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/* Everything about breakpoints, for GDB. Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 "arch-utils.h" #include <ctype.h> #include "hashtab.h" #include "symtab.h" #include "frame.h" #include "breakpoint.h" #include "tracepoint.h" #include "gdbtypes.h" #include "expression.h" #include "gdbcore.h" #include "gdbcmd.h" #include "value.h" #include "command.h" #include "inferior.h" #include "gdbthread.h" #include "target.h" #include "language.h" #include "gdb_string.h" #include "demangle.h" #include "annotate.h" #include "symfile.h" #include "objfiles.h" #include "source.h" #include "linespec.h" #include "completer.h" #include "gdb.h" #include "ui-out.h" #include "cli/cli-script.h" #include "gdb_assert.h" #include "block.h" #include "solib.h" #include "solist.h" #include "observer.h" #include "exceptions.h" #include "memattr.h" #include "ada-lang.h" #include "top.h" #include "wrapper.h" #include "valprint.h" #include "jit.h" #include "xml-syscall.h" /* readline include files */ #include "readline/readline.h" #include "readline/history.h" /* readline defines this. */ #undef savestring #include "mi/mi-common.h" /* Arguments to pass as context to some catch command handlers. */ #define CATCH_PERMANENT ((void *) (uintptr_t) 0) #define CATCH_TEMPORARY ((void *) (uintptr_t) 1) /* Prototypes for local functions. */ static void enable_delete_command (char *, int); static void enable_delete_breakpoint (struct breakpoint *); static void enable_once_command (char *, int); static void enable_once_breakpoint (struct breakpoint *); static void disable_command (char *, int); static void enable_command (char *, int); static void map_breakpoint_numbers (char *, void (*)(struct breakpoint *)); static void ignore_command (char *, int); static int breakpoint_re_set_one (void *); static void clear_command (char *, int); static void catch_command (char *, int); static void watch_command (char *, int); static int can_use_hardware_watchpoint (struct value *); static void break_command_1 (char *, int, int); static void mention (struct breakpoint *); /* This function is used in gdbtk sources and thus can not be made static. */ struct breakpoint *set_raw_breakpoint (struct gdbarch *gdbarch, struct symtab_and_line, enum bptype); static void breakpoint_adjustment_warning (CORE_ADDR, CORE_ADDR, int, int); static CORE_ADDR adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr, enum bptype bptype); static void describe_other_breakpoints (struct gdbarch *, struct program_space *, CORE_ADDR, struct obj_section *, int); static int breakpoint_address_match (struct address_space *aspace1, CORE_ADDR addr1, struct address_space *aspace2, CORE_ADDR addr2); static void breakpoints_info (char *, int); static void breakpoint_1 (int, int); static bpstat bpstat_alloc (const struct bp_location *, bpstat); static int breakpoint_cond_eval (void *); static void cleanup_executing_breakpoints (void *); static void commands_command (char *, int); static void condition_command (char *, int); static int get_number_trailer (char **, int); void set_breakpoint_count (int); typedef enum { mark_inserted, mark_uninserted } insertion_state_t; static int remove_breakpoint (struct bp_location *, insertion_state_t); static int remove_breakpoint_1 (struct bp_location *, insertion_state_t); static enum print_stop_action print_it_typical (bpstat); static enum print_stop_action print_bp_stop_message (bpstat bs); static int watchpoint_check (void *); static void maintenance_info_breakpoints (char *, int); static int hw_breakpoint_used_count (void); static int hw_watchpoint_used_count (enum bptype, int *); static void hbreak_command (char *, int); static void thbreak_command (char *, int); static void watch_command_1 (char *, int, int); static void rwatch_command (char *, int); static void awatch_command (char *, int); static void do_enable_breakpoint (struct breakpoint *, enum bpdisp); static void stop_command (char *arg, int from_tty); static void stopin_command (char *arg, int from_tty); static void stopat_command (char *arg, int from_tty); static char *ep_parse_optional_if_clause (char **arg); static void catch_exception_command_1 (enum exception_event_kind ex_event, char *arg, int tempflag, int from_tty); static void tcatch_command (char *arg, int from_tty); static void ep_skip_leading_whitespace (char **s); static int single_step_breakpoint_inserted_here_p (struct address_space *, CORE_ADDR pc); static void free_bp_location (struct bp_location *loc); static struct bp_location *allocate_bp_location (struct breakpoint *bpt); static void update_global_location_list (int); static void update_global_location_list_nothrow (int); static int is_hardware_watchpoint (struct breakpoint *bpt); static void insert_breakpoint_locations (void); static int syscall_catchpoint_p (struct breakpoint *b); static void tracepoints_info (char *, int); static void delete_trace_command (char *, int); static void enable_trace_command (char *, int); static void disable_trace_command (char *, int); static void trace_pass_command (char *, int); static void skip_prologue_sal (struct symtab_and_line *sal); /* Flag indicating that a command has proceeded the inferior past the current breakpoint. */ static int breakpoint_proceeded; static const char * bpdisp_text (enum bpdisp disp) { /* NOTE: the following values are a part of MI protocol and represent values of 'disp' field returned when inferior stops at a breakpoint. */ static char *bpdisps[] = {"del", "dstp", "dis", "keep"}; return bpdisps[(int) disp]; } /* Prototypes for exported functions. */ /* If FALSE, gdb will not use hardware support for watchpoints, even if such is available. */ static int can_use_hw_watchpoints; static void show_can_use_hw_watchpoints (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { fprintf_filtered (file, _("\ Debugger's willingness to use watchpoint hardware is %s.\n"), value); } /* If AUTO_BOOLEAN_FALSE, gdb will not attempt to create pending breakpoints. If AUTO_BOOLEAN_TRUE, gdb will automatically create pending breakpoints for unrecognized breakpoint locations. If AUTO_BOOLEAN_AUTO, gdb will query when breakpoints are unrecognized. */ static enum auto_boolean pending_break_support; static void show_pending_break_support (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { fprintf_filtered (file, _("\ Debugger's behavior regarding pending breakpoints is %s.\n"), value); } /* If 1, gdb will automatically use hardware breakpoints for breakpoints set with "break" but falling in read-only memory. If 0, gdb will warn about such breakpoints, but won't automatically use hardware breakpoints. */ static int automatic_hardware_breakpoints; static void show_automatic_hardware_breakpoints (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { fprintf_filtered (file, _("\ Automatic usage of hardware breakpoints is %s.\n"), value); } /* If on, gdb will keep breakpoints inserted even as inferior is stopped, and immediately insert any new breakpoints. If off, gdb will insert breakpoints into inferior only when resuming it, and will remove breakpoints upon stop. If auto, GDB will behave as ON if in non-stop mode, and as OFF if all-stop mode.*/ static const char always_inserted_auto[] = "auto"; static const char always_inserted_on[] = "on"; static const char always_inserted_off[] = "off"; static const char *always_inserted_enums[] = { always_inserted_auto, always_inserted_off, always_inserted_on, NULL }; static const char *always_inserted_mode = always_inserted_auto; static void show_always_inserted_mode (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) { if (always_inserted_mode == always_inserted_auto) fprintf_filtered (file, _("\ Always inserted breakpoint mode is %s (currently %s).\n"), value, breakpoints_always_inserted_mode () ? "on" : "off"); else fprintf_filtered (file, _("Always inserted breakpoint mode is %s.\n"), value); } int breakpoints_always_inserted_mode (void) { return (always_inserted_mode == always_inserted_on || (always_inserted_mode == always_inserted_auto && non_stop)); } void _initialize_breakpoint (void); /* Are we executing breakpoint commands? */ static int executing_breakpoint_commands; /* Are overlay event breakpoints enabled? */ static int overlay_events_enabled; /* Walk the following statement or block through all breakpoints. ALL_BREAKPOINTS_SAFE does so even if the statment deletes the current breakpoint. */ #define ALL_BREAKPOINTS(B) for (B = breakpoint_chain; B; B = B->next) #define ALL_BREAKPOINTS_SAFE(B,TMP) \ for (B = breakpoint_chain; \ B ? (TMP=B->next, 1): 0; \ B = TMP) /* Similar iterator for the low-level breakpoints. SAFE variant is not provided so update_global_location_list must not be called while executing the block of ALL_BP_LOCATIONS. */ #define ALL_BP_LOCATIONS(B,BP_TMP) \ for (BP_TMP = bp_location; \ BP_TMP < bp_location + bp_location_count && (B = *BP_TMP); \ BP_TMP++) /* Iterator for tracepoints only. */ #define ALL_TRACEPOINTS(B) \ for (B = breakpoint_chain; B; B = B->next) \ if (tracepoint_type (B)) /* Chains of all breakpoints defined. */ struct breakpoint *breakpoint_chain; /* Array is sorted by bp_location_compare - primarily by the ADDRESS. */ static struct bp_location **bp_location; /* Number of elements of BP_LOCATION. */ static unsigned bp_location_count; /* Maximum alignment offset between bp_target_info.PLACED_ADDRESS and ADDRESS for the current elements of BP_LOCATION which get a valid result from bp_location_has_shadow. You can use it for roughly limiting the subrange of BP_LOCATION to scan for shadow bytes for an address you need to read. */ static CORE_ADDR bp_location_placed_address_before_address_max; /* Maximum offset plus alignment between bp_target_info.PLACED_ADDRESS + bp_target_info.SHADOW_LEN and ADDRESS for the current elements of BP_LOCATION which get a valid result from bp_location_has_shadow. You can use it for roughly limiting the subrange of BP_LOCATION to scan for shadow bytes for an address you need to read. */ static CORE_ADDR bp_location_shadow_len_after_address_max; /* The locations that no longer correspond to any breakpoint, unlinked from bp_location array, but for which a hit may still be reported by a target. */ VEC(bp_location_p) *moribund_locations = NULL; /* Number of last breakpoint made. */ int breakpoint_count; /* Number of last tracepoint made. */ int tracepoint_count; /* Return whether a breakpoint is an active enabled breakpoint. */ static int breakpoint_enabled (struct breakpoint *b) { return (b->enable_state == bp_enabled); } /* Set breakpoint count to NUM. */ void set_breakpoint_count (int num) { breakpoint_count = num; set_internalvar_integer (lookup_internalvar ("bpnum"), num); } /* Used in run_command to zero the hit count when a new run starts. */ void clear_breakpoint_hit_counts (void) { struct breakpoint *b; ALL_BREAKPOINTS (b) b->hit_count = 0; } /* Encapsulate tests for different types of tracepoints. */ static int tracepoint_type (const struct breakpoint *b) { return (b->type == bp_tracepoint || b->type == bp_fast_tracepoint); } /* Default address, symtab and line to put a breakpoint at for "break" command with no arg. if default_breakpoint_valid is zero, the other three are not valid, and "break" with no arg is an error. This set by print_stack_frame, which calls set_default_breakpoint. */ int default_breakpoint_valid; CORE_ADDR default_breakpoint_address; struct symtab *default_breakpoint_symtab; int default_breakpoint_line; struct program_space *default_breakpoint_pspace; /* *PP is a string denoting a breakpoint. Get the number of the breakpoint. Advance *PP after the string and any trailing whitespace. Currently the string can either be a number or "$" followed by the name of a convenience variable. Making it an expression wouldn't work well for map_breakpoint_numbers (e.g. "4 + 5 + 6"). If the string is a NULL pointer, that denotes the last breakpoint. TRAILER is a character which can be found after the number; most commonly this is `-'. If you don't want a trailer, use \0. */ static int get_number_trailer (char **pp, int trailer) { int retval = 0; /* default */ char *p = *pp; if (p == NULL) /* Empty line means refer to the last breakpoint. */ return breakpoint_count; else if (*p == '$') { /* Make a copy of the name, so we can null-terminate it to pass to lookup_internalvar(). */ char *varname; char *start = ++p; LONGEST val; while (isalnum (*p) || *p == '_') p++; varname = (char *) alloca (p - start + 1); strncpy (varname, start, p - start); varname[p - start] = '\0'; if (get_internalvar_integer (lookup_internalvar (varname), &val)) retval = (int) val; else { printf_filtered (_("Convenience variable must have integer value.\n")); retval = 0; } } else { if (*p == '-') ++p; while (*p >= '0' && *p <= '9') ++p; if (p == *pp) /* There is no number here. (e.g. "cond a == b"). */ { /* Skip non-numeric token */ while (*p && !isspace((int) *p)) ++p; /* Return zero, which caller must interpret as error. */ retval = 0; } else retval = atoi (*pp); } if (!(isspace (*p) || *p == '\0' || *p == trailer)) { /* Trailing junk: return 0 and let caller print error msg. */ while (!(isspace (*p) || *p == '\0' || *p == trailer)) ++p; retval = 0; } while (isspace (*p)) p++; *pp = p; return retval; } /* Like get_number_trailer, but don't allow a trailer. */ int get_number (char **pp) { return get_number_trailer (pp, '\0'); } /* Parse a number or a range. * A number will be of the form handled by get_number. * A range will be of the form <number1> - <number2>, and * will represent all the integers between number1 and number2, * inclusive. * * While processing a range, this fuction is called iteratively; * At each call it will return the next value in the range. * * At the beginning of parsing a range, the char pointer PP will * be advanced past <number1> and left pointing at the '-' token. * Subsequent calls will not advance the pointer until the range * is completed. The call that completes the range will advance * pointer PP past <number2>. */ int get_number_or_range (char **pp) { static int last_retval, end_value; static char *end_ptr; static int in_range = 0; if (**pp != '-') { /* Default case: pp is pointing either to a solo number, or to the first number of a range. */ last_retval = get_number_trailer (pp, '-'); if (**pp == '-') { char **temp; /* This is the start of a range (<number1> - <number2>). Skip the '-', parse and remember the second number, and also remember the end of the final token. */ temp = &end_ptr; end_ptr = *pp + 1; while (isspace ((int) *end_ptr)) end_ptr++; /* skip white space */ end_value = get_number (temp); if (end_value < last_retval) { error (_("inverted range")); } else if (end_value == last_retval) { /* degenerate range (number1 == number2). Advance the token pointer so that the range will be treated as a single number. */ *pp = end_ptr; } else in_range = 1; } } else if (! in_range) error (_("negative value")); else { /* pp points to the '-' that betokens a range. All number-parsing has already been done. Return the next integer value (one greater than the saved previous value). Do not advance the token pointer 'pp' until the end of range is reached. */ if (++last_retval == end_value) { /* End of range reached; advance token pointer. */ *pp = end_ptr; in_range = 0; } } return last_retval; } /* Return the breakpoint with the specified number, or NULL if the number does not refer to an existing breakpoint. */ struct breakpoint * get_breakpoint (int num) { struct breakpoint *b; ALL_BREAKPOINTS (b) if (b->number == num) return b; return NULL; } /* condition N EXP -- set break condition of breakpoint N to EXP. */ static void condition_command (char *arg, int from_tty) { struct breakpoint *b; char *p; int bnum; if (arg == 0) error_no_arg (_("breakpoint number")); p = arg; bnum = get_number (&p); if (bnum == 0) error (_("Bad breakpoint argument: '%s'"), arg); ALL_BREAKPOINTS (b) if (b->number == bnum) { struct bp_location *loc = b->loc; for (; loc; loc = loc->next) { if (loc->cond) { xfree (loc->cond); loc->cond = 0; } } if (b->cond_string != NULL) xfree (b->cond_string); if (*p == 0) { b->cond_string = NULL; if (from_tty) printf_filtered (_("Breakpoint %d now unconditional.\n"), bnum); } else { arg = p; /* I don't know if it matters whether this is the string the user typed in or the decompiled expression. */ b->cond_string = xstrdup (arg); b->condition_not_parsed = 0; for (loc = b->loc; loc; loc = loc->next) { arg = p; loc->cond = parse_exp_1 (&arg, block_for_pc (loc->address), 0); if (*arg) error (_("Junk at end of expression")); } } breakpoints_changed (); observer_notify_breakpoint_modified (b->number); return; } error (_("No breakpoint number %d."), bnum); } /* Set the command list of B to COMMANDS. */ void breakpoint_set_commands (struct breakpoint *b, struct command_line *commands) { free_command_lines (&b->commands); b->commands = commands; breakpoints_changed (); observer_notify_breakpoint_modified (b->number); } static void commands_command (char *arg, int from_tty) { struct breakpoint *b; char *p; int bnum; struct command_line *l; /* If we allowed this, we would have problems with when to free the storage, if we change the commands currently being read from. */ if (executing_breakpoint_commands) error (_("Can't use the \"commands\" command among a breakpoint's commands.")); p = arg; bnum = get_number (&p); if (p && *p) error (_("Unexpected extra arguments following breakpoint number.")); ALL_BREAKPOINTS (b) if (b->number == bnum) { char *tmpbuf = xstrprintf ("Type commands for when breakpoint %d is hit, one per line.", bnum); struct cleanup *cleanups = make_cleanup (xfree, tmpbuf); l = read_command_lines (tmpbuf, from_tty, 1); do_cleanups (cleanups); breakpoint_set_commands (b, l); return; } error (_("No breakpoint number %d."), bnum); } /* Like commands_command, but instead of reading the commands from input stream, takes them from an already parsed command structure. This is used by cli-script.c to DTRT with breakpoint commands that are part of if and while bodies. */ enum command_control_type commands_from_control_command (char *arg, struct command_line *cmd) { struct breakpoint *b; char *p; int bnum; /* If we allowed this, we would have problems with when to free the storage, if we change the commands currently being read from. */ if (executing_breakpoint_commands) error (_("Can't use the \"commands\" command among a breakpoint's commands.")); /* An empty string for the breakpoint number means the last breakpoint, but get_number expects a NULL pointer. */ if (arg && !*arg) p = NULL; else p = arg; bnum = get_number (&p); if (p && *p) error (_("Unexpected extra arguments following breakpoint number.")); ALL_BREAKPOINTS (b) if (b->number == bnum) { free_command_lines (&b->commands); if (cmd->body_count != 1) error (_("Invalid \"commands\" block structure.")); /* We need to copy the commands because if/while will free the list after it finishes execution. */ b->commands = copy_command_lines (cmd->body_list[0]); breakpoints_changed (); observer_notify_breakpoint_modified (b->number); return simple_control; } error (_("No breakpoint number %d."), bnum); } /* Return non-zero if BL->TARGET_INFO contains valid information. */ static int bp_location_has_shadow (struct bp_location *bl) { if (bl->loc_type != bp_loc_software_breakpoint) return 0; if (!bl->inserted) return 0; if (bl->target_info.shadow_len == 0) /* bp isn't valid, or doesn't shadow memory. */ return 0; return 1; } /* Update BUF, which is LEN bytes read from the target address MEMADDR, by replacing any memory breakpoints with their shadowed contents. The range of shadowed area by each bp_location is: b->address - bp_location_placed_address_before_address_max up to b->address + bp_location_shadow_len_after_address_max The range we were requested to resolve shadows for is: memaddr ... memaddr + len Thus the safe cutoff boundaries for performance optimization are memaddr + len <= b->address - bp_location_placed_address_before_address_max and: b->address + bp_location_shadow_len_after_address_max <= memaddr */ void breakpoint_restore_shadows (gdb_byte *buf, ULONGEST memaddr, LONGEST len) { /* Left boundary, right boundary and median element of our binary search. */ unsigned bc_l, bc_r, bc; /* Find BC_L which is a leftmost element which may affect BUF content. It is safe to report lower value but a failure to report higher one. */ bc_l = 0; bc_r = bp_location_count; while (bc_l + 1 < bc_r) { struct bp_location *b; bc = (bc_l + bc_r) / 2; b = bp_location[bc]; /* Check first B->ADDRESS will not overflow due to the added constant. Then advance the left boundary only if we are sure the BC element can in no way affect the BUF content (MEMADDR to MEMADDR + LEN range). Use the BP_LOCATION_SHADOW_LEN_AFTER_ADDRESS_MAX safety offset so that we cannot miss a breakpoint with its shadow range tail still reaching MEMADDR. */ if (b->address + bp_location_shadow_len_after_address_max >= b->address && b->address + bp_location_shadow_len_after_address_max <= memaddr) bc_l = bc; else bc_r = bc; } /* Now do full processing of the found relevant range of elements. */ for (bc = bc_l; bc < bp_location_count; bc++) { struct bp_location *b = bp_location[bc]; CORE_ADDR bp_addr = 0; int bp_size = 0; int bptoffset = 0; if (b->owner->type == bp_none) warning (_("reading through apparently deleted breakpoint #%d?"), b->owner->number); /* Performance optimization: any futher element can no longer affect BUF content. */ if (b->address >= bp_location_placed_address_before_address_max && memaddr + len <= b->address - bp_location_placed_address_before_address_max) break; if (!bp_location_has_shadow (b)) continue; if (!breakpoint_address_match (b->target_info.placed_address_space, 0, current_program_space->aspace, 0)) continue; /* Addresses and length of the part of the breakpoint that we need to copy. */ bp_addr = b->target_info.placed_address; bp_size = b->target_info.shadow_len; if (bp_addr + bp_size <= memaddr) /* The breakpoint is entirely before the chunk of memory we are reading. */ continue; if (bp_addr >= memaddr + len) /* The breakpoint is entirely after the chunk of memory we are reading. */ continue; /* Offset within shadow_contents. */ if (bp_addr < memaddr) { /* Only copy the second part of the breakpoint. */ bp_size -= memaddr - bp_addr; bptoffset = memaddr - bp_addr; bp_addr = memaddr; } if (bp_addr + bp_size > memaddr + len) { /* Only copy the first part of the breakpoint. */ bp_size -= (bp_addr + bp_size) - (memaddr + len); } memcpy (buf + bp_addr - memaddr, b->target_info.shadow_contents + bptoffset, bp_size); } } /* A wrapper function for inserting catchpoints. */ static void insert_catchpoint (struct ui_out *uo, void *args) { struct breakpoint *b = (struct breakpoint *) args; int val = -1; gdb_assert (b->type == bp_catchpoint); gdb_assert (b->ops != NULL && b->ops->insert != NULL); b->ops->insert (b); } static int is_hardware_watchpoint (struct breakpoint *bpt) { return (bpt->type == bp_hardware_watchpoint || bpt->type == bp_read_watchpoint || bpt->type == bp_access_watchpoint); } /* Find the current value of a watchpoint on EXP. Return the value in *VALP and *RESULTP and the chain of intermediate and final values in *VAL_CHAIN. RESULTP and VAL_CHAIN may be NULL if the caller does not need them. If a memory error occurs while evaluating the expression, *RESULTP will be set to NULL. *RESULTP may be a lazy value, if the result could not be read from memory. It is used to determine whether a value is user-specified (we should watch the whole value) or intermediate (we should watch only the bit used to locate the final value). If the final value, or any intermediate value, could not be read from memory, *VALP will be set to NULL. *VAL_CHAIN will still be set to any referenced values. *VALP will never be a lazy value. This is the value which we store in struct breakpoint. If VAL_CHAIN is non-NULL, *VAL_CHAIN will be released from the value chain. The caller must free the values individually. If VAL_CHAIN is NULL, all generated values will be left on the value chain. */ static void fetch_watchpoint_value (struct expression *exp, struct value **valp, struct value **resultp, struct value **val_chain) { struct value *mark, *new_mark, *result; volatile struct gdb_exception ex; *valp = NULL; if (resultp) *resultp = NULL; if (val_chain) *val_chain = NULL; /* Evaluate the expression. */ mark = value_mark (); result = NULL; TRY_CATCH (ex, RETURN_MASK_ALL) { result = evaluate_expression (exp); } if (ex.reason < 0) { /* Ignore memory errors, we want watchpoints pointing at inaccessible memory to still be created; otherwise, throw the error to some higher catcher. */ switch (ex.error) { case MEMORY_ERROR: break; default: throw_exception (ex); break; } } new_mark = value_mark (); if (mark == new_mark) return; if (resultp) *resultp = result; /* Make sure it's not lazy, so that after the target stops again we have a non-lazy previous value to compare with. */ if (result != NULL && (!value_lazy (result) || gdb_value_fetch_lazy (result))) *valp = result; if (val_chain) { /* Return the chain of intermediate values. We use this to decide which addresses to watch. */ *val_chain = new_mark; value_release_to_mark (mark); } } /* Assuming that B is a watchpoint: returns true if the current thread and its running state are safe to evaluate or update watchpoint B. Watchpoints on local expressions need to be evaluated in the context of the thread that was current when the watchpoint was created, and, that thread needs to be stopped to be able to select the correct frame context. Watchpoints on global expressions can be evaluated on any thread, and in any state. It is presently left to the target allowing memory accesses when threads are running. */ static int watchpoint_in_thread_scope (struct breakpoint *b) { return (ptid_equal (b->watchpoint_thread, null_ptid) || (ptid_equal (inferior_ptid, b->watchpoint_thread) && !is_executing (inferior_ptid))); } /* Assuming that B is a watchpoint: - Reparse watchpoint expression, if REPARSE is non-zero - Evaluate expression and store the result in B->val - Evaluate the condition if there is one, and store the result in b->loc->cond. - Update the list of values that must be watched in B->loc. If the watchpoint disposition is disp_del_at_next_stop, then do nothing. If this is local watchpoint that is out of scope, delete it. Even with `set breakpoint always-inserted on' the watchpoints are removed + inserted on each stop here. Normal breakpoints must never be removed because they might be missed by a running thread when debugging in non-stop mode. On the other hand, hardware watchpoints (is_hardware_watchpoint; processed here) are specific to each LWP since they are stored in each LWP's hardware debug registers. Therefore, such LWP must be stopped first in order to be able to modify its hardware watchpoints. Hardware watchpoints must be reset exactly once after being presented to the user. It cannot be done sooner, because it would reset the data used to present the watchpoint hit to the user. And it must not be done later because it could display the same single watchpoint hit during multiple GDB stops. Note that the latter is relevant only to the hardware watchpoint types bp_read_watchpoint and bp_access_watchpoint. False hit by bp_hardware_watchpoint is not user-visible - its hit is suppressed if the memory content has not changed. The following constraints influence the location where we can reset hardware watchpoints: * target_stopped_by_watchpoint and target_stopped_data_address are called several times when GDB stops. [linux] * Multiple hardware watchpoints can be hit at the same time, causing GDB to stop. GDB only presents one hardware watchpoint hit at a time as the reason for stopping, and all the other hits are presented later, one after the other, each time the user requests the execution to be resumed. Execution is not resumed for the threads still having pending hit event stored in LWP_INFO->STATUS. While the watchpoint is already removed from the inferior on the first stop the thread hit event is kept being reported from its cached value by linux_nat_stopped_data_address until the real thread resume happens after the watchpoint gets presented and thus its LWP_INFO->STATUS gets reset. Therefore the hardware watchpoint hit can get safely reset on the watchpoint removal from inferior. */ static void update_watchpoint (struct breakpoint *b, int reparse) { int within_current_scope; struct frame_id saved_frame_id; struct bp_location *loc; int frame_saved; bpstat bs; /* If this is a local watchpoint, we only want to check if the watchpoint frame is in scope if the current thread is the thread that was used to create the watchpoint. */ if (!watchpoint_in_thread_scope (b)) return; /* We don't free locations. They are stored in bp_location array and update_global_locations will eventually delete them and remove breakpoints if needed. */ b->loc = NULL; if (b->disposition == disp_del_at_next_stop) return; frame_saved = 0; /* Determine if the watchpoint is within scope. */ if (b->exp_valid_block == NULL) within_current_scope = 1; else { struct frame_info *fi; /* Save the current frame's ID so we can restore it after evaluating the watchpoint expression on its own frame. */ /* FIXME drow/2003-09-09: It would be nice if evaluate_expression took a frame parameter, so that we didn't have to change the selected frame. */ frame_saved = 1; saved_frame_id = get_frame_id (get_selected_frame (NULL)); fi = frame_find_by_id (b->watchpoint_frame); within_current_scope = (fi != NULL); if (within_current_scope) select_frame (fi); } if (within_current_scope && reparse) { char *s; if (b->exp) { xfree (b->exp); b->exp = NULL; } s = b->exp_string; b->exp = parse_exp_1 (&s, b->exp_valid_block, 0); /* If the meaning of expression itself changed, the old value is no longer relevant. We don't want to report a watchpoint hit to the user when the old value and the new value may actually be completely different objects. */ value_free (b->val); b->val = NULL; b->val_valid = 0; } /* If we failed to parse the expression, for example because it refers to a global variable in a not-yet-loaded shared library, don't try to insert watchpoint. We don't automatically delete such watchpoint, though, since failure to parse expression is different from out-of-scope watchpoint. */ if ( !target_has_execution) { /* Without execution, memory can't change. No use to try and set watchpoint locations. The watchpoint will be reset when the target gains execution, through breakpoint_re_set. */ } else if (within_current_scope && b->exp) { struct value *val_chain, *v, *result, *next; struct program_space *frame_pspace; fetch_watchpoint_value (b->exp, &v, &result, &val_chain); /* Avoid setting b->val if it's already set. The meaning of b->val is 'the last value' user saw, and we should update it only if we reported that last value to user. As it happens, the code that reports it updates b->val directly. */ if (!b->val_valid) { b->val = v; b->val_valid = 1; } /* Change the type of breakpoint between hardware assisted or an ordinary watchpoint depending on the hardware support and free hardware slots. REPARSE is set when the inferior is started. */ if ((b->type == bp_watchpoint || b->type == bp_hardware_watchpoint) && reparse) { int i, mem_cnt, other_type_used; /* We need to determine how many resources are already used for all other hardware watchpoints to see if we still have enough resources to also fit this watchpoint in as well. To avoid the hw_watchpoint_used_count call below from counting this watchpoint, make sure that it is marked as a software watchpoint. */ b->type = bp_watchpoint; i = hw_watchpoint_used_count (bp_hardware_watchpoint, &other_type_used); mem_cnt = can_use_hardware_watchpoint (val_chain); if (!mem_cnt) b->type = bp_watchpoint; else { int target_resources_ok = target_can_use_hardware_watchpoint (bp_hardware_watchpoint, i + mem_cnt, other_type_used); if (target_resources_ok <= 0) b->type = bp_watchpoint; else b->type = bp_hardware_watchpoint; } } frame_pspace = get_frame_program_space (get_selected_frame (NULL)); /* Look at each value on the value chain. */ for (v = val_chain; v; v = next) { /* If it's a memory location, and GDB actually needed its contents to evaluate the expression, then we must watch it. If the first value returned is still lazy, that means an error occurred reading it; watch it anyway in case it becomes readable. */ if (VALUE_LVAL (v) == lval_memory && (v == val_chain || ! value_lazy (v))) { struct type *vtype = check_typedef (value_type (v)); /* We only watch structs and arrays if user asked for it explicitly, never if they just happen to appear in the middle of some value chain. */ if (v == result || (TYPE_CODE (vtype) != TYPE_CODE_STRUCT && TYPE_CODE (vtype) != TYPE_CODE_ARRAY)) { CORE_ADDR addr; int len, type; struct bp_location *loc, **tmp; addr = value_address (v); len = TYPE_LENGTH (value_type (v)); type = hw_write; if (b->type == bp_read_watchpoint) type = hw_read; else if (b->type == bp_access_watchpoint) type = hw_access; loc = allocate_bp_location (b); for (tmp = &(b->loc); *tmp != NULL; tmp = &((*tmp)->next)) ; *tmp = loc; loc->gdbarch = get_type_arch (value_type (v)); loc->pspace = frame_pspace; loc->address = addr; loc->length = len; loc->watchpoint_type = type; } } next = value_next (v); if (v != b->val) value_free (v); } /* We just regenerated the list of breakpoint locations. The new location does not have its condition field set to anything and therefore, we must always reparse the cond_string, independently of the value of the reparse flag. */ if (b->cond_string != NULL) { char *s = b->cond_string; b->loc->cond = parse_exp_1 (&s, b->exp_valid_block, 0); } } else if (!within_current_scope) { printf_filtered (_("\ Watchpoint %d deleted because the program has left the block \n\ in which its expression is valid.