1 /* Support for printing C values for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991-1997, 2000
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,
20 Boston, MA 02111-1307, USA. */
25 #include "expression.h"
33 /* Print data of type TYPE located at VALADDR (within GDB), which came from
34 the inferior at address ADDRESS, onto stdio stream STREAM according to
35 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
38 If the data are a string pointer, returns the number of string characters
41 If DEREF_REF is nonzero, then dereference references, otherwise just print
44 The PRETTY parameter controls prettyprinting. */
47 c_val_print (type
, valaddr
, embedded_offset
, address
, stream
, format
, deref_ref
, recurse
,
53 struct ui_file
*stream
;
57 enum val_prettyprint pretty
;
59 register unsigned int i
= 0; /* Number of characters printed */
67 switch (TYPE_CODE (type
))
70 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
71 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0)
73 eltlen
= TYPE_LENGTH (elttype
);
74 len
= TYPE_LENGTH (type
) / eltlen
;
75 if (prettyprint_arrays
)
77 print_spaces_filtered (2 + 2 * recurse
, stream
);
79 /* For an array of chars, print with string syntax. */
81 ((TYPE_CODE (elttype
) == TYPE_CODE_INT
)
82 || ((current_language
->la_language
== language_m2
)
83 && (TYPE_CODE (elttype
) == TYPE_CODE_CHAR
)))
84 && (format
== 0 || format
== 's'))
86 /* If requested, look for the first null char and only print
88 if (stop_print_at_null
)
90 unsigned int temp_len
;
92 /* Look for a NULL char. */
94 (valaddr
+ embedded_offset
)[temp_len
]
95 && temp_len
< len
&& temp_len
< print_max
;
100 LA_PRINT_STRING (stream
, valaddr
+ embedded_offset
, len
, eltlen
, 0);
105 fprintf_filtered (stream
, "{");
106 /* If this is a virtual function table, print the 0th
107 entry specially, and the rest of the members normally. */
108 if (cp_is_vtbl_ptr_type (elttype
))
111 fprintf_filtered (stream
, "%d vtable entries", len
- 1);
117 val_print_array_elements (type
, valaddr
+ embedded_offset
, address
, stream
,
118 format
, deref_ref
, recurse
, pretty
, i
);
119 fprintf_filtered (stream
, "}");
123 /* Array of unspecified length: treat like pointer to first elt. */
125 goto print_unpacked_pointer
;
128 if (format
&& format
!= 's')
130 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
133 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
135 /* Print the unmangled name if desired. */
136 /* Print vtable entry - we only get here if we ARE using
137 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
139 = extract_typed_address (valaddr
+ embedded_offset
, type
);
140 print_address_demangle (addr
, stream
, demangle
);
143 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
144 if (TYPE_CODE (elttype
) == TYPE_CODE_METHOD
)
146 cp_print_class_method (valaddr
+ embedded_offset
, type
, stream
);
148 else if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
150 cp_print_class_member (valaddr
+ embedded_offset
,
151 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
156 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
157 print_unpacked_pointer
:
158 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
160 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
162 /* Try to print what function it points to. */
163 print_address_demangle (addr
, stream
, demangle
);
164 /* Return value is irrelevant except for string pointers. */
168 if (addressprint
&& format
!= 's')
170 print_address_numeric (addr
, 1, stream
);
173 /* For a pointer to char or unsigned char, also print the string
174 pointed to, unless pointer is null. */
175 /* FIXME: need to handle wchar_t here... */
177 if (TYPE_LENGTH (elttype
) == 1
178 && TYPE_CODE (elttype
) == TYPE_CODE_INT
179 && (format
== 0 || format
== 's')
182 i
= val_print_string (addr
, -1, TYPE_LENGTH (elttype
), stream
);
184 else if (cp_is_vtbl_member (type
))
186 /* print vtbl's nicely */
187 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
189 struct minimal_symbol
*msymbol
=
190 lookup_minimal_symbol_by_pc (vt_address
);
191 if ((msymbol
!= NULL
) &&
192 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
194 fputs_filtered (" <", stream
);
