1 /* Support for printing C values for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24 #include "expression.h"
32 /* Print data of type TYPE located at VALADDR (within GDB), which came from
33 the inferior at address ADDRESS, onto stdio stream STREAM according to
34 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
37 If the data are a string pointer, returns the number of string characters
40 If DEREF_REF is nonzero, then dereference references, otherwise just print
43 The PRETTY parameter controls prettyprinting. */
46 c_val_print (type
, valaddr
, embedded_offset
, address
, stream
, format
, deref_ref
, recurse
,
56 enum val_prettyprint pretty
;
58 register unsigned int i
= 0; /* Number of characters printed */
66 switch (TYPE_CODE (type
))
69 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
70 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0)
72 eltlen
= TYPE_LENGTH (elttype
);
73 len
= TYPE_LENGTH (type
) / eltlen
;
74 if (prettyprint_arrays
)
76 print_spaces_filtered (2 + 2 * recurse
, stream
);
78 /* For an array of chars, print with string syntax. */
80 ((TYPE_CODE (elttype
) == TYPE_CODE_INT
)
81 || ((current_language
->la_language
== language_m2
)
82 && (TYPE_CODE (elttype
) == TYPE_CODE_CHAR
)))
83 && (format
== 0 || format
== 's'))
85 /* If requested, look for the first null char and only print
87 if (stop_print_at_null
)
91 /* Look for a NULL char. */
93 (valaddr
+ embedded_offset
)[temp_len
]
94 && temp_len
< len
&& temp_len
< print_max
;
99 LA_PRINT_STRING (stream
, valaddr
+ embedded_offset
, len
, eltlen
, 0);
104 fprintf_filtered (stream
, "{");
105 /* If this is a virtual function table, print the 0th
106 entry specially, and the rest of the members normally. */
107 if (cp_is_vtbl_ptr_type (elttype
))
110 fprintf_filtered (stream
, "%d vtable entries", len
- 1);
116 val_print_array_elements (type
, valaddr
+ embedded_offset
, address
, stream
,
117 format
, deref_ref
, recurse
, pretty
, i
);
118 fprintf_filtered (stream
, "}");
122 /* Array of unspecified length: treat like pointer to first elt. */
124 goto print_unpacked_pointer
;
127 if (format
&& format
!= 's')
129 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
132 if (vtblprint
&& cp_is_vtbl_ptr_type(type
))
134 /* Print the unmangled name if desired. */
135 /* Print vtable entry - we only get here if we ARE using
136 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
137 print_address_demangle(extract_address (valaddr
+ embedded_offset
, TYPE_LENGTH (type
)),
141 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
142 if (TYPE_CODE (elttype
) == TYPE_CODE_METHOD
)
144 cp_print_class_method (valaddr
+ embedded_offset
, type
, stream
);
146 else if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
148 cp_print_class_member (valaddr
+ embedded_offset
,
149 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
154 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
155 print_unpacked_pointer
:
156 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
158 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
160 /* Try to print what function it points to. */
161 print_address_demangle (addr
, stream
, demangle
);
162 /* Return value is irrelevant except for string pointers. */
166 if (addressprint
&& format
!= 's')
168 print_address_numeric (addr
, 1, stream
);
171 /* For a pointer to char or unsigned char, also print the string
172 pointed to, unless pointer is null. */
173 /* FIXME: need to handle wchar_t here... */
175 if (TYPE_LENGTH (elttype
) == 1
176 && TYPE_CODE (elttype
) == TYPE_CODE_INT
177 && (format
== 0 || format
== 's')
180 i
= val_print_string (addr
, -1, TYPE_LENGTH (elttype
), stream
);
182 else if (cp_is_vtbl_member(type
))
184 /* print vtbl's nicely */
185 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
187 struct minimal_symbol
*msymbol
=
188 lookup_minimal_symbol_by_pc (vt_address
);
189 if ((msymbol
!= NULL
) &&
190 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
192 fputs_filtered (" <", stream
);
193 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol
), stream
);
