Commit | Line | Data |
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a8a69e63 | 1 | /* Language independent support for printing types for GDB, the GNU debugger. |
ad3b8c4a | 2 | Copyright 1986, 88, 89, 91, 92, 93, 1998 Free Software Foundation, Inc. |
a8a69e63 FF |
3 | |
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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 | |
6c9638b4 | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
a8a69e63 FF |
19 | |
20 | #include "defs.h" | |
21 | #include "obstack.h" | |
22 | #include "bfd.h" /* Binary File Description */ | |
23 | #include "symtab.h" | |
24 | #include "gdbtypes.h" | |
25 | #include "expression.h" | |
26 | #include "value.h" | |
27 | #include "gdbcore.h" | |
28 | #include "command.h" | |
29 | #include "gdbcmd.h" | |
30 | #include "target.h" | |
31 | #include "language.h" | |
32 | #include "demangle.h" | |
33 | ||
2b576293 | 34 | #include "gdb_string.h" |
a8a69e63 FF |
35 | #include <errno.h> |
36 | ||
65b07ddc DT |
37 | /* For real-type printing in whatis_exp() */ |
38 | extern int objectprint; /* Controls looking up an object's derived type | |
39 | using what we find in its vtables. */ | |
40 | ||
a8a69e63 FF |
41 | static void |
42 | ptype_command PARAMS ((char *, int)); | |
43 | ||
44 | static struct type * | |
45 | ptype_eval PARAMS ((struct expression *)); | |
46 | ||
47 | static void | |
48 | whatis_command PARAMS ((char *, int)); | |
49 | ||
50 | static void | |
51 | whatis_exp PARAMS ((char *, int)); | |
52 | ||
53 | /* Print a description of a type TYPE in the form of a declaration of a | |
54 | variable named VARSTRING. (VARSTRING is demangled if necessary.) | |
55 | Output goes to STREAM (via stdio). | |
56 | If SHOW is positive, we show the contents of the outermost level | |
57 | of structure even if there is a type name that could be used instead. | |
58 | If SHOW is negative, we never show the details of elements' types. */ | |
59 | ||
60 | void | |
61 | type_print (type, varstring, stream, show) | |
62 | struct type *type; | |
63 | char *varstring; | |
199b2450 | 64 | GDB_FILE *stream; |
a8a69e63 FF |
65 | int show; |
66 | { | |
67 | LA_PRINT_TYPE (type, varstring, stream, show, 0); | |
68 | } | |
69 | ||
70 | /* Print type of EXP, or last thing in value history if EXP == NULL. | |
71 | show is passed to type_print. */ | |
72 | ||
73 | static void | |
74 | whatis_exp (exp, show) | |
75 | char *exp; | |
76 | int show; | |
77 | { | |
78 | struct expression *expr; | |
82a2edfb | 79 | register value_ptr val; |
46c28185 | 80 | register struct cleanup *old_chain = NULL; |
65b07ddc DT |
81 | struct type * real_type = NULL; |
82 | int full = 0; | |
83 | int top = -1; | |
84 | int using_enc = 0; | |
a8a69e63 FF |
85 | |
86 | if (exp) | |
87 | { | |
88 | expr = parse_expression (exp); | |
ad3b8c4a JM |
89 | old_chain = make_cleanup ((make_cleanup_func) free_current_contents, |
90 | &expr); | |
a8a69e63 FF |
91 | val = evaluate_type (expr); |
92 | } | |
93 | else | |
94 | val = access_value_history (0); | |
95 | ||
65b07ddc DT |
96 | real_type = value_rtti_type (val, &full, &top, &using_enc); |
97 | ||
a8a69e63 | 98 | printf_filtered ("type = "); |
65b07ddc DT |
99 | |
100 | if (real_type && objectprint) | |
101 | printf_filtered ("/* real type = %s%s */\n", | |
102 | TYPE_NAME (real_type), | |
103 | full ? "" : " (incomplete object)"); | |
104 | /* FIXME: maybe better to use type_print (real_type, "", gdb_stdout, -1); */ | |
105 | ||
