| 1 | /* Print and select stack frames for GDB, the GNU debugger. |
| 2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "value.h" |
| 22 | #include "symtab.h" |
| 23 | #include "gdbtypes.h" |
| 24 | #include "expression.h" |
| 25 | #include "language.h" |
| 26 | #include "frame.h" |
| 27 | #include "gdbcmd.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "target.h" |
| 30 | #include "breakpoint.h" |
| 31 | #include "demangle.h" |
| 32 | #include "inferior.h" |
| 33 | |
| 34 | static void |
| 35 | return_command PARAMS ((char *, int)); |
| 36 | |
| 37 | static void |
| 38 | down_command PARAMS ((char *, int)); |
| 39 | |
| 40 | static void |
| 41 | down_silently_command PARAMS ((char *, int)); |
| 42 | |
| 43 | static void |
| 44 | up_command PARAMS ((char *, int)); |
| 45 | |
| 46 | static void |
| 47 | up_silently_command PARAMS ((char *, int)); |
| 48 | |
| 49 | static void |
| 50 | frame_command PARAMS ((char *, int)); |
| 51 | |
| 52 | static void |
| 53 | select_frame_command PARAMS ((char *, int)); |
| 54 | |
| 55 | static void |
| 56 | args_info PARAMS ((char *, int)); |
| 57 | |
| 58 | static void |
| 59 | print_frame_arg_vars PARAMS ((FRAME, GDB_FILE *)); |
| 60 | |
| 61 | static void |
| 62 | catch_info PARAMS ((char *, int)); |
| 63 | |
| 64 | static void |
| 65 | locals_info PARAMS ((char *, int)); |
| 66 | |
| 67 | static void |
| 68 | print_frame_label_vars PARAMS ((FRAME, int, GDB_FILE *)); |
| 69 | |
| 70 | static void |
| 71 | print_frame_local_vars PARAMS ((FRAME, GDB_FILE *)); |
| 72 | |
| 73 | static int |
| 74 | print_block_frame_labels PARAMS ((struct block *, int *, GDB_FILE *)); |
| 75 | |
| 76 | static int |
| 77 | print_block_frame_locals PARAMS ((struct block *, FRAME, GDB_FILE *)); |
| 78 | |
| 79 | static void |
| 80 | backtrace_command PARAMS ((char *, int)); |
| 81 | |
| 82 | static FRAME |
| 83 | parse_frame_specification PARAMS ((char *)); |
| 84 | |
| 85 | static void |
| 86 | frame_info PARAMS ((char *, int)); |
| 87 | |
| 88 | |
| 89 | extern int addressprint; /* Print addresses, or stay symbolic only? */ |
| 90 | extern int info_verbose; /* Verbosity of symbol reading msgs */ |
| 91 | extern int lines_to_list; /* # of lines "list" command shows by default */ |
| 92 | |
| 93 | /* The "selected" stack frame is used by default for local and arg access. |
| 94 | May be zero, for no selected frame. */ |
| 95 | |
| 96 | FRAME selected_frame; |
| 97 | |
| 98 | /* Level of the selected frame: |
| 99 | 0 for innermost, 1 for its caller, ... |
| 100 | or -1 for frame specified by address with no defined level. */ |
| 101 | |
| 102 | int selected_frame_level; |
| 103 | |
| 104 | /* Zero means do things normally; we are interacting directly with the |
| 105 | user. One means print the full filename and linenumber when a |
| 106 | frame is printed, and do so in a format emacs18/emacs19.22 can |
| 107 | parse. Two means print similar annotations, but in many more |
| 108 | cases and in a slightly different syntax. */ |
| 109 | |
| 110 | int annotation_level = 0; |
| 111 | |
| 112 | \f |
| 113 | struct print_stack_frame_args { |
| 114 | struct frame_info *fi; |
| 115 | int level; |
| 116 | int source; |
| 117 | int args; |
| 118 | }; |
| 119 | |
| 120 | static int print_stack_frame_stub PARAMS ((char *)); |
| 121 | |
| 122 | /* Pass the args the way catch_errors wants them. */ |
| 123 | static int |
| 124 | print_stack_frame_stub (args) |
| 125 | char *args; |
| 126 | { |
| 127 | struct print_stack_frame_args *p = (struct print_stack_frame_args *)args; |
| 128 | print_frame_info (p->fi, p->level, p->source, p->args); |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | /* Print a stack frame briefly. FRAME should be the frame id |
| 133 | and LEVEL should be its level in the stack (or -1 for level not defined). |
| 134 | This prints the level, the function executing, the arguments, |
| 135 | and the file name and line number. |
| 136 | If the pc is not at the beginning of the source line, |
| 137 | the actual pc is printed at the beginning. |
| 138 | |
| 139 | If SOURCE is 1, print the source line as well. |
| 140 | If SOURCE is -1, print ONLY the source line. */ |
| 141 | |
| 142 | void |
| 143 | print_stack_frame (frame, level, source) |
| 144 | FRAME frame; |
| 145 | int level; |
| 146 | int source; |
| 147 | { |
| 148 | struct print_stack_frame_args args; |
| 149 | |
| 150 | args.fi = get_frame_info (frame); |
| 151 | args.level = level; |
| 152 | args.source = source; |
| 153 | args.args = 1; |
| 154 | |
| 155 | catch_errors (print_stack_frame_stub, (char *)&args, "", RETURN_MASK_ERROR); |
| 156 | } |
| 157 | |
| 158 | struct print_args_args { |
| 159 | struct symbol *func; |
| 160 | struct frame_info *fi; |
| 161 | }; |
| 162 | |
| 163 | static int print_args_stub PARAMS ((char *)); |
| 164 | |
| 165 | /* Pass the args the way catch_errors wants them. */ |
| 166 | static int |
| 167 | print_args_stub (args) |
| 168 | char *args; |
| 169 | { |
| 170 | int numargs; |
| 171 | struct print_args_args *p = (struct print_args_args *)args; |
| 172 | FRAME_NUM_ARGS (numargs, (p->fi)); |
| 173 | print_frame_args (p->func, p->fi, numargs, gdb_stdout); |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | void |
| 178 | print_frame_info (fi, level, source, args) |
| 179 | struct frame_info *fi; |
| 180 | register int level; |
| 181 | int source; |
| 182 | int args; |
| 183 | { |
| 184 | struct symtab_and_line sal; |
| 185 | struct symbol *func; |
| 186 | register char *funname = 0; |
| 187 | enum language funlang = language_unknown; |
| 188 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 189 | CORE_ADDR sp; |
| 190 | |
| 191 | #if 0 |
| 192 | /* On the 68k, this spends too much time in m68k_find_saved_regs. */ |
| 193 | |
| 194 | /* Get the value of SP_REGNUM relative to the frame. */ |
| 195 | get_saved_register (buf, (int *)NULL, (CORE_ADDR *)NULL, |
| 196 | FRAME_INFO_ID (fi), SP_REGNUM, (enum lval_type *)NULL); |
| 197 | sp = extract_address (buf, REGISTER_RAW_SIZE (SP_REGNUM)); |
| 198 | |
| 199 | /* This is not a perfect test, because if a function alloca's some |
| 200 | memory, puts some code there, and then jumps into it, then the test |
| 201 | will succeed even though there is no call dummy. Probably best is |
