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
);
258 print_function_pointer_address (gdbarch
, addr
, stream
,
259 options
->addressprint
);
262 unresolved_elttype
= TYPE_TARGET_TYPE (type
);
263 elttype
= check_typedef (unresolved_elttype
);
265 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
266 print_unpacked_pointer
:
268 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
270 /* Try to print what function it points to. */
271 print_function_pointer_address (gdbarch
, addr
, stream
,
272 options
->addressprint
);
273 /* Return value is irrelevant except for string pointers. */
277 if (options
->addressprint
)
278 fputs_filtered (paddress (gdbarch
, addr
), stream
);
280 /* For a pointer to a textual type, also print the string
281 pointed to, unless pointer is null. */
283 if (c_textual_element_type (unresolved_elttype
, options
->format
)
286 i
= val_print_string (unresolved_elttype
, addr
, -1, stream
,
289 else if (cp_is_vtbl_member (type
))
291 /* print vtbl's nicely */
292 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
294 struct minimal_symbol
*msymbol
=
295 lookup_minimal_symbol_by_pc (vt_address
);
296 if ((msymbol
!= NULL
)
297 && (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
299 fputs_filtered (" <", stream
);
300 fputs_filtered (SYMBOL_PRINT_NAME (msymbol
), stream
);
301 fputs_filtered (">", stream
);
303 if (vt_address
&& options
->vtblprint
)
305 struct value
*vt_val
;
306 struct symbol
*wsym
= (struct symbol
*) NULL
;
308 struct block
*block
= (struct block
*) NULL
;
312 wsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol
), block
,
313 VAR_DOMAIN
, &is_this_fld
);
317 wtype
= SYMBOL_TYPE (wsym
);
321 wtype
= unresolved_elttype
;
323 vt_val
= value_at (wtype
, vt_address
);
324 common_val_print (vt_val
, stream
, recurse
+ 1, options
,
328 fprintf_filtered (stream
, "\n");
329 print_spaces_filtered (2 + 2 * recurse
, stream
);
334 /* Return number of characters printed, including the terminating
335 '\0' if we reached the end. val_print_string takes care including
336 the terminating '\0' if necessary. */
342 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
343 if (options
->addressprint
)
346 = extract_typed_address (valaddr
+ embedded_offset
, type
);
348 fprintf_filtered (stream
, "@");
349 fputs_filtered (paddress (gdbarch
, addr
), stream
);
350 if (options
->deref_ref
)
351 fputs_filtered (": ", stream
);
353 /* De-reference the reference. */
354 if (options
->deref_ref
)
356 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
358 struct value
*deref_val
=
360 (TYPE_TARGET_TYPE (type
),
361 unpack_pointer (type
, valaddr
+ embedded_offset
));
363 common_val_print (deref_val
, stream
, recurse
, options
,
367 fputs_filtered ("???", stream
);
371 case TYPE_CODE_UNION
:
372 if (recurse
&& !options
->unionprint
)
374 fprintf_filtered (stream
, "{...}");
378 case TYPE_CODE_STRUCT
:
379 /*FIXME: Abstract this away */
380 if (options
->vtblprint
&& cp_is_vtbl_ptr_type (type
))
382 /* Print the unmangled name if desired. */
383 /* Print vtable entry - we only get here if NOT using
384 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
385 int offset
= (embedded_offset
+
386 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8);
387 struct type
*field_type
= TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
);
389 = extract_typed_address (valaddr
+ offset
, field_type
);
391 print_function_pointer_address (gdbarch
, addr
, stream
,
392 options
->addressprint
);
395 cp_print_value_fields_rtti (type
, valaddr
,
396 embedded_offset
, address
, stream
,
397 recurse
, options
, NULL
, 0);
403 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
407 len
= TYPE_NFIELDS (type
);
408 val
= unpack_long (type
, valaddr
+ embedded_offset
);
409 for (i
= 0; i
< len
; i
++)
412 if (val
== TYPE_FIELD_BITPOS (type
, i
))
419 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
423 print_longest (stream
, 'd', 0, val
);
427 case TYPE_CODE_FLAGS
:
429 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
432 val_print_type_code_flags (type
, valaddr
+ embedded_offset
, stream
);
436 case TYPE_CODE_METHOD
:
