/* Everything about breakpoints, for GDB.
- Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
+ Copyright (C) 1986, 1987, 1989, 1990 Free Software Foundation, Inc.
This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+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 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+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 GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
+#include <ctype.h>
#include "defs.h"
#include "param.h"
#include "symtab.h"
#include "frame.h"
-
-/* This is the sequence of bytes we insert for a breakpoint. */
-
-static char break_insn[] = BREAKPOINT;
+#include "breakpoint.h"
+#include "expression.h"
+#include "gdbcore.h"
+#include "gdbcmd.h"
+#include "value.h"
+#include "ctype.h"
+#include "command.h"
+#include "inferior.h"
+#include "target.h"
+#include "language.h"
+#include <string.h>
+
+extern int addressprint; /* Print machine addresses? */
+extern int demangle; /* Print de-mangled symbol names? */
+
+extern int catch_errors ();
+extern void set_next_address (); /* ...for x/ command */
+
+/* Are we executing breakpoint commands? */
+static int executing_breakpoint_commands;
/* States of enablement of breakpoint.
`temporary' means disable when hit.
enum enable { disabled, enabled, temporary, delete};
/* Not that the ->silent field is not currently used by any commands
- (though the code is in there if it was to be and set_raw_breakpoint
+ (though the code is in there if it was to be, and set_raw_breakpoint
does set it to 0). I implemented it because I thought it would be
useful for a hack I had to put in; I'm going to leave it in because
I can see how there might be times when it would indeed be useful */
+/* This is for a breakpoint or a watchpoint. */
+
struct breakpoint
{
struct breakpoint *next;
/* Number assigned to distinguish breakpoints. */
int number;
- /* Address to break at. */
+ /* Address to break at, or NULL if not a breakpoint. */
CORE_ADDR address;
- /* Line number of this address. Redundant. */
+ /* Line number of this address. Redundant. Only matters if address
+ is non-NULL. */
int line_number;
- /* Symtab of file of this address. Redundant. */
+ /* Symtab of file of this address. Redundant. Only matters if address
+ is non-NULL. */
struct symtab *symtab;
/* Zero means disabled; remember the info but don't break here. */
enum enable enable;
be continued automatically before really stopping. */
int ignore_count;
/* "Real" contents of byte where breakpoint has been inserted.
- Valid only when breakpoints are in the program. */
- char shadow_contents[sizeof break_insn];
- /* Nonzero if this breakpoint is now inserted. */
+ Valid only when breakpoints are in the program. Under the complete
+ control of the target insert_breakpoint and remove_breakpoint routines.
+ No other code should assume anything about the value(s) here. */
+ char shadow_contents[BREAKPOINT_MAX];
+ /* Nonzero if this breakpoint is now inserted. Only matters if address
+ is non-NULL. */
char inserted;
/* Nonzero if this is not the first breakpoint in the list
- for the given address. */
+ for the given address. Only matters if address is non-NULL. */
char duplicate;
/* Chain of command lines to execute when this breakpoint is hit. */
struct command_line *commands;
FRAME_ADDR frame;
/* Conditional. Break only if this expression's value is nonzero. */
struct expression *cond;
+
+ /* String we used to set the breakpoint (malloc'd). Only matters if
+ address is non-NULL. */
+ char *addr_string;
+ /* String form of the breakpoint condition (malloc'd), or NULL if there
+ is no condition. */
+ char *cond_string;
+
+ /* The expression we are watching, or NULL if not a watchpoint. */
+ struct expression *exp;
+ /* The largest block within which it is valid, or NULL if it is
+ valid anywhere (e.g. consists just of global symbols). */
+ struct block *exp_valid_block;
+ /* Value of the watchpoint the last time we checked it. */
+ value val;
};
#define ALL_BREAKPOINTS(b) for (b = breakpoint_chain; b; b = b->next)
static int breakpoint_count;
+/* Set breakpoint count to NUM. */
+static void
+set_breakpoint_count (num)
+ int num;
+{
+ breakpoint_count = num;
+ set_internalvar (lookup_internalvar ("bpnum"),
+ value_from_longest (builtin_type_int, (LONGEST) num));
+}
+
/* 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
struct symtab *default_breakpoint_symtab;
int default_breakpoint_line;
-/* Remaining commands (not yet executed)
- of last breakpoint hit. */
-
-struct command_line *breakpoint_commands;
-
static void delete_breakpoint ();
-void clear_momentary_breakpoints ();
void breakpoint_auto_delete ();
/* Flag indicating extra verbosity for xgdb. */
extern int xgdb_verbose;
\f
+/* *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 "$" followed by the name
+ of a convenience variable. Making it an expression wouldn't work well
+ for map_breakpoint_numbers (e.g. "4 + 5 + 6"). */
+static int
+get_number (pp)
+ char **pp;
+{
+ int retval;
+ char *p = *pp;
+
+ if (p == NULL)
+ /* Empty line means refer to the last breakpoint. */
+ return breakpoint_count;
+ else if (*p == '$')
+ {
+ /* Make a copy of the name, so we can null-terminate it
+ to pass to lookup_internalvar(). */
+ char *varname;
+ char *start = ++p;
+ 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)
+ error (
+"Convenience variables used to specify breakpoints must have integer values."
+ );
+ retval = (int) value_as_long (val);
+ }
+ else
+ {
+ while (*p >= '0' && *p <= '9')
+ ++p;
+ if (p == *pp)
+ /* There is no number here. (e.g. "cond a == b"). */
+ error_no_arg ("breakpoint number");
+ retval = atoi (*pp);
+ }
+ if (!(isspace (*p) || *p == '\0'))
+ error ("breakpoint number expected");
+ while (isspace (*p))
+ p++;
+ *pp = p;
+ return retval;
+}
+\f
/* condition N EXP -- set break condition of breakpoint N to EXP. */
static void
int from_tty;
{
register struct breakpoint *b;
- register char *p;
+ char *p;
register int bnum;
- register struct expression *expr;
if (arg == 0)
error_no_arg ("breakpoint number");
p = arg;
- while (*p >= '0' && *p <= '9') p++;
- if (p == arg)
- /* There is no number here. (e.g. "cond a == b"). */
- error_no_arg ("breakpoint number");
- bnum = atoi (arg);
+ bnum = get_number (&p);
ALL_BREAKPOINTS (b)
if (b->number == bnum)
{
if (b->cond)
- free (b->cond);
+ {
+ free (b->cond);
+ b->cond = 0;
+ }
+ if (b->cond_string != NULL)
+ free (b->cond_string);
+
if (*p == 0)
{
b->cond = 0;
+ b->cond_string = NULL;
if (from_tty)
printf ("Breakpoint %d now unconditional.\n", bnum);
}
else
{
- if (*p != ' ' && *p != '\t')
- error ("Arguments must be an integer (breakpoint number) and an expression.");
-
- /* Find start of expression */
- while (*p == ' ' || *p == '\t') p++;
-
arg = p;
- b->cond = (struct expression *) parse_c_1 (&arg, block_for_pc (b->address), 0);
+ /* 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->cond = parse_exp_1 (&arg, block_for_pc (b->address), 0);
if (*arg)
error ("Junk at end of expression");
}
error ("No breakpoint number %d.", bnum);
