691 lines
25 KiB
C
691 lines
25 KiB
C
/* Data structures associated with breakpoints in GDB.
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Copyright (C) 1992, 93, 94, 95, 96, 98, 1999 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#if !defined (BREAKPOINT_H)
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#define BREAKPOINT_H 1
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#include "frame.h"
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#include "value.h"
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#include "gdb-events.h"
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/* This is the maximum number of bytes a breakpoint instruction can take.
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Feel free to increase it. It's just used in a few places to size
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arrays that should be independent of the target architecture. */
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#define BREAKPOINT_MAX 16
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/* Type of breakpoint. */
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/* FIXME In the future, we should fold all other breakpoint-like things into
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here. This includes:
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* single-step (for machines where we have to simulate single stepping)
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(probably, though perhaps it is better for it to look as much as
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possible like a single-step to wait_for_inferior). */
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enum bptype
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{
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bp_none = 0, /* Eventpoint has been deleted. */
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bp_breakpoint, /* Normal breakpoint */
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bp_hardware_breakpoint, /* Hardware assisted breakpoint */
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bp_until, /* used by until command */
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bp_finish, /* used by finish command */
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bp_watchpoint, /* Watchpoint */
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bp_hardware_watchpoint, /* Hardware assisted watchpoint */
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bp_read_watchpoint, /* read watchpoint, (hardware assisted) */
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bp_access_watchpoint, /* access watchpoint, (hardware assisted) */
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bp_longjmp, /* secret breakpoint to find longjmp() */
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bp_longjmp_resume, /* secret breakpoint to escape longjmp() */
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/* Used by wait_for_inferior for stepping over subroutine calls, for
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stepping over signal handlers, and for skipping prologues. */
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bp_step_resume,
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/* Used by wait_for_inferior for stepping over signal handlers. */
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bp_through_sigtramp,
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/* Used to detect when a watchpoint expression has gone out of
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scope. These breakpoints are usually not visible to the user.
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This breakpoint has some interesting properties:
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1) There's always a 1:1 mapping between watchpoints
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on local variables and watchpoint_scope breakpoints.
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2) It automatically deletes itself and the watchpoint it's
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associated with when hit.
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3) It can never be disabled. */
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bp_watchpoint_scope,
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/* The breakpoint at the end of a call dummy. */
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/* FIXME: What if the function we are calling longjmp()s out of the
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call, or the user gets out with the "return" command? We currently
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have no way of cleaning up the breakpoint in these (obscure) situations.
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(Probably can solve this by noticing longjmp, "return", etc., it's
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similar to noticing when a watchpoint on a local variable goes out
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of scope (with hardware support for watchpoints)). */
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bp_call_dummy,
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/* Some dynamic linkers (HP, maybe Solaris) can arrange for special
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code in the inferior to run when significant events occur in the
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dynamic linker (for example a library is loaded or unloaded).
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By placing a breakpoint in this magic code GDB will get control
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when these significant events occur. GDB can then re-examine
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the dynamic linker's data structures to discover any newly loaded
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dynamic libraries. */
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bp_shlib_event,
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/* Some multi-threaded systems can arrange for a location in the
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inferior to be executed when certain thread-related events occur
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(such as thread creation or thread death).
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By placing a breakpoint at one of these locations, GDB will get
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control when these events occur. GDB can then update its thread
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lists etc. */
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bp_thread_event,
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/* These breakpoints are used to implement the "catch load" command
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on platforms whose dynamic linkers support such functionality. */
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bp_catch_load,
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/* These breakpoints are used to implement the "catch unload" command
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on platforms whose dynamic linkers support such functionality. */
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bp_catch_unload,
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/* These are not really breakpoints, but are catchpoints that
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implement the "catch fork", "catch vfork" and "catch exec" commands
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on platforms whose kernel support such functionality. (I.e.,
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kernels which can raise an event when a fork or exec occurs, as
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opposed to the debugger setting breakpoints on functions named
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"fork" or "exec".) */
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bp_catch_fork,
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bp_catch_vfork,
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bp_catch_exec,
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/* These are catchpoints to implement "catch catch" and "catch throw"
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commands for C++ exception handling. */
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bp_catch_catch,
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bp_catch_throw
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};
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/* States of enablement of breakpoint. */
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enum enable
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{
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disabled, /* The eventpoint is inactive, and cannot trigger. */
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enabled, /* The eventpoint is active, and can trigger. */
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shlib_disabled, /* The eventpoint's address is in an unloaded solib.
