/* 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 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 . */
#include "defs.h"
#include
#include "hashtab.h"
#include "symtab.h"
#include "frame.h"
#include "breakpoint.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 "gdb-events.h"
#include "mi/mi-common.h"
/* Prototypes for local functions. */
static void until_break_command_continuation (struct continuation_arg *arg);
static void catch_command_1 (char *, int, int);
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 *);
struct breakpoint *set_raw_breakpoint (struct symtab_and_line, enum bptype);
static void check_duplicates (struct breakpoint *);
static void breakpoint_adjustment_warning (CORE_ADDR, CORE_ADDR, int, int);
static CORE_ADDR adjust_breakpoint_address (CORE_ADDR bpaddr,
enum bptype bptype);
static void describe_other_breakpoints (CORE_ADDR, asection *, int);
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 enum print_stop_action print_it_typical (bpstat);
static enum print_stop_action print_bp_stop_message (bpstat bs);
typedef struct
{
enum exception_event_kind kind;
int enable_p;
}
args_for_catchpoint_enable;
static int watchpoint_check (void *);
static void maintenance_info_breakpoints (char *, int);
static void create_longjmp_breakpoint (char *);
static void create_overlay_event_breakpoint (char *);
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 create_fork_vfork_event_catchpoint (int tempflag,
char *cond_string,
enum bptype bp_kind);
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_find_event_name_end (char *arg);
static char *ep_parse_optional_if_clause (char **arg);
static char *ep_parse_optional_filename (char **arg);
static void create_exception_catchpoint (int tempflag, char *cond_string,
enum exception_event_kind ex_event,
struct symtab_and_line *sal);
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 (CORE_ADDR pc);
static void free_bp_location (struct bp_location *loc);
static void mark_breakpoints_out (void);
static struct bp_location *
allocate_bp_location (struct breakpoint *bpt, enum bptype bp_type);
static void
unlink_locations_from_global_list (struct breakpoint *bpt);
static int
is_hardware_watchpoint (struct breakpoint *bpt);
/* 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);
}
void _initialize_breakpoint (void);
extern int addressprint; /* Print machine addresses? */
/* 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 iterators for the low-level breakpoints. */
#define ALL_BP_LOCATIONS(B) for (B = bp_location_chain; B; B = B->global_next)
#define ALL_BP_LOCATIONS_SAFE(B,TMP) \
for (B = bp_location_chain; \
B ? (TMP=B->global_next, 1): 0; \
B = TMP)
/* True if breakpoint hit counts should be displayed in breakpoint info. */
int show_breakpoint_hit_counts = 1;
/* Chains of all breakpoints defined. */
struct breakpoint *breakpoint_chain;
struct bp_location *bp_location_chain;
/* Number of last breakpoint made. */
int breakpoint_count;
/* Pointer to current exception event record */
static struct exception_event_record *current_exception_event;
/* This function returns a pointer to the string representation of the
pathname of the dynamically-linked library that has just been
loaded.
This function must be used only when SOLIB_HAVE_LOAD_EVENT is TRUE,
or undefined results are guaranteed.
This string's contents are only valid immediately after the
inferior has stopped in the dynamic linker hook, and becomes
invalid as soon as the inferior is continued. Clients should make
a copy of this string if they wish to continue the inferior and
then access the string. */
#ifndef SOLIB_LOADED_LIBRARY_PATHNAME
#define SOLIB_LOADED_LIBRARY_PATHNAME(pid) ""
#endif
/* This function returns a pointer to the string representation of the
pathname of the dynamically-linked library that has just been
unloaded.
This function must be used only when SOLIB_HAVE_UNLOAD_EVENT is
TRUE, or undefined results are guaranteed.
This string's contents are only valid immediately after the
inferior has stopped in the dynamic linker hook, and becomes
invalid as soon as the inferior is continued. Clients should make
a copy of this string if they wish to continue the inferior and
then access the string. */
#ifndef SOLIB_UNLOADED_LIBRARY_PATHNAME
#define SOLIB_UNLOADED_LIBRARY_PATHNAME(pid) ""
#endif
/* This function is called by the "catch load" command. It allows the
debugger to be notified by the dynamic linker when a specified
library file (or any library file, if filename is NULL) is loaded. */
#ifndef SOLIB_CREATE_CATCH_LOAD_HOOK
#define SOLIB_CREATE_CATCH_LOAD_HOOK(pid,tempflag,filename,cond_string) \
error (_("catch of library loads not yet implemented on this platform"))
#endif
/* This function is called by the "catch unload" command. It allows
the debugger to be notified by the dynamic linker when a specified
library file (or any library file, if filename is NULL) is
unloaded. */
#ifndef SOLIB_CREATE_CATCH_UNLOAD_HOOK
#define SOLIB_CREATE_CATCH_UNLOAD_HOOK(pid, tempflag, filename, cond_string) \
error (_("catch of library unloads not yet implemented on this platform"))
#endif
/* 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 (lookup_internalvar ("bpnum"),
value_from_longest (builtin_type_int, (LONGEST) 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;
}
/* 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;
/* *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;
struct value *val;
while (isalnum (*p) || *p == '_')
p++;
varname = (char *) alloca (p - start + 1);
strncpy (varname, start, p - start);
varname[p - start] = '\0';
val = value_of_internalvar (lookup_internalvar (varname));
if (TYPE_CODE (value_type (val)) == TYPE_CODE_INT)
retval = (int) value_as_long (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 - , 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 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 .
*/
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 ( - ).
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;
}
/* 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 = savestring (arg, strlen (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 ();
breakpoint_modify_event (b->number);
return;
}
error (_("No breakpoint number %d."), bnum);
}
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);
do_cleanups (cleanups);
free_command_lines (&b->commands);
b->commands = l;
breakpoints_changed ();
breakpoint_modify_event (b->number);
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 ();
breakpoint_modify_event (b->number);
return simple_control;
}
error (_("No breakpoint number %d."), bnum);
}
/* Like target_read_memory() but if breakpoints are inserted, return
the shadow contents instead of the breakpoints themselves.
Read "memory data" from whatever target or inferior we have.
Returns zero if successful, errno value if not. EIO is used
for address out of bounds. If breakpoints are inserted, returns
shadow contents, not the breakpoints themselves. From breakpoint.c. */
int
read_memory_nobpt (CORE_ADDR memaddr, gdb_byte *myaddr, unsigned len)
{
int status;
const struct bp_location *b;
CORE_ADDR bp_addr = 0;
int bp_size = 0;
if (gdbarch_breakpoint_from_pc (current_gdbarch, &bp_addr, &bp_size) == NULL)
/* No breakpoints on this machine. */
return target_read_memory (memaddr, myaddr, len);
ALL_BP_LOCATIONS (b)
{
if (b->owner->type == bp_none)
warning (_("reading through apparently deleted breakpoint #%d?"),
b->owner->number);
if (b->loc_type != bp_loc_software_breakpoint)
continue;
if (!b->inserted)
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_size == 0)
/* bp isn't valid, or doesn't shadow memory. */
continue;
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;
/* Copy the breakpoint from the shadow contents, and recurse for
the things before and after. */
{
/* Offset within shadow_contents. */
int bptoffset = 0;
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 (myaddr + bp_addr - memaddr,
b->target_info.shadow_contents + bptoffset, bp_size);
if (bp_addr > memaddr)
{
/* Copy the section of memory before the breakpoint. */
status = read_memory_nobpt (memaddr, myaddr, bp_addr - memaddr);
if (status != 0)
return status;
}
if (bp_addr + bp_size < memaddr + len)
{
/* Copy the section of memory after the breakpoint. */
status = read_memory_nobpt (bp_addr + bp_size,
myaddr + bp_addr + bp_size - memaddr,
memaddr + len - (bp_addr + bp_size));
if (status != 0)
return status;
}
return 0;
}
}
/* Nothing overlaps. Just call read_memory_noerr. */
return target_read_memory (memaddr, myaddr, len);
}
/* 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;
switch (b->type)
{
case bp_catch_fork:
target_insert_fork_catchpoint (PIDGET (inferior_ptid));
break;
case bp_catch_vfork:
target_insert_vfork_catchpoint (PIDGET (inferior_ptid));
break;
case bp_catch_exec:
target_insert_exec_catchpoint (PIDGET (inferior_ptid));
break;
default:
internal_error (__FILE__, __LINE__, _("unknown breakpoint type"));
break;
}
}
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 an 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;
*valp = NULL;
if (resultp)
*resultp = NULL;
if (val_chain)
*val_chain = NULL;
/* Evaluate the expression. */
mark = value_mark ();
result = NULL;
gdb_evaluate_expression (exp, &result);
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 hardware watchpoint:
- Reparse watchpoint expression, is REPARSE is non-zero
- Evaluate expression and store the result in B->val
- Update the list of values that must be watched in B->loc.
If the watchpoint is disabled, do nothing. If this is
local watchpoint that is out of scope, delete it. */
static void
update_watchpoint (struct breakpoint *b, int reparse)
{
int within_current_scope;
struct frame_id saved_frame_id;
struct bp_location *loc;
bpstat bs;
unlink_locations_from_global_list (b);
for (loc = b->loc; loc;)
{
struct bp_location *loc_next = loc->next;
remove_breakpoint (loc, mark_uninserted);
xfree (loc);
loc = loc_next;
}
b->loc = NULL;
if (b->disposition == disp_del_at_next_stop)
return;
/* 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. */
saved_frame_id = get_frame_id (get_selected_frame (NULL));
/* Determine if the watchpoint is within scope. */
if (b->exp_valid_block == NULL)
within_current_scope = 1;
else
{
struct frame_info *fi;
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 (within_current_scope && b->exp)
{
struct value *val_chain, *v, *result, *next;
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;
}
/* 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) + value_offset (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, bp_hardware_watchpoint);
for (tmp = &(b->loc); *tmp != NULL; tmp = &((*tmp)->next))
;
*tmp = loc;
loc->address = addr;
loc->length = len;
loc->watchpoint_type = type;
}
}
next = value_next (v);
if (v != b->val)
value_free (v);
}
if (reparse && b->cond_string != NULL)
{
char *s = b->cond_string;
if (b->loc->cond)
{
xfree (b->loc->cond);
b->loc->cond = NULL;
}
b->loc->cond = parse_exp_1 (&s, b->exp_valid_block, 0);
}
}
else if (!within_current_scope)
{
printf_filtered (_("\
Hardware 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. */
select_frame (frame_find_by_id (saved_frame_id));
}
/* Insert a low-level "breakpoint" of some type. BPT is the breakpoint.
