Commit | Line | Data |
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ab4f3efb | 1 | /* Printing of backtraces and error messages |
f93df18f | 2 | * Copyright (C) 1996,1997,1998,1999,2000,2001, 2003, 2004 Free Software Foundation |
ab4f3efb | 3 | * |
73be1d9e MV |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
ab4f3efb | 8 | * |
73be1d9e | 9 | * This library is distributed in the hope that it will be useful, |
ab4f3efb | 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | * Lesser General Public License for more details. | |
ab4f3efb | 13 | * |
73be1d9e MV |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
ab4f3efb | 18 | |
615873d2 RB |
19 | #if HAVE_CONFIG_H |
20 | # include <config.h> | |
21 | #endif | |
1bbd0b84 | 22 | |
7beabedb | 23 | #include <stdio.h> |
2b407f9b MD |
24 | #include <ctype.h> |
25 | ||
a0599745 | 26 | #include "libguile/_scm.h" |
2fb36297 | 27 | |
b1508ade MD |
28 | #ifdef HAVE_UNISTD_H |
29 | #include <unistd.h> | |
30 | #endif | |
82893676 MG |
31 | #ifdef HAVE_IO_H |
32 | #include <io.h> | |
33 | #endif | |
b1508ade | 34 | |
a0599745 MD |
35 | #include "libguile/stacks.h" |
36 | #include "libguile/srcprop.h" | |
37 | #include "libguile/struct.h" | |
38 | #include "libguile/strports.h" | |
39 | #include "libguile/throw.h" | |
40 | #include "libguile/fluids.h" | |
41 | #include "libguile/ports.h" | |
42 | #include "libguile/strings.h" | |
dfd03fb9 | 43 | #include "libguile/dynwind.h" |
ab4f3efb | 44 | |
a0599745 | 45 | #include "libguile/validate.h" |
af68e5e5 | 46 | #include "libguile/lang.h" |
a0599745 | 47 | #include "libguile/backtrace.h" |
fec097f0 | 48 | #include "libguile/filesys.h" |
ab4f3efb MD |
49 | |
50 | /* {Error reporting and backtraces} | |
ab4f3efb MD |
51 | * |
52 | * Note that these functions shouldn't generate errors themselves. | |
53 | */ | |
54 | ||
dfd03fb9 MD |
55 | /* Print parameters for error messages. */ |
56 | ||
57 | #define DISPLAY_ERROR_MESSAGE_MAX_LEVEL 7 | |
58 | #define DISPLAY_ERROR_MESSAGE_MAX_LENGTH 10 | |
59 | ||
60 | /* Print parameters for failing expressions in error messages. | |
61 | * (See also `print_params' below for backtrace print parameters.) | |
62 | */ | |
63 | ||
64 | #define DISPLAY_EXPRESSION_MAX_LEVEL 2 | |
65 | #define DISPLAY_EXPRESSION_MAX_LENGTH 3 | |
66 | ||
ab4f3efb MD |
67 | #undef SCM_ASSERT |
68 | #define SCM_ASSERT(_cond, _arg, _pos, _subr) \ | |
69 | if (!(_cond)) \ | |
70 | return SCM_BOOL_F; | |
ab4f3efb | 71 | |
86d31dfe | 72 | SCM scm_the_last_stack_fluid_var; |
b6609fc7 | 73 | |
ab4f3efb | 74 | static void |
1bbd0b84 | 75 | display_header (SCM source, SCM port) |
ab4f3efb | 76 | { |
2f2b390c | 77 | if (SCM_MEMOIZEDP (source)) |
ab4f3efb | 78 | { |
2f2b390c DH |
79 | SCM fname = scm_source_property (source, scm_sym_filename); |
80 | SCM line = scm_source_property (source, scm_sym_line); | |
81 | SCM col = scm_source_property (source, scm_sym_column); | |
82 | ||
83 | /* Dirk:FIXME:: Maybe we should store the _port_ rather than the | |
84 | * filename with the source properties? Then we could in case of | |
85 | * non-file ports give at least some more details than just | |
86 | * "<unnamed port>". */ | |
87 | if (SCM_STRINGP (fname)) | |
88 | scm_prin1 (fname, port, 0); | |
89 | else | |
90 | scm_puts ("<unnamed port>", port); | |
91 | ||
92 | if (!SCM_FALSEP (line) && !SCM_FALSEP (col)) | |
93 | { | |
94 | scm_putc (':', port); | |
95 | scm_intprint (SCM_INUM (line) + 1, 10, port); | |
96 | scm_putc (':', port); | |
97 | scm_intprint (SCM_INUM (col) + 1, 10, port); | |
98 | } | |
ab4f3efb MD |
99 | } |
100 | else | |
b7f3516f TT |
101 | scm_puts ("ERROR", port); |
102 | scm_puts (": ", port); | |
ab4f3efb MD |
103 | } |
104 | ||
f3acc5c1 | 105 | |
dfd03fb9 MD |
106 | struct display_error_message_data { |
107 | SCM message; | |
108 | SCM args; | |
109 | SCM port; | |
110 | scm_print_state *pstate; | |
