| 1 | /*- |
| 2 | * This code is derived from software copyrighted by the Free Software |
| 3 | * Foundation. |
| 4 | * |
| 5 | * Modified 1991 by Donn Seeley at UUNET Technologies, Inc. |
| 6 | * Modified 1990 by Van Jacobson at Lawrence Berkeley Laboratory. |
| 7 | */ |
| 8 | |
| 9 | #ifndef lint |
| 10 | static char sccsid[] = "@(#)stack.c 6.3 (Berkeley) 5/8/91"; |
| 11 | #endif /* not lint */ |
| 12 | |
| 13 | /* Print and select stack frames for GDB, the GNU debugger. |
| 14 | Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc. |
| 15 | |
| 16 | This file is part of GDB. |
| 17 | |
| 18 | GDB is free software; you can redistribute it and/or modify |
| 19 | it under the terms of the GNU General Public License as published by |
| 20 | the Free Software Foundation; either version 1, or (at your option) |
| 21 | any later version. |
| 22 | |
| 23 | GDB is distributed in the hope that it will be useful, |
| 24 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 25 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 26 | GNU General Public License for more details. |
| 27 | |
| 28 | You should have received a copy of the GNU General Public License |
| 29 | along with GDB; see the file COPYING. If not, write to |
| 30 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 31 | |
| 32 | /* modified by rjc Thu Nov 1 16:46:57 1990, fixed return_command so that |
| 33 | it can return values, it still has problems when running on pmax, |
| 34 | cannot write register 65 */ |
| 35 | |
| 36 | #include <stdio.h> |
| 37 | |
| 38 | #include "defs.h" |
| 39 | #include "param.h" |
| 40 | #include "symtab.h" |
| 41 | #include "frame.h" |
| 42 | #include "value.h" |
| 43 | |
| 44 | |
| 45 | /* Thie "selected" stack frame is used by default for local and arg access. |
| 46 | May be zero, for no selected frame. */ |
| 47 | |
| 48 | FRAME selected_frame; |
| 49 | |
| 50 | /* Level of the selected frame: |
| 51 | 0 for innermost, 1 for its caller, ... |
| 52 | or -1 for frame specified by address with no defined level. */ |
| 53 | |
| 54 | int selected_frame_level; |
| 55 | |
| 56 | /* Nonzero means print the full filename and linenumber |
| 57 | when a frame is printed, and do so in a format programs can parse. */ |
| 58 | |
| 59 | int frame_file_full_name = 0; |
| 60 | |
| 61 | static void select_calling_frame (); |
| 62 | |
| 63 | void print_frame_info (); |
| 64 | \f |
| 65 | /* Print a stack frame briefly. FRAME should be the frame id |
| 66 | and LEVEL should be its level in the stack (or -1 for level not defined). |
| 67 | This prints the level, the function executing, the arguments, |
| 68 | and the file name and line number. |
| 69 | If the pc is not at the beginning of the source line, |
| 70 | the actual pc is printed at the beginning. |
| 71 | |
| 72 | If SOURCE is 1, print the source line as well. |
| 73 | If SOURCE is -1, print ONLY the source line. */ |
| 74 | |
| 75 | static void |
| 76 | print_stack_frame (frame, level, source) |
| 77 | FRAME frame; |
| 78 | int level; |
| 79 | int source; |
| 80 | { |
| 81 | struct frame_info *fi; |
| 82 | |
| 83 | fi = get_frame_info (frame); |
| 84 | |
| 85 | print_frame_info (fi, level, source, 1); |
| 86 | } |
| 87 | |
| 88 | /* Flag which will indicate when the frame has been changed |
| 89 | by and "up" or "down" command. */ |
| 90 | static int frame_changed; |
| 91 | |
| 92 | void |
| 93 | print_frame_info (fi, level, source, args) |
| 94 | struct frame_info *fi; |
| 95 | register int level; |
| 96 | int source; |
| 97 | int args; |
| 98 | { |
| 99 | struct symtab_and_line sal; |
| 100 | struct symbol *func; |
| 101 | register char *funname = 0; |
| 102 | int numargs; |
| 103 | struct partial_symtab *pst; |
| 104 | |
| 105 | /* Don't give very much information if we haven't readin the |
| 106 | symbol table yet. */ |
| 107 | pst = find_pc_psymtab (fi->pc); |
| 108 | if (pst && !pst->readin) |
| 109 | { |
| 110 | /* Abbreviated information. */ |
| 111 | char *fname; |
| 112 | |
| 113 | if (!find_pc_partial_function (fi->pc, &fname, 0)) |
| 114 | fname = "??"; |
| 115 | |