Any error messages are printed to TMP_ERROR_STREAM; and DISABLED_BREAKS,
PROCESS_WARNING, 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 *process_warning,
int *hw_breakpoint_error)
{
int val = 0;
if (!breakpoint_enabled (bpt->owner))
return 0;
if (!bpt->enabled || bpt->shlib_disabled || bpt->inserted || bpt->duplicate)
return 0;
/* Initialize the target-specific information. */
memset (&bpt->target_info, 0, sizeof (bpt->target_info));
bpt->target_info.placed_address = bpt->address;
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"),
paddr (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->target_info);
else
val = target_insert_breakpoint (&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->overlay_target_info);
if (val != 0)
fprintf_unfiltered (tmp_error_stream,
"Overlay breakpoint %d failed: in ROM?",
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->target_info);
else
val = target_insert_breakpoint (&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_address (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
{
#ifdef ONE_PROCESS_WRITETEXT
*process_warning = 1;
#endif
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->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_catch_fork
|| bpt->owner->type == bp_catch_vfork
|| bpt->owner->type == bp_catch_exec)
{
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;
}
/* 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. */
void
insert_breakpoints (void)
{
struct breakpoint *bpt;
struct bp_location *b, *temp;
int error = 0;
int val = 0;
int disabled_breaks = 0;
int hw_breakpoint_error = 0;
int process_warning = 0;
struct ui_file *tmp_error_stream = mem_fileopen ();
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");
ALL_BREAKPOINTS (bpt)
if (is_hardware_watchpoint (bpt))
update_watchpoint (bpt, 0 /* don't reparse */);
ALL_BP_LOCATIONS_SAFE (b, temp)
{
if (!breakpoint_enabled (b->owner))
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;
val = insert_bp_location (b, tmp_error_stream,
&disabled_breaks, &process_warning,
&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 (bpt->enable_state != bp_enabled)
continue;
for (loc = bpt->loc; loc; loc = loc->next)
if (!loc->inserted)
{
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");
}
#ifdef ONE_PROCESS_WRITETEXT
if (process_warning)
fprintf_unfiltered (tmp_error_stream,
"The same program may be running in another process.");
#endif
target_terminal_ours_for_output ();
error_stream (tmp_error_stream);
}
}
int
remove_breakpoints (void)
{
struct bp_location *b;
int val;
ALL_BP_LOCATIONS (b)
{
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;
int val;
ALL_BP_LOCATIONS (b)
{
if (b->inserted && b->loc_type == bp_loc_hardware_watchpoint)
{
val = remove_breakpoint (b, mark_uninserted);
if (val != 0)
return val;
}
}
return 0;
}
int
reattach_breakpoints (int pid)
{
struct bp_location *b;
int val;
struct cleanup *old_chain = save_inferior_ptid ();
struct ui_file *tmp_error_stream = mem_fileopen ();
int dummy1 = 0, dummy2 = 0, dummy3 = 0;
make_cleanup_ui_file_delete (tmp_error_stream);
inferior_ptid = pid_to_ptid (pid);
ALL_BP_LOCATIONS (b)
{
if (b->inserted)
{
b->inserted = 0;
val = insert_bp_location (b, tmp_error_stream,
&dummy1, &dummy2, &dummy3);
if (val != 0)
{
do_cleanups (old_chain);
return val;
}
}
}
do_cleanups (old_chain);
return 0;
}
void
update_breakpoints_after_exec (void)
{
struct breakpoint *b;
struct breakpoint *temp;
/* Doing this first prevents the badness of having delete_breakpoint()
write a breakpoint's current "shadow contents" to lift the bp. That
shadow is NOT valid after an exec()! */
mark_breakpoints_out ();
ALL_BREAKPOINTS_SAFE (b, temp)
{
/* Solib breakpoints must be explicitly reset after an exec(). */
if (b->type == bp_shlib_event)
{
delete_breakpoint (b);
continue;
}
/* Thread event breakpoints must be set anew after an exec(),
as must overlay event breakpoints. */
if (b->type == bp_thread_event || b->type == bp_overlay_event)
{
delete_breakpoint (b);
continue;
}
/* Step-resume breakpoints are meaningless after an exec(). */
if (b->type == bp_step_resume)
{
delete_breakpoint (b);
continue;
}
/* Don't delete an exec catchpoint, because else the inferior
won't stop when it ought!
Similarly, we probably ought to keep vfork catchpoints, 'cause
on this target, we may not be able to stop when the vfork is
seen, but only when the subsequent exec is seen. (And because
deleting fork catchpoints here but not vfork catchpoints will
seem mysterious to users, keep those too.) */
if ((b->type == bp_catch_exec) ||
(b->type == bp_catch_vfork) ||
(b->type == bp_catch_fork))
{
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");
}
int
detach_breakpoints (int pid)
{
struct bp_location *b;
int val;
struct cleanup *old_chain = save_inferior_ptid ();
if (pid == PIDGET (inferior_ptid))
error (_("Cannot detach breakpoints of inferior_ptid"));
/* Set inferior_ptid; remove_breakpoint uses this global. */
inferior_ptid = pid_to_ptid (pid);
ALL_BP_LOCATIONS (b)
{
if (b->inserted)
{
val = remove_breakpoint (b, mark_inserted);
if (val != 0)
{
do_cleanups (old_chain);
return val;
}
}
}
do_cleanups (old_chain);
return 0;
}
static int
remove_breakpoint (struct bp_location *b, insertion_state_t is)
{
int val;
if (b->owner->enable_state == bp_permanent)
/* Permanent breakpoints cannot be inserted or removed. */
return 0;
if (b->owner->type == bp_none)
warning (_("attempted to remove apparently deleted breakpoint #%d?"),
b->owner->number);
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->target_info);
else
val = target_remove_breakpoint (&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->overlay_target_info);
else
target_remove_breakpoint (&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->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->target_info);
else
val = 0;
}
else
{
/* No -- not inserted, so no need to remove. No error. */
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_catch_fork ||
b->owner->type == bp_catch_vfork ||
b->owner->type == bp_catch_exec)
&& breakpoint_enabled (b->owner)
&& !b->duplicate)
{
val = -1;
switch (b->owner->type)
{
case bp_catch_fork:
val = target_remove_fork_catchpoint (PIDGET (inferior_ptid));
break;
case bp_catch_vfork:
val = target_remove_vfork_catchpoint (PIDGET (inferior_ptid));
break;
case bp_catch_exec:
val = target_remove_exec_catchpoint (PIDGET (inferior_ptid));
break;
default:
warning (_("Internal error, %s line %d."), __FILE__, __LINE__);
break;
}
if (val)
return val;
b->inserted = (is == mark_inserted);
}
return 0;
}
/* Clear the "inserted" flag in all breakpoints. */
static void
mark_breakpoints_out (void)
{
struct bp_location *bpt;
ALL_BP_LOCATIONS (bpt)
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;
ALL_BP_LOCATIONS (bpt)
bpt->inserted = 0;
ALL_BREAKPOINTS_SAFE (b, temp)
{
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;
}
}
}
/* 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 (CORE_ADDR pc)
{
const struct bp_location *bpt;
int any_breakpoint_here = 0;
ALL_BP_LOCATIONS (bpt)
{
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)
&& bpt->address == pc) /* bp is enabled and matches 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;
}
/* Returns non-zero if there's a breakpoint inserted at PC, which is
inserted using regular breakpoint_chain/bp_location_chain mechanism.
This does not check for single-step breakpoints, which are
inserted and removed using direct target manipulation. */
int
regular_breakpoint_inserted_here_p (CORE_ADDR pc)
{
const struct bp_location *bpt;
ALL_BP_LOCATIONS (bpt)
{
if (bpt->loc_type != bp_loc_software_breakpoint
&& bpt->loc_type != bp_loc_hardware_breakpoint)
continue;
if (bpt->inserted
&& bpt->address == pc) /* bp is inserted and matches 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 (CORE_ADDR pc)
{
if (regular_breakpoint_inserted_here_p (pc))
return 1;
if (single_step_breakpoint_inserted_here_p (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 (CORE_ADDR pc)
{
const struct bp_location *bpt;
int any_breakpoint_here = 0;
ALL_BP_LOCATIONS (bpt)
{
if (bpt->loc_type != bp_loc_software_breakpoint)
continue;
if (bpt->inserted
&& bpt->address == pc) /* bp is enabled and matches 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 (pc))
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 (CORE_ADDR pc, ptid_t ptid)
{
const struct bp_location *bpt;
int thread;
thread = pid_to_thread_id (ptid);
ALL_BP_LOCATIONS (bpt)
{
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)
&& bpt->address == pc
&& (bpt->owner->thread == -1 || bpt->owner->thread == thread))
{
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;
}
/* bpstat stuff. External routines' interfaces are documented
in breakpoint.h. */
int
ep_is_catchpoint (struct breakpoint *ep)
{
return
(ep->type == bp_catch_load)
|| (ep->type == bp_catch_unload)
|| (ep->type == bp_catch_fork)
|| (ep->type == bp_catch_vfork)
|| (ep->type == bp_catch_exec);
/* ??rehrauer: Add more kinds here, as are implemented... */
}
int
ep_is_shlib_catchpoint (struct breakpoint *ep)
{
return
(ep->type == bp_catch_load)
|| (ep->type == bp_catch_unload);
}
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);
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;
}
}
}
/* 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. */
void
bpstat_do_actions (bpstat *bsp)
{
bpstat bs;
struct cleanup *old_chain;
/* Avoid endless recursion if a `source' command is contained
in bs->commands. */
if (executing_breakpoint_commands)
return;
executing_breakpoint_commands = 1;
old_chain = make_cleanup (cleanup_executing_breakpoints, 0);
top:
/* Note that (as of this writing), our callers all appear to
be passing us the address of global stop_bpstat. And, if
our calls to execute_control_command cause the inferior to
proceed, that global (and hence, *bsp) will change.
We must be careful to not touch *bsp unless the inferior
has not proceeded. */
/* 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)
/* The inferior is proceeded by the command; bomb out now.
The bpstat chain has been blown away by wait_for_inferior.
