1 /* Internal header for GDB/Scheme code.
3 Copyright (C) 2014-2022 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 #ifndef GUILE_GUILE_INTERNAL_H
21 #define GUILE_GUILE_INTERNAL_H
23 /* See README file in this directory for implementation notes, coding
24 conventions, et.al. */
28 #include "extension-priv.h"
38 /* A function to pass to the safe-call routines to ignore things like
40 typedef int excp_matcher_func (SCM key);
42 /* Scheme variables to define during initialization. */
44 struct scheme_variable
48 const char *doc_string;
51 /* End of scheme_variable table mark. */
53 #define END_VARIABLES { NULL, SCM_BOOL_F, NULL }
55 /* Although scm_t_subr is meant to hold a function pointer, at least
56 in some versions of guile, it is actually a typedef to "void *".
57 That means that in C++, an explicit cast is necessary to convert
58 function pointer to scm_t_subr. But a cast also makes it possible
59 to pass function pointers with the wrong type by mistake. So
60 instead of adding such casts throughout, we use 'as_a_scm_t_subr'
61 to do the conversion, which (only) has overloads for function
62 pointer types that are valid.
64 See https://lists.gnu.org/archive/html/guile-devel/2013-03/msg00001.html.
67 static inline scm_t_subr
68 as_a_scm_t_subr (SCM (*func) (void))
70 return (scm_t_subr) func;
73 static inline scm_t_subr
74 as_a_scm_t_subr (SCM (*func) (SCM))
76 return (scm_t_subr) func;
79 static inline scm_t_subr
80 as_a_scm_t_subr (SCM (*func) (SCM, SCM))
82 return (scm_t_subr) func;
85 static inline scm_t_subr
86 as_a_scm_t_subr (SCM (*func) (SCM, SCM, SCM))
88 return (scm_t_subr) func;
91 /* Scheme functions to define during initialization. */
93 struct scheme_function
100 const char *doc_string;
103 /* End of scheme_function table mark. */
105 #define END_FUNCTIONS { NULL, 0, 0, 0, NULL, NULL }
107 /* Useful for defining a set of constants. */
109 struct scheme_integer_constant
115 #define END_INTEGER_CONSTANTS { NULL, 0 }
117 /* Pass this instead of 0 to routines like SCM_ASSERT to indicate the value
118 is not a function argument. */
119 #define GDBSCM_ARG_NONE 0
121 /* Ensure new code doesn't accidentally try to use this. */
122 #undef scm_make_smob_type
123 #define scm_make_smob_type USE_gdbscm_make_smob_type_INSTEAD
125 /* They brought over () == #f from lisp.
126 Let's avoid that for now. */
130 #define scm_is_bool USE_gdbscm_is_bool_INSTEAD
131 #define scm_is_false USE_gdbscm_is_false_INSTEAD
132 #define scm_is_true USE_gdbscm_is_true_INSTEAD
133 #define gdbscm_is_bool(scm) \
134 (scm_is_eq ((scm), SCM_BOOL_F) || scm_is_eq ((scm), SCM_BOOL_T))
135 #define gdbscm_is_false(scm) scm_is_eq ((scm), SCM_BOOL_F)
136 #define gdbscm_is_true(scm) (!gdbscm_is_false (scm))
138 #ifndef HAVE_SCM_NEW_SMOB
140 /* Guile <= 2.0.5 did not provide this function, so provide it here. */
143 scm_new_smob (scm_t_bits tc, scm_t_bits data)
145 SCM_RETURN_NEWSMOB (tc, data);
150 /* Function name that is passed around in case an error needs to be reported.
151 __func is in C99, but we provide a wrapper "just in case",
152 and because FUNC_NAME is the canonical value used in guile sources.
