1 /* Support for printing C values for GDB, the GNU debugger.
3 Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996,
4 1997, 1998, 1999, 2000, 2001, 2003, 2005, 2006
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 2 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, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
25 #include "gdb_string.h"
28 #include "expression.h"
37 /* Print function pointer with inferior address ADDRESS onto stdio
41 print_function_pointer_address (CORE_ADDR address
, struct ui_file
*stream
)
43 CORE_ADDR func_addr
= gdbarch_convert_from_func_ptr_addr (current_gdbarch
,
47 /* If the function pointer is represented by a description, print the
48 address of the description. */
49 if (addressprint
&& func_addr
!= address
)
51 fputs_filtered ("@", stream
);
52 deprecated_print_address_numeric (address
, 1, stream
);
53 fputs_filtered (": ", stream
);
55 print_address_demangle (func_addr
, stream
, demangle
);
59 /* Print data of type TYPE located at VALADDR (within GDB), which came from
60 the inferior at address ADDRESS, onto stdio stream STREAM according to
61 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
64 If the data are a string pointer, returns the number of string characters
67 If DEREF_REF is nonzero, then dereference references, otherwise just print
70 The PRETTY parameter controls prettyprinting. */
73 c_val_print (struct type
*type
, const gdb_byte
*valaddr
, int embedded_offset
,
74 CORE_ADDR address
, struct ui_file
*stream
, int format
,
75 int deref_ref
, int recurse
, enum val_prettyprint pretty
)
77 unsigned int i
= 0; /* Number of characters printed */
85 switch (TYPE_CODE (type
))
88 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
89 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0)
91 eltlen
= TYPE_LENGTH (elttype
);
92 len
= TYPE_LENGTH (type
) / eltlen
;
93 if (prettyprint_arrays
)
95 print_spaces_filtered (2 + 2 * recurse
, stream
);
97 /* For an array of chars, print with string syntax. */
99 ((TYPE_CODE (elttype
) == TYPE_CODE_INT
)
100 || ((current_language
->la_language
== language_m2
)
101 && (TYPE_CODE (elttype
) == TYPE_CODE_CHAR
)))
102 && (format
== 0 || format
== 's'))
104 /* If requested, look for the first null char and only print
105 elements up to it. */
106 if (stop_print_at_null
)
108 unsigned int temp_len
;
110 /* Look for a NULL char. */
112 (valaddr
+ embedded_offset
)[temp_len
]
113 && temp_len
< len
&& temp_len
< print_max
;
118 LA_PRINT_STRING (stream
, valaddr
+ embedded_offset
, len
, eltlen
, 0);
123 fprintf_filtered (stream
, "{");
124 /* If this is a virtual function table, print the 0th
125 entry specially, and the rest of the members normally. */
126 if (cp_is_vtbl_ptr_type (elttype
))
129 fprintf_filtered (stream
, _("%d vtable entries"), len
- 1);
135 val_print_array_elements (type
, valaddr
+ embedded_offset
, address
, stream
,
136 format
, deref_ref
, recurse
, pretty
, i
);
137 fprintf_filtered (stream
, "}");
141 /* Array of unspecified length: treat like pointer to first elt. */
143 goto print_unpacked_pointer
;
146 if (format
&& format
!= 's')
148 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
151 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
153 /* Print the unmangled name if desired. */
154 /* Print vtable entry - we only get here if we ARE using
155 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
157 = extract_typed_address (valaddr
+ embedded_offset
, type
);
158 print_function_pointer_address (addr
, stream
);
161 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
162 if (TYPE_CODE (elttype
) == TYPE_CODE_METHOD
)
164 cp_print_class_method (valaddr
+ embedded_offset
, type
, stream
);
166 else if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
168 cp_print_class_member (valaddr
+ embedded_offset
,
169 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
174 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
175 print_unpacked_pointer
:
177 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
179 /* Try to print what function it points to. */
180 print_function_pointer_address (addr
, stream
);
181 /* Return value is irrelevant except for string pointers. */
185 if (addressprint
&& format
!= 's')
187 deprecated_print_address_numeric (addr
, 1, stream
);
190 /* For a pointer to char or unsigned char, also print the string
191 pointed to, unless pointer is null. */
192 /* FIXME: need to handle wchar_t here... */
194 if (TYPE_LENGTH (elttype
) == 1
195 && TYPE_CODE (elttype
) == TYPE_CODE_INT
196 && (format
== 0 || format
== 's')
199 i
= val_print_string (addr
, -1, TYPE_LENGTH (elttype
), stream
);
201 else if (cp_is_vtbl_member (type
))