| 202 | to check for a bp_call_dummy breakpoint. */ |
| 203 | if (PC_IN_CALL_DUMMY (fi->pc, sp, fi->frame)) |
| 204 | #else |
| 205 | if (frame_in_dummy (fi)) |
| 206 | #endif |
| 207 | { |
| 208 | /* Do this regardless of SOURCE because we don't have any source |
| 209 | to list for this frame. */ |
| 210 | if (level >= 0) |
| 211 | printf_filtered ("#%-2d ", level); |
| 212 | printf_filtered ("<function called from gdb>\n"); |
| 213 | return; |
| 214 | } |
| 215 | if (fi->signal_handler_caller) |
| 216 | { |
| 217 | /* Do this regardless of SOURCE because we don't have any source |
| 218 | to list for this frame. */ |
| 219 | if (level >= 0) |
| 220 | printf_filtered ("#%-2d ", level); |
| 221 | printf_filtered ("<signal handler called>\n"); |
| 222 | return; |
| 223 | } |
| 224 | |
| 225 | /* If fi is not the innermost frame, that normally means that fi->pc |
| 226 | points to *after* the call instruction, and we want to get the line |
| 227 | containing the call, never the next line. But if the next frame is |
| 228 | a signal_handler_caller or a dummy frame, then the next frame was |
| 229 | not entered as the result of a call, and we want to get the line |
| 230 | containing fi->pc. */ |
| 231 | sal = |
| 232 | find_pc_line (fi->pc, |
| 233 | fi->next != NULL |
| 234 | && !fi->next->signal_handler_caller |
| 235 | && !frame_in_dummy (fi->next)); |
| 236 | |
| 237 | func = find_pc_function (fi->pc); |
| 238 | if (func) |
| 239 | { |
| 240 | /* In certain pathological cases, the symtabs give the wrong |
| 241 | function (when we are in the first function in a file which |
| 242 | is compiled without debugging symbols, the previous function |
| 243 | is compiled with debugging symbols, and the "foo.o" symbol |
| 244 | that is supposed to tell us where the file with debugging symbols |
| 245 | ends has been truncated by ar because it is longer than 15 |
| 246 | characters). This also occurs if the user uses asm() to create |
| 247 | a function but not stabs for it (in a file compiled -g). |
| 248 | |
| 249 | So look in the minimal symbol tables as well, and if it comes |
| 250 | up with a larger address for the function use that instead. |
| 251 | I don't think this can ever cause any problems; there shouldn't |
| 252 | be any minimal symbols in the middle of a function; if this is |
| 253 | ever changed many parts of GDB will need to be changed (and we'll |
| 254 | create a find_pc_minimal_function or some such). */ |
| 255 | |
| 256 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc); |
| 257 | if (msymbol != NULL |
| 258 | && (SYMBOL_VALUE_ADDRESS (msymbol) |
| 259 | > BLOCK_START (SYMBOL_BLOCK_VALUE (func)))) |
| 260 | { |
| 261 | #if 0 |
| 262 | /* There is no particular reason to think the line number |
| 263 | information is wrong. Someone might have just put in |
| 264 | a label with asm() but left the line numbers alone. */ |
| 265 | /* In this case we have no way of knowing the source file |
| 266 | and line number, so don't print them. */ |
| 267 | sal.symtab = 0; |
| 268 | #endif |
| 269 | /* We also don't know anything about the function besides |
| 270 | its address and name. */ |
| 271 | func = 0; |
| 272 | funname = SYMBOL_NAME (msymbol); |
| 273 | funlang = SYMBOL_LANGUAGE (msymbol); |
| 274 | } |
| 275 | else |
| 276 | { |
| 277 | funname = SYMBOL_NAME (func); |
| 278 | funlang = SYMBOL_LANGUAGE (func); |
| 279 | } |
| 280 | } |
| 281 | else |
| 282 | { |
| 283 | register struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc); |
| 284 | if (msymbol != NULL) |
| 285 | { |
| 286 | funname = SYMBOL_NAME (msymbol); |
| 287 | funlang = SYMBOL_LANGUAGE (msymbol); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | if (source >= 0 || !sal.symtab) |
| 292 | { |
| 293 | if (level >= 0) |
| 294 | printf_filtered ("#%-2d ", level); |
| 295 | if (addressprint) |
| 296 | if (fi->pc != sal.pc || !sal.symtab) |
| 297 | { |
| 298 | print_address_numeric (fi->pc, 1, gdb_stdout); |
| 299 | printf_filtered (" in "); |
| 300 | } |
| 301 | fprintf_symbol_filtered (gdb_stdout, funname ? funname : "??", funlang, |
| 302 | DMGL_ANSI); |
| 303 | wrap_here (" "); |
| 304 | fputs_filtered (" (", gdb_stdout); |
| 305 | if (args) |
| 306 | { |
| 307 | struct print_args_args args; |
| 308 | args.fi = fi; |
| 309 | args.func = func; |
| 310 | catch_errors (print_args_stub, (char *)&args, "", RETURN_MASK_ERROR); |
| 311 | } |
| 312 | printf_filtered (")"); |
| 313 | if (sal.symtab && sal.symtab->filename) |
| 314 | { |
| 315 | wrap_here (" "); |
| 316 | printf_filtered (" at %s:%d", sal.symtab->filename, sal.line); |
| 317 | } |
| 318 | |
| 319 | #ifdef PC_LOAD_SEGMENT |
| 320 | /* If we couldn't print out function name but if can figure out what |
| 321 | load segment this pc value is from, at least print out some info |
| 322 | about its load segment. */ |
| 323 | if (!funname) { |
| 324 | wrap_here (" "); |
| 325 | printf_filtered (" from %s", PC_LOAD_SEGMENT (fi->pc)); |
| 326 | } |
| 327 | #endif |
| 328 | printf_filtered ("\n"); |
| 329 | } |
| 330 | |
| 331 | if ((source != 0) && sal.symtab) |
| 332 | { |
| 333 | int done = 0; |
| 334 | int mid_statement = source < 0 && fi->pc != sal.pc; |
| 335 | if (annotation_level) |
| 336 | done = identify_source_line (sal.symtab, sal.line, mid_statement, |
| 337 | fi->pc); |
| 338 | if (!done) |
| 339 | { |
| 340 | if (addressprint && mid_statement) |
| 341 | { |
| 342 | print_address_numeric (fi->pc, 1, gdb_stdout); |
| 343 | printf_filtered ("\t"); |
| 344 | } |
| 345 | print_source_lines (sal.symtab, sal.line, sal.line + 1, 0); |
| 346 | } |
| 347 | current_source_line = max (sal.line - lines_to_list/2, 1); |
| 348 | } |
| 349 | if (source != 0) |
| 350 | set_default_breakpoint (1, fi->pc, sal.symtab, sal.line); |
| 351 | |
| 352 | gdb_flush (gdb_stdout); |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * Read a frame specification in whatever the appropriate format is. |
| 357 | * Call error() if the specification is in any way invalid (i.e. |
| 358 | * this function never returns NULL). |
| 359 | */ |
| 360 | static FRAME |
| 361 | parse_frame_specification (frame_exp) |
| 362 | char *frame_exp; |
| 363 | { |
| 364 | int numargs = 0; |
| 365 | #define MAXARGS 4 |
| 366 | CORE_ADDR args[MAXARGS]; |
| 367 | |
| 368 | if (frame_exp) |
