/* Print and select stack frames for GDB, the GNU debugger. Copyright (C) 1986-2019 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "value.h" #include "symtab.h" #include "gdbtypes.h" #include "expression.h" #include "language.h" #include "frame.h" #include "gdbcmd.h" #include "gdbcore.h" #include "target.h" #include "source.h" #include "breakpoint.h" #include "demangle.h" #include "inferior.h" #include "annotate.h" #include "ui-out.h" #include "block.h" #include "stack.h" #include "dictionary.h" #include "reggroups.h" #include "regcache.h" #include "solib.h" #include "valprint.h" #include "gdbthread.h" #include "cp-support.h" #include "disasm.h" #include "inline-frame.h" #include "linespec.h" #include "cli/cli-utils.h" #include "objfiles.h" #include "annotate.h" #include "symfile.h" #include "extension.h" #include "observable.h" #include "gdbsupport/def-vector.h" #include "cli/cli-option.h" /* The possible choices of "set print frame-arguments", and the value of this setting. */ const char print_frame_arguments_all[] = "all"; const char print_frame_arguments_scalars[] = "scalars"; const char print_frame_arguments_none[] = "none"; static const char *const print_frame_arguments_choices[] = { print_frame_arguments_all, print_frame_arguments_scalars, print_frame_arguments_none, NULL }; /* The possible choices of "set print entry-values", and the value of this setting. */ const char print_entry_values_no[] = "no"; const char print_entry_values_only[] = "only"; const char print_entry_values_preferred[] = "preferred"; const char print_entry_values_if_needed[] = "if-needed"; const char print_entry_values_both[] = "both"; const char print_entry_values_compact[] = "compact"; const char print_entry_values_default[] = "default"; static const char *const print_entry_values_choices[] = { print_entry_values_no, print_entry_values_only, print_entry_values_preferred, print_entry_values_if_needed, print_entry_values_both, print_entry_values_compact, print_entry_values_default, NULL }; /* See frame.h. */ frame_print_options user_frame_print_options; /* Option definitions for some frame-related "set print ..." settings. */ using boolean_option_def = gdb::option::boolean_option_def<frame_print_options>; using enum_option_def = gdb::option::enum_option_def<frame_print_options>; static const gdb::option::option_def frame_print_option_defs[] = { enum_option_def { "entry-values", print_entry_values_choices, [] (frame_print_options *opt) { return &opt->print_entry_values; }, NULL, /* show_cmd_cb */ N_("Set printing of function arguments at function entry"), N_("Show printing of function arguments at function entry"), N_("GDB can sometimes determine the values of function arguments at entry,\n\ in addition to their current values. This option tells GDB whether\n\ to print the current value, the value at entry (marked as val@entry),\n\ or both. Note that one or both of these values may be <optimized out>."), }, enum_option_def { "frame-arguments", print_frame_arguments_choices, [] (frame_print_options *opt) { return &opt->print_frame_arguments; }, NULL, /* show_cmd_cb */ N_("Set printing of non-scalar frame arguments"), N_("Show printing of non-scalar frame arguments"), NULL /* help_doc */ }, boolean_option_def { "raw-frame-arguments", [] (frame_print_options *opt) { return &opt->print_raw_frame_arguments; }, NULL, /* show_cmd_cb */ N_("Set whether to print frame arguments in raw form."), N_("Show whether to print frame arguments in raw form."), N_("If set, frame arguments are printed in raw form, bypassing any\n\ pretty-printers for that value.") }, }; /* Options for the "backtrace" command. */ struct backtrace_cmd_options { int full = 0; int no_filters = 0; int hide = 0; }; using bt_flag_option_def = gdb::option::flag_option_def<backtrace_cmd_options>; static const gdb::option::option_def backtrace_command_option_defs[] = { bt_flag_option_def { "full", [] (backtrace_cmd_options *opt) { return &opt->full; }, N_("Print values of local variables.") }, bt_flag_option_def { "no-filters", [] (backtrace_cmd_options *opt) { return &opt->no_filters; }, N_("Prohibit frame filters from executing on a backtrace."), }, bt_flag_option_def { "hide", [] (backtrace_cmd_options *opt) { return &opt->hide; }, N_("Causes Python frame filter elided frames to not be printed."), }, }; /* Prototypes for local functions. */ static void print_frame_local_vars (struct frame_info *frame, bool quiet, const char *regexp, const char *t_regexp, int num_tabs, struct ui_file *stream); static void print_frame (const frame_print_options &opts, frame_info *frame, int print_level, enum print_what print_what, int print_args, struct symtab_and_line sal); static void set_last_displayed_sal (int valid, struct program_space *pspace, CORE_ADDR addr, struct symtab *symtab, int line); static struct frame_info *find_frame_for_function (const char *); static struct frame_info *find_frame_for_address (CORE_ADDR); /* Zero means do things normally; we are interacting directly with the user. One means print the full filename and linenumber when a frame is printed, and do so in a format emacs18/emacs19.22 can parse. Two means print similar annotations, but in many more cases and in a slightly different syntax. */ int annotation_level = 0; /* These variables hold the last symtab and line we displayed to the user. * This is where we insert a breakpoint or a skiplist entry by default. */ static int last_displayed_sal_valid = 0; static struct program_space *last_displayed_pspace = 0; static CORE_ADDR last_displayed_addr = 0; static struct symtab *last_displayed_symtab = 0; static int last_displayed_line = 0; /* Return 1 if we should display the address in addition to the location, because we are in the middle of a statement. */ static int frame_show_address (struct frame_info *frame, struct symtab_and_line sal) { /* If there is a line number, but no PC, then there is no location information associated with this sal. The only way that should happen is for the call sites of inlined functions (SAL comes from find_frame_sal). Otherwise, we would have some PC range if the SAL came from a line table. */ if (sal.line != 0 && sal.pc == 0 && sal.end == 0) { if (get_next_frame (frame) == NULL) gdb_assert (inline_skipped_frames (inferior_thread ()) > 0); else gdb_assert (get_frame_type (get_next_frame (frame)) == INLINE_FRAME); return 0; } return get_frame_pc (frame) != sal.pc; } /* See frame.h. */ void print_stack_frame_to_uiout (struct ui_out *uiout, struct frame_info *frame, int print_level, enum print_what print_what, int set_current_sal) { scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); print_stack_frame (frame, print_level, print_what, set_current_sal); } /* Show or print a stack frame FRAME briefly. The output is formatted according to PRINT_LEVEL and PRINT_WHAT printing the frame's relative level, function name, argument list, and file name and line number. If the frame's PC is not at the beginning of the source line, the actual PC is printed at the beginning. */ void print_stack_frame (struct frame_info *frame, int print_level, enum print_what print_what, int set_current_sal) { /* For mi, alway print location and address. */ if (current_uiout->is_mi_like_p ()) print_what = LOC_AND_ADDRESS; try { print_frame_info (user_frame_print_options, frame, print_level, print_what, 1 /* print_args */, set_current_sal); if (set_current_sal) set_current_sal_from_frame (frame); } catch (const gdb_exception_error &e) { } } /* Print nameless arguments of frame FRAME on STREAM, where START is the offset of the first nameless argument, and NUM is the number of nameless arguments to print. FIRST is nonzero if this is the first argument (not just the first nameless argument). */ static void print_frame_nameless_args (struct frame_info *frame, long start, int num, int first, struct ui_file *stream) { struct gdbarch *gdbarch = get_frame_arch (frame); enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); int i; CORE_ADDR argsaddr; long arg_value; for (i = 0; i < num; i++) { QUIT; argsaddr = get_frame_args_address (frame); if (!argsaddr) return; arg_value = read_memory_integer (argsaddr + start, sizeof (int), byte_order); if (!first) fprintf_filtered (stream, ", "); fprintf_filtered (stream, "%ld", arg_value); first = 0; start += sizeof (int); } } /* Print single argument of inferior function. ARG must be already read in. Errors are printed as if they would be the parameter value. Use zeroed ARG iff it should not be printed accoring to user settings. */ static void print_frame_arg (const frame_print_options &fp_opts, const struct frame_arg *arg) { struct ui_out *uiout = current_uiout; string_file stb; gdb_assert (!arg->val || !arg->error); gdb_assert (arg->entry_kind == print_entry_values_no || arg->entry_kind == print_entry_values_only || (!uiout->is_mi_like_p () && arg->entry_kind == print_entry_values_compact)); annotate_arg_emitter arg_emitter; ui_out_emit_tuple tuple_emitter (uiout, NULL); fprintf_symbol_filtered (&stb, SYMBOL_PRINT_NAME (arg->sym), SYMBOL_LANGUAGE (arg->sym), DMGL_PARAMS | DMGL_ANSI); if (arg->entry_kind == print_entry_values_compact) { /* It is OK to provide invalid MI-like stream as with PRINT_ENTRY_VALUE_COMPACT we never use MI. */ stb.puts ("="); fprintf_symbol_filtered (&stb, SYMBOL_PRINT_NAME (arg->sym), SYMBOL_LANGUAGE (arg->sym), DMGL_PARAMS | DMGL_ANSI); } if (arg->entry_kind == print_entry_values_only || arg->entry_kind == print_entry_values_compact) stb.puts ("@entry"); uiout->field_stream ("name", stb, ui_out_style_kind::VARIABLE); annotate_arg_name_end (); uiout->text ("="); if (!arg->val && !arg->error) uiout->text ("..."); else { if (arg->error) stb.printf (_("<error reading variable: %s>"), arg->error); else { try { const struct language_defn *language; struct value_print_options vp_opts; /* Avoid value_print because it will deref ref parameters. We just want to print their addresses. Print ??? for args whose address we do not know. We pass 2 as "recurse" to val_print because our standard indentation here is 4 spaces, and val_print indents 2 for each recurse. */ annotate_arg_value (value_type (arg->val)); /* Use the appropriate language to display our symbol, unless the user forced the language to a specific language. */ if (language_mode == language_mode_auto) language = language_def (SYMBOL_LANGUAGE (arg->sym)); else language = current_language; get_no_prettyformat_print_options (&vp_opts); vp_opts.deref_ref = 1; vp_opts.raw = fp_opts.print_raw_frame_arguments; /* True in "summary" mode, false otherwise. */ vp_opts.summary = fp_opts.print_frame_arguments == print_frame_arguments_scalars; common_val_print (arg->val, &stb, 2, &vp_opts, language); } catch (const gdb_exception_error &except) { stb.printf (_("<error reading variable: %s>"), except.what ()); } } } uiout->field_stream ("value", stb); } /* Read in inferior function local SYM at FRAME into ARGP. Caller is responsible for xfree of ARGP->ERROR. This function never throws an exception. */ void read_frame_local (struct symbol *sym, struct frame_info *frame, struct frame_arg *argp) { argp->sym = sym; argp->val = NULL; argp->error = NULL; try { argp->val = read_var_value (sym, NULL, frame); } catch (const gdb_exception_error &except) { argp->error = xstrdup (except.what ()); } } /* Read in inferior function parameter SYM at FRAME into ARGP. Caller is responsible for xfree of ARGP->ERROR. This function never throws an exception. */ void read_frame_arg (const frame_print_options &fp_opts, symbol *sym, frame_info *frame, struct frame_arg *argp, struct frame_arg *entryargp) { struct value *val = NULL, *entryval = NULL; char *val_error = NULL, *entryval_error = NULL; int val_equal = 0; if (fp_opts.print_entry_values != print_entry_values_only && fp_opts.print_entry_values != print_entry_values_preferred) { try { val = read_var_value (sym, NULL, frame); } catch (const gdb_exception_error &except) { val_error = (char *) alloca (except.message->size () + 1); strcpy (val_error, except.what ()); } } if (SYMBOL_COMPUTED_OPS (sym) != NULL && SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry != NULL && fp_opts.print_entry_values != print_entry_values_no && (fp_opts.print_entry_values != print_entry_values_if_needed || !val || value_optimized_out (val))) { try { const struct symbol_computed_ops *ops; ops = SYMBOL_COMPUTED_OPS (sym); entryval = ops->read_variable_at_entry (sym, frame); } catch (const gdb_exception_error &except) { if (except.error != NO_ENTRY_VALUE_ERROR) { entryval_error = (char *) alloca (except.message->size () + 1); strcpy (entryval_error, except.what ()); } } if (entryval != NULL && value_optimized_out (entryval)) entryval = NULL; if (fp_opts.print_entry_values == print_entry_values_compact || fp_opts.print_entry_values == print_entry_values_default) { /* For MI do not try to use print_entry_values_compact for ARGP. */ if (val && entryval && !current_uiout->is_mi_like_p ()) { struct type *type = value_type (val); if (value_lazy (val)) value_fetch_lazy (val); if (value_lazy (entryval)) value_fetch_lazy (entryval); if (value_contents_eq (val, 0, entryval, 0, TYPE_LENGTH (type))) { /* Initialize it just to avoid a GCC false warning. */ struct value *val_deref = NULL, *entryval_deref; /* DW_AT_call_value does match with the current value. If it is a reference still try to verify if dereferenced DW_AT_call_data_value does not differ. */ try { struct type *type_deref; val_deref = coerce_ref (val); if (value_lazy (val_deref)) value_fetch_lazy (val_deref); type_deref = value_type (val_deref); entryval_deref = coerce_ref (entryval); if (value_lazy (entryval_deref)) value_fetch_lazy (entryval_deref); /* If the reference addresses match but dereferenced content does not match print them. */ if (val != val_deref && value_contents_eq (val_deref, 0, entryval_deref, 0, TYPE_LENGTH (type_deref))) val_equal = 1; } catch (const gdb_exception_error &except) { /* If the dereferenced content could not be fetched do not display anything. */ if (except.error == NO_ENTRY_VALUE_ERROR) val_equal = 1; else if (except.message != NULL) { entryval_error = (char *) alloca (except.message->size () + 1); strcpy (entryval_error, except.what ()); } } /* Value was not a reference; and its content matches. */ if (val == val_deref) val_equal = 1; if (val_equal) entryval = NULL; } } /* Try to remove possibly duplicate error message for ENTRYARGP even in MI mode. */ if (val_error && entryval_error && strcmp (val_error, entryval_error) == 0) { entryval_error = NULL; /* Do not se VAL_EQUAL as the same error message may be shown for the entry value even if no entry values are present in the inferior. */ } } } if (entryval == NULL) { if (fp_opts.print_entry_values == print_entry_values_preferred) { gdb_assert (val == NULL); try { val = read_var_value (sym, NULL, frame); } catch (const gdb_exception_error &except) { val_error = (char *) alloca (except.message->size () + 1); strcpy (val_error, except.what ()); } } if (fp_opts.print_entry_values == print_entry_values_only || fp_opts.print_entry_values == print_entry_values_both || (fp_opts.print_entry_values == print_entry_values_preferred && (!val || value_optimized_out (val)))) { entryval = allocate_optimized_out_value (SYMBOL_TYPE (sym)); entryval_error = NULL; } } if ((fp_opts.print_entry_values == print_entry_values_compact || fp_opts.print_entry_values == print_entry_values_if_needed || fp_opts.print_entry_values == print_entry_values_preferred) && (!val || value_optimized_out (val)) && entryval != NULL) { val = NULL; val_error = NULL; } argp->sym = sym; argp->val = val; argp->error = val_error ? xstrdup (val_error) : NULL; if (!val && !val_error) argp->entry_kind = print_entry_values_only; else if ((fp_opts.print_entry_values == print_entry_values_compact || fp_opts.print_entry_values == print_entry_values_default) && val_equal) { argp->entry_kind = print_entry_values_compact; gdb_assert (!current_uiout->is_mi_like_p ()); } else argp->entry_kind = print_entry_values_no; entryargp->sym = sym; entryargp->val = entryval; entryargp->error = entryval_error ? xstrdup (entryval_error) : NULL; if (!entryval && !entryval_error) entryargp->entry_kind = print_entry_values_no; else entryargp->entry_kind = print_entry_values_only; } /* Print the arguments of frame FRAME on STREAM, given the function FUNC running in that frame (as a symbol), where NUM is the number of arguments according to the stack frame (or -1 if the number of arguments is unknown). */ /* Note that currently the "number of arguments according to the stack frame" is only known on VAX where i refers to the "number of ints of arguments according to the stack frame". */ static void print_frame_args (const frame_print_options &fp_opts, struct symbol *func, struct frame_info *frame, int num, struct ui_file *stream) { struct ui_out *uiout = current_uiout; int first = 1; /* Offset of next stack argument beyond the one we have seen that is at the highest offset, or -1 if we haven't come to a stack argument yet. */ long highest_offset = -1; /* Number of ints of arguments that we have printed so far. */ int args_printed = 0; /* True if we should print arguments, false otherwise. */ bool print_args = fp_opts.print_frame_arguments != print_frame_arguments_none; if (func) { const struct block *b = SYMBOL_BLOCK_VALUE (func); struct block_iterator iter; struct symbol *sym; ALL_BLOCK_SYMBOLS (b, iter, sym) { struct frame_arg arg, entryarg; QUIT; /* Keep track of the highest stack argument offset seen, and skip over any kinds of symbols we don't care about. */ if (!SYMBOL_IS_ARGUMENT (sym)) continue; switch (SYMBOL_CLASS (sym)) { case LOC_ARG: case LOC_REF_ARG: { long current_offset = SYMBOL_VALUE (sym); int arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym)); /* Compute address of next argument by adding the size of this argument and rounding to an int boundary. */ current_offset = ((current_offset + arg_size + sizeof (int) - 1) & ~(sizeof (int) - 1)); /* If this is the highest offset seen yet, set highest_offset. */ if (highest_offset == -1 || (current_offset > highest_offset)) highest_offset = current_offset; /* Add the number of ints we're about to print to args_printed. */ args_printed += (arg_size + sizeof (int) - 1) / sizeof (int); } /* We care about types of symbols, but don't need to keep track of stack offsets in them. */ case LOC_REGISTER: case LOC_REGPARM_ADDR: case LOC_COMPUTED: case LOC_OPTIMIZED_OUT: default: break; } /* We have to look up the symbol because arguments can have two entries (one a parameter, one a local) and the one we want is the local, which lookup_symbol will find for us. This includes gcc1 (not gcc2) on SPARC when passing a small structure and gcc2 when the argument type is float and it is passed as a double and converted to float by the prologue (in the latter case the type of the LOC_ARG symbol is double and the type of the LOC_LOCAL symbol is float). */ /* But if the parameter name is null, don't try it. Null parameter names occur on the RS/6000, for traceback tables. FIXME, should we even print them? */ if (*SYMBOL_LINKAGE_NAME (sym)) { struct symbol *nsym; nsym = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym), b, VAR_DOMAIN).symbol; gdb_assert (nsym != NULL); if (SYMBOL_CLASS (nsym) == LOC_REGISTER && !SYMBOL_IS_ARGUMENT (nsym)) { /* There is a LOC_ARG/LOC_REGISTER pair. This means that it was passed on the stack and loaded into a register, or passed in a register and stored in a stack slot. GDB 3.x used the LOC_ARG; GDB 4.0-4.11 used the LOC_REGISTER. Reasons for using the LOC_ARG: (1) Because find_saved_registers may be slow for remote debugging. (2) Because registers are often re-used and stack slots rarely (never?) are. Therefore using the stack slot is much less likely to print garbage. Reasons why we might want to use the LOC_REGISTER: (1) So that the backtrace prints the same value as "print foo". I see no compelling reason why this needs to be the case; having the backtrace print the value which was passed in, and "print foo" print the value as modified within the called function, makes perfect sense to me. Additional note: It might be nice if "info args" displayed both values. One more note: There is a case with SPARC structure passing where we need to use the LOC_REGISTER, but this is dealt with by creating a single LOC_REGPARM in symbol reading. */ /* Leave sym (the LOC_ARG) alone. */ ; } else sym = nsym; } /* Print the current arg. */ if (!first) uiout->text (", "); uiout->wrap_hint (" "); if (!print_args) { memset (&arg, 0, sizeof (arg)); arg.sym = sym; arg.entry_kind = print_entry_values_no; memset (&entryarg, 0, sizeof (entryarg)); entryarg.sym = sym; entryarg.entry_kind = print_entry_values_no; } else read_frame_arg (fp_opts, sym, frame, &arg, &entryarg); if (arg.entry_kind != print_entry_values_only) print_frame_arg (fp_opts, &arg); if (entryarg.entry_kind != print_entry_values_no) { if (arg.entry_kind != print_entry_values_only) { uiout->text (", "); uiout->wrap_hint (" "); } print_frame_arg (fp_opts, &entryarg); } xfree (arg.error); xfree (entryarg.error); first = 0; } } /* Don't print nameless args in situations where we don't know enough about the stack to find them. */ if (num != -1) { long start; if (highest_offset == -1) start = gdbarch_frame_args_skip (get_frame_arch (frame)); else start = highest_offset; print_frame_nameless_args (frame, start, num - args_printed, first, stream); } } /* Set the current source and line to the location given by frame FRAME, if possible. When CENTER is true, adjust so the relevant line is in the center of the next 'list'. */ void set_current_sal_from_frame (struct frame_info *frame) { symtab_and_line sal = find_frame_sal (frame); if (sal.symtab != NULL) set_current_source_symtab_and_line (sal); } /* If ON, GDB will display disassembly of the next source line when execution of the program being debugged stops. If AUTO (which is the default), or there's no line info to determine the source line of the next instruction, display disassembly of next instruction instead. */ static enum auto_boolean disassemble_next_line; static void show_disassemble_next_line (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { fprintf_filtered (file, _("Debugger's willingness to use " "disassemble-next-line is %s.