\n"), b->number); if (b->related_breakpoint) b->related_breakpoint->disposition = disp_del_at_next_stop; b->disposition = disp_del_at_next_stop; } /* Restore the selected frame. */ if (frame_saved) select_frame (frame_find_by_id (saved_frame_id)); } /* Returns 1 iff breakpoint location should be inserted in the inferior. */ static int should_be_inserted (struct bp_location *bpt) { if (!breakpoint_enabled (bpt->owner)) return 0; if (bpt->owner->disposition == disp_del_at_next_stop) return 0; if (!bpt->enabled || bpt->shlib_disabled || bpt->duplicate) return 0; /* This is set for example, when we're attached to the parent of a vfork, and have detached from the child. The child is running free, and we expect it to do an exec or exit, at which point the OS makes the parent schedulable again (and the target reports that the vfork is done). Until the child is done with the shared memory region, do not insert breakpoints in the parent, otherwise the child could still trip on the parent's breakpoints. Since the parent is blocked anyway, it won't miss any breakpoint. */ if (bpt->pspace->breakpoints_not_allowed) return 0; /* Tracepoints are inserted by the target at a time of its choosing, not by us. */ if (tracepoint_type (bpt->owner)) return 0; return 1; } /* Insert a low-level "breakpoint" of some type. BPT is the breakpoint. Any error messages are printed to TMP_ERROR_STREAM; and DISABLED_BREAKS, and HW_BREAKPOINT_ERROR are used to report problems. NOTE drow/2003-09-09: This routine could be broken down to an object-style method for each breakpoint or catchpoint type. */ static int insert_bp_location (struct bp_location *bpt, struct ui_file *tmp_error_stream, int *disabled_breaks, int *hw_breakpoint_error) { int val = 0; if (!should_be_inserted (bpt) || bpt->inserted) return 0; /* Initialize the target-specific information. */ memset (&bpt->target_info, 0, sizeof (bpt->target_info)); bpt->target_info.placed_address = bpt->address; bpt->target_info.placed_address_space = bpt->pspace->aspace; if (bpt->loc_type == bp_loc_software_breakpoint || bpt->loc_type == bp_loc_hardware_breakpoint) { if (bpt->owner->type != bp_hardware_breakpoint) { /* If the explicitly specified breakpoint type is not hardware breakpoint, check the memory map to see if the breakpoint address is in read only memory or not. Two important cases are: - location type is not hardware breakpoint, memory is readonly. We change the type of the location to hardware breakpoint. - location type is hardware breakpoint, memory is read-write. This means we've previously made the location hardware one, but then the memory map changed, so we undo. When breakpoints are removed, remove_breakpoints will use location types we've just set here, the only possible problem is that memory map has changed during running program, but it's not going to work anyway with current gdb. */ struct mem_region *mr = lookup_mem_region (bpt->target_info.placed_address); if (mr) { if (automatic_hardware_breakpoints) { int changed = 0; enum bp_loc_type new_type; if (mr->attrib.mode != MEM_RW) new_type = bp_loc_hardware_breakpoint; else new_type = bp_loc_software_breakpoint; if (new_type != bpt->loc_type) { static int said = 0; bpt->loc_type = new_type; if (!said) { fprintf_filtered (gdb_stdout, _("\ Note: automatically using hardware breakpoints for read-only addresses.\n")); said = 1; } } } else if (bpt->loc_type == bp_loc_software_breakpoint && mr->attrib.mode != MEM_RW) warning (_("cannot set software breakpoint at readonly address %s"), paddress (bpt->gdbarch, bpt->address)); } } /* First check to see if we have to handle an overlay. */ if (overlay_debugging == ovly_off || bpt->section == NULL || !(section_is_overlay (bpt->section))) { /* No overlay handling: just set the breakpoint. */ if (bpt->loc_type == bp_loc_hardware_breakpoint) val = target_insert_hw_breakpoint (bpt->gdbarch, &bpt->target_info); else val = target_insert_breakpoint (bpt->gdbarch, &bpt->target_info); } else { /* This breakpoint is in an overlay section. Shall we set a breakpoint at the LMA? */ if (!overlay_events_enabled) { /* Yes -- overlay event support is not active, so we must try to set a breakpoint at the LMA. This will not work for a hardware breakpoint. */ if (bpt->loc_type == bp_loc_hardware_breakpoint) warning (_("hardware breakpoint %d not supported in overlay!"), bpt->owner->number); else { CORE_ADDR addr = overlay_unmapped_address (bpt->address, bpt->section); /* Set a software (trap) breakpoint at the LMA. */ bpt->overlay_target_info = bpt->target_info; bpt->overlay_target_info.placed_address = addr; val = target_insert_breakpoint (bpt->gdbarch, &bpt->overlay_target_info); if (val != 0) fprintf_unfiltered (tmp_error_stream, "Overlay breakpoint %d failed: in ROM?\n", bpt->owner->number); } } /* Shall we set a breakpoint at the VMA? */ if (section_is_mapped (bpt->section)) { /* Yes. This overlay section is mapped into memory. */ if (bpt->loc_type == bp_loc_hardware_breakpoint) val = target_insert_hw_breakpoint (bpt->gdbarch, &bpt->target_info); else val = target_insert_breakpoint (bpt->gdbarch, &bpt->target_info); } else { /* No. This breakpoint will not be inserted. No error, but do not mark the bp as 'inserted'. */ return 0; } } if (val) { /* Can't set the breakpoint. */ if (solib_name_from_address (bpt->pspace, bpt->address)) { /* See also: disable_breakpoints_in_shlibs. */ val = 0; bpt->shlib_disabled = 1; if (!*disabled_breaks) { fprintf_unfiltered (tmp_error_stream, "Cannot insert breakpoint %d.\n", bpt->owner->number); fprintf_unfiltered (tmp_error_stream, "Temporarily disabling shared library breakpoints:\n"); } *disabled_breaks = 1; fprintf_unfiltered (tmp_error_stream, "breakpoint #%d\n", bpt->owner->number); } else { if (bpt->loc_type == bp_loc_hardware_breakpoint) { *hw_breakpoint_error = 1; fprintf_unfiltered (tmp_error_stream, "Cannot insert hardware breakpoint %d.\n", bpt->owner->number); } else { fprintf_unfiltered (tmp_error_stream, "Cannot insert breakpoint %d.\n", bpt->owner->number); fprintf_filtered (tmp_error_stream, "Error accessing memory address "); fputs_filtered (paddress (bpt->gdbarch, bpt->address), tmp_error_stream); fprintf_filtered (tmp_error_stream, ": %s.\n", safe_strerror (val)); } } } else bpt->inserted = 1; return val; } else if (bpt->loc_type == bp_loc_hardware_watchpoint /* NOTE drow/2003-09-08: This state only exists for removing watchpoints. It's not clear that it's necessary... */ && bpt->owner->disposition != disp_del_at_next_stop) { val = target_insert_watchpoint (bpt->address, bpt->length, bpt->watchpoint_type); bpt->inserted = (val != -1); } else if (bpt->owner->type == bp_catchpoint) { struct gdb_exception e = catch_exception (uiout, insert_catchpoint, bpt->owner, RETURN_MASK_ERROR); exception_fprintf (gdb_stderr, e, "warning: inserting catchpoint %d: ", bpt->owner->number); if (e.reason < 0) bpt->owner->enable_state = bp_disabled; else bpt->inserted = 1; /* We've already printed an error message if there was a problem inserting this catchpoint, and we've disabled the catchpoint, so just return success. */ return 0; } return 0; } /* This function is called when program space PSPACE is about to be deleted. It takes care of updating breakpoints to not reference PSPACE anymore. */ void breakpoint_program_space_exit (struct program_space *pspace) { struct breakpoint *b, *b_temp; struct bp_location *loc, **loc_temp; /* Remove any breakpoint that was set through this program space. */ ALL_BREAKPOINTS_SAFE (b, b_temp) { if (b->pspace == pspace) delete_breakpoint (b); } /* Breakpoints set through other program spaces could have locations bound to PSPACE as well. Remove those. */ ALL_BP_LOCATIONS (loc, loc_temp) { struct bp_location *tmp; if (loc->pspace == pspace) { if (loc->owner->loc == loc) loc->owner->loc = loc->next; else for (tmp = loc->owner->loc; tmp->next != NULL; tmp = tmp->next) if (tmp->next == loc) { tmp->next = loc->next; break; } } } /* Now update the global location list to permanently delete the removed locations above. */ update_global_location_list (0); } /* Make sure all breakpoints are inserted in inferior. Throws exception on any error. A breakpoint that is already inserted won't be inserted again, so calling this function twice is safe. */ void insert_breakpoints (void) { struct breakpoint *bpt; ALL_BREAKPOINTS (bpt) if (is_hardware_watchpoint (bpt)) update_watchpoint (bpt, 0 /* don't reparse. */); update_global_location_list (1); /* update_global_location_list does not insert breakpoints when always_inserted_mode is not enabled. Explicitly insert them now. */ if (!breakpoints_always_inserted_mode ()) insert_breakpoint_locations (); } /* insert_breakpoints is used when starting or continuing the program. remove_breakpoints is used when the program stops. Both return zero if successful, or an `errno' value if could not write the inferior. */ static void insert_breakpoint_locations (void) { struct breakpoint *bpt; struct bp_location *b, **bp_tmp; int error = 0; int val = 0; int disabled_breaks = 0; int hw_breakpoint_error = 0; struct ui_file *tmp_error_stream = mem_fileopen (); struct cleanup *cleanups = make_cleanup_ui_file_delete (tmp_error_stream); /* Explicitly mark the warning -- this will only be printed if there was an error. */ fprintf_unfiltered (tmp_error_stream, "Warning:\n"); save_current_space_and_thread (); ALL_BP_LOCATIONS (b, bp_tmp) { struct thread_info *tp; CORE_ADDR last_addr; if (!should_be_inserted (b) || b->inserted) continue; /* There is no point inserting thread-specific breakpoints if the thread no longer exists. */ if (b->owner->thread != -1 && !valid_thread_id (b->owner->thread)) continue; switch_to_program_space_and_thread (b->pspace); /* For targets that support global breakpoints, there's no need to select an inferior to insert breakpoint to. In fact, even if we aren't attached to any process yet, we should still insert breakpoints. */ if (!gdbarch_has_global_breakpoints (target_gdbarch) && ptid_equal (inferior_ptid, null_ptid)) continue; val = insert_bp_location (b, tmp_error_stream, &disabled_breaks, &hw_breakpoint_error); if (val) error = val; } /* If we failed to insert all locations of a watchpoint, remove them, as half-inserted watchpoint is of limited use. */ ALL_BREAKPOINTS (bpt) { int some_failed = 0; struct bp_location *loc; if (!is_hardware_watchpoint (bpt)) continue; if (!breakpoint_enabled (bpt)) continue; if (bpt->disposition == disp_del_at_next_stop) continue; for (loc = bpt->loc; loc; loc = loc->next) if (!loc->inserted && should_be_inserted (loc)) { some_failed = 1; break; } if (some_failed) { for (loc = bpt->loc; loc; loc = loc->next) if (loc->inserted) remove_breakpoint (loc, mark_uninserted); hw_breakpoint_error = 1; fprintf_unfiltered (tmp_error_stream, "Could not insert hardware watchpoint %d.\n", bpt->number); error = -1; } } if (error) { /* If a hardware breakpoint or watchpoint was inserted, add a message about possibly exhausted resources. */ if (hw_breakpoint_error) { fprintf_unfiltered (tmp_error_stream, "Could not insert hardware breakpoints:\n\ You may have requested too many hardware breakpoints/watchpoints.\n"); } target_terminal_ours_for_output (); error_stream (tmp_error_stream); } do_cleanups (cleanups); } int remove_breakpoints (void) { struct bp_location *b, **bp_tmp; int val = 0; ALL_BP_LOCATIONS (b, bp_tmp) { if (b->inserted) val |= remove_breakpoint (b, mark_uninserted); } return val; } /* Remove breakpoints of process PID. */ int remove_breakpoints_pid (int pid) { struct bp_location *b, **b_tmp; int val; struct inferior *inf = find_inferior_pid (pid); ALL_BP_LOCATIONS (b, b_tmp) { if (b->pspace != inf->pspace) continue; if (b->inserted) { val = remove_breakpoint (b, mark_uninserted); if (val != 0) return val; } } return 0; } int remove_hw_watchpoints (void) { struct bp_location *b, **bp_tmp; int val = 0; ALL_BP_LOCATIONS (b, bp_tmp) { if (b->inserted && b->loc_type == bp_loc_hardware_watchpoint) val |= remove_breakpoint (b, mark_uninserted); } return val; } int reattach_breakpoints (int pid) { struct cleanup *old_chain; struct bp_location *b, **bp_tmp; int val; struct ui_file *tmp_error_stream = mem_fileopen (); int dummy1 = 0, dummy2 = 0; struct inferior *inf; struct thread_info *tp; tp = any_live_thread_of_process (pid); if (tp == NULL) return 1; inf = find_inferior_pid (pid); old_chain = save_inferior_ptid (); inferior_ptid = tp->ptid; make_cleanup_ui_file_delete (tmp_error_stream); ALL_BP_LOCATIONS (b, bp_tmp) { if (b->pspace != inf->pspace) continue; if (b->inserted) { b->inserted = 0; val = insert_bp_location (b, tmp_error_stream, &dummy1, &dummy2); if (val != 0) { do_cleanups (old_chain); return val; } } } do_cleanups (old_chain); return 0; } static int internal_breakpoint_number = -1; static struct breakpoint * create_internal_breakpoint (struct gdbarch *gdbarch, CORE_ADDR address, enum bptype type) { struct symtab_and_line sal; struct breakpoint *b; init_sal (&sal); /* initialize to zeroes */ sal.pc = address; sal.section = find_pc_overlay (sal.pc); sal.pspace = current_program_space; b = set_raw_breakpoint (gdbarch, sal, type); b->number = internal_breakpoint_number--; b->disposition = disp_donttouch; return b; } static void create_overlay_event_breakpoint (char *func_name) { struct objfile *objfile; ALL_OBJFILES (objfile) { struct breakpoint *b; struct minimal_symbol *m; m = lookup_minimal_symbol_text (func_name, objfile); if (m == NULL) continue; b = create_internal_breakpoint (get_objfile_arch (objfile), SYMBOL_VALUE_ADDRESS (m), bp_overlay_event); b->addr_string = xstrdup (func_name); if (overlay_debugging == ovly_auto) { b->enable_state = bp_enabled; overlay_events_enabled = 1; } else { b->enable_state = bp_disabled; overlay_events_enabled = 0; } } update_global_location_list (1); } static void create_longjmp_master_breakpoint (char *func_name) { struct program_space *pspace; struct objfile *objfile; struct cleanup *old_chain; old_chain = save_current_program_space (); ALL_PSPACES (pspace) ALL_OBJFILES (objfile) { struct breakpoint *b; struct minimal_symbol *m; if (!gdbarch_get_longjmp_target_p (get_objfile_arch (objfile))) continue; set_current_program_space (pspace); m = lookup_minimal_symbol_text (func_name, objfile); if (m == NULL) continue; b = create_internal_breakpoint (get_objfile_arch (objfile), SYMBOL_VALUE_ADDRESS (m), bp_longjmp_master); b->addr_string = xstrdup (func_name); b->enable_state = bp_disabled; } update_global_location_list (1); do_cleanups (old_chain); } void update_breakpoints_after_exec (void) { struct breakpoint *b; struct breakpoint *temp; struct bp_location *bploc, **bplocp_tmp; /* We're about to delete breakpoints from GDB's lists. If the INSERTED flag is true, GDB will try to lift the breakpoints by writing the breakpoints' "shadow contents" back into memory. The "shadow contents" are NOT valid after an exec, so GDB should not do that. Instead, the target is responsible from marking breakpoints out as soon as it detects an exec. We don't do that here instead, because there may be other attempts to delete breakpoints after detecting an exec and before reaching here. */ ALL_BP_LOCATIONS (bploc, bplocp_tmp) if (bploc->pspace == current_program_space) gdb_assert (!bploc->inserted); ALL_BREAKPOINTS_SAFE (b, temp) { if (b->pspace != current_program_space) continue; /* Solib breakpoints must be explicitly reset after an exec(). */ if (b->type == bp_shlib_event) { delete_breakpoint (b); continue; } /* JIT breakpoints must be explicitly reset after an exec(). */ if (b->type == bp_jit_event) { delete_breakpoint (b); continue; } /* Thread event breakpoints must be set anew after an exec(), as must overlay event and longjmp master breakpoints. */ if (b->type == bp_thread_event || b->type == bp_overlay_event || b->type == bp_longjmp_master) { delete_breakpoint (b); continue; } /* Step-resume breakpoints are meaningless after an exec(). */ if (b->type == bp_step_resume) { delete_breakpoint (b); continue; } /* Longjmp and longjmp-resume breakpoints are also meaningless after an exec. */ if (b->type == bp_longjmp || b->type == bp_longjmp_resume) { delete_breakpoint (b); continue; } if (b->type == bp_catchpoint) { /* For now, none of the bp_catchpoint breakpoints need to do anything at this point. In the future, if some of the catchpoints need to something, we will need to add a new method, and call this method from here. */ continue; } /* bp_finish is a special case. The only way we ought to be able to see one of these when an exec() has happened, is if the user caught a vfork, and then said "finish". Ordinarily a finish just carries them to the call-site of the current callee, by setting a temporary bp there and resuming. But in this case, the finish will carry them entirely through the vfork & exec. We don't want to allow a bp_finish to remain inserted now. But we can't safely delete it, 'cause finish_command has a handle to the bp on a bpstat, and will later want to delete it. There's a chance (and I've seen it happen) that if we delete the bp_finish here, that its storage will get reused by the time finish_command gets 'round to deleting the "use to be a bp_finish" breakpoint. We really must allow finish_command to delete a bp_finish. In the absense of a general solution for the "how do we know it's safe to delete something others may have handles to?" problem, what we'll do here is just uninsert the bp_finish, and let finish_command delete it. (We know the bp_finish is "doomed" in the sense that it's momentary, and will be deleted as soon as finish_command sees the inferior stopped. So it doesn't matter that the bp's address is probably bogus in the new a.out, unlike e.g., the solib breakpoints.) */ if (b->type == bp_finish) { continue; } /* Without a symbolic address, we have little hope of the pre-exec() address meaning the same thing in the post-exec() a.out. */ if (b->addr_string == NULL) { delete_breakpoint (b); continue; } } /* FIXME what about longjmp breakpoints? Re-create them here? */ create_overlay_event_breakpoint ("_ovly_debug_event"); create_longjmp_master_breakpoint ("longjmp"); create_longjmp_master_breakpoint ("_longjmp"); create_longjmp_master_breakpoint ("siglongjmp"); create_longjmp_master_breakpoint ("_siglongjmp"); } int detach_breakpoints (int pid) { struct bp_location *b, **bp_tmp; int val = 0; struct cleanup *old_chain = save_inferior_ptid (); struct inferior *inf = current_inferior (); if (pid == PIDGET (inferior_ptid)) error (_("Cannot detach breakpoints of inferior_ptid")); /* Set inferior_ptid; remove_breakpoint_1 uses this global. */ inferior_ptid = pid_to_ptid (pid); ALL_BP_LOCATIONS (b, bp_tmp) { if (b->pspace != inf->pspace) continue; if (b->inserted) val |= remove_breakpoint_1 (b, mark_inserted); } do_cleanups (old_chain); return val; } /* Remove the breakpoint location B from the current address space. Note that this is used to detach breakpoints from a child fork. When we get here, the child isn't in the inferior list, and neither do we have objects to represent its address space --- we should *not* look at b->pspace->aspace here. */ static int remove_breakpoint_1 (struct bp_location *b, insertion_state_t is) { int val; struct cleanup *old_chain; if (b->owner->enable_state == bp_permanent) /* Permanent breakpoints cannot be inserted or removed. */ return 0; /* The type of none suggests that owner is actually deleted. This should not ever happen. */ gdb_assert (b->owner->type != bp_none); if (b->loc_type == bp_loc_software_breakpoint || b->loc_type == bp_loc_hardware_breakpoint) { /* "Normal" instruction breakpoint: either the standard trap-instruction bp (bp_breakpoint), or a bp_hardware_breakpoint. */ /* First check to see if we have to handle an overlay. */ if (overlay_debugging == ovly_off || b->section == NULL || !(section_is_overlay (b->section))) { /* No overlay handling: just remove the breakpoint. */ if (b->loc_type == bp_loc_hardware_breakpoint) val = target_remove_hw_breakpoint (b->gdbarch, &b->target_info); else val = target_remove_breakpoint (b->gdbarch, &b->target_info); } else { /* This breakpoint is in an overlay section. Did we set a breakpoint at the LMA? */ if (!overlay_events_enabled) { /* Yes -- overlay event support is not active, so we should have set a breakpoint at the LMA. Remove it. */ /* Ignore any failures: if the LMA is in ROM, we will have already warned when we failed to insert it. */ if (b->loc_type == bp_loc_hardware_breakpoint) target_remove_hw_breakpoint (b->gdbarch, &b->overlay_target_info); else target_remove_breakpoint (b->gdbarch, &b->overlay_target_info); } /* Did we set a breakpoint at the VMA? If so, we will have marked the breakpoint 'inserted'. */ if (b->inserted) { /* Yes -- remove it. Previously we did not bother to remove the breakpoint if the section had been unmapped, but let's not rely on that being safe. We don't know what the overlay manager might do. */ if (b->loc_type == bp_loc_hardware_breakpoint) val = target_remove_hw_breakpoint (b->gdbarch, &b->target_info); /* However, we should remove *software* breakpoints only if the section is still mapped, or else we overwrite wrong code with the saved shadow contents. */ else if (section_is_mapped (b->section)) val = target_remove_breakpoint (b->gdbarch, &b->target_info); else val = 0; } else { /* No -- not inserted, so no need to remove. No error. */ val = 0; } } /* In some cases, we might not be able to remove a breakpoint in a shared library that has already been removed, but we have not yet processed the shlib unload event. */ if (val && solib_name_from_address (b->pspace, b->address)) val = 0; if (val) return val; b->inserted = (is == mark_inserted); } else if (b->loc_type == bp_loc_hardware_watchpoint) { struct value *v; struct value *n; b->inserted = (is == mark_inserted); val = target_remove_watchpoint (b->address, b->length, b->watchpoint_type); /* Failure to remove any of the hardware watchpoints comes here. */ if ((is == mark_uninserted) && (b->inserted)) warning (_("Could not remove hardware watchpoint %d."), b->owner->number); } else if (b->owner->type == bp_catchpoint && breakpoint_enabled (b->owner) && !b->duplicate) { gdb_assert (b->owner->ops != NULL && b->owner->ops->remove != NULL); val = b->owner->ops->remove (b->owner); if (val) return val; b->inserted = (is == mark_inserted); } return 0; } static int remove_breakpoint (struct bp_location *b, insertion_state_t is) { int ret; struct cleanup *old_chain; if (b->owner->enable_state == bp_permanent) /* Permanent breakpoints cannot be inserted or removed. */ return 0; /* The type of none suggests that owner is actually deleted. This should not ever happen. */ gdb_assert (b->owner->type != bp_none); old_chain = save_current_space_and_thread (); switch_to_program_space_and_thread (b->pspace); ret = remove_breakpoint_1 (b, is); do_cleanups (old_chain); return ret; } /* Clear the "inserted" flag in all breakpoints. */ void mark_breakpoints_out (void) { struct bp_location *bpt, **bptp_tmp; ALL_BP_LOCATIONS (bpt, bptp_tmp) if (bpt->pspace == current_program_space) bpt->inserted = 0; } /* Clear the "inserted" flag in all breakpoints and delete any breakpoints which should go away between runs of the program. Plus other such housekeeping that has to be done for breakpoints between runs. Note: this function gets called at the end of a run (by generic_mourn_inferior) and when a run begins (by init_wait_for_inferior). */ void breakpoint_init_inferior (enum inf_context context) { struct breakpoint *b, *temp; struct bp_location *bpt, **bptp_tmp; int ix; struct program_space *pspace = current_program_space; /* If breakpoint locations are shared across processes, then there's nothing to do. */ if (gdbarch_has_global_breakpoints (target_gdbarch)) return; ALL_BP_LOCATIONS (bpt, bptp_tmp) { if (bpt->pspace == pspace && bpt->owner->enable_state != bp_permanent) bpt->inserted = 0; } ALL_BREAKPOINTS_SAFE (b, temp) { if (b->loc && b->loc->pspace != pspace) continue; switch (b->type) { case bp_call_dummy: case bp_watchpoint_scope: /* If the call dummy breakpoint is at the entry point it will cause problems when the inferior is rerun, so we better get rid of it. Also get rid of scope breakpoints. */ delete_breakpoint (b); break; case bp_watchpoint: case bp_hardware_watchpoint: case bp_read_watchpoint: case bp_access_watchpoint: /* Likewise for watchpoints on local expressions. */ if (b->exp_valid_block != NULL) delete_breakpoint (b); else if (context == inf_starting) { /* Reset val field to force reread of starting value in insert_breakpoints. */ if (b->val) value_free (b->val); b->val = NULL; b->val_valid = 0; } break; default: break; } } /* Get rid of the moribund locations. */ for (ix = 0; VEC_iterate (bp_location_p, moribund_locations, ix, bpt); ++ix) free_bp_location (bpt); VEC_free (bp_location_p, moribund_locations); } /* These functions concern about actual breakpoints inserted in the target --- to e.g. check if we need to do decr_pc adjustment or if we need to hop over the bkpt --- so we check for address space match, not program space. */ /* breakpoint_here_p (PC) returns non-zero if an enabled breakpoint exists at PC. It returns ordinary_breakpoint_here if it's an ordinary breakpoint, or permanent_breakpoint_here if it's a permanent breakpoint. - When continuing from a location with an ordinary breakpoint, we actually single step once before calling insert_breakpoints. - When continuing from a localion with a permanent breakpoint, we need to use the `SKIP_PERMANENT_BREAKPOINT' macro, provided by the target, to advance the PC past the breakpoint. */ enum breakpoint_here breakpoint_here_p (struct address_space *aspace, CORE_ADDR pc) { struct bp_location *bpt, **bptp_tmp; int any_breakpoint_here = 0; ALL_BP_LOCATIONS (bpt, bptp_tmp) { if (bpt->loc_type != bp_loc_software_breakpoint && bpt->loc_type != bp_loc_hardware_breakpoint) continue; if ((breakpoint_enabled (bpt->owner) || bpt->owner->enable_state == bp_permanent) && breakpoint_address_match (bpt->pspace->aspace, bpt->address, aspace, pc)) { if (overlay_debugging && section_is_overlay (bpt->section) && !section_is_mapped (bpt->section)) continue; /* unmapped overlay -- can't be a match */ else if (bpt->owner->enable_state == bp_permanent) return permanent_breakpoint_here; else any_breakpoint_here = 1; } } return any_breakpoint_here ? ordinary_breakpoint_here : 0; } /* Return true if there's a moribund breakpoint at PC. */ int moribund_breakpoint_here_p (struct address_space *aspace, CORE_ADDR pc) { struct bp_location *loc; int ix; for (ix = 0; VEC_iterate (bp_location_p, moribund_locations, ix, loc); ++ix) if (breakpoint_address_match (loc->pspace->aspace, loc->address, aspace, pc)) return 1; return 0; } /* Returns non-zero if there's a breakpoint inserted at PC, which is inserted using regular breakpoint_chain / bp_location array mechanism. This does not check for single-step breakpoints, which are inserted and removed using direct target manipulation. */ int regular_breakpoint_inserted_here_p (struct address_space *aspace, CORE_ADDR pc) { struct bp_location *bpt, **bptp_tmp; ALL_BP_LOCATIONS (bpt, bptp_tmp) { if (bpt->loc_type != bp_loc_software_breakpoint && bpt->loc_type != bp_loc_hardware_breakpoint) continue; if (bpt->inserted && breakpoint_address_match (bpt->pspace->aspace, bpt->address, aspace, pc)) { if (overlay_debugging && section_is_overlay (bpt->section) && !section_is_mapped (bpt->section)) continue; /* unmapped overlay -- can't be a match */ else return 1; } } return 0; } /* Returns non-zero iff there's either regular breakpoint or a single step breakpoint inserted at PC. */ int breakpoint_inserted_here_p (struct address_space *aspace, CORE_ADDR pc) { if (regular_breakpoint_inserted_here_p (aspace, pc)) return 1; if (single_step_breakpoint_inserted_here_p (aspace, pc)) return 1; return 0; } /* This function returns non-zero iff there is a software breakpoint inserted at PC. */ int software_breakpoint_inserted_here_p (struct address_space *aspace, CORE_ADDR pc) { struct bp_location *bpt, **bptp_tmp; int any_breakpoint_here = 0; ALL_BP_LOCATIONS (bpt, bptp_tmp) { if (bpt->loc_type != bp_loc_software_breakpoint) continue; if (bpt->inserted && breakpoint_address_match (bpt->pspace->aspace, bpt->address, aspace, pc)) { if (overlay_debugging && section_is_overlay (bpt->section) && !section_is_mapped (bpt->section)) continue; /* unmapped overlay -- can't be a match */ else return 1; } } /* Also check for software single-step breakpoints. */ if (single_step_breakpoint_inserted_here_p (aspace, pc)) return 1; return 0; } int hardware_watchpoint_inserted_in_range (struct address_space *aspace, CORE_ADDR addr, ULONGEST len) { struct breakpoint *bpt; ALL_BREAKPOINTS (bpt) { struct bp_location *loc; if (bpt->type != bp_hardware_watchpoint && bpt->type != bp_access_watchpoint) continue; if (!breakpoint_enabled (bpt)) continue; for (loc = bpt->loc; loc; loc = loc->next) if (loc->pspace->aspace == aspace && loc->inserted) { CORE_ADDR l, h; /* Check for intersection. */ l = max (loc->address, addr); h = min (loc->address + loc->length, addr + len); if (l < h) return 1; } } return 0; } /* breakpoint_thread_match (PC, PTID) returns true if the breakpoint at PC is valid for process/thread PTID. */ int breakpoint_thread_match (struct address_space *aspace, CORE_ADDR pc, ptid_t ptid) { struct bp_location *bpt, **bptp_tmp; /* The thread and task IDs associated to PTID, computed lazily. */ int thread = -1; int task = 0; ALL_BP_LOCATIONS (bpt, bptp_tmp) { if (bpt->loc_type != bp_loc_software_breakpoint && bpt->loc_type != bp_loc_hardware_breakpoint) continue; if (!breakpoint_enabled (bpt->owner) && bpt->owner->enable_state != bp_permanent) continue; if (!breakpoint_address_match (bpt->pspace->aspace, bpt->address, aspace, pc)) continue; if (bpt->owner->thread != -1) { /* This is a thread-specific breakpoint. Check that ptid matches that thread. If thread hasn't been computed yet, it is now time to do so. */ if (thread == -1) thread = pid_to_thread_id (ptid); if (bpt->owner->thread != thread) continue; } if (bpt->owner->task != 0) { /* This is a task-specific breakpoint. Check that ptid matches that task. If task hasn't been computed yet, it is now time to do so. */ if (task == 0) task = ada_get_task_number (ptid); if (bpt->owner->task != task) continue; } if (overlay_debugging && section_is_overlay (bpt->section) && !section_is_mapped (bpt->section)) continue; /* unmapped overlay -- can't be a match */ return 1; } return 0; } /* bpstat stuff. External routines' interfaces are documented in breakpoint.h. */ int ep_is_catchpoint (struct breakpoint *ep) { return (ep->type == bp_catchpoint); } void bpstat_free (bpstat bs) { if (bs->old_val != NULL) value_free (bs->old_val); free_command_lines (&bs->commands); xfree (bs); } /* Clear a bpstat so that it says we are not at any breakpoint. Also free any storage that is part of a bpstat. */ void bpstat_clear (bpstat *bsp) { bpstat p; bpstat q; if (bsp == 0) return; p = *bsp; while (p != NULL) { q = p->next; bpstat_free (p); p = q; } *bsp = NULL; } /* Return a copy of a bpstat. Like "bs1 = bs2" but all storage that is part of the bpstat is copied as well. */ bpstat bpstat_copy (bpstat bs) { bpstat p = NULL; bpstat tmp; bpstat retval = NULL; if (bs == NULL) return bs; for (; bs != NULL; bs = bs->next) { tmp = (bpstat) xmalloc (sizeof (*tmp)); memcpy (tmp, bs, sizeof (*tmp)); if (bs->commands != NULL) tmp->commands = copy_command_lines (bs->commands); if (bs->old_val != NULL) { tmp->old_val = value_copy (bs->old_val); release_value (tmp->old_val); } if (p == NULL) /* This is the first thing in the chain. */ retval = tmp; else p->next = tmp; p = tmp; } p->next = NULL; return retval; } /* Find the bpstat associated with this breakpoint */ bpstat bpstat_find_breakpoint (bpstat bsp, struct breakpoint *breakpoint) { if (bsp == NULL) return NULL; for (; bsp != NULL; bsp = bsp->next) { if (bsp->breakpoint_at && bsp->breakpoint_at->owner == breakpoint) return bsp; } return NULL; } /* Find a step_resume breakpoint associated with this bpstat. (If there are multiple step_resume bp's on the list, this function will arbitrarily pick one.) It is an error to use this function if BPSTAT doesn't contain a step_resume breakpoint. See wait_for_inferior's use of this function. */ struct breakpoint * bpstat_find_step_resume_breakpoint (bpstat bsp) { int current_thread; gdb_assert (bsp != NULL); current_thread = pid_to_thread_id (inferior_ptid); for (; bsp != NULL; bsp = bsp->next) { if ((bsp->breakpoint_at != NULL) && (bsp->breakpoint_at->owner->type == bp_step_resume) && (bsp->breakpoint_at->owner->thread == current_thread || bsp->breakpoint_at->owner->thread == -1)) return bsp->breakpoint_at->owner; } internal_error (__FILE__, __LINE__, _("No step_resume breakpoint found.")); } /* Put in *NUM the breakpoint number of the first breakpoint we are stopped at. *BSP upon return is a bpstat which points to the remaining breakpoints stopped at (but which is not guaranteed to be good for anything but further calls to bpstat_num). Return 0 if passed a bpstat which does not indicate any breakpoints. Return -1 if stopped at a breakpoint that has been deleted since we set it. Return 1 otherwise. */ int bpstat_num (bpstat *bsp, int *num) { struct breakpoint *b; if ((*bsp) == NULL) return 0; /* No more breakpoint values */ /* We assume we'll never have several bpstats that correspond to a single breakpoint -- otherwise, this function might return the same number more than once and this will look ugly. */ b = (*bsp)->breakpoint_at ? (*bsp)->breakpoint_at->owner : NULL; *bsp = (*bsp)->next; if (b == NULL) return -1; /* breakpoint that's been deleted since */ *num = b->number; /* We have its number */ return 1; } /* Modify BS so that the actions will not be performed. */ void bpstat_clear_actions (bpstat bs) { for (; bs != NULL; bs = bs->next) { free_command_lines (&bs->commands); if (bs->old_val != NULL) { value_free (bs->old_val); bs->old_val = NULL; } } } /* Called when a command is about to proceed the inferior. */ static void breakpoint_about_to_proceed (void) { if (!ptid_equal (inferior_ptid, null_ptid)) { struct thread_info *tp = inferior_thread (); /* Allow inferior function calls in breakpoint commands to not interrupt the command list. When the call finishes successfully, the inferior will be standing at the same breakpoint as if nothing happened. */ if (tp->in_infcall) return; } breakpoint_proceeded = 1; } /* Stub for cleaning up our state if we error-out of a breakpoint command */ static void cleanup_executing_breakpoints (void *ignore) { executing_breakpoint_commands = 0; } /* Execute all the commands associated with all the breakpoints at this location. Any of these commands could cause the process to proceed beyond this point, etc. We look out for such changes by checking the global "breakpoint_proceeded" after each command. Returns true if a breakpoint command resumed the inferior. In that case, it is the caller's responsibility to recall it again with the bpstat of the current thread. */ static int bpstat_do_actions_1 (bpstat *bsp) { bpstat bs; struct cleanup *old_chain; int again = 0; /* Avoid endless recursion if a `source' command is contained in bs->commands. */ if (executing_breakpoint_commands) return 0; executing_breakpoint_commands = 1; old_chain = make_cleanup (cleanup_executing_breakpoints, 0); /* This pointer will iterate over the list of bpstat's. */ bs = *bsp; breakpoint_proceeded = 0; for (; bs != NULL; bs = bs->next) { struct command_line *cmd; struct cleanup *this_cmd_tree_chain; /* Take ownership of the BSP's command tree, if it has one. The command tree could legitimately contain commands like 'step' and 'next', which call clear_proceed_status, which frees stop_bpstat's command tree. To make sure this doesn't free the tree we're executing out from under us, we need to take ownership of the tree ourselves. Since a given bpstat's commands are only executed once, we don't need to copy it; we can clear the pointer in the bpstat, and make sure we free the tree when we're done. */ cmd = bs->commands; bs->commands = 0; this_cmd_tree_chain = make_cleanup_free_command_lines (&cmd); while (cmd != NULL) { execute_control_command (cmd); if (breakpoint_proceeded) break; else cmd = cmd->next; } /* We can free this command tree now. */ do_cleanups (this_cmd_tree_chain); if (breakpoint_proceeded) { if (target_can_async_p ()) /* If we are in async mode, then the target might be still running, not stopped at any breakpoint, so nothing for us to do here -- just return to the event loop. */ ; else /* In sync mode, when execute_control_command returns we're already standing on the next breakpoint. Breakpoint commands for that stop were not run, since execute_command does not run breakpoint commands -- only command_line_handler does, but that one is not involved in execution of breakpoint commands. So, we can now execute breakpoint commands. It should be noted that making execute_command do bpstat actions is not an option -- in this case we'll have recursive invocation of bpstat for each breakpoint with a command, and can easily blow up GDB stack. Instead, we return true, which will trigger the caller to recall us with the new stop_bpstat. */ again = 1; break; } } do_cleanups (old_chain); return again; } void bpstat_do_actions (void) { /* Do any commands attached to breakpoint we are stopped at. */ while (!ptid_equal (inferior_ptid, null_ptid) && target_has_execution && !is_exited (inferior_ptid) && !is_executing (inferior_ptid)) /* Since in sync mode, bpstat_do_actions may resume the inferior, and only return when it is stopped at the next breakpoint, we keep doing breakpoint actions until it returns false to indicate the inferior was not resumed. */ if (!bpstat_do_actions_1 (&inferior_thread ()->stop_bpstat)) break; } /* Print out the (old or new) value associated with a watchpoint. */ static void watchpoint_value_print (struct value *val, struct ui_file *stream) { if (val == NULL) fprintf_unfiltered (stream, _("<unreadable>")); else { struct value_print_options opts; get_user_print_options (&opts); value_print (val, stream, &opts); } } /* This is the normal print function for a bpstat. In the future, much of this logic could (should?) be moved to bpstat_stop_status, by having it set different print_it values. Current scheme: When we stop, bpstat_print() is called. It loops through the bpstat list of things causing this stop, calling the print_bp_stop_message function on each one. The behavior of the print_bp_stop_message function depends on the print_it field of bpstat. If such field so indicates, call this function here. Return values from this routine (ultimately used by bpstat_print() and normal_stop() to decide what to do): PRINT_NOTHING: Means we already printed all we needed to print, don't print anything else. PRINT_SRC_ONLY: Means we printed something, and we do *not* desire that something to be followed by a location. PRINT_SCR_AND_LOC: Means we printed something, and we *do* desire that something to be followed by a location. PRINT_UNKNOWN: Means we printed nothing or we need to do some more analysis. */ static enum print_stop_action print_it_typical (bpstat bs) { struct cleanup *old_chain; struct breakpoint *b; const struct bp_location *bl; struct ui_stream *stb; int bp_temp = 0; enum print_stop_action result; /* bs->breakpoint_at can be NULL if it was a momentary breakpoint which has since been deleted. */ if (bs->breakpoint_at == NULL) return PRINT_UNKNOWN; bl = bs->breakpoint_at; b = bl->owner; stb = ui_out_stream_new (uiout); old_chain = make_cleanup_ui_out_stream_delete (stb); switch (b->type) { case bp_breakpoint: case bp_hardware_breakpoint: bp_temp = bs->breakpoint_at->owner->disposition == disp_del; if (bl->address != bl->requested_address) breakpoint_adjustment_warning (bl->requested_address, bl->address, b->number, 1); annotate_breakpoint (b->number); if (bp_temp) ui_out_text (uiout, "\nTemporary breakpoint "); else ui_out_text (uiout, "\nBreakpoint "); if (ui_out_is_mi_like_p (uiout)) { ui_out_field_string (uiout, "reason", async_reason_lookup (EXEC_ASYNC_BREAKPOINT_HIT)); ui_out_field_string (uiout, "disp", bpdisp_text (b->disposition)); } ui_out_field_int (uiout, "bkptno", b->number); ui_out_text (uiout, ", "); result = PRINT_SRC_AND_LOC; break; case bp_shlib_event: /* Did we stop because the user set the stop_on_solib_events variable? (If so, we report this as a generic, "Stopped due to shlib event" message.) */ printf_filtered (_("Stopped due to shared library event\n")); result = PRINT_NOTHING; break; case bp_thread_event: /* Not sure how we will get here. GDB should not stop for these breakpoints. */ printf_filtered (_("Thread Event Breakpoint: gdb should not stop!