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
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 c_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 c_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 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
157 unsigned int i
= 0; /* Number of characters printed */
159 struct type
*elttype
, *unresolved_elttype
;
160 struct type
*unresolved_type
= type
;
165 CHECK_TYPEDEF (type
);
166 switch (TYPE_CODE (type
))
168 case TYPE_CODE_ARRAY
:
169 unresolved_elttype
= TYPE_TARGET_TYPE (type
);
170 elttype
= check_typedef (unresolved_elttype
);
171 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (unresolved_elttype
) > 0)
173 eltlen
= TYPE_LENGTH (elttype
);
174 len
= TYPE_LENGTH (type
) / eltlen
;
175 if (options
->prettyprint_arrays
)
177 print_spaces_filtered (2 + 2 * recurse
, stream
);
180 /* Print arrays of textual chars with a string syntax. */
181 if (c_textual_element_type (unresolved_elttype
, options
->format
))
183 /* If requested, look for the first null char and only print
184 elements up to it. */
185 if (options
->stop_print_at_null
)
187 unsigned int temp_len
;
191 && temp_len
< options
->print_max
192 && extract_unsigned_integer (valaddr
+ embedded_offset
194 eltlen
, byte_order
) != 0);
200 LA_PRINT_STRING (stream
, unresolved_elttype
,
201 valaddr
+ embedded_offset
, len
,
207 fprintf_filtered (stream
, "{");
208 /* If this is a virtual function table, print the 0th
209 entry specially, and the rest of the members normally. */
210 if (cp_is_vtbl_ptr_type (elttype
))
213 fprintf_filtered (stream
, _("%d vtable entries"), len
- 1);
219 val_print_array_elements (type
, valaddr
+ embedded_offset
, address
, stream
,
220 recurse
, options
, i
);
221 fprintf_filtered (stream
, "}");
225 /* Array of unspecified length: treat like pointer to first elt. */
227 goto print_unpacked_pointer
;
229 case TYPE_CODE_MEMBERPTR
:
232 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
236 cp_print_class_member (valaddr
+ embedded_offset
, type
, stream
, "&");
239 case TYPE_CODE_METHODPTR
:
240 cplus_print_method_ptr (valaddr
+ embedded_offset
, type
, stream
);
244 if (options
->format
&& options
->format
!= 's')
246 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
250 if (options
->vtblprint
&& cp_is_vtbl_ptr_type (type
))
252 /* Print the unmangled name if desired. */
253 /* Print vtable entry - we only get here if we ARE using
254 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
256 = extract_typed_address (valaddr
+ embedded_offset
, type
);
257 print_function_pointer_address (gdbarch
, addr
, stream
,
258 options
->addressprint
);
261 unresolved_elttype
= TYPE_TARGET_TYPE (type
);
262 elttype
= check_typedef (unresolved_elttype
);
264 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
265 print_unpacked_pointer
:
267 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
269 /* Try to print what function it points to. */
270 print_function_pointer_address (gdbarch
, addr
, stream
,
271 options
->addressprint
);
272 /* Return value is irrelevant except for string pointers. */
276 if (options
->addressprint
)
277 fputs_filtered (paddress (gdbarch
, addr
), stream
);
279 /* For a pointer to a textual type, also print the string
280 pointed to, unless pointer is null. */
282 if (c_textual_element_type (unresolved_elttype
, options
->format
)
285 i
= val_print_string (unresolved_elttype
, addr
, -1, stream
,
288 else if (cp_is_vtbl_member (type
))
290 /* print vtbl's nicely */
291 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
293 struct minimal_symbol
*msymbol
=
294 lookup_minimal_symbol_by_pc (vt_address
);
295 if ((msymbol
!= NULL
)
296 && (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
298 fputs_filtered (" <", stream
);
299 fputs_filtered (SYMBOL_PRINT_NAME (msymbol
), stream
);
300 fputs_filtered (">", stream
);
302 if (vt_address
&& options
->vtblprint
)
304 struct value
*vt_val
;
305 struct symbol
*wsym
= (struct symbol
*) NULL
;
307 struct block
*block
= (struct block
*) NULL
;
311 wsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol
), block
,
312 VAR_DOMAIN
, &is_this_fld
);
316 wtype
= SYMBOL_TYPE (wsym
);
320 wtype
= unresolved_elttype
;
322 vt_val
= value_at (wtype
, vt_address
);
323 common_val_print (vt_val
, stream
, recurse
+ 1, options
,
327 fprintf_filtered (stream
, "\n");
328 print_spaces_filtered (2 + 2 * recurse
, stream
);
333 /* Return number of characters printed, including the terminating
334 '\0' if we reached the end. val_print_string takes care including
335 the terminating '\0' if necessary. */
341 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
342 if (options
->addressprint
)
345 = extract_typed_address (valaddr
+ embedded_offset
, type
);
346 fprintf_filtered (stream
, "@");
347 fputs_filtered (paddress (gdbarch
, addr
), stream
);
348 if (options
->deref_ref
)
349 fputs_filtered (": ", stream
);
351 /* De-reference the reference. */
352 if (options
->deref_ref
)
354 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
356 struct value
*deref_val
=
358 (TYPE_TARGET_TYPE (type
),
359 unpack_pointer (type
, valaddr
+ embedded_offset
));
360 common_val_print (deref_val
, stream
, recurse
, options
,
364 fputs_filtered ("???", stream
);
368 case TYPE_CODE_UNION
:
369 if (recurse
&& !options
->unionprint
)
371 fprintf_filtered (stream
, "{...}");
375 case TYPE_CODE_STRUCT
:
