1/* Print and select stack frames for GDB, the GNU debugger. 2 3 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 4 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free 5 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 2 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, write to the Free Software 21 Foundation, Inc., 59 Temple Place - Suite 330, 22 Boston, MA 02111-1307, USA. */ 23 24#include <ctype.h> 25#include "defs.h" 26#include "gdb_string.h" 27#include "value.h" 28#include "symtab.h" 29#include "gdbtypes.h" 30#include "expression.h" 31#include "language.h" 32#include "frame.h" 33#include "gdbcmd.h" 34#include "gdbcore.h" 35#include "target.h" 36#include "source.h" 37#include "breakpoint.h" 38#include "demangle.h" 39#include "inferior.h" 40#include "annotate.h" 41#include "ui-out.h" 42#include "block.h" 43#include "stack.h" 44#include "gdb_assert.h" 45#include "dictionary.h" 46#include "reggroups.h" 47#include "regcache.h" 48 49/* Prototypes for exported functions. */ 50 51void args_info (char *, int); 52 53void locals_info (char *, int); 54 55void (*selected_frame_level_changed_hook) (int); 56 57void _initialize_stack (void); 58 59/* Prototypes for local functions. */ 60 61static void down_command (char *, int); 62 63static void down_silently_base (char *); 64 65static void down_silently_command (char *, int); 66 67static void up_command (char *, int); 68 69static void up_silently_base (char *); 70 71static void up_silently_command (char *, int); 72 73void frame_command (char *, int); 74 75static void current_frame_command (char *, int); 76 77static void print_frame_arg_vars (struct frame_info *, struct ui_file *); 78 79static void catch_info (char *, int); 80 81static void args_plus_locals_info (char *, int); 82 83static void print_frame_label_vars (struct frame_info *, int, 84 struct ui_file *); 85 86static void print_frame_local_vars (struct frame_info *, int, 87 struct ui_file *); 88 89static int print_block_frame_labels (struct block *, int *, 90 struct ui_file *); 91 92static int print_block_frame_locals (struct block *, 93 struct frame_info *, 94 int, 95 struct ui_file *); 96 97static void print_frame (struct frame_info *fi, 98 int level, 99 int source, 100 int args, 101 struct symtab_and_line sal); 102 103static void backtrace_command (char *, int); 104 105struct frame_info *parse_frame_specification (char *); 106 107static void frame_info (char *, int); 108 109extern int addressprint; /* Print addresses, or stay symbolic only? */ 110 111/* Zero means do things normally; we are interacting directly with the 112 user. One means print the full filename and linenumber when a 113 frame is printed, and do so in a format emacs18/emacs19.22 can 114 parse. Two means print similar annotations, but in many more 115 cases and in a slightly different syntax. */ 116 117int annotation_level = 0; 118 119 120struct print_stack_frame_args 121 { 122 struct frame_info *fi; 123 int level; 124 int source; 125 int args; 126 }; 127 128/* Show or print the frame arguments. 129 Pass the args the way catch_errors wants them. */ 130static int print_stack_frame_stub (void *args); 131static int 132print_stack_frame_stub (void *args) 133{ 134 struct print_stack_frame_args *p = (struct print_stack_frame_args *) args; 135 136 print_frame_info (p->fi, p->level, p->source, p->args); 137 return 0; 138} 139 140/* Show or print a stack frame briefly. FRAME_INFI should be the frame info 141 and LEVEL should be its level in the stack (or -1 for level not defined). 142 This prints the level, the function executing, the arguments, 143 and the file name and line number. 144 If the pc is not at the beginning of the source line, 145 the actual pc is printed at the beginning. 146 147 If SOURCE is 1, print the source line as well. 148 If SOURCE is -1, print ONLY the source line. */ 149 150void 151print_stack_frame (struct frame_info *fi, int level, int source) 152{ 153 struct print_stack_frame_args args; 154 155 args.fi = fi; 156 args.level = level; 157 args.source = source; 158 args.args = 1; 159 160 catch_errors (print_stack_frame_stub, (char *) &args, "", RETURN_MASK_ALL); 161} 162 163struct print_args_args 164{ 165 struct symbol *func; 166 struct frame_info *fi; 167 struct ui_file *stream; 168}; 169 170static int print_args_stub (void *); 171 172/* Print nameless args on STREAM. 173 FI is the frameinfo for this frame, START is the offset 174 of the first nameless arg, and NUM is the number of nameless args to 175 print. FIRST is nonzero if this is the first argument (not just 176 the first nameless arg). */ 177 178static void 179print_frame_nameless_args (struct frame_info *fi, long start, int num, 180 int first, struct ui_file *stream) 181{ 182 int i; 183 CORE_ADDR argsaddr; 184 long arg_value; 185 186 for (i = 0; i < num; i++) 187 { 188 QUIT; 189 argsaddr = get_frame_args_address (fi); 190 if (!argsaddr) 191 return; 192 arg_value = read_memory_integer (argsaddr + start, sizeof (int)); 193 if (!first) 194 fprintf_filtered (stream, ", "); 195 fprintf_filtered (stream, "%ld", arg_value); 196 first = 0; 197 start += sizeof (int); 198 } 199} 200 201/* Print the arguments of a stack frame, given the function FUNC 202 running in that frame (as a symbol), the info on the frame, 203 and the number of args according to the stack frame (or -1 if unknown). */ 204 205/* References here and elsewhere to "number of args according to the 206 stack frame" appear in all cases to refer to "number of ints of args 207 according to the stack frame". At least for VAX, i386, isi. */ 208 209static void 210print_frame_args (struct symbol *func, struct frame_info *fi, int num, 211 struct ui_file *stream) 212{ 213 struct block *b = NULL; 214 int first = 1; 215 struct dict_iterator iter; 216 struct symbol *sym; 217 struct value *val; 218 /* Offset of next stack argument beyond the one we have seen that is 219 at the highest offset. 220 -1 if we haven't come to a stack argument yet. */ 221 long highest_offset = -1; 222 int arg_size; 223 /* Number of ints of arguments that we have printed so far. */ 224 int args_printed = 0; 225 struct cleanup *old_chain, *list_chain; 226 struct ui_stream *stb; 227 228 stb = ui_out_stream_new (uiout); 229 old_chain = make_cleanup_ui_out_stream_delete (stb); 230 231 if (func) 232 { 233 b = SYMBOL_BLOCK_VALUE (func); 234 235 ALL_BLOCK_SYMBOLS (b, iter, sym) 236 { 237 QUIT; 238 239 /* Keep track of the highest stack argument offset seen, and 240 skip over any kinds of symbols we don't care about. */ 241 242 switch (SYMBOL_CLASS (sym)) 243 { 244 case LOC_ARG: 245 case LOC_REF_ARG: 246 { 247 long current_offset = SYMBOL_VALUE (sym); 248 arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym)); 249 250 /* Compute address of next argument by adding the size of 251 this argument and rounding to an int boundary. */ 252 current_offset = 253 ((current_offset + arg_size + sizeof (int) - 1) 254 & ~(sizeof (int) - 1)); 255 256 /* If this is the highest offset seen yet, set highest_offset. */ 257 if (highest_offset == -1 258 || (current_offset > highest_offset)) 259 highest_offset = current_offset; 260 261 /* Add the number of ints we're about to print to args_printed. */ 262 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int); 263 } 264 265 /* We care about types of symbols, but don't need to keep track of 266 stack offsets in them. */ 267 case LOC_REGPARM: 268 case LOC_REGPARM_ADDR: 269 case LOC_LOCAL_ARG: 270 case LOC_BASEREG_ARG: 271 case LOC_COMPUTED_ARG: 272 break; 273 274 /* Other types of symbols we just skip over. */ 275 default: 276 continue; 277 } 278 279 /* We have to look up the symbol because arguments can have 280 two entries (one a parameter, one a local) and the one we 281 want is the local, which lookup_symbol will find for us. 282 This includes gcc1 (not gcc2) on the sparc when passing a 283 small structure and gcc2 when the argument type is float 284 and it is passed as a double and converted to float by 285 the prologue (in the latter case the type of the LOC_ARG 286 symbol is double and the type of the LOC_LOCAL symbol is 287 float). */ 288 /* But if the parameter name is null, don't try it. 289 Null parameter names occur on the RS/6000, for traceback tables. 