Rephrase error message in infcall.c:call_function_by_hand
[deliverable/binutils-gdb.git] / gdb / python / py-prettyprint.c
CommitLineData
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1/* Python pretty-printing
2
7b6bb8da 3 Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
a6bac58e
TT
4
5 This file is part of GDB.
6
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.
11
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.
16
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/>. */
19
20#include "defs.h"
21#include "exceptions.h"
22#include "objfiles.h"
23#include "symtab.h"
24#include "language.h"
25#include "valprint.h"
6bf0ce2b 26
a6bac58e 27#include "python.h"
a6bac58e
TT
28
29#ifdef HAVE_PYTHON
6bf0ce2b
PP
30#include "python-internal.h"
31
621c8364
TT
32/* Return type of print_string_repr. */
33
34enum string_repr_result
35 {
36 /* The string method returned None. */
37 string_repr_none,
38 /* The string method had an error. */
39 string_repr_error,
40 /* Everything ok. */
41 string_repr_ok
42 };
43
a6bac58e
TT
44/* Helper function for find_pretty_printer which iterates over a list,
45 calls each function and inspects output. This will return a
46 printer object if one recognizes VALUE. If no printer is found, it
47 will return None. On error, it will set the Python error and
48 return NULL. */
fa33c3cd 49
a6bac58e
TT
50static PyObject *
51search_pp_list (PyObject *list, PyObject *value)
52{
53 Py_ssize_t pp_list_size, list_index;
54 PyObject *function, *printer = NULL;
55
56 pp_list_size = PyList_Size (list);
57 for (list_index = 0; list_index < pp_list_size; list_index++)
58 {
59 function = PyList_GetItem (list, list_index);
60 if (! function)
61 return NULL;
62
967cf477 63 /* Skip if disabled. */
1bdb0c54
TT
64 if (PyObject_HasAttr (function, gdbpy_enabled_cst))
65 {
66 PyObject *attr = PyObject_GetAttr (function, gdbpy_enabled_cst);
67 int cmp;
68
69 if (!attr)
70 return NULL;
71 cmp = PyObject_IsTrue (attr);
72 if (cmp == -1)
73 return NULL;
74
75 if (!cmp)
76 continue;
77 }
967cf477 78
a6bac58e
TT
79 printer = PyObject_CallFunctionObjArgs (function, value, NULL);
80 if (! printer)
81 return NULL;
82 else if (printer != Py_None)
83 return printer;
84
85 Py_DECREF (printer);
86 }
87
88 Py_RETURN_NONE;
89}
90
fa33c3cd
DE
91/* Subroutine of find_pretty_printer to simplify it.
92 Look for a pretty-printer to print VALUE in all objfiles.
93 The result is NULL if there's an error and the search should be terminated.
94 The result is Py_None, suitably inc-ref'd, if no pretty-printer was found.
95 Otherwise the result is the pretty-printer function, suitably inc-ref'd. */
96
a6bac58e 97static PyObject *
fa33c3cd 98find_pretty_printer_from_objfiles (PyObject *value)
a6bac58e 99{
fa33c3cd
DE
100 PyObject *pp_list;
101 PyObject *function;
a6bac58e 102 struct objfile *obj;
a6bac58e 103
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TT
104 ALL_OBJFILES (obj)
105 {
106 PyObject *objf = objfile_to_objfile_object (obj);
107 if (!objf)
108 {
109 /* Ignore the error and continue. */
110 PyErr_Clear ();
111 continue;
112 }
113
114 pp_list = objfpy_get_printers (objf, NULL);
115 function = search_pp_list (pp_list, value);
fa33c3cd 116 Py_XDECREF (pp_list);
a6bac58e 117
fa33c3cd 118 /* If there is an error in any objfile list, abort the search and exit. */
a6bac58e 119 if (! function)
fa33c3cd 120 return NULL;
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121
122 if (function != Py_None)
fa33c3cd 123 return function;
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124
125 Py_DECREF (function);
a6bac58e
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126 }
127
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128 Py_RETURN_NONE;
129}
130
131/* Subroutine of find_pretty_printer to simplify it.