376 /*FIXME: Abstract this away */
377 if (options
->vtblprint
&& cp_is_vtbl_ptr_type (type
))
379 /* Print the unmangled name if desired. */
380 /* Print vtable entry - we only get here if NOT using
381 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
382 int offset
= (embedded_offset
+
383 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8);
384 struct type
*field_type
= TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
);
386 = extract_typed_address (valaddr
+ offset
, field_type
);
388 print_function_pointer_address (gdbarch
, addr
, stream
,
389 options
->addressprint
);
392 cp_print_value_fields_rtti (type
, valaddr
,
393 embedded_offset
, address
, stream
,
394 recurse
, options
, NULL
, 0);
400 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
404 len
= TYPE_NFIELDS (type
);
405 val
= unpack_long (type
, valaddr
+ embedded_offset
);
406 for (i
= 0; i
< len
; i
++)
409 if (val
== TYPE_FIELD_BITPOS (type
, i
))
416 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
420 print_longest (stream
, 'd', 0, val
);
424 case TYPE_CODE_FLAGS
:
426 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
429 val_print_type_code_flags (type
, valaddr
+ embedded_offset
, stream
);
433 case TYPE_CODE_METHOD
:
436 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
440 /* FIXME, we should consider, at least for ANSI C language, eliminating
441 the distinction made between FUNCs and POINTERs to FUNCs. */
442 fprintf_filtered (stream
, "{");
443 type_print (type
, "", stream
, -1);
444 fprintf_filtered (stream
, "} ");
445 /* Try to print what function it points to, and its address. */
446 print_address_demangle (gdbarch
, address
, stream
, demangle
);
450 if (options
->format
|| options
->output_format
)
452 struct value_print_options opts
= *options
;
453 opts
.format
= (options
->format
? options
->format
454 : options
->output_format
);
455 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
460 val
= unpack_long (type
, valaddr
+ embedded_offset
);
462 fputs_filtered ("false", stream
);
464 fputs_filtered ("true", stream
);
466 print_longest (stream
, 'd', 0, val
);
470 case TYPE_CODE_RANGE
:
471 /* FIXME: create_range_type does not set the unsigned bit in a
472 range type (I think it probably should copy it from the target
473 type), so we won't print values which are too large to
474 fit in a signed integer correctly. */
475 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
476 print with the target type, though, because the size of our type
477 and the target type might differ). */
481 if (options
->format
|| options
->output_format
)
483 struct value_print_options opts
= *options
;
484 opts
.format
= (options
->format
? options
->format
485 : options
->output_format
);
486 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
491 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
492 /* C and C++ has no single byte int type, char is used instead.
493 Since we don't know whether the value is really intended to
494 be used as an integer or a character, print the character
495 equivalent as well. */
496 if (c_textual_element_type (unresolved_type
, options
->format
))
498 fputs_filtered (" ", stream
);
499 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
500 unresolved_type
, stream
);
506 if (options
->format
|| options
->output_format
)
508 struct value_print_options opts
= *options
;
509 opts
.format
= (options
->format
? options
->format
510 : options
->output_format
);
511 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
516 val
= unpack_long (type
, valaddr
+ embedded_offset
);
517 if (TYPE_UNSIGNED (type
))
518 fprintf_filtered (stream
, "%u", (unsigned int) val
);
520 fprintf_filtered (stream
, "%d", (int) val
);
521 fputs_filtered (" ", stream
);
522 LA_PRINT_CHAR ((unsigned char) val
, unresolved_type
, stream
);
529 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
534 print_floating (valaddr
+ embedded_offset
, type
, stream
);
538 case TYPE_CODE_DECFLOAT
:
540 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
543 print_decimal_floating (valaddr
+ embedded_offset
, type
, stream
);
547 fprintf_filtered (stream
, "void");
550 case TYPE_CODE_ERROR
:
551 fprintf_filtered (stream
, _("<error type>"));
554 case TYPE_CODE_UNDEF
:
555 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
556 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
557 and no complete type for struct foo in that file. */
558 fprintf_filtered (stream
, _("<incomplete type>"));
561 case TYPE_CODE_COMPLEX
:
563 print_scalar_formatted (valaddr
+ embedded_offset
,
564 TYPE_TARGET_TYPE (type
),
567 print_floating (valaddr
+ embedded_offset
, TYPE_TARGET_TYPE (type
),
569 fprintf_filtered (stream
, " + ");
571 print_scalar_formatted (valaddr
+ embedded_offset
572 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
573 TYPE_TARGET_TYPE (type
),
576 print_floating (valaddr
+ embedded_offset
577 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
578 TYPE_TARGET_TYPE (type
),
580 fprintf_filtered (stream
, " * I");
584 error (_("Invalid C/C++ type code %d in symbol table."), TYPE_CODE (type
));
591 c_value_print (struct value
*val
, struct ui_file
*stream
,
592 const struct value_print_options
*options
)
594 struct type
*type
, *real_type
, *val_type
;
595 int full
, top
, using_enc
;
596 struct value_print_options opts
= *options
;
600 /* If it is a pointer, indicate what it points to.