153 IWBN to use the Scheme version of the name (e.g. foo-bar vs foo_bar),
154 but let's KISS for now. */
155 #define FUNC_NAME __func__
157 extern const char gdbscm_module_name[];
158 extern const char gdbscm_init_module_name[];
160 extern int gdb_scheme_initialized;
162 extern int gdbscm_guile_major_version;
163 extern int gdbscm_guile_minor_version;
164 extern int gdbscm_guile_micro_version;
166 extern const char gdbscm_print_excp_none[];
167 extern const char gdbscm_print_excp_full[];
168 extern const char gdbscm_print_excp_message[];
169 extern const char *gdbscm_print_excp;
171 extern SCM gdbscm_documentation_symbol;
172 extern SCM gdbscm_invalid_object_error_symbol;
174 extern SCM gdbscm_map_string;
175 extern SCM gdbscm_array_string;
176 extern SCM gdbscm_string_string;
180 extern void gdbscm_define_variables (const scheme_variable *, int is_public);
182 extern void gdbscm_define_functions (const scheme_function *, int is_public);
184 extern void gdbscm_define_integer_constants (const scheme_integer_constant *,
187 extern void gdbscm_printf (SCM port, const char *format, ...)
188 ATTRIBUTE_PRINTF (2, 3);
190 extern void gdbscm_debug_display (SCM obj);
192 extern void gdbscm_debug_write (SCM obj);
194 extern void gdbscm_parse_function_args (const char *function_name,
195 int beginning_arg_pos,
197 const char *format, ...);
199 extern SCM gdbscm_scm_from_longest (LONGEST l);
201 extern LONGEST gdbscm_scm_to_longest (SCM l);
203 extern SCM gdbscm_scm_from_ulongest (ULONGEST l);
205 extern ULONGEST gdbscm_scm_to_ulongest (SCM u);
207 extern void gdbscm_dynwind_xfree (void *ptr);
209 extern int gdbscm_is_procedure (SCM proc);
211 extern char *gdbscm_gc_xstrdup (const char *);
213 extern const char * const *gdbscm_gc_dup_argv (char **argv);
215 extern int gdbscm_guile_version_is_at_least (int major, int minor, int micro);
217 /* GDB smobs, from scm-gsmob.c */
219 /* All gdb smobs must contain one of the following as the first member:
220 gdb_smob, chained_gdb_smob, or eqable_gdb_smob.
222 Chained GDB smobs should have chained_gdb_smob as their first member. The
223 next,prev members of chained_gdb_smob allow for chaining gsmobs together so
224 that, for example, when an objfile is deleted we can clean up all smobs that
227 Eq-able GDB smobs should have eqable_gdb_smob as their first member. The
228 containing_scm member of eqable_gdb_smob allows for returning the same gsmob
229 instead of creating a new one, allowing them to be eq?-able.
231 All other smobs should have gdb_smob as their first member.
232 FIXME: dje/2014-05-26: gdb_smob was useful during early development as a
233 "baseclass" for all gdb smobs. If it's still unused by gdb 8.0 delete it.
235 IMPORTANT: chained_gdb_smob and eqable_gdb-smob are "subclasses" of
236 gdb_smob. The layout of chained_gdb_smob,eqable_gdb_smob must match
237 gdb_smob as if it is a subclass. To that end we use macro GDB_SMOB_HEAD
240 #define GDB_SMOB_HEAD \
241 int empty_base_class;
248 struct chained_gdb_smob
252 chained_gdb_smob *prev;
253 chained_gdb_smob *next;
256 struct eqable_gdb_smob
260 /* The object we are contained in.
261 This can be used for several purposes.
262 This is used by the eq? machinery: We need to be able to see if we have
263 already created an object for a symbol, and if so use that SCM.
264 This may also be used to protect the smob from GC if there is
265 a reference to this smob from outside of GC space (i.e., from gdb).
