| 1 | /* Support for printing C values for GDB, the GNU debugger. |
| 2 | Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "symtab.h" |
| 23 | #include "gdbtypes.h" |
| 24 | #include "expression.h" |
| 25 | #include "value.h" |
| 26 | #include "demangle.h" |
| 27 | #include "valprint.h" |
| 28 | #include "language.h" |
| 29 | |
| 30 | /* BEGIN-FIXME */ |
| 31 | |
| 32 | extern int vtblprint; /* Controls printing of vtbl's */ |
| 33 | extern int demangle; /* whether to print C++ syms raw or src-form */ |
| 34 | |
| 35 | extern void |
| 36 | cp_print_class_member PARAMS ((char *, struct type *, GDB_FILE *, char *)); |
| 37 | |
| 38 | extern void |
| 39 | cp_print_class_method PARAMS ((char *, struct type *, GDB_FILE *)); |
| 40 | |
| 41 | extern void |
| 42 | cp_print_value_fields PARAMS ((struct type *, char *, GDB_FILE *, int, int, |
| 43 | enum val_prettyprint, struct type **)); |
| 44 | |
| 45 | extern int |
| 46 | cp_is_vtbl_ptr_type PARAMS ((struct type *)); |
| 47 | |
| 48 | extern int |
| 49 | cp_is_vtbl_member PARAMS ((struct type *)); |
| 50 | |
| 51 | /* END-FIXME */ |
| 52 | |
| 53 | |
| 54 | /* BEGIN-FIXME: Hooks into c-typeprint.c */ |
| 55 | |
| 56 | extern void |
| 57 | c_type_print_varspec_prefix PARAMS ((struct type *, GDB_FILE *, int, int)); |
| 58 | |
| 59 | extern void |
| 60 | cp_type_print_method_args PARAMS ((struct type **, char *, char *, int, |
| 61 | GDB_FILE *)); |
| 62 | /* END-FIXME */ |
| 63 | |
| 64 | |
| 65 | extern struct obstack dont_print_obstack; |
| 66 | |
| 67 | \f |
| 68 | /* Print data of type TYPE located at VALADDR (within GDB), which came from |
| 69 | the inferior at address ADDRESS, onto stdio stream STREAM according to |
| 70 | FORMAT (a letter or 0 for natural format). The data at VALADDR is in |
| 71 | target byte order. |
| 72 | |
| 73 | If the data are a string pointer, returns the number of string characters |
| 74 | printed. |
| 75 | |
| 76 | If DEREF_REF is nonzero, then dereference references, otherwise just print |
| 77 | them like pointers. |
| 78 | |
| 79 | The PRETTY parameter controls prettyprinting. */ |
| 80 | |
| 81 | int |
| 82 | c_val_print (type, valaddr, address, stream, format, deref_ref, recurse, |
| 83 | pretty) |
| 84 | struct type *type; |
| 85 | char *valaddr; |
| 86 | CORE_ADDR address; |
| 87 | GDB_FILE *stream; |
| 88 | int format; |
| 89 | int deref_ref; |
| 90 | int recurse; |
| 91 | enum val_prettyprint pretty; |
| 92 | { |
| 93 | register unsigned int i = 0; /* Number of characters printed */ |
| 94 | unsigned len; |
| 95 | struct type *elttype; |
| 96 | unsigned eltlen; |
| 97 | LONGEST val; |
| 98 | CORE_ADDR addr; |
| 99 | |
| 100 | switch (TYPE_CODE (type)) |
| 101 | { |
| 102 | case TYPE_CODE_ARRAY: |
| 103 | if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0) |
| 104 | { |
| 105 | elttype = TYPE_TARGET_TYPE (type); |
| 106 | eltlen = TYPE_LENGTH (elttype); |
| 107 | len = TYPE_LENGTH (type) / eltlen; |
| 108 | if (prettyprint_arrays) |
| 109 | { |
| 110 | print_spaces_filtered (2 + 2 * recurse, stream); |
| 111 | } |
| 112 | /* For an array of chars, print with string syntax. */ |
| 113 | if (eltlen == 1 && TYPE_CODE (elttype) == TYPE_CODE_INT |
| 114 | && (format == 0 || format == 's')) |
| 115 | { |
| 116 | LA_PRINT_STRING (stream, valaddr, len, 0); |
| 117 | i = len; |
| 118 | } |
| 119 | else |
| 120 | { |