\n")); result = PRINT_NOTHING; break; case bp_overlay_event: /* By analogy with the thread event, GDB should not stop for these. */ printf_filtered (_("Overlay Event Breakpoint: gdb should not stop!\n")); result = PRINT_NOTHING; break; case bp_longjmp_master: /* These should never be enabled. */ printf_filtered (_("Longjmp Master Breakpoint: gdb should not stop!\n")); result = PRINT_NOTHING; break; case bp_watchpoint: case bp_hardware_watchpoint: annotate_watchpoint (b->number); if (ui_out_is_mi_like_p (uiout)) ui_out_field_string (uiout, "reason", async_reason_lookup (EXEC_ASYNC_WATCHPOINT_TRIGGER)); mention (b); make_cleanup_ui_out_tuple_begin_end (uiout, "value"); ui_out_text (uiout, "\nOld value = "); watchpoint_value_print (bs->old_val, stb->stream); ui_out_field_stream (uiout, "old", stb); ui_out_text (uiout, "\nNew value = "); watchpoint_value_print (b->val, stb->stream); ui_out_field_stream (uiout, "new", stb); ui_out_text (uiout, "\n"); /* More than one watchpoint may have been triggered. */ result = PRINT_UNKNOWN; break; case bp_read_watchpoint: if (ui_out_is_mi_like_p (uiout)) ui_out_field_string (uiout, "reason", async_reason_lookup (EXEC_ASYNC_READ_WATCHPOINT_TRIGGER)); mention (b); make_cleanup_ui_out_tuple_begin_end (uiout, "value"); ui_out_text (uiout, "\nValue = "); watchpoint_value_print (b->val, stb->stream); ui_out_field_stream (uiout, "value", stb); ui_out_text (uiout, "\n"); result = PRINT_UNKNOWN; break; case bp_access_watchpoint: if (bs->old_val != NULL) { annotate_watchpoint (b->number); if (ui_out_is_mi_like_p (uiout)) ui_out_field_string (uiout, "reason", async_reason_lookup (EXEC_ASYNC_ACCESS_WATCHPOINT_TRIGGER)); mention (b); make_cleanup_ui_out_tuple_begin_end (uiout, "value"); ui_out_text (uiout, "\nOld value = "); watchpoint_value_print (bs->old_val, stb->stream); ui_out_field_stream (uiout, "old", stb); ui_out_text (uiout, "\nNew value = "); } else { mention (b); if (ui_out_is_mi_like_p (uiout)) ui_out_field_string (uiout, "reason", async_reason_lookup (EXEC_ASYNC_ACCESS_WATCHPOINT_TRIGGER)); make_cleanup_ui_out_tuple_begin_end (uiout, "value"); ui_out_text (uiout, "\nValue = "); } watchpoint_value_print (b->val, stb->stream); ui_out_field_stream (uiout, "new", stb); ui_out_text (uiout, "\n"); result = PRINT_UNKNOWN; break; /* Fall through, we don't deal with these types of breakpoints here. */ case bp_finish: if (ui_out_is_mi_like_p (uiout)) ui_out_field_string (uiout, "reason", async_reason_lookup (EXEC_ASYNC_FUNCTION_FINISHED)); result = PRINT_UNKNOWN; break; case bp_until: if (ui_out_is_mi_like_p (uiout)) ui_out_field_string (uiout, "reason", async_reason_lookup (EXEC_ASYNC_LOCATION_REACHED)); result = PRINT_UNKNOWN; break; case bp_none: case bp_longjmp: case bp_longjmp_resume: case bp_step_resume: case bp_watchpoint_scope: case bp_call_dummy: case bp_tracepoint: case bp_fast_tracepoint: case bp_jit_event: default: result = PRINT_UNKNOWN; break; } do_cleanups (old_chain); return result; } /* Generic routine for printing messages indicating why we stopped. The behavior of this function depends on the value 'print_it' in the bpstat structure. Under some circumstances we may decide not to print anything here and delegate the task to normal_stop(). */ static enum print_stop_action print_bp_stop_message (bpstat bs) { switch (bs->print_it) { case print_it_noop: /* Nothing should be printed for this bpstat entry. */ return PRINT_UNKNOWN; break; case print_it_done: /* We still want to print the frame, but we already printed the relevant messages. */ return PRINT_SRC_AND_LOC; break; case print_it_normal: { const struct bp_location *bl = bs->breakpoint_at; struct breakpoint *b = bl ? bl->owner : NULL; /* Normal case. Call the breakpoint's print_it method, or print_it_typical. */ /* FIXME: how breakpoint can ever be NULL here? */ if (b != NULL && b->ops != NULL && b->ops->print_it != NULL) return b->ops->print_it (b); else return print_it_typical (bs); } break; default: internal_error (__FILE__, __LINE__, _("print_bp_stop_message: unrecognized enum value")); break; } } /* Print a message indicating what happened. This is called from normal_stop(). The input to this routine is the head of the bpstat list - a list of the eventpoints that caused this stop. This routine calls the generic print routine for printing a message about reasons for stopping. This will print (for example) the "Breakpoint n," part of the output. The return value of this routine is one of: PRINT_UNKNOWN: Means we printed nothing PRINT_SRC_AND_LOC: Means we printed something, and expect subsequent code to print the location. An example is "Breakpoint 1, " which should be followed by the location. PRINT_SRC_ONLY: Means we printed something, but there is no need to also print the location part of the message. An example is the catch/throw messages, which don't require a location appended to the end. PRINT_NOTHING: We have done some printing and we don't need any further info to be printed.*/ enum print_stop_action bpstat_print (bpstat bs) { int val; /* Maybe another breakpoint in the chain caused us to stop. (Currently all watchpoints go on the bpstat whether hit or not. That probably could (should) be changed, provided care is taken with respect to bpstat_explains_signal). */ for (; bs; bs = bs->next) { val = print_bp_stop_message (bs); if (val == PRINT_SRC_ONLY || val == PRINT_SRC_AND_LOC || val == PRINT_NOTHING) return val; } /* We reached the end of the chain, or we got a null BS to start with and nothing was printed. */ return PRINT_UNKNOWN; } /* Evaluate the expression EXP and return 1 if value is zero. This is used inside a catch_errors to evaluate the breakpoint condition. The argument is a "struct expression *" that has been cast to char * to make it pass through catch_errors. */ static int breakpoint_cond_eval (void *exp) { struct value *mark = value_mark (); int i = !value_true (evaluate_expression ((struct expression *) exp)); value_free_to_mark (mark); return i; } /* Allocate a new bpstat and chain it to the current one. */ static bpstat bpstat_alloc (const struct bp_location *bl, bpstat cbs /* Current "bs" value */ ) { bpstat bs; bs = (bpstat) xmalloc (sizeof (*bs)); cbs->next = bs; bs->breakpoint_at = bl; /* If the condition is false, etc., don't do the commands. */ bs->commands = NULL; bs->old_val = NULL; bs->print_it = print_it_normal; return bs; } /* The target has stopped with waitstatus WS. Check if any hardware watchpoints have triggered, according to the target. */ int watchpoints_triggered (struct target_waitstatus *ws) { int stopped_by_watchpoint = target_stopped_by_watchpoint (); CORE_ADDR addr; struct breakpoint *b; if (!stopped_by_watchpoint) { /* We were not stopped by a watchpoint. Mark all watchpoints as not triggered. */ ALL_BREAKPOINTS (b) if (b->type == bp_hardware_watchpoint || b->type == bp_read_watchpoint || b->type == bp_access_watchpoint) b->watchpoint_triggered = watch_triggered_no; return 0; } if (!target_stopped_data_address (¤t_target, &addr)) { /* We were stopped by a watchpoint, but we don't know where. Mark all watchpoints as unknown. */ ALL_BREAKPOINTS (b) if (b->type == bp_hardware_watchpoint || b->type == bp_read_watchpoint || b->type == bp_access_watchpoint) b->watchpoint_triggered = watch_triggered_unknown; return stopped_by_watchpoint; } /* The target could report the data address. Mark watchpoints affected by this data address as triggered, and all others as not triggered. */ ALL_BREAKPOINTS (b) if (b->type == bp_hardware_watchpoint || b->type == bp_read_watchpoint || b->type == bp_access_watchpoint) { struct bp_location *loc; struct value *v; b->watchpoint_triggered = watch_triggered_no; for (loc = b->loc; loc; loc = loc->next) /* Exact match not required. Within range is sufficient. */ if (target_watchpoint_addr_within_range (¤t_target, addr, loc->address, loc->length)) { b->watchpoint_triggered = watch_triggered_yes; break; } } return 1; } /* Possible return values for watchpoint_check (this can't be an enum because of check_errors). */ /* The watchpoint has been deleted. */ #define WP_DELETED 1 /* The value has changed. */ #define WP_VALUE_CHANGED 2 /* The value has not changed. */ #define WP_VALUE_NOT_CHANGED 3 #define BP_TEMPFLAG 1 #define BP_HARDWAREFLAG 2 /* Evaluate watchpoint condition expression and check if its value changed. P should be a pointer to struct bpstat, but is defined as a void * in order for this function to be usable with catch_errors. */ static int watchpoint_check (void *p) { bpstat bs = (bpstat) p; struct breakpoint *b; struct frame_info *fr; int within_current_scope; b = bs->breakpoint_at->owner; /* If this is a local watchpoint, we only want to check if the watchpoint frame is in scope if the current thread is the thread that was used to create the watchpoint. */ if (!watchpoint_in_thread_scope (b)) return WP_VALUE_NOT_CHANGED; if (b->exp_valid_block == NULL) within_current_scope = 1; else { struct frame_info *frame = get_current_frame (); struct gdbarch *frame_arch = get_frame_arch (frame); CORE_ADDR frame_pc = get_frame_pc (frame); /* in_function_epilogue_p() returns a non-zero value if we're still in the function but the stack frame has already been invalidated. Since we can't rely on the values of local variables after the stack has been destroyed, we are treating the watchpoint in that state as `not changed' without further checking. Don't mark watchpoints as changed if the current frame is in an epilogue - even if they are in some other frame, our view of the stack is likely to be wrong and frame_find_by_id could error out. */ if (gdbarch_in_function_epilogue_p (frame_arch, frame_pc)) return WP_VALUE_NOT_CHANGED; fr = frame_find_by_id (b->watchpoint_frame); within_current_scope = (fr != NULL); /* If we've gotten confused in the unwinder, we might have returned a frame that can't describe this variable. */ if (within_current_scope) { struct symbol *function; function = get_frame_function (fr); if (function == NULL || !contained_in (b->exp_valid_block, SYMBOL_BLOCK_VALUE (function))) within_current_scope = 0; } if (within_current_scope) /* If we end up stopping, the current frame will get selected in normal_stop. So this call to select_frame won't affect the user. */ select_frame (fr); } if (within_current_scope) { /* We use value_{,free_to_}mark because it could be a *long* time before we return to the command level and call free_all_values. We can't call free_all_values because we might be in the middle of evaluating a function call. */ struct value *mark = value_mark (); struct value *new_val; fetch_watchpoint_value (b->exp, &new_val, NULL, NULL); /* We use value_equal_contents instead of value_equal because the latter coerces an array to a pointer, thus comparing just the address of the array instead of its contents. This is not what we want. */ if ((b->val != NULL) != (new_val != NULL) || (b->val != NULL && !value_equal_contents (b->val, new_val))) { if (new_val != NULL) { release_value (new_val); value_free_to_mark (mark); } bs->old_val = b->val; b->val = new_val; b->val_valid = 1; /* We will stop here */ return WP_VALUE_CHANGED; } else { /* Nothing changed, don't do anything. */ value_free_to_mark (mark); /* We won't stop here */ return WP_VALUE_NOT_CHANGED; } } else { /* This seems like the only logical thing to do because if we temporarily ignored the watchpoint, then when we reenter the block in which it is valid it contains garbage (in the case of a function, it may have two garbage values, one before and one after the prologue). So we can't even detect the first assignment to it and watch after that (since the garbage may or may not equal the first value assigned). */ /* We print all the stop information in print_it_typical(), but in this case, by the time we call print_it_typical() this bp will be deleted already. So we have no choice but print the information here. */ if (ui_out_is_mi_like_p (uiout)) ui_out_field_string (uiout, "reason", async_reason_lookup (EXEC_ASYNC_WATCHPOINT_SCOPE)); ui_out_text (uiout, "\nWatchpoint "); ui_out_field_int (uiout, "wpnum", b->number); ui_out_text (uiout, " deleted because the program has left the block in\n\ which its expression is valid.\n"); if (b->related_breakpoint) b->related_breakpoint->disposition = disp_del_at_next_stop; b->disposition = disp_del_at_next_stop; return WP_DELETED; } } /* Return true if it looks like target has stopped due to hitting breakpoint location BL. This function does not check if we should stop, only if BL explains the stop. */ static int bpstat_check_location (const struct bp_location *bl, struct address_space *aspace, CORE_ADDR bp_addr) { struct breakpoint *b = bl->owner; /* By definition, the inferior does not report stops at tracepoints. */ if (tracepoint_type (b)) return 0; if (b->type != bp_watchpoint && b->type != bp_hardware_watchpoint && b->type != bp_read_watchpoint && b->type != bp_access_watchpoint && b->type != bp_hardware_breakpoint && b->type != bp_catchpoint) /* a non-watchpoint bp */ { if (!breakpoint_address_match (bl->pspace->aspace, bl->address, aspace, bp_addr)) return 0; if (overlay_debugging /* unmapped overlay section */ && section_is_overlay (bl->section) && !section_is_mapped (bl->section)) return 0; } /* Continuable hardware watchpoints are treated as non-existent if the reason we stopped wasn't a hardware watchpoint (we didn't stop on some data address). Otherwise gdb won't stop on a break instruction in the code (not from a breakpoint) when a hardware watchpoint has been defined. Also skip watchpoints which we know did not trigger (did not match the data address). */ if ((b->type == bp_hardware_watchpoint || b->type == bp_read_watchpoint || b->type == bp_access_watchpoint) && b->watchpoint_triggered == watch_triggered_no) return 0; if (b->type == bp_hardware_breakpoint) { if (bl->address != bp_addr) return 0; if (overlay_debugging /* unmapped overlay section */ && section_is_overlay (bl->section) && !section_is_mapped (bl->section)) return 0; } if (b->type == bp_catchpoint) { gdb_assert (b->ops != NULL && b->ops->breakpoint_hit != NULL); if (!b->ops->breakpoint_hit (b)) return 0; } return 1; } /* If BS refers to a watchpoint, determine if the watched values has actually changed, and we should stop. If not, set BS->stop to 0. */ static void bpstat_check_watchpoint (bpstat bs) { const struct bp_location *bl = bs->breakpoint_at; struct breakpoint *b = bl->owner; if (b->type == bp_watchpoint || b->type == bp_read_watchpoint || b->type == bp_access_watchpoint || b->type == bp_hardware_watchpoint) { CORE_ADDR addr; struct value *v; int must_check_value = 0; if (b->type == bp_watchpoint) /* For a software watchpoint, we must always check the watched value. */ must_check_value = 1; else if (b->watchpoint_triggered == watch_triggered_yes) /* We have a hardware watchpoint (read, write, or access) and the target earlier reported an address watched by this watchpoint. */ must_check_value = 1; else if (b->watchpoint_triggered == watch_triggered_unknown && b->type == bp_hardware_watchpoint) /* We were stopped by a hardware watchpoint, but the target could not report the data address. We must check the watchpoint's value. Access and read watchpoints are out of luck; without a data address, we can't figure it out. */ must_check_value = 1; if (must_check_value) { char *message = xstrprintf ("Error evaluating expression for watchpoint %d\n", b->number); struct cleanup *cleanups = make_cleanup (xfree, message); int e = catch_errors (watchpoint_check, bs, message, RETURN_MASK_ALL); do_cleanups (cleanups); switch (e) { case WP_DELETED: /* We've already printed what needs to be printed. */ bs->print_it = print_it_done; /* Stop. */ break; case WP_VALUE_CHANGED: if (b->type == bp_read_watchpoint) { /* Don't stop: read watchpoints shouldn't fire if the value has changed. This is for targets which cannot set read-only watchpoints. */ bs->print_it = print_it_noop; bs->stop = 0; } break; case WP_VALUE_NOT_CHANGED: if (b->type == bp_hardware_watchpoint || b->type == bp_watchpoint) { /* Don't stop: write watchpoints shouldn't fire if the value hasn't changed. */ bs->print_it = print_it_noop; bs->stop = 0; } /* Stop. */ break; default: /* Can't happen. */ case 0: /* Error from catch_errors. */ printf_filtered (_("Watchpoint %d deleted.\n"), b->number); if (b->related_breakpoint) b->related_breakpoint->disposition = disp_del_at_next_stop; b->disposition = disp_del_at_next_stop; /* We've already printed what needs to be printed. */ bs->print_it = print_it_done; break; } } else /* must_check_value == 0 */ { /* This is a case where some watchpoint(s) triggered, but not at the address of this watchpoint, or else no watchpoint triggered after all. So don't print anything for this watchpoint. */ bs->print_it = print_it_noop; bs->stop = 0; } } } /* Check conditions (condition proper, frame, thread and ignore count) of breakpoint referred to by BS. If we should not stop for this breakpoint, set BS->stop to 0. */ static void bpstat_check_breakpoint_conditions (bpstat bs, ptid_t ptid) { int thread_id = pid_to_thread_id (ptid); const struct bp_location *bl = bs->breakpoint_at; struct breakpoint *b = bl->owner; if (frame_id_p (b->frame_id) && !frame_id_eq (b->frame_id, get_stack_frame_id (get_current_frame ()))) bs->stop = 0; else if (bs->stop) { int value_is_zero = 0; /* If this is a scope breakpoint, mark the associated watchpoint as triggered so that we will handle the out-of-scope event. We'll get to the watchpoint next iteration. */ if (b->type == bp_watchpoint_scope) b->related_breakpoint->watchpoint_triggered = watch_triggered_yes; if (bl->cond && bl->owner->disposition != disp_del_at_next_stop) { /* We use value_mark and value_free_to_mark because it could be a long time before we return to the command level and call free_all_values. We can't call free_all_values because we might be in the middle of evaluating a function call. */ struct value *mark = value_mark (); /* Need to select the frame, with all that implies so that the conditions will have the right context. Because we use the frame, we will not see an inlined function's variables when we arrive at a breakpoint at the start of the inlined function; the current frame will be the call site. */ select_frame (get_current_frame ()); value_is_zero = catch_errors (breakpoint_cond_eval, (bl->cond), "Error in testing breakpoint condition:\n", RETURN_MASK_ALL); /* FIXME-someday, should give breakpoint # */ value_free_to_mark (mark); } if (bl->cond && value_is_zero) { bs->stop = 0; } else if (b->thread != -1 && b->thread != thread_id) { bs->stop = 0; } else if (b->ignore_count > 0) { b->ignore_count--; annotate_ignore_count_change (); bs->stop = 0; /* Increase the hit count even though we don't stop. */ ++(b->hit_count); } } } /* Get a bpstat associated with having just stopped at address BP_ADDR in thread PTID. Determine whether we stopped at a breakpoint, etc, or whether we don't understand this stop. Result is a chain of bpstat's such that: if we don't understand the stop, the result is a null pointer. if we understand why we stopped, the result is not null. Each element of the chain refers to a particular breakpoint or watchpoint at which we have stopped. (We may have stopped for several reasons concurrently.) Each element of the chain has valid next, breakpoint_at, commands, FIXME??? fields. */ bpstat bpstat_stop_status (struct address_space *aspace, CORE_ADDR bp_addr, ptid_t ptid) { struct breakpoint *b = NULL; struct bp_location *bl, **blp_tmp; struct bp_location *loc; /* Root of the chain of bpstat's */ struct bpstats root_bs[1]; /* Pointer to the last thing in the chain currently. */ bpstat bs = root_bs; int ix; int need_remove_insert; /* ALL_BP_LOCATIONS iteration would break across update_global_location_list possibly executed by bpstat_check_breakpoint_conditions's inferior call. */ ALL_BREAKPOINTS (b) { if (!breakpoint_enabled (b) && b->enable_state != bp_permanent) continue; for (bl = b->loc; bl != NULL; bl = bl->next) { /* For hardware watchpoints, we look only at the first location. The watchpoint_check function will work on entire expression, not the individual locations. For read watchopints, the watchpoints_triggered function have checked all locations already. */ if (b->type == bp_hardware_watchpoint && bl != b->loc) break; if (bl->shlib_disabled) continue; if (!bpstat_check_location (bl, aspace, bp_addr)) continue; /* Come here if it's a watchpoint, or if the break address matches */ bs = bpstat_alloc (bl, bs); /* Alloc a bpstat to explain stop */ /* Assume we stop. Should we find watchpoint that is not actually triggered, or if condition of breakpoint is false, we'll reset 'stop' to 0. */ bs->stop = 1; bs->print = 1; bpstat_check_watchpoint (bs); if (!bs->stop) continue; if (b->type == bp_thread_event || b->type == bp_overlay_event || b->type == bp_longjmp_master) /* We do not stop for these. */ bs->stop = 0; else bpstat_check_breakpoint_conditions (bs, ptid); if (bs->stop) { ++(b->hit_count); /* We will stop here */ if (b->disposition == disp_disable) { if (b->enable_state != bp_permanent) b->enable_state = bp_disabled; update_global_location_list (0); } if (b->silent) bs->print = 0; bs->commands = b->commands; if (bs->commands && (strcmp ("silent", bs->commands->line) == 0 || (xdb_commands && strcmp ("Q", bs->commands->line) == 0))) { bs->commands = bs->commands->next; bs->print = 0; } bs->commands = copy_command_lines (bs->commands); } /* Print nothing for this entry if we dont stop or dont print. */ if (bs->stop == 0 || bs->print == 0) bs->print_it = print_it_noop; } } for (ix = 0; VEC_iterate (bp_location_p, moribund_locations, ix, loc); ++ix) { if (breakpoint_address_match (loc->pspace->aspace, loc->address, aspace, bp_addr)) { bs = bpstat_alloc (loc, bs); /* For hits of moribund locations, we should just proceed. */ bs->stop = 0; bs->print = 0; bs->print_it = print_it_noop; } } bs->next = NULL; /* Terminate the chain */ /* If we aren't stopping, the value of some hardware watchpoint may not have changed, but the intermediate memory locations we are watching may have. Don't bother if we're stopping; this will get done later. */ for (bs = root_bs->next; bs != NULL; bs = bs->next) if (bs->stop) break; need_remove_insert = 0; if (bs == NULL) for (bs = root_bs->next; bs != NULL; bs = bs->next) if (!bs->stop && bs->breakpoint_at->owner && is_hardware_watchpoint (bs->breakpoint_at->owner)) { update_watchpoint (bs->breakpoint_at->owner, 0 /* don't reparse. */); /* Updating watchpoints invalidates bs->breakpoint_at. Prevent further code from trying to use it. */ bs->breakpoint_at = NULL; need_remove_insert = 1; } if (need_remove_insert) update_global_location_list (1); return root_bs->next; } /* Tell what to do about this bpstat. */ struct bpstat_what bpstat_what (bpstat bs) { /* Classify each bpstat as one of the following. */ enum class { /* This bpstat element has no effect on the main_action. */ no_effect = 0, /* There was a watchpoint, stop but don't print. */ wp_silent, /* There was a watchpoint, stop and print. */ wp_noisy, /* There was a breakpoint but we're not stopping. */ bp_nostop, /* There was a breakpoint, stop but don't print. */ bp_silent, /* There was a breakpoint, stop and print. */ bp_noisy, /* We hit the longjmp breakpoint. */ long_jump, /* We hit the longjmp_resume breakpoint. */ long_resume, /* We hit the step_resume breakpoint. */ step_resume, /* We hit the shared library event breakpoint. */ shlib_event, /* We hit the jit event breakpoint. */ jit_event, /* This is just used to count how many enums there are. */ class_last }; /* Here is the table which drives this routine. So that we can format it pretty, we define some abbreviations for the enum bpstat_what codes. */ #define kc BPSTAT_WHAT_KEEP_CHECKING #define ss BPSTAT_WHAT_STOP_SILENT #define sn BPSTAT_WHAT_STOP_NOISY #define sgl BPSTAT_WHAT_SINGLE #define slr BPSTAT_WHAT_SET_LONGJMP_RESUME #define clr BPSTAT_WHAT_CLEAR_LONGJMP_RESUME #define sr BPSTAT_WHAT_STEP_RESUME #define shl BPSTAT_WHAT_CHECK_SHLIBS #define jit BPSTAT_WHAT_CHECK_JIT /* "Can't happen." Might want to print an error message. abort() is not out of the question, but chances are GDB is just a bit confused, not unusable. */ #define err BPSTAT_WHAT_STOP_NOISY /* Given an old action and a class, come up with a new action. */ /* One interesting property of this table is that wp_silent is the same as bp_silent and wp_noisy is the same as bp_noisy. That is because after stopping, the check for whether to step over a breakpoint (BPSTAT_WHAT_SINGLE type stuff) is handled in proceed() without reference to how we stopped. We retain separate wp_silent and bp_silent codes in case we want to change that someday. Another possibly interesting property of this table is that there's a partial ordering, priority-like, of the actions. Once you've decided that some action is appropriate, you'll never go back and decide something of a lower priority is better. The ordering is: kc < jit clr sgl shl slr sn sr ss sgl < jit shl slr sn sr ss slr < jit err shl sn sr ss clr < jit err shl sn sr ss ss < jit shl sn sr sn < jit shl sr jit < shl sr shl < sr sr < What I think this means is that we don't need a damned table here. If you just put the rows and columns in the right order, it'd look awfully regular. We could simply walk the bpstat list and choose the highest priority action we find, with a little logic to handle the 'err' cases. */ /* step_resume entries: a step resume breakpoint overrides another breakpoint of signal handling (see comment in wait_for_inferior at where we set the step_resume breakpoint). */ static const enum bpstat_what_main_action table[(int) class_last][(int) BPSTAT_WHAT_LAST] = { /* old action */ /* kc ss sn sgl slr clr sr shl jit */ /* no_effect */ {kc, ss, sn, sgl, slr, clr, sr, shl, jit}, /* wp_silent */ {ss, ss, sn, ss, ss, ss, sr, shl, jit}, /* wp_noisy */ {sn, sn, sn, sn, sn, sn, sr, shl, jit}, /* bp_nostop */ {sgl, ss, sn, sgl, slr, slr, sr, shl, jit}, /* bp_silent */ {ss, ss, sn, ss, ss, ss, sr, shl, jit}, /* bp_noisy */ {sn, sn, sn, sn, sn, sn, sr, shl, jit}, /* long_jump */ {slr, ss, sn, slr, slr, err, sr, shl, jit}, /* long_resume */ {clr, ss, sn, err, err, err, sr, shl, jit}, /* step_resume */ {sr, sr, sr, sr, sr, sr, sr, sr, sr }, /* shlib */ {shl, shl, shl, shl, shl, shl, sr, shl, shl}, /* jit_event */ {jit, jit, jit, jit, jit, jit, sr, jit, jit} }; #undef kc #undef ss #undef sn #undef sgl #undef slr #undef clr #undef err #undef sr #undef ts #undef shl #undef jit enum bpstat_what_main_action current_action = BPSTAT_WHAT_KEEP_CHECKING; struct bpstat_what retval; retval.call_dummy = 0; for (; bs != NULL; bs = bs->next) { enum class bs_class = no_effect; if (bs->breakpoint_at == NULL) /* I suspect this can happen if it was a momentary breakpoint which has since been deleted. */ continue; if (bs->breakpoint_at->owner == NULL) bs_class = bp_nostop; else switch (bs->breakpoint_at->owner->type) { case bp_none: continue; case bp_breakpoint: case bp_hardware_breakpoint: case bp_until: case bp_finish: if (bs->stop) { if (bs->print) bs_class = bp_noisy; else bs_class = bp_silent; } else bs_class = bp_nostop; break; case bp_watchpoint: case bp_hardware_watchpoint: case bp_read_watchpoint: case bp_access_watchpoint: if (bs->stop) { if (bs->print) bs_class = wp_noisy; else bs_class = wp_silent; } else /* There was a watchpoint, but we're not stopping. This requires no further action. */ bs_class = no_effect; break; case bp_longjmp: bs_class = long_jump; break; case bp_longjmp_resume: bs_class = long_resume; break; case bp_step_resume: if (bs->stop) { bs_class = step_resume; } else /* It is for the wrong frame. */ bs_class = bp_nostop; break; case bp_watchpoint_scope: bs_class = bp_nostop; break; case bp_shlib_event: bs_class = shlib_event; break; case bp_jit_event: bs_class = jit_event; break; case bp_thread_event: case bp_overlay_event: case bp_longjmp_master: bs_class = bp_nostop; break; case bp_catchpoint: if (bs->stop) { if (bs->print) bs_class = bp_noisy; else bs_class = bp_silent; } else /* There was a catchpoint, but we're not stopping. This requires no further action. */ bs_class = no_effect; break; case bp_call_dummy: /* Make sure the action is stop (silent or noisy), so infrun.c pops the dummy frame. */ bs_class = bp_silent; retval.call_dummy = 1; break; case bp_tracepoint: case bp_fast_tracepoint: /* Tracepoint hits should not be reported back to GDB, and if one got through somehow, it should have been filtered out already. */ internal_error (__FILE__, __LINE__, _("bpstat_what: tracepoint encountered")); break; } current_action = table[(int) bs_class][(int) current_action]; } retval.main_action = current_action; return retval; } /* Nonzero if we should step constantly (e.g. watchpoints on machines without hardware support). This isn't related to a specific bpstat, just to things like whether watchpoints are set. */ int bpstat_should_step (void) { struct breakpoint *b; ALL_BREAKPOINTS (b) if (breakpoint_enabled (b) && b->type == bp_watchpoint && b->loc != NULL) return 1; return 0; } int bpstat_causes_stop (bpstat bs) { for (; bs != NULL; bs = bs->next) if (bs->stop) return 1; return 0; } /* Print the LOC location out of the list of B->LOC locations. */ static void print_breakpoint_location (struct breakpoint *b, struct bp_location *loc, char *wrap_indent, struct ui_stream *stb) { struct cleanup *old_chain = save_current_program_space (); if (loc != NULL && loc->shlib_disabled) loc = NULL; if (loc != NULL) set_current_program_space (loc->pspace); if (b->source_file && loc) { struct symbol *sym = find_pc_sect_function (loc->address, loc->section); if (sym) { ui_out_text (uiout, "in "); ui_out_field_string (uiout, "func", SYMBOL_PRINT_NAME (sym)); ui_out_wrap_hint (uiout, wrap_indent); ui_out_text (uiout, " at "); } ui_out_field_string (uiout, "file", b->source_file); ui_out_text (uiout, ":"); if (ui_out_is_mi_like_p (uiout)) { struct symtab_and_line sal = find_pc_line (loc->address, 0); char *fullname = symtab_to_fullname (sal.symtab); if (fullname) ui_out_field_string (uiout, "fullname", fullname); } ui_out_field_int (uiout, "line", b->line_number); } else if (loc) { print_address_symbolic (loc->gdbarch, loc->address, stb->stream, demangle, ""); ui_out_field_stream (uiout, "at", stb); } else ui_out_field_string (uiout, "pending", b->addr_string); do_cleanups (old_chain); } /* Print B to gdb_stdout. */ static void print_one_breakpoint_location (struct breakpoint *b, struct bp_location *loc, int loc_number, struct bp_location **last_loc, int print_address_bits, int allflag) { struct command_line *l; struct symbol *sym; struct ep_type_description { enum bptype type; char *description; }; static struct ep_type_description bptypes[] = { {bp_none, "?deleted?"