290 FIXME, should we even print them? */ 291 292 if (*DEPRECATED_SYMBOL_NAME (sym)) 293 { 294 struct symbol *nsym; 295 nsym = lookup_symbol 296 (DEPRECATED_SYMBOL_NAME (sym), 297 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL); 298 if (SYMBOL_CLASS (nsym) == LOC_REGISTER) 299 { 300 /* There is a LOC_ARG/LOC_REGISTER pair. This means that 301 it was passed on the stack and loaded into a register, 302 or passed in a register and stored in a stack slot. 303 GDB 3.x used the LOC_ARG; GDB 4.0-4.11 used the LOC_REGISTER. 304 305 Reasons for using the LOC_ARG: 306 (1) because find_saved_registers may be slow for remote 307 debugging, 308 (2) because registers are often re-used and stack slots 309 rarely (never?) are. Therefore using the stack slot is 310 much less likely to print garbage. 311 312 Reasons why we might want to use the LOC_REGISTER: 313 (1) So that the backtrace prints the same value as 314 "print foo". I see no compelling reason why this needs 315 to be the case; having the backtrace print the value which 316 was passed in, and "print foo" print the value as modified 317 within the called function, makes perfect sense to me. 318 319 Additional note: It might be nice if "info args" displayed 320 both values. 321 One more note: There is a case with sparc structure passing 322 where we need to use the LOC_REGISTER, but this is dealt with 323 by creating a single LOC_REGPARM in symbol reading. */ 324 325 /* Leave sym (the LOC_ARG) alone. */ 326 ; 327 } 328 else 329 sym = nsym; 330 } 331 332 /* Print the current arg. */ 333 if (!first) 334 ui_out_text (uiout, ", "); 335 ui_out_wrap_hint (uiout, " "); 336 337 annotate_arg_begin (); 338 339 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); 340 fprintf_symbol_filtered (stb->stream, SYMBOL_PRINT_NAME (sym), 341 SYMBOL_LANGUAGE (sym), DMGL_PARAMS | DMGL_ANSI); 342 ui_out_field_stream (uiout, "name", stb); 343 annotate_arg_name_end (); 344 ui_out_text (uiout, "="); 345 346 /* Avoid value_print because it will deref ref parameters. We just 347 want to print their addresses. Print ??? for args whose address 348 we do not know. We pass 2 as "recurse" to val_print because our 349 standard indentation here is 4 spaces, and val_print indents 350 2 for each recurse. */ 351 val = read_var_value (sym, fi); 352 353 annotate_arg_value (val == NULL ? NULL : VALUE_TYPE (val)); 354 355 if (val) 356 { 357 common_val_print (val, stb->stream, 0, 0, 2, Val_no_prettyprint); 358 ui_out_field_stream (uiout, "value", stb); 359 } 360 else 361 ui_out_text (uiout, "???"); 362 363 /* Invoke ui_out_tuple_end. */ 364 do_cleanups (list_chain); 365 366 annotate_arg_end (); 367 368 first = 0; 369 } 370 } 371 372 /* Don't print nameless args in situations where we don't know 373 enough about the stack to find them. */ 374 if (num != -1) 375 { 376 long start; 377 378 if (highest_offset == -1) 379 start = FRAME_ARGS_SKIP; 380 else 381 start = highest_offset; 382 383 print_frame_nameless_args (fi, start, num - args_printed, 384 first, stream); 385 } 386 do_cleanups (old_chain); 387} 388 389/* Pass the args the way catch_errors wants them. */ 390 391static int 392print_args_stub (void *args) 393{ 394 int numargs; 395 struct print_args_args *p = (struct print_args_args *) args; 396 397 if (FRAME_NUM_ARGS_P ()) 398 { 399 numargs = FRAME_NUM_ARGS (p->fi); 400 gdb_assert (numargs >= 0); 401 } 402 else 403 numargs = -1; 404 print_frame_args (p->func, p->fi, numargs, p->stream); 405 return 0; 406} 407 408/* Print information about a frame for frame "fi" at level "level". 409 Used in "where" output, also used to emit breakpoint or step 410 messages. 411 LEVEL is the level of the frame, or -1 if it is the 412 innermost frame but we don't want to print the level. 413 The meaning of the SOURCE argument is: 414 SRC_LINE: Print only source line 415 LOCATION: Print only location 416 LOC_AND_SRC: Print location and source line. */ 417 418void 419print_frame_info (struct frame_info *fi, int level, int source, int args) 420{ 421 struct symtab_and_line sal; 422 int source_print; 423 int location_print; 424 425 if (get_frame_type (fi) == DUMMY_FRAME 426 || get_frame_type (fi) == SIGTRAMP_FRAME) 427 { 428 struct cleanup *uiout_cleanup 429 = make_cleanup_ui_out_tuple_begin_end (uiout, "frame"); 430 431 annotate_frame_begin (level == -1 ? 0 : level, get_frame_pc (fi)); 432 433 /* Do this regardless of SOURCE because we don't have any source 434 to list for this frame. */ 435 if (level >= 0) 436 { 437 ui_out_text (uiout, "#"); 438 ui_out_field_fmt_int (uiout, 2, ui_left, "level", level); 439 } 440 if (ui_out_is_mi_like_p (uiout)) 441 { 442 annotate_frame_address (); 443 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi)); 444 annotate_frame_address_end (); 445 } 446 447 if (get_frame_type (fi) == DUMMY_FRAME) 448 { 449 annotate_function_call (); 450 ui_out_field_string (uiout, "func", "<function called from gdb>"); 451 } 452 else if (get_frame_type (fi) == SIGTRAMP_FRAME) 453 { 454 annotate_signal_handler_caller (); 455 ui_out_field_string (uiout, "func", "<signal handler called>"); 456 } 457 ui_out_text (uiout, "\n"); 458 annotate_frame_end (); 459 460 do_cleanups (uiout_cleanup); 461 return; 462 } 463 464 /* If fi is not the innermost frame, that normally means that fi->pc 465 points to *after* the call instruction, and we want to get the 466 line containing the call, never the next line. But if the next 467 frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the next frame 468 was not entered as the result of a call, and we want to get the 469 line containing fi->pc. */ 470 find_frame_sal (fi, &sal); 471 472 location_print = (source == LOCATION 473 || source == LOC_AND_ADDRESS 474 || source == SRC_AND_LOC); 475 476 if (location_print || !sal.symtab) 477 print_frame (fi, level, source, args, sal); 478 479 source_print = (source == SRC_LINE || source == SRC_AND_LOC); 480 481 if (sal.symtab) 482 set_current_source_symtab_and_line (&sal); 483 484 if (source_print && sal.symtab) 485 { 486 struct symtab_and_line cursal; 487 int done = 0; 488 int mid_statement = (source == SRC_LINE) && (get_frame_pc (fi) != sal.pc); 489 490 if (annotation_level) 491 done = identify_source_line (sal.symtab, sal.line, mid_statement, 492 get_frame_pc (fi)); 493 if (!done) 494 { 495 if (print_frame_info_listing_hook) 496 print_frame_info_listing_hook (sal.symtab, sal.line, sal.line + 1, 0); 497 else 498 { 499 /* We used to do this earlier, but that is clearly 500 wrong. This function is used by many different 501 parts of gdb, including normal_stop in infrun.c, 502 which uses this to print out the current PC 503 when we stepi/nexti into the middle of a source 504 line. Only the command line really wants this 505 behavior. Other UIs probably would like the 506 ability to decide for themselves if it is desired. */ 507 if (addressprint && mid_statement) 508 { 509 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi)); 510 ui_out_text (uiout, "\t"); 511 } 512 513 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0); 514 } 515 } 516 /* Make sure we have at least a default source file */ 517 set_default_source_symtab_and_line (); 518 cursal = get_current_source_symtab_and_line (); 519 cursal.line = max (sal.line - get_lines_to_list () / 2, 1); 520 set_current_source_symtab_and_line (&cursal); 521 } 522 523 if (source != 0) 524 set_default_breakpoint (1, get_frame_pc (fi), sal.symtab, sal.line); 525 526 annotate_frame_end (); 527 528 gdb_flush (gdb_stdout); 529} 530 531static void 532print_frame (struct frame_info *fi, 533 int level, 534 int source, 535 int args, 536 struct symtab_and_line sal) 537{ 538 struct symbol *func; 539 char *funname = 0; 540 enum language funlang = language_unknown; 541 struct ui_stream *stb; 542 struct cleanup *old_chain; 543 struct cleanup *list_chain; 544 545 stb = ui_out_stream_new (uiout); 546 old_chain = make_cleanup_ui_out_stream_delete (stb); 547 548 func = find_pc_function (get_frame_address_in_block (fi)); 549 if (func) 550 { 551 /* In certain pathological cases, the symtabs give the wrong 552 function (when we are in the first function in a file which 553 is compiled without debugging symbols, the previous function 554 is compiled with debugging symbols, and the "foo.o" symbol 555 that is supposed to tell us where the file with debugging symbols 556 ends has been truncated by ar because it is longer than 15 557 characters). This also occurs if the user uses asm() to create 558 a function but not stabs for it (in a file compiled -g). 559 560 So look in the minimal symbol tables as well, and if it comes 561 up with a larger address for the function use that instead. 