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The eventpoint will be automatically enabled
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and reset when that solib is loaded. */
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call_disabled, /* The eventpoint has been disabled while a call
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into the inferior is "in flight", because some
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eventpoints interfere with the implementation of
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a call on some targets. The eventpoint will be
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automatically enabled and reset when the call
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"lands" (either completes, or stops at another
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eventpoint). */
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permanent /* There is a breakpoint instruction hard-wired into
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the target's code. Don't try to write another
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breakpoint instruction on top of it, or restore
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its value. Step over it using the architecture's
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SKIP_INSN macro. */
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};
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/* Disposition of breakpoint. Ie: what to do after hitting it. */
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enum bpdisp
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{
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del, /* Delete it */
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del_at_next_stop, /* Delete at next stop, whether hit or not */
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disable, /* Disable it */
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donttouch /* Leave it alone */
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};
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enum target_hw_bp_type
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{
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hw_write = 0, /* Common HW watchpoint */
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hw_read = 1, /* Read HW watchpoint */
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hw_access = 2, /* Access HW watchpoint */
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hw_execute = 3 /* Execute HW breakpoint */
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};
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/* Note that the ->silent field is not currently used by any commands
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(though the code is in there if it was to be, and set_raw_breakpoint
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does set it to 0). I implemented it because I thought it would be
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useful for a hack I had to put in; I'm going to leave it in because
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I can see how there might be times when it would indeed be useful */
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/* This is for a breakpoint or a watchpoint. */
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struct breakpoint
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{
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struct breakpoint *next;
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/* Type of breakpoint. */
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enum bptype type;
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/* Zero means disabled; remember the info but don't break here. */
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enum enable enable;
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/* What to do with this breakpoint after we hit it. */
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enum bpdisp disposition;
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/* Number assigned to distinguish breakpoints. */
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int number;
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/* Address to break at, or NULL if not a breakpoint. */
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CORE_ADDR address;
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/* Line number of this address. Only matters if address is
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non-NULL. */
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int line_number;
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/* Source file name of this address. Only matters if address is
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non-NULL. */
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char *source_file;
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/* Non-zero means a silent breakpoint (don't print frame info
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if we stop here). */
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unsigned char silent;
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/* Number of stops at this breakpoint that should
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be continued automatically before really stopping. */
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int ignore_count;
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/* "Real" contents of byte where breakpoint has been inserted.
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Valid only when breakpoints are in the program. Under the complete
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control of the target insert_breakpoint and remove_breakpoint routines.
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No other code should assume anything about the value(s) here. */
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char shadow_contents[BREAKPOINT_MAX];
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/* Nonzero if this breakpoint is now inserted. Only matters if address
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is non-NULL. */
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char inserted;
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/* Nonzero if this is not the first breakpoint in the list
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for the given address. Only matters if address is non-NULL. */
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char duplicate;
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/* Chain of command lines to execute when this breakpoint is hit. */
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struct command_line *commands;
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/* Stack depth (address of frame). If nonzero, break only if fp
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equals this. */
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CORE_ADDR frame;
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/* Conditional. Break only if this expression's value is nonzero. */
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struct expression *cond;
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/* String we used to set the breakpoint (malloc'd). Only matters if
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address is non-NULL. */
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char *addr_string;
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/* Language we used to set the breakpoint. */
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enum language language;
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/* Input radix we used to set the breakpoint. */
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int input_radix;
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/* String form of the breakpoint condition (malloc'd), or NULL if there
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is no condition. */
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char *cond_string;
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/* String form of exp (malloc'd), or NULL if none. */
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char *exp_string;
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/* The expression we are watching, or NULL if not a watchpoint. */
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struct expression *exp;
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/* The largest block within which it is valid, or NULL if it is
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valid anywhere (e.g. consists just of global symbols). */
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struct block *exp_valid_block;
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/* Value of the watchpoint the last time we checked it. */
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value_ptr val;
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/* Holds the value chain for a hardware watchpoint expression. */
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value_ptr val_chain;
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/* Holds the address of the related watchpoint_scope breakpoint
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when using watchpoints on local variables (might the concept
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of a related breakpoint be useful elsewhere, if not just call
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it the watchpoint_scope breakpoint or something like that. FIXME). */
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struct breakpoint *related_breakpoint;
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/* Holds the frame address which identifies the frame this watchpoint
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should be evaluated in, or NULL if the watchpoint should be evaluated
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on the outermost frame. */
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CORE_ADDR watchpoint_frame;
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/* Thread number for thread-specific breakpoint, or -1 if don't care */
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int thread;
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/* Count of the number of times this breakpoint was taken, dumped
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with the info, but not used for anything else. Useful for
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seeing how many times you hit a break prior to the program
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aborting, so you can back up to just before the abort. */
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int hit_count;
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/* Filename of a dynamically-linked library (dll), used for
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bp_catch_load and bp_catch_unload (malloc'd), or NULL if any
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library is significant. */
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char *dll_pathname;
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/* Filename of a dll whose state change (e.g., load or unload)
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triggered this catchpoint. This field is only vaid immediately
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after this catchpoint has triggered. */
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char *triggered_dll_pathname;
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/* Process id of a child process whose forking triggered this
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catchpoint. This field is only vaid immediately after this
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catchpoint has triggered. */
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int forked_inferior_pid;
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/* Filename of a program whose exec triggered this catchpoint.