}, {bp_breakpoint, "breakpoint"}, {bp_hardware_breakpoint, "hw breakpoint"}, {bp_until, "until"}, {bp_finish, "finish"}, {bp_watchpoint, "watchpoint"}, {bp_hardware_watchpoint, "hw watchpoint"}, {bp_read_watchpoint, "read watchpoint"}, {bp_access_watchpoint, "acc watchpoint"}, {bp_longjmp, "longjmp"}, {bp_longjmp_resume, "longjmp resume"}, {bp_step_resume, "step resume"}, {bp_watchpoint_scope, "watchpoint scope"}, {bp_call_dummy, "call dummy"}, {bp_shlib_event, "shlib events"}, {bp_thread_event, "thread events"}, {bp_overlay_event, "overlay events"}, {bp_longjmp_master, "longjmp master"}, {bp_catchpoint, "catchpoint"}, {bp_tracepoint, "tracepoint"}, {bp_fast_tracepoint, "fast tracepoint"}, {bp_jit_event, "jit events"}, }; static char bpenables[] = "nynny"; char wrap_indent[80]; struct ui_stream *stb = ui_out_stream_new (uiout); struct cleanup *old_chain = make_cleanup_ui_out_stream_delete (stb); struct cleanup *bkpt_chain; int header_of_multiple = 0; int part_of_multiple = (loc != NULL); struct value_print_options opts; get_user_print_options (&opts); gdb_assert (!loc || loc_number != 0); /* See comment in print_one_breakpoint concerning treatment of breakpoints with single disabled location. */ if (loc == NULL && (b->loc != NULL && (b->loc->next != NULL || !b->loc->enabled))) header_of_multiple = 1; if (loc == NULL) loc = b->loc; annotate_record (); bkpt_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "bkpt"); /* 1 */ annotate_field (0); if (part_of_multiple) { char *formatted; formatted = xstrprintf ("%d.%d", b->number, loc_number); ui_out_field_string (uiout, "number", formatted); xfree (formatted); } else { ui_out_field_int (uiout, "number", b->number); } /* 2 */ annotate_field (1); if (part_of_multiple) ui_out_field_skip (uiout, "type"); else { if (((int) b->type >= (sizeof (bptypes) / sizeof (bptypes[0]))) || ((int) b->type != bptypes[(int) b->type].type)) internal_error (__FILE__, __LINE__, _("bptypes table does not describe type #%d."), (int) b->type); ui_out_field_string (uiout, "type", bptypes[(int) b->type].description); } /* 3 */ annotate_field (2); if (part_of_multiple) ui_out_field_skip (uiout, "disp"); else ui_out_field_string (uiout, "disp", bpdisp_text (b->disposition)); /* 4 */ annotate_field (3); if (part_of_multiple) ui_out_field_string (uiout, "enabled", loc->enabled ? "y" : "n"); else ui_out_field_fmt (uiout, "enabled", "%c", bpenables[(int) b->enable_state]); ui_out_spaces (uiout, 2); /* 5 and 6 */ strcpy (wrap_indent, " "); if (opts.addressprint) { if (print_address_bits <= 32) strcat (wrap_indent, " "); else strcat (wrap_indent, " "); } if (b->ops != NULL && b->ops->print_one != NULL) { /* Although the print_one can possibly print all locations, calling it here is not likely to get any nice result. So, make sure there's just one location. */ gdb_assert (b->loc == NULL || b->loc->next == NULL); b->ops->print_one (b, last_loc); } else switch (b->type) { case bp_none: internal_error (__FILE__, __LINE__, _("print_one_breakpoint: bp_none encountered\n")); break; case bp_watchpoint: case bp_hardware_watchpoint: case bp_read_watchpoint: case bp_access_watchpoint: /* Field 4, the address, is omitted (which makes the columns not line up too nicely with the headers, but the effect is relatively readable). */ if (opts.addressprint) ui_out_field_skip (uiout, "addr"); annotate_field (5); ui_out_field_string (uiout, "what", b->exp_string); break; case bp_breakpoint: case bp_hardware_breakpoint: case bp_until: case bp_finish: case bp_longjmp: case bp_longjmp_resume: case bp_step_resume: case bp_watchpoint_scope: case bp_call_dummy: case bp_shlib_event: case bp_thread_event: case bp_overlay_event: case bp_longjmp_master: case bp_tracepoint: case bp_fast_tracepoint: case bp_jit_event: if (opts.addressprint) { annotate_field (4); if (header_of_multiple) ui_out_field_string (uiout, "addr", "<MULTIPLE>"); else if (b->loc == NULL || loc->shlib_disabled) ui_out_field_string (uiout, "addr", "<PENDING>"); else ui_out_field_core_addr (uiout, "addr", loc->gdbarch, loc->address); } annotate_field (5); if (!header_of_multiple) print_breakpoint_location (b, loc, wrap_indent, stb); if (b->loc) *last_loc = b->loc; break; } /* For backward compatibility, don't display inferiors unless there are several. */ if (loc != NULL && !header_of_multiple && (allflag || (!gdbarch_has_global_breakpoints (target_gdbarch) && (number_of_program_spaces () > 1 || number_of_inferiors () > 1) && loc->owner->type != bp_catchpoint))) { struct inferior *inf; int first = 1; for (inf = inferior_list; inf != NULL; inf = inf->next) { if (inf->pspace == loc->pspace) { if (first) { first = 0; ui_out_text (uiout, " inf "); } else ui_out_text (uiout, ", "); ui_out_text (uiout, plongest (inf->num)); } } } if (!part_of_multiple) { if (b->thread != -1) { /* FIXME: This seems to be redundant and lost here; see the "stop only in" line a little further down. */ ui_out_text (uiout, " thread "); ui_out_field_int (uiout, "thread", b->thread); } else if (b->task != 0) { ui_out_text (uiout, " task "); ui_out_field_int (uiout, "task", b->task); } } ui_out_text (uiout, "\n"); if (part_of_multiple && frame_id_p (b->frame_id)) { annotate_field (6); ui_out_text (uiout, "\tstop only in stack frame at "); /* FIXME: cagney/2002-12-01: Shouldn't be poeking around inside the frame ID. */ ui_out_field_core_addr (uiout, "frame", b->gdbarch, b->frame_id.stack_addr); ui_out_text (uiout, "\n"); } if (!part_of_multiple && b->cond_string && !ada_exception_catchpoint_p (b)) { /* We do not print the condition for Ada exception catchpoints because the condition is an internal implementation detail that we do not want to expose to the user. */ annotate_field (7); if (tracepoint_type (b)) ui_out_text (uiout, "\ttrace only if "); else ui_out_text (uiout, "\tstop only if "); ui_out_field_string (uiout, "cond", b->cond_string); ui_out_text (uiout, "\n"); } if (!part_of_multiple && b->thread != -1) { /* FIXME should make an annotation for this */ ui_out_text (uiout, "\tstop only in thread "); ui_out_field_int (uiout, "thread", b->thread); ui_out_text (uiout, "\n"); } if (!part_of_multiple && b->hit_count) { /* FIXME should make an annotation for this */ if (ep_is_catchpoint (b)) ui_out_text (uiout, "\tcatchpoint"); else ui_out_text (uiout, "\tbreakpoint"); ui_out_text (uiout, " already hit "); ui_out_field_int (uiout, "times", b->hit_count); if (b->hit_count == 1) ui_out_text (uiout, " time\n"); else ui_out_text (uiout, " times\n"); } /* Output the count also if it is zero, but only if this is mi. FIXME: Should have a better test for this. */ if (ui_out_is_mi_like_p (uiout)) if (!part_of_multiple && b->hit_count == 0) ui_out_field_int (uiout, "times", b->hit_count); if (!part_of_multiple && b->ignore_count) { annotate_field (8); ui_out_text (uiout, "\tignore next "); ui_out_field_int (uiout, "ignore", b->ignore_count); ui_out_text (uiout, " hits\n"); } l = b->commands; if (!part_of_multiple && l) { struct cleanup *script_chain; annotate_field (9); script_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "script"); print_command_lines (uiout, l, 4); do_cleanups (script_chain); } if (!part_of_multiple && b->pass_count) { annotate_field (10); ui_out_text (uiout, "\tpass count "); ui_out_field_int (uiout, "pass", b->pass_count); ui_out_text (uiout, " \n"); } if (!part_of_multiple && b->step_count) { annotate_field (11); ui_out_text (uiout, "\tstep count "); ui_out_field_int (uiout, "step", b->step_count); ui_out_text (uiout, " \n"); } if (!part_of_multiple && b->actions) { struct action_line *action; annotate_field (12); for (action = b->actions; action; action = action->next) { ui_out_text (uiout, " A\t"); ui_out_text (uiout, action->action); ui_out_text (uiout, "\n"); } } if (ui_out_is_mi_like_p (uiout) && !part_of_multiple) { if (b->addr_string) ui_out_field_string (uiout, "original-location", b->addr_string); else if (b->exp_string) ui_out_field_string (uiout, "original-location", b->exp_string); } do_cleanups (bkpt_chain); do_cleanups (old_chain); } static void print_one_breakpoint (struct breakpoint *b, struct bp_location **last_loc, int print_address_bits, int allflag) { print_one_breakpoint_location (b, NULL, 0, last_loc, print_address_bits, allflag); /* If this breakpoint has custom print function, it's already printed. Otherwise, print individual locations, if any. */ if (b->ops == NULL || b->ops->print_one == NULL) { /* If breakpoint has a single location that is disabled, we print it as if it had several locations, since otherwise it's hard to represent "breakpoint enabled, location disabled" situation. Note that while hardware watchpoints have several locations internally, that's no a property exposed to user. */ if (b->loc && !is_hardware_watchpoint (b) && (b->loc->next || !b->loc->enabled) && !ui_out_is_mi_like_p (uiout)) { struct bp_location *loc; int n = 1; for (loc = b->loc; loc; loc = loc->next, ++n) print_one_breakpoint_location (b, loc, n, last_loc, print_address_bits, allflag); } } } static int breakpoint_address_bits (struct breakpoint *b) { int print_address_bits = 0; struct bp_location *loc; for (loc = b->loc; loc; loc = loc->next) { int addr_bit = gdbarch_addr_bit (loc->gdbarch); if (addr_bit > print_address_bits) print_address_bits = addr_bit; } return print_address_bits; } struct captured_breakpoint_query_args { int bnum; }; static int do_captured_breakpoint_query (struct ui_out *uiout, void *data) { struct captured_breakpoint_query_args *args = data; struct breakpoint *b; struct bp_location *dummy_loc = NULL; ALL_BREAKPOINTS (b) { if (args->bnum == b->number) { int print_address_bits = breakpoint_address_bits (b); print_one_breakpoint (b, &dummy_loc, print_address_bits, 0); return GDB_RC_OK; } } return GDB_RC_NONE; } enum gdb_rc gdb_breakpoint_query (struct ui_out *uiout, int bnum, char **error_message) { struct captured_breakpoint_query_args args; args.bnum = bnum; /* For the moment we don't trust print_one_breakpoint() to not throw an error. */ if (catch_exceptions_with_msg (uiout, do_captured_breakpoint_query, &args, error_message, RETURN_MASK_ALL) < 0) return GDB_RC_FAIL; else return GDB_RC_OK; } /* Return non-zero if B is user settable (breakpoints, watchpoints, catchpoints, et.al.). */ static int user_settable_breakpoint (const struct breakpoint *b) { return (b->type == bp_breakpoint || b->type == bp_catchpoint || b->type == bp_hardware_breakpoint || tracepoint_type (b) || b->type == bp_watchpoint || b->type == bp_read_watchpoint || b->type == bp_access_watchpoint || b->type == bp_hardware_watchpoint); } /* Print information on user settable breakpoint (watchpoint, etc) number BNUM. If BNUM is -1 print all user settable breakpoints. If ALLFLAG is non-zero, include non- user settable breakpoints. */ static void breakpoint_1 (int bnum, int allflag) { struct breakpoint *b; struct bp_location *last_loc = NULL; int nr_printable_breakpoints; struct cleanup *bkpttbl_chain; struct value_print_options opts; int print_address_bits = 0; get_user_print_options (&opts); /* Compute the number of rows in the table, as well as the size required for address fields. */ nr_printable_breakpoints = 0; ALL_BREAKPOINTS (b) if (bnum == -1 || bnum == b->number) { if (allflag || user_settable_breakpoint (b)) { int addr_bit = breakpoint_address_bits (b); if (addr_bit > print_address_bits) print_address_bits = addr_bit; nr_printable_breakpoints++; } } if (opts.addressprint) bkpttbl_chain = make_cleanup_ui_out_table_begin_end (uiout, 6, nr_printable_breakpoints, "BreakpointTable"); else bkpttbl_chain = make_cleanup_ui_out_table_begin_end (uiout, 5, nr_printable_breakpoints, "BreakpointTable"); if (nr_printable_breakpoints > 0) annotate_breakpoints_headers (); if (nr_printable_breakpoints > 0) annotate_field (0); ui_out_table_header (uiout, 7, ui_left, "number", "Num"); /* 1 */ if (nr_printable_breakpoints > 0) annotate_field (1); ui_out_table_header (uiout, 14, ui_left, "type", "Type"); /* 2 */ if (nr_printable_breakpoints > 0) annotate_field (2); ui_out_table_header (uiout, 4, ui_left, "disp", "Disp"); /* 3 */ if (nr_printable_breakpoints > 0) annotate_field (3); ui_out_table_header (uiout, 3, ui_left, "enabled", "Enb"); /* 4 */ if (opts.addressprint) { if (nr_printable_breakpoints > 0) annotate_field (4); if (print_address_bits <= 32) ui_out_table_header (uiout, 10, ui_left, "addr", "Address");/* 5 */ else ui_out_table_header (uiout, 18, ui_left, "addr", "Address");/* 5 */ } if (nr_printable_breakpoints > 0) annotate_field (5); ui_out_table_header (uiout, 40, ui_noalign, "what", "What"); /* 6 */ ui_out_table_body (uiout); if (nr_printable_breakpoints > 0) annotate_breakpoints_table (); ALL_BREAKPOINTS (b) if (bnum == -1 || bnum == b->number) { /* We only print out user settable breakpoints unless the allflag is set. */ if (allflag || user_settable_breakpoint (b)) print_one_breakpoint (b, &last_loc, print_address_bits, allflag); } do_cleanups (bkpttbl_chain); if (nr_printable_breakpoints == 0) { if (bnum == -1) ui_out_message (uiout, 0, "No breakpoints or watchpoints.\n"); else ui_out_message (uiout, 0, "No breakpoint or watchpoint number %d.\n", bnum); } else { if (last_loc && !server_command) set_next_address (last_loc->gdbarch, last_loc->address); } /* FIXME? Should this be moved up so that it is only called when there have been breakpoints? */ annotate_breakpoints_table_end (); } static void breakpoints_info (char *bnum_exp, int from_tty) { int bnum = -1; if (bnum_exp) bnum = parse_and_eval_long (bnum_exp); breakpoint_1 (bnum, 0); } static void maintenance_info_breakpoints (char *bnum_exp, int from_tty) { int bnum = -1; if (bnum_exp) bnum = parse_and_eval_long (bnum_exp); breakpoint_1 (bnum, 1); } static int breakpoint_has_pc (struct breakpoint *b, struct program_space *pspace, CORE_ADDR pc, struct obj_section *section) { struct bp_location *bl = b->loc; for (; bl; bl = bl->next) { if (bl->pspace == pspace && bl->address == pc && (!overlay_debugging || bl->section == section)) return 1; } return 0; } /* Print a message describing any breakpoints set at PC. This concerns with logical breakpoints, so we match program spaces, not address spaces. */ static void describe_other_breakpoints (struct gdbarch *gdbarch, struct program_space *pspace, CORE_ADDR pc, struct obj_section *section, int thread) { int others = 0; struct breakpoint *b; ALL_BREAKPOINTS (b) others += breakpoint_has_pc (b, pspace, pc, section); if (others > 0) { if (others == 1) printf_filtered (_("Note: breakpoint ")); else /* if (others == ???) */ printf_filtered (_("Note: breakpoints ")); ALL_BREAKPOINTS (b) if (breakpoint_has_pc (b, pspace, pc, section)) { others--; printf_filtered ("%d", b->number); if (b->thread == -1 && thread != -1) printf_filtered (" (all threads)"); else if (b->thread != -1) printf_filtered (" (thread %d)", b->thread); printf_filtered ("%s%s ", ((b->enable_state == bp_disabled || b->enable_state == bp_call_disabled || b->enable_state == bp_startup_disabled) ? " (disabled)" : b->enable_state == bp_permanent ? " (permanent)" : ""), (others > 1) ? "," : ((others == 1) ? " and" : "")); } printf_filtered (_("also set at pc ")); fputs_filtered (paddress (gdbarch, pc), gdb_stdout); printf_filtered (".\n"); } } /* Set the default place to put a breakpoint for the `break' command with no arguments. */ void set_default_breakpoint (int valid, struct program_space *pspace, CORE_ADDR addr, struct symtab *symtab, int line) { default_breakpoint_valid = valid; default_breakpoint_pspace = pspace; default_breakpoint_address = addr; default_breakpoint_symtab = symtab; default_breakpoint_line = line; } /* Return true iff it is meaningful to use the address member of BPT. For some breakpoint types, the address member is irrelevant and it makes no sense to attempt to compare it to other addresses (or use it for any other purpose either). More specifically, each of the following breakpoint types will always have a zero valued address and we don't want to mark breakpoints of any of these types to be a duplicate of an actual breakpoint at address zero: bp_watchpoint bp_catchpoint */ static int breakpoint_address_is_meaningful (struct breakpoint *bpt) { enum bptype type = bpt->type; return (type != bp_watchpoint && type != bp_catchpoint); } /* Assuming LOC1 and LOC2's owners are hardware watchpoints, returns true if LOC1 and LOC2 represent the same watchpoint location. */ static int watchpoint_locations_match (struct bp_location *loc1, struct bp_location *loc2) { return (loc1->owner->type == loc2->owner->type && loc1->pspace->aspace == loc2->pspace->aspace && loc1->address == loc2->address && loc1->length == loc2->length); } /* Returns true if {ASPACE1,ADDR1} and {ASPACE2,ADDR2} represent the same breakpoint location. In most targets, this can only be true if ASPACE1 matches ASPACE2. On targets that have global breakpoints, the address space doesn't really matter. */ static int breakpoint_address_match (struct address_space *aspace1, CORE_ADDR addr1, struct address_space *aspace2, CORE_ADDR addr2) { return ((gdbarch_has_global_breakpoints (target_gdbarch) || aspace1 == aspace2) && addr1 == addr2); } /* Assuming LOC1 and LOC2's types' have meaningful target addresses (breakpoint_address_is_meaningful), returns true if LOC1 and LOC2 represent the same location. */ static int breakpoint_locations_match (struct bp_location *loc1, struct bp_location *loc2) { int hw_point1 = is_hardware_watchpoint (loc1->owner); int hw_point2 = is_hardware_watchpoint (loc2->owner); if (hw_point1 != hw_point2) return 0; else if (hw_point1) return watchpoint_locations_match (loc1, loc2); else return breakpoint_address_match (loc1->pspace->aspace, loc1->address, loc2->pspace->aspace, loc2->address); } static void breakpoint_adjustment_warning (CORE_ADDR from_addr, CORE_ADDR to_addr, int bnum, int have_bnum) { char astr1[40]; char astr2[40]; strcpy (astr1, hex_string_custom ((unsigned long) from_addr, 8)); strcpy (astr2, hex_string_custom ((unsigned long) to_addr, 8)); if (have_bnum) warning (_("Breakpoint %d address previously adjusted from %s to %s."), bnum, astr1, astr2); else warning (_("Breakpoint address adjusted from %s to %s."), astr1, astr2); } /* Adjust a breakpoint's address to account for architectural constraints on breakpoint placement. Return the adjusted address. Note: Very few targets require this kind of adjustment. For most targets, this function is simply the identity function. */ static CORE_ADDR adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr, enum bptype bptype) { if (!gdbarch_adjust_breakpoint_address_p (gdbarch)) { /* Very few targets need any kind of breakpoint adjustment. */ return bpaddr; } else if (bptype == bp_watchpoint || bptype == bp_hardware_watchpoint || bptype == bp_read_watchpoint || bptype == bp_access_watchpoint || bptype == bp_catchpoint) { /* Watchpoints and the various bp_catch_* eventpoints should not have their addresses modified. */ return bpaddr; } else { CORE_ADDR adjusted_bpaddr; /* Some targets have architectural constraints on the placement of breakpoint instructions. Obtain the adjusted address. */ adjusted_bpaddr = gdbarch_adjust_breakpoint_address (gdbarch, bpaddr); /* An adjusted breakpoint address can significantly alter a user's expectations. Print a warning if an adjustment is required. */ if (adjusted_bpaddr != bpaddr) breakpoint_adjustment_warning (bpaddr, adjusted_bpaddr, 0, 0); return adjusted_bpaddr; } } /* Allocate a struct bp_location. */ static struct bp_location * allocate_bp_location (struct breakpoint *bpt) { struct bp_location *loc, *loc_p; loc = xmalloc (sizeof (struct bp_location)); memset (loc, 0, sizeof (*loc)); loc->owner = bpt; loc->cond = NULL; loc->shlib_disabled = 0; loc->enabled = 1; switch (bpt->type) { case bp_breakpoint: case bp_until: case bp_finish: case bp_longjmp: case bp_longjmp_resume: case bp_step_resume: case bp_watchpoint_scope: case bp_call_dummy: case bp_shlib_event: case bp_thread_event: case bp_overlay_event: case bp_jit_event: case bp_longjmp_master: loc->loc_type = bp_loc_software_breakpoint; break; case bp_hardware_breakpoint: loc->loc_type = bp_loc_hardware_breakpoint; break; case bp_hardware_watchpoint: case bp_read_watchpoint: case bp_access_watchpoint: loc->loc_type = bp_loc_hardware_watchpoint; break; case bp_watchpoint: case bp_catchpoint: case bp_tracepoint: case bp_fast_tracepoint: loc->loc_type = bp_loc_other; break; default: internal_error (__FILE__, __LINE__, _("unknown breakpoint type")); } return loc; } static void free_bp_location (struct bp_location *loc) { if (loc->cond) xfree (loc->cond); if (loc->function_name) xfree (loc->function_name); xfree (loc); } /* Helper to set_raw_breakpoint below. Creates a breakpoint that has type BPTYPE and has no locations as yet. */ /* This function is used in gdbtk sources and thus can not be made static. */ static struct breakpoint * set_raw_breakpoint_without_location (struct gdbarch *gdbarch, enum bptype bptype) { struct breakpoint *b, *b1; b = (struct breakpoint *) xmalloc (sizeof (struct breakpoint)); memset (b, 0, sizeof (*b)); b->type = bptype; b->gdbarch = gdbarch; b->language = current_language->la_language; b->input_radix = input_radix; b->thread = -1; b->enable_state = bp_enabled; b->next = 0; b->silent = 0; b->ignore_count = 0; b->commands = NULL; b->frame_id = null_frame_id; b->forked_inferior_pid = null_ptid; b->exec_pathname = NULL; b->syscalls_to_be_caught = NULL; b->ops = NULL; b->condition_not_parsed = 0; /* Add this breakpoint to the end of the chain so that a list of breakpoints will come out in order of increasing numbers. */ b1 = breakpoint_chain; if (b1 == 0) breakpoint_chain = b; else { while (b1->next) b1 = b1->next; b1->next = b; } return b; } /* Initialize loc->function_name. */ static void set_breakpoint_location_function (struct bp_location *loc) { if (loc->owner->type == bp_breakpoint || loc->owner->type == bp_hardware_breakpoint || tracepoint_type (loc->owner)) { find_pc_partial_function (loc->address, &(loc->function_name), NULL, NULL); if (loc->function_name) loc->function_name = xstrdup (loc->function_name); } } /* Attempt to determine architecture of location identified by SAL. */ static struct gdbarch * get_sal_arch (struct symtab_and_line sal) { if (sal.section) return get_objfile_arch (sal.section->objfile); if (sal.symtab) return get_objfile_arch (sal.symtab->objfile); return NULL; } /* set_raw_breakpoint is a low level routine for allocating and partially initializing a breakpoint of type BPTYPE. The newly created breakpoint's address, section, source file name, and line number are provided by SAL. The newly created and partially initialized breakpoint is added to the breakpoint chain and is also returned as the value of this function. It is expected that the caller will complete the initialization of the newly created breakpoint struct as well as output any status information regarding the creation of a new breakpoint. In particular, set_raw_breakpoint does NOT set the breakpoint number! Care should be taken to not allow an error to occur prior to completing the initialization of the breakpoint. If this should happen, a bogus breakpoint will be left on the chain. */ struct breakpoint * set_raw_breakpoint (struct gdbarch *gdbarch, struct symtab_and_line sal, enum bptype bptype) { struct breakpoint *b = set_raw_breakpoint_without_location (gdbarch, bptype); CORE_ADDR adjusted_address; struct gdbarch *loc_gdbarch; loc_gdbarch = get_sal_arch (sal); if (!loc_gdbarch) loc_gdbarch = b->gdbarch; if (bptype != bp_catchpoint) gdb_assert (sal.pspace != NULL); /* Adjust the breakpoint's address prior to allocating a location. Once we call allocate_bp_location(), that mostly uninitialized location will be placed on the location chain. Adjustment of the breakpoint may cause target_read_memory() to be called and we do not want its scan of the location chain to find a breakpoint and location that's only been partially initialized. */ adjusted_address = adjust_breakpoint_address (loc_gdbarch, sal.pc, b->type); b->loc = allocate_bp_location (b); b->loc->gdbarch = loc_gdbarch; b->loc->requested_address = sal.pc; b->loc->address = adjusted_address; b->loc->pspace = sal.pspace; /* Store the program space that was used to set the breakpoint, for breakpoint resetting. */ b->pspace = sal.pspace; if (sal.symtab == NULL) b->source_file = NULL; else b->source_file = xstrdup (sal.symtab->filename); b->loc->section = sal.section; b->line_number = sal.line; set_breakpoint_location_function (b->loc); breakpoints_changed (); return b; } /* Note that the breakpoint object B describes a permanent breakpoint instruction, hard-wired into the inferior's code. */ void make_breakpoint_permanent (struct breakpoint *b) { struct bp_location *bl; b->enable_state = bp_permanent; /* By definition, permanent breakpoints are already present in the code. Mark all locations as inserted. For now, make_breakpoint_permanent is called in just one place, so it's hard to say if it's reasonable to have permanent breakpoint with multiple locations or not, but it's easy to implmement. */ for (bl = b->loc; bl; bl = bl->next) bl->inserted = 1; } /* Call this routine when stepping and nexting to enable a breakpoint if we do a longjmp() in THREAD. When we hit that breakpoint, call set_longjmp_resume_breakpoint() to figure out where we are going. */ void set_longjmp_breakpoint (int thread) { struct breakpoint *b, *temp; /* To avoid having to rescan all objfile symbols at every step, we maintain a list of continually-inserted but always disabled longjmp "master" breakpoints. Here, we simply create momentary clones of those and enable them for the requested thread. */ ALL_BREAKPOINTS_SAFE (b, temp) if (b->pspace == current_program_space && b->type == bp_longjmp_master) { struct breakpoint *clone = clone_momentary_breakpoint (b); clone->type = bp_longjmp; clone->thread = thread; } } /* Delete all longjmp breakpoints from THREAD. */ void delete_longjmp_breakpoint (int thread) { struct breakpoint *b, *temp; ALL_BREAKPOINTS_SAFE (b, temp) if (b->type == bp_longjmp) { if (b->thread == thread) delete_breakpoint (b); } } void enable_overlay_breakpoints (void) { struct breakpoint *b; ALL_BREAKPOINTS (b) if (b->type == bp_overlay_event) { b->enable_state = bp_enabled; update_global_location_list (1); overlay_events_enabled = 1; } } void disable_overlay_breakpoints (void) { struct breakpoint *b; ALL_BREAKPOINTS (b) if (b->type == bp_overlay_event) { b->enable_state = bp_disabled; update_global_location_list (0); overlay_events_enabled = 0; } } struct breakpoint * create_thread_event_breakpoint (struct gdbarch *gdbarch, CORE_ADDR address) { struct breakpoint *b; b = create_internal_breakpoint (gdbarch, address, bp_thread_event); b->enable_state = bp_enabled; /* addr_string has to be used or breakpoint_re_set will delete me. */ b->addr_string = xstrprintf ("*%s", paddress (b->loc->gdbarch, b->loc->address)); update_global_location_list_nothrow (1); return b; } void remove_thread_event_breakpoints (void) { struct breakpoint *b, *temp; ALL_BREAKPOINTS_SAFE (b, temp) if (b->type == bp_thread_event && b->loc->pspace == current_program_space) delete_breakpoint (b); } struct captured_parse_breakpoint_args { char **arg_p; struct symtabs_and_lines *sals_p; char ***addr_string_p; int *not_found_ptr; }; struct lang_and_radix { enum language lang; int radix; }; /* Create a breakpoint for JIT code registration and unregistration. */ struct breakpoint * create_jit_event_breakpoint (struct gdbarch *gdbarch, CORE_ADDR address) { struct breakpoint *b; b = create_internal_breakpoint (gdbarch, address, bp_jit_event); update_global_location_list_nothrow (1); return b; } void remove_solib_event_breakpoints (void) { struct breakpoint *b, *temp; ALL_BREAKPOINTS_SAFE (b, temp) if (b->type == bp_shlib_event && b->loc->pspace == current_program_space) delete_breakpoint (b); } struct breakpoint * create_solib_event_breakpoint (struct gdbarch *gdbarch, CORE_ADDR address) { struct breakpoint *b; b = create_internal_breakpoint (gdbarch, address, bp_shlib_event); update_global_location_list_nothrow (1); return b; } /* Disable any breakpoints that are on code in shared libraries. Only apply to enabled breakpoints, disabled ones can just stay disabled. */ void disable_breakpoints_in_shlibs (void) { struct bp_location *loc, **locp_tmp; ALL_BP_LOCATIONS (loc, locp_tmp) { struct breakpoint *b = loc->owner; /* We apply the check to all breakpoints, including disabled for those with loc->duplicate set. This is so that when breakpoint becomes enabled, or the duplicate is removed, gdb will try to insert all breakpoints. If we don't set shlib_disabled here, we'll try to insert those breakpoints and fail. */ if (((b->type == bp_breakpoint) || (b->type == bp_hardware_breakpoint) || (tracepoint_type (b))) && loc->pspace == current_program_space && !loc->shlib_disabled #ifdef PC_SOLIB && PC_SOLIB (loc->address) #else && solib_name_from_address (loc->pspace, loc->address) #endif ) { loc->shlib_disabled = 1; } } } /* Disable any breakpoints that are in in an unloaded shared library. Only apply to enabled breakpoints, disabled ones can just stay disabled. */ static void disable_breakpoints_in_unloaded_shlib (struct so_list *solib) { struct bp_location *loc, **locp_tmp; int disabled_shlib_breaks = 0; /* SunOS a.out shared libraries are always mapped, so do not disable breakpoints; they will only be reported as unloaded through clear_solib when GDB discards its shared library list. See clear_solib for more information. */ if (exec_bfd != NULL && bfd_get_flavour (exec_bfd) == bfd_target_aout_flavour) return; ALL_BP_LOCATIONS (loc, locp_tmp) { struct breakpoint *b = loc->owner; if ((loc->loc_type == bp_loc_hardware_breakpoint || loc->loc_type == bp_loc_software_breakpoint) && solib->pspace == loc->pspace && !loc->shlib_disabled && (b->type == bp_breakpoint || b->type == bp_hardware_breakpoint) && solib_contains_address_p (solib, loc->address)) { loc->shlib_disabled = 1; /* At this point, we cannot rely on remove_breakpoint succeeding so we must mark the breakpoint as not inserted to prevent future errors occurring in remove_breakpoints. */ loc->inserted = 0; if (!disabled_shlib_breaks) { target_terminal_ours_for_output (); warning (_("Temporarily disabling breakpoints for unloaded shared library \"%s\""), solib->so_name); } disabled_shlib_breaks = 1; } } } /* FORK & VFORK catchpoints. */ /* Implement the "insert" breakpoint_ops method for fork catchpoints. */ static void insert_catch_fork (struct breakpoint *b) { target_insert_fork_catchpoint (PIDGET (inferior_ptid)); } /* Implement the "remove" breakpoint_ops method for fork catchpoints. */ static int remove_catch_fork (struct breakpoint *b) { return target_remove_fork_catchpoint (PIDGET (inferior_ptid)); } /* Implement the "breakpoint_hit" breakpoint_ops method for fork catchpoints. */ static int breakpoint_hit_catch_fork (struct breakpoint *b) { return inferior_has_forked (inferior_ptid, &b->forked_inferior_pid); } /* Implement the "print_it" breakpoint_ops method for fork catchpoints. */ static enum print_stop_action print_it_catch_fork (struct breakpoint *b) { annotate_catchpoint (b->number); printf_filtered (_("\nCatchpoint %d (forked process %d), "), b->number, ptid_get_pid (b->forked_inferior_pid)); return PRINT_SRC_AND_LOC; } /* Implement the "print_one" breakpoint_ops method for fork catchpoints. */ static void print_one_catch_fork (struct breakpoint *b, struct bp_location **last_loc) { struct value_print_options opts; get_user_print_options (&opts); /* Field 4, the address, is omitted (which makes the columns not line up too nicely with the headers, but the effect is relatively readable). */ if (opts.addressprint) ui_out_field_skip (uiout, "addr"); annotate_field (5); ui_out_text (uiout, "fork"); if (!ptid_equal (b->forked_inferior_pid, null_ptid)) { ui_out_text (uiout, ", process "); ui_out_field_int (uiout, "what", ptid_get_pid (b->forked_inferior_pid)); ui_out_spaces (uiout, 1); } } /* Implement the "print_mention" breakpoint_ops method for fork catchpoints. */ static void print_mention_catch_fork (struct breakpoint *b) { printf_filtered (_("Catchpoint %d (fork)"), b->number); } /* The breakpoint_ops structure to be used in fork catchpoints. */ static struct breakpoint_ops catch_fork_breakpoint_ops = { insert_catch_fork, remove_catch_fork, breakpoint_hit_catch_fork, print_it_catch_fork, print_one_catch_fork, print_mention_catch_fork }; /* Implement the "insert" breakpoint_ops method for vfork catchpoints. */ static void insert_catch_vfork (struct breakpoint *b) { target_insert_vfork_catchpoint (PIDGET (inferior_ptid)); } /* Implement the "remove" breakpoint_ops method for vfork catchpoints. */ static int remove_catch_vfork (struct breakpoint *b) { return target_remove_vfork_catchpoint (PIDGET (inferior_ptid)); } /* Implement the "breakpoint_hit" breakpoint_ops method for vfork catchpoints. */ static int breakpoint_hit_catch_vfork (struct breakpoint *b) { return inferior_has_vforked (inferior_ptid, &b->forked_inferior_pid); } /* Implement the "print_it" breakpoint_ops method for vfork catchpoints. */ static enum print_stop_action print_it_catch_vfork (struct breakpoint *b) { annotate_catchpoint (b->number); printf_filtered (_("\nCatchpoint %d (vforked process %d), "), b->number, ptid_get_pid (b->forked_inferior_pid)); return PRINT_SRC_AND_LOC; } /* Implement the "print_one" breakpoint_ops method for vfork catchpoints. */ static void print_one_catch_vfork (struct breakpoint *b, struct bp_location **last_loc) { struct value_print_options opts; get_user_print_options (&opts); /* Field 4, the address, is omitted (which makes the columns not line up too nicely with the headers, but the effect is relatively readable). */ if (opts.addressprint) ui_out_field_skip (uiout, "addr"); annotate_field (5); ui_out_text (uiout, "vfork"); if (!ptid_equal (b->forked_inferior_pid, null_ptid)) { ui_out_text (uiout, ", process "); ui_out_field_int (uiout, "what", ptid_get_pid (b->forked_inferior_pid)); ui_out_spaces (uiout, 1); } } /* Implement the "print_mention" breakpoint_ops method for vfork catchpoints. */ static void print_mention_catch_vfork (struct breakpoint *b) { printf_filtered (_("Catchpoint %d (vfork)"), b->number); } /* The breakpoint_ops structure to be used in vfork catchpoints. */ static struct breakpoint_ops catch_vfork_breakpoint_ops = { insert_catch_vfork, remove_catch_vfork, breakpoint_hit_catch_vfork, print_it_catch_vfork, print_one_catch_vfork, print_mention_catch_vfork }; /* Implement the "insert" breakpoint_ops method for syscall catchpoints. */ static void insert_catch_syscall (struct breakpoint *b) { struct inferior *inf = current_inferior (); ++inf->total_syscalls_count; if (!b->syscalls_to_be_caught) ++inf->any_syscall_count; else { int i, iter; for (i = 0; VEC_iterate (int, b->syscalls_to_be_caught, i, iter); i++) { int elem; if (iter >= VEC_length (int, inf->syscalls_counts)) { int old_size = VEC_length (int, inf->syscalls_counts); uintptr_t vec_addr_offset = old_size * ((uintptr_t) sizeof (int)); uintptr_t vec_addr; VEC_safe_grow (int, inf->syscalls_counts, iter + 1); vec_addr = (uintptr_t) VEC_address (int, inf->syscalls_counts) + vec_addr_offset; memset ((void *) vec_addr, 0, (iter + 1 - old_size) * sizeof (int)); } elem = VEC_index (int, inf->syscalls_counts, iter); VEC_replace (int, inf->syscalls_counts, iter, ++elem); } } target_set_syscall_catchpoint (PIDGET (inferior_ptid), inf->total_syscalls_count != 0, inf->any_syscall_count, VEC_length (int, inf->syscalls_counts), VEC_address (int, inf->syscalls_counts)); } /* Implement the "remove" breakpoint_ops method for syscall catchpoints. */ static int remove_catch_syscall (struct breakpoint *b) { struct inferior *inf = current_inferior (); --inf->total_syscalls_count; if (!b->syscalls_to_be_caught) --inf->any_syscall_count; else { int i, iter; for (i = 0; VEC_iterate (int, b->syscalls_to_be_caught, i, iter); i++) { int elem; if (iter >= VEC_length (int, inf->syscalls_counts)) /* Shouldn't happen. */ continue; elem = VEC_index (int, inf->syscalls_counts, iter); VEC_replace (int, inf->syscalls_counts, iter, --elem); } } return target_set_syscall_catchpoint (PIDGET (inferior_ptid), inf->total_syscalls_count != 0, inf->any_syscall_count, VEC_length (int, inf->syscalls_counts), VEC_address (int, inf->syscalls_counts)); } /* Implement the "breakpoint_hit" breakpoint_ops method for syscall catchpoints. */ static int breakpoint_hit_catch_syscall (struct breakpoint *b) { /* We must check if we are catching specific syscalls in this breakpoint. If we are, then we must guarantee that the called syscall is the same syscall we are catching. */ int syscall_number = 0; if (!inferior_has_called_syscall (inferior_ptid, &syscall_number)) return 0; /* Now, checking if the syscall is the same. */ if (b->syscalls_to_be_caught) { int i, iter; for (i = 0; VEC_iterate (int, b->syscalls_to_be_caught, i, iter); i++) if (syscall_number == iter) break; /* Not the same. */ if (!iter) return 0; } return 1; } /* Implement the "print_it" breakpoint_ops method for syscall catchpoints. */ static enum print_stop_action print_it_catch_syscall (struct breakpoint *b) { /* These are needed because we want to know in which state a syscall is. It can be in the TARGET_WAITKIND_SYSCALL_ENTRY or TARGET_WAITKIND_SYSCALL_RETURN, and depending on it we must print "called syscall" or "returned from syscall". */ ptid_t ptid; struct target_waitstatus last; struct syscall s; struct cleanup *old_chain; char *syscall_id; get_last_target_status (&ptid, &last); get_syscall_by_number (last.value.syscall_number, &s); annotate_catchpoint (b->number); if (s.name == NULL) syscall_id = xstrprintf ("%d", last.value.syscall_number); else syscall_id = xstrprintf ("'%s'", s.name); old_chain = make_cleanup (xfree, syscall_id); if (last.kind == TARGET_WAITKIND_SYSCALL_ENTRY) printf_filtered (_("\nCatchpoint %d (call to syscall %s), "), b->number, syscall_id); else if (last.kind == TARGET_WAITKIND_SYSCALL_RETURN) printf_filtered (_("\nCatchpoint %d (returned from syscall %s), "), b->number, syscall_id); do_cleanups (old_chain); return PRINT_SRC_AND_LOC; } /* Implement the "print_one" breakpoint_ops method for syscall catchpoints. */ static void print_one_catch_syscall (struct breakpoint *b, struct bp_location **last_loc) { struct value_print_options opts; get_user_print_options (&opts); /* Field 4, the address, is omitted (which makes the columns not line up too nicely with the headers, but the effect is relatively readable). */ if (opts.addressprint) ui_out_field_skip (uiout, "addr"); annotate_field (5); if (b->syscalls_to_be_caught && VEC_length (int, b->syscalls_to_be_caught) > 1) ui_out_text (uiout, "syscalls \""); else ui_out_text (uiout, "syscall \""); if (b->syscalls_to_be_caught) { int i, iter; char *text = xstrprintf ("%s", ""); for (i = 0; VEC_iterate (int, b->syscalls_to_be_caught, i, iter); i++) { char *x = text; struct syscall s; get_syscall_by_number (iter, &s); if (s.name != NULL) text = xstrprintf ("%s%s, ", text, s.name); else text = xstrprintf ("%s%d, ", text, iter); /* We have to xfree the last 'text' (now stored at 'x') because xstrprintf dinamically allocates new space for it on every call. */ xfree (x); } /* Remove the last comma. */ text[strlen (text) - 2] = '\0'; ui_out_field_string (uiout, "what", text); } else ui_out_field_string (uiout, "what", "<any syscall>"); ui_out_text (uiout, "\" "); } /* Implement the "print_mention" breakpoint_ops method for syscall catchpoints. */ static void print_mention_catch_syscall (struct breakpoint *b) { if (b->syscalls_to_be_caught) { int i, iter; if (VEC_length (int, b->syscalls_to_be_caught) > 1) printf_filtered (_("Catchpoint %d (syscalls"), b->number); else printf_filtered (_("Catchpoint %d (syscall"), b->number); for (i = 0; VEC_iterate (int, b->syscalls_to_be_caught, i, iter); i++) { struct syscall s; get_syscall_by_number (iter, &s); if (s.name) printf_filtered (" '%s' [%d]", s.name, s.number); else printf_filtered (" %d", s.number); } printf_filtered (")"); } else printf_filtered (_("Catchpoint %d (any syscall)"), b->number); } /* The breakpoint_ops structure to be used in syscall catchpoints. */ static struct breakpoint_ops catch_syscall_breakpoint_ops = { insert_catch_syscall, remove_catch_syscall, breakpoint_hit_catch_syscall, print_it_catch_syscall, print_one_catch_syscall, print_mention_catch_syscall }; /* Returns non-zero if 'b' is a syscall catchpoint. */ static int syscall_catchpoint_p (struct breakpoint *b) { return (b->ops == &catch_syscall_breakpoint_ops); } /* Create a new breakpoint of the bp_catchpoint kind and return it, but does NOT mention it nor update the global location list. This is useful if you need to fill more fields in the struct breakpoint before calling mention. If TEMPFLAG is non-zero, then make the breakpoint temporary. If COND_STRING is not NULL, then store it in the breakpoint. OPS, if not NULL, is the breakpoint_ops structure associated to the catchpoint. */ static struct breakpoint * create_catchpoint_without_mention (struct gdbarch *gdbarch, int tempflag, char *cond_string, struct breakpoint_ops *ops) { struct symtab_and_line sal; struct breakpoint *b; init_sal (&sal); sal.pspace = current_program_space; b = set_raw_breakpoint (gdbarch, sal, bp_catchpoint); set_breakpoint_count (breakpoint_count + 1); b->number = breakpoint_count; b->cond_string = (cond_string == NULL) ? NULL : xstrdup (cond_string); b->thread = -1; b->addr_string = NULL; b->enable_state = bp_enabled; b->disposition = tempflag ? disp_del : disp_donttouch; b->ops = ops; return b; } /* Create a new breakpoint of the bp_catchpoint kind and return it. If TEMPFLAG is non-zero, then make the breakpoint temporary. If COND_STRING is not NULL, then store it in the breakpoint. OPS, if not NULL, is the breakpoint_ops structure associated to the catchpoint. */ static struct breakpoint * create_catchpoint (struct gdbarch *gdbarch, int tempflag, char *cond_string, struct breakpoint_ops *ops) { struct breakpoint *b = create_catchpoint_without_mention (gdbarch, tempflag, cond_string, ops); mention (b); update_global_location_list (1); return b; } static void create_fork_vfork_event_catchpoint (struct gdbarch *gdbarch, int tempflag, char *cond_string, struct breakpoint_ops *ops) { struct breakpoint *b = create_catchpoint (gdbarch, tempflag, cond_string, ops); /* FIXME: We should put this information in a breakpoint private data area. */ b->forked_inferior_pid = null_ptid; } /* Exec catchpoints. */ static void insert_catch_exec (struct breakpoint *b) { target_insert_exec_catchpoint (PIDGET (inferior_ptid)); } static int remove_catch_exec (struct breakpoint *b) { return target_remove_exec_catchpoint (PIDGET (inferior_ptid)); } static int breakpoint_hit_catch_exec (struct breakpoint *b) { return inferior_has_execd (inferior_ptid, &b->exec_pathname); } static enum print_stop_action print_it_catch_exec (struct breakpoint *b) { annotate_catchpoint (b->number); printf_filtered (_("\nCatchpoint %d (exec'd %s), "), b->number, b->exec_pathname); return PRINT_SRC_AND_LOC; } static void print_one_catch_exec (struct breakpoint *b, struct bp_location **last_loc) { struct value_print_options opts; get_user_print_options (&opts); /* Field 4, the address, is omitted (which makes the columns not line up too nicely with the headers, but the effect is relatively readable). */ if (opts.addressprint) ui_out_field_skip (uiout, "addr"); annotate_field (5); ui_out_text (uiout, "exec"); if (b->exec_pathname != NULL) { ui_out_text (uiout, ", program \""); ui_out_field_string (uiout, "what", b->exec_pathname); ui_out_text (uiout, "\" "); } } static void print_mention_catch_exec (struct breakpoint *b) { printf_filtered (_("Catchpoint %d (exec)"), b->number); } static struct breakpoint_ops catch_exec_breakpoint_ops = { insert_catch_exec, remove_catch_exec, breakpoint_hit_catch_exec, print_it_catch_exec, print_one_catch_exec, print_mention_catch_exec }; static void create_syscall_event_catchpoint (int tempflag, VEC(int) *filter, struct breakpoint_ops *ops) { struct gdbarch *gdbarch = get_current_arch (); struct breakpoint *b = create_catchpoint_without_mention (gdbarch, tempflag, NULL, ops); b->syscalls_to_be_caught = filter; /* Now, we have to mention the breakpoint and update the global location list. */ mention (b); update_global_location_list (1); } static int hw_breakpoint_used_count (void) { struct breakpoint *b; int i = 0; ALL_BREAKPOINTS (b) { if (b->type == bp_hardware_breakpoint && breakpoint_enabled (b)) i++; } return i; } static int hw_watchpoint_used_count (enum bptype type, int *other_type_used) { struct breakpoint *b; int i = 0; *other_type_used = 0; ALL_BREAKPOINTS (b) { if (breakpoint_enabled (b)) { if (b->type == type) i++; else if ((b->type == bp_hardware_watchpoint || b->type == bp_read_watchpoint || b->type == bp_access_watchpoint)) *other_type_used = 1; } } return i; } void disable_watchpoints_before_interactive_call_start (void) { struct breakpoint *b; ALL_BREAKPOINTS (b) { if (((b->type == bp_watchpoint) || (b->type == bp_hardware_watchpoint) || (b->type == bp_read_watchpoint) || (b->type == bp_access_watchpoint)) && breakpoint_enabled (b)) { b->enable_state = bp_call_disabled; update_global_location_list (0); } } } void enable_watchpoints_after_interactive_call_stop (void) { struct breakpoint *b; ALL_BREAKPOINTS (b) { if (((b->type == bp_watchpoint) || (b->type == bp_hardware_watchpoint) || (b->type == bp_read_watchpoint) || (b->type == bp_access_watchpoint)) && (b->enable_state == bp_call_disabled)) { b->enable_state = bp_enabled; update_global_location_list (1); } } } void disable_breakpoints_before_startup (void) { struct breakpoint *b; int found = 0; ALL_BREAKPOINTS (b) { if (b->pspace != current_program_space) continue; if ((b->type == bp_breakpoint || b->type == bp_hardware_breakpoint) && breakpoint_enabled (b)) { b->enable_state = bp_startup_disabled; found = 1; } } if (found) update_global_location_list (0); current_program_space->executing_startup = 1; } void enable_breakpoints_after_startup (void) { struct breakpoint *b; int found = 0; current_program_space->executing_startup = 0; ALL_BREAKPOINTS (b) { if (b->pspace != current_program_space) continue; if ((b->type == bp_breakpoint || b->type == bp_hardware_breakpoint) && b->enable_state == bp_startup_disabled) { b->enable_state = bp_enabled; found = 1; } } if (found) breakpoint_re_set (); } /* Set a breakpoint that will evaporate an end of command at address specified by SAL. Restrict it to frame FRAME if FRAME is nonzero. */ struct breakpoint * set_momentary_breakpoint (struct gdbarch *gdbarch, struct symtab_and_line sal, struct frame_id frame_id, enum bptype type) { struct breakpoint *b; /* If FRAME_ID is valid, it should be a real frame, not an inlined one. */ gdb_assert (!frame_id_inlined_p (frame_id)); b = set_raw_breakpoint (gdbarch, sal, type); b->enable_state = bp_enabled; b->disposition = disp_donttouch; b->frame_id = frame_id; /* If we're debugging a multi-threaded program, then we want momentary breakpoints to be active in only a single thread of control. */ if (in_thread_list (inferior_ptid)) b->thread = pid_to_thread_id (inferior_ptid); update_global_location_list_nothrow (1); return b; } /* Make a deep copy of momentary breakpoint ORIG. Returns NULL if ORIG is NULL. */ struct breakpoint * clone_momentary_breakpoint (struct breakpoint *orig) { struct breakpoint *copy; /* If there's nothing to clone, then return nothing. */ if (orig == NULL) return NULL; copy = set_raw_breakpoint_without_location (orig->gdbarch, orig->type); copy->loc = allocate_bp_location (copy); set_breakpoint_location_function (copy->loc); copy->loc->gdbarch = orig->loc->gdbarch; copy->loc->requested_address = orig->loc->requested_address; copy->loc->address = orig->loc->address; copy->loc->section = orig->loc->section; copy->loc->pspace = orig->loc->pspace; if (orig->source_file == NULL) copy->source_file = NULL; else copy->source_file = xstrdup (orig->source_file); copy->line_number = orig->line_number; copy->frame_id = orig->frame_id; copy->thread = orig->thread; copy->pspace = orig->pspace; copy->enable_state = bp_enabled; copy->disposition = disp_donttouch; copy->number = internal_breakpoint_number--; update_global_location_list_nothrow (0); return copy; } struct breakpoint * set_momentary_breakpoint_at_pc (struct gdbarch *gdbarch, CORE_ADDR pc, enum bptype type) { struct symtab_and_line sal; sal = find_pc_line (pc, 0); sal.pc = pc; sal.section = find_pc_overlay (pc); sal.explicit_pc = 1; return set_momentary_breakpoint (gdbarch, sal, null_frame_id, type); } /* Tell the user we have just set a breakpoint B. */ static void mention (struct breakpoint *b) { int say_where = 0; struct cleanup *ui_out_chain; struct value_print_options opts; get_user_print_options (&opts); /* FIXME: This is misplaced; mention() is called by things (like hitting a watchpoint) other than breakpoint creation. It should be possible to clean this up and at the same time replace the random calls to breakpoint_changed with this hook. */ observer_notify_breakpoint_created (b->number); if (b->ops != NULL && b->ops->print_mention != NULL) b->ops->print_mention (b); else switch (b->type) { case bp_none: printf_filtered (_("(apparently deleted?) Eventpoint %d: "), b->number); break; case bp_watchpoint: ui_out_text (uiout, "Watchpoint "); ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "wpt"); ui_out_field_int (uiout, "number", b->number); ui_out_text (uiout, ": "); ui_out_field_string (uiout, "exp", b->exp_string); do_cleanups (ui_out_chain); break; case bp_hardware_watchpoint: ui_out_text (uiout, "Hardware watchpoint "); ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "wpt"); ui_out_field_int (uiout, "number", b->number); ui_out_text (uiout, ": "); ui_out_field_string (uiout, "exp", b->exp_string); do_cleanups (ui_out_chain); break; case bp_read_watchpoint: ui_out_text (uiout, "Hardware read watchpoint "); ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "hw-rwpt"); ui_out_field_int (uiout, "number", b->number); ui_out_text (uiout, ": "); ui_out_field_string (uiout, "exp", b->exp_string); do_cleanups (ui_out_chain); break; case bp_access_watchpoint: ui_out_text (uiout, "Hardware access (read/write) watchpoint "); ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "hw-awpt"); ui_out_field_int (uiout, "number", b->number); ui_out_text (uiout, ": "); ui_out_field_string (uiout, "exp", b->exp_string); do_cleanups (ui_out_chain); break; case bp_breakpoint: if (ui_out_is_mi_like_p (uiout)) { say_where = 0; break; } if (b->disposition == disp_del) printf_filtered (_("Temporary breakpoint")); else printf_filtered (_("Breakpoint")); printf_filtered (_(" %d"), b->number); say_where = 1; break; case bp_hardware_breakpoint: if (ui_out_is_mi_like_p (uiout)) { say_where = 0; break; } printf_filtered (_("Hardware assisted breakpoint %d"), b->number); say_where = 1; break; case bp_tracepoint: if (ui_out_is_mi_like_p (uiout)) { say_where = 0; break; } printf_filtered (_("Tracepoint")); printf_filtered (_(" %d"), b->number); say_where = 1; break; case bp_fast_tracepoint: if (ui_out_is_mi_like_p (uiout)) { say_where = 0; break; } printf_filtered (_("Fast tracepoint")); printf_filtered (_(" %d"), b->number); say_where = 1; break; case bp_until: case bp_finish: case bp_longjmp: case bp_longjmp_resume: case bp_step_resume: case bp_call_dummy: case bp_watchpoint_scope: case bp_shlib_event: case bp_thread_event: case bp_overlay_event: case bp_jit_event: case bp_longjmp_master: break; } if (say_where) { /* i18n: cagney/2005-02-11: Below needs to be merged into a single string. */ if (b->loc == NULL) { printf_filtered (_(" (%s) pending."), b->addr_string); } else { if (opts.addressprint || b->source_file == NULL) { printf_filtered (" at "); fputs_filtered (paddress (b->loc->gdbarch, b->loc->address), gdb_stdout); } if (b->source_file) printf_filtered (": file %s, line %d.", b->source_file, b->line_number); if (b->loc->next) { struct bp_location *loc = b->loc; int n = 0; for (; loc; loc = loc->next) ++n; printf_filtered (" (%d locations)", n); } } } if (ui_out_is_mi_like_p (uiout)) return; printf_filtered ("\n"); } static struct bp_location * add_location_to_breakpoint (struct breakpoint *b, const struct symtab_and_line *sal) { struct bp_location *loc, **tmp; loc = allocate_bp_location (b); for (tmp = &(b->loc); *tmp != NULL; tmp = &((*tmp)->next)) ; *tmp = loc; loc->gdbarch = get_sal_arch (*sal); if (!loc->gdbarch) loc->gdbarch = b->gdbarch; loc->requested_address = sal->pc; loc->address = adjust_breakpoint_address (loc->gdbarch, loc->requested_address, b->type); loc->pspace = sal->pspace; gdb_assert (loc->pspace != NULL); loc->section = sal->section; set_breakpoint_location_function (loc); return loc; } /* Return 1 if LOC is pointing to a permanent breakpoint, return 0 otherwise. */ static int bp_loc_is_permanent (struct bp_location *loc) { int len; CORE_ADDR addr; const gdb_byte *brk; gdb_byte *target_mem; struct cleanup *cleanup; int retval = 0; gdb_assert (loc != NULL); addr = loc->address; brk = gdbarch_breakpoint_from_pc (loc->gdbarch, &addr, &len); /* Software breakpoints unsupported? */ if (brk == NULL) return 0; target_mem = alloca (len); /* Enable the automatic memory restoration from breakpoints while we read the memory. Otherwise we could say about our temporary breakpoints they are permanent. */ cleanup = save_current_space_and_thread (); switch_to_program_space_and_thread (loc->pspace); make_show_memory_breakpoints_cleanup (0); if (target_read_memory (loc->address, target_mem, len) == 0 && memcmp (target_mem, brk, len) == 0) retval = 1; do_cleanups (cleanup); return retval; } /* Create a breakpoint with SAL as location. Use ADDR_STRING as textual description of the location, and COND_STRING as condition expression. */ static void create_breakpoint (struct gdbarch *gdbarch, struct symtabs_and_lines sals, char *addr_string, char *cond_string, enum bptype type, enum bpdisp disposition, int thread, int task, int ignore_count, struct breakpoint_ops *ops, int from_tty, int enabled) { struct breakpoint *b = NULL; int i; if (type == bp_hardware_breakpoint) { int i = hw_breakpoint_used_count (); int target_resources_ok = target_can_use_hardware_watchpoint (bp_hardware_breakpoint, i + 1, 0); if (target_resources_ok == 0) error (_("No hardware breakpoint support in the target.")); else if (target_resources_ok < 0) error (_("Hardware breakpoints used exceeds limit.")); } gdb_assert (sals.nelts > 0); for (i = 0; i < sals.nelts; ++i) { struct symtab_and_line sal = sals.sals[i]; struct bp_location *loc; if (from_tty) { struct gdbarch *loc_gdbarch = get_sal_arch (sal); if (!loc_gdbarch) loc_gdbarch = gdbarch; describe_other_breakpoints (loc_gdbarch, sal.pspace, sal.pc, sal.section, thread); } if (i == 0) { b = set_raw_breakpoint (gdbarch, sal, type); set_breakpoint_count (breakpoint_count + 1); b->number = breakpoint_count; b->thread = thread; b->task = task; b->cond_string = cond_string; b->ignore_count = ignore_count; b->enable_state = enabled ? bp_enabled : bp_disabled; b->disposition = disposition; b->pspace = sals.sals[0].pspace; if (enabled && b->pspace->executing_startup && (b->type == bp_breakpoint || b->type == bp_hardware_breakpoint)) b->enable_state = bp_startup_disabled; loc = b->loc; } else { loc = add_location_to_breakpoint (b, &sal); } if (bp_loc_is_permanent (loc)) make_breakpoint_permanent (b); if (b->cond_string) { char *arg = b->cond_string; loc->cond = parse_exp_1 (&arg, block_for_pc (loc->address), 0); if (*arg) error (_("Garbage %s follows condition"), arg); } } if (addr_string) b->addr_string = addr_string; else /* addr_string has to be used or breakpoint_re_set will delete me. */ b->addr_string = xstrprintf ("*%s", paddress (b->loc->gdbarch, b->loc->address)); b->ops = ops; mention (b); } /* Remove element at INDEX_TO_REMOVE from SAL, shifting other elements to fill the void space. */ static void remove_sal (struct symtabs_and_lines *sal, int index_to_remove) { int i = index_to_remove+1; int last_index = sal->nelts-1; for (;i <= last_index; ++i) sal->sals[i-1] = sal->sals[i]; --(sal->nelts); } /* If appropriate, obtains all sals that correspond to the same file and line as SAL, in all program spaces. Users debugging with IDEs, will want to set a breakpoint at foo.c:line, and not really care about program spaces. This is done only if SAL does not have explicit PC and has line and file information. If we got just a single expanded sal, return the original. Otherwise, if SAL.explicit_line is not set, filter out all sals for which the name of enclosing function is different from SAL. This makes sure that if we have breakpoint originally set in template instantiation, say foo<int>(), we won't expand SAL to locations at the same line in all existing instantiations of 'foo'. */ static struct symtabs_and_lines expand_line_sal_maybe (struct symtab_and_line sal) { struct symtabs_and_lines expanded; CORE_ADDR original_pc = sal.pc; char *original_function = NULL; int found; int i; struct cleanup *old_chain; /* If we have explicit pc, don't expand. If we have no line number, we can't expand. */ if (sal.explicit_pc || sal.line == 0 || sal.symtab == NULL) { expanded.nelts = 1; expanded.sals = xmalloc (sizeof (struct symtab_and_line)); expanded.sals[0] = sal; return expanded; } sal.pc = 0; old_chain = save_current_space_and_thread (); switch_to_program_space_and_thread (sal.pspace); find_pc_partial_function (original_pc, &original_function, NULL, NULL); /* Note that expand_line_sal visits *all* program spaces. */ expanded = expand_line_sal (sal); if (expanded.nelts == 1) { /* We had one sal, we got one sal. Return that sal, adjusting it past the function prologue if necessary. */ xfree (expanded.sals); expanded.nelts = 1; expanded.sals = xmalloc (sizeof (struct symtab_and_line)); sal.pc = original_pc; expanded.sals[0] = sal; skip_prologue_sal (&expanded.sals[0]); do_cleanups (old_chain); return expanded; } if (!sal.explicit_line) { CORE_ADDR func_addr, func_end; for (i = 0; i < expanded.nelts; ++i) { CORE_ADDR pc = expanded.sals[i].pc; char *this_function; /* We need to switch threads as well since we're about to read memory. */ switch_to_program_space_and_thread (expanded.sals[i].pspace); if (find_pc_partial_function (pc, &this_function, &func_addr, &func_end)) { if (this_function && strcmp (this_function, original_function) != 0) { remove_sal (&expanded, i); --i; } else if (func_addr == pc) { /* We're at beginning of a function, and should skip prologue. */ struct symbol *sym = find_pc_function (pc); if (sym) expanded.sals[i] = find_function_start_sal (sym, 1); else { /* Since find_pc_partial_function returned true, we should really always find the section here. */ struct obj_section *section = find_pc_section (pc); if (section) { struct gdbarch *gdbarch = get_objfile_arch (section->objfile); expanded.sals[i].pc = gdbarch_skip_prologue (gdbarch, pc); } } } } } } else { for (i = 0; i < expanded.nelts; ++i) { /* If this SAL corresponds to a breakpoint inserted using a line number, then skip the function prologue if necessary. */ skip_prologue_sal (&expanded.sals[i]); } } do_cleanups (old_chain); if (expanded.nelts <= 1) { /* This is un ugly workaround. If we get zero expanded sals then something is really wrong. Fix that by returnign the original sal. */ xfree (expanded.sals); expanded.nelts = 1; expanded.sals = xmalloc (sizeof (struct symtab_and_line)); sal.pc = original_pc; expanded.sals[0] = sal; return expanded; } if (original_pc) { found = 0; for (i = 0; i < expanded.nelts; ++i) if (expanded.sals[i].pc == original_pc) { found = 1; break; } gdb_assert (found); } return expanded; } /* Add SALS.nelts breakpoints to the breakpoint table. For each SALS.sal[i] breakpoint, include the corresponding ADDR_STRING[i] value. COND_STRING, if not NULL, specified the condition to be used for all breakpoints. Essentially the only case where SALS.nelts is not 1 is when we set a breakpoint on an overloaded function. In that case, it's still not possible to specify separate conditions for different overloaded functions, so we take just a single condition string. NOTE: If the function succeeds, the caller is expected to cleanup the arrays ADDR_STRING, COND_STRING, and SALS (but not the array contents). If the function fails (error() is called), the caller is expected to cleanups both the ADDR_STRING, COND_STRING, COND and SALS arrays and each of those arrays contents. */ static void create_breakpoints (struct gdbarch *gdbarch, struct symtabs_and_lines sals, char **addr_string, char *cond_string, enum bptype type, enum bpdisp disposition, int thread, int task, int ignore_count, struct breakpoint_ops *ops, int from_tty, int enabled) { int i; for (i = 0; i < sals.nelts; ++i) { struct symtabs_and_lines expanded = expand_line_sal_maybe (sals.sals[i]); create_breakpoint (gdbarch, expanded, addr_string[i], cond_string, type, disposition, thread, task, ignore_count, ops, from_tty, enabled); } } /* Parse ARG which is assumed to be a SAL specification possibly followed by conditionals. On return, SALS contains an array of SAL addresses found. ADDR_STRING contains a vector of (canonical) address strings. ARG points to the end of the SAL. */ static void parse_breakpoint_sals (char **address, struct symtabs_and_lines *sals, char ***addr_string, int *not_found_ptr) { char *addr_start = *address; *addr_string = NULL; /* If no arg given, or if first arg is 'if ', use the default breakpoint. */ if ((*address) == NULL || (strncmp ((*address), "if", 2) == 0 && isspace ((*address)[2]))) { if (default_breakpoint_valid) { struct symtab_and_line sal; init_sal (&sal); /* initialize to zeroes */ sals->sals = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line)); sal.pc = default_breakpoint_address; sal.line = default_breakpoint_line; sal.symtab = default_breakpoint_symtab; sal.pspace = default_breakpoint_pspace; sal.section = find_pc_overlay (sal.pc); /* "break" without arguments is equivalent to "break *PC" where PC is the default_breakpoint_address. So make sure to set sal.explicit_pc to prevent GDB from trying to expand the list of sals to include all other instances with the same symtab and line. */ sal.explicit_pc = 1; sals->sals[0] = sal; sals->nelts = 1; } else error (_("No default breakpoint address now.")); } else { /* Force almost all breakpoints to be in terms of the current_source_symtab (which is decode_line_1's default). This should produce the results we want almost all of the time while leaving default_breakpoint_* alone. ObjC: However, don't match an Objective-C method name which may have a '+' or '-' succeeded by a '[' */ struct symtab_and_line cursal = get_current_source_symtab_and_line (); if (default_breakpoint_valid && (!cursal.symtab || ((strchr ("+-", (*address)[0]) != NULL) && ((*address)[1] != '[')))) *sals = decode_line_1 (address, 1, default_breakpoint_symtab, default_breakpoint_line, addr_string, not_found_ptr); else *sals = decode_line_1 (address, 1, (struct symtab *) NULL, 0, addr_string, not_found_ptr); } /* For any SAL that didn't have a canonical string, fill one in. */ if (sals->nelts > 0 && *addr_string == NULL) *addr_string = xcalloc (sals->nelts, sizeof (char **)); if (addr_start != (*address)) { int i; for (i = 0; i < sals->nelts; i++) { /* Add the string if not present. */ if ((*addr_string)[i] == NULL) (*addr_string)[i] = savestring (addr_start, (*address) - addr_start); } } } /* Convert each SAL into a real PC. Verify that the PC can be inserted as a breakpoint. If it can't throw an error. */ static void breakpoint_sals_to_pc (struct symtabs_and_lines *sals, char *address) { int i; for (i = 0; i < sals->nelts; i++) resolve_sal_pc (&sals->sals[i]); } /* Fast tracepoints may have restrictions on valid locations. For instance, a fast tracepoint using a jump instead of a trap will likely have to overwrite more bytes than a trap would, and so can only be placed where the instruction is longer than the jump, or a multi-instruction sequence does not have a jump into the middle of it, etc. */ static void check_fast_tracepoint_sals (struct gdbarch *gdbarch, struct symtabs_and_lines *sals) { int i, rslt; struct symtab_and_line *sal; char *msg; struct cleanup *old_chain; for (i = 0; i < sals->nelts; i++) { sal = &sals->sals[i]; rslt = gdbarch_fast_tracepoint_valid_at (gdbarch, sal->pc, NULL, &msg); old_chain = make_cleanup (xfree, msg); if (!rslt) error (_("May not have a fast tracepoint at 0x%s%s"), paddress (gdbarch, sal->pc), (msg ? msg : "")); do_cleanups (old_chain); } } static void do_captured_parse_breakpoint (struct ui_out *ui, void *data) { struct captured_parse_breakpoint_args *args = data; parse_breakpoint_sals (args->arg_p, args->sals_p, args->addr_string_p, args->not_found_ptr); } /* Given TOK, a string specification of condition and thread, as accepted by the 'break' command, extract the condition string and thread number and set *COND_STRING and *THREAD. PC identifies the context at which the condition should be parsed. If no condition is found, *COND_STRING is set to NULL. If no thread is found, *THREAD is set to -1. */ static void find_condition_and_thread (char *tok, CORE_ADDR pc, char **cond_string, int *thread, int *task) { *cond_string = NULL; *thread = -1; while (tok && *tok) { char *end_tok; int toklen; char *cond_start = NULL; char *cond_end = NULL; while (*tok == ' ' || *tok == '\t') tok++; end_tok = tok; while (*end_tok != ' ' && *end_tok != '\t' && *end_tok != '\000') end_tok++; toklen = end_tok - tok; if (toklen >= 1 && strncmp (tok, "if", toklen) == 0) { struct expression *expr; tok = cond_start = end_tok + 1; expr = parse_exp_1 (&tok, block_for_pc (pc), 0); xfree (expr); cond_end = tok; *cond_string = savestring (cond_start, cond_end - cond_start); } else if (toklen >= 1 && strncmp (tok, "thread", toklen) == 0) { char *tmptok; tok = end_tok + 1; tmptok = tok; *thread = strtol (tok, &tok, 0); if (tok == tmptok) error (_("Junk after thread keyword.")); if (!valid_thread_id (*thread)) error (_("Unknown thread %d."), *thread); } else if (toklen >= 1 && strncmp (tok, "task", toklen) == 0) { char *tmptok; tok = end_tok + 1; tmptok = tok; *task = strtol (tok, &tok, 0); if (tok == tmptok) error (_("Junk after task keyword.")); if (!valid_task_id (*task)) error (_("Unknown task %d."), *task); } else error (_("Junk at end of arguments.")); } } /* Set a breakpoint. This function is shared between CLI and MI functions for setting a breakpoint. This function has two major modes of operations, selected by the PARSE_CONDITION_AND_THREAD parameter. If non-zero, the function will parse arg, extracting breakpoint location, address and thread. Otherwise, ARG is just the location of breakpoint, with condition and thread specified by the COND_STRING and THREAD parameters. Returns true if any breakpoint was created; false otherwise. */ static int break_command_really (struct gdbarch *gdbarch, char *arg, char *cond_string, int thread, int parse_condition_and_thread, int tempflag, int hardwareflag, int traceflag, int ignore_count, enum auto_boolean pending_break_support, struct breakpoint_ops *ops, int from_tty, int enabled) { struct gdb_exception e; struct symtabs_and_lines sals; struct symtab_and_line pending_sal; char *copy_arg; char *err_msg; char *addr_start = arg; char **addr_string; struct cleanup *old_chain; struct cleanup *bkpt_chain = NULL; struct captured_parse_breakpoint_args parse_args; int i; int pending = 0; int not_found = 0; enum bptype type_wanted; int task = 0; sals.sals = NULL; sals.nelts = 0; addr_string = NULL; parse_args.arg_p = &arg; parse_args.sals_p = &sals; parse_args.addr_string_p = &addr_string; parse_args.not_found_ptr = ¬_found; e = catch_exception (uiout, do_captured_parse_breakpoint, &parse_args, RETURN_MASK_ALL); /* If caller is interested in rc value from parse, set value. */ switch (e.reason) { case RETURN_QUIT: throw_exception (e); case RETURN_ERROR: switch (e.error) { case NOT_FOUND_ERROR: /* If pending breakpoint support is turned off, throw error. */ if (pending_break_support == AUTO_BOOLEAN_FALSE) throw_exception (e); exception_print (gdb_stderr, e); /* If pending breakpoint support is auto query and the user selects no, then simply return the error code. */ if (pending_break_support == AUTO_BOOLEAN_AUTO && !nquery ("Make breakpoint pending on future shared library load? ")) return 0; /* At this point, either the user was queried about setting a pending breakpoint and selected yes, or pending breakpoint behavior is on and thus a pending breakpoint is defaulted on behalf of the user. */ copy_arg = xstrdup (addr_start); addr_string = ©_arg; sals.nelts = 1; sals.sals = &pending_sal; pending_sal.pc = 0; pending = 1; break; default: throw_exception (e); } default: if (!sals.nelts) return 0; } /* Create a chain of things that always need to be cleaned up. */ old_chain = make_cleanup (null_cleanup, 0); if (!pending) { /* Make sure that all storage allocated to SALS gets freed. */ make_cleanup (xfree, sals.sals); /* Cleanup the addr_string array but not its contents. */ make_cleanup (xfree, addr_string); } /* ----------------------------- SNIP ----------------------------- Anything added to the cleanup chain beyond this point is assumed to be part of a breakpoint. If the breakpoint create succeeds then the memory is not reclaimed. */ bkpt_chain = make_cleanup (null_cleanup, 0); /* Mark the contents of the addr_string for cleanup. These go on the bkpt_chain and only occur if the breakpoint create fails. */ for (i = 0; i < sals.nelts; i++) { if (addr_string[i] != NULL) make_cleanup (xfree, addr_string[i]); } /* Resolve all line numbers to PC's and verify that the addresses are ok for the target. */ if (!pending) breakpoint_sals_to_pc (&sals, addr_start); type_wanted = (traceflag ? (hardwareflag ? bp_fast_tracepoint : bp_tracepoint) : (hardwareflag ? bp_hardware_breakpoint : bp_breakpoint)); /* Fast tracepoints may have additional restrictions on location. */ if (type_wanted == bp_fast_tracepoint) check_fast_tracepoint_sals (gdbarch, &sals); /* Verify that condition can be parsed, before setting any breakpoints. Allocate a separate condition expression for each breakpoint. */ if (!pending) { if (parse_condition_and_thread) { /* Here we only parse 'arg' to separate condition from thread number, so parsing in context of first sal is OK. When setting the breakpoint we'll re-parse it in context of each sal. */ cond_string = NULL; thread = -1; find_condition_and_thread (arg, sals.sals[0].pc, &cond_string, &thread, &task); if (cond_string) make_cleanup (xfree, cond_string); } else { /* Create a private copy of condition string. */ if (cond_string) { cond_string = xstrdup (cond_string); make_cleanup (xfree, cond_string); } } create_breakpoints (gdbarch, sals, addr_string, cond_string, type_wanted, tempflag ? disp_del : disp_donttouch, thread, task, ignore_count, ops, from_tty, enabled); } else { struct symtab_and_line sal = {0}; struct breakpoint *b; make_cleanup (xfree, copy_arg); b = set_raw_breakpoint_without_location (gdbarch, type_wanted); set_breakpoint_count (breakpoint_count + 1); b->number = breakpoint_count; b->thread = -1; b->addr_string = addr_string[0]; b->cond_string = NULL; b->ignore_count = ignore_count; b->disposition = tempflag ? disp_del : disp_donttouch; b->condition_not_parsed = 1; b->ops = ops; b->enable_state = enabled ? bp_enabled : bp_disabled; b->pspace = current_program_space; if (enabled && b->pspace->executing_startup && (b->type == bp_breakpoint || b->type == bp_hardware_breakpoint)) b->enable_state = bp_startup_disabled; mention (b); } if (sals.nelts > 1) warning (_("Multiple breakpoints were set.