}
+/* ARGSUSED */
static void
-commands_command (arg)
+commands_command (arg, from_tty)
char *arg;
+ int from_tty;
{
register struct breakpoint *b;
- register char *p, *p1;
+ char *p;
register int bnum;
struct command_line *l;
free the storage, if we change the commands currently
being read from. */
- if (breakpoint_commands)
+ if (executing_breakpoint_commands)
error ("Can't use the \"commands\" command among a breakpoint's commands.");
- /* Allow commands by itself to refer to the last breakpoint. */
- if (arg == 0)
- bnum = breakpoint_count;
- else
- {
- p = arg;
- if (! (*p >= '0' && *p <= '9'))
- error ("Argument must be integer (a breakpoint number).");
-
- while (*p >= '0' && *p <= '9') p++;
- if (*p)
- error ("Unexpected extra arguments following breakpoint number.");
+ p = arg;
+ bnum = get_number (&p);
+ if (p && *p)
+ error ("Unexpected extra arguments following breakpoint number.");
- bnum = atoi (arg);
- }
-
ALL_BREAKPOINTS (b)
if (b->number == bnum)
{
- if (input_from_terminal_p ())
+ if (from_tty && input_from_terminal_p ())
{
printf ("Type commands for when breakpoint %d is hit, one per line.\n\
End with a line saying just \"end\".\n", bnum);
}
error ("No breakpoint number %d.", bnum);
}
+\f
+extern int memory_breakpoint_size; /* from mem-break.c */
-/* Called from command loop to execute the commands
- associated with the breakpoint we just stopped at. */
-
-void
-do_breakpoint_commands ()
+/* Like target_read_memory() but if breakpoints are inserted, return
+ the shadow contents instead of the breakpoints themselves. */
+int
+read_memory_nobpt (memaddr, myaddr, len)
+ CORE_ADDR memaddr;
+ char *myaddr;
+ unsigned len;
{
- while (breakpoint_commands)
- {
- char *line = breakpoint_commands->line;
- breakpoint_commands = breakpoint_commands->next;
- execute_command (line, 0);
- /* If command was "cont", breakpoint_commands is now 0,
- of if we stopped at yet another breakpoint which has commands,
- it is now the commands for the new breakpoint. */
- }
- clear_momentary_breakpoints ();
-}
+ int status;
+ struct breakpoint *b;
-/* Used when the program is proceeded, to eliminate any remaining
- commands attached to the previous breakpoint we stopped at. */
+ if (memory_breakpoint_size < 0)
+ /* No breakpoints on this machine. */
+ return target_read_memory (memaddr, myaddr, len);
+
+ ALL_BREAKPOINTS (b)
+ {
+ if (b->address == NULL || !b->inserted)
+ continue;
+ else if (b->address + memory_breakpoint_size <= memaddr)
+ /* The breakpoint is entirely before the chunk of memory
+ we are reading. */
+ continue;
+ else if (b->address >= memaddr + len)
+ /* The breakpoint is entirely after the chunk of memory we
+ are reading. */
+ continue;
+ else
+ {
+ /* Copy the breakpoint from the shadow contents, and recurse
+ for the things before and after. */
+
+ /* Addresses and length of the part of the breakpoint that
+ we need to copy. */
+ CORE_ADDR membpt = b->address;
+ unsigned int bptlen = memory_breakpoint_size;
+ /* Offset within shadow_contents. */
+ int bptoffset = 0;
+
+ if (membpt < memaddr)
+ {
+ /* Only copy the second part of the breakpoint. */
+ bptlen -= memaddr - membpt;
+ bptoffset = memaddr - membpt;
+ membpt = memaddr;
+ }
-void
-clear_breakpoint_commands ()
-{
- breakpoint_commands = 0;
- breakpoint_auto_delete (0);
-}
+ if (membpt + bptlen > memaddr + len)
+ {
+ /* Only copy the first part of the breakpoint. */
+ bptlen -= (membpt + bptlen) - (memaddr + len);
+ }
-/* Functions to get and set the current list of pending
- breakpoint commands. These are used by run_stack_dummy
- to preserve the commands around a function call. */
+ bcopy (b->shadow_contents + bptoffset,
+ myaddr + membpt - memaddr, bptlen);
-struct command_line *
-get_breakpoint_commands ()
-{
- return breakpoint_commands;
-}
+ if (membpt > memaddr)
+ {
+ /* Copy the section of memory before the breakpoint. */
+ status = read_memory_nobpt (memaddr, myaddr, membpt - memaddr);
+ if (status != 0)
+ return status;
+ }
-void
-set_breakpoint_commands (cmds)
- struct command_line *cmds;
-{
- breakpoint_commands = cmds;
+ if (membpt + bptlen < memaddr + len)
+ {
+ /* Copy the section of memory after the breakpoint. */
+ status = read_memory_nobpt
+ (membpt + bptlen,
+ myaddr + membpt + bptlen - memaddr,
+ memaddr + len - (membpt + bptlen));
+ if (status != 0)
+ return status;
+ }
+ return 0;
+ }
+ }
+ /* Nothing overlaps. Just call read_memory_noerr. */
+ return target_read_memory (memaddr, myaddr, len);
}
\f
/* insert_breakpoints is used when starting or continuing the program.
insert_breakpoints ()
{
register struct breakpoint *b;
- int val;
-
-#ifdef BREAKPOINT_DEBUG
- printf ("Inserting breakpoints.\n");
-#endif /* BREAKPOINT_DEBUG */
+ int val = 0;
+ int disabled_breaks = 0;
ALL_BREAKPOINTS (b)
- if (b->enable != disabled && ! b->inserted && ! b->duplicate)
+ if (b->address != NULL
+ && b->enable != disabled
+ && ! b->inserted
+ && ! b->duplicate)
{
- read_memory (b->address, b->shadow_contents, sizeof break_insn);
- val = write_memory (b->address, break_insn, sizeof break_insn);
+ val = target_insert_breakpoint(b->address, b->shadow_contents);
if (val)
- return val;
-#ifdef BREAKPOINT_DEBUG
- printf ("Inserted breakpoint at 0x%x, shadow 0x%x, 0x%x.\n",
- b->address, b->shadow_contents[0], b->shadow_contents[1]);
-#endif /* BREAKPOINT_DEBUG */
- b->inserted = 1;
+ {
+ /* Can't set the breakpoint. */
+#if defined (DISABLE_UNSETTABLE_BREAK)
+ if (DISABLE_UNSETTABLE_BREAK (b->address))
+ {
+ val = 0;
+ b->enable = disabled;
+ if (!disabled_breaks)
+ {
+ fprintf (stderr,
+ "Cannot insert breakpoint %d:\n", b->number);
+ printf_filtered ("Disabling shared library breakpoints:\n");
+ }
+ disabled_breaks = 1;
+ printf_filtered ("%d ", b->number);
+ }
+ else
+#endif
+ {
+ fprintf (stderr, "Cannot insert breakpoint %d:\n", b->number);
+#ifdef ONE_PROCESS_WRITETEXT
+ fprintf (stderr,
+ "The same program may be running in another process.\n");
+#endif
+ memory_error (val, b->address); /* which bombs us out */
+ }
+ }
+ else
+ b->inserted = 1;
}
- return 0;
+ if (disabled_breaks)
+ printf_filtered ("\n");
+ return val;
}
int
#endif /* BREAKPOINT_DEBUG */
ALL_BREAKPOINTS (b)
- if (b->inserted)
+ if (b->address != NULL && b->inserted)
{
- val = write_memory (b->address, b->shadow_contents, sizeof break_insn);
+ val = target_remove_breakpoint(b->address, b->shadow_contents);
if (val)
return val;
b->inserted = 0;
#ifdef BREAKPOINT_DEBUG
- printf ("Removed breakpoint at 0x%x, shadow 0x%x, 0x%x.\n",
- b->address, b->shadow_contents[0], b->shadow_contents[1]);
+ printf ("Removed breakpoint at %s",
+ local_hex_string(b->address));
+ printf (", shadow %s",
+ local_hex_string(b->shadow_contents[0]));
+ printf (", %s.\n",
+ local_hex_string(b->shadow_contents[1]));
#endif /* BREAKPOINT_DEBUG */
}
return 0;
}
+\f
+/* bpstat stuff. External routines' interfaces are documented
+ in breakpoint.h. */
+void
+bpstat_clear (bsp)
+ bpstat *bsp;
+{
+ bpstat p;
+ bpstat q;
-/* Evaluate the expression EXP and return 1 if value is zero.
