1 /* Support for printing C values for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 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"
35 /* Print function pointer with inferior address ADDRESS onto stdio
39 print_function_pointer_address (CORE_ADDR address
, struct ui_file
*stream
)
41 CORE_ADDR func_addr
= CONVERT_FROM_FUNC_PTR_ADDR (address
);
43 /* If the function pointer is represented by a description, print the
44 address of the description. */
45 if (addressprint
&& func_addr
!= address
)
47 fputs_filtered ("@", stream
);
48 print_address_numeric (address
, 1, stream
);
49 fputs_filtered (": ", stream
);
51 print_address_demangle (func_addr
, stream
, demangle
);
55 /* Print data of type TYPE located at VALADDR (within GDB), which came from
56 the inferior at address ADDRESS, onto stdio stream STREAM according to
57 FORMAT (a letter or 0 for natural format). The data at VALADDR is in
60 If the data are a string pointer, returns the number of string characters
63 If DEREF_REF is nonzero, then dereference references, otherwise just print
66 The PRETTY parameter controls prettyprinting. */
69 c_val_print (struct type
*type
, char *valaddr
, int embedded_offset
,
70 CORE_ADDR address
, struct ui_file
*stream
, int format
,
71 int deref_ref
, int recurse
, enum val_prettyprint pretty
)
73 register unsigned int i
= 0; /* Number of characters printed */
81 switch (TYPE_CODE (type
))
84 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
85 if (TYPE_LENGTH (type
) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0)
87 eltlen
= TYPE_LENGTH (elttype
);
88 len
= TYPE_LENGTH (type
) / eltlen
;
89 if (prettyprint_arrays
)
91 print_spaces_filtered (2 + 2 * recurse
, stream
);
93 /* For an array of chars, print with string syntax. */
95 ((TYPE_CODE (elttype
) == TYPE_CODE_INT
)
96 || ((current_language
->la_language
== language_m2
)
97 && (TYPE_CODE (elttype
) == TYPE_CODE_CHAR
)))
98 && (format
== 0 || format
== 's'))
100 /* If requested, look for the first null char and only print
101 elements up to it. */
102 if (stop_print_at_null
)
104 unsigned int temp_len
;
106 /* Look for a NULL char. */
108 (valaddr
+ embedded_offset
)[temp_len
]
109 && temp_len
< len
&& temp_len
< print_max
;
114 LA_PRINT_STRING (stream
, valaddr
+ embedded_offset
, len
, eltlen
, 0);
119 fprintf_filtered (stream
, "{");
120 /* If this is a virtual function table, print the 0th
121 entry specially, and the rest of the members normally. */
122 if (cp_is_vtbl_ptr_type (elttype
))
125 fprintf_filtered (stream
, "%d vtable entries", len
- 1);
131 val_print_array_elements (type
, valaddr
+ embedded_offset
, address
, stream
,
132 format
, deref_ref
, recurse
, pretty
, i
);
133 fprintf_filtered (stream
, "}");
137 /* Array of unspecified length: treat like pointer to first elt. */
139 goto print_unpacked_pointer
;
142 if (format
&& format
!= 's')
144 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
147 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
149 /* Print the unmangled name if desired. */
150 /* Print vtable entry - we only get here if we ARE using
151 -fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
153 = extract_typed_address (valaddr
+ embedded_offset
, type
);
154 print_function_pointer_address (addr
, stream
);
157 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
158 if (TYPE_CODE (elttype
) == TYPE_CODE_METHOD
)
160 cp_print_class_method (valaddr
+ embedded_offset
, type
, stream
);
162 else if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
164 cp_print_class_member (valaddr
+ embedded_offset
,
165 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
170 addr
= unpack_pointer (type
, valaddr
+ embedded_offset
);
171 print_unpacked_pointer
:
173 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
175 /* Try to print what function it points to. */
176 print_function_pointer_address (addr
, stream
);
177 /* Return value is irrelevant except for string pointers. */
181 if (addressprint
&& format
!= 's')
183 print_address_numeric (addr
, 1, stream
);
186 /* For a pointer to char or unsigned char, also print the string
187 pointed to, unless pointer is null. */
188 /* FIXME: need to handle wchar_t here... */
190 if (TYPE_LENGTH (elttype
) == 1
191 && TYPE_CODE (elttype
) == TYPE_CODE_INT
192 && (format
== 0 || format
== 's')
195 i
= val_print_string (addr
, -1, TYPE_LENGTH (elttype
), stream
);
197 else if (cp_is_vtbl_member (type
))
199 /* print vtbl's nicely */
200 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
+ embedded_offset
