1 /* C language support routines for GDB, the GNU debugger. 2 Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2002, 2003, 2004 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., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22 #include "defs.h" 23 #include "symtab.h" 24 #include "gdbtypes.h" 25 #include "expression.h" 26 #include "parser-defs.h" 27 #include "language.h" 28 #include "c-lang.h" 29 #include "valprint.h" 30 #include "macroscope.h" 31 #include "gdb_assert.h" 32 #include "charset.h" 33 #include "gdb_string.h" 34 #include "demangle.h" 35 #include "cp-support.h" 36 37 extern void _initialize_c_language (void); 38 static void c_emit_char (int c, struct ui_file * stream, int quoter); 39 40 /* Print the character C on STREAM as part of the contents of a literal 41 string whose delimiter is QUOTER. Note that that format for printing 42 characters and strings is language specific. */ 43 44 static void 45 c_emit_char (int c, struct ui_file *stream, int quoter) 46 { 47 const char *escape; 48 int host_char; 49 50 c &= 0xFF; /* Avoid sign bit follies */ 51 52 escape = c_target_char_has_backslash_escape (c); 53 if (escape) 54 { 55 if (quoter == '"' && strcmp (escape, "0") == 0) 56 /* Print nulls embedded in double quoted strings as \000 to 57 prevent ambiguity. */ 58 fprintf_filtered (stream, "\\000"); 59 else 60 fprintf_filtered (stream, "\\%s", escape); 61 } 62 else if (target_char_to_host (c, &host_char) 63 && host_char_print_literally (host_char)) 64 { 65 if (host_char == '\\' || host_char == quoter) 66 fputs_filtered ("\\", stream); 67 fprintf_filtered (stream, "%c", host_char); 68 } 69 else 70 fprintf_filtered (stream, "\\%.3o", (unsigned int) c); 71 } 72 73 void 74 c_printchar (int c, struct ui_file *stream) 75 { 76 fputc_filtered ('\'', stream); 77 LA_EMIT_CHAR (c, stream, '\''); 78 fputc_filtered ('\'', stream); 79 } 80 81 /* Print the character string STRING, printing at most LENGTH characters. 82 LENGTH is -1 if the string is nul terminated. Each character is WIDTH bytes 83 long. Printing stops early if the number hits print_max; repeat counts are 84 printed as appropriate. Print ellipses at the end if we had to stop before 85 printing LENGTH characters, or if FORCE_ELLIPSES. */ 86 87 void 88 c_printstr (struct ui_file *stream, char *string, unsigned int length, 89 int width, int force_ellipses) 90 { 91 unsigned int i; 92 unsigned int things_printed = 0; 93 int in_quotes = 0; 94 int need_comma = 0; 95 96 /* If the string was not truncated due to `set print elements', and 97 the last byte of it is a null, we don't print that, in traditional C 98 style. */ 99 if (!force_ellipses 100 && length > 0 101 && (extract_unsigned_integer (string + (length - 1) * width, width) 102 == '\0')) 103 length--; 104 105 if (length == 0) 106 { 107 fputs_filtered ("\"\"", stream); 108 return; 109 } 110 111 for (i = 0; i < length && things_printed < print_max; ++i) 112 { 113 /* Position of the character we are examining 114 to see whether it is repeated. */ 115 unsigned int rep1; 116 /* Number of repetitions we have detected so far. */ 117 unsigned int reps; 118 unsigned long current_char; 119 120 QUIT; 121 122 if (need_comma) 123 { 124 fputs_filtered (", ", stream); 125 need_comma = 0; 126 } 127 128 current_char = extract_unsigned_integer (string + i * width, width); 129 130 rep1 = i + 1; 131 reps = 1; 132 while (rep1 < length 133 && extract_unsigned_integer (string + rep1 * width, width) 134 == current_char) 135 { 136 ++rep1; 137 ++reps; 138 } 139 140 if (reps > repeat_count_threshold) 141 { 142 if (in_quotes) 143 { 144 if (inspect_it) 145 fputs_filtered ("\\\", ", stream); 146 else 147 fputs_filtered ("\", ", stream); 148 in_quotes = 0; 149 } 150 LA_PRINT_CHAR (current_char, stream); 151 fprintf_filtered (stream, " <repeats %u times>", reps); 