| 1 | /* Print and select stack frames for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-2017 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 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 "source.h" |
| 31 | #include "breakpoint.h" |
| 32 | #include "demangle.h" |
| 33 | #include "inferior.h" |
| 34 | #include "annotate.h" |
| 35 | #include "ui-out.h" |
| 36 | #include "block.h" |
| 37 | #include "stack.h" |
| 38 | #include "dictionary.h" |
| 39 | #include "reggroups.h" |
| 40 | #include "regcache.h" |
| 41 | #include "solib.h" |
| 42 | #include "valprint.h" |
| 43 | #include "gdbthread.h" |
| 44 | #include "cp-support.h" |
| 45 | #include "disasm.h" |
| 46 | #include "inline-frame.h" |
| 47 | #include "linespec.h" |
| 48 | #include "cli/cli-utils.h" |
| 49 | #include "objfiles.h" |
| 50 | |
| 51 | #include "safe-ctype.h" |
| 52 | #include "symfile.h" |
| 53 | #include "extension.h" |
| 54 | #include "observer.h" |
| 55 | #include "common/def-vector.h" |
| 56 | |
| 57 | /* The possible choices of "set print frame-arguments", and the value |
| 58 | of this setting. */ |
| 59 | |
| 60 | static const char *const print_frame_arguments_choices[] = |
| 61 | {"all", "scalars", "none", NULL}; |
| 62 | static const char *print_frame_arguments = "scalars"; |
| 63 | |
| 64 | /* If non-zero, don't invoke pretty-printers for frame arguments. */ |
| 65 | static int print_raw_frame_arguments; |
| 66 | |
| 67 | /* The possible choices of "set print entry-values", and the value |
| 68 | of this setting. */ |
| 69 | |
| 70 | const char print_entry_values_no[] = "no"; |
| 71 | const char print_entry_values_only[] = "only"; |
| 72 | const char print_entry_values_preferred[] = "preferred"; |
| 73 | const char print_entry_values_if_needed[] = "if-needed"; |
| 74 | const char print_entry_values_both[] = "both"; |
| 75 | const char print_entry_values_compact[] = "compact"; |
| 76 | const char print_entry_values_default[] = "default"; |
| 77 | static const char *const print_entry_values_choices[] = |
| 78 | { |
| 79 | print_entry_values_no, |
| 80 | print_entry_values_only, |
| 81 | print_entry_values_preferred, |
| 82 | print_entry_values_if_needed, |
| 83 | print_entry_values_both, |
| 84 | print_entry_values_compact, |
| 85 | print_entry_values_default, |
| 86 | NULL |
| 87 | }; |
| 88 | const char *print_entry_values = print_entry_values_default; |
| 89 | |
| 90 | /* Prototypes for local functions. */ |
| 91 | |
| 92 | static void print_frame_local_vars (struct frame_info *, int, |
| 93 | struct ui_file *); |
| 94 | |
| 95 | static void print_frame (struct frame_info *frame, int print_level, |
| 96 | enum print_what print_what, int print_args, |
| 97 | struct symtab_and_line sal); |
| 98 | |
| 99 | static void set_last_displayed_sal (int valid, |
| 100 | struct program_space *pspace, |
| 101 | CORE_ADDR addr, |
| 102 | struct symtab *symtab, |
| 103 | int line); |
| 104 | |
| 105 | /* Zero means do things normally; we are interacting directly with the |
| 106 | user. One means print the full filename and linenumber when a |
| 107 | frame is printed, and do so in a format emacs18/emacs19.22 can |
| 108 | parse. Two means print similar annotations, but in many more |
| 109 | cases and in a slightly different syntax. */ |
| 110 | |
| 111 | int annotation_level = 0; |
| 112 | |
| 113 | /* These variables hold the last symtab and line we displayed to the user. |
| 114 | * This is where we insert a breakpoint or a skiplist entry by default. */ |
| 115 | static int last_displayed_sal_valid = 0; |
| 116 | static struct program_space *last_displayed_pspace = 0; |
| 117 | static CORE_ADDR last_displayed_addr = 0; |
| 118 | static struct symtab *last_displayed_symtab = 0; |
| 119 | static int last_displayed_line = 0; |
| 120 | \f |
| 121 | |
| 122 | /* Return 1 if we should display the address in addition to the location, |
| 123 | because we are in the middle of a statement. */ |
| 124 | |
| 125 | static int |
| 126 | frame_show_address (struct frame_info *frame, |
| 127 | struct symtab_and_line sal) |
| 128 | { |
| 129 | /* If there is a line number, but no PC, then there is no location |
| 130 | information associated with this sal. The only way that should |
| 131 | happen is for the call sites of inlined functions (SAL comes from |
| 132 | find_frame_sal). Otherwise, we would have some PC range if the |
| 133 | SAL came from a line table. */ |
| 134 | if (sal.line != 0 && sal.pc == 0 && sal.end == 0) |
| 135 | { |
| 136 | if (get_next_frame (frame) == NULL) |
| 137 | gdb_assert (inline_skipped_frames (inferior_ptid) > 0); |
| 138 | else |
| 139 | gdb_assert (get_frame_type (get_next_frame (frame)) == INLINE_FRAME); |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | return get_frame_pc (frame) != sal.pc; |
| 144 | } |
| 145 | |
| 146 | /* See frame.h. */ |
| 147 | |
| 148 | void |
| 149 | print_stack_frame_to_uiout (struct ui_out *uiout, struct frame_info *frame, |
| 150 | int print_level, enum print_what print_what, |
| 151 | int set_current_sal) |
| 152 | { |
| 153 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); |
| 154 | |
| 155 | print_stack_frame (frame, print_level, print_what, set_current_sal); |
| 156 | } |
| 157 | |
| 158 | /* Show or print a stack frame FRAME briefly. The output is formatted |
| 159 | according to PRINT_LEVEL and PRINT_WHAT printing the frame's |
| 160 | relative level, function name, argument list, and file name and |
| 161 | line number. If the frame's PC is not at the beginning of the |
| 162 | source line, the actual PC is printed at the beginning. */ |
| 163 | |
| 164 | void |
| 165 | print_stack_frame (struct frame_info *frame, int print_level, |
| 166 | enum print_what print_what, |
| 167 | int set_current_sal) |
| 168 | { |
| 169 | |
| 170 | /* For mi, alway print location and address. */ |
| 171 | if (current_uiout->is_mi_like_p ()) |
| 172 | print_what = LOC_AND_ADDRESS; |
| 173 | |
| 174 | TRY |
| 175 | { |
| 176 | print_frame_info (frame, print_level, print_what, 1 /* print_args */, |
| 177 | set_current_sal); |
| 178 | if (set_current_sal) |
| 179 | set_current_sal_from_frame (frame); |
| 180 | } |
| 181 | CATCH (e, RETURN_MASK_ERROR) |
| 182 | { |
| 183 | } |
| 184 | END_CATCH |
| 185 | } |
| 186 | |
| 187 | /* Print nameless arguments of frame FRAME on STREAM, where START is |
| 188 | the offset of the first nameless argument, and NUM is the number of |
| 189 | nameless arguments to print. FIRST is nonzero if this is the first |
| 190 | argument (not just the first nameless argument). */ |
| 191 | |
| 192 | static void |
| 193 | print_frame_nameless_args (struct frame_info *frame, long start, int num, |
| 194 | int first, struct ui_file *stream) |
| 195 | { |
| 196 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 197 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 198 | int i; |
| 199 | CORE_ADDR argsaddr; |
| 200 | long arg_value; |
| 201 | |
| 202 | for (i = 0; i < num; i++) |
| 203 | { |
| 204 | QUIT; |
| 205 | argsaddr = get_frame_args_address (frame); |
| 206 | if (!argsaddr) |
| 207 | return; |
| 208 | arg_value = read_memory_integer (argsaddr + start, |
| 209 | sizeof (int), byte_order); |
| 210 | if (!first) |
| 211 | fprintf_filtered (stream, ", "); |
| 212 | fprintf_filtered (stream, "%ld", arg_value); |
| 213 | first = 0; |
| 214 | start += sizeof (int); |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | /* Print single argument of inferior function. ARG must be already |
| 219 | read in. |
| 220 | |
| 221 | Errors are printed as if they would be the parameter value. Use zeroed ARG |
| 222 | iff it should not be printed accoring to user settings. */ |
| 223 | |
| 224 | static void |
| 225 | print_frame_arg (const struct frame_arg *arg) |
| 226 | { |
| 227 | struct ui_out *uiout = current_uiout; |
| 228 | const char *error_message = NULL; |
| 229 | |
| 230 | string_file stb; |
| 231 | |
| 232 | gdb_assert (!arg->val || !arg->error); |
| 233 | gdb_assert (arg->entry_kind == print_entry_values_no |
| 234 | || arg->entry_kind == print_entry_values_only |
| 235 | || (!uiout->is_mi_like_p () |
| 236 | && arg->entry_kind == print_entry_values_compact)); |
| 237 | |
| 238 | annotate_arg_emitter arg_emitter; |
| 239 | ui_out_emit_tuple tuple_emitter (uiout, NULL); |
| 240 | fprintf_symbol_filtered (&stb, SYMBOL_PRINT_NAME (arg->sym), |
| 241 | SYMBOL_LANGUAGE (arg->sym), DMGL_PARAMS | DMGL_ANSI); |
| 242 | if (arg->entry_kind == print_entry_values_compact) |
| 243 | { |
| 244 | /* It is OK to provide invalid MI-like stream as with |
| 245 | PRINT_ENTRY_VALUE_COMPACT we never use MI. */ |
| 246 | stb.puts ("="); |
| 247 | |
| 248 | fprintf_symbol_filtered (&stb, SYMBOL_PRINT_NAME (arg->sym), |
| 249 | SYMBOL_LANGUAGE (arg->sym), |
| 250 | DMGL_PARAMS | DMGL_ANSI); |
| 251 | } |
| 252 | if (arg->entry_kind == print_entry_values_only |
| 253 | || arg->entry_kind == print_entry_values_compact) |
| 254 | stb.puts ("@entry"); |
| 255 | uiout->field_stream ("name", stb); |
| 256 | annotate_arg_name_end (); |
| 257 | uiout->text ("="); |
| 258 | |
| 259 | if (!arg->val && !arg->error) |
| 260 | uiout->text ("..."); |
| 261 | else |
| 262 | { |
| 263 | if (arg->error) |
| 264 | error_message = arg->error; |
| 265 | else |
| 266 | { |
| 267 | TRY |
| 268 | { |
| 269 | const struct language_defn *language; |
| 270 | struct value_print_options opts; |
| 271 | |
| 272 | /* Avoid value_print because it will deref ref parameters. We |
| 273 | just want to print their addresses. Print ??? for args whose |
| 274 | address we do not know. We pass 2 as "recurse" to val_print |
| 275 | because our standard indentation here is 4 spaces, and |
| 276 | val_print indents 2 for each recurse. */ |
| 277 | |
| 278 | annotate_arg_value (value_type (arg->val)); |
| 279 | |
| 280 | /* Use the appropriate language to display our symbol, unless the |
| 281 | user forced the language to a specific language. */ |
| 282 | if (language_mode == language_mode_auto) |
| 283 | language = language_def (SYMBOL_LANGUAGE (arg->sym)); |
| 284 | else |
| 285 | language = current_language; |
| 286 | |
| 287 | get_no_prettyformat_print_options (&opts); |
| 288 | opts.deref_ref = 1; |
| 289 | opts.raw = print_raw_frame_arguments; |
| 290 | |
| 291 | /* True in "summary" mode, false otherwise. */ |
| 292 | opts.summary = !strcmp (print_frame_arguments, "scalars"); |
| 293 | |
| 294 | common_val_print (arg->val, &stb, 2, &opts, language); |
| 295 | } |
| 296 | CATCH (except, RETURN_MASK_ERROR) |
| 297 | { |
| 298 | error_message = except.message; |
| 299 | } |
| 300 | END_CATCH |
| 301 | } |
| 302 | if (error_message != NULL) |
| 303 | stb.printf (_("<error reading variable: %s>"), error_message); |
| 304 | } |
| 305 | |
| 306 | uiout->field_stream ("value", stb); |
| 307 | } |
| 308 | |
| 309 | /* Read in inferior function local SYM at FRAME into ARGP. Caller is |
| 310 | responsible for xfree of ARGP->ERROR. This function never throws an |
| 311 | exception. */ |
| 312 | |
| 313 | void |
| 314 | read_frame_local (struct symbol *sym, struct frame_info *frame, |
| 315 | struct frame_arg *argp) |
| 316 | { |
| 317 | argp->sym = sym; |
| 318 | argp->val = NULL; |
| 319 | argp->error = NULL; |
| 320 | |
| 321 | TRY |
| 322 | { |
| 323 | argp->val = read_var_value (sym, NULL, frame); |
| 324 | } |
| 325 | CATCH (except, RETURN_MASK_ERROR) |
| 326 | { |
| 327 | argp->error = xstrdup (except.message); |
| 328 | } |
| 329 | END_CATCH |
| 330 | } |
| 331 | |
| 332 | /* Read in inferior function parameter SYM at FRAME into ARGP. Caller is |
| 333 | responsible for xfree of ARGP->ERROR. This function never throws an |
| 334 | exception. */ |
| 335 | |
| 336 | void |
| 337 | read_frame_arg (struct symbol *sym, struct frame_info *frame, |
| 338 | struct frame_arg *argp, struct frame_arg *entryargp) |
| 339 | { |
| 340 | struct value *val = NULL, *entryval = NULL; |
| 341 | char *val_error = NULL, *entryval_error = NULL; |
| 342 | int val_equal = 0; |
| 343 | |
| 344 | if (print_entry_values != print_entry_values_only |