);
202 struct minimal_symbol
*msymbol
=
203 lookup_minimal_symbol_by_pc (vt_address
);
204 if ((msymbol
!= NULL
) &&
205 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
207 fputs_filtered (" <", stream
);
208 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol
), stream
);
209 fputs_filtered (">", stream
);
211 if (vt_address
&& vtblprint
)
213 struct value
*vt_val
;
214 struct symbol
*wsym
= (struct symbol
*) NULL
;
217 struct block
*block
= (struct block
*) NULL
;
221 wsym
= lookup_symbol (SYMBOL_NAME (msymbol
), block
,
222 VAR_NAMESPACE
, &is_this_fld
, &s
);
226 wtype
= SYMBOL_TYPE (wsym
);
230 wtype
= TYPE_TARGET_TYPE (type
);
232 vt_val
= value_at (wtype
, vt_address
, NULL
);
233 val_print (VALUE_TYPE (vt_val
), VALUE_CONTENTS (vt_val
), 0,
234 VALUE_ADDRESS (vt_val
), stream
, format
,
235 deref_ref
, recurse
+ 1, pretty
);
238 fprintf_filtered (stream
, "\n");
239 print_spaces_filtered (2 + 2 * recurse
, stream
);
244 /* Return number of characters printed, including the terminating
245 '\0' if we reached the end. val_print_string takes care including
246 the terminating '\0' if necessary. */
251 case TYPE_CODE_MEMBER
:
252 error ("not implemented: member type in c_val_print");
256 elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
257 if (TYPE_CODE (elttype
) == TYPE_CODE_MEMBER
)
259 cp_print_class_member (valaddr
+ embedded_offset
,
260 TYPE_DOMAIN_TYPE (elttype
),
267 = extract_typed_address (valaddr
+ embedded_offset
, type
);
268 fprintf_filtered (stream
, "@");
269 print_address_numeric (addr
, 1, stream
);
271 fputs_filtered (": ", stream
);
273 /* De-reference the reference. */
276 if (TYPE_CODE (elttype
) != TYPE_CODE_UNDEF
)
278 struct value
*deref_val
=
280 (TYPE_TARGET_TYPE (type
),
281 unpack_pointer (lookup_pointer_type (builtin_type_void
),
282 valaddr
+ embedded_offset
),
284 val_print (VALUE_TYPE (deref_val
),
285 VALUE_CONTENTS (deref_val
),
287 VALUE_ADDRESS (deref_val
),
295 fputs_filtered ("???", stream
);
299 case TYPE_CODE_UNION
:
300 if (recurse
&& !unionprint
)
302 fprintf_filtered (stream
, "{...}");
306 case TYPE_CODE_STRUCT
:
307 /*FIXME: Abstract this away */
308 if (vtblprint
&& cp_is_vtbl_ptr_type (type
))
310 /* Print the unmangled name if desired. */
311 /* Print vtable entry - we only get here if NOT using
312 -fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
313 int offset
= (embedded_offset
+
314 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8);
315 struct type
*field_type
= TYPE_FIELD_TYPE (type
, VTBL_FNADDR_OFFSET
);
317 = extract_typed_address (valaddr
+ offset
, field_type
);
319 print_function_pointer_address (addr
, stream
);
322 cp_print_value_fields (type
, type
, valaddr
, embedded_offset
, address
, stream
, format
,
323 recurse
, pretty
, NULL
, 0);
329 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
332 len
= TYPE_NFIELDS (type
);
333 val
= unpack_long (type
, valaddr
+ embedded_offset
);
334 for (i
= 0; i
< len
; i
++)
337 if (val
== TYPE_FIELD_BITPOS (type
, i
))
344 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
348 print_longest (stream
, 'd', 0, val
);
355 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
358 /* FIXME, we should consider, at least for ANSI C language, eliminating
359 the distinction made between FUNCs and POINTERs to FUNCs. */
360 fprintf_filtered (stream
, "{");
361 type_print (type
, "", stream
, -1);
362 fprintf_filtered (stream
, "} ");
363 /* Try to print what function it points to, and its address. */
364 print_address_demangle (address
, stream
, demangle
);
368 format
= format
? format
: output_format
;
370 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
373 val
= unpack_long (type
, valaddr
+ embedded_offset
);
375 fputs_filtered ("false", stream
);
377 fputs_filtered ("true", stream
);
379 print_longest (stream
, 'd', 0, val
);
383 case TYPE_CODE_RANGE
:
384 /* FIXME: create_range_type does not set the unsigned bit in a
385 range type (I think it probably should copy it from the target
386 type), so we won't print values which are too large to
387 fit in a signed integer correctly. */
388 /* FIXME: Doesn't handle ranges of enums correctly. (Can't just
389 print with the target type, though, because the size of our type
390 and the target type might differ). */
394 format
= format
? format
: output_format
;
397 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
401 val_print_type_code_int (type
, valaddr
+ embedded_offset
, stream
);
402 /* C and C++ has no single byte int type, char is used instead.