111 | int old_fancyp; | |
112 | int old_level; | |
113 | int old_length; | |
114 | }; | |
115 | ||
116 | static SCM | |
117 | display_error_message (struct display_error_message_data *d) | |
118 | { | |
119 | if (SCM_STRINGP (d->message) && !SCM_FALSEP (scm_list_p (d->args))) | |
120 | scm_simple_format (d->port, d->message, d->args); | |
121 | else | |
122 | scm_display (d->message, d->port); | |
123 | scm_newline (d->port); | |
124 | return SCM_UNSPECIFIED; | |
125 | } | |
126 | ||
127 | static void | |
128 | before_display_error_message (struct display_error_message_data *d) | |
129 | { | |
130 | scm_print_state *pstate = d->pstate; | |
131 | d->old_fancyp = pstate->fancyp; | |
132 | d->old_level = pstate->level; | |
133 | d->old_length = pstate->length; | |
134 | pstate->fancyp = 1; | |
135 | pstate->level = DISPLAY_ERROR_MESSAGE_MAX_LEVEL; | |
136 | pstate->length = DISPLAY_ERROR_MESSAGE_MAX_LENGTH; | |
137 | } | |
138 | ||
139 | static void | |
140 | after_display_error_message (struct display_error_message_data *d) | |
141 | { | |
142 | scm_print_state *pstate = d->pstate; | |
143 | pstate->fancyp = d->old_fancyp; | |
144 | pstate->level = d->old_level; | |
145 | pstate->length = d->old_length; | |
146 | } | |
147 | ||
f3acc5c1 | 148 | void |
6e8d25a6 | 149 | scm_display_error_message (SCM message, SCM args, SCM port) |
ab4f3efb | 150 | { |
dfd03fb9 MD |
151 | struct display_error_message_data d; |
152 | SCM print_state; | |
153 | scm_print_state *pstate; | |
154 | ||
155 | port = scm_i_port_with_print_state (port, SCM_UNDEFINED); | |
156 | print_state = SCM_PORT_WITH_PS_PS (port); | |
157 | pstate = SCM_PRINT_STATE (print_state); | |
158 | ||
159 | d.message = message; | |
160 | d.args = args; | |
161 | d.port = port; | |
162 | d.pstate = pstate; | |
163 | scm_internal_dynamic_wind ((scm_t_guard) before_display_error_message, | |
164 | (scm_t_inner) display_error_message, | |
165 | (scm_t_guard) after_display_error_message, | |
166 | &d, | |
167 | &d); | |
ab4f3efb MD |
168 | } |
169 | ||
ab4f3efb | 170 | static void |
34d19ef6 | 171 | display_expression (SCM frame, SCM pname, SCM source, SCM port) |
ab4f3efb MD |
172 | { |
173 | SCM print_state = scm_make_print_state (); | |
174 | scm_print_state *pstate = SCM_PRINT_STATE (print_state); | |
175 | pstate->writingp = 0; | |
176 | pstate->fancyp = 1; | |
dfd03fb9 MD |
177 | pstate->level = DISPLAY_EXPRESSION_MAX_LEVEL; |
178 | pstate->length = DISPLAY_EXPRESSION_MAX_LENGTH; | |
b24b5e13 | 179 | if (SCM_SYMBOLP (pname) || SCM_STRINGP (pname)) |
ab4f3efb | 180 | { |
cabe682c | 181 | if (SCM_FRAMEP (frame) |
ab4f3efb | 182 | && SCM_FRAME_EVAL_ARGS_P (frame)) |
b7f3516f | 183 | scm_puts ("While evaluating arguments to ", port); |
ab4f3efb | 184 | else |
b7f3516f | 185 | scm_puts ("In procedure ", port); |
ab4f3efb | 186 | scm_iprin1 (pname, port, pstate); |
0c95b57d | 187 | if (SCM_MEMOIZEDP (source)) |
ab4f3efb | 188 | { |
b7f3516f | 189 | scm_puts (" in expression ", port); |
ab4f3efb | 190 | pstate->writingp = 1; |
9fcf3cbb | 191 | scm_iprin1 (scm_i_unmemoize_expr (source), port, pstate); |
ab4f3efb MD |
192 | } |
193 | } | |
5843e5c9 | 194 | else if (SCM_MEMOIZEDP (source)) |
ab4f3efb | 195 | { |
b7f3516f | 196 | scm_puts ("In expression ", port); |
ab4f3efb | 197 | pstate->writingp = 1; |
9fcf3cbb | 198 | scm_iprin1 (scm_i_unmemoize_expr (source), port, pstate); |
ab4f3efb | 199 | } |
b7f3516f | 200 | scm_puts (":\n", port); |
ab4f3efb MD |
201 | scm_free_print_state (print_state); |
202 | } | |
203 | ||
bdf8afff MD |
204 | struct display_error_args { |
205 | SCM stack; | |
206 | SCM port; | |
207 | SCM subr; | |
208 | SCM message; | |
209 | SCM args; | |
210 | SCM rest; | |
211 | }; | |
212 | ||
213 | static SCM | |
39752bec | 214 | display_error_body (struct display_error_args *a) |
ab4f3efb MD |
215 | { |