| 345 | && print_entry_values != print_entry_values_preferred) |
| 346 | { |
| 347 | TRY |
| 348 | { |
| 349 | val = read_var_value (sym, NULL, frame); |
| 350 | } |
| 351 | CATCH (except, RETURN_MASK_ERROR) |
| 352 | { |
| 353 | val_error = (char *) alloca (strlen (except.message) + 1); |
| 354 | strcpy (val_error, except.message); |
| 355 | } |
| 356 | END_CATCH |
| 357 | } |
| 358 | |
| 359 | if (SYMBOL_COMPUTED_OPS (sym) != NULL |
| 360 | && SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry != NULL |
| 361 | && print_entry_values != print_entry_values_no |
| 362 | && (print_entry_values != print_entry_values_if_needed |
| 363 | || !val || value_optimized_out (val))) |
| 364 | { |
| 365 | TRY |
| 366 | { |
| 367 | const struct symbol_computed_ops *ops; |
| 368 | |
| 369 | ops = SYMBOL_COMPUTED_OPS (sym); |
| 370 | entryval = ops->read_variable_at_entry (sym, frame); |
| 371 | } |
| 372 | CATCH (except, RETURN_MASK_ERROR) |
| 373 | { |
| 374 | if (except.error != NO_ENTRY_VALUE_ERROR) |
| 375 | { |
| 376 | entryval_error = (char *) alloca (strlen (except.message) + 1); |
| 377 | strcpy (entryval_error, except.message); |
| 378 | } |
| 379 | } |
| 380 | END_CATCH |
| 381 | |
| 382 | if (entryval != NULL && value_optimized_out (entryval)) |
| 383 | entryval = NULL; |
| 384 | |
| 385 | if (print_entry_values == print_entry_values_compact |
| 386 | || print_entry_values == print_entry_values_default) |
| 387 | { |
| 388 | /* For MI do not try to use print_entry_values_compact for ARGP. */ |
| 389 | |
| 390 | if (val && entryval && !current_uiout->is_mi_like_p ()) |
| 391 | { |
| 392 | struct type *type = value_type (val); |
| 393 | |
| 394 | if (value_lazy (val)) |
| 395 | value_fetch_lazy (val); |
| 396 | if (value_lazy (entryval)) |
| 397 | value_fetch_lazy (entryval); |
| 398 | |
| 399 | if (value_contents_eq (val, 0, entryval, 0, TYPE_LENGTH (type))) |
| 400 | { |
| 401 | /* Initialize it just to avoid a GCC false warning. */ |
| 402 | struct value *val_deref = NULL, *entryval_deref; |
| 403 | |
| 404 | /* DW_AT_call_value does match with the current |
| 405 | value. If it is a reference still try to verify if |
| 406 | dereferenced DW_AT_call_data_value does not differ. */ |
| 407 | |
| 408 | TRY |
| 409 | { |
| 410 | struct type *type_deref; |
| 411 | |
| 412 | val_deref = coerce_ref (val); |
| 413 | if (value_lazy (val_deref)) |
| 414 | value_fetch_lazy (val_deref); |
| 415 | type_deref = value_type (val_deref); |
| 416 | |
| 417 | entryval_deref = coerce_ref (entryval); |
| 418 | if (value_lazy (entryval_deref)) |
| 419 | value_fetch_lazy (entryval_deref); |
| 420 | |
| 421 | /* If the reference addresses match but dereferenced |
| 422 | content does not match print them. */ |
| 423 | if (val != val_deref |
| 424 | && value_contents_eq (val_deref, 0, |
| 425 | entryval_deref, 0, |
| 426 | TYPE_LENGTH (type_deref))) |
| 427 | val_equal = 1; |
| 428 | } |
| 429 | CATCH (except, RETURN_MASK_ERROR) |
| 430 | { |
| 431 | /* If the dereferenced content could not be |
| 432 | fetched do not display anything. */ |
| 433 | if (except.error == NO_ENTRY_VALUE_ERROR) |
| 434 | val_equal = 1; |
| 435 | else if (except.message != NULL) |
| 436 | { |
| 437 | entryval_error = (char *) alloca (strlen (except.message) + 1); |
| 438 | strcpy (entryval_error, except.message); |
| 439 | } |
| 440 | } |
| 441 | END_CATCH |
| 442 | |
| 443 | /* Value was not a reference; and its content matches. */ |
| 444 | if (val == val_deref) |
| 445 | val_equal = 1; |
| 446 | |
| 447 | if (val_equal) |
| 448 | entryval = NULL; |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | /* Try to remove possibly duplicate error message for ENTRYARGP even |
| 453 | in MI mode. */ |
| 454 | |
| 455 | if (val_error && entryval_error |
| 456 | && strcmp (val_error, entryval_error) == 0) |
| 457 | { |
| 458 | entryval_error = NULL; |
| 459 | |
| 460 | /* Do not se VAL_EQUAL as the same error message may be shown for |
| 461 | the entry value even if no entry values are present in the |
| 462 | inferior. */ |
| 463 | } |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | if (entryval == NULL) |
| 468 | { |
| 469 | if (print_entry_values == print_entry_values_preferred) |
| 470 | { |
| 471 | gdb_assert (val == NULL); |
| 472 | |
| 473 | TRY |
| 474 | { |
| 475 | val = read_var_value (sym, NULL, frame); |
| 476 | } |
| 477 | CATCH (except, RETURN_MASK_ERROR) |
| 478 | { |
| 479 | val_error = (char *) alloca (strlen (except.message) + 1); |
| 480 | strcpy (val_error, except.message); |
| 481 | } |
| 482 | END_CATCH |
| 483 | } |
| 484 | if (print_entry_values == print_entry_values_only |
| 485 | || print_entry_values == print_entry_values_both |
| 486 | || (print_entry_values == print_entry_values_preferred |
| 487 | && (!val || value_optimized_out (val)))) |
| 488 | { |
| 489 | entryval = allocate_optimized_out_value (SYMBOL_TYPE (sym)); |
| 490 | entryval_error = NULL; |
| 491 | } |
| 492 | } |
| 493 | if ((print_entry_values == print_entry_values_compact |
| 494 | || print_entry_values == print_entry_values_if_needed |
| 495 | || print_entry_values == print_entry_values_preferred) |
| 496 | && (!val || value_optimized_out (val)) && entryval != NULL) |
| 497 | { |
| 498 | val = NULL; |
| 499 | val_error = NULL; |
| 500 | } |
| 501 | |
| 502 | argp->sym = sym; |
| 503 | argp->val = val; |
| 504 | argp->error = val_error ? xstrdup (val_error) : NULL; |
| 505 | if (!val && !val_error) |
| 506 | argp->entry_kind = print_entry_values_only; |
| 507 | else if ((print_entry_values == print_entry_values_compact |
| 508 | || print_entry_values == print_entry_values_default) && val_equal) |
| 509 | { |
| 510 | argp->entry_kind = print_entry_values_compact; |
| 511 | gdb_assert (!current_uiout->is_mi_like_p ()); |
| 512 | } |
| 513 | else |
| 514 | argp->entry_kind = print_entry_values_no; |
| 515 | |
| 516 | entryargp->sym = sym; |
| 517 | entryargp->val = entryval; |
| 518 | entryargp->error = entryval_error ? xstrdup (entryval_error) : NULL; |
| 519 | if (!entryval && !entryval_error) |
| 520 | entryargp->entry_kind = print_entry_values_no; |
| 521 | else |
| 522 | entryargp->entry_kind = print_entry_values_only; |
| 523 | } |
| 524 | |
| 525 | /* Print the arguments of frame FRAME on STREAM, given the function |
| 526 | FUNC running in that frame (as a symbol), where NUM is the number |
| 527 | of arguments according to the stack frame (or -1 if the number of |
| 528 | arguments is unknown). */ |
| 529 | |
| 530 | /* Note that currently the "number of arguments according to the |
| 531 | stack frame" is only known on VAX where i refers to the "number of |
| 532 | ints of arguments according to the stack frame". */ |
| 533 | |
| 534 | static void |
| 535 | print_frame_args (struct symbol *func, struct frame_info *frame, |
| 536 | int num, struct ui_file *stream) |
| 537 | { |
| 538 | struct ui_out *uiout = current_uiout; |
| 539 | int first = 1; |
| 540 | /* Offset of next stack argument beyond the one we have seen that is |
| 541 | at the highest offset, or -1 if we haven't come to a stack |
| 542 | argument yet. */ |
| 543 | long highest_offset = -1; |
| 544 | /* Number of ints of arguments that we have printed so far. */ |
| 545 | int args_printed = 0; |
| 546 | /* True if we should print arguments, false otherwise. */ |
| 547 | int print_args = strcmp (print_frame_arguments, "none"); |
| 548 | |
| 549 | if (func) |
| 550 | { |
| 551 | const struct block *b = SYMBOL_BLOCK_VALUE (func); |
| 552 | struct block_iterator iter; |
| 553 | struct symbol *sym; |
| 554 | |
| 555 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 556 | { |
| 557 | struct frame_arg arg, entryarg; |
| 558 | |
| 559 | QUIT; |
| 560 | |
| 561 | /* Keep track of the highest stack argument offset seen, and |
| 562 | skip over any kinds of symbols we don't care about. */ |
| 563 | |
| 564 | if (!SYMBOL_IS_ARGUMENT (sym)) |
| 565 | continue; |
| 566 | |
| 567 | switch (SYMBOL_CLASS (sym)) |
| 568 | { |
| 569 | case LOC_ARG: |
| 570 | case LOC_REF_ARG: |
| 571 | { |
| 572 | long current_offset = SYMBOL_VALUE (sym); |
| 573 | int arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym)); |
| 574 | |
| 575 | /* Compute address of next argument by adding the size of |
| 576 | this argument and rounding to an int boundary. */ |
| 577 | current_offset = |
| 578 | ((current_offset + arg_size + sizeof (int) - 1) |
| 579 | & ~(sizeof (int) - 1)); |
| 580 | |
| 581 | /* If this is the highest offset seen yet, set |
| 582 | highest_offset. */ |
| 583 | if (highest_offset == -1 |
| 584 | || (current_offset > highest_offset)) |
| 585 | highest_offset = current_offset; |
| 586 | |
| 587 | /* Add the number of ints we're about to print to |
| 588 | args_printed. */ |
| 589 | args_printed += (arg_size + sizeof (int) - 1) / sizeof (int); |
| 590 | } |
| 591 | |
| 592 | /* We care about types of symbols, but don't need to |
| 593 | keep track of stack offsets in them. */ |
| 594 | case LOC_REGISTER: |
| 595 | case LOC_REGPARM_ADDR: |
| 596 | case LOC_COMPUTED: |
| 597 | case LOC_OPTIMIZED_OUT: |
| 598 | default: |
| 599 | break; |
| 600 | } |
| 601 | |
| 602 | /* We have to look up the symbol because arguments can have |
| 603 | two entries (one a parameter, one a local) and the one we |
| 604 | want is the local, which lookup_symbol will find for us. |
| 605 | This includes gcc1 (not gcc2) on SPARC when passing a |
| 606 | small structure and gcc2 when the argument type is float |
| 607 | and it is passed as a double and converted to float by |
| 608 | the prologue (in the latter case the type of the LOC_ARG |
| 609 | symbol is double and the type of the LOC_LOCAL symbol is |
| 610 | float). */ |
| 611 | /* But if the parameter name is null, don't try it. Null |
| 612 | parameter names occur on the RS/6000, for traceback |
| 613 | tables. FIXME, should we even print them? */ |
| 614 | |
| 615 | if (*SYMBOL_LINKAGE_NAME (sym)) |
| 616 | { |
| 617 | struct symbol *nsym; |
| 618 | |
| 619 | nsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), |
| 620 | b, VAR_DOMAIN, NULL).symbol; |
| 621 | gdb_assert (nsym != NULL); |
| 622 | if (SYMBOL_CLASS (nsym) == LOC_REGISTER |
| 623 | && !SYMBOL_IS_ARGUMENT (nsym)) |
| 624 | { |
| 625 | /* There is a LOC_ARG/LOC_REGISTER pair. This means |
| 626 | that it was passed on the stack and loaded into a |
| 627 | register, or passed in a register and stored in a |
| 628 | stack slot. GDB 3.x used the LOC_ARG; GDB |
| 629 | 4.0-4.11 used the LOC_REGISTER. |
| 630 | |
| 631 | Reasons for using the LOC_ARG: |
| 632 | |
| 633 | (1) Because find_saved_registers may be slow for |
| 634 | remote debugging. |
| 635 | |
| 636 | (2) Because registers are often re-used and stack |
| 637 | slots rarely (never?) are. Therefore using |
| 638 | the stack slot is much less likely to print |
| 639 | garbage. |
| 640 | |
| 641 | Reasons why we might want to use the LOC_REGISTER: |
| 642 | |
| 643 | (1) So that the backtrace prints the same value |
| 644 | as "print foo". I see no compelling reason |
| 645 | why this needs to be the case; having the |
| 646 | backtrace print the value which was passed |
| 647 | in, and "print foo" print the value as |
| 648 | modified within the called function, makes |
| 649 | perfect sense to me. |
| 650 | |
| 651 | Additional note: It might be nice if "info args" |
| 652 | displayed both values. |
| 653 | |
| 654 | One more note: There is a case with SPARC |
| 655 | structure passing where we need to use the |
| 656 | LOC_REGISTER, but this is dealt with by creating |
| 657 | a single LOC_REGPARM in symbol reading. */ |
| 658 | |
| 659 | /* Leave sym (the LOC_ARG) alone. */ |
| 660 | ; |
| 661 | } |
| 662 | else |
| 663 | sym = nsym; |
| 664 | } |
| 665 | |
| 666 | /* Print the current arg. */ |
| 667 | if (!first) |
| 668 | uiout->text (", "); |
| 669 | uiout->wrap_hint (" "); |
| 670 | |
| 671 | if (!print_args) |
| 672 | { |
| 673 | memset (&arg, 0, sizeof (arg)); |
| 674 | arg.sym = sym; |
| 675 | arg.entry_kind = print_entry_values_no; |
| 676 | memset (&entryarg, 0, sizeof (entryarg)); |
