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 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"
38 /* For real-type printing in whatis_exp() */
39 extern int objectprint
; /* Controls looking up an object's derived type
40 using what we find in its vtables. */
42 extern void _initialize_typeprint (void);
44 static void ptype_command (char *, int);
46 static void whatis_command (char *, int);
48 static void whatis_exp (char *, int);
50 /* Print a description of a type in the format of a
51 typedef for the current language.
52 NEW is the new name for a type TYPE. */
55 typedef_print (struct type
*type
, struct symbol
*new, struct ui_file
*stream
)
58 switch (current_language
->la_language
)
63 fprintf_filtered (stream
, "typedef ");
64 type_print (type
, "", stream
, 0);
65 if (TYPE_NAME ((SYMBOL_TYPE (new))) == 0
66 || strcmp (TYPE_NAME ((SYMBOL_TYPE (new))), DEPRECATED_SYMBOL_NAME (new)) != 0)
67 fprintf_filtered (stream
, " %s", SYMBOL_PRINT_NAME (new));
72 fprintf_filtered (stream
, "TYPE ");
73 if (!TYPE_NAME (SYMBOL_TYPE (new))
74 || strcmp (TYPE_NAME ((SYMBOL_TYPE (new))), DEPRECATED_SYMBOL_NAME (new)) != 0)
75 fprintf_filtered (stream
, "%s = ", SYMBOL_PRINT_NAME (new));
77 fprintf_filtered (stream
, "<builtin> = ");
78 type_print (type
, "", stream
, 0);
83 fprintf_filtered (stream
, "type ");
84 fprintf_filtered (stream
, "%s = ", SYMBOL_PRINT_NAME (new));
85 type_print (type
, "", stream
, 0);
89 error (_("Language not supported."));
91 fprintf_filtered (stream
, ";\n");
94 /* Print a description of a type TYPE in the form of a declaration of a
95 variable named VARSTRING. (VARSTRING is demangled if necessary.)
96 Output goes to STREAM (via stdio).
97 If SHOW is positive, we show the contents of the outermost level
98 of structure even if there is a type name that could be used instead.
99 If SHOW is negative, we never show the details of elements' types. */
102 type_print (struct type
*type
, char *varstring
, struct ui_file
*stream
,
105 LA_PRINT_TYPE (type
, varstring
, stream
, show
, 0);
108 /* Print type of EXP, or last thing in value history if EXP == NULL.
109 show is passed to type_print. */
112 whatis_exp (char *exp
, int show
)
114 struct expression
*expr
;
116 struct cleanup
*old_chain
= NULL
;
117 struct type
*real_type
= NULL
;
125 expr
= parse_expression (exp
);
126 old_chain
= make_cleanup (free_current_contents
, &expr
);
127 val
= evaluate_type (expr
);
130 val
= access_value_history (0);
132 type
= value_type (val
);
136 if (((TYPE_CODE (type
) == TYPE_CODE_PTR
) ||
137 (TYPE_CODE (type
) == TYPE_CODE_REF
))
139 (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_CLASS
))
141 real_type
= value_rtti_target_type (val
, &full
, &top
, &using_enc
);
144 if (TYPE_CODE (type
) == TYPE_CODE_PTR
)
145 real_type
= lookup_pointer_type (real_type
);
147 real_type
= lookup_reference_type (real_type
);
150 else if (TYPE_CODE (type
) == TYPE_CODE_CLASS
)
151 real_type
= value_rtti_type (val
, &full
, &top
, &using_enc
);
154 printf_filtered ("type = ");
158 printf_filtered ("/* real type = ");
159 type_print (real_type
, "", gdb_stdout
, -1);
161 printf_filtered (" (incomplete object)");
162 printf_filtered (" */\n");
165 type_print (type
, "", gdb_stdout
, show
);
166 printf_filtered ("\n");
169 do_cleanups (old_chain
);
173 whatis_command (char *exp
, int from_tty
)
175 /* Most of the time users do not want to see all the fields
176 in a structure. If they do they can use the "ptype" command.
177 Hence the "-1" below. */
178 whatis_exp (exp
, -1);
181 /* TYPENAME is either the name of a type, or an expression. */
184 ptype_command (char *typename
, int from_tty
)
186 whatis_exp (typename
, 1);
189 /* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM.
190 Used to print data from type structures in a specified type. For example,
191 array bounds may be characters or booleans in some languages, and this
192 allows the ranges to be printed in their "natural" form rather than as
193 decimal integer values.
195 FIXME: This is here simply because only the type printing routines
196 currently use it, and it wasn't clear if it really belonged somewhere
197 else (like printcmd.c). There are a lot of other gdb routines that do
198 something similar, but they are generally concerned with printing values
199 that come from the inferior in target byte order and target size. */
202 print_type_scalar (struct type
*type
, LONGEST val
, struct ui_file
*stream
)
207 CHECK_TYPEDEF (type
);
209 switch (TYPE_CODE (type
))
213 len
= TYPE_NFIELDS (type
);
214 for (i
= 0; i
< len
; i
++)
216 if (TYPE_FIELD_BITPOS (type
, i
) == val
)
223 fputs_filtered (TYPE_FIELD_NAME (type
, i
), stream
);
227 print_longest (stream
, 'd', 0, val
);
232 print_longest (stream
, TYPE_UNSIGNED (type
) ? 'u' : 'd', 0, val
);
236 LA_PRINT_CHAR ((unsigned char) val
, stream
);
240 fprintf_filtered (stream
, val
? "TRUE" : "FALSE");
243 case TYPE_CODE_RANGE
:
244 print_type_scalar (TYPE_TARGET_TYPE (type
), val
, stream
);
247 case TYPE_CODE_UNDEF
:
249 case TYPE_CODE_ARRAY
:
250 case TYPE_CODE_STRUCT
:
251 case TYPE_CODE_UNION
:
256 case TYPE_CODE_STRING
:
257 case TYPE_CODE_ERROR
:
258 case TYPE_CODE_MEMBERPTR
:
259 case TYPE_CODE_METHODPTR
:
260 case TYPE_CODE_METHOD
:
262 case TYPE_CODE_NAMESPACE
:
263 error (_("internal error: unhandled type in print_type_scalar"));
267 error (_("Invalid type code in symbol table."));
272 /* Dump details of a type specified either directly or indirectly.
273 Uses the same sort of type lookup mechanism as ptype_command()
274 and whatis_command(). */
277 maintenance_print_type (char *typename
, int from_tty
)
281 struct cleanup
*old_chain
;
282 struct expression
*expr
;
284 if (typename
!= NULL
)
286 expr
= parse_expression (typename
);
287 old_chain
= make_cleanup (free_current_contents
, &expr
);
288 if (expr
->elts
[0].opcode
== OP_TYPE
)
290 /* The user expression names a type directly, just use that type. */
291 type
= expr
->elts
[1].type
;
295 /* The user expression may name a type indirectly by naming an
296 object of that type. Find that indirectly named type. */
297 val
= evaluate_type (expr
);
298 type
= value_type (val
);
302 recursive_dump_type (type
, 0);
304 do_cleanups (old_chain
);
310 _initialize_typeprint (void)
313 add_com ("ptype", class_vars
, ptype_command
, _("\
314 Print definition of type TYPE.\n\
315 Argument may be a type name defined by typedef, or \"struct STRUCT-TAG\"\n\
316 or \"class CLASS-NAME\" or \"union UNION-TAG\" or \"enum ENUM-TAG\".\n\
317 The selected stack frame's lexical context is used to look up the name."));
319 add_com ("whatis", class_vars
, whatis_command
,
320 _("Print data type of expression EXP."));