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c906108c SS |
1 | /* Language independent support for printing types for GDB, the GNU debugger. |
2 | Copyright 1986, 88, 89, 91, 92, 93, 1998 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "obstack.h" | |
23 | #include "bfd.h" /* Binary File Description */ | |
24 | #include "symtab.h" | |
25 | #include "gdbtypes.h" | |
26 | #include "expression.h" | |
27 | #include "value.h" | |
28 | #include "gdbcore.h" | |
29 | #include "command.h" | |
30 | #include "gdbcmd.h" | |
31 | #include "target.h" | |
32 | #include "language.h" | |
33 | #include "demangle.h" | |
34 | ||
35 | #include "gdb_string.h" | |
36 | #include <errno.h> | |
37 | ||
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. */ | |
41 | ||
392a587b JM |
42 | extern void _initialize_typeprint PARAMS ((void)); |
43 | ||
c906108c SS |
44 | static void |
45 | ptype_command PARAMS ((char *, int)); | |
46 | ||
47 | static struct type * | |
c5aa993b | 48 | ptype_eval PARAMS ((struct expression *)); |
c906108c SS |
49 | |
50 | static void | |
51 | whatis_command PARAMS ((char *, int)); | |
52 | ||
53 | static void | |
54 | whatis_exp PARAMS ((char *, int)); | |
55 | ||
56 | /* Print a description of a type TYPE in the form of a declaration of a | |
57 | variable named VARSTRING. (VARSTRING is demangled if necessary.) | |
58 | Output goes to STREAM (via stdio). | |
59 | If SHOW is positive, we show the contents of the outermost level | |
60 | of structure even if there is a type name that could be used instead. | |
61 | If SHOW is negative, we never show the details of elements' types. */ | |
62 | ||
63 | void | |
64 | type_print (type, varstring, stream, show) | |
65 | struct type *type; | |
66 | char *varstring; | |
67 | GDB_FILE *stream; | |
68 | int show; | |
69 | { | |
70 | LA_PRINT_TYPE (type, varstring, stream, show, 0); | |
71 | } | |
72 | ||
73 | /* Print type of EXP, or last thing in value history if EXP == NULL. | |
74 | show is passed to type_print. */ | |
75 | ||
76 | static void | |
77 | whatis_exp (exp, show) | |
78 | char *exp; | |
79 | int show; | |
80 | { | |
81 | struct expression *expr; | |
82 | register value_ptr val; | |
83 | register struct cleanup *old_chain = NULL; | |
c5aa993b | 84 | struct type *real_type = NULL; |
c906108c SS |
85 | int full = 0; |
86 | int top = -1; | |
87 | int using_enc = 0; | |
88 | ||
89 | if (exp) | |
90 | { | |
91 | expr = parse_expression (exp); | |
c5aa993b JM |
92 | old_chain = make_cleanup ((make_cleanup_func) free_current_contents, |
93 | &expr); | |
c906108c SS |
94 | val = evaluate_type (expr); |
95 | } | |
96 | else | |
97 | val = access_value_history (0); | |
98 | ||
99 | real_type = value_rtti_type (val, &full, &top, &using_enc); | |
100 | ||
101 | printf_filtered ("type = "); | |
102 | ||
103 | if (real_type && objectprint) | |
104 | printf_filtered ("/* real type = %s%s */\n", | |
c5aa993b JM |
105 | TYPE_NAME (real_type), |
106 | full ? "" : " (incomplete object)"); | |
c906108c SS |
107 | /* FIXME: maybe better to use type_print (real_type, "", gdb_stdout, -1); */ |
108 | ||
109 | type_print (VALUE_TYPE (val), "", gdb_stdout, show); | |
110 | printf_filtered ("\n"); | |
111 | ||
112 | if (exp) | |
113 | do_cleanups (old_chain); | |
