the parameter. */
93 union pascm_variable value;
95 /* For an enum parameter, the possible values. The vector lives in GC
96 space, it will be freed with the smob. */
97 const char * const *enumeration;
99 /* The set_func funcion or #f if not specified.
100 This function is called *after* the parameter is set.
101 It returns a string that will be displayed to the user. */
104 /* The show_func function or #f if not specified.
105 This function returns the string that is printed. */
108 /* The <gdb:parameter> object we are contained in, needed to
109 protect/unprotect the object since a reference to it comes from
110 non-gc-managed space (the command context pointer). */
114 static const char param_smob_name[] = "gdb:parameter";
116 /* The tag Guile knows the param smob by. */
117 static scm_t_bits parameter_smob_tag;
119 /* Keywords used by make-parameter!. */
120 static SCM command_class_keyword;
121 static SCM parameter_type_keyword;
122 static SCM enum_list_keyword;
123 static SCM set_func_keyword;
124 static SCM show_func_keyword;
125 static SCM doc_keyword;
126 static SCM set_doc_keyword;
127 static SCM show_doc_keyword;
128 static SCM initial_value_keyword;
129 static SCM auto_keyword;
130 static SCM unlimited_keyword;
132 static int pascm_is_valid (param_smob *);
133 static const char *pascm_param_type_name (enum var_types type);
134 static SCM pascm_param_value (enum var_types type, void *var,
135 int arg_pos, const char *func_name);
137 /* Administrivia for parameter smobs. */
140 pascm_print_param_smob (SCM self, SCM port, scm_print_state *pstate)
142 param_smob *p_smob = (param_smob *) SCM_SMOB_DATA (self);
145 gdbscm_printf (port, "#<%s", param_smob_name);
147 gdbscm_printf (port, " %s", p_smob->name);
149 if (! pascm_is_valid (p_smob))
150 scm_puts (" {invalid}", port);
152 gdbscm_printf (port, " %s ", pascm_param_type_name (p_smob->type));
154 value = pascm_param_value (p_smob->type, &p_smob->value,
155 GDBSCM_ARG_NONE, NULL);
156 scm_display (value, port);
158 scm_puts (">", port);
160 scm_remember_upto_here_1 (self);
162 /* Non-zero means success. */
166 /* Create an empty (uninitialized) parameter. */
169 pascm_make_param_smob (void)
171 param_smob *p_smob = (param_smob *)
172 scm_gc_malloc (sizeof (param_smob), param_smob_name);
175 memset (p_smob, 0, sizeof (*p_smob));
176 p_smob->cmd_class = no_class;
177 p_smob->type = var_boolean; /* ARI: var_boolean */
178 p_smob->set_func = SCM_BOOL_F;
179 p_smob->show_func = SCM_BOOL_F;
180 p_scm = scm_new_smob (parameter_smob_tag, (scm_t_bits) p_smob);
181 p_smob->containing_scm = p_scm;
182 gdbscm_init_gsmob (&p_smob->base);
187 /* Returns non-zero if SCM is a <gdb:parameter> object. */
190 pascm_is_parameter (SCM scm)
192 return SCM_SMOB_PREDICATE (parameter_smob_tag, scm);
195 /* (gdb:parameter? scm) -> boolean */
198 gdbscm_parameter_p (SCM scm)
200 return scm_from_bool (pascm_is_parameter (scm));
203 /* Returns the <gdb:parameter> object in SELF.
204 Throws an exception if SELF is not a <gdb:parameter> object. */
207 pascm_get_param_arg_unsafe (SCM self, int arg_pos, const char *func_name)
209 SCM_ASSERT_TYPE (pascm_is_parameter (self), self, arg_pos, func_name,
215 /* Returns a pointer to the parameter smob of SELF.
216 Throws an exception if SELF is not a <gdb:parameter> object. */
219 pascm_get_param_smob_arg_unsafe (SCM self, int arg_pos, const char *func_name)
221 SCM p_scm = pascm_get_param_arg_unsafe (self, arg_pos, func_name);
222 param_smob *p_smob = (param_smob *) SCM_SMOB_DATA (p_scm);
227 /* Return non-zero if parameter P_SMOB is valid. */
230 pascm_is_valid (param_smob *p_smob)
232 return p_smob->set_command != NULL;
235 /* A helper function which return the default documentation string for
236 a parameter (which is to say that it's undocumented). */
239 get_doc_string (void)
241 return xstrdup (_("This command is not documented."));
244 /* Subroutine of pascm_set_func, pascm_show_func to simplify them.