266 This can also be used in place of chained_gdb_smob where we need to
267 keep track of objfile referencing objects. When the objfile is deleted
268 we need to invalidate the objects: we can do that using the same hashtab
269 used to record the smob for eq-ability. */
277 /* A predicate that returns non-zero if an object is a particular kind
279 typedef int (gsmob_pred_func) (SCM);
281 extern scm_t_bits gdbscm_make_smob_type (const char *name, size_t size);
283 extern void gdbscm_init_gsmob (gdb_smob *base);
285 extern void gdbscm_init_chained_gsmob (chained_gdb_smob *base);
287 extern void gdbscm_init_eqable_gsmob (eqable_gdb_smob *base,
290 extern htab_t gdbscm_create_eqable_gsmob_ptr_map (htab_hash hash_fn,
293 extern eqable_gdb_smob **gdbscm_find_eqable_gsmob_ptr_slot
294 (htab_t htab, eqable_gdb_smob *base);
296 extern void gdbscm_fill_eqable_gsmob_ptr_slot (eqable_gdb_smob **slot,
297 eqable_gdb_smob *base);
299 extern void gdbscm_clear_eqable_gsmob_ptr_slot (htab_t htab,
300 eqable_gdb_smob *base);
302 /* Exceptions and calling out to Guile. */
304 /* scm-exception.c */
306 extern SCM gdbscm_make_exception (SCM tag, SCM args);
308 extern int gdbscm_is_exception (SCM scm);
310 extern SCM gdbscm_exception_key (SCM excp);
312 extern SCM gdbscm_exception_args (SCM excp);
314 extern SCM gdbscm_make_exception_with_stack (SCM key, SCM args, SCM stack);
316 extern SCM gdbscm_make_error_scm (SCM key, SCM subr, SCM message,
319 extern SCM gdbscm_make_error (SCM key, const char *subr, const char *message,
322 extern SCM gdbscm_make_type_error (const char *subr, int arg_pos,
323 SCM bad_value, const char *expected_type);
325 extern SCM gdbscm_make_invalid_object_error (const char *subr, int arg_pos,
326 SCM bad_value, const char *error);
328 extern void gdbscm_invalid_object_error (const char *subr, int arg_pos,
329 SCM bad_value, const char *error)
332 extern SCM gdbscm_make_out_of_range_error (const char *subr, int arg_pos,
333 SCM bad_value, const char *error);
335 extern void gdbscm_out_of_range_error (const char *subr, int arg_pos,
336 SCM bad_value, const char *error)
339 extern SCM gdbscm_make_misc_error (const char *subr, int arg_pos,
340 SCM bad_value, const char *error);
342 extern void gdbscm_misc_error (const char *subr, int arg_pos,
343 SCM bad_value, const char *error)
346 extern void gdbscm_throw (SCM exception) ATTRIBUTE_NORETURN;
348 struct gdbscm_gdb_exception;
349 extern SCM gdbscm_scm_from_gdb_exception
350 (const gdbscm_gdb_exception &exception);
352 extern void gdbscm_throw_gdb_exception (gdbscm_gdb_exception exception)
355 extern void gdbscm_print_exception_with_stack (SCM port, SCM stack,
358 extern void gdbscm_print_gdb_exception (SCM port, SCM exception);
360 extern gdb::unique_xmalloc_ptr<char> gdbscm_exception_message_to_string
363 extern excp_matcher_func gdbscm_memory_error_p;
365 extern excp_matcher_func gdbscm_user_error_p;
367 extern SCM gdbscm_make_memory_error (const char *subr, const char *msg,
370 extern void gdbscm_memory_error (const char *subr, const char *msg, SCM args)
373 /* scm-safe-call.c */
375 extern const char *gdbscm_with_guile (const char *(*func) (void *), void *data);
377 extern SCM gdbscm_call_guile (SCM (*func) (void *), void *data,
378 excp_matcher_func *ok_excps);
380 extern SCM gdbscm_safe_call_0 (SCM proc, excp_matcher_func *ok_excps);
382 extern SCM gdbscm_safe_call_1 (SCM proc, SCM arg0,
383 excp_matcher_func *ok_excps);
385 extern SCM gdbscm_safe_call_2 (SCM proc, SCM arg0, SCM arg1,
386 excp_matcher_func *ok_excps);