But since execution has stopped again, there is a new bpstat
to look at, so start over. */
goto top;
}
do_cleanups (old_chain);
}
/* 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, _(""));
else
value_print (val, stream, 0, Val_pretty_default);
}
/* 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, *ui_out_chain;
struct breakpoint *b;
const struct bp_location *bl;
struct ui_stream *stb;
stb = ui_out_stream_new (uiout);
old_chain = make_cleanup_ui_out_stream_delete (stb);
/* 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;
switch (b->type)
{
case bp_breakpoint:
case bp_hardware_breakpoint:
if (bl->address != bl->requested_address)
breakpoint_adjustment_warning (bl->requested_address,
bl->address,
b->number, 1);
annotate_breakpoint (b->number);
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_int (uiout, "bkptno", b->number);
ui_out_text (uiout, ", ");
return 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"));
return 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"));
return 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"));
return PRINT_NOTHING;
break;
case bp_catch_load:
annotate_catchpoint (b->number);
printf_filtered (_("\nCatchpoint %d (loaded %s), "),
b->number,
b->triggered_dll_pathname);
return PRINT_SRC_AND_LOC;
break;
case bp_catch_unload:
annotate_catchpoint (b->number);
printf_filtered (_("\nCatchpoint %d (unloaded %s), "),
b->number,
b->triggered_dll_pathname);
return PRINT_SRC_AND_LOC;
break;
case bp_catch_fork:
annotate_catchpoint (b->number);
printf_filtered (_("\nCatchpoint %d (forked process %d), "),
b->number,
b->forked_inferior_pid);
return PRINT_SRC_AND_LOC;
break;
case bp_catch_vfork:
annotate_catchpoint (b->number);
printf_filtered (_("\nCatchpoint %d (vforked process %d), "),
b->number,
b->forked_inferior_pid);
return PRINT_SRC_AND_LOC;
break;
case bp_catch_exec:
annotate_catchpoint (b->number);
printf_filtered (_("\nCatchpoint %d (exec'd %s), "),
b->number,
b->exec_pathname);
return PRINT_SRC_AND_LOC;
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);
ui_out_chain = 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);
do_cleanups (ui_out_chain);
ui_out_text (uiout, "\n");
/* More than one watchpoint may have been triggered. */
return 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);
ui_out_chain = 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);
do_cleanups (ui_out_chain);
ui_out_text (uiout, "\n");
return 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);
ui_out_chain = 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));
ui_out_chain = 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);
do_cleanups (ui_out_chain);
ui_out_text (uiout, "\n");
return 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));
return 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));
return 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:
default:
return PRINT_UNKNOWN;
}
}
/* 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 = STOPPED_BY_WATCHPOINT (*ws);
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 (addr >= loc->address
&& 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
/* Check watchpoint condition. */
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 (b->exp_valid_block == NULL)
within_current_scope = 1;
else
{
/* There is no current frame at this moment. If we're going to have
any chance of handling watchpoints on local variables, we'll need
the frame chain (so we can determine if we're in scope). */
reinit_frame_cache ();
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
&& block_function (b->exp_valid_block) != get_frame_function (fr))
within_current_scope = 0;
/* 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.
vinschen/2003-09-04: The former implementation left out the case
that the watchpoint frame couldn't be found by frame_find_by_id()
because the current PC is currently in an epilogue. Calling
gdbarch_in_function_epilogue_p() also when fr == NULL fixes that. */
if ((!within_current_scope || fr == get_current_frame ())
&& gdbarch_in_function_epilogue_p (current_gdbarch, read_pc ()))
return WP_VALUE_NOT_CHANGED;
if (fr && 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);
if ((b->val != NULL) != (new_val != NULL)
|| (b->val != NULL && !value_equal (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;
}
}
/* 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 (CORE_ADDR bp_addr, ptid_t ptid)
{
struct breakpoint *b = NULL;
const struct bp_location *bl;
/* 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 thread_id = pid_to_thread_id (ptid);
ALL_BP_LOCATIONS (bl)
{
b = bl->owner;
gdb_assert (b);
if (!breakpoint_enabled (b) && b->enable_state != bp_permanent)
continue;
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_catch_fork
&& b->type != bp_catch_vfork
&& b->type != bp_catch_exec) /* a non-watchpoint bp */
{
if (bl->address != bp_addr) /* address doesn't match */
continue;
if (overlay_debugging /* unmapped overlay section */
&& section_is_overlay (bl->section)
&& !section_is_mapped (bl->section))
continue;
}
/* 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)
continue;
if (b->type == bp_hardware_breakpoint)
{
if (bl->address != bp_addr)
continue;
if (overlay_debugging /* unmapped overlay section */
&& section_is_overlay (bl->section)
&& !section_is_mapped (bl->section))
continue;
}
/* Is this a catchpoint of a load or unload? If so, did we
get a load or unload of the specified library? If not,
ignore it. */
if ((b->type == bp_catch_load)
#if defined(SOLIB_HAVE_LOAD_EVENT)
&& (!SOLIB_HAVE_LOAD_EVENT (PIDGET (inferior_ptid))
|| ((b->dll_pathname != NULL)
&& (strcmp (b->dll_pathname,
SOLIB_LOADED_LIBRARY_PATHNAME (
PIDGET (inferior_ptid)))
!= 0)))
#endif
)
continue;
if ((b->type == bp_catch_unload)
#if defined(SOLIB_HAVE_UNLOAD_EVENT)
&& (!SOLIB_HAVE_UNLOAD_EVENT (PIDGET (inferior_ptid))
|| ((b->dll_pathname != NULL)
&& (strcmp (b->dll_pathname,
SOLIB_UNLOADED_LIBRARY_PATHNAME (
PIDGET (inferior_ptid)))
!= 0)))
#endif
)
continue;
if ((b->type == bp_catch_fork)
&& !inferior_has_forked (PIDGET (inferior_ptid),
&b->forked_inferior_pid))
continue;
if ((b->type == bp_catch_vfork)
&& !inferior_has_vforked (PIDGET (inferior_ptid),
&b->forked_inferior_pid))
continue;
if ((b->type == bp_catch_exec)
&& !inferior_has_execd (PIDGET (inferior_ptid), &b->exec_pathname))
continue;
/* 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
alrea
*/
if (b->type == bp_hardware_watchpoint && bl != b->loc)
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 */
/* Watchpoints may change this, if not found to have triggered. */
bs->stop = 1;
bs->print = 1;
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;
continue;
}
++(b->hit_count);
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;
continue;
}
/* Stop. */
++(b->hit_count);
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;
continue;
}
}
else
{
/* By definition, an encountered breakpoint is a triggered
breakpoint. */
++(b->hit_count);
}
if (frame_id_p (b->frame_id)
&& !frame_id_eq (b->frame_id, get_frame_id (get_current_frame ())))
bs->stop = 0;
else
{
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)
{
/* Need to select the frame, with all that implies
so that the conditions will have the right context. */
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 # */
free_all_values ();
}
if (bl->cond && value_is_zero)
{
bs->stop = 0;
/* Don't consider this a hit. */
--(b->hit_count);
}
else if (b->thread != -1 && b->thread != thread_id)
{
bs->stop = 0;
/* Don't consider this a hit. */
--(b->hit_count);
}
else if (b->ignore_count > 0)
{
b->ignore_count--;
annotate_ignore_count_change ();
bs->stop = 0;
}
else if (b->type == bp_thread_event || b->type == bp_overlay_event)
/* We do not stop for these. */
bs->stop = 0;
else
{
/* We will stop here */
if (b->disposition == disp_disable)
b->enable_state = bp_disabled;
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 if we dont print. */
if (bs->stop == 0 || bs->print == 0)
bs->print_it = print_it_noop;
}
bs->next = NULL; /* Terminate the chain */
bs = root_bs->next; /* Re-grab the head of 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;
if (bs == NULL)
for (bs = root_bs->next; bs != NULL; bs = bs->next)
if (!bs->stop
&& (bs->breakpoint_at->owner->type == bp_hardware_watchpoint
|| bs->breakpoint_at->owner->type == bp_read_watchpoint
|| bs->breakpoint_at->owner->type == bp_access_watchpoint))
{
/* remove/insert can invalidate bs->breakpoint_at, if this
location is no longer used by the watchpoint. Prevent
further code from trying to use it. */
bs->breakpoint_at = NULL;
remove_breakpoints ();
insert_breakpoints ();
break;
}
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 caught a shared library event. */
catch_shlib_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 clrs BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE
#define sr BPSTAT_WHAT_STEP_RESUME
#define shl BPSTAT_WHAT_CHECK_SHLIBS
#define shlr BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK
/* "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 < clr sgl shl shlr slr sn sr ss
sgl < clrs shl shlr slr sn sr ss
slr < err shl shlr sn sr ss
clr < clrs err shl shlr sn sr ss
clrs < err shl shlr sn sr ss
ss < shl shlr sn sr
sn < shl shlr sr
shl < shlr sr
shlr < 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, and the CLEAR_LONGJMP_RESUME/
CLEAR_LONGJMP_RESUME_SINGLE distinction (which breakpoint.h says
is messy anyway). */
/* 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 clrs sr shl shlr
*/
/*no_effect */
{kc, ss, sn, sgl, slr, clr, clrs, sr, shl, shlr},
/*wp_silent */
{ss, ss, sn, ss, ss, ss, ss, sr, shl, shlr},
/*wp_noisy */
{sn, sn, sn, sn, sn, sn, sn, sr, shl, shlr},
/*bp_nostop */
{sgl, ss, sn, sgl, slr, clrs, clrs, sr, shl, shlr},
/*bp_silent */
{ss, ss, sn, ss, ss, ss, ss, sr, shl, shlr},
/*bp_noisy */
{sn, sn, sn, sn, sn, sn, sn, sr, shl, shlr},
/*long_jump */
{slr, ss, sn, slr, slr, err, err, sr, shl, shlr},
/*long_resume */
{clr, ss, sn, clrs, err, err, err, sr, shl, shlr},
/*step_resume */
{sr, sr, sr, sr, sr, sr, sr, sr, sr, sr},
/*shlib */
{shl, shl, shl, shl, shl, shl, shl, sr, shl, shlr},
/*catch_shlib */
{shlr, shlr, shlr, shlr, shlr, shlr, shlr, sr, shlr, shlr}
};
#undef kc
#undef ss
#undef sn
#undef sgl
#undef slr
#undef clr
#undef clrs
#undef err
#undef sr
#undef ts
#undef shl
#undef shlr
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;
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_thread_event:
case bp_overlay_event:
bs_class = bp_nostop;
break;
case bp_catch_load:
case bp_catch_unload:
/* Only if this catchpoint triggered should we cause the
step-out-of-dld behaviour. Otherwise, we ignore this
catchpoint. */
if (bs->stop)
bs_class = catch_shlib_event;
else
bs_class = no_effect;
break;
case bp_catch_fork:
case bp_catch_vfork:
case bp_catch_exec:
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;
}
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)
return 1;
return 0;
}
/* Given a bpstat that records zero or more triggered eventpoints, this
function returns another bpstat which contains only the catchpoints