194 fputs_filtered (">", stream
);
196 if (vt_address
&& vtblprint
)
199 struct symbol
*wsym
= (struct symbol
*)NULL
;
202 struct block
*block
= (struct block
*)NULL
;
206 wsym
= lookup_symbol (SYMBOL_NAME(msymbol
), block
,
207 VAR_NAMESPACE
, &is_this_fld
, &s
);
211 wtype
= SYMBOL_TYPE(wsym
);
215 wtype
= TYPE_TARGET_TYPE(type
);
217 vt_val
= value_at (wtype
, vt_address
, NULL
);
218 val_print (VALUE_TYPE (vt_val
), VALUE_CONTENTS (vt_val
), 0,
219 VALUE_ADDRESS (vt_val
), stream
, format
,
220 deref_ref
, recurse
+ 1, pretty
);
223 fprintf_filtered (stream
, "\n");
224 print_spaces_filtered (2 + 2 * recurse
, stream
);
229 /* Return number of characters printed, including the terminating
230 '\0' if we reached the end. val_print_string takes care including
231 the terminating '\0' if necessary. */
236 case TYPE_CODE_MEMBER
:
237 error ("not implemented: member type in c_val_print");
241 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
242 if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
244 cp_print_class_member (valaddr
+ embedded_offset
,
245 TYPE_DOMAIN_TYPE (elttype
),
251 fprintf_filtered (stream
, "@");
252 print_address_numeric
253 (extract_address (valaddr
+ embedded_offset
,
254 TARGET_PTR_BIT
/ HOST_CHAR_BIT
), 1, stream
);
256 fputs_filtered (": ", stream
);
258 /* De-reference the reference. */
261 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
263 value_ptr deref_val
=
265 (TYPE_TARGET_TYPE (type
),
266 unpack_pointer (lookup_pointer_type (builtin_type_void
),
267 valaddr
+ embedded_offset
),
269 val_print (VALUE_TYPE (deref_val
),
270 VALUE_CONTENTS (deref_val
),
272 VALUE_ADDRESS (deref_val
),
280 fputs_filtered ("???", stream
);
284 case TYPE_CODE_UNION
:
285 if (recurse
&& !unionprint
)
287 fprintf_filtered (stream
, "{...}");
291 case TYPE_CODE_STRUCT
:
292 if (vtblprint
&& cp_is_vtbl_ptr_type(type
))
294 /* Print the unmangled name if desired. */
295 /* Print vtable entry - we only get here if NOT using
296 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
297 print_address_demangle (extract_address (
298 valaddr
+ embedded_offset
+
299 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8,
300 TYPE_LENGTH (TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
))),
304 cp_print_value_fields (type
, type
, valaddr
, embedded_offset
, address
, stream
, format
,
305 recurse
, pretty
, NULL
, 0);
311 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
314 len
= TYPE_NFIELDS (type
);
315 val
= unpack_long (type
, valaddr
+ embedded_offset
);
316 for (i
= 0; i
< len
; i
++)
319 if (val
== TYPE_FIELD_BITPOS (type
, i
))
326 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
330 print_longest (stream
, 'd', 0, val
);
337 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
340 /* FIXME, we should consider, at least for ANSI C language, eliminating
341 the distinction made between FUNCs and POINTERs to FUNCs. */
342 fprintf_filtered (stream
, "{");
343 type_print (type
, "", stream
, -1);
344 fprintf_filtered (stream
, "} ");
345 /* Try to print what function it points to, and its address. */
346 print_address_demangle (address
, stream
, demangle
);
350 format
= format
? format
: output_format
;
352 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
355 val
= unpack_long (type
, valaddr
+ embedded_offset
);
357 fputs_filtered ("false", stream
);
359 fputs_filtered ("true", stream
);
361 print_longest (stream
, 'd', 0, val
);
365 case TYPE_CODE_RANGE
:
366 /* FIXME: create_range_type does not set the unsigned bit in a
367 range type (I think it probably should copy it from the target
368 type), so we won't print values which are too large to
369 fit in a signed integer correctly. */
370 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
371 print with the target type, though, because the size of our type
372 and the target type might differ). */
376 format
= format
? format
: output_format
;
379 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
383 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
384 /* C and C++ has no single byte int type, char is used instead.
