| 1 | /* Language independent support for printing types for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1998, 1999, |
| 4 | 2000, 2001, 2003, 2006, 2007, 2008, 2009, 2010, 2011 |
| 5 | Free Software Foundation, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "gdb_obstack.h" |
| 24 | #include "bfd.h" /* Binary File Description */ |
| 25 | #include "symtab.h" |
| 26 | #include "gdbtypes.h" |
| 27 | #include "expression.h" |
| 28 | #include "value.h" |
| 29 | #include "gdbcore.h" |
| 30 | #include "command.h" |
| 31 | #include "gdbcmd.h" |
| 32 | #include "target.h" |
| 33 | #include "language.h" |
| 34 | #include "cp-abi.h" |
| 35 | #include "typeprint.h" |
| 36 | #include "gdb_string.h" |
| 37 | #include "exceptions.h" |
| 38 | #include "valprint.h" |
| 39 | #include <errno.h> |
| 40 | |
| 41 | extern void _initialize_typeprint (void); |
| 42 | |
| 43 | static void ptype_command (char *, int); |
| 44 | |
| 45 | static void whatis_command (char *, int); |
| 46 | |
| 47 | static void whatis_exp (char *, int); |
| 48 | |
| 49 | |
| 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. */ |
| 53 | |
| 54 | void |
| 55 | typedef_print (struct type *type, struct symbol *new, struct ui_file *stream) |
| 56 | { |
| 57 | LA_PRINT_TYPEDEF (type, new, stream); |
| 58 | } |
| 59 | |
| 60 | /* The default way to print a typedef. */ |
| 61 | |
| 62 | void |
| 63 | default_print_typedef (struct type *type, struct symbol *new_symbol, |
| 64 | struct ui_file *stream) |
| 65 | { |
| 66 | error (_("Language not supported.")); |
| 67 | } |
| 68 | |
| 69 | /* Print a description of a type TYPE in the form of a declaration of a |
| 70 | variable named VARSTRING. (VARSTRING is demangled if necessary.) |
| 71 | Output goes to STREAM (via stdio). |
| 72 | If SHOW is positive, we show the contents of the outermost level |
| 73 | of structure even if there is a type name that could be used instead. |
| 74 | If SHOW is negative, we never show the details of elements' types. */ |
| 75 | |
| 76 | void |
| 77 | type_print (struct type *type, char *varstring, struct ui_file *stream, |
| 78 | int show) |
| 79 | { |
| 80 | LA_PRINT_TYPE (type, varstring, stream, show, 0); |
| 81 | } |
| 82 | |
| 83 | /* Print TYPE to a string, returning it. The caller is responsible for |
| 84 | freeing the string. */ |
| 85 | |
| 86 | char * |
| 87 | type_to_string (struct type *type) |
| 88 | { |
| 89 | char *s = NULL; |
| 90 | struct ui_file *stb; |
| 91 | struct cleanup *old_chain; |
| 92 | volatile struct gdb_exception except; |
| 93 | |
| 94 | stb = mem_fileopen (); |
| 95 | old_chain = make_cleanup_ui_file_delete (stb); |
| 96 | |
| 97 | TRY_CATCH (except, RETURN_MASK_ALL) |
| 98 | { |
| 99 | type_print (type, "", stb, -1); |
| 100 | s = ui_file_xstrdup (stb, NULL); |
| 101 | } |
| 102 | if (except.reason < 0) |
| 103 | s = NULL; |
| 104 | |
| 105 | do_cleanups (old_chain); |
| 106 | |
| 107 | return s; |
| 108 | } |
| 109 | |
| 110 | /* Print type of EXP, or last thing in value history if EXP == NULL. |
| 111 | show is passed to type_print. */ |
| 112 | |
| 113 | static void |
| 114 | whatis_exp (char *exp, int show) |
| 115 | { |
| 116 | struct expression *expr; |
| 117 | struct value *val; |
| 118 | struct cleanup *old_chain = NULL; |
| 119 | struct type *real_type = NULL; |
| 120 | struct type *type; |
| 121 | int full = 0; |
| 122 | int top = -1; |
