| 1 | /* Print and select stack frames for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
| 4 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, |
| 5 | 2009 Free 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "value.h" |
| 24 | #include "symtab.h" |
| 25 | #include "gdbtypes.h" |
| 26 | #include "expression.h" |
| 27 | #include "language.h" |
| 28 | #include "frame.h" |
| 29 | #include "gdbcmd.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "target.h" |
| 32 | #include "source.h" |
| 33 | #include "breakpoint.h" |
| 34 | #include "demangle.h" |
| 35 | #include "inferior.h" |
| 36 | #include "annotate.h" |
| 37 | #include "ui-out.h" |
| 38 | #include "block.h" |
| 39 | #include "stack.h" |
| 40 | #include "dictionary.h" |
| 41 | #include "exceptions.h" |
| 42 | #include "reggroups.h" |
| 43 | #include "regcache.h" |
| 44 | #include "solib.h" |
| 45 | #include "valprint.h" |
| 46 | #include "gdbthread.h" |
| 47 | #include "cp-support.h" |
| 48 | #include "disasm.h" |
| 49 | |
| 50 | #include "gdb_assert.h" |
| 51 | #include <ctype.h> |
| 52 | #include "gdb_string.h" |
| 53 | |
| 54 | void (*deprecated_selected_frame_level_changed_hook) (int); |
| 55 | |
| 56 | /* The possible choices of "set print frame-arguments, and the value |
| 57 | of this setting. */ |
| 58 | |
| 59 | static const char *print_frame_arguments_choices[] = |
| 60 | {"all", "scalars", "none", NULL}; |
| 61 | static const char *print_frame_arguments = "scalars"; |
| 62 | |
| 63 | /* Prototypes for local functions. */ |
| 64 | |
| 65 | static void print_frame_local_vars (struct frame_info *, int, |
| 66 | struct ui_file *); |
| 67 | |
| 68 | static void print_frame (struct frame_info *frame, int print_level, |
| 69 | enum print_what print_what, int print_args, |
| 70 | struct symtab_and_line sal); |
| 71 | |
| 72 | /* Zero means do things normally; we are interacting directly with the |
| 73 | user. One means print the full filename and linenumber when a |
| 74 | frame is printed, and do so in a format emacs18/emacs19.22 can |
| 75 | parse. Two means print similar annotations, but in many more |
| 76 | cases and in a slightly different syntax. */ |
| 77 | |
| 78 | int annotation_level = 0; |
| 79 | \f |
| 80 | |
| 81 | struct print_stack_frame_args |
| 82 | { |
| 83 | struct frame_info *frame; |
| 84 | int print_level; |
| 85 | enum print_what print_what; |
| 86 | int print_args; |
| 87 | }; |
| 88 | |
| 89 | /* Show or print the frame arguments; stub for catch_errors. */ |
| 90 | |
| 91 | static int |
| 92 | print_stack_frame_stub (void *args) |
| 93 | { |
| 94 | struct print_stack_frame_args *p = args; |
| 95 | int center = (p->print_what == SRC_LINE || p->print_what == SRC_AND_LOC); |
| 96 | |
| 97 | print_frame_info (p->frame, p->print_level, p->print_what, p->print_args); |
| 98 | set_current_sal_from_frame (p->frame, center); |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | /* Show or print a stack frame FRAME briefly. The output is format |
| 103 | according to PRINT_LEVEL and PRINT_WHAT printing the frame's |
| 104 | relative level, function name, argument list, and file name and |
| 105 | line number. If the frame's PC is not at the beginning of the |
| 106 | source line, the actual PC is printed at the beginning. */ |
| 107 | |
| 108 | void |
| 109 | print_stack_frame (struct frame_info *frame, int print_level, |
| 110 | enum print_what print_what) |
| 111 | { |
| 112 | struct print_stack_frame_args args; |
| 113 | |
| 114 | args.frame = frame; |
| 115 | args.print_level = print_level; |
| 116 | args.print_what = print_what; |
| 117 | /* For mi, alway print location and address. */ |
| 118 | args.print_what = ui_out_is_mi_like_p (uiout) ? LOC_AND_ADDRESS : print_what; |
| 119 | args.print_args = 1; |
| 120 | |
| 121 | catch_errors (print_stack_frame_stub, &args, "", RETURN_MASK_ERROR); |
| 122 | } |
| 123 | |
| 124 | struct print_args_args |
| 125 | { |
| 126 | struct symbol *func; |
| 127 | struct frame_info *frame; |
| 128 | struct ui_file *stream; |
| 129 | }; |
| 130 | |
| 131 | static int print_args_stub (void *args); |
| 132 | |
| 133 | /* Print nameless arguments of frame FRAME on STREAM, where START is |
| 134 | the offset of the first nameless argument, and NUM is the number of |
| 135 | nameless arguments to print. FIRST is nonzero if this is the first |
| 136 | argument (not just the first nameless argument). */ |
| 137 | |
| 138 | static void |
| 139 | print_frame_nameless_args (struct frame_info *frame, long start, int num, |
| 140 | int first, struct ui_file *stream) |
| 141 | { |
| 142 | int i; |
| 143 | CORE_ADDR argsaddr; |
| 144 | long arg_value; |
| 145 | |
| 146 | for (i = 0; i < num; i++) |
| 147 | { |
| 148 | QUIT; |
| 149 | argsaddr = get_frame_args_address (frame); |
| 150 | if (!argsaddr) |
| 151 | return; |
| 152 | arg_value = read_memory_integer (argsaddr + start, sizeof (int)); |
| 153 | if (!first) |
| 154 | fprintf_filtered (stream, ", "); |
| 155 | fprintf_filtered (stream, "%ld", arg_value); |
| 156 | first = 0; |
| 157 | start += sizeof (int); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | /* Print the arguments of frame FRAME on STREAM, given the function |
| 162 | FUNC running in that frame (as a symbol), where NUM is the number |
| 163 | of arguments according to the stack frame (or -1 if the number of |
| 164 | arguments is unknown). */ |
| 165 | |
| 166 | /* Note that currently the "number of arguments according to the |
| 167 | stack frame" is only known on VAX where i refers to the "number of |
| 168 | ints of arguments according to the stack frame". */ |
| 169 | |
| 170 | static void |
| 171 | print_frame_args (struct symbol *func, struct frame_info *frame, |
| 172 | int num, struct ui_file *stream) |
| 173 | { |
| 174 | int first = 1; |
| 175 | /* Offset of next stack argument beyond the one we have seen that is |
| 176 | at the highest offset, or -1 if we haven't come to a stack |
| 177 | argument yet. */ |
| 178 | long highest_offset = -1; |
| 179 | /* Number of ints of arguments that we have printed so far. */ |
| 180 | int args_printed = 0; |
| 181 | struct cleanup *old_chain, *list_chain; |
| 182 | struct ui_stream *stb; |
| 183 | /* True if we should print arguments, false otherwise. */ |
| 184 | int print_args = strcmp (print_frame_arguments, "none"); |
| 185 | /* True in "summary" mode, false otherwise. */ |
| 186 | int summary = !strcmp (print_frame_arguments, "scalars"); |
| 187 | |
| 188 | stb = ui_out_stream_new (uiout); |
| 189 | old_chain = make_cleanup_ui_out_stream_delete (stb); |
| 190 | |
| 191 | if (func) |
| 192 | { |
| 193 | struct block *b = SYMBOL_BLOCK_VALUE (func); |
| 194 | struct dict_iterator iter; |
| 195 | struct symbol *sym; |
| 196 | struct value *val; |
| 197 | |
| 198 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 199 | { |
| 200 | QUIT; |
| 201 | |
| 202 | /* Keep track of the highest stack argument offset seen, and |
| 203 | skip over any kinds of symbols we don't care about. */ |
| 204 | |
| 205 | if (!SYMBOL_IS_ARGUMENT (sym)) |
| 206 | continue; |
| 207 | |
| 208 | switch (SYMBOL_CLASS (sym)) |
| 209 | { |
| 210 | case LOC_ARG: |
| 211 | case LOC_REF_ARG: |
| 212 | { |
| 213 | long current_offset = SYMBOL_VALUE (sym); |
| 214 | int arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym)); |
| 215 | |
| 216 | /* Compute address of next argument by adding the size of |
| 217 | this argument and rounding to an int boundary. */ |
| 218 | current_offset = |
| 219 | ((current_offset + arg_size + sizeof (int) - 1) |
| 220 | & ~(sizeof (int) - 1)); |
| 221 | |
| 222 | /* If this is the highest offset seen yet, set |
| 223 | highest_offset. */ |
| 224 | if (highest_offset == -1 |
| 225 | || (current_offset > highest_offset)) |
| 226 | highest_offset = current_offset; |
| 227 | |
| 228 | /* Add the number of ints we're about to print to |
| 229 | args_printed. */ |
| 230 | args_printed += (arg_size + sizeof (int) - 1) / sizeof (int); |
| 231 | } |
| 232 | |
| 233 | /* We care about types of symbols, but don't need to |
| 234 | keep track of stack offsets in them. */ |
| 235 | case LOC_REGISTER: |
| 236 | case LOC_REGPARM_ADDR: |
| 237 | case LOC_COMPUTED: |
| 238 | case LOC_OPTIMIZED_OUT: |
| 239 | default: |
| 240 | break; |
| 241 | } |
| 242 | |
| 243 | /* We have to look up the symbol because arguments can have |
| 244 | two entries (one a parameter, one a local) and the one we |
| 245 | want is the local, which lookup_symbol will find for us. |
| 246 | This includes gcc1 (not gcc2) on SPARC when passing a |
| 247 | small structure and gcc2 when the argument type is float |
| 248 | and it is passed as a double and converted to float by |
| 249 | the prologue (in the latter case the type of the LOC_ARG |
| 250 | symbol is double and the type of the LOC_LOCAL symbol is |
| 251 | float). */ |
| 252 | /* But if the parameter name is null, don't try it. Null |
| 253 | parameter names occur on the RS/6000, for traceback |
| 254 | tables. FIXME, should we even print them? */ |
| 255 | |
| 256 | if (*SYMBOL_LINKAGE_NAME (sym)) |
| 257 | { |
| 258 | struct symbol *nsym; |
| 259 | nsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), |
| 260 | b, VAR_DOMAIN, NULL); |
| 261 | gdb_assert (nsym != NULL); |
| 262 | if (SYMBOL_CLASS (nsym) == LOC_REGISTER |
| 263 | && !SYMBOL_IS_ARGUMENT (nsym)) |
| 264 | { |
| 265 | /* There is a LOC_ARG/LOC_REGISTER pair. This means |
| 266 | that it was passed on the stack and loaded into a |
| 267 | register, or passed in a register and stored in a |
| 268 | stack slot. GDB 3.x used the LOC_ARG; GDB |
| 269 | 4.0-4.11 used the LOC_REGISTER. |
| 270 | |
| 271 | Reasons for using the LOC_ARG: |
| 272 | |
| 273 | (1) Because find_saved_registers may be slow for |
| 274 | remote debugging. |
| 275 | |
| 276 | (2) Because registers are often re-used and stack |