216 | SCM current_frame = SCM_BOOL_F; | |
217 | SCM source = SCM_BOOL_F; | |
a88a4c8a | 218 | SCM prev_frame = SCM_BOOL_F; |
b24b5e13 | 219 | SCM pname = a->subr; |
a88a4c8a | 220 | |
434f2f7a | 221 | if (scm_debug_mode_p |
bdf8afff MD |
222 | && SCM_STACKP (a->stack) |
223 | && SCM_STACK_LENGTH (a->stack) > 0) | |
ab4f3efb | 224 | { |
bdf8afff | 225 | current_frame = scm_stack_ref (a->stack, SCM_INUM0); |
ab4f3efb | 226 | source = SCM_FRAME_SOURCE (current_frame); |
a88a4c8a | 227 | prev_frame = SCM_FRAME_PREV (current_frame); |
cffcab30 | 228 | if (!SCM_MEMOIZEDP (source) && !SCM_FALSEP (prev_frame)) |
a88a4c8a | 229 | source = SCM_FRAME_SOURCE (prev_frame); |
b24b5e13 | 230 | if (!SCM_SYMBOLP (pname) && !SCM_STRINGP (pname) && SCM_FRAME_PROC_P (current_frame) |
9a09deb1 | 231 | && SCM_EQ_P (scm_procedure_p (SCM_FRAME_PROC (current_frame)), SCM_BOOL_T)) |
ab4f3efb MD |
232 | pname = scm_procedure_name (SCM_FRAME_PROC (current_frame)); |
233 | } | |
b24b5e13 | 234 | if (SCM_SYMBOLP (pname) || SCM_STRINGP (pname) || SCM_MEMOIZEDP (source)) |
ab4f3efb | 235 | { |
bdf8afff MD |
236 | display_header (source, a->port); |
237 | display_expression (current_frame, pname, source, a->port); | |
ab4f3efb | 238 | } |
bdf8afff MD |
239 | display_header (source, a->port); |
240 | scm_display_error_message (a->message, a->args, a->port); | |
241 | return SCM_UNSPECIFIED; | |
242 | } | |
243 | ||
244 | struct display_error_handler_data { | |
245 | char *mode; | |
246 | SCM port; | |
247 | }; | |
248 | ||
249 | /* This is the exception handler for error reporting routines. | |
250 | Note that it is very important that this handler *doesn't* try to | |
251 | print more than the error tag, since the error very probably is | |
252 | caused by an erroneous print call-back routine. If we would | |
2fdcf8bd | 253 | try to print all objects, we would enter an infinite loop. */ |
bdf8afff MD |
254 | static SCM |
255 | display_error_handler (struct display_error_handler_data *data, | |
e81d98ec | 256 | SCM tag, SCM args SCM_UNUSED) |
bdf8afff MD |
257 | { |
258 | SCM print_state = scm_make_print_state (); | |
b7f3516f TT |
259 | scm_puts ("\nException during displaying of ", data->port); |
260 | scm_puts (data->mode, data->port); | |
261 | scm_puts (": ", data->port); | |
bdf8afff | 262 | scm_iprin1 (tag, data->port, SCM_PRINT_STATE (print_state)); |
b7f3516f | 263 | scm_putc ('\n', data->port); |
bdf8afff MD |
264 | return SCM_UNSPECIFIED; |
265 | } | |
266 | ||
e40a4095 DH |
267 | |
268 | /* The function scm_i_display_error prints out a detailed error message. This | |
269 | * function will be called directly within libguile to signal error messages. | |
270 | * No parameter checks will be performed by scm_i_display_error. Thus, User | |
271 | * code should rather use the function scm_display_error. | |
272 | */ | |
273 | void | |
274 | scm_i_display_error (SCM stack, SCM port, SCM subr, SCM message, SCM args, SCM rest) | |
bdf8afff | 275 | { |
0b2cb4ee MD |
276 | struct display_error_args a; |
277 | struct display_error_handler_data data; | |
278 | a.stack = stack; | |
279 | a.port = port; | |
280 | a.subr = subr; | |
281 | a.message = message; | |
282 | a.args = args; | |
283 | a.rest = rest; | |
284 | data.mode = "error"; | |
285 | data.port = port; | |
bdf8afff | 286 | scm_internal_catch (SCM_BOOL_T, |
92c2555f MV |
287 | (scm_t_catch_body) display_error_body, &a, |
288 | (scm_t_catch_handler) display_error_handler, &data); | |
e40a4095 DH |
289 | } |
290 | ||
291 | ||
292 | SCM_DEFINE (scm_display_error, "display-error", 6, 0, 0, | |
293 | (SCM stack, SCM port, SCM subr, SCM message, SCM args, SCM rest), | |
c73bdd3a MG |
294 | "Display an error message to the output port @var{port}.\n" |
295 | "@var{stack} is the saved stack for the error, @var{subr} is\n" | |
bb2c02f2 | 296 | "the name of the procedure in which the error occurred and\n" |