| 369 | { |
| 370 | char *addr_string, *p; |
| 371 | struct cleanup *tmp_cleanup; |
| 372 | |
| 373 | while (*frame_exp == ' ') frame_exp++; |
| 374 | |
| 375 | while (*frame_exp) |
| 376 | { |
| 377 | if (numargs > MAXARGS) |
| 378 | error ("Too many args in frame specification"); |
| 379 | /* Parse an argument. */ |
| 380 | for (p = frame_exp; *p && *p != ' '; p++) |
| 381 | ; |
| 382 | addr_string = savestring(frame_exp, p - frame_exp); |
| 383 | |
| 384 | { |
| 385 | tmp_cleanup = make_cleanup (free, addr_string); |
| 386 | args[numargs++] = parse_and_eval_address (addr_string); |
| 387 | do_cleanups (tmp_cleanup); |
| 388 | } |
| 389 | |
| 390 | /* Skip spaces, move to possible next arg. */ |
| 391 | while (*p == ' ') p++; |
| 392 | frame_exp = p; |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | switch (numargs) |
| 397 | { |
| 398 | case 0: |
| 399 | if (selected_frame == NULL) |
| 400 | error ("No selected frame."); |
| 401 | return selected_frame; |
| 402 | /* NOTREACHED */ |
| 403 | case 1: |
| 404 | { |
| 405 | int level = args[0]; |
| 406 | FRAME fid = find_relative_frame (get_current_frame (), &level); |
| 407 | FRAME tfid; |
| 408 | |
| 409 | if (level == 0) |
| 410 | /* find_relative_frame was successful */ |
| 411 | return fid; |
| 412 | |
| 413 | /* If SETUP_ARBITRARY_FRAME is defined, then frame specifications |
| 414 | take at least 2 addresses. It is important to detect this case |
| 415 | here so that "frame 100" does not give a confusing error message |
| 416 | like "frame specification requires two addresses". This of course |
| 417 | does not solve the "frame 100" problem for machines on which |
| 418 | a frame specification can be made with one address. To solve |
| 419 | that, we need a new syntax for a specifying a frame by address. |
| 420 | I think the cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for |
| 421 | two args, etc.), but people might think that is too much typing, |
| 422 | so I guess *0x23,0x45 would be a possible alternative (commas |
| 423 | really should be used instead of spaces to delimit; using spaces |
| 424 | normally works in an expression). */ |
| 425 | #ifdef SETUP_ARBITRARY_FRAME |
| 426 | error ("No frame %d", args[0]); |
| 427 | #endif |
| 428 | |
| 429 | /* If (s)he specifies the frame with an address, he deserves what |
| 430 | (s)he gets. Still, give the highest one that matches. */ |
| 431 | |
| 432 | for (fid = get_current_frame (); |
| 433 | fid && FRAME_FP (fid) != args[0]; |
| 434 | fid = get_prev_frame (fid)) |
| 435 | ; |
| 436 | |
| 437 | if (fid) |
| 438 | while ((tfid = get_prev_frame (fid)) && |
| 439 | (FRAME_FP (tfid) == args[0])) |
| 440 | fid = tfid; |
| 441 | |
| 442 | /* We couldn't identify the frame as an existing frame, but |
| 443 | perhaps we can create one with a single argument. */ |
| 444 | } |
| 445 | |
| 446 | default: |
| 447 | #ifdef SETUP_ARBITRARY_FRAME |
| 448 | return SETUP_ARBITRARY_FRAME (numargs, args); |
| 449 | #else |
| 450 | /* Usual case. Do it here rather than have everyone supply |
| 451 | a SETUP_ARBITRARY_FRAME that does this. */ |
| 452 | if (numargs == 1) |
| 453 | return create_new_frame (args[0], 0); |
| 454 | error ("Too many args in frame specification"); |
| 455 | #endif |
| 456 | /* NOTREACHED */ |
| 457 | } |
| 458 | /* NOTREACHED */ |
| 459 | } |
| 460 | |
| 461 | /* FRAME_ARGS_ADDRESS_CORRECT is just like FRAME_ARGS_ADDRESS except |
| 462 | that if it is unsure about the answer, it returns 0 |
| 463 | instead of guessing (this happens on the VAX and i960, for example). |
| 464 | |
| 465 | On most machines, we never have to guess about the args address, |
| 466 | so FRAME_ARGS_ADDRESS{,_CORRECT} are the same. */ |
| 467 | #if !defined (FRAME_ARGS_ADDRESS_CORRECT) |
| 468 | #define FRAME_ARGS_ADDRESS_CORRECT FRAME_ARGS_ADDRESS |
| 469 | #endif |
| 470 | |
| 471 | /* Print verbosely the selected frame or the frame at address ADDR. |
| 472 | This means absolutely all information in the frame is printed. */ |
| 473 | |
| 474 | static void |
| 475 | frame_info (addr_exp, from_tty) |
| 476 | char *addr_exp; |
| 477 | int from_tty; |
| 478 | { |
| 479 | FRAME frame; |
| 480 | struct frame_info *fi; |
| 481 | struct frame_saved_regs fsr; |
| 482 | struct symtab_and_line sal; |
| 483 | struct symbol *func; |
| 484 | struct symtab *s; |
| 485 | FRAME calling_frame; |
| 486 | int i, count; |
| 487 | char *funname = 0; |
| 488 | enum language funlang = language_unknown; |
| 489 | |
| 490 | if (!target_has_stack) |
| 491 | error ("No stack."); |
| 492 | |
| 493 | frame = parse_frame_specification (addr_exp); |
| 494 | if (!frame) |
| 495 | error ("Invalid frame specified."); |
| 496 | |
| 497 | fi = get_frame_info (frame); |
| 498 | sal = find_pc_line (fi->pc, |
| 499 | fi->next != NULL |
| 500 | && !fi->next->signal_handler_caller |
| 501 | && !frame_in_dummy (fi->next)); |
| 502 | func = get_frame_function (frame); |
| 503 | s = find_pc_symtab(fi->pc); |
| 504 | if (func) |
| 505 | { |
| 506 | funname = SYMBOL_NAME (func); |
| 507 | funlang = SYMBOL_LANGUAGE (func); |
| 508 | } |
| 509 | else |
| 510 | { |
| 511 | register struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc); |
| 512 | if (msymbol != NULL) |
| 513 | { |
| 514 | funname = SYMBOL_NAME (msymbol); |
| 515 | funlang = SYMBOL_LANGUAGE (msymbol); |
| 516 | } |
| 517 | } |
| 518 | calling_frame = get_prev_frame (frame); |
| 519 | |
| 520 | if (!addr_exp && selected_frame_level >= 0) |
| 521 | { |
| 522 | printf_filtered ("Stack level %d, frame at ", selected_frame_level); |
| 523 | print_address_numeric (FRAME_FP(frame), 1, gdb_stdout); |
| 524 | printf_filtered (":\n"); |
| 525 | } |
| 526 | else |
| 527 | { |
| 528 | printf_filtered ("Stack frame at "); |
| 529 | print_address_numeric (FRAME_FP(frame), 1, gdb_stdout); |
| 530 | printf_filtered (":\n"); |
| 531 | } |
| 532 | printf_filtered (" %s = ", |
| 533 | reg_names[PC_REGNUM]); |
| 534 | print_address_numeric (fi->pc, 1, gdb_stdout); |
| 535 | |
| 536 | wrap_here (" "); |
| 537 | if (funname) |
| 538 | { |
| 539 | printf_filtered (" in "); |
| 540 | fprintf_symbol_filtered (gdb_stdout, funname, funlang, |
| 541 | DMGL_ANSI | DMGL_PARAMS); |
| 542 | } |
| 543 | wrap_here (" "); |
| 544 | if (sal.symtab) |
