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
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 (CORE_ADDR address
, struct ui_file
*stream
)
41 CORE_ADDR func_addr
= gdbarch_convert_from_func_ptr_addr (current_gdbarch
,
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 (address
), stream
);
51 fputs_filtered (": ", stream
);
53 print_address_demangle (func_addr
, stream
, demangle
);
57 /* Apply a heuristic to decide whether an array of TYPE or a pointer
58 to TYPE should be printed as a textual string. Return non-zero if
59 it should, or zero if it should be treated as an array of integers
60 or pointer to integers. FORMAT is the current format letter,
63 We guess that "char" is a character. Explicitly signed and
64 unsigned character types are also characters. Integer data from
65 vector types is not. The user can override this by using the /s
69 textual_element_type (struct type
*type
, char format
)
71 struct type
*true_type
= check_typedef (type
);
73 if (format
!= 0 && format
!= 's')
76 /* TYPE_CODE_CHAR is always textual. */
77 if (TYPE_CODE (true_type
) == TYPE_CODE_CHAR
)
82 /* Print this as a string if we can manage it. For now, no
83 wide character support. */
84 if (TYPE_CODE (true_type
) == TYPE_CODE_INT
85 && TYPE_LENGTH (true_type
) == 1)
90 /* If a one-byte TYPE_CODE_INT is missing the not-a-character
91 flag, then we treat it as text; otherwise, we assume it's
92 being used as data. */
93 if (TYPE_CODE (true_type
) == TYPE_CODE_INT
94 && TYPE_LENGTH (true_type
) == 1
95 && !TYPE_NOTTEXT (true_type
))
103 /* Print data of type TYPE located at VALADDR (within GDB), which came from
104 the inferior at address ADDRESS, onto stdio stream STREAM according to
105 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
108 If the data are a string pointer, returns the number of string characters
111 If DEREF_REF is nonzero, then dereference references, otherwise just print
114 The PRETTY parameter controls prettyprinting. */
117 c_val_print (struct type
*type
, const gdb_byte
*valaddr
, int embedded_offset
,
118 CORE_ADDR address
, struct ui_file
*stream
, int format
,
119 int deref_ref
, int recurse
, enum val_prettyprint pretty
)
121 unsigned int i
= 0; /* Number of characters printed */
123 struct type
*elttype
;
128 CHECK_TYPEDEF (type
);
129 switch (TYPE_CODE (type
))
131 case TYPE_CODE_ARRAY
:
132 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
133 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0)
135 eltlen
= TYPE_LENGTH (elttype
);
136 len
= TYPE_LENGTH (type
) / eltlen
;
137 if (prettyprint_arrays
)
139 print_spaces_filtered (2 + 2 * recurse
, stream
);
142 /* Print arrays of textual chars with a string syntax. */
143 if (textual_element_type (elttype
, format
))
145 /* If requested, look for the first null char and only print
146 elements up to it. */
147 if (stop_print_at_null
)
149 unsigned int temp_len
;
151 /* Look for a NULL char. */
153 (valaddr
+ embedded_offset
)[temp_len
]
154 && temp_len
< len
&& temp_len
< print_max
;
159 LA_PRINT_STRING (stream
, valaddr
+ embedded_offset
, len
, eltlen
, 0);
164 fprintf_filtered (stream
, "{");
165 /* If this is a virtual function table, print the 0th
166 entry specially, and the rest of the members normally. */
167 if (cp_is_vtbl_ptr_type (elttype
))
170 fprintf_filtered (stream
, _("%d vtable entries"), len
- 1);
176 val_print_array_elements (type
, valaddr
+ embedded_offset
, address
, stream
,
177 format
, deref_ref
, recurse
, pretty
, i
);
178 fprintf_filtered (stream
, "}");
182 /* Array of unspecified length: treat like pointer to first elt. */
184 goto print_unpacked_pointer
;
186 case TYPE_CODE_MEMBERPTR
:
189 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
192 cp_print_class_member (valaddr
+ embedded_offset
,
193 TYPE_DOMAIN_TYPE (type
),
197 case TYPE_CODE_METHODPTR
:
198 cplus_print_method_ptr (valaddr
+ embedded_offset
, type
, stream
);
202 if (format
&& format
!= 's')
204 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
207 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
209 /* Print the unmangled name if desired. */
210 /* Print vtable entry - we only get here if we ARE using
211 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
213 = extract_typed_address (valaddr
+ embedded_offset
, type
);
214 print_function_pointer_address (addr
, stream
);
217 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
219 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
220 print_unpacked_pointer
:
222 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
224 /* Try to print what function it points to. */
225 print_function_pointer_address (addr
, stream
);
226 /* Return value is irrelevant except for string pointers. */
231 fputs_filtered (paddress (addr
), stream
);
