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 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 (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
, 0, options
);
206 fprintf_filtered (stream
, "{");
207 /* If this is a virtual function table, print the 0th
208 entry specially, and the rest of the members normally. */
209 if (cp_is_vtbl_ptr_type (elttype
))
212 fprintf_filtered (stream
, _("%d vtable entries"), len
- 1);
218 val_print_array_elements (type
, valaddr
+ embedded_offset
, address
, stream
,
219 recurse
, options
, i
);
220 fprintf_filtered (stream
, "}");
224 /* Array of unspecified length: treat like pointer to first elt. */
226 goto print_unpacked_pointer
;
228 case TYPE_CODE_MEMBERPTR
:
231 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
235 cp_print_class_member (valaddr
+ embedded_offset
, type
, stream
, "&");
238 case TYPE_CODE_METHODPTR
:
239 cplus_print_method_ptr (valaddr
+ embedded_offset
, type
, stream
);
243 if (options
->format
&& options
->format
!= 's')
245 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
249 if (options
->vtblprint
&& cp_is_vtbl_ptr_type (type
))
251 /* Print the unmangled name if desired. */
252 /* Print vtable entry - we only get here if we ARE using
253 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
255 = extract_typed_address (valaddr
+ embedded_offset
, type
);
256 print_function_pointer_address (gdbarch
, addr
, stream
,
257 options
->addressprint
);
260 unresolved_elttype
= TYPE_TARGET_TYPE (type
);
261 elttype
= check_typedef (unresolved_elttype
);
263 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
264 print_unpacked_pointer
:
266 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
268 /* Try to print what function it points to. */
269 print_function_pointer_address (gdbarch
, addr
, stream
,
270 options
->addressprint
);
271 /* Return value is irrelevant except for string pointers. */
275 if (options
->addressprint
)
276 fputs_filtered (paddress (gdbarch
, addr
), stream
);
278 /* For a pointer to a textual type, also print the string
279 pointed to, unless pointer is null. */
281 if (textual_element_type (unresolved_elttype
, options
->format
)
284 i
= val_print_string (unresolved_elttype
, addr
, -1, stream
,
287 else if (cp_is_vtbl_member (type
))
289 /* print vtbl's nicely */
290 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
292 struct minimal_symbol
*msymbol
=
293 lookup_minimal_symbol_by_pc (vt_address
);
294 if ((msymbol
!= NULL
) &&
295 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
297 fputs_filtered (" <", stream
);
298 fputs_filtered (SYMBOL_PRINT_NAME (msymbol
), stream
);
299 fputs_filtered (">", stream
);
301 if (vt_address
&& options
->vtblprint
)
303 struct value
*vt_val
;
304 struct symbol
*wsym
= (struct symbol
*) NULL
;
306 struct block
*block
= (struct block
*) NULL
;
310 wsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol
), block
,
311 VAR_DOMAIN
, &is_this_fld
);
315 wtype
= SYMBOL_TYPE (wsym
);
319 wtype
= unresolved_elttype
;
321 vt_val
= value_at (wtype
, vt_address
);
322 common_val_print (vt_val
, stream
, recurse
+ 1, options
,
326 fprintf_filtered (stream
, "\n");
327 print_spaces_filtered (2 + 2 * recurse
, stream
);
332 /* Return number of characters printed, including the terminating
333 '\0' if we reached the end. val_print_string takes care including
334 the terminating '\0' if necessary. */
340 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
341 if (options
->addressprint
)
344 = extract_typed_address (valaddr
+ embedded_offset
, type
);
345 fprintf_filtered (stream
, "@");
346 fputs_filtered (paddress (gdbarch
, addr
), stream
);
347 if (options
->deref_ref
)
348 fputs_filtered (": ", stream
);
350 /* De-reference the reference. */
351 if (options
->deref_ref
)
353 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
355 struct value
*deref_val
=
357 (TYPE_TARGET_TYPE (type
),
358 unpack_pointer (type
, valaddr
+ embedded_offset
));
359 common_val_print (deref_val
, stream
, recurse
, options
,
363 fputs_filtered ("???", stream
);
367 case TYPE_CODE_UNION
:
368 if (recurse
&& !options
->unionprint
)
370 fprintf_filtered (stream
, "{...}");
374 case TYPE_CODE_STRUCT
:
375 /*FIXME: Abstract this away */
376 if (options
->vtblprint
&& cp_is_vtbl_ptr_type (type
))
378 /* Print the unmangled name if desired. */
379 /* Print vtable entry - we only get here if NOT using
380 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
381 int offset
= (embedded_offset
+
382 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8);
383 struct type
*field_type
= TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
);
385 = extract_typed_address (valaddr
+ offset
, field_type
);
387 print_function_pointer_address (gdbarch
, addr
, stream
,
388 options
->addressprint
);