245 Signal the error returned from calling set_func/show_func. */
248 pascm_signal_setshow_error (SCM exception, const char *msg)
250 /* Don't print the stack if this was an error signalled by the command
252 if (gdbscm_user_error_p (gdbscm_exception_key (exception)))
254 char *excp_text = gdbscm_exception_message_to_string (exception);
256 make_cleanup (xfree, excp_text);
257 error ("%s", excp_text);
261 gdbscm_print_gdb_exception (SCM_BOOL_F, exception);
266 /* A callback function that is registered against the respective
267 add_setshow_* set_func prototype. This function will call
268 the Scheme function "set_func" which must exist.
269 Note: ARGS is always passed as NULL. */
272 pascm_set_func (char *args, int from_tty, struct cmd_list_element *c)
274 param_smob *p_smob = (param_smob *) get_cmd_context (c);
275 SCM self, result, exception;
277 struct cleanup *cleanups;
279 gdb_assert (gdbscm_is_procedure (p_smob->set_func));
281 self = p_smob->containing_scm;
283 result = gdbscm_safe_call_1 (p_smob->set_func, self, gdbscm_user_error_p);
285 if (gdbscm_is_exception (result))
287 pascm_signal_setshow_error (result,
288 _("Error occurred setting parameter."));
291 if (!scm_is_string (result))
292 error (_("Result of %s set-func is not a string."), p_smob->name);
294 msg = gdbscm_scm_to_host_string (result, NULL, &exception);
297 gdbscm_print_gdb_exception (SCM_BOOL_F, exception);
298 error (_("Error converting show text to host string."));
301 cleanups = make_cleanup (xfree, msg);
302 /* GDB is usually silent when a parameter is set. */
304 fprintf_filtered (gdb_stdout, "%s\n", msg);
305 do_cleanups (cleanups);
308 /* A callback function that is registered against the respective
309 add_setshow_* show_func prototype. This function will call
310 the Scheme function "show_func" which must exist and must return a
311 string that is then printed to FILE. */
314 pascm_show_func (struct ui_file *file, int from_tty,
315 struct cmd_list_element *c, const char *value)
317 param_smob *p_smob = (param_smob *) get_cmd_context (c);
318 SCM value_scm, self, result, exception;
320 struct cleanup *cleanups;
322 gdb_assert (gdbscm_is_procedure (p_smob->show_func));
324 value_scm = gdbscm_scm_from_host_string (value, strlen (value));
325 if (gdbscm_is_exception (value_scm))
327 error (_("Error converting parameter value \"%s\" to Scheme string."),
330 self = p_smob->containing_scm;
332 result = gdbscm_safe_call_2 (p_smob->show_func, self, value_scm,
333 gdbscm_user_error_p);
335 if (gdbscm_is_exception (result))
337 pascm_signal_setshow_error (result,
338 _("Error occurred showing parameter."));
341 msg = gdbscm_scm_to_host_string (result, NULL, &exception);
344 gdbscm_print_gdb_exception (SCM_BOOL_F, exception);
345 error (_("Error converting show text to host string."));
348 cleanups = make_cleanup (xfree, msg);
349 fprintf_filtered (file, "%s\n", msg);
350 do_cleanups (cleanups);
353 /* A helper function that dispatches to the appropriate add_setshow
357 add_setshow_generic (enum var_types param_type, enum command_class cmd_class,
358 char *cmd_name, param_smob *self,
359 char *set_doc, char *show_doc, char *help_doc,
360 cmd_sfunc_ftype *set_func,
361 show_value_ftype *show_func,
362 struct cmd_list_element **set_list,
