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 function pointer with inferior address ADDRESS onto stdio
37 print_function_pointer_address (CORE_ADDR address
, struct ui_file
*stream
)
39 CORE_ADDR func_addr
= CONVERT_FROM_FUNC_PTR_ADDR (address
);
41 /* If the function pointer is represented by a description, print the
42 address of the description. */
43 if (addressprint
&& func_addr
!= address
)
45 fputs_filtered ("@", stream
);
46 print_address_numeric (address
, 1, stream
);
47 fputs_filtered (": ", stream
);
49 print_address_demangle (func_addr
, stream
, demangle
);
53 /* Print data of type TYPE located at VALADDR (within GDB), which came from
54 the inferior at address ADDRESS, onto stdio stream STREAM according to
55 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
58 If the data are a string pointer, returns the number of string characters
61 If DEREF_REF is nonzero, then dereference references, otherwise just print
64 The PRETTY parameter controls prettyprinting. */
67 c_val_print (struct type
*type
, char *valaddr
, int embedded_offset
,
68 CORE_ADDR address
, struct ui_file
*stream
, int format
,
69 int deref_ref
, int recurse
, enum val_prettyprint pretty
)
71 register unsigned int i
= 0; /* Number of characters printed */
79 switch (TYPE_CODE (type
))
82 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
83 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0)
85 eltlen
= TYPE_LENGTH (elttype
);
86 len
= TYPE_LENGTH (type
) / eltlen
;
87 if (prettyprint_arrays
)
89 print_spaces_filtered (2 + 2 * recurse
, stream
);
91 /* For an array of chars, print with string syntax. */
93 ((TYPE_CODE (elttype
) == TYPE_CODE_INT
)
94 || ((current_language
->la_language
== language_m2
)
95 && (TYPE_CODE (elttype
) == TYPE_CODE_CHAR
)))
96 && (format
== 0 || format
== 's'))
98 /* If requested, look for the first null char and only print
100 if (stop_print_at_null
)
102 unsigned int temp_len
;
104 /* Look for a NULL char. */
106 (valaddr
+ embedded_offset
)[temp_len
]
107 && temp_len
< len
&& temp_len
< print_max
;
112 LA_PRINT_STRING (stream
, valaddr
+ embedded_offset
, len
, eltlen
, 0);
117 fprintf_filtered (stream
, "{");
118 /* If this is a virtual function table, print the 0th
119 entry specially, and the rest of the members normally. */
120 if (cp_is_vtbl_ptr_type (elttype
))
123 fprintf_filtered (stream
, "%d vtable entries", len
- 1);
129 val_print_array_elements (type
, valaddr
+ embedded_offset
, address
, stream
,
130 format
, deref_ref
, recurse
, pretty
, i
);
131 fprintf_filtered (stream
, "}");
135 /* Array of unspecified length: treat like pointer to first elt. */
137 goto print_unpacked_pointer
;
140 if (format
&& format
!= 's')
142 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
145 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
147 /* Print the unmangled name if desired. */
148 /* Print vtable entry - we only get here if we ARE using
149 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
151 = extract_typed_address (valaddr
+ embedded_offset
, type
);
152 print_function_pointer_address (addr
, stream
);
155 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
156 if (TYPE_CODE (elttype
) == TYPE_CODE_METHOD
)
158 cp_print_class_method (valaddr
+ embedded_offset
, type
, stream
);
160 else if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
162 cp_print_class_member (valaddr
+ embedded_offset
,
163 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
168 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
169 print_unpacked_pointer
:
170 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
172 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
174 /* Try to print what function it points to. */
175 print_function_pointer_address (addr
, stream
);
176 /* Return value is irrelevant except for string pointers. */
180 if (addressprint
&& format
!= 's')
182 print_address_numeric (addr
, 1, stream
);
185 /* For a pointer to char or unsigned char, also print the string
186 pointed to, unless pointer is null. */
187 /* FIXME: need to handle wchar_t here... */
189 if (TYPE_LENGTH (elttype
) == 1
190 && TYPE_CODE (elttype
) == TYPE_CODE_INT
191 && (format
== 0 || format
== 's')
194 i
= val_print_string (addr
, -1, TYPE_LENGTH (elttype
), stream
);
196 else if (cp_is_vtbl_member (type
))
198 /* print vtbl's nicely */
199 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
201 struct minimal_symbol