439 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
443 /* FIXME, we should consider, at least for ANSI C language, eliminating
444 the distinction made between FUNCs and POINTERs to FUNCs. */
445 fprintf_filtered (stream
, "{");
446 type_print (type
, "", stream
, -1);
447 fprintf_filtered (stream
, "} ");
448 /* Try to print what function it points to, and its address. */
449 print_address_demangle (gdbarch
, address
, stream
, demangle
);
453 if (options
->format
|| options
->output_format
)
455 struct value_print_options opts
= *options
;
456 opts
.format
= (options
->format
? options
->format
457 : options
->output_format
);
458 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
463 val
= unpack_long (type
, valaddr
+ embedded_offset
);
465 fputs_filtered ("false", stream
);
467 fputs_filtered ("true", stream
);
469 print_longest (stream
, 'd', 0, val
);
473 case TYPE_CODE_RANGE
:
474 /* FIXME: create_range_type does not set the unsigned bit in a
475 range type (I think it probably should copy it from the target
476 type), so we won't print values which are too large to
477 fit in a signed integer correctly. */
478 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
479 print with the target type, though, because the size of our type
480 and the target type might differ). */
484 if (options
->format
|| options
->output_format
)
486 struct value_print_options opts
= *options
;
488 opts
.format
= (options
->format
? options
->format
489 : options
->output_format
);
490 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
495 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
496 /* C and C++ has no single byte int type, char is used instead.
497 Since we don't know whether the value is really intended to
498 be used as an integer or a character, print the character
499 equivalent as well. */
500 if (c_textual_element_type (unresolved_type
, options
->format
))
502 fputs_filtered (" ", stream
);
503 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
504 unresolved_type
, stream
);
510 if (options
->format
|| options
->output_format
)
512 struct value_print_options opts
= *options
;
513 opts
.format
= (options
->format
? options
->format
514 : options
->output_format
);
515 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
520 val
= unpack_long (type
, valaddr
+ embedded_offset
);
521 if (TYPE_UNSIGNED (type
))
522 fprintf_filtered (stream
, "%u", (unsigned int) val
);
524 fprintf_filtered (stream
, "%d", (int) val
);
525 fputs_filtered (" ", stream
);
526 LA_PRINT_CHAR ((unsigned char) val
, unresolved_type
, stream
);
533 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
538 print_floating (valaddr
+ embedded_offset
, type
, stream
);
542 case TYPE_CODE_DECFLOAT
:
544 print_scalar_formatted (valaddr
+ embedded_offset
, type
,
547 print_decimal_floating (valaddr
+ embedded_offset
, type
, stream
);
551 fprintf_filtered (stream
, "void");
554 case TYPE_CODE_ERROR
:
555 fprintf_filtered (stream
, _("<error type>"));
558 case TYPE_CODE_UNDEF
:
559 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
560 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
561 and no complete type for struct foo in that file. */
562 fprintf_filtered (stream
, _("<incomplete type>"));
565 case TYPE_CODE_COMPLEX
:
567 print_scalar_formatted (valaddr
+ embedded_offset
,
568 TYPE_TARGET_TYPE (type
),
571 print_floating (valaddr
+ embedded_offset
, TYPE_TARGET_TYPE (type
),
573 fprintf_filtered (stream
, " + ");
575 print_scalar_formatted (valaddr
+ embedded_offset
576 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
577 TYPE_TARGET_TYPE (type
),
580 print_floating (valaddr
+ embedded_offset
581 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
582 TYPE_TARGET_TYPE (type
),
584 fprintf_filtered (stream
, " * I");
588 error (_("Invalid C/C++ type code %d in symbol table."), TYPE_CODE (type
));
595 c_value_print (struct value
*val
, struct ui_file
*stream
,
596 const struct value_print_options
*options
)
598 struct type
*type
, *real_type
, *val_type
;
599 int full
, top
, using_enc
;
600 struct value_print_options opts
= *options
;
604 /* If it is a pointer, indicate what it points to.