| 121 | fprintf_filtered (stream, "{"); |
| 122 | /* If this is a virtual function table, print the 0th |
| 123 | entry specially, and the rest of the members normally. */ |
| 124 | if (cp_is_vtbl_ptr_type (elttype)) |
| 125 | { |
| 126 | i = 1; |
| 127 | fprintf_filtered (stream, "%d vtable entries", len - 1); |
| 128 | } |
| 129 | else |
| 130 | { |
| 131 | i = 0; |
| 132 | } |
| 133 | val_print_array_elements (type, valaddr, address, stream, |
| 134 | format, deref_ref, recurse, pretty, i); |
| 135 | fprintf_filtered (stream, "}"); |
| 136 | } |
| 137 | break; |
| 138 | } |
| 139 | /* Array of unspecified length: treat like pointer to first elt. */ |
| 140 | addr = address; |
| 141 | goto print_unpacked_pointer; |
| 142 | |
| 143 | case TYPE_CODE_PTR: |
| 144 | if (format && format != 's') |
| 145 | { |
| 146 | print_scalar_formatted (valaddr, type, format, 0, stream); |
| 147 | break; |
| 148 | } |
| 149 | if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD) |
| 150 | { |
| 151 | cp_print_class_method (valaddr, type, stream); |
| 152 | } |
| 153 | else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER) |
| 154 | { |
| 155 | cp_print_class_member (valaddr, |
| 156 | TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)), |
| 157 | stream, "&"); |
| 158 | } |
| 159 | else |
| 160 | { |
| 161 | addr = unpack_pointer (type, valaddr); |
| 162 | print_unpacked_pointer: |
| 163 | elttype = TYPE_TARGET_TYPE (type); |
| 164 | |
| 165 | if (TYPE_CODE (elttype) == TYPE_CODE_FUNC) |
| 166 | { |
| 167 | /* Try to print what function it points to. */ |
| 168 | print_address_demangle (addr, stream, demangle); |
| 169 | /* Return value is irrelevant except for string pointers. */ |
| 170 | return (0); |
| 171 | } |
| 172 | |
| 173 | if (addressprint && format != 's') |
| 174 | { |
| 175 | print_address_numeric (addr, stream); |
| 176 | } |
| 177 | |
| 178 | /* For a pointer to char or unsigned char, also print the string |
| 179 | pointed to, unless pointer is null. */ |
| 180 | if (TYPE_LENGTH (elttype) == 1 |
| 181 | && TYPE_CODE (elttype) == TYPE_CODE_INT |
| 182 | && (format == 0 || format == 's') |
| 183 | && addr != 0) |
| 184 | { |
| 185 | i = val_print_string (addr, 0, stream); |
| 186 | } |
| 187 | else if (cp_is_vtbl_member(type)) |
| 188 | { |
| 189 | /* print vtbl's nicely */ |
| 190 | CORE_ADDR vt_address = unpack_pointer (type, valaddr); |
| 191 | |
| 192 | struct minimal_symbol *msymbol = |
| 193 | lookup_minimal_symbol_by_pc (vt_address); |
| 194 | if ((msymbol != NULL) && |
| 195 | (vt_address == SYMBOL_VALUE_ADDRESS (msymbol))) |
| 196 | { |
| 197 | fputs_filtered (" <", stream); |
| 198 | fputs_filtered (SYMBOL_SOURCE_NAME (msymbol), stream); |
| 199 | fputs_filtered (">", stream); |
| 200 | } |
| 201 | if (vt_address && vtblprint) |
| 202 | { |
| 203 | value vt_val; |
| 204 | struct symbol *wsym = (struct symbol *)NULL; |
| 205 | struct type *wtype; |
| 206 | struct symtab *s; |
| 207 | struct block *block = (struct block *)NULL; |
| 208 | int is_this_fld; |
| 209 | |
| 210 | if (msymbol != NULL) |
| 211 | wsym = lookup_symbol (SYMBOL_NAME(msymbol), block, |
| 212 | VAR_NAMESPACE, &is_this_fld, &s); |
| 213 | |
| 214 | if (wsym) |
| 215 | { |
| 216 | wtype = SYMBOL_TYPE(wsym); |
| 217 | } |
| 218 | else |
| 219 | { |
| 220 | wtype = TYPE_TARGET_TYPE(type); |
| 221 | } |
