1 /* Language independent support for printing types for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1991, 1992, 1993 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #include "bfd.h" /* Binary File Description */
25 #include "expression.h"
34 #include "gdb_string.h"
38 ptype_command
PARAMS ((char *, int));
41 ptype_eval
PARAMS ((struct expression
*));
44 whatis_command
PARAMS ((char *, int));
47 whatis_exp
PARAMS ((char *, int));
49 /* Print a description of a type TYPE in the form of a declaration of a
50 variable named VARSTRING. (VARSTRING is demangled if necessary.)
51 Output goes to STREAM (via stdio).
52 If SHOW is positive, we show the contents of the outermost level
53 of structure even if there is a type name that could be used instead.
54 If SHOW is negative, we never show the details of elements' types. */
57 type_print (type
, varstring
, stream
, show
)
63 LA_PRINT_TYPE (type
, varstring
, stream
, show
, 0);
66 /* Print type of EXP, or last thing in value history if EXP == NULL.
67 show is passed to type_print. */
70 whatis_exp (exp
, show
)
74 struct expression
*expr
;
75 register value_ptr val
;
76 register struct cleanup
*old_chain
= NULL
;
80 expr
= parse_expression (exp
);
81 old_chain
= make_cleanup (free_current_contents
, &expr
);
82 val
= evaluate_type (expr
);
85 val
= access_value_history (0);
87 printf_filtered ("type = ");
88 type_print (VALUE_TYPE (val
), "", gdb_stdout
, show
);
89 printf_filtered ("\n");
92 do_cleanups (old_chain
);
97 whatis_command (exp
, from_tty
)
101 /* Most of the time users do not want to see all the fields
102 in a structure. If they do they can use the "ptype" command.
103 Hence the "-1" below. */
104 whatis_exp (exp
, -1);
107 /* Simple subroutine for ptype_command. */
111 struct expression
*exp
;
113 if (exp
->elts
[0].opcode
== OP_TYPE
)
115 return (exp
->elts
[1].type
);
123 /* TYPENAME is either the name of a type, or an expression. */
127 ptype_command (typename
, from_tty
)
131 register struct type
*type
;
132 struct expression
*expr
;
133 register struct cleanup
*old_chain
;
135 if (typename
== NULL
)
137 /* Print type of last thing in value history. */
138 whatis_exp (typename
, 1);
142 expr
= parse_expression (typename
);
143 old_chain
= make_cleanup (free_current_contents
, &expr
);
144 type
= ptype_eval (expr
);
147 /* User did "ptype <typename>" */
148 printf_filtered ("type = ");
149 type_print (type
, "", gdb_stdout
, 1);
150 printf_filtered ("\n");
151 do_cleanups (old_chain
);
155 /* User did "ptype <symbolname>" */
156 do_cleanups (old_chain
);
157 whatis_exp (typename
, 1);
162 /* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM.
163 Used to print data from type structures in a specified type. For example,
164 array bounds may be characters or booleans in some languages, and this
165 allows the ranges to be printed in their "natural" form rather than as
166 decimal integer values.
168 FIXME: This is here simply because only the type printing routines
169 currently use it, and it wasn't clear if it really belonged somewhere
170 else (like printcmd.c). There are a lot of other gdb routines that do
171 something similar, but they are generally concerned with printing values
172 that come from the inferior in target byte order and target size. */
175 print_type_scalar (type
, val
, stream
)
183 CHECK_TYPEDEF (type
);
185 switch (TYPE_CODE (type
))
189 len
= TYPE_NFIELDS (type
);
190 for (i
= 0; i
< len
; i
++)
192 if (TYPE_FIELD_BITPOS (type
, i
) == val
)
199 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
203 print_longest (stream
, 'd', 0, val
);
208 print_longest (stream
, TYPE_UNSIGNED (type
) ? 'u' : 'd', 0, val
);
212 LA_PRINT_CHAR ((unsigned char) val
, stream
);
216 fprintf_filtered (stream
, val
? "TRUE" : "FALSE");
219 case TYPE_CODE_RANGE
:
220 print_type_scalar (TYPE_TARGET_TYPE (type
), val
, stream
);
223 case TYPE_CODE_UNDEF
:
225 case TYPE_CODE_ARRAY
:
226 case TYPE_CODE_STRUCT
:
227 case TYPE_CODE_UNION
:
232 case TYPE_CODE_STRING
:
233 case TYPE_CODE_ERROR
:
234 case TYPE_CODE_MEMBER
:
235 case TYPE_CODE_METHOD
:
237 error ("internal error: unhandled type in print_type_scalar");
241 error ("Invalid type code in symbol table.");
248 /* Dump details of a type specified either directly or indirectly.
249 Uses the same sort of type lookup mechanism as ptype_command()
250 and whatis_command(). */
253 maintenance_print_type (typename
, from_tty
)
257 register value_ptr val
;
258 register struct type
*type
;
259 register struct cleanup
*old_chain
;
260 struct expression
*expr
;
262 if (typename
!= NULL
)
264 expr
= parse_expression (typename
);
265 old_chain
= make_cleanup (free_current_contents
, &expr
);
266 if (expr
-> elts
[0].opcode
== OP_TYPE
)
268 /* The user expression names a type directly, just use that type. */
269 type
= expr
-> elts
[1].type
;
273 /* The user expression may name a type indirectly by naming an
274 object of that type. Find that indirectly named type. */
275 val
= evaluate_type (expr
);
276 type
= VALUE_TYPE (val
);
280 recursive_dump_type (type
, 0);
282 do_cleanups (old_chain
);
286 #endif /* MAINTENANCE_CMDS */
290 _initialize_typeprint ()
293 add_com ("ptype", class_vars
, ptype_command
,
294 "Print definition of type TYPE.\n\
295 Argument may be a type name defined by typedef, or \"struct STRUCT-TAG\"\n\
296 or \"class CLASS-NAME\" or \"union UNION-TAG\" or \"enum ENUM-TAG\".\n\
297 The selected stack frame's lexical context is used to look up the name.");
299 add_com ("whatis", class_vars
, whatis_command
,
300 "Print data type of expression EXP.");
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