363 struct cmd_list_element **show_list,
364 struct cmd_list_element **set_cmd,
365 struct cmd_list_element **show_cmd)
367 struct cmd_list_element *param = NULL;
368 const char *tmp_name = NULL;
373 add_setshow_boolean_cmd (cmd_name, cmd_class,
375 set_doc, show_doc, help_doc,
377 set_list, show_list);
381 case var_auto_boolean:
382 add_setshow_auto_boolean_cmd (cmd_name, cmd_class,
383 &self->value.autoboolval,
384 set_doc, show_doc, help_doc,
386 set_list, show_list);
390 add_setshow_uinteger_cmd (cmd_name, cmd_class,
391 &self->value.uintval,
392 set_doc, show_doc, help_doc,
394 set_list, show_list);
398 add_setshow_zinteger_cmd (cmd_name, cmd_class,
400 set_doc, show_doc, help_doc,
402 set_list, show_list);
406 add_setshow_zuinteger_cmd (cmd_name, cmd_class,
407 &self->value.uintval,
408 set_doc, show_doc, help_doc,
410 set_list, show_list);
413 case var_zuinteger_unlimited:
414 add_setshow_zuinteger_unlimited_cmd (cmd_name, cmd_class,
416 set_doc, show_doc, help_doc,
418 set_list, show_list);
422 add_setshow_string_cmd (cmd_name, cmd_class,
423 &self->value.stringval,
424 set_doc, show_doc, help_doc,
426 set_list, show_list);
429 case var_string_noescape:
430 add_setshow_string_noescape_cmd (cmd_name, cmd_class,
431 &self->value.stringval,
432 set_doc, show_doc, help_doc,
434 set_list, show_list);
438 case var_optional_filename:
439 add_setshow_optional_filename_cmd (cmd_name, cmd_class,
440 &self->value.stringval,
441 set_doc, show_doc, help_doc,
443 set_list, show_list);
447 add_setshow_filename_cmd (cmd_name, cmd_class,
448 &self->value.stringval,
449 set_doc, show_doc, help_doc,
451 set_list, show_list);
455 add_setshow_enum_cmd (cmd_name, cmd_class,
457 &self->value.cstringval,
458 set_doc, show_doc, help_doc,
460 set_list, show_list);
461 /* Initialize the value, just in case. */
462 self->value.cstringval = self->enumeration[0];
466 gdb_assert_not_reached ("bad param_type value");
469 /* Lookup created parameter, and register Scheme object against the
470 parameter context. Perform this task against both lists. */
472 param = lookup_cmd (&tmp_name, *show_list, "", 0, 1);
473 gdb_assert (param != NULL);
474 set_cmd_context (param, self);
478 param = lookup_cmd (&tmp_name, *set_list, "", 0, 1);
479 gdb_assert (param != NULL);
480 set_cmd_context (param, self);
484 /* Return an array of strings corresponding to the enum values for
486 Throws an exception if there's a problem with the values.
487 Space for the result is allocated from the GC heap. */
489 static const char * const *
490 compute_enum_list (SCM enum_values_scm, int arg_pos, const char *func_name)
494 const char * const *result;
496 SCM_ASSERT_TYPE (gdbscm_is_true (scm_list_p (enum_values_scm)),
497 enum_values_scm, arg_pos, func_name, _("list"));
499 size = scm_ilength (enum_values_scm);
502 gdbscm_out_of_range_error (FUNC_NAME, arg_pos, enum_values_scm,
503 _("enumeration list is empty"));
506 enum_values = xmalloc ((size + 1) * sizeof (char *));
507 memset (enum_values, 0, (size + 1) * sizeof (char *));
510 while (!scm_is_eq (enum_values_scm, SCM_EOL))
512 SCM value = scm_car (enum_values_scm);
515 if (!scm_is_string (value))
517 freeargv (enum_values);
518 SCM_ASSERT_TYPE (0, value, arg_pos, func_name, _("string"));
520 enum_values[i] = gdbscm_scm_to_host_string (value, NULL, &exception);