602 Print type also if it is a reference.
604 C++: if it is a member pointer, we will take care
605 of that when we print it. */
607 /* Preserve the original type before stripping typedefs. We prefer
608 to pass down the original type when possible, but for local
609 checks it is better to look past the typedefs. */
610 val_type
= value_type (val
);
611 type
= check_typedef (val_type
);
613 if (TYPE_CODE (type
) == TYPE_CODE_PTR
614 || TYPE_CODE (type
) == TYPE_CODE_REF
)
616 /* Hack: remove (char *) for char strings. Their
617 type is indicated by the quoted string anyway.
618 (Don't use c_textual_element_type here; quoted strings
619 are always exactly (char *), (wchar_t *), or the like. */
620 if (TYPE_CODE (val_type
) == TYPE_CODE_PTR
621 && TYPE_NAME (val_type
) == NULL
622 && TYPE_NAME (TYPE_TARGET_TYPE (val_type
)) != NULL
623 && (strcmp (TYPE_NAME (TYPE_TARGET_TYPE (val_type
)), "char") == 0
624 || textual_name (TYPE_NAME (TYPE_TARGET_TYPE (val_type
)))))
628 else if (options
->objectprint
629 && (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
632 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
634 /* Copy value, change to pointer, so we don't get an
635 * error about a non-pointer type in value_rtti_target_type
637 struct value
*temparg
;
638 temparg
=value_copy(val
);
639 deprecated_set_value_type (temparg
, lookup_pointer_type (TYPE_TARGET_TYPE(type
)));
642 /* Pointer to class, check real type of object */
643 fprintf_filtered (stream
, "(");
644 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
647 /* RTTI entry found */
648 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
650 /* create a pointer type pointing to the real type */
651 type
= lookup_pointer_type (real_type
);
655 /* create a reference type referencing the real type */
656 type
= lookup_reference_type (real_type
);
658 /* JYG: Need to adjust pointer value. */
659 /* NOTE: cagney/2005-01-02: THIS IS BOGUS. */
660 value_contents_writeable (val
)[0] -= top
;
662 /* Note: When we look up RTTI entries, we don't get any
663 information on const or volatile attributes */
665 type_print (type
, "", stream
, -1);
666 fprintf_filtered (stream
, ") ");
672 fprintf_filtered (stream
, "(");
673 type_print (value_type (val
), "", stream
, -1);
674 fprintf_filtered (stream
, ") ");
678 if (!value_initialized (val
))
679 fprintf_filtered (stream
, " [uninitialized] ");
681 if (options
->objectprint
&& (TYPE_CODE (type
) == TYPE_CODE_CLASS
))
683 /* Attempt to determine real type of object */
684 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
687 /* We have RTTI information, so use it */
688 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
689 fprintf_filtered (stream
, "(%s%s) ",
690 TYPE_NAME (real_type
),
691 full
? "" : _(" [incomplete object]"));
692 /* Print out object: enclosing type is same as real_type if full */
693 return val_print (value_enclosing_type (val
),
694 value_contents_all (val
), 0,
695 value_address (val
), stream
, 0,
696 &opts
, current_language
);
697 /* Note: When we look up RTTI entries, we don't get any information on
698 const or volatile attributes */
700 else if (type
!= check_typedef (value_enclosing_type (val
)))
702 /* No RTTI information, so let's do our best */
703 fprintf_filtered (stream
, "(%s ?) ",
704 TYPE_NAME (value_enclosing_type (val
)));
705 return val_print (value_enclosing_type (val
),
706 value_contents_all (val
), 0,
707 value_address (val
), stream
, 0,
708 &opts
, current_language
);
710 /* Otherwise, we end up at the return outside this "if" */
713 return val_print (val_type
, value_contents_all (val
),
714 value_embedded_offset (val
),
716 stream
, 0, &opts
, current_language
);
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