| 277 | slots rarely (never?) are. Therefore using |
| 278 | the stack slot is much less likely to print |
| 279 | garbage. |
| 280 | |
| 281 | Reasons why we might want to use the LOC_REGISTER: |
| 282 | |
| 283 | (1) So that the backtrace prints the same value |
| 284 | as "print foo". I see no compelling reason |
| 285 | why this needs to be the case; having the |
| 286 | backtrace print the value which was passed |
| 287 | in, and "print foo" print the value as |
| 288 | modified within the called function, makes |
| 289 | perfect sense to me. |
| 290 | |
| 291 | Additional note: It might be nice if "info args" |
| 292 | displayed both values. |
| 293 | |
| 294 | One more note: There is a case with SPARC |
| 295 | structure passing where we need to use the |
| 296 | LOC_REGISTER, but this is dealt with by creating |
| 297 | a single LOC_REGPARM in symbol reading. */ |
| 298 | |
| 299 | /* Leave sym (the LOC_ARG) alone. */ |
| 300 | ; |
| 301 | } |
| 302 | else |
| 303 | sym = nsym; |
| 304 | } |
| 305 | |
| 306 | /* Print the current arg. */ |
| 307 | if (!first) |
| 308 | ui_out_text (uiout, ", "); |
| 309 | ui_out_wrap_hint (uiout, " "); |
| 310 | |
| 311 | annotate_arg_begin (); |
| 312 | |
| 313 | list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); |
| 314 | fprintf_symbol_filtered (stb->stream, SYMBOL_PRINT_NAME (sym), |
| 315 | SYMBOL_LANGUAGE (sym), |
| 316 | DMGL_PARAMS | DMGL_ANSI); |
| 317 | ui_out_field_stream (uiout, "name", stb); |
| 318 | annotate_arg_name_end (); |
| 319 | ui_out_text (uiout, "="); |
| 320 | |
| 321 | if (print_args) |
| 322 | { |
| 323 | /* Avoid value_print because it will deref ref parameters. |
| 324 | We just want to print their addresses. Print ??? for |
| 325 | args whose address we do not know. We pass 2 as |
| 326 | "recurse" to val_print because our standard indentation |
| 327 | here is 4 spaces, and val_print indents 2 for each |
| 328 | recurse. */ |
| 329 | val = read_var_value (sym, frame); |
| 330 | |
| 331 | annotate_arg_value (val == NULL ? NULL : value_type (val)); |
| 332 | |
| 333 | if (val) |
| 334 | { |
| 335 | const struct language_defn *language; |
| 336 | struct value_print_options opts; |
| 337 | |
| 338 | /* Use the appropriate language to display our symbol, |
| 339 | unless the user forced the language to a specific |
| 340 | language. */ |
| 341 | if (language_mode == language_mode_auto) |
| 342 | language = language_def (SYMBOL_LANGUAGE (sym)); |
| 343 | else |
| 344 | language = current_language; |
| 345 | |
| 346 | get_raw_print_options (&opts); |
| 347 | opts.deref_ref = 0; |
| 348 | opts.summary = summary; |
| 349 | common_val_print (val, stb->stream, 2, &opts, language); |
| 350 | ui_out_field_stream (uiout, "value", stb); |
| 351 | } |
| 352 | else |
| 353 | ui_out_text (uiout, "???"); |
| 354 | } |
| 355 | else |
| 356 | ui_out_text (uiout, "..."); |
| 357 | |
| 358 | |
| 359 | /* Invoke ui_out_tuple_end. */ |
| 360 | do_cleanups (list_chain); |
| 361 | |
| 362 | annotate_arg_end (); |
| 363 | |
| 364 | first = 0; |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | /* Don't print nameless args in situations where we don't know |
| 369 | enough about the stack to find them. */ |
| 370 | if (num != -1) |
| 371 | { |
| 372 | long start; |
| 373 | |
| 374 | if (highest_offset == -1) |
| 375 | start = gdbarch_frame_args_skip (get_frame_arch (frame)); |
| 376 | else |
| 377 | start = highest_offset; |
| 378 | |
| 379 | print_frame_nameless_args (frame, start, num - args_printed, |
| 380 | first, stream); |
| 381 | } |
| 382 | |
| 383 | do_cleanups (old_chain); |
| 384 | } |
| 385 | |
| 386 | /* Stub for catch_errors. */ |
| 387 | |
| 388 | static int |
| 389 | print_args_stub (void *args) |
| 390 | { |
| 391 | struct print_args_args *p = args; |
| 392 | struct gdbarch *gdbarch = get_frame_arch (p->frame); |
| 393 | int numargs; |
| 394 | |
| 395 | if (gdbarch_frame_num_args_p (gdbarch)) |
| 396 | { |
| 397 | numargs = gdbarch_frame_num_args (gdbarch, p->frame); |
| 398 | gdb_assert (numargs >= 0); |
| 399 | } |
| 400 | else |
| 401 | numargs = -1; |
| 402 | print_frame_args (p->func, p->frame, numargs, p->stream); |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | /* Set the current source and line to the location given by frame |
| 407 | FRAME, if possible. When CENTER is true, adjust so the relevant |
| 408 | line is in the center of the next 'list'. */ |
| 409 | |
| 410 | void |
| 411 | set_current_sal_from_frame (struct frame_info *frame, int center) |
| 412 | { |
| 413 | struct symtab_and_line sal; |
| 414 | |
| 415 | find_frame_sal (frame, &sal); |
| 416 | if (sal.symtab) |
| 417 | { |
| 418 | if (center) |
| 419 | sal.line = max (sal.line - get_lines_to_list () / 2, 1); |
| 420 | set_current_source_symtab_and_line (&sal); |
| 421 | } |
| 422 | } |
| 423 | |
| 424 | /* If ON, GDB will display disassembly of the next source line when |
| 425 | execution of the program being debugged stops. |
| 426 | If AUTO (which is the default), or there's no line info to determine |
| 427 | the source line of the next instruction, display disassembly of next |
| 428 | instruction instead. */ |
| 429 | |
| 430 | static enum auto_boolean disassemble_next_line; |
| 431 | |
| 432 | static void |
| 433 | show_disassemble_next_line (struct ui_file *file, int from_tty, |
| 434 | struct cmd_list_element *c, |
| 435 | const char *value) |
| 436 | { |
| 437 | fprintf_filtered (file, _("\ |
| 438 | Debugger's willingness to use disassemble-next-line is %s.\n"), |
| 439 | value); |
| 440 | } |
| 441 | |
| 442 | /* Show assembly codes; stub for catch_errors. */ |
| 443 | |
| 444 | struct gdb_disassembly_stub_args |
| 445 | { |
| 446 | int how_many; |
| 447 | CORE_ADDR low; |
| 448 | CORE_ADDR high; |
| 449 | }; |
| 450 | |
| 451 | static void |
| 452 | gdb_disassembly_stub (void *args) |
| 453 | { |
| 454 | struct gdb_disassembly_stub_args *p = args; |
| 455 | gdb_disassembly (uiout, 0, 0, p->how_many, p->low, p->high); |
| 456 | } |
| 457 | |
| 458 | /* Use TRY_CATCH to catch the exception from the gdb_disassembly |
| 459 | because it will be broken by filter sometime. */ |
| 460 | |
| 461 | static void |
| 462 | do_gdb_disassembly (int how_many, CORE_ADDR low, CORE_ADDR high) |
| 463 | { |
| 464 | volatile struct gdb_exception exception; |
| 465 | struct gdb_disassembly_stub_args args; |
| 466 | |
| 467 | args.how_many = how_many; |
| 468 | args.low = low; |
| 469 | args.high = high; |
| 470 | TRY_CATCH (exception, RETURN_MASK_ALL) |
| 471 | { |
| 472 | gdb_disassembly_stub (&args); |
| 473 | } |
| 474 | /* If an exception was thrown while doing the disassembly, print |
| 475 | the error message, to give the user a clue of what happened. */ |
| 476 | if (exception.reason == RETURN_ERROR) |
| 477 | exception_print (gdb_stderr, exception); |
| 478 | } |
| 479 | |
| 480 | /* Print information about frame FRAME. The output is format according |
| 481 | to PRINT_LEVEL and PRINT_WHAT and PRINT ARGS. The meaning of |
| 482 | PRINT_WHAT is: |
| 483 | |
| 484 | SRC_LINE: Print only source line. |
| 485 | LOCATION: Print only location. |
| 486 | LOC_AND_SRC: Print location and source line. |
| 487 | |
| 488 | Used in "where" output, and to emit breakpoint or step |
| 489 | messages. */ |
| 490 | |
| 491 | void |
| 492 | print_frame_info (struct frame_info *frame, int print_level, |
| 493 | enum print_what print_what, int print_args) |
| 494 | { |
| 495 | struct symtab_and_line sal; |
| 496 | int source_print; |
| 497 | int location_print; |
| 498 | |
| 499 | if (get_frame_type (frame) == DUMMY_FRAME |
| 500 | || get_frame_type (frame) == SIGTRAMP_FRAME) |
| 501 | { |
| 502 | struct cleanup *uiout_cleanup |
| 503 | = make_cleanup_ui_out_tuple_begin_end (uiout, "frame"); |
| 504 | |
| 505 | annotate_frame_begin (print_level ? frame_relative_level (frame) : 0, |
| 506 | get_frame_pc (frame)); |
| 507 | |
| 508 | /* Do this regardless of SOURCE because we don't have any source |
| 509 | to list for this frame. */ |
| 510 | if (print_level) |
| 511 | { |
| 512 | ui_out_text (uiout, "#"); |
| 513 | ui_out_field_fmt_int (uiout, 2, ui_left, "level", |
| 514 | frame_relative_level (frame)); |
| 515 | } |
| 516 | if (ui_out_is_mi_like_p (uiout)) |
| 517 | { |
| 518 | annotate_frame_address (); |
| 519 | ui_out_field_core_addr (uiout, "addr", get_frame_pc (frame)); |
| 520 | annotate_frame_address_end (); |
| 521 | } |
| 522 | |
| 523 | if (get_frame_type (frame) == DUMMY_FRAME) |
| 524 | { |
| 525 | annotate_function_call (); |
| 526 | ui_out_field_string (uiout, "func", "<function called from gdb>"); |
| 527 | } |
| 528 | else if (get_frame_type (frame) == SIGTRAMP_FRAME) |
| 529 | { |
| 530 | annotate_signal_handler_caller (); |
| 531 | ui_out_field_string (uiout, "func", "<signal handler called>"); |
| 532 | } |
| 533 | ui_out_text (uiout, "\n"); |
| 534 | annotate_frame_end (); |
| 535 | |
| 536 | do_cleanups (uiout_cleanup); |
| 537 | return; |
| 538 | } |
| 539 | |
| 540 | /* If FRAME is not the innermost frame, that normally means that |
| 541 | FRAME->pc points to *after* the call instruction, and we want to |
| 542 | get the line containing the call, never the next line. But if |
| 543 | the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the |
| 544 | next frame was not entered as the result of a call, and we want |
| 545 | to get the line containing FRAME->pc. */ |
| 546 | find_frame_sal (frame, &sal); |
| 547 | |
| 548 | location_print = (print_what == LOCATION |
| 549 | || print_what == LOC_AND_ADDRESS |
| 550 | || print_what == SRC_AND_LOC); |
| 551 | |
| 552 | if (location_print || !sal.symtab) |
| 553 | print_frame (frame, print_level, print_what, print_args, sal); |
| 554 | |
| 555 | source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC); |
| 556 | |