| 545 | printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line); |
| 546 | puts_filtered ("; "); |
| 547 | wrap_here (" "); |
| 548 | printf_filtered ("saved %s ", reg_names[PC_REGNUM]); |
| 549 | print_address_numeric (FRAME_SAVED_PC (frame), 1, gdb_stdout); |
| 550 | printf_filtered ("\n"); |
| 551 | |
| 552 | { |
| 553 | int frameless = 0; |
| 554 | #ifdef FRAMELESS_FUNCTION_INVOCATION |
| 555 | FRAMELESS_FUNCTION_INVOCATION (fi, frameless); |
| 556 | #endif |
| 557 | if (frameless) |
| 558 | printf_filtered (" (FRAMELESS),"); |
| 559 | } |
| 560 | |
| 561 | if (calling_frame) |
| 562 | { |
| 563 | printf_filtered (" called by frame at "); |
| 564 | print_address_numeric (FRAME_FP (calling_frame), 1, gdb_stdout); |
| 565 | } |
| 566 | if (fi->next && calling_frame) |
| 567 | puts_filtered (","); |
| 568 | wrap_here (" "); |
| 569 | if (fi->next) |
| 570 | { |
| 571 | printf_filtered (" caller of frame at "); |
| 572 | print_address_numeric (fi->next->frame, 1, gdb_stdout); |
| 573 | } |
| 574 | if (fi->next || calling_frame) |
| 575 | puts_filtered ("\n"); |
| 576 | if (s) |
| 577 | printf_filtered (" source language %s.\n", language_str (s->language)); |
| 578 | |
| 579 | #ifdef PRINT_EXTRA_FRAME_INFO |
| 580 | PRINT_EXTRA_FRAME_INFO (fi); |
| 581 | #endif |
| 582 | |
| 583 | { |
| 584 | /* Address of the argument list for this frame, or 0. */ |
| 585 | CORE_ADDR arg_list = FRAME_ARGS_ADDRESS_CORRECT (fi); |
| 586 | /* Number of args for this frame, or -1 if unknown. */ |
| 587 | int numargs; |
| 588 | |
| 589 | if (arg_list == 0) |
| 590 | printf_filtered (" Arglist at unknown address.\n"); |
| 591 | else |
| 592 | { |
| 593 | printf_filtered (" Arglist at "); |
| 594 | print_address_numeric (arg_list, 1, gdb_stdout); |
| 595 | printf_filtered (","); |
| 596 | |
| 597 | FRAME_NUM_ARGS (numargs, fi); |
| 598 | if (numargs < 0) |
| 599 | puts_filtered (" args: "); |
| 600 | else if (numargs == 0) |
| 601 | puts_filtered (" no args."); |
| 602 | else if (numargs == 1) |
| 603 | puts_filtered (" 1 arg: "); |
| 604 | else |
| 605 | printf_filtered (" %d args: ", numargs); |
| 606 | print_frame_args (func, fi, numargs, gdb_stdout); |
| 607 | puts_filtered ("\n"); |
| 608 | } |
| 609 | } |
| 610 | { |
| 611 | /* Address of the local variables for this frame, or 0. */ |
| 612 | CORE_ADDR arg_list = FRAME_LOCALS_ADDRESS (fi); |
| 613 | |
| 614 | if (arg_list == 0) |
| 615 | printf_filtered (" Locals at unknown address,"); |
| 616 | else |
| 617 | { |
| 618 | printf_filtered (" Locals at "); |
| 619 | print_address_numeric (arg_list, 1, gdb_stdout); |
| 620 | printf_filtered (","); |
| 621 | } |
| 622 | } |
| 623 | |
| 624 | #if defined (FRAME_FIND_SAVED_REGS) |
| 625 | get_frame_saved_regs (fi, &fsr); |
| 626 | /* The sp is special; what's returned isn't the save address, but |
| 627 | actually the value of the previous frame's sp. */ |
| 628 | printf_filtered (" Previous frame's sp is "); |
| 629 | print_address_numeric (fsr.regs[SP_REGNUM], 1, gdb_stdout); |
| 630 | printf_filtered ("\n"); |
| 631 | count = 0; |
| 632 | for (i = 0; i < NUM_REGS; i++) |
| 633 | if (fsr.regs[i] && i != SP_REGNUM) |
| 634 | { |
| 635 | if (count == 0) |
| 636 | puts_filtered (" Saved registers:\n "); |
| 637 | else |
| 638 | puts_filtered (","); |
| 639 | wrap_here (" "); |
| 640 | printf_filtered (" %s at ", reg_names[i]); |
| 641 | print_address_numeric (fsr.regs[i], 1, gdb_stdout); |
| 642 | count++; |
| 643 | } |
| 644 | if (count) |
| 645 | puts_filtered ("\n"); |
| 646 | #else /* Have FRAME_FIND_SAVED_REGS. */ |
| 647 | puts_filtered ("\n"); |
| 648 | #endif /* Have FRAME_FIND_SAVED_REGS. */ |
| 649 | } |
| 650 | |
| 651 | #if 0 |
| 652 | /* Set a limit on the number of frames printed by default in a |
| 653 | backtrace. */ |
| 654 | |
| 655 | static int backtrace_limit; |
| 656 | |
| 657 | static void |
| 658 | set_backtrace_limit_command (count_exp, from_tty) |
| 659 | char *count_exp; |
| 660 | int from_tty; |
| 661 | { |
| 662 | int count = parse_and_eval_address (count_exp); |
| 663 | |
| 664 | if (count < 0) |
| 665 | error ("Negative argument not meaningful as backtrace limit."); |
| 666 | |
| 667 | backtrace_limit = count; |
| 668 | } |
| 669 | |
| 670 | static void |
| 671 | backtrace_limit_info (arg, from_tty) |
| 672 | char *arg; |
| 673 | int from_tty; |
| 674 | { |
| 675 | if (arg) |
| 676 | error ("\"Info backtrace-limit\" takes no arguments."); |
| 677 | |
| 678 | printf_unfiltered ("Backtrace limit: %d.\n", backtrace_limit); |
| 679 | } |
| 680 | #endif |
| 681 | |
| 682 | /* Print briefly all stack frames or just the innermost COUNT frames. */ |
| 683 | |
| 684 | static void |
| 685 | backtrace_command (count_exp, from_tty) |
| 686 | char *count_exp; |
| 687 | int from_tty; |
| 688 | { |
| 689 | struct frame_info *fi; |
| 690 | register int count; |
| 691 | register FRAME frame; |
| 692 | register int i; |
| 693 | register FRAME trailing; |
| 694 | register int trailing_level; |
| 695 | |
| 696 | if (!target_has_stack) |
| 697 | error ("No stack."); |
| 698 | |
| 699 | /* The following code must do two things. First, it must |
| 700 | set the variable TRAILING to the frame from which we should start |
| 701 | printing. Second, it must set the variable count to the number |
| 702 | of frames which we should print, or -1 if all of them. */ |
| 703 | trailing = get_current_frame (); |
| 704 | trailing_level = 0; |
| 705 | if (count_exp) |
| 706 | { |
| 707 | count = parse_and_eval_address (count_exp); |
| 708 | if (count < 0) |
| 709 | { |
| 710 | FRAME current; |
| 711 | |
| 712 | count = -count; |
| 713 | |
| 714 | current = trailing; |
| 715 | while (current && count--) |
| 716 | { |
| 717 | QUIT; |
| 718 | current = get_prev_frame (current); |
| 719 | } |
| 720 | |
| 721 | /* Will stop when CURRENT reaches the top of the stack. TRAILING |
| 722 | will be COUNT below it. */ |
| 723 | while (current) |
| 724 | { |
| 725 | QUIT; |
| 726 | trailing = get_prev_frame (trailing); |
| 727 | current = get_prev_frame (current); |
| 728 | trailing_level++; |
| 729 | } |
| 730 | |
| 731 | count = -1; |
| 732 | } |
| 733 | } |
| 734 | else |
| 735 | count = -1; |
| 736 | |
| 737 | if (info_verbose) |
| 738 | { |
| 739 | struct partial_symtab *ps; |
| 740 | |