| 116 | printf_filtered ("#%-2d ", level); |
| 117 | printf_filtered ("0x%x in ", fi->pc); |
| 118 | |
| 119 | fputs_demangled(fname, stdout, -1); |
| 120 | fputs_filtered(" (...)\n", stdout); |
| 121 | |
| 122 | return; |
| 123 | } |
| 124 | |
| 125 | sal = find_pc_line (fi->pc, fi->next_frame); |
| 126 | func = find_pc_function (fi->pc); |
| 127 | if (func) |
| 128 | { |
| 129 | /* In certain pathological cases, the symtabs give the wrong |
| 130 | function (when we are in the first function in a file which |
| 131 | is compiled without debugging symbols, the previous function |
| 132 | is compiled with debugging symbols, and the "foo.o" symbol |
| 133 | that is supposed to tell us where the file with debugging symbols |
| 134 | ends has been truncated by ar because it is longer than 15 |
| 135 | characters). |
| 136 | |
| 137 | So look in the misc_function_vector as well, and if it comes |
| 138 | up with a larger address for the function use that instead. |
| 139 | I don't think this can ever cause any problems; |
| 140 | there shouldn't be any |
| 141 | misc_function_vector symbols in the middle of a function. */ |
| 142 | int misc_index = find_pc_misc_function (fi->pc); |
| 143 | if (misc_index >= 0 |
| 144 | && (misc_function_vector[misc_index].address |
| 145 | > BLOCK_START (SYMBOL_BLOCK_VALUE (func)))) |
| 146 | { |
| 147 | /* In this case we have no way of knowing the source file |
| 148 | and line number, so don't print them. */ |
| 149 | sal.symtab = 0; |
| 150 | /* We also don't know anything about the function besides |
| 151 | its address and name. */ |
| 152 | func = 0; |
| 153 | funname = misc_function_vector[misc_index].name; |
| 154 | } |
| 155 | else |
| 156 | funname = SYMBOL_NAME (func); |
| 157 | } |
| 158 | else |
| 159 | { |
| 160 | register int misc_index = find_pc_misc_function (fi->pc); |
| 161 | if (misc_index >= 0) |
| 162 | funname = misc_function_vector[misc_index].name; |
| 163 | } |
| 164 | |
| 165 | if (frame_changed || source >= 0 || !sal.symtab) |
| 166 | { |
| 167 | if (level >= 0) |
| 168 | printf_filtered ("#%-2d ", level); |
| 169 | else if (frame_changed) |
| 170 | printf ("#%-2d ", 0); |
| 171 | if (fi->pc != sal.pc || !sal.symtab) |
| 172 | printf_filtered ("0x%x in ", fi->pc); |
| 173 | fputs_demangled(funname ? funname : "??", stdout, -1); |
| 174 | printf_filtered(" ("); |
| 175 | if (args) |
| 176 | { |
| 177 | if (func) |
| 178 | numargs = -1; |
| 179 | else |
| 180 | FRAME_NUM_ARGS (numargs, fi); |
| 181 | |
| 182 | print_frame_args (func, fi, numargs, stdout); |
| 183 | } |
| 184 | printf_filtered (")"); |
| 185 | if (sal.symtab) |
| 186 | printf_filtered (" (%s line %d)", sal.symtab->filename, sal.line); |
| 187 | printf_filtered ("\n"); |
| 188 | } |
| 189 | |
| 190 | if ((frame_changed || source != 0) && sal.symtab) |
| 191 | { |
| 192 | int done = 0; |
| 193 | int mid_statement = source < 0 && fi->pc != sal.pc; |
| 194 | if (frame_file_full_name) |
| 195 | done = identify_source_line (sal.symtab, sal.line, mid_statement); |
| 196 | if (!done) |
| 197 | { |
| 198 | if (mid_statement) |
| 199 | printf_filtered ("0x%x\t", fi->pc); |
| 200 | print_source_lines (sal.symtab, sal.line, sal.line + 1, 1); |
| 201 | } |
| 202 | current_source_line = max (sal.line - 5, 1); |
| 203 | } |
| 204 | frame_changed = 0; |
| 205 | if (source != 0) |
| 206 | set_default_breakpoint (1, fi->pc, sal.symtab, sal.line); |
| 207 | |
| 208 | fflush (stdout); |
| 209 | } |
| 210 | |
| 211 | /* Call here to print info on selected frame, after a trap. */ |
| 212 | |
| 213 | void |
| 214 | print_sel_frame (just_source) |
| 215 | int just_source; |
| 216 | { |
| 217 | print_stack_frame (selected_frame, -1, just_source ? -1 : 1); |
| 218 | } |
| 219 | |
| 220 | /* Print info on the selected frame, including level number |
| 221 | but not source. */ |
| 222 | |
| 223 | void |
| 224 | print_selected_frame () |
| 225 | { |
| 226 | print_stack_frame (selected_frame, selected_frame_level, 0); |
| 227 | } |
| 228 | |
| 229 | void flush_cached_frames (); |
| 230 | |
| 231 | #ifdef FRAME_SPECIFICATION_DYADIC |