c73bdd3a MG |
297 | "@var{message} is the actual error message, which may contain\n" |
298 | "formatting instructions. These will format the arguments in\n" | |
299 | "the list @var{args} accordingly. @var{rest} is currently\n" | |
300 | "ignored.") | |
e40a4095 DH |
301 | #define FUNC_NAME s_scm_display_error |
302 | { | |
303 | SCM_VALIDATE_OUTPUT_PORT (2, port); | |
304 | ||
305 | scm_i_display_error (stack, port, subr, message, args, rest); | |
306 | ||
ab4f3efb MD |
307 | return SCM_UNSPECIFIED; |
308 | } | |
1bbd0b84 | 309 | #undef FUNC_NAME |
ab4f3efb | 310 | |
e40a4095 | 311 | |
2b407f9b MD |
312 | typedef struct { |
313 | int level; | |
314 | int length; | |
315 | } print_params_t; | |
316 | ||
317 | static int n_print_params = 9; | |
318 | static print_params_t default_print_params[] = { | |
319 | { 4, 9 }, { 4, 3 }, | |
320 | { 3, 4 }, { 3, 3 }, | |
321 | { 2, 4 }, { 2, 3 }, | |
322 | { 1, 4 }, { 1, 3 }, { 1, 2 } | |
323 | }; | |
324 | static print_params_t *print_params = default_print_params; | |
325 | ||
326 | #ifdef GUILE_DEBUG | |
3b3b36dd | 327 | SCM_DEFINE (scm_set_print_params_x, "set-print-params!", 1, 0, 0, |
5623a9b4 | 328 | (SCM params), |
c73bdd3a MG |
329 | "Set the print parameters to the values from @var{params}.\n" |
330 | "@var{params} must be a list of two-element lists which must\n" | |
331 | "hold two integer values.") | |
e8e9b690 | 332 | #define FUNC_NAME s_scm_set_print_params_x |
2b407f9b | 333 | { |
3fceef59 MD |
334 | int i; |
335 | int n; | |
2b407f9b MD |
336 | SCM ls; |
337 | print_params_t *new_params; | |
3fceef59 MD |
338 | |
339 | SCM_VALIDATE_NONEMPTYLIST_COPYLEN (2, params, n); | |
c96d76b8 | 340 | for (ls = params; !SCM_NULL_OR_NIL_P (ls); ls = SCM_CDR (ls)) |
2b407f9b MD |
341 | SCM_ASSERT (scm_ilength (SCM_CAR (params)) == 2 |
342 | && SCM_INUMP (SCM_CAAR (ls)) | |
343 | && SCM_INUM (SCM_CAAR (ls)) >= 0 | |
344 | && SCM_INUMP (SCM_CADAR (ls)) | |
345 | && SCM_INUM (SCM_CADAR (ls)) >= 0, | |
346 | params, | |
347 | SCM_ARG2, | |
e8e9b690 | 348 | s_scm_set_print_params_x); |
4c9419ac | 349 | new_params = scm_malloc (n * sizeof (print_params_t)); |
2b407f9b | 350 | if (print_params != default_print_params) |
4c9419ac | 351 | free (print_params); |
2b407f9b MD |
352 | print_params = new_params; |
353 | for (i = 0; i < n; ++i) | |
354 | { | |
355 | print_params[i].level = SCM_INUM (SCM_CAAR (params)); | |
356 | print_params[i].length = SCM_INUM (SCM_CADAR (params)); | |
357 | params = SCM_CDR (params); | |
358 | } | |
359 | n_print_params = n; | |
360 | return SCM_UNSPECIFIED; | |
361 | } | |
1bbd0b84 | 362 | #undef FUNC_NAME |
2b407f9b MD |
363 | #endif |
364 | ||
ab4f3efb | 365 | static void |
1bbd0b84 | 366 | indent (int n, SCM port) |
ab4f3efb MD |
367 | { |
368 | int i; | |
369 | for (i = 0; i < n; ++i) | |
b7f3516f | 370 | scm_putc (' ', port); |
ab4f3efb MD |
371 | } |
372 | ||
ab4f3efb | 373 | static void |
34d19ef6 | 374 | display_frame_expr (char *hdr, SCM exp, char *tlr, int indentation, SCM sport, SCM port, scm_print_state *pstate) |
ab4f3efb | 375 | { |
2b407f9b MD |
376 | SCM string; |
377 | int i = 0, n; | |
92c2555f | 378 | scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (sport); |
2b407f9b | 379 | do |
ab4f3efb | 380 | { |
2b407f9b MD |
381 | pstate->length = print_params[i].length; |
382 | ptob->seek (sport, 0, SEEK_SET); | |
0c95b57d | 383 | if (SCM_CONSP (exp)) |
2b407f9b MD |
384 | { |
385 | pstate->level = print_params[i].level - 1; | |
386 | scm_iprlist (hdr, exp, tlr[0], sport, pstate); | |
387 | scm_puts (&tlr[1], sport); | |
388 | } | |
389 | else | |
390 | { | |
391 | pstate->level = print_params[i].level; | |
392 | scm_iprin1 (exp, sport, pstate); | |
393 | } | |
394 | ptob->flush (sport); | |
395 | n = ptob->seek (sport, 0, SEEK_CUR); | |
396 | ++i; | |
ab4f3efb | 397 | } |
2b407f9b MD |