\n"), value); } /* Use TRY_CATCH to catch the exception from the gdb_disassembly because it will be broken by filter sometime. */ static void do_gdb_disassembly (struct gdbarch *gdbarch, int how_many, CORE_ADDR low, CORE_ADDR high) { try { gdb_disassembly (gdbarch, current_uiout, DISASSEMBLY_RAW_INSN, how_many, low, high); } catch (const gdb_exception_error &exception) { /* If an exception was thrown while doing the disassembly, print the error message, to give the user a clue of what happened. */ exception_print (gdb_stderr, exception); } } /* Print information about frame FRAME. The output is format according to PRINT_LEVEL and PRINT_WHAT and PRINT_ARGS. The meaning of PRINT_WHAT is: SRC_LINE: Print only source line. LOCATION: Print only location. SRC_AND_LOC: Print location and source line. Used in "where" output, and to emit breakpoint or step messages. */ void print_frame_info (const frame_print_options &fp_opts, frame_info *frame, int print_level, enum print_what print_what, int print_args, int set_current_sal) { struct gdbarch *gdbarch = get_frame_arch (frame); int source_print; int location_print; struct ui_out *uiout = current_uiout; if (get_frame_type (frame) == DUMMY_FRAME || get_frame_type (frame) == SIGTRAMP_FRAME || get_frame_type (frame) == ARCH_FRAME) { ui_out_emit_tuple tuple_emitter (uiout, "frame"); annotate_frame_begin (print_level ? frame_relative_level (frame) : 0, gdbarch, get_frame_pc (frame)); /* Do this regardless of SOURCE because we don't have any source to list for this frame. */ if (print_level) { uiout->text ("#"); uiout->field_fmt_signed (2, ui_left, "level", frame_relative_level (frame)); } if (uiout->is_mi_like_p ()) { annotate_frame_address (); uiout->field_core_addr ("addr", gdbarch, get_frame_pc (frame)); annotate_frame_address_end (); } if (get_frame_type (frame) == DUMMY_FRAME) { annotate_function_call (); uiout->field_string ("func", "<function called from gdb>", ui_out_style_kind::FUNCTION); } else if (get_frame_type (frame) == SIGTRAMP_FRAME) { annotate_signal_handler_caller (); uiout->field_string ("func", "<signal handler called>", ui_out_style_kind::FUNCTION); } else if (get_frame_type (frame) == ARCH_FRAME) { uiout->field_string ("func", "<cross-architecture call>", ui_out_style_kind::FUNCTION); } uiout->text ("\n"); annotate_frame_end (); /* If disassemble-next-line is set to auto or on output the next instruction. */ if (disassemble_next_line == AUTO_BOOLEAN_AUTO || disassemble_next_line == AUTO_BOOLEAN_TRUE) do_gdb_disassembly (get_frame_arch (frame), 1, get_frame_pc (frame), get_frame_pc (frame) + 1); return; } /* If FRAME is not the innermost frame, that normally means that FRAME->pc points to *after* the call instruction, and we want to get the line containing the call, never the next line. But if the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the next frame was not entered as the result of a call, and we want to get the line containing FRAME->pc. */ symtab_and_line sal = find_frame_sal (frame); location_print = (print_what == LOCATION || print_what == LOC_AND_ADDRESS || print_what == SRC_AND_LOC); if (location_print || !sal.symtab) print_frame (fp_opts, frame, print_level, print_what, print_args, sal); source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC); /* If disassemble-next-line is set to auto or on and doesn't have the line debug messages for $pc, output the next instruction. */ if ((disassemble_next_line == AUTO_BOOLEAN_AUTO || disassemble_next_line == AUTO_BOOLEAN_TRUE) && source_print && !sal.symtab) do_gdb_disassembly (get_frame_arch (frame), 1, get_frame_pc (frame), get_frame_pc (frame) + 1); if (source_print && sal.symtab) { int mid_statement = ((print_what == SRC_LINE) && frame_show_address (frame, sal)); annotate_source_line (sal.symtab, sal.line, mid_statement, get_frame_pc (frame)); if (deprecated_print_frame_info_listing_hook) deprecated_print_frame_info_listing_hook (sal.symtab, sal.line, sal.line + 1, 0); else { struct value_print_options opts; get_user_print_options (&opts); /* We used to do this earlier, but that is clearly wrong. This function is used by many different parts of gdb, including normal_stop in infrun.c, which uses this to print out the current PC when we stepi/nexti into the middle of a source line. Only the command line really wants this behavior. Other UIs probably would like the ability to decide for themselves if it is desired. */ if (opts.addressprint && mid_statement) { uiout->field_core_addr ("addr", gdbarch, get_frame_pc (frame)); uiout->text ("\t"); } print_source_lines (sal.symtab, sal.line, sal.line + 1, 0); } } /* If disassemble-next-line is set to on and there is line debug messages, output assembly codes for next line. */ if (disassemble_next_line == AUTO_BOOLEAN_TRUE) do_gdb_disassembly (get_frame_arch (frame), -1, sal.pc, sal.end); if (set_current_sal) { CORE_ADDR pc; if (get_frame_pc_if_available (frame, &pc)) set_last_displayed_sal (1, sal.pspace, pc, sal.symtab, sal.line); else set_last_displayed_sal (0, 0, 0, 0, 0); } annotate_frame_end (); gdb_flush (gdb_stdout); } /* Remember the last symtab and line we displayed, which we use e.g. * as the place to put a breakpoint when the `break' command is * invoked with no arguments. */ static void set_last_displayed_sal (int valid, struct program_space *pspace, CORE_ADDR addr, struct symtab *symtab, int line) { last_displayed_sal_valid = valid; last_displayed_pspace = pspace; last_displayed_addr = addr; last_displayed_symtab = symtab; last_displayed_line = line; if (valid && pspace == NULL) { clear_last_displayed_sal (); internal_error (__FILE__, __LINE__, _("Trying to set NULL pspace.")); } } /* Forget the last sal we displayed. */ void clear_last_displayed_sal (void) { last_displayed_sal_valid = 0; last_displayed_pspace = 0; last_displayed_addr = 0; last_displayed_symtab = 0; last_displayed_line = 0; } /* Is our record of the last sal we displayed valid? If not, * the get_last_displayed_* functions will return NULL or 0, as * appropriate. */ int last_displayed_sal_is_valid (void) { return last_displayed_sal_valid; } /* Get the pspace of the last sal we displayed, if it's valid. */ struct program_space * get_last_displayed_pspace (void) { if (last_displayed_sal_valid) return last_displayed_pspace; return 0; } /* Get the address of the last sal we displayed, if it's valid. */ CORE_ADDR get_last_displayed_addr (void) { if (last_displayed_sal_valid) return last_displayed_addr; return 0; } /* Get the symtab of the last sal we displayed, if it's valid. */ struct symtab* get_last_displayed_symtab (void) { if (last_displayed_sal_valid) return last_displayed_symtab; return 0; } /* Get the line of the last sal we displayed, if it's valid. */ int get_last_displayed_line (void) { if (last_displayed_sal_valid) return last_displayed_line; return 0; } /* Get the last sal we displayed, if it's valid. */ symtab_and_line get_last_displayed_sal () { symtab_and_line sal; if (last_displayed_sal_valid) { sal.pspace = last_displayed_pspace; sal.pc = last_displayed_addr; sal.symtab = last_displayed_symtab; sal.line = last_displayed_line; } return sal; } /* Attempt to obtain the name, FUNLANG and optionally FUNCP of the function corresponding to FRAME. */ gdb::unique_xmalloc_ptr<char> find_frame_funname (struct frame_info *frame, enum language *funlang, struct symbol **funcp) { struct symbol *func; gdb::unique_xmalloc_ptr<char> funname; *funlang = language_unknown; if (funcp) *funcp = NULL; func = get_frame_function (frame); if (func) { /* In certain pathological cases, the symtabs give the wrong function (when we are in the first function in a file which is compiled without debugging symbols, the previous function is compiled with debugging symbols, and the "foo.o" symbol that is supposed to tell us where the file with debugging symbols ends has been truncated by ar because it is longer than 15 characters). This also occurs if the user uses asm() to create a function but not stabs for it (in a file compiled with -g). So look in the minimal symbol tables as well, and if it comes up with a larger address for the function use that instead. I don't think this can ever cause any problems; there shouldn't be any minimal symbols in the middle of a function; if this is ever changed many parts of GDB will need to be changed (and we'll create a find_pc_minimal_function or some such). */ struct bound_minimal_symbol msymbol; /* Don't attempt to do this for inlined functions, which do not have a corresponding minimal symbol. */ if (!block_inlined_p (SYMBOL_BLOCK_VALUE (func))) msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame)); else memset (&msymbol, 0, sizeof (msymbol)); if (msymbol.minsym != NULL && (BMSYMBOL_VALUE_ADDRESS (msymbol) > BLOCK_ENTRY_PC (SYMBOL_BLOCK_VALUE (func)))) { /* We also don't know anything about the function besides its address and name. */ func = 0; funname.reset (xstrdup (MSYMBOL_PRINT_NAME (msymbol.minsym))); *funlang = MSYMBOL_LANGUAGE (msymbol.minsym); } else { const char *print_name = SYMBOL_PRINT_NAME (func); *funlang = SYMBOL_LANGUAGE (func); if (funcp) *funcp = func; if (*funlang == language_cplus) { /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to display the demangled name that we already have stored in the symbol table, but we stored a version with DMGL_PARAMS turned on, and here we don't want to display parameters. So remove the parameters. */ funname = cp_remove_params (print_name); } /* If we didn't hit the C++ case above, set *funname here. */ if (funname == NULL) funname.reset (xstrdup (print_name)); } } else { struct bound_minimal_symbol msymbol; CORE_ADDR pc; if (!get_frame_address_in_block_if_available (frame, &pc)) return funname; msymbol = lookup_minimal_symbol_by_pc (pc); if (msymbol.minsym != NULL) { funname.reset (xstrdup (MSYMBOL_PRINT_NAME (msymbol.minsym))); *funlang = MSYMBOL_LANGUAGE (msymbol.minsym); } } return funname; } static void print_frame (const frame_print_options &fp_opts, frame_info *frame, int print_level, enum print_what print_what, int print_args, struct symtab_and_line sal) { struct gdbarch *gdbarch = get_frame_arch (frame); struct ui_out *uiout = current_uiout; enum language funlang = language_unknown; struct value_print_options opts; struct symbol *func; CORE_ADDR pc = 0; int pc_p; pc_p = get_frame_pc_if_available (frame, &pc); gdb::unique_xmalloc_ptr<char> funname = find_frame_funname (frame, &funlang, &func); annotate_frame_begin (print_level ? frame_relative_level (frame) : 0, gdbarch, pc); { ui_out_emit_tuple tuple_emitter (uiout, "frame"); if (print_level) { uiout->text ("#"); uiout->field_fmt_signed (2, ui_left, "level", frame_relative_level (frame)); } get_user_print_options (&opts); if (opts.addressprint) if (!sal.symtab || frame_show_address (frame, sal) || print_what == LOC_AND_ADDRESS) { annotate_frame_address (); if (pc_p) uiout->field_core_addr ("addr", gdbarch, pc); else uiout->field_string ("addr", "<unavailable>", ui_out_style_kind::ADDRESS); annotate_frame_address_end (); uiout->text (" in "); } annotate_frame_function_name (); string_file stb; fprintf_symbol_filtered (&stb, funname ? funname.get () : "??", funlang, DMGL_ANSI); uiout->field_stream ("func", stb, ui_out_style_kind::FUNCTION); uiout->wrap_hint (" "); annotate_frame_args (); uiout->text (" ("); if (print_args) { int numargs; if (gdbarch_frame_num_args_p (gdbarch)) { numargs = gdbarch_frame_num_args (gdbarch, frame); gdb_assert (numargs >= 0); } else numargs = -1; { ui_out_emit_list list_emitter (uiout, "args"); try { print_frame_args (fp_opts, func, frame, numargs, gdb_stdout); } catch (const gdb_exception_error &e) { } /* FIXME: ARGS must be a list. If one argument is a string it will have " that will not be properly escaped. */ } QUIT; } uiout->text (")"); if (sal.symtab) { const char *filename_display; filename_display = symtab_to_filename_for_display (sal.symtab); annotate_frame_source_begin (); uiout->wrap_hint (" "); uiout->text (" at "); annotate_frame_source_file (); uiout->field_string ("file", filename_display, ui_out_style_kind::FILE); if (uiout->is_mi_like_p ()) { const char *fullname = symtab_to_fullname (sal.symtab); uiout->field_string ("fullname", fullname); } annotate_frame_source_file_end (); uiout->text (":"); annotate_frame_source_line (); uiout->field_signed ("line", sal.line); annotate_frame_source_end (); } if (pc_p && (funname == NULL || sal.symtab == NULL)) { char *lib = solib_name_from_address (get_frame_program_space (frame), get_frame_pc (frame)); if (lib) { annotate_frame_where (); uiout->wrap_hint (" "); uiout->text (" from "); uiout->field_string ("from", lib); } } if (uiout->is_mi_like_p ()) uiout->field_string ("arch", (gdbarch_bfd_arch_info (gdbarch))->printable_name); } uiout->text ("\n"); } /* Completion function for "frame function", "info frame function", and "select-frame function" commands. */ void frame_selection_by_function_completer (struct cmd_list_element *ignore, completion_tracker &tracker, const char *text, const char *word) { /* This is used to complete function names within a stack. It would be nice if we only offered functions that were actually in the stack. However, this would mean unwinding the stack to completion, which could take too long, or on a corrupted stack, possibly not end. Instead, we offer all symbol names as a safer choice. */ collect_symbol_completion_matches (tracker, complete_symbol_mode::EXPRESSION, symbol_name_match_type::EXPRESSION, text, word); } /* Core of all the "info frame" sub-commands. Print information about a frame FI. If SELECTED_FRAME_P is true then the user didn't provide a frame specification, they just entered 'info frame'. If the user did provide a frame specification (for example 'info frame 0', 'info frame level 1') then SELECTED_FRAME_P will be false. */ static void info_frame_command_core (struct frame_info *fi, bool selected_frame_p) { struct symbol *func; struct symtab *s; struct frame_info *calling_frame_info; int numregs; const char *funname = 0; enum language funlang = language_unknown; const char *pc_regname; struct gdbarch *gdbarch; CORE_ADDR frame_pc; int frame_pc_p; /* Initialize it to avoid "may be used uninitialized" warning. */ CORE_ADDR caller_pc = 0; int caller_pc_p = 0; gdbarch = get_frame_arch (fi); /* Name of the value returned by get_frame_pc(). Per comments, "pc" is not a good name. */ if (gdbarch_pc_regnum (gdbarch) >= 0) /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can easily not match that of the internal value returned by get_frame_pc(). */ pc_regname = gdbarch_register_name (gdbarch, gdbarch_pc_regnum (gdbarch)); else /* But then, this is weird to. Even without gdbarch_pc_regnum, an architectures will often have a hardware register called "pc", and that register's value, again, can easily not match get_frame_pc(). */ pc_regname = "pc"; frame_pc_p = get_frame_pc_if_available (fi, &frame_pc); func = get_frame_function (fi); symtab_and_line sal = find_frame_sal (fi); s = sal.symtab; gdb::unique_xmalloc_ptr<char> func_only; if (func) { funname = SYMBOL_PRINT_NAME (func); funlang = SYMBOL_LANGUAGE (func); if (funlang == language_cplus) { /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to display the demangled name that we already have stored in the symbol table, but we stored a version with DMGL_PARAMS turned on, and here we don't want to display parameters. So remove the parameters. */ func_only = cp_remove_params (funname); if (func_only) funname = func_only.get (); } } else if (frame_pc_p) { struct bound_minimal_symbol msymbol; msymbol = lookup_minimal_symbol_by_pc (frame_pc); if (msymbol.minsym != NULL) { funname = MSYMBOL_PRINT_NAME (msymbol.minsym); funlang = MSYMBOL_LANGUAGE (msymbol.minsym); } } calling_frame_info = get_prev_frame (fi); if (selected_frame_p && frame_relative_level (fi) >= 0) { printf_filtered (_("Stack level %d, frame at "), frame_relative_level (fi)); } else { printf_filtered (_("Stack frame at ")); } fputs_filtered (paddress (gdbarch, get_frame_base (fi)), gdb_stdout); printf_filtered (":\n"); printf_filtered (" %s = ", pc_regname); if (frame_pc_p) fputs_filtered (paddress (gdbarch, get_frame_pc (fi)), gdb_stdout); else fputs_filtered ("<unavailable>", gdb_stdout); wrap_here (" "); if (funname) { printf_filtered (" in "); fprintf_symbol_filtered (gdb_stdout, funname, funlang, DMGL_ANSI | DMGL_PARAMS); } wrap_here (" "); if (sal.symtab) printf_filtered (" (%s:%d)", symtab_to_filename_for_display (sal.symtab), sal.line); puts_filtered ("; "); wrap_here (" "); printf_filtered ("saved %s = ", pc_regname); if (!frame_id_p (frame_unwind_caller_id (fi))) val_print_not_saved (gdb_stdout); else { try { caller_pc = frame_unwind_caller_pc (fi); caller_pc_p = 1; } catch (const gdb_exception_error &ex) { switch (ex.error) { case NOT_AVAILABLE_ERROR: val_print_unavailable (gdb_stdout); break; case OPTIMIZED_OUT_ERROR: val_print_not_saved (gdb_stdout); break; default: fprintf_filtered (gdb_stdout, _("<error: %s>"), ex.what ()); break; } } } if (caller_pc_p) fputs_filtered (paddress (gdbarch, caller_pc), gdb_stdout); printf_filtered ("\n"); if (calling_frame_info == NULL) { enum unwind_stop_reason reason; reason = get_frame_unwind_stop_reason (fi); if (reason != UNWIND_NO_REASON) printf_filtered (_(" Outermost frame: %s\n"), frame_stop_reason_string (fi)); } else if (get_frame_type (fi) == TAILCALL_FRAME) puts_filtered (" tail call frame"); else if (get_frame_type (fi) == INLINE_FRAME) printf_filtered (" inlined into frame %d", frame_relative_level (get_prev_frame (fi))); else { printf_filtered (" called by frame at "); fputs_filtered (paddress (gdbarch, get_frame_base (calling_frame_info)), gdb_stdout); } if (get_next_frame (fi) && calling_frame_info) puts_filtered (","); wrap_here (" "); if (get_next_frame (fi)) { printf_filtered (" caller of frame at "); fputs_filtered (paddress (gdbarch, get_frame_base (get_next_frame (fi))), gdb_stdout); } if (get_next_frame (fi) || calling_frame_info) puts_filtered ("\n"); if (s) printf_filtered (" source language %s.\n", language_str (s->language)); { /* Address of the argument list for this frame, or 0. */ CORE_ADDR arg_list = get_frame_args_address (fi); /* Number of args for this frame, or -1 if unknown. */ int numargs; if (arg_list == 0) printf_filtered (" Arglist at unknown address.\n"); else { printf_filtered (" Arglist at "); fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout); printf_filtered (","); if (!gdbarch_frame_num_args_p (gdbarch)) { numargs = -1; puts_filtered (" args: "); } else { numargs = gdbarch_frame_num_args (gdbarch, fi); gdb_assert (numargs >= 0); if (numargs == 0) puts_filtered (" no args."); else if (numargs == 1) puts_filtered (" 1 arg: "); else printf_filtered (" %d args: ", numargs); } print_frame_args (user_frame_print_options, func, fi, numargs, gdb_stdout); puts_filtered ("\n"); } } { /* Address of the local variables for this frame, or 0. */ CORE_ADDR arg_list = get_frame_locals_address (fi); if (arg_list == 0) printf_filtered (" Locals at unknown address,"); else { printf_filtered (" Locals at "); fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout); printf_filtered (","); } } /* Print as much information as possible on the location of all the registers. */ { int count; int i; int need_nl = 1; int sp_regnum = gdbarch_sp_regnum (gdbarch); /* The sp is special; what's displayed isn't the save address, but the value of the previous frame's sp. This is a legacy thing, at one stage the frame cached the previous frame's SP instead of its address, hence it was easiest to just display the cached value. */ if (sp_regnum >= 0) { struct value *value = frame_unwind_register_value (fi, sp_regnum); gdb_assert (value != NULL); if (!value_optimized_out (value) && value_entirely_available (value)) { if (VALUE_LVAL (value) == not_lval) { CORE_ADDR sp; enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); int sp_size = register_size (gdbarch, sp_regnum); sp = extract_unsigned_integer (value_contents_all (value), sp_size, byte_order); printf_filtered (" Previous frame's sp is "); fputs_filtered (paddress (gdbarch, sp), gdb_stdout); printf_filtered ("\n"); } else if (VALUE_LVAL (value) == lval_memory) { printf_filtered (" Previous frame's sp at "); fputs_filtered (paddress (gdbarch, value_address (value)), gdb_stdout); printf_filtered ("\n"); } else if (VALUE_LVAL (value) == lval_register) { printf_filtered (" Previous frame's sp in %s\n", gdbarch_register_name (gdbarch, VALUE_REGNUM (value))); } release_value (value); need_nl = 0; } /* else keep quiet. */ } count = 0; numregs = gdbarch_num_cooked_regs (gdbarch); for (i = 0; i < numregs; i++) if (i != sp_regnum && gdbarch_register_reggroup_p (gdbarch, i, all_reggroup)) { enum lval_type lval; int optimized; int unavailable; CORE_ADDR addr; int realnum; /* Find out the location of the saved register without fetching the corresponding value. */ frame_register_unwind (fi, i, &optimized, &unavailable, &lval, &addr, &realnum, NULL); /* For moment, only display registers that were saved on the stack. */ if (!optimized && !unavailable && lval == lval_memory) { if (count == 0) puts_filtered (" Saved registers:\n "); else puts_filtered (","); wrap_here (" "); printf_filtered (" %s at ", gdbarch_register_name (gdbarch, i)); fputs_filtered (paddress (gdbarch, addr), gdb_stdout); count++; } } if (count || need_nl) puts_filtered ("\n"); } } /* Return the innermost frame at level LEVEL. */ static struct frame_info * leading_innermost_frame (int level) { struct frame_info *leading; leading = get_current_frame (); gdb_assert (level >= 0); while (leading != nullptr && level) { QUIT; leading = get_prev_frame (leading); level--; } return leading; } /* Return the starting frame needed to handle COUNT outermost frames. */ static struct frame_info * trailing_outermost_frame (int count) { struct frame_info *current; struct frame_info *trailing; trailing = get_current_frame (); gdb_assert (count > 0); current = trailing; while (current != nullptr && count--) { QUIT; current = get_prev_frame (current); } /* Will stop when CURRENT reaches the top of the stack. TRAILING will be COUNT below it. */ while (current != nullptr) { QUIT; trailing = get_prev_frame (trailing); current = get_prev_frame (current); } return trailing; } /* The core of all the "select-frame" sub-commands. Just wraps a call to SELECT_FRAME. */ static void select_frame_command_core (struct frame_info *fi, bool ignored) { struct frame_info *prev_frame = get_selected_frame_if_set (); select_frame (fi); if (get_selected_frame_if_set () != prev_frame) gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME); } /* See stack.h. */ void select_frame_for_mi (struct frame_info *fi) { select_frame_command_core (fi, false /* Ignored. */); } /* The core of all the "frame" sub-commands. Select frame FI, and if this means we change frame send out a change notification (otherwise, just reprint the current frame summary). */ static void frame_command_core (struct frame_info *fi, bool ignored) { struct frame_info *prev_frame = get_selected_frame_if_set (); select_frame (fi); if (get_selected_frame_if_set () != prev_frame) gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME); else print_selected_thread_frame (current_uiout, USER_SELECTED_FRAME); } /* The three commands 'frame', 'select-frame', and 'info frame' all have a common set of sub-commands that allow a specific frame to be selected. All of the sub-command functions are static methods within this class template which is then instantiated below. The template parameter is a callback used to implement the functionality of the base command ('frame', 'select-frame', or 'info frame'). In the template parameter FI is the frame being selected. The SELECTED_FRAME_P flag is true if the frame being selected was done by default, which happens when the user uses the base command with no arguments. For example the commands 'info frame', 'select-frame', 'frame' will all cause SELECTED_FRAME_P to be true. In all other cases SELECTED_FRAME_P is false. */ template <void (*FPTR) (struct frame_info *fi, bool selected_frame_p)> class frame_command_helper { public: /* The "frame level" family of commands. The ARG