| 677 | entryarg.sym = sym; |
| 678 | entryarg.entry_kind = print_entry_values_no; |
| 679 | } |
| 680 | else |
| 681 | read_frame_arg (sym, frame, &arg, &entryarg); |
| 682 | |
| 683 | if (arg.entry_kind != print_entry_values_only) |
| 684 | print_frame_arg (&arg); |
| 685 | |
| 686 | if (entryarg.entry_kind != print_entry_values_no) |
| 687 | { |
| 688 | if (arg.entry_kind != print_entry_values_only) |
| 689 | { |
| 690 | uiout->text (", "); |
| 691 | uiout->wrap_hint (" "); |
| 692 | } |
| 693 | |
| 694 | print_frame_arg (&entryarg); |
| 695 | } |
| 696 | |
| 697 | xfree (arg.error); |
| 698 | xfree (entryarg.error); |
| 699 | |
| 700 | first = 0; |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | /* Don't print nameless args in situations where we don't know |
| 705 | enough about the stack to find them. */ |
| 706 | if (num != -1) |
| 707 | { |
| 708 | long start; |
| 709 | |
| 710 | if (highest_offset == -1) |
| 711 | start = gdbarch_frame_args_skip (get_frame_arch (frame)); |
| 712 | else |
| 713 | start = highest_offset; |
| 714 | |
| 715 | print_frame_nameless_args (frame, start, num - args_printed, |
| 716 | first, stream); |
| 717 | } |
| 718 | } |
| 719 | |
| 720 | /* Set the current source and line to the location given by frame |
| 721 | FRAME, if possible. When CENTER is true, adjust so the relevant |
| 722 | line is in the center of the next 'list'. */ |
| 723 | |
| 724 | void |
| 725 | set_current_sal_from_frame (struct frame_info *frame) |
| 726 | { |
| 727 | symtab_and_line sal = find_frame_sal (frame); |
| 728 | if (sal.symtab != NULL) |
| 729 | set_current_source_symtab_and_line (sal); |
| 730 | } |
| 731 | |
| 732 | /* If ON, GDB will display disassembly of the next source line when |
| 733 | execution of the program being debugged stops. |
| 734 | If AUTO (which is the default), or there's no line info to determine |
| 735 | the source line of the next instruction, display disassembly of next |
| 736 | instruction instead. */ |
| 737 | |
| 738 | static enum auto_boolean disassemble_next_line; |
| 739 | |
| 740 | static void |
| 741 | show_disassemble_next_line (struct ui_file *file, int from_tty, |
| 742 | struct cmd_list_element *c, |
| 743 | const char *value) |
| 744 | { |
| 745 | fprintf_filtered (file, |
| 746 | _("Debugger's willingness to use " |
| 747 | "disassemble-next-line is %s.\n"), |
| 748 | value); |
| 749 | } |
| 750 | |
| 751 | /* Use TRY_CATCH to catch the exception from the gdb_disassembly |
| 752 | because it will be broken by filter sometime. */ |
| 753 | |
| 754 | static void |
| 755 | do_gdb_disassembly (struct gdbarch *gdbarch, |
| 756 | int how_many, CORE_ADDR low, CORE_ADDR high) |
| 757 | { |
| 758 | |
| 759 | TRY |
| 760 | { |
| 761 | gdb_disassembly (gdbarch, current_uiout, |
| 762 | DISASSEMBLY_RAW_INSN, how_many, |
| 763 | low, high); |
| 764 | } |
| 765 | CATCH (exception, RETURN_MASK_ERROR) |
| 766 | { |
| 767 | /* If an exception was thrown while doing the disassembly, print |
| 768 | the error message, to give the user a clue of what happened. */ |
| 769 | exception_print (gdb_stderr, exception); |
| 770 | } |
| 771 | END_CATCH |
| 772 | } |
| 773 | |
| 774 | /* Print information about frame FRAME. The output is format according |
| 775 | to PRINT_LEVEL and PRINT_WHAT and PRINT_ARGS. The meaning of |
| 776 | PRINT_WHAT is: |
| 777 | |
| 778 | SRC_LINE: Print only source line. |
| 779 | LOCATION: Print only location. |
| 780 | LOC_AND_SRC: Print location and source line. |
| 781 | |
| 782 | Used in "where" output, and to emit breakpoint or step |
| 783 | messages. */ |
| 784 | |
| 785 | void |
| 786 | print_frame_info (struct frame_info *frame, int print_level, |
| 787 | enum print_what print_what, int print_args, |
| 788 | int set_current_sal) |
| 789 | { |
| 790 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 791 | int source_print; |
| 792 | int location_print; |
| 793 | struct ui_out *uiout = current_uiout; |
| 794 | |
| 795 | if (get_frame_type (frame) == DUMMY_FRAME |
| 796 | || get_frame_type (frame) == SIGTRAMP_FRAME |
| 797 | || get_frame_type (frame) == ARCH_FRAME) |
| 798 | { |
| 799 | ui_out_emit_tuple tuple_emitter (uiout, "frame"); |
| 800 | |
| 801 | annotate_frame_begin (print_level ? frame_relative_level (frame) : 0, |
| 802 | gdbarch, get_frame_pc (frame)); |
| 803 | |
| 804 | /* Do this regardless of SOURCE because we don't have any source |
| 805 | to list for this frame. */ |
| 806 | if (print_level) |
| 807 | { |
| 808 | uiout->text ("#"); |
| 809 | uiout->field_fmt_int (2, ui_left, "level", |
| 810 | frame_relative_level (frame)); |
| 811 | } |
| 812 | if (uiout->is_mi_like_p ()) |
| 813 | { |
| 814 | annotate_frame_address (); |
| 815 | uiout->field_core_addr ("addr", |
| 816 | gdbarch, get_frame_pc (frame)); |
| 817 | annotate_frame_address_end (); |
| 818 | } |
| 819 | |
| 820 | if (get_frame_type (frame) == DUMMY_FRAME) |
| 821 | { |
| 822 | annotate_function_call (); |
| 823 | uiout->field_string ("func", "<function called from gdb>"); |
| 824 | } |
| 825 | else if (get_frame_type (frame) == SIGTRAMP_FRAME) |
| 826 | { |
| 827 | annotate_signal_handler_caller (); |
| 828 | uiout->field_string ("func", "<signal handler called>"); |
| 829 | } |
| 830 | else if (get_frame_type (frame) == ARCH_FRAME) |
| 831 | { |
| 832 | uiout->field_string ("func", "<cross-architecture call>"); |
| 833 | } |
| 834 | uiout->text ("\n"); |
| 835 | annotate_frame_end (); |
| 836 | |
| 837 | /* If disassemble-next-line is set to auto or on output the next |
| 838 | instruction. */ |
| 839 | if (disassemble_next_line == AUTO_BOOLEAN_AUTO |
| 840 | || disassemble_next_line == AUTO_BOOLEAN_TRUE) |
| 841 | do_gdb_disassembly (get_frame_arch (frame), 1, |
| 842 | get_frame_pc (frame), get_frame_pc (frame) + 1); |
| 843 | |
| 844 | return; |
| 845 | } |
| 846 | |
| 847 | /* If FRAME is not the innermost frame, that normally means that |
| 848 | FRAME->pc points to *after* the call instruction, and we want to |
| 849 | get the line containing the call, never the next line. But if |
| 850 | the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the |
| 851 | next frame was not entered as the result of a call, and we want |
| 852 | to get the line containing FRAME->pc. */ |
| 853 | symtab_and_line sal = find_frame_sal (frame); |
| 854 | |
| 855 | location_print = (print_what == LOCATION |
| 856 | || print_what == LOC_AND_ADDRESS |
| 857 | || print_what == SRC_AND_LOC); |
| 858 | |
| 859 | if (location_print || !sal.symtab) |
| 860 | print_frame (frame, print_level, print_what, print_args, sal); |
| 861 | |
| 862 | source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC); |
| 863 | |
| 864 | /* If disassemble-next-line is set to auto or on and doesn't have |
| 865 | the line debug messages for $pc, output the next instruction. */ |
| 866 | if ((disassemble_next_line == AUTO_BOOLEAN_AUTO |
| 867 | || disassemble_next_line == AUTO_BOOLEAN_TRUE) |
| 868 | && source_print && !sal.symtab) |
| 869 | do_gdb_disassembly (get_frame_arch (frame), 1, |
| 870 | get_frame_pc (frame), get_frame_pc (frame) + 1); |
| 871 | |
| 872 | if (source_print && sal.symtab) |
| 873 | { |
| 874 | int done = 0; |
| 875 | int mid_statement = ((print_what == SRC_LINE) |
| 876 | && frame_show_address (frame, sal)); |
| 877 | |
| 878 | if (annotation_level) |
| 879 | done = identify_source_line (sal.symtab, sal.line, mid_statement, |
| 880 | get_frame_pc (frame)); |
| 881 | if (!done) |
| 882 | { |
| 883 | if (deprecated_print_frame_info_listing_hook) |
| 884 | deprecated_print_frame_info_listing_hook (sal.symtab, |
| 885 | sal.line, |
| 886 | sal.line + 1, 0); |
| 887 | else |
| 888 | { |
| 889 | struct value_print_options opts; |
| 890 | |
| 891 | get_user_print_options (&opts); |
| 892 | /* We used to do this earlier, but that is clearly |
| 893 | wrong. This function is used by many different |
| 894 | parts of gdb, including normal_stop in infrun.c, |
| 895 | which uses this to print out the current PC |
| 896 | when we stepi/nexti into the middle of a source |
| 897 | line. Only the command line really wants this |
| 898 | behavior. Other UIs probably would like the |
| 899 | ability to decide for themselves if it is desired. */ |
| 900 | if (opts.addressprint && mid_statement) |
| 901 | { |
| 902 | uiout->field_core_addr ("addr", |
| 903 | gdbarch, get_frame_pc (frame)); |
| 904 | uiout->text ("\t"); |
| 905 | } |
| 906 | |
| 907 | print_source_lines (sal.symtab, sal.line, sal.line + 1, 0); |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | /* If disassemble-next-line is set to on and there is line debug |
| 912 | messages, output assembly codes for next line. */ |
| 913 | if (disassemble_next_line == AUTO_BOOLEAN_TRUE) |
| 914 | do_gdb_disassembly (get_frame_arch (frame), -1, sal.pc, sal.end); |
| 915 | } |
| 916 | |
| 917 | if (set_current_sal) |
| 918 | { |
| 919 | CORE_ADDR pc; |
| 920 | |
| 921 | if (get_frame_pc_if_available (frame, &pc)) |
| 922 | set_last_displayed_sal (1, sal.pspace, pc, sal.symtab, sal.line); |
| 923 | else |
| 924 | set_last_displayed_sal (0, 0, 0, 0, 0); |
| 925 | } |
| 926 | |
| 927 | annotate_frame_end (); |
| 928 | |
| 929 | gdb_flush (gdb_stdout); |
| 930 | } |
| 931 | |
| 932 | /* Remember the last symtab and line we displayed, which we use e.g. |
| 933 | * as the place to put a breakpoint when the `break' command is |
| 934 | * invoked with no arguments. */ |
| 935 | |
| 936 | static void |
| 937 | set_last_displayed_sal (int valid, struct program_space *pspace, |
| 938 | CORE_ADDR addr, struct symtab *symtab, |
| 939 | int line) |
| 940 | { |
| 941 | last_displayed_sal_valid = valid; |
| 942 | last_displayed_pspace = pspace; |
| 943 | last_displayed_addr = addr; |
| 944 | last_displayed_symtab = symtab; |
| 945 | last_displayed_line = line; |
| 946 | if (valid && pspace == NULL) |
| 947 | { |
| 948 | clear_last_displayed_sal (); |
| 949 | internal_error (__FILE__, __LINE__, |
| 950 | _("Trying to set NULL pspace.")); |
| 951 | } |
| 952 | } |
| 953 | |
| 954 | /* Forget the last sal we displayed. */ |
| 955 | |
| 956 | void |
| 957 | clear_last_displayed_sal (void) |
| 958 | { |
| 959 | last_displayed_sal_valid = 0; |
| 960 | last_displayed_pspace = 0; |
| 961 | last_displayed_addr = 0; |
| 962 | last_displayed_symtab = 0; |
| 963 | last_displayed_line = 0; |
| 964 | } |
| 965 | |
| 966 | /* Is our record of the last sal we displayed valid? If not, |
| 967 | * the get_last_displayed_* functions will return NULL or 0, as |
| 968 | * appropriate. */ |
| 969 | |
| 970 | int |
| 971 | last_displayed_sal_is_valid (void) |
| 972 | { |
| 973 | return last_displayed_sal_valid; |
| 974 | } |
| 975 | |
| 976 | /* Get the pspace of the last sal we displayed, if it's valid. */ |
| 977 | |
| 978 | struct program_space * |
| 979 | get_last_displayed_pspace (void) |
| 980 | { |
| 981 | if (last_displayed_sal_valid) |
| 982 | return last_displayed_pspace; |
| 983 | return 0; |
| 984 | } |
| 985 | |
| 986 | /* Get the address of the last sal we displayed, if it's valid. */ |
| 987 | |
| 988 | CORE_ADDR |
| 989 | get_last_displayed_addr (void) |
| 990 | { |
| 991 | if (last_displayed_sal_valid) |
| 992 | return last_displayed_addr; |
| 993 | return 0; |
| 994 | } |
| 995 | |
| 996 | /* Get the symtab of the last sal we displayed, if it's valid. */ |
| 997 | |
| 998 | struct symtab* |
| 999 | get_last_displayed_symtab (void) |
| 1000 | { |
| 1001 | if (last_displayed_sal_valid) |
| 1002 | return last_displayed_symtab; |
| 1003 | return 0; |
| 1004 | } |
| 1005 | |
| 1006 | /* Get the line of the last sal we displayed, if it's valid. */ |
| 1007 | |
| 1008 | int |
| 1009 | get_last_displayed_line (void) |
| 1010 | { |
| 1011 | if (last_displayed_sal_valid) |
| 1012 | return last_displayed_line; |
| 1013 | return 0; |
| 1014 | } |
| 1015 | |
| 1016 | /* Get the last sal we displayed, if it's valid. */ |
| 1017 | |
| 1018 | symtab_and_line |
| 1019 | get_last_displayed_sal () |
| 1020 | { |
| 1021 | symtab_and_line sal; |
| 1022 | |
| 1023 | if (last_displayed_sal_valid) |
| 1024 | { |