388 extern SCM gdbscm_safe_call_3 (SCM proc, SCM arg0, SCM arg1, SCM arg2,
389 excp_matcher_func *ok_excps);
391 extern SCM gdbscm_safe_call_4 (SCM proc, SCM arg0, SCM arg1, SCM arg2,
393 excp_matcher_func *ok_excps);
395 extern SCM gdbscm_safe_apply_1 (SCM proc, SCM arg0, SCM args,
396 excp_matcher_func *ok_excps);
398 extern SCM gdbscm_unsafe_call_1 (SCM proc, SCM arg0);
400 extern gdb::unique_xmalloc_ptr<char> gdbscm_safe_eval_string
401 (const char *string, int display_result);
403 extern gdb::unique_xmalloc_ptr<char> gdbscm_safe_source_script
404 (const char *filename);
406 extern void gdbscm_enter_repl (void);
408 /* Interface to various GDB objects, in alphabetical order. */
414 extern struct gdbarch *arscm_get_gdbarch (arch_smob *a_smob);
416 extern arch_smob *arscm_get_arch_smob_arg_unsafe (SCM arch_scm, int arg_pos,
417 const char *func_name);
419 extern SCM arscm_scm_from_arch (struct gdbarch *gdbarch);
423 extern SCM bkscm_scm_from_block (const struct block *block,
424 struct objfile *objfile);
426 extern const struct block *bkscm_scm_to_block
427 (SCM block_scm, int arg_pos, const char *func_name, SCM *excp);
431 extern char *gdbscm_parse_command_name (const char *name,
432 const char *func_name, int arg_pos,
433 struct cmd_list_element ***base_list,
434 struct cmd_list_element **start_list);
436 extern int gdbscm_valid_command_class_p (int command_class);
438 extern char *gdbscm_canonicalize_command_name (const char *name,
439 int want_trailing_space);
445 extern int frscm_is_frame (SCM scm);
447 extern frame_smob *frscm_get_frame_smob_arg_unsafe (SCM frame_scm, int arg_pos,
448 const char *func_name);
450 extern struct frame_info_ptr frscm_frame_smob_to_frame (frame_smob *);
454 struct iterator_smob;
456 extern SCM itscm_iterator_smob_object (iterator_smob *i_smob);
458 extern SCM itscm_iterator_smob_progress (iterator_smob *i_smob);
460 extern void itscm_set_iterator_smob_progress_x (iterator_smob *i_smob,
463 extern const char *itscm_iterator_smob_name (void);
465 extern SCM gdbscm_make_iterator (SCM object, SCM progress, SCM next);
467 extern int itscm_is_iterator (SCM scm);
469 extern SCM gdbscm_end_of_iteration (void);
471 extern int itscm_is_end_of_iteration (SCM obj);
473 extern SCM itscm_safe_call_next_x (SCM iter, excp_matcher_func *ok_excps);
475 extern SCM itscm_get_iterator_arg_unsafe (SCM self, int arg_pos,
476 const char *func_name);
478 /* scm-lazy-string.c */
480 extern int lsscm_is_lazy_string (SCM scm);
482 extern SCM lsscm_make_lazy_string (CORE_ADDR address, int length,
483 const char *encoding, struct type *type);
485 extern struct value *lsscm_safe_lazy_string_to_value (SCM string,
487 const char *func_name,
490 extern void lsscm_val_print_lazy_string
491 (SCM string, struct ui_file *stream,
492 const struct value_print_options *options);
498 extern SCM ofscm_objfile_smob_pretty_printers (objfile_smob *o_smob);
500 extern objfile_smob *ofscm_objfile_smob_from_objfile (struct objfile *objfile);
502 extern SCM ofscm_scm_from_objfile (struct objfile *objfile);
504 /* scm-progspace.c */
508 extern SCM psscm_pspace_smob_pretty_printers (const pspace_smob *);
510 extern pspace_smob *psscm_pspace_smob_from_pspace (struct program_space *);
512 extern SCM psscm_scm_from_pspace (struct program_space *);
516 extern int gdbscm_scm_string_to_int (SCM string);
518 extern gdb::unique_xmalloc_ptr<char> gdbscm_scm_to_c_string (SCM string);
520 extern SCM gdbscm_scm_from_c_string (const char *string);
522 extern SCM gdbscm_scm_from_printf (const char *format, ...)