233 /* For a pointer to a textual type, also print the string
234 pointed to, unless pointer is null. */
235 /* FIXME: need to handle wchar_t here... */
237 if (textual_element_type (elttype
, format
) && addr
!= 0)
239 i
= val_print_string (addr
, -1, TYPE_LENGTH (elttype
), stream
);
241 else if (cp_is_vtbl_member (type
))
243 /* print vtbl's nicely */
244 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
246 struct minimal_symbol
*msymbol
=
247 lookup_minimal_symbol_by_pc (vt_address
);
248 if ((msymbol
!= NULL
) &&
249 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
251 fputs_filtered (" <", stream
);
252 fputs_filtered (SYMBOL_PRINT_NAME (msymbol
), stream
);
253 fputs_filtered (">", stream
);
255 if (vt_address
&& vtblprint
)
257 struct value
*vt_val
;
258 struct symbol
*wsym
= (struct symbol
*) NULL
;
260 struct block
*block
= (struct block
*) NULL
;
264 wsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (msymbol
), block
,
265 VAR_DOMAIN
, &is_this_fld
);
269 wtype
= SYMBOL_TYPE (wsym
);
273 wtype
= TYPE_TARGET_TYPE (type
);
275 vt_val
= value_at (wtype
, vt_address
);
276 common_val_print (vt_val
, stream
, format
,
277 deref_ref
, recurse
+ 1, pretty
,
281 fprintf_filtered (stream
, "\n");
282 print_spaces_filtered (2 + 2 * recurse
, stream
);
287 /* Return number of characters printed, including the terminating
288 '\0' if we reached the end. val_print_string takes care including
289 the terminating '\0' if necessary. */
295 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
299 = extract_typed_address (valaddr
+ embedded_offset
, type
);
300 fprintf_filtered (stream
, "@");
301 fputs_filtered (paddress (addr
), stream
);
303 fputs_filtered (": ", stream
);
305 /* De-reference the reference. */
308 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
310 struct value
*deref_val
=
312 (TYPE_TARGET_TYPE (type
),
313 unpack_pointer (lookup_pointer_type (builtin_type_void
),
314 valaddr
+ embedded_offset
));
315 common_val_print (deref_val
, stream
, format
, deref_ref
,
316 recurse
, pretty
, current_language
);
319 fputs_filtered ("???", stream
);
323 case TYPE_CODE_UNION
:
324 if (recurse
&& !unionprint
)
326 fprintf_filtered (stream
, "{...}");
330 case TYPE_CODE_STRUCT
:
331 /*FIXME: Abstract this away */
332 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
334 /* Print the unmangled name if desired. */
335 /* Print vtable entry - we only get here if NOT using
336 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
337 int offset
= (embedded_offset
+
338 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8);
339 struct type
*field_type
= TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
);
341 = extract_typed_address (valaddr
+ offset
, field_type
);
343 print_function_pointer_address (addr
, stream
);
346 cp_print_value_fields (type
, type
, valaddr
, embedded_offset
, address
, stream
, format
,
347 recurse
, pretty
, NULL
, 0);
353 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
356 len
= TYPE_NFIELDS (type
);
357 val
= unpack_long (type
, valaddr
+ embedded_offset
);
358 for (i
= 0; i
< len
; i
++)
361 if (val
== TYPE_FIELD_BITPOS (type
, i
))
368 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
372 print_longest (stream
, 'd', 0, val
);
376 case TYPE_CODE_FLAGS
:
378 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
380 val_print_type_code_flags (type
, valaddr
+ embedded_offset
, stream
);
384 case TYPE_CODE_METHOD
:
387 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
390 /* FIXME, we should consider, at least for ANSI C language, eliminating
391 the distinction made between FUNCs and POINTERs to FUNCs. */
392 fprintf_filtered (stream
, "{");
393 type_print (type
, "", stream
, -1);
394 fprintf_filtered (stream
, "} ");
395 /* Try to print what function it points to, and its address. */
396 print_address_demangle (address
, stream
, demangle
);
400 format
= format
? format
: output_format
;
402 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
405 val
= unpack_long (type
, valaddr
+ embedded_offset
);
407 fputs_filtered ("false", stream
);
409 fputs_filtered ("true", stream
);
411 print_longest (stream
, 'd', 0, val
);
415 case TYPE_CODE_RANGE
:
416 /* FIXME: create_range_type does not set the unsigned bit in a
417 range type (I think it probably should copy it from the target
418 type), so we won't print values which are too large to
419 fit in a signed integer correctly. */
420 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
421 print with the target type, though, because the size of our type
422 and the target type might differ). */
426 format
= format
? format
: output_format
;
429 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
433 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
434 /* C and C++ has no single byte int type, char is used instead.