| 1025 | sal.pspace = last_displayed_pspace; |
| 1026 | sal.pc = last_displayed_addr; |
| 1027 | sal.symtab = last_displayed_symtab; |
| 1028 | sal.line = last_displayed_line; |
| 1029 | } |
| 1030 | |
| 1031 | return sal; |
| 1032 | } |
| 1033 | |
| 1034 | |
| 1035 | /* Attempt to obtain the name, FUNLANG and optionally FUNCP of the function |
| 1036 | corresponding to FRAME. */ |
| 1037 | |
| 1038 | gdb::unique_xmalloc_ptr<char> |
| 1039 | find_frame_funname (struct frame_info *frame, enum language *funlang, |
| 1040 | struct symbol **funcp) |
| 1041 | { |
| 1042 | struct symbol *func; |
| 1043 | gdb::unique_xmalloc_ptr<char> funname; |
| 1044 | |
| 1045 | *funlang = language_unknown; |
| 1046 | if (funcp) |
| 1047 | *funcp = NULL; |
| 1048 | |
| 1049 | func = get_frame_function (frame); |
| 1050 | if (func) |
| 1051 | { |
| 1052 | /* In certain pathological cases, the symtabs give the wrong |
| 1053 | function (when we are in the first function in a file which |
| 1054 | is compiled without debugging symbols, the previous function |
| 1055 | is compiled with debugging symbols, and the "foo.o" symbol |
| 1056 | that is supposed to tell us where the file with debugging |
| 1057 | symbols ends has been truncated by ar because it is longer |
| 1058 | than 15 characters). This also occurs if the user uses asm() |
| 1059 | to create a function but not stabs for it (in a file compiled |
| 1060 | with -g). |
| 1061 | |
| 1062 | So look in the minimal symbol tables as well, and if it comes |
| 1063 | up with a larger address for the function use that instead. |
| 1064 | I don't think this can ever cause any problems; there |
| 1065 | shouldn't be any minimal symbols in the middle of a function; |
| 1066 | if this is ever changed many parts of GDB will need to be |
| 1067 | changed (and we'll create a find_pc_minimal_function or some |
| 1068 | such). */ |
| 1069 | |
| 1070 | struct bound_minimal_symbol msymbol; |
| 1071 | |
| 1072 | /* Don't attempt to do this for inlined functions, which do not |
| 1073 | have a corresponding minimal symbol. */ |
| 1074 | if (!block_inlined_p (SYMBOL_BLOCK_VALUE (func))) |
| 1075 | msymbol |
| 1076 | = lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame)); |
| 1077 | else |
| 1078 | memset (&msymbol, 0, sizeof (msymbol)); |
| 1079 | |
| 1080 | if (msymbol.minsym != NULL |
| 1081 | && (BMSYMBOL_VALUE_ADDRESS (msymbol) |
| 1082 | > BLOCK_START (SYMBOL_BLOCK_VALUE (func)))) |
| 1083 | { |
| 1084 | /* We also don't know anything about the function besides |
| 1085 | its address and name. */ |
| 1086 | func = 0; |
| 1087 | funname.reset (xstrdup (MSYMBOL_PRINT_NAME (msymbol.minsym))); |
| 1088 | *funlang = MSYMBOL_LANGUAGE (msymbol.minsym); |
| 1089 | } |
| 1090 | else |
| 1091 | { |
| 1092 | const char *print_name = SYMBOL_PRINT_NAME (func); |
| 1093 | |
| 1094 | *funlang = SYMBOL_LANGUAGE (func); |
| 1095 | if (funcp) |
| 1096 | *funcp = func; |
| 1097 | if (*funlang == language_cplus) |
| 1098 | { |
| 1099 | /* It seems appropriate to use SYMBOL_PRINT_NAME() here, |
| 1100 | to display the demangled name that we already have |
| 1101 | stored in the symbol table, but we stored a version |
| 1102 | with DMGL_PARAMS turned on, and here we don't want to |
| 1103 | display parameters. So remove the parameters. */ |
| 1104 | funname = cp_remove_params (print_name); |
| 1105 | } |
| 1106 | |
| 1107 | /* If we didn't hit the C++ case above, set *funname |
| 1108 | here. */ |
| 1109 | if (funname == NULL) |
| 1110 | funname.reset (xstrdup (print_name)); |
| 1111 | } |
| 1112 | } |
| 1113 | else |
| 1114 | { |
| 1115 | struct bound_minimal_symbol msymbol; |
| 1116 | CORE_ADDR pc; |
| 1117 | |
| 1118 | if (!get_frame_address_in_block_if_available (frame, &pc)) |
| 1119 | return funname; |
| 1120 | |
| 1121 | msymbol = lookup_minimal_symbol_by_pc (pc); |
| 1122 | if (msymbol.minsym != NULL) |
| 1123 | { |
| 1124 | funname.reset (xstrdup (MSYMBOL_PRINT_NAME (msymbol.minsym))); |
| 1125 | *funlang = MSYMBOL_LANGUAGE (msymbol.minsym); |
| 1126 | } |
| 1127 | } |
| 1128 | |
| 1129 | return funname; |
| 1130 | } |
| 1131 | |
| 1132 | static void |
| 1133 | print_frame (struct frame_info *frame, int print_level, |
| 1134 | enum print_what print_what, int print_args, |
| 1135 | struct symtab_and_line sal) |
| 1136 | { |
| 1137 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 1138 | struct ui_out *uiout = current_uiout; |
| 1139 | enum language funlang = language_unknown; |
| 1140 | struct value_print_options opts; |
| 1141 | struct symbol *func; |
| 1142 | CORE_ADDR pc = 0; |
| 1143 | int pc_p; |
| 1144 | |
| 1145 | pc_p = get_frame_pc_if_available (frame, &pc); |
| 1146 | |
| 1147 | gdb::unique_xmalloc_ptr<char> funname |
| 1148 | = find_frame_funname (frame, &funlang, &func); |
| 1149 | |
| 1150 | annotate_frame_begin (print_level ? frame_relative_level (frame) : 0, |
| 1151 | gdbarch, pc); |
| 1152 | |
| 1153 | { |
| 1154 | ui_out_emit_tuple tuple_emitter (uiout, "frame"); |
| 1155 | |
| 1156 | if (print_level) |
| 1157 | { |
| 1158 | uiout->text ("#"); |
| 1159 | uiout->field_fmt_int (2, ui_left, "level", |
| 1160 | frame_relative_level (frame)); |
| 1161 | } |
| 1162 | get_user_print_options (&opts); |
| 1163 | if (opts.addressprint) |
| 1164 | if (!sal.symtab |
| 1165 | || frame_show_address (frame, sal) |
| 1166 | || print_what == LOC_AND_ADDRESS) |
| 1167 | { |
| 1168 | annotate_frame_address (); |
| 1169 | if (pc_p) |
| 1170 | uiout->field_core_addr ("addr", gdbarch, pc); |
| 1171 | else |
| 1172 | uiout->field_string ("addr", "<unavailable>"); |
| 1173 | annotate_frame_address_end (); |
| 1174 | uiout->text (" in "); |
| 1175 | } |
| 1176 | annotate_frame_function_name (); |
| 1177 | |
| 1178 | string_file stb; |
| 1179 | fprintf_symbol_filtered (&stb, funname ? funname.get () : "??", |
| 1180 | funlang, DMGL_ANSI); |
| 1181 | uiout->field_stream ("func", stb); |
| 1182 | uiout->wrap_hint (" "); |
| 1183 | annotate_frame_args (); |
| 1184 | |
| 1185 | uiout->text (" ("); |
| 1186 | if (print_args) |
| 1187 | { |
| 1188 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 1189 | int numargs; |
| 1190 | |
| 1191 | if (gdbarch_frame_num_args_p (gdbarch)) |
| 1192 | { |
| 1193 | numargs = gdbarch_frame_num_args (gdbarch, frame); |
| 1194 | gdb_assert (numargs >= 0); |
| 1195 | } |
| 1196 | else |
| 1197 | numargs = -1; |
| 1198 | |
| 1199 | { |
| 1200 | ui_out_emit_list list_emitter (uiout, "args"); |
| 1201 | TRY |
| 1202 | { |
| 1203 | print_frame_args (func, frame, numargs, gdb_stdout); |
| 1204 | } |
| 1205 | CATCH (e, RETURN_MASK_ERROR) |
| 1206 | { |
| 1207 | } |
| 1208 | END_CATCH |
| 1209 | |
| 1210 | /* FIXME: ARGS must be a list. If one argument is a string it |
| 1211 | will have " that will not be properly escaped. */ |
| 1212 | } |
| 1213 | QUIT; |
| 1214 | } |
| 1215 | uiout->text (")"); |
| 1216 | if (sal.symtab) |
| 1217 | { |
| 1218 | const char *filename_display; |
| 1219 | |
| 1220 | filename_display = symtab_to_filename_for_display (sal.symtab); |
| 1221 | annotate_frame_source_begin (); |
| 1222 | uiout->wrap_hint (" "); |
| 1223 | uiout->text (" at "); |
| 1224 | annotate_frame_source_file (); |
| 1225 | uiout->field_string ("file", filename_display); |
| 1226 | if (uiout->is_mi_like_p ()) |
| 1227 | { |
| 1228 | const char *fullname = symtab_to_fullname (sal.symtab); |
| 1229 | |
| 1230 | uiout->field_string ("fullname", fullname); |
| 1231 | } |
| 1232 | annotate_frame_source_file_end (); |
| 1233 | uiout->text (":"); |
| 1234 | annotate_frame_source_line (); |
| 1235 | uiout->field_int ("line", sal.line); |
| 1236 | annotate_frame_source_end (); |
| 1237 | } |
| 1238 | |
| 1239 | if (pc_p && (funname == NULL || sal.symtab == NULL)) |
| 1240 | { |
| 1241 | char *lib = solib_name_from_address (get_frame_program_space (frame), |
| 1242 | get_frame_pc (frame)); |
| 1243 | |
| 1244 | if (lib) |
| 1245 | { |
| 1246 | annotate_frame_where (); |
| 1247 | uiout->wrap_hint (" "); |
| 1248 | uiout->text (" from "); |
| 1249 | uiout->field_string ("from", lib); |
| 1250 | } |
| 1251 | } |
| 1252 | } |
| 1253 | |
| 1254 | uiout->text ("\n"); |
| 1255 | } |
| 1256 | \f |
| 1257 | |
| 1258 | /* Read a frame specification in whatever the appropriate format is from |
| 1259 | FRAME_EXP. Call error() if the specification is in any way invalid (so |
| 1260 | this function never returns NULL). When SELECTED_FRAME_P is non-NULL |
| 1261 | set its target to indicate that the default selected frame was used. */ |
| 1262 | |
| 1263 | static struct frame_info * |
| 1264 | parse_frame_specification (const char *frame_exp, int *selected_frame_p) |
| 1265 | { |
| 1266 | int numargs; |
| 1267 | struct value *args[4]; |
| 1268 | CORE_ADDR addrs[ARRAY_SIZE (args)]; |
| 1269 | |
| 1270 | if (frame_exp == NULL) |
| 1271 | numargs = 0; |
| 1272 | else |
| 1273 | { |
| 1274 | numargs = 0; |
| 1275 | while (1) |
| 1276 | { |
| 1277 | const char *p; |
| 1278 | |
| 1279 | /* Skip leading white space, bail of EOL. */ |
| 1280 | frame_exp = skip_spaces (frame_exp); |
| 1281 | if (!*frame_exp) |
| 1282 | break; |
| 1283 | |
| 1284 | /* Parse the argument, extract it, save it. */ |
| 1285 | for (p = frame_exp; |
| 1286 | *p && !ISSPACE (*p); |
| 1287 | p++); |
| 1288 | std::string addr_string (frame_exp, p - frame_exp); |
| 1289 | frame_exp = p; |
| 1290 | |
| 1291 | /* NOTE: Parse and evaluate expression, but do not use |
| 1292 | functions such as parse_and_eval_long or |
| 1293 | parse_and_eval_address to also extract the value. |
| 1294 | Instead value_as_long and value_as_address are used. |
| 1295 | This avoids problems with expressions that contain |
| 1296 | side-effects. */ |
| 1297 | if (numargs >= ARRAY_SIZE (args)) |
| 1298 | error (_("Too many args in frame specification")); |
| 1299 | args[numargs++] = parse_and_eval (addr_string.c_str ()); |
| 1300 | } |
| 1301 | } |
| 1302 | |
| 1303 | /* If no args, default to the selected frame. */ |
| 1304 | if (numargs == 0) |
| 1305 | { |
| 1306 | if (selected_frame_p != NULL) |
| 1307 | (*selected_frame_p) = 1; |
| 1308 | return get_selected_frame (_("No stack.")); |
| 1309 | } |
| 1310 | |
| 1311 | /* None of the remaining use the selected frame. */ |
| 1312 | if (selected_frame_p != NULL) |
| 1313 | (*selected_frame_p) = 0; |
| 1314 | |
| 1315 | /* Assume the single arg[0] is an integer, and try using that to |
| 1316 | select a frame relative to current. */ |
| 1317 | if (numargs == 1) |
| 1318 | { |
| 1319 | struct frame_info *fid; |
| 1320 | int level = value_as_long (args[0]); |
| 1321 | |
| 1322 | fid = find_relative_frame (get_current_frame (), &level); |
| 1323 | if (level == 0) |
| 1324 | /* find_relative_frame was successful. */ |
| 1325 | return fid; |
| 1326 | } |
| 1327 | |
| 1328 | /* Convert each value into a corresponding address. */ |
| 1329 | { |
| 1330 | int i; |
| 1331 | |
| 1332 | for (i = 0; i < numargs; i++) |
| 1333 | addrs[i] = value_as_address (args[i]); |
| 1334 | } |
| 1335 | |
| 1336 | /* Assume that the single arg[0] is an address, use that to identify |
| 1337 | a frame with a matching ID. Should this also accept stack/pc or |
| 1338 | stack/pc/special. */ |
| 1339 | if (numargs == 1) |
| 1340 | { |
| 1341 | struct frame_id id = frame_id_build_wild (addrs[0]); |
| 1342 | struct frame_info *fid; |
| 1343 | |
| 1344 | /* If (s)he specifies the frame with an address, he deserves |
| 1345 | what (s)he gets. Still, give the highest one that matches. |
| 1346 | (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't |
| 1347 | know). */ |
| 1348 | for (fid = get_current_frame (); |
| 1349 | fid != NULL; |
| 1350 | fid = get_prev_frame (fid)) |
| 1351 | { |
| 1352 | if (frame_id_eq (id, get_frame_id (fid))) |
| 1353 | { |
| 1354 | struct frame_info *prev_frame; |
| 1355 | |
| 1356 | while (1) |
| 1357 | { |
| 1358 | prev_frame = get_prev_frame (fid); |
| 1359 | if (!prev_frame |
| 1360 | || !frame_id_eq (id, get_frame_id (prev_frame))) |
| 1361 | break; |
| 1362 | fid = prev_frame; |
| 1363 | } |
| 1364 | return fid; |
| 1365 | } |
| 1366 | } |
| 1367 | } |
| 1368 | |
