1 /* Support for printing C values for GDB, the GNU debugger.
3 Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996,
4 1997, 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 #include "gdb_string.h"
27 #include "expression.h"
36 /* Print function pointer with inferior address ADDRESS onto stdio
40 print_function_pointer_address (CORE_ADDR address
, struct ui_file
*stream
)
42 CORE_ADDR func_addr
= gdbarch_convert_from_func_ptr_addr (current_gdbarch
,
46 /* If the function pointer is represented by a description, print the
47 address of the description. */
48 if (addressprint
&& func_addr
!= address
)
50 fputs_filtered ("@", stream
);
51 print_address_numeric (address
, 1, stream
);
52 fputs_filtered (": ", stream
);
54 print_address_demangle (func_addr
, stream
, demangle
);
58 /* Print data of type TYPE located at VALADDR (within GDB), which came from
59 the inferior at address ADDRESS, onto stdio stream STREAM according to
60 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
63 If the data are a string pointer, returns the number of string characters
66 If DEREF_REF is nonzero, then dereference references, otherwise just print
69 The PRETTY parameter controls prettyprinting. */
72 c_val_print (struct type
*type
, char *valaddr
, int embedded_offset
,
73 CORE_ADDR address
, struct ui_file
*stream
, int format
,
74 int deref_ref
, int recurse
, enum val_prettyprint pretty
)
76 unsigned int i
= 0; /* Number of characters printed */
84 switch (TYPE_CODE (type
))
87 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
88 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0)
90 eltlen
= TYPE_LENGTH (elttype
);
91 len
= TYPE_LENGTH (type
) / eltlen
;
92 if (prettyprint_arrays
)
94 print_spaces_filtered (2 + 2 * recurse
, stream
);
96 /* For an array of chars, print with string syntax. */
98 ((TYPE_CODE (elttype
) == TYPE_CODE_INT
)
99 || ((current_language
->la_language
== language_m2
)
100 && (TYPE_CODE (elttype
) == TYPE_CODE_CHAR
)))
101 && (format
== 0 || format
== 's'))
103 /* If requested, look for the first null char and only print
104 elements up to it. */
105 if (stop_print_at_null
)
107 unsigned int temp_len
;
109 /* Look for a NULL char. */
111 (valaddr
+ embedded_offset
)[temp_len
]
112 && temp_len
< len
&& temp_len
< print_max
;
117 LA_PRINT_STRING (stream
, valaddr
+ embedded_offset
, len
, eltlen
, 0);
122 fprintf_filtered (stream
, "{");
123 /* If this is a virtual function table, print the 0th
124 entry specially, and the rest of the members normally. */
125 if (cp_is_vtbl_ptr_type (elttype
))
128 fprintf_filtered (stream
, "%d vtable entries", len
- 1);
134 val_print_array_elements (type
, valaddr
+ embedded_offset
, address
, stream
,
135 format
, deref_ref
, recurse
, pretty
, i
);
136 fprintf_filtered (stream
, "}");
140 /* Array of unspecified length: treat like pointer to first elt. */
142 goto print_unpacked_pointer
;
145 if (format
&& format
!= 's')
147 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
150 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
152 /* Print the unmangled name if desired. */
153 /* Print vtable entry - we only get here if we ARE using
154 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
156 = extract_typed_address (valaddr
+ embedded_offset
, type
);
157 print_function_pointer_address (addr
, stream
);
160 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
161 if (TYPE_CODE (elttype
) == TYPE_CODE_METHOD
)
163 cp_print_class_method (valaddr
+ embedded_offset
, type
, stream
);
165 else if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
167 cp_print_class_member (valaddr
+ embedded_offset
,
168 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
173 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
174 print_unpacked_pointer
:
176 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
178 /* Try to print what function it points to. */
179 print_function_pointer_address (addr
, stream
);
180 /* Return value is irrelevant except for string pointers. */
184 if (addressprint
&& format
!= 's')
186 print_address_numeric (addr