*msymbol
=
202 lookup_minimal_symbol_by_pc (vt_address
);
203 if ((msymbol
!= NULL
) &&
204 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
206 fputs_filtered (" <", stream
);
207 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol
), stream
);
208 fputs_filtered (">", stream
);
210 if (vt_address
&& vtblprint
)
213 struct symbol
*wsym
= (struct symbol
*) NULL
;
216 struct block
*block
= (struct block
*) NULL
;
220 wsym
= lookup_symbol (SYMBOL_NAME (msymbol
), block
,
221 VAR_NAMESPACE
, &is_this_fld
, &s
);
225 wtype
= SYMBOL_TYPE (wsym
);
229 wtype
= TYPE_TARGET_TYPE (type
);
231 vt_val
= value_at (wtype
, vt_address
, NULL
);
232 val_print (VALUE_TYPE (vt_val
), VALUE_CONTENTS (vt_val
), 0,
233 VALUE_ADDRESS (vt_val
), stream
, format
,
234 deref_ref
, recurse
+ 1, pretty
);
237 fprintf_filtered (stream
, "\n");
238 print_spaces_filtered (2 + 2 * recurse
, stream
);
243 /* Return number of characters printed, including the terminating
244 '\0' if we reached the end. val_print_string takes care including
245 the terminating '\0' if necessary. */
250 case TYPE_CODE_MEMBER
:
251 error ("not implemented: member type in c_val_print");
255 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
256 if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
258 cp_print_class_member (valaddr
+ embedded_offset
,
259 TYPE_DOMAIN_TYPE (elttype
),
266 = extract_typed_address (valaddr
+ embedded_offset
, type
);
267 fprintf_filtered (stream
, "@");
268 print_address_numeric (addr
, 1, stream
);
270 fputs_filtered (": ", stream
);
272 /* De-reference the reference. */
275 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
277 value_ptr deref_val
=
279 (TYPE_TARGET_TYPE (type
),
280 unpack_pointer (lookup_pointer_type (builtin_type_void
),
281 valaddr
+ embedded_offset
),
283 val_print (VALUE_TYPE (deref_val
),
284 VALUE_CONTENTS (deref_val
),
286 VALUE_ADDRESS (deref_val
),
294 fputs_filtered ("???", stream
);
298 case TYPE_CODE_UNION
:
299 if (recurse
&& !unionprint
)
301 fprintf_filtered (stream
, "{...}");
305 case TYPE_CODE_STRUCT
:
306 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
308 /* Print the unmangled name if desired. */
309 /* Print vtable entry - we only get here if NOT using
310 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
311 int offset
= (embedded_offset
+
312 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8);
313 struct type
*field_type
= TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
);
315 = extract_typed_address (valaddr
+ offset
, field_type
);
317 print_function_pointer_address (addr
, stream
);
320 cp_print_value_fields (type
, type
, valaddr
, embedded_offset
, address
, stream
, format
,
321 recurse
, pretty
, NULL
, 0);
327 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
330 len
= TYPE_NFIELDS (type
);
331 val
= unpack_long (type
, valaddr
+ embedded_offset
);
332 for (i
= 0; i
< len
; i
++)
335 if (val
== TYPE_FIELD_BITPOS (type
, i
))
342 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
346 print_longest (stream
, 'd', 0, val
);
353 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
356 /* FIXME, we should consider, at least for ANSI C language, eliminating
357 the distinction made between FUNCs and POINTERs to FUNCs. */
358 fprintf_filtered (stream
, "{");
359 type_print (type
, "", stream
, -1);
360 fprintf_filtered (stream
, "} ");
361 /* Try to print what function it points to, and its address. */
362 print_address_demangle (address
, stream
, demangle
);
366 format
= format
? format
: output_format
;
368 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
371 val
= unpack_long (type
, valaddr
+ embedded_offset
);
373 fputs_filtered ("false", stream
);
375 fputs_filtered ("true", stream
);
377 print_longest (stream
, 'd', 0, val
);
381 case TYPE_CODE_RANGE
:
382 /* FIXME: create_range_type does not set the unsigned bit in a
383 range type (I think it probably should copy it from the target
384 type), so we won't print values which are too large to
385 fit in a signed integer correctly. */
386 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
387 print with the target type, though, because the size of our type
388 and the target type might differ). */
392 format
= format
? format
: output_format
;
395 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
399 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
400 /* C and C++ has no single byte int type, char is used instead.