562 I don't think this can ever cause any problems; there shouldn't 563 be any minimal symbols in the middle of a function; if this is 564 ever changed many parts of GDB will need to be changed (and we'll 565 create a find_pc_minimal_function or some such). */ 566 567 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi)); 568 if (msymbol != NULL 569 && (SYMBOL_VALUE_ADDRESS (msymbol) 570 > BLOCK_START (SYMBOL_BLOCK_VALUE (func)))) 571 { 572#if 0 573 /* There is no particular reason to think the line number 574 information is wrong. Someone might have just put in 575 a label with asm() but left the line numbers alone. */ 576 /* In this case we have no way of knowing the source file 577 and line number, so don't print them. */ 578 sal.symtab = 0; 579#endif 580 /* We also don't know anything about the function besides 581 its address and name. */ 582 func = 0; 583 funname = DEPRECATED_SYMBOL_NAME (msymbol); 584 funlang = SYMBOL_LANGUAGE (msymbol); 585 } 586 else 587 { 588 /* I'd like to use SYMBOL_PRINT_NAME() here, to display the 589 demangled name that we already have stored in the symbol 590 table, but we stored a version with DMGL_PARAMS turned 591 on, and here we don't want to display parameters. So call 592 the demangler again, with DMGL_ANSI only. (Yes, I know 593 that printf_symbol_filtered() will again try to demangle 594 the name on the fly, but the issue is that if 595 cplus_demangle() fails here, it'll fail there too. So we 596 want to catch the failure ("demangled==NULL" case below) 597 here, while we still have our hands on the function 598 symbol.) */ 599 char *demangled; 600 funname = DEPRECATED_SYMBOL_NAME (func); 601 funlang = SYMBOL_LANGUAGE (func); 602 if (funlang == language_cplus) 603 { 604 demangled = cplus_demangle (funname, DMGL_ANSI); 605 if (demangled == NULL) 606 /* If the demangler fails, try the demangled name from 607 the symbol table. This'll have parameters, but 608 that's preferable to diplaying a mangled name. */ 609 funname = SYMBOL_PRINT_NAME (func); 610 } 611 } 612 } 613 else 614 { 615 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi)); 616 if (msymbol != NULL) 617 { 618 funname = DEPRECATED_SYMBOL_NAME (msymbol); 619 funlang = SYMBOL_LANGUAGE (msymbol); 620 } 621 } 622 623 annotate_frame_begin (level == -1 ? 0 : level, get_frame_pc (fi)); 624 625 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame"); 626 627 if (level >= 0) 628 { 629 ui_out_text (uiout, "#"); 630 ui_out_field_fmt_int (uiout, 2, ui_left, "level", level); 631 } 632 if (addressprint) 633 if (get_frame_pc (fi) != sal.pc 634 || !sal.symtab 635 || source == LOC_AND_ADDRESS) 636 { 637 annotate_frame_address (); 638 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi)); 639 annotate_frame_address_end (); 640 ui_out_text (uiout, " in "); 641 } 642 annotate_frame_function_name (); 643 fprintf_symbol_filtered (stb->stream, funname ? funname : "??", funlang, 644 DMGL_ANSI); 645 ui_out_field_stream (uiout, "func", stb); 646 ui_out_wrap_hint (uiout, " "); 647 annotate_frame_args (); 648 649 ui_out_text (uiout, " ("); 650 if (args) 651 { 652 struct print_args_args args; 653 struct cleanup *args_list_chain; 654 args.fi = fi; 655 args.func = func; 656 args.stream = gdb_stdout; 657 args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args"); 658 catch_errors (print_args_stub, &args, "", RETURN_MASK_ALL); 659 /* FIXME: args must be a list. If one argument is a string it will 660 have " that will not be properly escaped. */ 661 /* Invoke ui_out_tuple_end. */ 662 do_cleanups (args_list_chain); 663 QUIT; 664 } 665 ui_out_text (uiout, ")"); 666 if (sal.symtab && sal.symtab->filename) 667 { 668 annotate_frame_source_begin (); 669 ui_out_wrap_hint (uiout, " "); 670 ui_out_text (uiout, " at "); 671 annotate_frame_source_file (); 672 ui_out_field_string (uiout, "file", sal.symtab->filename); 673 annotate_frame_source_file_end (); 674 ui_out_text (uiout, ":"); 675 annotate_frame_source_line (); 676 ui_out_field_int (uiout, "line", sal.line); 677 annotate_frame_source_end (); 678 } 679 680#ifdef PC_SOLIB 681 if (!funname || (!sal.symtab || !sal.symtab->filename)) 682 { 683 char *lib = PC_SOLIB (get_frame_pc (fi)); 684 if (lib) 685 { 686 annotate_frame_where (); 687 ui_out_wrap_hint (uiout, " "); 688 ui_out_text (uiout, " from "); 689 ui_out_field_string (uiout, "from", lib); 690 } 691 } 692#endif /* PC_SOLIB */ 693 694 /* do_cleanups will call ui_out_tuple_end() for us. */ 695 do_cleanups (list_chain); 696 ui_out_text (uiout, "\n"); 697 do_cleanups (old_chain); 698} 699 700/* Show the frame info. If this is the tui, it will be shown in 701 the source display otherwise, nothing is done */ 702void 703show_stack_frame (struct frame_info *fi) 704{ 705} 706 707 708/* Read a frame specification in whatever the appropriate format is. 709 Call error() if the specification is in any way invalid (i.e. 710 this function never returns NULL). */ 711 712struct frame_info * 713parse_frame_specification (char *frame_exp) 714{ 715 int numargs = 0; 716#define MAXARGS 4 717 CORE_ADDR args[MAXARGS]; 718 int level; 719 720 if (frame_exp) 721 { 722 char *addr_string, *p; 723 struct cleanup *tmp_cleanup; 724 725 while (*frame_exp == ' ') 726 frame_exp++; 727 728 while (*frame_exp) 729 { 730 if (numargs > MAXARGS) 731 error ("Too many args in frame specification"); 732 /* Parse an argument. */ 733 for (p = frame_exp; *p && *p != ' '; p++) 734 ; 735 addr_string = savestring (frame_exp, p - frame_exp); 736 737 { 738 struct value *vp; 739 740 tmp_cleanup = make_cleanup (xfree, addr_string); 741 742 /* NOTE: we call parse_and_eval and then both 743 value_as_long and value_as_address rather than calling 744 parse_and_eval_long and parse_and_eval_address because 745 of the issue of potential side effects from evaluating 746 the expression. */ 747 vp = parse_and_eval (addr_string); 748 if (numargs == 0) 749 level = value_as_long (vp); 750 751 args[numargs++] = value_as_address (vp); 752 do_cleanups (tmp_cleanup); 753 } 754 755 /* Skip spaces, move to possible next arg. */ 756 while (*p == ' ') 757 p++; 758 frame_exp = p; 759 } 760 } 761 762 switch (numargs) 763 { 764 case 0: 765 if (deprecated_selected_frame == NULL) 766 error ("No selected frame."); 767 return deprecated_selected_frame; 768 /* NOTREACHED */ 769 case 1: 770 { 771 struct frame_info *fid = 772 find_relative_frame (get_current_frame (), &level); 773 struct frame_info *tfid; 774 775 if (level == 0) 776 /* find_relative_frame was successful */ 777 return fid; 778 779 /* If SETUP_ARBITRARY_FRAME is defined, then frame specifications 780 take at least 2 addresses. It is important to detect this case 781 here so that "frame 100" does not give a confusing error message 782 like "frame specification requires two addresses". This of course 783 does not solve the "frame 100" problem for machines on which 784 a frame specification can be made with one address. To solve 785 that, we need a new syntax for a specifying a frame by address. 786 I think the cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for 787 two args, etc.), but people might think that is too much typing, 788 so I guess *0x23,0x45 would be a possible alternative (commas 789 really should be used instead of spaces to delimit; using spaces 790 normally works in an expression). */ 791#ifdef SETUP_ARBITRARY_FRAME 792 error ("No frame %s", paddr_d (args[0])); 793#endif 794 795 /* If (s)he specifies the frame with an address, he deserves what 796 (s)he gets. Still, give the highest one that matches. */ 797 798 for (fid = get_current_frame (); 799 fid && get_frame_base (fid) != args[0]; 800 fid = get_prev_frame (fid)) 801 ; 802 803 if (fid) 804 while ((tfid = get_prev_frame (fid)) && 805 (get_frame_base (tfid) == args[0])) 806 fid = tfid; 807 808 /* We couldn't identify the frame as an existing frame, but 809 perhaps we can create one with a single argument. */ 810 } 811 812 default: 813#ifdef SETUP_ARBITRARY_FRAME 814 return SETUP_ARBITRARY_FRAME (numargs, args); 815#else 816 /* Usual case. Do it here rather than have everyone supply 817 a SETUP_ARBITRARY_FRAME that does this. */ 818 if (numargs == 1) 819 return create_new_frame (args[0], 0); 820 error ("Too many args in frame specification"); 821#endif 822 /* NOTREACHED */ 823 } 824 /* NOTREACHED */ 825} 826 827/* Print verbosely the selected frame or the frame at address ADDR. 828 This means absolutely all information in the frame is printed. */ 829 830static