on that first list, if any. */
void
bpstat_get_triggered_catchpoints (bpstat ep_list, bpstat *cp_list)
{
struct bpstats root_bs[1];
bpstat bs = root_bs;
struct breakpoint *ep;
char *dll_pathname;
bpstat_clear (cp_list);
root_bs->next = NULL;
for (; ep_list != NULL; ep_list = ep_list->next)
{
/* Is this eventpoint a catchpoint? If not, ignore it. */
ep = ep_list->breakpoint_at->owner;
if (ep == NULL)
break;
if ((ep->type != bp_catch_load) &&
(ep->type != bp_catch_unload))
/* pai: (temp) ADD fork/vfork here!! */
continue;
/* Yes; add it to the list. */
bs = bpstat_alloc (ep_list->breakpoint_at, bs);
*bs = *ep_list;
bs->next = NULL;
bs = root_bs->next;
#if defined(SOLIB_ADD)
/* Also, for each triggered catchpoint, tag it with the name of
the library that caused this trigger. (We copy the name now,
because it's only guaranteed to be available NOW, when the
catchpoint triggers. Clients who may wish to know the name
later must get it from the catchpoint itself.) */
if (ep->triggered_dll_pathname != NULL)
xfree (ep->triggered_dll_pathname);
if (ep->type == bp_catch_load)
dll_pathname = SOLIB_LOADED_LIBRARY_PATHNAME (
PIDGET (inferior_ptid));
else
dll_pathname = SOLIB_UNLOADED_LIBRARY_PATHNAME (
PIDGET (inferior_ptid));
#else
dll_pathname = NULL;
#endif
if (dll_pathname)
{
ep->triggered_dll_pathname = (char *)
xmalloc (strlen (dll_pathname) + 1);
strcpy (ep->triggered_dll_pathname, dll_pathname);
}
else
ep->triggered_dll_pathname = NULL;
}
*cp_list = bs;
}
static void print_breakpoint_location (struct breakpoint *b,
struct bp_location *loc,
char *wrap_indent,
struct ui_stream *stb)
{
if (b->source_file)
{
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 (!b->loc)
{
ui_out_field_string (uiout, "pending", b->addr_string);
}
else
{
print_address_symbolic (loc->address, stb->stream, demangle, "");
ui_out_field_stream (uiout, "at", stb);
}
}
/* Print B to gdb_stdout. */
static void
print_one_breakpoint_location (struct breakpoint *b,
struct bp_location *loc,
int loc_number,
CORE_ADDR *last_addr)
{
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_catch_load, "catch load"},
{bp_catch_unload, "catch unload"},
{bp_catch_fork, "catch fork"},
{bp_catch_vfork, "catch vfork"},
{bp_catch_exec, "catch exec"}
};
static char *bpdisps[] =
{"del", "dstp", "dis", "keep"};
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);
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", bpdisps[(int) 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 (addressprint)
{
if (gdbarch_addr_bit (current_gdbarch) <= 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_addr);
}
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 (addressprint)
ui_out_field_skip (uiout, "addr");
annotate_field (5);
print_expression (b->exp, stb->stream);
ui_out_field_stream (uiout, "what", stb);
break;
case bp_catch_load:
case bp_catch_unload:
/* 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 (addressprint)
ui_out_field_skip (uiout, "addr");
annotate_field (5);
if (b->dll_pathname == NULL)
{
ui_out_field_string (uiout, "what", "");
ui_out_spaces (uiout, 1);
}
else
{
ui_out_text (uiout, "library \"");
ui_out_field_string (uiout, "what", b->dll_pathname);
ui_out_text (uiout, "\" ");
}
break;
case bp_catch_fork:
case bp_catch_vfork:
/* 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 (addressprint)
ui_out_field_skip (uiout, "addr");
annotate_field (5);
if (b->forked_inferior_pid != 0)
{
ui_out_text (uiout, "process ");
ui_out_field_int (uiout, "what", b->forked_inferior_pid);
ui_out_spaces (uiout, 1);
}
break;
case bp_catch_exec:
/* 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 (addressprint)
ui_out_field_skip (uiout, "addr");
annotate_field (5);
if (b->exec_pathname != NULL)
{
ui_out_text (uiout, "program \"");
ui_out_field_string (uiout, "what", b->exec_pathname);
ui_out_text (uiout, "\" ");
}
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:
if (addressprint)
{
annotate_field (4);
if (header_of_multiple)
ui_out_field_string (uiout, "addr", "");
if (b->loc == NULL || loc->shlib_disabled)
ui_out_field_string (uiout, "addr", "");
else
ui_out_field_core_addr (uiout, "addr", loc->address);
}
annotate_field (5);
if (!header_of_multiple)
print_breakpoint_location (b, loc, wrap_indent, stb);
if (b->loc)
*last_addr = b->loc->address;
break;
}
if (!part_of_multiple && 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);
}
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->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);
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 && show_breakpoint_hit_counts && 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 && show_breakpoint_hit_counts && 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");
}
if (!part_of_multiple && (l = b->commands))
{
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);
}
do_cleanups (bkpt_chain);
do_cleanups (old_chain);
}
static void
print_one_breakpoint (struct breakpoint *b,
CORE_ADDR *last_addr)
{
print_one_breakpoint_location (b, NULL, 0, last_addr);
/* 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_addr);
}
}
}
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;
CORE_ADDR dummy_addr = 0;
ALL_BREAKPOINTS (b)
{
if (args->bnum == b->number)
{
print_one_breakpoint (b, &dummy_addr);
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_catch_load
|| b->type == bp_catch_unload
|| b->type == bp_catch_fork
|| b->type == bp_catch_vfork
|| b->type == bp_catch_exec
|| b->type == bp_hardware_breakpoint
|| 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;
CORE_ADDR last_addr = (CORE_ADDR) -1;
int nr_printable_breakpoints;
struct cleanup *bkpttbl_chain;
/* Compute the number of rows in the table. */
nr_printable_breakpoints = 0;
ALL_BREAKPOINTS (b)
if (bnum == -1
|| bnum == b->number)
{
if (allflag || user_settable_breakpoint (b))
nr_printable_breakpoints++;
}
if (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 (addressprint)
{
if (nr_printable_breakpoints > 0)
annotate_field (4);
if (gdbarch_addr_bit (current_gdbarch) <= 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_addr);
}
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
{
/* Compare against (CORE_ADDR)-1 in case some compiler decides
that a comparison of an unsigned with -1 is always false. */
if (last_addr != (CORE_ADDR) -1 && !server_command)
set_next_address (last_addr);
}
/* 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, CORE_ADDR pc, asection *section)
{
struct bp_location *bl = b->loc;
for (; bl; bl = bl->next)
{
if (bl->address == pc
&& (!overlay_debugging || bl->section == section))
return 1;
}
return 0;
}
/* Print a message describing any breakpoints set at PC. */
static void
describe_other_breakpoints (CORE_ADDR pc, asection *section, int thread)
{
int others = 0;
struct breakpoint *b;
ALL_BREAKPOINTS (b)
others += breakpoint_has_pc (b, 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, 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)
? " (disabled)"
: b->enable_state == bp_permanent
? " (permanent)"
: ""),
(others > 1) ? ","
: ((others == 1) ? " and" : ""));
}
printf_filtered (_("also set at pc "));
fputs_filtered (paddress (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, CORE_ADDR addr, struct symtab *symtab,
int line)
{
default_breakpoint_valid = valid;
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 check_duplicates() to mark
breakpoints of any of these types to be a duplicate of an actual
breakpoint at address zero:
bp_watchpoint
bp_hardware_watchpoint
bp_read_watchpoint
bp_access_watchpoint
bp_catch_exec
bp_longjmp_resume
bp_catch_fork
bp_catch_vork */
static int
breakpoint_address_is_meaningful (struct breakpoint *bpt)
{
enum bptype type = bpt->type;
return (type != bp_watchpoint
&& type != bp_hardware_watchpoint
&& type != bp_read_watchpoint
&& type != bp_access_watchpoint
&& type != bp_catch_exec
&& type != bp_longjmp_resume
&& type != bp_catch_fork
&& type != bp_catch_vfork);
}
/* Rescan breakpoints at the same address and section as BPT,
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. */
static void
check_duplicates_for (CORE_ADDR address, asection *section)
{
struct bp_location *b;
int count = 0;
struct bp_location *perm_bp = 0;
ALL_BP_LOCATIONS (b)
if (b->owner->enable_state != bp_disabled
&& b->owner->enable_state != bp_call_disabled
&& b->enabled
&& !b->shlib_disabled
&& b->address == address /* address / overlay match */
&& (!overlay_debugging || b->section == section)
&& breakpoint_address_is_meaningful (b->owner))
{
/* Have we found a permanent breakpoint? */
if (b->owner->enable_state == bp_permanent)
{
perm_bp = b;
break;
}
count++;
b->duplicate = count > 1;
}
/* If we found a permanent breakpoint at this address, go over the
list again and declare all the other breakpoints there to be the
duplicates. */
if (perm_bp)
{
perm_bp->duplicate = 0;
/* Permanent breakpoint should always be inserted. */
if (! perm_bp->inserted)
internal_error (__FILE__, __LINE__,
_("allegedly permanent breakpoint is not "
"actually inserted"));
ALL_BP_LOCATIONS (b)
if (b != perm_bp)
{
if (b->owner->enable_state != bp_disabled
&& b->owner->enable_state != bp_call_disabled
&& b->enabled && !b->shlib_disabled
&& b->address == address /* address / overlay match */
&& (!overlay_debugging || b->section == section)
&& breakpoint_address_is_meaningful (b->owner))
{
if (b->inserted)
internal_error (__FILE__, __LINE__,
_("another breakpoint was inserted on top of "
"a permanent breakpoint"));
b->duplicate = 1;
}
}
}
}
static void
check_duplicates (struct breakpoint *bpt)
{
struct bp_location *bl = bpt->loc;
if (! breakpoint_address_is_meaningful (bpt))
return;
for (; bl; bl = bl->next)
check_duplicates_for (bl->address, bl->section);
}
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 (CORE_ADDR bpaddr, enum bptype bptype)
{
if (!gdbarch_adjust_breakpoint_address_p (current_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_catch_fork
|| bptype == bp_catch_vfork
|| bptype == bp_catch_exec)
{
/* 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 (current_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, enum bptype bp_type)
{
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 (bp_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_catch_load:
case bp_catch_unload:
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_catch_fork:
case bp_catch_vfork:
case bp_catch_exec:
loc->loc_type = bp_loc_other;
break;
default:
internal_error (__FILE__, __LINE__, _("unknown breakpoint type"));
}
/* Add this breakpoint to the end of the chain. */
loc_p = bp_location_chain;
if (loc_p == 0)
bp_location_chain = loc;
else
{
while (loc_p->global_next)
loc_p = loc_p->global_next;
loc_p->global_next = loc;
}
return loc;
}
static void free_bp_location (struct bp_location *loc)
{
if (loc->cond)
xfree (loc->cond);
xfree (loc);
}
/* Helper to set_raw_breakpoint below. Creates a breakpoint
that has type BPTYPE and has no locations as yet. */
static struct breakpoint *
set_raw_breakpoint_without_location (enum bptype bptype)
{
struct breakpoint *b, *b1;
