1 /* Support for printing C values for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 #include "expression.h"
32 extern int vtblprint
; /* Controls printing of vtbl's */
35 cp_print_class_member
PARAMS ((char *, struct type
*, GDB_FILE
*, char *));
38 cp_print_class_method
PARAMS ((char *, struct type
*, GDB_FILE
*));
41 cp_print_value_fields
PARAMS ((struct type
*, char *, GDB_FILE
*, int, int,
42 enum val_prettyprint
, struct type
**));
45 cp_is_vtbl_ptr_type
PARAMS ((struct type
*));
48 cp_is_vtbl_member
PARAMS ((struct type
*));
53 /* BEGIN-FIXME: Hooks into c-typeprint.c */
56 c_type_print_varspec_prefix
PARAMS ((struct type
*, GDB_FILE
*, int, int));
59 cp_type_print_method_args
PARAMS ((struct type
**, char *, char *, int,
64 extern struct obstack dont_print_obstack
;
67 /* Print data of type TYPE located at VALADDR (within GDB), which came from
68 the inferior at address ADDRESS, onto stdio stream STREAM according to
69 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
72 If the data are a string pointer, returns the number of string characters
75 If DEREF_REF is nonzero, then dereference references, otherwise just print
78 The PRETTY parameter controls prettyprinting. */
81 c_val_print (type
, valaddr
, address
, stream
, format
, deref_ref
, recurse
,
90 enum val_prettyprint pretty
;
92 register unsigned int i
= 0; /* Number of characters printed */
99 switch (TYPE_CODE (type
))
101 case TYPE_CODE_ARRAY
:
102 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0)
104 elttype
= TYPE_TARGET_TYPE (type
);
105 eltlen
= TYPE_LENGTH (elttype
);
106 len
= TYPE_LENGTH (type
) / eltlen
;
107 if (prettyprint_arrays
)
109 print_spaces_filtered (2 + 2 * recurse
, stream
);
111 /* For an array of chars, print with string syntax. */
113 ((TYPE_CODE (elttype
) == TYPE_CODE_INT
)
114 || ((current_language
->la_language
== language_m2
)
115 && (TYPE_CODE (elttype
) == TYPE_CODE_CHAR
)))
116 && (format
== 0 || format
== 's'))
118 /* If requested, look for the first null char and only print
119 elements up to it. */
120 if (stop_print_at_null
)
124 /* Look for a NULL char. */
127 && temp_len
< len
&& temp_len
< print_max
;
132 LA_PRINT_STRING (stream
, valaddr
, len
, 0);
137 fprintf_filtered (stream
, "{");
138 /* If this is a virtual function table, print the 0th
139 entry specially, and the rest of the members normally. */
140 if (cp_is_vtbl_ptr_type (elttype
))
143 fprintf_filtered (stream
, "%d vtable entries", len
- 1);
149 val_print_array_elements (type
, valaddr
, address
, stream
,
150 format
, deref_ref
, recurse
, pretty
, i
);
151 fprintf_filtered (stream
, "}");
155 /* Array of unspecified length: treat like pointer to first elt. */
157 goto print_unpacked_pointer
;
160 if (format
&& format
!= 's')
162 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
165 if (vtblprint
&& cp_is_vtbl_ptr_type(type
))
167 /* Print the unmangled name if desired. */
168 /* Print vtable entry - we only get here if we ARE using
169 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
170 print_address_demangle(extract_address (valaddr
, TYPE_LENGTH (type
)),
174 if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_METHOD
)
176 cp_print_class_method (valaddr
, type
, stream
);
178 else if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_MEMBER
)
180 cp_print_class_member (valaddr
,
181 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
186 addr
= unpack_pointer (type
, valaddr
);
187 print_unpacked_pointer
:
188 elttype
= TYPE_TARGET_TYPE (type
);
190 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
192 /* Try to print what function it points to. */
193 print_address_demangle (addr
, stream
, demangle
);
194 /* Return value is irrelevant except for string pointers. */
198 if (addressprint
&& format
!= 's')
200 print_address_numeric (addr
, 1, stream
);
203 /* For a pointer to char or unsigned char, also print the string
204 pointed to, unless pointer is null. */
205 if (TYPE_LENGTH (elttype
) == 1
206 && TYPE_CODE (elttype
) == TYPE_CODE_INT
207 && (format
== 0 || format
== 's')
210 i
= val_print_string (addr
, 0, stream
);
212 else if (cp_is_vtbl_member(type
))
214 /* print vtbl's nicely */
215 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
);
217 struct minimal_symbol
*msymbol
=
218 lookup_minimal_symbol_by_pc (vt_address
);
219 if ((msymbol
!= NULL
) &&
220 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
222 fputs_filtered (" <", stream
);
223 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol
), stream
);
224 fputs_filtered (">", stream
);
226 if (vt_address
&& vtblprint
)
229 struct symbol
*wsym
= (struct symbol
*)NULL
;
232 struct block
*block
= (struct block
*)NULL
;
236 wsym
= lookup_symbol (SYMBOL_NAME(msymbol
), block
,
237 VAR_NAMESPACE
, &is_this_fld
, &s
);
241 wtype
= SYMBOL_TYPE(wsym
);
245 wtype
= TYPE_TARGET_TYPE(type
);
247 vt_val
= value_at (wtype
, vt_address
);
248 val_print (VALUE_TYPE (vt_val
), VALUE_CONTENTS (vt_val
),
249 VALUE_ADDRESS (vt_val
), stream
, format
,
250 deref_ref
, recurse
+ 1, pretty
);
253 fprintf_filtered (stream
, "\n");
254 print_spaces_filtered (2 + 2 * recurse
, stream
);
259 /* Return number of characters printed, including the terminating
260 '\0' if we reached the end. val_print_string takes care including
261 the terminating '\0' if necessary. */
266 case TYPE_CODE_MEMBER
:
267 error ("not implemented: member type in c_val_print");
271 if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_MEMBER
)
273 cp_print_class_member (valaddr
,