| 557 | /* If disassemble-next-line is set to auto or on and doesn't have |
| 558 | the line debug messages for $pc, output the next instruction. */ |
| 559 | if ((disassemble_next_line == AUTO_BOOLEAN_AUTO |
| 560 | || disassemble_next_line == AUTO_BOOLEAN_TRUE) |
| 561 | && source_print && !sal.symtab) |
| 562 | do_gdb_disassembly (1, get_frame_pc (frame), get_frame_pc (frame) + 1); |
| 563 | |
| 564 | if (source_print && sal.symtab) |
| 565 | { |
| 566 | int done = 0; |
| 567 | int mid_statement = ((print_what == SRC_LINE) |
| 568 | && (get_frame_pc (frame) != sal.pc)); |
| 569 | |
| 570 | if (annotation_level) |
| 571 | done = identify_source_line (sal.symtab, sal.line, mid_statement, |
| 572 | get_frame_pc (frame)); |
| 573 | if (!done) |
| 574 | { |
| 575 | if (deprecated_print_frame_info_listing_hook) |
| 576 | deprecated_print_frame_info_listing_hook (sal.symtab, |
| 577 | sal.line, |
| 578 | sal.line + 1, 0); |
| 579 | else |
| 580 | { |
| 581 | struct value_print_options opts; |
| 582 | get_user_print_options (&opts); |
| 583 | /* We used to do this earlier, but that is clearly |
| 584 | wrong. This function is used by many different |
| 585 | parts of gdb, including normal_stop in infrun.c, |
| 586 | which uses this to print out the current PC |
| 587 | when we stepi/nexti into the middle of a source |
| 588 | line. Only the command line really wants this |
| 589 | behavior. Other UIs probably would like the |
| 590 | ability to decide for themselves if it is desired. */ |
| 591 | if (opts.addressprint && mid_statement) |
| 592 | { |
| 593 | ui_out_field_core_addr (uiout, "addr", get_frame_pc (frame)); |
| 594 | ui_out_text (uiout, "\t"); |
| 595 | } |
| 596 | |
| 597 | print_source_lines (sal.symtab, sal.line, sal.line + 1, 0); |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | /* If disassemble-next-line is set to on and there is line debug |
| 602 | messages, output assembly codes for next line. */ |
| 603 | if (disassemble_next_line == AUTO_BOOLEAN_TRUE) |
| 604 | do_gdb_disassembly (-1, get_frame_pc (frame), sal.end); |
| 605 | } |
| 606 | |
| 607 | if (print_what != LOCATION) |
| 608 | set_default_breakpoint (1, get_frame_pc (frame), sal.symtab, sal.line); |
| 609 | |
| 610 | annotate_frame_end (); |
| 611 | |
| 612 | gdb_flush (gdb_stdout); |
| 613 | } |
| 614 | |
| 615 | /* Attempt to obtain the FUNNAME and FUNLANG of the function corresponding |
| 616 | to FRAME. */ |
| 617 | void |
| 618 | find_frame_funname (struct frame_info *frame, char **funname, |
| 619 | enum language *funlang) |
| 620 | { |
| 621 | struct symbol *func; |
| 622 | |
| 623 | *funname = NULL; |
| 624 | *funlang = language_unknown; |
| 625 | |
| 626 | func = find_pc_function (get_frame_address_in_block (frame)); |
| 627 | if (func) |
| 628 | { |
| 629 | /* In certain pathological cases, the symtabs give the wrong |
| 630 | function (when we are in the first function in a file which |
| 631 | is compiled without debugging symbols, the previous function |
| 632 | is compiled with debugging symbols, and the "foo.o" symbol |
| 633 | that is supposed to tell us where the file with debugging |
| 634 | symbols ends has been truncated by ar because it is longer |
| 635 | than 15 characters). This also occurs if the user uses asm() |
| 636 | to create a function but not stabs for it (in a file compiled |
| 637 | with -g). |
| 638 | |
| 639 | So look in the minimal symbol tables as well, and if it comes |
| 640 | up with a larger address for the function use that instead. |
| 641 | I don't think this can ever cause any problems; there |
| 642 | shouldn't be any minimal symbols in the middle of a function; |
| 643 | if this is ever changed many parts of GDB will need to be |
| 644 | changed (and we'll create a find_pc_minimal_function or some |
| 645 | such). */ |
| 646 | |
| 647 | struct minimal_symbol *msymbol = |
| 648 | lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame)); |
| 649 | |
| 650 | if (msymbol != NULL |
| 651 | && (SYMBOL_VALUE_ADDRESS (msymbol) |
| 652 | > BLOCK_START (SYMBOL_BLOCK_VALUE (func)))) |
| 653 | { |
| 654 | /* We also don't know anything about the function besides |
| 655 | its address and name. */ |
| 656 | func = 0; |
| 657 | *funname = SYMBOL_PRINT_NAME (msymbol); |
| 658 | *funlang = SYMBOL_LANGUAGE (msymbol); |
| 659 | } |
| 660 | else |
| 661 | { |
| 662 | *funname = SYMBOL_PRINT_NAME (func); |
| 663 | *funlang = SYMBOL_LANGUAGE (func); |
| 664 | if (*funlang == language_cplus) |
| 665 | { |
| 666 | /* It seems appropriate to use SYMBOL_PRINT_NAME() here, |
| 667 | to display the demangled name that we already have |
| 668 | stored in the symbol table, but we stored a version |
| 669 | with DMGL_PARAMS turned on, and here we don't want to |
| 670 | display parameters. So remove the parameters. */ |
| 671 | char *func_only = cp_remove_params (*funname); |
| 672 | if (func_only) |
| 673 | { |
| 674 | *funname = func_only; |
| 675 | make_cleanup (xfree, func_only); |
| 676 | } |
| 677 | } |
| 678 | } |
| 679 | } |
| 680 | else |
| 681 | { |
| 682 | struct minimal_symbol *msymbol = |
| 683 | lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame)); |
| 684 | |
| 685 | if (msymbol != NULL) |
| 686 | { |
| 687 | *funname = SYMBOL_PRINT_NAME (msymbol); |
| 688 | *funlang = SYMBOL_LANGUAGE (msymbol); |
| 689 | } |
| 690 | } |
| 691 | } |
| 692 | |
| 693 | static void |
| 694 | print_frame (struct frame_info *frame, int print_level, |
| 695 | enum print_what print_what, int print_args, |
| 696 | struct symtab_and_line sal) |
| 697 | { |
| 698 | char *funname = NULL; |
| 699 | enum language funlang = language_unknown; |
| 700 | struct ui_stream *stb; |
| 701 | struct cleanup *old_chain, *list_chain; |
| 702 | struct value_print_options opts; |
| 703 | |
| 704 | stb = ui_out_stream_new (uiout); |
| 705 | old_chain = make_cleanup_ui_out_stream_delete (stb); |
| 706 | |
| 707 | find_frame_funname (frame, &funname, &funlang); |
| 708 | |
| 709 | annotate_frame_begin (print_level ? frame_relative_level (frame) : 0, |
| 710 | get_frame_pc (frame)); |
| 711 | |
| 712 | list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame"); |
| 713 | |
| 714 | if (print_level) |
| 715 | { |
| 716 | ui_out_text (uiout, "#"); |
| 717 | ui_out_field_fmt_int (uiout, 2, ui_left, "level", |
| 718 | frame_relative_level (frame)); |
| 719 | } |
| 720 | get_user_print_options (&opts); |
| 721 | if (opts.addressprint) |
| 722 | if (get_frame_pc (frame) != sal.pc || !sal.symtab |
| 723 | || print_what == LOC_AND_ADDRESS) |
| 724 | { |
| 725 | annotate_frame_address (); |
| 726 | ui_out_field_core_addr (uiout, "addr", get_frame_pc (frame)); |
| 727 | annotate_frame_address_end (); |
| 728 | ui_out_text (uiout, " in "); |
| 729 | } |
| 730 | annotate_frame_function_name (); |
| 731 | fprintf_symbol_filtered (stb->stream, funname ? funname : "??", |
| 732 | funlang, DMGL_ANSI); |
| 733 | ui_out_field_stream (uiout, "func", stb); |
| 734 | ui_out_wrap_hint (uiout, " "); |
| 735 | annotate_frame_args (); |
| 736 | |
| 737 | ui_out_text (uiout, " ("); |
| 738 | if (print_args) |
| 739 | { |
| 740 | struct print_args_args args; |
| 741 | struct cleanup *args_list_chain; |
| 742 | args.frame = frame; |
| 743 | args.func = find_pc_function (get_frame_address_in_block (frame)); |
| 744 | args.stream = gdb_stdout; |
| 745 | args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args"); |
| 746 | catch_errors (print_args_stub, &args, "", RETURN_MASK_ERROR); |
| 747 | /* FIXME: ARGS must be a list. If one argument is a string it |
| 748 | will have " that will not be properly escaped. */ |
| 749 | /* Invoke ui_out_tuple_end. */ |
| 750 | do_cleanups (args_list_chain); |
| 751 | QUIT; |
| 752 | } |
| 753 | ui_out_text (uiout, ")"); |
| 754 | if (sal.symtab && sal.symtab->filename) |
| 755 | { |
| 756 | annotate_frame_source_begin (); |
| 757 | ui_out_wrap_hint (uiout, " "); |
| 758 | ui_out_text (uiout, " at "); |
| 759 | annotate_frame_source_file (); |
| 760 | ui_out_field_string (uiout, "file", sal.symtab->filename); |
| 761 | if (ui_out_is_mi_like_p (uiout)) |
| 762 | { |
| 763 | const char *fullname = symtab_to_fullname (sal.symtab); |
| 764 | if (fullname != NULL) |
| 765 | ui_out_field_string (uiout, "fullname", fullname); |
| 766 | } |
| 767 | annotate_frame_source_file_end (); |
| 768 | ui_out_text (uiout, ":"); |
| 769 | annotate_frame_source_line (); |
| 770 | ui_out_field_int (uiout, "line", sal.line); |
| 771 | annotate_frame_source_end (); |
| 772 | } |
| 773 | |
| 774 | if (!funname || (!sal.symtab || !sal.symtab->filename)) |
| 775 | { |
| 776 | #ifdef PC_SOLIB |
| 777 | char *lib = PC_SOLIB (get_frame_pc (frame)); |
| 778 | #else |
| 779 | char *lib = solib_name_from_address (get_frame_pc (frame)); |
| 780 | #endif |
| 781 | if (lib) |
| 782 | { |
| 783 | annotate_frame_where (); |
| 784 | ui_out_wrap_hint (uiout, " "); |
| 785 | ui_out_text (uiout, " from "); |
| 786 | ui_out_field_string (uiout, "from", lib); |
| 787 | } |
| 788 | } |
| 789 | |
| 790 | /* do_cleanups will call ui_out_tuple_end() for us. */ |
| 791 | do_cleanups (list_chain); |
| 792 | ui_out_text (uiout, "\n"); |
| 793 | do_cleanups (old_chain); |
| 794 | } |
| 795 | \f |
| 796 | |
| 797 | /* Read a frame specification in whatever the appropriate format is |
| 798 | from FRAME_EXP. Call error(), printing MESSAGE, if the |
| 799 | specification is in any way invalid (so this function never returns |
| 800 | NULL). When SEPECTED_P is non-NULL set its target to indicate that |
| 801 | the default selected frame was used. */ |
| 802 | |
| 803 | static struct frame_info * |
| 804 | parse_frame_specification_1 (const char *frame_exp, const char *message, |
| 805 | int *selected_frame_p) |
| 806 | { |
| 807 | int numargs; |
| 808 | struct value *args[4]; |
| 809 | CORE_ADDR addrs[ARRAY_SIZE (args)]; |