| 741 | /* Read in symbols for all of the frames. Need to do this in |
| 742 | a separate pass so that "Reading in symbols for xxx" messages |
| 743 | don't screw up the appearance of the backtrace. Also |
| 744 | if people have strong opinions against reading symbols for |
| 745 | backtrace this may have to be an option. */ |
| 746 | i = count; |
| 747 | for (frame = trailing; |
| 748 | frame != NULL && i--; |
| 749 | frame = get_prev_frame (frame)) |
| 750 | { |
| 751 | QUIT; |
| 752 | fi = get_frame_info (frame); |
| 753 | ps = find_pc_psymtab (fi->pc); |
| 754 | if (ps) |
| 755 | PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in */ |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | for (i = 0, frame = trailing; |
| 760 | frame && count--; |
| 761 | i++, frame = get_prev_frame (frame)) |
| 762 | { |
| 763 | QUIT; |
| 764 | fi = get_frame_info (frame); |
| 765 | |
| 766 | /* Don't use print_stack_frame; if an error() occurs it probably |
| 767 | means further attempts to backtrace would fail (on the other |
| 768 | hand, perhaps the code does or could be fixed to make sure |
| 769 | the frame->prev field gets set to NULL in that case). */ |
| 770 | print_frame_info (fi, trailing_level + i, 0, 1); |
| 771 | } |
| 772 | |
| 773 | /* If we've stopped before the end, mention that. */ |
| 774 | if (frame && from_tty) |
| 775 | printf_filtered ("(More stack frames follow...)\n"); |
| 776 | } |
| 777 | \f |
| 778 | /* Print the local variables of a block B active in FRAME. |
| 779 | Return 1 if any variables were printed; 0 otherwise. */ |
| 780 | |
| 781 | static int |
| 782 | print_block_frame_locals (b, frame, stream) |
| 783 | struct block *b; |
| 784 | register FRAME frame; |
| 785 | register GDB_FILE *stream; |
| 786 | { |
| 787 | int nsyms; |
| 788 | register int i; |
| 789 | register struct symbol *sym; |
| 790 | register int values_printed = 0; |
| 791 | |
| 792 | nsyms = BLOCK_NSYMS (b); |
| 793 | |
| 794 | for (i = 0; i < nsyms; i++) |
| 795 | { |
| 796 | sym = BLOCK_SYM (b, i); |
| 797 | switch (SYMBOL_CLASS (sym)) |
| 798 | { |
| 799 | case LOC_LOCAL: |
| 800 | case LOC_REGISTER: |
| 801 | case LOC_STATIC: |
| 802 | case LOC_BASEREG: |
| 803 | values_printed = 1; |
| 804 | fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream); |
| 805 | fputs_filtered (" = ", stream); |
| 806 | print_variable_value (sym, frame, stream); |
| 807 | fprintf_filtered (stream, "\n"); |
| 808 | break; |
| 809 | |
| 810 | default: |
| 811 | /* Ignore symbols which are not locals. */ |
| 812 | break; |
| 813 | } |
| 814 | } |
| 815 | return values_printed; |
| 816 | } |
| 817 | |
| 818 | /* Same, but print labels. */ |
| 819 | |
| 820 | static int |
| 821 | print_block_frame_labels (b, have_default, stream) |
| 822 | struct block *b; |
| 823 | int *have_default; |
| 824 | register GDB_FILE *stream; |
| 825 | { |
| 826 | int nsyms; |
| 827 | register int i; |
| 828 | register struct symbol *sym; |
| 829 | register int values_printed = 0; |
| 830 | |
| 831 | nsyms = BLOCK_NSYMS (b); |
| 832 | |
| 833 | for (i = 0; i < nsyms; i++) |
| 834 | { |
| 835 | sym = BLOCK_SYM (b, i); |
| 836 | if (STREQ (SYMBOL_NAME (sym), "default")) |
| 837 | { |
| 838 | if (*have_default) |
| 839 | continue; |
| 840 | *have_default = 1; |
| 841 | } |
| 842 | if (SYMBOL_CLASS (sym) == LOC_LABEL) |
| 843 | { |
| 844 | struct symtab_and_line sal; |
| 845 | sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0); |
| 846 | values_printed = 1; |
| 847 | fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream); |
| 848 | if (addressprint) |
| 849 | { |
| 850 | fprintf_filtered (stream, " "); |
| 851 | print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream); |
| 852 | } |
| 853 | fprintf_filtered (stream, " in file %s, line %d\n", |
| 854 | sal.symtab->filename, sal.line); |
| 855 | } |
| 856 | } |
| 857 | return values_printed; |
| 858 | } |
| 859 | |
| 860 | /* Print on STREAM all the local variables in frame FRAME, |
| 861 | including all the blocks active in that frame |
| 862 | at its current pc. |
| 863 | |
| 864 | Returns 1 if the job was done, |
| 865 | or 0 if nothing was printed because we have no info |
| 866 | on the function running in FRAME. */ |
| 867 | |
| 868 | static void |
| 869 | print_frame_local_vars (frame, stream) |
| 870 | register FRAME frame; |
| 871 | register GDB_FILE *stream; |
| 872 | { |
| 873 | register struct block *block = get_frame_block (frame); |
| 874 | register int values_printed = 0; |
| 875 | |
| 876 | if (block == 0) |
| 877 | { |
| 878 | fprintf_filtered (stream, "No symbol table info available.\n"); |
| 879 | return; |
| 880 | } |
| 881 | |
| 882 | while (block != 0) |
| 883 | { |
| 884 | if (print_block_frame_locals (block, frame, stream)) |
| 885 | values_printed = 1; |
| 886 | /* After handling the function's top-level block, stop. |
| 887 | Don't continue to its superblock, the block of |
| 888 | per-file symbols. */ |
| 889 | if (BLOCK_FUNCTION (block)) |
| 890 | break; |
| 891 | block = BLOCK_SUPERBLOCK (block); |
| 892 | } |
| 893 | |
| 894 | if (!values_printed) |
| 895 | { |
| 896 | fprintf_filtered (stream, "No locals.\n"); |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | /* Same, but print labels. */ |
| 901 | |
| 902 | static void |
| 903 | print_frame_label_vars (frame, this_level_only, stream) |
| 904 | register FRAME frame; |
| 905 | int this_level_only; |
| 906 | register GDB_FILE *stream; |
| 907 | { |
| 908 | register struct blockvector *bl; |
| 909 | register struct block *block = get_frame_block (frame); |
| 910 | register int values_printed = 0; |
| 911 | int index, have_default = 0; |
| 912 | char *blocks_printed; |
| 913 | struct frame_info *fi = get_frame_info (frame); |
| 914 | CORE_ADDR pc = fi->pc; |
| 915 | |
| 916 | if (block == 0) |
| 917 | { |
| 918 | fprintf_filtered (stream, "No symbol table info available.\n"); |
| 919 | return; |
| 920 | } |
| 921 | |
| 922 | bl = blockvector_for_pc (BLOCK_END (block) - 4, &index); |
| 923 | blocks_printed = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char)); |
| 924 | memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char)); |
| 925 | |
| 926 | while (block != 0) |
| 927 | { |
| 928 | CORE_ADDR end = BLOCK_END (block) - 4; |
| 929 | int last_index; |
| 930 | |