132 Look for a pretty-printer to print VALUE in the current program space.
133 The result is NULL if there's an error and the search should be terminated.
134 The result is Py_None, suitably inc-ref'd, if no pretty-printer was found.
135 Otherwise the result is the pretty-printer function, suitably inc-ref'd. */
136
137static PyObject *
138find_pretty_printer_from_progspace (PyObject *value)
139{
140 PyObject *pp_list;
141 PyObject *function;
142 PyObject *obj = pspace_to_pspace_object (current_program_space);
143
144 if (!obj)
145 return NULL;
146 pp_list = pspy_get_printers (obj, NULL);
147 function = search_pp_list (pp_list, value);
148 Py_XDECREF (pp_list);
149 return function;
150}
151
152/* Subroutine of find_pretty_printer to simplify it.
153 Look for a pretty-printer to print VALUE in the gdb module.
154 The result is NULL if there's an error and the search should be terminated.
155 The result is Py_None, suitably inc-ref'd, if no pretty-printer was found.
156 Otherwise the result is the pretty-printer function, suitably inc-ref'd. */
157
158static PyObject *
159find_pretty_printer_from_gdb (PyObject *value)
160{
161 PyObject *pp_list;
162 PyObject *function;
163
23fa7f66 164 /* Fetch the global pretty printer list. */
a6bac58e 165 if (! PyObject_HasAttrString (gdb_module, "pretty_printers"))
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DE
166 Py_RETURN_NONE;
167 pp_list = PyObject_GetAttrString (gdb_module, "pretty_printers");
168 if (pp_list == NULL || ! PyList_Check (pp_list))
a6bac58e 169 {
fa33c3cd
DE
170 Py_XDECREF (pp_list);
171 Py_RETURN_NONE;
a6bac58e 172 }
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173
174 function = search_pp_list (pp_list, value);
a6bac58e 175 Py_XDECREF (pp_list);
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176 return function;
177}
be759fcf 178
fa33c3cd
DE
179/* Find the pretty-printing constructor function for VALUE. If no
180 pretty-printer exists, return None. If one exists, return a new
181 reference. On error, set the Python error and return NULL. */
182
183static PyObject *
184find_pretty_printer (PyObject *value)
185{
186 PyObject *function;
187
23fa7f66 188 /* Look at the pretty-printer list for each objfile
fa33c3cd
DE
189 in the current program-space. */
190 function = find_pretty_printer_from_objfiles (value);
191 if (function == NULL || function != Py_None)
192 return function;
193 Py_DECREF (function);
194
23fa7f66 195 /* Look at the pretty-printer list for the current program-space. */
fa33c3cd
DE
196 function = find_pretty_printer_from_progspace (value);
197 if (function == NULL || function != Py_None)
198 return function;
199 Py_DECREF (function);
200
23fa7f66 201 /* Look at the pretty-printer list in the gdb module. */
fa33c3cd
DE
202 function = find_pretty_printer_from_gdb (value);
203 return function;
204}
be759fcf 205
fbb8f299
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206/* Pretty-print a single value, via the printer object PRINTER.