152 i = rep1 - 1; 153 things_printed += repeat_count_threshold; 154 need_comma = 1; 155 } 156 else 157 { 158 if (!in_quotes) 159 { 160 if (inspect_it) 161 fputs_filtered ("\\\"", stream); 162 else 163 fputs_filtered ("\"", stream); 164 in_quotes = 1; 165 } 166 LA_EMIT_CHAR (current_char, stream, '"'); 167 ++things_printed; 168 } 169 } 170 171 /* Terminate the quotes if necessary. */ 172 if (in_quotes) 173 { 174 if (inspect_it) 175 fputs_filtered ("\\\"", stream); 176 else 177 fputs_filtered ("\"", stream); 178 } 179 180 if (force_ellipses || i < length) 181 fputs_filtered ("...", stream); 182 } 183 184 /* Create a fundamental C type using default reasonable for the current 185 target machine. 186 187 Some object/debugging file formats (DWARF version 1, COFF, etc) do not 188 define fundamental types such as "int" or "double". Others (stabs or 189 DWARF version 2, etc) do define fundamental types. For the formats which 190 don't provide fundamental types, gdb can create such types using this 191 function. 192 193 FIXME: Some compilers distinguish explicitly signed integral types 194 (signed short, signed int, signed long) from "regular" integral types 195 (short, int, long) in the debugging information. There is some dis- 196 agreement as to how useful this feature is. In particular, gcc does 197 not support this. Also, only some debugging formats allow the 198 distinction to be passed on to a debugger. For now, we always just 199 use "short", "int", or "long" as the type name, for both the implicit 200 and explicitly signed types. This also makes life easier for the 201 gdb test suite since we don't have to account for the differences 202 in output depending upon what the compiler and debugging format 203 support. We will probably have to re-examine the issue when gdb 204 starts taking it's fundamental type information directly from the 205 debugging information supplied by the compiler. fnf@cygnus.com */ 206 207 struct type * 208 c_create_fundamental_type (struct objfile *objfile, int typeid) 209 { 210 struct type *type = NULL; 211 212 switch (typeid) 213 { 214 default: 215 /* FIXME: For now, if we are asked to produce a type not in this 216 language, create the equivalent of a C integer type with the 217 name "<?type?>". When all the dust settles from the type 218 reconstruction work, this should probably become an error. */ 219 type = init_type (TYPE_CODE_INT, 220 TARGET_INT_BIT / TARGET_CHAR_BIT, 221 0, "<?type?>", objfile); 222 warning ("internal error: no C/C++ fundamental type %d", typeid); 223 break; 224 case FT_VOID: 225 type = init_type (TYPE_CODE_VOID, 226 TARGET_CHAR_BIT / TARGET_CHAR_BIT, 227 0, "void", objfile); 228 break; 229 case FT_BOOLEAN: 230 type = init_type (TYPE_CODE_BOOL, 231 TARGET_CHAR_BIT / TARGET_CHAR_BIT, 232 0, "bool", objfile); 233 break; 234 case FT_CHAR: 235 type = init_type (TYPE_CODE_INT, 236 TARGET_CHAR_BIT / TARGET_CHAR_BIT, 237 TYPE_FLAG_NOSIGN, "char", objfile); 238 break; 239 case FT_SIGNED_CHAR: 240 type = init_type (TYPE_CODE_INT, 241 TARGET_CHAR_BIT / TARGET_CHAR_BIT, 242 0, "signed char", objfile); 243 break; 244 case FT_UNSIGNED_CHAR: 245 type = init_type (TYPE_CODE_INT, 246 TARGET_CHAR_BIT / TARGET_CHAR_BIT, 247 TYPE_FLAG_UNSIGNED, "unsigned char", objfile); 248 break; 249 case FT_SHORT: 250 type = init_type (TYPE_CODE_INT, 251 TARGET_SHORT_BIT / TARGET_CHAR_BIT, 252 0, "short", objfile); 253 break; 254 case FT_SIGNED_SHORT: 255 type = init_type (TYPE_CODE_INT, 256 TARGET_SHORT_BIT / TARGET_CHAR_BIT, 257 0, "short", objfile); /* FIXME-fnf */ 258 break; 259 case FT_UNSIGNED_SHORT: 260 type = init_type (TYPE_CODE_INT, 261 TARGET_SHORT_BIT / TARGET_CHAR_BIT, 262 TYPE_FLAG_UNSIGNED, "unsigned short", objfile); 263 break; 264 case FT_INTEGER: 265 type = init_type (TYPE_CODE_INT, 266 TARGET_INT_BIT / TARGET_CHAR_BIT, 