| 931 | if (bl != blockvector_for_pc (end, &index)) |
| 932 | error ("blockvector blotch"); |
| 933 | if (BLOCKVECTOR_BLOCK (bl, index) != block) |
| 934 | error ("blockvector botch"); |
| 935 | last_index = BLOCKVECTOR_NBLOCKS (bl); |
| 936 | index += 1; |
| 937 | |
| 938 | /* Don't print out blocks that have gone by. */ |
| 939 | while (index < last_index |
| 940 | && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc) |
| 941 | index++; |
| 942 | |
| 943 | while (index < last_index |
| 944 | && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end) |
| 945 | { |
| 946 | if (blocks_printed[index] == 0) |
| 947 | { |
| 948 | if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), &have_default, stream)) |
| 949 | values_printed = 1; |
| 950 | blocks_printed[index] = 1; |
| 951 | } |
| 952 | index++; |
| 953 | } |
| 954 | if (have_default) |
| 955 | return; |
| 956 | if (values_printed && this_level_only) |
| 957 | return; |
| 958 | |
| 959 | /* After handling the function's top-level block, stop. |
| 960 | Don't continue to its superblock, the block of |
| 961 | per-file symbols. */ |
| 962 | if (BLOCK_FUNCTION (block)) |
| 963 | break; |
| 964 | block = BLOCK_SUPERBLOCK (block); |
| 965 | } |
| 966 | |
| 967 | if (!values_printed && !this_level_only) |
| 968 | { |
| 969 | fprintf_filtered (stream, "No catches.\n"); |
| 970 | } |
| 971 | } |
| 972 | |
| 973 | /* ARGSUSED */ |
| 974 | static void |
| 975 | locals_info (args, from_tty) |
| 976 | char *args; |
| 977 | int from_tty; |
| 978 | { |
| 979 | if (!selected_frame) |
| 980 | error ("No frame selected."); |
| 981 | print_frame_local_vars (selected_frame, gdb_stdout); |
| 982 | } |
| 983 | |
| 984 | static void |
| 985 | catch_info (ignore, from_tty) |
| 986 | char *ignore; |
| 987 | int from_tty; |
| 988 | { |
| 989 | if (!selected_frame) |
| 990 | error ("No frame selected."); |
| 991 | print_frame_label_vars (selected_frame, 0, gdb_stdout); |
| 992 | } |
| 993 | |
| 994 | static void |
| 995 | print_frame_arg_vars (frame, stream) |
| 996 | register FRAME frame; |
| 997 | register GDB_FILE *stream; |
| 998 | { |
| 999 | struct symbol *func = get_frame_function (frame); |
| 1000 | register struct block *b; |
| 1001 | int nsyms; |
| 1002 | register int i; |
| 1003 | register struct symbol *sym, *sym2; |
| 1004 | register int values_printed = 0; |
| 1005 | |
| 1006 | if (func == 0) |
| 1007 | { |
| 1008 | fprintf_filtered (stream, "No symbol table info available.\n"); |
| 1009 | return; |
| 1010 | } |
| 1011 | |
| 1012 | b = SYMBOL_BLOCK_VALUE (func); |
| 1013 | nsyms = BLOCK_NSYMS (b); |
| 1014 | |
| 1015 | for (i = 0; i < nsyms; i++) |
| 1016 | { |
| 1017 | sym = BLOCK_SYM (b, i); |
| 1018 | switch (SYMBOL_CLASS (sym)) |
| 1019 | { |
| 1020 | case LOC_ARG: |
| 1021 | case LOC_LOCAL_ARG: |
| 1022 | case LOC_REF_ARG: |
| 1023 | case LOC_REGPARM: |
| 1024 | case LOC_REGPARM_ADDR: |
| 1025 | case LOC_BASEREG_ARG: |
| 1026 | values_printed = 1; |
| 1027 | fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream); |
| 1028 | fputs_filtered (" = ", stream); |
| 1029 | |
| 1030 | /* We have to look up the symbol because arguments can have |
| 1031 | two entries (one a parameter, one a local) and the one we |
| 1032 | want is the local, which lookup_symbol will find for us. |
| 1033 | This includes gcc1 (not gcc2) on the sparc when passing a |
| 1034 | small structure and gcc2 when the argument type is float |
| 1035 | and it is passed as a double and converted to float by |
| 1036 | the prologue (in the latter case the type of the LOC_ARG |
| 1037 | symbol is double and the type of the LOC_LOCAL symbol is |
| 1038 | float). There are also LOC_ARG/LOC_REGISTER pairs which |
| 1039 | are not combined in symbol-reading. */ |
| 1040 | |
| 1041 | sym2 = lookup_symbol (SYMBOL_NAME (sym), |
| 1042 | b, VAR_NAMESPACE, (int *)NULL, (struct symtab **)NULL); |
| 1043 | print_variable_value (sym2, frame, stream); |
| 1044 | fprintf_filtered (stream, "\n"); |
| 1045 | break; |
| 1046 | |
| 1047 | default: |
| 1048 | /* Don't worry about things which aren't arguments. */ |
| 1049 | break; |
| 1050 | } |
| 1051 | } |
| 1052 | |
| 1053 | if (!values_printed) |
| 1054 | { |
| 1055 | fprintf_filtered (stream, "No arguments.\n"); |
| 1056 | } |
| 1057 | } |
| 1058 | |
| 1059 | static void |
| 1060 | args_info (ignore, from_tty) |
| 1061 | char *ignore; |
| 1062 | int from_tty; |
| 1063 | { |
| 1064 | if (!selected_frame) |
| 1065 | error ("No frame selected."); |
| 1066 | print_frame_arg_vars (selected_frame, gdb_stdout); |
| 1067 | } |
| 1068 | \f |
| 1069 | /* Select frame FRAME, and note that its stack level is LEVEL. |
| 1070 | LEVEL may be -1 if an actual level number is not known. */ |
| 1071 | |
| 1072 | void |
| 1073 | select_frame (frame, level) |
| 1074 | FRAME frame; |
| 1075 | int level; |
| 1076 | { |
| 1077 | register struct symtab *s; |
| 1078 | |
| 1079 | selected_frame = frame; |
| 1080 | selected_frame_level = level; |
| 1081 | |
| 1082 | /* Ensure that symbols for this frame are read in. Also, determine the |
| 1083 | source language of this frame, and switch to it if desired. */ |
| 1084 | if (frame) |
| 1085 | { |
| 1086 | s = find_pc_symtab (get_frame_info (frame)->pc); |
| 1087 | if (s |
| 1088 | && s->language != current_language->la_language |
| 1089 | && s->language != language_unknown |
| 1090 | && language_mode == language_mode_auto) { |
| 1091 | set_language(s->language); |
| 1092 | } |
| 1093 | } |
| 1094 | } |
| 1095 | |
| 1096 | /* Store the selected frame and its level into *FRAMEP and *LEVELP. |
| 1097 | If there is no selected frame, *FRAMEP is set to NULL. */ |
| 1098 | |
| 1099 | void |
| 1100 | record_selected_frame (frameaddrp, levelp) |
| 1101 | FRAME_ADDR *frameaddrp; |
| 1102 | int *levelp; |
| 1103 | { |
| 1104 | *frameaddrp = selected_frame ? FRAME_FP (selected_frame) : 0; |
| 1105 | *levelp = selected_frame_level; |
| 1106 | } |
| 1107 | |
| 1108 | /* Return the symbol-block in which the selected frame is executing. |
| 1109 | Can return zero under various legitimate circumstances. */ |
| 1110 | |
| 1111 | struct block * |
| 1112 | get_selected_block () |
| 1113 | { |
| 1114 | if (!target_has_stack) |
| 1115 | return 0; |
| 1116 | |
| 1117 | if (!selected_frame) |
| 1118 | return get_current_block (); |