195 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol
), stream
);
196 fputs_filtered (">", stream
);
198 if (vt_address
&& vtblprint
)
201 struct symbol
*wsym
= (struct symbol
*) NULL
;
204 struct block
*block
= (struct block
*) NULL
;
208 wsym
= lookup_symbol (SYMBOL_NAME (msymbol
), block
,
209 VAR_NAMESPACE
, &is_this_fld
, &s
);
213 wtype
= SYMBOL_TYPE (wsym
);
217 wtype
= TYPE_TARGET_TYPE (type
);
219 vt_val
= value_at (wtype
, vt_address
, NULL
);
220 val_print (VALUE_TYPE (vt_val
), VALUE_CONTENTS (vt_val
), 0,
221 VALUE_ADDRESS (vt_val
), stream
, format
,
222 deref_ref
, recurse
+ 1, pretty
);
225 fprintf_filtered (stream
, "\n");
226 print_spaces_filtered (2 + 2 * recurse
, stream
);
231 /* Return number of characters printed, including the terminating
232 '\0' if we reached the end. val_print_string takes care including
233 the terminating '\0' if necessary. */
238 case TYPE_CODE_MEMBER
:
239 error ("not implemented: member type in c_val_print");
243 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
244 if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
246 cp_print_class_member (valaddr
+ embedded_offset
,
247 TYPE_DOMAIN_TYPE (elttype
),
254 = extract_typed_address (valaddr
+ embedded_offset
, type
);
255 fprintf_filtered (stream
, "@");
256 print_address_numeric (addr
, 1, stream
);
258 fputs_filtered (": ", stream
);
260 /* De-reference the reference. */
263 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
265 value_ptr deref_val
=
267 (TYPE_TARGET_TYPE (type
),
268 unpack_pointer (lookup_pointer_type (builtin_type_void
),
269 valaddr
+ embedded_offset
),
271 val_print (VALUE_TYPE (deref_val
),
272 VALUE_CONTENTS (deref_val
),
274 VALUE_ADDRESS (deref_val
),
282 fputs_filtered ("???", stream
);
286 case TYPE_CODE_UNION
:
287 if (recurse
&& !unionprint
)
289 fprintf_filtered (stream
, "{...}");
293 case TYPE_CODE_STRUCT
:
294 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
296 /* Print the unmangled name if desired. */
297 /* Print vtable entry - we only get here if NOT using
298 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
299 int offset
= (embedded_offset
+
300 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8);
301 struct type
*field_type
= TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
);
303 = extract_typed_address (valaddr
+ offset
, field_type
);
305 print_address_demangle (addr
, stream
, demangle
);
308 cp_print_value_fields (type
, type
, valaddr
, embedded_offset
, address
, stream
, format
,
309 recurse
, pretty
, NULL
, 0);
315 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
318 len
= TYPE_NFIELDS (type
);
319 val
= unpack_long (type
, valaddr
+ embedded_offset
);
320 for (i
= 0; i
< len
; i
++)
323 if (val
== TYPE_FIELD_BITPOS (type
, i
))
330 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
334 print_longest (stream
, 'd', 0, val
);
341 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
344 /* FIXME, we should consider, at least for ANSI C language, eliminating
345 the distinction made between FUNCs and POINTERs to FUNCs. */
346 fprintf_filtered (stream
, "{");
347 type_print (type
, "", stream
, -1);
348 fprintf_filtered (stream
, "} ");
349 /* Try to print what function it points to, and its address. */
350 print_address_demangle (address
, stream
, demangle
);
354 format
= format
? format
: output_format
;
356 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
359 val
= unpack_long (type
, valaddr
+ embedded_offset
);
361 fputs_filtered ("false", stream
);
363 fputs_filtered ("true", stream
);
365 print_longest (stream
, 'd', 0, val
);
369 case TYPE_CODE_RANGE
:
370 /* FIXME: create_range_type does not set the unsigned bit in a
371 range type (I think it probably should copy it from the target
372 type), so we won't print values which are too large to
373 fit in a signed integer correctly. */
374 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
375 print with the target type, though, because the size of our type
376 and the target type might differ). */
380 format
= format
? format
: output_format
;
383 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
387 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
388 /* C and C++ has no single byte int type, char is used instead.