| 232 | extern FRAME setup_arbitrary_frame (); |
| 233 | #endif |
| 234 | |
| 235 | /* |
| 236 | * Read a frame specification in whatever the appropriate format is. |
| 237 | */ |
| 238 | static FRAME |
| 239 | parse_frame_specification (frame_exp) |
| 240 | char *frame_exp; |
| 241 | { |
| 242 | int numargs = 0; |
| 243 | int arg1, arg2; |
| 244 | |
| 245 | if (frame_exp) |
| 246 | { |
| 247 | char *addr_string, *p; |
| 248 | struct cleanup *tmp_cleanup; |
| 249 | struct frame_info *fci; |
| 250 | |
| 251 | while (*frame_exp == ' ') frame_exp++; |
| 252 | for (p = frame_exp; *p && *p != ' '; p++) |
| 253 | ; |
| 254 | |
| 255 | if (*frame_exp) |
| 256 | { |
| 257 | numargs = 1; |
| 258 | addr_string = savestring(frame_exp, p - frame_exp); |
| 259 | |
| 260 | { |
| 261 | tmp_cleanup = make_cleanup (free, addr_string); |
| 262 | arg1 = parse_and_eval_address (addr_string); |
| 263 | do_cleanups (tmp_cleanup); |
| 264 | } |
| 265 | |
| 266 | while (*p == ' ') p++; |
| 267 | |
| 268 | if (*p) |
| 269 | { |
| 270 | numargs = 2; |
| 271 | arg2 = parse_and_eval_address (p); |
| 272 | } |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | switch (numargs) |
| 277 | { |
| 278 | case 0: |
| 279 | return selected_frame; |
| 280 | /* NOTREACHED */ |
| 281 | case 1: |
| 282 | { |
| 283 | int level = arg1; |
| 284 | FRAME fid = find_relative_frame (get_current_frame (), &level); |
| 285 | FRAME tfid; |
| 286 | |
| 287 | if (level == 0) |
| 288 | /* find_relative_frame was successful */ |
| 289 | return fid; |
| 290 | |
| 291 | /* If (s)he specifies the frame with an address, he deserves what |
| 292 | (s)he gets. Still, give the highest one that matches. */ |
| 293 | |
| 294 | for (fid = get_current_frame (); |
| 295 | fid && FRAME_FP (fid) != arg1; |
| 296 | fid = get_prev_frame (fid)) |
| 297 | ; |
| 298 | |
| 299 | if (fid) |
| 300 | while ((tfid = get_prev_frame (fid)) && |
| 301 | (FRAME_FP (tfid) == arg1)) |
| 302 | fid = tfid; |
| 303 | |
| 304 | #ifdef FRAME_SPECIFICATION_DYADIC |
| 305 | if (!fid) |
| 306 | error ("Incorrect number of args in frame specification"); |
| 307 | |
| 308 | return fid; |
| 309 | #else |
| 310 | return create_new_frame (arg1, 0); |
| 311 | #endif |
| 312 | } |
| 313 | /* NOTREACHED */ |
| 314 | case 2: |
| 315 | /* Must be addresses */ |
| 316 | #ifndef FRAME_SPECIFICATION_DYADIC |
| 317 | error ("Incorrect number of args in frame specification"); |
| 318 | #else |
| 319 | return setup_arbitrary_frame (arg1, arg2); |
| 320 | #endif |
| 321 | /* NOTREACHED */ |
| 322 | } |
| 323 | fatal ("Internal: Error in parsing in parse_frame_specification"); |
| 324 | /* NOTREACHED */ |
| 325 | } |
| 326 | |
| 327 | /* FRAME_ARGS_ADDRESS_CORRECT is just like FRAME_ARGS_ADDRESS except |
| 328 | that if it is unsure about the answer, it returns Frame_unknown |
| 329 | instead of guessing (this happens on the VAX, for example). |
| 330 | |
| 331 | On most machines, we never have to guess about the args address, |
| 332 | so FRAME_ARGS_ADDRESS{,_CORRECT} are the same. */ |
| 333 | #if !defined (FRAME_ARGS_ADDRESS_CORRECT) |
| 334 | #define FRAME_ARGS_ADDRESS_CORRECT FRAME_ARGS_ADDRESS |
| 335 | #endif |
| 336 | |
| 337 | /* Print verbosely the selected frame or the frame at address ADDR. |
| 338 | This means absolutely all information in the frame is printed. */ |
| 339 | |
| 340 | static void |
| 341 | frame_info (addr_exp) |
| 342 | char *addr_exp; |
| 343 | { |
| 344 | FRAME frame; |
| 345 | struct frame_info *fi; |
| 346 | struct frame_saved_regs fsr; |
| 347 | struct symtab_and_line sal; |
| 348 | struct symbol *func; |
| 349 | FRAME calling_frame; |
| 350 | int i, count; |
| 351 | char *funname = 0; |
| 352 | |
| 353 | if (!(have_inferior_p () || have_core_file_p ())) |
| 354 | error ("No inferior or core file."); |
| 355 | |
| 356 | frame = parse_frame_specification (addr_exp); |
| 357 | if (!frame) |
| 358 | error ("Invalid frame specified."); |
| 359 | |
| 360 | fi = get_frame_info (frame); |
| 361 | get_frame_saved_regs (fi, &fsr); |
| 362 | sal = find_pc_line (fi->pc, fi->next_frame); |