| 1369 | /* We couldn't identify the frame as an existing frame, but |
| 1370 | perhaps we can create one with a single argument. */ |
| 1371 | if (numargs == 1) |
| 1372 | return create_new_frame (addrs[0], 0); |
| 1373 | else if (numargs == 2) |
| 1374 | return create_new_frame (addrs[0], addrs[1]); |
| 1375 | else |
| 1376 | error (_("Too many args in frame specification")); |
| 1377 | } |
| 1378 | |
| 1379 | /* Print verbosely the selected frame or the frame at address |
| 1380 | ADDR_EXP. Absolutely all information in the frame is printed. */ |
| 1381 | |
| 1382 | static void |
| 1383 | info_frame_command (char *addr_exp, int from_tty) |
| 1384 | { |
| 1385 | struct frame_info *fi; |
| 1386 | struct symbol *func; |
| 1387 | struct symtab *s; |
| 1388 | struct frame_info *calling_frame_info; |
| 1389 | int numregs; |
| 1390 | const char *funname = 0; |
| 1391 | enum language funlang = language_unknown; |
| 1392 | const char *pc_regname; |
| 1393 | int selected_frame_p; |
| 1394 | struct gdbarch *gdbarch; |
| 1395 | CORE_ADDR frame_pc; |
| 1396 | int frame_pc_p; |
| 1397 | /* Initialize it to avoid "may be used uninitialized" warning. */ |
| 1398 | CORE_ADDR caller_pc = 0; |
| 1399 | int caller_pc_p = 0; |
| 1400 | |
| 1401 | fi = parse_frame_specification (addr_exp, &selected_frame_p); |
| 1402 | gdbarch = get_frame_arch (fi); |
| 1403 | |
| 1404 | /* Name of the value returned by get_frame_pc(). Per comments, "pc" |
| 1405 | is not a good name. */ |
| 1406 | if (gdbarch_pc_regnum (gdbarch) >= 0) |
| 1407 | /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can |
| 1408 | easily not match that of the internal value returned by |
| 1409 | get_frame_pc(). */ |
| 1410 | pc_regname = gdbarch_register_name (gdbarch, gdbarch_pc_regnum (gdbarch)); |
| 1411 | else |
| 1412 | /* But then, this is weird to. Even without gdbarch_pc_regnum, an |
| 1413 | architectures will often have a hardware register called "pc", |
| 1414 | and that register's value, again, can easily not match |
| 1415 | get_frame_pc(). */ |
| 1416 | pc_regname = "pc"; |
| 1417 | |
| 1418 | frame_pc_p = get_frame_pc_if_available (fi, &frame_pc); |
| 1419 | func = get_frame_function (fi); |
| 1420 | symtab_and_line sal = find_frame_sal (fi); |
| 1421 | s = sal.symtab; |
| 1422 | gdb::unique_xmalloc_ptr<char> func_only; |
| 1423 | if (func) |
| 1424 | { |
| 1425 | funname = SYMBOL_PRINT_NAME (func); |
| 1426 | funlang = SYMBOL_LANGUAGE (func); |
| 1427 | if (funlang == language_cplus) |
| 1428 | { |
| 1429 | /* It seems appropriate to use SYMBOL_PRINT_NAME() here, |
| 1430 | to display the demangled name that we already have |
| 1431 | stored in the symbol table, but we stored a version |
| 1432 | with DMGL_PARAMS turned on, and here we don't want to |
| 1433 | display parameters. So remove the parameters. */ |
| 1434 | func_only = cp_remove_params (funname); |
| 1435 | |
| 1436 | if (func_only) |
| 1437 | funname = func_only.get (); |
| 1438 | } |
| 1439 | } |
| 1440 | else if (frame_pc_p) |
| 1441 | { |
| 1442 | struct bound_minimal_symbol msymbol; |
| 1443 | |
| 1444 | msymbol = lookup_minimal_symbol_by_pc (frame_pc); |
| 1445 | if (msymbol.minsym != NULL) |
| 1446 | { |
| 1447 | funname = MSYMBOL_PRINT_NAME (msymbol.minsym); |
| 1448 | funlang = MSYMBOL_LANGUAGE (msymbol.minsym); |
| 1449 | } |
| 1450 | } |
| 1451 | calling_frame_info = get_prev_frame (fi); |
| 1452 | |
| 1453 | if (selected_frame_p && frame_relative_level (fi) >= 0) |
| 1454 | { |
| 1455 | printf_filtered (_("Stack level %d, frame at "), |
| 1456 | frame_relative_level (fi)); |
| 1457 | } |
| 1458 | else |
| 1459 | { |
| 1460 | printf_filtered (_("Stack frame at ")); |
| 1461 | } |
| 1462 | fputs_filtered (paddress (gdbarch, get_frame_base (fi)), gdb_stdout); |
| 1463 | printf_filtered (":\n"); |
| 1464 | printf_filtered (" %s = ", pc_regname); |
| 1465 | if (frame_pc_p) |
| 1466 | fputs_filtered (paddress (gdbarch, get_frame_pc (fi)), gdb_stdout); |
| 1467 | else |
| 1468 | fputs_filtered ("<unavailable>", gdb_stdout); |
| 1469 | |
| 1470 | wrap_here (" "); |
| 1471 | if (funname) |
| 1472 | { |
| 1473 | printf_filtered (" in "); |
| 1474 | fprintf_symbol_filtered (gdb_stdout, funname, funlang, |
| 1475 | DMGL_ANSI | DMGL_PARAMS); |
| 1476 | } |
| 1477 | wrap_here (" "); |
| 1478 | if (sal.symtab) |
| 1479 | printf_filtered (" (%s:%d)", symtab_to_filename_for_display (sal.symtab), |
| 1480 | sal.line); |
| 1481 | puts_filtered ("; "); |
| 1482 | wrap_here (" "); |
| 1483 | printf_filtered ("saved %s = ", pc_regname); |
| 1484 | |
| 1485 | if (!frame_id_p (frame_unwind_caller_id (fi))) |
| 1486 | val_print_not_saved (gdb_stdout); |
| 1487 | else |
| 1488 | { |
| 1489 | TRY |
| 1490 | { |
| 1491 | caller_pc = frame_unwind_caller_pc (fi); |
| 1492 | caller_pc_p = 1; |
| 1493 | } |
| 1494 | CATCH (ex, RETURN_MASK_ERROR) |
| 1495 | { |
| 1496 | switch (ex.error) |
| 1497 | { |
| 1498 | case NOT_AVAILABLE_ERROR: |
| 1499 | val_print_unavailable (gdb_stdout); |
| 1500 | break; |
| 1501 | case OPTIMIZED_OUT_ERROR: |
| 1502 | val_print_not_saved (gdb_stdout); |
| 1503 | break; |
| 1504 | default: |
| 1505 | fprintf_filtered (gdb_stdout, _("<error: %s>"), ex.message); |
| 1506 | break; |
| 1507 | } |
| 1508 | } |
| 1509 | END_CATCH |
| 1510 | } |
| 1511 | |
| 1512 | if (caller_pc_p) |
| 1513 | fputs_filtered (paddress (gdbarch, caller_pc), gdb_stdout); |
| 1514 | printf_filtered ("\n"); |
| 1515 | |
| 1516 | if (calling_frame_info == NULL) |
| 1517 | { |
| 1518 | enum unwind_stop_reason reason; |
| 1519 | |
| 1520 | reason = get_frame_unwind_stop_reason (fi); |
| 1521 | if (reason != UNWIND_NO_REASON) |
| 1522 | printf_filtered (_(" Outermost frame: %s\n"), |
| 1523 | frame_stop_reason_string (fi)); |
| 1524 | } |
| 1525 | else if (get_frame_type (fi) == TAILCALL_FRAME) |
| 1526 | puts_filtered (" tail call frame"); |
| 1527 | else if (get_frame_type (fi) == INLINE_FRAME) |
| 1528 | printf_filtered (" inlined into frame %d", |
| 1529 | frame_relative_level (get_prev_frame (fi))); |
| 1530 | else |
| 1531 | { |
| 1532 | printf_filtered (" called by frame at "); |
| 1533 | fputs_filtered (paddress (gdbarch, get_frame_base (calling_frame_info)), |
| 1534 | gdb_stdout); |
| 1535 | } |
| 1536 | if (get_next_frame (fi) && calling_frame_info) |
| 1537 | puts_filtered (","); |
| 1538 | wrap_here (" "); |
| 1539 | if (get_next_frame (fi)) |
| 1540 | { |
| 1541 | printf_filtered (" caller of frame at "); |
| 1542 | fputs_filtered (paddress (gdbarch, get_frame_base (get_next_frame (fi))), |
| 1543 | gdb_stdout); |
| 1544 | } |
| 1545 | if (get_next_frame (fi) || calling_frame_info) |
| 1546 | puts_filtered ("\n"); |
| 1547 | |
| 1548 | if (s) |
| 1549 | printf_filtered (" source language %s.\n", |
| 1550 | language_str (s->language)); |
| 1551 | |
| 1552 | { |
| 1553 | /* Address of the argument list for this frame, or 0. */ |
| 1554 | CORE_ADDR arg_list = get_frame_args_address (fi); |
| 1555 | /* Number of args for this frame, or -1 if unknown. */ |
| 1556 | int numargs; |
| 1557 | |
| 1558 | if (arg_list == 0) |
| 1559 | printf_filtered (" Arglist at unknown address.\n"); |
| 1560 | else |
| 1561 | { |
| 1562 | printf_filtered (" Arglist at "); |
| 1563 | fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout); |
| 1564 | printf_filtered (","); |
| 1565 | |
| 1566 | if (!gdbarch_frame_num_args_p (gdbarch)) |
| 1567 | { |
| 1568 | numargs = -1; |
| 1569 | puts_filtered (" args: "); |
| 1570 | } |
| 1571 | else |
| 1572 | { |
| 1573 | numargs = gdbarch_frame_num_args (gdbarch, fi); |
| 1574 | gdb_assert (numargs >= 0); |
| 1575 | if (numargs == 0) |
| 1576 | puts_filtered (" no args."); |
| 1577 | else if (numargs == 1) |
| 1578 | puts_filtered (" 1 arg: "); |
| 1579 | else |
| 1580 | printf_filtered (" %d args: ", numargs); |
| 1581 | } |
| 1582 | print_frame_args (func, fi, numargs, gdb_stdout); |
| 1583 | puts_filtered ("\n"); |
| 1584 | } |
| 1585 | } |
| 1586 | { |
| 1587 | /* Address of the local variables for this frame, or 0. */ |
| 1588 | CORE_ADDR arg_list = get_frame_locals_address (fi); |
| 1589 | |
| 1590 | if (arg_list == 0) |
| 1591 | printf_filtered (" Locals at unknown address,"); |
| 1592 | else |
| 1593 | { |
| 1594 | printf_filtered (" Locals at "); |
| 1595 | fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout); |
| 1596 | printf_filtered (","); |
| 1597 | } |
| 1598 | } |
| 1599 | |
| 1600 | /* Print as much information as possible on the location of all the |
| 1601 | registers. */ |
| 1602 | { |
| 1603 | int count; |
| 1604 | int i; |
| 1605 | int need_nl = 1; |
| 1606 | int sp_regnum = gdbarch_sp_regnum (gdbarch); |
| 1607 | |
| 1608 | /* The sp is special; what's displayed isn't the save address, but |
| 1609 | the value of the previous frame's sp. This is a legacy thing, |
| 1610 | at one stage the frame cached the previous frame's SP instead |
| 1611 | of its address, hence it was easiest to just display the cached |
| 1612 | value. */ |
| 1613 | if (sp_regnum >= 0) |
| 1614 | { |
| 1615 | struct value *value = frame_unwind_register_value (fi, sp_regnum); |
| 1616 | gdb_assert (value != NULL); |
| 1617 | |
| 1618 | if (!value_optimized_out (value) && value_entirely_available (value)) |
| 1619 | { |
| 1620 | if (VALUE_LVAL (value) == not_lval) |
| 1621 | { |
| 1622 | CORE_ADDR sp; |
| 1623 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1624 | int sp_size = register_size (gdbarch, sp_regnum); |
| 1625 | |
| 1626 | sp = extract_unsigned_integer (value_contents_all (value), |
| 1627 | sp_size, byte_order); |
| 1628 | |
| 1629 | printf_filtered (" Previous frame's sp is "); |
| 1630 | fputs_filtered (paddress (gdbarch, sp), gdb_stdout); |
| 1631 | printf_filtered ("\n"); |
| 1632 | } |
| 1633 | else if (VALUE_LVAL (value) == lval_memory) |
| 1634 | { |
| 1635 | printf_filtered (" Previous frame's sp at "); |
| 1636 | fputs_filtered (paddress (gdbarch, value_address (value)), |
| 1637 | gdb_stdout); |
| 1638 | printf_filtered ("\n"); |
| 1639 | } |
| 1640 | else if (VALUE_LVAL (value) == lval_register) |
| 1641 | { |
| 1642 | printf_filtered (" Previous frame's sp in %s\n", |
| 1643 | gdbarch_register_name (gdbarch, |
| 1644 | VALUE_REGNUM (value))); |
| 1645 | } |
| 1646 | |
| 1647 | release_value (value); |
| 1648 | value_free (value); |
| 1649 | need_nl = 0; |
| 1650 | } |
| 1651 | /* else keep quiet. */ |
| 1652 | } |
| 1653 | |
| 1654 | count = 0; |
| 1655 | numregs = gdbarch_num_regs (gdbarch) |
| 1656 | + gdbarch_num_pseudo_regs (gdbarch); |
| 1657 | for (i = 0; i < numregs; i++) |
| 1658 | if (i != sp_regnum |
| 1659 | && gdbarch_register_reggroup_p (gdbarch, i, all_reggroup)) |
| 1660 | { |
| 1661 | enum lval_type lval; |
| 1662 | int optimized; |
| 1663 | int unavailable; |
| 1664 | CORE_ADDR addr; |
| 1665 | int realnum; |
| 1666 | |
| 1667 | /* Find out the location of the saved register without |
| 1668 | fetching the corresponding value. */ |
| 1669 | frame_register_unwind (fi, i, &optimized, &unavailable, |
| 1670 | &lval, &addr, &realnum, NULL); |
| 1671 | /* For moment, only display registers that were saved on the |
| 1672 | stack. */ |
| 1673 | if (!optimized && !unavailable && lval == lval_memory) |
| 1674 | { |
| 1675 | if (count == 0) |
| 1676 | puts_filtered (" Saved registers:\n "); |
| 1677 | else |
| 1678 | puts_filtered (","); |
| 1679 | wrap_here (" "); |
| 1680 | printf_filtered (" %s at ", |
| 1681 | gdbarch_register_name (gdbarch, i)); |
| 1682 | fputs_filtered (paddress (gdbarch, addr), gdb_stdout); |
| 1683 | count++; |
| 1684 | } |
| 1685 | } |
| 1686 | if (count || need_nl) |
| 1687 | puts_filtered ("\n"); |
| 1688 | } |
| 1689 | } |
| 1690 | |
| 1691 | /* Print briefly all stack frames or just the innermost COUNT_EXP |
| 1692 | frames. */ |
| 1693 | |
| 1694 | static void |
| 1695 | backtrace_command_1 (char *count_exp, int show_locals, int no_filters, |
| 1696 | int from_tty) |
| 1697 | { |
| 1698 | struct frame_info *fi; |
| 1699 | int count; |
| 1700 | int i; |
| 1701 | struct frame_info *trailing; |
| 1702 | int trailing_level, py_start = 0, py_end = 0; |
