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binutils-gdb/gdb/breakpoint.h
Joel Brobecker 28e7fd6234 Update years in copyright notice for the GDB files. 
Two modifications:
  1. The addition of 2013 to the copyright year range for every file;
  2. The use of a single year range, instead of potentially multiple
     year ranges, as approved by the FSF.
2013-01-01 06:33:28 +00:00

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/* Data structures associated with breakpoints in GDB.
Copyright (C) 1992-2013 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#if !defined (BREAKPOINT_H)
#define BREAKPOINT_H 1
#include "frame.h"
#include "value.h"
#include "vec.h"
#include "ax.h"
#include "command.h"
struct value;
struct block;
struct breakpoint_object;
struct get_number_or_range_state;
struct thread_info;
struct bpstats;
struct bp_location;
struct linespec_result;
struct linespec_sals;
/* This is the maximum number of bytes a breakpoint instruction can
take. Feel free to increase it. It's just used in a few places to
size arrays that should be independent of the target
architecture. */
#define BREAKPOINT_MAX 16
/* Type of breakpoint. */
/* FIXME In the future, we should fold all other breakpoint-like
things into here. This includes:
* single-step (for machines where we have to simulate single
stepping) (probably, though perhaps it is better for it to look as
much as possible like a single-step to wait_for_inferior). */
enum bptype
{
bp_none = 0, /* Eventpoint has been deleted */
bp_breakpoint, /* Normal breakpoint */
bp_hardware_breakpoint, /* Hardware assisted breakpoint */
bp_until, /* used by until command */
bp_finish, /* used by finish command */
bp_watchpoint, /* Watchpoint */
bp_hardware_watchpoint, /* Hardware assisted watchpoint */
bp_read_watchpoint, /* read watchpoint, (hardware assisted) */
bp_access_watchpoint, /* access watchpoint, (hardware assisted) */
bp_longjmp, /* secret breakpoint to find longjmp() */
bp_longjmp_resume, /* secret breakpoint to escape longjmp() */
/* Breakpoint placed to the same location(s) like bp_longjmp but used to
protect against stale DUMMY_FRAME. Multiple bp_longjmp_call_dummy and
one bp_call_dummy are chained together by related_breakpoint for each
DUMMY_FRAME. */
bp_longjmp_call_dummy,
/* An internal breakpoint that is installed on the unwinder's
debug hook. */
bp_exception,
/* An internal breakpoint that is set at the point where an
exception will land. */
bp_exception_resume,
/* Used by wait_for_inferior for stepping over subroutine calls,
and for skipping prologues. */
bp_step_resume,
/* Used by wait_for_inferior for stepping over signal
handlers. */
bp_hp_step_resume,
/* Used to detect when a watchpoint expression has gone out of
scope. These breakpoints are usually not visible to the user.
This breakpoint has some interesting properties:
1) There's always a 1:1 mapping between watchpoints
on local variables and watchpoint_scope breakpoints.
2) It automatically deletes itself and the watchpoint it's
associated with when hit.
3) It can never be disabled. */
bp_watchpoint_scope,
/* The breakpoint at the end of a call dummy. See bp_longjmp_call_dummy it
is chained with by related_breakpoint. */
bp_call_dummy,
/* A breakpoint set on std::terminate, that is used to catch
otherwise uncaught exceptions thrown during an inferior call. */
bp_std_terminate,
/* Some dynamic linkers (HP, maybe Solaris) can arrange for special
code in the inferior to run when significant events occur in the
dynamic linker (for example a library is loaded or unloaded).
By placing a breakpoint in this magic code GDB will get control
when these significant events occur. GDB can then re-examine
the dynamic linker's data structures to discover any newly loaded
dynamic libraries. */
bp_shlib_event,
/* Some multi-threaded systems can arrange for a location in the
inferior to be executed when certain thread-related events occur
(such as thread creation or thread death).