207 If the function returns a string, a PyObject containing the string
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208 is returned. If the function returns Py_NONE that means the pretty
209 printer returned the Python None as a value. Otherwise, if the
210 function returns a value, *OUT_VALUE is set to the value, and NULL
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211 is returned. On error, *OUT_VALUE is set to NULL, NULL is
212 returned, with a python exception set. */
79f283fe 213
fbb8f299 214static PyObject *
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TT
215pretty_print_one_value (PyObject *printer, struct value **out_value)
216{
a6bac58e 217 volatile struct gdb_exception except;
fbb8f299 218 PyObject *result = NULL;
a6bac58e 219
fbb8f299 220 *out_value = NULL;
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TT
221 TRY_CATCH (except, RETURN_MASK_ALL)
222 {
a6bac58e
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223 result = PyObject_CallMethodObjArgs (printer, gdbpy_to_string_cst, NULL);
224 if (result)
225 {
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226 if (! gdbpy_is_string (result) && ! gdbpy_is_lazy_string (result)
227 && result != Py_None)
fbb8f299
PM
228 {
229 *out_value = convert_value_from_python (result);
230 if (PyErr_Occurred ())
231 *out_value = NULL;
232 Py_DECREF (result);
233 result = NULL;
234 }
a6bac58e
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235 }
236 }
237
fbb8f299 238 return result;
a6bac58e
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239}
240
241/* Return the display hint for the object printer, PRINTER. Return
242 NULL if there is no display_hint method, or if the method did not
243 return a string. On error, print stack trace and return NULL. On
244 success, return an xmalloc()d string. */
245char *
246gdbpy_get_display_hint (PyObject *printer)
247{
248 PyObject *hint;
249 char *result = NULL;
250
251 if (! PyObject_HasAttr (printer, gdbpy_display_hint_cst))
252 return NULL;
253
254 hint = PyObject_CallMethodObjArgs (printer, gdbpy_display_hint_cst, NULL);
a6bac58e 255 if (hint)
f04e4012
TT
256 {
257 if (gdbpy_is_string (hint))
8dc78533
JK
258 {
259 result = python_string_to_host_string (hint);
260 if (result == NULL)
261 gdbpy_print_stack ();
262 }
f04e4012
TT
263 Py_DECREF (hint);
264 }
a6bac58e
TT
265 else
266 gdbpy_print_stack ();
267
268 return result;
269}
270
621c8364
TT
271/* A wrapper for gdbpy_print_stack that ignores MemoryError. */
272
273static void
274print_stack_unless_memory_error (struct ui_file *stream)
275{
276 if (PyErr_ExceptionMatches (gdbpy_gdb_memory_error))
277 {
278 struct cleanup *cleanup;
279 PyObject *type, *value, *trace;
280 char *msg;
281
282 PyErr_Fetch (&type, &value, &trace);
283 cleanup = make_cleanup_py_decref (type);
284 make_cleanup_py_decref (value);
285 make_cleanup_py_decref (trace);
286
287 msg = gdbpy_exception_to_string (type, value);
288 make_cleanup (xfree, msg);
289
290 if (msg == NULL || *msg == '\0')
1dae3efc 291 fprintf_filtered (stream, _("<error reading variable>"));
621c8364
TT
292 else
293 fprintf_filtered (stream, _("<error reading variable: %s>"), msg);
294
295 do_cleanups (cleanup);
296 }
297 else
298 gdbpy_print_stack ();
299}
300
a6bac58e 301/* Helper for apply_val_pretty_printer which calls to_string and
621c8364
TT
302 formats the result. */
303
304static enum string_repr_result
a6bac58e
TT
305print_string_repr (PyObject *printer, const char *hint,
306 struct ui_file *stream, int recurse,
307 const struct value_print_options *options,
50810684
UW
308 const struct language_defn *language,
309 struct gdbarch *gdbarch)
a6bac58e 310{
a6bac58e 311 struct value *replacement = NULL;
fbb8f299 312 PyObject *py_str = NULL;
