| 1 | /* Language independent support for printing types for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986, 1988-1989, 1991-1995, 1998-2001, 2003, 2006-2012 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 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. |
| 12 | |
| 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. |
| 17 | |
| 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/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "gdb_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 "cp-abi.h" |
| 34 | #include "typeprint.h" |
| 35 | #include "gdb_string.h" |
| 36 | #include "exceptions.h" |
| 37 | #include "valprint.h" |
| 38 | #include <errno.h> |
| 39 | |
| 40 | extern void _initialize_typeprint (void); |
| 41 | |
| 42 | static void ptype_command (char *, int); |
| 43 | |
| 44 | static void whatis_command (char *, int); |
| 45 | |
| 46 | static void whatis_exp (char *, int); |
| 47 | |
| 48 | |
| 49 | /* Print a description of a type in the format of a |
| 50 | typedef for the current language. |
| 51 | NEW is the new name for a type TYPE. */ |
| 52 | |
| 53 | void |
| 54 | typedef_print (struct type *type, struct symbol *new, struct ui_file *stream) |
| 55 | { |
| 56 | LA_PRINT_TYPEDEF (type, new, stream); |
| 57 | } |
| 58 | |
| 59 | /* The default way to print a typedef. */ |
| 60 | |
| 61 | void |
| 62 | default_print_typedef (struct type *type, struct symbol *new_symbol, |
| 63 | struct ui_file *stream) |
| 64 | { |
| 65 | error (_("Language not supported.")); |
| 66 | } |
| 67 | |
| 68 | /* Print a description of a type TYPE in the form of a declaration of a |
| 69 | variable named VARSTRING. (VARSTRING is demangled if necessary.) |
| 70 | Output goes to STREAM (via stdio). |
| 71 | If SHOW is positive, we show the contents of the outermost level |
| 72 | of structure even if there is a type name that could be used instead. |
| 73 | If SHOW is negative, we never show the details of elements' types. */ |
| 74 | |
| 75 | void |
| 76 | type_print (struct type *type, const char *varstring, struct ui_file *stream, |
| 77 | int show) |
| 78 | { |
| 79 | LA_PRINT_TYPE (type, varstring, stream, show, 0); |
| 80 | } |
| 81 | |
| 82 | /* Print TYPE to a string, returning it. The caller is responsible for |
| 83 | freeing the string. */ |
| 84 | |
| 85 | char * |
| 86 | type_to_string (struct type *type) |
| 87 | { |
| 88 | char *s = NULL; |
| 89 | struct ui_file *stb; |
| 90 | struct cleanup *old_chain; |
| 91 | volatile struct gdb_exception except; |
| 92 | |
| 93 | stb = mem_fileopen (); |
| 94 | old_chain = make_cleanup_ui_file_delete (stb); |
| 95 | |
| 96 | TRY_CATCH (except, RETURN_MASK_ALL) |
| 97 | { |
| 98 | type_print (type, "", stb, -1); |
| 99 | s = ui_file_xstrdup (stb, NULL); |
| 100 | } |
| 101 | if (except.reason < 0) |
| 102 | s = NULL; |
| 103 | |
| 104 | do_cleanups (old_chain); |
| 105 | |
| 106 | return s; |
| 107 | } |
| 108 | |
| 109 | /* Print type of EXP, or last thing in value history if EXP == NULL. |
| 110 | show is passed to type_print. */ |
| 111 | |
| 112 | static void |
| 113 | whatis_exp (char *exp, int show) |
| 114 | { |
| 115 | struct expression *expr; |
| 116 | struct value *val; |
| 117 | struct cleanup *old_chain = NULL; |
| 118 | struct type *real_type = NULL; |