267 0, "int", objfile); 268 break; 269 case FT_SIGNED_INTEGER: 270 type = init_type (TYPE_CODE_INT, 271 TARGET_INT_BIT / TARGET_CHAR_BIT, 272 0, "int", objfile); /* FIXME -fnf */ 273 break; 274 case FT_UNSIGNED_INTEGER: 275 type = init_type (TYPE_CODE_INT, 276 TARGET_INT_BIT / TARGET_CHAR_BIT, 277 TYPE_FLAG_UNSIGNED, "unsigned int", objfile); 278 break; 279 case FT_LONG: 280 type = init_type (TYPE_CODE_INT, 281 TARGET_LONG_BIT / TARGET_CHAR_BIT, 282 0, "long", objfile); 283 break; 284 case FT_SIGNED_LONG: 285 type = init_type (TYPE_CODE_INT, 286 TARGET_LONG_BIT / TARGET_CHAR_BIT, 287 0, "long", objfile); /* FIXME -fnf */ 288 break; 289 case FT_UNSIGNED_LONG: 290 type = init_type (TYPE_CODE_INT, 291 TARGET_LONG_BIT / TARGET_CHAR_BIT, 292 TYPE_FLAG_UNSIGNED, "unsigned long", objfile); 293 break; 294 case FT_LONG_LONG: 295 type = init_type (TYPE_CODE_INT, 296 TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, 297 0, "long long", objfile); 298 break; 299 case FT_SIGNED_LONG_LONG: 300 type = init_type (TYPE_CODE_INT, 301 TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, 302 0, "signed long long", objfile); 303 break; 304 case FT_UNSIGNED_LONG_LONG: 305 type = init_type (TYPE_CODE_INT, 306 TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, 307 TYPE_FLAG_UNSIGNED, "unsigned long long", objfile); 308 break; 309 case FT_FLOAT: 310 type = init_type (TYPE_CODE_FLT, 311 TARGET_FLOAT_BIT / TARGET_CHAR_BIT, 312 0, "float", objfile); 313 break; 314 case FT_DBL_PREC_FLOAT: 315 type = init_type (TYPE_CODE_FLT, 316 TARGET_DOUBLE_BIT / TARGET_CHAR_BIT, 317 0, "double", objfile); 318 break; 319 case FT_EXT_PREC_FLOAT: 320 type = init_type (TYPE_CODE_FLT, 321 TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT, 322 0, "long double", objfile); 323 break; 324 case FT_COMPLEX: 325 type = init_type (TYPE_CODE_FLT, 326 2 * TARGET_FLOAT_BIT / TARGET_CHAR_BIT, 327 0, "complex float", objfile); 328 TYPE_TARGET_TYPE (type) 329 = init_type (TYPE_CODE_FLT, TARGET_FLOAT_BIT / TARGET_CHAR_BIT, 330 0, "float", objfile); 331 break; 332 case FT_DBL_PREC_COMPLEX: 333 type = init_type (TYPE_CODE_FLT, 334 2 * TARGET_DOUBLE_BIT / TARGET_CHAR_BIT, 335 0, "complex double", objfile); 336 TYPE_TARGET_TYPE (type) 337 = init_type (TYPE_CODE_FLT, TARGET_DOUBLE_BIT / TARGET_CHAR_BIT, 338 0, "double", objfile); 339 break; 340 case FT_EXT_PREC_COMPLEX: 341 type = init_type (TYPE_CODE_FLT, 342 2 * TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT, 343 0, "complex long double", objfile); 344 TYPE_TARGET_TYPE (type) 345 = init_type (TYPE_CODE_FLT, TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT, 346 0, "long double", objfile); 347 break; 348 case FT_TEMPLATE_ARG: 349 type = init_type (TYPE_CODE_TEMPLATE_ARG, 350 0, 351 0, "<template arg>", objfile); 352 break; 353 } 354 return (type); 355 } 356 357 /* Preprocessing and parsing C and C++ expressions. */ 358 359 360 /* When we find that lexptr (the global var defined in parse.c) is 361 pointing at a macro invocation, we expand the invocation, and call 362 scan_macro_expansion to save the old lexptr here and point lexptr 363 into the expanded text. When we reach the end of that, we call 364 end_macro_expansion to pop back to the value we saved here. The 365 macro expansion code promises to return only fully-expanded text, 366 so we don't need to "push" more than one level. 