1 /* Language independent support for printing types for GDB, the GNU debugger.
3 Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1998, 1999,
4 2000, 2001, 2003, 2006, 2007, 2008, 2009 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 3 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, see <http://www.gnu.org/licenses/>. */
22 #include "gdb_obstack.h"
23 #include "bfd.h" /* Binary File Description */
26 #include "expression.h"
34 #include "typeprint.h"
35 #include "gdb_string.h"
39 extern void _initialize_typeprint (void);
41 static void ptype_command (char *, int);
43 static void whatis_command (char *, int);
45 static void whatis_exp (char *, int);
48 /* Print a description of a type in the format of a
49 typedef for the current language.
50 NEW is the new name for a type TYPE. */
53 typedef_print (struct type
*type
, struct symbol
*new, struct ui_file
*stream
)
55 LA_PRINT_TYPEDEF (type
, new, stream
);
58 /* The default way to print a typedef. */
61 default_print_typedef (struct type
*type
, struct symbol
*new_symbol
,
62 struct ui_file
*stream
)
64 error (_("Language not supported."));
67 /* Print a description of a type TYPE in the form of a declaration of a
68 variable named VARSTRING. (VARSTRING is demangled if necessary.)
69 Output goes to STREAM (via stdio).
70 If SHOW is positive, we show the contents of the outermost level
71 of structure even if there is a type name that could be used instead.
72 If SHOW is negative, we never show the details of elements' types. */
75 type_print (struct type
*type
, char *varstring
, struct ui_file
*stream
,
78 LA_PRINT_TYPE (type
, varstring
, stream
, show
, 0);
81 /* Print type of EXP, or last thing in value history if EXP == NULL.
82 show is passed to type_print. */
85 whatis_exp (char *exp
, int show
)
87 struct expression
*expr
;
89 struct cleanup
*old_chain
= NULL
;
90 struct type
*real_type
= NULL
;
95 struct value_print_options opts
;
99 expr
= parse_expression (exp
);
100 old_chain
= make_cleanup (free_current_contents
, &expr
);
101 val
= evaluate_type (expr
);
104 val
= access_value_history (0);
106 type
= value_type (val
);
108 get_user_print_options (&opts
);
109 if (opts
.objectprint
)
111 if (((TYPE_CODE (type
) == TYPE_CODE_PTR
)
112 || (TYPE_CODE (type
) == TYPE_CODE_REF
))
113 && (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
115 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
118 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
119 real_type
= lookup_pointer_type (real_type
);
121 real_type
= lookup_reference_type (real_type
);
124 else if (TYPE_CODE (type
) == TYPE_CODE_CLASS
)
125 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
128 printf_filtered ("type = ");
132 printf_filtered ("/* real type = ");
133 type_print (real_type
, "", gdb_stdout
, -1);
135 printf_filtered (" (incomplete object)");
136 printf_filtered (" */\n");
139 type_print (type
, "", gdb_stdout
, show
);
140 printf_filtered ("\n");
143 do_cleanups (old_chain
);
147 whatis_command (char *exp
, int from_tty
)
149 /* Most of the time users do not want to see all the fields
150 in a structure. If they do they can use the "ptype" command.
151 Hence the "-1" below. */
152 whatis_exp (exp
, -1);
155 /* TYPENAME is either the name of a type, or an expression. */
158 ptype_command (char *typename
, int from_tty
)
160 whatis_exp (typename
, 1);
163 /* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM.
164 Used to print data from type structures in a specified type. For example,
165 array bounds may be characters or booleans in some languages, and this
166 allows the ranges to be printed in their "natural" form rather than as
167 decimal integer values.
169 FIXME: This is here simply because only the type printing routines
170 currently use it, and it wasn't clear if it really belonged somewhere
171 else (like printcmd.c). There are a lot of other gdb routines that do
172 something similar, but they are generally concerned with printing values
173 that come from the inferior in target byte order and target size. */
176 print_type_scalar (struct type
*type
, LONGEST val
, struct ui_file
*stream
)
181 CHECK_TYPEDEF (type
);
183 switch (TYPE_CODE (type
))
187 len
= TYPE_NFIELDS (type
);
188 for (i
= 0; i
< len
; i
++)
190 if (TYPE_FIELD_BITPOS (type
, i
) == val
)
197 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
201 print_longest (stream
, 'd', 0, val
);
206 print_longest (stream
, TYPE_UNSIGNED (type
) ? 'u' : 'd', 0, val
);
210 LA_PRINT_CHAR ((unsigned char) val
, stream
);
214 fprintf_filtered (stream
, val
? "TRUE" : "FALSE");
217 case TYPE_CODE_RANGE
:
218 print_type_scalar (TYPE_TARGET_TYPE (type
), val
, stream
);
221 case TYPE_CODE_UNDEF
:
223 case TYPE_CODE_ARRAY
:
224 case TYPE_CODE_STRUCT
:
225 case TYPE_CODE_UNION
:
230 case TYPE_CODE_STRING
:
231 case TYPE_CODE_ERROR
:
232 case TYPE_CODE_MEMBERPTR
:
233 case TYPE_CODE_METHODPTR
:
234 case TYPE_CODE_METHOD
:
236 case TYPE_CODE_NAMESPACE
:
237 error (_("internal error: unhandled type in print_type_scalar"));
241 error (_("Invalid type code in symbol table."));
246 /* Dump details of a type specified either directly or indirectly.
247 Uses the same sort of type lookup mechanism as ptype_command()
248 and whatis_command(). */
251 maintenance_print_type (char *typename
, int from_tty
)
255 struct cleanup
*old_chain
;
256 struct expression
*expr
;
258 if (typename
!= NULL
)
260 expr
= parse_expression (typename
);
261 old_chain
= make_cleanup (free_current_contents
, &expr
);
262 if (expr
->elts
[0].opcode
== OP_TYPE
)
264 /* The user expression names a type directly, just use that type. */
265 type
= expr
->elts
[1].type
;
269 /* The user expression may name a type indirectly by naming an
270 object of that type. Find that indirectly named type. */
271 val
= evaluate_type (expr
);
272 type
= value_type (val
);
276 recursive_dump_type (type
, 0);
278 do_cleanups (old_chain
);
284 _initialize_typeprint (void)
286 add_com ("ptype", class_vars
, ptype_command
, _("\
287 Print definition of type TYPE.\n\
288 Argument may be a type name defined by typedef, or \"struct STRUCT-TAG\"\n\
289 or \"class CLASS-NAME\" or \"union UNION-TAG\" or \"enum ENUM-TAG\".\n\
290 The selected stack frame's lexical context is used to look up the name."));
292 add_com ("whatis", class_vars
, whatis_command
,
293 _("Print data type of expression EXP."));
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