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This field is only vaid immediately after this catchpoint has
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triggered. */
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char *exec_pathname;
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asection *section;
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};
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/* The following stuff is an abstract data type "bpstat" ("breakpoint
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status"). This provides the ability to determine whether we have
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stopped at a breakpoint, and what we should do about it. */
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typedef struct bpstats *bpstat;
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/* Interface: */
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/* Clear a bpstat so that it says we are not at any breakpoint.
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Also free any storage that is part of a bpstat. */
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extern void bpstat_clear PARAMS ((bpstat *));
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/* Return a copy of a bpstat. Like "bs1 = bs2" but all storage that
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is part of the bpstat is copied as well. */
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extern bpstat bpstat_copy PARAMS ((bpstat));
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extern bpstat bpstat_stop_status PARAMS ((CORE_ADDR *, int));
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/* This bpstat_what stuff tells wait_for_inferior what to do with a
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breakpoint (a challenging task). */
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enum bpstat_what_main_action
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{
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/* Perform various other tests; that is, this bpstat does not
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say to perform any action (e.g. failed watchpoint and nothing
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else). */
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BPSTAT_WHAT_KEEP_CHECKING,
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/* Rather than distinguish between noisy and silent stops here, it
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might be cleaner to have bpstat_print make that decision (also
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taking into account stop_print_frame and source_only). But the
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implications are a bit scary (interaction with auto-displays, etc.),
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so I won't try it. */
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/* Stop silently. */
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BPSTAT_WHAT_STOP_SILENT,
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/* Stop and print. */
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BPSTAT_WHAT_STOP_NOISY,
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/* Remove breakpoints, single step once, then put them back in and
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go back to what we were doing. It's possible that this should be
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removed from the main_action and put into a separate field, to more
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cleanly handle BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE. */
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BPSTAT_WHAT_SINGLE,
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/* Set longjmp_resume breakpoint, remove all other breakpoints,
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and continue. The "remove all other breakpoints" part is required
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if we are also stepping over another breakpoint as well as doing
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the longjmp handling. */
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BPSTAT_WHAT_SET_LONGJMP_RESUME,
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/* Clear longjmp_resume breakpoint, then handle as
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BPSTAT_WHAT_KEEP_CHECKING. */
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BPSTAT_WHAT_CLEAR_LONGJMP_RESUME,
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/* Clear longjmp_resume breakpoint, then handle as BPSTAT_WHAT_SINGLE. */
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BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE,
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/* Clear step resume breakpoint, and keep checking. */
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BPSTAT_WHAT_STEP_RESUME,
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/* Clear through_sigtramp breakpoint, muck with trap_expected, and keep
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checking. */
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BPSTAT_WHAT_THROUGH_SIGTRAMP,
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/* Check the dynamic linker's data structures for new libraries, then
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keep checking. */
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BPSTAT_WHAT_CHECK_SHLIBS,
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/* Check the dynamic linker's data structures for new libraries, then
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resume out of the dynamic linker's callback, stop and print. */
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BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK,
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/* This is just used to keep track of how many enums there are. */
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BPSTAT_WHAT_LAST
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};
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struct bpstat_what
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{
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enum bpstat_what_main_action main_action;
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/* Did we hit a call dummy breakpoint? This only goes with a main_action
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of BPSTAT_WHAT_STOP_SILENT or BPSTAT_WHAT_STOP_NOISY (the concept of
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continuing from a call dummy without popping the frame is not a
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useful one). */
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int call_dummy;
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};
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/* The possible return values for print_bpstat, print_it_normal,
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print_it_done, print_it_noop. */
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enum print_stop_action
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{
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PRINT_UNKNOWN = -1,
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PRINT_SRC_AND_LOC,
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PRINT_SRC_ONLY,
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PRINT_NOTHING
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};
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/* Tell what to do about this bpstat. */
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struct bpstat_what bpstat_what PARAMS ((bpstat));
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/* Find the bpstat associated with a breakpoint. NULL otherwise. */
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bpstat bpstat_find_breakpoint PARAMS ((bpstat, struct breakpoint *));
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/* Find a step_resume breakpoint associated with this bpstat.
