1/* Language independent support for printing types for GDB, the GNU debugger. 2 3 Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1998, 4 1999, 2000, 2001, 2003 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 2 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, write to the Free Software 20 Foundation, Inc., 59 Temple Place - Suite 330, 21 Boston, MA 02111-1307, USA. */ 22 23#include "defs.h" 24#include "gdb_obstack.h" 25#include "bfd.h" /* Binary File Description */ 26#include "symtab.h" 27#include "gdbtypes.h" 28#include "expression.h" 29#include "value.h" 30#include "gdbcore.h" 31#include "command.h" 32#include "gdbcmd.h" 33#include "target.h" 34#include "language.h" 35#include "cp-abi.h" 36#include "typeprint.h" 37#include "gdb_string.h" 38#include <errno.h> 39 40/* For real-type printing in whatis_exp() */ 41extern int objectprint; /* Controls looking up an object's derived type 42 using what we find in its vtables. */ 43 44extern void _initialize_typeprint (void); 45 46static void ptype_command (char *, int); 47 48static struct type *ptype_eval (struct expression *); 49 50static void whatis_command (char *, int); 51 52static void whatis_exp (char *, int); 53 54/* Print a description of a type in the format of a 55 typedef for the current language. 56 NEW is the new name for a type TYPE. */ 57 58void 59typedef_print (struct type *type, struct symbol *new, struct ui_file *stream) 60{ 61 CHECK_TYPEDEF (type); 62 switch (current_language->la_language) 63 { 64#ifdef _LANG_c 65 case language_c: 66 case language_cplus: 67 fprintf_filtered (stream, "typedef "); 68 type_print (type, "", stream, 0); 69 if (TYPE_NAME ((SYMBOL_TYPE (new))) == 0 70 || strcmp (TYPE_NAME ((SYMBOL_TYPE (new))), DEPRECATED_SYMBOL_NAME (new)) != 0) 71 fprintf_filtered (stream, " %s", SYMBOL_PRINT_NAME (new)); 72 break; 73#endif 74#ifdef _LANG_m2 75 case language_m2: 76 fprintf_filtered (stream, "TYPE "); 77 if (!TYPE_NAME (SYMBOL_TYPE (new)) 78 || strcmp (TYPE_NAME ((SYMBOL_TYPE (new))), DEPRECATED_SYMBOL_NAME (new)) != 0) 79 fprintf_filtered (stream, "%s = ", SYMBOL_PRINT_NAME (new)); 80 else 81 fprintf_filtered (stream, "<builtin> = "); 82 type_print (type, "", stream, 0); 83 break; 84#endif 85#ifdef _LANG_pascal 86 case language_pascal: 87 fprintf_filtered (stream, "type "); 88 fprintf_filtered (stream, "%s = ", SYMBOL_PRINT_NAME (new)); 89 type_print (type, "", stream, 0); 90 break; 91#endif 92 default: 93 error ("Language not supported."); 94 } 95 fprintf_filtered (stream, ";\n"); 96} 97 98/* Print a description of a type TYPE in the form of a declaration of a 99 variable named VARSTRING. (VARSTRING is demangled if necessary.) 100 Output goes to STREAM (via stdio). 101 If SHOW is positive, we show the contents of the outermost level 102 of structure even if there is a type name that could be used instead. 103 If SHOW is negative, we never show the details of elements' types. */ 104 105void 106type_print (struct type *type, char *varstring, struct ui_file *stream, 107 int show) 108{ 109 LA_PRINT_TYPE (type, varstring, stream, show, 0); 110} 111 112/* Print type of EXP, or last thing in value history if EXP == NULL. 113 show is passed to type_print. */ 114 115static void 116whatis_exp (char *exp, int show) 117{ 118 struct expression *expr; 119 struct value *val; 120 struct cleanup *old_chain = NULL; 121 struct type *real_type = NULL; 122 struct type *type; 123 int full = 0; 124 int top = -1; 125 int using_enc = 0; 126 127 if (exp) 128 { 129 expr = parse_expression (exp); 130 old_chain = make_cleanup (free_current_contents, &expr); 131 val = evaluate_type (expr); 132 } 133 else 134 val = access_value_history (0); 135 136 type = VALUE_TYPE (val); 137 138 if (objectprint) 139 { 140 if (((TYPE_CODE (type) == TYPE_CODE_PTR) || 141 (TYPE_CODE (type) == TYPE_CODE_REF)) 142 && 143 (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS)) 144 { 145 real_type = value_rtti_target_type (val, &full, &top, &using_enc); 146 if (real_type) 147 { 148 if (TYPE_CODE (type) == TYPE_CODE_PTR) 149 real_type = lookup_pointer_type (real_type); 150 else 151 real_type = lookup_reference_type (real_type); 152 } 153 } 154 else if (TYPE_CODE (type) == TYPE_CODE_CLASS) 155 real_type = value_rtti_type (val, &full, &top, &using_enc); 156 } 157 158 printf_filtered ("type = "); 159 160 if (real_type) 161 { 162 printf_filtered ("/* real type = "); 163 type_print (real_type, "", gdb_stdout, -1); 164 if (! full) 165 printf_filtered (" (incomplete object)"); 166 printf_filtered (" */\n"); 167 } 168 169 type_print (type, "", gdb_stdout, show); 170 printf_filtered ("\n"); 171 172 if (exp) 173 do_cleanups (old_chain); 174} 175 176static void 177whatis_command (char *exp, int from_tty) 178{ 179 /* Most of the time users do not want to see all the fields 180 in a structure. If they do they can use the "ptype" command. 