\n" "Use the \"delete\" command to delete unwanted breakpoints.")); /* That's it. Discard the cleanups for data inserted into the breakpoint. */ discard_cleanups (bkpt_chain); /* But cleanup everything else. */ do_cleanups (old_chain); /* error call may happen here - have BKPT_CHAIN already discarded. */ update_global_location_list (1); return 1; } /* Set a breakpoint. ARG is a string describing breakpoint address, condition, and thread. FLAG specifies if a breakpoint is hardware on, and if breakpoint is temporary, using BP_HARDWARE_FLAG and BP_TEMPFLAG. */ static void break_command_1 (char *arg, int flag, int from_tty) { int hardwareflag = flag & BP_HARDWAREFLAG; int tempflag = flag & BP_TEMPFLAG; break_command_really (get_current_arch (), arg, NULL, 0, 1 /* parse arg */, tempflag, hardwareflag, 0 /* traceflag */, 0 /* Ignore count */, pending_break_support, NULL /* breakpoint_ops */, from_tty, 1 /* enabled */); } void set_breakpoint (struct gdbarch *gdbarch, char *address, char *condition, int hardwareflag, int tempflag, int thread, int ignore_count, int pending, int enabled) { break_command_really (gdbarch, address, condition, thread, 0 /* condition and thread are valid. */, tempflag, hardwareflag, 0 /* traceflag */, ignore_count, pending ? AUTO_BOOLEAN_TRUE : AUTO_BOOLEAN_FALSE, NULL, 0, enabled); } /* Adjust SAL to the first instruction past the function prologue. The end of the prologue is determined using the line table from the debugging information. explicit_pc and explicit_line are not modified. If SAL is already past the prologue, then do nothing. */ static void skip_prologue_sal (struct symtab_and_line *sal) { struct symbol *sym; struct symtab_and_line start_sal; struct cleanup *old_chain; old_chain = save_current_space_and_thread (); sym = find_pc_function (sal->pc); if (sym != NULL) { start_sal = find_function_start_sal (sym, 1); if (sal->pc < start_sal.pc) { start_sal.explicit_line = sal->explicit_line; start_sal.explicit_pc = sal->explicit_pc; *sal = start_sal; } } do_cleanups (old_chain); } /* Helper function for break_command_1 and disassemble_command. */ void resolve_sal_pc (struct symtab_and_line *sal) { CORE_ADDR pc; if (sal->pc == 0 && sal->symtab != NULL) { if (!find_line_pc (sal->symtab, sal->line, &pc)) error (_("No line %d in file \"%s\"."), sal->line, sal->symtab->filename); sal->pc = pc; /* If this SAL corresponds to a breakpoint inserted using a line number, then skip the function prologue if necessary. */ if (sal->explicit_line) { /* Preserve the original line number. */ int saved_line = sal->line; skip_prologue_sal (sal); sal->line = saved_line; } } if (sal->section == 0 && sal->symtab != NULL) { struct blockvector *bv; struct block *b; struct symbol *sym; bv = blockvector_for_pc_sect (sal->pc, 0, &b, sal->symtab); if (bv != NULL) { sym = block_linkage_function (b); if (sym != NULL) { fixup_symbol_section (sym, sal->symtab->objfile); sal->section = SYMBOL_OBJ_SECTION (sym); } else { /* It really is worthwhile to have the section, so we'll just have to look harder. This case can be executed if we have line numbers but no functions (as can happen in assembly source). */ struct minimal_symbol *msym; struct cleanup *old_chain = save_current_space_and_thread (); switch_to_program_space_and_thread (sal->pspace); msym = lookup_minimal_symbol_by_pc (sal->pc); if (msym) sal->section = SYMBOL_OBJ_SECTION (msym); do_cleanups (old_chain); } } } } void break_command (char *arg, int from_tty) { break_command_1 (arg, 0, from_tty); } void tbreak_command (char *arg, int from_tty) { break_command_1 (arg, BP_TEMPFLAG, from_tty); } static void hbreak_command (char *arg, int from_tty) { break_command_1 (arg, BP_HARDWAREFLAG, from_tty); } static void thbreak_command (char *arg, int from_tty) { break_command_1 (arg, (BP_TEMPFLAG | BP_HARDWAREFLAG), from_tty); } static void stop_command (char *arg, int from_tty) { printf_filtered (_("Specify the type of breakpoint to set.\n\ Usage: stop in <function | address>\n\ stop at <line>\n")); } static void stopin_command (char *arg, int from_tty) { int badInput = 0; if (arg == (char *) NULL) badInput = 1; else if (*arg != '*') { char *argptr = arg; int hasColon = 0; /* look for a ':'. If this is a line number specification, then say it is bad, otherwise, it should be an address or function/method name */ while (*argptr && !hasColon) { hasColon = (*argptr == ':'); argptr++; } if (hasColon) badInput = (*argptr != ':'); /* Not a class::method */ else badInput = isdigit (*arg); /* a simple line number */ } if (badInput) printf_filtered (_("Usage: stop in <function | address>\n")); else break_command_1 (arg, 0, from_tty); } static void stopat_command (char *arg, int from_tty) { int badInput = 0; if (arg == (char *) NULL || *arg == '*') /* no line number */ badInput = 1; else { char *argptr = arg; int hasColon = 0; /* look for a ':'. If there is a '::' then get out, otherwise it is probably a line number. */ while (*argptr && !hasColon) { hasColon = (*argptr == ':'); argptr++; } if (hasColon) badInput = (*argptr == ':'); /* we have class::method */ else badInput = !isdigit (*arg); /* not a line number */ } if (badInput) printf_filtered (_("Usage: stop at <line>\n")); else break_command_1 (arg, 0, from_tty); } /* accessflag: hw_write: watch write, hw_read: watch read, hw_access: watch access (read or write) */ static void watch_command_1 (char *arg, int accessflag, int from_tty) { struct gdbarch *gdbarch = get_current_arch (); struct breakpoint *b, *scope_breakpoint = NULL; struct expression *exp; struct block *exp_valid_block; struct value *val, *mark; struct frame_info *frame; char *exp_start = NULL; char *exp_end = NULL; char *tok, *id_tok_start, *end_tok; int toklen; char *cond_start = NULL; char *cond_end = NULL; int i, other_type_used, target_resources_ok = 0; enum bptype bp_type; int mem_cnt = 0; int thread = -1; /* Make sure that we actually have parameters to parse. */ if (arg != NULL && arg[0] != '\0') { toklen = strlen (arg); /* Size of argument list. */ /* Points tok to the end of the argument list. */ tok = arg + toklen - 1; /* Go backwards in the parameters list. Skip the last parameter. If we're expecting a 'thread <thread_num>' parameter, this should be the thread identifier. */ while (tok > arg && (*tok == ' ' || *tok == '\t')) tok--; while (tok > arg && (*tok != ' ' && *tok != '\t')) tok--; /* Points end_tok to the beginning of the last token. */ id_tok_start = tok + 1; /* Go backwards in the parameters list. Skip one more parameter. If we're expecting a 'thread <thread_num>' parameter, we should reach a "thread" token. */ while (tok > arg && (*tok == ' ' || *tok == '\t')) tok--; end_tok = tok; while (tok > arg && (*tok != ' ' && *tok != '\t')) tok--; /* Move the pointer forward to skip the whitespace and calculate the length of the token. */ tok++; toklen = end_tok - tok; if (toklen >= 1 && strncmp (tok, "thread", toklen) == 0) { /* At this point we've found a "thread" token, which means the user is trying to set a watchpoint that triggers only in a specific thread. */ char *endp; /* Extract the thread ID from the next token. */ thread = strtol (id_tok_start, &endp, 0); /* Check if the user provided a valid numeric value for the thread ID. */ if (*endp != ' ' && *endp != '\t' && *endp != '\0') error (_("Invalid thread ID specification %s."), id_tok_start); /* Check if the thread actually exists. */ if (!valid_thread_id (thread)) error (_("Unknown thread %d."), thread); /* Truncate the string and get rid of the thread <thread_num> parameter before the parameter list is parsed by the evaluate_expression() function. */ *tok = '\0'; } } /* Parse the rest of the arguments. */ innermost_block = NULL; exp_start = arg; exp = parse_exp_1 (&arg, 0, 0); exp_end = arg; /* Remove trailing whitespace from the expression before saving it. This makes the eventual display of the expression string a bit prettier. */ while (exp_end > exp_start && (exp_end[-1] == ' ' || exp_end[-1] == '\t')) --exp_end; exp_valid_block = innermost_block; mark = value_mark (); fetch_watchpoint_value (exp, &val, NULL, NULL); if (val != NULL) release_value (val); tok = arg; while (*tok == ' ' || *tok == '\t') tok++; end_tok = tok; while (*end_tok != ' ' && *end_tok != '\t' && *end_tok != '\000') end_tok++; toklen = end_tok - tok; if (toklen >= 1 && strncmp (tok, "if", toklen) == 0) { struct expression *cond; tok = cond_start = end_tok + 1; cond = parse_exp_1 (&tok, 0, 0); xfree (cond); cond_end = tok; } if (*tok) error (_("Junk at end of command.")); if (accessflag == hw_read) bp_type = bp_read_watchpoint; else if (accessflag == hw_access) bp_type = bp_access_watchpoint; else bp_type = bp_hardware_watchpoint; mem_cnt = can_use_hardware_watchpoint (val); if (mem_cnt == 0 && bp_type != bp_hardware_watchpoint) error (_("Expression cannot be implemented with read/access watchpoint.")); if (mem_cnt != 0) { i = hw_watchpoint_used_count (bp_type, &other_type_used); target_resources_ok = target_can_use_hardware_watchpoint (bp_type, i + mem_cnt, other_type_used); if (target_resources_ok == 0 && bp_type != bp_hardware_watchpoint) error (_("Target does not support this type of hardware watchpoint.")); if (target_resources_ok < 0 && bp_type != bp_hardware_watchpoint) error (_("Target can only support one kind of HW watchpoint at a time.")); } /* Change the type of breakpoint to an ordinary watchpoint if a hardware watchpoint could not be set. */ if (!mem_cnt || target_resources_ok <= 0) bp_type = bp_watchpoint; frame = block_innermost_frame (exp_valid_block); /* If the expression is "local", then set up a "watchpoint scope" breakpoint at the point where we've left the scope of the watchpoint expression. Create the scope breakpoint before the watchpoint, so that we will encounter it first in bpstat_stop_status. */ if (innermost_block && frame) { if (frame_id_p (frame_unwind_caller_id (frame))) { scope_breakpoint = create_internal_breakpoint (frame_unwind_caller_arch (frame), frame_unwind_caller_pc (frame), bp_watchpoint_scope); scope_breakpoint->enable_state = bp_enabled; /* Automatically delete the breakpoint when it hits. */ scope_breakpoint->disposition = disp_del; /* Only break in the proper frame (help with recursion). */ scope_breakpoint->frame_id = frame_unwind_caller_id (frame); /* Set the address at which we will stop. */ scope_breakpoint->loc->gdbarch = frame_unwind_caller_arch (frame); scope_breakpoint->loc->requested_address = frame_unwind_caller_pc (frame); scope_breakpoint->loc->address = adjust_breakpoint_address (scope_breakpoint->loc->gdbarch, scope_breakpoint->loc->requested_address, scope_breakpoint->type); } } /* Now set up the breakpoint. */ b = set_raw_breakpoint_without_location (NULL, bp_type); set_breakpoint_count (breakpoint_count + 1); b->number = breakpoint_count; b->thread = thread; b->disposition = disp_donttouch; b->exp = exp; b->exp_valid_block = exp_valid_block; b->exp_string = savestring (exp_start, exp_end - exp_start); b->val = val; b->val_valid = 1; if (cond_start) b->cond_string = savestring (cond_start, cond_end - cond_start); else b->cond_string = 0; if (frame) { b->watchpoint_frame = get_frame_id (frame); b->watchpoint_thread = inferior_ptid; } else { b->watchpoint_frame = null_frame_id; b->watchpoint_thread = null_ptid; } if (scope_breakpoint != NULL) { /* The scope breakpoint is related to the watchpoint. We will need to act on them together. */ b->related_breakpoint = scope_breakpoint; scope_breakpoint->related_breakpoint = b; } value_free_to_mark (mark); /* Finally update the new watchpoint. This creates the locations that should be inserted. */ update_watchpoint (b, 1); mention (b); update_global_location_list (1); } /* Return count of locations need to be watched and can be handled in hardware. If the watchpoint can not be handled in hardware return zero. */ static int can_use_hardware_watchpoint (struct value *v) { int found_memory_cnt = 0; struct value *head = v; /* Did the user specifically forbid us to use hardware watchpoints? */ if (!can_use_hw_watchpoints) return 0; /* Make sure that the value of the expression depends only upon memory contents, and values computed from them within GDB. If we find any register references or function calls, we can't use a hardware watchpoint. The idea here is that evaluating an expression generates a series of values, one holding the value of every subexpression. (The expression a*b+c has five subexpressions: a, b, a*b, c, and a*b+c.) GDB's values hold almost enough information to establish the criteria given above --- they identify memory lvalues, register lvalues, computed values, etcetera. So we can evaluate the expression, and then scan the chain of values that leaves behind to decide whether we can detect any possible change to the expression's final value using only hardware watchpoints. However, I don't think that the values returned by inferior function calls are special in any way. So this function may not notice that an expression involving an inferior function call can't be watched with hardware watchpoints. FIXME. */ for (; v; v = value_next (v)) { if (VALUE_LVAL (v) == lval_memory) { if (value_lazy (v)) /* A lazy memory lvalue is one that GDB never needed to fetch; we either just used its address (e.g., `a' in `a.b') or we never needed it at all (e.g., `a' in `a,b'). */ ; else { /* Ahh, memory we actually used! Check if we can cover it with hardware watchpoints. */ struct type *vtype = check_typedef (value_type (v)); /* We only watch structs and arrays if user asked for it explicitly, never if they just happen to appear in a middle of some value chain. */ if (v == head || (TYPE_CODE (vtype) != TYPE_CODE_STRUCT && TYPE_CODE (vtype) != TYPE_CODE_ARRAY)) { CORE_ADDR vaddr = value_address (v); int len = TYPE_LENGTH (value_type (v)); if (!target_region_ok_for_hw_watchpoint (vaddr, len)) return 0; else found_memory_cnt++; } } } else if (VALUE_LVAL (v) != not_lval && deprecated_value_modifiable (v) == 0) return 0; /* ??? What does this represent? */ else if (VALUE_LVAL (v) == lval_register) return 0; /* cannot watch a register with a HW watchpoint */ } /* The expression itself looks suitable for using a hardware watchpoint, but give the target machine a chance to reject it. */ return found_memory_cnt; } void watch_command_wrapper (char *arg, int from_tty) { watch_command (arg, from_tty); } static void watch_command (char *arg, int from_tty) { watch_command_1 (arg, hw_write, from_tty); } void rwatch_command_wrapper (char *arg, int from_tty) { rwatch_command (arg, from_tty); } static void rwatch_command (char *arg, int from_tty) { watch_command_1 (arg, hw_read, from_tty); } void awatch_command_wrapper (char *arg, int from_tty) { awatch_command (arg, from_tty); } static void awatch_command (char *arg, int from_tty) { watch_command_1 (arg, hw_access, from_tty); } /* Helper routines for the until_command routine in infcmd.c. Here because it uses the mechanisms of breakpoints. */ struct until_break_command_continuation_args { struct breakpoint *breakpoint; struct breakpoint *breakpoint2; }; /* This function is called by fetch_inferior_event via the cmd_continuation pointer, to complete the until command. It takes care of cleaning up the temporary breakpoints set up by the until command. */ static void until_break_command_continuation (void *arg) { struct until_break_command_continuation_args *a = arg; delete_breakpoint (a->breakpoint); if (a->breakpoint2) delete_breakpoint (a->breakpoint2); } void until_break_command (char *arg, int from_tty, int anywhere) { struct symtabs_and_lines sals; struct symtab_and_line sal; struct frame_info *frame = get_selected_frame (NULL); struct breakpoint *breakpoint; struct breakpoint *breakpoint2 = NULL; struct cleanup *old_chain; clear_proceed_status (); /* Set a breakpoint where the user wants it and at return from this function */ if (default_breakpoint_valid) sals = decode_line_1 (&arg, 1, default_breakpoint_symtab, default_breakpoint_line, (char ***) NULL, NULL); else sals = decode_line_1 (&arg, 1, (struct symtab *) NULL, 0, (char ***) NULL, NULL); if (sals.nelts != 1) error (_("Couldn't get information on specified line.")); sal = sals.sals[0]; xfree (sals.sals); /* malloc'd, so freed */ if (*arg) error (_("Junk at end of arguments.")); resolve_sal_pc (&sal); if (anywhere) /* If the user told us to continue until a specified location, we don't specify a frame at which we need to stop. */ breakpoint = set_momentary_breakpoint (get_frame_arch (frame), sal, null_frame_id, bp_until); else /* Otherwise, specify the selected frame, because we want to stop only at the very same frame. */ breakpoint = set_momentary_breakpoint (get_frame_arch (frame), sal, get_stack_frame_id (frame), bp_until); old_chain = make_cleanup_delete_breakpoint (breakpoint); /* Keep within the current frame, or in frames called by the current one. */ if (frame_id_p (frame_unwind_caller_id (frame))) { sal = find_pc_line (frame_unwind_caller_pc (frame), 0); sal.pc = frame_unwind_caller_pc (frame); breakpoint2 = set_momentary_breakpoint (frame_unwind_caller_arch (frame), sal, frame_unwind_caller_id (frame), bp_until); make_cleanup_delete_breakpoint (breakpoint2); } proceed (-1, TARGET_SIGNAL_DEFAULT, 0); /* If we are running asynchronously, and proceed call above has actually managed to start the target, arrange for breakpoints to be deleted when the target stops. Otherwise, we're already stopped and delete breakpoints via cleanup chain. */ if (target_can_async_p () && is_running (inferior_ptid)) { struct until_break_command_continuation_args *args; args = xmalloc (sizeof (*args)); args->breakpoint = breakpoint; args->breakpoint2 = breakpoint2; discard_cleanups (old_chain); add_continuation (inferior_thread (), until_break_command_continuation, args, xfree); } else do_cleanups (old_chain); } static void ep_skip_leading_whitespace (char **s) { if ((s == NULL) || (*s == NULL)) return; while (isspace (**s)) *s += 1; } /* This function attempts to parse an optional "if <cond>" clause from the arg string. If one is not found, it returns NULL. Else, it returns a pointer to the condition string. (It does not attempt to evaluate the string against a particular block.) And, it updates arg to point to the first character following the parsed if clause in the arg string. */ static char * ep_parse_optional_if_clause (char **arg) { char *cond_string; if (((*arg)[0] != 'i') || ((*arg)[1] != 'f') || !isspace ((*arg)[2])) return NULL; /* Skip the "if" keyword. */ (*arg) += 2; /* Skip any extra leading whitespace, and record the start of the condition string. */ ep_skip_leading_whitespace (arg); cond_string = *arg; /* Assume that the condition occupies the remainder of the arg string. */ (*arg) += strlen (cond_string); return cond_string; } /* Commands to deal with catching events, such as signals, exceptions, process start/exit, etc. */ typedef enum { catch_fork_temporary, catch_vfork_temporary, catch_fork_permanent, catch_vfork_permanent } catch_fork_kind; static void catch_fork_command_1 (char *arg, int from_tty, struct cmd_list_element *command) { struct gdbarch *gdbarch = get_current_arch (); char *cond_string = NULL; catch_fork_kind fork_kind; int tempflag; fork_kind = (catch_fork_kind) (uintptr_t) get_cmd_context (command); tempflag = (fork_kind == catch_fork_temporary || fork_kind == catch_vfork_temporary); if (!arg) arg = ""; ep_skip_leading_whitespace (&arg); /* The allowed syntax is: catch [v]fork catch [v]fork if <cond> First, check if there's an if clause. */ cond_string = ep_parse_optional_if_clause (&arg); if ((*arg != '\0') && !isspace (*arg)) error (_("Junk at end of arguments.")); /* If this target supports it, create a fork or vfork catchpoint and enable reporting of such events. */ switch (fork_kind) { case catch_fork_temporary: case catch_fork_permanent: create_fork_vfork_event_catchpoint (gdbarch, tempflag, cond_string, &catch_fork_breakpoint_ops); break; case catch_vfork_temporary: case catch_vfork_permanent: create_fork_vfork_event_catchpoint (gdbarch, tempflag, cond_string, &catch_vfork_breakpoint_ops); break; default: error (_("unsupported or unknown fork kind; cannot catch it")); break; } } static void catch_exec_command_1 (char *arg, int from_tty, struct cmd_list_element *command) { struct gdbarch *gdbarch = get_current_arch (); int tempflag; char *cond_string = NULL; tempflag = get_cmd_context (command) == CATCH_TEMPORARY; if (!arg) arg = ""; ep_skip_leading_whitespace (&arg); /* The allowed syntax is: catch exec catch exec if <cond> First, check if there's an if clause. */ cond_string = ep_parse_optional_if_clause (&arg); if ((*arg != '\0') && !isspace (*arg)) error (_("Junk at end of arguments.")); /* If this target supports it, create an exec catchpoint and enable reporting of such events. */ create_catchpoint (gdbarch, tempflag, cond_string, &catch_exec_breakpoint_ops); } static enum print_stop_action print_exception_catchpoint (struct breakpoint *b) { int bp_temp, bp_throw; annotate_catchpoint (b->number); bp_throw = strstr (b->addr_string, "throw") != NULL; if (b->loc->address != b->loc->requested_address) breakpoint_adjustment_warning (b->loc->requested_address, b->loc->address, b->number, 1); bp_temp = b->disposition == disp_del; ui_out_text (uiout, bp_temp ? "Temporary catchpoint " : "Catchpoint "); if (!ui_out_is_mi_like_p (uiout)) ui_out_field_int (uiout, "bkptno", b->number); ui_out_text (uiout, bp_throw ? " (exception thrown), " : " (exception caught), "); if (ui_out_is_mi_like_p (uiout)) { ui_out_field_string (uiout, "reason", async_reason_lookup (EXEC_ASYNC_BREAKPOINT_HIT)); ui_out_field_string (uiout, "disp", bpdisp_text (b->disposition)); ui_out_field_int (uiout, "bkptno", b->number); } return PRINT_SRC_AND_LOC; } static void print_one_exception_catchpoint (struct breakpoint *b, struct bp_location **last_loc) { struct value_print_options opts; get_user_print_options (&opts); if (opts.addressprint) { annotate_field (4); if (b->loc == NULL || b->loc->shlib_disabled) ui_out_field_string (uiout, "addr", "<PENDING>"); else ui_out_field_core_addr (uiout, "addr", b->loc->gdbarch, b->loc->address); } annotate_field (5); if (b->loc) *last_loc = b->loc; if (strstr (b->addr_string, "throw") != NULL) ui_out_field_string (uiout, "what", "exception throw"); else ui_out_field_string (uiout, "what", "exception catch"); } static void print_mention_exception_catchpoint (struct breakpoint *b) { int bp_temp; int bp_throw; bp_temp = b->disposition == disp_del; bp_throw = strstr (b->addr_string, "throw") != NULL; ui_out_text (uiout, bp_temp ? _("Temporary catchpoint ") : _("Catchpoint ")); ui_out_field_int (uiout, "bkptno", b->number); ui_out_text (uiout, bp_throw ? _(" (throw)") : _(" (catch)")); } static struct breakpoint_ops gnu_v3_exception_catchpoint_ops = { NULL, /* insert */ NULL, /* remove */ NULL, /* breakpoint_hit */ print_exception_catchpoint, print_one_exception_catchpoint, print_mention_exception_catchpoint }; static int handle_gnu_v3_exceptions (int tempflag, char *cond_string, enum exception_event_kind ex_event, int from_tty) { char *trigger_func_name; if (ex_event == EX_EVENT_CATCH) trigger_func_name = "__cxa_begin_catch"; else trigger_func_name = "__cxa_throw"; break_command_really (get_current_arch (), trigger_func_name, cond_string, -1, 0 /* condition and thread are valid. */, tempflag, 0, 0, 0, AUTO_BOOLEAN_TRUE /* pending */, &gnu_v3_exception_catchpoint_ops, from_tty, 1 /* enabled */); return 1; } /* Deal with "catch catch" and "catch throw" commands */ static void catch_exception_command_1 (enum exception_event_kind ex_event, char *arg, int tempflag, int from_tty) { char *cond_string = NULL; struct symtab_and_line *sal = NULL; if (!arg) arg = ""; ep_skip_leading_whitespace (&arg); cond_string = ep_parse_optional_if_clause (&arg); if ((*arg != '\0') && !isspace (*arg)) error (_("Junk at end of arguments.")); if (ex_event != EX_EVENT_THROW && ex_event != EX_EVENT_CATCH) error (_("Unsupported or unknown exception event; cannot catch it")); if (handle_gnu_v3_exceptions (tempflag, cond_string, ex_event, from_tty)) return; warning (_("Unsupported with this platform/compiler combination.")); } /* Implementation of "catch catch" command. */ static void catch_catch_command (char *arg, int from_tty, struct cmd_list_element *command) { int tempflag = get_cmd_context (command) == CATCH_TEMPORARY; catch_exception_command_1 (EX_EVENT_CATCH, arg, tempflag, from_tty); } /* Implementation of "catch throw" command. */ static void catch_throw_command (char *arg, int from_tty, struct cmd_list_element *command) { int tempflag = get_cmd_context (command) == CATCH_TEMPORARY; catch_exception_command_1 (EX_EVENT_THROW, arg, tempflag, from_tty); } /* Create a breakpoint struct for Ada exception catchpoints. */ static void create_ada_exception_breakpoint (struct gdbarch *gdbarch, struct symtab_and_line sal, char *addr_string, char *exp_string, char *cond_string, struct expression *cond, struct breakpoint_ops *ops, int tempflag, int from_tty) { struct breakpoint *b; if (from_tty) { struct gdbarch *loc_gdbarch = get_sal_arch (sal); if (!loc_gdbarch) loc_gdbarch = gdbarch; describe_other_breakpoints (loc_gdbarch, sal.pspace, sal.pc, sal.section, -1); /* FIXME: brobecker/2006-12-28: Actually, re-implement a special version for exception catchpoints, because two catchpoints used for different exception names will use the same address. In this case, a "breakpoint ... also set at..." warning is unproductive. Besides. the warning phrasing is also a bit inapropriate, we should use the word catchpoint, and tell the user what type of catchpoint it is. The above is good enough for now, though. */ } b = set_raw_breakpoint (gdbarch, sal, bp_breakpoint); set_breakpoint_count (breakpoint_count + 1); b->enable_state = bp_enabled; b->disposition = tempflag ? disp_del : disp_donttouch; b->number = breakpoint_count; b->ignore_count = 0; b->loc->cond = cond; b->addr_string = addr_string; b->language = language_ada; b->cond_string = cond_string; b->exp_string = exp_string; b->thread = -1; b->ops = ops; mention (b); update_global_location_list (1); } /* Implement the "catch exception" command. */ static void catch_ada_exception_command (char *arg, int from_tty, struct cmd_list_element *command) { struct gdbarch *gdbarch = get_current_arch (); int tempflag; struct symtab_and_line sal; enum bptype type; char *addr_string = NULL; char *exp_string = NULL; char *cond_string = NULL; struct expression *cond = NULL; struct breakpoint_ops *ops = NULL; tempflag = get_cmd_context (command) == CATCH_TEMPORARY; if (!arg) arg = ""; sal = ada_decode_exception_location (arg, &addr_string, &exp_string, &cond_string, &cond, &ops); create_ada_exception_breakpoint (gdbarch, sal, addr_string, exp_string, cond_string, cond, ops, tempflag, from_tty); } /* Cleanup function for a syscall filter list. */ static void clean_up_filters (void *arg) { VEC(int) *iter = *(VEC(int) **) arg; VEC_free (int, iter); } /* Splits the argument using space as delimiter. Returns an xmalloc'd filter list, or NULL if no filtering is required. */ static VEC(int) * catch_syscall_split_args (char *arg) { VEC(int) *result = NULL; struct cleanup *cleanup = make_cleanup (clean_up_filters, &result); while (*arg != '\0') { int i, syscall_number; char *endptr; char cur_name[128]; struct syscall s; /* Skip whitespace. */ while (isspace (*arg)) arg++; for (i = 0; i < 127 && arg[i] && !isspace (arg[i]); ++i) cur_name[i] = arg[i]; cur_name[i] = '\0'; arg += i; /* Check if the user provided a syscall name or a number. */ syscall_number = (int) strtol (cur_name, &endptr, 0); if (*endptr == '\0') get_syscall_by_number (syscall_number, &s); else { /* We have a name. Let's check if it's valid and convert it to a number. */ get_syscall_by_name (cur_name, &s); if (s.number == UNKNOWN_SYSCALL) /* Here we have to issue an error instead of a warning, because GDB cannot do anything useful if there's no syscall number to be caught. */ error (_("Unknown syscall name '%s'."), cur_name); } /* Ok, it's valid. */ VEC_safe_push (int, result, s.number); } discard_cleanups (cleanup); return result; } /* Implement the "catch syscall" command. */ static void catch_syscall_command_1 (char *arg, int from_tty, struct cmd_list_element *command) { int tempflag; VEC(int) *filter; struct syscall s; struct gdbarch *gdbarch = get_current_arch (); /* Checking if the feature if supported. */ if (gdbarch_get_syscall_number_p (gdbarch) == 0) error (_("The feature 'catch syscall' is not supported on \ this architeture yet.")); tempflag = get_cmd_context (command) == CATCH_TEMPORARY; ep_skip_leading_whitespace (&arg); /* We need to do this first "dummy" translation in order to get the syscall XML file loaded or, most important, to display a warning to the user if there's no XML file for his/her architecture. */ get_syscall_by_number (0, &s); /* The allowed syntax is: catch syscall catch syscall <name | number> [<name | number> ... <name | number>] Let's check if there's a syscall name. */ if (arg != NULL) filter = catch_syscall_split_args (arg); else filter = NULL; create_syscall_event_catchpoint (tempflag, filter, &catch_syscall_breakpoint_ops); } /* Implement the "catch assert" command. */ static void catch_assert_command (char *arg, int from_tty, struct cmd_list_element *command) { struct gdbarch *gdbarch = get_current_arch (); int tempflag; struct symtab_and_line sal; char *addr_string = NULL; struct breakpoint_ops *ops = NULL; tempflag = get_cmd_context (command) == CATCH_TEMPORARY; if (!arg) arg = ""; sal = ada_decode_assert_location (arg, &addr_string, &ops); create_ada_exception_breakpoint (gdbarch, sal, addr_string, NULL, NULL, NULL, ops, tempflag, from_tty); } static void catch_command (char *arg, int from_tty) { error (_("Catch requires an event name.")); } static void tcatch_command (char *arg, int from_tty) { error (_("Catch requires an event name.")); } /* Delete breakpoints by address or line. */ static void clear_command (char *arg, int from_tty) { struct breakpoint *b; VEC(breakpoint_p) *found = 0; int ix; int default_match; struct symtabs_and_lines sals; struct symtab_and_line sal; int i; if (arg) { sals = decode_line_spec (arg, 1); default_match = 0; } else { sals.sals = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line)); make_cleanup (xfree, sals.sals); init_sal (&sal); /* initialize to zeroes */ sal.line = default_breakpoint_line; sal.symtab = default_breakpoint_symtab; sal.pc = default_breakpoint_address; sal.pspace = default_breakpoint_pspace; if (sal.symtab == 0) error (_("No source file specified.")); sals.sals[0] = sal; sals.nelts = 1; default_match = 1; } /* We don't call resolve_sal_pc here. That's not as bad as it seems, because all existing breakpoints typically have both file/line and pc set. So, if clear is given file/line, we can match this to existing breakpoint without obtaining pc at all. We only support clearing given the address explicitly present in breakpoint table. Say, we've set breakpoint at file:line. There were several PC values for that file:line, due to optimization, all in one block. We've picked one PC value. If "clear" is issued with another PC corresponding to the same file:line, the breakpoint won't be cleared. We probably can still clear the breakpoint, but since the other PC value is never presented to user, user can only find it by guessing, and it does not seem important to support that. */ /* For each line spec given, delete bps which correspond to it. Do it in two passes, solely to preserve the current behavior that from_tty is forced true if we delete more than one breakpoint. */ found = NULL; for (i = 0; i < sals.nelts; i++) { /* If exact pc given, clear bpts at that pc. If line given (pc == 0), clear all bpts on specified line. If defaulting, clear all bpts on default line or at default pc. defaulting sal.pc != 0 tests to do 0 1 pc 1 1 pc _and_ line 0 0 line 1 0 <can't happen> */ sal = sals.sals[i]; /* Find all matching breakpoints and add them to 'found'. */ ALL_BREAKPOINTS (b) { int match = 0; /* Are we going to delete b? */ if (b->type != bp_none && b->type != bp_watchpoint && b->type != bp_hardware_watchpoint && b->type != bp_read_watchpoint && b->type != bp_access_watchpoint) { struct bp_location *loc = b->loc; for (; loc; loc = loc->next) { int pc_match = sal.pc && (loc->pspace == sal.pspace) && (loc->address == sal.pc) && (!section_is_overlay (loc->section) || loc->section == sal.section); int line_match = ((default_match || (0 == sal.pc)) && b->source_file != NULL && sal.symtab != NULL && sal.pspace == loc->pspace && strcmp (b->source_file, sal.symtab->filename) == 0 && b->line_number == sal.line); if (pc_match || line_match) { match = 1; break; } } } if (match) VEC_safe_push(breakpoint_p, found, b); } } /* Now go thru the 'found' chain and delete them. */ if (VEC_empty(breakpoint_p, found)) { if (arg) error (_("No breakpoint at %s."), arg); else error (_("No breakpoint at this line.")); } if (VEC_length(breakpoint_p, found) > 1) from_tty = 1; /* Always report if deleted more than one */ if (from_tty) { if (VEC_length(breakpoint_p, found) == 1) printf_unfiltered (_("Deleted breakpoint ")); else printf_unfiltered (_("Deleted breakpoints ")); } breakpoints_changed (); for (ix = 0; VEC_iterate(breakpoint_p, found, ix, b); ix++) { if (from_tty) printf_unfiltered ("%d ", b->number); delete_breakpoint (b); } if (from_tty) putchar_unfiltered ('\n'); } /* Delete breakpoint in BS if they are `delete' breakpoints and all breakpoints that are marked for deletion, whether hit or not. This is called after any breakpoint is hit, or after errors. */ void breakpoint_auto_delete (bpstat bs) { struct breakpoint *b, *temp; for (; bs; bs = bs->next) if (bs->breakpoint_at && bs->breakpoint_at->owner && bs->breakpoint_at->owner->disposition == disp_del && bs->stop) delete_breakpoint (bs->breakpoint_at->owner); ALL_BREAKPOINTS_SAFE (b, temp) { if (b->disposition == disp_del_at_next_stop) delete_breakpoint (b); } } /* A comparison function for bp_location AP and BP being interfaced to qsort. Sort elements primarily by their ADDRESS (no matter what does breakpoint_address_is_meaningful say for its OWNER), secondarily by ordering first bp_permanent OWNERed elements and terciarily just ensuring the array is sorted stable way despite qsort being an instable algorithm. */ static int bp_location_compare (const void *ap, const void *bp) { struct bp_location *a = *(void **) ap; struct bp_location *b = *(void **) bp; int a_perm = a->owner->enable_state == bp_permanent; int b_perm = b->owner->enable_state == bp_permanent; if (a->address != b->address) return (a->address > b->address) - (a->address < b->address); /* Sort permanent breakpoints first. */ if (a_perm != b_perm) return (a_perm < b_perm) - (a_perm > b_perm); /* Make the user-visible order stable across GDB runs. Locations of the same breakpoint can be sorted in arbitrary order. */ if (a->owner->number != b->owner->number) return (a->owner->number > b->owner->number) - (a->owner->number < b->owner->number); return (a > b) - (a < b); } /* Set bp_location_placed_address_before_address_max and bp_location_shadow_len_after_address_max according to the current content of the bp_location array. */ static void bp_location_target_extensions_update (void) { struct bp_location *bl, **blp_tmp; bp_location_placed_address_before_address_max = 0; bp_location_shadow_len_after_address_max = 0; ALL_BP_LOCATIONS (bl, blp_tmp) { CORE_ADDR start, end, addr; if (!bp_location_has_shadow (bl)) continue; start = bl->target_info.placed_address; end = start + bl->target_info.shadow_len; gdb_assert (bl->address >= start); addr = bl->address - start; if (addr > bp_location_placed_address_before_address_max) bp_location_placed_address_before_address_max = addr; /* Zero SHADOW_LEN would not pass bp_location_has_shadow. */ gdb_assert (bl->address < end); addr = end - bl->address; if (addr > bp_location_shadow_len_after_address_max) bp_location_shadow_len_after_address_max = addr; } } /* If SHOULD_INSERT is false, do not insert any breakpoint locations into the inferior, only remove already-inserted locations that no longer should be inserted. Functions that delete a breakpoint or breakpoints should pass false, so that deleting a breakpoint doesn't have the side effect of inserting the locations of other breakpoints that are marked not-inserted, but should_be_inserted returns true on them. This behaviour is useful is situations close to tear-down -- e.g., after an exec, while the target still has execution, but breakpoint shadows of the previous executable image should *NOT* be restored to the new image; or before detaching, where the target still has execution and wants to delete breakpoints from GDB's lists, and all breakpoints had already been removed from the inferior. */ static void update_global_location_list (int should_insert) { struct breakpoint *b; struct bp_location **locp, *loc; struct cleanup *cleanups; /* Used in the duplicates detection below. When iterating over all bp_locations, points to the first bp_location of a given address. Breakpoints and watchpoints of different types are never duplicates of each other. Keep one pointer for each type of breakpoint/watchpoint, so we only need to loop over all locations once. */ struct bp_location *bp_loc_first; /* breakpoint */ struct bp_location *wp_loc_first; /* hardware watchpoint */ struct bp_location *awp_loc_first; /* access watchpoint */ struct bp_location *rwp_loc_first; /* read watchpoint */ /* Saved former bp_location array which we compare against the newly built bp_location from the current state of ALL_BREAKPOINTS. */ struct bp_location **old_location, **old_locp; unsigned old_location_count; old_location = bp_location; old_location_count = bp_location_count; bp_location = NULL; bp_location_count = 0; cleanups = make_cleanup (xfree, old_location); ALL_BREAKPOINTS (b) for (loc = b->loc; loc; loc = loc->next) bp_location_count++; bp_location = xmalloc (sizeof (*bp_location) * bp_location_count); locp = bp_location; ALL_BREAKPOINTS (b) for (loc = b->loc; loc; loc = loc->next) *locp++ = loc; qsort (bp_location, bp_location_count, sizeof (*bp_location), bp_location_compare); bp_location_target_extensions_update (); /* Identify bp_location instances that are no longer present in the new list, and therefore should be freed. Note that it's not necessary that those locations should be removed from inferior -- if there's another location at the same address (previously marked as duplicate), we don't need to remove/insert the location. LOCP is kept in sync with OLD_LOCP, each pointing to the current and former bp_location array state respectively. */ locp = bp_location; for (old_locp = old_location; old_locp < old_location + old_location_count; old_locp++) { struct bp_location *old_loc = *old_locp; struct bp_location **loc2p; /* Tells if 'old_loc' is found amoung the new locations. If not, we have to free it. */ int found_object = 0; /* Tells if the location should remain inserted in the target. */ int keep_in_target = 0; int removed = 0; /* Skip LOCP entries which will definitely never be needed. Stop either at or being the one matching OLD_LOC. */ while (locp < bp_location + bp_location_count && (*locp)->address < old_loc->address) locp++; for (loc2p = locp; (loc2p < bp_location + bp_location_count && (*loc2p)->address == old_loc->address); loc2p++) { if (*loc2p == old_loc) { found_object = 1; break; } } /* If this location is no longer present, and inserted, look if there's maybe a new location at the same address. If so, mark that one inserted, and don't remove this one. This is needed so that we don't have a time window where a breakpoint at certain location is not inserted. */ if (old_loc->inserted) { /* If the location is inserted now, we might have to remove it. */ if (found_object && should_be_inserted (old_loc)) { /* The location is still present in the location list, and still should be inserted. Don't do anything. */ keep_in_target = 1; } else { /* The location is either no longer present, or got disabled. See if there's another location at the same address, in which case we don't need to remove this one from the target. */ if (breakpoint_address_is_meaningful (old_loc->owner)) { for (loc2p = locp; (loc2p < bp_location + bp_location_count && (*loc2p)->address == old_loc->address); loc2p++) { struct bp_location *loc2 = *loc2p; if (breakpoint_locations_match (loc2, old_loc)) { /* For the sake of should_be_inserted. Duplicates check below will fix up this later. */ loc2->duplicate = 0; if (loc2 != old_loc && should_be_inserted (loc2)) { loc2->inserted = 1; loc2->target_info = old_loc->target_info; keep_in_target = 1; break; } } } } } if (!keep_in_target) { if (remove_breakpoint (old_loc, mark_uninserted)) { /* This is just about all we can do. We could keep this location on the global list, and try to remove it next time, but there's no particular reason why we will succeed next time. Note that at this point, old_loc->owner is still valid, as delete_breakpoint frees the breakpoint only after calling us. */ printf_filtered (_("warning: Error removing breakpoint %d\n"), old_loc->owner->number); } removed = 1; } } if (!found_object) { if (removed && non_stop && breakpoint_address_is_meaningful (old_loc->owner) && !is_hardware_watchpoint (old_loc->owner)) { /* This location was removed from the target. In non-stop mode, a race condition is possible where we've removed a breakpoint, but stop events for that breakpoint are already queued and will arrive later. We apply an heuristic to be able to distinguish such SIGTRAPs from other random SIGTRAPs: we keep this breakpoint location for a bit, and will retire it after we see some number of events. The theory here is that reporting of events should, "on the average", be fair, so after a while we'll see events from all threads that have anything of interest, and no longer need to keep this breakpoint location around. We don't hold locations forever so to reduce chances of mistaking a non-breakpoint SIGTRAP for a breakpoint SIGTRAP. The heuristic failing can be disastrous on decr_pc_after_break targets. On decr_pc_after_break targets, like e.g., x86-linux, if we fail to recognize a late breakpoint SIGTRAP, because events_till_retirement has reached 0 too soon, we'll fail to do the PC adjustment, and report a random SIGTRAP to the user. When the user resumes the inferior, it will most likely immediately crash with SIGILL/SIGBUS/SEGSEGV, or worse, get silently corrupted, because of being resumed e.g., in the middle of a multi-byte instruction, or skipped a one-byte instruction. This was actually seen happen on native x86-linux, and should be less rare on targets that do not support new thread events, like remote, due to the heuristic depending on thread_count. Mistaking a random SIGTRAP for a breakpoint trap causes similar symptoms (PC adjustment applied when it shouldn't), but then again, playing with SIGTRAPs behind the debugger's back is asking for trouble. Since hardware watchpoint traps are always distinguishable from other traps, so we don't need to apply keep hardware watchpoint moribund locations around. We simply always ignore hardware watchpoint traps we can no longer explain. */ old_loc->events_till_retirement = 3 * (thread_count () + 1); old_loc->owner = NULL; VEC_safe_push (bp_location_p, moribund_locations, old_loc); } else free_bp_location (old_loc); } } /* Rescan breakpoints at the same address and section, marking the first one as "first" and any others as "duplicates". This is so that the bpt instruction is only inserted once. If we have a permanent breakpoint at the same place as BPT, make that one the official one, and the rest as duplicates. Permanent breakpoints are sorted first for the same address. Do the same for hardware watchpoints, but also considering the watchpoint's type (regular/access/read) and length. */ bp_loc_first = NULL; wp_loc_first = NULL; awp_loc_first = NULL; rwp_loc_first = NULL; ALL_BP_LOCATIONS (loc, locp) { struct breakpoint *b = loc->owner; struct bp_location **loc_first_p; if (b->enable_state == bp_disabled || b->enable_state == bp_call_disabled || b->enable_state == bp_startup_disabled || !loc->enabled || loc->shlib_disabled || !breakpoint_address_is_meaningful (b) || tracepoint_type (b)) continue; /* Permanent breakpoint should always be inserted. */ if (b->enable_state == bp_permanent && ! loc->inserted) internal_error (__FILE__, __LINE__, _("allegedly permanent breakpoint is not " "actually inserted")); if (b->type == bp_hardware_watchpoint) loc_first_p = &wp_loc_first; else if (b->type == bp_read_watchpoint) loc_first_p = &rwp_loc_first; else if (b->type == bp_access_watchpoint) loc_first_p = &awp_loc_first; else loc_first_p = &bp_loc_first; if (*loc_first_p == NULL || (overlay_debugging && loc->section != (*loc_first_p)->section) || !breakpoint_locations_match (loc, *loc_first_p)) { *loc_first_p = loc; loc->duplicate = 0; continue; } loc->duplicate = 1; if ((*loc_first_p)->owner->enable_state == bp_permanent && loc->inserted && b->enable_state != bp_permanent) internal_error (__FILE__, __LINE__, _("another breakpoint was inserted on top of " "a permanent breakpoint")); } if (breakpoints_always_inserted_mode () && should_insert && (have_live_inferiors () || (gdbarch_has_global_breakpoints (target_gdbarch)))) insert_breakpoint_locations (); do_cleanups (cleanups); } void breakpoint_retire_moribund (void) { struct bp_location *loc; int ix; for (ix = 0; VEC_iterate (bp_location_p, moribund_locations, ix, loc); ++ix) if (--(loc->events_till_retirement) == 0) { free_bp_location (loc); VEC_unordered_remove (bp_location_p, moribund_locations, ix); --ix; } } static void update_global_location_list_nothrow (int inserting) { struct gdb_exception e; TRY_CATCH (e, RETURN_MASK_ERROR) update_global_location_list (inserting); } /* Clear BPT from a BPS. */ static void bpstat_remove_breakpoint (bpstat bps, struct breakpoint *bpt) { bpstat bs; for (bs = bps; bs; bs = bs->next) if (bs->breakpoint_at && bs->breakpoint_at->owner == bpt) { bs->breakpoint_at = NULL; bs->old_val = NULL; /* bs->commands will be freed later. */ } } /* Callback for iterate_over_threads. */ static int bpstat_remove_breakpoint_callback (struct thread_info *th, void *data) { struct breakpoint *bpt = data; bpstat_remove_breakpoint (th->stop_bpstat, bpt); return 0; } /* Delete a breakpoint and clean up all traces of it in the data structures. */ void delete_breakpoint (struct breakpoint *bpt) { struct breakpoint *b; struct bp_location *loc, *next; gdb_assert (bpt != NULL); /* Has this bp already been deleted? This can happen because multiple lists can hold pointers to bp's. bpstat lists are especial culprits. One example of this happening is a watchpoint's scope bp. When the scope bp triggers, we notice that the watchpoint is out of scope, and delete it. We also delete its scope bp. But the scope bp is marked "auto-deleting", and is already on a bpstat. That bpstat is then checked for auto-deleting bp's, which are deleted. A real solution to this problem might involve reference counts in bp's, and/or giving them pointers back to their referencing bpstat's, and teaching delete_breakpoint to only free a bp's storage when no more references were extent. A cheaper bandaid was chosen. */ if (bpt->type == bp_none) return; /* At least avoid this stale reference until the reference counting of breakpoints gets resolved. */ if (bpt->related_breakpoint != NULL) { gdb_assert (bpt->related_breakpoint->related_breakpoint == bpt); bpt->related_breakpoint->disposition = disp_del_at_next_stop; bpt->related_breakpoint->related_breakpoint = NULL; bpt->related_breakpoint = NULL; } observer_notify_breakpoint_deleted (bpt->number); if (breakpoint_chain == bpt) breakpoint_chain = bpt->next; ALL_BREAKPOINTS (b) if (b->next == bpt) { b->next = bpt->next; break; } free_command_lines (&bpt->commands); if (bpt->cond_string != NULL) xfree (bpt->cond_string); if (bpt->addr_string != NULL) xfree (bpt->addr_string); if (bpt->exp != NULL) xfree (bpt->exp); if (bpt->exp_string != NULL) xfree (bpt->exp_string); if (bpt->val != NULL) value_free (bpt->val); if (bpt->source_file != NULL) xfree (bpt->source_file); if (bpt->exec_pathname != NULL) xfree (bpt->exec_pathname); clean_up_filters (&bpt->syscalls_to_be_caught); /* Be sure no bpstat's are pointing at it after it's been freed. */ /* FIXME, how can we find all bpstat's? We just check stop_bpstat for now. Note that we cannot just remove bpstats pointing at bpt from the stop_bpstat list entirely, as breakpoint commands are associated with the bpstat; if we remove it here, then the later call to bpstat_do_actions (&stop_bpstat); in event-top.c won't do anything, and temporary breakpoints with commands won't work. */ iterate_over_threads (bpstat_remove_breakpoint_callback, bpt); /* Now that breakpoint is removed from breakpoint list, update the global location list. This will remove locations that used to belong to this breakpoint. Do this before freeing the breakpoint itself, since remove_breakpoint looks at location's owner. It might be better design to have location completely self-contained, but it's not the case now. */ update_global_location_list (0); /* On the chance that someone will soon try again to delete this same bp, we mark it as deleted before freeing its storage. */ bpt->type = bp_none; xfree (bpt); } static void do_delete_breakpoint_cleanup (void *b) { delete_breakpoint (b); } struct cleanup * make_cleanup_delete_breakpoint (struct breakpoint *b) { return make_cleanup (do_delete_breakpoint_cleanup, b); } void delete_command (char *arg, int from_tty) { struct breakpoint *b, *temp; dont_repeat (); if (arg == 0) { int breaks_to_delete = 0; /* Delete all breakpoints if no argument. Do not delete internal or call-dummy breakpoints, these have to be deleted with an explicit breakpoint number argument. */ ALL_BREAKPOINTS (b) { if (b->type != bp_call_dummy && b->type != bp_shlib_event && b->type != bp_jit_event && b->type != bp_thread_event && b->type != bp_overlay_event && b->type != bp_longjmp_master && b->number >= 0) { breaks_to_delete = 1; break; } } /* Ask user only if there are some breakpoints to delete. */ if (!from_tty || (breaks_to_delete && query (_("Delete all breakpoints? ")))) { ALL_BREAKPOINTS_SAFE (b, temp) { if (b->type != bp_call_dummy && b->type != bp_shlib_event && b->type != bp_thread_event && b->type != bp_jit_event && b->type != bp_overlay_event && b->type != bp_longjmp_master && b->number >= 0) delete_breakpoint (b); } } } else map_breakpoint_numbers (arg, delete_breakpoint); } static int all_locations_are_pending (struct bp_location *loc) { for (; loc; loc = loc->next) if (!loc->shlib_disabled) return 0; return 1; } /* Subroutine of update_breakpoint_locations to simplify it. Return non-zero if multiple fns in list LOC have the same name. Null names are ignored. */ static int ambiguous_names_p (struct bp_location *loc) { struct bp_location *l; htab_t htab = htab_create_alloc (13, htab_hash_string, (int (*) (const void *, const void *)) streq, NULL, xcalloc, xfree); for (l = loc; l != NULL; l = l->next) { const char **slot; const char *name = l->function_name; /* Allow for some names to be NULL, ignore them. */ if (name == NULL) continue; slot = (const char **) htab_find_slot (htab, (const void *) name, INSERT); /* NOTE: We can assume slot != NULL here because xcalloc never returns NULL. */ if (*slot != NULL) { htab_delete (htab); return 1; } *slot = name; } htab_delete (htab); return 0; } static void update_breakpoint_locations (struct breakpoint *b, struct symtabs_and_lines sals) { int i; char *s; struct bp_location *existing_locations = b->loc; /* If there's no new locations, and all existing locations are pending, don't do anything. This optimizes the common case where all locations are in the same shared library, that was unloaded. We'd like to retain the location, so that when the library is loaded again, we don't loose the enabled/disabled status of the individual locations. */ if (all_locations_are_pending (existing_locations) && sals.nelts == 0) return; b->loc = NULL; for (i = 0; i < sals.nelts; ++i) { struct bp_location *new_loc = add_location_to_breakpoint (b, &(sals.sals[i])); /* Reparse conditions, they might contain references to the old symtab. */ if (b->cond_string != NULL) { struct gdb_exception e; s = b->cond_string; TRY_CATCH (e, RETURN_MASK_ERROR) { new_loc->cond = parse_exp_1 (&s, block_for_pc (sals.sals[i].pc), 0); } if (e.reason < 0) { warning (_("failed to reevaluate condition for breakpoint %d: %s"), b->number, e.message); new_loc->enabled = 0; } } if (b->source_file != NULL) xfree (b->source_file); if (sals.sals[i].symtab == NULL) b->source_file = NULL; else b->source_file = xstrdup (sals.sals[i].symtab->filename); if (b->line_number == 0) b->line_number = sals.sals[i].line; } /* Update locations of permanent breakpoints. */ if (b->enable_state == bp_permanent) make_breakpoint_permanent (b); /* If possible, carry over 'disable' status from existing breakpoints. */ { struct bp_location *e = existing_locations; /* If there are multiple breakpoints with the same function name, e.g. for inline functions, comparing function names won't work. Instead compare pc addresses; this is just a heuristic as things may have moved, but in practice it gives the correct answer often enough until a better solution is found. */ int have_ambiguous_names = ambiguous_names_p (b->loc); for (; e; e = e->next) { if (!e->enabled && e->function_name) { struct bp_location *l = b->loc; if (have_ambiguous_names) { for (; l; l = l->next) if (breakpoint_address_match (e->pspace->aspace, e->address, l->pspace->aspace, l->address)) { l->enabled = 0; break; } } else { for (; l; l = l->next) if (l->function_name && strcmp (e->function_name, l->function_name) == 0) { l->enabled = 0; break; } } } } } update_global_location_list (1); } /* Reset a breakpoint given it's struct breakpoint * BINT. The value we return ends up being the return value from catch_errors. Unused in this case. */ static int breakpoint_re_set_one (void *bint) { /* get past catch_errs */ struct breakpoint *b = (struct breakpoint *) bint; struct value *mark; int i; int not_found = 0; int *not_found_ptr = ¬_found; struct symtabs_and_lines sals = {0}; struct symtabs_and_lines expanded = {0}; char *s; enum enable_state save_enable; struct gdb_exception e; struct cleanup *cleanups = make_cleanup (null_cleanup, NULL); switch (b->type) { case bp_none: warning (_("attempted to reset apparently deleted breakpoint #%d?"), b->number); return 0; case bp_breakpoint: case bp_hardware_breakpoint: case bp_tracepoint: case bp_fast_tracepoint: /* Do not attempt to re-set breakpoints disabled during startup. */ if (b->enable_state == bp_startup_disabled) return 0; if (b->addr_string == NULL) { /* Anything without a string can't be re-set. */ delete_breakpoint (b); return 0; } set_language (b->language); input_radix = b->input_radix; s = b->addr_string; save_current_space_and_thread (); switch_to_program_space_and_thread (b->pspace); TRY_CATCH (e, RETURN_MASK_ERROR) { sals = decode_line_1 (&s, 1, (struct symtab *) NULL, 0, (char ***) NULL, not_found_ptr); } if (e.reason < 0) { int not_found_and_ok = 0; /* For pending breakpoints, it's expected that parsing will fail until the right shared library is loaded. User has already told to create pending breakpoints and don't need extra messages. If breakpoint is in bp_shlib_disabled state, then user already saw the message about that breakpoint being disabled, and don't want to see more errors. */ if (not_found && (b->condition_not_parsed || (b->loc && b->loc->shlib_disabled) || b->enable_state == bp_disabled)) not_found_and_ok = 1; if (!not_found_and_ok) { /* We surely don't want to warn about the same breakpoint 10 times. One solution, implemented here, is disable the breakpoint on error. Another solution would be to have separate 'warning emitted' flag. Since this happens only when a binary has changed, I don't know which approach is better. */ b->enable_state = bp_disabled; throw_exception (e); } } if (!not_found) { gdb_assert (sals.nelts == 1); resolve_sal_pc (&sals.sals[0]); if (b->condition_not_parsed && s && s[0]) { char *cond_string = 0; int thread = -1; int task = 0; find_condition_and_thread (s, sals.sals[0].pc, &cond_string, &thread, &task); if (cond_string) b->cond_string = cond_string; b->thread = thread; b->task = task; b->condition_not_parsed = 0; } expanded = expand_line_sal_maybe (sals.sals[0]); } make_cleanup (xfree, sals.sals); update_breakpoint_locations (b, expanded); break; case bp_watchpoint: case bp_hardware_watchpoint: case bp_read_watchpoint: case bp_access_watchpoint: /* Watchpoint can be either on expression using entirely global variables, or it can be on local variables. Watchpoints of the first kind are never auto-deleted, and even persist across program restarts. Since they can use variables from shared libraries, we need to reparse expression as libraries are loaded and unloaded. Watchpoints on local variables can also change meaning as result of solib event. For example, if a watchpoint uses both a local and a global variables in expression, it's a local watchpoint, but unloading of a shared library will make the expression invalid. This is not a very common use case, but we still re-evaluate expression, to avoid surprises to the user. Note that for local watchpoints, we re-evaluate it only if watchpoints frame id is still valid. If it's not, it means the watchpoint is out of scope and will be deleted soon. In fact, I'm not sure we'll ever be called in this case. If a local watchpoint's frame id is still valid, then b->exp_valid_block is likewise valid, and we can safely use it. Don't do anything about disabled watchpoints, since they will be reevaluated again when enabled. */ update_watchpoint (b, 1 /* reparse */); break; /* We needn't really do anything to reset these, since the mask that requests them is unaffected by e.g., new libraries being loaded. */ case bp_catchpoint: break; default: printf_filtered (_("Deleting unknown breakpoint type %d\n"), b->type); /* fall through */ /* Delete overlay event and longjmp master breakpoints; they will be reset later by breakpoint_re_set. */ case bp_overlay_event: case bp_longjmp_master: delete_breakpoint (b); break; /* This breakpoint is special, it's set up when the inferior starts and we really don't want to touch it. */ case bp_shlib_event: /* Like bp_shlib_event, this breakpoint type is special. Once it is set up, we do not want to touch it. */ case bp_thread_event: /* Keep temporary breakpoints, which can be encountered when we step over a dlopen call and SOLIB_ADD is resetting the breakpoints. Otherwise these should have been blown away via the cleanup chain or by breakpoint_init_inferior when we rerun the executable. */ case bp_until: case bp_finish: case bp_watchpoint_scope: case bp_call_dummy: case bp_step_resume: case bp_longjmp: case bp_longjmp_resume: case bp_jit_event: break; } do_cleanups (cleanups); return 0; } /* Re-set all breakpoints after symbols have been re-loaded. */ void breakpoint_re_set (void) { struct breakpoint *b, *temp; enum language save_language; int save_input_radix; struct cleanup *old_chain; save_language = current_language->la_language; save_input_radix = input_radix; old_chain = save_current_program_space (); ALL_BREAKPOINTS_SAFE (b, temp) { /* Format possible error msg */ char *message = xstrprintf ("Error in re-setting breakpoint %d: ", b->number); struct cleanup *cleanups = make_cleanup (xfree, message); catch_errors (breakpoint_re_set_one, b, message, RETURN_MASK_ALL); do_cleanups (cleanups); } set_language (save_language); input_radix = save_input_radix; jit_breakpoint_re_set (); do_cleanups (old_chain); create_overlay_event_breakpoint ("_ovly_debug_event"); create_longjmp_master_breakpoint ("longjmp"); create_longjmp_master_breakpoint ("_longjmp"); create_longjmp_master_breakpoint ("siglongjmp"); create_longjmp_master_breakpoint ("_siglongjmp"); } /* Reset the thread number of this breakpoint: - If the breakpoint is for all threads, leave it as-is. - Else, reset it to the current thread for inferior_ptid. */ void breakpoint_re_set_thread (struct breakpoint *b) { if (b->thread != -1) { if (in_thread_list (inferior_ptid)) b->thread = pid_to_thread_id (inferior_ptid); /* We're being called after following a fork. The new fork is selected as current, and unless this was a vfork will have a different program space from the original thread. Reset that as well. */ b->loc->pspace = current_program_space; } } /* Set ignore-count of breakpoint number BPTNUM to COUNT. If from_tty is nonzero, it prints a message to that effect, which ends with a period (no newline). */ void set_ignore_count (int bptnum, int count, int from_tty) { struct breakpoint *b; if (count < 0) count = 0; ALL_BREAKPOINTS (b) if (b->number == bptnum) { b->ignore_count = count; if (from_tty) { if (count == 0) printf_filtered (_("Will stop next time breakpoint %d is reached."), bptnum); else if (count == 1) printf_filtered (_("Will ignore next crossing of breakpoint %d."), bptnum); else printf_filtered (_("Will ignore next %d crossings of breakpoint %d."), count, bptnum); } breakpoints_changed (); observer_notify_breakpoint_modified (b->number); return; } error (_("No breakpoint number %d."), bptnum); } void make_breakpoint_silent (struct breakpoint *b) { /* Silence the breakpoint. */ b->silent = 1; } /* Command to set ignore-count of breakpoint N to COUNT. */ static void ignore_command (char *args, int from_tty) { char *p = args; int num; if (p == 0) error_no_arg (_("a breakpoint number")); num = get_number (&p); if (num == 0) error (_("bad breakpoint number: '%s'"), args); if (*p == 0) error (_("Second argument (specified ignore-count) is missing.")); set_ignore_count (num, longest_to_int (value_as_long (parse_and_eval (p))), from_tty); if (from_tty) printf_filtered ("\n"); } /* Call FUNCTION on each of the breakpoints whose numbers are given in ARGS. */ static void map_breakpoint_numbers (char *args, void (*function) (struct breakpoint *)) { char *p = args; char *p1; int num; struct breakpoint *b, *tmp; int match; if (p == 0) error_no_arg (_("one or more breakpoint numbers")); while (*p) { match = 0; p1 = p; num = get_number_or_range (&p1); if (num == 0) { warning (_("bad breakpoint number at or near '%s'"), p); } else { ALL_BREAKPOINTS_SAFE (b, tmp) if (b->number == num) { struct breakpoint *related_breakpoint = b->related_breakpoint; match = 1; function (b); if (related_breakpoint) function (related_breakpoint); break; } if (match == 0) printf_unfiltered (_("No breakpoint number %d.\n"), num); } p = p1; } } static struct bp_location * find_location_by_number (char *number) { char *dot = strchr (number, '.'); char *p1; int bp_num; int loc_num; struct breakpoint *b; struct bp_location *loc; *dot = '\0'; p1 = number; bp_num = get_number_or_range (&p1); if (bp_num == 0) error (_("Bad breakpoint number '%s'"), number); ALL_BREAKPOINTS (b) if (b->number == bp_num) { break; } if (!b || b->number != bp_num) error (_("Bad breakpoint number '%s'"), number); p1 = dot+1; loc_num = get_number_or_range (&p1); if (loc_num == 0) error (_("Bad breakpoint location number '%s'"), number); --loc_num; loc = b->loc; for (;loc_num && loc; --loc_num, loc = loc->next) ; if (!loc) error (_("Bad breakpoint location number '%s'"), dot+1); return loc; } /* Set ignore-count of breakpoint number BPTNUM to COUNT. If from_tty is nonzero, it prints a message to that effect, which ends with a period (no newline). */ void disable_breakpoint (struct breakpoint *bpt) { /* Never disable a watchpoint scope breakpoint; we want to hit them when we leave scope so we can delete both the watchpoint and its scope breakpoint at that time. */ if (bpt->type == bp_watchpoint_scope) return; /* You can't disable permanent breakpoints. */ if (bpt->enable_state == bp_permanent) return; bpt->enable_state = bp_disabled; update_global_location_list (0); observer_notify_breakpoint_modified (bpt->number); } static void disable_command (char *args, int from_tty) { struct breakpoint *bpt; if (args == 0) ALL_BREAKPOINTS (bpt) switch (bpt->type) { case bp_none: warning (_("attempted to disable apparently deleted breakpoint #%d?"), bpt->number); continue; case bp_breakpoint: case bp_tracepoint: case bp_fast_tracepoint: case bp_catchpoint: case bp_hardware_breakpoint: case bp_watchpoint: case bp_hardware_watchpoint: case bp_read_watchpoint: case bp_access_watchpoint: disable_breakpoint (bpt); default: continue; } else if (strchr (args, '.')) { struct bp_location *loc = find_location_by_number (args); if (loc) loc->enabled = 0; update_global_location_list (0); } else map_breakpoint_numbers (args, disable_breakpoint); } static void do_enable_breakpoint (struct breakpoint *bpt, enum bpdisp disposition) { int target_resources_ok, other_type_used; struct value *mark; if (bpt->type == bp_hardware_breakpoint) { int i; i = hw_breakpoint_used_count (); target_resources_ok = target_can_use_hardware_watchpoint (bp_hardware_breakpoint, i + 1, 0); if (target_resources_ok == 0) error (_("No hardware breakpoint support in the target.")); else if (target_resources_ok < 0) error (_("Hardware breakpoints used exceeds limit.")); } if (bpt->type == bp_watchpoint || bpt->type == bp_hardware_watchpoint || bpt->type == bp_read_watchpoint || bpt->type == bp_access_watchpoint) { struct gdb_exception e; TRY_CATCH (e, RETURN_MASK_ALL) { update_watchpoint (bpt, 1 /* reparse */); } if (e.reason < 0) { exception_fprintf (gdb_stderr, e, _("Cannot enable watchpoint %d: "), bpt->number); return; } } if (bpt->enable_state != bp_permanent) bpt->enable_state = bp_enabled; bpt->disposition = disposition; update_global_location_list (1); breakpoints_changed (); observer_notify_breakpoint_modified (bpt->number); } void enable_breakpoint (struct breakpoint *bpt) { do_enable_breakpoint (bpt, bpt->disposition); } /* The enable command enables the specified breakpoints (or all defined breakpoints) so they once again become (or continue to be) effective in stopping the inferior. */ static void enable_command (char *args, int from_tty) { struct breakpoint *bpt; if (args == 0) ALL_BREAKPOINTS (bpt) switch (bpt->type) { case bp_none: warning (_("attempted to enable apparently deleted breakpoint #%d?"), bpt->number); continue; case bp_breakpoint: case bp_tracepoint: case bp_fast_tracepoint: case bp_catchpoint: case bp_hardware_breakpoint: case bp_watchpoint: case bp_hardware_watchpoint: case bp_read_watchpoint: case bp_access_watchpoint: enable_breakpoint (bpt); default: continue; } else if (strchr (args, '.')) { struct bp_location *loc = find_location_by_number (args); if (loc) loc->enabled = 1; update_global_location_list (1); } else map_breakpoint_numbers (args, enable_breakpoint); } static void enable_once_breakpoint (struct breakpoint *bpt) { do_enable_breakpoint (bpt, disp_disable); } static void enable_once_command (char *args, int from_tty) { map_breakpoint_numbers (args, enable_once_breakpoint); } static void enable_delete_breakpoint (struct breakpoint *bpt) { do_enable_breakpoint (bpt, disp_del); } static void enable_delete_command (char *args, int from_tty) { map_breakpoint_numbers (args, enable_delete_breakpoint); } static void set_breakpoint_cmd (char *args, int from_tty) { } static void show_breakpoint_cmd (char *args, int from_tty) { } /* Invalidate last known value of any hardware watchpoint if the memory which that value represents has been written to by GDB itself. */ static void invalidate_bp_value_on_memory_change (CORE_ADDR addr, int len, const bfd_byte *data) { struct breakpoint *bp; ALL_BREAKPOINTS (bp) if (bp->enable_state == bp_enabled && bp->type == bp_hardware_watchpoint && bp->val_valid && bp->val) { struct bp_location *loc; for (loc = bp->loc; loc != NULL; loc = loc->next) if (loc->loc_type == bp_loc_hardware_watchpoint && loc->address + loc->length > addr && addr + len > loc->address) { value_free (bp->val); bp->val = NULL; bp->val_valid = 0; } } } /* Use