is an integer that is the frame's level in the stack. */ static void level (const char *arg, int from_tty) { int level = value_as_long (parse_and_eval (arg)); struct frame_info *fid = find_relative_frame (get_current_frame (), &level); if (level != 0) error (_("No frame at level %s."), arg); FPTR (fid, false); } /* The "frame address" family of commands. ARG is a stack-pointer address for an existing frame. This command does not allow new frames to be created. */ static void address (const char *arg, int from_tty) { CORE_ADDR addr = value_as_address (parse_and_eval (arg)); struct frame_info *fid = find_frame_for_address (addr); if (fid == NULL) error (_("No frame at address %s."), arg); FPTR (fid, false); } /* The "frame view" family of commands. ARG is one or two addresses and is used to view a frame that might be outside the current backtrace. The addresses are stack-pointer address, and (optional) pc-address. */ static void view (const char *args, int from_tty) { struct frame_info *fid; if (args == NULL) error (_("Missing address argument to view a frame")); gdb_argv argv (args); if (argv.count () == 2) { CORE_ADDR addr[2]; addr [0] = value_as_address (parse_and_eval (argv[0])); addr [1] = value_as_address (parse_and_eval (argv[1])); fid = create_new_frame (addr[0], addr[1]); } else { CORE_ADDR addr = value_as_address (parse_and_eval (argv[0])); fid = create_new_frame (addr, false); } FPTR (fid, false); } /* The "frame function" family of commands. ARG is the name of a function within the stack, the first function (searching from frame 0) with that name will be selected. */ static void function (const char *arg, int from_tty) { if (arg == NULL) error (_("Missing function name argument")); struct frame_info *fid = find_frame_for_function (arg); if (fid == NULL) error (_("No frame for function \"%s\"."), arg); FPTR (fid, false); } /* The "frame" base command, that is, when no sub-command is specified. If one argument is provided then we assume that this is a frame's level as historically, this was the supported command syntax that was used most often. If no argument is provided, then the current frame is selected. */ static void base_command (const char *arg, int from_tty) { if (arg == NULL) FPTR (get_selected_frame (_("No stack.")), true); else level (arg, from_tty); } }; /* Instantiate three FRAME_COMMAND_HELPER instances to implement the sub-commands for 'info frame', 'frame', and 'select-frame' commands. */ static frame_command_helper <info_frame_command_core> info_frame_cmd; static frame_command_helper <frame_command_core> frame_cmd; static frame_command_helper <select_frame_command_core> select_frame_cmd; /* Print briefly all stack frames or just the innermost COUNT_EXP frames. */ static void backtrace_command_1 (const frame_print_options &fp_opts, const backtrace_cmd_options &bt_opts, const char *count_exp, int from_tty) { struct frame_info *fi; int count; int py_start = 0, py_end = 0; enum ext_lang_bt_status result = EXT_LANG_BT_ERROR; if (!target_has_stack) error (_("No stack.")); if (count_exp) { count = parse_and_eval_long (count_exp); if (count < 0) py_start = count; else { py_start = 0; /* The argument to apply_ext_lang_frame_filter is the number of the final frame to print, and frames start at 0. */ py_end = count - 1; } } else { py_end = -1; count = -1; } frame_filter_flags flags = 0; if (bt_opts.full) flags |= PRINT_LOCALS; if (bt_opts.hide) flags |= PRINT_HIDE; if (!bt_opts.no_filters) { enum ext_lang_frame_args arg_type; flags |= PRINT_LEVEL | PRINT_FRAME_INFO | PRINT_ARGS; if (from_tty) flags |= PRINT_MORE_FRAMES; if (fp_opts.print_frame_arguments == print_frame_arguments_scalars) arg_type = CLI_SCALAR_VALUES; else if (fp_opts.print_frame_arguments == print_frame_arguments_all) arg_type = CLI_ALL_VALUES; else arg_type = NO_VALUES; result = apply_ext_lang_frame_filter (get_current_frame (), flags, arg_type, current_uiout, py_start, py_end); } /* Run the inbuilt backtrace if there are no filters registered, or "-no-filters" has been specified from the command. */ if (bt_opts.no_filters || result == EXT_LANG_BT_NO_FILTERS) { struct frame_info *trailing; /* The following code must do two things. First, it must set the variable TRAILING to the frame from which we should start printing. Second, it must set the variable count to the number of frames which we should print, or -1 if all of them. */ if (count_exp != NULL && count < 0) { trailing = trailing_outermost_frame (-count); count = -1; } else trailing = get_current_frame (); for (fi = trailing; fi && count--; fi = get_prev_frame (fi)) { QUIT; /* Don't use print_stack_frame; if an error() occurs it probably means further attempts to backtrace would fail (on the other hand, perhaps the code does or could be fixed to make sure the frame->prev field gets set to NULL in that case). */ print_frame_info (fp_opts, fi, 1, LOCATION, 1, 0); if ((flags & PRINT_LOCALS) != 0) { struct frame_id frame_id = get_frame_id (fi); print_frame_local_vars (fi, false, NULL, NULL, 1, gdb_stdout); /* print_frame_local_vars invalidates FI. */ fi = frame_find_by_id (frame_id); if (fi == NULL) { trailing = NULL; warning (_("Unable to restore previously selected frame.")); break; } } /* Save the last frame to check for error conditions. */ trailing = fi; } /* If we've stopped before the end, mention that. */ if (fi && from_tty) printf_filtered (_("(More stack frames follow...)\n")); /* If we've run out of frames, and the reason appears to be an error condition, print it. */ if (fi == NULL && trailing != NULL) { enum unwind_stop_reason reason; reason = get_frame_unwind_stop_reason (trailing); if (reason >= UNWIND_FIRST_ERROR) printf_filtered (_("Backtrace stopped: %s\n"), frame_stop_reason_string (trailing)); } } } /* Create an option_def_group array grouping all the "backtrace" options, with FP_OPTS, BT_CMD_OPT, SET_BT_OPTS as contexts. */ static inline std::array<gdb::option::option_def_group, 3> make_backtrace_options_def_group (frame_print_options *fp_opts, backtrace_cmd_options *bt_cmd_opts, set_backtrace_options *set_bt_opts) { return {{ { {frame_print_option_defs}, fp_opts }, { {set_backtrace_option_defs}, set_bt_opts }, { {backtrace_command_option_defs}, bt_cmd_opts } }}; } /* Parse the backtrace command's qualifiers. Returns ARG advanced past the qualifiers, if any. BT_CMD_OPTS, if not null, is used to store the parsed qualifiers. */ static const char * parse_backtrace_qualifiers (const char *arg, backtrace_cmd_options *bt_cmd_opts = nullptr) { while (true) { const char *save_arg = arg; std::string this_arg = extract_arg (&arg); if (this_arg.empty ()) return arg; if (subset_compare (this_arg.c_str (), "no-filters")) { if (bt_cmd_opts != nullptr) bt_cmd_opts->no_filters = true; } else if (subset_compare (this_arg.c_str (), "full")) { if (bt_cmd_opts != nullptr) bt_cmd_opts->full = true; } else if (subset_compare (this_arg.c_str (), "hide")) { if (bt_cmd_opts != nullptr) bt_cmd_opts->hide = true; } else { /* Not a recognized qualifier, so stop. */ return save_arg; } } } static void backtrace_command (const char *arg, int from_tty) { frame_print_options fp_opts = user_frame_print_options; backtrace_cmd_options bt_cmd_opts; set_backtrace_options set_bt_opts = user_set_backtrace_options; auto grp = make_backtrace_options_def_group (&fp_opts, &bt_cmd_opts, &set_bt_opts); gdb::option::process_options (&arg, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, grp); /* Parse non-'-'-prefixed qualifiers, for backwards compatibility. */ if (arg != NULL) { arg = parse_backtrace_qualifiers (arg, &bt_cmd_opts); if (*arg == '\0') arg = NULL; } /* These options are handled quite deep in the unwind machinery, so we get to pass them down by swapping globals. */ scoped_restore restore_set_backtrace_options = make_scoped_restore (&user_set_backtrace_options, set_bt_opts); backtrace_command_1 (fp_opts, bt_cmd_opts, arg, from_tty); } /* Completer for the "backtrace" command. */ static void backtrace_command_completer (struct cmd_list_element *ignore, completion_tracker &tracker, const char *text, const char */*word*/) { const auto group = make_backtrace_options_def_group (nullptr, nullptr, nullptr); if (gdb::option::complete_options (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group)) return; if (*text != '\0') { const char *p = skip_to_space (text); if (*p == '\0') { static const char *const backtrace_cmd_qualifier_choices[] = { "full", "no-filters", "hide", nullptr, }; complete_on_enum (tracker, backtrace_cmd_qualifier_choices, text, text); if (tracker.have_completions ()) return; } else { const char *cmd = parse_backtrace_qualifiers (text); tracker.advance_custom_word_point_by (cmd - text); text = cmd; } } const char *word = advance_to_expression_complete_word_point (tracker, text); expression_completer (ignore, tracker, text, word); } /* Iterate over the local variables of a block B, calling CB with CB_DATA. */ static void iterate_over_block_locals (const struct block *b, iterate_over_block_arg_local_vars_cb cb, void *cb_data) { struct block_iterator iter; struct symbol *sym; ALL_BLOCK_SYMBOLS (b, iter, sym) { switch (SYMBOL_CLASS (sym)) { case LOC_LOCAL: case LOC_REGISTER: case LOC_STATIC: case LOC_COMPUTED: case LOC_OPTIMIZED_OUT: if (SYMBOL_IS_ARGUMENT (sym)) break; if (SYMBOL_DOMAIN (sym) == COMMON_BLOCK_DOMAIN) break; (*cb) (SYMBOL_PRINT_NAME (sym), sym, cb_data); break; default: /* Ignore symbols which are not locals. */ break; } } } /* Same, but print labels. */ #if 0 /* Commented out, as the code using this function has also been commented out. FIXME:brobecker/2009-01-13: Find out why the code was commented out in the first place. The discussion introducing this change (2007-12-04: Support lexical blocks and function bodies that occupy non-contiguous address ranges) did not explain why this change was made. */ static int print_block_frame_labels (struct gdbarch *gdbarch, struct block *b, int *have_default, struct ui_file *stream) { struct block_iterator iter; struct symbol *sym; int values_printed = 0; ALL_BLOCK_SYMBOLS (b, iter, sym) { if (strcmp (SYMBOL_LINKAGE_NAME (sym), "default") == 0) { if (*have_default) continue; *have_default = 1; } if (SYMBOL_CLASS (sym) == LOC_LABEL) { struct symtab_and_line sal; struct value_print_options opts; sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0); values_printed = 1; fputs_filtered (SYMBOL_PRINT_NAME (sym), stream); get_user_print_options (&opts); if (opts.addressprint) { fprintf_filtered (stream, " "); fputs_filtered (paddress (gdbarch, SYMBOL_VALUE_ADDRESS (sym)), stream); } fprintf_filtered (stream, " in file %s, line %d\n", sal.symtab->filename, sal.line); } } return values_printed; } #endif /* Iterate over all the local variables in block B, including all its superblocks, stopping when the top-level block is reached. */ void iterate_over_block_local_vars (const struct block *block, iterate_over_block_arg_local_vars_cb cb, void *cb_data) { while (block) { iterate_over_block_locals (block, cb, cb_data); /* After handling the function's top-level block, stop. Don't continue to its superblock, the block of per-file symbols. */ if (BLOCK_FUNCTION (block)) break; block = BLOCK_SUPERBLOCK (block); } } /* Data to be passed around in the calls to the locals and args iterators. */ struct print_variable_and_value_data { gdb::optional<compiled_regex> preg; gdb::optional<compiled_regex> treg; struct frame_id frame_id; int num_tabs; struct ui_file *stream; int values_printed; }; /* The callback for the locals and args iterators. */ static void do_print_variable_and_value (const char *print_name, struct symbol *sym, void *cb_data) { struct print_variable_and_value_data *p = (struct print_variable_and_value_data *) cb_data; struct frame_info *frame; if (p->preg.has_value () && p->preg->exec (SYMBOL_NATURAL_NAME (sym), 0, NULL, 0) != 0) return; if (p->treg.has_value () && !treg_matches_sym_type_name (*p->treg, sym)) return; frame = frame_find_by_id (p->frame_id); if (frame == NULL) { warning (_("Unable to restore previously selected frame.")); return; } print_variable_and_value (print_name, sym, frame, p->stream, p->num_tabs); /* print_variable_and_value invalidates FRAME. */ frame = NULL; p->values_printed = 1; } /* Prepares the regular expression REG from REGEXP. If REGEXP is NULL, it results in an empty regular expression. */ static void prepare_reg (const char *regexp, gdb::optional<compiled_regex> *reg) { if (regexp != NULL) { int cflags = REG_NOSUB | (case_sensitivity == case_sensitive_off ? REG_ICASE : 0); reg->emplace (regexp, cflags, _("Invalid regexp")); } else reg->reset (); } /* Print all variables from the innermost up to the function block of FRAME. Print them with values to STREAM indented by NUM_TABS. If REGEXP is not NULL, only print local variables whose name matches REGEXP. If T_REGEXP is not NULL, only print local variables whose type matches T_REGEXP. If no local variables have been printed and !QUIET, prints a message explaining why no local variables could be printed. This function will invalidate FRAME. */ static void print_frame_local_vars (struct frame_info *frame, bool quiet, const char *regexp, const char *t_regexp, int num_tabs, struct ui_file *stream) { struct print_variable_and_value_data cb_data; const struct block *block; CORE_ADDR pc; if (!get_frame_pc_if_available (frame, &pc)) { if (!quiet) fprintf_filtered (stream, _("PC unavailable, cannot determine locals.\n")); return; } block = get_frame_block (frame, 0); if (block == 0) { if (!quiet) fprintf_filtered (stream, "No symbol table info available.\n"); return; } prepare_reg (regexp, &cb_data.preg); prepare_reg (t_regexp, &cb_data.treg); cb_data.frame_id = get_frame_id (frame); cb_data.num_tabs = 4 * num_tabs; cb_data.stream = stream; cb_data.values_printed = 0; /* Temporarily change the selected frame to the given FRAME. This allows routines that rely on the selected frame instead of being given a frame as parameter to use the correct frame. */ scoped_restore_selected_frame restore_selected_frame; select_frame (frame); iterate_over_block_local_vars (block, do_print_variable_and_value, &cb_data); if (!cb_data.values_printed && !quiet) { if (regexp == NULL && t_regexp == NULL) fprintf_filtered (stream, _("No locals.\n")); else fprintf_filtered (stream, _("No matching locals.\n")); } } /* Implement the 'info locals' command. */ void info_locals_command (const char *args, int from_tty) { info_print_options opts; extract_info_print_options (&opts, &args); print_frame_local_vars (get_selected_frame (_("No frame selected.")), opts.quiet, args, opts.type_regexp, 0, gdb_stdout); } /* Iterate over all the argument variables in block B. */ void iterate_over_block_arg_vars (const struct block *b, iterate_over_block_arg_local_vars_cb cb, void *cb_data) { struct block_iterator iter; struct symbol *sym, *sym2; ALL_BLOCK_SYMBOLS (b, iter, sym) { /* Don't worry about things which aren't arguments. */ if (SYMBOL_IS_ARGUMENT (sym)) { /* We have to look up the symbol because arguments can have two entries (one a parameter, one a local) and the one we want is the local, which lookup_symbol will find for us. This includes gcc1 (not gcc2) on the sparc when passing a small structure and gcc2 when the argument type is float and it is passed as a double and converted to float by the prologue (in the latter case the type of the LOC_ARG symbol is double and the type of the LOC_LOCAL symbol is float). There are also LOC_ARG/LOC_REGISTER pairs which are not combined in symbol-reading. */ sym2 = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym), b, VAR_DOMAIN).symbol; (*cb) (SYMBOL_PRINT_NAME (sym), sym2, cb_data); } } } /* Print all argument variables of the function of FRAME. Print them with values to STREAM. If REGEXP is not NULL, only print argument variables whose name matches REGEXP. If T_REGEXP is not NULL, only print argument variables whose type matches T_REGEXP. If no argument variables have been printed and !QUIET, prints a message explaining why no argument variables could be printed. This function will invalidate FRAME. */ static void print_frame_arg_vars (struct frame_info *frame, bool quiet, const char *regexp, const char *t_regexp, struct ui_file *stream) { struct print_variable_and_value_data cb_data; struct symbol *func; CORE_ADDR pc; gdb::optional<compiled_regex> preg; gdb::optional<compiled_regex> treg; if (!get_frame_pc_if_available (frame, &pc)) { if (!quiet) fprintf_filtered (stream, _("PC unavailable, cannot determine args.\n")); return; } func = get_frame_function (frame); if (func == NULL) { if (!quiet) fprintf_filtered (stream, _("No symbol table info available.\n")); return; } prepare_reg (regexp, &cb_data.preg); prepare_reg (t_regexp, &cb_data.treg); cb_data.frame_id = get_frame_id (frame); cb_data.num_tabs = 0; cb_data.stream = stream; cb_data.values_printed = 0; iterate_over_block_arg_vars (SYMBOL_BLOCK_VALUE (func), do_print_variable_and_value, &cb_data); /* do_print_variable_and_value invalidates FRAME. */ frame = NULL; if (!cb_data.values_printed && !quiet) { if (regexp == NULL && t_regexp == NULL) fprintf_filtered (stream, _("No arguments.\n")); else fprintf_filtered (stream, _("No matching arguments.\n")); } } /* Implement the 'info args' command. */ void info_args_command (const char *args, int from_tty) { info_print_options opts; extract_info_print_options (&opts, &args); print_frame_arg_vars (get_selected_frame (_("No frame selected.")), opts.quiet, args, opts.type_regexp, gdb_stdout); } /* Return the symbol-block in which the selected frame is executing. Can return zero under various legitimate circumstances. If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant code address within the block returned. We use this to decide which macros are in scope. */ const struct block * get_selected_block (CORE_ADDR *addr_in_block) { if (!has_stack_frames ()) return 0; return get_frame_block (get_selected_frame (NULL), addr_in_block); } /* Find a frame a certain number of levels away from FRAME. LEVEL_OFFSET_PTR points to an int containing the number of levels. Positive means go to earlier frames (up); negative, the reverse. The int that contains the number of levels is counted toward zero as the frames for those levels are found. If the top or bottom frame is reached, that frame is returned, but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates how much farther the original request asked to go. */ struct frame_info * find_relative_frame (struct frame_info *frame, int *level_offset_ptr) { /* Going up is simple: just call get_prev_frame enough times or until the initial frame is reached. */ while (*level_offset_ptr > 0) { struct frame_info *prev = get_prev_frame (frame); if (!prev) break; (*level_offset_ptr)--; frame = prev; } /* Going down is just as simple. */ while (*level_offset_ptr < 0) { struct frame_info *next = get_next_frame (frame); if (!next) break; (*level_offset_ptr)++; frame = next; } return frame; } /* Select the frame up one or COUNT_EXP stack levels from the previously selected frame, and print it briefly. */ static void up_silently_base (const char *count_exp) { struct frame_info *frame; int count = 1; if (count_exp) count = parse_and_eval_long (count_exp); frame = find_relative_frame (get_selected_frame ("No stack."), &count); if (count != 0 && count_exp == NULL) error (_("Initial frame selected; you cannot go up.")); select_frame (frame); } static void up_silently_command (const char *count_exp, int from_tty) { up_silently_base (count_exp); } static void up_command (const char *count_exp, int from_tty) { up_silently_base (count_exp); gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME); } /* Select the frame down one or COUNT_EXP stack levels from the previously selected frame, and print it briefly. */ static void down_silently_base (const char *count_exp) { struct frame_info *frame; int count = -1; if (count_exp) count = -parse_and_eval_long (count_exp); frame = find_relative_frame (get_selected_frame ("No stack."), &count); if (count != 0 && count_exp == NULL) { /* We only do this if COUNT_EXP is not specified. That way "down" means to really go down (and let me know if that is impossible), but "down 9999" can be used to mean go all the way down without getting an error. */ error (_("Bottom (innermost) frame selected; you cannot go down.")); } select_frame (frame); } static void down_silently_command (const char *count_exp, int from_tty) { down_silently_base (count_exp); } static void down_command (const char *count_exp, int from_tty) { down_silently_base (count_exp); gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME); } void return_command (const char *retval_exp, int from_tty) { /* Initialize it just to avoid a GCC false warning. */ enum return_value_convention rv_conv = RETURN_VALUE_STRUCT_CONVENTION; struct frame_info *thisframe; struct gdbarch *gdbarch; struct symbol *thisfun; struct value *return_value = NULL; struct value *function = NULL; const char *query_prefix = ""; thisframe = get_selected_frame ("No selected frame."); thisfun = get_frame_function (thisframe); gdbarch = get_frame_arch (thisframe); if (get_frame_type (get_current_frame ()) == INLINE_FRAME) error (_("Can not force return from an inlined function.")); /* Compute the return value. If the computation triggers an error, let it bail. If the return type can't be handled, set RETURN_VALUE to NULL, and QUERY_PREFIX to an informational message. */ if (retval_exp) { expression_up retval_expr = parse_expression (retval_exp); struct type *return_type = NULL; /* Compute the return value. Should the computation fail, this call throws an error. */ return_value = evaluate_expression (retval_expr.get ()); /* Cast return value to the return type of the function. Should the cast fail, this call throws an error. */ if (thisfun != NULL) return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun)); if (return_type == NULL) { if (retval_expr->elts[0].opcode != UNOP_CAST && retval_expr->elts[0].opcode != UNOP_CAST_TYPE) error (_("Return value type not available for selected " "stack frame.\n" "Please use an explicit cast of the value to return.")); return_type = value_type (return_value); } return_type = check_typedef (return_type); return_value = value_cast (return_type, return_value); /* Make sure the value is fully evaluated. It may live in the stack frame we're about to pop. */ if (value_lazy (return_value)) value_fetch_lazy (return_value); if (thisfun != NULL) function = read_var_value (thisfun, NULL, thisframe); rv_conv = RETURN_VALUE_REGISTER_CONVENTION; if (TYPE_CODE (return_type) == TYPE_CODE_VOID) /* If the return-type is "void", don't try to find the return-value's location. However, do still evaluate the return expression so that, even when the expression result is discarded, side effects such as "return i++" still occur. */ return_value = NULL; else if (thisfun != NULL) { rv_conv = struct_return_convention (gdbarch, function, return_type); if (rv_conv == RETURN_VALUE_STRUCT_CONVENTION || rv_conv == RETURN_VALUE_ABI_RETURNS_ADDRESS) { query_prefix = "The location at which to store the " "function's return value is unknown.\n" "If you continue, the return value " "that you specified will be ignored.