181 Hence the "-1" below. */ 182 whatis_exp (exp, -1); 183} 184 185/* Simple subroutine for ptype_command. */ 186 187static struct type * 188ptype_eval (struct expression *exp) 189{ 190 if (exp->elts[0].opcode == OP_TYPE) 191 { 192 return (exp->elts[1].type); 193 } 194 else 195 { 196 return (NULL); 197 } 198} 199 200/* TYPENAME is either the name of a type, or an expression. */ 201 202static void 203ptype_command (char *typename, int from_tty) 204{ 205 struct type *type; 206 struct expression *expr; 207 struct cleanup *old_chain; 208 209 if (typename == NULL) 210 { 211 /* Print type of last thing in value history. */ 212 whatis_exp (typename, 1); 213 } 214 else 215 { 216 expr = parse_expression (typename); 217 old_chain = make_cleanup (free_current_contents, &expr); 218 type = ptype_eval (expr); 219 if (type != NULL) 220 { 221 /* User did "ptype <typename>" */ 222 printf_filtered ("type = "); 223 type_print (type, "", gdb_stdout, 1); 224 printf_filtered ("\n"); 225 do_cleanups (old_chain); 226 } 227 else 228 { 229 /* User did "ptype <symbolname>" */ 230 do_cleanups (old_chain); 231 whatis_exp (typename, 1); 232 } 233 } 234} 235 236/* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM. 237 Used to print data from type structures in a specified type. For example, 238 array bounds may be characters or booleans in some languages, and this 239 allows the ranges to be printed in their "natural" form rather than as 240 decimal integer values. 241 242 FIXME: This is here simply because only the type printing routines 243 currently use it, and it wasn't clear if it really belonged somewhere 244 else (like printcmd.c). There are a lot of other gdb routines that do 245 something similar, but they are generally concerned with printing values 246 that come from the inferior in target byte order and target size. */ 247 248void 249print_type_scalar (struct type *type, LONGEST val, struct ui_file *stream) 250{ 251 unsigned int i; 252 unsigned len; 253 254 CHECK_TYPEDEF (type); 255 256 switch (TYPE_CODE (type)) 257 { 258 259 case TYPE_CODE_ENUM: 260 len = TYPE_NFIELDS (type); 261 for (i = 0; i < len; i++) 262 { 263 if (TYPE_FIELD_BITPOS (type, i) == val) 264 { 265 break; 266 } 267 } 268 if (i < len) 269 { 270 fputs_filtered (TYPE_FIELD_NAME (type, i), stream); 271 } 272 else 273 { 274 print_longest (stream, 'd', 0, val); 275 } 276 break; 277 278 case TYPE_CODE_INT: 279 print_longest (stream, TYPE_UNSIGNED (type) ? 'u' : 'd', 0, val); 280 break; 281 282 case TYPE_CODE_CHAR: 283 LA_PRINT_CHAR ((unsigned char) val, stream); 284 break; 285 286 case TYPE_CODE_BOOL: 287 fprintf_filtered (stream, val ? "TRUE" : "FALSE"); 288 break; 289 290 case TYPE_CODE_RANGE: 291 print_type_scalar (TYPE_TARGET_TYPE (type), val, stream); 292 return; 293 294 case TYPE_CODE_UNDEF: 295 case TYPE_CODE_PTR: 296 case TYPE_CODE_ARRAY: 297 case TYPE_CODE_STRUCT: 298 case TYPE_CODE_UNION: 299 case TYPE_CODE_FUNC: 300 case TYPE_CODE_FLT: 301 case TYPE_CODE_VOID: 302 case TYPE_CODE_SET: 303 case TYPE_CODE_STRING: 304 case TYPE_CODE_ERROR: 305 case TYPE_CODE_MEMBER: 306 case TYPE_CODE_METHOD: 307 case TYPE_CODE_REF: 308 case TYPE_CODE_NAMESPACE: 309 error ("internal error: unhandled type in print_type_scalar"); 310 break; 311 312 default: 313 error ("Invalid type code in symbol table."); 314 } 315 gdb_flush (stream); 316} 317 318/* Dump details of a type specified either directly or indirectly. 319 Uses the same sort of type lookup mechanism as ptype_command() 320 and whatis_command(). */ 321 322void 323maintenance_print_type (char *typename, int from_tty) 324{ 325 struct value *val; 326 struct type *type; 327 struct cleanup *old_chain; 328 struct expression *expr; 329 330 if (typename != NULL) 331 { 332 expr = parse_expression (typename); 333 old_chain = make_cleanup (free_current_contents, &expr); 334 if (expr->elts[0].opcode == OP_TYPE) 335 { 336 /* The user expression names a type directly, just use that type. */ 337 type = expr->elts[1].type; 338 } 339 else 340 { 341 /* The user expression may name a type indirectly by naming an 342 object of that type. Find that indirectly named type. */ 343 val = evaluate_type (expr); 344 type = VALUE_TYPE (val); 345 } 346 if (type != NULL) 347 { 348 recursive_dump_type (type, 0); 349 } 350 do_cleanups (old_chain); 351 } 352} 353 354 355void 356_initialize_typeprint (void) 357{ 358 359 add_com ("ptype", class_vars, ptype_command, 360 "Print definition of type TYPE.\n\ 361Argument may be a type name defined by typedef, or \"struct STRUCT-TAG\"\n\ 362or \"class CLASS-NAME\" or \"union UNION-TAG\" or \"enum ENUM-TAG\".\n\ 363The selected stack frame's lexical context is used to look up the name."); 364 365 add_com ("whatis", class_vars, whatis_command, 366 "Print data type of expression EXP."); 367 368} 369