523 ATTRIBUTE_PRINTF (1, 2);
525 extern gdb::unique_xmalloc_ptr<char> gdbscm_scm_to_string
526 (SCM string, size_t *lenp, const char *charset, int strict, SCM *except_scmp);
528 extern SCM gdbscm_scm_from_string (const char *string, size_t len,
529 const char *charset, int strict);
531 extern gdb::unique_xmalloc_ptr<char> gdbscm_scm_to_host_string
532 (SCM string, size_t *lenp, SCM *except);
534 extern SCM gdbscm_scm_from_host_string (const char *string, size_t len);
538 extern int syscm_is_symbol (SCM scm);
540 extern SCM syscm_scm_from_symbol (struct symbol *symbol);
542 extern struct symbol *syscm_get_valid_symbol_arg_unsafe
543 (SCM self, int arg_pos, const char *func_name);
547 extern SCM stscm_scm_from_symtab (struct symtab *symtab);
549 extern SCM stscm_scm_from_sal (struct symtab_and_line sal);
555 extern int tyscm_is_type (SCM scm);
557 extern SCM tyscm_scm_from_type (struct type *type);
559 extern type_smob *tyscm_get_type_smob_arg_unsafe (SCM type_scm, int arg_pos,
560 const char *func_name);
562 extern struct type *tyscm_scm_to_type (SCM t_scm);
564 extern struct type *tyscm_type_smob_type (type_smob *t_smob);
566 extern SCM tyscm_scm_from_field (SCM type_scm, int field_num);
570 extern struct value *vlscm_scm_to_value (SCM scm);
572 extern int vlscm_is_value (SCM scm);
574 extern SCM vlscm_scm_from_value (struct value *value);
575 extern SCM vlscm_scm_from_value_no_release (struct value *value);
577 extern struct value *vlscm_convert_typed_value_from_scheme
578 (const char *func_name, int obj_arg_pos, SCM obj,
579 int type_arg_pos, SCM type_scm, struct type *type, SCM *except_scmp,
580 struct gdbarch *gdbarch, const struct language_defn *language);
582 extern struct value *vlscm_convert_value_from_scheme
583 (const char *func_name, int obj_arg_pos, SCM obj, SCM *except_scmp,
584 struct gdbarch *gdbarch, const struct language_defn *language);
586 /* stript_lang methods */
588 extern objfile_script_sourcer_func gdbscm_source_objfile_script;
589 extern objfile_script_executor_func gdbscm_execute_objfile_script;
591 /* Return true if auto-loading Guile scripts is enabled.