By placing a breakpoint at one of these locations, GDB will get
control when these events occur. GDB can then update its thread
lists etc. */
bp_thread_event,
/* On the same principal, an overlay manager can arrange to call a
magic location in the inferior whenever there is an interesting
change in overlay status. GDB can update its overlay tables
and fiddle with breakpoints in overlays when this breakpoint
is hit. */
bp_overlay_event,
/* Master copies of longjmp breakpoints. These are always installed
as soon as an objfile containing longjmp is loaded, but they are
always disabled. While necessary, temporary clones of bp_longjmp
type will be created and enabled. */
bp_longjmp_master,
/* Master copies of std::terminate breakpoints. */
bp_std_terminate_master,
/* Like bp_longjmp_master, but for exceptions. */
bp_exception_master,
bp_catchpoint,
bp_tracepoint,
bp_fast_tracepoint,
bp_static_tracepoint,
/* A dynamic printf stops at the given location, does a formatted
print, then automatically continues. (Although this is sort of
like a macro packaging up standard breakpoint functionality,
GDB doesn't have a way to construct types of breakpoint from
elements of behavior.) */
bp_dprintf,
/* Event for JIT compiled code generation or deletion. */
bp_jit_event,
/* Breakpoint is placed at the STT_GNU_IFUNC resolver. When hit GDB
inserts new bp_gnu_ifunc_resolver_return at the caller.
bp_gnu_ifunc_resolver is still being kept here as a different thread
may still hit it before bp_gnu_ifunc_resolver_return is hit by the
original thread. */
bp_gnu_ifunc_resolver,
/* On its hit GDB now know the resolved address of the target
STT_GNU_IFUNC function. Associated bp_gnu_ifunc_resolver can be
deleted now and the breakpoint moved to the target function entry
point. */
bp_gnu_ifunc_resolver_return,
};
/* States of enablement of breakpoint. */
enum enable_state
{
bp_disabled, /* The eventpoint is inactive, and cannot
trigger. */
bp_enabled, /* The eventpoint is active, and can
trigger. */
bp_call_disabled, /* The eventpoint has been disabled while a
call into the inferior is "in flight",
because some eventpoints interfere with
the implementation of a call on some
targets. The eventpoint will be
automatically enabled and reset when the
call "lands" (either completes, or stops
at another eventpoint). */
bp_permanent /* There is a breakpoint instruction
hard-wired into the target's code. Don't
try to write another breakpoint
instruction on top of it, or restore its
value. Step over it using the
architecture's SKIP_INSN macro. */
};
/* Disposition of breakpoint. Ie: what to do after hitting it. */
enum bpdisp
{
disp_del, /* Delete it */
disp_del_at_next_stop, /* Delete at next stop,
whether hit or not */
disp_disable, /* Disable it */
disp_donttouch /* Leave it alone */
};
enum target_hw_bp_type
{
hw_write = 0, /* Common HW watchpoint */
hw_read = 1, /* Read HW watchpoint */
hw_access = 2, /* Access HW watchpoint */
hw_execute = 3 /* Execute HW breakpoint */
};
/* Status of breakpoint conditions used when synchronizing
conditions with the target. */
enum condition_status
{
condition_unchanged = 0,
condition_modified,
condition_updated
};
/* Information used by targets to insert and remove breakpoints. */
struct bp_target_info
{
/* Address space at which the breakpoint was placed. */
struct address_space *placed_address_space;
/* Address at which the breakpoint was placed. This is normally the
same as ADDRESS from the bp_location, except when adjustment
happens in gdbarch_breakpoint_from_pc. The most common form of
adjustment is stripping an alternate ISA marker from the PC which
is used to determine the type of breakpoint to insert. */
CORE_ADDR placed_address;
/* If this is a ranged breakpoint, then this field contains the
length of the range that will be watched for execution. */
int length;
/* If the breakpoint lives in memory and reading that memory would
give back the breakpoint, instead of the original contents, then
the original contents are cached here. Only SHADOW_LEN bytes of
this buffer are valid, and only when the breakpoint is inserted. */
gdb_byte shadow_contents[BREAKPOINT_MAX];
/* The length of the data cached in SHADOW_CONTENTS. */
int shadow_len;
/* The size of the placed breakpoint, according to
gdbarch_breakpoint_from_pc, when the breakpoint was inserted.
