1 /* Support for printing C values for GDB, the GNU debugger.
3 Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 1998, 1999, 2000, 2001, 2003, 2005, 2006, 2007, 2008, 2009
5 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "gdb_string.h"
26 #include "expression.h"
35 /* Print function pointer with inferior address ADDRESS onto stdio
39 print_function_pointer_address (struct gdbarch *gdbarch, CORE_ADDR address,
40 struct ui_file *stream, int addressprint)
42 CORE_ADDR func_addr = gdbarch_convert_from_func_ptr_addr (gdbarch, address,
45 /* If the function pointer is represented by a description, print the
46 address of the description. */
47 if (addressprint && func_addr != address)
49 fputs_filtered ("@", stream);
50 fputs_filtered (paddress (gdbarch, address), stream);
51 fputs_filtered (": ", stream);
53 print_address_demangle (gdbarch, func_addr, stream, demangle);
57 /* A helper for textual_element_type. This checks the name of the
58 typedef. This is bogus but it isn't apparent that the compiler
59 provides us the help we may need. */
62 textual_name (const char *name)
64 return (!strcmp (name, "wchar_t")
65 || !strcmp (name, "char16_t")
66 || !strcmp (name, "char32_t"));
69 /* Apply a heuristic to decide whether an array of TYPE or a pointer
70 to TYPE should be printed as a textual string. Return non-zero if
71 it should, or zero if it should be treated as an array of integers
72 or pointer to integers. FORMAT is the current format letter,
75 We guess that "char" is a character. Explicitly signed and
76 unsigned character types are also characters. Integer data from
77 vector types is not. The user can override this by using the /s
81 textual_element_type (struct type *type, char format)
83 struct type *true_type, *iter_type;
85 if (format != 0 && format != 's')
88 /* We also rely on this for its side effect of setting up all the
90 true_type = check_typedef (type);
92 /* TYPE_CODE_CHAR is always textual. */
93 if (TYPE_CODE (true_type) == TYPE_CODE_CHAR)
96 /* Any other character-like types must be integral. */
97 if (TYPE_CODE (true_type) != TYPE_CODE_INT)
100 /* We peel typedefs one by one, looking for a match. */
104 /* Check the name of the type. */
105 if (TYPE_NAME (iter_type) && textual_name (TYPE_NAME (iter_type)))
108 if (TYPE_CODE (iter_type) != TYPE_CODE_TYPEDEF)
111 /* Peel a single typedef. If the typedef doesn't have a target
112 type, we use check_typedef and hope the result is ok -- it
113 might be for C++, where wchar_t is a built-in type. */
114 if (TYPE_TARGET_TYPE (iter_type))
115 iter_type = TYPE_TARGET_TYPE (iter_type);
117 iter_type = check_typedef (iter_type);
122 /* Print this as a string if we can manage it. For now, no
123 wide character support. */
124 if (TYPE_CODE (true_type) == TYPE_CODE_INT
125 && TYPE_LENGTH (true_type) == 1)
130 /* If a one-byte TYPE_CODE_INT is missing the not-a-character
131 flag, then we treat it as text; otherwise, we assume it's
132 being used as data. */
133 if (TYPE_CODE (true_type) == TYPE_CODE_INT
134 && TYPE_LENGTH (true_type) == 1
135 && !TYPE_NOTTEXT (true_type))