| 363 | func = get_frame_function (frame); |
| 364 | if (func) |
| 365 | funname = SYMBOL_NAME (func); |
| 366 | else |
| 367 | { |
| 368 | register int misc_index = find_pc_misc_function (fi->pc); |
| 369 | if (misc_index >= 0) |
| 370 | funname = misc_function_vector[misc_index].name; |
| 371 | } |
| 372 | calling_frame = get_prev_frame (frame); |
| 373 | |
| 374 | if (!addr_exp && selected_frame_level >= 0) |
| 375 | printf ("Stack level %d, frame at 0x%x:\n pc = 0x%x", |
| 376 | selected_frame_level, FRAME_FP(frame), fi->pc); |
| 377 | else |
| 378 | printf ("Stack frame at 0x%x:\n pc = 0x%x", |
| 379 | FRAME_FP(frame), fi->pc); |
| 380 | |
| 381 | if (funname) |
| 382 | printf (" in %s", funname); |
| 383 | if (sal.symtab) |
| 384 | printf (" (%s line %d)", sal.symtab->filename, sal.line); |
| 385 | printf ("; saved pc 0x%x\n", FRAME_SAVED_PC (frame)); |
| 386 | if (calling_frame) |
| 387 | printf (" called by frame at 0x%x", FRAME_FP (calling_frame)); |
| 388 | if (fi->next_frame && calling_frame) |
| 389 | printf (","); |
| 390 | if (fi->next_frame) |
| 391 | printf (" caller of frame at 0x%x", fi->next_frame); |
| 392 | if (fi->next_frame || calling_frame) |
| 393 | printf ("\n"); |
| 394 | |
| 395 | { |
| 396 | /* Address of the argument list for this frame, or Frame_unknown. */ |
| 397 | CORE_ADDR arg_list = FRAME_ARGS_ADDRESS_CORRECT (fi); |
| 398 | /* Number of args for this frame, or -1 if unknown. */ |
| 399 | int numargs; |
| 400 | |
| 401 | if (arg_list != Frame_unknown) |
| 402 | { |
| 403 | printf (" Arglist at 0x%x,", arg_list); |
| 404 | |
| 405 | FRAME_NUM_ARGS (numargs, fi); |
| 406 | if (numargs < 0) |
| 407 | printf (" args: "); |
| 408 | else if (numargs == 0) |
| 409 | printf (" no args."); |
| 410 | else if (numargs == 1) |
| 411 | printf (" 1 arg: "); |
| 412 | else |
| 413 | printf (" %d args: ", numargs); |
| 414 | print_frame_args (func, fi, numargs, stdout); |
| 415 | printf ("\n"); |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | /* The sp is special; what's returned isn't the save address, but |
| 420 | actually the value of the previous frame's sp. */ |
| 421 | printf (" Previous frame's sp is 0x%x\n", fsr.regs[SP_REGNUM]); |
| 422 | count = 0; |
| 423 | for (i = 0; i < NUM_REGS; i++) |
| 424 | if (fsr.regs[i] && i != SP_REGNUM) |
| 425 | { |
| 426 | if (count % 4 != 0) |
| 427 | printf (", "); |
| 428 | else |
| 429 | { |
| 430 | if (count == 0) |
| 431 | printf (" Saved registers:"); |
| 432 | printf ("\n "); |
| 433 | } |
| 434 | printf ("%s at 0x%x", reg_names[i], fsr.regs[i]); |
| 435 | count++; |
| 436 | } |
| 437 | if (count) |
| 438 | printf ("\n"); |
| 439 | } |
| 440 | |
| 441 | #if 0 |
| 442 | /* Set a limit on the number of frames printed by default in a |
| 443 | backtrace. */ |
| 444 | |
| 445 | static int backtrace_limit; |
| 446 | |
| 447 | static void |
| 448 | set_backtrace_limit_command (count_exp, from_tty) |
| 449 | char *count_exp; |
| 450 | int from_tty; |
| 451 | { |
| 452 | int count = parse_and_eval_address (count_exp); |
| 453 | |
| 454 | if (count < 0) |
| 455 | error ("Negative argument not meaningful as backtrace limit."); |
| 456 | |
| 457 | backtrace_limit = count; |
| 458 | } |
| 459 | |
| 460 | static void |
| 461 | backtrace_limit_info (arg, from_tty) |
| 462 | char *arg; |
| 463 | int from_tty; |
| 464 | { |
| 465 | if (arg) |
| 466 | error ("\"Info backtrace-limit\" takes no arguments."); |
| 467 | |
| 468 | printf ("Backtrace limit: %d.\n", backtrace_limit); |
| 469 | } |
| 470 | #endif |
| 471 | |
| 472 | /* Print briefly all stack frames or just the innermost COUNT frames. */ |
| 473 | |
| 474 | static void |
| 475 | backtrace_command (count_exp) |
| 476 | char *count_exp; |
| 477 | { |
| 478 | struct frame_info *fi; |
| 479 | register int count; |
| 480 | register FRAME frame; |
| 481 | register int i; |
| 482 | register FRAME trailing; |
| 483 | register int trailing_level; |
| 484 | |
| 485 | /* The following code must do two things. First, it must |
| 486 | set the variable TRAILING to the frame from which we should start |