521 if (enum_values[i] == NULL)
523 freeargv (enum_values);
524 gdbscm_throw (exception);
527 enum_values_scm = scm_cdr (enum_values_scm);
529 gdb_assert (i == size);
531 result = gdbscm_gc_dup_argv (enum_values);
532 freeargv (enum_values);
536 static const scheme_integer_constant parameter_types[] =
538 /* Note: var_integer is deprecated, and intentionally does not
540 { "PARAM_BOOLEAN", var_boolean }, /* ARI: var_boolean */
541 { "PARAM_AUTO_BOOLEAN", var_auto_boolean },
542 { "PARAM_ZINTEGER", var_zinteger },
543 { "PARAM_UINTEGER", var_uinteger },
544 { "PARAM_ZUINTEGER", var_zuinteger },
545 { "PARAM_ZUINTEGER_UNLIMITED", var_zuinteger_unlimited },
546 { "PARAM_STRING", var_string },
547 { "PARAM_STRING_NOESCAPE", var_string_noescape },
548 { "PARAM_OPTIONAL_FILENAME", var_optional_filename },
549 { "PARAM_FILENAME", var_filename },
550 { "PARAM_ENUM", var_enum },
552 END_INTEGER_CONSTANTS
555 /* Return non-zero if PARAM_TYPE is a valid parameter type. */
558 pascm_valid_parameter_type_p (int param_type)
562 for (i = 0; parameter_types[i].name != NULL; ++i)
564 if (parameter_types[i].value == param_type)
571 /* Return PARAM_TYPE as a string. */
574 pascm_param_type_name (enum var_types param_type)
578 for (i = 0; parameter_types[i].name != NULL; ++i)
580 if (parameter_types[i].value == param_type)
581 return parameter_types[i].name;
584 gdb_assert_not_reached ("bad parameter type");
587 /* Return the value of a gdb parameter as a Scheme value.
588 If TYPE is not supported, then a <gdb:exception> object is returned. */
591 pascm_param_value (enum var_types type, void *var,
592 int arg_pos, const char *func_name)
594 /* Note: We *could* support var_integer here in case someone is trying to get
595 the value of a Python-created parameter (which is the only place that
596 still supports var_integer). To further discourage its use we do not. */
601 case var_string_noescape:
602 case var_optional_filename:
606 char *str = * (char **) var;
610 return gdbscm_scm_from_host_string (str, strlen (str));
621 case var_auto_boolean:
623 enum auto_boolean ab = * (enum auto_boolean *) var;
625 if (ab == AUTO_BOOLEAN_TRUE)
627 else if (ab == AUTO_BOOLEAN_FALSE)
633 case var_zuinteger_unlimited:
634 if (* (int *) var == -1)
635 return unlimited_keyword;
636 gdb_assert (* (int *) var >= 0);
639 return scm_from_int (* (int *) var);
642 if (* (unsigned int *) var == UINT_MAX)
643 return unlimited_keyword;
646 return scm_from_uint (* (unsigned int *) var);
652 return gdbscm_make_out_of_range_error (func_name, arg_pos,
654 _("program error: unhandled type"));
657 /* Set the value of a parameter of type TYPE in VAR from VALUE.
658 ENUMERATION is the list of enum values for enum parameters, otherwise NULL.
659 Throws a Scheme exception if VALUE_SCM is invalid for TYPE. */
662 pascm_set_param_value_x (enum var_types type, union pascm_variable *var,
663 const char * const *enumeration,
664 SCM value, int arg_pos, const char *func_name)
669 case var_string_noescape:
670 case var_optional_filename:
672 SCM_ASSERT_TYPE (scm_is_string (value)
673 || (type != var_filename
674 && gdbscm_is_false (value)),
675 value, arg_pos, func_name,
676 _("string or #f for non-PARAM_FILENAME parameters"));
677 if (gdbscm_is_false (value))