143 /* Print data of type TYPE located at VALADDR (within GDB), which came from
144 the inferior at address ADDRESS, onto stdio stream STREAM according to
145 OPTIONS. The data at VALADDR is in target byte order.
147 If the data are a string pointer, returns the number of string characters
151 c_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
152 CORE_ADDR address, struct ui_file *stream, int recurse,
153 const struct value_print_options *options)
155 struct gdbarch *gdbarch = get_type_arch (type);
156 unsigned int i = 0; /* Number of characters printed */
158 struct type *elttype, *unresolved_elttype;
159 struct type *unresolved_type = type;
164 CHECK_TYPEDEF (type);
165 switch (TYPE_CODE (type))
167 case TYPE_CODE_ARRAY:
168 unresolved_elttype = TYPE_TARGET_TYPE (type);
169 elttype = check_typedef (unresolved_elttype);
170 if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (unresolved_elttype) > 0)
172 eltlen = TYPE_LENGTH (elttype);
173 len = TYPE_LENGTH (type) / eltlen;
174 if (options->prettyprint_arrays)
176 print_spaces_filtered (2 + 2 * recurse, stream);
179 /* Print arrays of textual chars with a string syntax. */
180 if (textual_element_type (unresolved_elttype, options->format))
182 /* If requested, look for the first null char and only print
183 elements up to it. */
184 if (options->stop_print_at_null)
186 unsigned int temp_len;
190 && temp_len < options->print_max
191 && extract_unsigned_integer (valaddr + embedded_offset
199 LA_PRINT_STRING (stream, unresolved_elttype,
200 valaddr + embedded_offset, len, 0, options);
205 fprintf_filtered (stream, "{");
206 /* If this is a virtual function table, print the 0th
207 entry specially, and the rest of the members normally. */
208 if (cp_is_vtbl_ptr_type (elttype))
211 fprintf_filtered (stream, _("%d vtable entries"), len - 1);
217 val_print_array_elements (type, valaddr + embedded_offset, address, stream,
218 recurse, options, i);
219 fprintf_filtered (stream, "}");
223 /* Array of unspecified length: treat like pointer to first elt. */
225 goto print_unpacked_pointer;
227 case TYPE_CODE_MEMBERPTR:
230 print_scalar_formatted (valaddr + embedded_offset, type,
234 cp_print_class_member (valaddr + embedded_offset, type, stream, "&");
237 case TYPE_CODE_METHODPTR:
238 cplus_print_method_ptr (valaddr + embedded_offset, type, stream);
242 if (options->format && options->format != 's')
244 print_scalar_formatted (valaddr + embedded_offset, type,
248 if (options->vtblprint && cp_is_vtbl_ptr_type (type))
250 /* Print the unmangled name if desired. */
251 /* Print vtable entry - we only get here if we ARE using
252 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
254 = extract_typed_address (valaddr + embedded_offset, type);
255 print_function_pointer_address (gdbarch, addr, stream,
256 options->addressprint);
259 unresolved_elttype = TYPE_TARGET_TYPE (type);
260 elttype = check_typedef (unresolved_elttype);
262 addr = unpack_pointer (type, valaddr + embedded_offset);
263 print_unpacked_pointer:
265 if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
267 /* Try to print what function it points to. */
268 print_function_pointer_address (gdbarch, addr, stream,
269 options->addressprint);
270 /* Return value is irrelevant except for string pointers. */
274 if (options->addressprint)
275 fputs_filtered (paddress (gdbarch, addr), stream);
277 /* For a pointer to a textual type, also print the string
278 pointed to, unless pointer is null. */
280 if (textual_element_type (unresolved_elttype, options->format)
283 i = val_print_string (unresolved_elttype, addr, -1, stream,
286 else if (cp_is_vtbl_member (type))
288 /* print vtbl's nicely */
289 CORE_ADDR vt_address = unpack_pointer (type, valaddr + embedded_offset);
291 struct minimal_symbol *msymbol =
292 lookup_minimal_symbol_by_pc (vt_address);
293 if ((msymbol != NULL) &&
294 (vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
296 fputs_filtered (" <", stream);
297 fputs_filtered (SYMBOL_PRINT_NAME (msymbol), stream);
298 fputs_filtered (">", stream);
300 if (vt_address && options->vtblprint)
302 struct value *vt_val;
303 struct symbol *wsym = (struct symbol *) NULL;
305 struct block *block = (struct block *) NULL;
309 wsym = lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol), block,
310 VAR_DOMAIN, &is_this_fld);
314 wtype = SYMBOL_TYPE (wsym);
318 wtype = unresolved_elttype;
320 vt_val = value_at (wtype, vt_address);
321 common_val_print (vt_val, stream, recurse + 1, options,
325 fprintf_filtered (stream, "\n");
326 print_spaces_filtered (2 + 2 * recurse, stream);
331 /* Return number of characters printed, including the terminating
332 '\0' if we reached the end. val_print_string takes care including
333 the terminating '\0' if necessary. */
339 elttype = check_typedef (TYPE_TARGET_TYPE (type));
340 if (options->addressprint)
343 = extract_typed_address (valaddr + embedded_offset, type);
344 fprintf_filtered (stream, "@");
345 fputs_filtered (paddress (gdbarch, addr), stream);
346 if (options->deref_ref)
347 fputs_filtered (": ", stream);
349 /* De-reference the reference. */
350 if (options->deref_ref)
352 if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
354 struct value *deref_val =
356 (TYPE_TARGET_TYPE (type),
357 unpack_pointer (type, valaddr + embedded_offset));
358 common_val_print (deref_val, stream, recurse, options,
362 fputs_filtered ("???", stream);
366 case TYPE_CODE_UNION:
367 if (recurse && !options->unionprint)
369 fprintf_filtered (stream, "{...}");
373 case TYPE_CODE_STRUCT:
374 /*FIXME: Abstract this away */
375 if (options->vtblprint && cp_is_vtbl_ptr_type (type))
377 /* Print the unmangled name if desired. */
378 /* Print vtable entry - we only get here if NOT using
379 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
380 int offset = (embedded_offset +
381 TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8);
382 struct type *field_type = TYPE_FIELD_TYPE (type, VTBL_FNADDR_OFFSET);
384 = extract_typed_address (valaddr + offset, field_type);
386 print_function_pointer_address (gdbarch, addr, stream,
387 options->addressprint);
390 cp_print_value_fields (type, type, valaddr, embedded_offset, address, stream,
391 recurse, options, NULL, 0);
397 print_scalar_formatted (valaddr + embedded_offset, type,
401 len = TYPE_NFIELDS (type);
402 val = unpack_long (type, valaddr + embedded_offset);
403 for (i = 0; i < len; i++)
406 if (val == TYPE_FIELD_BITPOS (type, i))
413 fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
417 print_longest (stream, 'd', 0, val);
421 case TYPE_CODE_FLAGS:
423 print_scalar_formatted (valaddr + embedded_offset, type,
426 val_print_type_code_flags (type, valaddr + embedded_offset, stream);
430 case TYPE_CODE_METHOD:
433 print_scalar_formatted (valaddr + embedded_offset, type,
437 /* FIXME, we should consider, at least for ANSI C language, eliminating
438 the distinction made between FUNCs and POINTERs to FUNCs. */
439 fprintf_filtered (stream, "{");
440 type_print (type, "", stream, -1);
441 fprintf_filtered (stream, "} ");
442 /* Try to print what function it points to, and its address. */
443 print_address_demangle (gdbarch, address, stream, demangle);
447 if (options->format || options->output_format)
449 struct value_print_options opts = *options;
450 opts.format = (options->format ? options->format
451 : options->output_format);
452 print_scalar_formatted (valaddr + embedded_offset, type,
457 val = unpack_long (type, valaddr + embedded_offset);
459 fputs_filtered ("false", stream);
461 fputs_filtered ("true", stream);
463 print_longest (stream, 'd', 0, val);
467 case TYPE_CODE_RANGE:
468 /* FIXME: create_range_type does not set the unsigned bit in a
469 range type (I think it probably should copy it from the target
470 type), so we won't print values which are too large to
471 fit in a signed integer correctly. */
472 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
473 print with the target type, though, because the size of our type
474 and the target type might differ). */
478 if (options->format || options->output_format)
480 struct value_print_options opts = *options;
481 opts.format = (options->format ? options->format
482 : options->output_format);
483 print_scalar_formatted (valaddr + embedded_offset, type,
488 val_print_type_code_int (type, valaddr + embedded_offset, stream);
489 /* C and C++ has no single byte int type, char is used instead.
490 Since we don't know whether the value is really intended to
491 be used as an integer or a character, print the character
492 equivalent as well. */
493 if (textual_element_type (unresolved_type, options->format))
495 fputs_filtered (" ", stream);
496 LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr + embedded_offset),
497 unresolved_type, stream);
503 if (options->format || options->output_format)
505 struct value_print_options opts = *options;
506 opts.format = (options->format ? options->format
507 : options->output_format);
508 print_scalar_formatted (valaddr + embedded_offset, type,
513 val = unpack_long (type, valaddr + embedded_offset);
514 if (TYPE_UNSIGNED (type))
515 fprintf_filtered (stream, "%u", (unsigned int) val);
517 fprintf_filtered (stream, "%d", (int) val);
518 fputs_filtered (" ", stream);
519 LA_PRINT_CHAR ((unsigned char) val, unresolved_type, stream);
526 print_scalar_formatted (valaddr + embedded_offset, type,
531 print_floating (valaddr + embedded_offset, type, stream);
535 case TYPE_CODE_DECFLOAT:
537 print_scalar_formatted (valaddr + embedded_offset, type,
540 print_decimal_floating (valaddr + embedded_offset, type, stream);
544 fprintf_filtered (stream, "void");
547 case TYPE_CODE_ERROR:
548 fprintf_filtered (stream, _("<error type>"));
551 case TYPE_CODE_UNDEF:
552 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
553 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
554 and no complete type for struct foo in that file. */
555 fprintf_filtered (stream, _("<incomplete type>"));
558 case TYPE_CODE_COMPLEX:
560 print_scalar_formatted (valaddr + embedded_offset,
561 TYPE_TARGET_TYPE (type),
564 print_floating (valaddr + embedded_offset, TYPE_TARGET_TYPE (type),
566 fprintf_filtered (stream, " + ");
568 print_scalar_formatted (valaddr + embedded_offset
569 + TYPE_LENGTH (TYPE_TARGET_TYPE (type)),
570 TYPE_TARGET_TYPE (type),
573 print_floating (valaddr + embedded_offset
574 + TYPE_LENGTH (TYPE_TARGET_TYPE (type)),
575 TYPE_TARGET_TYPE (type),
577 fprintf_filtered (stream, " * I");
581 error (_("Invalid C/C++ type code %d in symbol table."), TYPE_CODE (type));
588 c_value_print (struct value *val, struct ui_file *stream,
589 const struct value_print_options *options)
591 struct type *type, *real_type, *val_type;
592 int full, top, using_enc;
593 struct value_print_options opts = *options;
597 /* If it is a pointer, indicate what it points to.
