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, 2010, 2011
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
,
41 struct ui_file
*stream
,
45 = gdbarch_convert_from_func_ptr_addr (gdbarch
, address
,
48 /* If the function pointer is represented by a description, print
49 the address of the description. */
50 if (addressprint
&& func_addr
!= address
)
52 fputs_filtered ("@", stream
);
53 fputs_filtered (paddress (gdbarch
, address
), stream
);
54 fputs_filtered (": ", stream
);
56 print_address_demangle (gdbarch
, func_addr
, stream
, demangle
);
60 /* A helper for c_textual_element_type. This checks the name of the
61 typedef. This is bogus but it isn't apparent that the compiler
62 provides us the help we may need. */
65 textual_name (const char *name
)
67 return (!strcmp (name
, "wchar_t")
68 || !strcmp (name
, "char16_t")
69 || !strcmp (name
, "char32_t"));
72 /* Apply a heuristic to decide whether an array of TYPE or a pointer
73 to TYPE should be printed as a textual string. Return non-zero if
74 it should, or zero if it should be treated as an array of integers
75 or pointer to integers. FORMAT is the current format letter, or 0
78 We guess that "char" is a character. Explicitly signed and
79 unsigned character types are also characters. Integer data from
80 vector types is not. The user can override this by using the /s
84 c_textual_element_type (struct type
*type
, char format
)
86 struct type
*true_type
, *iter_type
;
88 if (format
!= 0 && format
!= 's')
91 /* We also rely on this for its side effect of setting up all the
93 true_type
= check_typedef (type
);
95 /* TYPE_CODE_CHAR is always textual. */
96 if (TYPE_CODE (true_type
) == TYPE_CODE_CHAR
)
99 /* Any other character-like types must be integral. */
100 if (TYPE_CODE (true_type
) != TYPE_CODE_INT
)
103 /* We peel typedefs one by one, looking for a match. */
107 /* Check the name of the type. */
108 if (TYPE_NAME (iter_type
) && textual_name (TYPE_NAME (iter_type
)))
111 if (TYPE_CODE (iter_type
) != TYPE_CODE_TYPEDEF
)
114 /* Peel a single typedef. If the typedef doesn't have a target
115 type, we use check_typedef and hope the result is ok -- it
116 might be for C++, where wchar_t is a built-in type. */
117 if (TYPE_TARGET_TYPE (iter_type
))
118 iter_type
= TYPE_TARGET_TYPE (iter_type
);
120 iter_type
= check_typedef (iter_type
);
125 /* Print this as a string if we can manage it. For now, no wide
126 character support. */
127 if (TYPE_CODE (true_type
) == TYPE_CODE_INT
128 && TYPE_LENGTH (true_type
) == 1)
133 /* If a one-byte TYPE_CODE_INT is missing the not-a-character
134 flag, then we treat it as text; otherwise, we assume it's
135 being used as data. */
136 if (TYPE_CODE (true_type
) == TYPE_CODE_INT
137 && TYPE_LENGTH (true_type
) == 1
138 && !TYPE_NOTTEXT (true_type
))
146 /* Print data of type TYPE located at VALADDR (within GDB), which came
147 from the inferior at address ADDRESS, onto stdio stream STREAM
148 according to OPTIONS. The data at VALADDR is in target byte order.
150 If the data are a string pointer, returns the number of string
151 characters printed. */
154 c_val_print (struct type
*type
, const gdb_byte
*valaddr
,
155 int embedded_offset
, CORE_ADDR address
,
156 struct ui_file
*stream
, int recurse
,
157 const struct value
*original_value
,
158 const struct value_print_options
*options
)
160 struct gdbarch
*gdbarch
= get_type_arch (type
);
161 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
162 unsigned int i
= 0; /* Number of characters printed. */
164 struct type
*elttype
, *unresolved_elttype
;
165 struct type
*unresolved_type
= type
;
170 CHECK_TYPEDEF (type
);
171 switch (TYPE_CODE (type
))
173 case TYPE_CODE_ARRAY
:
174 unresolved_elttype
= TYPE_TARGET_TYPE (type
);
175 elttype
= check_typedef (unresolved_elttype
);
176 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (unresolved_elttype
) > 0)
178 LONGEST low_bound
, high_bound
;
180 if (!get_array_bounds (type
, &low_bound
, &high_bound
))
181 error (_("Could not determine the array high bound"));
183 eltlen
= TYPE_LENGTH (elttype
);
184 len
= high_bound
- low_bound
+ 1;
185 if (options
->prettyprint_arrays
)
187 print_spaces_filtered (2 + 2 * recurse
, stream
);
190 /* Print arrays of textual chars with a string syntax, as
191 long as the entire array is valid. */
192 if (c_textual_element_type (unresolved_elttype
,
194 && value_bits_valid (original_value
,
195 TARGET_CHAR_BIT
* embedded_offset
,
196 TARGET_CHAR_BIT
* TYPE_LENGTH (type
)))
198 /* If requested, look for the first null char and only
199 print elements up to it. */
200 if (options
->stop_print_at_null
)
202 unsigned int temp_len
;
206 && temp_len
< options
->print_max
207 && extract_unsigned_integer (valaddr