b = (struct breakpoint *) xmalloc (sizeof (struct breakpoint));
memset (b, 0, sizeof (*b));
b->type = bptype;
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->dll_pathname = NULL;
b->triggered_dll_pathname = NULL;
b->forked_inferior_pid = 0;
b->exec_pathname = 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)
{
find_pc_partial_function (loc->address, &(loc->function_name),
NULL, NULL);
if (loc->function_name)
loc->function_name = xstrdup (loc->function_name);
}
}
/* 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 symtab_and_line sal, enum bptype bptype)
{
struct breakpoint *b = set_raw_breakpoint_without_location (bptype);
CORE_ADDR adjusted_address;
/* 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 read_memory_nobpt() 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 (sal.pc, bptype);
b->loc = allocate_bp_location (b, bptype);
b->loc->requested_address = sal.pc;
b->loc->address = adjusted_address;
if (sal.symtab == NULL)
b->source_file = NULL;
else
b->source_file = savestring (sal.symtab->filename,
strlen (sal.symtab->filename));
b->loc->section = sal.section;
b->line_number = sal.line;
set_breakpoint_location_function (b->loc);
check_duplicates (b);
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;
}
static struct breakpoint *
create_internal_breakpoint (CORE_ADDR address, enum bptype type)
{
static int internal_breakpoint_number = -1;
struct symtab_and_line sal;
struct breakpoint *b;
init_sal (&sal); /* initialize to zeroes */
sal.pc = address;
sal.section = find_pc_overlay (sal.pc);
b = set_raw_breakpoint (sal, type);
b->number = internal_breakpoint_number--;
b->disposition = disp_donttouch;
return b;
}
static void
create_longjmp_breakpoint (char *func_name)
{
struct breakpoint *b;
struct minimal_symbol *m;
if (func_name == NULL)
b = create_internal_breakpoint (0, bp_longjmp_resume);
else
{
if ((m = lookup_minimal_symbol_text (func_name, NULL)) == NULL)
return;
b = create_internal_breakpoint (SYMBOL_VALUE_ADDRESS (m), bp_longjmp);
}
b->enable_state = bp_disabled;
b->silent = 1;
if (func_name)
b->addr_string = xstrdup (func_name);
}
/* Call this routine when stepping and nexting to enable a breakpoint
if we do a longjmp(). When we hit that breakpoint, call
set_longjmp_resume_breakpoint() to figure out where we are going. */
void
enable_longjmp_breakpoint (void)
{
struct breakpoint *b;
ALL_BREAKPOINTS (b)
if (b->type == bp_longjmp)
{
b->enable_state = bp_enabled;
check_duplicates (b);
}
}
void
disable_longjmp_breakpoint (void)
{
struct breakpoint *b;
ALL_BREAKPOINTS (b)
if (b->type == bp_longjmp
|| b->type == bp_longjmp_resume)
{
b->enable_state = bp_disabled;
check_duplicates (b);
}
}
static void
create_overlay_event_breakpoint (char *func_name)
{
struct breakpoint *b;
struct minimal_symbol *m;
if ((m = lookup_minimal_symbol_text (func_name, NULL)) == NULL)
return;
b = create_internal_breakpoint (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;
}
}
void
enable_overlay_breakpoints (void)
{
struct breakpoint *b;
ALL_BREAKPOINTS (b)
if (b->type == bp_overlay_event)
{
b->enable_state = bp_enabled;
check_duplicates (b);
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;
check_duplicates (b);
overlay_events_enabled = 0;
}
}
struct breakpoint *
create_thread_event_breakpoint (CORE_ADDR address)
{
struct breakpoint *b;
b = create_internal_breakpoint (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 ("*0x%s", paddr (b->loc->address));
return b;
}
void
remove_thread_event_breakpoints (void)
{
struct breakpoint *b, *temp;
ALL_BREAKPOINTS_SAFE (b, temp)
if (b->type == bp_thread_event)
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;
};
void
remove_solib_event_breakpoints (void)
{
struct breakpoint *b, *temp;
ALL_BREAKPOINTS_SAFE (b, temp)
if (b->type == bp_shlib_event)
delete_breakpoint (b);
}
struct breakpoint *
create_solib_event_breakpoint (CORE_ADDR address)
{
struct breakpoint *b;
b = create_internal_breakpoint (address, bp_shlib_event);
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;
int disabled_shlib_breaks = 0;
ALL_BP_LOCATIONS (loc)
{
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))
&& !loc->shlib_disabled
#ifdef PC_SOLIB
&& PC_SOLIB (loc->address)
#else
&& solib_address (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;
int disabled_shlib_breaks = 0;
ALL_BP_LOCATIONS (loc)
{
struct breakpoint *b = loc->owner;
if ((loc->loc_type == bp_loc_hardware_breakpoint
|| loc->loc_type == bp_loc_software_breakpoint)
&& !loc->shlib_disabled)
{
#ifdef PC_SOLIB
char *so_name = PC_SOLIB (loc->address);
#else
char *so_name = solib_address (loc->address);
#endif
if (so_name && !strcmp (so_name, solib->so_name))
{
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\""),
so_name);
}
disabled_shlib_breaks = 1;
}
}
}
}
static void
create_fork_vfork_event_catchpoint (int tempflag, char *cond_string,
enum bptype bp_kind)
{
struct symtab_and_line sal;
struct breakpoint *b;
int thread = -1; /* All threads. */
init_sal (&sal);
sal.pc = 0;
sal.symtab = NULL;
sal.line = 0;
b = set_raw_breakpoint (sal, bp_kind);
set_breakpoint_count (breakpoint_count + 1);
b->number = breakpoint_count;
b->cond_string = (cond_string == NULL) ?
NULL : savestring (cond_string, strlen (cond_string));
b->thread = thread;
b->addr_string = NULL;
b->enable_state = bp_enabled;
b->disposition = tempflag ? disp_del : disp_donttouch;
b->forked_inferior_pid = 0;
mention (b);
}
static void
create_fork_event_catchpoint (int tempflag, char *cond_string)
{
create_fork_vfork_event_catchpoint (tempflag, cond_string, bp_catch_fork);
}
static void
create_vfork_event_catchpoint (int tempflag, char *cond_string)
{
create_fork_vfork_event_catchpoint (tempflag, cond_string, bp_catch_vfork);
}
static void
create_exec_event_catchpoint (int tempflag, char *cond_string)
{
struct symtab_and_line sal;
struct breakpoint *b;
int thread = -1; /* All threads. */
init_sal (&sal);
sal.pc = 0;
sal.symtab = NULL;
sal.line = 0;
b = set_raw_breakpoint (sal, bp_catch_exec);
set_breakpoint_count (breakpoint_count + 1);
b->number = breakpoint_count;
b->cond_string = (cond_string == NULL) ?
NULL : savestring (cond_string, strlen (cond_string));
b->thread = thread;
b->addr_string = NULL;
b->enable_state = bp_enabled;
b->disposition = tempflag ? disp_del : disp_donttouch;
mention (b);
}
static int
hw_breakpoint_used_count (void)
{
struct breakpoint *b;
int i = 0;
ALL_BREAKPOINTS (b)
{
if (b->type == bp_hardware_breakpoint && b->enable_state == bp_enabled)
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;
}
/* Call this after hitting the longjmp() breakpoint. Use this to set
a new breakpoint at the target of the jmp_buf.
FIXME - This ought to be done by setting a temporary breakpoint
that gets deleted automatically... */
void
set_longjmp_resume_breakpoint (CORE_ADDR pc, struct frame_id frame_id)
{
struct breakpoint *b;
ALL_BREAKPOINTS (b)
if (b->type == bp_longjmp_resume)
{
b->loc->requested_address = pc;
b->loc->address = adjust_breakpoint_address (b->loc->requested_address,
b->type);
b->enable_state = bp_enabled;
b->frame_id = frame_id;
check_duplicates (b);
return;
}
}
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;
check_duplicates (b);
}
}
}
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;
check_duplicates (b);
}
}
}
/* 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 symtab_and_line sal, struct frame_id frame_id,
enum bptype type)
{
struct breakpoint *b;
b = set_raw_breakpoint (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);
return b;
}
/* Tell the user we have just set a breakpoint B. */
static void
mention (struct breakpoint *b)
{
int say_where = 0;
struct cleanup *old_chain, *ui_out_chain;
struct ui_stream *stb;
stb = ui_out_stream_new (uiout);
old_chain = make_cleanup_ui_out_stream_delete (stb);
/* 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, as has already
been done for deprecated_delete_breakpoint_hook and so on. */
if (deprecated_create_breakpoint_hook)
deprecated_create_breakpoint_hook (b);
breakpoint_create_event (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, ": ");
print_expression (b->exp, stb->stream);
ui_out_field_stream (uiout, "exp", stb);
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, ": ");
print_expression (b->exp, stb->stream);
ui_out_field_stream (uiout, "exp", stb);
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, ": ");
print_expression (b->exp, stb->stream);
ui_out_field_stream (uiout, "exp", stb);
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, ": ");
print_expression (b->exp, stb->stream);
ui_out_field_stream (uiout, "exp", stb);
do_cleanups (ui_out_chain);
break;
case bp_breakpoint:
if (ui_out_is_mi_like_p (uiout))
{
say_where = 0;
break;
}
printf_filtered (_("Breakpoint %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_catch_load:
case bp_catch_unload:
printf_filtered (_("Catchpoint %d (%s %s)"),
b->number,
(b->type == bp_catch_load) ? "load" : "unload",
(b->dll_pathname != NULL) ?
b->dll_pathname : "");
break;
case bp_catch_fork:
case bp_catch_vfork:
printf_filtered (_("Catchpoint %d (%s)"),
b->number,
(b->type == bp_catch_fork) ? "fork" : "vfork");
break;
case bp_catch_exec:
printf_filtered (_("Catchpoint %d (exec)"),
b->number);
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:
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 (addressprint || b->source_file == NULL)
{
printf_filtered (" at ");
fputs_filtered (paddress (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);
}
}
}
do_cleanups (old_chain);
if (ui_out_is_mi_like_p (uiout))
return;
printf_filtered ("\n");
}
static struct bp_location *
add_location_to_breakpoint (struct breakpoint *b, enum bptype bptype,
const struct symtab_and_line *sal)
{
struct bp_location *loc, **tmp;
loc = allocate_bp_location (b, bptype);
for (tmp = &(b->loc); *tmp != NULL; tmp = &((*tmp)->next))
;
*tmp = loc;
loc->requested_address = sal->pc;
loc->address = adjust_breakpoint_address (loc->requested_address,
bptype);
loc->section = sal->section;
set_breakpoint_location_function (loc);
return loc;
}
/* 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 symtabs_and_lines sals, char *addr_string,
char *cond_string,
enum bptype type, enum bpdisp disposition,
int thread, int ignore_count, int from_tty)
{
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."));
}
for (i = 0; i < sals.nelts; ++i)
{
struct symtab_and_line sal = sals.sals[i];
struct bp_location *loc;
if (from_tty)
describe_other_breakpoints (sal.pc, sal.section, thread);
if (i == 0)
{
b = set_raw_breakpoint (sal, type);
set_breakpoint_count (breakpoint_count + 1);
b->number = breakpoint_count;
b->thread = thread;
b->cond_string = cond_string;
b->ignore_count = ignore_count;
b->enable_state = bp_enabled;
b->disposition = disposition;
loc = b->loc;
}
else
{
loc = add_location_to_breakpoint (b, type, &sal);
}
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 ("*0x%s", paddr (b->loc->address));
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. 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(), we won't expand SAL to locations at the same
line in all existing instantiations of 'foo'.