199b2450 | 106 | type_print (VALUE_TYPE (val), "", gdb_stdout, show); |
a8a69e63 FF |
107 | printf_filtered ("\n"); |
108 | ||
109 | if (exp) | |
110 | do_cleanups (old_chain); | |
111 | } | |
112 | ||
113 | /* ARGSUSED */ | |
114 | static void | |
115 | whatis_command (exp, from_tty) | |
116 | char *exp; | |
117 | int from_tty; | |
118 | { | |
119 | /* Most of the time users do not want to see all the fields | |
120 | in a structure. If they do they can use the "ptype" command. | |
121 | Hence the "-1" below. */ | |
122 | whatis_exp (exp, -1); | |
123 | } | |
124 | ||
125 | /* Simple subroutine for ptype_command. */ | |
126 | ||
127 | static struct type * | |
128 | ptype_eval (exp) | |
129 | struct expression *exp; | |
130 | { | |
131 | if (exp->elts[0].opcode == OP_TYPE) | |
132 | { | |
133 | return (exp->elts[1].type); | |
134 | } | |
135 | else | |
136 | { | |
137 | return (NULL); | |
138 | } | |
139 | } | |
140 | ||
141 | /* TYPENAME is either the name of a type, or an expression. */ | |
142 | ||
143 | /* ARGSUSED */ | |
144 | static void | |
145 | ptype_command (typename, from_tty) | |
146 | char *typename; | |
147 | int from_tty; | |
148 | { | |
149 | register struct type *type; | |
150 | struct expression *expr; | |
151 | register struct cleanup *old_chain; | |
152 | ||
153 | if (typename == NULL) | |
154 | { | |
155 | /* Print type of last thing in value history. */ | |
156 | whatis_exp (typename, 1); | |
157 | } | |
158 | else | |
159 | { | |
160 | expr = parse_expression (typename); | |
ad3b8c4a JM |
161 | old_chain = make_cleanup ((make_cleanup_func) free_current_contents, |
162 | &expr); | |
a8a69e63 FF |
163 | type = ptype_eval (expr); |
164 | if (type != NULL) | |
165 | { | |
166 | /* User did "ptype <typename>" */ | |
167 | printf_filtered ("type = "); | |
199b2450 | 168 | type_print (type, "", gdb_stdout, 1); |
a8a69e63 FF |
169 | printf_filtered ("\n"); |
170 | do_cleanups (old_chain); | |
171 | } | |
172 | else | |
173 | { | |
174 | /* User did "ptype <symbolname>" */ | |
175 | do_cleanups (old_chain); | |
176 | whatis_exp (typename, 1); | |
177 | } | |
178 | } | |
179 | } | |
180 | ||
181 | /* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM. | |
182 | Used to print data from type structures in a specified type. For example, | |
183 | array bounds may be characters or booleans in some languages, and this | |
184 | allows the ranges to be printed in their "natural" form rather than as | |
185 | decimal integer values. | |
186 | ||
187 | FIXME: This is here simply because only the type printing routines | |
188 | currently use it, and it wasn't clear if it really belonged somewhere | |
189 | else (like printcmd.c). There are a lot of other gdb routines that do | |
190 | something similar, but they are generally concerned with printing values | |
191 | that come from the inferior in target byte order and target size. */ | |
192 | ||
193 | void | |
194 | print_type_scalar (type, val, stream) | |
195 | struct type *type; | |
196 | LONGEST val; | |
199b2450 | 197 | GDB_FILE *stream; |
a8a69e63 FF |
198 | { |
199 | unsigned int i; | |
200 | unsigned len; | |
201 | ||
bcbf388e PB |
202 | CHECK_TYPEDEF (type); |
203 | ||
a8a69e63 FF |
204 | switch (TYPE_CODE (type)) |
205 | { | |
206 | ||
207 | case TYPE_CODE_ENUM: | |
208 | len = TYPE_NFIELDS (type); | |
209 | for (i = 0; i < len; i++) | |
210 | { | |
211 | if (TYPE_FIELD_BITPOS (type, i) == val) | |
212 | { | |
213 | break; | |
214 | } | |
215 | } | |