- This is used inside a catch_errors to evaluate the breakpoint condition. */
+ if (bsp == 0)
+ return;
+ p = *bsp;
+ while (p != NULL)
+ {
+ q = p->next;
+ if (p->old_val != NULL)
+ value_free (p->old_val);
+ free (p);
+ p = q;
+ }
+ *bsp = NULL;
+}
+
+bpstat
+bpstat_copy (bs)
+ bpstat bs;
+{
+ bpstat p = NULL;
+ bpstat tmp;
+ bpstat retval;
+
+ if (bs == NULL)
+ return bs;
+
+ for (; bs != NULL; bs = bs->next)
+ {
+ tmp = (bpstat) xmalloc (sizeof (*tmp));
+ bcopy (bs, tmp, sizeof (*tmp));
+ if (p == NULL)
+ /* This is the first thing in the chain. */
+ retval = tmp;
+ else
+ p->next = tmp;
+ p = tmp;
+ }
+ p->next = NULL;
+ return retval;
+}
int
-breakpoint_cond_eval (exp)
- struct expression *exp;
+bpstat_num (bsp)
+ bpstat *bsp;
+{
+ struct breakpoint *b;
+
+ if ((*bsp) == NULL)
+ return 0; /* No more breakpoint values */
+ else
+ {
+ b = (*bsp)->breakpoint_at;
+ *bsp = (*bsp)->next;
+ if (b == NULL)
+ return -1; /* breakpoint that's been deleted since */
+ else
+ return b->number; /* We have its number */
+ }
+}
+
+void
+bpstat_clear_actions (bs)
+ bpstat bs;
+{
+ for (; bs != NULL; bs = bs->next)
+ {
+ bs->commands = NULL;
+ 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 */
+/* ARGSUSED */
+static void
+cleanup_executing_breakpoints (ignore)
+ int ignore;
{
- return value_zerop (evaluate_expression (exp));
+ executing_breakpoint_commands = 0;
}
-/* Return 0 if PC is not the address just after a breakpoint,
- or -1 if breakpoint says do not stop now,
- or -2 if breakpoint says it has deleted itself and don't stop,
- or -3 if hit a breakpoint number -3 (delete when program stops),
- or else the number of the breakpoint,
- with 0x1000000 added (or subtracted, for a negative return value) for
- a silent breakpoint. */
+/* 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 (bsp)
+ bpstat *bsp;
+{
+ bpstat bs;
+ struct cleanup *old_chain;
+
+ executing_breakpoint_commands = 1;
+ old_chain = make_cleanup (cleanup_executing_breakpoints, 0);
+
+top:
+ bs = *bsp;
+
+ breakpoint_proceeded = 0;
+ for (; bs != NULL; bs = bs->next)
+ {
+ while (bs->commands)
+ {
+ char *line = bs->commands->line;
+ bs->commands = bs->commands->next;
+ execute_command (line, 0);
+ /* If 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. */
+ if (breakpoint_proceeded)
+ goto top;
+ }
+ }
+ clear_momentary_breakpoints ();
+
+ executing_breakpoint_commands = 0;
+ discard_cleanups (old_chain);
+}
int
-breakpoint_stop_status (pc, frame_address)
- CORE_ADDR pc;
+bpstat_print (bs)
+ bpstat bs;
+{
+ /* bs->breakpoint_at can be NULL if it was a momentary breakpoint
+ which has since been deleted. */
+ if (bs == NULL || bs->breakpoint_at == NULL)
+ return 0;
+
+ /* If bpstat_stop_status says don't print, OK, we won't. An example
+ circumstance is when we single-stepped for both a watchpoint and
+ for a "stepi" instruction. The bpstat says that the watchpoint
+ explains the stop, but we shouldn't print because the watchpoint's
+ value didn't change -- and the real reason we are stopping here
+ rather than continuing to step (as the watchpoint would've had us do)
+ is because of the "stepi". */
+ if (!bs->print)
+ return 0;
+
+ if (bs->breakpoint_at->address != NULL)
+ {
+ /* I think the user probably only wants to see one breakpoint
+ number, not all of them. */
+ printf_filtered ("\nBreakpoint %d, ", bs->breakpoint_at->number);
+ return 0;
+ }
+
+ if (bs->old_val != NULL)
+ {
+ printf_filtered ("\nWatchpoint %d, ", bs->breakpoint_at->number);
+ print_expression (bs->breakpoint_at->exp, stdout);
+ printf_filtered ("\nOld value = ");
+ value_print (bs->old_val, stdout, 0, Val_pretty_default);
+ printf_filtered ("\nNew value = ");
+ value_print (bs->breakpoint_at->val, stdout, 0,
+ Val_pretty_default);
+ printf_filtered ("\n");
+ value_free (bs->old_val);
+ bs->old_val = NULL;
+ return 1;
+ }
+
+ /* 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). */
+ if (bs->next)
+ return bpstat_print (bs->next);
+
+ fprintf_filtered (stderr, "gdb internal error: in bpstat_print\n");
+ return 0;
+}
+
+/* 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 (exp)
+ char *exp;
+{
+ return !value_true (evaluate_expression ((struct expression *)exp));
+}
+
+/* Allocate a new bpstat and chain it to the current one. */
+
+static bpstat
+bpstat_alloc (b, cbs)
+ register struct breakpoint *b;
+ bpstat cbs; /* Current "bs" value */
+{
+ bpstat bs;
+
+ bs = (bpstat) xmalloc (sizeof (*bs));
+ cbs->next = bs;
+ bs->breakpoint_at = b;
+ /* If the condition is false, etc., don't do the commands. */
+ bs->commands = NULL;
+ bs->momentary = b->number == -3;
+ bs->old_val = NULL;
+ return bs;
+}
+
+/* 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, and
+ the first element of the chain contains summary "stop" and
+ "print" flags for the whole chain.
+
+ Each element of the chain refers to a particular breakpoint or
+ watchpoint at which we have stopped. (We may have stopped for
+ several reasons.)
+
+ Each element of the chain has valid next, breakpoint_at,
+ commands, FIXME??? fields.
+
+ */
+
+
+bpstat
+bpstat_stop_status (pc, frame_address)
+ CORE_ADDR *pc;
FRAME_ADDR frame_address;
{
register struct breakpoint *b;
- register int cont = 0;
+ int stop = 0;
+ int print = 0;
+ CORE_ADDR bp_addr;
+#if DECR_PC_AFTER_BREAK != 0 || defined (SHIFT_INST_REGS)
+ /* True if we've hit a breakpoint (as opposed to a watchpoint). */
+ int real_breakpoint = 0;
+#endif
+ /* Root of the chain of bpstat's */
+ struct bpstat__struct root_bs[1];
+ /* Pointer to the last thing in the chain currently. */
+ bpstat bs = root_bs;
/* Get the address where the breakpoint would have been. */
- pc -= DECR_PC_AFTER_BREAK;
+ bp_addr = *pc - DECR_PC_AFTER_BREAK;
ALL_BREAKPOINTS (b)
- if (b->enable != disabled && b->address == pc)
- {
- if (b->frame && b->frame != frame_address)
- cont = -1;
- else
+ {
+ int this_bp_stop;
+ int this_bp_print;
+
+ if (b->enable == disabled)
+ continue;
+ if (b->address != NULL && b->address != bp_addr)
+ continue;
+
+ bs = bpstat_alloc (b, bs); /* Alloc a bpstat to explain stop */
+
+ this_bp_stop = 1;
+ this_bp_print = 1;
+
+ if (b->exp != NULL) /* Watchpoint */
+ {
+ int within_current_scope;
+ if (b->exp_valid_block != NULL)
+ within_current_scope =
+ contained_in (get_selected_block (), b->exp_valid_block);
+ else
+ within_current_scope = 1;
+
+ 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. */
+
+ value mark = value_mark ();
+ value new_val = evaluate_expression (b->exp);
+ if (!value_equal (b->val, new_val))
+ {
+ release_value (new_val);
+ value_free_to_mark (mark);
+ bs->old_val = b->val;
+ b->val = new_val;
+ /* We will stop here */
+ }
+ else
+ {
+ /* Nothing changed, don't do anything. */
+ value_free_to_mark (mark);
+ continue;
+ /* We won't stop here */
+ }
+ }
+ 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). */
+ b->enable = disabled;
+ printf_filtered ("\
+Watchpoint %d disabled because the program has left the block in\n\
+which its expression is valid.\n", b->number);
+ /* We won't stop here */
+ /* FIXME, maybe we should stop here!!! */
+ continue;
+ }
+ }
+#if DECR_PC_AFTER_BREAK != 0 || defined (SHIFT_INST_REGS)
+ else
+ real_breakpoint = 1;
+#endif
+
+ if (b->frame && b->frame != frame_address)
+ this_bp_stop = 0;
+ else
+ {
+ int value_is_zero;
+
+ if (b->cond)
+ {
+ /* Need to select the frame, with all that implies
+ so that the conditions will have the right context. */
+ select_frame (get_current_frame (), 0);
+ value_is_zero
+ = catch_errors (breakpoint_cond_eval, (char *)(b->cond),
+ "Error in testing breakpoint condition:\n");
+ /* FIXME-someday, should give breakpoint # */
+ free_all_values ();
+ }
+ if (b->cond && value_is_zero)
+ {
+ this_bp_stop = 0;
+ }
+ else if (b->ignore_count > 0)
+ {
+ b->ignore_count--;
+ this_bp_stop = 0;
+ }
+ else
+ {
+ /* We will stop here */
+ if (b->enable == temporary)
+ b->enable = disabled;
+ bs->commands = b->commands;
+ if (b->silent)
+ this_bp_print = 0;
+ if (bs->commands && !strcmp ("silent", bs->commands->line))
+ {
+ bs->commands = bs->commands->next;
+ this_bp_print = 0;
+ }
+ }
+ }
+ if (this_bp_stop)
+ stop = 1;
+ if (this_bp_print)
+ print = 1;
+ }
+
+ bs->next = NULL; /* Terminate the chain */
+ bs = root_bs->next; /* Re-grab the head of the chain */
+ if (bs)
+ {
+ bs->stop = stop;
+ bs->print = print;
+#if DECR_PC_AFTER_BREAK != 0 || defined (SHIFT_INST_REGS)
+ if (real_breakpoint)
+ {
+ *pc = bp_addr;
+#if defined (SHIFT_INST_REGS)
{
- int value_zero;
- if (b->cond)
- {
- /* Need to select the frame, with all that implies
- so that the conditions will have the right context. */
- select_frame (get_current_frame (), 0);
- value_zero
- = catch_errors (breakpoint_cond_eval, b->cond,
- "Error occurred in testing breakpoint condition.");
- free_all_values ();
- }
- if (b->cond && value_zero)
- {
- cont = -1;
- }
- else if (b->ignore_count > 0)
- {
- b->ignore_count--;
- cont = -1;
- }
- else
+ CORE_ADDR pc = read_register (PC_REGNUM);
+ CORE_ADDR npc = read_register (NPC_REGNUM);
+ if (pc != npc)
{
- if (b->enable == temporary)
- b->enable = disabled;
- breakpoint_commands = b->commands;
- if (b->silent
- || (breakpoint_commands
- && !strcmp ("silent", breakpoint_commands->line)))
- {
- if (breakpoint_commands)
- breakpoint_commands = breakpoint_commands->next;
- return (b->number > 0 ?