606 Print type also if it is a reference.
608 C++: if it is a member pointer, we will take care
609 of that when we print it. */
611 /* Preserve the original type before stripping typedefs. We prefer
612 to pass down the original type when possible, but for local
613 checks it is better to look past the typedefs. */
614 val_type
= value_type (val
);
615 type
= check_typedef (val_type
);
617 if (TYPE_CODE (type
) == TYPE_CODE_PTR
618 || TYPE_CODE (type
) == TYPE_CODE_REF
)
620 /* Hack: remove (char *) for char strings. Their
621 type is indicated by the quoted string anyway.
622 (Don't use c_textual_element_type here; quoted strings
623 are always exactly (char *), (wchar_t *), or the like. */
624 if (TYPE_CODE (val_type
) == TYPE_CODE_PTR
625 && TYPE_NAME (val_type
) == NULL
626 && TYPE_NAME (TYPE_TARGET_TYPE (val_type
)) != NULL
627 && (strcmp (TYPE_NAME (TYPE_TARGET_TYPE (val_type
)), "char") == 0
628 || textual_name (TYPE_NAME (TYPE_TARGET_TYPE (val_type
)))))
632 else if (options
->objectprint
633 && (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
636 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
638 /* Copy value, change to pointer, so we don't get an
639 * error about a non-pointer type in value_rtti_target_type
641 struct value
*temparg
;
642 temparg
=value_copy(val
);
643 deprecated_set_value_type (temparg
, lookup_pointer_type (TYPE_TARGET_TYPE(type
)));
646 /* Pointer to class, check real type of object */
647 fprintf_filtered (stream
, "(");
648 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
651 /* RTTI entry found */
652 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
654 /* create a pointer type pointing to the real type */
655 type
= lookup_pointer_type (real_type
);
659 /* create a reference type referencing the real type */
660 type
= lookup_reference_type (real_type
);
662 /* JYG: Need to adjust pointer value. */
663 /* NOTE: cagney/2005-01-02: THIS IS BOGUS. */
664 value_contents_writeable (val
)[0] -= top
;
666 /* Note: When we look up RTTI entries, we don't get any
667 information on const or volatile attributes */
669 type_print (type
, "", stream
, -1);
670 fprintf_filtered (stream
, ") ");
676 fprintf_filtered (stream
, "(");
677 type_print (value_type (val
), "", stream
, -1);
678 fprintf_filtered (stream
, ") ");
682 if (!value_initialized (val
))
683 fprintf_filtered (stream
, " [uninitialized] ");
685 if (options
->objectprint
&& (TYPE_CODE (type
) == TYPE_CODE_CLASS
))
687 /* Attempt to determine real type of object */
688 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
691 /* We have RTTI information, so use it */
692 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
693 fprintf_filtered (stream
, "(%s%s) ",
694 TYPE_NAME (real_type
),
695 full
? "" : _(" [incomplete object]"));
696 /* Print out object: enclosing type is same as real_type if full */
697 return val_print (value_enclosing_type (val
),
698 value_contents_all (val
), 0,
699 value_address (val
), stream
, 0,
700 &opts
, current_language
);
701 /* Note: When we look up RTTI entries, we don't get any information on
702 const or volatile attributes */
704 else if (type
!= check_typedef (value_enclosing_type (val
)))
706 /* No RTTI information, so let's do our best */
707 fprintf_filtered (stream
, "(%s ?) ",
708 TYPE_NAME (value_enclosing_type (val
)));
709 return val_print (value_enclosing_type (val
),
710 value_contents_all (val
), 0,
711 value_address (val
), stream
, 0,
712 &opts
, current_language
);
714 /* Otherwise, we end up at the return outside this "if" */
717 return val_print (val_type
, value_contents_all (val
),
718 value_embedded_offset (val
),
720 stream
, 0, &opts
, current_language
);
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