| 1703 | enum ext_lang_bt_status result = EXT_LANG_BT_ERROR; |
| 1704 | |
| 1705 | if (!target_has_stack) |
| 1706 | error (_("No stack.")); |
| 1707 | |
| 1708 | /* The following code must do two things. First, it must set the |
| 1709 | variable TRAILING to the frame from which we should start |
| 1710 | printing. Second, it must set the variable count to the number |
| 1711 | of frames which we should print, or -1 if all of them. */ |
| 1712 | trailing = get_current_frame (); |
| 1713 | |
| 1714 | trailing_level = 0; |
| 1715 | if (count_exp) |
| 1716 | { |
| 1717 | count = parse_and_eval_long (count_exp); |
| 1718 | if (count < 0) |
| 1719 | { |
| 1720 | struct frame_info *current; |
| 1721 | |
| 1722 | py_start = count; |
| 1723 | count = -count; |
| 1724 | |
| 1725 | current = trailing; |
| 1726 | while (current && count--) |
| 1727 | { |
| 1728 | QUIT; |
| 1729 | current = get_prev_frame (current); |
| 1730 | } |
| 1731 | |
| 1732 | /* Will stop when CURRENT reaches the top of the stack. |
| 1733 | TRAILING will be COUNT below it. */ |
| 1734 | while (current) |
| 1735 | { |
| 1736 | QUIT; |
| 1737 | trailing = get_prev_frame (trailing); |
| 1738 | current = get_prev_frame (current); |
| 1739 | trailing_level++; |
| 1740 | } |
| 1741 | |
| 1742 | count = -1; |
| 1743 | } |
| 1744 | else |
| 1745 | { |
| 1746 | py_start = 0; |
| 1747 | py_end = count; |
| 1748 | } |
| 1749 | } |
| 1750 | else |
| 1751 | { |
| 1752 | py_end = -1; |
| 1753 | count = -1; |
| 1754 | } |
| 1755 | |
| 1756 | if (info_verbose) |
| 1757 | { |
| 1758 | /* Read in symbols for all of the frames. Need to do this in a |
| 1759 | separate pass so that "Reading in symbols for xxx" messages |
| 1760 | don't screw up the appearance of the backtrace. Also if |
| 1761 | people have strong opinions against reading symbols for |
| 1762 | backtrace this may have to be an option. */ |
| 1763 | i = count; |
| 1764 | for (fi = trailing; fi != NULL && i--; fi = get_prev_frame (fi)) |
| 1765 | { |
| 1766 | CORE_ADDR pc; |
| 1767 | |
| 1768 | QUIT; |
| 1769 | pc = get_frame_address_in_block (fi); |
| 1770 | expand_symtab_containing_pc (pc, find_pc_mapped_section (pc)); |
| 1771 | } |
| 1772 | } |
| 1773 | |
| 1774 | if (! no_filters) |
| 1775 | { |
| 1776 | int flags = PRINT_LEVEL | PRINT_FRAME_INFO | PRINT_ARGS; |
| 1777 | enum ext_lang_frame_args arg_type; |
| 1778 | |
| 1779 | if (show_locals) |
| 1780 | flags |= PRINT_LOCALS; |
| 1781 | |
| 1782 | if (!strcmp (print_frame_arguments, "scalars")) |
| 1783 | arg_type = CLI_SCALAR_VALUES; |
| 1784 | else if (!strcmp (print_frame_arguments, "all")) |
| 1785 | arg_type = CLI_ALL_VALUES; |
| 1786 | else |
| 1787 | arg_type = NO_VALUES; |
| 1788 | |
| 1789 | result = apply_ext_lang_frame_filter (get_current_frame (), flags, |
| 1790 | arg_type, current_uiout, |
| 1791 | py_start, py_end); |
| 1792 | } |
| 1793 | |
| 1794 | /* Run the inbuilt backtrace if there are no filters registered, or |
| 1795 | "no-filters" has been specified from the command. */ |
| 1796 | if (no_filters || result == EXT_LANG_BT_NO_FILTERS) |
| 1797 | { |
| 1798 | for (i = 0, fi = trailing; fi && count--; i++, fi = get_prev_frame (fi)) |
| 1799 | { |
| 1800 | QUIT; |
| 1801 | |
| 1802 | /* Don't use print_stack_frame; if an error() occurs it probably |
| 1803 | means further attempts to backtrace would fail (on the other |
| 1804 | hand, perhaps the code does or could be fixed to make sure |
| 1805 | the frame->prev field gets set to NULL in that case). */ |
| 1806 | |
| 1807 | print_frame_info (fi, 1, LOCATION, 1, 0); |
| 1808 | if (show_locals) |
| 1809 | { |
| 1810 | struct frame_id frame_id = get_frame_id (fi); |
| 1811 | |
| 1812 | print_frame_local_vars (fi, 1, gdb_stdout); |
| 1813 | |
| 1814 | /* print_frame_local_vars invalidates FI. */ |
| 1815 | fi = frame_find_by_id (frame_id); |
| 1816 | if (fi == NULL) |
| 1817 | { |
| 1818 | trailing = NULL; |
| 1819 | warning (_("Unable to restore previously selected frame.")); |
| 1820 | break; |
| 1821 | } |
| 1822 | } |
| 1823 | |
| 1824 | /* Save the last frame to check for error conditions. */ |
| 1825 | trailing = fi; |
| 1826 | } |
| 1827 | |
| 1828 | /* If we've stopped before the end, mention that. */ |
| 1829 | if (fi && from_tty) |
| 1830 | printf_filtered (_("(More stack frames follow...)\n")); |
| 1831 | |
| 1832 | /* If we've run out of frames, and the reason appears to be an error |
| 1833 | condition, print it. */ |
| 1834 | if (fi == NULL && trailing != NULL) |
| 1835 | { |
| 1836 | enum unwind_stop_reason reason; |
| 1837 | |
| 1838 | reason = get_frame_unwind_stop_reason (trailing); |
| 1839 | if (reason >= UNWIND_FIRST_ERROR) |
| 1840 | printf_filtered (_("Backtrace stopped: %s\n"), |
| 1841 | frame_stop_reason_string (trailing)); |
| 1842 | } |
| 1843 | } |
| 1844 | } |
| 1845 | |
| 1846 | static void |
| 1847 | backtrace_command (char *arg, int from_tty) |
| 1848 | { |
| 1849 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
| 1850 | int fulltrace_arg = -1, arglen = 0, argc = 0, no_filters = -1; |
| 1851 | int user_arg = 0; |
| 1852 | |
| 1853 | if (arg) |
| 1854 | { |
| 1855 | char **argv; |
| 1856 | int i; |
| 1857 | |
| 1858 | gdb_argv built_argv (arg); |
| 1859 | argv = built_argv.get (); |
| 1860 | argc = 0; |
| 1861 | for (i = 0; argv[i]; i++) |
| 1862 | { |
| 1863 | unsigned int j; |
| 1864 | |
| 1865 | for (j = 0; j < strlen (argv[i]); j++) |
| 1866 | argv[i][j] = TOLOWER (argv[i][j]); |
| 1867 | |
| 1868 | if (no_filters < 0 && subset_compare (argv[i], "no-filters")) |
| 1869 | no_filters = argc; |
| 1870 | else |
| 1871 | { |
| 1872 | if (fulltrace_arg < 0 && subset_compare (argv[i], "full")) |
| 1873 | fulltrace_arg = argc; |
| 1874 | else |
| 1875 | { |
| 1876 | user_arg++; |
| 1877 | arglen += strlen (argv[i]); |
| 1878 | } |
| 1879 | } |
| 1880 | argc++; |
| 1881 | } |
| 1882 | arglen += user_arg; |
| 1883 | if (fulltrace_arg >= 0 || no_filters >= 0) |
| 1884 | { |
| 1885 | if (arglen > 0) |
| 1886 | { |
| 1887 | arg = (char *) xmalloc (arglen + 1); |
| 1888 | make_cleanup (xfree, arg); |
| 1889 | arg[0] = 0; |
| 1890 | for (i = 0; i < argc; i++) |
| 1891 | { |
| 1892 | if (i != fulltrace_arg && i != no_filters) |
| 1893 | { |
| 1894 | strcat (arg, argv[i]); |
| 1895 | strcat (arg, " "); |
| 1896 | } |
| 1897 | } |
| 1898 | } |
| 1899 | else |
| 1900 | arg = NULL; |
| 1901 | } |
| 1902 | } |
| 1903 | |
| 1904 | backtrace_command_1 (arg, fulltrace_arg >= 0 /* show_locals */, |
| 1905 | no_filters >= 0 /* no frame-filters */, from_tty); |
| 1906 | |
| 1907 | do_cleanups (old_chain); |
| 1908 | } |
| 1909 | |
| 1910 | /* Iterate over the local variables of a block B, calling CB with |
| 1911 | CB_DATA. */ |
| 1912 | |
| 1913 | static void |
| 1914 | iterate_over_block_locals (const struct block *b, |
| 1915 | iterate_over_block_arg_local_vars_cb cb, |
| 1916 | void *cb_data) |
| 1917 | { |
| 1918 | struct block_iterator iter; |
| 1919 | struct symbol *sym; |
| 1920 | |
| 1921 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 1922 | { |
| 1923 | switch (SYMBOL_CLASS (sym)) |
| 1924 | { |
| 1925 | case LOC_LOCAL: |
| 1926 | case LOC_REGISTER: |
| 1927 | case LOC_STATIC: |
| 1928 | case LOC_COMPUTED: |
| 1929 | if (SYMBOL_IS_ARGUMENT (sym)) |
| 1930 | break; |
| 1931 | if (SYMBOL_DOMAIN (sym) == COMMON_BLOCK_DOMAIN) |
| 1932 | break; |
| 1933 | (*cb) (SYMBOL_PRINT_NAME (sym), sym, cb_data); |
| 1934 | break; |
| 1935 | |
| 1936 | default: |
| 1937 | /* Ignore symbols which are not locals. */ |
| 1938 | break; |
| 1939 | } |
| 1940 | } |
| 1941 | } |
| 1942 | |
| 1943 | |
| 1944 | /* Same, but print labels. */ |
| 1945 | |
| 1946 | #if 0 |
| 1947 | /* Commented out, as the code using this function has also been |
| 1948 | commented out. FIXME:brobecker/2009-01-13: Find out why the code |
| 1949 | was commented out in the first place. The discussion introducing |
| 1950 | this change (2007-12-04: Support lexical blocks and function bodies |
| 1951 | that occupy non-contiguous address ranges) did not explain why |
| 1952 | this change was made. */ |
| 1953 | static int |
| 1954 | print_block_frame_labels (struct gdbarch *gdbarch, struct block *b, |
| 1955 | int *have_default, struct ui_file *stream) |
| 1956 | { |
| 1957 | struct block_iterator iter; |
| 1958 | struct symbol *sym; |
| 1959 | int values_printed = 0; |
| 1960 | |
| 1961 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 1962 | { |
| 1963 | if (strcmp (SYMBOL_LINKAGE_NAME (sym), "default") == 0) |
| 1964 | { |
| 1965 | if (*have_default) |
| 1966 | continue; |
| 1967 | *have_default = 1; |
| 1968 | } |
| 1969 | if (SYMBOL_CLASS (sym) == LOC_LABEL) |
| 1970 | { |
| 1971 | struct symtab_and_line sal; |
| 1972 | struct value_print_options opts; |
| 1973 | |
| 1974 | sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0); |
| 1975 | values_printed = 1; |
| 1976 | fputs_filtered (SYMBOL_PRINT_NAME (sym), stream); |
| 1977 | get_user_print_options (&opts); |
| 1978 | if (opts.addressprint) |
| 1979 | { |
| 1980 | fprintf_filtered (stream, " "); |
| 1981 | fputs_filtered (paddress (gdbarch, SYMBOL_VALUE_ADDRESS (sym)), |
| 1982 | stream); |
| 1983 | } |
| 1984 | fprintf_filtered (stream, " in file %s, line %d\n", |
| 1985 | sal.symtab->filename, sal.line); |
| 1986 | } |
| 1987 | } |
| 1988 | |
| 1989 | return values_printed; |
| 1990 | } |
| 1991 | #endif |
| 1992 | |
| 1993 | /* Iterate over all the local variables in block B, including all its |
| 1994 | superblocks, stopping when the top-level block is reached. */ |
| 1995 | |
| 1996 | void |
| 1997 | iterate_over_block_local_vars (const struct block *block, |
| 1998 | iterate_over_block_arg_local_vars_cb cb, |
| 1999 | void *cb_data) |
| 2000 | { |
| 2001 | while (block) |
| 2002 | { |
| 2003 | iterate_over_block_locals (block, cb, cb_data); |
| 2004 | /* After handling the function's top-level block, stop. Don't |
| 2005 | continue to its superblock, the block of per-file |
| 2006 | symbols. */ |
| 2007 | if (BLOCK_FUNCTION (block)) |
| 2008 | break; |
| 2009 | block = BLOCK_SUPERBLOCK (block); |
| 2010 | } |
| 2011 | } |
| 2012 | |
| 2013 | /* Data to be passed around in the calls to the locals and args |
| 2014 | iterators. */ |
| 2015 | |
| 2016 | struct print_variable_and_value_data |
| 2017 | { |
| 2018 | struct frame_id frame_id; |
| 2019 | int num_tabs; |
| 2020 | struct ui_file *stream; |
| 2021 | int values_printed; |
| 2022 | }; |
| 2023 | |
| 2024 | /* The callback for the locals and args iterators. */ |
| 2025 | |
| 2026 | static void |
| 2027 | do_print_variable_and_value (const char *print_name, |
| 2028 | struct symbol *sym, |
| 2029 | void *cb_data) |
| 2030 | { |
| 2031 | struct print_variable_and_value_data *p |
| 2032 | = (struct print_variable_and_value_data *) cb_data; |
| 2033 | struct frame_info *frame; |
| 2034 | |
| 2035 | frame = frame_find_by_id (p->frame_id); |
| 2036 | if (frame == NULL) |
| 2037 | { |
| 2038 | warning (_("Unable to restore previously selected frame.")); |
| 2039 | return; |
| 2040 | } |
| 2041 | |
| 2042 | print_variable_and_value (print_name, sym, frame, p->stream, p->num_tabs); |
| 2043 | |
| 2044 | /* print_variable_and_value invalidates FRAME. */ |
| 2045 | frame = NULL; |
| 2046 | |
| 2047 | p->values_printed = 1; |
| 2048 | } |
| 2049 | |
| 2050 | /* Print all variables from the innermost up to the function block of FRAME. |
| 2051 | Print them with values to STREAM indented by NUM_TABS. |
| 2052 | |
| 2053 | This function will invalidate FRAME. */ |
| 2054 | |
| 2055 | static void |
| 2056 | print_frame_local_vars (struct frame_info *frame, int num_tabs, |
| 2057 | struct ui_file *stream) |
| 2058 | { |
| 2059 | struct print_variable_and_value_data cb_data; |
| 2060 | const struct block *block; |
| 2061 | CORE_ADDR pc; |
| 2062 | struct gdb_exception except = exception_none; |
| 2063 | |
| 2064 | if (!get_frame_pc_if_available (frame, &pc)) |
| 2065 | { |
| 2066 | fprintf_filtered (stream, |
| 2067 | _("PC unavailable, cannot determine locals.\n")); |
| 2068 | return; |
| 2069 | } |
| 2070 | |
| 2071 | block = get_frame_block (frame, 0); |