This is generally the same as SHADOW_LEN, unless we did not need
to read from the target to implement the memory breakpoint
(e.g. if a remote stub handled the details). We may still need
the size to remove the breakpoint safely. */
int placed_size;
/* Vector of conditions the target should evaluate if it supports target-side
breakpoint conditions. */
VEC(agent_expr_p) *conditions;
/* Vector of commands the target should evaluate if it supports
target-side breakpoint commands. */
VEC(agent_expr_p) *tcommands;
/* Flag that is true if the breakpoint should be left in place even
when GDB is not connected. */
int persist;
};
/* GDB maintains two types of information about each breakpoint (or
watchpoint, or other related event). The first type corresponds
to struct breakpoint; this is a relatively high-level structure
which contains the source location(s), stopping conditions, user
commands to execute when the breakpoint is hit, and so forth.
The second type of information corresponds to struct bp_location.
Each breakpoint has one or (eventually) more locations associated
with it, which represent target-specific and machine-specific
mechanisms for stopping the program. For instance, a watchpoint
expression may require multiple hardware watchpoints in order to
catch all changes in the value of the expression being watched. */
enum bp_loc_type
{
bp_loc_software_breakpoint,
bp_loc_hardware_breakpoint,
bp_loc_hardware_watchpoint,
bp_loc_other /* Miscellaneous... */
};
/* This structure is a collection of function pointers that, if
available, will be called instead of performing the default action
for this bp_loc_type. */
struct bp_location_ops
{
/* Destructor. Releases everything from SELF (but not SELF
itself). */
void (*dtor) (struct bp_location *self);
};
struct bp_location
{
/* Chain pointer to the next breakpoint location for
the same parent breakpoint. */
struct bp_location *next;
/* Methods associated with this location. */
const struct bp_location_ops *ops;
/* The reference count. */
int refc;
/* Type of this breakpoint location. */
enum bp_loc_type loc_type;
/* Each breakpoint location must belong to exactly one higher-level
breakpoint. This pointer is NULL iff this bp_location is no
longer attached to a breakpoint. For example, when a breakpoint
is deleted, its locations may still be found in the
moribund_locations list, or if we had stopped for it, in
bpstats. */
struct breakpoint *owner;
/* Conditional. Break only if this expression's value is nonzero.
Unlike string form of condition, which is associated with
breakpoint, this is associated with location, since if breakpoint
has several locations, the evaluation of expression can be
different for different locations. Only valid for real
breakpoints; a watchpoint's conditional expression is stored in
the owner breakpoint object. */
struct expression *cond;
/* Conditional expression in agent expression
bytecode form. This is used for stub-side breakpoint
condition evaluation. */
struct agent_expr *cond_bytecode;
/* Signals that the condition has changed since the last time
we updated the global location list. This means the condition
needs to be sent to the target again. This is used together
with target-side breakpoint conditions.
condition_unchanged: It means there has been no condition changes.
condition_modified: It means this location had its condition modified.