114 | } | |
115 | ||
116 | /* ARGSUSED */ | |
117 | static void | |
118 | whatis_command (exp, from_tty) | |
119 | char *exp; | |
120 | int from_tty; | |
121 | { | |
122 | /* Most of the time users do not want to see all the fields | |
123 | in a structure. If they do they can use the "ptype" command. | |
124 | Hence the "-1" below. */ | |
125 | whatis_exp (exp, -1); | |
126 | } | |
127 | ||
128 | /* Simple subroutine for ptype_command. */ | |
129 | ||
130 | static struct type * | |
131 | ptype_eval (exp) | |
132 | struct expression *exp; | |
133 | { | |
134 | if (exp->elts[0].opcode == OP_TYPE) | |
135 | { | |
136 | return (exp->elts[1].type); | |
137 | } | |
138 | else | |
139 | { | |
140 | return (NULL); | |
141 | } | |
142 | } | |
143 | ||
144 | /* TYPENAME is either the name of a type, or an expression. */ | |
145 | ||
146 | /* ARGSUSED */ | |
147 | static void | |
148 | ptype_command (typename, from_tty) | |
149 | char *typename; | |
150 | int from_tty; | |
151 | { | |
152 | register struct type *type; | |
153 | struct expression *expr; | |
154 | register struct cleanup *old_chain; | |
155 | ||
156 | if (typename == NULL) | |
157 | { | |
158 | /* Print type of last thing in value history. */ | |
159 | whatis_exp (typename, 1); | |
160 | } | |
161 | else | |
162 | { | |
163 | expr = parse_expression (typename); | |
c5aa993b JM |
164 | old_chain = make_cleanup ((make_cleanup_func) free_current_contents, |
165 | &expr); | |
c906108c SS |
166 | type = ptype_eval (expr); |
167 | if (type != NULL) | |
168 | { | |
169 | /* User did "ptype <typename>" */ | |
170 | printf_filtered ("type = "); | |
171 | type_print (type, "", gdb_stdout, 1); | |
172 | printf_filtered ("\n"); | |
173 | do_cleanups (old_chain); | |
174 | } | |
175 | else | |
176 | { | |
177 | /* User did "ptype <symbolname>" */ | |
178 | do_cleanups (old_chain); | |
179 | whatis_exp (typename, 1); | |
180 | } | |
181 | } | |
182 | } | |
183 | ||
184 | /* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM. | |
185 | Used to print data from type structures in a specified type. For example, | |
186 | array bounds may be characters or booleans in some languages, and this | |
187 | allows the ranges to be printed in their "natural" form rather than as | |
188 | decimal integer values. | |
189 | ||
190 | FIXME: This is here simply because only the type printing routines | |
191 | currently use it, and it wasn't clear if it really belonged somewhere | |
192 | else (like printcmd.c). There are a lot of other gdb routines that do | |
193 | something similar, but they are generally concerned with printing values | |
194 | that come from the inferior in target byte order and target size. */ | |
195 | ||
196 | void | |
197 | print_type_scalar (type, val, stream) | |
198 | struct type *type; | |
199 | LONGEST val; | |
200 | GDB_FILE *stream; | |
201 | { | |
202 | unsigned int i; | |
203 | unsigned len; | |
204 | ||
205 | CHECK_TYPEDEF (type); | |
206 | ||
207 | switch (TYPE_CODE (type)) | |
208 | { | |
209 | ||
210 | case TYPE_CODE_ENUM: | |
211 | len = TYPE_NFIELDS (type); | |
212 | for (i = 0; i < len; i++) | |
213 | { | |
214 | if (TYPE_FIELD_BITPOS (type, i) == val) | |
215 | { | |
216 | break; | |
217 | } | |
218 | } | |
219 | if (i < len) | |