391 cp_print_value_fields (type
, type
, valaddr
, embedded_offset
, address
, stream
,
392 recurse
, options
, NULL
, 0);
398 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
402 len
= TYPE_NFIELDS (type
);
403 val
= unpack_long (type
, valaddr
+ embedded_offset
);
404 for (i
= 0; i
< len
; i
++)
407 if (val
== TYPE_FIELD_BITPOS (type
, i
))
414 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
418 print_longest (stream
, 'd', 0, val
);
422 case TYPE_CODE_FLAGS
:
424 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
427 val_print_type_code_flags (type
, valaddr
+ embedded_offset
, stream
);
431 case TYPE_CODE_METHOD
:
434 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
438 /* FIXME, we should consider, at least for ANSI C language, eliminating
439 the distinction made between FUNCs and POINTERs to FUNCs. */
440 fprintf_filtered (stream
, "{");
441 type_print (type
, "", stream
, -1);
442 fprintf_filtered (stream
, "} ");
443 /* Try to print what function it points to, and its address. */
444 print_address_demangle (gdbarch
, address
, stream
, demangle
);
448 if (options
->format
|| options
->output_format
)
450 struct value_print_options opts
= *options
;
451 opts
.format
= (options
->format
? options
->format
452 : options
->output_format
);
453 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
458 val
= unpack_long (type
, valaddr
+ embedded_offset
);
460 fputs_filtered ("false", stream
);
462 fputs_filtered ("true", stream
);
464 print_longest (stream
, 'd', 0, val
);
468 case TYPE_CODE_RANGE
:
469 /* FIXME: create_range_type does not set the unsigned bit in a
470 range type (I think it probably should copy it from the target
471 type), so we won't print values which are too large to
472 fit in a signed integer correctly. */
473 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
474 print with the target type, though, because the size of our type
475 and the target type might differ). */
479 if (options
->format
|| options
->output_format
)
481 struct value_print_options opts
= *options
;
482 opts
.format
= (options
->format
? options
->format
483 : options
->output_format
);
484 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
489 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
490 /* C and C++ has no single byte int type, char is used instead.
491 Since we don't know whether the value is really intended to
492 be used as an integer or a character, print the character
493 equivalent as well. */
494 if (textual_element_type (unresolved_type
, options
->format
))
496 fputs_filtered (" ", stream
);
497 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
498 unresolved_type
, stream
);
504 if (options
->format
|| options
->output_format
)
506 struct value_print_options opts
= *options
;
507 opts
.format
= (options
->format
? options
->format
508 : options
->output_format
);
509 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
514 val
= unpack_long (type
, valaddr
+ embedded_offset
);
515 if (TYPE_UNSIGNED (type
))
516 fprintf_filtered (stream
, "%u", (unsigned int) val
);
518 fprintf_filtered (stream
, "%d", (int) val
);
519 fputs_filtered (" ", stream
);
520 LA_PRINT_CHAR ((unsigned char) val
, unresolved_type
, stream
);
527 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
532 print_floating (valaddr
+ embedded_offset
, type
, stream
);
536 case TYPE_CODE_DECFLOAT
:
538 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
541 print_decimal_floating (valaddr
+ embedded_offset
, type
, stream
);
545 fprintf_filtered (stream
, "void");
548 case TYPE_CODE_ERROR
:
549 fprintf_filtered (stream
, _("<error type>"));
552 case TYPE_CODE_UNDEF
:
553 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
554 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
555 and no complete type for struct foo in that file. */
556 fprintf_filtered (stream
, _("<incomplete type>"));
559 case TYPE_CODE_COMPLEX
:
561 print_scalar_formatted (valaddr
+ embedded_offset
,
562 TYPE_TARGET_TYPE (type
),
565 print_floating (valaddr
+ embedded_offset
, TYPE_TARGET_TYPE (type
),
567 fprintf_filtered (stream
, " + ");
569 print_scalar_formatted (valaddr
+ embedded_offset
570 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
571 TYPE_TARGET_TYPE (type
),
574 print_floating (valaddr
+ embedded_offset
575 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
576 TYPE_TARGET_TYPE (type
),
578 fprintf_filtered (stream
, " * I");
582 error (_("Invalid C/C++ type code %d in symbol table."), TYPE_CODE (type
));
589 c_value_print (struct value
*val
, struct ui_file
*stream
,
590 const struct value_print_options
*options
)
592 struct type
*type
, *real_type
, *val_type
;
593 int full
, top
, using_enc
;
594 struct value_print_options opts
= *options
;
598 /* If it is a pointer, indicate what it points to.