+ embedded_offset
209 eltlen
, byte_order
) != 0);
215 LA_PRINT_STRING (stream
, unresolved_elttype
,
216 valaddr
+ embedded_offset
, len
,
222 fprintf_filtered (stream
, "{");
223 /* If this is a virtual function table, print the 0th
224 entry specially, and the rest of the members
226 if (cp_is_vtbl_ptr_type (elttype
))
229 fprintf_filtered (stream
, _("%d vtable entries"),
236 val_print_array_elements (type
, valaddr
+ embedded_offset
,
237 address
+ embedded_offset
,
239 original_value
, options
, i
);
240 fprintf_filtered (stream
, "}");
244 /* Array of unspecified length: treat like pointer to first
247 goto print_unpacked_pointer
;
249 case TYPE_CODE_MEMBERPTR
:
252 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
256 cp_print_class_member (valaddr
+ embedded_offset
, type
, stream
, "&");
259 case TYPE_CODE_METHODPTR
:
260 cplus_print_method_ptr (valaddr
+ embedded_offset
, type
, stream
);
264 if (options
->format
&& options
->format
!= 's')
266 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
270 if (options
->vtblprint
&& cp_is_vtbl_ptr_type (type
))
272 /* Print the unmangled name if desired. */
273 /* Print vtable entry - we only get here if we ARE using
274 -fvtable_thunks. (Otherwise, look under
275 TYPE_CODE_STRUCT.) */
277 = extract_typed_address (valaddr
+ embedded_offset
, type
);
279 print_function_pointer_address (gdbarch
, addr
, stream
,
280 options
->addressprint
);
283 unresolved_elttype
= TYPE_TARGET_TYPE (type
);
284 elttype
= check_typedef (unresolved_elttype
);
286 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
287 print_unpacked_pointer
:
289 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
291 /* Try to print what function it points to. */
292 print_function_pointer_address (gdbarch
, addr
, stream
,
293 options
->addressprint
);
294 /* Return value is irrelevant except for string
299 if (options
->addressprint
)
300 fputs_filtered (paddress (gdbarch
, addr
), stream
);
302 /* For a pointer to a textual type, also print the string
303 pointed to, unless pointer is null. */
305 if (c_textual_element_type (unresolved_elttype
,
309 i
= val_print_string (unresolved_elttype
, NULL
,
313 else if (cp_is_vtbl_member (type
))
315 /* Print vtbl's nicely. */
316 CORE_ADDR vt_address
= unpack_pointer (type
,
320 struct minimal_symbol
*msymbol
=
321 lookup_minimal_symbol_by_pc (vt_address
);
322 if ((msymbol
!= NULL
)
323 && (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
325 fputs_filtered (" <", stream
);
326 fputs_filtered (SYMBOL_PRINT_NAME (msymbol
), stream
);
327 fputs_filtered (">", stream
);
329 if (vt_address
&& options
->vtblprint
)
331 struct value
*vt_val
;
332 struct symbol
*wsym
= (struct symbol
*) NULL
;
334 struct block
*block
= (struct block
*) NULL
;
338 wsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol
),
344 wtype
= SYMBOL_TYPE (wsym
);
348 wtype
= unresolved_elttype
;
350 vt_val
= value_at (wtype
, vt_address
);
351 common_val_print (vt_val
, stream
, recurse
+ 1,
352 options
, current_language
);
355 fprintf_filtered (stream
, "\n");
356 print_spaces_filtered (2 + 2 * recurse
, stream
);
361 /* Return number of characters printed, including the
362 terminating '\0' if we reached the end. val_print_string
363 takes care including the terminating '\0' if
370 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
371 if (options
->addressprint
)
374 = extract_typed_address (valaddr
+ embedded_offset
, type
);
376 fprintf_filtered (stream
, "@");
377 fputs_filtered (paddress (gdbarch
, addr
), stream
);
378 if (options
->deref_ref
)
379 fputs_filtered (": ", stream
);
381 /* De-reference the reference. */
382 if (options
->deref_ref
)
384 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
386 struct value
*deref_val
=
388 (TYPE_TARGET_TYPE (type
),
389 unpack_pointer (type
, valaddr
+ embedded_offset
));
391 common_val_print (deref_val
, stream
, recurse
, options
,
395 fputs_filtered ("???", stream
);
399 case TYPE_CODE_UNION
:
400 if (recurse
&& !options
->unionprint
)
402 fprintf_filtered (stream
, "{...}");
406 case TYPE_CODE_STRUCT
:
407 /*FIXME: Abstract this away */
408 if (options
->vtblprint
&& cp_is_vtbl_ptr_type (type
))
410 /* Print the unmangled name if desired. */
411 /* Print vtable entry - we only get here if NOT using
412 -fvtable_thunks. (Otherwise, look under
414 int offset
= (embedded_offset
415 + TYPE_FIELD_BITPOS (type
,
416 VTBL_FNADDR_OFFSET
) / 8);
417 struct type
*field_type
= TYPE_FIELD_TYPE (type
,
420 = extract_typed_address (valaddr
+ offset
, field_type
);
422 print_function_pointer_address (gdbarch
, addr
, stream
,
423 options
->addressprint
);
426 cp_print_value_fields_rtti (type
, valaddr
,
427 embedded_offset