401 Since we don't know whether the value is really intended to
402 be used as an integer or a character, print the character
403 equivalent as well. */
404 if (TYPE_LENGTH (type
) == 1)
406 fputs_filtered (" ", stream
);
407 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
414 format
= format
? format
: output_format
;
417 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
421 val
= unpack_long (type
, valaddr
+ embedded_offset
);
422 if (TYPE_UNSIGNED (type
))
423 fprintf_filtered (stream
, "%u", (unsigned int) val
);
425 fprintf_filtered (stream
, "%d", (int) val
);
426 fputs_filtered (" ", stream
);
427 LA_PRINT_CHAR ((unsigned char) val
, stream
);
434 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
438 print_floating (valaddr
+ embedded_offset
, type
, stream
);
442 case TYPE_CODE_METHOD
:
443 cp_print_class_method (valaddr
+ embedded_offset
, lookup_pointer_type (type
), stream
);
447 fprintf_filtered (stream
, "void");
450 case TYPE_CODE_ERROR
:
451 fprintf_filtered (stream
, "<error type>");
454 case TYPE_CODE_UNDEF
:
455 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
456 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
457 and no complete type for struct foo in that file. */
458 fprintf_filtered (stream
, "<incomplete type>");
462 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type
));
469 c_value_print (value_ptr val
, struct ui_file
*stream
, int format
,
470 enum val_prettyprint pretty
)
472 struct type
*type
= VALUE_TYPE (val
);
473 struct type
*real_type
;
474 int full
, top
, using_enc
;
476 /* If it is a pointer, indicate what it points to.
478 Print type also if it is a reference.
480 C++: if it is a member pointer, we will take care
481 of that when we print it. */
482 if (TYPE_CODE (type
) == TYPE_CODE_PTR
||
483 TYPE_CODE (type
) == TYPE_CODE_REF
)
485 /* Hack: remove (char *) for char strings. Their
486 type is indicated by the quoted string anyway. */
487 if (TYPE_CODE (type
) == TYPE_CODE_PTR
&&
488 TYPE_NAME (type
) == NULL
&&
489 TYPE_NAME (TYPE_TARGET_TYPE (type
)) != NULL
&&
490 STREQ (TYPE_NAME (TYPE_TARGET_TYPE (type
)), "char"))
494 else if (objectprint
&& (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
497 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
499 /* Copy value, change to pointer, so we don't get an
500 * error about a non-pointer type in value_rtti_target_type
503 temparg
=value_copy(val
);
504 VALUE_TYPE (temparg
) = lookup_pointer_type(TYPE_TARGET_TYPE(type
));
507 /* Pointer to class, check real type of object */
508 fprintf_filtered (stream
, "(");
509 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
512 /* RTTI entry found */
513 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
515 /* create a pointer type pointing to the real type */
516 type
= lookup_pointer_type (real_type
);
520 /* create a reference type referencing the real type */
521 type
= lookup_reference_type (real_type
);
523 /* JYG: Need to adjust pointer value. */
524 val
->aligner
.contents
[0] -= top
;
526 /* Note: When we look up RTTI entries, we don't get any
527 information on const or volatile attributes */
529 type_print (type
, "", stream
, -1);
530 fprintf_filtered (stream
, ") ");
535 fprintf_filtered (stream
, "(");
536 type_print (type
, "", stream
, -1);
537 fprintf_filtered (stream
, ") ");
540 if (objectprint
&& (TYPE_CODE (VALUE_TYPE (val
)) == TYPE_CODE_CLASS
))
542 /* Attempt to determine real type of object */
543 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
546 /* We have RTTI information, so use it */
547 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
548 fprintf_filtered (stream
, "(%s%s) ",
549 TYPE_NAME (real_type
),
550 full
? "" : " [incomplete object]");
551 /* Print out object: enclosing type is same as real_type if full */
552 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
553 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
554 /* Note: When we look up RTTI entries, we don't get any information on
555 const or volatile attributes */
557 else if (type
!= VALUE_ENCLOSING_TYPE (val
))
559 /* No RTTI information, so let's do our best */
560 fprintf_filtered (stream
, "(%s ?) ",
561 TYPE_NAME (VALUE_ENCLOSING_TYPE (val
)));
562 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
563 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
565 /* Otherwise, we end up at the return outside this "if" */
568 return val_print (type
, VALUE_CONTENTS_ALL (val
), VALUE_EMBEDDED_OFFSET (val
),
570 stream
, format
, 1, 0, pretty
);
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