| 2072 | if (block == 0) |
| 2073 | { |
| 2074 | fprintf_filtered (stream, "No symbol table info available.\n"); |
| 2075 | return; |
| 2076 | } |
| 2077 | |
| 2078 | cb_data.frame_id = get_frame_id (frame); |
| 2079 | cb_data.num_tabs = 4 * num_tabs; |
| 2080 | cb_data.stream = stream; |
| 2081 | cb_data.values_printed = 0; |
| 2082 | |
| 2083 | /* Temporarily change the selected frame to the given FRAME. |
| 2084 | This allows routines that rely on the selected frame instead |
| 2085 | of being given a frame as parameter to use the correct frame. */ |
| 2086 | select_frame (frame); |
| 2087 | |
| 2088 | TRY |
| 2089 | { |
| 2090 | iterate_over_block_local_vars (block, |
| 2091 | do_print_variable_and_value, |
| 2092 | &cb_data); |
| 2093 | } |
| 2094 | CATCH (ex, RETURN_MASK_ALL) |
| 2095 | { |
| 2096 | except = ex; |
| 2097 | } |
| 2098 | END_CATCH |
| 2099 | |
| 2100 | /* Restore the selected frame, and then rethrow if there was a problem. */ |
| 2101 | select_frame (frame_find_by_id (cb_data.frame_id)); |
| 2102 | if (except.reason < 0) |
| 2103 | throw_exception (except); |
| 2104 | |
| 2105 | /* do_print_variable_and_value invalidates FRAME. */ |
| 2106 | frame = NULL; |
| 2107 | |
| 2108 | if (!cb_data.values_printed) |
| 2109 | fprintf_filtered (stream, _("No locals.\n")); |
| 2110 | } |
| 2111 | |
| 2112 | void |
| 2113 | info_locals_command (char *args, int from_tty) |
| 2114 | { |
| 2115 | print_frame_local_vars (get_selected_frame (_("No frame selected.")), |
| 2116 | 0, gdb_stdout); |
| 2117 | } |
| 2118 | |
| 2119 | /* Iterate over all the argument variables in block B. |
| 2120 | |
| 2121 | Returns 1 if any argument was walked; 0 otherwise. */ |
| 2122 | |
| 2123 | void |
| 2124 | iterate_over_block_arg_vars (const struct block *b, |
| 2125 | iterate_over_block_arg_local_vars_cb cb, |
| 2126 | void *cb_data) |
| 2127 | { |
| 2128 | struct block_iterator iter; |
| 2129 | struct symbol *sym, *sym2; |
| 2130 | |
| 2131 | ALL_BLOCK_SYMBOLS (b, iter, sym) |
| 2132 | { |
| 2133 | /* Don't worry about things which aren't arguments. */ |
| 2134 | if (SYMBOL_IS_ARGUMENT (sym)) |
| 2135 | { |
| 2136 | /* We have to look up the symbol because arguments can have |
| 2137 | two entries (one a parameter, one a local) and the one we |
| 2138 | want is the local, which lookup_symbol will find for us. |
| 2139 | This includes gcc1 (not gcc2) on the sparc when passing a |
| 2140 | small structure and gcc2 when the argument type is float |
| 2141 | and it is passed as a double and converted to float by |
| 2142 | the prologue (in the latter case the type of the LOC_ARG |
| 2143 | symbol is double and the type of the LOC_LOCAL symbol is |
| 2144 | float). There are also LOC_ARG/LOC_REGISTER pairs which |
| 2145 | are not combined in symbol-reading. */ |
| 2146 | |
| 2147 | sym2 = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), |
| 2148 | b, VAR_DOMAIN, NULL).symbol; |
| 2149 | (*cb) (SYMBOL_PRINT_NAME (sym), sym2, cb_data); |
| 2150 | } |
| 2151 | } |
| 2152 | } |
| 2153 | |
| 2154 | /* Print all argument variables of the function of FRAME. |
| 2155 | Print them with values to STREAM. |
| 2156 | |
| 2157 | This function will invalidate FRAME. */ |
| 2158 | |
| 2159 | static void |
| 2160 | print_frame_arg_vars (struct frame_info *frame, struct ui_file *stream) |
| 2161 | { |
| 2162 | struct print_variable_and_value_data cb_data; |
| 2163 | struct symbol *func; |
| 2164 | CORE_ADDR pc; |
| 2165 | |
| 2166 | if (!get_frame_pc_if_available (frame, &pc)) |
| 2167 | { |
| 2168 | fprintf_filtered (stream, _("PC unavailable, cannot determine args.\n")); |
| 2169 | return; |
| 2170 | } |
| 2171 | |
| 2172 | func = get_frame_function (frame); |
| 2173 | if (func == NULL) |
| 2174 | { |
| 2175 | fprintf_filtered (stream, _("No symbol table info available.\n")); |
| 2176 | return; |
| 2177 | } |
| 2178 | |
| 2179 | cb_data.frame_id = get_frame_id (frame); |
| 2180 | cb_data.num_tabs = 0; |
| 2181 | cb_data.stream = gdb_stdout; |
| 2182 | cb_data.values_printed = 0; |
| 2183 | |
| 2184 | iterate_over_block_arg_vars (SYMBOL_BLOCK_VALUE (func), |
| 2185 | do_print_variable_and_value, &cb_data); |
| 2186 | |
| 2187 | /* do_print_variable_and_value invalidates FRAME. */ |
| 2188 | frame = NULL; |
| 2189 | |
| 2190 | if (!cb_data.values_printed) |
| 2191 | fprintf_filtered (stream, _("No arguments.\n")); |
| 2192 | } |
| 2193 | |
| 2194 | void |
| 2195 | info_args_command (char *ignore, int from_tty) |
| 2196 | { |
| 2197 | print_frame_arg_vars (get_selected_frame (_("No frame selected.")), |
| 2198 | gdb_stdout); |
| 2199 | } |
| 2200 | |
| 2201 | /* Select frame FRAME. Also print the stack frame and show the source |
| 2202 | if this is the tui version. */ |
| 2203 | static void |
| 2204 | select_and_print_frame (struct frame_info *frame) |
| 2205 | { |
| 2206 | select_frame (frame); |
| 2207 | if (frame) |
| 2208 | print_stack_frame (frame, 1, SRC_AND_LOC, 1); |
| 2209 | } |
| 2210 | \f |
| 2211 | /* Return the symbol-block in which the selected frame is executing. |
| 2212 | Can return zero under various legitimate circumstances. |
| 2213 | |
| 2214 | If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant |
| 2215 | code address within the block returned. We use this to decide |
| 2216 | which macros are in scope. */ |
| 2217 | |
| 2218 | const struct block * |
| 2219 | get_selected_block (CORE_ADDR *addr_in_block) |
| 2220 | { |
| 2221 | if (!has_stack_frames ()) |
| 2222 | return 0; |
| 2223 | |
| 2224 | return get_frame_block (get_selected_frame (NULL), addr_in_block); |
| 2225 | } |
| 2226 | |
| 2227 | /* Find a frame a certain number of levels away from FRAME. |
| 2228 | LEVEL_OFFSET_PTR points to an int containing the number of levels. |
| 2229 | Positive means go to earlier frames (up); negative, the reverse. |
| 2230 | The int that contains the number of levels is counted toward |
| 2231 | zero as the frames for those levels are found. |
| 2232 | If the top or bottom frame is reached, that frame is returned, |
| 2233 | but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates |
| 2234 | how much farther the original request asked to go. */ |
| 2235 | |
| 2236 | struct frame_info * |
| 2237 | find_relative_frame (struct frame_info *frame, int *level_offset_ptr) |
| 2238 | { |
| 2239 | /* Going up is simple: just call get_prev_frame enough times or |
| 2240 | until the initial frame is reached. */ |
| 2241 | while (*level_offset_ptr > 0) |
| 2242 | { |
| 2243 | struct frame_info *prev = get_prev_frame (frame); |
| 2244 | |
| 2245 | if (!prev) |
| 2246 | break; |
| 2247 | (*level_offset_ptr)--; |
| 2248 | frame = prev; |
| 2249 | } |
| 2250 | |
| 2251 | /* Going down is just as simple. */ |
| 2252 | while (*level_offset_ptr < 0) |
| 2253 | { |
| 2254 | struct frame_info *next = get_next_frame (frame); |
| 2255 | |
| 2256 | if (!next) |
| 2257 | break; |
| 2258 | (*level_offset_ptr)++; |
| 2259 | frame = next; |
| 2260 | } |
| 2261 | |
| 2262 | return frame; |
| 2263 | } |
| 2264 | |
| 2265 | /* The "select_frame" command. With no argument this is a NOP. |
| 2266 | Select the frame at level LEVEL_EXP if it is a valid level. |
| 2267 | Otherwise, treat LEVEL_EXP as an address expression and select it. |
| 2268 | |
| 2269 | See parse_frame_specification for more info on proper frame |
| 2270 | expressions. */ |
| 2271 | |
| 2272 | void |
| 2273 | select_frame_command (char *level_exp, int from_tty) |
| 2274 | { |
| 2275 | struct frame_info *prev_frame = get_selected_frame_if_set (); |
| 2276 | |
| 2277 | select_frame (parse_frame_specification (level_exp, NULL)); |
| 2278 | if (get_selected_frame_if_set () != prev_frame) |
| 2279 | observer_notify_user_selected_context_changed (USER_SELECTED_FRAME); |
| 2280 | } |
| 2281 | |
| 2282 | /* The "frame" command. With no argument, print the selected frame |
| 2283 | briefly. With an argument, behave like select_frame and then print |
| 2284 | the selected frame. */ |
| 2285 | |
| 2286 | static void |
| 2287 | frame_command (char *level_exp, int from_tty) |
| 2288 | { |
| 2289 | struct frame_info *prev_frame = get_selected_frame_if_set (); |
| 2290 | |
| 2291 | select_frame (parse_frame_specification (level_exp, NULL)); |
| 2292 | if (get_selected_frame_if_set () != prev_frame) |
| 2293 | observer_notify_user_selected_context_changed (USER_SELECTED_FRAME); |
| 2294 | else |
| 2295 | print_selected_thread_frame (current_uiout, USER_SELECTED_FRAME); |
| 2296 | } |
| 2297 | |
| 2298 | /* Select the frame up one or COUNT_EXP stack levels from the |
| 2299 | previously selected frame, and print it briefly. */ |
| 2300 | |
| 2301 | static void |
| 2302 | up_silently_base (const char *count_exp) |
| 2303 | { |
| 2304 | struct frame_info *frame; |
| 2305 | int count = 1; |
| 2306 | |
| 2307 | if (count_exp) |
| 2308 | count = parse_and_eval_long (count_exp); |
| 2309 | |
| 2310 | frame = find_relative_frame (get_selected_frame ("No stack."), &count); |
| 2311 | if (count != 0 && count_exp == NULL) |
| 2312 | error (_("Initial frame selected; you cannot go up.")); |
| 2313 | select_frame (frame); |
| 2314 | } |
| 2315 | |
| 2316 | static void |
| 2317 | up_silently_command (char *count_exp, int from_tty) |
| 2318 | { |
| 2319 | up_silently_base (count_exp); |
| 2320 | } |
| 2321 | |
| 2322 | static void |
| 2323 | up_command (char *count_exp, int from_tty) |
| 2324 | { |
| 2325 | up_silently_base (count_exp); |
| 2326 | observer_notify_user_selected_context_changed (USER_SELECTED_FRAME); |
| 2327 | } |
| 2328 | |
| 2329 | /* Select the frame down one or COUNT_EXP stack levels from the previously |
| 2330 | selected frame, and print it briefly. */ |
| 2331 | |
| 2332 | static void |
| 2333 | down_silently_base (const char *count_exp) |
| 2334 | { |
| 2335 | struct frame_info *frame; |
| 2336 | int count = -1; |
| 2337 | |
| 2338 | if (count_exp) |
| 2339 | count = -parse_and_eval_long (count_exp); |
| 2340 | |
| 2341 | frame = find_relative_frame (get_selected_frame ("No stack."), &count); |
| 2342 | if (count != 0 && count_exp == NULL) |
| 2343 | { |
| 2344 | /* We only do this if COUNT_EXP is not specified. That way |
| 2345 | "down" means to really go down (and let me know if that is |
| 2346 | impossible), but "down 9999" can be used to mean go all the |
| 2347 | way down without getting an error. */ |
| 2348 | |
| 2349 | error (_("Bottom (innermost) frame selected; you cannot go down.")); |
| 2350 | } |
| 2351 | |
| 2352 | select_frame (frame); |
| 2353 | } |
| 2354 | |
| 2355 | static void |
| 2356 | down_silently_command (char *count_exp, int from_tty) |
| 2357 | { |
| 2358 | down_silently_base (count_exp); |
| 2359 | } |
| 2360 | |
| 2361 | static void |
| 2362 | down_command (char *count_exp, int from_tty) |
| 2363 | { |
| 2364 | down_silently_base (count_exp); |
| 2365 | observer_notify_user_selected_context_changed (USER_SELECTED_FRAME); |
| 2366 | } |
| 2367 | |
| 2368 | void |
| 2369 | return_command (char *retval_exp, int from_tty) |
| 2370 | { |
| 2371 | /* Initialize it just to avoid a GCC false warning. */ |
| 2372 | enum return_value_convention rv_conv = RETURN_VALUE_STRUCT_CONVENTION; |
| 2373 | struct frame_info *thisframe; |
| 2374 | struct gdbarch *gdbarch; |
| 2375 | struct symbol *thisfun; |
| 2376 | struct value *return_value = NULL; |
| 2377 | struct value *function = NULL; |
| 2378 | const char *query_prefix = ""; |
| 2379 | |
| 2380 | thisframe = get_selected_frame ("No selected frame."); |
| 2381 | thisfun = get_frame_function (thisframe); |
| 2382 | gdbarch = get_frame_arch (thisframe); |
| 2383 | |
| 2384 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME) |
| 2385 | error (_("Can not force return from an inlined function.")); |
| 2386 | |
| 2387 | /* Compute the return value. If the computation triggers an error, |
| 2388 | let it bail. If the return type can't be handled, set |
| 2389 | RETURN_VALUE to NULL, and QUERY_PREFIX to an informational |
| 2390 | message. */ |
| 2391 | if (retval_exp) |
| 2392 | { |
| 2393 | expression_up retval_expr = parse_expression (retval_exp); |