, address
,
429 original_value
, options
,
436 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
440 len
= TYPE_NFIELDS (type
);
441 val
= unpack_long (type
, valaddr
+ embedded_offset
);
442 for (i
= 0; i
< len
; i
++)
445 if (val
== TYPE_FIELD_BITPOS (type
, i
))
452 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
456 print_longest (stream
, 'd', 0, val
);
460 case TYPE_CODE_FLAGS
:
462 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
465 val_print_type_code_flags (type
, valaddr
+ embedded_offset
,
470 case TYPE_CODE_METHOD
:
473 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
477 /* FIXME, we should consider, at least for ANSI C language,
478 eliminating the distinction made between FUNCs and POINTERs
480 fprintf_filtered (stream
, "{");
481 type_print (type
, "", stream
, -1);
482 fprintf_filtered (stream
, "} ");
483 /* Try to print what function it points to, and its address. */
484 print_address_demangle (gdbarch
, address
, stream
, demangle
);
488 if (options
->format
|| options
->output_format
)
490 struct value_print_options opts
= *options
;
491 opts
.format
= (options
->format
? options
->format
492 : options
->output_format
);
493 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
498 val
= unpack_long (type
, valaddr
+ embedded_offset
);
500 fputs_filtered ("false", stream
);
502 fputs_filtered ("true", stream
);
504 print_longest (stream
, 'd', 0, val
);
508 case TYPE_CODE_RANGE
:
509 /* FIXME: create_range_type does not set the unsigned bit in a
510 range type (I think it probably should copy it from the
511 target type), so we won't print values which are too large to
512 fit in a signed integer correctly. */
513 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
514 print with the target type, though, because the size of our
515 type and the target type might differ). */
519 if (options
->format
|| options
->output_format
)
521 struct value_print_options opts
= *options
;
523 opts
.format
= (options
->format
? options
->format
524 : options
->output_format
);
525 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
530 val_print_type_code_int (type
, valaddr
+ embedded_offset
,
532 /* C and C++ has no single byte int type, char is used
533 instead. Since we don't know whether the value is really
534 intended to be used as an integer or a character, print
535 the character equivalent as well. */
536 if (c_textual_element_type (unresolved_type
, options
->format
))
538 fputs_filtered (" ", stream
);
539 LA_PRINT_CHAR ((unsigned char) unpack_long (type
,
542 unresolved_type
, stream
);
548 if (options
->format
|| options
->output_format
)
550 struct value_print_options opts
= *options
;
551 opts
.format
= (options
->format
? options
->format
552 : options
->output_format
);
553 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
558 val
= unpack_long (type
, valaddr
+ embedded_offset
);
559 if (TYPE_UNSIGNED (type
))
560 fprintf_filtered (stream
, "%u", (unsigned int) val
);
562 fprintf_filtered (stream
, "%d", (int) val
);
563 fputs_filtered (" ", stream
);
564 LA_PRINT_CHAR ((unsigned char) val
, unresolved_type
, stream
);
571 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
576 print_floating (valaddr
+ embedded_offset
, type
, stream
);
580 case TYPE_CODE_DECFLOAT
:
582 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
585 print_decimal_floating (valaddr
+ embedded_offset
,
590 fprintf_filtered (stream
, "void");
593 case TYPE_CODE_ERROR
:
594 fprintf_filtered (stream
, "%s", TYPE_ERROR_NAME (type
));
597 case TYPE_CODE_UNDEF
:
598 /* This happens (without TYPE_FLAG_STUB set) on systems which
599 don't use dbx xrefs (NO_DBX_XREFS in gcc) if a file has a
600 "struct foo *bar" and no complete type for struct foo in that
602 fprintf_filtered (stream
, _("<incomplete type>"));
605 case TYPE_CODE_COMPLEX
:
607 print_scalar_formatted (valaddr
+ embedded_offset
,
608 TYPE_TARGET_TYPE (type
),
611 print_floating (valaddr
+ embedded_offset
,
612 TYPE_TARGET_TYPE (type
),
614 fprintf_filtered (stream
, " + ");
616 print_scalar_formatted (valaddr
+ embedded_offset
617 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
618 TYPE_TARGET_TYPE (type
),
621 print_floating (valaddr
+ embedded_offset
622 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
623 TYPE_TARGET_TYPE (type
),
625 fprintf_filtered (stream
, " * I");
629 error (_("Invalid C/C++ type code %d in symbol table."),
637 c_value_print (struct value
*val
, struct ui_file
*stream
,
638 const struct value_print_options
*options
)
640 struct type
*type
, *real_type
, *val_type
;
641 int full
, top
, using_enc
;
642 struct value_print_options opts
= *options
;
646 /* If it is a pointer, indicate what it points to.