| 810 | |
| 811 | if (frame_exp == NULL) |
| 812 | numargs = 0; |
| 813 | else |
| 814 | { |
| 815 | char *addr_string; |
| 816 | struct cleanup *tmp_cleanup; |
| 817 | |
| 818 | numargs = 0; |
| 819 | while (1) |
| 820 | { |
| 821 | char *addr_string; |
| 822 | struct cleanup *cleanup; |
| 823 | const char *p; |
| 824 | |
| 825 | /* Skip leading white space, bail of EOL. */ |
| 826 | while (isspace (*frame_exp)) |
| 827 | frame_exp++; |
| 828 | if (!*frame_exp) |
| 829 | break; |
| 830 | |
| 831 | /* Parse the argument, extract it, save it. */ |
| 832 | for (p = frame_exp; |
| 833 | *p && !isspace (*p); |
| 834 | p++); |
| 835 | addr_string = savestring (frame_exp, p - frame_exp); |
| 836 | frame_exp = p; |
| 837 | cleanup = make_cleanup (xfree, addr_string); |
| 838 | |
| 839 | /* NOTE: Parse and evaluate expression, but do not use |
| 840 | functions such as parse_and_eval_long or |
| 841 | parse_and_eval_address to also extract the value. |
| 842 | Instead value_as_long and value_as_address are used. |
| 843 | This avoids problems with expressions that contain |
| 844 | side-effects. */ |
| 845 | if (numargs >= ARRAY_SIZE (args)) |
| 846 | error (_("Too many args in frame specification")); |
| 847 | args[numargs++] = parse_and_eval (addr_string); |
| 848 | |
| 849 | do_cleanups (cleanup); |
| 850 | } |
| 851 | } |
| 852 | |
| 853 | /* If no args, default to the selected frame. */ |
| 854 | if (numargs == 0) |
| 855 | { |
| 856 | if (selected_frame_p != NULL) |
| 857 | (*selected_frame_p) = 1; |
| 858 | return get_selected_frame (message); |
| 859 | } |
| 860 | |
| 861 | /* None of the remaining use the selected frame. */ |
| 862 | if (selected_frame_p != NULL) |
| 863 | (*selected_frame_p) = 0; |
| 864 | |
| 865 | /* Assume the single arg[0] is an integer, and try using that to |
| 866 | select a frame relative to current. */ |
| 867 | if (numargs == 1) |
| 868 | { |
| 869 | struct frame_info *fid; |
| 870 | int level = value_as_long (args[0]); |
| 871 | fid = find_relative_frame (get_current_frame (), &level); |
| 872 | if (level == 0) |
| 873 | /* find_relative_frame was successful */ |
| 874 | return fid; |
| 875 | } |
| 876 | |
| 877 | /* Convert each value into a corresponding address. */ |
| 878 | { |
| 879 | int i; |
| 880 | for (i = 0; i < numargs; i++) |
| 881 | addrs[i] = value_as_address (args[i]); |
| 882 | } |
| 883 | |
| 884 | /* Assume that the single arg[0] is an address, use that to identify |
| 885 | a frame with a matching ID. Should this also accept stack/pc or |
| 886 | stack/pc/special. */ |
| 887 | if (numargs == 1) |
| 888 | { |
| 889 | struct frame_id id = frame_id_build_wild (addrs[0]); |
| 890 | struct frame_info *fid; |
| 891 | |
| 892 | /* If (s)he specifies the frame with an address, he deserves |
| 893 | what (s)he gets. Still, give the highest one that matches. |
| 894 | (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't |
| 895 | know). */ |
| 896 | for (fid = get_current_frame (); |
| 897 | fid != NULL; |
| 898 | fid = get_prev_frame (fid)) |
| 899 | { |
| 900 | if (frame_id_eq (id, get_frame_id (fid))) |
| 901 | { |
| 902 | while (frame_id_eq (id, frame_unwind_id (fid))) |
| 903 | fid = get_prev_frame (fid); |
| 904 | return fid; |
| 905 | } |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | /* We couldn't identify the frame as an existing frame, but |
| 910 | perhaps we can create one with a single argument. */ |
| 911 | if (numargs == 1) |
| 912 | return create_new_frame (addrs[0], 0); |
| 913 | else if (numargs == 2) |
| 914 | return create_new_frame (addrs[0], addrs[1]); |
| 915 | else |
| 916 | error (_("Too many args in frame specification")); |
| 917 | } |
| 918 | |
| 919 | static struct frame_info * |
| 920 | parse_frame_specification (char *frame_exp) |
| 921 | { |
| 922 | return parse_frame_specification_1 (frame_exp, NULL, NULL); |
| 923 | } |
| 924 | |
| 925 | /* Print verbosely the selected frame or the frame at address |
| 926 | ADDR_EXP. Absolutely all information in the frame is printed. */ |
| 927 | |
| 928 | static void |
| 929 | frame_info (char *addr_exp, int from_tty) |
| 930 | { |
| 931 | struct frame_info *fi; |
| 932 | struct symtab_and_line sal; |
| 933 | struct symbol *func; |
| 934 | struct symtab *s; |
| 935 | struct frame_info *calling_frame_info; |
| 936 | int i, count, numregs; |
| 937 | char *funname = 0; |
| 938 | enum language funlang = language_unknown; |
| 939 | const char *pc_regname; |
| 940 | int selected_frame_p; |
| 941 | struct gdbarch *gdbarch; |
| 942 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
| 943 | |
| 944 | fi = parse_frame_specification_1 (addr_exp, "No stack.", &selected_frame_p); |
| 945 | gdbarch = get_frame_arch (fi); |
| 946 | |
| 947 | /* Name of the value returned by get_frame_pc(). Per comments, "pc" |
| 948 | is not a good name. */ |
| 949 | if (gdbarch_pc_regnum (gdbarch) >= 0) |
| 950 | /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can |
| 951 | easily not match that of the internal value returned by |
| 952 | get_frame_pc(). */ |
| 953 | pc_regname = gdbarch_register_name (gdbarch, gdbarch_pc_regnum (gdbarch)); |
| 954 | else |
| 955 | /* But then, this is weird to. Even without gdbarch_pc_regnum, an |
| 956 | architectures will often have a hardware register called "pc", |
| 957 | and that register's value, again, can easily not match |
| 958 | get_frame_pc(). */ |
| 959 | pc_regname = "pc"; |
| 960 | |
| 961 | find_frame_sal (fi, &sal); |
| 962 | func = get_frame_function (fi); |
| 963 | /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain |
| 964 | the same value? */ |
| 965 | s = find_pc_symtab (get_frame_pc (fi)); |
| 966 | if (func) |
| 967 | { |
| 968 | funname = SYMBOL_PRINT_NAME (func); |
| 969 | funlang = SYMBOL_LANGUAGE (func); |
| 970 | if (funlang == language_cplus) |
| 971 | { |
| 972 | /* It seems appropriate to use SYMBOL_PRINT_NAME() here, |
| 973 | to display the demangled name that we already have |
| 974 | stored in the symbol table, but we stored a version |
| 975 | with DMGL_PARAMS turned on, and here we don't want to |
| 976 | display parameters. So remove the parameters. */ |
| 977 | char *func_only = cp_remove_params (funname); |
| 978 | if (func_only) |
| 979 | { |
| 980 | funname = func_only; |
| 981 | make_cleanup (xfree, func_only); |
| 982 | } |
| 983 | } |
| 984 | } |
| 985 | else |
| 986 | { |
| 987 | struct minimal_symbol *msymbol; |
| 988 | |
| 989 | msymbol = lookup_minimal_symbol_by_pc (get_frame_pc (fi)); |
| 990 | if (msymbol != NULL) |
| 991 | { |
| 992 | funname = SYMBOL_PRINT_NAME (msymbol); |
| 993 | funlang = SYMBOL_LANGUAGE (msymbol); |
| 994 | } |
| 995 | } |
| 996 | calling_frame_info = get_prev_frame (fi); |
| 997 | |
| 998 | if (selected_frame_p && frame_relative_level (fi) >= 0) |
| 999 | { |
| 1000 | printf_filtered (_("Stack level %d, frame at "), |
| 1001 | frame_relative_level (fi)); |
| 1002 | } |
| 1003 | else |
| 1004 | { |
| 1005 | printf_filtered (_("Stack frame at ")); |
| 1006 | } |
| 1007 | fputs_filtered (paddress (get_frame_base (fi)), gdb_stdout); |
| 1008 | printf_filtered (":\n"); |
| 1009 | printf_filtered (" %s = ", pc_regname); |
| 1010 | fputs_filtered (paddress (get_frame_pc (fi)), gdb_stdout); |
| 1011 | |
| 1012 | wrap_here (" "); |
| 1013 | if (funname) |
| 1014 | { |
| 1015 | printf_filtered (" in "); |
| 1016 | fprintf_symbol_filtered (gdb_stdout, funname, funlang, |
| 1017 | DMGL_ANSI | DMGL_PARAMS); |
| 1018 | } |
| 1019 | wrap_here (" "); |
| 1020 | if (sal.symtab) |
| 1021 | printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line); |
| 1022 | puts_filtered ("; "); |
| 1023 | wrap_here (" "); |
| 1024 | printf_filtered ("saved %s ", pc_regname); |
| 1025 | fputs_filtered (paddress (frame_pc_unwind (fi)), gdb_stdout); |
| 1026 | printf_filtered ("\n"); |
| 1027 | |
| 1028 | if (calling_frame_info == NULL) |
| 1029 | { |
| 1030 | enum unwind_stop_reason reason; |
| 1031 | |
| 1032 | reason = get_frame_unwind_stop_reason (fi); |
| 1033 | if (reason != UNWIND_NO_REASON) |
| 1034 | printf_filtered (_(" Outermost frame: %s\n"), |
| 1035 | frame_stop_reason_string (reason)); |
| 1036 | } |
| 1037 | |
| 1038 | if (calling_frame_info) |
| 1039 | { |
| 1040 | printf_filtered (" called by frame at "); |
| 1041 | fputs_filtered (paddress (get_frame_base (calling_frame_info)), |
| 1042 | gdb_stdout); |
| 1043 | } |
| 1044 | if (get_next_frame (fi) && calling_frame_info) |
| 1045 | puts_filtered (","); |
| 1046 | wrap_here (" "); |
| 1047 | if (get_next_frame (fi)) |
| 1048 | { |
| 1049 | printf_filtered (" caller of frame at "); |
| 1050 | fputs_filtered (paddress (get_frame_base (get_next_frame (fi))), |
| 1051 | gdb_stdout); |
| 1052 | } |
| 1053 | if (get_next_frame (fi) || calling_frame_info) |
| 1054 | puts_filtered ("\n"); |
| 1055 | |
| 1056 | if (s) |
| 1057 | printf_filtered (" source language %s.\n", |
| 1058 | language_str (s->language)); |
| 1059 | |
| 1060 | { |
| 1061 | /* Address of the argument list for this frame, or 0. */ |
| 1062 | CORE_ADDR arg_list = get_frame_args_address (fi); |
| 1063 | /* Number of args for this frame, or -1 if unknown. */ |
| 1064 | int numargs; |
| 1065 | |
| 1066 | if (arg_list == 0) |
| 1067 | printf_filtered (" Arglist at unknown address.\n"); |
| 1068 | else |
| 1069 | { |
| 1070 | printf_filtered (" Arglist at "); |
| 1071 | fputs_filtered (paddress (arg_list), gdb_stdout); |
| 1072 | printf_filtered (","); |
| 1073 | |
| 1074 | if (!gdbarch_frame_num_args_p (gdbarch)) |
| 1075 | { |
| 1076 | numargs = -1; |
| 1077 | puts_filtered (" args: "); |
| 1078 | } |
| 1079 | else |
| 1080 | { |
| 1081 | numargs = gdbarch_frame_num_args (gdbarch, fi); |
| 1082 | gdb_assert (numargs >= 0); |
| 1083 | if (numargs == 0) |
| 1084 | puts_filtered (" no args."); |
| 1085 | else if (numargs == 1) |