203 /* print vtbl's nicely */
204 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
206 struct minimal_symbol
*msymbol
=
207 lookup_minimal_symbol_by_pc (vt_address
);
208 if ((msymbol
!= NULL
) &&
209 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
211 fputs_filtered (" <", stream
);
212 fputs_filtered (SYMBOL_PRINT_NAME (msymbol
), stream
);
213 fputs_filtered (">", stream
);
215 if (vt_address
&& vtblprint
)
217 struct value
*vt_val
;
218 struct symbol
*wsym
= (struct symbol
*) NULL
;
220 struct block
*block
= (struct block
*) NULL
;
224 wsym
= lookup_symbol (DEPRECATED_SYMBOL_NAME (msymbol
), block
,
225 VAR_DOMAIN
, &is_this_fld
, NULL
);
229 wtype
= SYMBOL_TYPE (wsym
);
233 wtype
= TYPE_TARGET_TYPE (type
);
235 vt_val
= value_at (wtype
, vt_address
);
236 common_val_print (vt_val
, stream
, format
,
237 deref_ref
, recurse
+ 1, pretty
);
240 fprintf_filtered (stream
, "\n");
241 print_spaces_filtered (2 + 2 * recurse
, stream
);
246 /* Return number of characters printed, including the terminating
247 '\0' if we reached the end. val_print_string takes care including
248 the terminating '\0' if necessary. */
253 case TYPE_CODE_MEMBER
:
254 error (_("not implemented: member type in c_val_print"));
258 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
259 if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
261 cp_print_class_member (valaddr
+ embedded_offset
,
262 TYPE_DOMAIN_TYPE (elttype
),
269 = extract_typed_address (valaddr
+ embedded_offset
, type
);
270 fprintf_filtered (stream
, "@");
271 deprecated_print_address_numeric (addr
, 1, stream
);
273 fputs_filtered (": ", stream
);
275 /* De-reference the reference. */
278 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
280 struct value
*deref_val
=
282 (TYPE_TARGET_TYPE (type
),
283 unpack_pointer (lookup_pointer_type (builtin_type_void
),
284 valaddr
+ embedded_offset
));
285 common_val_print (deref_val
, stream
, format
, deref_ref
,
289 fputs_filtered ("???", stream
);
293 case TYPE_CODE_UNION
:
294 if (recurse
&& !unionprint
)
296 fprintf_filtered (stream
, "{...}");
300 case TYPE_CODE_STRUCT
:
301 /*FIXME: Abstract this away */
302 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
304 /* Print the unmangled name if desired. */
305 /* Print vtable entry - we only get here if NOT using
306 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
307 int offset
= (embedded_offset
+
308 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8);
309 struct type
*field_type
= TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
);
311 = extract_typed_address (valaddr
+ offset
, field_type
);
313 print_function_pointer_address (addr
, stream
);
316 cp_print_value_fields (type
, type
, valaddr
, embedded_offset
, address
, stream
, format
,
317 recurse
, pretty
, NULL
, 0);
323 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
326 len
= TYPE_NFIELDS (type
);
327 val
= unpack_long (type
, valaddr
+ embedded_offset
);
328 for (i
= 0; i
< len
; i
++)
331 if (val
== TYPE_FIELD_BITPOS (type
, i
))
338 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
342 print_longest (stream
, 'd', 0, val
);
346 case TYPE_CODE_FLAGS
:
348 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
350 val_print_type_code_flags (type
, valaddr
+ embedded_offset
, stream
);
356 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
359 /* FIXME, we should consider, at least for ANSI C language, eliminating
360 the distinction made between FUNCs and POINTERs to FUNCs. */
361 fprintf_filtered (stream
, "{");
362 type_print (type
, "", stream
, -1);
363 fprintf_filtered (stream
, "} ");
364 /* Try to print what function it points to, and its address. */
365 print_address_demangle (address
, stream
, demangle
);
369 format
= format
? format
: output_format
;
371 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
374 val
= unpack_long (type
, valaddr
+ embedded_offset
);
376 fputs_filtered ("false", stream
);
378 fputs_filtered ("true", stream
);
380 print_longest (stream
, 'd', 0, val
);
384 case TYPE_CODE_RANGE
:
385 /* FIXME: create_range_type does not set the unsigned bit in a
386 range type (I think it probably should copy it from the target
387 type), so we won't print values which are too large to
388 fit in a signed integer correctly. */
389 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
390 print with the target type, though, because the size of our type
391 and the target type might differ). */
395 format
= format
? format
: output_format
;
398 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
402 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
403 /* C and C++ has no single byte int type, char is used instead.