274 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
280 fprintf_filtered (stream
, "@");
281 print_address_numeric
282 (extract_address (valaddr
,
283 TARGET_PTR_BIT
/ HOST_CHAR_BIT
), 1, stream
);
285 fputs_filtered (": ", stream
);
287 /* De-reference the reference. */
290 if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) != TYPE_CODE_UNDEF
)
292 value_ptr deref_val
=
294 (TYPE_TARGET_TYPE (type
),
295 unpack_pointer (lookup_pointer_type (builtin_type_void
),
297 val_print (VALUE_TYPE (deref_val
),
298 VALUE_CONTENTS (deref_val
),
299 VALUE_ADDRESS (deref_val
), stream
, format
,
300 deref_ref
, recurse
+ 1, pretty
);
303 fputs_filtered ("???", stream
);
307 case TYPE_CODE_UNION
:
308 if (recurse
&& !unionprint
)
310 fprintf_filtered (stream
, "{...}");
314 case TYPE_CODE_STRUCT
:
315 if (vtblprint
&& cp_is_vtbl_ptr_type(type
))
317 /* Print the unmangled name if desired. */
318 /* Print vtable entry - we only get here if NOT using
319 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
320 print_address_demangle(*((int *) (valaddr
+ /* FIXME bytesex */
321 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8)),
325 cp_print_value_fields (type
, valaddr
, stream
, format
, recurse
, pretty
,
332 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
335 len
= TYPE_NFIELDS (type
);
336 val
= unpack_long (type
, valaddr
);
337 for (i
= 0; i
< len
; i
++)
340 if (val
== TYPE_FIELD_BITPOS (type
, i
))
347 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
351 print_longest (stream
, 'd', 0, val
);
358 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
361 /* FIXME, we should consider, at least for ANSI C language, eliminating
362 the distinction made between FUNCs and POINTERs to FUNCs. */
363 fprintf_filtered (stream
, "{");
364 type_print (type
, "", stream
, -1);
365 fprintf_filtered (stream
, "} ");
366 /* Try to print what function it points to, and its address. */
367 print_address_demangle (address
, stream
, demangle
);
371 /* Do something at least vaguely reasonable, for example if the
372 language is set wrong. */
374 case TYPE_CODE_RANGE
:
375 /* FIXME: create_range_type does not set the unsigned bit in a
376 range type (I think it probably should copy it from the target
377 type), so we won't print values which are too large to
378 fit in a signed integer correctly. */
379 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
380 print with the target type, though, because the size of our type
381 and the target type might differ). */
385 format
= format
? format
: output_format
;
388 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
392 val_print_type_code_int (type
, valaddr
, stream
);
393 /* C and C++ has no single byte int type, char is used instead.
394 Since we don't know whether the value is really intended to
395 be used as an integer or a character, print the character
396 equivalent as well. */
397 if (TYPE_LENGTH (type
) == 1)
399 fputs_filtered (" ", stream
);
400 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
),
407 format
= format
? format
: output_format
;
410 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
414 fprintf_filtered (stream
, TYPE_UNSIGNED (type
) ? "%u" : "%d",
415 unpack_long (type
, valaddr
));
416 fputs_filtered (" ", stream
);
417 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
), stream
);
424 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
428 print_floating (valaddr
, type
, stream
);
433 fprintf_filtered (stream
, "void");
436 case TYPE_CODE_ERROR
:
437 fprintf_filtered (stream
, "<error type>");
440 case TYPE_CODE_UNDEF
:
441 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
442 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
443 and no complete type for struct foo in that file. */
444 fprintf_filtered (stream
, "<incomplete type>");
448 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type
));
455 c_value_print (val
, stream
, format
, pretty
)
459 enum val_prettyprint pretty
;
461 /* A "repeated" value really contains several values in a row.
462 They are made by the @ operator.
463 Print such values as if they were arrays. */
465 if (VALUE_REPEATED (val
))
467 register unsigned int n
= VALUE_REPETITIONS (val
);
468 register unsigned int typelen
= TYPE_LENGTH (VALUE_TYPE (val
));
469 fprintf_filtered (stream
, "{");
470 /* Print arrays of characters using string syntax. */
471 if (typelen
== 1 && TYPE_CODE (VALUE_TYPE (val
)) == TYPE_CODE_INT
473 LA_PRINT_STRING (stream
, VALUE_CONTENTS (val
), n
, 0);
476 value_print_array_elements (val
, stream
, format
, pretty
);
478 fprintf_filtered (stream
, "}");
479 return (n
* typelen
);
483 struct type
*type
= VALUE_TYPE (val
);
485 /* If it is a pointer, indicate what it points to.
487 Print type also if it is a reference.
489 C++: if it is a member pointer, we will take care
490 of that when we print it. */
491 if (TYPE_CODE (type
) == TYPE_CODE_PTR
||
492 TYPE_CODE (type
) == TYPE_CODE_REF
)
494 /* Hack: remove (char *) for char strings. Their
495 type is indicated by the quoted string anyway. */
496 if (TYPE_CODE (type
) == TYPE_CODE_PTR
&&
497 TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) == sizeof(char) &&
498 TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_INT
&&
499 !TYPE_UNSIGNED (TYPE_TARGET_TYPE (type
)))
505 fprintf_filtered (stream
, "(");
506 type_print (type
, "", stream
, -1);
507 fprintf_filtered (stream
, ") ");
510 return (val_print (type
, VALUE_CONTENTS (val
),
511 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
));