398 | while (indentation + n > SCM_BACKTRACE_WIDTH && i < n_print_params); |
399 | ptob->truncate (sport, n); | |
400 | string = scm_strport_to_string (sport); | |
401 | /* Remove control characters */ | |
402 | for (i = 0; i < n; ++i) | |
f93df18f | 403 | if (iscntrl ((int) (unsigned char) SCM_STRING_CHARS (string)[i])) |
86c991c2 | 404 | SCM_STRING_CHARS (string)[i] = ' '; |
2b407f9b MD |
405 | /* Truncate */ |
406 | if (indentation + n > SCM_BACKTRACE_WIDTH) | |
407 | { | |
408 | n = SCM_BACKTRACE_WIDTH - indentation; | |
86c991c2 | 409 | SCM_STRING_CHARS (string)[n - 1] = '$'; |
2b407f9b MD |
410 | } |
411 | ||
86c991c2 | 412 | scm_lfwrite (SCM_STRING_CHARS (string), n, port); |
ab4f3efb MD |
413 | } |
414 | ||
e3c37929 | 415 | static void |
34d19ef6 | 416 | display_application (SCM frame, int indentation, SCM sport, SCM port, scm_print_state *pstate) |
e3c37929 MD |
417 | { |
418 | SCM proc = SCM_FRAME_PROC (frame); | |
5843e5c9 | 419 | SCM name = (!SCM_FALSEP (scm_procedure_p (proc)) |
e3c37929 MD |
420 | ? scm_procedure_name (proc) |
421 | : SCM_BOOL_F); | |
422 | display_frame_expr ("[", | |
5843e5c9 | 423 | scm_cons (!SCM_FALSEP (name) ? name : proc, |
e3c37929 MD |
424 | SCM_FRAME_ARGS (frame)), |
425 | SCM_FRAME_EVAL_ARGS_P (frame) ? " ..." : "]", | |
426 | indentation, | |
427 | sport, | |
428 | port, | |
429 | pstate); | |
430 | } | |
431 | ||
3b3b36dd | 432 | SCM_DEFINE (scm_display_application, "display-application", 1, 2, 0, |
1bbd0b84 | 433 | (SCM frame, SCM port, SCM indent), |
c73bdd3a MG |
434 | "Display a procedure application @var{frame} to the output port\n" |
435 | "@var{port}. @var{indent} specifies the indentation of the\n" | |
436 | "output.") | |
1bbd0b84 | 437 | #define FUNC_NAME s_scm_display_application |
e3c37929 | 438 | { |
34d19ef6 | 439 | SCM_VALIDATE_FRAME (1, frame); |
e3c37929 MD |
440 | if (SCM_UNBNDP (port)) |
441 | port = scm_cur_outp; | |
2b407f9b | 442 | else |
34d19ef6 | 443 | SCM_VALIDATE_OPOUTPORT (2, port); |
2b407f9b MD |
444 | if (SCM_UNBNDP (indent)) |
445 | indent = SCM_INUM0; | |
446 | else | |
34d19ef6 | 447 | SCM_VALIDATE_INUM (3, indent); |
2b407f9b | 448 | |
e3c37929 MD |
449 | if (SCM_FRAME_PROC_P (frame)) |
450 | /* Display an application. */ | |
451 | { | |
2b407f9b | 452 | SCM sport, print_state; |
e3c37929 MD |
453 | scm_print_state *pstate; |
454 | ||
2b407f9b MD |
455 | /* Create a string port used for adaptation of printing parameters. */ |
456 | sport = scm_mkstrport (SCM_INUM0, | |
457 | scm_make_string (SCM_MAKINUM (240), | |
458 | SCM_UNDEFINED), | |
459 | SCM_OPN | SCM_WRTNG, | |
1bbd0b84 | 460 | FUNC_NAME); |
2b407f9b | 461 | |
e3c37929 MD |
462 | /* Create a print state for printing of frames. */ |
463 | print_state = scm_make_print_state (); | |
464 | pstate = SCM_PRINT_STATE (print_state); | |
465 | pstate->writingp = 1; | |
466 | pstate->fancyp = 1; | |
e3c37929 | 467 | |
2b407f9b | 468 | display_application (frame, SCM_INUM (indent), sport, port, pstate); |
e3c37929 MD |
469 | return SCM_BOOL_T; |
470 | } | |
471 | else | |
472 | return SCM_BOOL_F; | |
473 | } | |
1bbd0b84 | 474 | #undef FUNC_NAME |
e3c37929 | 475 | |
fec097f0 MV |
476 | SCM_SYMBOL (sym_base, "base"); |
477 | ||
478 | static void | |
479 | display_backtrace_get_file_line (SCM frame, SCM *file, SCM *line) | |
480 | { | |
481 | SCM source = SCM_FRAME_SOURCE (frame); | |
482 | *file = SCM_MEMOIZEDP (source) ? scm_source_property (source, scm_sym_filename) : SCM_BOOL_F; | |
483 | *line = (SCM_MEMOIZEDP (source)) ? scm_source_property (source, scm_sym_line) : SCM_BOOL_F; | |
484 | } | |
485 | ||
486 | static void | |
487 | display_backtrace_file (frame, last_file, port, pstate) | |
488 | SCM frame; | |
489 | SCM *last_file; | |
490 | SCM port; | |
491 | scm_print_state *pstate; | |
492 | { | |
493 | SCM file, line; | |
494 | ||
495 | display_backtrace_get_file_line (frame, &file, &line); | |