621c8364 313 enum string_repr_result result = string_repr_ok;
a6bac58e 314
fbb8f299
PM
315 py_str = pretty_print_one_value (printer, &replacement);
316 if (py_str)
a6bac58e 317 {
09ca9e2e
TT
318 struct cleanup *cleanup = make_cleanup_py_decref (py_str);
319
79f283fe 320 if (py_str == Py_None)
621c8364 321 result = string_repr_none;
09ca9e2e 322 else if (gdbpy_is_lazy_string (py_str))
fbb8f299 323 {
09ca9e2e 324 CORE_ADDR addr;
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325 long length;
326 struct type *type;
327 char *encoding = NULL;
a81766d8 328 struct value_print_options local_opts = *options;
79f283fe 329
09ca9e2e
TT
330 make_cleanup (free_current_contents, &encoding);
331 gdbpy_extract_lazy_string (py_str, &addr, &type,
332 &length, &encoding);
333
a81766d8 334 local_opts.addressprint = 0;
09ca9e2e 335 val_print_string (type, encoding, addr, (int) length,
a81766d8 336 stream, &local_opts);
09ca9e2e
TT
337 }
338 else
339 {
340 PyObject *string;
341
342 string = python_string_to_target_python_string (py_str);
343 if (string)
79f283fe 344 {
09ca9e2e
TT
345 gdb_byte *output;
346 long length;
347 struct type *type;
348
349 make_cleanup_py_decref (string);
350 output = PyString_AsString (string);
351 length = PyString_Size (string);
352 type = builtin_type (gdbarch)->builtin_char;
353
354 if (hint && !strcmp (hint, "string"))
355 LA_PRINT_STRING (stream, type, output, length, NULL,
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PM
356 0, options);
357 else
358 fputs_filtered (output, stream);
be759fcf
PM
359 }
360 else
621c8364
TT
361 {
362 result = string_repr_error;
363 print_stack_unless_memory_error (stream);
364 }
79f283fe 365 }
09ca9e2e
TT
366
367 do_cleanups (cleanup);
a6bac58e
TT
368 }
369 else if (replacement)
269f82e5
PP
370 {
371 struct value_print_options opts = *options;
372
373 opts.addressprint = 0;
374 common_val_print (replacement, stream, recurse, &opts, language);
375 }
a6bac58e 376 else
621c8364
TT
377 {
378 result = string_repr_error;
379 print_stack_unless_memory_error (stream);
380 }
79f283fe 381
621c8364 382 return result;
a6bac58e
TT
383}
384
385static void
386py_restore_tstate (void *p)
387{
388 PyFrameObject *frame = p;
389 PyThreadState *tstate = PyThreadState_GET ();
d59b6f6c 390
a6bac58e
TT
391 tstate->frame = frame;
392}
393
394/* Create a dummy PyFrameObject, needed to work around
395 a Python-2.4 bug with generators. */
396static PyObject *
eeae04df 397push_dummy_python_frame (void)
a6bac58e
TT
398{
399 PyObject *empty_string, *null_tuple, *globals;
400 PyCodeObject *code;
401 PyFrameObject *frame;
402 PyThreadState *tstate;
403
404 empty_string = PyString_FromString ("");
405 if (!empty_string)
406 return NULL;
407
408 null_tuple = PyTuple_New (0);
409 if (!null_tuple)
410 {
411 Py_DECREF (empty_string);
412 return NULL;
413 }
414
415 code = PyCode_New (0, /* argcount */
416 0, /* nlocals */
417 0, /* stacksize */
418 0, /* flags */
419 empty_string, /* code */
420 null_tuple, /* consts */
421 null_tuple, /* names */
422 null_tuple, /* varnames */
423#if PYTHON_API_VERSION >= 1010
424 null_tuple, /* freevars */
425 null_tuple, /* cellvars */
426#endif
427 empty_string, /* filename */
428 empty_string, /* name */
429 1, /* firstlineno */
430 empty_string /* lnotab */
431 );
432
433 Py_DECREF (empty_string);
434 Py_DECREF (null_tuple);
435
436 if (!code)
437 return NULL;
438
439 globals = PyDict_New ();
440 if (!globals)
441 {
442 Py_DECREF (code);
443 return NULL;
444 }
445
446 tstate = PyThreadState_GET ();
447
448 frame = PyFrame_New (tstate, code, globals, NULL);
449
450 Py_DECREF (globals);
451 Py_DECREF (code);
452
453 if (!frame)
454 return NULL;
455
456 tstate->frame = frame;