367 368 This is disgusting, of course. It would be cleaner to do all macro 369 expansion beforehand, and then hand that to lexptr. But we don't 370 really know where the expression ends. Remember, in a command like 371 372 (gdb) break *ADDRESS if CONDITION 373 374 we evaluate ADDRESS in the scope of the current frame, but we 375 evaluate CONDITION in the scope of the breakpoint's location. So 376 it's simply wrong to try to macro-expand the whole thing at once. */ 377 static char *macro_original_text; 378 static char *macro_expanded_text; 379 380 381 void 382 scan_macro_expansion (char *expansion) 383 { 384 /* We'd better not be trying to push the stack twice. */ 385 gdb_assert (! macro_original_text); 386 gdb_assert (! macro_expanded_text); 387 388 /* Save the old lexptr value, so we can return to it when we're done 389 parsing the expanded text. */ 390 macro_original_text = lexptr; 391 lexptr = expansion; 392 393 /* Save the expanded text, so we can free it when we're finished. */ 394 macro_expanded_text = expansion; 395 } 396 397 398 int 399 scanning_macro_expansion (void) 400 { 401 return macro_original_text != 0; 402 } 403 404 405 void 406 finished_macro_expansion (void) 407 { 408 /* There'd better be something to pop back to, and we better have 409 saved a pointer to the start of the expanded text. */ 410 gdb_assert (macro_original_text); 411 gdb_assert (macro_expanded_text); 412 413 /* Pop back to the original text. */ 414 lexptr = macro_original_text; 415 macro_original_text = 0; 416 417 /* Free the expanded text. */ 418 xfree (macro_expanded_text); 419 macro_expanded_text = 0; 420 } 421 422 423 static void 424 scan_macro_cleanup (void *dummy) 425 { 426 if (macro_original_text) 427 finished_macro_expansion (); 428 } 429 430 431 /* We set these global variables before calling c_parse, to tell it 432 how it to find macro definitions for the expression at hand. */ 433 macro_lookup_ftype *expression_macro_lookup_func; 434 void *expression_macro_lookup_baton; 435 436 437 static struct macro_definition * 438 null_macro_lookup (const char *name, void *baton) 439 { 440 return 0; 441 } 442 443 444 static int 445 c_preprocess_and_parse (void) 446 { 447 /* Set up a lookup function for the macro expander. */ 448 struct macro_scope *scope = 0; 449 struct cleanup *back_to = make_cleanup (free_current_contents, &scope); 450 451 if (expression_context_block) 452 scope = sal_macro_scope (find_pc_line (expression_context_pc, 0)); 453 else 454 scope = default_macro_scope (); 455 456 if (scope) 457 { 458 expression_macro_lookup_func = standard_macro_lookup; 459 expression_macro_lookup_baton = (void *) scope; 460 } 461 else 462 { 463 expression_macro_lookup_func = null_macro_lookup; 464 expression_macro_lookup_baton = 0; 465 } 466 467 gdb_assert (! macro_original_text); 468 make_cleanup (scan_macro_cleanup, 0); 469 470 { 471 int result = c_parse (); 472 do_cleanups (back_to); 473 return result; 474 } 475 } 476 477 478 479 /* Table mapping opcodes into strings for printing operators 480 and precedences of the operators. */ 481 482 const struct op_print c_op_print_tab[] = 483 { 484 {",", BINOP_COMMA, PREC_COMMA, 0}, 485 {"=", BINOP_ASSIGN, PREC_ASSIGN, 1}, 486 {"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, 487 {"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, 488 {"|", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, 489 {"^", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, 490 {"&", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, 491 {"==", BINOP_EQUAL, PREC_EQUAL, 0}, 492 {"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0}, 493 {"<=", BINOP_LEQ, PREC_ORDER, 0}, 494 {">=", BINOP_GEQ, PREC_ORDER, 0}, 495 {">", BINOP_GTR, PREC_ORDER, 0}, 496 {"<", BINOP_LESS, PREC_ORDER, 0}, 497 {">>", BINOP_RSH, PREC_SHIFT, 0}, 498 {"<<", BINOP_LSH, PREC_SHIFT, 0}, 499 {"+", BINOP_ADD, PREC_ADD, 0}, 500 {"-", BINOP_SUB, PREC_ADD, 0}, 501 {"*", BINOP_MUL, PREC_MUL, 0}, 502 {"/", BINOP_DIV, PREC_MUL, 0}, 503 {"%", BINOP_REM, PREC_MUL, 0}, 504 {"@", BINOP_REPEAT, PREC_REPEAT, 0}, 505 {"-", UNOP_NEG, PREC_PREFIX, 0}, 506 {"!", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, 507 {"~", UNOP_COMPLEMENT, PREC_PREFIX, 0}, 508 {"*", UNOP_IND, PREC_PREFIX, 0}, 509 {"&", UNOP_ADDR, PREC_PREFIX, 