| 2394 | struct type *return_type = NULL; |
| 2395 | |
| 2396 | /* Compute the return value. Should the computation fail, this |
| 2397 | call throws an error. */ |
| 2398 | return_value = evaluate_expression (retval_expr.get ()); |
| 2399 | |
| 2400 | /* Cast return value to the return type of the function. Should |
| 2401 | the cast fail, this call throws an error. */ |
| 2402 | if (thisfun != NULL) |
| 2403 | return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun)); |
| 2404 | if (return_type == NULL) |
| 2405 | { |
| 2406 | if (retval_expr->elts[0].opcode != UNOP_CAST |
| 2407 | && retval_expr->elts[0].opcode != UNOP_CAST_TYPE) |
| 2408 | error (_("Return value type not available for selected " |
| 2409 | "stack frame.\n" |
| 2410 | "Please use an explicit cast of the value to return.")); |
| 2411 | return_type = value_type (return_value); |
| 2412 | } |
| 2413 | return_type = check_typedef (return_type); |
| 2414 | return_value = value_cast (return_type, return_value); |
| 2415 | |
| 2416 | /* Make sure the value is fully evaluated. It may live in the |
| 2417 | stack frame we're about to pop. */ |
| 2418 | if (value_lazy (return_value)) |
| 2419 | value_fetch_lazy (return_value); |
| 2420 | |
| 2421 | if (thisfun != NULL) |
| 2422 | function = read_var_value (thisfun, NULL, thisframe); |
| 2423 | |
| 2424 | rv_conv = RETURN_VALUE_REGISTER_CONVENTION; |
| 2425 | if (TYPE_CODE (return_type) == TYPE_CODE_VOID) |
| 2426 | /* If the return-type is "void", don't try to find the |
| 2427 | return-value's location. However, do still evaluate the |
| 2428 | return expression so that, even when the expression result |
| 2429 | is discarded, side effects such as "return i++" still |
| 2430 | occur. */ |
| 2431 | return_value = NULL; |
| 2432 | else if (thisfun != NULL) |
| 2433 | { |
| 2434 | rv_conv = struct_return_convention (gdbarch, function, return_type); |
| 2435 | if (rv_conv == RETURN_VALUE_STRUCT_CONVENTION |
| 2436 | || rv_conv == RETURN_VALUE_ABI_RETURNS_ADDRESS) |
| 2437 | { |
| 2438 | query_prefix = "The location at which to store the " |
| 2439 | "function's return value is unknown.\n" |
| 2440 | "If you continue, the return value " |
| 2441 | "that you specified will be ignored.\n"; |
| 2442 | return_value = NULL; |
| 2443 | } |
| 2444 | } |
| 2445 | } |
| 2446 | |
| 2447 | /* Does an interactive user really want to do this? Include |
| 2448 | information, such as how well GDB can handle the return value, in |
| 2449 | the query message. */ |
| 2450 | if (from_tty) |
| 2451 | { |
| 2452 | int confirmed; |
| 2453 | |
| 2454 | if (thisfun == NULL) |
| 2455 | confirmed = query (_("%sMake selected stack frame return now? "), |
| 2456 | query_prefix); |
| 2457 | else |
| 2458 | { |
| 2459 | if (TYPE_NO_RETURN (thisfun->type)) |
| 2460 | warning (_("Function does not return normally to caller.")); |
| 2461 | confirmed = query (_("%sMake %s return now? "), query_prefix, |
| 2462 | SYMBOL_PRINT_NAME (thisfun)); |
| 2463 | } |
| 2464 | if (!confirmed) |
| 2465 | error (_("Not confirmed")); |
| 2466 | } |
| 2467 | |
| 2468 | /* Discard the selected frame and all frames inner-to it. */ |
| 2469 | frame_pop (get_selected_frame (NULL)); |
| 2470 | |
| 2471 | /* Store RETURN_VALUE in the just-returned register set. */ |
| 2472 | if (return_value != NULL) |
| 2473 | { |
| 2474 | struct type *return_type = value_type (return_value); |
| 2475 | struct gdbarch *gdbarch = get_current_regcache ()->arch (); |
| 2476 | |
| 2477 | gdb_assert (rv_conv != RETURN_VALUE_STRUCT_CONVENTION |
| 2478 | && rv_conv != RETURN_VALUE_ABI_RETURNS_ADDRESS); |
| 2479 | gdbarch_return_value (gdbarch, function, return_type, |
| 2480 | get_current_regcache (), NULL /*read*/, |
| 2481 | value_contents (return_value) /*write*/); |
| 2482 | } |
| 2483 | |
| 2484 | /* If we are at the end of a call dummy now, pop the dummy frame |
| 2485 | too. */ |
| 2486 | if (get_frame_type (get_current_frame ()) == DUMMY_FRAME) |
| 2487 | frame_pop (get_current_frame ()); |
| 2488 | |
| 2489 | select_frame (get_current_frame ()); |
| 2490 | /* If interactive, print the frame that is now current. */ |
| 2491 | if (from_tty) |
| 2492 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); |
| 2493 | } |
| 2494 | |
| 2495 | /* Sets the scope to input function name, provided that the function |
| 2496 | is within the current stack frame. */ |
| 2497 | |
| 2498 | struct function_bounds |
| 2499 | { |
| 2500 | CORE_ADDR low, high; |
| 2501 | }; |
| 2502 | |
| 2503 | static void |
| 2504 | func_command (char *arg, int from_tty) |
| 2505 | { |
| 2506 | struct frame_info *frame; |
| 2507 | int found = 0; |
| 2508 | int level = 1; |
| 2509 | |
| 2510 | if (arg == NULL) |
| 2511 | return; |
| 2512 | |
| 2513 | frame = get_current_frame (); |
| 2514 | std::vector<symtab_and_line> sals |
| 2515 | = decode_line_with_current_source (arg, DECODE_LINE_FUNFIRSTLINE); |
| 2516 | gdb::def_vector<function_bounds> func_bounds (sals.size ()); |
| 2517 | for (size_t i = 0; (i < sals.size () && !found); i++) |
| 2518 | { |
| 2519 | if (sals[i].pspace != current_program_space) |
| 2520 | func_bounds[i].low = func_bounds[i].high = 0; |
| 2521 | else if (sals[i].pc == 0 |
| 2522 | || find_pc_partial_function (sals[i].pc, NULL, |
| 2523 | &func_bounds[i].low, |
| 2524 | &func_bounds[i].high) == 0) |
| 2525 | { |
| 2526 | func_bounds[i].low = func_bounds[i].high = 0; |
| 2527 | } |
| 2528 | } |
| 2529 | |
| 2530 | do |
| 2531 | { |
| 2532 | for (size_t i = 0; (i < sals.size () && !found); i++) |
| 2533 | found = (get_frame_pc (frame) >= func_bounds[i].low |
| 2534 | && get_frame_pc (frame) < func_bounds[i].high); |
| 2535 | if (!found) |
| 2536 | { |
| 2537 | level = 1; |
| 2538 | frame = find_relative_frame (frame, &level); |
| 2539 | } |
| 2540 | } |
| 2541 | while (!found && level == 0); |
| 2542 | |
| 2543 | if (!found) |
| 2544 | printf_filtered (_("'%s' not within current stack frame.\n"), arg); |
| 2545 | else if (frame != get_selected_frame (NULL)) |
| 2546 | select_and_print_frame (frame); |
| 2547 | } |
| 2548 | |
| 2549 | void |
| 2550 | _initialize_stack (void) |
| 2551 | { |
| 2552 | add_com ("return", class_stack, return_command, _("\ |
| 2553 | Make selected stack frame return to its caller.\n\ |
| 2554 | Control remains in the debugger, but when you continue\n\ |
| 2555 | execution will resume in the frame above the one now selected.\n\ |
| 2556 | If an argument is given, it is an expression for the value to return.")); |
| 2557 | |
| 2558 | add_com ("up", class_stack, up_command, _("\ |
| 2559 | Select and print stack frame that called this one.\n\ |
| 2560 | An argument says how many frames up to go.")); |
| 2561 | add_com ("up-silently", class_support, up_silently_command, _("\ |
| 2562 | Same as the `up' command, but does not print anything.\n\ |
| 2563 | This is useful in command scripts.")); |
| 2564 | |
| 2565 | add_com ("down", class_stack, down_command, _("\ |
| 2566 | Select and print stack frame called by this one.\n\ |
| 2567 | An argument says how many frames down to go.")); |
| 2568 | add_com_alias ("do", "down", class_stack, 1); |
| 2569 | add_com_alias ("dow", "down", class_stack, 1); |
| 2570 | add_com ("down-silently", class_support, down_silently_command, _("\ |
| 2571 | Same as the `down' command, but does not print anything.\n\ |
| 2572 | This is useful in command scripts.")); |
| 2573 | |
| 2574 | add_com ("frame", class_stack, frame_command, _("\ |
| 2575 | Select and print a stack frame.\nWith no argument, \ |
| 2576 | print the selected stack frame. (See also \"info frame\").\n\ |
| 2577 | An argument specifies the frame to select.\n\ |
| 2578 | It can be a stack frame number or the address of the frame.\n")); |
| 2579 | |
| 2580 | add_com_alias ("f", "frame", class_stack, 1); |
| 2581 | |
| 2582 | add_com_suppress_notification ("select-frame", class_stack, select_frame_command, _("\ |
| 2583 | Select a stack frame without printing anything.\n\ |
| 2584 | An argument specifies the frame to select.\n\ |
| 2585 | It can be a stack frame number or the address of the frame.\n"), |
| 2586 | &cli_suppress_notification.user_selected_context); |
| 2587 | |
| 2588 | add_com ("backtrace", class_stack, backtrace_command, _("\ |
| 2589 | Print backtrace of all stack frames, or innermost COUNT frames.\n\ |
| 2590 | With a negative argument, print outermost -COUNT frames.\nUse of the \ |
| 2591 | 'full' qualifier also prints the values of the local variables.\n\ |
| 2592 | Use of the 'no-filters' qualifier prohibits frame filters from executing\n\ |
| 2593 | on this backtrace.\n")); |
| 2594 | add_com_alias ("bt", "backtrace", class_stack, 0); |
| 2595 | |
| 2596 | add_com_alias ("where", "backtrace", class_alias, 0); |
| 2597 | add_info ("stack", backtrace_command, |
| 2598 | _("Backtrace of the stack, or innermost COUNT frames.")); |
| 2599 | add_info_alias ("s", "stack", 1); |
| 2600 | add_info ("frame", info_frame_command, |
| 2601 | _("All about selected stack frame, or frame at ADDR.")); |
| 2602 | add_info_alias ("f", "frame", 1); |
| 2603 | add_info ("locals", info_locals_command, |
| 2604 | _("Local variables of current stack frame.")); |
| 2605 | add_info ("args", info_args_command, |
| 2606 | _("Argument variables of current stack frame.")); |
| 2607 | |
| 2608 | if (dbx_commands) |
| 2609 | add_com ("func", class_stack, func_command, _("\ |
| 2610 | Select the stack frame that contains <func>.\n\ |
| 2611 | Usage: func <name>\n")); |
| 2612 | |
| 2613 | add_setshow_enum_cmd ("frame-arguments", class_stack, |
| 2614 | print_frame_arguments_choices, &print_frame_arguments, |
| 2615 | _("Set printing of non-scalar frame arguments"), |
| 2616 | _("Show printing of non-scalar frame arguments"), |
| 2617 | NULL, NULL, NULL, &setprintlist, &showprintlist); |
| 2618 | |
| 2619 | add_setshow_boolean_cmd ("frame-arguments", no_class, |
| 2620 | &print_raw_frame_arguments, _("\ |
| 2621 | Set whether to print frame arguments in raw form."), _("\ |
| 2622 | Show whether to print frame arguments in raw form."), _("\ |
| 2623 | If set, frame arguments are printed in raw form, bypassing any\n\ |
| 2624 | pretty-printers for that value."), |
| 2625 | NULL, NULL, |
| 2626 | &setprintrawlist, &showprintrawlist); |
| 2627 | |
| 2628 | add_setshow_auto_boolean_cmd ("disassemble-next-line", class_stack, |
| 2629 | &disassemble_next_line, _("\ |
| 2630 | Set whether to disassemble next source line or insn when execution stops."), |
| 2631 | _("\ |
| 2632 | Show whether to disassemble next source line or insn when execution stops."), |
| 2633 | _("\ |
| 2634 | If ON, GDB will display disassembly of the next source line, in addition\n\ |
| 2635 | to displaying the source line itself. If the next source line cannot\n\ |
| 2636 | be displayed (e.g., source is unavailable or there's no line info), GDB\n\ |
| 2637 | will display disassembly of next instruction instead of showing the\n\ |
| 2638 | source line.\n\ |
| 2639 | If AUTO, display disassembly of next instruction only if the source line\n\ |
| 2640 | cannot be displayed.\n\ |
| 2641 | If OFF (which is the default), never display the disassembly of the next\n\ |
| 2642 | source line."), |
| 2643 | NULL, |
| 2644 | show_disassemble_next_line, |
| 2645 | &setlist, &showlist); |
| 2646 | disassemble_next_line = AUTO_BOOLEAN_FALSE; |
| 2647 | |
| 2648 | add_setshow_enum_cmd ("entry-values", class_stack, |
| 2649 | print_entry_values_choices, &print_entry_values, |
| 2650 | _("Set printing of function arguments at function " |
| 2651 | "entry"), |
| 2652 | _("Show printing of function arguments at function " |
| 2653 | "entry"), |
| 2654 | _("\ |
| 2655 | GDB can sometimes determine the values of function arguments at entry,\n\ |
| 2656 | in addition to their current values. This option tells GDB whether\n\ |
| 2657 | to print the current value, the value at entry (marked as val@entry),\n\ |
| 2658 | or both. Note that one or both of these values may be <optimized out>."), |
| 2659 | NULL, NULL, &setprintlist, &showprintlist); |
| 2660 | } |