| 119 | struct type *type; |
| 120 | int full = 0; |
| 121 | int top = -1; |
| 122 | int using_enc = 0; |
| 123 | struct value_print_options opts; |
| 124 | |
| 125 | if (exp) |
| 126 | { |
| 127 | expr = parse_expression (exp); |
| 128 | old_chain = make_cleanup (free_current_contents, &expr); |
| 129 | val = evaluate_type (expr); |
| 130 | } |
| 131 | else |
| 132 | val = access_value_history (0); |
| 133 | |
| 134 | type = value_type (val); |
| 135 | |
| 136 | get_user_print_options (&opts); |
| 137 | if (opts.objectprint) |
| 138 | { |
| 139 | if (((TYPE_CODE (type) == TYPE_CODE_PTR) |
| 140 | || (TYPE_CODE (type) == TYPE_CODE_REF)) |
| 141 | && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS)) |
| 142 | real_type = value_rtti_indirect_type (val, &full, &top, &using_enc); |
| 143 | else if (TYPE_CODE (type) == TYPE_CODE_CLASS) |
| 144 | real_type = value_rtti_type (val, &full, &top, &using_enc); |
| 145 | } |
| 146 | |
| 147 | printf_filtered ("type = "); |
| 148 | |
| 149 | if (real_type) |
| 150 | { |
| 151 | printf_filtered ("/* real type = "); |
| 152 | type_print (real_type, "", gdb_stdout, -1); |
| 153 | if (! full) |
| 154 | printf_filtered (" (incomplete object)"); |
| 155 | printf_filtered (" */\n"); |
| 156 | } |
| 157 | |
| 158 | type_print (type, "", gdb_stdout, show); |
| 159 | printf_filtered ("\n"); |
| 160 | |
| 161 | if (exp) |
| 162 | do_cleanups (old_chain); |
| 163 | } |
| 164 | |
| 165 | static void |
| 166 | whatis_command (char *exp, int from_tty) |
| 167 | { |
| 168 | /* Most of the time users do not want to see all the fields |
| 169 | in a structure. If they do they can use the "ptype" command. |
| 170 | Hence the "-1" below. */ |
| 171 | whatis_exp (exp, -1); |
| 172 | } |
| 173 | |
| 174 | /* TYPENAME is either the name of a type, or an expression. */ |
| 175 | |
| 176 | static void |
| 177 | ptype_command (char *typename, int from_tty) |
| 178 | { |
| 179 | whatis_exp (typename, 1); |
| 180 | } |
| 181 | |
| 182 | /* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM. |
| 183 | Used to print data from type structures in a specified type. For example, |
| 184 | array bounds may be characters or booleans in some languages, and this |
| 185 | allows the ranges to be printed in their "natural" form rather than as |
| 186 | decimal integer values. |
| 187 | |
| 188 | FIXME: This is here simply because only the type printing routines |
| 189 | currently use it, and it wasn't clear if it really belonged somewhere |
| 190 | else (like printcmd.c). There are a lot of other gdb routines that do |
| 191 | something similar, but they are generally concerned with printing values |
| 192 | that come from the inferior in target byte order and target size. */ |
| 193 | |
| 194 | void |
| 195 | print_type_scalar (struct type *type, LONGEST val, struct ui_file *stream) |
| 196 | { |
| 197 | unsigned int i; |
| 198 | unsigned len; |
| 199 | |
| 200 | CHECK_TYPEDEF (type); |
| 201 | |
| 202 | switch (TYPE_CODE (type)) |
| 203 | { |
| 204 | |
| 205 | case TYPE_CODE_ENUM: |
| 206 | len = TYPE_NFIELDS (type); |
| 207 | for (i = 0; i < len; i++) |
| 208 | { |
| 209 | if (TYPE_FIELD_BITPOS (type, i) == val) |
| 210 | { |
| 211 | break; |
| 212 | } |
| 213 | } |
| 214 | if (i < len) |
| 215 | { |
| 216 | fputs_filtered (TYPE_FIELD_NAME (type, i), stream); |