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(If there are multiple step_resume bp's on the list, this function
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will arbitrarily pick one.)
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It is an error to use this function if BPSTAT doesn't contain a
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step_resume breakpoint.
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See wait_for_inferior's use of this function.
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*/
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extern struct breakpoint *
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bpstat_find_step_resume_breakpoint PARAMS ((bpstat));
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/* Nonzero if a signal that we got in wait() was due to circumstances
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explained by the BS. */
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/* Currently that is true if we have hit a breakpoint, or if there is
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a watchpoint enabled. */
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#define bpstat_explains_signal(bs) ((bs) != NULL)
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/* Nonzero if we should step constantly (e.g. watchpoints on machines
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without hardware support). This isn't related to a specific bpstat,
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just to things like whether watchpoints are set. */
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extern int bpstat_should_step PARAMS ((void));
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/* Nonzero if there are enabled hardware watchpoints. */
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extern int bpstat_have_active_hw_watchpoints PARAMS ((void));
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/* Print a message indicating what happened. Returns nonzero to
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say that only the source line should be printed after this (zero
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return means print the frame as well as the source line). */
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extern enum print_stop_action bpstat_print PARAMS ((bpstat));
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/* Return the breakpoint number of the first breakpoint we are stopped
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at. *BSP upon return is a bpstat which points to the remaining
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breakpoints stopped at (but which is not guaranteed to be good for
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anything but further calls to bpstat_num).
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Return 0 if passed a bpstat which does not indicate any breakpoints. */
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extern int bpstat_num PARAMS ((bpstat *));
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/* Perform actions associated with having stopped at *BSP. Actually, we just
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use this for breakpoint commands. Perhaps other actions will go here
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later, but this is executed at a late time (from the command loop). */
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extern void bpstat_do_actions PARAMS ((bpstat *));
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/* Modify BS so that the actions will not be performed. */
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extern void bpstat_clear_actions PARAMS ((bpstat));
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/* Given a bpstat that records zero or more triggered eventpoints, this
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function returns another bpstat which contains only the catchpoints
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on that first list, if any.
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*/
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extern void bpstat_get_triggered_catchpoints PARAMS ((bpstat, bpstat *));
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/* Implementation: */
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/* Values used to tell the printing routine how to behave for this bpstat. */
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enum bp_print_how
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{
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/* This is used when we want to do a normal printing of the reason
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for stopping. The output will depend on the type of eventpoint
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we are dealing with. This is the default value, most commonly
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used. */
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print_it_normal,
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/* This is used when nothing should be printed for this bpstat entry. */
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print_it_noop,
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/* This is used when everything which needs to be printed has
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already been printed. But we still want to print the frame. */
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print_it_done
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};
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struct bpstats
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{
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/* Linked list because there can be two breakpoints at the same
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place, and a bpstat reflects the fact that both have been hit. */
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bpstat next;
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/* Breakpoint that we are at. */
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struct breakpoint *breakpoint_at;
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/* Commands left to be done. */
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struct command_line *commands;
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/* Old value associated with a watchpoint. */
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value_ptr old_val;
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/* Nonzero if this breakpoint tells us to print the frame. */
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char print;
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/* Nonzero if this breakpoint tells us to stop. */
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char stop;
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/* Tell bpstat_print and print_bp_stop_message how to print stuff
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associated with this element of the bpstat chain. */
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enum bp_print_how print_it;
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};
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enum inf_context
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{
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inf_starting,
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inf_running,
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inf_exited
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};
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/* The possible return values for breakpoint_here_p.