679 xfree (var->stringval);
680 if (type == var_optional_filename)
681 var->stringval = xstrdup ("");
683 var->stringval = NULL;
690 string = gdbscm_scm_to_host_string (value, NULL, &exception);
692 gdbscm_throw (exception);
693 xfree (var->stringval);
694 var->stringval = string;
704 SCM_ASSERT_TYPE (scm_is_string (value), value, arg_pos, func_name,
706 str = gdbscm_scm_to_host_string (value, NULL, &exception);
708 gdbscm_throw (exception);
709 for (i = 0; enumeration[i]; ++i)
711 if (strcmp (enumeration[i], str) == 0)
715 if (enumeration[i] == NULL)
717 gdbscm_out_of_range_error (func_name, arg_pos, value,
718 _("not member of enumeration"));
720 var->cstringval = enumeration[i];
725 SCM_ASSERT_TYPE (gdbscm_is_bool (value), value, arg_pos, func_name,
727 var->intval = gdbscm_is_true (value);
730 case var_auto_boolean:
731 SCM_ASSERT_TYPE (gdbscm_is_bool (value)
732 || scm_is_eq (value, auto_keyword),
733 value, arg_pos, func_name,
734 _("boolean or #:auto"));
735 if (scm_is_eq (value, auto_keyword))
736 var->autoboolval = AUTO_BOOLEAN_AUTO;
737 else if (gdbscm_is_true (value))
738 var->autoboolval = AUTO_BOOLEAN_TRUE;
740 var->autoboolval = AUTO_BOOLEAN_FALSE;
746 case var_zuinteger_unlimited:
747 if (type == var_uinteger
748 || type == var_zuinteger_unlimited)
750 SCM_ASSERT_TYPE (gdbscm_is_bool (value)
751 || scm_is_eq (value, unlimited_keyword),
752 value, arg_pos, func_name,
753 _("integer or #:unlimited"));
754 if (scm_is_eq (value, unlimited_keyword))
756 if (type == var_uinteger)
757 var->intval = UINT_MAX;
765 SCM_ASSERT_TYPE (scm_is_integer (value), value, arg_pos, func_name,
769 if (type == var_uinteger
770 || type == var_zuinteger)
772 unsigned int u = scm_to_uint (value);
774 if (type == var_uinteger && u == 0)
780 int i = scm_to_int (value);
782 if (type == var_zuinteger_unlimited && i < -1)
784 gdbscm_out_of_range_error (func_name, arg_pos, value,
792 gdb_assert_not_reached ("bad parameter type");
796 /* Parameter Scheme functions. */
798 /* (make-parameter name
799 [#:command-class cmd-class] [#:parameter-type param-type]
800 [#:enum-list enum-list] [#:set-func function] [#:show-func function]
801 [#:doc <string>] [#:set-doc <string>] [#:show-doc <string>]
802 [#:initial-value initial-value]) -> <gdb:parameter>
804 NAME is the name of the parameter. It may consist of multiple
805 words, in which case the final word is the name of the new parameter,
806 and earlier words must be prefix commands.
808 CMD-CLASS is the kind of command. It should be one of the COMMAND_*
809 constants defined in the gdb module.
811 PARAM_TYPE is the type of the parameter. It should be one of the
812 PARAM_* constants defined in the gdb module.
814 If PARAM-TYPE is PARAM_ENUM, then ENUM-LIST is a list of strings that
815 are the valid values for this parameter. The first value is the default.
817 SET-FUNC, if provided, is called after the parameter is set.
818 It is a function of one parameter: the <gdb:parameter> object.
819 It must return a string to be displayed to the user.
820 Setting a parameter is typically a silent operation, so typically ""
823 SHOW-FUNC, if provided, returns the string that is printed.
824 It is a function of two parameters: the <gdb:parameter> object
825 and the current value of the parameter as a string.