457 make_cleanup (py_restore_tstate, frame->f_back);
458 return (PyObject *) frame;
459}
460
461/* Helper for apply_val_pretty_printer that formats children of the
79f283fe
PM
462 printer, if any exist. If is_py_none is true, then nothing has
463 been printed by to_string, and format output accordingly. */
a6bac58e
TT
464static void
465print_children (PyObject *printer, const char *hint,
466 struct ui_file *stream, int recurse,
467 const struct value_print_options *options,
79f283fe
PM
468 const struct language_defn *language,
469 int is_py_none)
a6bac58e
TT
470{
471 int is_map, is_array, done_flag, pretty;
472 unsigned int i;
473 PyObject *children, *iter, *frame;
474 struct cleanup *cleanups;
475
476 if (! PyObject_HasAttr (printer, gdbpy_children_cst))
477 return;
478
479 /* If we are printing a map or an array, we want some special
480 formatting. */
481 is_map = hint && ! strcmp (hint, "map");
482 is_array = hint && ! strcmp (hint, "array");
483
484 children = PyObject_CallMethodObjArgs (printer, gdbpy_children_cst,
485 NULL);
486 if (! children)
487 {
621c8364 488 print_stack_unless_memory_error (stream);
a6bac58e
TT
489 return;
490 }
491
492 cleanups = make_cleanup_py_decref (children);
493
494 iter = PyObject_GetIter (children);
495 if (!iter)
496 {
621c8364 497 print_stack_unless_memory_error (stream);
a6bac58e
TT
498 goto done;
499 }
500 make_cleanup_py_decref (iter);
501
502 /* Use the prettyprint_arrays option if we are printing an array,
503 and the pretty option otherwise. */
a81766d8
TT
504 if (is_array)
505 pretty = options->prettyprint_arrays;
506 else
507 {
508 if (options->pretty == Val_prettyprint)
509 pretty = 1;
510 else
511 pretty = options->prettyprint_structs;
512 }
a6bac58e
TT
513
514 /* Manufacture a dummy Python frame to work around Python 2.4 bug,
515 where it insists on having a non-NULL tstate->frame when
516 a generator is called. */
517 frame = push_dummy_python_frame ();
518 if (!frame)
519 {
520 gdbpy_print_stack ();
521 goto done;
522 }
523 make_cleanup_py_decref (frame);
524
525 done_flag = 0;
526 for (i = 0; i < options->print_max; ++i)
527 {
528 PyObject *py_v, *item = PyIter_Next (iter);
529 char *name;
530 struct cleanup *inner_cleanup;
531
532 if (! item)
533 {
534 if (PyErr_Occurred ())
621c8364 535 print_stack_unless_memory_error (stream);
a6bac58e
TT
536 /* Set a flag so we can know whether we printed all the
537 available elements. */
538 else
539 done_flag = 1;
540 break;
541 }
542
543 if (! PyArg_ParseTuple (item, "sO", &name, &py_v))
544 {
545 gdbpy_print_stack ();
546 Py_DECREF (item);
547 continue;
548 }
549 inner_cleanup = make_cleanup_py_decref (item);
550
551 /* Print initial "{". For other elements, there are three
552 cases:
553 1. Maps. Print a "," after each value element.
554 2. Arrays. Always print a ",".
555 3. Other. Always print a ",". */
556 if (i == 0)
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PM
557 {
558 if (is_py_none)
559 fputs_filtered ("{", stream);
560 else
561 fputs_filtered (" = {", stream);
562 }
563
a6bac58e
TT
564 else if (! is_map || i % 2 == 0)
565 fputs_filtered (pretty ? "," : ", ", stream);
566
567 /* In summary mode, we just want to print "= {...}" if there is
568 a value. */
569 if (options->summary)
570 {
571 /* This increment tricks the post-loop logic to print what
572 we want. */
573 ++i;
574 /* Likewise. */
575 pretty = 0;
576 break;
577 }
578
579 if (! is_map || i % 2 == 0)
580 {
581 if (pretty)
582 {
583 fputs_filtered ("\n", stream);
584 print_spaces_filtered (2 + 2 * recurse, stream);
585 }
586 else
587 wrap_here (n_spaces (2 + 2 *recurse));
588 }
589
590 if (is_map && i % 2 == 0)
591 fputs_filtered ("[", stream);
592 else if (is_array)
593 {
594 /* We print the index, not whatever the child method