648 Print type also if it is a reference.
650 C++: if it is a member pointer, we will take care
651 of that when we print it. */
653 /* Preserve the original type before stripping typedefs. We prefer
654 to pass down the original type when possible, but for local
655 checks it is better to look past the typedefs. */
656 val_type
= value_type (val
);
657 type
= check_typedef (val_type
);
659 if (TYPE_CODE (type
) == TYPE_CODE_PTR
660 || TYPE_CODE (type
) == TYPE_CODE_REF
)
662 /* Hack: remove (char *) for char strings. Their
663 type is indicated by the quoted string anyway.
664 (Don't use c_textual_element_type here; quoted strings
665 are always exactly (char *), (wchar_t *), or the like. */
666 if (TYPE_CODE (val_type
) == TYPE_CODE_PTR
667 && TYPE_NAME (val_type
) == NULL
668 && TYPE_NAME (TYPE_TARGET_TYPE (val_type
)) != NULL
669 && (strcmp (TYPE_NAME (TYPE_TARGET_TYPE (val_type
)),
671 || textual_name (TYPE_NAME (TYPE_TARGET_TYPE (val_type
)))))
675 else if (options
->objectprint
676 && (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
679 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
681 /* Copy value, change to pointer, so we don't get an
682 error about a non-pointer type in
683 value_rtti_target_type. */
684 struct value
*temparg
;
685 temparg
=value_copy(val
);
686 deprecated_set_value_type
687 (temparg
, lookup_pointer_type (TYPE_TARGET_TYPE (type
)));
690 /* Pointer to class, check real type of object. */
691 fprintf_filtered (stream
, "(");
692 real_type
= value_rtti_target_type (val
, &full
,
696 /* RTTI entry found. */
697 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
699 /* Create a pointer type pointing to the real
701 type
= lookup_pointer_type (real_type
);
705 /* Create a reference type referencing the real
707 type
= lookup_reference_type (real_type
);
709 /* JYG: Need to adjust pointer value. */
710 /* NOTE: cagney/2005-01-02: THIS IS BOGUS. */
711 value_contents_writeable (val
)[0] -= top
;
713 /* Note: When we look up RTTI entries, we don't get any
714 information on const or volatile attributes. */
716 type_print (type
, "", stream
, -1);
717 fprintf_filtered (stream
, ") ");
723 fprintf_filtered (stream
, "(");
724 type_print (value_type (val
), "", stream
, -1);
725 fprintf_filtered (stream
, ") ");
729 if (!value_initialized (val
))
730 fprintf_filtered (stream
, " [uninitialized] ");
732 if (options
->objectprint
&& (TYPE_CODE (type
) == TYPE_CODE_CLASS
))
734 /* Attempt to determine real type of object. */
735 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
738 /* We have RTTI information, so use it. */
739 val
= value_full_object (val
, real_type
,
740 full
, top
, using_enc
);
741 fprintf_filtered (stream
, "(%s%s) ",
742 TYPE_NAME (real_type
),
743 full
? "" : _(" [incomplete object]"));
744 /* Print out object: enclosing type is same as real_type if
746 return val_print (value_enclosing_type (val
),
747 value_contents_for_printing (val
), 0,
748 value_address (val
), stream
, 0,
749 val
, &opts
, current_language
);
750 /* Note: When we look up RTTI entries, we don't get any
751 information on const or volatile attributes. */
753 else if (type
!= check_typedef (value_enclosing_type (val
)))
755 /* No RTTI information, so let's do our best. */
756 fprintf_filtered (stream
, "(%s ?) ",
757 TYPE_NAME (value_enclosing_type (val
)));
758 return val_print (value_enclosing_type (val
),
759 value_contents_for_printing (val
), 0,
760 value_address (val
), stream
, 0,
761 val
, &opts
, current_language
);
763 /* Otherwise, we end up at the return outside this "if". */
766 return val_print (val_type
, value_contents_for_printing (val
),
767 value_embedded_offset (val
),
770 val
, &opts
, current_language
);