385 Since we don't know whether the value is really intended to
386 be used as an integer or a character, print the character
387 equivalent as well. */
388 if (TYPE_LENGTH (type
) == 1)
390 fputs_filtered (" ", stream
);
391 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
398 format
= format
? format
: output_format
;
401 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
405 fprintf_filtered (stream
, TYPE_UNSIGNED (type
) ? "%u" : "%d",
406 unpack_long (type
, valaddr
+ embedded_offset
));
407 fputs_filtered (" ", stream
);
408 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
), stream
);
415 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
419 print_floating (valaddr
+ embedded_offset
, type
, stream
);
423 case TYPE_CODE_METHOD
:
424 cp_print_class_method (valaddr
+ embedded_offset
, lookup_pointer_type (type
), stream
);
428 fprintf_filtered (stream
, "void");
431 case TYPE_CODE_ERROR
:
432 fprintf_filtered (stream
, "<error type>");
435 case TYPE_CODE_UNDEF
:
436 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
437 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
438 and no complete type for struct foo in that file. */
439 fprintf_filtered (stream
, "<incomplete type>");
443 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type
));
450 c_value_print (val
, stream
, format
, pretty
)
454 enum val_prettyprint pretty
;
456 struct type
*type
= VALUE_TYPE (val
);
457 struct type
* real_type
;
458 int full
, top
, using_enc
;
460 /* If it is a pointer, indicate what it points to.
462 Print type also if it is a reference.
464 C++: if it is a member pointer, we will take care
465 of that when we print it. */
466 if (TYPE_CODE (type
) == TYPE_CODE_PTR
||
467 TYPE_CODE (type
) == TYPE_CODE_REF
)
469 /* Hack: remove (char *) for char strings. Their
470 type is indicated by the quoted string anyway. */
471 /* Hack^2: ensure that const char *, const unsigned char *
472 come out without the type but the volatile variants
473 and the signed variants don't. */
474 if (TYPE_CODE (type
) == TYPE_CODE_PTR
&&
475 TYPE_NAME (type
) == NULL
&&
476 TYPE_NAME (TYPE_TARGET_TYPE (type
)) != NULL
&&
477 STREQ (TYPE_NAME (TYPE_TARGET_TYPE (type
)), "char"))
481 else if (objectprint
&& (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
483 /* Pointer to class, check real type of object */
484 fprintf_filtered (stream
, "(");
485 type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
488 /* RTTI entry found */
489 type
= lookup_pointer_type (type
);
490 type_print (type
, "", stream
, -1);
494 /* No RTTI fields, do whatever we can */
495 type
= VALUE_ENCLOSING_TYPE (val
);
496 type_print (type
, "", stream
, -1);
497 fprintf_filtered (stream
, " ?");
499 fprintf_filtered (stream
, ") ");
504 fprintf_filtered (stream
, "(");
505 type_print (type
, "", stream
, -1);
506 fprintf_filtered (stream
, ") ");
509 if (objectprint
&& (TYPE_CODE (VALUE_TYPE (val
)) == TYPE_CODE_CLASS
))
511 /* Attempt to determine real type of object */
512 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
515 /* We have RTTI information, so use it */
516 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
517 fprintf_filtered (stream
, "(%s%s) ",
518 TYPE_NAME (real_type
),
519 full
? "" : " [incomplete object]");
520 /* Print out object: enclosing type is same as real_type if full */
521 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
522 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
524 else if (type
!= VALUE_ENCLOSING_TYPE (val
))
526 /* No RTTI information, so let's do our best */
527 fprintf_filtered (stream
, "(%s ?) ",
528 TYPE_NAME (VALUE_ENCLOSING_TYPE (val
)));
529 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
530 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
532 /* Otherwise, we end up at the return outside this "if" */
535 return val_print (type
, VALUE_CONTENTS_ALL (val
), VALUE_EMBEDDED_OFFSET (val
),
537 stream
, format
, 1, 0, pretty
);
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