void 831frame_info (char *addr_exp, int from_tty) 832{ 833 struct frame_info *fi; 834 struct symtab_and_line sal; 835 struct symbol *func; 836 struct symtab *s; 837 struct frame_info *calling_frame_info; 838 int i, count, numregs; 839 char *funname = 0; 840 enum language funlang = language_unknown; 841 const char *pc_regname; 842 843 if (!target_has_stack) 844 error ("No stack."); 845 846 /* Name of the value returned by get_frame_pc(). Per comments, "pc" 847 is not a good name. */ 848 if (PC_REGNUM >= 0) 849 /* OK, this is weird. The PC_REGNUM hardware register's value can 850 easily not match that of the internal value returned by 851 get_frame_pc(). */ 852 pc_regname = REGISTER_NAME (PC_REGNUM); 853 else 854 /* But then, this is weird to. Even without PC_REGNUM, an 855 architectures will often have a hardware register called "pc", 856 and that register's value, again, can easily not match 857 get_frame_pc(). */ 858 pc_regname = "pc"; 859 860 fi = parse_frame_specification (addr_exp); 861 if (fi == NULL) 862 error ("Invalid frame specified."); 863 864 find_frame_sal (fi, &sal); 865 func = get_frame_function (fi); 866 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain 867 the same value. */ 868 s = find_pc_symtab (get_frame_pc (fi)); 869 if (func) 870 { 871 /* I'd like to use SYMBOL_PRINT_NAME() here, to display 872 * the demangled name that we already have stored in 873 * the symbol table, but we stored a version with 874 * DMGL_PARAMS turned on, and here we don't want 875 * to display parameters. So call the demangler again, 876 * with DMGL_ANSI only. RT 877 * (Yes, I know that printf_symbol_filtered() will 878 * again try to demangle the name on the fly, but 879 * the issue is that if cplus_demangle() fails here, 880 * it'll fail there too. So we want to catch the failure 881 * ("demangled==NULL" case below) here, while we still 882 * have our hands on the function symbol.) 883 */ 884 char *demangled; 885 funname = DEPRECATED_SYMBOL_NAME (func); 886 funlang = SYMBOL_LANGUAGE (func); 887 if (funlang == language_cplus) 888 { 889 demangled = cplus_demangle (funname, DMGL_ANSI); 890 /* If the demangler fails, try the demangled name 891 * from the symbol table. This'll have parameters, 892 * but that's preferable to diplaying a mangled name. 893 */ 894 if (demangled == NULL) 895 funname = SYMBOL_PRINT_NAME (func); 896 } 897 } 898 else 899 { 900 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_pc (fi)); 901 if (msymbol != NULL) 902 { 903 funname = DEPRECATED_SYMBOL_NAME (msymbol); 904 funlang = SYMBOL_LANGUAGE (msymbol); 905 } 906 } 907 calling_frame_info = get_prev_frame (fi); 908 909 if (!addr_exp && frame_relative_level (deprecated_selected_frame) >= 0) 910 { 911 printf_filtered ("Stack level %d, frame at ", 912 frame_relative_level (deprecated_selected_frame)); 913 print_address_numeric (get_frame_base (fi), 1, gdb_stdout); 914 printf_filtered (":\n"); 915 } 916 else 917 { 918 printf_filtered ("Stack frame at "); 919 print_address_numeric (get_frame_base (fi), 1, gdb_stdout); 920 printf_filtered (":\n"); 921 } 922 printf_filtered (" %s = ", pc_regname); 923 print_address_numeric (get_frame_pc (fi), 1, gdb_stdout); 924 925 wrap_here (" "); 926 if (funname) 927 { 928 printf_filtered (" in "); 929 fprintf_symbol_filtered (gdb_stdout, funname, funlang, 930 DMGL_ANSI | DMGL_PARAMS); 931 } 932 wrap_here (" "); 933 if (sal.symtab) 934 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line); 935 puts_filtered ("; "); 936 wrap_here (" "); 937 printf_filtered ("saved %s ", pc_regname); 938 print_address_numeric (frame_pc_unwind (fi), 1, gdb_stdout); 939 printf_filtered ("\n"); 940 941 { 942 int frameless; 943 frameless = (DEPRECATED_FRAMELESS_FUNCTION_INVOCATION_P () 944 && DEPRECATED_FRAMELESS_FUNCTION_INVOCATION (fi)); 945 if (frameless) 946 printf_filtered (" (FRAMELESS),"); 947 } 948 949 if (calling_frame_info) 950 { 951 printf_filtered (" called by frame at "); 952 print_address_numeric (get_frame_base (calling_frame_info), 953 1, gdb_stdout); 954 } 955 if (get_next_frame (fi) && calling_frame_info) 956 puts_filtered (","); 957 wrap_here (" "); 958 if (get_next_frame (fi)) 959 { 960 printf_filtered (" caller of frame at "); 961 print_address_numeric (get_frame_base (get_next_frame (fi)), 1, 962 gdb_stdout); 963 } 964 if (get_next_frame (fi) || calling_frame_info) 965 puts_filtered ("\n"); 966 if (s) 967 printf_filtered (" source language %s.\n", 968 language_str (s->language)); 969 970 { 971 /* Address of the argument list for this frame, or 0. */ 972 CORE_ADDR arg_list = get_frame_args_address (fi); 973 /* Number of args for this frame, or -1 if unknown. */ 974 int numargs; 975 976 if (arg_list == 0) 977 printf_filtered (" Arglist at unknown address.\n"); 978 else 979 { 980 printf_filtered (" Arglist at "); 981 print_address_numeric (arg_list, 1, gdb_stdout); 982 printf_filtered (","); 983 984 if (!FRAME_NUM_ARGS_P ()) 985 { 986 numargs = -1; 987 puts_filtered (" args: "); 988 } 989 else 990 { 991 numargs = FRAME_NUM_ARGS (fi); 992 gdb_assert (numargs >= 0); 993 if (numargs == 0) 994 puts_filtered (" no args."); 995 else if (numargs == 1) 996 puts_filtered (" 1 arg: "); 997 else 998 printf_filtered (" %d args: ", numargs); 999 } 1000 print_frame_args (func, fi, numargs, gdb_stdout); 1001 puts_filtered ("\n"); 1002 } 1003 } 1004 { 1005 /* Address of the local variables for this frame, or 0. */ 1006 CORE_ADDR arg_list = get_frame_locals_address (fi); 1007 1008 if (arg_list == 0) 1009 printf_filtered (" Locals at unknown address,"); 1010 else 1011 { 1012 printf_filtered (" Locals at "); 1013 print_address_numeric (arg_list, 1, gdb_stdout); 1014 printf_filtered (","); 1015 } 1016 } 1017 1018 if (DEPRECATED_FRAME_INIT_SAVED_REGS_P () 1019 && deprecated_get_frame_saved_regs (fi) == NULL) 1020 DEPRECATED_FRAME_INIT_SAVED_REGS (fi); 1021 /* Print as much information as possible on the location of all the 1022 registers. */ 1023 { 1024 enum lval_type lval; 1025 int optimized; 1026 CORE_ADDR addr; 1027 int realnum; 1028 int count; 1029 int i; 1030 int need_nl = 1; 1031 1032 /* The sp is special; what's displayed isn't the save address, but 1033 the value of the previous frame's sp. This is a legacy thing, 1034 at one stage the frame cached the previous frame's SP instead 1035 of its address, hence it was easiest to just display the cached 1036 value. */ 1037 if (SP_REGNUM >= 0) 1038 { 1039 /* Find out the location of the saved stack pointer with out 1040 actually evaluating it. */ 1041 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr, 1042 &realnum, NULL); 1043 if (!optimized && lval == not_lval) 1044 { 1045 char value[MAX_REGISTER_SIZE]; 1046 CORE_ADDR sp; 1047 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr, 1048 &realnum, value); 1049 /* NOTE: cagney/2003-05-22: This is assuming that the 1050 stack pointer was packed as an unsigned integer. That 1051 may or may not be valid. */ 1052 sp = extract_unsigned_integer (value, DEPRECATED_REGISTER_RAW_SIZE (SP_REGNUM)); 1053 printf_filtered (" Previous frame's sp is "); 1054 print_address_numeric (sp, 1, gdb_stdout); 1055 printf_filtered ("\n"); 1056 need_nl = 0; 1057 } 1058 else if (!optimized && lval == lval_memory) 1059 { 1060 printf_filtered (" Previous frame's sp at "); 1061 print_address_numeric (addr, 1, gdb_stdout); 1062 printf_filtered ("\n"); 1063 need_nl = 0; 1064 } 1065 else if (!optimized && lval == lval_register) 1066 { 1067 printf_filtered (" Previous frame's sp in %s\n", 1068 REGISTER_NAME (realnum)); 1069 need_nl = 0; 1070 } 1071 /* else keep quiet. */ 1072 } 1073 1074 count = 0; 1075 numregs = NUM_REGS + NUM_PSEUDO_REGS; 1076 for (i = 0; i < numregs; i++) 1077 if (i != SP_REGNUM 1078 && gdbarch_register_reggroup_p (current_gdbarch, i, all_reggroup)) 1079 { 1080 /* Find out the location of the saved register without 1081 fetching the corresponding value. */ 1082 frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum, 1083 NULL); 1084 /* For moment, only display registers that were saved on the 1085 stack. */ 1086 if (!optimized && lval == lval_memory) 1087 { 1088 if (count == 0) 1089 puts_filtered (" Saved registers:\n "); 1090 else 1091 puts_filtered (","); 1092 wrap_here (" "); 1093 printf_filtered (" %s at ", REGISTER_NAME (i)); 1094 print_address_numeric (addr, 1, gdb_stdout); 1095 count++; 1096 } 1097 } 1098 if (count || need_nl) 1099 puts_filtered ("\n"); 1100 } 1101} 1102 1103#if 0 1104/* Set a limit on the number of frames printed by default in a 1105 backtrace. */ 1106 1107static int backtrace_limit; 1108 1109static void 1110set_backtrace_limit_command (char *count_exp, int from_tty) 1111{ 1112 int count = parse_and_eval_long (count_exp); 1113 1114 if (count < 0) 1115 error ("Negative argument not meaningful as backtrace limit."); 1116 1117 backtrace_limit = count; 1118} 1119 1120static void 1121backtrace_limit_info (char *arg, int from_tty) 1122{ 1123 if (arg) 1124 error ("\"Info backtrace-limit\" takes no arguments."); 1125 1126 printf_unfiltered ("Backtrace limit: %d.