*/
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;
/* 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;
find_pc_partial_function (original_pc, &original_function, NULL, NULL);
expanded = expand_line_sal (sal);
if (expanded.nelts == 1)
{
/* We had one sal, we got one sal. Without futher
processing, just return 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 (!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;
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
expanded.sals[i].pc
= gdbarch_skip_prologue (current_gdbarch, pc);
}
}
}
}
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 symtabs_and_lines sals, char **addr_string,
char *cond_string,
enum bptype type, enum bpdisp disposition,
int thread, int ignore_count, int from_tty)
{
int i;
for (i = 0; i < sals.nelts; ++i)
{
struct symtabs_and_lines expanded =
expand_line_sal_maybe (sals.sals[i]);
create_breakpoint (expanded, addr_string[i],
cond_string, type, disposition,
thread, ignore_count, from_tty);
}
}
/* 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.section = find_pc_overlay (sal.pc);
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]);
}
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)
{
*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)
{
tok = cond_start = end_tok + 1;
parse_exp_1 (&tok, block_for_pc (pc), 0);
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
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. */
static void
break_command_really (char *arg, char *cond_string, int thread,
int parse_condition_and_thread,
int tempflag, int hardwareflag,
int ignore_count,
enum auto_boolean pending_break_support,
int from_tty)
{
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 *breakpoint_chain = NULL;
struct captured_parse_breakpoint_args parse_args;
int i;
int pending = 0;
int not_found = 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;
/* 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;
}
/* 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. */
breakpoint_chain = make_cleanup (null_cleanup, 0);
/* Mark the contents of the addr_string for cleanup. These go on
the breakpoint_chain and only occure 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);
/* 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);
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 (sals, addr_string, cond_string,
hardwareflag ? bp_hardware_breakpoint
: bp_breakpoint,
tempflag ? disp_del : disp_donttouch,
thread, ignore_count, from_tty);
}
else
{
struct symtab_and_line sal = {0};
struct breakpoint *b;
make_cleanup (xfree, copy_arg);
b = set_raw_breakpoint_without_location (hardwareflag
? bp_hardware_breakpoint
: bp_breakpoint);
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;
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 (breakpoint_chain);
/* But cleanup everything else. */
do_cleanups (old_chain);
}
/* 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 (arg,
NULL, 0, 1 /* parse arg */,
tempflag, hardwareflag,
0 /* Ignore count */,
pending_break_support, from_tty);
}
void
set_breakpoint (char *address, char *condition,
int hardwareflag, int tempflag,
int thread, int ignore_count,
int pending)
{
break_command_really (address, condition, thread,
0 /* condition and thread are valid. */,
tempflag, hardwareflag,
ignore_count,
pending
? AUTO_BOOLEAN_TRUE : AUTO_BOOLEAN_FALSE,
0);
}
/* 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.
If SAL is already past the prologue, then do nothing. */
static void
skip_prologue_sal (struct symtab_and_line *sal)
{
struct symbol *sym = find_pc_function (sal->pc);
struct symtab_and_line start_sal;
if (sym == NULL)
return;
start_sal = find_function_start_sal (sym, 1);
if (sal->pc < start_sal.pc)
*sal = start_sal;
}
/* 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)
skip_prologue_sal (sal);
}
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_function (b);
if (sym != NULL)
{
fixup_symbol_section (sym, sal->symtab->objfile);
sal->section = SYMBOL_BFD_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;
msym = lookup_minimal_symbol_by_pc (sal->pc);
if (msym)
sal->section = SYMBOL_BFD_SECTION (msym);
}
}
}
}
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 \n\
stop at \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 \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 \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 breakpoint *b, *scope_breakpoint = NULL;
struct symtab_and_line sal;
struct expression *exp;
struct block *exp_valid_block;
struct value *val, *mark;
struct frame_info *frame;
struct frame_info *prev_frame = NULL;
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;
struct expression *cond = NULL;
int i, other_type_used, target_resources_ok = 0;
enum bptype bp_type;
int mem_cnt = 0;
int thread = -1;
init_sal (&sal); /* initialize to zeroes */
/* 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 ' 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 ' 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
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;
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)
{
tok = cond_start = end_tok + 1;
cond = parse_exp_1 (&tok, 0, 0);
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 (frame)
prev_frame = get_prev_frame (frame);
else
prev_frame = NULL;
/* 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 && prev_frame)
{
scope_breakpoint = create_internal_breakpoint (get_frame_pc (prev_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 = get_frame_id (prev_frame);
/* Set the address at which we will stop. */
scope_breakpoint->loc->requested_address
= get_frame_pc (prev_frame);
scope_breakpoint->loc->address
= adjust_breakpoint_address (scope_breakpoint->loc->requested_address,
scope_breakpoint->type);
}
/* Now set up the breakpoint. */
b = set_raw_breakpoint (sal, 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;
b->loc->cond = cond;
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);
else
b->watchpoint_frame = null_frame_id;
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);
mention (b);
}
/* 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) + value_offset (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. */
/* 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 (struct continuation_arg *arg)
{
struct cleanup *cleanups;
cleanups = (struct cleanup *) arg->data.pointer;
do_exec_cleanups (cleanups);
}
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 frame_info *prev_frame = get_prev_frame (frame);
struct breakpoint *breakpoint;
struct cleanup *old_chain;
struct continuation_arg *arg1;
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 (sal, null_frame_id, bp_until);
else
/* Otherwise, specify the current frame, because we want to stop only
at the very same frame. */
breakpoint = set_momentary_breakpoint (sal, get_frame_id (frame),
bp_until);
if (!target_can_async_p ())
old_chain = make_cleanup_delete_breakpoint (breakpoint);
else
old_chain = make_exec_cleanup_delete_breakpoint (breakpoint);
/* If we are running asynchronously, and the target supports async
execution, we are not waiting for the target to stop, in the call
tp proceed, below. This means that we cannot delete the
brekpoints until the target has actually stopped. The only place
where we get a chance to do that is in fetch_inferior_event, so
we must set things up for that. */
if (target_can_async_p ())
{
/* In this case the arg for the continuation is just the point
in the exec_cleanups chain from where to start doing
cleanups, because all the continuation does is the cleanups in
the exec_cleanup_chain. */
arg1 =
(struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
arg1->next = NULL;
arg1->data.pointer = old_chain;
add_continuation (until_break_command_continuation, arg1);
}
/* Keep within the current frame, or in frames called by the current
one. */
if (prev_frame)
{
sal = find_pc_line (get_frame_pc (prev_frame), 0);
sal.pc = get_frame_pc (prev_frame);
breakpoint = set_momentary_breakpoint (sal, get_frame_id (prev_frame),
bp_until);
if (!target_can_async_p ())
make_cleanup_delete_breakpoint (breakpoint);
else
make_exec_cleanup_delete_breakpoint (breakpoint);
}
proceed (-1, TARGET_SIGNAL_DEFAULT, 0);
/* Do the cleanups now, anly if we are not running asynchronously,
of if we are, but the target is still synchronous. */
if (!target_can_async_p ())
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 examines a string, and attempts to find a token
that might be an event name in the leading characters. If a
possible match is found, a pointer to the last character of
the token is returned. Else, NULL is returned. */
static char *
ep_find_event_name_end (char *arg)
{
char *s = arg;
char *event_name_end = NULL;
/* If we could depend upon the presense of strrpbrk, we'd use that... */
if (arg == NULL)
return NULL;
/* We break out of the loop when we find a token delimiter.
Basically, we're looking for alphanumerics and underscores;
anything else delimites the token. */
while (*s != '\0')
{
if (!isalnum (*s) && (*s != '_'))
break;
event_name_end = s;
s++;
}
return event_name_end;
}
/* This function attempts to parse an optional "if " 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;
}
/* This function attempts to parse an optional filename from the arg
string. If one is not found, it returns NULL.
Else, it returns a pointer to the parsed filename. (This function
makes no attempt to verify that a file of that name exists, or is
accessible.) And, it updates arg to point to the first character
following the parsed filename in the arg string.
Note that clients needing to preserve the returned filename for
future access should copy it to their own buffers. */
static char *
ep_parse_optional_filename (char **arg)
{
static char filename[1024];
char *arg_p = *arg;
int i;
char c;
if ((*arg_p == '\0') || isspace (*arg_p))
return NULL;
for (i = 0;; i++)
{
c = *arg_p;
if (isspace (c))
c = '\0';
filename[i] = c;
if (c == '\0')
break;
arg_p++;
}
*arg = arg_p;
return filename;
}
/* Commands to deal with catching events, such as signals, exceptions,
process start/exit, etc. */
typedef enum
{
catch_fork, catch_vfork
}
catch_fork_kind;
static void
catch_fork_command_1 (catch_fork_kind fork_kind, char *arg, int tempflag,
int from_tty)
{
char *cond_string = NULL;
ep_skip_leading_whitespace (&arg);
/* The allowed syntax is:
catch [v]fork
catch [v]fork if
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:
create_fork_event_catchpoint (tempflag, cond_string);
break;
case catch_vfork:
create_vfork_event_catchpoint (tempflag, cond_string);
break;
default:
error (_("unsupported or unknown fork kind; cannot catch it"));
break;
}
}
static void
catch_exec_command_1 (char *arg, int tempflag, int from_tty)
{
char *cond_string = NULL;
ep_skip_leading_whitespace (&arg);
/* The allowed syntax is:
catch exec
catch exec if
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_exec_event_catchpoint (tempflag, cond_string);
}
static void
catch_load_command_1 (char *arg, int tempflag, int from_tty)
{
char *dll_pathname = NULL;
char *cond_string = NULL;
ep_skip_leading_whitespace (&arg);
/* The allowed syntax is:
catch load
catch load if
catch load
catch load if
The user is not allowed to specify the after an
if clause.
We'll ignore the pathological case of a file named "if".
First, check if there's an if clause. If so, then there
cannot be a filename. */
cond_string = ep_parse_optional_if_clause (&arg);
/* If there was an if clause, then there cannot be a filename.
Else, there might be a filename and an if clause. */
if (cond_string == NULL)
{
dll_pathname = ep_parse_optional_filename (&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."));
/* Create a load breakpoint that only triggers when a load of
the specified dll (or any dll, if no pathname was specified)
occurs. */
SOLIB_CREATE_CATCH_LOAD_HOOK (PIDGET (inferior_ptid), tempflag,
dll_pathname, cond_string);
}
static void
catch_unload_command_1 (char *arg, int tempflag, int from_tty)
{
char *dll_pathname = NULL;
char *cond_string = NULL;
ep_skip_leading_whitespace (&arg);
/* The allowed syntax is:
catch unload
catch unload if
catch unload
catch unload if
The user is not allowed to specify the after an
if clause.
We'll ignore the pathological case of a file named "if".
First, check if there's an if clause. If so, then there
cannot be a filename. */
cond_string = ep_parse_optional_if_clause (&arg);
/* If there was an if clause, then there cannot be a filename.