496 | ||
c3c4d801 | 497 | if (SCM_EQ_P (file, *last_file)) |
fec097f0 MV |
498 | return; |
499 | ||
500 | *last_file = file; | |
501 | ||
502 | scm_puts ("In ", port); | |
c3c4d801 DH |
503 | if (SCM_FALSEP (file)) |
504 | if (SCM_FALSEP (line)) | |
fec097f0 MV |
505 | scm_puts ("unknown file", port); |
506 | else | |
507 | scm_puts ("current input", port); | |
508 | else | |
509 | { | |
510 | pstate->writingp = 0; | |
511 | scm_iprin1 (file, port, pstate); | |
512 | pstate->writingp = 1; | |
513 | } | |
514 | scm_puts (":\n", port); | |
515 | } | |
516 | ||
517 | static void | |
518 | display_backtrace_file_and_line (SCM frame, SCM port, scm_print_state *pstate) | |
519 | { | |
520 | SCM file, line; | |
521 | ||
522 | display_backtrace_get_file_line (frame, &file, &line); | |
523 | ||
702551e6 | 524 | if (SCM_EQ_P (SCM_PACK (SCM_SHOW_FILE_NAME), sym_base)) |
fec097f0 | 525 | { |
c3c4d801 | 526 | if (SCM_FALSEP (file)) |
fec097f0 | 527 | { |
c3c4d801 | 528 | if (SCM_FALSEP (line)) |
fec097f0 MV |
529 | scm_putc ('?', port); |
530 | else | |
531 | scm_puts ("<stdin>", port); | |
532 | } | |
533 | else | |
534 | { | |
535 | pstate -> writingp = 0; | |
4110fa69 | 536 | #ifdef HAVE_POSIX |
fec097f0 MV |
537 | scm_iprin1 (SCM_STRINGP (file) ? scm_basename (file, SCM_UNDEFINED) : file, |
538 | port, pstate); | |
4110fa69 MV |
539 | #else |
540 | scm_iprin1 (file, port, pstate); | |
541 | #endif | |
fec097f0 MV |
542 | pstate -> writingp = 1; |
543 | } | |
544 | ||
545 | scm_putc (':', port); | |
546 | } | |
c3c4d801 | 547 | else if (!SCM_FALSEP (line)) |
fec097f0 MV |
548 | { |
549 | int i, j=0; | |
550 | for (i = SCM_INUM (line)+1; i > 0; i = i/10, j++) | |
551 | ; | |
552 | indent (4-j, port); | |
553 | } | |
554 | ||
c3c4d801 | 555 | if (SCM_FALSEP (line)) |
fec097f0 MV |
556 | scm_puts (" ?", port); |
557 | else | |
558 | scm_intprint (SCM_INUM (line) + 1, 10, port); | |
559 | scm_puts (": ", port); | |
560 | } | |
561 | ||
ab4f3efb | 562 | static void |
34d19ef6 | 563 | display_frame (SCM frame, int nfield, int indentation, SCM sport, SCM port, scm_print_state *pstate) |
ab4f3efb MD |
564 | { |
565 | int n, i, j; | |
566 | ||
567 | /* Announce missing frames? */ | |
568 | if (!SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
569 | { | |
570 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 571 | scm_puts ("...\n", port); |
ab4f3efb MD |
572 | } |
573 | ||
fec097f0 | 574 | /* display file name and line number */ |
702551e6 | 575 | if (!SCM_FALSEP (SCM_PACK (SCM_SHOW_FILE_NAME))) |
fec097f0 MV |
576 | display_backtrace_file_and_line (frame, port, pstate); |
577 | ||
ab4f3efb MD |
578 | /* Check size of frame number. */ |
579 | n = SCM_FRAME_NUMBER (frame); | |
580 | for (i = 0, j = n; j > 0; ++i) j /= 10; | |
581 | ||
582 | /* Number indentation. */ | |
583 | indent (nfield - (i ? i : 1), port); | |
584 | ||
585 | /* Frame number. */ | |
586 | scm_iprin1 (SCM_MAKINUM (n), port, pstate); | |
587 | ||
588 | /* Real frame marker */ | |
b7f3516f | 589 | scm_putc (SCM_FRAME_REAL_P (frame) ? '*' : ' ', port); |
ab4f3efb MD |
590 | |
591 | /* Indentation. */ | |
592 | indent (indentation, port); | |
593 | ||
594 | if (SCM_FRAME_PROC_P (frame)) | |
595 | /* Display an application. */ | |
e3c37929 | 596 | display_application (frame, nfield + 1 + indentation, sport, port, pstate); |
ab4f3efb MD |
597 | else |
598 | /* Display a special form. */ | |
599 | { | |
600 | SCM source = SCM_FRAME_SOURCE (frame); | |
0c95b57d | 601 | SCM copy = (SCM_CONSP (source) |
7f2d92b1 | 602 | ? scm_source_property (source, scm_sym_copy) |
2e9d6c6d | 603 | : SCM_BOOL_F); |
0c95b57d | 604 | SCM umcopy = (SCM_MEMOIZEDP (source) |
9fcf3cbb | 605 | ? scm_i_unmemoize_expr (source) |
2e9d6c6d | 606 | : SCM_BOOL_F); |
ab4f3efb | 607 | display_frame_expr ("(", |
0c95b57d | 608 | SCM_CONSP (copy) ? copy : umcopy, |
ab4f3efb MD |