827 DOC, SET-DOC, SHOW-DOC are the doc strings for the parameter.
829 INITIAL-VALUE is the initial value of the parameter.
831 The result is the <gdb:parameter> Scheme object.
832 The parameter is not available to be used yet, however.
833 It must still be added to gdb with register-parameter!. */
836 gdbscm_make_parameter (SCM name_scm, SCM rest)
838 const SCM keywords[] = {
839 command_class_keyword, parameter_type_keyword, enum_list_keyword,
840 set_func_keyword, show_func_keyword,
841 doc_keyword, set_doc_keyword, show_doc_keyword,
842 initial_value_keyword, SCM_BOOL_F
844 int cmd_class_arg_pos = -1, param_type_arg_pos = -1;
845 int enum_list_arg_pos = -1, set_func_arg_pos = -1, show_func_arg_pos = -1;
846 int doc_arg_pos = -1, set_doc_arg_pos = -1, show_doc_arg_pos = -1;
847 int initial_value_arg_pos = -1;
850 int cmd_class = no_class;
851 int param_type = var_boolean; /* ARI: var_boolean */
852 SCM enum_list_scm = SCM_BOOL_F;
853 SCM set_func = SCM_BOOL_F, show_func = SCM_BOOL_F;
854 char *doc = NULL, *set_doc = NULL, *show_doc = NULL;
855 SCM initial_value_scm = SCM_BOOL_F;
856 const char * const *enum_list = NULL;
860 gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, keywords, "s#iiOOOsssO",
861 name_scm, &name, rest,
862 &cmd_class_arg_pos, &cmd_class,
863 ¶m_type_arg_pos, ¶m_type,
864 &enum_list_arg_pos, &enum_list_scm,
865 &set_func_arg_pos, &set_func,
866 &show_func_arg_pos, &show_func,
868 &set_doc_arg_pos, &set_doc,
869 &show_doc_arg_pos, &show_doc,
870 &initial_value_arg_pos, &initial_value_scm);
872 /* If doc is NULL, leave it NULL. See add_setshow_cmd_full. */
874 set_doc = get_doc_string ();
875 if (show_doc == NULL)
876 show_doc = get_doc_string ();
879 name = gdbscm_canonicalize_command_name (s, 0);
884 doc = gdbscm_gc_xstrdup (s);
888 set_doc = gdbscm_gc_xstrdup (s);
891 show_doc = gdbscm_gc_xstrdup (s);
894 if (!gdbscm_valid_command_class_p (cmd_class))
896 gdbscm_out_of_range_error (FUNC_NAME, cmd_class_arg_pos,
897 scm_from_int (cmd_class),
898 _("invalid command class argument"));
900 if (!pascm_valid_parameter_type_p (param_type))
902 gdbscm_out_of_range_error (FUNC_NAME, param_type_arg_pos,
903 scm_from_int (param_type),
904 _("invalid parameter type argument"));
906 if (enum_list_arg_pos > 0 && param_type != var_enum)
908 gdbscm_misc_error (FUNC_NAME, enum_list_arg_pos, enum_list_scm,
909 _("#:enum-values can only be provided with PARAM_ENUM"));
911 if (enum_list_arg_pos < 0 && param_type == var_enum)
913 gdbscm_misc_error (FUNC_NAME, GDBSCM_ARG_NONE, SCM_BOOL_F,
914 _("PARAM_ENUM requires an enum-values argument"));
916 if (set_func_arg_pos > 0)
918 SCM_ASSERT_TYPE (gdbscm_is_procedure (set_func), set_func,
919 set_func_arg_pos, FUNC_NAME, _("procedure"));
921 if (show_func_arg_pos > 0)
923 SCM_ASSERT_TYPE (gdbscm_is_procedure (show_func), show_func,
924 show_func_arg_pos, FUNC_NAME, _("procedure"));
926 if (param_type == var_enum)
928 /* Note: enum_list lives in GC space, so we don't have to worry about
929 freeing it if we later throw an exception. */
930 enum_list = compute_enum_list (enum_list_scm, enum_list_arg_pos,
934 /* If initial-value is a function, we need the parameter object constructed
935 to pass it to the function. A typical thing the function may want to do
936 is add an object-property to it to record the last known good value. */
937 p_scm = pascm_make_param_smob ();
938 p_smob = (param_smob *) SCM_SMOB_DATA (p_scm);
939 /* These are all stored in GC space so that we don't have to worry about
940 freeing them if we throw an exception. */
942 p_smob->cmd_class = cmd_class;
943 p_smob->type = (enum var_types) param_type;
945 p_smob->set_doc = set_doc;
946 p_smob->show_doc = show_doc;
947 p_smob->enumeration = enum_list;
948 p_smob->set_func = set_func;
949 p_smob->show_func = show_func;
951 if (initial_value_arg_pos > 0)
953 if (gdbscm_is_procedure (initial_value_scm))
955 initial_value_scm = gdbscm_safe_call_1 (initial_value_scm,
956 p_smob->containing_scm, NULL);
957 if (gdbscm_is_exception (initial_value_scm))
958 gdbscm_throw (initial_value_scm);
960 pascm_set_param_value_x (param_type, &p_smob->value, enum_list,
962 initial_value_arg_pos, FUNC_NAME);
968 /* Subroutine of gdbscm_register_parameter_x to simplify it.