404 Since we don't know whether the value is really intended to
405 be used as an integer or a character, print the character
406 equivalent as well. */
407 if (TYPE_LENGTH (type
) == 1)
409 fputs_filtered (" ", stream
);
410 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
417 format
= format
? format
: output_format
;
420 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
424 val
= unpack_long (type
, valaddr
+ embedded_offset
);
425 if (TYPE_UNSIGNED (type
))
426 fprintf_filtered (stream
, "%u", (unsigned int) val
);
428 fprintf_filtered (stream
, "%d", (int) val
);
429 fputs_filtered (" ", stream
);
430 LA_PRINT_CHAR ((unsigned char) val
, stream
);
437 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
441 print_floating (valaddr
+ embedded_offset
, type
, stream
);
445 case TYPE_CODE_METHOD
:
447 struct value
*v
= value_at (type
, address
);
448 cp_print_class_method (value_contents (value_addr (v
)),
449 lookup_pointer_type (type
), stream
);
454 fprintf_filtered (stream
, "void");
457 case TYPE_CODE_ERROR
:
458 fprintf_filtered (stream
, _("<error type>"));
461 case TYPE_CODE_UNDEF
:
462 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
463 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
464 and no complete type for struct foo in that file. */
465 fprintf_filtered (stream
, _("<incomplete type>"));
468 case TYPE_CODE_COMPLEX
:
470 print_scalar_formatted (valaddr
+ embedded_offset
,
471 TYPE_TARGET_TYPE (type
),
474 print_floating (valaddr
+ embedded_offset
, TYPE_TARGET_TYPE (type
),
476 fprintf_filtered (stream
, " + ");
478 print_scalar_formatted (valaddr
+ embedded_offset
479 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
480 TYPE_TARGET_TYPE (type
),
483 print_floating (valaddr
+ embedded_offset
484 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
485 TYPE_TARGET_TYPE (type
),
487 fprintf_filtered (stream
, " * I");
491 error (_("Invalid C/C++ type code %d in symbol table."), TYPE_CODE (type
));
498 c_value_print (struct value
*val
, struct ui_file
*stream
, int format
,
499 enum val_prettyprint pretty
)
501 struct type
*type
, *real_type
;
502 int full
, top
, using_enc
;
504 /* If it is a pointer, indicate what it points to.
506 Print type also if it is a reference.
508 C++: if it is a member pointer, we will take care
509 of that when we print it. */
511 type
= check_typedef (value_type (val
));
513 if (TYPE_CODE (type
) == TYPE_CODE_PTR
514 || TYPE_CODE (type
) == TYPE_CODE_REF
)
516 /* Hack: remove (char *) for char strings. Their
517 type is indicated by the quoted string anyway. */
518 if (TYPE_CODE (type
) == TYPE_CODE_PTR
519 && TYPE_NAME (type
) == NULL
520 && TYPE_NAME (TYPE_TARGET_TYPE (type
)) != NULL
521 && strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type
)), "char") == 0)
525 else if (objectprint
&& (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
528 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
530 /* Copy value, change to pointer, so we don't get an
531 * error about a non-pointer type in value_rtti_target_type
533 struct value
*temparg
;
534 temparg
=value_copy(val
);
535 deprecated_set_value_type (temparg
, lookup_pointer_type (TYPE_TARGET_TYPE(type
)));
538 /* Pointer to class, check real type of object */
539 fprintf_filtered (stream
, "(");
540 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
543 /* RTTI entry found */
544 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
546 /* create a pointer type pointing to the real type */
547 type
= lookup_pointer_type (real_type
);
551 /* create a reference type referencing the real type */
552 type
= lookup_reference_type (real_type
);
554 /* JYG: Need to adjust pointer value. */
555 /* NOTE: cagney/2005-01-02: THIS IS BOGUS. */
556 value_contents_writeable (val
)[0] -= top
;
558 /* Note: When we look up RTTI entries, we don't get any
559 information on const or volatile attributes */
561 type_print (type
, "", stream
, -1);
562 fprintf_filtered (stream
, ") ");
567 fprintf_filtered (stream
, "(");
568 type_print (value_type (val
), "", stream
, -1);
569 fprintf_filtered (stream
, ") ");
573 if (objectprint
&& (TYPE_CODE (type
) == TYPE_CODE_CLASS
))
575 /* Attempt to determine real type of object */
576 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
579 /* We have RTTI information, so use it */
580 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
581 fprintf_filtered (stream
, "(%s%s) ",
582 TYPE_NAME (real_type
),
583 full
? "" : _(" [incomplete object]"));
584 /* Print out object: enclosing type is same as real_type if full */
585 return val_print (value_enclosing_type (val
),
586 value_contents_all (val
), 0,
587 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
588 /* Note: When we look up RTTI entries, we don't get any information on
589 const or volatile attributes */
591 else if (type
!= check_typedef (value_enclosing_type (val
)))
593 /* No RTTI information, so let's do our best */
594 fprintf_filtered (stream
, "(%s ?) ",
595 TYPE_NAME (value_enclosing_type (val
)));
596 return val_print (value_enclosing_type (val
),
597 value_contents_all (val
), 0,
598 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
600 /* Otherwise, we end up at the return outside this "if" */
603 return val_print (type
, value_contents_all (val
),
604 value_embedded_offset (val
),
605 VALUE_ADDRESS (val
) + value_offset (val
),
606 stream
, format
, 1, 0, pretty
);
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