, 1, stream
);
189 /* For a pointer to char or unsigned char, also print the string
190 pointed to, unless pointer is null. */
191 /* FIXME: need to handle wchar_t here... */
193 if (TYPE_LENGTH (elttype
) == 1
194 && TYPE_CODE (elttype
) == TYPE_CODE_INT
195 && (format
== 0 || format
== 's')
198 i
= val_print_string (addr
, -1, TYPE_LENGTH (elttype
), stream
);
200 else if (cp_is_vtbl_member (type
))
202 /* print vtbl's nicely */
203 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
205 struct minimal_symbol
*msymbol
=
206 lookup_minimal_symbol_by_pc (vt_address
);
207 if ((msymbol
!= NULL
) &&
208 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
210 fputs_filtered (" <", stream
);
211 fputs_filtered (SYMBOL_PRINT_NAME (msymbol
), stream
);
212 fputs_filtered (">", stream
);
214 if (vt_address
&& vtblprint
)
216 struct value
*vt_val
;
217 struct symbol
*wsym
= (struct symbol
*) NULL
;
219 struct block
*block
= (struct block
*) NULL
;
223 wsym
= lookup_symbol (DEPRECATED_SYMBOL_NAME (msymbol
), block
,
224 VAR_DOMAIN
, &is_this_fld
, NULL
);
228 wtype
= SYMBOL_TYPE (wsym
);
232 wtype
= TYPE_TARGET_TYPE (type
);
234 vt_val
= value_at (wtype
, vt_address
, NULL
);
235 val_print (VALUE_TYPE (vt_val
), VALUE_CONTENTS (vt_val
), 0,
236 VALUE_ADDRESS (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 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
),
286 val_print (VALUE_TYPE (deref_val
),
287 VALUE_CONTENTS (deref_val
),
289 VALUE_ADDRESS (deref_val
),
297 fputs_filtered ("???", stream
);
301 case TYPE_CODE_UNION
:
302 if (recurse
&& !unionprint
)
304 fprintf_filtered (stream
, "{...}");
308 case TYPE_CODE_STRUCT
:
309 /*FIXME: Abstract this away */
310 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
312 /* Print the unmangled name if desired. */
313 /* Print vtable entry - we only get here if NOT using
314 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
315 int offset
= (embedded_offset
+
316 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8);
317 struct type
*field_type
= TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
);
319 = extract_typed_address (valaddr
+ offset
, field_type
);
321 print_function_pointer_address (addr
, stream
);
324 cp_print_value_fields (type
, type
, valaddr
, embedded_offset
, address
, stream
, format
,
325 recurse
, pretty
, NULL
, 0);
331 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
334 len
= TYPE_NFIELDS (type
);
335 val
= unpack_long (type
, valaddr
+ embedded_offset
);
336 for (i
= 0; i
< len
; i
++)
339 if (val
== TYPE_FIELD_BITPOS (type
, i
))
346 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
350 print_longest (stream
, 'd', 0, val
);
357 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
360 /* FIXME, we should consider, at least for ANSI C language, eliminating
361 the distinction made between FUNCs and POINTERs to FUNCs. */
362 fprintf_filtered (stream
, "{");
363 type_print (type
, "", stream
, -1);
364 fprintf_filtered (stream
, "} ");
365 /* Try to print what function it points to, and its address. */
366 print_address_demangle (address
, stream
, demangle
);
370 format
= format
? format
: output_format
;
372 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
375 val
= unpack_long (type
, valaddr
+ embedded_offset
);
377 fputs_filtered ("false", stream
);
379 fputs_filtered ("true", stream
);
381 print_longest (stream
, 'd', 0, val
);
385 case TYPE_CODE_RANGE
:
386 /* FIXME: create_range_type does not set the unsigned bit in a
387 range type (I think it probably should copy it from the target
388 type), so we won't print values which are too large to
389 fit in a signed integer correctly. */
390 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
391 print with the target type, though, because the size of our type
392 and the target type might differ). */
396 format
= format
? format
: output_format
;
399 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
403 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
404 /* C and C++ has no single byte int type, char is used instead.