- 0x1000000 + b->number :
- b->number - 0x1000000);
- }
- return b->number;
+ write_register (NNPC_REGNUM, npc);
+ write_register (NPC_REGNUM, pc);
}
}
- }
+#else /* No SHIFT_INST_REGS. */
+ write_pc (bp_addr);
+#endif /* No SHIFT_INST_REGS. */
+ }
+#endif /* DECR_PC_AFTER_BREAK != 0. */
+ }
+ return bs;
+}
- return cont;
+int
+bpstat_should_step ()
+{
+ struct breakpoint *b;
+ ALL_BREAKPOINTS (b)
+ if (b->enable != disabled && b->exp != NULL)
+ return 1;
+ return 0;
}
\f
+/* Print information on breakpoint number BNUM, or -1 if all.
+ If WATCHPOINTS is zero, process only breakpoints; if WATCHPOINTS
+ is nonzero, process only watchpoints. */
+
static void
-breakpoint_1 (bnum)
+breakpoint_1 (bnum, watchpoints)
int bnum;
+ int watchpoints;
{
register struct breakpoint *b;
register struct command_line *l;
register struct symbol *sym;
CORE_ADDR last_addr = (CORE_ADDR)-1;
-
+ int header_printed = 0;
+
ALL_BREAKPOINTS (b)
if (bnum == -1 || bnum == b->number)
{
- printf_filtered ("#%-3d %c 0x%08x ", b->number,
- "nyod"[(int) b->enable],
- b->address);
- last_addr = b->address;
- if (b->symtab)
+ if (b->address == NULL && !watchpoints)
{
- sym = find_pc_function (b->address);
- if (sym)
- printf_filtered (" in %s (%s line %d)", SYMBOL_NAME (sym),
- b->symtab->filename, b->line_number);
- else
- printf_filtered ("%s line %d", b->symtab->filename, b->line_number);
+ if (bnum == -1)
+ continue;
+ error ("That is a watchpoint, not a breakpoint.");
}
- else
+ if (b->address != NULL && watchpoints)
{
- char *name;
- int addr;
+ if (bnum == -1)
+ continue;
+ error ("That is a breakpoint, not a watchpoint.");
+ }
+
+ if (!header_printed)
+ {
+ if (watchpoints)
+ printf_filtered (" Enb Expression\n");
+ else if (addressprint)
+ printf_filtered (" Enb Address Where\n");
+ else
+ printf_filtered (" Enb Where\n");
+ header_printed = 1;
+ }
+
+ printf_filtered ("#%-3d %c ", b->number, "nyod"[(int) b->enable]);
+ if (b->address == NULL) {
+ printf_filtered (" ");
+ print_expression (b->exp, stdout);
+ } else {
+ if (addressprint)
+ printf_filtered (" %s ", local_hex_string_custom(b->address, "08"));
- if (find_pc_partial_function (b->address, &name, &addr))
+ last_addr = b->address;
+ if (b->symtab)
{
- if (b->address - addr)
- printf_filtered ("<%s+%d>", name, b->address - addr);
- else
- printf_filtered ("<%s>", name);
+ sym = find_pc_function (b->address);
+ if (sym)
+ {
+ fputs_filtered (" in ", stdout);
+ fputs_demangled (SYMBOL_NAME (sym), stdout, 1);
+ fputs_filtered (" at ", stdout);
+ }
+ fputs_filtered (b->symtab->filename, stdout);
+ printf_filtered (":%d", b->line_number);
}
+ else
+ print_address_symbolic (b->address, stdout, demangle, " ");
}
-
+
printf_filtered ("\n");
- if (b->ignore_count)
- printf_filtered ("\tignore next %d hits\n", b->ignore_count);
if (b->frame)
- printf_filtered ("\tstop only in stack frame at 0x%x\n", b->frame);
+ printf_filtered ("\tstop only in stack frame at %s\n",
+ local_hex_string(b->frame));
if (b->cond)
{
- printf_filtered ("\tbreak only if ");
+ printf_filtered ("\tstop only if ");
print_expression (b->cond, stdout);
printf_filtered ("\n");
}
- if (l = b->commands)
+ if (b->ignore_count)
+ printf_filtered ("\tignore next %d hits\n", b->ignore_count);
+ if ((l = b->commands))
while (l)
{
- printf_filtered ("\t%s\n", l->line);
+ fputs_filtered ("\t", stdout);
+ fputs_filtered (l->line, stdout);
+ fputs_filtered ("\n", stdout);
l = l->next;
}
}
+ if (!header_printed)
+ {
+ char *which = watchpoints ? "watch" : "break";
+ if (bnum == -1)
+ printf_filtered ("No %spoints.\n", which);
+ else
+ printf_filtered ("No %spoint numbered %d.\n", which, bnum);
+ }
+
/* 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)
set_next_address (last_addr);
}
+/* ARGSUSED */
static void
-breakpoints_info (bnum_exp)
+breakpoints_info (bnum_exp, from_tty)
char *bnum_exp;
+ int from_tty;
{
int bnum = -1;
if (bnum_exp)
bnum = parse_and_eval_address (bnum_exp);
- else if (breakpoint_chain == 0)
- printf_filtered ("No breakpoints.\n");
- else
- printf_filtered ("Breakpoints:\n\
-Num Enb Address Where\n");
- breakpoint_1 (bnum);
+ breakpoint_1 (bnum, 0);
+}
+
+/* ARGSUSED */
+static void
+watchpoints_info (bnum_exp, from_tty)
+ char *bnum_exp;
+ int from_tty;
+{
+ int bnum = -1;
+
+ if (bnum_exp)
+ bnum = parse_and_eval_address (bnum_exp);
+
+ breakpoint_1 (bnum, 1);
}
/* Print a message describing any breakpoints set at PC. */
(b->enable == disabled) ? " (disabled)" : "",
(others > 1) ? "," : ((others == 1) ? " and" : ""));
}
- printf ("also set at pc 0x%x.\n", pc);
+ printf ("also set at pc %s.\n", local_hex_string(pc));
}
}
\f
register struct breakpoint *b;
register int count = 0;
+ if (address == NULL) /* Watchpoints are uninteresting */
+ return;
+
ALL_BREAKPOINTS (b)
if (b->enable != disabled && b->address == address)
{
Takes as args the three things that every breakpoint must have.
Returns the breakpoint object so caller can set other things.
Does not set the breakpoint number!
- Does not print anything. */
+ Does not print anything.