\n", backtrace_limit); 1127} 1128#endif 1129 1130/* Print briefly all stack frames or just the innermost COUNT frames. */ 1131 1132static void backtrace_command_1 (char *count_exp, int show_locals, 1133 int from_tty); 1134static void 1135backtrace_command_1 (char *count_exp, int show_locals, int from_tty) 1136{ 1137 struct frame_info *fi; 1138 int count; 1139 int i; 1140 struct frame_info *trailing; 1141 int trailing_level; 1142 1143 if (!target_has_stack) 1144 error ("No stack."); 1145 1146 /* The following code must do two things. First, it must 1147 set the variable TRAILING to the frame from which we should start 1148 printing. Second, it must set the variable count to the number 1149 of frames which we should print, or -1 if all of them. */ 1150 trailing = get_current_frame (); 1151 1152 /* The target can be in a state where there is no valid frames 1153 (e.g., just connected). */ 1154 if (trailing == NULL) 1155 error ("No stack."); 1156 1157 trailing_level = 0; 1158 if (count_exp) 1159 { 1160 count = parse_and_eval_long (count_exp); 1161 if (count < 0) 1162 { 1163 struct frame_info *current; 1164 1165 count = -count; 1166 1167 current = trailing; 1168 while (current && count--) 1169 { 1170 QUIT; 1171 current = get_prev_frame (current); 1172 } 1173 1174 /* Will stop when CURRENT reaches the top of the stack. TRAILING 1175 will be COUNT below it. */ 1176 while (current) 1177 { 1178 QUIT; 1179 trailing = get_prev_frame (trailing); 1180 current = get_prev_frame (current); 1181 trailing_level++; 1182 } 1183 1184 count = -1; 1185 } 1186 } 1187 else 1188 count = -1; 1189 1190 if (info_verbose) 1191 { 1192 struct partial_symtab *ps; 1193 1194 /* Read in symbols for all of the frames. Need to do this in 1195 a separate pass so that "Reading in symbols for xxx" messages 1196 don't screw up the appearance of the backtrace. Also 1197 if people have strong opinions against reading symbols for 1198 backtrace this may have to be an option. */ 1199 i = count; 1200 for (fi = trailing; 1201 fi != NULL && i--; 1202 fi = get_prev_frame (fi)) 1203 { 1204 QUIT; 1205 ps = find_pc_psymtab (get_frame_address_in_block (fi)); 1206 if (ps) 1207 PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in */ 1208 } 1209 } 1210 1211 for (i = 0, fi = trailing; 1212 fi && count--; 1213 i++, fi = get_prev_frame (fi)) 1214 { 1215 QUIT; 1216 1217 /* Don't use print_stack_frame; if an error() occurs it probably 1218 means further attempts to backtrace would fail (on the other 1219 hand, perhaps the code does or could be fixed to make sure 1220 the frame->prev field gets set to NULL in that case). */ 1221 print_frame_info (fi, trailing_level + i, 0, 1); 1222 if (show_locals) 1223 print_frame_local_vars (fi, 1, gdb_stdout); 1224 } 1225 1226 /* If we've stopped before the end, mention that. */ 1227 if (fi && from_tty) 1228 printf_filtered ("(More stack frames follow...)\n"); 1229} 1230 1231struct backtrace_command_args 1232 { 1233 char *count_exp; 1234 int show_locals; 1235 int from_tty; 1236 }; 1237 1238/* Stub to call backtrace_command_1 by way of an error catcher. */ 1239static int 1240backtrace_command_stub (void *data) 1241{ 1242 struct backtrace_command_args *args = (struct backtrace_command_args *)data; 1243 backtrace_command_1 (args->count_exp, args->show_locals, args->from_tty); 1244 return 0; 1245} 1246 1247static void 1248backtrace_command (char *arg, int from_tty) 1249{ 1250 struct cleanup *old_chain = (struct cleanup *) NULL; 1251 char **argv = (char **) NULL; 1252 int argIndicatingFullTrace = (-1), totArgLen = 0, argc = 0; 1253 char *argPtr = arg; 1254 struct backtrace_command_args btargs; 1255 1256 if (arg != (char *) NULL) 1257 { 1258 int i; 1259 1260 argv = buildargv (arg); 1261 old_chain = make_cleanup_freeargv (argv); 1262 argc = 0; 1263 for (i = 0; (argv[i] != (char *) NULL); i++) 1264 { 1265 unsigned int j; 1266 1267 for (j = 0; (j < strlen (argv[i])); j++) 1268 argv[i][j] = tolower (argv[i][j]); 1269 1270 if (argIndicatingFullTrace < 0 && subset_compare (argv[i], "full")) 1271 argIndicatingFullTrace = argc; 1272 else 1273 { 1274 argc++; 1275 totArgLen += strlen (argv[i]); 1276 } 1277 } 1278 totArgLen += argc; 1279 if (argIndicatingFullTrace >= 0) 1280 { 1281 if (totArgLen > 0) 1282 { 1283 argPtr = (char *) xmalloc (totArgLen + 1); 1284 if (!argPtr) 1285 nomem (0); 1286 else 1287 { 1288 memset (argPtr, 0, totArgLen + 1); 1289 for (i = 0; (i < (argc + 1)); i++) 1290 { 1291 if (i != argIndicatingFullTrace) 1292 { 1293 strcat (argPtr, argv[i]); 1294 strcat (argPtr, " "); 1295 } 1296 } 1297 } 1298 } 1299 else 1300 argPtr = (char *) NULL; 1301 } 1302 } 1303 1304 btargs.count_exp = argPtr; 1305 btargs.show_locals = (argIndicatingFullTrace >= 0); 1306 btargs.from_tty = from_tty; 1307 catch_errors (backtrace_command_stub, (char *)&btargs, "", RETURN_MASK_ERROR); 1308 1309 if (argIndicatingFullTrace >= 0 && totArgLen > 0) 1310 xfree (argPtr); 1311 1312 if (old_chain) 1313 do_cleanups (old_chain); 1314} 1315 1316static void backtrace_full_command (char *arg, int from_tty); 1317static void 1318backtrace_full_command (char *arg, int from_tty) 1319{ 1320 struct backtrace_command_args btargs; 1321 btargs.count_exp = arg; 1322 btargs.show_locals = 1; 1323 btargs.from_tty = from_tty; 1324 catch_errors (backtrace_command_stub, (char *)&btargs, "", RETURN_MASK_ERROR); 1325} 1326 1327 1328/* Print the local variables of a block B active in FRAME. 1329 Return 1 if any variables were printed; 0 otherwise. */ 1330 1331static int 1332print_block_frame_locals (struct block *b, struct frame_info *fi, 1333 int num_tabs, struct ui_file *stream) 1334{ 1335 struct dict_iterator iter; 1336 int j; 1337 struct symbol *sym; 1338 int values_printed = 0; 1339 1340 ALL_BLOCK_SYMBOLS (b, iter, sym) 1341 { 1342 switch (SYMBOL_CLASS (sym)) 1343 { 1344 case LOC_LOCAL: 1345 case LOC_REGISTER: 1346 case LOC_STATIC: 1347 case LOC_BASEREG: 1348 case LOC_COMPUTED: 1349 values_printed = 1; 1350 for (j = 0; j < num_tabs; j++) 1351 fputs_filtered ("\t", stream); 1352 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream); 1353 fputs_filtered (" = ", stream); 1354 print_variable_value (sym, fi, stream); 1355 fprintf_filtered (stream, "\n"); 1356 break; 1357 1358 default: 1359 /* Ignore symbols which are not locals. */ 1360 break; 1361 } 1362 } 1363 return values_printed; 1364} 1365 1366/* Same, but print labels. */ 1367 1368static int 1369print_block_frame_labels (struct block *b, int *have_default, 1370 struct ui_file *stream) 1371{ 1372 struct dict_iterator iter; 1373 struct symbol *sym; 1374 int values_printed = 0; 1375 1376 ALL_BLOCK_SYMBOLS (b, iter, sym) 1377 { 1378 if (DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (sym), "default")) 1379 { 1380 if (*have_default) 1381 continue; 1382 *have_default = 1; 1383 } 1384 if (SYMBOL_CLASS (sym) == LOC_LABEL) 1385 { 1386 struct symtab_and_line sal; 1387 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0); 1388 values_printed = 1; 1389 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream); 1390 if (addressprint) 1391 { 1392 fprintf_filtered (stream, " "); 1393 print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream); 1394 } 1395 fprintf_filtered (stream, " in file %s, line %d\n", 1396 sal.symtab->filename, sal.line); 1397 } 1398 } 1399 return values_printed; 1400} 1401 1402/* Print on STREAM all the local variables in frame FRAME, 1403 including all the blocks active in that frame 1404 at its current pc. 1405 1406 Returns 1 if the job was done, 1407 or 0 if nothing was printed because we have no info 1408 on the function running in FRAME. */ 1409 1410static void 1411print_frame_local_vars (struct frame_info *fi, int num_tabs, 1412 struct ui_file *stream) 1413{ 1414 struct block *block = get_frame_block (fi, 0); 1415 int values_printed = 0; 1416 1417 if (block == 0) 1418 { 1419 fprintf_filtered (stream, "No symbol table info available.