default_breakpoint_'s, or nothing if they aren't valid. */ struct symtabs_and_lines decode_line_spec_1 (char *string, int funfirstline) { struct symtabs_and_lines sals; if (string == 0) error (_("Empty line specification.")); if (default_breakpoint_valid) sals = decode_line_1 (&string, funfirstline, default_breakpoint_symtab, default_breakpoint_line, (char ***) NULL, NULL); else sals = decode_line_1 (&string, funfirstline, (struct symtab *) NULL, 0, (char ***) NULL, NULL); if (*string) error (_("Junk at end of line specification: %s"), string); return sals; } /* Create and insert a raw software breakpoint at PC. Return an identifier, which should be used to remove the breakpoint later. In general, places which call this should be using something on the breakpoint chain instead; this function should be eliminated someday. */ void * deprecated_insert_raw_breakpoint (struct gdbarch *gdbarch, struct address_space *aspace, CORE_ADDR pc) { struct bp_target_info *bp_tgt; bp_tgt = XZALLOC (struct bp_target_info); bp_tgt->placed_address_space = aspace; bp_tgt->placed_address = pc; if (target_insert_breakpoint (gdbarch, bp_tgt) != 0) { /* Could not insert the breakpoint. */ xfree (bp_tgt); return NULL; } return bp_tgt; } /* Remove a breakpoint BP inserted by deprecated_insert_raw_breakpoint. */ int deprecated_remove_raw_breakpoint (struct gdbarch *gdbarch, void *bp) { struct bp_target_info *bp_tgt = bp; int ret; ret = target_remove_breakpoint (gdbarch, bp_tgt); xfree (bp_tgt); return ret; } /* One (or perhaps two) breakpoints used for software single stepping. */ static void *single_step_breakpoints[2]; static struct gdbarch *single_step_gdbarch[2]; /* Create and insert a breakpoint for software single step. */ void insert_single_step_breakpoint (struct gdbarch *gdbarch, struct address_space *aspace, CORE_ADDR next_pc) { void **bpt_p; if (single_step_breakpoints[0] == NULL) { bpt_p = &single_step_breakpoints[0]; single_step_gdbarch[0] = gdbarch; } else { gdb_assert (single_step_breakpoints[1] == NULL); bpt_p = &single_step_breakpoints[1]; single_step_gdbarch[1] = gdbarch; } /* NOTE drow/2006-04-11: A future improvement to this function would be to only create the breakpoints once, and actually put them on the breakpoint chain. That would let us use set_raw_breakpoint. We could adjust the addresses each time they were needed. Doing this requires corresponding changes elsewhere where single step breakpoints are handled, however. So, for now, we use this. */ *bpt_p = deprecated_insert_raw_breakpoint (gdbarch, aspace, next_pc); if (*bpt_p == NULL) error (_("Could not insert single-step breakpoint at %s"), paddress (gdbarch, next_pc)); } /* Remove and delete any breakpoints used for software single step. */ void remove_single_step_breakpoints (void) { gdb_assert (single_step_breakpoints[0] != NULL); /* See insert_single_step_breakpoint for more about this deprecated call. */ deprecated_remove_raw_breakpoint (single_step_gdbarch[0], single_step_breakpoints[0]); single_step_gdbarch[0] = NULL; single_step_breakpoints[0] = NULL; if (single_step_breakpoints[1] != NULL) { deprecated_remove_raw_breakpoint (single_step_gdbarch[1], single_step_breakpoints[1]); single_step_gdbarch[1] = NULL; single_step_breakpoints[1] = NULL; } } /* Check whether a software single-step breakpoint is inserted at PC. */ static int single_step_breakpoint_inserted_here_p (struct address_space *aspace, CORE_ADDR pc) { int i; for (i = 0; i < 2; i++) { struct bp_target_info *bp_tgt = single_step_breakpoints[i]; if (bp_tgt && breakpoint_address_match (bp_tgt->placed_address_space, bp_tgt->placed_address, aspace, pc)) return 1; } return 0; } /* Returns 0 if 'bp' is NOT a syscall catchpoint, non-zero otherwise. */ static int is_syscall_catchpoint_enabled (struct breakpoint *bp) { if (syscall_catchpoint_p (bp) && bp->enable_state != bp_disabled && bp->enable_state != bp_call_disabled) return 1; else return 0; } int catch_syscall_enabled (void) { struct inferior *inf = current_inferior (); return inf->total_syscalls_count != 0; } int catching_syscall_number (int syscall_number) { struct breakpoint *bp; ALL_BREAKPOINTS (bp) if (is_syscall_catchpoint_enabled (bp)) { if (bp->syscalls_to_be_caught) { int i, iter; for (i = 0; VEC_iterate (int, bp->syscalls_to_be_caught, i, iter); i++) if (syscall_number == iter) return 1; } else return 1; } return 0; } /* Complete syscall names. Used by "catch syscall". */ static char ** catch_syscall_completer (struct cmd_list_element *cmd, char *text, char *word) { const char **list = get_syscall_names (); return (list == NULL) ? NULL : complete_on_enum (list, text, word); } /* Tracepoint-specific operations. */ /* Set tracepoint count to NUM. */ static void set_tracepoint_count (int num) { tracepoint_count = num; set_internalvar_integer (lookup_internalvar ("tpnum"), num); } void trace_command (char *arg, int from_tty) { if (break_command_really (get_current_arch (), arg, NULL, 0, 1 /* parse arg */, 0 /* tempflag */, 0 /* hardwareflag */, 1 /* traceflag */, 0 /* Ignore count */, pending_break_support, NULL, from_tty, 1 /* enabled */)) set_tracepoint_count (breakpoint_count); } void ftrace_command (char *arg, int from_tty) { if (break_command_really (get_current_arch (), arg, NULL, 0, 1 /* parse arg */, 0 /* tempflag */, 1 /* hardwareflag */, 1 /* traceflag */, 0 /* Ignore count */, pending_break_support, NULL, from_tty, 1 /* enabled */)) set_tracepoint_count (breakpoint_count); } /* Given information about a tracepoint as recorded on a target (which can be either a live system or a trace file), attempt to create an equivalent GDB tracepoint. This is not a reliable process, since the target does not necessarily have all the information used when the tracepoint was originally defined. */ struct breakpoint * create_tracepoint_from_upload (struct uploaded_tp *utp) { char buf[100]; struct breakpoint *tp; /* In the absence of a source location, fall back to raw address. */ sprintf (buf, "*%s", paddress (get_current_arch(), utp->addr)); if (!break_command_really (get_current_arch (), buf, NULL, 0, 1 /* parse arg */, 0 /* tempflag */, (utp->type == bp_fast_tracepoint) /* hardwareflag */, 1 /* traceflag */, 0 /* Ignore count */, pending_break_support, NULL, 0 /* from_tty */, utp->enabled /* enabled */)) return NULL; set_tracepoint_count (breakpoint_count); tp = get_tracepoint (tracepoint_count); gdb_assert (tp != NULL); if (utp->pass > 0) { sprintf (buf, "%d %d", utp->pass, tp->number); trace_pass_command (buf, 0); } if (utp->cond) { printf_filtered ("Want to restore a condition\n"); } if (utp->numactions > 0) { printf_filtered ("Want to restore action list\n"); } if (utp->num_step_actions > 0) { printf_filtered ("Want to restore action list\n"); } return tp; } /* Print information on tracepoint number TPNUM_EXP, or all if omitted. */ static void tracepoints_info (char *tpnum_exp, int from_tty) { struct breakpoint *b; int tps_to_list = 0; /* In the no-arguments case, say "No tracepoints" if none found. */ if (tpnum_exp == 0) { ALL_TRACEPOINTS (b) { if (b->number >= 0) { tps_to_list = 1; break; } } if (!tps_to_list) { ui_out_message (uiout, 0, "No tracepoints.\n"); return; } } /* Otherwise be the same as "info break". */ breakpoints_info (tpnum_exp, from_tty); } /* The 'enable trace' command enables tracepoints. Not supported by all targets. */ static void enable_trace_command (char *args, int from_tty) { enable_command (args, from_tty); } /* The 'disable trace' command disables tracepoints. Not supported by all targets. */ static void disable_trace_command (char *args, int from_tty) { disable_command (args, from_tty); } /* Remove a tracepoint (or all if no argument) */ static void delete_trace_command (char *arg, int from_tty) { struct breakpoint *b, *temp; dont_repeat (); if (arg == 0) { int breaks_to_delete = 0; /* Delete all breakpoints if no argument. Do not delete internal or call-dummy breakpoints, these have to be deleted with an explicit breakpoint number argument. */ ALL_TRACEPOINTS (b) { if (b->number >= 0) { breaks_to_delete = 1; break; } } /* Ask user only if there are some breakpoints to delete. */ if (!from_tty || (breaks_to_delete && query (_("Delete all tracepoints? ")))) { ALL_BREAKPOINTS_SAFE (b, temp) { if (tracepoint_type (b) && b->number >= 0) delete_breakpoint (b); } } } else map_breakpoint_numbers (arg, delete_breakpoint); } /* Set passcount for tracepoint. First command argument is passcount, second is tracepoint number. If tracepoint number omitted, apply to most recently defined. Also accepts special argument "all". */ static void trace_pass_command (char *args, int from_tty) { struct breakpoint *t1 = (struct breakpoint *) -1, *t2; unsigned int count; int all = 0; if (args == 0 || *args == 0) error (_("passcount command requires an argument (count + optional TP num)")); count = strtoul (args, &args, 10); /* Count comes first, then TP num. */ while (*args && isspace ((int) *args)) args++; if (*args && strncasecmp (args, "all", 3) == 0) { args += 3; /* Skip special argument "all". */ all = 1; if (*args) error (_("Junk at end of arguments.")); } else t1 = get_tracepoint_by_number (&args, 1, 1); do { if (t1) { ALL_TRACEPOINTS (t2) if (t1 == (struct breakpoint *) -1 || t1 == t2) { t2->pass_count = count; observer_notify_tracepoint_modified (t2->number); if (from_tty) printf_filtered (_("Setting tracepoint %d's passcount to %d\n"), t2->number, count); } if (! all && *args) t1 = get_tracepoint_by_number (&args, 1, 0); } } while (*args); } struct breakpoint * get_tracepoint (int num) { struct breakpoint *t; ALL_TRACEPOINTS (t) if (t->number == num) return t; return NULL; } /* Find the tracepoint with the given target-side number (which may be different from the tracepoint number after disconnecting and reconnecting). */ struct breakpoint * get_tracepoint_by_number_on_target (int num) { struct breakpoint *t; ALL_TRACEPOINTS (t) if (t->number_on_target == num) return t; return NULL; } /* Utility: parse a tracepoint number and look it up in the list. If MULTI_P is true, there might be a range of tracepoints in ARG. if OPTIONAL_P is true, then if the argument is missing, the most recent tracepoint (tracepoint_count) is returned. */ struct breakpoint * get_tracepoint_by_number (char **arg, int multi_p, int optional_p) { extern int tracepoint_count; struct breakpoint *t; int tpnum; char *instring = arg == NULL ? NULL : *arg; if (arg == NULL || *arg == NULL || ! **arg) { if (optional_p) tpnum = tracepoint_count; else error_no_arg (_("tracepoint number")); } else tpnum = multi_p ? get_number_or_range (arg) : get_number (arg); if (tpnum <= 0) { if (instring && *instring) printf_filtered (_("bad tracepoint number at or near '%s'\n"), instring); else printf_filtered (_("Tracepoint argument missing and no previous tracepoint\n")); return NULL; } ALL_TRACEPOINTS (t) if (t->number == tpnum) { return t; } /* FIXME: if we are in the middle of a range we don't want to give a message. The current interface to get_number_or_range doesn't allow us to discover this. */ printf_unfiltered ("No tracepoint number %d.\n", tpnum); return NULL; } /* save-tracepoints command */ static void tracepoint_save_command (char *args, int from_tty) { struct breakpoint *tp; int any_tp = 0; struct action_line *line; FILE *fp; char *i1 = " ", *i2 = " "; char *indent, *actionline, *pathname; char tmp[40]; struct cleanup *cleanup; if (args == 0 || *args == 0) error (_("Argument required (file name in which to save tracepoints)")); /* See if we have anything to save. */ ALL_TRACEPOINTS (tp) { any_tp = 1; break; } if (!any_tp) { warning (_("save-tracepoints: no tracepoints to save.")); return; } pathname = tilde_expand (args); cleanup = make_cleanup (xfree, pathname); fp = fopen (pathname, "w"); if (!fp) error (_("Unable to open file '%s' for saving tracepoints (%s)"), args, safe_strerror (errno)); make_cleanup_fclose (fp); ALL_TRACEPOINTS (tp) { if (tp->addr_string) fprintf (fp, "trace %s\n", tp->addr_string); else { sprintf_vma (tmp, tp->loc->address); fprintf (fp, "trace *0x%s\n", tmp); } if (tp->pass_count) fprintf (fp, " passcount %d\n", tp->pass_count); if (tp->actions) { fprintf (fp, " actions\n"); indent = i1; for (line = tp->actions; line; line = line->next) { struct cmd_list_element *cmd; QUIT; /* allow user to bail out with ^C */ actionline = line->action; while (isspace ((int) *actionline)) actionline++; fprintf (fp, "%s%s\n", indent, actionline); if (*actionline != '#') /* skip for comment lines */ { cmd = lookup_cmd (&actionline, cmdlist, "", -1, 1); if (cmd == 0) error (_("Bad action list item: %s"), actionline); if (cmd_cfunc_eq (cmd, while_stepping_pseudocommand)) indent = i2; else if (cmd_cfunc_eq (cmd, end_actions_pseudocommand)) indent = i1; } } } } do_cleanups (cleanup); if (from_tty) printf_filtered (_("Tracepoints saved to file '%s'.\n"), args); return; } /* Create a vector of all tracepoints. */ VEC(breakpoint_p) * all_tracepoints () { VEC(breakpoint_p) *tp_vec = 0; struct breakpoint *tp; ALL_TRACEPOINTS (tp) { VEC_safe_push (breakpoint_p, tp_vec, tp); } return tp_vec; } /* This help string is used for the break, hbreak, tbreak and thbreak commands. It is defined as a macro to prevent duplication. COMMAND should be a string constant containing the name of the command. */ #define BREAK_ARGS_HELP(command) \ command" [LOCATION] [thread THREADNUM] [if CONDITION]\n\ LOCATION may be a line number, function name, or \"*\" and an address.\n\ If a line number is specified, break at start of code for that line.\n\ If a function is specified, break at start of code for that function.\n\ If an address is specified, break at that exact address.\n\ With no LOCATION, uses current execution address of selected stack frame.\n\ This is useful for breaking on return to a stack frame.\n\ \n\ THREADNUM is the number from \"info threads\".\n\ CONDITION is a boolean expression.\n\ \n\ Multiple breakpoints at one place are permitted, and useful if conditional.\n\ \n\ Do \"help breakpoints\" for info on other commands dealing with breakpoints." /* List of subcommands for "catch". */ static struct cmd_list_element *catch_cmdlist; /* List of subcommands for "tcatch". */ static struct cmd_list_element *tcatch_cmdlist; /* Like add_cmd, but add the command to both the "catch" and "tcatch" lists, and pass some additional user data to the command function. */ static void add_catch_command (char *name, char *docstring, void (*sfunc) (char *args, int from_tty, struct cmd_list_element *command), char **(*completer) (struct cmd_list_element *cmd, char *text, char *word), void *user_data_catch, void *user_data_tcatch) { struct cmd_list_element *command; command = add_cmd (name, class_breakpoint, NULL, docstring, &catch_cmdlist); set_cmd_sfunc (command, sfunc); set_cmd_context (command, user_data_catch); set_cmd_completer (command, completer); command = add_cmd (name, class_breakpoint, NULL, docstring, &tcatch_cmdlist); set_cmd_sfunc (command, sfunc); set_cmd_context (command, user_data_tcatch); set_cmd_completer (command, completer); } static void clear_syscall_counts (int pid) { struct inferior *inf = find_inferior_pid (pid); inf->total_syscalls_count = 0; inf->any_syscall_count = 0; VEC_free (int, inf->syscalls_counts); } void _initialize_breakpoint (void) { static struct cmd_list_element *breakpoint_set_cmdlist; static struct cmd_list_element *breakpoint_show_cmdlist; struct cmd_list_element *c; observer_attach_solib_unloaded (disable_breakpoints_in_unloaded_shlib); observer_attach_inferior_exit (clear_syscall_counts); observer_attach_memory_changed (invalidate_bp_value_on_memory_change); breakpoint_chain = 0; /* Don't bother to call set_breakpoint_count. $bpnum isn't useful before a breakpoint is set. */ breakpoint_count = 0; tracepoint_count = 0; add_com ("ignore", class_breakpoint, ignore_command, _("\ Set ignore-count of breakpoint number N to COUNT.\n\ Usage is `ignore N COUNT'.")); if (xdb_commands) add_com_alias ("bc", "ignore", class_breakpoint, 1); add_com ("commands", class_breakpoint, commands_command, _("\ Set commands to be executed when a breakpoint is hit.\n\ Give breakpoint number as argument after \"commands\".\n\ With no argument, the targeted breakpoint is the last one set.\n\ The commands themselves follow starting on the next line.\n\ Type a line containing \"end\" to indicate the end of them.\n\ Give \"silent\" as the first line to make the breakpoint silent;\n\ then no output is printed when it is hit, except what the commands print.")); add_com ("condition", class_breakpoint, condition_command, _("\ Specify breakpoint number N to break only if COND is true.\n\ Usage is `condition N COND', where N is an integer and COND is an\n\ expression to be evaluated whenever breakpoint N is reached.")); c = add_com ("tbreak", class_breakpoint, tbreak_command, _("\ Set a temporary breakpoint.\n\ Like \"break\" except the breakpoint is only temporary,\n\ so it will be deleted when hit. Equivalent to \"break\" followed\n\ by using \"enable delete\" on the breakpoint number.\n\ \n" BREAK_ARGS_HELP ("tbreak"))); set_cmd_completer (c, location_completer); c = add_com ("hbreak", class_breakpoint, hbreak_command, _("\ Set a hardware assisted breakpoint.\n\ Like \"break\" except the breakpoint requires hardware support,\n\ some target hardware may not have this support.\n\ \n" BREAK_ARGS_HELP ("hbreak"))); set_cmd_completer (c, location_completer); c = add_com ("thbreak", class_breakpoint, thbreak_command, _("\ Set a temporary hardware assisted breakpoint.\n\ Like \"hbreak\" except the breakpoint is only temporary,\n\ so it will be deleted when hit.\n\ \n" BREAK_ARGS_HELP ("thbreak"))); set_cmd_completer (c, location_completer); add_prefix_cmd ("enable", class_breakpoint, enable_command, _("\ Enable some breakpoints.\n\ Give breakpoint numbers (separated by spaces) as arguments.\n\ With no subcommand, breakpoints are enabled until you command otherwise.\n\ This is used to cancel the effect of the \"disable\" command.\n\ With a subcommand you can enable temporarily."), &enablelist, "enable ", 1, &cmdlist); if (xdb_commands) add_com ("ab", class_breakpoint, enable_command, _("\ Enable some breakpoints.\n\ Give breakpoint numbers (separated by spaces) as arguments.\n\ With no subcommand, breakpoints are enabled until you command otherwise.\n\ This is used to cancel the effect of the \"disable\" command.\n\ With a subcommand you can enable temporarily.")); add_com_alias ("en", "enable", class_breakpoint, 1); add_abbrev_prefix_cmd ("breakpoints", class_breakpoint, enable_command, _("\ Enable some breakpoints.\n\ Give breakpoint numbers (separated by spaces) as arguments.\n\ This is used to cancel the effect of the \"disable\" command.\n\ May be abbreviated to simply \"enable\".\n"), &enablebreaklist, "enable breakpoints ", 1, &enablelist); add_cmd ("once", no_class, enable_once_command, _("\ Enable breakpoints for one hit. Give breakpoint numbers.\n\ If a breakpoint is hit while enabled in this fashion, it becomes disabled."), &enablebreaklist); add_cmd ("delete", no_class, enable_delete_command, _("\ Enable breakpoints and delete when hit. Give breakpoint numbers.\n\ If a breakpoint is hit while enabled in this fashion, it is deleted."), &enablebreaklist); add_cmd ("delete", no_class, enable_delete_command, _("\ Enable breakpoints and delete when hit. Give breakpoint numbers.\n\ If a breakpoint is hit while enabled in this fashion, it is deleted."), &enablelist); add_cmd ("once", no_class, enable_once_command, _("\ Enable breakpoints for one hit. Give breakpoint numbers.\n\ If a breakpoint is hit while enabled in this fashion, it becomes disabled."), &enablelist); add_prefix_cmd ("disable", class_breakpoint, disable_command, _("\ Disable some breakpoints.\n\ Arguments are breakpoint numbers with spaces in between.\n\ To disable all breakpoints, give no argument.\n\ A disabled breakpoint is not forgotten, but has no effect until reenabled."), &disablelist, "disable ", 1, &cmdlist); add_com_alias ("dis", "disable", class_breakpoint, 1); add_com_alias ("disa", "disable", class_breakpoint, 1); if (xdb_commands) add_com ("sb", class_breakpoint, disable_command, _("\ Disable some breakpoints.\n\ Arguments are breakpoint numbers with spaces in between.\n\ To disable all breakpoints, give no argument.\n\ A disabled breakpoint is not forgotten, but has no effect until reenabled.")); add_cmd ("breakpoints", class_alias, disable_command, _("\ Disable some breakpoints.\n\ Arguments are breakpoint numbers with spaces in between.\n\ To disable all breakpoints, give no argument.\n\ A disabled breakpoint is not forgotten, but has no effect until reenabled.\n\ This command may be abbreviated \"disable\"."), &disablelist); add_prefix_cmd ("delete", class_breakpoint, delete_command, _("\ Delete some breakpoints or auto-display expressions.\n\ Arguments are breakpoint numbers with spaces in between.\n\ To delete all breakpoints, give no argument.\n\ \n\ Also a prefix command for deletion of other GDB objects.\n\ The \"unset\" command is also an alias for \"delete\"."), &deletelist, "delete ", 1, &cmdlist); add_com_alias ("d", "delete", class_breakpoint, 1); add_com_alias ("del", "delete", class_breakpoint, 1); if (xdb_commands) add_com ("db", class_breakpoint, delete_command, _("\ Delete some breakpoints.\n\ Arguments are breakpoint numbers with spaces in between.\n\ To delete all breakpoints, give no argument.\n")); add_cmd ("breakpoints", class_alias, delete_command, _("\ Delete some breakpoints or auto-display expressions.\n\ Arguments are breakpoint numbers with spaces in between.\n\ To delete all breakpoints, give no argument.\n\ This command may be abbreviated \"delete\"."), &deletelist); add_com ("clear", class_breakpoint, clear_command, _("\ Clear breakpoint at specified line or function.\n\ Argument may be line number, function name, or \"*\" and an address.\n\ If line number is specified, all breakpoints in that line are cleared.\n\ If function is specified, breakpoints at beginning of function are cleared.\n\ If an address is specified, breakpoints at that address are cleared.\n\ \n\ With no argument, clears all breakpoints in the line that the selected frame\n\ is executing in.\n\ \n\ See also the \"delete\" command which clears breakpoints by number.")); c = add_com ("break", class_breakpoint, break_command, _("\ Set breakpoint at specified line or function.\n" BREAK_ARGS_HELP ("break"))); set_cmd_completer (c, location_completer); add_com_alias ("b", "break", class_run, 1); add_com_alias ("br", "break", class_run, 1); add_com_alias ("bre", "break", class_run, 1); add_com_alias ("brea", "break", class_run, 1); if (xdb_commands) add_com_alias ("ba", "break", class_breakpoint, 1); if (dbx_commands) { add_abbrev_prefix_cmd ("stop", class_breakpoint, stop_command, _("\ Break in function/address or break at a line in the current file."), &stoplist, "stop ", 1, &cmdlist); add_cmd ("in", class_breakpoint, stopin_command, _("Break in function or address."), &stoplist); add_cmd ("at", class_breakpoint, stopat_command, _("Break at a line in the current file."), &stoplist); add_com ("status", class_info, breakpoints_info, _("\ Status of user-settable breakpoints, or breakpoint number NUMBER.\n\ The \"Type\" column indicates one of:\n\ \tbreakpoint - normal breakpoint\n\ \twatchpoint - watchpoint\n\ The \"Disp\" column contains one of \"keep\", \"del\", or \"dis\" to indicate\n\ the disposition of the breakpoint after it gets hit. \"dis\" means that the\n\ breakpoint will be disabled. The \"Address\" and \"What\" columns indicate the\n\ address and file/line number respectively.\n\ \n\ Convenience variable \"$_\" and default examine address for \"x\"\n\ are set to the address of the last breakpoint listed unless the command\n\ is prefixed with \"server \".\n\n\ Convenience variable \"$bpnum\" contains the number of the last\n\ breakpoint set.")); } add_info ("breakpoints", breakpoints_info, _("\ Status of user-settable breakpoints, or breakpoint number NUMBER.\n\ The \"Type\" column indicates one of:\n\ \tbreakpoint - normal breakpoint\n\ \twatchpoint - watchpoint\n\ The \"Disp\" column contains one of \"keep\", \"del\", or \"dis\" to indicate\n\ the disposition of the breakpoint after it gets hit. \"dis\" means that the\n\ breakpoint will be disabled. The \"Address\" and \"What\" columns indicate the\n\ address and file/line number respectively.\n\ \n\ Convenience variable \"$_\" and default examine address for \"x\"\n\ are set to the address of the last breakpoint listed unless the command\n\ is prefixed with \"server \".\n\n\ Convenience variable \"$bpnum\" contains the number of the last\n\ breakpoint set.")); add_info_alias ("b", "breakpoints", 1); if (xdb_commands) add_com ("lb", class_breakpoint, breakpoints_info, _("\ Status of user-settable breakpoints, or breakpoint number NUMBER.\n\ The \"Type\" column indicates one of:\n\ \tbreakpoint - normal breakpoint\n\ \twatchpoint - watchpoint\n\ The \"Disp\" column contains one of \"keep\", \"del\", or \"dis\" to indicate\n\ the disposition of the breakpoint after it gets hit. \"dis\" means that the\n\ breakpoint will be disabled. The \"Address\" and \"What\" columns indicate the\n\ address and file/line number respectively.\n\ \n\ Convenience variable \"$_\" and default examine address for \"x\"\n\ are set to the address of the last breakpoint listed unless the command\n\ is prefixed with \"server \".\n\n\ Convenience variable \"$bpnum\" contains the number of the last\n\ breakpoint set.")); add_cmd ("breakpoints", class_maintenance, maintenance_info_breakpoints, _("\ Status of all breakpoints, or breakpoint number NUMBER.\n\ The \"Type\" column indicates one of:\n\ \tbreakpoint - normal breakpoint\n\ \twatchpoint - watchpoint\n\ \tlongjmp - internal breakpoint used to step through longjmp()\n\ \tlongjmp resume - internal breakpoint at the target of longjmp()\n\ \tuntil - internal breakpoint used by the \"until\" command\n\ \tfinish - internal breakpoint used by the \"finish\" command\n\ The \"Disp\" column contains one of \"keep\", \"del\", or \"dis\" to indicate\n\ the disposition of the breakpoint after it gets hit. \"dis\" means that the\n\ breakpoint will be disabled. The \"Address\" and \"What\" columns indicate the\n\ address and file/line number respectively.\n\ \n\ Convenience variable \"$_\" and default examine address for \"x\"\n\ are set to the address of the last breakpoint listed unless the command\n\ is prefixed with \"server \".\n\n\ Convenience variable \"$bpnum\" contains the number of the last\n\ breakpoint set."), &maintenanceinfolist); add_prefix_cmd ("catch", class_breakpoint, catch_command, _("\ Set catchpoints to catch events."), &catch_cmdlist, "catch ", 0/*allow-unknown*/, &cmdlist); add_prefix_cmd ("tcatch", class_breakpoint, tcatch_command, _("\ Set temporary catchpoints to catch events."), &tcatch_cmdlist, "tcatch ", 0/*allow-unknown*/, &cmdlist); /* Add catch and tcatch sub-commands. */ add_catch_command ("catch", _("\ Catch an exception, when caught.\n\ With an argument, catch only exceptions with the given name."), catch_catch_command, NULL, CATCH_PERMANENT, CATCH_TEMPORARY); add_catch_command ("throw", _("\ Catch an exception, when thrown.\n\ With an argument, catch only exceptions with the given name."), catch_throw_command, NULL, CATCH_PERMANENT, CATCH_TEMPORARY); add_catch_command ("fork", _("Catch calls to fork."), catch_fork_command_1, NULL, (void *) (uintptr_t) catch_fork_permanent, (void *) (uintptr_t) catch_fork_temporary); add_catch_command ("vfork", _("Catch calls to vfork."), catch_fork_command_1, NULL, (void *) (uintptr_t) catch_vfork_permanent, (void *) (uintptr_t) catch_vfork_temporary); add_catch_command ("exec", _("Catch calls to exec."), catch_exec_command_1, NULL, CATCH_PERMANENT, CATCH_TEMPORARY); add_catch_command ("syscall", _("\ Catch system calls by their names and/or numbers.\n\ Arguments say which system calls to catch. If no arguments\n\ are given, every system call will be caught.\n\ Arguments, if given, should be one or more system call names\n\ (if your system supports that), or system call numbers."), catch_syscall_command_1, catch_syscall_completer, CATCH_PERMANENT, CATCH_TEMPORARY); add_catch_command ("exception", _("\ Catch Ada exceptions, when raised.\n\ With an argument, catch only exceptions with the given name."), catch_ada_exception_command, NULL, CATCH_PERMANENT, CATCH_TEMPORARY); add_catch_command ("assert", _("\ Catch failed Ada assertions, when raised.\n\ With an argument, catch only exceptions with the given name."), catch_assert_command, NULL, CATCH_PERMANENT, CATCH_TEMPORARY); c = add_com ("watch", class_breakpoint, watch_command, _("\ Set a watchpoint for an expression.\n\ A watchpoint stops execution of your program whenever the value of\n\ an expression changes.")); set_cmd_completer (c, expression_completer); c = add_com ("rwatch", class_breakpoint, rwatch_command, _("\ Set a read watchpoint for an expression.\n\ A watchpoint stops execution of your program whenever the value of\n\ an expression is read.")); set_cmd_completer (c, expression_completer); c = add_com ("awatch", class_breakpoint, awatch_command, _("\ Set a watchpoint for an expression.\n\ A watchpoint stops execution of your program whenever the value of\n\ an expression is either read or written.")); set_cmd_completer (c, expression_completer); add_info ("watchpoints", breakpoints_info, _("Synonym for ``info breakpoints''.")); /* XXX: cagney/2005-02-23: This should be a boolean, and should respond to changes - contrary to the description. */ add_setshow_zinteger_cmd ("can-use-hw-watchpoints", class_support, &can_use_hw_watchpoints, _("\ Set debugger's willingness to use watchpoint hardware."), _("\ Show debugger's willingness to use watchpoint hardware."), _("\ If zero, gdb will not use hardware for new watchpoints, even if\n\ such is available. (However, any hardware watchpoints that were\n\ created before setting this to nonzero, will continue to use watchpoint\n\ hardware.)"), NULL, show_can_use_hw_watchpoints, &setlist, &showlist); can_use_hw_watchpoints = 1; /* Tracepoint manipulation commands. */ c = add_com ("trace", class_breakpoint, trace_command, _("\ Set a tracepoint at specified line or function.\n\ \n" BREAK_ARGS_HELP ("trace") "\n\ Do \"help tracepoints\" for info on other tracepoint commands.")); set_cmd_completer (c, location_completer); add_com_alias ("tp", "trace", class_alias, 0); add_com_alias ("tr", "trace", class_alias, 1); add_com_alias ("tra", "trace", class_alias, 1); add_com_alias ("trac", "trace", class_alias, 1); c = add_com ("ftrace", class_breakpoint, ftrace_command, _("\ Set a fast tracepoint at specified line or function.\n\ \n" BREAK_ARGS_HELP ("ftrace") "\n\ Do \"help tracepoints\" for info on other tracepoint commands.")); set_cmd_completer (c, location_completer); add_info ("tracepoints", tracepoints_info, _("\ Status of tracepoints, or tracepoint number NUMBER.\n\ Convenience variable \"$tpnum\" contains the number of the\n\ last tracepoint set.")); add_info_alias ("tp", "tracepoints", 1); add_cmd ("tracepoints", class_trace, delete_trace_command, _("\ Delete specified tracepoints.\n\ Arguments are tracepoint numbers, separated by spaces.\n\ No argument means delete all tracepoints."), &deletelist); c = add_cmd ("tracepoints", class_trace, disable_trace_command, _("\ Disable specified tracepoints.\n\ Arguments are tracepoint numbers, separated by spaces.\n\ No argument means disable all tracepoints."), &disablelist); deprecate_cmd (c, "disable"); c = add_cmd ("tracepoints", class_trace, enable_trace_command, _("\ Enable specified tracepoints.\n\ Arguments are tracepoint numbers, separated by spaces.\n\ No argument means enable all tracepoints."), &enablelist); deprecate_cmd (c, "enable"); add_com ("passcount", class_trace, trace_pass_command, _("\ Set the passcount for a tracepoint.\n\ The trace will end when the tracepoint has been passed 'count' times.\n\ Usage: passcount COUNT TPNUM, where TPNUM may also be \"all\";\n\ if TPNUM is omitted, passcount refers to the last tracepoint defined.")); c = add_com ("save-tracepoints", class_trace, tracepoint_save_command, _("\ Save current tracepoint definitions as a script.\n\ Use the 'source' command in another debug session to restore them.")); set_cmd_completer (c, filename_completer); add_prefix_cmd ("breakpoint", class_maintenance, set_breakpoint_cmd, _("\ Breakpoint specific settings\n\ Configure various breakpoint-specific variables such as\n\ pending breakpoint behavior"), &breakpoint_set_cmdlist, "set breakpoint ", 0/*allow-unknown*/, &setlist); add_prefix_cmd ("breakpoint", class_maintenance, show_breakpoint_cmd, _("\ Breakpoint specific settings\n\ Configure various breakpoint-specific variables such as\n\ pending breakpoint behavior"), &breakpoint_show_cmdlist, "show breakpoint ", 0/*allow-unknown*/, &showlist); add_setshow_auto_boolean_cmd ("pending", no_class, &pending_break_support, _("\ Set debugger's behavior regarding pending breakpoints."), _("\ Show debugger's behavior regarding pending breakpoints."), _("\ If on, an unrecognized breakpoint location will cause gdb to create a\n\ pending breakpoint. If off, an unrecognized breakpoint location results in\n\ an error. If auto, an unrecognized breakpoint location results in a\n\ user-query to see if a pending breakpoint should be created."), NULL, show_pending_break_support, &breakpoint_set_cmdlist, &breakpoint_show_cmdlist); pending_break_support = AUTO_BOOLEAN_AUTO; add_setshow_boolean_cmd ("auto-hw", no_class, &automatic_hardware_breakpoints, _("\ Set automatic usage of hardware breakpoints."), _("\ Show automatic usage of hardware breakpoints."), _("\ If set, the debugger will automatically use hardware breakpoints for\n\ breakpoints set with \"break\" but falling in read-only memory. If not set,\n\ a warning will be emitted for such breakpoints."), NULL, show_automatic_hardware_breakpoints, &breakpoint_set_cmdlist, &breakpoint_show_cmdlist); add_setshow_enum_cmd ("always-inserted", class_support, always_inserted_enums, &always_inserted_mode, _("\ Set mode for inserting breakpoints."), _("\ Show mode for inserting breakpoints."), _("\ When this mode is off, breakpoints are inserted in inferior when it is\n\ resumed, and removed when execution stops. When this mode is on,\n\ breakpoints are inserted immediately and removed only when the user\n\ deletes the breakpoint. When this mode is auto (which is the default),\n\ the behaviour depends on the non-stop setting (see help set non-stop).\n\ In this case, if gdb is controlling the inferior in non-stop mode, gdb\n\ behaves as if always-inserted mode is on; if gdb is controlling the\n\ inferior in all-stop mode, gdb behaves as if always-inserted mode is off."), NULL, &show_always_inserted_mode, &breakpoint_set_cmdlist, &breakpoint_show_cmdlist); automatic_hardware_breakpoints = 1; observer_attach_about_to_proceed (breakpoint_about_to_proceed); }
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