| 217 | } |
| 218 | else |
| 219 | { |
| 220 | print_longest (stream, 'd', 0, val); |
| 221 | } |
| 222 | break; |
| 223 | |
| 224 | case TYPE_CODE_INT: |
| 225 | print_longest (stream, TYPE_UNSIGNED (type) ? 'u' : 'd', 0, val); |
| 226 | break; |
| 227 | |
| 228 | case TYPE_CODE_CHAR: |
| 229 | LA_PRINT_CHAR ((unsigned char) val, type, stream); |
| 230 | break; |
| 231 | |
| 232 | case TYPE_CODE_BOOL: |
| 233 | fprintf_filtered (stream, val ? "TRUE" : "FALSE"); |
| 234 | break; |
| 235 | |
| 236 | case TYPE_CODE_RANGE: |
| 237 | print_type_scalar (TYPE_TARGET_TYPE (type), val, stream); |
| 238 | return; |
| 239 | |
| 240 | case TYPE_CODE_UNDEF: |
| 241 | case TYPE_CODE_PTR: |
| 242 | case TYPE_CODE_ARRAY: |
| 243 | case TYPE_CODE_STRUCT: |
| 244 | case TYPE_CODE_UNION: |
| 245 | case TYPE_CODE_FUNC: |
| 246 | case TYPE_CODE_FLT: |
| 247 | case TYPE_CODE_VOID: |
| 248 | case TYPE_CODE_SET: |
| 249 | case TYPE_CODE_STRING: |
| 250 | case TYPE_CODE_ERROR: |
| 251 | case TYPE_CODE_MEMBERPTR: |
| 252 | case TYPE_CODE_METHODPTR: |
| 253 | case TYPE_CODE_METHOD: |
| 254 | case TYPE_CODE_REF: |
| 255 | case TYPE_CODE_NAMESPACE: |
| 256 | error (_("internal error: unhandled type in print_type_scalar")); |
| 257 | break; |
| 258 | |
| 259 | default: |
| 260 | error (_("Invalid type code in symbol table.")); |
| 261 | } |
| 262 | gdb_flush (stream); |
| 263 | } |
| 264 | |
| 265 | /* Dump details of a type specified either directly or indirectly. |
| 266 | Uses the same sort of type lookup mechanism as ptype_command() |
| 267 | and whatis_command(). */ |
| 268 | |
| 269 | void |
| 270 | maintenance_print_type (char *typename, int from_tty) |
| 271 | { |
| 272 | struct value *val; |
| 273 | struct type *type; |
| 274 | struct cleanup *old_chain; |
| 275 | struct expression *expr; |
| 276 | |
| 277 | if (typename != NULL) |
| 278 | { |
| 279 | expr = parse_expression (typename); |
| 280 | old_chain = make_cleanup (free_current_contents, &expr); |
| 281 | if (expr->elts[0].opcode == OP_TYPE) |
| 282 | { |
| 283 | /* The user expression names a type directly, just use that type. */ |
| 284 | type = expr->elts[1].type; |
| 285 | } |
| 286 | else |
| 287 | { |
| 288 | /* The user expression may name a type indirectly by naming an |
| 289 | object of that type. Find that indirectly named type. */ |
| 290 | val = evaluate_type (expr); |
| 291 | type = value_type (val); |
| 292 | } |
| 293 | if (type != NULL) |
| 294 | { |
| 295 | recursive_dump_type (type, 0); |
| 296 | } |
| 297 | do_cleanups (old_chain); |
| 298 | } |
| 299 | } |
| 300 | \f |
| 301 | |
| 302 | void |
| 303 | _initialize_typeprint (void) |
| 304 | { |
| 305 | add_com ("ptype", class_vars, ptype_command, _("\ |
| 306 | Print definition of type TYPE.\n\ |
| 307 | Argument may be a type name defined by typedef, or \"struct STRUCT-TAG\"\n\ |
| 308 | or \"class CLASS-NAME\" or \"union UNION-TAG\" or \"enum ENUM-TAG\".\n\ |
| 309 | The selected stack frame's lexical context is used to look up the name.\n\ |
| 310 | Contrary to \"whatis\", \"ptype\" always unrolls any typedefs.")); |
| 311 | |
| 312 | add_com ("whatis", class_vars, whatis_command, |
| 313 | _("Print data type of expression EXP.\n\ |
| 314 | Only one level of typedefs is unrolled. See also \"ptype\".")); |
| 315 | } |