condition_updated: It means we already marked all the locations that are
duplicates of this location and thus we don't need to call
force_breakpoint_reinsertion (...) for this location. */
enum condition_status condition_changed;
struct agent_expr *cmd_bytecode;
/* Signals that breakpoint conditions and/or commands need to be
re-synched with the target. This has no use other than
target-side breakpoints. */
char needs_update;
/* This location's address is in an unloaded solib, and so this
location should not be inserted. It will be automatically
enabled when that solib is loaded. */
char shlib_disabled;
/* Is this particular location enabled. */
char enabled;
/* Nonzero if this breakpoint is now inserted. */
char inserted;
/* Nonzero if this is not the first breakpoint in the list
for the given address. location of tracepoint can _never_
be duplicated with other locations of tracepoints and other
kinds of breakpoints, because two locations at the same
address may have different actions, so both of these locations
should be downloaded and so that `tfind N' always works. */
char duplicate;
/* If we someday support real thread-specific breakpoints, then
the breakpoint location will need a thread identifier. */
/* Data for specific breakpoint types. These could be a union, but
simplicity is more important than memory usage for breakpoints. */
/* Architecture associated with this location's address. May be
different from the breakpoint architecture. */
struct gdbarch *gdbarch;
/* The program space associated with this breakpoint location
address. Note that an address space may be represented in more
than one program space (e.g. each uClinux program will be given
its own program space, but there will only be one address space
for all of them), but we must not insert more than one location
at the same address in the same address space. */
struct program_space *pspace;
/* Note that zero is a perfectly valid code address on some platforms
(for example, the mn10200 (OBSOLETE) and mn10300 simulators). NULL
is not a special value for this field. Valid for all types except
bp_loc_other. */
CORE_ADDR address;
/* For hardware watchpoints, the size of the memory region being
watched. For hardware ranged breakpoints, the size of the
breakpoint range. */
int length;
/* Type of hardware watchpoint. */
enum target_hw_bp_type watchpoint_type;
/* For any breakpoint type with an address, this is the section
associated with the address. Used primarily for overlay
debugging. */
struct obj_section *section;
/* Address at which breakpoint was requested, either by the user or
by GDB for internal breakpoints. This will usually be the same
as ``address'' (above) except for cases in which
ADJUST_BREAKPOINT_ADDRESS has computed a different address at
which to place the breakpoint in order to comply with a
processor's architectual constraints. */
CORE_ADDR requested_address;
/* An additional address assigned with this location. This is currently
only used by STT_GNU_IFUNC resolver breakpoints to hold the address
of the resolver function. */
CORE_ADDR related_address;
/* If the location comes from a probe point, this is the probe associated
with it. */
struct probe *probe;
char *function_name;
/* Details of the placed breakpoint, when inserted. */
struct bp_target_info target_info;
/* Similarly, for the breakpoint at an overlay's LMA, if necessary. */
struct bp_target_info overlay_target_info;
/* In a non-stop mode, it's possible that we delete a breakpoint,
but as we do that, some still running thread hits that breakpoint.
For that reason, we need to keep locations belonging to deleted
breakpoints for a bit, so that don't report unexpected SIGTRAP.
We can't keep such locations forever, so we use a heuristic --
after we process certain number of inferior events since
breakpoint was deleted, we retire all locations of that breakpoint.
This variable keeps a number of events still to go, when
it becomes 0 this location is retired. */
int events_till_retirement;
/* Line number of this address. */
int line_number;
/* Source file name of this address. */
char *source_file;
};
/* This structure is a collection of function pointers that, if available,
will be called instead of the performing the default action for this
bptype. */
struct breakpoint_ops
{
/* Destructor. Releases everything from SELF (but not SELF
itself). */
void (*dtor) (struct breakpoint *self);
/* Allocate a location for this breakpoint. */
struct bp_location * (*allocate_location) (struct breakpoint *);
/* Reevaluate a breakpoint. This is necessary after symbols change
(e.g., an executable or DSO was loaded, or the inferior just
started). */
void (*re_set) (struct breakpoint *self);
/* Insert the breakpoint or watchpoint or activate the catchpoint.
Return 0 for success, 1 if the breakpoint, watchpoint or
catchpoint type is not supported, -1 for failure. */
int (*insert_location) (struct bp_location *);
/* Remove the breakpoint/catchpoint that was previously inserted
with the "insert" method above. Return 0 for success, 1 if the
breakpoint, watchpoint or catchpoint type is not supported,
-1 for failure. */
int (*remove_location) (struct bp_location *);
/* Return true if it the target has stopped due to hitting
breakpoint location BL. This function does not check if we
should stop, only if BL explains the stop. ASPACE is the address
space in which the event occurred, BP_ADDR is the address at
which the inferior stopped, and WS is the target_waitstatus
describing the event. */
int (*breakpoint_hit) (const struct bp_location *bl,
struct address_space *aspace,
CORE_ADDR bp_addr,
const struct target_waitstatus *ws);
/* Check internal conditions of the breakpoint referred to by BS.