403 Since we don't know whether the value is really intended to
404 be used as an integer or a character, print the character
405 equivalent as well. */
406 if (TYPE_LENGTH (type
) == 1)
408 fputs_filtered (" ", stream
);
409 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
+ embedded_offset
),
416 format
= format
? format
: output_format
;
419 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
423 val
= unpack_long (type
, valaddr
+ embedded_offset
);
424 if (TYPE_UNSIGNED (type
))
425 fprintf_filtered (stream
, "%u", (unsigned int) val
);
427 fprintf_filtered (stream
, "%d", (int) val
);
428 fputs_filtered (" ", stream
);
429 LA_PRINT_CHAR ((unsigned char) val
, stream
);
436 print_scalar_formatted (valaddr
+ embedded_offset
, type
, format
, 0, stream
);
440 print_floating (valaddr
+ embedded_offset
, type
, stream
);
444 case TYPE_CODE_METHOD
:
446 struct value
*v
= value_at (type
, address
, NULL
);
447 cp_print_class_method (VALUE_CONTENTS (value_addr (v
)),
448 lookup_pointer_type (type
), stream
);
453 fprintf_filtered (stream
, "void");
456 case TYPE_CODE_ERROR
:
457 fprintf_filtered (stream
, "<error type>");
460 case TYPE_CODE_UNDEF
:
461 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
462 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
463 and no complete type for struct foo in that file. */
464 fprintf_filtered (stream
, "<incomplete type>");
467 case TYPE_CODE_COMPLEX
:
469 print_scalar_formatted (valaddr
+ embedded_offset
,
470 TYPE_TARGET_TYPE (type
),
473 print_floating (valaddr
+ embedded_offset
, TYPE_TARGET_TYPE (type
),
475 fprintf_filtered (stream
, " + ");
477 print_scalar_formatted (valaddr
+ embedded_offset
478 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
479 TYPE_TARGET_TYPE (type
),
482 print_floating (valaddr
+ embedded_offset
483 + TYPE_LENGTH (TYPE_TARGET_TYPE (type
)),
484 TYPE_TARGET_TYPE (type
),
486 fprintf_filtered (stream
, " * I");
490 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type
));
497 c_value_print (struct value
*val
, struct ui_file
*stream
, int format
,
498 enum val_prettyprint pretty
)
500 struct type
*type
= VALUE_TYPE (val
);
501 struct type
*real_type
;
502 int full
, top
, using_enc
;
504 /* If it is a pointer, indicate what it points to.
506 Print type also if it is a reference.
508 C++: if it is a member pointer, we will take care
509 of that when we print it. */
510 if (TYPE_CODE (type
) == TYPE_CODE_PTR
||
511 TYPE_CODE (type
) == TYPE_CODE_REF
)
513 /* Hack: remove (char *) for char strings. Their
514 type is indicated by the quoted string anyway. */
515 if (TYPE_CODE (type
) == TYPE_CODE_PTR
&&
516 TYPE_NAME (type
) == NULL
&&
517 TYPE_NAME (TYPE_TARGET_TYPE (type
)) != NULL
&&
518 STREQ (TYPE_NAME (TYPE_TARGET_TYPE (type
)), "char"))
522 else if (objectprint
&& (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
525 if (TYPE_CODE(type
) == TYPE_CODE_REF
)
527 /* Copy value, change to pointer, so we don't get an
528 * error about a non-pointer type in value_rtti_target_type
530 struct value
*temparg
;
531 temparg
=value_copy(val
);
532 VALUE_TYPE (temparg
) = lookup_pointer_type(TYPE_TARGET_TYPE(type
));
535 /* Pointer to class, check real type of object */
536 fprintf_filtered (stream
, "(");
537 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
540 /* RTTI entry found */
541 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
543 /* create a pointer type pointing to the real type */
544 type
= lookup_pointer_type (real_type
);
548 /* create a reference type referencing the real type */
549 type
= lookup_reference_type (real_type
);
551 /* JYG: Need to adjust pointer value. */
552 val
->aligner
.contents
[0] -= top
;
554 /* Note: When we look up RTTI entries, we don't get any
555 information on const or volatile attributes */
557 type_print (type
, "", stream
, -1);
558 fprintf_filtered (stream
, ") ");
563 fprintf_filtered (stream
, "(");
564 type_print (type
, "", stream
, -1);
565 fprintf_filtered (stream
, ") ");
568 if (objectprint
&& (TYPE_CODE (VALUE_TYPE (val
)) == TYPE_CODE_CLASS
))
570 /* Attempt to determine real type of object */
571 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
574 /* We have RTTI information, so use it */
575 val
= value_full_object (val
, real_type
, full
, top
, using_enc
);
576 fprintf_filtered (stream
, "(%s%s) ",
577 TYPE_NAME (real_type
),
578 full
? "" : " [incomplete object]");
579 /* Print out object: enclosing type is same as real_type if full */
580 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
581 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
582 /* Note: When we look up RTTI entries, we don't get any information on
583 const or volatile attributes */
585 else if (type
!= VALUE_ENCLOSING_TYPE (val
))
587 /* No RTTI information, so let's do our best */
588 fprintf_filtered (stream
, "(%s ?) ",
589 TYPE_NAME (VALUE_ENCLOSING_TYPE (val
)));
590 return val_print (VALUE_ENCLOSING_TYPE (val
), VALUE_CONTENTS_ALL (val
), 0,
591 VALUE_ADDRESS (val
), stream
, format
, 1, 0, pretty
);
593 /* Otherwise, we end up at the return outside this "if" */
596 return val_print (type
, VALUE_CONTENTS_ALL (val
), VALUE_EMBEDDED_OFFSET (val
),
598 stream
, format
, 1, 0, pretty
);
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