969 Return non-zero if parameter NAME is already defined in LIST. */
972 pascm_parameter_defined_p (const char *name, struct cmd_list_element *list)
974 struct cmd_list_element *c;
976 c = lookup_cmd_1 (&name, list, NULL, 1);
978 /* If the name is ambiguous that's ok, it's a new parameter still. */
979 return c != NULL && c != CMD_LIST_AMBIGUOUS;
982 /* (register-parameter! <gdb:parameter>) -> unspecified
984 It is an error to register a pre-existing parameter. */
987 gdbscm_register_parameter_x (SCM self)
990 = pascm_get_param_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
992 struct cmd_list_element **set_list, **show_list;
993 volatile struct gdb_exception except;
995 if (pascm_is_valid (p_smob))
996 scm_misc_error (FUNC_NAME, _("parameter is already registered"), SCM_EOL);
998 cmd_name = gdbscm_parse_command_name (p_smob->name, FUNC_NAME, SCM_ARG1,
999 &set_list, &setlist);
1001 cmd_name = gdbscm_parse_command_name (p_smob->name, FUNC_NAME, SCM_ARG1,
1002 &show_list, &showlist);
1003 p_smob->cmd_name = gdbscm_gc_xstrdup (cmd_name);
1006 if (pascm_parameter_defined_p (p_smob->cmd_name, *set_list))
1008 gdbscm_misc_error (FUNC_NAME, SCM_ARG1, self,
1009 _("parameter exists, \"set\" command is already defined"));
1011 if (pascm_parameter_defined_p (p_smob->cmd_name, *show_list))
1013 gdbscm_misc_error (FUNC_NAME, SCM_ARG1, self,
1014 _("parameter exists, \"show\" command is already defined"));
1017 TRY_CATCH (except, RETURN_MASK_ALL)
1019 add_setshow_generic (p_smob->type, p_smob->cmd_class,
1020 p_smob->cmd_name, p_smob,
1021 p_smob->set_doc, p_smob->show_doc, p_smob->doc,
1022 (gdbscm_is_procedure (p_smob->set_func)
1023 ? pascm_set_func : NULL),
1024 (gdbscm_is_procedure (p_smob->show_func)
1025 ? pascm_show_func : NULL),
1026 set_list, show_list,
1027 &p_smob->set_command, &p_smob->show_command);
1029 GDBSCM_HANDLE_GDB_EXCEPTION (except);
1031 /* Note: At this point the parameter exists in gdb.
1032 So no more errors after this point. */
1034 /* The owner of this parameter is not in GC-controlled memory, so we need
1035 to protect it from GC until the parameter is deleted. */
1036 scm_gc_protect_object (p_smob->containing_scm);
1038 return SCM_UNSPECIFIED;
1041 /* (parameter-value <gdb:parameter>) -> value
1042 (parameter-value <string>) -> value */
1045 gdbscm_parameter_value (SCM self)
1047 SCM_ASSERT_TYPE (pascm_is_parameter (self) || scm_is_string (self),
1048 self, SCM_ARG1, FUNC_NAME, _("<gdb:parameter> or string"));
1050 if (pascm_is_parameter (self))
1052 param_smob *p_smob = pascm_get_param_smob_arg_unsafe (self, SCM_ARG1,
1055 return pascm_param_value (p_smob->type, &p_smob->value,
1056 SCM_ARG1, FUNC_NAME);
1062 struct cmd_list_element *alias, *prefix, *cmd;
1066 volatile struct gdb_exception except;
1068 name = gdbscm_scm_to_host_string (self, NULL, &except_scm);
1070 gdbscm_throw (except_scm);
1071 newarg = concat ("show ", name, (char *) NULL);
1072 TRY_CATCH (except, RETURN_MASK_ALL)
1074 found = lookup_cmd_composition (newarg, &alias, &prefix, &cmd);
1078 GDBSCM_HANDLE_GDB_EXCEPTION (except);
1081 gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG1, self,
1082 _("parameter not found"));
1084 if (cmd->var == NULL)
1086 gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG1, self,
1087 _("not a parameter"));
1090 return pascm_param_value (cmd->var_type, cmd->var, SCM_ARG1, FUNC_NAME);
1094 /* (set-parameter-value! <gdb:parameter> value) -> unspecified */
1097 gdbscm_set_parameter_value_x (SCM self, SCM value)