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We guarantee that zero always means "no breakpoint here". */
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enum breakpoint_here
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{
|
||
no_breakpoint_here = 0,
|
||
ordinary_breakpoint_here,
|
||
permanent_breakpoint_here
|
||
};
|
||
|
||
|
||
/* Prototypes for breakpoint-related functions. */
|
||
|
||
/* Forward declarations for prototypes */
|
||
struct frame_info;
|
||
|
||
extern enum breakpoint_here breakpoint_here_p PARAMS ((CORE_ADDR));
|
||
|
||
extern int breakpoint_inserted_here_p PARAMS ((CORE_ADDR));
|
||
|
||
extern int frame_in_dummy PARAMS ((struct frame_info *));
|
||
|
||
extern int breakpoint_thread_match PARAMS ((CORE_ADDR, int));
|
||
|
||
extern void until_break_command PARAMS ((char *, int));
|
||
|
||
extern void breakpoint_re_set PARAMS ((void));
|
||
|
||
extern void breakpoint_re_set_thread PARAMS ((struct breakpoint *));
|
||
|
||
extern int ep_is_exception_catchpoint PARAMS ((struct breakpoint *));
|
||
|
||
extern struct breakpoint *set_momentary_breakpoint
|
||
PARAMS ((struct symtab_and_line, struct frame_info *, enum bptype));
|
||
|
||
extern void set_ignore_count PARAMS ((int, int, int));
|
||
|
||
extern void set_default_breakpoint PARAMS ((int, CORE_ADDR,
|
||
struct symtab *, int));
|
||
|
||
extern void mark_breakpoints_out PARAMS ((void));
|
||
|
||
extern void breakpoint_init_inferior PARAMS ((enum inf_context));
|
||
|
||
extern void delete_breakpoint PARAMS ((struct breakpoint *));
|
||
|
||
extern void breakpoint_auto_delete PARAMS ((bpstat));
|
||
|
||
extern void breakpoint_clear_ignore_counts PARAMS ((void));
|
||
|
||
extern void break_command PARAMS ((char *, int));
|
||
|
||
extern void tbreak_command PARAMS ((char *, int));
|
||
|
||
extern int insert_breakpoints PARAMS ((void));
|
||
|
||
extern int remove_breakpoints PARAMS ((void));
|
||
|
||
/* This function can be used to physically insert eventpoints from the
|
||
specified traced inferior process, without modifying the breakpoint
|
||
package's state. This can be useful for those targets which support
|
||
following the processes of a fork() or vfork() system call, when both
|
||
of the resulting two processes are to be followed. */
|
||
extern int reattach_breakpoints PARAMS ((int));
|
||
|
||
/* This function can be used to update the breakpoint package's state
|
||
after an exec() system call has been executed.
|
||
|
||
This function causes the following:
|
||
|
||
- All eventpoints are marked "not inserted".
|
||
- All eventpoints with a symbolic address are reset such that
|
||
the symbolic address must be reevaluated before the eventpoints
|
||
can be reinserted.
|
||
- The solib breakpoints are explicitly removed from the breakpoint
|
||
list.
|
||
- A step-resume breakpoint, if any, is explicitly removed from the
|
||
breakpoint list.
|
||
- All eventpoints without a symbolic address are removed from the
|
||
breakpoint list. */
|
||
extern void update_breakpoints_after_exec PARAMS ((void));
|
||
|
||
/* This function can be used to physically remove hardware breakpoints
|
||
and watchpoints from the specified traced inferior process, without
|
||
modifying the breakpoint package's state. This can be useful for
|
||
those targets which support following the processes of a fork() or
|
||
vfork() system call, when one of the resulting two processes is to
|
||
be detached and allowed to run free.