595 returned as the name. */
596 if (options->print_array_indexes)
597 fprintf_filtered (stream, "[%d] = ", i);
598 }
599 else if (! is_map)
600 {
601 fputs_filtered (name, stream);
602 fputs_filtered (" = ", stream);
603 }
604
09ca9e2e 605 if (gdbpy_is_lazy_string (py_v))
a6bac58e 606 {
09ca9e2e
TT
607 CORE_ADDR addr;
608 struct type *type;
609 long length;
610 char *encoding = NULL;
a81766d8 611 struct value_print_options local_opts = *options;
be759fcf 612
09ca9e2e
TT
613 make_cleanup (free_current_contents, &encoding);
614 gdbpy_extract_lazy_string (py_v, &addr, &type, &length, &encoding);
615
a81766d8 616 local_opts.addressprint = 0;
09ca9e2e 617 val_print_string (type, encoding, addr, (int) length, stream,
a81766d8 618 &local_opts);
09ca9e2e
TT
619
620 do_cleanups (inner_cleanup);
621 }
622 else if (gdbpy_is_string (py_v))
623 {
624 gdb_byte *output;
625
626 output = python_string_to_host_string (py_v);
627 if (!output)
628 gdbpy_print_stack ();
a6bac58e
TT
629 else
630 {
09ca9e2e 631 fputs_filtered (output, stream);
be759fcf 632 xfree (output);
a6bac58e
TT
633 }
634 }
635 else
636 {
637 struct value *value = convert_value_from_python (py_v);
638
639 if (value == NULL)
640 {
641 gdbpy_print_stack ();
642 error (_("Error while executing Python code."));
643 }
644 else
645 common_val_print (value, stream, recurse + 1, options, language);
646 }
647
648 if (is_map && i % 2 == 0)
649 fputs_filtered ("] = ", stream);
650
651 do_cleanups (inner_cleanup);
652 }
653
654 if (i)
655 {
656 if (!done_flag)
657 {
658 if (pretty)
659 {
660 fputs_filtered ("\n", stream);
661 print_spaces_filtered (2 + 2 * recurse, stream);
662 }
663 fputs_filtered ("...", stream);
664 }
665 if (pretty)
666 {
667 fputs_filtered ("\n", stream);
668 print_spaces_filtered (2 * recurse, stream);
669 }
670 fputs_filtered ("}", stream);
671 }
672
673 done:
674 do_cleanups (cleanups);
675}
676
677int
678apply_val_pretty_printer (struct type *type, const gdb_byte *valaddr,
679 int embedded_offset, CORE_ADDR address,
680 struct ui_file *stream, int recurse,
0e03807e 681 const struct value *val,
a6bac58e
TT
682 const struct value_print_options *options,
683 const struct language_defn *language)
684{
50810684 685 struct gdbarch *gdbarch = get_type_arch (type);
a6bac58e
TT
686 PyObject *printer = NULL;
687 PyObject *val_obj = NULL;
688 struct value *value;
689 char *hint = NULL;
690 struct cleanup *cleanups;
691 int result = 0;
621c8364 692 enum string_repr_result print_result;
4e07d55f
PA
693
694 /* No pretty-printer support for unavailable values. */
63360adc 695 if (!value_bytes_available (val, embedded_offset, TYPE_LENGTH (type)))
4e07d55f
PA
696 return 0;
697
d452c4bc 698 cleanups = ensure_python_env (gdbarch, language);
a6bac58e
TT
699
700 /* Instantiate the printer. */
701 if (valaddr)
702 valaddr += embedded_offset;
edf3d5f3
TT
703 value = value_from_contents_and_address (type, valaddr,
704 address + embedded_offset);
63360adc
MS
705
706 set_value_component_location (value, val);
707 /* set_value_component_location resets the address, so we may
708 need to set it again. */
709 if (VALUE_LVAL (value) != lval_internalvar
710 && VALUE_LVAL (value) != lval_internalvar_component
711 && VALUE_LVAL (value) != lval_computed)
712 set_value_address (value, address + embedded_offset);
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713
714 val_obj = value_to_value_object (value);
715 if (! val_obj)
716 goto done;
717
718 /* Find the constructor. */
719 printer = find_pretty_printer (val_obj);
720 Py_DECREF (val_obj);
721 make_cleanup_py_decref (printer);
722 if (! printer || printer == Py_None)
723 goto done;
724
725 /* If we are printing a map, we want some special formatting. */