+
+ ==> This routine should not be called if there is a chance of later
+ error(); otherwise it leaves a bogus breakpoint on the chain. Validate
+ your arguments BEFORE calling this routine! */
static struct breakpoint *
set_raw_breakpoint (sal)
b->enable = enabled;
b->next = 0;
b->silent = 0;
+ b->ignore_count = 0;
+ b->commands = NULL;
+ b->frame = NULL;
/* 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
+ b1 = breakpoint_chain;
+ if (b1 == 0)
+ breakpoint_chain = b;
+ else
+ {
+ while (b1->next)
+ b1 = b1->next;
+ b1->next = b;
+ }
+
+ check_duplicates (sal.pc);
+
+ return 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. */
+
+void
+set_momentary_breakpoint (sal, frame)
+ struct symtab_and_line sal;
+ FRAME frame;
+{
+ register struct breakpoint *b;
+ b = set_raw_breakpoint (sal);
+ b->number = -3;
+ b->enable = delete;
+ b->frame = (frame ? FRAME_FP (frame) : 0);
+}
+
+void
+clear_momentary_breakpoints ()
+{
+ register struct breakpoint *b;
+ ALL_BREAKPOINTS (b)
+ if (b->number == -3)
+ {
+ delete_breakpoint (b);
+ break;
+ }
+}
+\f
+/* Tell the user we have just set a breakpoint B. */
+static void
+mention (b)
+ struct breakpoint *b;
+{
+ if (b->exp)
+ {
+ printf_filtered ("Watchpoint %d: ", b->number);
+ print_expression (b->exp, stdout);
+ }
+ else
+ {
+ printf_filtered ("Breakpoint %d at %s", b->number,
+ local_hex_string(b->address));
+ if (b->symtab)
+ printf_filtered (": file %s, line %d.",
+ b->symtab->filename, b->line_number);
+ }
+ printf_filtered ("\n");
+}
+
+#if 0
+/* Nobody calls this currently. */
+/* Set a breakpoint from a symtab and line.
+ If TEMPFLAG is nonzero, it is a temporary breakpoint.
+ ADDR_STRING is a malloc'd string holding the name of where we are
+ setting the breakpoint. This is used later to re-set it after the
+ program is relinked and symbols are reloaded.
+ Print the same confirmation messages that the breakpoint command prints. */
+
+void
+set_breakpoint (s, line, tempflag, addr_string)
+ struct symtab *s;
+ int line;
+ int tempflag;
+ char *addr_string;
+{
+ register struct breakpoint *b;
+ struct symtab_and_line sal;
+
+ sal.symtab = s;
+ sal.line = line;
+ sal.pc = find_line_pc (sal.symtab, sal.line);
+ if (sal.pc == 0)
+ error ("No line %d in file \"%s\".\n", sal.line, sal.symtab->filename);
+ else
+ {
+ describe_other_breakpoints (sal.pc);
+
+ b = set_raw_breakpoint (sal);
+ set_breakpoint_count (breakpoint_count + 1);
+ b->number = breakpoint_count;
+ b->cond = 0;
+ b->addr_string = addr_string;
+ if (tempflag)
+ b->enable = temporary;
+
+ mention (b);
+ }
+}
+#endif
+\f
+/* Set a breakpoint according to ARG (function, linenum or *address)
+ and make it temporary if TEMPFLAG is nonzero. */
+
+static void
+break_command_1 (arg, tempflag, from_tty)
+ char *arg;
+ int tempflag, from_tty;
+{
+ struct symtabs_and_lines sals;
+ struct symtab_and_line sal;
+ register struct expression *cond = 0;
+ register struct breakpoint *b;
+
+ /* Pointers in arg to the start, and one past the end, of the condition. */
+ char *cond_start = NULL;
+ char *cond_end;
+ /* Pointers in arg to the start, and one past the end,
+ of the address part. */
+ char *addr_start = NULL;
+ char *addr_end;
+
+ int i;
+ CORE_ADDR pc;
+
+ sals.sals = NULL;
+ sals.nelts = 0;
+
+ sal.line = sal.pc = sal.end = 0;
+ sal.symtab = 0;
+
+ /* If no arg given, or if first arg is 'if ', use the default breakpoint. */
+
+ if (!arg || (arg[0] == 'i' && arg[1] == 'f'
+ && (arg[2] == ' ' || arg[2] == '\t')))
+ {
+ if (default_breakpoint_valid)
+ {
+ 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;
+ sals.sals[0] = sal;
+ sals.nelts = 1;
+ }
+ else
+ error ("No default breakpoint address now.");
+ }
+ else
+ {
+ addr_start = arg;
+
+ /* 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. */
+ if (default_breakpoint_valid
+ && (!current_source_symtab
+ || (arg && (*arg == '+' || *arg == '-'))))
+ sals = decode_line_1 (&arg, 1, default_breakpoint_symtab,
+ default_breakpoint_line);
+ else
+ sals = decode_line_1 (&arg, 1, (struct symtab *)NULL, 0);
+
+ addr_end = arg;
+ }
+
+ if (! sals.nelts)
+ return;
+
+ for (i = 0; i < sals.nelts; i++)
+ {
+ sal = sals.sals[i];
+ if (sal.pc == 0 && sal.symtab != 0)
+ {
+ pc = find_line_pc (sal.symtab, sal.line);
+ if (pc == 0)
+ error ("No line %d in file \"%s\".",
+ sal.line, sal.symtab->filename);
+ }
+ else
+ pc = sal.pc;
+
+ while (arg && *arg)
+ {
+ if (arg[0] == 'i' && arg[1] == 'f'
+ && (arg[2] == ' ' || arg[2] == '\t'))
+ {
+ arg += 2;
+ cond_start = arg;
+ cond = parse_exp_1 (&arg, block_for_pc (pc), 0);
+ cond_end = arg;
+ }
+ else
+ error ("Junk at end of arguments.");
+ }
+ sals.sals[i].pc = pc;
+ }
+
+ for (i = 0; i < sals.nelts; i++)
+ {
+ sal = sals.sals[i];
+
+ if (from_tty)
+ describe_other_breakpoints (sal.pc);
+
+ b = set_raw_breakpoint (sal);
+ set_breakpoint_count (breakpoint_count + 1);
+ b->number = breakpoint_count;
+ b->cond = cond;
+
+ if (addr_start)
+ b->addr_string = savestring (addr_start, addr_end - addr_start);
+ if (cond_start)
+ b->cond_string = savestring (cond_start, cond_end - cond_start);
+
+ if (tempflag)
+ b->enable = temporary;
+
+ mention (b);
+ }
+
+ if (sals.nelts > 1)
+ {
+ printf ("Multiple breakpoints were set.\n");
+ printf ("Use the \"delete\" command to delete unwanted breakpoints.\n");
+ }
+ free (sals.sals);
+}
+
+void
+break_command (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ break_command_1 (arg, 0, from_tty);
+}
+
+static void
+tbreak_command (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ break_command_1 (arg, 1, from_tty);
+}
+
+/* ARGSUSED */
+static void
+watch_command (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ struct breakpoint *b;
+ struct symtab_and_line sal;
+ struct expression *exp;
+ struct block *exp_valid_block;
+ struct value *val;
+
+ sal.pc = NULL;
+ sal.symtab = NULL;
+ sal.line = 0;
+
+ /* Parse arguments. */
+ innermost_block = NULL;
+ exp = parse_expression (arg);
+ exp_valid_block = innermost_block;
+ val = evaluate_expression (exp);
+ release_value (val);
+
+ /* Now set up the breakpoint. */
+ b = set_raw_breakpoint (sal);
+ set_breakpoint_count (breakpoint_count + 1);
+ b->number = breakpoint_count;
+ b->exp = exp;
+ b->exp_valid_block = exp_valid_block;
+ b->val = val;
+ b->cond = 0;
+ b->cond_string = NULL;
+ mention (b);
+}
+\f
+/*
+ * Helper routine for the until_command routine in infcmd.c. Here
+ * because it uses the mechanisms of breakpoints.