| 487 | printing. Second, it must set the variable count to the number |
| 488 | of frames which we should print, or -1 if all of them. */ |
| 489 | trailing = get_current_frame (); |
| 490 | trailing_level = 0; |
| 491 | if (count_exp) |
| 492 | { |
| 493 | count = parse_and_eval_address (count_exp); |
| 494 | if (count < 0) |
| 495 | { |
| 496 | FRAME current; |
| 497 | |
| 498 | count = -count; |
| 499 | |
| 500 | current = trailing; |
| 501 | while (current && count--) |
| 502 | current = get_prev_frame (current); |
| 503 | |
| 504 | /* Will stop when CURRENT reaches the top of the stack. TRAILING |
| 505 | will be COUNT below it. */ |
| 506 | while (current) |
| 507 | { |
| 508 | trailing = get_prev_frame (trailing); |
| 509 | current = get_prev_frame (current); |
| 510 | trailing_level++; |
| 511 | } |
| 512 | |
| 513 | count = -1; |
| 514 | } |
| 515 | } |
| 516 | else |
| 517 | count = -1; |
| 518 | |
| 519 | for (i = 0, frame = trailing; |
| 520 | frame && count--; |
| 521 | i++, frame = get_prev_frame (frame)) |
| 522 | { |
| 523 | QUIT; |
| 524 | fi = get_frame_info (frame); |
| 525 | print_frame_info (fi, trailing_level + i, 0, 1); |
| 526 | } |
| 527 | |
| 528 | /* If we've stopped before the end, mention that. */ |
| 529 | if (frame) |
| 530 | printf_filtered ("(More stack frames follow...)\n"); |
| 531 | } |
| 532 | \f |
| 533 | /* Print the local variables of a block B active in FRAME. |
| 534 | Return 1 if any variables were printed; 0 otherwise. */ |
| 535 | |
| 536 | static int |
| 537 | print_block_frame_locals (b, frame, stream) |
| 538 | struct block *b; |
| 539 | register FRAME frame; |
| 540 | register FILE *stream; |
| 541 | { |
| 542 | int nsyms; |
| 543 | register int i; |
| 544 | register struct symbol *sym; |
| 545 | register int values_printed = 0; |
| 546 | |
| 547 | nsyms = BLOCK_NSYMS (b); |
| 548 | |
| 549 | for (i = 0; i < nsyms; i++) |
| 550 | { |
| 551 | sym = BLOCK_SYM (b, i); |
| 552 | if (SYMBOL_CLASS (sym) == LOC_LOCAL |
| 553 | || SYMBOL_CLASS (sym) == LOC_REGISTER |
| 554 | || SYMBOL_CLASS (sym) == LOC_STATIC) |
| 555 | { |
| 556 | values_printed = 1; |
| 557 | fputs_filtered (SYMBOL_NAME (sym), stream); |
| 558 | fputs_filtered (" = ", stream); |
| 559 | print_variable_value (sym, frame, stream); |
| 560 | fprintf_filtered (stream, "\n"); |
| 561 | fflush (stream); |
| 562 | } |
| 563 | } |
| 564 | return values_printed; |
| 565 | } |
| 566 | |
| 567 | /* Print on STREAM all the local variables in frame FRAME, |
| 568 | including all the blocks active in that frame |
| 569 | at its current pc. |
| 570 | |
| 571 | Returns 1 if the job was done, |
| 572 | or 0 if nothing was printed because we have no info |
| 573 | on the function running in FRAME. */ |
| 574 | |
| 575 | static int |
| 576 | print_frame_local_vars (frame, stream) |
| 577 | register FRAME frame; |
| 578 | register FILE *stream; |
| 579 | { |
| 580 | register struct block *block = get_frame_block (frame); |
| 581 | register int values_printed = 0; |
| 582 | |
| 583 | if (block == 0) |
| 584 | { |
| 585 | fprintf_filtered (stream, "No symbol table info available.\n"); |
| 586 | fflush (stream); |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | while (block != 0) |
| 591 | { |
| 592 | if (print_block_frame_locals (block, frame, stream)) |
| 593 | values_printed = 1; |
| 594 | /* After handling the function's top-level block, stop. |
| 595 | Don't continue to its superblock, the block of |
| 596 | per-file symbols. */ |
| 597 | if (BLOCK_FUNCTION (block)) |
| 598 | break; |
| 599 | block = BLOCK_SUPERBLOCK (block); |
| 600 | } |
| 601 | |
| 602 | if (!values_printed) |
| 603 | { |
| 604 | fprintf_filtered (stream, "No locals.\n"); |
| 605 | fflush (stream); |
| 606 | } |
| 607 | |
| 608 | return 1; |
| 609 | } |
| 610 | |
| 611 | static void |
| 612 | locals_info () |
| 613 | { |
| 614 | if (!have_inferior_p () && !have_core_file_p ()) |
| 615 | error ("No inferior or core file."); |
| 616 | |
| 617 | print_frame_local_vars (selected_frame, stdout); |
| 618 | } |
| 619 | |
| 620 | static int |