0}, 510 {"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0}, 511 {"++", UNOP_PREINCREMENT, PREC_PREFIX, 0}, 512 {"--", UNOP_PREDECREMENT, PREC_PREFIX, 0}, 513 {NULL, 0, 0, 0} 514 }; 515 516 struct type **const (c_builtin_types[]) = 517 { 518 &builtin_type_int, 519 &builtin_type_long, 520 &builtin_type_short, 521 &builtin_type_char, 522 &builtin_type_float, 523 &builtin_type_double, 524 &builtin_type_void, 525 &builtin_type_long_long, 526 &builtin_type_signed_char, 527 &builtin_type_unsigned_char, 528 &builtin_type_unsigned_short, 529 &builtin_type_unsigned_int, 530 &builtin_type_unsigned_long, 531 &builtin_type_unsigned_long_long, 532 &builtin_type_long_double, 533 &builtin_type_complex, 534 &builtin_type_double_complex, 535 0 536 }; 537 538 const struct language_defn c_language_defn = 539 { 540 "c", /* Language name */ 541 language_c, 542 c_builtin_types, 543 range_check_off, 544 type_check_off, 545 case_sensitive_on, 546 &exp_descriptor_standard, 547 c_preprocess_and_parse, 548 c_error, 549 c_printchar, /* Print a character constant */ 550 c_printstr, /* Function to print string constant */ 551 c_emit_char, /* Print a single char */ 552 c_create_fundamental_type, /* Create fundamental type in this language */ 553 c_print_type, /* Print a type using appropriate syntax */ 554 c_val_print, /* Print a value using appropriate syntax */ 555 c_value_print, /* Print a top-level value */ 556 NULL, /* Language specific skip_trampoline */ 557 NULL, /* value_of_this */ 558 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ 559 basic_lookup_transparent_type,/* lookup_transparent_type */ 560 NULL, /* Language specific symbol demangler */ 561 {"", "", "", ""}, /* Binary format info */ 562 {"0%lo", "0", "o", ""}, /* Octal format info */ 563 {"%ld", "", "d", ""}, /* Decimal format info */ 564 {"0x%lx", "0x", "x", ""}, /* Hex format info */ 565 c_op_print_tab, /* expression operators for printing */ 566 1, /* c-style arrays */ 567 0, /* String lower bound */ 568 &builtin_type_char, /* Type of string elements */ 569 default_word_break_characters, 570 LANG_MAGIC 571 }; 572 573 struct type **const (cplus_builtin_types[]) = 574 { 575 &builtin_type_int, 576 &builtin_type_long, 577 &builtin_type_short, 578 &builtin_type_char, 579 &builtin_type_float, 580 &builtin_type_double, 581 &builtin_type_void, 582 &builtin_type_long_long, 583 &builtin_type_signed_char, 584 &builtin_type_unsigned_char, 585 &builtin_type_unsigned_short, 586 &builtin_type_unsigned_int, 587 &builtin_type_unsigned_long, 588 &builtin_type_unsigned_long_long, 589 &builtin_type_long_double, 590 &builtin_type_complex, 591 &builtin_type_double_complex, 592 &builtin_type_bool, 593 0 594 }; 595 596 /* without this stub function, alpha attempts to generate a 597 * text relocation for the function pointer instead of a PLT reference. 598 */ 599 static char *call_cplus_demangle (const char *mangled, int options); 600 static char * 601 call_cplus_demangle (const char *mangled, int options) 602 { 603 return cplus_demangle(mangled, options); 604 } 605 606 const struct language_defn cplus_language_defn = 607 { 608 "c++", /* Language name */ 609 language_cplus, 610 cplus_builtin_types, 611 range_check_off, 612 type_check_off, 613 case_sensitive_on, 614 &exp_descriptor_standard, 615 c_preprocess_and_parse, 616 c_error, 617 c_printchar, /* Print a character constant */ 618 c_printstr, /* Function to print string constant */ 619 c_emit_char, /* Print a single char */ 620 c_create_fundamental_type, /* Create fundamental type in this language */ 621 c_print_type, /* Print a type using appropriate syntax */ 622 c_val_print, /* Print a value using appropriate syntax */ 623 c_value_print, /* Print a top-level value */ 624 NULL, /* Language specific skip_trampoline */ 625 value_of_this, /* value_of_this */ 626 