+ */
+/* ARGSUSED */
+void
+until_break_command (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ struct symtabs_and_lines sals;
+ struct symtab_and_line sal;
+ FRAME prev_frame = get_prev_frame (selected_frame);
+
+ 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);
+ else
+ sals = decode_line_1 (&arg, 1, (struct symtab *)NULL, 0);
+
+ if (sals.nelts != 1)
+ error ("Couldn't get information on specified line.");
+
+ sal = sals.sals[0];
+ free (sals.sals); /* malloc'd, so freed */
+
+ if (*arg)
+ error ("Junk at end of arguments.");
+
+ if (sal.pc == 0 && sal.symtab != 0)
+ sal.pc = find_line_pc (sal.symtab, sal.line);
+
+ if (sal.pc == 0)
+ error ("No line %d in file \"%s\".", sal.line, sal.symtab->filename);
+
+ set_momentary_breakpoint (sal, selected_frame);
+
+ /* Keep within the current frame */
+
+ if (prev_frame)
+ {
+ struct frame_info *fi;
+
+ fi = get_frame_info (prev_frame);
+ sal = find_pc_line (fi->pc, 0);
+ sal.pc = fi->pc;
+ set_momentary_breakpoint (sal, prev_frame);
+ }
+
+ proceed (-1, -1, 0);
+}
+\f
+#if 0
+/* These aren't used; I don't konw what they were for. */
+/* Set a breakpoint at the catch clause for NAME. */
+static int
+catch_breakpoint (name)
+ char *name;
+{
+}
+
+static int
+disable_catch_breakpoint ()
+{
+}
+
+static int
+delete_catch_breakpoint ()
+{
+}
+
+static int
+enable_catch_breakpoint ()
+{
+}
+#endif /* 0 */
+
+struct sal_chain
+{
+ struct sal_chain *next;
+ struct symtab_and_line sal;
+};
+
+#if 0
+/* This isn't used; I don't know what it was for. */
+/* For each catch clause identified in ARGS, run FUNCTION
+ with that clause as an argument. */
+static struct symtabs_and_lines
+map_catch_names (args, function)
+ char *args;
+ int (*function)();
+{
+ register char *p = args;
+ register char *p1;
+ struct symtabs_and_lines sals;
+#if 0
+ struct sal_chain *sal_chain = 0;
+#endif
+
+ if (p == 0)
+ error_no_arg ("one or more catch names");
+
+ sals.nelts = 0;
+ sals.sals = NULL;
+
+ while (*p)
{
- while (b1->next)
- b1 = b1->next;
- b1->next = b;
- }
+ p1 = p;
+ /* Don't swallow conditional part. */
+ if (p1[0] == 'i' && p1[1] == 'f'
+ && (p1[2] == ' ' || p1[2] == '\t'))
+ break;
- check_duplicates (sal.pc);
+ if (isalpha (*p1))
+ {
+ p1++;
+ while (isalnum (*p1) || *p1 == '_' || *p1 == '$')
+ p1++;
+ }
- return b;
+ if (*p1 && *p1 != ' ' && *p1 != '\t')
+ error ("Arguments must be catch names.");
+
+ *p1 = 0;
+#if 0
+ if (function (p))
+ {
+ struct sal_chain *next
+ = (struct sal_chain *)alloca (sizeof (struct sal_chain));
+ next->next = sal_chain;
+ next->sal = get_catch_sal (p);
+ sal_chain = next;
+ goto win;
+ }
+#endif
+ printf ("No catch clause for exception %s.\n", p);
+#if 0
+ win:
+#endif
+ p = p1;
+ while (*p == ' ' || *p == '\t') p++;
+ }
}
+#endif /* 0 */
-/* Set a breakpoint that will evaporate an end of command
- at address specified by SAL.
- Restrict it to frame FRAME if FRAME is nonzero. */
+/* This shares a lot of code with `print_frame_label_vars' from stack.c. */
-void
-set_momentary_breakpoint (sal, frame)
- struct symtab_and_line sal;
- FRAME frame;
+static struct symtabs_and_lines
+get_catch_sals (this_level_only)
+ int this_level_only;
{
- register struct breakpoint *b;
- b = set_raw_breakpoint (sal);
- b->number = -3;
- b->enable = delete;
- b->frame = (frame ? FRAME_FP (frame) : 0);
-}
+ extern struct blockvector *blockvector_for_pc ();
+ register struct blockvector *bl;
+ register struct block *block;
+ int index, have_default = 0;
+ struct frame_info *fi;
+ CORE_ADDR pc;
+ struct symtabs_and_lines sals;
+ struct sal_chain *sal_chain = 0;
+ char *blocks_searched;
-void
-clear_momentary_breakpoints ()
-{
- register struct breakpoint *b;
- ALL_BREAKPOINTS (b)
- if (b->number == -3)
- {
- delete_breakpoint (b);
- break;
- }
-}
-\f
-/* Set a breakpoint from a symtab and line.
- If TEMPFLAG is nonzero, it is a temporary breakpoint.
- Print the same confirmation messages that the breakpoint command prints. */
+ /* Not sure whether an error message is always the correct response,
+ but it's better than a core dump. */
+ if (selected_frame == NULL)
+ error ("No selected frame.");
+ block = get_frame_block (selected_frame);
+ fi = get_frame_info (selected_frame);
+ pc = fi->pc;
-void
-set_breakpoint (s, line, tempflag)
- struct symtab *s;
- int line;
- int tempflag;
-{
- register struct breakpoint *b;
- struct symtab_and_line sal;
-
- sal.symtab = s;
- sal.line = line;
- sal.pc = find_line_pc (sal.symtab, sal.line);
- if (sal.pc == 0)
- error ("No line %d in file \"%s\".\n", sal.line, sal.symtab->filename);
- else
+ sals.nelts = 0;
+ sals.sals = NULL;
+
+ if (block == 0)
+ error ("No symbol table info available.\n");
+
+ bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
+ blocks_searched = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
+ bzero (blocks_searched, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
+
+ while (block != 0)
{
- describe_other_breakpoints (sal.pc);
+ CORE_ADDR end = BLOCK_END (block) - 4;
+ int last_index;
+
+ if (bl != blockvector_for_pc (end, &index))
+ error ("blockvector blotch");
+ if (BLOCKVECTOR_BLOCK (bl, index) != block)
+ error ("blockvector botch");
+ last_index = BLOCKVECTOR_NBLOCKS (bl);
+ index += 1;
+
+ /* Don't print out blocks that have gone by. */
+ while (index < last_index
+ && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
+ index++;
+
+ while (index < last_index
+ && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
+ {
+ if (blocks_searched[index] == 0)
+ {
+ struct block *b = BLOCKVECTOR_BLOCK (bl, index);
+ int nsyms;
+ register int i;
+ register struct symbol *sym;
+
+ nsyms = BLOCK_NSYMS (b);
+
+ for (i = 0; i < nsyms; i++)
+ {
+ sym = BLOCK_SYM (b, i);
+ if (! strcmp (SYMBOL_NAME (sym), "default"))
+ {
+ if (have_default)
+ continue;
+ have_default = 1;
+ }
+ if (SYMBOL_CLASS (sym) == LOC_LABEL)
+ {
+ struct sal_chain *next = (struct sal_chain *)
+ alloca (sizeof (struct sal_chain));
+ next->next = sal_chain;
+ next->sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
+ sal_chain = next;
+ }
+ }
+ blocks_searched[index] = 1;
+ }
+ index++;
+ }
+ if (have_default)
+ break;
+ if (sal_chain && this_level_only)
+ break;
- b = set_raw_breakpoint (sal);
- b->number = ++breakpoint_count;
- b->cond = 0;
- if (tempflag)
- b->enable = temporary;
+ /* After handling the function's top-level block, stop.