\n"); 1420 return; 1421 } 1422 1423 while (block != 0) 1424 { 1425 if (print_block_frame_locals (block, fi, num_tabs, stream)) 1426 values_printed = 1; 1427 /* After handling the function's top-level block, stop. 1428 Don't continue to its superblock, the block of 1429 per-file symbols. */ 1430 if (BLOCK_FUNCTION (block)) 1431 break; 1432 block = BLOCK_SUPERBLOCK (block); 1433 } 1434 1435 if (!values_printed) 1436 { 1437 fprintf_filtered (stream, "No locals.\n"); 1438 } 1439} 1440 1441/* Same, but print labels. */ 1442 1443static void 1444print_frame_label_vars (struct frame_info *fi, int this_level_only, 1445 struct ui_file *stream) 1446{ 1447 struct blockvector *bl; 1448 struct block *block = get_frame_block (fi, 0); 1449 int values_printed = 0; 1450 int index, have_default = 0; 1451 char *blocks_printed; 1452 CORE_ADDR pc = get_frame_pc (fi); 1453 1454 if (block == 0) 1455 { 1456 fprintf_filtered (stream, "No symbol table info available.\n"); 1457 return; 1458 } 1459 1460 bl = blockvector_for_pc (BLOCK_END (block) - 4, &index); 1461 blocks_printed = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char)); 1462 memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char)); 1463 1464 while (block != 0) 1465 { 1466 CORE_ADDR end = BLOCK_END (block) - 4; 1467 int last_index; 1468 1469 if (bl != blockvector_for_pc (end, &index)) 1470 error ("blockvector blotch"); 1471 if (BLOCKVECTOR_BLOCK (bl, index) != block) 1472 error ("blockvector botch"); 1473 last_index = BLOCKVECTOR_NBLOCKS (bl); 1474 index += 1; 1475 1476 /* Don't print out blocks that have gone by. */ 1477 while (index < last_index 1478 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc) 1479 index++; 1480 1481 while (index < last_index 1482 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end) 1483 { 1484 if (blocks_printed[index] == 0) 1485 { 1486 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), &have_default, stream)) 1487 values_printed = 1; 1488 blocks_printed[index] = 1; 1489 } 1490 index++; 1491 } 1492 if (have_default) 1493 return; 1494 if (values_printed && this_level_only) 1495 return; 1496 1497 /* After handling the function's top-level block, stop. 1498 Don't continue to its superblock, the block of 1499 per-file symbols. */ 1500 if (BLOCK_FUNCTION (block)) 1501 break; 1502 block = BLOCK_SUPERBLOCK (block); 1503 } 1504 1505 if (!values_printed && !this_level_only) 1506 { 1507 fprintf_filtered (stream, "No catches.\n"); 1508 } 1509} 1510 1511void 1512locals_info (char *args, int from_tty) 1513{ 1514 if (!deprecated_selected_frame) 1515 error ("No frame selected."); 1516 print_frame_local_vars (deprecated_selected_frame, 0, gdb_stdout); 1517} 1518 1519static void 1520catch_info (char *ignore, int from_tty) 1521{ 1522 struct symtab_and_line *sal; 1523 1524 /* Check for target support for exception handling */ 1525 sal = target_enable_exception_callback (EX_EVENT_CATCH, 1); 1526 if (sal) 1527 { 1528 /* Currently not handling this */ 1529 /* Ideally, here we should interact with the C++ runtime 1530 system to find the list of active handlers, etc. */ 1531 fprintf_filtered (gdb_stdout, "Info catch not supported with this target/compiler combination.\n"); 1532#if 0 1533 if (!deprecated_selected_frame) 1534 error ("No frame selected."); 1535#endif 1536 } 1537 else 1538 { 1539 /* Assume g++ compiled code -- old v 4.16 behaviour */ 1540 if (!deprecated_selected_frame) 1541 error ("No frame selected."); 1542 1543 print_frame_label_vars (deprecated_selected_frame, 0, gdb_stdout); 1544 } 1545} 1546 1547static void 1548print_frame_arg_vars (struct frame_info *fi, 1549 struct ui_file *stream) 1550{ 1551 struct symbol *func = get_frame_function (fi); 1552 struct block *b; 1553 struct dict_iterator iter; 1554 struct symbol *sym, *sym2; 1555 int values_printed = 0; 1556 1557 if (func == 0) 1558 { 1559 fprintf_filtered (stream, "No symbol table info available.\n"); 1560 return; 1561 } 1562 1563 b = SYMBOL_BLOCK_VALUE (func); 1564 ALL_BLOCK_SYMBOLS (b, iter, sym) 1565 { 1566 switch (SYMBOL_CLASS (sym)) 1567 { 1568 case LOC_ARG: 1569 case LOC_LOCAL_ARG: 1570 case LOC_REF_ARG: 1571 case LOC_REGPARM: 1572 case LOC_REGPARM_ADDR: 1573 case LOC_BASEREG_ARG: 1574 case LOC_COMPUTED_ARG: 1575 values_printed = 1; 1576 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream); 1577 fputs_filtered (" = ", stream); 1578 1579 /* We have to look up the symbol because arguments can have 1580 two entries (one a parameter, one a local) and the one we 1581 want is the local, which lookup_symbol will find for us. 1582 This includes gcc1 (not gcc2) on the sparc when passing a 1583 small structure and gcc2 when the argument type is float 1584 and it is passed as a double and converted to float by 1585 the prologue (in the latter case the type of the LOC_ARG 1586 symbol is double and the type of the LOC_LOCAL symbol is 1587 float). There are also LOC_ARG/LOC_REGISTER pairs which 1588 are not combined in symbol-reading. */ 1589 1590 sym2 = lookup_symbol (DEPRECATED_SYMBOL_NAME (sym), 1591 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL); 1592 print_variable_value (sym2, fi, stream); 1593 fprintf_filtered (stream, "\n"); 1594 break; 1595 1596 default: 1597 /* Don't worry about things which aren't arguments. */ 1598 break; 1599 } 1600 } 1601 if (!values_printed) 1602 { 1603 fprintf_filtered (stream, "No arguments.\n"); 1604 } 1605} 1606 1607void 1608args_info (char *ignore, int from_tty) 1609{ 1610 if (!deprecated_selected_frame) 1611 error ("No frame selected."); 1612 print_frame_arg_vars (deprecated_selected_frame, gdb_stdout); 1613} 1614 1615 1616static void 1617args_plus_locals_info (char *ignore, int from_tty) 1618{ 1619 args_info (ignore, from_tty); 1620 locals_info (ignore, from_tty); 1621} 1622 1623 1624/* Select frame FI. Also print the stack frame and show the source if 1625 this is the tui version. */ 1626static void 1627select_and_print_frame (struct frame_info *fi) 1628{ 1629 select_frame (fi); 1630 if (fi) 1631 { 1632 print_stack_frame (fi, frame_relative_level (fi), 1); 1633 } 1634} 1635 1636/* Return the symbol-block in which the selected frame is executing. 1637 Can return zero under various legitimate circumstances. 1638 1639 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant 1640 code address within the block returned. We use this to decide 1641 which macros are in scope. */ 1642 1643struct block * 1644get_selected_block (CORE_ADDR *addr_in_block) 1645{ 1646 if (!target_has_stack) 1647 return 0; 1648 1649 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create 1650 a selected/current frame? Perhaphs this function is called, 1651 indirectly, by WFI in "infrun.c" where avoiding the creation of 1652 an inner most frame is very important (it slows down single 1653 step). I suspect, though that this was true in the deep dark 1654 past but is no longer the case. A mindless look at all the 1655 callers tends to support this theory. I think we should be able 1656 to assume that there is always a selcted frame. */ 1657 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel 1658 lucky? */ 1659 if (!deprecated_selected_frame) 1660 { 1661 CORE_ADDR pc = read_pc (); 1662 if (addr_in_block != NULL) 1663 *addr_in_block = pc; 1664 return block_for_pc (pc); 1665 } 1666 return get_frame_block (deprecated_selected_frame, addr_in_block); 1667} 1668 1669/* Find a frame a certain number of levels away from FRAME. 1670 LEVEL_OFFSET_PTR points to an int containing the number of levels. 1671 Positive means go to earlier frames (up); negative, the reverse. 1672 The int that contains the number of levels is counted toward 1673 zero as the frames for those levels are found. 