389 Since we don't know whether the value is really intended to
390 be used as an integer or a character, print the character
391 equivalent as well. */
392 if (TYPE_LENGTH (type
) == 1)
394 fputs_filtered (" ", stream
);
395 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
402 format
= format
? format
: output_format
;
405 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
409 val
= unpack_long (type
, valaddr
+ embedded_offset
);
410 if (TYPE_UNSIGNED (type
))
411 fprintf_filtered (stream
, "%u", (unsigned int) val
);
413 fprintf_filtered (stream
, "%d", (int) val
);
414 fputs_filtered (" ", stream
);
415 LA_PRINT_CHAR ((unsigned char) val
, stream
);
422 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
426 print_floating (valaddr
+ embedded_offset
, type
, stream
);
430 case TYPE_CODE_METHOD
:
431 cp_print_class_method (valaddr
+ embedded_offset
, lookup_pointer_type (type
), stream
);
435 fprintf_filtered (stream
, "void");
438 case TYPE_CODE_ERROR
:
439 fprintf_filtered (stream
, "<error type>");
442 case TYPE_CODE_UNDEF
:
443 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
444 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
445 and no complete type for struct foo in that file. */
446 fprintf_filtered (stream
, "<incomplete type>");
450 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type
));
457 c_value_print (val
, stream
, format
, pretty
)
459 struct ui_file
*stream
;
461 enum val_prettyprint pretty
;
463 struct type
*type
= VALUE_TYPE (val
);
464 struct type
*real_type
;
465 int full
, top
, using_enc
;
467 /* If it is a pointer, indicate what it points to.
469 Print type also if it is a reference.
471 C++: if it is a member pointer, we will take care
472 of that when we print it. */
473 if (TYPE_CODE (type
) == TYPE_CODE_PTR
||
474 TYPE_CODE (type
) == TYPE_CODE_REF
)
476 /* Hack: remove (char *) for char strings. Their
477 type is indicated by the quoted string anyway. */
478 if (TYPE_CODE (type
) == TYPE_CODE_PTR
&&
479 TYPE_NAME (type
) == NULL
&&
480 TYPE_NAME (TYPE_TARGET_TYPE (type
)) != NULL
&&
481 STREQ (TYPE_NAME (TYPE_TARGET_TYPE (type
)), "char"))
485 else if (objectprint
&& (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
488 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
490 /* Copy value, change to pointer, so we don't get an
491 * error about a non-pointer type in value_rtti_target_type
494 temparg
=value_copy(val
);
495 VALUE_TYPE (temparg
) = lookup_pointer_type(TYPE_TARGET_TYPE(type
));
498 /* Pointer to class, check real type of object */
499 fprintf_filtered (stream
, "(");
500 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
503 /* RTTI entry found */
504 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
506 /* create a pointer type pointing to the real type */
507 type
= lookup_pointer_type (real_type
);
511 /* create a reference type referencing the real type */
512 type
= lookup_reference_type (real_type
);
514 /* JYG: Need to adjust pointer value. */
515 val
->aligner
.contents
[0] -= top
;
517 /* Note: When we look up RTTI entries, we don't get any
518 information on const or volatile attributes */
520 type_print (type
, "", stream
, -1);
521 fprintf_filtered (stream
, ") ");
526 fprintf_filtered (stream
, "(");
527 type_print (type
, "", stream
, -1);
528 fprintf_filtered (stream
, ") ");
531 if (objectprint
&& (TYPE_CODE (VALUE_TYPE (val
)) == TYPE_CODE_CLASS
))
533 /* Attempt to determine real type of object */
534 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
537 /* We have RTTI information, so use it */
538 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
539 fprintf_filtered (stream
, "(%s%s) ",
540 TYPE_NAME (real_type
),
541 full
? "" : " [incomplete object]");
542 /* Print out object: enclosing type is same as real_type if full */
543 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
544 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
545 /* Note: When we look up RTTI entries, we don't get any information on
546 const or volatile attributes */
548 else if (type
!= VALUE_ENCLOSING_TYPE (val
))
550 /* No RTTI information, so let's do our best */
551 fprintf_filtered (stream
, "(%s ?) ",
552 TYPE_NAME (VALUE_ENCLOSING_TYPE (val
)));
553 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
554 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
556 /* Otherwise, we end up at the return outside this "if" */
559 return val_print (type
, VALUE_CONTENTS_ALL (val
), VALUE_EMBEDDED_OFFSET (val
),
561 stream
, format
, 1, 0, pretty
);
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