1 /* Support for printing C values for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
23 #include "expression.h"
31 extern int vtblprint
; /* Controls printing of vtbl's */
32 extern int demangle
; /* whether to print C++ syms raw or src-form */
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. */
112 if (eltlen
== 1 && TYPE_CODE (elttype
) == TYPE_CODE_INT
113 && (format
== 0 || format
== 's'))
115 LA_PRINT_STRING (stream
, valaddr
, len
, 0);
120 fprintf_filtered (stream
, "{");
121 /* If this is a virtual function table, print the 0th
122 entry specially, and the rest of the members normally. */
123 if (cp_is_vtbl_ptr_type (elttype
))
126 fprintf_filtered (stream
, "%d vtable entries", len
- 1);
132 val_print_array_elements (type
, valaddr
, address
, stream
,
133 format
, deref_ref
, recurse
, pretty
, i
);
134 fprintf_filtered (stream
, "}");
138 /* Array of unspecified length: treat like pointer to first elt. */
140 goto print_unpacked_pointer
;
143 if (format
&& format
!= 's')
145 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
148 if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_METHOD
)
150 cp_print_class_method (valaddr
, type
, stream
);
152 else if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_MEMBER
)
154 cp_print_class_member (valaddr
,
155 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
160 addr
= unpack_pointer (type
, valaddr
);
161 print_unpacked_pointer
:
162 elttype
= TYPE_TARGET_TYPE (type
);
164 if (TYPE_CODE (elttype
) == TYPE_CODE_FUNC
)
166 /* Try to print what function it points to. */
167 print_address_demangle (addr
, stream
, demangle
);
168 /* Return value is irrelevant except for string pointers. */
172 if (addressprint
&& format
!= 's')
174 fprintf_filtered (stream
, "0x%lx", (unsigned long)addr
);
177 /* For a pointer to char or unsigned char, also print the string
178 pointed to, unless pointer is null. */
179 if (TYPE_LENGTH (elttype
) == 1
180 && TYPE_CODE (elttype
) == TYPE_CODE_INT
181 && (format
== 0 || format
== 's')
184 i
= val_print_string (addr
, 0, stream
);
186 else if (cp_is_vtbl_member(type
))
188 /* print vtbl's nicely */
189 CORE_ADDR vt_address
= unpack_pointer (type
, valaddr
);
191 struct minimal_symbol
*msymbol
=
192 lookup_minimal_symbol_by_pc (vt_address
);
193 if ((msymbol
!= NULL
) &&
194 (vt_address
== SYMBOL_VALUE_ADDRESS (msymbol
)))
196 fputs_filtered (" <", stream
);
197 fputs_filtered (SYMBOL_SOURCE_NAME (msymbol
), stream
);
198 fputs_filtered (">", stream
);
203 struct symbol
*wsym
= (struct symbol
*)NULL
;
206 struct block
*block
= (struct block
*)NULL
;
210 wsym
= lookup_symbol (SYMBOL_NAME(msymbol
), block
,
211 VAR_NAMESPACE
, &is_this_fld
, &s
);
215 wtype
= SYMBOL_TYPE(wsym
);
219 wtype
= TYPE_TARGET_TYPE(type
);
221 vt_val
= value_at (wtype
, vt_address
);
222 val_print (VALUE_TYPE (vt_val
), VALUE_CONTENTS (vt_val
),
223 VALUE_ADDRESS (vt_val
), stream
, format
,
224 deref_ref
, recurse
+ 1, pretty
);
227 fprintf_filtered (stream
, "\n");
228 print_spaces_filtered (2 + 2 * recurse
, stream
);
233 /* Return number of characters printed, plus one for the
234 terminating null if we have "reached the end". */
235 return (i
+ (print_max
&& i
!= print_max
));
239 case TYPE_CODE_MEMBER
:
240 error ("not implemented: member type in c_val_print");
244 if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_MEMBER
)
246 cp_print_class_member (valaddr
,
247 TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type
)),
253 fprintf_filtered (stream
, "@0x%lx",
254 unpack_long (builtin_type_int
, valaddr
));
256 fputs_filtered (": ", stream
);
258 /* De-reference the reference. */
261 if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) != TYPE_CODE_UNDEF
)
265 (TYPE_TARGET_TYPE (type
),
266 unpack_pointer (lookup_pointer_type (builtin_type_void
),
268 val_print (VALUE_TYPE (deref_val
),
269 VALUE_CONTENTS (deref_val
),
270 VALUE_ADDRESS (deref_val
), stream
, format
,
271 deref_ref
, recurse
+ 1, pretty
);
274 fputs_filtered ("???", stream
);
278 case TYPE_CODE_UNION
:
279 if (recurse
&& !unionprint
)
281 fprintf_filtered (stream
, "{...}");
285 case TYPE_CODE_STRUCT
:
286 if (vtblprint
&& cp_is_vtbl_ptr_type(type
))
288 /* Print the unmangled name if desired. */
289 print_address_demangle(*((int *) (valaddr
+ /* FIXME bytesex */
290 TYPE_FIELD_BITPOS (type
, VTBL_FNADDR_OFFSET
) / 8)),
294 cp_print_value_fields (type
, valaddr
, stream
, format
, recurse
, pretty
,
301 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
304 len
= TYPE_NFIELDS (type
);
305 val
= unpack_long (type
, valaddr
);
306 for (i
= 0; i
< len
; i
++)
309 if (val
== TYPE_FIELD_BITPOS (type
, i
))
316 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
320 print_longest (stream
, 'd', 0, val
);
327 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
330 /* FIXME, we should consider, at least for ANSI C language, eliminating
331 the distinction made between FUNCs and POINTERs to FUNCs. */
332 fprintf_filtered (stream
, "{");
333 type_print (type
, "", stream
, -1);
334 fprintf_filtered (stream
, "} ");
335 /* Try to print what function it points to, and its address. */
336 print_address_demangle (address
, stream
, demangle
);
340 /* Do something at least vaguely reasonable, for example if the
341 language is set wrong. */
344 format
= format
? format
: output_format
;
347 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
351 val_print_type_code_int (type
, valaddr
, stream
);
352 /* C and C++ has no single byte int type, char is used instead.
353 Since we don't know whether the value is really intended to
354 be used as an integer or a character, print the character
355 equivalent as well. */
356 if (TYPE_LENGTH (type
) == 1)
358 fputs_filtered (" ", stream
);
359 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
),
366 format
= format
? format
: output_format
;
369 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
373 fprintf_filtered (stream
, TYPE_UNSIGNED (type
) ? "%u" : "%d",
374 unpack_long (type
, valaddr
));
375 fputs_filtered (" ", stream
);
376 LA_PRINT_CHAR ((unsigned char) unpack_long (type
, valaddr
), stream
);
383 print_scalar_formatted (valaddr
, type
, format
, 0, stream
);
387 print_floating (valaddr
, type
, stream
);
392 fprintf_filtered (stream
, "void");
395 case TYPE_CODE_ERROR
:
396 fprintf_filtered (stream
, "<error type>");
399 case TYPE_CODE_RANGE
:
400 /* FIXME, we should not ever have to print one of these yet. */
401 fprintf_filtered (stream
, "<range type>");
404 case TYPE_CODE_UNDEF
:
405 /* This happens (without TYPE_FLAG_STUB set) on systems which don't use
406 dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
407 and no complete type for struct foo in that file. */
408 fprintf_filtered (stream
, "<incomplete type>");
412 error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type
));