405 Since we don't know whether the value is really intended to
406 be used as an integer or a character, print the character
407 equivalent as well. */
408 if (TYPE_LENGTH (type
) == 1)
410 fputs_filtered (" ", stream
);
411 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
418 format
= format
? format
: output_format
;
421 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
425 val
= unpack_long (type
, valaddr
+ embedded_offset
);
426 if (TYPE_UNSIGNED (type
))
427 fprintf_filtered (stream
, "%u", (unsigned int) val
);
429 fprintf_filtered (stream
, "%d", (int) val
);
430 fputs_filtered (" ", stream
);
431 LA_PRINT_CHAR ((unsigned char) val
, stream
);
438 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
442 print_floating (valaddr
+ embedded_offset
, type
, stream
);
446 case TYPE_CODE_METHOD
:
448 struct value
*v
= value_at (type
, address
, NULL
);
449 cp_print_class_method (VALUE_CONTENTS (value_addr (v
)),
450 lookup_pointer_type (type
), stream
);
455 fprintf_filtered (stream
, "void");
458 case TYPE_CODE_ERROR
:
459 fprintf_filtered (stream
, "<error type>");
462 case TYPE_CODE_UNDEF
:
463 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
464 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
465 and no complete type for struct foo in that file. */
466 fprintf_filtered (stream
, "<incomplete type>");
469 case TYPE_CODE_COMPLEX
:
471 print_scalar_formatted (valaddr
+ embedded_offset
,
472 TYPE_TARGET_TYPE (type
),
475 print_floating (valaddr
+ embedded_offset
, TYPE_TARGET_TYPE (type
),
477 fprintf_filtered (stream
, " + ");
479 print_scalar_formatted (valaddr
+ embedded_offset
480 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
481 TYPE_TARGET_TYPE (type
),
484 print_floating (valaddr
+ embedded_offset
485 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
486 TYPE_TARGET_TYPE (type
),
488 fprintf_filtered (stream
, " * I");
492 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type
));
499 c_value_print (struct value
*val
, struct ui_file
*stream
, int format
,
500 enum val_prettyprint pretty
)
502 struct type
*type
= VALUE_TYPE (val
);
503 struct type
*real_type
;
504 int full
, top
, using_enc
;
506 /* If it is a pointer, indicate what it points to.
508 Print type also if it is a reference.
510 C++: if it is a member pointer, we will take care
511 of that when we print it. */
512 if (TYPE_CODE (type
) == TYPE_CODE_PTR
||
513 TYPE_CODE (type
) == TYPE_CODE_REF
)
515 /* Hack: remove (char *) for char strings. Their
516 type is indicated by the quoted string anyway. */
517 if (TYPE_CODE (type
) == TYPE_CODE_PTR
&&
518 TYPE_NAME (type
) == NULL
&&
519 TYPE_NAME (TYPE_TARGET_TYPE (type
)) != NULL
&&
520 strcmp (TYPE_NAME (TYPE_TARGET_TYPE (type
)), "char") == 0)
524 else if (objectprint
&& (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
527 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
529 /* Copy value, change to pointer, so we don't get an
530 * error about a non-pointer type in value_rtti_target_type
532 struct value
*temparg
;
533 temparg
=value_copy(val
);
534 VALUE_TYPE (temparg
) = lookup_pointer_type(TYPE_TARGET_TYPE(type
));
537 /* Pointer to class, check real type of object */
538 fprintf_filtered (stream
, "(");
539 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
542 /* RTTI entry found */
543 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
545 /* create a pointer type pointing to the real type */
546 type
= lookup_pointer_type (real_type
);
550 /* create a reference type referencing the real type */
551 type
= lookup_reference_type (real_type
);
553 /* JYG: Need to adjust pointer value. */
554 val
->aligner
.contents
[0] -= top
;
556 /* Note: When we look up RTTI entries, we don't get any
557 information on const or volatile attributes */
559 type_print (type
, "", stream
, -1);
560 fprintf_filtered (stream
, ") ");
565 fprintf_filtered (stream
, "(");
566 type_print (type
, "", stream
, -1);
567 fprintf_filtered (stream
, ") ");
570 if (objectprint
&& (TYPE_CODE (VALUE_TYPE (val
)) == TYPE_CODE_CLASS
))
572 /* Attempt to determine real type of object */
573 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
576 /* We have RTTI information, so use it */
577 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
578 fprintf_filtered (stream
, "(%s%s) ",
579 TYPE_NAME (real_type
),
580 full
? "" : " [incomplete object]");
581 /* Print out object: enclosing type is same as real_type if full */
582 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
583 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
584 /* Note: When we look up RTTI entries, we don't get any information on
585 const or volatile attributes */
587 else if (type
!= VALUE_ENCLOSING_TYPE (val
))
589 /* No RTTI information, so let's do our best */
590 fprintf_filtered (stream
, "(%s ?) ",
591 TYPE_NAME (VALUE_ENCLOSING_TYPE (val
)));
592 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
593 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
595 /* Otherwise, we end up at the return outside this "if" */
598 return val_print (type
, VALUE_CONTENTS_ALL (val
),
599 VALUE_EMBEDDED_OFFSET (val
),
600 VALUE_ADDRESS (val
) + VALUE_OFFSET (val
),
601 stream
, format
, 1, 0, pretty
);
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