| 1119 | return get_frame_block (selected_frame); |
| 1120 | } |
| 1121 | |
| 1122 | /* Find a frame a certain number of levels away from FRAME. |
| 1123 | LEVEL_OFFSET_PTR points to an int containing the number of levels. |
| 1124 | Positive means go to earlier frames (up); negative, the reverse. |
| 1125 | The int that contains the number of levels is counted toward |
| 1126 | zero as the frames for those levels are found. |
| 1127 | If the top or bottom frame is reached, that frame is returned, |
| 1128 | but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates |
| 1129 | how much farther the original request asked to go. */ |
| 1130 | |
| 1131 | FRAME |
| 1132 | find_relative_frame (frame, level_offset_ptr) |
| 1133 | register FRAME frame; |
| 1134 | register int* level_offset_ptr; |
| 1135 | { |
| 1136 | register FRAME prev; |
| 1137 | register FRAME frame1; |
| 1138 | |
| 1139 | /* Going up is simple: just do get_prev_frame enough times |
| 1140 | or until initial frame is reached. */ |
| 1141 | while (*level_offset_ptr > 0) |
| 1142 | { |
| 1143 | prev = get_prev_frame (frame); |
| 1144 | if (prev == 0) |
| 1145 | break; |
| 1146 | (*level_offset_ptr)--; |
| 1147 | frame = prev; |
| 1148 | } |
| 1149 | /* Going down is just as simple. */ |
| 1150 | if (*level_offset_ptr < 0) |
| 1151 | { |
| 1152 | while (*level_offset_ptr < 0) { |
| 1153 | frame1 = get_next_frame (frame); |
| 1154 | if (!frame1) |
| 1155 | break; |
| 1156 | frame = frame1; |
| 1157 | (*level_offset_ptr)++; |
| 1158 | } |
| 1159 | } |
| 1160 | return frame; |
| 1161 | } |
| 1162 | |
| 1163 | /* The "select_frame" command. With no arg, NOP. |
| 1164 | With arg LEVEL_EXP, select the frame at level LEVEL if it is a |
| 1165 | valid level. Otherwise, treat level_exp as an address expression |
| 1166 | and select it. See parse_frame_specification for more info on proper |
| 1167 | frame expressions. */ |
| 1168 | |
| 1169 | /* ARGSUSED */ |
| 1170 | static void |
| 1171 | select_frame_command (level_exp, from_tty) |
| 1172 | char *level_exp; |
| 1173 | int from_tty; |
| 1174 | { |
| 1175 | register FRAME frame, frame1; |
| 1176 | unsigned int level = 0; |
| 1177 | |
| 1178 | if (!target_has_stack) |
| 1179 | error ("No stack."); |
| 1180 | |
| 1181 | frame = parse_frame_specification (level_exp); |
| 1182 | |
| 1183 | /* Try to figure out what level this frame is. But if there is |
| 1184 | no current stack, don't error out -- let the user set one. */ |
| 1185 | frame1 = 0; |
| 1186 | if (get_current_frame()) { |
| 1187 | for (frame1 = get_prev_frame (0); |
| 1188 | frame1 && frame1 != frame; |
| 1189 | frame1 = get_prev_frame (frame1)) |
| 1190 | level++; |
| 1191 | } |
| 1192 | |
| 1193 | if (!frame1) |
| 1194 | level = 0; |
| 1195 | |
| 1196 | select_frame (frame, level); |
| 1197 | } |
| 1198 | |
| 1199 | /* The "frame" command. With no arg, print selected frame briefly. |
| 1200 | With arg, behaves like select_frame and then prints the selected |
| 1201 | frame. */ |
| 1202 | |
| 1203 | static void |
| 1204 | frame_command (level_exp, from_tty) |
| 1205 | char *level_exp; |
| 1206 | int from_tty; |
| 1207 | { |
| 1208 | select_frame_command (level_exp, from_tty); |
| 1209 | print_stack_frame (selected_frame, selected_frame_level, 1); |
| 1210 | } |
| 1211 | |
| 1212 | /* Select the frame up one or COUNT stack levels |
| 1213 | from the previously selected frame, and print it briefly. */ |
| 1214 | |
| 1215 | /* ARGSUSED */ |
| 1216 | static void |
| 1217 | up_silently_command (count_exp, from_tty) |
| 1218 | char *count_exp; |
| 1219 | int from_tty; |
| 1220 | { |
| 1221 | register FRAME frame; |
| 1222 | int count = 1, count1; |
| 1223 | if (count_exp) |
| 1224 | count = parse_and_eval_address (count_exp); |
| 1225 | count1 = count; |
| 1226 | |
| 1227 | if (target_has_stack == 0 || selected_frame == 0) |
| 1228 | error ("No stack."); |
| 1229 | |
| 1230 | frame = find_relative_frame (selected_frame, &count1); |
| 1231 | if (count1 != 0 && count_exp == 0) |
| 1232 | error ("Initial frame selected; you cannot go up."); |
| 1233 | select_frame (frame, selected_frame_level + count - count1); |
| 1234 | } |
| 1235 | |
| 1236 | static void |
| 1237 | up_command (count_exp, from_tty) |
| 1238 | char *count_exp; |
| 1239 | int from_tty; |
| 1240 | { |
| 1241 | up_silently_command (count_exp, from_tty); |
| 1242 | print_stack_frame (selected_frame, selected_frame_level, 1); |
| 1243 | } |
| 1244 | |
| 1245 | /* Select the frame down one or COUNT stack levels |
| 1246 | from the previously selected frame, and print it briefly. */ |
| 1247 | |
| 1248 | /* ARGSUSED */ |
| 1249 | static void |
| 1250 | down_silently_command (count_exp, from_tty) |
| 1251 | char *count_exp; |
| 1252 | int from_tty; |
| 1253 | { |
| 1254 | register FRAME frame; |
| 1255 | int count = -1, count1; |
| 1256 | if (count_exp) |
| 1257 | count = - parse_and_eval_address (count_exp); |
| 1258 | count1 = count; |
| 1259 | |
| 1260 | if (target_has_stack == 0 || selected_frame == 0) |
| 1261 | error ("No stack."); |
| 1262 | |
| 1263 | frame = find_relative_frame (selected_frame, &count1); |
| 1264 | if (count1 != 0 && count_exp == 0) |
| 1265 | { |
| 1266 | |
| 1267 | /* We only do this if count_exp is not specified. That way "down" |
| 1268 | means to really go down (and let me know if that is |
| 1269 | impossible), but "down 9999" can be used to mean go all the way |
| 1270 | down without getting an error. */ |
| 1271 | |
| 1272 | error ("Bottom (i.e., innermost) frame selected; you cannot go down."); |
| 1273 | } |
| 1274 | |
| 1275 | select_frame (frame, selected_frame_level + count - count1); |
| 1276 | } |
| 1277 | |
| 1278 | |
| 1279 | static void |
| 1280 | down_command (count_exp, from_tty) |
| 1281 | char *count_exp; |
| 1282 | int from_tty; |
| 1283 | { |
| 1284 | down_silently_command (count_exp, from_tty); |
| 1285 | print_stack_frame (selected_frame, selected_frame_level, 1); |
| 1286 | } |
| 1287 | \f |
| 1288 | static void |
| 1289 | return_command (retval_exp, from_tty) |
| 1290 | char *retval_exp; |
| 1291 | int from_tty; |
| 1292 | { |
| 1293 | struct symbol *thisfun; |
| 1294 | FRAME_ADDR selected_frame_addr; |
| 1295 | CORE_ADDR selected_frame_pc; |
| 1296 | FRAME frame; |
| 1297 | value_ptr return_value = NULL; |