| 222 | vt_val = value_at (wtype, vt_address); |
| 223 | val_print (VALUE_TYPE (vt_val), VALUE_CONTENTS (vt_val), |
| 224 | VALUE_ADDRESS (vt_val), stream, format, |
| 225 | deref_ref, recurse + 1, pretty); |
| 226 | if (pretty) |
| 227 | { |
| 228 | fprintf_filtered (stream, "\n"); |
| 229 | print_spaces_filtered (2 + 2 * recurse, stream); |
| 230 | } |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | /* Return number of characters printed, plus one for the |
| 235 | terminating null if we have "reached the end". */ |
| 236 | return (i + (print_max && i != print_max)); |
| 237 | } |
| 238 | break; |
| 239 | |
| 240 | case TYPE_CODE_MEMBER: |
| 241 | error ("not implemented: member type in c_val_print"); |
| 242 | break; |
| 243 | |
| 244 | case TYPE_CODE_REF: |
| 245 | if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER) |
| 246 | { |
| 247 | cp_print_class_member (valaddr, |
| 248 | TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)), |
| 249 | stream, ""); |
| 250 | break; |
| 251 | } |
| 252 | if (addressprint) |
| 253 | { |
| 254 | fprintf_filtered (stream, "@"); |
| 255 | print_address_numeric |
| 256 | (extract_address (valaddr, |
| 257 | TARGET_PTR_BIT / HOST_CHAR_BIT), stream); |
| 258 | if (deref_ref) |
| 259 | fputs_filtered (": ", stream); |
| 260 | } |
| 261 | /* De-reference the reference. */ |
| 262 | if (deref_ref) |
| 263 | { |
| 264 | if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF) |
| 265 | { |
| 266 | value deref_val = |
| 267 | value_at |
| 268 | (TYPE_TARGET_TYPE (type), |
| 269 | unpack_pointer (lookup_pointer_type (builtin_type_void), |
| 270 | valaddr)); |
| 271 | val_print (VALUE_TYPE (deref_val), |
| 272 | VALUE_CONTENTS (deref_val), |
| 273 | VALUE_ADDRESS (deref_val), stream, format, |
| 274 | deref_ref, recurse + 1, pretty); |
| 275 | } |
| 276 | else |
| 277 | fputs_filtered ("???", stream); |
| 278 | } |
| 279 | break; |
| 280 | |
| 281 | case TYPE_CODE_UNION: |
| 282 | if (recurse && !unionprint) |
| 283 | { |
| 284 | fprintf_filtered (stream, "{...}"); |
| 285 | break; |
| 286 | } |
| 287 | /* Fall through. */ |
| 288 | case TYPE_CODE_STRUCT: |
| 289 | if (vtblprint && cp_is_vtbl_ptr_type(type)) |
| 290 | { |
| 291 | /* Print the unmangled name if desired. */ |
| 292 | print_address_demangle(*((int *) (valaddr + /* FIXME bytesex */ |
| 293 | TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8)), |
| 294 | stream, demangle); |
| 295 | break; |
| 296 | } |
| 297 | cp_print_value_fields (type, valaddr, stream, format, recurse, pretty, |
| 298 | 0); |
| 299 | break; |
| 300 | |
| 301 | case TYPE_CODE_ENUM: |
| 302 | if (format) |
| 303 | { |
| 304 | print_scalar_formatted (valaddr, type, format, 0, stream); |
| 305 | break; |
| 306 | } |
| 307 | len = TYPE_NFIELDS (type); |
| 308 | val = unpack_long (type, valaddr); |
| 309 | for (i = 0; i < len; i++) |
| 310 | { |
| 311 | QUIT; |
| 312 | if (val == TYPE_FIELD_BITPOS (type, i)) |
| 313 | { |
| 314 | break; |
| 315 | } |
| 316 | } |
| 317 | if (i < len) |
| 318 | { |
| 319 | fputs_filtered (TYPE_FIELD_NAME (type, i), stream); |
| 320 | } |
| 321 | else |
| 322 | { |
| 323 | print_longest (stream, 'd', 0, val); |
| 324 | } |
| 325 | break; |
| 326 | |
| 327 | case TYPE_CODE_FUNC: |
| 328 | if (format) |
| 329 | { |
| 330 | print_scalar_formatted (valaddr, type, format, 0, stream); |
| 331 | break; |