599 Print type also if it is a reference.
601 C++: if it is a member pointer, we will take care
602 of that when we print it. */
604 /* Preserve the original type before stripping typedefs. We prefer
605 to pass down the original type when possible, but for local
606 checks it is better to look past the typedefs. */
607 val_type = value_type (val);
608 type = check_typedef (val_type);
610 if (TYPE_CODE (type) == TYPE_CODE_PTR
611 || TYPE_CODE (type) == TYPE_CODE_REF)
613 /* Hack: remove (char *) for char strings. Their
614 type is indicated by the quoted string anyway.
615 (Don't use textual_element_type here; quoted strings
616 are always exactly (char *), (wchar_t *), or the like. */
617 if (TYPE_CODE (val_type) == TYPE_CODE_PTR
618 && TYPE_NAME (val_type) == NULL
619 && TYPE_NAME (TYPE_TARGET_TYPE (val_type)) != NULL
620 && (strcmp (TYPE_NAME (TYPE_TARGET_TYPE (val_type)), "char") == 0
621 || textual_name (TYPE_NAME (TYPE_TARGET_TYPE (val_type)))))
625 else if (options->objectprint
626 && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS))
629 if (TYPE_CODE(type) == TYPE_CODE_REF)
631 /* Copy value, change to pointer, so we don't get an
632 * error about a non-pointer type in value_rtti_target_type
634 struct value *temparg;
635 temparg=value_copy(val);
636 deprecated_set_value_type (temparg, lookup_pointer_type (TYPE_TARGET_TYPE(type)));
639 /* Pointer to class, check real type of object */
640 fprintf_filtered (stream, "(");
641 real_type = value_rtti_target_type (val, &full, &top, &using_enc);
644 /* RTTI entry found */
645 if (TYPE_CODE (type) == TYPE_CODE_PTR)
647 /* create a pointer type pointing to the real type */
648 type = lookup_pointer_type (real_type);
652 /* create a reference type referencing the real type */
653 type = lookup_reference_type (real_type);
655 /* JYG: Need to adjust pointer value. */
656 /* NOTE: cagney/2005-01-02: THIS IS BOGUS. */
657 value_contents_writeable (val)[0] -= top;
659 /* Note: When we look up RTTI entries, we don't get any
660 information on const or volatile attributes */
662 type_print (type, "", stream, -1);
663 fprintf_filtered (stream, ") ");
669 fprintf_filtered (stream, "(");
670 type_print (value_type (val), "", stream, -1);
671 fprintf_filtered (stream, ") ");
675 if (!value_initialized (val))
676 fprintf_filtered (stream, " [uninitialized] ");
678 if (options->objectprint && (TYPE_CODE (type) == TYPE_CODE_CLASS))
680 /* Attempt to determine real type of object */
681 real_type = value_rtti_type (val, &full, &top, &using_enc);
684 /* We have RTTI information, so use it */
685 val = value_full_object (val, real_type, full, top, using_enc);
686 fprintf_filtered (stream, "(%s%s) ",
687 TYPE_NAME (real_type),
688 full ? "" : _(" [incomplete object]"));
689 /* Print out object: enclosing type is same as real_type if full */
690 return val_print (value_enclosing_type (val),
691 value_contents_all (val), 0,
692 value_address (val), stream, 0,
693 &opts, current_language);
694 /* Note: When we look up RTTI entries, we don't get any information on
695 const or volatile attributes */
697 else if (type != check_typedef (value_enclosing_type (val)))
699 /* No RTTI information, so let's do our best */
700 fprintf_filtered (stream, "(%s ?) ",
701 TYPE_NAME (value_enclosing_type (val)));
702 return val_print (value_enclosing_type (val),
703 value_contents_all (val), 0,
704 value_address (val), stream, 0,
705 &opts, current_language);
707 /* Otherwise, we end up at the return outside this "if" */
710 return val_print (val_type, value_contents_all (val),
711 value_embedded_offset (val),
713 stream, 0, &opts, current_language);