If we should not stop for this breakpoint, set BS->stop to 0. */
void (*check_status) (struct bpstats *bs);
/* Tell how many hardware resources (debug registers) are needed
for this breakpoint. If this function is not provided, then
the breakpoint or watchpoint needs one debug register. */
int (*resources_needed) (const struct bp_location *);
/* Tell whether we can downgrade from a hardware watchpoint to a software
one. If not, the user will not be able to enable the watchpoint when
there are not enough hardware resources available. */
int (*works_in_software_mode) (const struct breakpoint *);
/* The normal print routine for this breakpoint, called when we
hit it. */
enum print_stop_action (*print_it) (struct bpstats *bs);
/* Display information about this breakpoint, for "info
breakpoints". */
void (*print_one) (struct breakpoint *, struct bp_location **);
/* Display extra information about this breakpoint, below the normal
breakpoint description in "info breakpoints".
In the example below, the "address range" line was printed
by print_one_detail_ranged_breakpoint.
(gdb) info breakpoints
Num Type Disp Enb Address What
2 hw breakpoint keep y in main at test-watch.c:70
address range: [0x10000458, 0x100004c7]
*/
void (*print_one_detail) (const struct breakpoint *, struct ui_out *);
/* Display information about this breakpoint after setting it
(roughly speaking; this is called from "mention"). */
void (*print_mention) (struct breakpoint *);
/* Print to FP the CLI command that recreates this breakpoint. */
void (*print_recreate) (struct breakpoint *, struct ui_file *fp);
/* Create SALs from address string, storing the result in linespec_result.
For an explanation about the arguments, see the function
`create_sals_from_address_default'.
This function is called inside `create_breakpoint'. */
void (*create_sals_from_address) (char **, struct linespec_result *,
enum bptype, char *, char **);
/* This method will be responsible for creating a breakpoint given its SALs.
Usually, it just calls `create_breakpoints_sal' (for ordinary
breakpoints). However, there may be some special cases where we might
need to do some tweaks, e.g., see
`strace_marker_create_breakpoints_sal'.
This function is called inside `create_breakpoint'. */
void (*create_breakpoints_sal) (struct gdbarch *,
struct linespec_result *,
struct linespec_sals *, char *,
char *,
enum bptype, enum bpdisp, int, int,
int, const struct breakpoint_ops *,
int, int, int, unsigned);
/* Given the address string (second parameter), this method decodes it
and provides the SAL locations related to it. For ordinary breakpoints,
it calls `decode_line_full'.
This function is called inside `addr_string_to_sals'. */
void (*decode_linespec) (struct breakpoint *, char **,
struct symtabs_and_lines *);
};
/* Helper for breakpoint_ops->print_recreate implementations. Prints
the "thread" or "task" condition of B, and then a newline.
Necessary because most breakpoint implementations accept
thread/task conditions at the end of the spec line, like "break foo
thread 1", which needs outputting before any breakpoint-type
specific extra command necessary for B's recreation. */
extern void print_recreate_thread (struct breakpoint *b, struct ui_file *fp);
enum watchpoint_triggered
{
/* This watchpoint definitely did not trigger. */
watch_triggered_no = 0,
/* Some hardware watchpoint triggered, and it might have been this
one, but we do not know which it was. */
watch_triggered_unknown,
/* This hardware watchpoint definitely did trigger. */
watch_triggered_yes
};
typedef struct bp_location *bp_location_p;
DEF_VEC_P(bp_location_p);
/* A reference-counted struct command_line. This lets multiple
breakpoints share a single command list. This is an implementation
detail to the breakpoints module. */
struct counted_command_line;
/* Some targets (e.g., embedded PowerPC) need two debug registers to set
a watchpoint over a memory region. If this flag is true, GDB will use
only one register per watchpoint, thus assuming that all acesses that
modify a memory location happen at its starting address. */
extern int target_exact_watchpoints;
/* Note 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
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 all kinds of breakpoints. */
struct breakpoint
{