| 1086 | puts_filtered (" 1 arg: "); |
| 1087 | else |
| 1088 | printf_filtered (" %d args: ", numargs); |
| 1089 | } |
| 1090 | print_frame_args (func, fi, numargs, gdb_stdout); |
| 1091 | puts_filtered ("\n"); |
| 1092 | } |
| 1093 | } |
| 1094 | { |
| 1095 | /* Address of the local variables for this frame, or 0. */ |
| 1096 | CORE_ADDR arg_list = get_frame_locals_address (fi); |
| 1097 | |
| 1098 | if (arg_list == 0) |
| 1099 | printf_filtered (" Locals at unknown address,"); |
| 1100 | else |
| 1101 | { |
| 1102 | printf_filtered (" Locals at "); |
| 1103 | fputs_filtered (paddress (arg_list), gdb_stdout); |
| 1104 | printf_filtered (","); |
| 1105 | } |
| 1106 | } |
| 1107 | |
| 1108 | /* Print as much information as possible on the location of all the |
| 1109 | registers. */ |
| 1110 | { |
| 1111 | enum lval_type lval; |
| 1112 | int optimized; |
| 1113 | CORE_ADDR addr; |
| 1114 | int realnum; |
| 1115 | int count; |
| 1116 | int i; |
| 1117 | int need_nl = 1; |
| 1118 | |
| 1119 | /* The sp is special; what's displayed isn't the save address, but |
| 1120 | the value of the previous frame's sp. This is a legacy thing, |
| 1121 | at one stage the frame cached the previous frame's SP instead |
| 1122 | of its address, hence it was easiest to just display the cached |
| 1123 | value. */ |
| 1124 | if (gdbarch_sp_regnum (gdbarch) >= 0) |
| 1125 | { |
| 1126 | /* Find out the location of the saved stack pointer with out |
| 1127 | actually evaluating it. */ |
| 1128 | frame_register_unwind (fi, gdbarch_sp_regnum (gdbarch), |
| 1129 | &optimized, &lval, &addr, |
| 1130 | &realnum, NULL); |
| 1131 | if (!optimized && lval == not_lval) |
| 1132 | { |
| 1133 | gdb_byte value[MAX_REGISTER_SIZE]; |
| 1134 | CORE_ADDR sp; |
| 1135 | frame_register_unwind (fi, gdbarch_sp_regnum (gdbarch), |
| 1136 | &optimized, &lval, &addr, |
| 1137 | &realnum, value); |
| 1138 | /* NOTE: cagney/2003-05-22: This is assuming that the |
| 1139 | stack pointer was packed as an unsigned integer. That |
| 1140 | may or may not be valid. */ |
| 1141 | sp = extract_unsigned_integer (value, |
| 1142 | register_size (gdbarch, |
| 1143 | gdbarch_sp_regnum (gdbarch))); |
| 1144 | printf_filtered (" Previous frame's sp is "); |
| 1145 | fputs_filtered (paddress (sp), gdb_stdout); |
| 1146 | printf_filtered ("\n"); |
| 1147 | need_nl = 0; |
| 1148 | } |
| 1149 | else if (!optimized && lval == lval_memory) |
| 1150 | { |
| 1151 | printf_filtered (" Previous frame's sp at "); |
| 1152 | fputs_filtered (paddress (addr), gdb_stdout); |
| 1153 | printf_filtered ("\n"); |
| 1154 | need_nl = 0; |
| 1155 | } |
| 1156 | else if (!optimized && lval == lval_register) |
| 1157 | { |
| 1158 | printf_filtered (" Previous frame's sp in %s\n", |
| 1159 | gdbarch_register_name (gdbarch, realnum)); |
| 1160 | need_nl = 0; |
| 1161 | } |
| 1162 | /* else keep quiet. */ |
| 1163 | } |
| 1164 | |
| 1165 | count = 0; |
| 1166 | numregs = gdbarch_num_regs (gdbarch) |
| 1167 | + gdbarch_num_pseudo_regs (gdbarch); |
| 1168 | for (i = 0; i < numregs; i++) |
| 1169 | if (i != gdbarch_sp_regnum (gdbarch) |
| 1170 | && gdbarch_register_reggroup_p (gdbarch, i, all_reggroup)) |
| 1171 | { |
| 1172 | /* Find out the location of the saved register without |
| 1173 | fetching the corresponding value. */ |
| 1174 | frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum, |
| 1175 | NULL); |
| 1176 | /* For moment, only display registers that were saved on the |
| 1177 | stack. */ |
| 1178 | if (!optimized && lval == lval_memory) |
| 1179 | { |
| 1180 | if (count == 0) |
| 1181 | puts_filtered (" Saved registers:\n "); |
| 1182 | else |
| 1183 | puts_filtered (","); |
| 1184 | wrap_here (" "); |
| 1185 | printf_filtered (" %s at ", |
| 1186 | gdbarch_register_name (gdbarch, i)); |
| 1187 | fputs_filtered (paddress (addr), gdb_stdout); |
| 1188 | count++; |
| 1189 | } |
| 1190 | } |
| 1191 | if (count || need_nl) |
| 1192 | puts_filtered ("\n"); |
| 1193 | } |
| 1194 | |
| 1195 | do_cleanups (back_to); |
| 1196 | } |
| 1197 | |
| 1198 | /* Print briefly all stack frames or just the innermost COUNT_EXP |
| 1199 | frames. */ |
| 1200 | |
| 1201 | static void |
| 1202 | backtrace_command_1 (char *count_exp, int show_locals, int from_tty) |
| 1203 | { |
| 1204 | struct frame_info *fi; |
| 1205 | int count; |
| 1206 | int i; |
| 1207 | struct frame_info *trailing; |
| 1208 | int trailing_level; |
| 1209 | |
| 1210 | if (!target_has_stack) |
| 1211 | error (_("No stack.")); |
| 1212 | |
| 1213 | /* The following code must do two things. First, it must set the |
| 1214 | variable TRAILING to the frame from which we should start |
| 1215 | printing. Second, it must set the variable count to the number |
| 1216 | of frames which we should print, or -1 if all of them. */ |
| 1217 | trailing = get_current_frame (); |
| 1218 | |
| 1219 | /* The target can be in a state where there is no valid frames |
| 1220 | (e.g., just connected). */ |
| 1221 | if (trailing == NULL) |
| 1222 | error (_("No stack.")); |
| 1223 | |
| 1224 | trailing_level = 0; |
| 1225 | if (count_exp) |
| 1226 | { |
| 1227 | count = parse_and_eval_long (count_exp); |
| 1228 | if (count < 0) |
| 1229 | { |
| 1230 | struct frame_info *current; |
| 1231 | |
| 1232 | count = -count; |
| 1233 | |
| 1234 | current = trailing; |
| 1235 | while (current && count--) |
| 1236 | { |
| 1237 | QUIT; |
| 1238 | current = get_prev_frame (current); |
| 1239 | } |
| 1240 | |
| 1241 | /* Will stop when CURRENT reaches the top of the stack. |
| 1242 | TRAILING will be COUNT below it. */ |
| 1243 | while (current) |
| 1244 | { |
| 1245 | QUIT; |
| 1246 | trailing = get_prev_frame (trailing); |
| 1247 | current = get_prev_frame (current); |
| 1248 | trailing_level++; |
| 1249 | } |
| 1250 | |
| 1251 | count = -1; |
| 1252 | } |
| 1253 | } |
| 1254 | else |
| 1255 | count = -1; |
| 1256 | |
| 1257 | if (info_verbose) |
| 1258 | { |
| 1259 | struct partial_symtab *ps; |
| 1260 | |
| 1261 | /* Read in symbols for all of the frames. Need to do this in a |
| 1262 | separate pass so that "Reading in symbols for xxx" messages |
| 1263 | don't screw up the appearance of the backtrace. Also if |
| 1264 | people have strong opinions against reading symbols for |
| 1265 | backtrace this may have to be an option. */ |
| 1266 | i = count; |
| 1267 | for (fi = trailing; fi != NULL && i--; fi = get_prev_frame (fi)) |
| 1268 | { |
| 1269 | QUIT; |
| 1270 | ps = find_pc_psymtab (get_frame_address_in_block (fi)); |
| 1271 | if (ps) |
| 1272 | PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in. */ |
| 1273 | } |
| 1274 | } |
| 1275 | |
| 1276 | for (i = 0, fi = trailing; fi && count--; i++, fi = get_prev_frame (fi)) |
| 1277 | { |
| 1278 | QUIT; |
| 1279 | |
| 1280 | /* Don't use print_stack_frame; if an error() occurs it probably |
| 1281 | means further attempts to backtrace would fail (on the other |
| 1282 | hand, perhaps the code does or could be fixed to make sure |
| 1283 | the frame->prev field gets set to NULL in that case). */ |
| 1284 | print_frame_info (fi, 1, LOCATION, 1); |
| 1285 | if (show_locals) |
| 1286 | print_frame_local_vars (fi, 1, gdb_stdout); |
| 1287 | |
| 1288 | /* Save the last frame to check for error conditions. */ |
| 1289 | trailing = fi; |
| 1290 | } |
| 1291 | |
| 1292 | /* If we've stopped before the end, mention that. */ |
| 1293 | if (fi && from_tty) |
| 1294 | printf_filtered (_("(More stack frames follow...)\n")); |
| 1295 | |
| 1296 | /* If we've run out of frames, and the reason appears to be an error |
| 1297 | condition, print it. */ |
| 1298 | if (fi == NULL && trailing != NULL) |
| 1299 | { |
| 1300 | enum unwind_stop_reason reason; |
| 1301 | |
| 1302 | reason = get_frame_unwind_stop_reason (trailing); |
| 1303 | if (reason > UNWIND_FIRST_ERROR) |
| 1304 | printf_filtered (_("Backtrace stopped: %s\n"), |
| 1305 | frame_stop_reason_string (reason)); |
| 1306 | } |
| 1307 | } |
| 1308 | |
| 1309 | struct backtrace_command_args |
| 1310 | { |
| 1311 | char *count_exp; |
| 1312 | int show_locals; |
| 1313 | int from_tty; |
| 1314 | }; |
| 1315 | |
| 1316 | /* Stub for catch_errors. */ |
| 1317 | |
| 1318 | static int |
| 1319 | backtrace_command_stub (void *data) |
| 1320 | { |
| 1321 | struct backtrace_command_args *args = data; |
| 1322 | backtrace_command_1 (args->count_exp, args->show_locals, args->from_tty); |
| 1323 | return 0; |
| 1324 | } |
| 1325 | |
| 1326 | static void |
| 1327 | backtrace_command (char *arg, int from_tty) |
| 1328 | { |
| 1329 | struct cleanup *old_chain = NULL; |
| 1330 | int fulltrace_arg = -1, arglen = 0, argc = 0; |
| 1331 | struct backtrace_command_args btargs; |
| 1332 | |
| 1333 | if (arg) |
| 1334 | { |
| 1335 | char **argv; |
| 1336 | int i; |
| 1337 | |
| 1338 | argv = gdb_buildargv (arg); |
| 1339 | old_chain = make_cleanup_freeargv (argv); |
| 1340 | argc = 0; |
| 1341 | for (i = 0; argv[i]; i++) |
| 1342 | { |
| 1343 | unsigned int j; |
| 1344 | |
| 1345 | for (j = 0; j < strlen (argv[i]); j++) |
| 1346 | argv[i][j] = tolower (argv[i][j]); |
| 1347 | |
| 1348 | if (fulltrace_arg < 0 && subset_compare (argv[i], "full")) |
| 1349 | fulltrace_arg = argc; |
| 1350 | else |
| 1351 | { |
| 1352 | arglen += strlen (argv[i]); |
| 1353 | argc++; |
| 1354 | } |
| 1355 | } |
| 1356 | arglen += argc; |
| 1357 | if (fulltrace_arg >= 0) |
| 1358 | { |
| 1359 | if (arglen > 0) |
| 1360 | { |
| 1361 | arg = xmalloc (arglen + 1); |
| 1362 | memset (arg, 0, arglen + 1); |
| 1363 | for (i = 0; i < (argc + 1); i++) |
| 1364 | { |
| 1365 | if (i != fulltrace_arg) |
| 1366 | { |
| 1367 | strcat (arg, argv[i]); |
| 1368 | strcat (arg, " "); |
| 1369 | } |
| 1370 | } |
| 1371 | } |
| 1372 | else |
| 1373 | arg = NULL; |
| 1374 | } |
| 1375 | } |
| 1376 | |
| 1377 | btargs.count_exp = arg; |
| 1378 | btargs.show_locals = (fulltrace_arg >= 0); |