| 1298 | |
| 1299 | if (selected_frame == NULL) |
| 1300 | error ("No selected frame."); |
| 1301 | thisfun = get_frame_function (selected_frame); |
| 1302 | selected_frame_addr = FRAME_FP (selected_frame); |
| 1303 | selected_frame_pc = (get_frame_info (selected_frame))->pc; |
| 1304 | |
| 1305 | /* Compute the return value (if any -- possibly getting errors here). */ |
| 1306 | |
| 1307 | if (retval_exp) |
| 1308 | { |
| 1309 | return_value = parse_and_eval (retval_exp); |
| 1310 | |
| 1311 | /* Make sure we have fully evaluated it, since |
| 1312 | it might live in the stack frame we're about to pop. */ |
| 1313 | if (VALUE_LAZY (return_value)) |
| 1314 | value_fetch_lazy (return_value); |
| 1315 | } |
| 1316 | |
| 1317 | /* If interactive, require confirmation. */ |
| 1318 | |
| 1319 | if (from_tty) |
| 1320 | { |
| 1321 | if (thisfun != 0) |
| 1322 | { |
| 1323 | if (!query ("Make %s return now? ", SYMBOL_SOURCE_NAME (thisfun))) |
| 1324 | { |
| 1325 | error ("Not confirmed."); |
| 1326 | /* NOTREACHED */ |
| 1327 | } |
| 1328 | } |
| 1329 | else |
| 1330 | if (!query ("Make selected stack frame return now? ")) |
| 1331 | error ("Not confirmed."); |
| 1332 | } |
| 1333 | |
| 1334 | /* Do the real work. Pop until the specified frame is current. We |
| 1335 | use this method because the selected_frame is not valid after |
| 1336 | a POP_FRAME. The pc comparison makes this work even if the |
| 1337 | selected frame shares its fp with another frame. */ |
| 1338 | |
| 1339 | while ( selected_frame_addr != FRAME_FP (frame = get_current_frame()) |
| 1340 | || selected_frame_pc != (get_frame_info (frame))->pc ) |
| 1341 | POP_FRAME; |
| 1342 | |
| 1343 | /* Then pop that frame. */ |
| 1344 | |
| 1345 | POP_FRAME; |
| 1346 | |
| 1347 | /* Compute the return value (if any) and store in the place |
| 1348 | for return values. */ |
| 1349 | |
| 1350 | if (retval_exp) |
| 1351 | set_return_value (return_value); |
| 1352 | |
| 1353 | /* If interactive, print the frame that is now current. */ |
| 1354 | |
| 1355 | if (from_tty) |
| 1356 | frame_command ("0", 1); |
| 1357 | } |
| 1358 | |
| 1359 | /* Gets the language of the current frame. */ |
| 1360 | enum language |
| 1361 | get_frame_language() |
| 1362 | { |
| 1363 | register struct symtab *s; |
| 1364 | FRAME fr; |
| 1365 | enum language flang; /* The language of the current frame */ |
| 1366 | |
| 1367 | fr = get_frame_info(selected_frame); |
| 1368 | if(fr) |
| 1369 | { |
| 1370 | s = find_pc_symtab(fr->pc); |
| 1371 | if(s) |
| 1372 | flang = s->language; |
| 1373 | else |
| 1374 | flang = language_unknown; |
| 1375 | } |
| 1376 | else |
| 1377 | flang = language_unknown; |
| 1378 | |
| 1379 | return flang; |
| 1380 | } |
| 1381 | \f |
| 1382 | void |
| 1383 | _initialize_stack () |
| 1384 | { |
| 1385 | #if 0 |
| 1386 | backtrace_limit = 30; |
| 1387 | #endif |
| 1388 | |
| 1389 | add_com ("return", class_stack, return_command, |
| 1390 | "Make selected stack frame return to its caller.\n\ |
| 1391 | Control remains in the debugger, but when you continue\n\ |
| 1392 | execution will resume in the frame above the one now selected.\n\ |
| 1393 | If an argument is given, it is an expression for the value to return."); |
| 1394 | |
| 1395 | add_com ("up", class_stack, up_command, |
| 1396 | "Select and print stack frame that called this one.\n\ |
| 1397 | An argument says how many frames up to go."); |
| 1398 | add_com ("up-silently", class_support, up_silently_command, |
| 1399 | "Same as the `up' command, but does not print anything.\n\ |
| 1400 | This is useful in command scripts."); |
| 1401 | |
| 1402 | add_com ("down", class_stack, down_command, |
| 1403 | "Select and print stack frame called by this one.\n\ |
| 1404 | An argument says how many frames down to go."); |
| 1405 | add_com_alias ("do", "down", class_stack, 1); |
| 1406 | add_com_alias ("dow", "down", class_stack, 1); |
| 1407 | add_com ("down-silently", class_support, down_silently_command, |
| 1408 | "Same as the `down' command, but does not print anything.\n\ |
| 1409 | This is useful in command scripts."); |
| 1410 | |
| 1411 | add_com ("frame", class_stack, frame_command, |
| 1412 | "Select and print a stack frame.\n\ |
| 1413 | With no argument, print the selected stack frame. (See also \"info frame\").\n\ |
| 1414 | An argument specifies the frame to select.\n\ |
| 1415 | It can be a stack frame number or the address of the frame.\n\ |
| 1416 | With argument, nothing is printed if input is coming from\n\ |
| 1417 | a command file or a user-defined command."); |
| 1418 | |
| 1419 | add_com_alias ("f", "frame", class_stack, 1); |
| 1420 | |
| 1421 | add_com ("select-frame", class_stack, select_frame_command, |
| 1422 | "Select a stack frame without printing anything.\n\ |
| 1423 | An argument specifies the frame to select.\n\ |
| 1424 | It can be a stack frame number or the address of the frame.\n"); |
| 1425 | |
| 1426 | add_com ("backtrace", class_stack, backtrace_command, |
| 1427 | "Print backtrace of all stack frames, or innermost COUNT frames.\n\ |
| 1428 | With a negative argument, print outermost -COUNT frames."); |
| 1429 | add_com_alias ("bt", "backtrace", class_stack, 0); |
| 1430 | add_com_alias ("where", "backtrace", class_alias, 0); |
| 1431 | add_info ("stack", backtrace_command, |
| 1432 | "Backtrace of the stack, or innermost COUNT frames."); |
| 1433 | add_info_alias ("s", "stack", 1); |
| 1434 | add_info ("frame", frame_info, |
| 1435 | "All about selected stack frame, or frame at ADDR."); |
| 1436 | add_info_alias ("f", "frame", 1); |
| 1437 | add_info ("locals", locals_info, |
| 1438 | "Local variables of current stack frame."); |
| 1439 | add_info ("args", args_info, |
| 1440 | "Argument variables of current stack frame."); |
| 1441 | add_info ("catch", catch_info, |
| 1442 | "Exceptions that can be caught in the current stack frame."); |
| 1443 | |
| 1444 | #if 0 |
| 1445 | add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command, |
| 1446 | "Specify maximum number of frames for \"backtrace\" to print by default.", |
| 1447 | &setlist); |
| 1448 | add_info ("backtrace-limit", backtrace_limit_info, |
| 1449 | "The maximum number of frames for \"backtrace\" to print by default."); |
| 1450 | #endif |
| 1451 | } |