/* Methods associated with this breakpoint. */
const struct breakpoint_ops *ops;
struct breakpoint *next;
/* Type of breakpoint. */
enum bptype type;
/* Zero means disabled; remember the info but don't break here. */
enum enable_state enable_state;
/* What to do with this breakpoint after we hit it. */
enum bpdisp disposition;
/* Number assigned to distinguish breakpoints. */
int number;
/* Location(s) associated with this high-level breakpoint. */
struct bp_location *loc;
/* Non-zero means a silent breakpoint (don't print frame info
if we stop here). */
unsigned char silent;
/* Non-zero means display ADDR_STRING to the user verbatim. */
unsigned char display_canonical;
/* Number of stops at this breakpoint that should
be continued automatically before really stopping. */
int ignore_count;
/* Number of stops at this breakpoint before it will be
disabled. */
int enable_count;
/* Chain of command lines to execute when this breakpoint is
hit. */
struct counted_command_line *commands;
/* Stack depth (address of frame). If nonzero, break only if fp
equals this. */
struct frame_id frame_id;
/* The program space used to set the breakpoint. This is only set
for breakpoints which are specific to a program space; for
non-thread-specific ordinary breakpoints this is NULL. */
struct program_space *pspace;
/* String we used to set the breakpoint (malloc'd). */
char *addr_string;
/* The filter that should be passed to decode_line_full when
re-setting this breakpoint. This may be NULL, but otherwise is
allocated with xmalloc. */
char *filter;
/* For a ranged breakpoint, the string we used to find
the end of the range (malloc'd). */
char *addr_string_range_end;
/* Architecture we used to set the breakpoint. */
struct gdbarch *gdbarch;
/* Language we used to set the breakpoint. */
enum language language;
/* Input radix we used to set the breakpoint. */
int input_radix;
/* String form of the breakpoint condition (malloc'd), or NULL if
there is no condition. */
char *cond_string;
/* String form of extra parameters, or NULL if there are none. */
char *extra_string;
/* Holds the address of the related watchpoint_scope breakpoint
when using watchpoints on local variables (might the concept of
a related breakpoint be useful elsewhere, if not just call it
the watchpoint_scope breakpoint or something like that.
FIXME). */
struct breakpoint *related_breakpoint;
/* Thread number for thread-specific breakpoint,
or -1 if don't care. */
int thread;
/* Ada task number for task-specific breakpoint,
or 0 if don't care. */
int task;
/* Count of the number of times this breakpoint was taken, dumped
with the info, but not used for anything else. Useful for
seeing how many times you hit a break prior to the program
aborting, so you can back up to just before the abort. */
int hit_count;
/* Is breakpoint's condition not yet parsed because we found
no location initially so had no context to parse
the condition in. */
int condition_not_parsed;
/* With a Python scripting enabled GDB, store a reference to the
Python object that has been associated with this breakpoint.
This is always NULL for a GDB that is not script enabled. It
can sometimes be NULL for enabled GDBs as not all breakpoint
types are tracked by the Python scripting API. */
struct breakpoint_object *py_bp_object;
};
/* An instance of this type is used to represent a watchpoint. It
includes a "struct breakpoint" as a kind of base class; users
downcast to "struct breakpoint *" when needed. */
struct watchpoint
{
/* The base class. */
struct breakpoint base;
/* String form of exp to use for displaying to the user (malloc'd),
or NULL if none. */
char *exp_string;
/* String form to use for reparsing of EXP (malloc'd) or NULL. */
char *exp_string_reparse;
/* 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). */
const struct block *exp_valid_block;
/* The conditional expression if any. */
struct expression *cond_exp;
/* The largest block within which it is valid, or NULL if it is
valid anywhere (e.g. consists just of global symbols). */
const struct block *cond_exp_valid_block;
/* Value of the watchpoint the last time we checked it, or NULL when
we do not know the value yet or the value was not readable. VAL
is never lazy. */
struct value *val;
/* Nonzero if VAL is valid. If VAL_VALID is set but VAL is NULL,