| 123 | int using_enc = 0; |
| 124 | struct value_print_options opts; |
| 125 | |
| 126 | if (exp) |
| 127 | { |
| 128 | expr = parse_expression (exp); |
| 129 | old_chain = make_cleanup (free_current_contents, &expr); |
| 130 | val = evaluate_type (expr); |
| 131 | } |
| 132 | else |
| 133 | val = access_value_history (0); |
| 134 | |
| 135 | type = value_type (val); |
| 136 | |
| 137 | get_user_print_options (&opts); |
| 138 | if (opts.objectprint) |
| 139 | { |
| 140 | if (((TYPE_CODE (type) == TYPE_CODE_PTR) |
| 141 | || (TYPE_CODE (type) == TYPE_CODE_REF)) |
| 142 | && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS)) |
| 143 | { |
| 144 | real_type = value_rtti_target_type (val, &full, &top, &using_enc); |
| 145 | if (real_type) |
| 146 | { |
| 147 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 148 | real_type = lookup_pointer_type (real_type); |
| 149 | else |
| 150 | real_type = lookup_reference_type (real_type); |
| 151 | } |
| 152 | } |
| 153 | else if (TYPE_CODE (type) == TYPE_CODE_CLASS) |
| 154 | real_type = value_rtti_type (val, &full, &top, &using_enc); |
| 155 | } |
| 156 | |
| 157 | printf_filtered ("type = "); |
| 158 | |
| 159 | if (real_type) |
| 160 | { |
| 161 | printf_filtered ("/* real type = "); |
| 162 | type_print (real_type, "", gdb_stdout, -1); |
| 163 | if (! full) |
| 164 | printf_filtered (" (incomplete object)"); |
| 165 | printf_filtered (" */\n"); |
| 166 | } |
| 167 | |
| 168 | type_print (type, "", gdb_stdout, show); |
| 169 | printf_filtered ("\n"); |
| 170 | |
| 171 | if (exp) |
| 172 | do_cleanups (old_chain); |
| 173 | } |
| 174 | |
| 175 | static void |
| 176 | whatis_command (char *exp, int from_tty) |
| 177 | { |
| 178 | /* Most of the time users do not want to see all the fields |
| 179 | in a structure. If they do they can use the "ptype" command. |
| 180 | Hence the "-1" below. */ |
| 181 | whatis_exp (exp, -1); |
| 182 | } |
| 183 | |
| 184 | /* TYPENAME is either the name of a type, or an expression. */ |
| 185 | |
| 186 | static void |
| 187 | ptype_command (char *typename, int from_tty) |
| 188 | { |
| 189 | whatis_exp (typename, 1); |
| 190 | } |
| 191 | |
| 192 | /* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM. |
| 193 | Used to print data from type structures in a specified type. For example, |
| 194 | array bounds may be characters or booleans in some languages, and this |
| 195 | allows the ranges to be printed in their "natural" form rather than as |
| 196 | decimal integer values. |
| 197 | |
| 198 | FIXME: This is here simply because only the type printing routines |
| 199 | currently use it, and it wasn't clear if it really belonged somewhere |
| 200 | else (like printcmd.c). There are a lot of other gdb routines that do |
| 201 | something similar, but they are generally concerned with printing values |
| 202 | that come from the inferior in target byte order and target size. */ |
| 203 | |
| 204 | void |
| 205 | print_type_scalar (struct type *type, LONGEST val, struct ui_file *stream) |
| 206 | { |
| 207 | unsigned int i; |
| 208 | unsigned len; |
| 209 | |
| 210 | CHECK_TYPEDEF (type); |
| 211 | |
| 212 | switch (TYPE_CODE (type)) |
| 213 | { |
| 214 | |
| 215 | case TYPE_CODE_ENUM: |
| 216 | len = TYPE_NFIELDS (type); |
| 217 | for (i = 0; i < len; i++) |
| 218 | { |
| 219 | if (TYPE_FIELD_BITPOS (type, i) == val) |
| 220 | { |
| 221 | break; |
| 222 | } |