600 Print type also if it is a reference.
602 C++: if it is a member pointer, we will take care
603 of that when we print it. */
605 /* Preserve the original type before stripping typedefs. We prefer
606 to pass down the original type when possible, but for local
607 checks it is better to look past the typedefs. */
608 val_type
= value_type (val
);
609 type
= check_typedef (val_type
);
611 if (TYPE_CODE (type
) == TYPE_CODE_PTR
612 || TYPE_CODE (type
) == TYPE_CODE_REF
)
614 /* Hack: remove (char *) for char strings. Their
615 type is indicated by the quoted string anyway.
616 (Don't use textual_element_type here; quoted strings
617 are always exactly (char *), (wchar_t *), or the like. */
618 if (TYPE_CODE (val_type
) == TYPE_CODE_PTR
619 && TYPE_NAME (val_type
) == NULL
620 && TYPE_NAME (TYPE_TARGET_TYPE (val_type
)) != NULL
621 && (strcmp (TYPE_NAME (TYPE_TARGET_TYPE (val_type
)), "char") == 0
622 || textual_name (TYPE_NAME (TYPE_TARGET_TYPE (val_type
)))))
626 else if (options
->objectprint
627 && (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
630 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
632 /* Copy value, change to pointer, so we don't get an
633 * error about a non-pointer type in value_rtti_target_type
635 struct value
*temparg
;
636 temparg
=value_copy(val
);
637 deprecated_set_value_type (temparg
, lookup_pointer_type (TYPE_TARGET_TYPE(type
)));
640 /* Pointer to class, check real type of object */
641 fprintf_filtered (stream
, "(");
642 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
645 /* RTTI entry found */
646 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
648 /* create a pointer type pointing to the real type */
649 type
= lookup_pointer_type (real_type
);
653 /* create a reference type referencing the real type */
654 type
= lookup_reference_type (real_type
);
656 /* JYG: Need to adjust pointer value. */
657 /* NOTE: cagney/2005-01-02: THIS IS BOGUS. */
658 value_contents_writeable (val
)[0] -= top
;
660 /* Note: When we look up RTTI entries, we don't get any
661 information on const or volatile attributes */
663 type_print (type
, "", stream
, -1);
664 fprintf_filtered (stream
, ") ");
670 fprintf_filtered (stream
, "(");
671 type_print (value_type (val
), "", stream
, -1);
672 fprintf_filtered (stream
, ") ");
676 if (!value_initialized (val
))
677 fprintf_filtered (stream
, " [uninitialized] ");
679 if (options
->objectprint
&& (TYPE_CODE (type
) == TYPE_CODE_CLASS
))
681 /* Attempt to determine real type of object */
682 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
685 /* We have RTTI information, so use it */
686 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
687 fprintf_filtered (stream
, "(%s%s) ",
688 TYPE_NAME (real_type
),
689 full
? "" : _(" [incomplete object]"));
690 /* Print out object: enclosing type is same as real_type if full */
691 return val_print (value_enclosing_type (val
),
692 value_contents_all (val
), 0,
693 value_address (val
), stream
, 0,
694 &opts
, current_language
);
695 /* Note: When we look up RTTI entries, we don't get any information on
696 const or volatile attributes */
698 else if (type
!= check_typedef (value_enclosing_type (val
)))
700 /* No RTTI information, so let's do our best */
701 fprintf_filtered (stream
, "(%s ?) ",
702 TYPE_NAME (value_enclosing_type (val
)));
703 return val_print (value_enclosing_type (val
),
704 value_contents_all (val
), 0,
705 value_address (val
), stream
, 0,
706 &opts
, current_language
);
708 /* Otherwise, we end up at the return outside this "if" */
711 return val_print (val_type
, value_contents_all (val
),
712 value_embedded_offset (val
),
714 stream
, 0, &opts
, current_language
);
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