Else, there might be a filename and an if clause. */
if (cond_string == NULL)
{
dll_pathname = ep_parse_optional_filename (&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."));
/* Create an unload breakpoint that only triggers when an unload of
the specified dll (or any dll, if no pathname was specified)
occurs. */
SOLIB_CREATE_CATCH_UNLOAD_HOOK (PIDGET (inferior_ptid), tempflag,
dll_pathname, cond_string);
}
static enum print_stop_action
print_exception_catchpoint (struct breakpoint *b)
{
annotate_catchpoint (b->number);
if (strstr (b->addr_string, "throw") != NULL)
printf_filtered (_("\nCatchpoint %d (exception thrown)\n"),
b->number);
else
printf_filtered (_("\nCatchpoint %d (exception caught)\n"),
b->number);
return PRINT_SRC_AND_LOC;
}
static void
print_one_exception_catchpoint (struct breakpoint *b, CORE_ADDR *last_addr)
{
if (addressprint)
{
annotate_field (4);
ui_out_field_core_addr (uiout, "addr", b->loc->address);
}
annotate_field (5);
*last_addr = b->loc->address;
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)
{
if (strstr (b->addr_string, "throw") != NULL)
printf_filtered (_("Catchpoint %d (throw)"), b->number);
else
printf_filtered (_("Catchpoint %d (catch)"), b->number);
}
static struct breakpoint_ops gnu_v3_exception_catchpoint_ops = {
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, *nameptr;
struct symtabs_and_lines sals;
struct breakpoint *b;
if (ex_event == EX_EVENT_CATCH)
trigger_func_name = xstrdup ("__cxa_begin_catch");
else
trigger_func_name = xstrdup ("__cxa_throw");
nameptr = trigger_func_name;
sals = decode_line_1 (&nameptr, 1, NULL, 0, NULL, NULL);
if (sals.nelts == 0)
{
xfree (trigger_func_name);
return 0;
}
b = set_raw_breakpoint (sals.sals[0], bp_breakpoint);
set_breakpoint_count (breakpoint_count + 1);
b->number = breakpoint_count;
b->cond_string = (cond_string == NULL) ?
NULL : savestring (cond_string, strlen (cond_string));
b->thread = -1;
b->addr_string = trigger_func_name;
b->enable_state = bp_enabled;
b->disposition = tempflag ? disp_del : disp_donttouch;
b->ops = &gnu_v3_exception_catchpoint_ops;
xfree (sals.sals);
mention (b);
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;
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."));
}
/* Create a breakpoint struct for Ada exception catchpoints. */
static void
create_ada_exception_breakpoint (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)
{
describe_other_breakpoints (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 (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);
}
/* Implement the "catch exception" command. */
static void
catch_ada_exception_command (char *arg, int tempflag, int from_tty)
{
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;
sal = ada_decode_exception_location (arg, &addr_string, &exp_string,
&cond_string, &cond, &ops);
create_ada_exception_breakpoint (sal, addr_string, exp_string,
cond_string, cond, ops, tempflag,
from_tty);
}
/* Implement the "catch assert" command. */
static void
catch_assert_command (char *arg, int tempflag, int from_tty)
{
struct symtab_and_line sal;
char *addr_string = NULL;
struct breakpoint_ops *ops = NULL;
sal = ada_decode_assert_location (arg, &addr_string, &ops);
create_ada_exception_breakpoint (sal, addr_string, NULL, NULL, NULL, ops,
tempflag, from_tty);
}
static void
catch_command_1 (char *arg, int tempflag, int from_tty)
{
/* The first argument may be an event name, such as "start" or "load".
If so, then handle it as such. If it doesn't match an event name,
then attempt to interpret it as an exception name. (This latter is
the v4.16-and-earlier GDB meaning of the "catch" command.)
First, try to find the bounds of what might be an event name. */
char *arg1_start = arg;
char *arg1_end;
int arg1_length;
if (arg1_start == NULL)
{
/* Old behaviour was to use pre-v-4.16 syntax */
/* catch_throw_command_1 (arg1_start, tempflag, from_tty); */
/* return; */
/* Now, this is not allowed */
error (_("Catch requires an event name."));
}
arg1_end = ep_find_event_name_end (arg1_start);
if (arg1_end == NULL)
error (_("catch requires an event"));
arg1_length = arg1_end + 1 - arg1_start;
/* Try to match what we found against known event names. */
if (strncmp (arg1_start, "signal", arg1_length) == 0)
{
error (_("Catch of signal not yet implemented"));
}
else if (strncmp (arg1_start, "catch", arg1_length) == 0)
{
catch_exception_command_1 (EX_EVENT_CATCH, arg1_end + 1,
tempflag, from_tty);
}
else if (strncmp (arg1_start, "throw", arg1_length) == 0)
{
catch_exception_command_1 (EX_EVENT_THROW, arg1_end + 1,
tempflag, from_tty);
}
else if (strncmp (arg1_start, "thread_start", arg1_length) == 0)
{
error (_("Catch of thread_start not yet implemented"));
}
else if (strncmp (arg1_start, "thread_exit", arg1_length) == 0)
{
error (_("Catch of thread_exit not yet implemented"));
}
else if (strncmp (arg1_start, "thread_join", arg1_length) == 0)
{
error (_("Catch of thread_join not yet implemented"));
}
else if (strncmp (arg1_start, "start", arg1_length) == 0)
{
error (_("Catch of start not yet implemented"));
}
else if (strncmp (arg1_start, "exit", arg1_length) == 0)
{
error (_("Catch of exit not yet implemented"));
}
else if (strncmp (arg1_start, "fork", arg1_length) == 0)
{
catch_fork_command_1 (catch_fork, arg1_end + 1, tempflag, from_tty);
}
else if (strncmp (arg1_start, "vfork", arg1_length) == 0)
{
catch_fork_command_1 (catch_vfork, arg1_end + 1, tempflag, from_tty);
}
else if (strncmp (arg1_start, "exec", arg1_length) == 0)
{
catch_exec_command_1 (arg1_end + 1, tempflag, from_tty);
}
else if (strncmp (arg1_start, "load", arg1_length) == 0)
{
catch_load_command_1 (arg1_end + 1, tempflag, from_tty);
}
else if (strncmp (arg1_start, "unload", arg1_length) == 0)
{
catch_unload_command_1 (arg1_end + 1, tempflag, from_tty);
}
else if (strncmp (arg1_start, "stop", arg1_length) == 0)
{
error (_("Catch of stop not yet implemented"));
}
else if (strncmp (arg1_start, "exception", arg1_length) == 0)
{
catch_ada_exception_command (arg1_end + 1, tempflag, from_tty);
}
else if (strncmp (arg1_start, "assert", arg1_length) == 0)
{
catch_assert_command (arg1_end + 1, tempflag, from_tty);
}
/* This doesn't appear to be an event name */
else
{
/* Pre-v.4.16 behaviour was to treat the argument
as the name of an exception */
/* catch_throw_command_1 (arg1_start, tempflag, from_tty); */
/* Now this is not allowed */
error (_("Unknown event kind specified for catch"));
}
}
static void
catch_command (char *arg, int from_tty)
{
catch_command_1 (arg, 0, from_tty);
}
static void
tcatch_command (char *arg, int from_tty)
{
catch_command_1 (arg, 1, from_tty);
}
/* 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;
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 */
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->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
&& 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->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);
}
}
/* Remove locations of breakpoint BPT from
the global list of breakpoint locations. */
static void
unlink_locations_from_global_list (struct breakpoint *bpt)
{
/* This code assumes that the locations
of a breakpoint are found in the global list
in the same order, but not necessary adjacent. */
struct bp_location **tmp = &bp_location_chain;
struct bp_location *here = bpt->loc;
if (here == NULL)
return;
for (; *tmp && here;)
{
if (*tmp == here)
{
*tmp = here->global_next;
here = here->next;
}
else
{
tmp = &((*tmp)->global_next);
}
}
}
/* Delete a breakpoint and clean up all traces of it in the data
structures. */
void
delete_breakpoint (struct breakpoint *bpt)
{
struct breakpoint *b;
bpstat bs;
struct bp_location *loc;
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;
if (deprecated_delete_breakpoint_hook)
deprecated_delete_breakpoint_hook (bpt);
breakpoint_delete_event (bpt->number);
for (loc = bpt->loc; loc; loc = loc->next)
{
if (loc->inserted)
remove_breakpoint (loc, mark_inserted);
if (loc->cond)
xfree (loc->cond);
if (loc->function_name)
xfree (loc->function_name);
}
if (breakpoint_chain == bpt)
breakpoint_chain = bpt->next;
ALL_BREAKPOINTS (b)
if (b->next == bpt)
{
b->next = bpt->next;
break;
}
unlink_locations_from_global_list (bpt);
check_duplicates (bpt);
if (bpt->type != bp_hardware_watchpoint
&& bpt->type != bp_read_watchpoint
&& bpt->type != bp_access_watchpoint
&& bpt->type != bp_catch_fork
&& bpt->type != bp_catch_vfork
&& bpt->type != bp_catch_exec)
for (loc = bpt->loc; loc; loc = loc->next)
{
/* If this breakpoint location was inserted, and there is
another breakpoint at the same address, we need to
insert the other breakpoint. */
if (loc->inserted)
{
struct bp_location *loc2;
ALL_BP_LOCATIONS (loc2)
if (loc2->address == loc->address
&& loc2->section == loc->section
&& !loc->duplicate
&& loc2->owner->enable_state != bp_disabled
&& loc2->enabled
&& !loc2->shlib_disabled
&& loc2->owner->enable_state != bp_call_disabled)
{
int val;
/* We should never reach this point if there is a permanent
breakpoint at the same address as the one being deleted.