609 | ")", |
610 | nfield + 1 + indentation, | |
611 | sport, | |
612 | port, | |
613 | pstate); | |
614 | } | |
1ae6af28 | 615 | scm_putc ('\n', port); |
ab4f3efb MD |
616 | |
617 | /* Announce missing frames? */ | |
618 | if (SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
619 | { | |
620 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 621 | scm_puts ("...\n", port); |
ab4f3efb MD |
622 | } |
623 | } | |
624 | ||
bdf8afff MD |
625 | struct display_backtrace_args { |
626 | SCM stack; | |
627 | SCM port; | |
628 | SCM first; | |
629 | SCM depth; | |
630 | }; | |
631 | ||
bdf8afff | 632 | static SCM |
5843e5c9 | 633 | display_backtrace_body (struct display_backtrace_args *a) |
1bbd0b84 | 634 | #define FUNC_NAME "display_backtrace_body" |
ab4f3efb MD |
635 | { |
636 | int n_frames, beg, end, n, i, j; | |
637 | int nfield, indent_p, indentation; | |
638 | SCM frame, sport, print_state; | |
fec097f0 | 639 | SCM last_file; |
ab4f3efb MD |
640 | scm_print_state *pstate; |
641 | ||
78446828 MV |
642 | a->port = SCM_COERCE_OUTPORT (a->port); |
643 | ||
ab4f3efb | 644 | /* Argument checking and extraction. */ |
5843e5c9 DH |
645 | SCM_VALIDATE_STACK (1, a->stack); |
646 | SCM_VALIDATE_OPOUTPORT (2, a->port); | |
bdf8afff MD |
647 | n_frames = SCM_INUM (scm_stack_length (a->stack)); |
648 | n = SCM_INUMP (a->depth) ? SCM_INUM (a->depth) : SCM_BACKTRACE_DEPTH; | |
ab4f3efb MD |
649 | if (SCM_BACKWARDS_P) |
650 | { | |
bdf8afff | 651 | beg = SCM_INUMP (a->first) ? SCM_INUM (a->first) : 0; |
ab4f3efb MD |
652 | end = beg + n - 1; |
653 | if (end >= n_frames) | |
654 | end = n_frames - 1; | |
655 | n = end - beg + 1; | |
656 | } | |
657 | else | |
658 | { | |
bdf8afff | 659 | if (SCM_INUMP (a->first)) |
ab4f3efb | 660 | { |
bdf8afff | 661 | beg = SCM_INUM (a->first); |
ab4f3efb MD |
662 | end = beg - n + 1; |
663 | if (end < 0) | |
664 | end = 0; | |
665 | } | |
666 | else | |
667 | { | |
668 | beg = n - 1; | |
669 | end = 0; | |
670 | if (beg >= n_frames) | |
671 | beg = n_frames - 1; | |
672 | } | |
673 | n = beg - end + 1; | |
674 | } | |
bdf8afff MD |
675 | SCM_ASSERT (beg >= 0 && beg < n_frames, a->first, SCM_ARG3, s_display_backtrace); |
676 | SCM_ASSERT (n > 0, a->depth, SCM_ARG4, s_display_backtrace); | |
ab4f3efb MD |
677 | |
678 | /* Create a string port used for adaptation of printing parameters. */ | |
679 | sport = scm_mkstrport (SCM_INUM0, | |
680 | scm_make_string (SCM_MAKINUM (240), SCM_UNDEFINED), | |
681 | SCM_OPN | SCM_WRTNG, | |
1bbd0b84 | 682 | FUNC_NAME); |
ab4f3efb MD |
683 | |
684 | /* Create a print state for printing of frames. */ | |
685 | print_state = scm_make_print_state (); | |
686 | pstate = SCM_PRINT_STATE (print_state); | |
687 | pstate->writingp = 1; | |
688 | pstate->fancyp = 1; | |
689 | ||
690 | /* First find out if it's reasonable to do indentation. */ | |
691 | if (SCM_BACKWARDS_P) | |
692 | indent_p = 0; | |
693 | else | |
694 | { | |
5843e5c9 DH |
695 | unsigned int j; |
696 | ||
ab4f3efb | 697 | indent_p = 1; |
bdf8afff | 698 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb MD |
699 | for (i = 0, j = 0; i < n; ++i) |
700 | { | |
701 | if (SCM_FRAME_REAL_P (frame)) | |
702 | ++j; | |
703 | if (j > SCM_BACKTRACE_INDENT) | |
704 | { | |
705 | indent_p = 0; | |
706 | break; | |
707 | } | |
708 | frame = (SCM_BACKWARDS_P | |
709 | ? SCM_FRAME_PREV (frame) | |
710 | : SCM_FRAME_NEXT (frame)); | |
711 | } | |
712 | } | |
713 | ||
714 | /* Determine size of frame number field. */ | |
bdf8afff | 715 | j = SCM_FRAME_NUMBER (scm_stack_ref (a->stack, SCM_MAKINUM (end))); |
ab4f3efb MD |
716 | for (i = 0; j > 0; ++i) j /= 10; |
717 | nfield = i ? i : 1; | |
718 | ||
ab4f3efb | 719 | /* Print frames. */ |
bdf8afff | 720 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb | 721 | indentation = 1; |
fec097f0 MV |
722 | last_file = SCM_UNDEFINED; |
723 | for (i = 0; i < n; ++i) | |