| 621 | print_frame_arg_vars (frame, stream) |
| 622 | register FRAME frame; |
| 623 | register FILE *stream; |
| 624 | { |
| 625 | struct symbol *func = get_frame_function (frame); |
| 626 | register struct block *b; |
| 627 | int nsyms; |
| 628 | register int i; |
| 629 | register struct symbol *sym; |
| 630 | register int values_printed = 0; |
| 631 | |
| 632 | if (func == 0) |
| 633 | { |
| 634 | fprintf_filtered (stream, "No symbol table info available.\n"); |
| 635 | fflush (stream); |
| 636 | return 0; |
| 637 | } |
| 638 | |
| 639 | b = SYMBOL_BLOCK_VALUE (func); |
| 640 | nsyms = BLOCK_NSYMS (b); |
| 641 | |
| 642 | for (i = 0; i < nsyms; i++) |
| 643 | { |
| 644 | sym = BLOCK_SYM (b, i); |
| 645 | if (SYMBOL_CLASS (sym) == LOC_ARG |
| 646 | || SYMBOL_CLASS (sym) == LOC_REF_ARG |
| 647 | || SYMBOL_CLASS (sym) == LOC_REGPARM) |
| 648 | { |
| 649 | values_printed = 1; |
| 650 | fputs_filtered (SYMBOL_NAME (sym), stream); |
| 651 | fputs_filtered (" = ", stream); |
| 652 | print_variable_value (sym, frame, stream); |
| 653 | fprintf_filtered (stream, "\n"); |
| 654 | fflush (stream); |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | if (!values_printed) |
| 659 | { |
| 660 | fprintf_filtered (stream, "No arguments.\n"); |
| 661 | fflush (stream); |
| 662 | } |
| 663 | |
| 664 | return 1; |
| 665 | } |
| 666 | |
| 667 | static void |
| 668 | args_info () |
| 669 | { |
| 670 | if (!have_inferior_p () && !have_core_file_p ()) |
| 671 | error ("No inferior or core file."); |
| 672 | print_frame_arg_vars (selected_frame, stdout); |
| 673 | } |
| 674 | \f |
| 675 | /* Select frame FRAME, and note that its stack level is LEVEL. |
| 676 | LEVEL may be -1 if an actual level number is not known. */ |
| 677 | |
| 678 | void |
| 679 | select_frame (frame, level) |
| 680 | FRAME frame; |
| 681 | int level; |
| 682 | { |
| 683 | selected_frame = frame; |
| 684 | selected_frame_level = level; |
| 685 | /* Ensure that symbols for this frame are readin. */ |
| 686 | if (frame) |
| 687 | find_pc_symtab (get_frame_info (frame)->pc); |
| 688 | } |
| 689 | |
| 690 | /* Store the selected frame and its level into *FRAMEP and *LEVELP. */ |
| 691 | |
| 692 | void |
| 693 | record_selected_frame (frameaddrp, levelp) |
| 694 | FRAME_ADDR *frameaddrp; |
| 695 | int *levelp; |
| 696 | { |
| 697 | *frameaddrp = FRAME_FP (selected_frame); |
| 698 | *levelp = selected_frame_level; |
| 699 | } |
| 700 | |
| 701 | /* Return the symbol-block in which the selected frame is executing. |
| 702 | Can return zero under various legitimate circumstances. */ |
| 703 | |
| 704 | struct block * |
| 705 | get_selected_block () |
| 706 | { |
| 707 | if (!have_inferior_p () && !have_core_file_p ()) |
| 708 | return 0; |
| 709 | |
| 710 | if (!selected_frame) |
| 711 | return get_current_block (); |
| 712 | return get_frame_block (selected_frame); |
| 713 | } |
| 714 | |
| 715 | /* Find a frame a certain number of levels away from FRAME. |
| 716 | LEVEL_OFFSET_PTR points to an int containing the number of levels. |
| 717 | Positive means go to earlier frames (up); negative, the reverse. |
| 718 | The int that contains the number of levels is counted toward |
| 719 | zero as the frames for those levels are found. |
| 720 | If the top or bottom frame is reached, that frame is returned, |
| 721 | but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates |
| 722 | how much farther the original request asked to go. */ |
| 723 | |
| 724 | FRAME |
| 725 | find_relative_frame (frame, level_offset_ptr) |
| 726 | register FRAME frame; |
| 727 | register int* level_offset_ptr; |
| 728 | { |
| 729 | register FRAME prev; |
| 730 | register FRAME frame1, frame2; |
| 731 | |
| 732 | /* Going up is simple: just do get_prev_frame enough times |
| 733 | or until initial frame is reached. */ |
| 734 | while (*level_offset_ptr > 0) |
| 735 | { |
| 736 | prev = get_prev_frame (frame); |
| 737 | if (prev == 0) |
| 738 | break; |
| 739 | (*level_offset_ptr)--; |
| 740 | frame = prev; |
| 741 | } |
| 742 | /* Going down could be done by iterating get_frame_info to |