1099 param_smob *p_smob = pascm_get_param_smob_arg_unsafe (self, SCM_ARG1,
1102 pascm_set_param_value_x (p_smob->type, &p_smob->value, p_smob->enumeration,
1103 value, SCM_ARG2, FUNC_NAME);
1105 return SCM_UNSPECIFIED;
1108 /* Initialize the Scheme parameter support. */
1110 static const scheme_function parameter_functions[] =
1112 { "make-parameter", 1, 0, 1, gdbscm_make_parameter,
1114 Make a GDB parameter object.\n\
1117 [#:command-class <cmd-class>] [#:parameter-type <parameter-type>]\n\
1118 [#:enum-list <enum-list>]\n\
1119 [#:set-func function] [#:show-func function]\n\
1120 [#:doc string] [#:set-doc string] [#:show-doc string]\n\
1121 [#:initial-value initial-value]\n\
1122 name: The name of the command. It may consist of multiple words,\n\
1123 in which case the final word is the name of the new parameter, and\n\
1124 earlier words must be prefix commands.\n\
1125 cmd-class: The class of the command, one of COMMAND_*.\n\
1126 The default is COMMAND_NONE.\n\
1127 parameter-type: The kind of parameter, one of PARAM_*\n\
1128 The default is PARAM_BOOLEAN.\n\
1129 enum-list: If parameter-type is PARAM_ENUM, then this specifies the set\n\
1130 of values of the enum.\n\
1131 set-func: A function of one parameter: the <gdb:parameter> object.\n\
1132 Called *after* the parameter has been set. Returns either \"\" or a\n\
1133 non-empty string to be displayed to the user.\n\
1134 If non-empty, GDB will add a trailing newline.\n\
1135 show-func: A function of two parameters: the <gdb:parameter> object\n\
1136 and the string representation of the current value.\n\
1137 The result is a string to be displayed to the user.\n\
1138 GDB will add a trailing newline.\n\
1139 doc: The \"doc string\" of the parameter.\n\
1140 set-doc: The \"doc string\" when setting the parameter.\n\
1141 show-doc: The \"doc string\" when showing the parameter.\n\
1142 initial-value: The initial value of the parameter." },
1144 { "register-parameter!", 1, 0, 0, gdbscm_register_parameter_x,
1146 Register a <gdb:parameter> object with GDB." },
1148 { "parameter?", 1, 0, 0, gdbscm_parameter_p,
1150 Return #t if the object is a <gdb:parameter> object." },
1152 { "parameter-value", 1, 0, 0, gdbscm_parameter_value,
1154 Return the value of a <gdb:parameter> object\n\
1155 or any gdb parameter if param is a string naming the parameter." },
1157 { "set-parameter-value!", 2, 0, 0, gdbscm_set_parameter_value_x,
1159 Set the value of a <gdb:parameter> object.\n\
1161 Arguments: <gdb:parameter> value" },
1167 gdbscm_initialize_parameters (void)
1170 = gdbscm_make_smob_type (param_smob_name, sizeof (param_smob));
1171 scm_set_smob_print (parameter_smob_tag, pascm_print_param_smob);
1173 gdbscm_define_integer_constants (parameter_types, 1);
1174 gdbscm_define_functions (parameter_functions, 1);
1176 command_class_keyword = scm_from_latin1_keyword ("command-class");
1177 parameter_type_keyword = scm_from_latin1_keyword ("parameter-type");
1178 enum_list_keyword = scm_from_latin1_keyword ("enum-list");
1179 set_func_keyword = scm_from_latin1_keyword ("set-func");
1180 show_func_keyword = scm_from_latin1_keyword ("show-func");
1181 doc_keyword = scm_from_latin1_keyword ("doc");
1182 set_doc_keyword = scm_from_latin1_keyword ("set-doc");
1183 show_doc_keyword = scm_from_latin1_keyword ("show-doc");
1184 initial_value_keyword = scm_from_latin1_keyword ("initial-value");
1185 auto_keyword = scm_from_latin1_keyword ("auto");
1186 unlimited_keyword = scm_from_latin1_keyword ("unlimited");