216 | if (i < len) | |
217 | { | |
218 | fputs_filtered (TYPE_FIELD_NAME (type, i), stream); | |
219 | } | |
220 | else | |
221 | { | |
7efb57c3 | 222 | print_longest (stream, 'd', 0, val); |
a8a69e63 FF |
223 | } |
224 | break; | |
225 | ||
226 | case TYPE_CODE_INT: | |
7efb57c3 | 227 | print_longest (stream, TYPE_UNSIGNED (type) ? 'u' : 'd', 0, val); |
a8a69e63 FF |
228 | break; |
229 | ||
230 | case TYPE_CODE_CHAR: | |
231 | LA_PRINT_CHAR ((unsigned char) val, stream); | |
232 | break; | |
233 | ||
234 | case TYPE_CODE_BOOL: | |
235 | fprintf_filtered (stream, val ? "TRUE" : "FALSE"); | |
236 | break; | |
237 | ||
bcbf388e PB |
238 | case TYPE_CODE_RANGE: |
239 | print_type_scalar (TYPE_TARGET_TYPE (type), val, stream); | |
240 | return; | |
241 | ||
a8a69e63 FF |
242 | case TYPE_CODE_UNDEF: |
243 | case TYPE_CODE_PTR: | |
244 | case TYPE_CODE_ARRAY: | |
245 | case TYPE_CODE_STRUCT: | |
246 | case TYPE_CODE_UNION: | |
247 | case TYPE_CODE_FUNC: | |
248 | case TYPE_CODE_FLT: | |
249 | case TYPE_CODE_VOID: | |
250 | case TYPE_CODE_SET: | |
c4413e2c | 251 | case TYPE_CODE_STRING: |
a8a69e63 FF |
252 | case TYPE_CODE_ERROR: |
253 | case TYPE_CODE_MEMBER: | |
254 | case TYPE_CODE_METHOD: | |
255 | case TYPE_CODE_REF: | |
256 | error ("internal error: unhandled type in print_type_scalar"); | |
257 | break; | |
258 | ||
259 | default: | |
260 | error ("Invalid type code in symbol table."); | |
261 | } | |
199b2450 | 262 | gdb_flush (stream); |
a8a69e63 FF |
263 | } |
264 | ||
265 | #if MAINTENANCE_CMDS | |
266 | ||
267 | /* Dump details of a type specified either directly or indirectly. | |
268 | Uses the same sort of type lookup mechanism as ptype_command() | |
269 | and whatis_command(). */ | |
270 | ||
271 | void | |
272 | maintenance_print_type (typename, from_tty) | |
273 | char *typename; | |
274 | int from_tty; | |
275 | { | |
82a2edfb | 276 | register value_ptr val; |
a8a69e63 FF |
277 | register struct type *type; |
278 | register struct cleanup *old_chain; | |
279 | struct expression *expr; | |
280 | ||
281 | if (typename != NULL) | |
282 | { | |
283 | expr = parse_expression (typename); | |
ad3b8c4a | 284 | old_chain = make_cleanup ((make_cleanup_func) free_current_contents, &expr); |
a8a69e63 FF |
285 | if (expr -> elts[0].opcode == OP_TYPE) |
286 | { | |
287 | /* The user expression names a type directly, just use that type. */ | |
288 | type = expr -> elts[1].type; | |
289 | } | |
290 | else | |
291 | { | |
292 | /* The user expression may name a type indirectly by naming an | |
293 | object of that type. Find that indirectly named type. */ | |
294 | val = evaluate_type (expr); | |
295 | type = VALUE_TYPE (val); | |
296 | } | |
297 | if (type != NULL) | |
298 | { | |
299 | recursive_dump_type (type, 0); | |
300 | } | |
301 | do_cleanups (old_chain); | |
302 | } | |
303 | } | |
304 | ||
305 | #endif /* MAINTENANCE_CMDS */ | |
306 | ||
307 | \f | |
308 | void | |
309 | _initialize_typeprint () | |
310 | { | |
311 | ||
312 | add_com ("ptype", class_vars, ptype_command, | |
313 | "Print definition of type TYPE.\n\ | |
915e6cd9 JK |
314 | Argument may be a type name defined by typedef, or \"struct STRUCT-TAG\"\n\ |
315 | or \"class CLASS-NAME\" or \"union UNION-TAG\" or \"enum ENUM-TAG\".\n\ | |
a8a69e63 FF |
316 | The selected stack frame's lexical context is used to look up the name."); |
317 | ||
318 | add_com ("whatis", class_vars, whatis_command, | |
319 | "Print data type of expression EXP."); | |
320 | ||
321 | } |