592 This is the extension_language_script_ops.auto_load_enabled "method". */
594 extern bool gdbscm_auto_load_enabled (const struct extension_language_defn *);
596 extern void gdbscm_preserve_values
597 (const struct extension_language_defn *,
598 struct objfile *, htab_t copied_types);
600 extern enum ext_lang_rc gdbscm_apply_val_pretty_printer
601 (const struct extension_language_defn *,
603 struct ui_file *stream, int recurse,
604 const struct value_print_options *options,
605 const struct language_defn *language);
607 extern int gdbscm_breakpoint_has_cond (const struct extension_language_defn *,
608 struct breakpoint *b);
610 extern enum ext_lang_bp_stop gdbscm_breakpoint_cond_says_stop
611 (const struct extension_language_defn *, struct breakpoint *b);
613 /* Initializers for each piece of Scheme support, in alphabetical order. */
615 extern void gdbscm_initialize_arches (void);
616 extern void gdbscm_initialize_auto_load (void);
617 extern void gdbscm_initialize_blocks (void);
618 extern void gdbscm_initialize_breakpoints (void);
619 extern void gdbscm_initialize_commands (void);
620 extern void gdbscm_initialize_disasm (void);
621 extern void gdbscm_initialize_exceptions (void);
622 extern void gdbscm_initialize_frames (void);
623 extern void gdbscm_initialize_iterators (void);
624 extern void gdbscm_initialize_lazy_strings (void);
625 extern void gdbscm_initialize_math (void);
626 extern void gdbscm_initialize_objfiles (void);
627 extern void gdbscm_initialize_pretty_printers (void);
628 extern void gdbscm_initialize_parameters (void);
629 extern void gdbscm_initialize_ports (void);
630 extern void gdbscm_initialize_pspaces (void);
631 extern void gdbscm_initialize_smobs (void);
632 extern void gdbscm_initialize_strings (void);
633 extern void gdbscm_initialize_symbols (void);
634 extern void gdbscm_initialize_symtabs (void);
635 extern void gdbscm_initialize_types (void);
636 extern void gdbscm_initialize_values (void);
639 /* A complication with the Guile code is that we have two types of
640 exceptions to consider. GDB/C++ exceptions, and Guile/SJLJ
641 exceptions. Code that is facing the Guile interpreter must not
642 throw GDB exceptions, instead Scheme exceptions must be thrown.
643 Also, because Guile exceptions are SJLJ based, Guile-facing code
644 must not use local objects with dtors, unless wrapped in a scope
645 with a TRY/CATCH, because the dtors won't otherwise be run when a
646 Guile exceptions is thrown. */
648 /* This is a destructor-less clone of gdb_exception. */
650 struct gdbscm_gdb_exception
652 enum return_reason reason;
654 /* The message is xmalloc'd. */
658 /* Return a gdbscm_gdb_exception representing EXC. */
660 inline gdbscm_gdb_exception
661 unpack (const gdb_exception &exc)
663 gdbscm_gdb_exception result;
664 result.reason = exc.reason;
665 result.error = exc.error;
666 if (exc.message == nullptr)
667 result.message = nullptr;
669 result.message = xstrdup (exc.message->c_str ());
670 /* The message should be NULL iff the reason is zero. */
671 gdb_assert ((result.reason == 0) == (result.message == nullptr));
675 /* Use this after a TRY/CATCH to throw the appropriate Scheme
676 exception if a GDB error occurred. */
678 #define GDBSCM_HANDLE_GDB_EXCEPTION(exception) \
680 if (exception.reason < 0) \
682 gdbscm_throw_gdb_exception (exception); \
687 /* Use this to wrap a callable to throw the appropriate Scheme
688 exception if the callable throws a GDB error. ARGS are forwarded
689 to FUNC. Returns the result of FUNC, unless FUNC returns a Scheme
690 exception, in which case that exception is thrown. Note that while
691 the callable is free to use objects of types with destructors,
692 because GDB errors are C++ exceptions, the caller of gdbscm_wrap
693 must not use such objects, because their destructors would not be
694 called when a Scheme exception is thrown. */
696 template<typename Function, typename... Args>
698 gdbscm_wrap (Function &&func, Args &&... args)
700 SCM result = SCM_BOOL_F;
701 gdbscm_gdb_exception exc {};
705 result = func (std::forward<Args> (args)...);
707 catch (const gdb_exception &except)
709 exc = unpack (except);
712 GDBSCM_HANDLE_GDB_EXCEPTION (exc);
714 if (gdbscm_is_exception (result))
715 gdbscm_throw (result);
720 #endif /* GUILE_GUILE_INTERNAL_H */