220 | { | |
221 | fputs_filtered (TYPE_FIELD_NAME (type, i), stream); | |
222 | } | |
223 | else | |
224 | { | |
225 | print_longest (stream, 'd', 0, val); | |
226 | } | |
227 | break; | |
228 | ||
229 | case TYPE_CODE_INT: | |
230 | print_longest (stream, TYPE_UNSIGNED (type) ? 'u' : 'd', 0, val); | |
231 | break; | |
232 | ||
233 | case TYPE_CODE_CHAR: | |
234 | LA_PRINT_CHAR ((unsigned char) val, stream); | |
235 | break; | |
236 | ||
237 | case TYPE_CODE_BOOL: | |
238 | fprintf_filtered (stream, val ? "TRUE" : "FALSE"); | |
239 | break; | |
240 | ||
241 | case TYPE_CODE_RANGE: | |
242 | print_type_scalar (TYPE_TARGET_TYPE (type), val, stream); | |
243 | return; | |
244 | ||
245 | case TYPE_CODE_UNDEF: | |
246 | case TYPE_CODE_PTR: | |
247 | case TYPE_CODE_ARRAY: | |
248 | case TYPE_CODE_STRUCT: | |
249 | case TYPE_CODE_UNION: | |
250 | case TYPE_CODE_FUNC: | |
251 | case TYPE_CODE_FLT: | |
252 | case TYPE_CODE_VOID: | |
253 | case TYPE_CODE_SET: | |
254 | case TYPE_CODE_STRING: | |
255 | case TYPE_CODE_ERROR: | |
256 | case TYPE_CODE_MEMBER: | |
257 | case TYPE_CODE_METHOD: | |
258 | case TYPE_CODE_REF: | |
259 | error ("internal error: unhandled type in print_type_scalar"); | |
260 | break; | |
261 | ||
262 | default: | |
263 | error ("Invalid type code in symbol table."); | |
264 | } | |
265 | gdb_flush (stream); | |
266 | } | |
267 | ||
c906108c SS |
268 | /* Dump details of a type specified either directly or indirectly. |
269 | Uses the same sort of type lookup mechanism as ptype_command() | |
270 | and whatis_command(). */ | |
271 | ||
272 | void | |
273 | maintenance_print_type (typename, from_tty) | |
274 | char *typename; | |
275 | int from_tty; | |
276 | { | |
277 | register value_ptr val; | |
278 | register struct type *type; | |
279 | register struct cleanup *old_chain; | |
280 | struct expression *expr; | |
281 | ||
282 | if (typename != NULL) | |
c5aa993b JM |
283 | { |
284 | expr = parse_expression (typename); | |
285 | old_chain = make_cleanup ((make_cleanup_func) free_current_contents, &expr); | |
286 | if (expr->elts[0].opcode == OP_TYPE) | |
287 | { | |
288 | /* The user expression names a type directly, just use that type. */ | |
289 | type = expr->elts[1].type; | |
290 | } | |
291 | else | |
292 | { | |
293 | /* The user expression may name a type indirectly by naming an | |
294 | object of that type. Find that indirectly named type. */ | |
295 | val = evaluate_type (expr); | |
296 | type = VALUE_TYPE (val); | |
297 | } | |
298 | if (type != NULL) | |
299 | { | |
300 | recursive_dump_type (type, 0); | |
301 | } | |
302 | do_cleanups (old_chain); | |
303 | } | |
c906108c | 304 | } |
c906108c | 305 | \f |
c5aa993b | 306 | |
c906108c SS |
307 | void |
308 | _initialize_typeprint () | |
309 | { | |
310 | ||
311 | add_com ("ptype", class_vars, ptype_command, | |
312 | "Print definition of type TYPE.\n\ | |
313 | Argument may be a type name defined by typedef, or \"struct STRUCT-TAG\"\n\ | |
314 | or \"class CLASS-NAME\" or \"union UNION-TAG\" or \"enum ENUM-TAG\".\n\ | |
315 | The selected stack frame's lexical context is used to look up the name."); | |
316 | ||
317 | add_com ("whatis", class_vars, whatis_command, | |
318 | "Print data type of expression EXP."); | |
319 | ||
320 | } |