1674 If the top or bottom frame is reached, that frame is returned, 1675 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates 1676 how much farther the original request asked to go. */ 1677 1678struct frame_info * 1679find_relative_frame (struct frame_info *frame, 1680 int *level_offset_ptr) 1681{ 1682 struct frame_info *prev; 1683 struct frame_info *frame1; 1684 1685 /* Going up is simple: just do get_prev_frame enough times 1686 or until initial frame is reached. */ 1687 while (*level_offset_ptr > 0) 1688 { 1689 prev = get_prev_frame (frame); 1690 if (prev == 0) 1691 break; 1692 (*level_offset_ptr)--; 1693 frame = prev; 1694 } 1695 /* Going down is just as simple. */ 1696 if (*level_offset_ptr < 0) 1697 { 1698 while (*level_offset_ptr < 0) 1699 { 1700 frame1 = get_next_frame (frame); 1701 if (!frame1) 1702 break; 1703 frame = frame1; 1704 (*level_offset_ptr)++; 1705 } 1706 } 1707 return frame; 1708} 1709 1710/* The "select_frame" command. With no arg, NOP. 1711 With arg LEVEL_EXP, select the frame at level LEVEL if it is a 1712 valid level. Otherwise, treat level_exp as an address expression 1713 and select it. See parse_frame_specification for more info on proper 1714 frame expressions. */ 1715 1716void 1717select_frame_command (char *level_exp, int from_tty) 1718{ 1719 struct frame_info *frame; 1720 int level = frame_relative_level (deprecated_selected_frame); 1721 1722 if (!target_has_stack) 1723 error ("No stack."); 1724 1725 frame = parse_frame_specification (level_exp); 1726 1727 select_frame (frame); 1728 if (level != frame_relative_level (deprecated_selected_frame)) 1729 selected_frame_level_changed_event (frame_relative_level (deprecated_selected_frame)); 1730} 1731 1732/* The "frame" command. With no arg, print selected frame briefly. 1733 With arg, behaves like select_frame and then prints the selected 1734 frame. */ 1735 1736void 1737frame_command (char *level_exp, int from_tty) 1738{ 1739 select_frame_command (level_exp, from_tty); 1740 print_stack_frame (deprecated_selected_frame, 1741 frame_relative_level (deprecated_selected_frame), 1); 1742} 1743 1744/* The XDB Compatibility command to print the current frame. */ 1745 1746static void 1747current_frame_command (char *level_exp, int from_tty) 1748{ 1749 if (target_has_stack == 0 || deprecated_selected_frame == 0) 1750 error ("No stack."); 1751 print_stack_frame (deprecated_selected_frame, 1752 frame_relative_level (deprecated_selected_frame), 1); 1753} 1754 1755/* Select the frame up one or COUNT stack levels 1756 from the previously selected frame, and print it briefly. */ 1757 1758static void 1759up_silently_base (char *count_exp) 1760{ 1761 struct frame_info *fi; 1762 int count = 1, count1; 1763 if (count_exp) 1764 count = parse_and_eval_long (count_exp); 1765 count1 = count; 1766 1767 if (target_has_stack == 0 || deprecated_selected_frame == 0) 1768 error ("No stack."); 1769 1770 fi = find_relative_frame (deprecated_selected_frame, &count1); 1771 if (count1 != 0 && count_exp == 0) 1772 error ("Initial frame selected; you cannot go up."); 1773 select_frame (fi); 1774 selected_frame_level_changed_event (frame_relative_level (deprecated_selected_frame)); 1775} 1776 1777static void 1778up_silently_command (char *count_exp, int from_tty) 1779{ 1780 up_silently_base (count_exp); 1781} 1782 1783static void 1784up_command (char *count_exp, int from_tty) 1785{ 1786 up_silently_base (count_exp); 1787 print_stack_frame (deprecated_selected_frame, 1788 frame_relative_level (deprecated_selected_frame), 1); 1789} 1790 1791/* Select the frame down one or COUNT stack levels 1792 from the previously selected frame, and print it briefly. */ 1793 1794static void 1795down_silently_base (char *count_exp) 1796{ 1797 struct frame_info *frame; 1798 int count = -1, count1; 1799 if (count_exp) 1800 count = -parse_and_eval_long (count_exp); 1801 count1 = count; 1802 1803 if (target_has_stack == 0 || deprecated_selected_frame == 0) 1804 error ("No stack."); 1805 1806 frame = find_relative_frame (deprecated_selected_frame, &count1); 1807 if (count1 != 0 && count_exp == 0) 1808 { 1809 1810 /* We only do this if count_exp is not specified. That way "down" 1811 means to really go down (and let me know if that is 1812 impossible), but "down 9999" can be used to mean go all the way 1813 down without getting an error. */ 1814 1815 error ("Bottom (i.e., innermost) frame selected; you cannot go down."); 1816 } 1817 1818 select_frame (frame); 1819 selected_frame_level_changed_event (frame_relative_level (deprecated_selected_frame)); 1820} 1821 1822static void 1823down_silently_command (char *count_exp, int from_tty) 1824{ 1825 down_silently_base (count_exp); 1826} 1827 1828static void 1829down_command (char *count_exp, int from_tty) 1830{ 1831 down_silently_base (count_exp); 1832 print_stack_frame (deprecated_selected_frame, 1833 frame_relative_level (deprecated_selected_frame), 1); 1834} 1835 1836void 1837return_command (char *retval_exp, int from_tty) 1838{ 1839 struct symbol *thisfun; 1840 struct value *return_value = NULL; 1841 const char *query_prefix = ""; 1842 1843 /* FIXME: cagney/2003-10-20: Perform a minimal existance test on the 1844 target. If that fails, error out. For the moment don't rely on 1845 get_selected_frame as it's error message is the the singularly 1846 obscure "No registers". */ 1847 if (!target_has_registers) 1848 error ("No selected frame."); 1849 thisfun = get_frame_function (get_selected_frame ()); 1850 1851 /* Compute the return value. If the computation triggers an error, 1852 let it bail. If the return type can't be handled, set 1853 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational 1854 message. */ 1855 if (retval_exp) 1856 { 1857 struct type *return_type = NULL; 1858 1859 /* Compute the return value. Should the computation fail, this 1860 call throws an error. */ 1861 return_value = parse_and_eval (retval_exp); 1862 1863 /* Cast return value to the return type of the function. Should 1864 the cast fail, this call throws an error. */ 1865 if (thisfun != NULL) 1866 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun)); 1867 if (return_type == NULL) 1868 return_type = builtin_type_int; 1869 return_value = value_cast (return_type, return_value); 1870 1871 /* Make sure the value is fully evaluated. It may live in the 1872 stack frame we're about to pop. */ 1873 if (VALUE_LAZY (return_value)) 1874 value_fetch_lazy (return_value); 1875 1876 if (TYPE_CODE (return_type) == TYPE_CODE_VOID) 1877 /* If the return-type is "void", don't try to find the 1878 return-value's location. However, do still evaluate the 1879 return expression so that, even when the expression result 1880 is discarded, side effects such as "return i++" still 1881 occure. */ 1882 return_value = NULL; 1883 /* FIXME: cagney/2004-01-17: If the architecture implements both 1884 return_value and extract_returned_value_address, should allow 1885 "return" to work - don't set return_value to NULL. */ 1886 else if (!gdbarch_return_value_p (current_gdbarch) 1887 && (TYPE_CODE (return_type) == TYPE_CODE_STRUCT 1888 || TYPE_CODE (return_type) == TYPE_CODE_UNION)) 1889 { 1890 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy 1891 code. Old architectures don't expect STORE_RETURN_VALUE 1892 to be called with with a small struct that needs to be 1893 stored in registers. Don't start doing it now. */ 1894 query_prefix = "\ 1895A structure or union return type is not supported by this architecture.\n\ 1896If you continue, the return value that you specified will be ignored.\n"; 1897 return_value = NULL; 1898 } 1899 else if (using_struct_return (return_type, 0)) 1900 { 1901 query_prefix = "\ 1902The location at which to store the function's return value is unknown.\n\ 1903If you continue, the return value that you specified will be ignored.\n"; 1904 return_value = NULL; 1905 } 1906 } 1907 1908 /* Does an interactive user really want to do this? Include 1909 information, such as how well GDB can handle the return value, in 1910 the query message. */ 1911 if (from_tty) 1912 { 1913 int confirmed; 1914 if (thisfun == NULL) 1915 confirmed = query ("%sMake selected stack frame return now? ", 1916 query_prefix); 1917 else 1918 confirmed = query ("%sMake %s return now? ", query_prefix, 1919 SYMBOL_PRINT_NAME (thisfun)); 1920 if (!confirmed) 1921 error ("Not confirmed"); 1922 } 1923 1924 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each 1925 frame in turn, should this code just go straight to the relevant 1926 frame and pop that? */ 1927 1928 /* First discard all frames inner-to the selected frame (making the 1929 selected frame current). */ 1930 { 1931 struct frame_id selected_id = get_frame_id (get_selected_frame ()); 1932 while (!frame_id_eq (selected_id, get_frame_id (get_current_frame ()))) 1933 { 1934 if (frame_id_inner (selected_id, get_frame_id (get_current_frame ()))) 1935 /* Caught in the safety net, oops! We've gone way past the 1936 selected frame. */ 1937 error ("Problem while popping stack frames (corrupt stack?)"); 1938 frame_pop (get_current_frame ()); 1939 } 1940 } 1941 1942 /* Second discard the selected frame (which is now also the current 1943 frame). */ 1944 