|
||
|
||
It is an error to use this function on the process whose id is
|
||
inferior_pid. */
|
||
extern int detach_breakpoints PARAMS ((int));
|
||
|
||
extern void enable_longjmp_breakpoint PARAMS ((void));
|
||
|
||
extern void disable_longjmp_breakpoint PARAMS ((void));
|
||
|
||
extern void set_longjmp_resume_breakpoint PARAMS ((CORE_ADDR,
|
||
struct frame_info *));
|
||
/* These functions respectively disable or reenable all currently
|
||
enabled watchpoints. When disabled, the watchpoints are marked
|
||
call_disabled. When reenabled, they are marked enabled.
|
||
|
||
The intended client of these functions is infcmd.c\run_stack_dummy.
|
||
|
||
The inferior must be stopped, and all breakpoints removed, when
|
||
these functions are used.
|
||
|
||
The need for these functions is that on some targets (e.g., HP-UX),
|
||
gdb is unable to unwind through the dummy frame that is pushed as
|
||
part of the implementation of a call command. Watchpoints can
|
||
cause the inferior to stop in places where this frame is visible,
|
||
and that can cause execution control to become very confused.
|
||
|
||
Note that if a user sets breakpoints in an interactively call
|
||
function, the call_disabled watchpoints will have been reenabled
|
||
when the first such breakpoint is reached. However, on targets
|
||
that are unable to unwind through the call dummy frame, watches
|
||
of stack-based storage may then be deleted, because gdb will
|
||
believe that their watched storage is out of scope. (Sigh.) */
|
||
extern void
|
||
disable_watchpoints_before_interactive_call_start PARAMS ((void));
|
||
|
||
extern void
|
||
enable_watchpoints_after_interactive_call_stop PARAMS ((void));
|
||
|
||
|
||
extern void clear_breakpoint_hit_counts PARAMS ((void));
|
||
|
||
extern int get_number PARAMS ((char **));
|
||
|
||
extern int get_number_or_range PARAMS ((char **));
|
||
|
||
/* The following are for displays, which aren't really breakpoints, but
|
||
here is as good a place as any for them. */
|
||
|
||
extern void disable_current_display PARAMS ((void));
|
||
|
||
extern void do_displays PARAMS ((void));
|
||
|
||
extern void disable_display PARAMS ((int));
|
||
|
||
extern void clear_displays PARAMS ((void));
|
||
|
||
extern void disable_breakpoint PARAMS ((struct breakpoint *));
|
||
|
||
extern void enable_breakpoint PARAMS ((struct breakpoint *));
|
||
|
||
extern void make_breakpoint_permanent PARAMS ((struct breakpoint *));
|
||
|
||
extern struct breakpoint *create_solib_event_breakpoint PARAMS ((CORE_ADDR));
|
||
|
||
extern struct breakpoint *create_thread_event_breakpoint PARAMS ((CORE_ADDR));
|
||
|
||
extern void remove_solib_event_breakpoints PARAMS ((void));
|
||
|
||
extern void remove_thread_event_breakpoints PARAMS ((void));
|
||
|
||
extern void disable_breakpoints_in_shlibs PARAMS ((int silent));
|
||
|
||
extern void re_enable_breakpoints_in_shlibs PARAMS ((void));
|
||
|
||
extern void create_solib_load_event_breakpoint PARAMS ((char *, int,
|
||
char *, char *));
|
||
|
||
extern void create_solib_unload_event_breakpoint PARAMS ((char *, int,
|
||
char *, char *));
|
||
|
||
extern void create_fork_event_catchpoint PARAMS ((int, char *));
|
||
|
||
extern void create_vfork_event_catchpoint PARAMS ((int, char *));
|
||
|
||
extern void create_exec_event_catchpoint PARAMS ((int, char *));
|
||
|
||
/* This function returns TRUE if ep is a catchpoint. */
|
||
extern int ep_is_catchpoint PARAMS ((struct breakpoint *));
|
||
|
||
/* This function returns TRUE if ep is a catchpoint of a
|
||
shared library (aka dynamically-linked library) event,
|
||
such as a library load or unload. */
|
||
extern int ep_is_shlib_catchpoint PARAMS ((struct breakpoint *));
|
||
|
||
extern struct breakpoint *set_breakpoint_sal PARAMS ((struct symtab_and_line));
|
||
|
||
/* Enable breakpoints and delete when hit. Called with ARG == NULL
|
||
deletes all breakpoints. */
|
||
extern void delete_command (char *arg, int from_tty);
|
||
|
||
#endif /* !defined (BREAKPOINT_H) */
|