If there is a permanent breakpoint somewhere, it should
always be the only one inserted. */
if (loc2->owner->enable_state == bp_permanent)
internal_error (__FILE__, __LINE__,
_("another breakpoint was inserted on top of "
"a permanent breakpoint"));
memset (&loc2->target_info, 0, sizeof (loc2->target_info));
loc2->target_info.placed_address = loc2->address;
if (b->type == bp_hardware_breakpoint)
val = target_insert_hw_breakpoint (&loc2->target_info);
else
val = target_insert_breakpoint (&loc2->target_info);
/* If there was an error in the insert, print a message, then stop execution. */
if (val != 0)
{
struct ui_file *tmp_error_stream = mem_fileopen ();
make_cleanup_ui_file_delete (tmp_error_stream);
if (b->type == bp_hardware_breakpoint)
{
fprintf_unfiltered (tmp_error_stream,
"Cannot insert hardware breakpoint %d.\n"
"You may have requested too many hardware breakpoints.\n",
b->number);
}
else
{
fprintf_unfiltered (tmp_error_stream, "Cannot insert breakpoint %d.\n", b->number);
fprintf_filtered (tmp_error_stream, "Error accessing memory address ");
fputs_filtered (paddress (loc2->address),
tmp_error_stream);
fprintf_filtered (tmp_error_stream, ": %s.\n",
safe_strerror (val));
}
fprintf_unfiltered (tmp_error_stream,"The same program may be running in another process.");
target_terminal_ours_for_output ();
error_stream(tmp_error_stream);
}
else
loc2->inserted = 1;
}
}
}
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->dll_pathname != NULL)
xfree (bpt->dll_pathname);
if (bpt->triggered_dll_pathname != NULL)
xfree (bpt->triggered_dll_pathname);
if (bpt->exec_pathname != NULL)
xfree (bpt->exec_pathname);
/* 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. */
for (bs = stop_bpstat; 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. */
}
/* 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;
for (loc = bpt->loc; loc;)
{
struct bp_location *loc_next = loc->next;
xfree (loc);
loc = loc_next;
}
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);
}
struct cleanup *
make_exec_cleanup_delete_breakpoint (struct breakpoint *b)
{
return make_exec_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_thread_event &&
b->type != bp_overlay_event &&
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_overlay_event &&
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;
unlink_locations_from_global_list (b);
b->loc = NULL;
for (i = 0; i < sals.nelts; ++i)
{
struct bp_location *new_loc =
add_location_to_breakpoint (b, b->type, &(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 =
savestring (sals.sals[i].symtab->filename,
strlen (sals.sals[i].symtab->filename));
if (b->line_number == 0)
b->line_number = sals.sals[i].line;
}
/* 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 (e->address == 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;
}
}
}
}
}
while (existing_locations)
{
struct bp_location *next = existing_locations->next;
free_bp_location (existing_locations);
existing_locations = next;
}
}
/* 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 = {};
struct symtabs_and_lines expanded;
char *s;
enum enable_state save_enable;
struct gdb_exception e;
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_catch_load:
case bp_catch_unload:
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;
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)
break;
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;
find_condition_and_thread (s, sals.sals[0].pc,
&cond_string, &thread);
if (cond_string)
b->cond_string = cond_string;
b->thread = thread;
b->condition_not_parsed = 0;
}
expanded = expand_line_sal_maybe (sals.sals[0]);
update_breakpoint_locations (b, expanded);
/* Now that this is re-enabled, check_duplicates
can be used. */
check_duplicates (b);
xfree (sals.sals);
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_catch_fork:
case bp_catch_vfork:
case bp_catch_exec:
break;
default:
printf_filtered (_("Deleting unknown breakpoint type %d\n"), b->type);
/* fall through */
/* Delete longjmp and overlay event breakpoints; they will be
reset later by breakpoint_re_set. */
case bp_longjmp:
case bp_longjmp_resume:
case bp_overlay_event:
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:
break;
}
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;
save_language = current_language->la_language;
save_input_radix = input_radix;
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;
if (gdbarch_get_longjmp_target_p (current_gdbarch))
{
create_longjmp_breakpoint ("longjmp");
create_longjmp_breakpoint ("_longjmp");
create_longjmp_breakpoint ("siglongjmp");
create_longjmp_breakpoint ("_siglongjmp");
create_longjmp_breakpoint (NULL);
}
create_overlay_event_breakpoint ("_ovly_debug_event");
}
/* 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);
}
}
/* 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 ();
breakpoint_modify_event (b->number);
return;
}
error (_("No breakpoint number %d."), bptnum);
}
/* Clear the ignore counts of all breakpoints. */
void
breakpoint_clear_ignore_counts (void)
{
struct breakpoint *b;
ALL_BREAKPOINTS (b)
b->ignore_count = 0;
}
/* 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;
check_duplicates (bpt);
if (deprecated_modify_breakpoint_hook)
deprecated_modify_breakpoint_hook (bpt);
breakpoint_modify_event (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_catch_load:
case bp_catch_unload:
case bp_catch_fork:
case bp_catch_vfork:
case bp_catch_exec:
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;
check_duplicates (loc->owner);
}
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 frame_id saved_frame_id;
saved_frame_id = get_frame_id (get_selected_frame (NULL));
if (bpt->exp_valid_block != NULL)
{
struct frame_info *fr =
fr = frame_find_by_id (bpt->watchpoint_frame);
if (fr == NULL)
{
printf_filtered (_("\
Cannot enable watchpoint %d because the block in which its expression\n\
is valid is not currently in scope.\n"), bpt->number);
return;
}
select_frame (fr);
}
if (bpt->val)
value_free (bpt->val);
mark = value_mark ();
fetch_watchpoint_value (bpt->exp, &bpt->val, NULL, NULL);
if (bpt->val)
release_value (bpt->val);
bpt->val_valid = 1;
if (bpt->type == bp_hardware_watchpoint ||
bpt->type == bp_read_watchpoint ||
bpt->type == bp_access_watchpoint)
{
int i = hw_watchpoint_used_count (bpt->type, &other_type_used);
int mem_cnt = can_use_hardware_watchpoint (bpt->val);
/* Hack around 'unused var' error for some targets here */
(void) mem_cnt, (void) i;
target_resources_ok = TARGET_CAN_USE_HARDWARE_WATCHPOINT (
bpt->type, i + mem_cnt, other_type_used);
/* we can consider of type is bp_hardware_watchpoint, convert to
bp_watchpoint in the following condition */
if (target_resources_ok < 0)
{
printf_filtered (_("\
Cannot enable watchpoint %d because target watch resources\n\
have been allocated for other watchpoints.\n"), bpt->number);
value_free_to_mark (mark);
return;
}
}
select_frame (frame_find_by_id (saved_frame_id));
value_free_to_mark (mark);
}
if (bpt->enable_state != bp_permanent)
bpt->enable_state = bp_enabled;
bpt->disposition = disposition;
check_duplicates (bpt);
breakpoints_changed ();
if (deprecated_modify_breakpoint_hook)
deprecated_modify_breakpoint_hook (bpt);
breakpoint_modify_event (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_catch_load:
case bp_catch_unload:
case bp_catch_fork:
case bp_catch_vfork:
case bp_catch_exec:
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;
check_duplicates (loc->owner);
}
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)
{
}
/* 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 (CORE_ADDR pc)
{
struct bp_target_info *bp_tgt;
bp_tgt = xmalloc (sizeof (struct bp_target_info));
memset (bp_tgt, 0, sizeof (struct bp_target_info));
bp_tgt->placed_address = pc;
if (target_insert_breakpoint (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 (void *bp)
{
struct bp_target_info *bp_tgt = bp;
int ret;
ret = target_remove_breakpoint (bp_tgt);
xfree (bp_tgt);
return ret;
}
/* One (or perhaps two) breakpoints used for software single stepping. */
static void *single_step_breakpoints[2];
/* Create and insert a breakpoint for software single step. */
void
insert_single_step_breakpoint (CORE_ADDR next_pc)
{
void **bpt_p;
if (single_step_breakpoints[0] == NULL)
bpt_p = &single_step_breakpoints[0];
else
{
gdb_assert (single_step_breakpoints[1] == NULL);
bpt_p = &single_step_breakpoints[1];
}
/* 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 (next_pc);
if (*bpt_p == NULL)
error (_("Could not insert single-step breakpoint at 0x%s"),
paddr_nz (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_breakpoints[0]);
single_step_breakpoints[0] = NULL;
if (single_step_breakpoints[1] != NULL)
{
deprecated_remove_raw_breakpoint (single_step_breakpoints[1]);
single_step_breakpoints[1] = NULL;
}
}
/* Check whether a software single-step breakpoint is inserted at PC. */
static int
single_step_breakpoint_inserted_here_p (CORE_ADDR pc)
{
int i;
for (i = 0; i < 2; i++)
{
struct bp_target_info *bp_tgt = single_step_breakpoints[i];
if (bp_tgt && bp_tgt->placed_address == pc)
return 1;
}
return 0;
}
/* 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."
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);
breakpoint_chain = 0;
/* Don't bother to call set_breakpoint_count. $bpnum isn't useful
before a breakpoint is set. */
breakpoint_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);
add_com_alias ("bu", "ubreak", 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 \"$bpnum\" contains the number of the last\n\
breakpoint set."));
if (xdb_commands)
add_com ("lb", class_breakpoint, breakpoints_info, _("\
Status of user-settable breakpoints, or breakpoint number NUMBER.\n\
The \"Type\" column indicates one of:\n\
\tbreakpoint - normal breakpoint\n\
\twatchpoint - watchpoint\n\
The \"Disp\" column contains one of \"keep\", \"del\", or \"dis\" to indicate\n\
the disposition of the breakpoint after it gets hit. \"dis\" means that the\n\
breakpoint will be disabled. The \"Address\" and \"What\" columns indicate the\n\
address and file/line number respectively.\n\
\n\
Convenience variable \"$_\" 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_com ("catch", class_breakpoint, catch_command, _("\
Set catchpoints to catch events.\n\
Raised signals may be caught:\n\
\tcatch signal - all signals\n\
\tcatch signal - a particular signal\n\
Raised exceptions may be caught:\n\
\tcatch throw - all exceptions, when thrown\n\
\tcatch throw - a particular exception, when thrown\n\
\tcatch catch - all exceptions, when caught\n\
\tcatch catch - a particular exception, when caught\n\
Thread or process events may be caught:\n\
\tcatch thread_start - any threads, just after creation\n\
\tcatch thread_exit - any threads, just before expiration\n\
\tcatch thread_join - any threads, just after joins\n\
Process events may be caught:\n\
\tcatch start - any processes, just after creation\n\
\tcatch exit - any processes, just before expiration\n\
\tcatch fork - calls to fork()\n\
\tcatch vfork - calls to vfork()\n\
\tcatch exec - calls to exec()\n\
Dynamically-linked library events may be caught:\n\
\tcatch load - loads of any library\n\
\tcatch load - loads of a particular library\n\
\tcatch unload - unloads of any library\n\
\tcatch unload - unloads of a particular library\n\
The act of your program's execution stopping may also be caught:\n\
\tcatch stop\n\n\
C++ exceptions may be caught:\n\
\tcatch throw - all exceptions, when thrown\n\
\tcatch catch - all exceptions, when caught\n\
Ada exceptions may be caught:\n\
\tcatch exception - all exceptions, when raised\n\
\tcatch exception - a particular exception, when raised\n\
\tcatch exception unhandled - all unhandled exceptions, when raised\n\
\tcatch assert - all failed assertions, when raised\n\
\n\
Do \"help set follow-fork-mode\" for info on debugging your program\n\
after a fork or vfork is caught.\n\n\
Do \"help breakpoints\" for info on other commands dealing with breakpoints."));
add_com ("tcatch", class_breakpoint, tcatch_command, _("\
Set temporary catchpoints to catch events.\n\
Args like \"catch\" command.\n\
Like \"catch\" except the catchpoint is only temporary,\n\
so it will be deleted when hit. Equivalent to \"catch\" followed\n\
by using \"enable delete\" on the catchpoint number."));
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, location_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, location_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, location_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;
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);
automatic_hardware_breakpoints = 1;
}