frame_pop (get_current_frame ()); 1945 1946 /* Store RETURN_VAUE in the just-returned register set. */ 1947 if (return_value != NULL) 1948 { 1949 struct type *return_type = VALUE_TYPE (return_value); 1950 if (!gdbarch_return_value_p (current_gdbarch)) 1951 { 1952 STORE_RETURN_VALUE (return_type, current_regcache, 1953 VALUE_CONTENTS (return_value)); 1954 } 1955 /* FIXME: cagney/2004-01-17: If extract_returned_value_address 1956 is available and the function is using 1957 RETURN_VALUE_STRUCT_CONVENTION, should use it to find the 1958 address of the returned value so that it can be assigned. */ 1959 else 1960 { 1961 gdb_assert (gdbarch_return_value (current_gdbarch, return_type, 1962 NULL, NULL, NULL) 1963 == RETURN_VALUE_REGISTER_CONVENTION); 1964 gdbarch_return_value (current_gdbarch, return_type, 1965 current_regcache, NULL /*read*/, 1966 VALUE_CONTENTS (return_value) /*write*/); 1967 } 1968 } 1969 1970 /* If we are at the end of a call dummy now, pop the dummy frame 1971 too. */ 1972 /* NOTE: cagney/2003-01-18: Is this silly? Instead of popping all 1973 the frames in sequence, should this code just pop the dummy frame 1974 directly? */ 1975#ifdef DEPRECATED_CALL_DUMMY_HAS_COMPLETED 1976 /* Since all up-to-date architectures return direct to the dummy 1977 breakpoint address, a dummy frame has, by definition, always 1978 completed. Hence this method is no longer needed. */ 1979 if (DEPRECATED_CALL_DUMMY_HAS_COMPLETED (read_pc(), read_sp (), 1980 get_frame_base (get_current_frame ()))) 1981 frame_pop (get_current_frame ()); 1982#else 1983 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME) 1984 frame_pop (get_current_frame ()); 1985#endif 1986 1987 /* If interactive, print the frame that is now current. */ 1988 if (from_tty) 1989 frame_command ("0", 1); 1990 else 1991 select_frame_command ("0", 0); 1992} 1993 1994/* Sets the scope to input function name, provided that the 1995 function is within the current stack frame */ 1996 1997struct function_bounds 1998{ 1999 CORE_ADDR low, high; 2000}; 2001 2002static void func_command (char *arg, int from_tty); 2003static void 2004func_command (char *arg, int from_tty) 2005{ 2006 struct frame_info *fp; 2007 int found = 0; 2008 struct symtabs_and_lines sals; 2009 int i; 2010 int level = 1; 2011 struct function_bounds *func_bounds = (struct function_bounds *) NULL; 2012 2013 if (arg != (char *) NULL) 2014 return; 2015 2016 fp = parse_frame_specification ("0"); 2017 sals = decode_line_spec (arg, 1); 2018 func_bounds = (struct function_bounds *) xmalloc ( 2019 sizeof (struct function_bounds) * sals.nelts); 2020 for (i = 0; (i < sals.nelts && !found); i++) 2021 { 2022 if (sals.sals[i].pc == (CORE_ADDR) 0 || 2023 find_pc_partial_function (sals.sals[i].pc, 2024 (char **) NULL, 2025 &func_bounds[i].low, 2026 &func_bounds[i].high) == 0) 2027 { 2028 func_bounds[i].low = 2029 func_bounds[i].high = (CORE_ADDR) NULL; 2030 } 2031 } 2032 2033 do 2034 { 2035 for (i = 0; (i < sals.nelts && !found); i++) 2036 found = (get_frame_pc (fp) >= func_bounds[i].low && 2037 get_frame_pc (fp) < func_bounds[i].high); 2038 if (!found) 2039 { 2040 level = 1; 2041 fp = find_relative_frame (fp, &level); 2042 } 2043 } 2044 while (!found && level == 0); 2045 2046 if (func_bounds) 2047 xfree (func_bounds); 2048 2049 if (!found) 2050 printf_filtered ("'%s' not within current stack frame.\n", arg); 2051 else if (fp != deprecated_selected_frame) 2052 select_and_print_frame (fp); 2053} 2054 2055/* Gets the language of the current frame. */ 2056 2057enum language 2058get_frame_language (void) 2059{ 2060 struct symtab *s; 2061 enum language flang; /* The language of the current frame */ 2062 2063 if (deprecated_selected_frame) 2064 { 2065 /* We determine the current frame language by looking up its 2066 associated symtab. To retrieve this symtab, we use the frame PC. 2067 However we cannot use the frame pc as is, because it usually points 2068 to the instruction following the "call", which is sometimes the first 2069 instruction of another function. So we rely on 2070 get_frame_address_in_block(), it provides us with a PC which is 2071 guaranteed to be inside the frame's code block. */ 2072 s = find_pc_symtab (get_frame_address_in_block (deprecated_selected_frame)); 2073 if (s) 2074 flang = s->language; 2075 else 2076 flang = language_unknown; 2077 } 2078 else 2079 flang = language_unknown; 2080 2081 return flang; 2082} 2083 2084void 2085_initialize_stack (void) 2086{ 2087#if 0 2088 backtrace_limit = 30; 2089#endif 2090 2091 add_com ("return", class_stack, return_command, 2092 "Make selected stack frame return to its caller.\n\ 2093Control remains in the debugger, but when you continue\n\ 2094execution will resume in the frame above the one now selected.\n\ 2095If an argument is given, it is an expression for the value to return."); 2096 2097 add_com ("up", class_stack, up_command, 2098 "Select and print stack frame that called this one.\n\ 2099An argument says how many frames up to go."); 2100 add_com ("up-silently", class_support, up_silently_command, 2101 "Same as the `up' command, but does not print anything.\n\ 2102This is useful in command scripts."); 2103 2104 add_com ("down", class_stack, down_command, 2105 "Select and print stack frame called by this one.\n\ 2106An argument says how many frames down to go."); 2107 add_com_alias ("do", "down", class_stack, 1); 2108 add_com_alias ("dow", "down", class_stack, 1); 2109 add_com ("down-silently", class_support, down_silently_command, 2110 "Same as the `down' command, but does not print anything.\n\ 2111This is useful in command scripts."); 2112 2113 add_com ("frame", class_stack, frame_command, 2114 "Select and print a stack frame.\n\ 2115With no argument, print the selected stack frame. (See also \"info frame\").\n\ 2116An argument specifies the frame to select.\n\ 2117It can be a stack frame number or the address of the frame.\n\ 2118With argument, nothing is printed if input is coming from\n\ 2119a command file or a user-defined command."); 2120 2121 add_com_alias ("f", "frame", class_stack, 1); 2122 2123 if (xdb_commands) 2124 { 2125 add_com ("L", class_stack, current_frame_command, 2126 "Print the current stack frame.\n"); 2127 add_com_alias ("V", "frame", class_stack, 1); 2128 } 2129 add_com ("select-frame", class_stack, select_frame_command, 2130 "Select a stack frame without printing anything.\n\ 2131An argument specifies the frame to select.\n\ 2132It can be a stack frame number or the address of the frame.\n"); 2133 2134 add_com ("backtrace", class_stack, backtrace_command, 2135 "Print backtrace of all stack frames, or innermost COUNT frames.\n\ 2136With a negative argument, print outermost -COUNT frames.\n\ 2137Use of the 'full' qualifier also prints the values of the local variables.\n"); 2138 add_com_alias ("bt", "backtrace", class_stack, 0); 2139 if (xdb_commands) 2140 { 2141 add_com_alias ("t", "backtrace", class_stack, 0); 2142 add_com ("T", class_stack, backtrace_full_command, 2143 "Print backtrace of all stack frames, or innermost COUNT frames \n\ 2144and the values of the local variables.\n\ 2145With a negative argument, print outermost -COUNT frames.\n\ 2146Usage: T <count>\n"); 2147 } 2148 2149 add_com_alias ("where", "backtrace", class_alias, 0); 2150 add_info ("stack", backtrace_command, 2151 "Backtrace of the stack, or innermost COUNT frames."); 2152 add_info_alias ("s", "stack", 1); 2153 add_info ("frame", frame_info, 2154 "All about selected stack frame, or frame at ADDR."); 2155 add_info_alias ("f", "frame", 1); 2156 add_info ("locals", locals_info, 2157 "Local variables of current stack frame."); 2158 add_info ("args", args_info, 2159 "Argument variables of current stack frame."); 2160 if (xdb_commands) 2161 add_com ("l", class_info, args_plus_locals_info, 2162 "Argument and local variables of current stack frame."); 2163 2164 if (dbx_commands) 2165 add_com ("func", class_stack, func_command, 2166 "Select the stack frame that contains <func>.\nUsage: func <name>\n"); 2167 2168 add_info ("catch", catch_info, 2169 "Exceptions that can be caught in the current stack frame."); 2170 2171#if 0 2172 add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command, 2173 "Specify maximum number of frames for \"backtrace\" to print by default.", 2174 &setlist); 2175 add_info ("backtrace-limit", backtrace_limit_info, 2176 "The maximum number of frames for \"backtrace\" to print by default."); 2177#endif 2178} 2179