cp_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ 627 cp_lookup_transparent_type, /* lookup_transparent_type */ 628 call_cplus_demangle, /* Language specific symbol demangler */ 629 {"", "", "", ""}, /* Binary format info */ 630 {"0%lo", "0", "o", ""}, /* Octal format info */ 631 {"%ld", "", "d", ""}, /* Decimal format info */ 632 {"0x%lx", "0x", "x", ""}, /* Hex format info */ 633 c_op_print_tab, /* expression operators for printing */ 634 1, /* c-style arrays */ 635 0, /* String lower bound */ 636 &builtin_type_char, /* Type of string elements */ 637 default_word_break_characters, 638 LANG_MAGIC 639 }; 640 641 const struct language_defn asm_language_defn = 642 { 643 "asm", /* Language name */ 644 language_asm, 645 c_builtin_types, 646 range_check_off, 647 type_check_off, 648 case_sensitive_on, 649 &exp_descriptor_standard, 650 c_preprocess_and_parse, 651 c_error, 652 c_printchar, /* Print a character constant */ 653 c_printstr, /* Function to print string constant */ 654 c_emit_char, /* Print a single char */ 655 c_create_fundamental_type, /* Create fundamental type in this language */ 656 c_print_type, /* Print a type using appropriate syntax */ 657 c_val_print, /* Print a value using appropriate syntax */ 658 c_value_print, /* Print a top-level value */ 659 NULL, /* Language specific skip_trampoline */ 660 NULL, /* value_of_this */ 661 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ 662 basic_lookup_transparent_type,/* lookup_transparent_type */ 663 NULL, /* Language specific symbol demangler */ 664 {"", "", "", ""}, /* Binary format info */ 665 {"0%lo", "0", "o", ""}, /* Octal format info */ 666 {"%ld", "", "d", ""}, /* Decimal format info */ 667 {"0x%lx", "0x", "x", ""}, /* Hex format info */ 668 c_op_print_tab, /* expression operators for printing */ 669 1, /* c-style arrays */ 670 0, /* String lower bound */ 671 &builtin_type_char, /* Type of string elements */ 672 default_word_break_characters, 673 LANG_MAGIC 674 }; 675 676 /* The following language_defn does not represent a real language. 677 It just provides a minimal support a-la-C that should allow users 678 to do some simple operations when debugging applications that use 679 a language currently not supported by GDB. */ 680 681 const struct language_defn minimal_language_defn = 682 { 683 "minimal", /* Language name */ 684 language_minimal, 685 c_builtin_types, 686 range_check_off, 687 type_check_off, 688 case_sensitive_on, 689 &exp_descriptor_standard, 690 c_preprocess_and_parse, 691 c_error, 692 c_printchar, /* Print a character constant */ 693 c_printstr, /* Function to print string constant */ 694 c_emit_char, /* Print a single char */ 695 c_create_fundamental_type, /* Create fundamental type in this language */ 696 c_print_type, /* Print a type using appropriate syntax */ 697 c_val_print, /* Print a value using appropriate syntax */ 698 c_value_print, /* Print a top-level value */ 699 NULL, /* Language specific skip_trampoline */ 700 NULL, /* value_of_this */ 701 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ 702 basic_lookup_transparent_type,/* lookup_transparent_type */ 703 NULL, /* Language specific symbol demangler */ 704 {"", "", "", ""}, /* Binary format info */ 705 {"0%lo", "0", "o", ""}, /* Octal format info */ 706 {"%ld", "", "d", ""}, /* Decimal format info */ 707 {"0x%lx", "0x", "x", ""}, /* Hex format info */ 708 c_op_print_tab, /* expression operators for printing */ 709 1, /* c-style arrays */ 710 0, /* String lower bound */ 711 &builtin_type_char, /* Type of string elements */ 712 default_word_break_characters, 713 LANG_MAGIC 714 }; 715 716 void 717 _initialize_c_language (void) 718 { 719 add_language (&c_language_defn); 720 add_language (&cplus_language_defn); 721 add_language (&asm_language_defn); 722 add_language (&minimal_language_defn); 723 } 724