ab4f3efb | 724 | { |
702551e6 | 725 | if (!SCM_EQ_P (SCM_PACK (SCM_SHOW_FILE_NAME), sym_base)) |
fec097f0 MV |
726 | display_backtrace_file (frame, &last_file, a->port, pstate); |
727 | ||
728 | display_frame (frame, nfield, indentation, sport, a->port, pstate); | |
ab4f3efb MD |
729 | if (indent_p && SCM_FRAME_EVAL_ARGS_P (frame)) |
730 | ++indentation; | |
fec097f0 MV |
731 | frame = (SCM_BACKWARDS_P ? |
732 | SCM_FRAME_PREV (frame) : SCM_FRAME_NEXT (frame)); | |
ab4f3efb | 733 | } |
bdf8afff | 734 | |
463b2219 ML |
735 | scm_remember_upto_here_1 (print_state); |
736 | ||
bdf8afff MD |
737 | return SCM_UNSPECIFIED; |
738 | } | |
1bbd0b84 | 739 | #undef FUNC_NAME |
bdf8afff | 740 | |
3b3b36dd | 741 | SCM_DEFINE (scm_display_backtrace, "display-backtrace", 2, 2, 0, |
c73bdd3a MG |
742 | (SCM stack, SCM port, SCM first, SCM depth), |
743 | "Display a backtrace to the output port @var{port}. @var{stack}\n" | |
744 | "is the stack to take the backtrace from, @var{first} specifies\n" | |
745 | "where in the stack to start and @var{depth} how much frames\n" | |
746 | "to display. Both @var{first} and @var{depth} can be @code{#f},\n" | |
747 | "which means that default values will be used.") | |
1bbd0b84 | 748 | #define FUNC_NAME s_scm_display_backtrace |
bdf8afff | 749 | { |
0b2cb4ee MD |
750 | struct display_backtrace_args a; |
751 | struct display_error_handler_data data; | |
752 | a.stack = stack; | |
753 | a.port = port; | |
754 | a.first = first; | |
755 | a.depth = depth; | |
756 | data.mode = "backtrace"; | |
757 | data.port = port; | |
bdf8afff | 758 | scm_internal_catch (SCM_BOOL_T, |
92c2555f MV |
759 | (scm_t_catch_body) display_backtrace_body, &a, |
760 | (scm_t_catch_handler) display_error_handler, &data); | |
ab4f3efb MD |
761 | return SCM_UNSPECIFIED; |
762 | } | |
1bbd0b84 | 763 | #undef FUNC_NAME |
ab4f3efb | 764 | |
86d31dfe | 765 | SCM_VARIABLE (scm_has_shown_backtrace_hint_p_var, "has-shown-backtrace-hint?"); |
5aab5d96 | 766 | |
3b3b36dd | 767 | SCM_DEFINE (scm_backtrace, "backtrace", 0, 0, 0, |
c73bdd3a MG |
768 | (), |
769 | "Display a backtrace of the stack saved by the last error\n" | |
770 | "to the current output port.") | |
1bbd0b84 | 771 | #define FUNC_NAME s_scm_backtrace |
5aab5d96 | 772 | { |
86d31dfe MV |
773 | SCM the_last_stack = |
774 | scm_fluid_ref (SCM_VARIABLE_REF (scm_the_last_stack_fluid_var)); | |
5843e5c9 | 775 | if (!SCM_FALSEP (the_last_stack)) |
5aab5d96 MD |
776 | { |
777 | scm_newline (scm_cur_outp); | |
3a1f8447 | 778 | scm_puts ("Backtrace:\n", scm_cur_outp); |
a5d6d578 | 779 | scm_display_backtrace (the_last_stack, |
5aab5d96 MD |
780 | scm_cur_outp, |
781 | SCM_UNDEFINED, | |
782 | SCM_UNDEFINED); | |
783 | scm_newline (scm_cur_outp); | |
86d31dfe | 784 | if (SCM_FALSEP (SCM_VARIABLE_REF (scm_has_shown_backtrace_hint_p_var)) |
5aab5d96 MD |
785 | && !SCM_BACKTRACE_P) |
786 | { | |
b7f3516f TT |
787 | scm_puts ("Type \"(debug-enable 'backtrace)\" if you would like " |
788 | "a backtrace\n" | |
789 | "automatically if an error occurs in the future.\n", | |
790 | scm_cur_outp); | |
86d31dfe | 791 | SCM_VARIABLE_SET (scm_has_shown_backtrace_hint_p_var, SCM_BOOL_T); |
5aab5d96 MD |
792 | } |
793 | } | |
794 | else | |
795 | { | |
b7f3516f | 796 | scm_puts ("No backtrace available.\n", scm_cur_outp); |
5aab5d96 MD |
797 | } |
798 | return SCM_UNSPECIFIED; | |
799 | } | |
1bbd0b84 | 800 | #undef FUNC_NAME |
5aab5d96 | 801 | |
ab4f3efb MD |
802 | \f |
803 | ||
804 | void | |
805 | scm_init_backtrace () | |
806 | { | |
a5d6d578 | 807 | SCM f = scm_make_fluid (); |
86d31dfe | 808 | scm_the_last_stack_fluid_var = scm_c_define ("the-last-stack", f); |
5aab5d96 | 809 | |
a0599745 | 810 | #include "libguile/backtrace.x" |
ab4f3efb | 811 | } |
89e00824 ML |
812 | |
813 | /* | |
814 | Local Variables: | |
815 | c-file-style: "gnu" | |
816 | End: | |
817 | */ |