435 Since we don't know whether the value is really intended to
436 be used as an integer or a character, print the character
437 equivalent as well. */
438 if (textual_element_type (type
, format
))
440 fputs_filtered (" ", stream
);
441 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
448 format
= format
? format
: output_format
;
451 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
455 val
= unpack_long (type
, valaddr
+ embedded_offset
);
456 if (TYPE_UNSIGNED (type
))
457 fprintf_filtered (stream
, "%u", (unsigned int) val
);
459 fprintf_filtered (stream
, "%d", (int) val
);
460 fputs_filtered (" ", stream
);
461 LA_PRINT_CHAR ((unsigned char) val
, stream
);
468 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
472 print_floating (valaddr
+ embedded_offset
, type
, stream
);
476 case TYPE_CODE_DECFLOAT
:
478 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
480 print_decimal_floating (valaddr
+ embedded_offset
, type
, stream
);
484 fprintf_filtered (stream
, "void");
487 case TYPE_CODE_ERROR
:
488 fprintf_filtered (stream
, _("<error type>"));
491 case TYPE_CODE_UNDEF
:
492 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
493 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
494 and no complete type for struct foo in that file. */
495 fprintf_filtered (stream
, _("<incomplete type>"));
498 case TYPE_CODE_COMPLEX
:
500 print_scalar_formatted (valaddr
+ embedded_offset
,
501 TYPE_TARGET_TYPE (type
),
504 print_floating (valaddr
+ embedded_offset
, TYPE_TARGET_TYPE (type
),
506 fprintf_filtered (stream
, " + ");
508 print_scalar_formatted (valaddr
+ embedded_offset
509 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
510 TYPE_TARGET_TYPE (type
),
513 print_floating (valaddr
+ embedded_offset
514 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
515 TYPE_TARGET_TYPE (type
),
517 fprintf_filtered (stream
, " * I");
521 error (_("Invalid C/C++ type code %d in symbol table."), TYPE_CODE (type
));
528 c_value_print (struct value
*val
, struct ui_file
*stream
, int format
,
529 enum val_prettyprint pretty
)
531 struct type
*type
, *real_type
;
532 int full
, top
, using_enc
;
534 /* If it is a pointer, indicate what it points to.
536 Print type also if it is a reference.
538 C++: if it is a member pointer, we will take care
539 of that when we print it. */
541 type
= check_typedef (value_type (val
));
543 if (TYPE_CODE (type
) == TYPE_CODE_PTR
544 || TYPE_CODE (type
) == TYPE_CODE_REF
)
546 /* Hack: remove (char *) for char strings. Their
547 type is indicated by the quoted string anyway.
548 (Don't use textual_element_type here; quoted strings
549 are always exactly (char *). */
550 if (TYPE_CODE (type
) == TYPE_CODE_PTR
551 && TYPE_NAME (type
) == NULL
552 && TYPE_NAME (TYPE_TARGET_TYPE (type
)) != NULL
553 && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type
)), "char") == 0)
557 else if (objectprint
&& (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
560 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
562 /* Copy value, change to pointer, so we don't get an
563 * error about a non-pointer type in value_rtti_target_type
565 struct value
*temparg
;
566 temparg
=value_copy(val
);
567 deprecated_set_value_type (temparg
, lookup_pointer_type (TYPE_TARGET_TYPE(type
)));
570 /* Pointer to class, check real type of object */
571 fprintf_filtered (stream
, "(");
572 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
575 /* RTTI entry found */
576 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
578 /* create a pointer type pointing to the real type */
579 type
= lookup_pointer_type (real_type
);
583 /* create a reference type referencing the real type */
584 type
= lookup_reference_type (real_type
);
586 /* JYG: Need to adjust pointer value. */
587 /* NOTE: cagney/2005-01-02: THIS IS BOGUS. */
588 value_contents_writeable (val
)[0] -= top
;
590 /* Note: When we look up RTTI entries, we don't get any
591 information on const or volatile attributes */
593 type_print (type
, "", stream
, -1);
594 fprintf_filtered (stream
, ") ");
599 fprintf_filtered (stream
, "(");
600 type_print (value_type (val
), "", stream
, -1);
601 fprintf_filtered (stream
, ") ");
605 if (!value_initialized (val
))
606 fprintf_filtered (stream
, " [uninitialized] ");
608 if (objectprint
&& (TYPE_CODE (type
) == TYPE_CODE_CLASS
))
610 /* Attempt to determine real type of object */
611 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
614 /* We have RTTI information, so use it */
615 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
616 fprintf_filtered (stream
, "(%s%s) ",
617 TYPE_NAME (real_type
),
618 full
? "" : _(" [incomplete object]"));
619 /* Print out object: enclosing type is same as real_type if full */
620 return val_print (value_enclosing_type (val
),
621 value_contents_all (val
), 0,
622 VALUE_ADDRESS (val
), stream
, format
, 1, 0,
623 pretty
, current_language
);
624 /* Note: When we look up RTTI entries, we don't get any information on
625 const or volatile attributes */
627 else if (type
!= check_typedef (value_enclosing_type (val
)))
629 /* No RTTI information, so let's do our best */
630 fprintf_filtered (stream
, "(%s ?) ",
631 TYPE_NAME (value_enclosing_type (val
)));
632 return val_print (value_enclosing_type (val
),
633 value_contents_all (val
), 0,
634 VALUE_ADDRESS (val
), stream
, format
, 1, 0,
635 pretty
, current_language
);
637 /* Otherwise, we end up at the return outside this "if" */
640 return val_print (type
, value_contents_all (val
),
641 value_embedded_offset (val
),
642 VALUE_ADDRESS (val
) + value_offset (val
),
643 stream
, format
, 1, 0, pretty
, current_language
);
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