| 743 | find the next frame, but that would be quadratic |
| 744 | since get_frame_info must scan all the way from the current frame. |
| 745 | The following algorithm is linear. */ |
| 746 | if (*level_offset_ptr < 0) |
| 747 | { |
| 748 | /* First put frame1 at innermost frame |
| 749 | and frame2 N levels up from there. */ |
| 750 | frame1 = get_current_frame (); |
| 751 | frame2 = frame1; |
| 752 | while (*level_offset_ptr < 0 && frame2 != frame) |
| 753 | { |
| 754 | frame2 = get_prev_frame (frame2); |
| 755 | (*level_offset_ptr) ++; |
| 756 | } |
| 757 | /* Then slide frame1 and frame2 up in synchrony |
| 758 | and when frame2 reaches our starting point |
| 759 | frame1 must be N levels down from there. */ |
| 760 | while (frame2 != frame) |
| 761 | { |
| 762 | frame1 = get_prev_frame (frame1); |
| 763 | frame2 = get_prev_frame (frame2); |
| 764 | } |
| 765 | return frame1; |
| 766 | } |
| 767 | return frame; |
| 768 | } |
| 769 | |
| 770 | /* The "frame" command. With no arg, print selected frame briefly. |
| 771 | With arg LEVEL_EXP, select the frame at level LEVEL if it is a |
| 772 | valid level. Otherwise, treat level_exp as an address expression |
| 773 | and print it. See parse_frame_specification for more info on proper |
| 774 | frame expressions. */ |
| 775 | |
| 776 | static void |
| 777 | frame_command (level_exp, from_tty) |
| 778 | char *level_exp; |
| 779 | int from_tty; |
| 780 | { |
| 781 | register FRAME frame, frame1; |
| 782 | unsigned int level = 0; |
| 783 | |
| 784 | if (!have_inferior_p () && ! have_core_file_p ()) |
| 785 | error ("No inferior or core file."); |
| 786 | |
| 787 | frame = parse_frame_specification (level_exp); |
| 788 | |
| 789 | for (frame1 = get_prev_frame (0); |
| 790 | frame1 && frame1 != frame; |
| 791 | frame1 = get_prev_frame (frame1)) |
| 792 | level++; |
| 793 | |
| 794 | if (!frame1) |
| 795 | level = 0; |
| 796 | |
| 797 | frame_changed = level; |
| 798 | select_frame (frame, level); |
| 799 | |
| 800 | if (!from_tty) |
| 801 | return; |
| 802 | |
| 803 | print_stack_frame (selected_frame, selected_frame_level, 1); |
| 804 | } |
| 805 | |
| 806 | /* Select the frame up one or COUNT stack levels |
| 807 | from the previously selected frame, and print it briefly. */ |
| 808 | |
| 809 | static void |
| 810 | up_command (count_exp) |
| 811 | char *count_exp; |
| 812 | { |
| 813 | register FRAME frame; |
| 814 | int count = 1, count1; |
| 815 | if (count_exp) |
| 816 | count = parse_and_eval_address (count_exp); |
| 817 | count1 = count; |
| 818 | |
| 819 | if (!have_inferior_p () && !have_core_file_p ()) |
| 820 | error ("No inferior or core file."); |
| 821 | |
| 822 | frame = find_relative_frame (selected_frame, &count1); |
| 823 | if (count1 != 0 && count_exp == 0) |
| 824 | error ("Initial frame selected; you cannot go up."); |
| 825 | select_frame (frame, selected_frame_level + count - count1); |
| 826 | |
| 827 | print_stack_frame (selected_frame, selected_frame_level, 1); |
| 828 | frame_changed++; |
| 829 | } |
| 830 | |
| 831 | /* Select the frame down one or COUNT stack levels |
| 832 | from the previously selected frame, and print it briefly. */ |
| 833 | |
| 834 | static void |
| 835 | down_command (count_exp) |
| 836 | char *count_exp; |
| 837 | { |
| 838 | register FRAME frame; |
| 839 | int count = -1, count1; |
| 840 | if (count_exp) |
| 841 | count = - parse_and_eval_address (count_exp); |
| 842 | count1 = count; |
| 843 | |
| 844 | frame = find_relative_frame (selected_frame, &count1); |
| 845 | if (count1 != 0 && count_exp == 0) |
| 846 | error ("Bottom (i.e., innermost) frame selected; you cannot go down."); |
| 847 | select_frame (frame, selected_frame_level + count - count1); |
| 848 | |
| 849 | print_stack_frame (selected_frame, selected_frame_level, 1); |
| 850 | frame_changed--; |
| 851 | } |
| 852 | \f |
| 853 | static void |
| 854 | return_command (retval_exp, from_tty) |
| 855 | char *retval_exp; |
| 856 | int from_tty; |
| 857 | { |
| 858 | value return_value; |
| 859 | struct symbol *thisfun = get_frame_function (selected_frame); |