\n"; return_value = NULL; } } } /* Does an interactive user really want to do this? Include information, such as how well GDB can handle the return value, in the query message. */ if (from_tty) { int confirmed; if (thisfun == NULL) confirmed = query (_("%sMake selected stack frame return now? "), query_prefix); else { if (TYPE_NO_RETURN (thisfun->type)) warning (_("Function does not return normally to caller.")); confirmed = query (_("%sMake %s return now? "), query_prefix, SYMBOL_PRINT_NAME (thisfun)); } if (!confirmed) error (_("Not confirmed")); } /* Discard the selected frame and all frames inner-to it. */ frame_pop (get_selected_frame (NULL)); /* Store RETURN_VALUE in the just-returned register set. */ if (return_value != NULL) { struct type *return_type = value_type (return_value); struct gdbarch *cache_arch = get_current_regcache ()->arch (); gdb_assert (rv_conv != RETURN_VALUE_STRUCT_CONVENTION && rv_conv != RETURN_VALUE_ABI_RETURNS_ADDRESS); gdbarch_return_value (cache_arch, function, return_type, get_current_regcache (), NULL /*read*/, value_contents (return_value) /*write*/); } /* If we are at the end of a call dummy now, pop the dummy frame too. */ if (get_frame_type (get_current_frame ()) == DUMMY_FRAME) frame_pop (get_current_frame ()); select_frame (get_current_frame ()); /* If interactive, print the frame that is now current. */ if (from_tty) print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); } /* Find the most inner frame in the current stack for a function called FUNCTION_NAME. If no matching frame is found return NULL. */ static struct frame_info * find_frame_for_function (const char *function_name) { /* Used to hold the lower and upper addresses for each of the SYMTAB_AND_LINEs found for functions matching FUNCTION_NAME. */ struct function_bounds { CORE_ADDR low, high; }; struct frame_info *frame; bool found = false; int level = 1; gdb_assert (function_name != NULL); frame = get_current_frame (); std::vector<symtab_and_line> sals = decode_line_with_current_source (function_name, DECODE_LINE_FUNFIRSTLINE); gdb::def_vector<function_bounds> func_bounds (sals.size ()); for (size_t i = 0; i < sals.size (); i++) { if (sals[i].pspace != current_program_space) func_bounds[i].low = func_bounds[i].high = 0; else if (sals[i].pc == 0 || find_pc_partial_function (sals[i].pc, NULL, &func_bounds[i].low, &func_bounds[i].high) == 0) func_bounds[i].low = func_bounds[i].high = 0; } do { for (size_t i = 0; (i < sals.size () && !found); i++) found = (get_frame_pc (frame) >= func_bounds[i].low && get_frame_pc (frame) < func_bounds[i].high); if (!found) { level = 1; frame = find_relative_frame (frame, &level); } } while (!found && level == 0); if (!found) frame = NULL; return frame; } /* Implements the dbx 'func' command. */ static void func_command (const char *arg, int from_tty) { if (arg == NULL) return; struct frame_info *frame = find_frame_for_function (arg); if (frame == NULL) error (_("'%s' not within current stack frame."), arg); if (frame != get_selected_frame (NULL)) { select_frame (frame); print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); } } /* The qcs command line flags for the "frame apply" commands. Keep this in sync with the "thread apply" commands. */ using qcs_flag_option_def = gdb::option::flag_option_def<qcs_flags>; static const gdb::option::option_def fr_qcs_flags_option_defs[] = { qcs_flag_option_def { "q", [] (qcs_flags *opt) { return &opt->quiet; }, N_("Disables printing the frame location information."), }, qcs_flag_option_def { "c", [] (qcs_flags *opt) { return &opt->cont; }, N_("Print any error raised by COMMAND and continue."), }, qcs_flag_option_def { "s", [] (qcs_flags *opt) { return &opt->silent; }, N_("Silently ignore any errors or empty output produced by COMMAND."), }, }; /* Create an option_def_group array for all the "frame apply" options, with FLAGS and SET_BT_OPTS as context. */ static inline std::array<gdb::option::option_def_group, 2> make_frame_apply_options_def_group (qcs_flags *flags, set_backtrace_options *set_bt_opts) { return {{ { {fr_qcs_flags_option_defs}, flags }, { {set_backtrace_option_defs}, set_bt_opts }, }}; } /* Apply a GDB command to all stack frames, or a set of identified frames, or innermost COUNT frames. With a negative COUNT, apply command on outermost -COUNT frames. frame apply 3 info frame Apply 'info frame' to frames 0, 1, 2 frame apply -3 info frame Apply 'info frame' to outermost 3 frames. frame apply all x/i $pc Apply 'x/i $pc' cmd to all frames. frame apply all -s p local_var_no_idea_in_which_frame If a frame has a local variable called local_var_no_idea_in_which_frame, print frame and value of local_var_no_idea_in_which_frame. frame apply all -s -q p local_var_no_idea_in_which_frame Same as before, but only print the variable value. frame apply level 2-5 0 4-7 -s p i = i + 1 Adds 1 to the variable i in the specified frames. Note that i will be incremented twice in frames 4 and 5. */ /* Apply a GDB command to COUNT stack frames, starting at TRAILING. CMD starts with 0 or more qcs flags followed by the GDB command to apply. COUNT -1 means all frames starting at TRAILING. WHICH_COMMAND is used for error messages. */ static void frame_apply_command_count (const char *which_command, const char *cmd, int from_tty, struct frame_info *trailing, int count) { qcs_flags flags; set_backtrace_options set_bt_opts = user_set_backtrace_options; auto group = make_frame_apply_options_def_group (&flags, &set_bt_opts); gdb::option::process_options (&cmd, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group); validate_flags_qcs (which_command, &flags); if (cmd == NULL || *cmd == '\0') error (_("Please specify a command to apply on the selected frames")); /* The below will restore the current inferior/thread/frame. Usually, only the frame is effectively to be restored. But in case CMD switches of inferior/thread, better restore these also. */ scoped_restore_current_thread restore_thread; /* These options are handled quite deep in the unwind machinery, so we get to pass them down by swapping globals. */ scoped_restore restore_set_backtrace_options = make_scoped_restore (&user_set_backtrace_options, set_bt_opts); for (frame_info *fi = trailing; fi && count--; fi = get_prev_frame (fi)) { QUIT; select_frame (fi); try { std::string cmd_result; { /* In case CMD switches of inferior/thread/frame, the below restores the inferior/thread/frame. FI can then be set to the selected frame. */ scoped_restore_current_thread restore_fi_current_frame; cmd_result = execute_command_to_string (cmd, from_tty, gdb_stdout->term_out ()); } fi = get_selected_frame (_("frame apply " "unable to get selected frame.")); if (!flags.silent || cmd_result.length () > 0) { if (!flags.quiet) print_stack_frame (fi, 1, LOCATION, 0); printf_filtered ("%s", cmd_result.c_str ()); } } catch (const gdb_exception_error &ex) { fi = get_selected_frame (_("frame apply " "unable to get selected frame.")); if (!flags.silent) { if (!flags.quiet) print_stack_frame (fi, 1, LOCATION, 0); if (flags.cont) printf_filtered ("%s\n", ex.what ()); else throw; } } } } /* Completer for the "frame apply ..." commands. */ static void frame_apply_completer (completion_tracker &tracker, const char *text) { const auto group = make_frame_apply_options_def_group (nullptr, nullptr); if (gdb::option::complete_options (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_OPERAND, group)) return; complete_nested_command_line (tracker, text); } /* Completer for the "frame apply" commands. */ static void frame_apply_level_cmd_completer (struct cmd_list_element *ignore, completion_tracker &tracker, const char *text, const char */*word*/) { /* Do this explicitly because there's an early return below. */ tracker.set_use_custom_word_point (true); number_or_range_parser levels (text); /* Skip the LEVEL list to find the options and command args. */ try { while (!levels.finished ()) { /* Call for effect. */ levels.get_number (); if (levels.in_range ()) levels.skip_range (); } } catch (const gdb_exception_error &ex) { /* get_number throws if it parses a negative number, for example. But a seemingly negative number may be the start of an option instead. */ } const char *cmd = levels.cur_tok (); if (cmd == text) { /* No level list yet. */ return; } /* Check if we're past a valid LEVEL already. */ if (levels.finished () && cmd > text && !isspace (cmd[-1])) return; /* We're past LEVELs, advance word point. */ tracker.advance_custom_word_point_by (cmd - text); text = cmd; frame_apply_completer (tracker, text); } /* Completer for the "frame apply all" command. */ void frame_apply_all_cmd_completer (struct cmd_list_element *ignore, completion_tracker &tracker, const char *text, const char */*word*/) { frame_apply_completer (tracker, text); } /* Completer for the "frame apply COUNT" command. */ static void frame_apply_cmd_completer (struct cmd_list_element *ignore, completion_tracker &tracker, const char *text, const char */*word*/) { const char *cmd = text; int count = get_number_trailer (&cmd, 0); if (count == 0) return; /* Check if we're past a valid COUNT already. */ if (cmd > text && !isspace (cmd[-1])) return; /* We're past COUNT, advance word point. */ tracker.advance_custom_word_point_by (cmd - text); text = cmd; frame_apply_completer (tracker, text); } /* Implementation of the "frame apply level" command. */ static void frame_apply_level_command (const char *cmd, int from_tty) { if (!target_has_stack) error (_("No stack.")); bool level_found = false; const char *levels_str = cmd; number_or_range_parser levels (levels_str); /* Skip the LEVEL list to find the flags and command args. */ while (!levels.finished ()) { /* Call for effect. */ levels.get_number (); level_found = true; if (levels.in_range ()) levels.skip_range (); } if (!level_found) error (_("Missing or invalid LEVEL... argument")); cmd = levels.cur_tok (); /* Redo the LEVELS parsing, but applying COMMAND. */ levels.init (levels_str); while (!levels.finished ()) { const int level_beg = levels.get_number (); int n_frames; if (levels.in_range ()) { n_frames = levels.end_value () - level_beg + 1; levels.skip_range (); } else n_frames = 1; frame_apply_command_count ("frame apply level", cmd, from_tty, leading_innermost_frame (level_beg), n_frames); } } /* Implementation of the "frame apply all" command. */ static void frame_apply_all_command (const char *cmd, int from_tty) { if (!target_has_stack) error (_("No stack.")); frame_apply_command_count ("frame apply all", cmd, from_tty, get_current_frame (), INT_MAX); } /* Implementation of the "frame apply" command. */ static void frame_apply_command (const char* cmd, int from_tty) { int count; struct frame_info *trailing; if (!target_has_stack) error (_("No stack.")); if (cmd == NULL) error (_("Missing COUNT argument.")); count = get_number_trailer (&cmd, 0); if (count == 0) error (_("Invalid COUNT argument.")); if (count < 0) { trailing = trailing_outermost_frame (-count); count = -1; } else trailing = get_current_frame (); frame_apply_command_count ("frame apply", cmd, from_tty, trailing, count); } /* Implementation of the "faas" command. */ static void faas_command (const char *cmd, int from_tty) { std::string expanded = std::string ("frame apply all -s ") + cmd; execute_command (expanded.c_str (), from_tty); } /* Find inner-mode frame with frame address ADDRESS. Return NULL if no matching frame can be found. */ static struct frame_info * find_frame_for_address (CORE_ADDR address) { struct frame_id id; struct frame_info *fid; id = frame_id_build_wild (address); /* If (s)he specifies the frame with an address, he deserves what (s)he gets. Still, give the highest one that matches. (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't know). */ for (fid = get_current_frame (); fid != NULL; fid = get_prev_frame (fid)) { if (frame_id_eq (id, get_frame_id (fid))) { struct frame_info *prev_frame; while (1) { prev_frame = get_prev_frame (fid); if (!prev_frame || !frame_id_eq (id, get_frame_id (prev_frame))) break; fid = prev_frame; } return fid; } } return NULL; } /* Commands with a prefix of `frame apply'. */ static struct cmd_list_element *frame_apply_cmd_list = NULL; /* Commands with a prefix of `frame'. */ static struct cmd_list_element *frame_cmd_list = NULL; /* Commands with a prefix of `select frame'. */ static struct cmd_list_element *select_frame_cmd_list = NULL; /* Commands with a prefix of `info frame'. */ static struct cmd_list_element *info_frame_cmd_list = NULL; void _initialize_stack (void) { struct cmd_list_element *cmd; add_com ("return", class_stack, return_command, _("\ Make selected stack frame return to its caller.