| 1379 | btargs.from_tty = from_tty; |
| 1380 | catch_errors (backtrace_command_stub, &btargs, "", RETURN_MASK_ERROR); |
| 1381 | |
| 1382 | if (fulltrace_arg >= 0 && arglen > 0) |
| 1383 | xfree (arg); |
| 1384 | |
| 1385 | if (old_chain) |
| 1386 | do_cleanups (old_chain); |
| 1387 | } |
| 1388 | |
| 1389 | static void |
| 1390 | backtrace_full_command (char *arg, int from_tty) |
| 1391 | { |
| 1392 | struct backtrace_command_args btargs; |
| 1393 | btargs.count_exp = arg; |
| 1394 | btargs.show_locals = 1; |
| 1395 | btargs.from_tty = from_tty; |
| 1396 | catch_errors (backtrace_command_stub, &btargs, "", RETURN_MASK_ERROR); |
| 1397 | } |
| 1398 | \f |
| 1399 | |
| 1400 | /* Print the local variables of a block B active in FRAME on STREAM. |
| 1401 | Return 1 if any variables were printed; 0 otherwise. */ |
| 1402 | |
| 1403 | static int |
| 1404 | print_block_frame_locals (struct block *b, struct frame_info *frame, |
| 1405 | int num_tabs, struct ui_file *stream) |
| 1406 | { |
| 1407 | struct dict_iterator iter; |
| 1408 | struct symbol *sym; |
| 1409 | int values_printed = 0; |
| 1410 | int j; |
| 1411 | |
| 1412 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 1413 | { |
| 1414 | switch (SYMBOL_CLASS (sym)) |
| 1415 | { |
| 1416 | case LOC_LOCAL: |
| 1417 | case LOC_REGISTER: |
| 1418 | case LOC_STATIC: |
| 1419 | case LOC_COMPUTED: |
| 1420 | if (SYMBOL_IS_ARGUMENT (sym)) |
| 1421 | break; |
| 1422 | values_printed = 1; |
| 1423 | print_variable_and_value (NULL, sym, frame, stream, 4 * num_tabs); |
| 1424 | break; |
| 1425 | |
| 1426 | default: |
| 1427 | /* Ignore symbols which are not locals. */ |
| 1428 | break; |
| 1429 | } |
| 1430 | } |
| 1431 | |
| 1432 | return values_printed; |
| 1433 | } |
| 1434 | |
| 1435 | /* Same, but print labels. */ |
| 1436 | |
| 1437 | static int |
| 1438 | print_block_frame_labels (struct block *b, int *have_default, |
| 1439 | struct ui_file *stream) |
| 1440 | { |
| 1441 | struct dict_iterator iter; |
| 1442 | struct symbol *sym; |
| 1443 | int values_printed = 0; |
| 1444 | |
| 1445 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 1446 | { |
| 1447 | if (strcmp (SYMBOL_LINKAGE_NAME (sym), "default") == 0) |
| 1448 | { |
| 1449 | if (*have_default) |
| 1450 | continue; |
| 1451 | *have_default = 1; |
| 1452 | } |
| 1453 | if (SYMBOL_CLASS (sym) == LOC_LABEL) |
| 1454 | { |
| 1455 | struct symtab_and_line sal; |
| 1456 | struct value_print_options opts; |
| 1457 | sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0); |
| 1458 | values_printed = 1; |
| 1459 | fputs_filtered (SYMBOL_PRINT_NAME (sym), stream); |
| 1460 | get_user_print_options (&opts); |
| 1461 | if (opts.addressprint) |
| 1462 | { |
| 1463 | fprintf_filtered (stream, " "); |
| 1464 | fputs_filtered (paddress (SYMBOL_VALUE_ADDRESS (sym)), stream); |
| 1465 | } |
| 1466 | fprintf_filtered (stream, " in file %s, line %d\n", |
| 1467 | sal.symtab->filename, sal.line); |
| 1468 | } |
| 1469 | } |
| 1470 | |
| 1471 | return values_printed; |
| 1472 | } |
| 1473 | |
| 1474 | /* Print on STREAM all the local variables in frame FRAME, including |
| 1475 | all the blocks active in that frame at its current PC. |
| 1476 | |
| 1477 | Returns 1 if the job was done, or 0 if nothing was printed because |
| 1478 | we have no info on the function running in FRAME. */ |
| 1479 | |
| 1480 | static void |
| 1481 | print_frame_local_vars (struct frame_info *frame, int num_tabs, |
| 1482 | struct ui_file *stream) |
| 1483 | { |
| 1484 | struct block *block = get_frame_block (frame, 0); |
| 1485 | int values_printed = 0; |
| 1486 | |
| 1487 | if (block == 0) |
| 1488 | { |
| 1489 | fprintf_filtered (stream, "No symbol table info available.\n"); |
| 1490 | return; |
| 1491 | } |
| 1492 | |
| 1493 | while (block) |
| 1494 | { |
| 1495 | if (print_block_frame_locals (block, frame, num_tabs, stream)) |
| 1496 | values_printed = 1; |
| 1497 | /* After handling the function's top-level block, stop. Don't |
| 1498 | continue to its superblock, the block of per-file symbols. */ |
| 1499 | if (BLOCK_FUNCTION (block)) |
| 1500 | break; |
| 1501 | block = BLOCK_SUPERBLOCK (block); |
| 1502 | } |
| 1503 | |
| 1504 | if (!values_printed) |
| 1505 | fprintf_filtered (stream, _("No locals.\n")); |
| 1506 | } |
| 1507 | |
| 1508 | /* Same, but print labels. */ |
| 1509 | |
| 1510 | static void |
| 1511 | print_frame_label_vars (struct frame_info *frame, int this_level_only, |
| 1512 | struct ui_file *stream) |
| 1513 | { |
| 1514 | #if 1 |
| 1515 | fprintf_filtered (stream, "print_frame_label_vars disabled.\n"); |
| 1516 | #else |
| 1517 | struct blockvector *bl; |
| 1518 | struct block *block = get_frame_block (frame, 0); |
| 1519 | int values_printed = 0; |
| 1520 | int index, have_default = 0; |
| 1521 | char *blocks_printed; |
| 1522 | CORE_ADDR pc = get_frame_pc (frame); |
| 1523 | |
| 1524 | if (block == 0) |
| 1525 | { |
| 1526 | fprintf_filtered (stream, "No symbol table info available.\n"); |
| 1527 | return; |
| 1528 | } |
| 1529 | |
| 1530 | bl = blockvector_for_pc (BLOCK_END (block) - 4, &index); |
| 1531 | blocks_printed = alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char)); |
| 1532 | memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char)); |
| 1533 | |
| 1534 | while (block != 0) |
| 1535 | { |
| 1536 | CORE_ADDR end = BLOCK_END (block) - 4; |
| 1537 | int last_index; |
| 1538 | |
| 1539 | if (bl != blockvector_for_pc (end, &index)) |
| 1540 | error (_("blockvector blotch")); |
| 1541 | if (BLOCKVECTOR_BLOCK (bl, index) != block) |
| 1542 | error (_("blockvector botch")); |
| 1543 | last_index = BLOCKVECTOR_NBLOCKS (bl); |
| 1544 | index += 1; |
| 1545 | |
| 1546 | /* Don't print out blocks that have gone by. */ |
| 1547 | while (index < last_index |
| 1548 | && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc) |
| 1549 | index++; |
| 1550 | |
| 1551 | while (index < last_index |
| 1552 | && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end) |
| 1553 | { |
| 1554 | if (blocks_printed[index] == 0) |
| 1555 | { |
| 1556 | if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), |
| 1557 | &have_default, stream)) |
| 1558 | values_printed = 1; |
| 1559 | blocks_printed[index] = 1; |
| 1560 | } |
| 1561 | index++; |
| 1562 | } |
| 1563 | if (have_default) |
| 1564 | return; |
| 1565 | if (values_printed && this_level_only) |
| 1566 | return; |
| 1567 | |
| 1568 | /* After handling the function's top-level block, stop. Don't |
| 1569 | continue to its superblock, the block of per-file symbols. */ |
| 1570 | if (BLOCK_FUNCTION (block)) |
| 1571 | break; |
| 1572 | block = BLOCK_SUPERBLOCK (block); |
| 1573 | } |
| 1574 | |
| 1575 | if (!values_printed && !this_level_only) |
| 1576 | fprintf_filtered (stream, _("No catches.\n")); |
| 1577 | #endif |
| 1578 | } |
| 1579 | |
| 1580 | void |
| 1581 | locals_info (char *args, int from_tty) |
| 1582 | { |
| 1583 | print_frame_local_vars (get_selected_frame (_("No frame selected.")), |
| 1584 | 0, gdb_stdout); |
| 1585 | } |
| 1586 | |
| 1587 | static void |
| 1588 | catch_info (char *ignore, int from_tty) |
| 1589 | { |
| 1590 | struct symtab_and_line *sal; |
| 1591 | |
| 1592 | /* Assume g++ compiled code; old GDB 4.16 behaviour. */ |
| 1593 | print_frame_label_vars (get_selected_frame (_("No frame selected.")), |
| 1594 | 0, gdb_stdout); |
| 1595 | } |
| 1596 | |
| 1597 | static void |
| 1598 | print_frame_arg_vars (struct frame_info *frame, struct ui_file *stream) |
| 1599 | { |
| 1600 | struct symbol *func = get_frame_function (frame); |
| 1601 | struct block *b; |
| 1602 | struct dict_iterator iter; |
| 1603 | struct symbol *sym, *sym2; |
| 1604 | int values_printed = 0; |
| 1605 | |
| 1606 | if (func == 0) |
| 1607 | { |
| 1608 | fprintf_filtered (stream, _("No symbol table info available.\n")); |
| 1609 | return; |
| 1610 | } |
| 1611 | |
| 1612 | b = SYMBOL_BLOCK_VALUE (func); |
| 1613 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 1614 | { |
| 1615 | /* Don't worry about things which aren't arguments. */ |
| 1616 | if (SYMBOL_IS_ARGUMENT (sym)) |
| 1617 | { |
| 1618 | values_printed = 1; |
| 1619 | |
| 1620 | /* We have to look up the symbol because arguments can have |
| 1621 | two entries (one a parameter, one a local) and the one we |
| 1622 | want is the local, which lookup_symbol will find for us. |
| 1623 | This includes gcc1 (not gcc2) on the sparc when passing a |
| 1624 | small structure and gcc2 when the argument type is float |
| 1625 | and it is passed as a double and converted to float by |
| 1626 | the prologue (in the latter case the type of the LOC_ARG |
| 1627 | symbol is double and the type of the LOC_LOCAL symbol is |
| 1628 | float). There are also LOC_ARG/LOC_REGISTER pairs which |
| 1629 | are not combined in symbol-reading. */ |
| 1630 | |
| 1631 | sym2 = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), |
| 1632 | b, VAR_DOMAIN, NULL); |
| 1633 | print_variable_and_value (SYMBOL_PRINT_NAME (sym), sym2, |
| 1634 | frame, stream, 0); |
| 1635 | } |
| 1636 | } |
| 1637 | |
| 1638 | if (!values_printed) |
| 1639 | fprintf_filtered (stream, _("No arguments.\n")); |
| 1640 | } |
| 1641 | |
| 1642 | void |
| 1643 | args_info (char *ignore, int from_tty) |
| 1644 | { |
| 1645 | print_frame_arg_vars (get_selected_frame (_("No frame selected.")), |
| 1646 | gdb_stdout); |
| 1647 | } |
| 1648 | |
| 1649 | |
| 1650 | static void |
| 1651 | args_plus_locals_info (char *ignore, int from_tty) |
| 1652 | { |
| 1653 | args_info (ignore, from_tty); |
| 1654 | locals_info (ignore, from_tty); |
| 1655 | } |
| 1656 | \f |
| 1657 | |
| 1658 | /* Select frame FRAME. Also print the stack frame and show the source |
| 1659 | if this is the tui version. */ |
| 1660 | static void |
| 1661 | select_and_print_frame (struct frame_info *frame) |
| 1662 | { |