+ Don't continue to its superblock, the block of
+ per-file symbols. */
+ if (BLOCK_FUNCTION (block))
+ break;
+ block = BLOCK_SUPERBLOCK (block);
+ }
- printf ("Breakpoint %d at 0x%x", b->number, b->address);
- if (b->symtab)
- printf (": file %s, line %d.", b->symtab->filename, b->line_number);
- printf ("\n");
+ if (sal_chain)
+ {
+ struct sal_chain *tmp_chain;
+
+ /* Count the number of entries. */
+ for (index = 0, tmp_chain = sal_chain; tmp_chain;
+ tmp_chain = tmp_chain->next)
+ index++;
+
+ sals.nelts = index;
+ sals.sals = (struct symtab_and_line *)
+ xmalloc (index * sizeof (struct symtab_and_line));
+ for (index = 0; sal_chain; sal_chain = sal_chain->next, index++)
+ sals.sals[index] = sal_chain->sal;
}
+
+ return sals;
}
-\f
-/* Set a breakpoint according to ARG (function, linenum or *address)
- and make it temporary if TEMPFLAG is nonzero. */
-static void
-break_command_1 (arg, tempflag, from_tty)
+/* Commands to deal with catching exceptions. */
+
+void
+catch_command_1 (arg, tempflag, from_tty)
char *arg;
- int tempflag, from_tty;
+ int tempflag;
+ int from_tty;
{
+ /* First, translate ARG into something we can deal with in terms
+ of breakpoints. */
+
struct symtabs_and_lines sals;
struct symtab_and_line sal;
register struct expression *cond = 0;
int i;
CORE_ADDR pc;
- sals.sals = NULL;
- sals.nelts = 0;
-
sal.line = sal.pc = sal.end = 0;
sal.symtab = 0;
- /* If no arg given, or if first arg is 'if ', use the default breakpoint. */
+ /* If no arg given, or if first arg is 'if ', all active catch clauses
+ are breakpointed. */
if (!arg || (arg[0] == 'i' && arg[1] == 'f'
&& (arg[2] == ' ' || arg[2] == '\t')))
{
- if (default_breakpoint_valid)
- {
- sals.sals = (struct symtab_and_line *)
- malloc (sizeof (struct symtab_and_line));
- sal.pc = default_breakpoint_address;
- sal.line = default_breakpoint_line;
- sal.symtab = default_breakpoint_symtab;
- sals.sals[0] = sal;
- sals.nelts = 1;
- }
- else
- error ("No default breakpoint address now.");
+ /* Grab all active catch clauses. */
+ sals = get_catch_sals (0);
}
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. */
- if (default_breakpoint_valid
- && (!current_source_symtab
- || (arg && (*arg == '+' || *arg == '-'))))
- sals = decode_line_1 (&arg, 1, default_breakpoint_symtab,
- default_breakpoint_line);
- else
- sals = decode_line_1 (&arg, 1, 0, 0);
-
+ {
+ /* Grab selected catch clauses. */
+ error ("catch NAME not implemeneted");
+#if 0
+ /* This isn't used; I don't know what it was for. */
+ sals = map_catch_names (arg, catch_breakpoint);
+#endif
+ }
+
if (! sals.nelts)
return;
{
if (arg[0] == 'i' && arg[1] == 'f'
&& (arg[2] == ' ' || arg[2] == '\t'))
- cond = (struct expression *) parse_c_1 ((arg += 2, &arg),
+ cond = (struct expression *) parse_exp_1 ((arg += 2, &arg),
block_for_pc (pc), 0);
else
error ("Junk at end of arguments.");
if (tempflag)
b->enable = temporary;
- printf ("Breakpoint %d at 0x%x", b->number, b->address);
+ printf ("Breakpoint %d at %s", b->number, local_hex_string(b->address));
if (b->symtab)
printf (": file %s, line %d.", b->symtab->filename, b->line_number);
printf ("\n");
free (sals.sals);
}
+#if 0
+/* These aren't used; I don't know what they were for. */
+/* Disable breakpoints on all catch clauses described in ARGS. */
static void
-break_command (arg, from_tty)
- char *arg;
- int from_tty;
+disable_catch (args)
+ char *args;
{
- break_command_1 (arg, 0, from_tty);
+ /* Map the disable command to catch clauses described in ARGS. */
}
+/* Enable breakpoints on all catch clauses described in ARGS. */
static void
-tbreak_command (arg, from_tty)
- char *arg;
- int from_tty;
+enable_catch (args)
+ char *args;
{
- break_command_1 (arg, 1, from_tty);
+ /* Map the disable command to catch clauses described in ARGS. */
}
-\f
-/*
- * Helper routine for the until_command routine in infcmd.c. Here
- * because it uses the mechanisms of breakpoints.
- */
-void
-until_break_command (arg, from_tty)
+
+/* Delete breakpoints on all catch clauses in the active scope. */
+static void
+delete_catch (args)
+ char *args;
+{
+ /* Map the delete command to catch clauses described in ARGS. */
+}
+#endif /* 0 */
+
+static void
+catch_command (arg, from_tty)
char *arg;
int from_tty;
{
- struct symtabs_and_lines sals;
- struct symtab_and_line sal;
- FRAME prev_frame = get_prev_frame (selected_frame);
-
- 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);
- else
- sals = decode_line_1 (&arg, 1, 0, 0);
-
- if (sals.nelts != 1)
- error ("Couldn't get information on specified line.");
-
- sal = sals.sals[0];
- free (sals.sals); /* malloc'd, so freed */
-
- if (*arg)
- error ("Junk at end of arguments.");
-
- if (sal.pc == 0 && sal.symtab != 0)
- sal.pc = find_line_pc (sal.symtab, sal.line);
-
- if (sal.pc == 0)
- error ("No line %d in file \"%s\".", sal.line, sal.symtab->filename);
-
- set_momentary_breakpoint (sal, selected_frame);
-
- /* Keep within the current frame */
-
- if (prev_frame)
- {
- struct frame_info *fi;
-
- fi = get_frame_info (prev_frame);
- sal = find_pc_line (fi->pc, 0);
- sal.pc = fi->pc;
- set_momentary_breakpoint (sal, prev_frame);
- }
-
- proceed (-1, -1, 0);
+ catch_command_1 (arg, 0, from_tty);
}
\f
static void
}
else
{
- sals.sals = (struct symtab_and_line *) malloc (sizeof (struct symtab_and_line));
+ sals.sals = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line));
sal.line = default_breakpoint_line;
sal.symtab = default_breakpoint_symtab;
sal.pc = 0;
ALL_BREAKPOINTS (b)
while (b->next
+ && b->next->address != NULL
&& (sal.pc ? b->next->address == sal.pc
: (b->next->symtab == sal.symtab
&& b->next->line_number == sal.line)))
}
if (found == 0)
- error ("No breakpoint at %s.", arg);
+ {
+ if (arg)
+ error ("No breakpoint at %s.", arg);
+ else
+ error ("No breakpoint at this line.");
+ }
if (found->next) from_tty = 1; /* Always report if deleted more than one */
if (from_tty) printf ("Deleted breakpoint%s ", found->next ? "s" : "");
free (sals.sals);
}
\f
-/* Delete breakpoint number BNUM if it is a `delete' breakpoint.
- This is called after breakpoint BNUM has been hit.
- Also delete any breakpoint numbered -3 unless there are breakpoint
- commands to be executed. */
+/* Delete breakpoint in BS if they are `delete' breakpoints.
+ This is called after any breakpoint is hit, or after errors. */
void
-breakpoint_auto_delete (bnum)
- int bnum;
+breakpoint_auto_delete (bs)
+ bpstat bs;
{
- register struct breakpoint *b;
- if (bnum != 0)
- ALL_BREAKPOINTS (b)
- if (b->number == bnum)
- {
- if (b->enable == delete)
- delete_breakpoint (b);
- break;
- }
- if (breakpoint_commands == 0)
- clear_momentary_breakpoints ();
+ for (; bs; bs = bs->next)
+ if (bs->breakpoint_at && bs->breakpoint_at->enable == delete)
+ delete_breakpoint (bs->breakpoint_at);
}
+/* Delete a breakpoint and clean up all traces of it in the data structures. */
+
static void
delete_breakpoint (bpt)
struct breakpoint *bpt;
{
register struct breakpoint *b;
+ register bpstat bs;
if (bpt->inserted)
- write_memory (bpt->address, bpt->shadow_contents, sizeof break_insn);
+ target_remove_breakpoint(bpt->address, bpt->shadow_contents);
if (breakpoint_chain == bpt)
breakpoint_chain = bpt->next;
free_command_lines (&bpt->commands);
if (bpt->cond)
free (bpt->cond);
+ if (bpt->cond_string != NULL)
+ free (bpt->cond_string);
+ if (bpt->addr_string != NULL)
+ free (bpt->addr_string);
if (xgdb_verbose && bpt->number >=0)
printf ("breakpoint #%d deleted\n", bpt->number);
+ /* 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. */
+ for (bs = stop_bpstat; bs; bs = bs->next)
+ if (bs->breakpoint_at == bpt)
+ bs->breakpoint_at = NULL;
free (bpt);
}
char *arg;
int from_tty;
{
- register struct breakpoint *b, *b1;
if (arg == 0)
{
/* Ask user only if there are some breakpoints to delete. */
if (!from_tty
- || breakpoint_chain && query ("Delete all breakpoints? "))
+ || (breakpoint_chain && query ("Delete all breakpoints? ", 0, 0)))
{
/* No arg; clear all breakpoints. */
while (breakpoint_chain)
map_breakpoint_numbers (arg, delete_breakpoint);
}
-/* Delete all breakpoints.