726 hint = gdbpy_get_display_hint (printer);
727 make_cleanup (free_current_contents, &hint);
728
729 /* Print the section */
621c8364
TT
730 print_result = print_string_repr (printer, hint, stream, recurse,
731 options, language, gdbarch);
732 if (print_result != string_repr_error)
733 print_children (printer, hint, stream, recurse, options, language,
734 print_result == string_repr_none);
79f283fe 735
a6bac58e
TT
736 result = 1;
737
738
739 done:
740 if (PyErr_Occurred ())
621c8364 741 print_stack_unless_memory_error (stream);
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TT
742 do_cleanups (cleanups);
743 return result;
744}
745
fbb8f299 746
b6313243
TT
747/* Apply a pretty-printer for the varobj code. PRINTER_OBJ is the
748 print object. It must have a 'to_string' method (but this is
749 checked by varobj, not here) which takes no arguments and
fbb8f299
PM
750 returns a string. The printer will return a value and in the case
751 of a Python string being returned, this function will return a
752 PyObject containing the string. For any other type, *REPLACEMENT is
753 set to the replacement value and this function returns NULL. On
754 error, *REPLACEMENT is set to NULL and this function also returns
755 NULL. */
756PyObject *
b6313243 757apply_varobj_pretty_printer (PyObject *printer_obj,
621c8364
TT
758 struct value **replacement,
759 struct ui_file *stream)
b6313243 760{
fbb8f299 761 PyObject *py_str = NULL;
b6313243
TT
762
763 *replacement = NULL;
fbb8f299
PM
764 py_str = pretty_print_one_value (printer_obj, replacement);
765
766 if (*replacement == NULL && py_str == NULL)
621c8364 767 print_stack_unless_memory_error (stream);
b6313243 768
fbb8f299 769 return py_str;
b6313243
TT
770}
771
772/* Find a pretty-printer object for the varobj module. Returns a new
773 reference to the object if successful; returns NULL if not. VALUE
774 is the value for which a printer tests to determine if it
775 can pretty-print the value. */
776PyObject *
777gdbpy_get_varobj_pretty_printer (struct value *value)
778{
779 PyObject *val_obj;
780 PyObject *pretty_printer = NULL;
781 volatile struct gdb_exception except;
782
783 TRY_CATCH (except, RETURN_MASK_ALL)
784 {
785 value = value_copy (value);
786 }
787 GDB_PY_HANDLE_EXCEPTION (except);
788
789 val_obj = value_to_value_object (value);
790 if (! val_obj)
791 return NULL;
792
793 pretty_printer = find_pretty_printer (val_obj);
794 Py_DECREF (val_obj);
795 return pretty_printer;
796}
797
798/* A Python function which wraps find_pretty_printer and instantiates
799 the resulting class. This accepts a Value argument and returns a
800 pretty printer instance, or None. This function is useful as an
801 argument to the MI command -var-set-visualizer. */
802PyObject *
803gdbpy_default_visualizer (PyObject *self, PyObject *args)
804{
805 PyObject *val_obj;
f92adf3c 806 PyObject *cons;
b6313243
TT
807 struct value *value;
808
809 if (! PyArg_ParseTuple (args, "O", &val_obj))
810 return NULL;
811 value = value_object_to_value (val_obj);
812 if (! value)
813 {
044c0f87
PM
814 PyErr_SetString (PyExc_TypeError,
815 _("Argument must be a gdb.Value."));
b6313243
TT
816 return NULL;
817 }
818
819 cons = find_pretty_printer (val_obj);
820 return cons;
821}
822
a6bac58e
TT
823#else /* HAVE_PYTHON */
824
825int
826apply_val_pretty_printer (struct type *type, const gdb_byte *valaddr,
827 int embedded_offset, CORE_ADDR address,
6bf0ce2b 828 struct ui_file *stream, int recurse,
0e03807e 829 const struct value *val,
6bf0ce2b 830 const struct value_print_options *options,
a6bac58e
TT
831 const struct language_defn *language)
832{
833 return 0;
834}
835
836#endif /* HAVE_PYTHON */
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