| 1663 | select_frame (frame); |
| 1664 | if (frame) |
| 1665 | print_stack_frame (frame, 1, SRC_AND_LOC); |
| 1666 | } |
| 1667 | \f |
| 1668 | /* Return the symbol-block in which the selected frame is executing. |
| 1669 | Can return zero under various legitimate circumstances. |
| 1670 | |
| 1671 | If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant |
| 1672 | code address within the block returned. We use this to decide |
| 1673 | which macros are in scope. */ |
| 1674 | |
| 1675 | struct block * |
| 1676 | get_selected_block (CORE_ADDR *addr_in_block) |
| 1677 | { |
| 1678 | if (!has_stack_frames ()) |
| 1679 | return 0; |
| 1680 | |
| 1681 | return get_frame_block (get_selected_frame (NULL), addr_in_block); |
| 1682 | } |
| 1683 | |
| 1684 | /* Find a frame a certain number of levels away from FRAME. |
| 1685 | LEVEL_OFFSET_PTR points to an int containing the number of levels. |
| 1686 | Positive means go to earlier frames (up); negative, the reverse. |
| 1687 | The int that contains the number of levels is counted toward |
| 1688 | zero as the frames for those levels are found. |
| 1689 | If the top or bottom frame is reached, that frame is returned, |
| 1690 | but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates |
| 1691 | how much farther the original request asked to go. */ |
| 1692 | |
| 1693 | struct frame_info * |
| 1694 | find_relative_frame (struct frame_info *frame, int *level_offset_ptr) |
| 1695 | { |
| 1696 | /* Going up is simple: just call get_prev_frame enough times or |
| 1697 | until the initial frame is reached. */ |
| 1698 | while (*level_offset_ptr > 0) |
| 1699 | { |
| 1700 | struct frame_info *prev = get_prev_frame (frame); |
| 1701 | if (!prev) |
| 1702 | break; |
| 1703 | (*level_offset_ptr)--; |
| 1704 | frame = prev; |
| 1705 | } |
| 1706 | |
| 1707 | /* Going down is just as simple. */ |
| 1708 | while (*level_offset_ptr < 0) |
| 1709 | { |
| 1710 | struct frame_info *next = get_next_frame (frame); |
| 1711 | if (!next) |
| 1712 | break; |
| 1713 | (*level_offset_ptr)++; |
| 1714 | frame = next; |
| 1715 | } |
| 1716 | |
| 1717 | return frame; |
| 1718 | } |
| 1719 | |
| 1720 | /* The "select_frame" command. With no argument this is a NOP. |
| 1721 | Select the frame at level LEVEL_EXP if it is a valid level. |
| 1722 | Otherwise, treat LEVEL_EXP as an address expression and select it. |
| 1723 | |
| 1724 | See parse_frame_specification for more info on proper frame |
| 1725 | expressions. */ |
| 1726 | |
| 1727 | void |
| 1728 | select_frame_command (char *level_exp, int from_tty) |
| 1729 | { |
| 1730 | select_frame (parse_frame_specification_1 (level_exp, "No stack.", NULL)); |
| 1731 | } |
| 1732 | |
| 1733 | /* The "frame" command. With no argument, print the selected frame |
| 1734 | briefly. With an argument, behave like select_frame and then print |
| 1735 | the selected frame. */ |
| 1736 | |
| 1737 | static void |
| 1738 | frame_command (char *level_exp, int from_tty) |
| 1739 | { |
| 1740 | select_frame_command (level_exp, from_tty); |
| 1741 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| 1742 | } |
| 1743 | |
| 1744 | /* The XDB Compatibility command to print the current frame. */ |
| 1745 | |
| 1746 | static void |
| 1747 | current_frame_command (char *level_exp, int from_tty) |
| 1748 | { |
| 1749 | print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC); |
| 1750 | } |
| 1751 | |
| 1752 | /* Select the frame up one or COUNT_EXP stack levels from the |
| 1753 | previously selected frame, and print it briefly. */ |
| 1754 | |
| 1755 | static void |
| 1756 | up_silently_base (char *count_exp) |
| 1757 | { |
| 1758 | struct frame_info *frame; |
| 1759 | int count = 1; |
| 1760 | |
| 1761 | if (count_exp) |
| 1762 | count = parse_and_eval_long (count_exp); |
| 1763 | |
| 1764 | frame = find_relative_frame (get_selected_frame ("No stack."), &count); |
| 1765 | if (count != 0 && count_exp == NULL) |
| 1766 | error (_("Initial frame selected; you cannot go up.")); |
| 1767 | select_frame (frame); |
| 1768 | } |
| 1769 | |
| 1770 | static void |
| 1771 | up_silently_command (char *count_exp, int from_tty) |
| 1772 | { |
| 1773 | up_silently_base (count_exp); |
| 1774 | } |
| 1775 | |
| 1776 | static void |
| 1777 | up_command (char *count_exp, int from_tty) |
| 1778 | { |
| 1779 | up_silently_base (count_exp); |
| 1780 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| 1781 | } |
| 1782 | |
| 1783 | /* Select the frame down one or COUNT_EXP stack levels from the previously |
| 1784 | selected frame, and print it briefly. */ |
| 1785 | |
| 1786 | static void |
| 1787 | down_silently_base (char *count_exp) |
| 1788 | { |
| 1789 | struct frame_info *frame; |
| 1790 | int count = -1; |
| 1791 | if (count_exp) |
| 1792 | count = -parse_and_eval_long (count_exp); |
| 1793 | |
| 1794 | frame = find_relative_frame (get_selected_frame ("No stack."), &count); |
| 1795 | if (count != 0 && count_exp == NULL) |
| 1796 | { |
| 1797 | /* We only do this if COUNT_EXP is not specified. That way |
| 1798 | "down" means to really go down (and let me know if that is |
| 1799 | impossible), but "down 9999" can be used to mean go all the |
| 1800 | way down without getting an error. */ |
| 1801 | |
| 1802 | error (_("Bottom (innermost) frame selected; you cannot go down.")); |
| 1803 | } |
| 1804 | |
| 1805 | select_frame (frame); |
| 1806 | } |
| 1807 | |
| 1808 | static void |
| 1809 | down_silently_command (char *count_exp, int from_tty) |
| 1810 | { |
| 1811 | down_silently_base (count_exp); |
| 1812 | } |
| 1813 | |
| 1814 | static void |
| 1815 | down_command (char *count_exp, int from_tty) |
| 1816 | { |
| 1817 | down_silently_base (count_exp); |
| 1818 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| 1819 | } |
| 1820 | \f |
| 1821 | |
| 1822 | void |
| 1823 | return_command (char *retval_exp, int from_tty) |
| 1824 | { |
| 1825 | struct frame_info *thisframe; |
| 1826 | struct gdbarch *gdbarch; |
| 1827 | struct symbol *thisfun; |
| 1828 | struct value *return_value = NULL; |
| 1829 | const char *query_prefix = ""; |
| 1830 | |
| 1831 | thisframe = get_selected_frame ("No selected frame."); |
| 1832 | thisfun = get_frame_function (thisframe); |
| 1833 | gdbarch = get_frame_arch (thisframe); |
| 1834 | |
| 1835 | /* Compute the return value. If the computation triggers an error, |
| 1836 | let it bail. If the return type can't be handled, set |
| 1837 | RETURN_VALUE to NULL, and QUERY_PREFIX to an informational |
| 1838 | message. */ |
| 1839 | if (retval_exp) |
| 1840 | { |
| 1841 | struct expression *retval_expr = parse_expression (retval_exp); |
| 1842 | struct cleanup *old_chain = make_cleanup (xfree, retval_expr); |
| 1843 | struct type *return_type = NULL; |
| 1844 | |
| 1845 | /* Compute the return value. Should the computation fail, this |
| 1846 | call throws an error. */ |
| 1847 | return_value = evaluate_expression (retval_expr); |
| 1848 | |
| 1849 | /* Cast return value to the return type of the function. Should |
| 1850 | the cast fail, this call throws an error. */ |
| 1851 | if (thisfun != NULL) |
| 1852 | return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun)); |
| 1853 | if (return_type == NULL) |
| 1854 | { |
| 1855 | if (retval_expr->elts[0].opcode != UNOP_CAST) |
| 1856 | error (_("Return value type not available for selected " |
| 1857 | "stack frame.\n" |
| 1858 | "Please use an explicit cast of the value to return.")); |
| 1859 | return_type = value_type (return_value); |
| 1860 | } |
| 1861 | do_cleanups (old_chain); |
| 1862 | CHECK_TYPEDEF (return_type); |
| 1863 | return_value = value_cast (return_type, return_value); |
| 1864 | |
| 1865 | /* Make sure the value is fully evaluated. It may live in the |
| 1866 | stack frame we're about to pop. */ |
| 1867 | if (value_lazy (return_value)) |
| 1868 | value_fetch_lazy (return_value); |
| 1869 | |
| 1870 | if (TYPE_CODE (return_type) == TYPE_CODE_VOID) |
| 1871 | /* If the return-type is "void", don't try to find the |
| 1872 | return-value's location. However, do still evaluate the |
| 1873 | return expression so that, even when the expression result |
| 1874 | is discarded, side effects such as "return i++" still |
| 1875 | occur. */ |
| 1876 | return_value = NULL; |
| 1877 | else if (thisfun != NULL |
| 1878 | && using_struct_return (gdbarch, |
| 1879 | SYMBOL_TYPE (thisfun), return_type)) |
| 1880 | { |
| 1881 | query_prefix = "\ |
| 1882 | The location at which to store the function's return value is unknown.\n\ |
| 1883 | If you continue, the return value that you specified will be ignored.\n"; |
| 1884 | return_value = NULL; |
| 1885 | } |
| 1886 | } |
| 1887 | |
| 1888 | /* Does an interactive user really want to do this? Include |
| 1889 | information, such as how well GDB can handle the return value, in |
| 1890 | the query message. */ |
| 1891 | if (from_tty) |
| 1892 | { |
| 1893 | int confirmed; |
| 1894 | if (thisfun == NULL) |
| 1895 | confirmed = query (_("%sMake selected stack frame return now? "), |
| 1896 | query_prefix); |
| 1897 | else |
| 1898 | confirmed = query (_("%sMake %s return now? "), query_prefix, |
| 1899 | SYMBOL_PRINT_NAME (thisfun)); |
| 1900 | if (!confirmed) |
| 1901 | error (_("Not confirmed")); |
| 1902 | } |
| 1903 | |
| 1904 | /* Discard the selected frame and all frames inner-to it. */ |
| 1905 | frame_pop (get_selected_frame (NULL)); |
| 1906 | |
| 1907 | /* Store RETURN_VALUE in the just-returned register set. */ |
| 1908 | if (return_value != NULL) |
| 1909 | { |
| 1910 | struct type *return_type = value_type (return_value); |
| 1911 | struct gdbarch *gdbarch = get_regcache_arch (get_current_regcache ()); |
| 1912 | struct type *func_type = thisfun == NULL ? NULL : SYMBOL_TYPE (thisfun); |
| 1913 | |
| 1914 | gdb_assert (gdbarch_return_value (gdbarch, func_type, return_type, NULL, |