| 860 | FRAME_ADDR selected_frame_addr = FRAME_FP (selected_frame); |
| 861 | |
| 862 | /* If interactive, require confirmation. */ |
| 863 | |
| 864 | if (from_tty) |
| 865 | { |
| 866 | if (thisfun != 0) |
| 867 | { |
| 868 | if (!query ("Make %s return now? ", SYMBOL_NAME (thisfun))) |
| 869 | error ("Not confirmed."); |
| 870 | } |
| 871 | else |
| 872 | if (!query ("Make selected stack frame return now? ")) |
| 873 | error ("Not confirmed."); |
| 874 | } |
| 875 | |
| 876 | /* Do the real work. Pop until the specified frame is current. We |
| 877 | use this method because the selected_frame is not valid after |
| 878 | a POP_FRAME. Note that this will not work if the selected frame |
| 879 | shares it's fp with another frame. */ |
| 880 | |
| 881 | while (selected_frame_addr != FRAME_FP (get_current_frame())) |
| 882 | POP_FRAME; |
| 883 | |
| 884 | /* get the return value while still in this frame */ |
| 885 | if (retval_exp) |
| 886 | return_value = parse_and_eval (retval_exp); |
| 887 | |
| 888 | /* Then pop that frame. */ |
| 889 | POP_FRAME; |
| 890 | |
| 891 | /* Store the return value if there was one */ |
| 892 | |
| 893 | if (retval_exp) |
| 894 | set_return_value (return_value); |
| 895 | |
| 896 | /* If interactive, print the frame that is now current. */ |
| 897 | |
| 898 | if (from_tty) |
| 899 | frame_command ("0", 1); |
| 900 | } |
| 901 | \f |
| 902 | extern struct cmd_list_element *setlist; |
| 903 | |
| 904 | void |
| 905 | _initialize_stack () |
| 906 | { |
| 907 | #if 0 |
| 908 | backtrace_limit = 30; |
| 909 | #endif |
| 910 | |
| 911 | add_com ("return", class_stack, return_command, |
| 912 | "Make selected stack frame return to its caller.\n\ |
| 913 | Control remains in the debugger, but when you continue\n\ |
| 914 | execution will resume in the frame above the one now selected.\n\ |
| 915 | If an argument is given, it is an expression for the value to return."); |
| 916 | |
| 917 | add_com ("up", class_stack, up_command, |
| 918 | "Select and print stack frame that called this one.\n\ |
| 919 | An argument says how many frames up to go."); |
| 920 | |
| 921 | add_com ("down", class_stack, down_command, |
| 922 | "Select and print stack frame called by this one.\n\ |
| 923 | An argument says how many frames down to go."); |
| 924 | add_com_alias ("do", "down", class_stack, 1); |
| 925 | |
| 926 | add_com ("frame", class_stack, frame_command, |
| 927 | "Select and print a stack frame.\n\ |
| 928 | With no argument, print the selected stack frame. (See also \"info frame\").\n\ |
| 929 | An argument specifies the frame to select.\n\ |
| 930 | It can be a stack frame number or the address of the frame.\n\ |
| 931 | With argument, nothing is printed if input is coming from\n\ |
| 932 | a command file or a user-defined command."); |
| 933 | |
| 934 | add_com_alias ("f", "frame", class_stack, 1); |
| 935 | |
| 936 | add_com ("backtrace", class_stack, backtrace_command, |
| 937 | "Print backtrace of all stack frames, or innermost COUNT frames.\n\ |
| 938 | With a negative argument, print outermost -COUNT frames."); |
| 939 | add_com_alias ("bt", "backtrace", class_stack, 0); |
| 940 | add_com_alias ("where", "backtrace", class_alias, 0); |
| 941 | add_info ("stack", backtrace_command, |
| 942 | "Backtrace of the stack, or innermost COUNT frames."); |
| 943 | add_info_alias ("s", "stack", 1); |
| 944 | add_info ("frame", frame_info, |
| 945 | "All about selected stack frame, or frame at ADDR."); |
| 946 | add_info_alias ("f", "frame", 1); |
| 947 | add_info ("locals", locals_info, |
| 948 | "Local variables of current stack frame."); |
| 949 | add_info ("args", args_info, |
| 950 | "Argument variables of current stack frame."); |
| 951 | |
| 952 | #if 0 |
| 953 | add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command, |
| 954 | "Specify maximum number of frames for \"backtrace\" to print by default.", |
| 955 | &setlist); |
| 956 | add_info ("backtrace-limit", backtrace_limit_info, |
| 957 | "The maximum number of frames for \"backtrace\" to print by default."); |
| 958 | #endif |
| 959 | } |
| 960 | |