| 332 | } |
| 333 | /* FIXME, we should consider, at least for ANSI C language, eliminating |
| 334 | the distinction made between FUNCs and POINTERs to FUNCs. */ |
| 335 | fprintf_filtered (stream, "{"); |
| 336 | type_print (type, "", stream, -1); |
| 337 | fprintf_filtered (stream, "} "); |
| 338 | /* Try to print what function it points to, and its address. */ |
| 339 | print_address_demangle (address, stream, demangle); |
| 340 | break; |
| 341 | |
| 342 | case TYPE_CODE_BOOL: |
| 343 | /* Do something at least vaguely reasonable, for example if the |
| 344 | language is set wrong. */ |
| 345 | |
| 346 | case TYPE_CODE_RANGE: |
| 347 | /* FIXME: create_range_type does not set the unsigned bit in a |
| 348 | range type (I think it probably should copy it from the target |
| 349 | type), so we won't print values which are too large to |
| 350 | fit in a signed integer correctly. */ |
| 351 | /* FIXME: Doesn't handle ranges of enums correctly. (Can't just |
| 352 | print with the target type, though, because the size of our type |
| 353 | and the target type might differ). */ |
| 354 | /* FALLTHROUGH */ |
| 355 | |
| 356 | case TYPE_CODE_INT: |
| 357 | format = format ? format : output_format; |
| 358 | if (format) |
| 359 | { |
| 360 | print_scalar_formatted (valaddr, type, format, 0, stream); |
| 361 | } |
| 362 | else |
| 363 | { |
| 364 | val_print_type_code_int (type, valaddr, stream); |
| 365 | /* C and C++ has no single byte int type, char is used instead. |
| 366 | Since we don't know whether the value is really intended to |
| 367 | be used as an integer or a character, print the character |
| 368 | equivalent as well. */ |
| 369 | if (TYPE_LENGTH (type) == 1) |
| 370 | { |
| 371 | fputs_filtered (" ", stream); |
| 372 | LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr), |
| 373 | stream); |
| 374 | } |
| 375 | } |
| 376 | break; |
| 377 | |
| 378 | case TYPE_CODE_CHAR: |
| 379 | format = format ? format : output_format; |
| 380 | if (format) |
| 381 | { |
| 382 | print_scalar_formatted (valaddr, type, format, 0, stream); |
| 383 | } |
| 384 | else |
| 385 | { |
| 386 | fprintf_filtered (stream, TYPE_UNSIGNED (type) ? "%u" : "%d", |
| 387 | unpack_long (type, valaddr)); |
| 388 | fputs_filtered (" ", stream); |
| 389 | LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr), stream); |
| 390 | } |
| 391 | break; |
| 392 | |
| 393 | case TYPE_CODE_FLT: |
| 394 | if (format) |
| 395 | { |
| 396 | print_scalar_formatted (valaddr, type, format, 0, stream); |
| 397 | } |
| 398 | else |
| 399 | { |
| 400 | print_floating (valaddr, type, stream); |
| 401 | } |
| 402 | break; |
| 403 | |
| 404 | case TYPE_CODE_VOID: |
| 405 | fprintf_filtered (stream, "void"); |
| 406 | break; |
| 407 | |
| 408 | case TYPE_CODE_ERROR: |
| 409 | fprintf_filtered (stream, "<error type>"); |
| 410 | break; |
| 411 | |
| 412 | case TYPE_CODE_UNDEF: |
| 413 | /* This happens (without TYPE_FLAG_STUB set) on systems which don't use |
| 414 | dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar" |
| 415 | and no complete type for struct foo in that file. */ |
| 416 | fprintf_filtered (stream, "<incomplete type>"); |
| 417 | break; |
| 418 | |
| 419 | default: |
| 420 | error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type)); |
| 421 | } |
| 422 | gdb_flush (stream); |
| 423 | return (0); |
| 424 | } |