\n\ Control remains in the debugger, but when you continue\n\ execution will resume in the frame above the one now selected.\n\ If an argument is given, it is an expression for the value to return.")); add_com ("up", class_stack, up_command, _("\ Select and print stack frame that called this one.\n\ An argument says how many frames up to go.")); add_com ("up-silently", class_support, up_silently_command, _("\ Same as the `up' command, but does not print anything.\n\ This is useful in command scripts.")); add_com ("down", class_stack, down_command, _("\ Select and print stack frame called by this one.\n\ An argument says how many frames down to go.")); add_com_alias ("do", "down", class_stack, 1); add_com_alias ("dow", "down", class_stack, 1); add_com ("down-silently", class_support, down_silently_command, _("\ Same as the `down' command, but does not print anything.\n\ This is useful in command scripts.")); add_prefix_cmd ("frame", class_stack, &frame_cmd.base_command, _("\ Select and print a stack frame.\n\ With no argument, print the selected stack frame. (See also \"info frame\").\n\ A single numerical argument specifies the frame to select."), &frame_cmd_list, "frame ", 1, &cmdlist); add_com_alias ("f", "frame", class_stack, 1); #define FRAME_APPLY_OPTION_HELP "\ Prints the frame location information followed by COMMAND output.\n\ \n\ By default, an error raised during the execution of COMMAND\n\ aborts \"frame apply\".\n\ \n\ Options:\n\ %OPTIONS%" const auto frame_apply_opts = make_frame_apply_options_def_group (nullptr, nullptr); static std::string frame_apply_cmd_help = gdb::option::build_help (N_("\ Apply a command to a number of frames.\n\ Usage: frame apply COUNT [OPTION]... COMMAND\n\ With a negative COUNT argument, applies the command on outermost -COUNT frames.\n" FRAME_APPLY_OPTION_HELP), frame_apply_opts); cmd = add_prefix_cmd ("apply", class_stack, frame_apply_command, frame_apply_cmd_help.c_str (), &frame_apply_cmd_list, "frame apply ", 1, &frame_cmd_list); set_cmd_completer_handle_brkchars (cmd, frame_apply_cmd_completer); static std::string frame_apply_all_cmd_help = gdb::option::build_help (N_("\ Apply a command to all frames.\n\ \n\ Usage: frame apply all [OPTION]... COMMAND\n" FRAME_APPLY_OPTION_HELP), frame_apply_opts); cmd = add_cmd ("all", class_stack, frame_apply_all_command, frame_apply_all_cmd_help.c_str (), &frame_apply_cmd_list); set_cmd_completer_handle_brkchars (cmd, frame_apply_all_cmd_completer); static std::string frame_apply_level_cmd_help = gdb::option::build_help (N_("\ Apply a command to a list of frames.\n\ \n\ Usage: frame apply level LEVEL... [OPTION]... COMMAND\n\ LEVEL is a space-separated list of levels of frames to apply COMMAND on.\n" FRAME_APPLY_OPTION_HELP), frame_apply_opts); cmd = add_cmd ("level", class_stack, frame_apply_level_command, frame_apply_level_cmd_help.c_str (), &frame_apply_cmd_list); set_cmd_completer_handle_brkchars (cmd, frame_apply_level_cmd_completer); cmd = add_com ("faas", class_stack, faas_command, _("\ Apply a command to all frames (ignoring errors and empty output).\n\ Usage: faas [OPTION]... COMMAND\n\ shortcut for 'frame apply all -s [OPTION]... COMMAND'\n\ See \"help frame apply all\" for available options.")); set_cmd_completer_handle_brkchars (cmd, frame_apply_all_cmd_completer); add_prefix_cmd ("frame", class_stack, &frame_cmd.base_command, _("\ Select and print a stack frame.\n\ With no argument, print the selected stack frame. (See also \"info frame\").\n\ A single numerical argument specifies the frame to select."), &frame_cmd_list, "frame ", 1, &cmdlist); add_com_alias ("f", "frame", class_stack, 1); add_cmd ("address", class_stack, &frame_cmd.address, _("\ Select and print a stack frame by stack address\n\ \n\ Usage: frame address STACK-ADDRESS"), &frame_cmd_list); add_cmd ("view", class_stack, &frame_cmd.view, _("\ View a stack frame that might be outside the current backtrace.\n\ \n\ Usage: frame view STACK-ADDRESS\n\ frame view STACK-ADDRESS PC-ADDRESS"), &frame_cmd_list); cmd = add_cmd ("function", class_stack, &frame_cmd.function, _("\ Select and print a stack frame by function name.\n\ \n\ Usage: frame function NAME\n\ \n\ The innermost frame that visited function NAME is selected."), &frame_cmd_list); set_cmd_completer (cmd, frame_selection_by_function_completer); add_cmd ("level", class_stack, &frame_cmd.level, _("\ Select and print a stack frame by level.\n\ \n\ Usage: frame level LEVEL"), &frame_cmd_list); cmd = add_prefix_cmd_suppress_notification ("select-frame", class_stack, &select_frame_cmd.base_command, _("\ Select a stack frame without printing anything.\n\ A single numerical argument specifies the frame to select."), &select_frame_cmd_list, "select-frame ", 1, &cmdlist, &cli_suppress_notification.user_selected_context); add_cmd_suppress_notification ("address", class_stack, &select_frame_cmd.address, _("\ Select a stack frame by stack address.\n\ \n\ Usage: select-frame address STACK-ADDRESS"), &select_frame_cmd_list, &cli_suppress_notification.user_selected_context); add_cmd_suppress_notification ("view", class_stack, &select_frame_cmd.view, _("\ Select a stack frame that might be outside the current backtrace.\n\ \n\ Usage: select-frame view STACK-ADDRESS\n\ select-frame view STACK-ADDRESS PC-ADDRESS"), &select_frame_cmd_list, &cli_suppress_notification.user_selected_context); cmd = add_cmd_suppress_notification ("function", class_stack, &select_frame_cmd.function, _("\ Select a stack frame by function name.\n\ \n\ Usage: select-frame function NAME"), &select_frame_cmd_list, &cli_suppress_notification.user_selected_context); set_cmd_completer (cmd, frame_selection_by_function_completer); add_cmd_suppress_notification ("level", class_stack, &select_frame_cmd.level, _("\ Select a stack frame by level.\n\ \n\ Usage: select-frame level LEVEL"), &select_frame_cmd_list, &cli_suppress_notification.user_selected_context); const auto backtrace_opts = make_backtrace_options_def_group (nullptr, nullptr, nullptr); static std::string backtrace_help = gdb::option::build_help (N_("\ Print backtrace of all stack frames, or innermost COUNT frames.\n\ Usage: backtrace [OPTION]... [QUALIFIER]... [COUNT | -COUNT]\n\ \n\ Options:\n\ %OPTIONS%\ For backward compatibility, the following qualifiers are supported:\n\ \n\ full - same as -full option.\n\ no-filters - same as -no-filters option.\n\ hide - same as -hide.\n\ \n\ With a negative COUNT, print outermost -COUNT frames."), backtrace_opts); cmd_list_element *c = add_com ("backtrace", class_stack, backtrace_command, backtrace_help.c_str ()); set_cmd_completer_handle_brkchars (c, backtrace_command_completer); add_com_alias ("bt", "backtrace", class_stack, 0); add_com_alias ("where", "backtrace", class_alias, 0); add_info ("stack", backtrace_command, _("Backtrace of the stack, or innermost COUNT frames.")); add_info_alias ("s", "stack", 1); add_prefix_cmd ("frame", class_info, &info_frame_cmd.base_command, _("All about the selected stack frame.\n\ With no arguments, displays information about the currently selected stack\n\ frame. Alternatively a frame specification may be provided (See \"frame\")\n\ the information is then printed about the specified frame."), &info_frame_cmd_list, "info frame ", 1, &infolist); add_info_alias ("f", "frame", 1); add_cmd ("address", class_stack, &info_frame_cmd.address, _("\ Print information about a stack frame selected by stack address.\n\ \n\ Usage: info frame address STACK-ADDRESS"), &info_frame_cmd_list); add_cmd ("view", class_stack, &info_frame_cmd.view, _("\ Print information about a stack frame outside the current backtrace.\n\ \n\ Usage: info frame view STACK-ADDRESS\n\ info frame view STACK-ADDRESS PC-ADDRESS"), &info_frame_cmd_list); cmd = add_cmd ("function", class_stack, &info_frame_cmd.function, _("\ Print information about a stack frame selected by function name.\n\ \n\ Usage: info frame function NAME"), &info_frame_cmd_list); set_cmd_completer (cmd, frame_selection_by_function_completer); add_cmd ("level", class_stack, &info_frame_cmd.level, _("\ Print information about a stack frame selected by level.\n\ \n\ Usage: info frame level LEVEL"), &info_frame_cmd_list); cmd = add_info ("locals", info_locals_command, info_print_args_help (_("\ All local variables of current stack frame or those matching REGEXPs.\n\ Usage: info locals [-q] [-t TYPEREGEXP] [NAMEREGEXP]\n\ Prints the local variables of the current stack frame.\n"), _("local variables"))); set_cmd_completer_handle_brkchars (cmd, info_print_command_completer); cmd = add_info ("args", info_args_command, info_print_args_help (_("\ All argument variables of current stack frame or those matching REGEXPs.\n\ Usage: info args [-q] [-t TYPEREGEXP] [NAMEREGEXP]\n\ Prints the argument variables of the current stack frame.\n"), _("argument variables"))); set_cmd_completer_handle_brkchars (cmd, info_print_command_completer); if (dbx_commands) add_com ("func", class_stack, func_command, _("\ Select the stack frame that contains NAME.\n\ Usage: func NAME")); /* Install "set print raw frame-arguments", a deprecated spelling of "set print raw-frame-arguments". */ cmd = add_setshow_boolean_cmd ("frame-arguments", no_class, &user_frame_print_options.print_raw_frame_arguments, _("\ Set whether to print frame arguments in raw form."), _("\ Show whether to print frame arguments in raw form."), _("\ If set, frame arguments are printed in raw form, bypassing any\n\ pretty-printers for that value."), NULL, NULL, &setprintrawlist, &showprintrawlist); deprecate_cmd (cmd, "set print raw-frame-arguments"); add_setshow_auto_boolean_cmd ("disassemble-next-line", class_stack, &disassemble_next_line, _("\ Set whether to disassemble next source line or insn when execution stops."), _("\ Show whether to disassemble next source line or insn when execution stops."), _("\ If ON, GDB will display disassembly of the next source line, in addition\n\ to displaying the source line itself. If the next source line cannot\n\ be displayed (e.g., source is unavailable or there's no line info), GDB\n\ will display disassembly of next instruction instead of showing the\n\ source line.\n\ If AUTO, display disassembly of next instruction only if the source line\n\ cannot be displayed.\n\ If OFF (which is the default), never display the disassembly of the next\n\ source line."), NULL, show_disassemble_next_line, &setlist, &showlist); disassemble_next_line = AUTO_BOOLEAN_FALSE; gdb::option::add_setshow_cmds_for_options (class_stack, &user_frame_print_options, frame_print_option_defs, &setprintlist, &showprintlist); }