- Done when new symtabs are loaded, since the break condition expressions
- may become invalid, and the breakpoints are probably wrong anyway. */
+/* 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 (bint)
+ char *bint;
+{
+ struct breakpoint *b = (struct breakpoint *)bint; /* get past catch_errs */
+ int i;
+ struct symtabs_and_lines sals;
+ struct symtab_and_line sal;
+ char *s;
+
+ if (b->address != NULL && b->addr_string != NULL)
+ {
+ s = b->addr_string;
+ sals = decode_line_1 (&s, 1, (struct symtab *)NULL, 0);
+ for (i = 0; i < sals.nelts; i++)
+ {
+ sal = sals.sals[i];
+
+ b->symtab = sal.symtab;
+ b->line_number = sal.line;
+ if (sal.pc == 0 && sal.symtab != 0)
+ {
+ sal.pc = find_line_pc (sal.symtab, sal.line);
+ if (sal.pc == 0)
+ error ("No line %d in file \"%s\".",
+ sal.line, sal.symtab->filename);
+ }
+ b->address = sal.pc;
+
+ if (b->cond_string != NULL)
+ {
+ s = b->cond_string;
+ b->cond = parse_exp_1 (&s, block_for_pc (sal.pc), 0);
+ }
+
+ check_duplicates (b->address);
+
+ mention (b);
+ }
+ free (sals.sals);
+ }
+ else
+ {
+ /* Anything without a string can't be re-set. */
+ delete_breakpoint (b);
+ }
+ return 0;
+}
+/* Re-set all breakpoints after symbols have been re-loaded. */
void
-clear_breakpoints ()
+breakpoint_re_set ()
{
- delete_command (0, 0);
+ struct breakpoint *b;
+
+ ALL_BREAKPOINTS (b)
+ {
+ b->symtab = 0; /* Be sure we don't point to old dead symtab */
+ (void) catch_errors (breakpoint_re_set_one, (char *) b,
+ "Error in re-setting breakpoint:\n");
+ }
+
+ /* Blank line to finish off all those mention() messages we just printed. */
+ printf_filtered ("\n");
}
\f
/* Set ignore-count of breakpoint number BPTNUM to COUNT.
char *args;
int from_tty;
{
- register char *p = args;
+ char *p = args;
register int num;
if (p == 0)
error_no_arg ("a breakpoint number");
- while (*p >= '0' && *p <= '9') p++;
- if (*p && *p != ' ' && *p != '\t')
- error ("First argument must be a breakpoint number.");
-
- num = atoi (args);
+ num = get_number (&p);
if (*p == 0)
error ("Second argument (specified ignore-count) is missing.");
- set_ignore_count (num, parse_and_eval_address (p), from_tty);
+ set_ignore_count (num,
+ longest_to_int (value_as_long (parse_and_eval (p))),
+ from_tty);
printf ("\n");
}
\f
void (*function) ();
{
register char *p = args;
- register char *p1;
+ char *p1;
register int num;
register struct breakpoint *b;
while (*p)
{
p1 = p;
- while (*p1 >= '0' && *p1 <= '9') p1++;
- if (*p1 && *p1 != ' ' && *p1 != '\t')
- error ("Arguments must be breakpoint numbers.");
-
- num = atoi (p);
+
+ num = get_number (&p1);
ALL_BREAKPOINTS (b)
if (b->number == num)
printf ("No breakpoint number %d.\n", num);
win:
p = p1;
- while (*p == ' ' || *p == '\t') p++;
}
}
printf ("breakpoint #%d enabled\n", bpt->number);
check_duplicates (bpt->address);
+ if (bpt->val != NULL)
+ {
+ if (bpt->exp_valid_block != NULL
+ && !contained_in (get_selected_block (), bpt->exp_valid_block))
+ {
+ 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;
+ }
+
+ value_free (bpt->val);
+
+ bpt->val = evaluate_expression (bpt->exp);
+ release_value (bpt->val);
+ }
}
+/* ARGSUSED */
static void
-enable_command (args)
+enable_command (args, from_tty)
char *args;
+ int from_tty;
{
struct breakpoint *bpt;
if (args == 0)
check_duplicates (bpt->address);
}
+/* ARGSUSED */
static void
-disable_command (args)
+disable_command (args, from_tty)
char *args;
+ int from_tty;
{
register struct breakpoint *bpt;
if (args == 0)
check_duplicates (bpt->address);
}
+/* ARGSUSED */
static void
-enable_once_command (args)
+enable_once_command (args, from_tty)
char *args;
+ int from_tty;
{
map_breakpoint_numbers (args, enable_once_breakpoint);
}
check_duplicates (bpt->address);
}
+/* ARGSUSED */
static void
-enable_delete_command (args)
+enable_delete_command (args, from_tty)
char *args;
+ int from_tty;
{
map_breakpoint_numbers (args, enable_delete_breakpoint);
}
sals = decode_line_1 (&string, funfirstline,
default_breakpoint_symtab, default_breakpoint_line);
else
- sals = decode_line_1 (&string, funfirstline, 0, 0);
+ sals = decode_line_1 (&string, funfirstline, (struct symtab *)NULL, 0);
if (*string)
error ("Junk at end of line specification: %s", string);
return sals;
_initialize_breakpoint ()
{
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,
add_com ("condition", class_breakpoint, condition_command,
"Specify breakpoint number N to break only if COND is true.\n\
-N is an integer; COND is a C expression to be evaluated whenever\n\
-breakpoint N is reached. Actually break only when COND is nonzero.");
+N is an integer; COND is an expression to be evaluated whenever\n\
+breakpoint N is reached. ");
add_com ("tbreak", class_breakpoint, tbreak_command,
"Set a temporary breakpoint. Args like \"break\" command.\n\
by using \"enable once\" on the breakpoint number.");
add_prefix_cmd ("enable", class_breakpoint, enable_command,
- "Enable some breakpoints or auto-display expressions.\n\
+ "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.\n\
-\n\
-The \"display\" subcommand applies to auto-displays instead of breakpoints.",
+With a subcommand you can enable temporarily.",
&enablelist, "enable ", 1, &cmdlist);
add_abbrev_prefix_cmd ("breakpoints", class_breakpoint, enable_command,
- "Enable some breakpoints or auto-display expressions.\n\
+ "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\
-May be abbreviates to simply \"enable\".\n\
-With a subcommand you can enable temporarily.",
+May be abbreviated to simply \"enable\".\n",
&enablebreaklist, "enable breakpoints ", 1, &enablelist);
add_cmd ("once", no_class, enable_once_command,
&enablelist);
add_prefix_cmd ("disable", class_breakpoint, disable_command,
- "Disable some breakpoints or auto-display expressions.\n\
+ "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\
-\n\
-The \"display\" subcommand applies to auto-displays instead of breakpoints.",
+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);
- add_abbrev_cmd ("breakpoints", class_breakpoint, disable_command,
- "Disable some breakpoints or auto-display expressions.\n\
+ 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\
The \"unset\" command is also an alias for \"delete\".",
&deletelist, "delete ", 1, &cmdlist);
add_com_alias ("d", "delete", class_breakpoint, 1);
- add_com_alias ("unset", "delete", class_alias, 1);
add_cmd ("breakpoints", class_alias, delete_command,
"Delete some breakpoints or auto-display expressions.\n\
\"o\" for enabled once (disable when hit), \"d\" for enable but delete when hit.\n\
Then come the address and the file/line number.\n\n\
Convenience variable \"$_\" and default examine address for \"x\"\n\
-are set to the address of the last breakpoint listed.");
-}
+are set to the address of the last breakpoint listed.\n\n\
+Convenience variable \"$bpnum\" contains the number of the last\n\
+breakpoint set.");
+
+ add_com ("catch", class_breakpoint, catch_command,
+ "Set breakpoints to catch exceptions that are raised.\n\
+Argument may be a single exception to catch, multiple exceptions\n\
+to catch, or the default exception \"default\". If no arguments\n\
+are given, breakpoints are set at all exception handlers catch clauses\n\
+within the current scope.\n\
+\n\
+A condition specified for the catch applies to all breakpoints set\n\
+with this command\n\
+\n\
+Do \"help breakpoints\" for info on other commands dealing with breakpoints.");
+ 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.");
+
+ add_info ("watchpoints", watchpoints_info,
+ "Status of all watchpoints, or watchpoint number NUMBER.\n\
+Second column is \"y\" for enabled watchpoints, \"n\" for disabled.");
+}
projects / deliverable / binutils-gdb.git / blobdiff