| 223 | } |
| 224 | if (i < len) |
| 225 | { |
| 226 | fputs_filtered (TYPE_FIELD_NAME (type, i), stream); |
| 227 | } |
| 228 | else |
| 229 | { |
| 230 | print_longest (stream, 'd', 0, val); |
| 231 | } |
| 232 | break; |
| 233 | |
| 234 | case TYPE_CODE_INT: |
| 235 | print_longest (stream, TYPE_UNSIGNED (type) ? 'u' : 'd', 0, val); |
| 236 | break; |
| 237 | |
| 238 | case TYPE_CODE_CHAR: |
| 239 | LA_PRINT_CHAR ((unsigned char) val, type, stream); |
| 240 | break; |
| 241 | |
| 242 | case TYPE_CODE_BOOL: |
| 243 | fprintf_filtered (stream, val ? "TRUE" : "FALSE"); |
| 244 | break; |
| 245 | |
| 246 | case TYPE_CODE_RANGE: |
| 247 | print_type_scalar (TYPE_TARGET_TYPE (type), val, stream); |
| 248 | return; |
| 249 | |
| 250 | case TYPE_CODE_UNDEF: |
| 251 | case TYPE_CODE_PTR: |
| 252 | case TYPE_CODE_ARRAY: |
| 253 | case TYPE_CODE_STRUCT: |
| 254 | case TYPE_CODE_UNION: |
| 255 | case TYPE_CODE_FUNC: |
| 256 | case TYPE_CODE_FLT: |
| 257 | case TYPE_CODE_VOID: |
| 258 | case TYPE_CODE_SET: |
| 259 | case TYPE_CODE_STRING: |
| 260 | case TYPE_CODE_ERROR: |
| 261 | case TYPE_CODE_MEMBERPTR: |
| 262 | case TYPE_CODE_METHODPTR: |
| 263 | case TYPE_CODE_METHOD: |
| 264 | case TYPE_CODE_REF: |
| 265 | case TYPE_CODE_NAMESPACE: |
| 266 | error (_("internal error: unhandled type in print_type_scalar")); |
| 267 | break; |
| 268 | |
| 269 | default: |
| 270 | error (_("Invalid type code in symbol table.")); |
| 271 | } |
| 272 | gdb_flush (stream); |
| 273 | } |
| 274 | |
| 275 | /* Dump details of a type specified either directly or indirectly. |
| 276 | Uses the same sort of type lookup mechanism as ptype_command() |
| 277 | and whatis_command(). */ |
| 278 | |
| 279 | void |
| 280 | maintenance_print_type (char *typename, int from_tty) |
| 281 | { |
| 282 | struct value *val; |
| 283 | struct type *type; |
| 284 | struct cleanup *old_chain; |
| 285 | struct expression *expr; |
| 286 | |
| 287 | if (typename != NULL) |
| 288 | { |
| 289 | expr = parse_expression (typename); |
| 290 | old_chain = make_cleanup (free_current_contents, &expr); |
| 291 | if (expr->elts[0].opcode == OP_TYPE) |
| 292 | { |
| 293 | /* The user expression names a type directly, just use that type. */ |
| 294 | type = expr->elts[1].type; |
| 295 | } |
| 296 | else |
| 297 | { |
| 298 | /* The user expression may name a type indirectly by naming an |
| 299 | object of that type. Find that indirectly named type. */ |
| 300 | val = evaluate_type (expr); |
| 301 | type = value_type (val); |
| 302 | } |
| 303 | if (type != NULL) |
| 304 | { |
| 305 | recursive_dump_type (type, 0); |
| 306 | } |
| 307 | do_cleanups (old_chain); |
| 308 | } |
| 309 | } |
| 310 | \f |
| 311 | |
| 312 | void |
| 313 | _initialize_typeprint (void) |
| 314 | { |
| 315 | add_com ("ptype", class_vars, ptype_command, _("\ |
| 316 | Print definition of type TYPE.\n\ |
| 317 | Argument may be a type name defined by typedef, or \"struct STRUCT-TAG\"\n\ |
| 318 | or \"class CLASS-NAME\" or \"union UNION-TAG\" or \"enum ENUM-TAG\".\n\ |
| 319 | The selected stack frame's lexical context is used to look up the name.\n\ |
| 320 | Contrary to \"whatis\", \"ptype\" always unrolls any typedefs.")); |
| 321 | |
| 322 | add_com ("whatis", class_vars, whatis_command, |
| 323 | _("Print data type of expression EXP.\n\ |
| 324 | Only one level of typedefs is unrolled. See also \"ptype\".")); |
| 325 | } |