| 1915 | NULL, NULL) |
| 1916 | == RETURN_VALUE_REGISTER_CONVENTION); |
| 1917 | gdbarch_return_value (gdbarch, func_type, return_type, |
| 1918 | get_current_regcache (), NULL /*read*/, |
| 1919 | value_contents (return_value) /*write*/); |
| 1920 | } |
| 1921 | |
| 1922 | /* If we are at the end of a call dummy now, pop the dummy frame |
| 1923 | too. */ |
| 1924 | if (get_frame_type (get_current_frame ()) == DUMMY_FRAME) |
| 1925 | frame_pop (get_current_frame ()); |
| 1926 | |
| 1927 | /* If interactive, print the frame that is now current. */ |
| 1928 | if (from_tty) |
| 1929 | frame_command ("0", 1); |
| 1930 | else |
| 1931 | select_frame_command ("0", 0); |
| 1932 | } |
| 1933 | |
| 1934 | /* Sets the scope to input function name, provided that the function |
| 1935 | is within the current stack frame */ |
| 1936 | |
| 1937 | struct function_bounds |
| 1938 | { |
| 1939 | CORE_ADDR low, high; |
| 1940 | }; |
| 1941 | |
| 1942 | static void |
| 1943 | func_command (char *arg, int from_tty) |
| 1944 | { |
| 1945 | struct frame_info *frame; |
| 1946 | int found = 0; |
| 1947 | struct symtabs_and_lines sals; |
| 1948 | int i; |
| 1949 | int level = 1; |
| 1950 | struct function_bounds *func_bounds = NULL; |
| 1951 | |
| 1952 | if (arg != NULL) |
| 1953 | return; |
| 1954 | |
| 1955 | frame = parse_frame_specification ("0"); |
| 1956 | sals = decode_line_spec (arg, 1); |
| 1957 | func_bounds = (struct function_bounds *) xmalloc ( |
| 1958 | sizeof (struct function_bounds) * sals.nelts); |
| 1959 | for (i = 0; (i < sals.nelts && !found); i++) |
| 1960 | { |
| 1961 | if (sals.sals[i].pc == 0 |
| 1962 | || find_pc_partial_function (sals.sals[i].pc, NULL, |
| 1963 | &func_bounds[i].low, |
| 1964 | &func_bounds[i].high) == 0) |
| 1965 | { |
| 1966 | func_bounds[i].low = func_bounds[i].high = 0; |
| 1967 | } |
| 1968 | } |
| 1969 | |
| 1970 | do |
| 1971 | { |
| 1972 | for (i = 0; (i < sals.nelts && !found); i++) |
| 1973 | found = (get_frame_pc (frame) >= func_bounds[i].low |
| 1974 | && get_frame_pc (frame) < func_bounds[i].high); |
| 1975 | if (!found) |
| 1976 | { |
| 1977 | level = 1; |
| 1978 | frame = find_relative_frame (frame, &level); |
| 1979 | } |
| 1980 | } |
| 1981 | while (!found && level == 0); |
| 1982 | |
| 1983 | if (func_bounds) |
| 1984 | xfree (func_bounds); |
| 1985 | |
| 1986 | if (!found) |
| 1987 | printf_filtered (_("'%s' not within current stack frame.\n"), arg); |
| 1988 | else if (frame != get_selected_frame (NULL)) |
| 1989 | select_and_print_frame (frame); |
| 1990 | } |
| 1991 | |
| 1992 | /* Gets the language of the current frame. */ |
| 1993 | |
| 1994 | enum language |
| 1995 | get_frame_language (void) |
| 1996 | { |
| 1997 | struct frame_info *frame = deprecated_safe_get_selected_frame (); |
| 1998 | |
| 1999 | if (frame) |
| 2000 | { |
| 2001 | /* We determine the current frame language by looking up its |
| 2002 | associated symtab. To retrieve this symtab, we use the frame |
| 2003 | PC. However we cannot use the frame PC as is, because it |
| 2004 | usually points to the instruction following the "call", which |
| 2005 | is sometimes the first instruction of another function. So |
| 2006 | we rely on get_frame_address_in_block(), it provides us with |
| 2007 | a PC that is guaranteed to be inside the frame's code |
| 2008 | block. */ |
| 2009 | CORE_ADDR pc = get_frame_address_in_block (frame); |
| 2010 | struct symtab *s = find_pc_symtab (pc); |
| 2011 | |
| 2012 | if (s) |
| 2013 | return s->language; |
| 2014 | } |
| 2015 | |
| 2016 | return language_unknown; |
| 2017 | } |
| 2018 | \f |
| 2019 | |
| 2020 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 2021 | void _initialize_stack (void); |
| 2022 | |
| 2023 | void |
| 2024 | _initialize_stack (void) |
| 2025 | { |
| 2026 | #if 0 |
| 2027 | backtrace_limit = 30; |
| 2028 | #endif |
| 2029 | |
| 2030 | add_com ("return", class_stack, return_command, _("\ |
| 2031 | Make selected stack frame return to its caller.\n\ |
| 2032 | Control remains in the debugger, but when you continue\n\ |
| 2033 | execution will resume in the frame above the one now selected.\n\ |
| 2034 | If an argument is given, it is an expression for the value to return.")); |
| 2035 | |
| 2036 | add_com ("up", class_stack, up_command, _("\ |
| 2037 | Select and print stack frame that called this one.\n\ |
| 2038 | An argument says how many frames up to go.")); |
| 2039 | add_com ("up-silently", class_support, up_silently_command, _("\ |
| 2040 | Same as the `up' command, but does not print anything.\n\ |
| 2041 | This is useful in command scripts.")); |
| 2042 | |
| 2043 | add_com ("down", class_stack, down_command, _("\ |
| 2044 | Select and print stack frame called by this one.\n\ |
| 2045 | An argument says how many frames down to go.")); |
| 2046 | add_com_alias ("do", "down", class_stack, 1); |
| 2047 | add_com_alias ("dow", "down", class_stack, 1); |
| 2048 | add_com ("down-silently", class_support, down_silently_command, _("\ |
| 2049 | Same as the `down' command, but does not print anything.\n\ |
| 2050 | This is useful in command scripts.")); |
| 2051 | |
| 2052 | add_com ("frame", class_stack, frame_command, _("\ |
| 2053 | Select and print a stack frame.\n\ |
| 2054 | With no argument, print the selected stack frame. (See also \"info frame\").\n\ |
| 2055 | An argument specifies the frame to select.\n\ |
| 2056 | It can be a stack frame number or the address of the frame.\n\ |
| 2057 | With argument, nothing is printed if input is coming from\n\ |
| 2058 | a command file or a user-defined command.")); |
| 2059 | |
| 2060 | add_com_alias ("f", "frame", class_stack, 1); |
| 2061 | |
| 2062 | if (xdb_commands) |
| 2063 | { |
| 2064 | add_com ("L", class_stack, current_frame_command, |
| 2065 | _("Print the current stack frame.\n")); |
| 2066 | add_com_alias ("V", "frame", class_stack, 1); |
| 2067 | } |
| 2068 | add_com ("select-frame", class_stack, select_frame_command, _("\ |
| 2069 | Select a stack frame without printing anything.\n\ |
| 2070 | An argument specifies the frame to select.\n\ |
| 2071 | It can be a stack frame number or the address of the frame.\n")); |
| 2072 | |
| 2073 | add_com ("backtrace", class_stack, backtrace_command, _("\ |
| 2074 | Print backtrace of all stack frames, or innermost COUNT frames.\n\ |
| 2075 | With a negative argument, print outermost -COUNT frames.\n\ |
| 2076 | Use of the 'full' qualifier also prints the values of the local variables.\n")); |
| 2077 | add_com_alias ("bt", "backtrace", class_stack, 0); |
| 2078 | if (xdb_commands) |
| 2079 | { |
| 2080 | add_com_alias ("t", "backtrace", class_stack, 0); |
| 2081 | add_com ("T", class_stack, backtrace_full_command, _("\ |
| 2082 | Print backtrace of all stack frames, or innermost COUNT frames \n\ |
| 2083 | and the values of the local variables.\n\ |
| 2084 | With a negative argument, print outermost -COUNT frames.\n\ |
| 2085 | Usage: T <count>\n")); |
| 2086 | } |
| 2087 | |
| 2088 | add_com_alias ("where", "backtrace", class_alias, 0); |
| 2089 | add_info ("stack", backtrace_command, |
| 2090 | _("Backtrace of the stack, or innermost COUNT frames.")); |
| 2091 | add_info_alias ("s", "stack", 1); |
| 2092 | add_info ("frame", frame_info, |
| 2093 | _("All about selected stack frame, or frame at ADDR.")); |
| 2094 | add_info_alias ("f", "frame", 1); |
| 2095 | add_info ("locals", locals_info, |
| 2096 | _("Local variables of current stack frame.")); |
| 2097 | add_info ("args", args_info, |
| 2098 | _("Argument variables of current stack frame.")); |
| 2099 | if (xdb_commands) |
| 2100 | add_com ("l", class_info, args_plus_locals_info, |
| 2101 | _("Argument and local variables of current stack frame.")); |
| 2102 | |
| 2103 | if (dbx_commands) |
| 2104 | add_com ("func", class_stack, func_command, _("\ |
| 2105 | Select the stack frame that contains <func>.\n\ |
| 2106 | Usage: func <name>\n")); |
| 2107 | |
| 2108 | add_info ("catch", catch_info, |
| 2109 | _("Exceptions that can be caught in the current stack frame.")); |
| 2110 | |
| 2111 | add_setshow_enum_cmd ("frame-arguments", class_stack, |
| 2112 | print_frame_arguments_choices, &print_frame_arguments, |
| 2113 | _("Set printing of non-scalar frame arguments"), |
| 2114 | _("Show printing of non-scalar frame arguments"), |
| 2115 | NULL, NULL, NULL, &setprintlist, &showprintlist); |
| 2116 | |
| 2117 | add_setshow_auto_boolean_cmd ("disassemble-next-line", class_stack, |
| 2118 | &disassemble_next_line, _("\ |
| 2119 | Set whether to disassemble next source line or insn when execution stops."), _("\ |
| 2120 | Show whether to disassemble next source line or insn when execution stops."), _("\ |
| 2121 | If ON, GDB will display disassembly of the next source line, in addition\n\ |
| 2122 | to displaying the source line itself. If the next source line cannot\n\ |
| 2123 | be displayed (e.g., source is unavailable or there's no line info), GDB\n\ |
| 2124 | will display disassembly of next instruction instead of showing the\n\ |
| 2125 | source line.\n\ |
| 2126 | If AUTO, display disassembly of next instruction only if the source line\n\ |
| 2127 | cannot be displayed.\n\ |
| 2128 | If OFF (which is the default), never display the disassembly of the next\n\ |
| 2129 | source line."), |
| 2130 | NULL, |
| 2131 | show_disassemble_next_line, |
| 2132 | &setlist, &showlist); |
| 2133 | disassemble_next_line = AUTO_BOOLEAN_FALSE; |
| 2134 | |
| 2135 | #if 0 |
| 2136 | add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command, _(\ |
| 2137 | "Specify maximum number of frames for \"backtrace\" to print by default."), |
| 2138 | &setlist); |
| 2139 | add_info ("backtrace-limit", backtrace_limit_info, _("\ |
| 2140 | The maximum number of frames for \"backtrace\" to print by default.")); |
| 2141 | #endif |
| 2142 | } |