then an error occurred reading the value. */
int val_valid;
/* Holds the frame address which identifies the frame this
watchpoint should be evaluated in, or `null' if the watchpoint
should be evaluated on the outermost frame. */
struct frame_id watchpoint_frame;
/* Holds the thread which identifies the frame this watchpoint
should be considered in scope for, or `null_ptid' if the
watchpoint should be evaluated in all threads. */
ptid_t watchpoint_thread;
/* For hardware watchpoints, the triggered status according to the
hardware. */
enum watchpoint_triggered watchpoint_triggered;
/* Whether this watchpoint is exact (see
target_exact_watchpoints). */
int exact;
/* The mask address for a masked hardware watchpoint. */
CORE_ADDR hw_wp_mask;
};
/* Return true if BPT is either a software breakpoint or a hardware
breakpoint. */
extern int is_breakpoint (const struct breakpoint *bpt);
/* Returns true if BPT is really a watchpoint. */
extern int is_watchpoint (const struct breakpoint *bpt);
/* An instance of this type is used to represent all kinds of
tracepoints. It includes a "struct breakpoint" as a kind of base
class; users downcast to "struct breakpoint *" when needed. */
struct tracepoint
{
/* The base class. */
struct breakpoint base;
/* Number of times this tracepoint should single-step and collect
additional data. */
long step_count;
/* Number of times this tracepoint should be hit before
disabling/ending. */
int pass_count;
/* The number of the tracepoint on the target. */
int number_on_target;
/* The total space taken by all the trace frames for this
tracepoint. */
ULONGEST traceframe_usage;
/* The static tracepoint marker id, if known. */
char *static_trace_marker_id;
/* LTTng/UST allow more than one marker with the same ID string,
although it unadvised because it confuses tools. When setting
static tracepoints by marker ID, this will record the index in
the array of markers we found for the given marker ID for which
this static tracepoint corresponds. When resetting breakpoints,
we will use this index to try to find the same marker again. */
int static_trace_marker_id_idx;
};
typedef struct breakpoint *breakpoint_p;
DEF_VEC_P(breakpoint_p);
/* The following stuff is an abstract data type "bpstat" ("breakpoint
status"). This provides the ability to determine whether we have
stopped at a breakpoint, and what we should do about it. */
typedef struct bpstats *bpstat;
/* Clears a chain of bpstat, freeing storage
of each. */
extern void bpstat_clear (bpstat *);
/* Return a copy of a bpstat. Like "bs1 = bs2" but all storage that
is part of the bpstat is copied as well. */
extern bpstat bpstat_copy (bpstat);
extern bpstat bpstat_stop_status (struct address_space *aspace,
CORE_ADDR pc, ptid_t ptid,
const struct target_waitstatus *ws);
/* This bpstat_what stuff tells wait_for_inferior what to do with a
breakpoint (a challenging task).
The enum values order defines priority-like order of the actions.
Once you've decided that some action is appropriate, you'll never
go back and decide something of a lower priority is better. Each
of these actions is mutually exclusive with the others. That
means, that if you find yourself adding a new action class here and
wanting to tell GDB that you have two simultaneous actions to
handle, something is wrong, and you probably don't actually need a
new action type.
Note that a step resume breakpoint overrides another breakpoint of
signal handling (see comment in wait_for_inferior at where we set
the step_resume breakpoint). */
enum bpstat_what_main_action
{
/* Perform various other tests; that is, this bpstat does not
say to perform any action (e.g. failed watchpoint and nothing
else). */
BPSTAT_WHAT_KEEP_CHECKING,
/* Remove breakpoints, single step once, then put them back in and
go back to what we were doing. It's possible that this should
be removed from the main_action and put into a separate field,
to more cleanly handle
BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE. */
BPSTAT_WHAT_SINGLE,
/* Set longjmp_resume breakpoint, remove all other breakpoints,
and continue. The "remove all other breakpoints" part is
required if we are also stepping over another breakpoint as
well as doing the longjmp handling. */
BPSTAT_WHAT_SET_LONGJMP_RESUME,
/* Clear longjmp_resume breakpoint, then handle as
BPSTAT_WHAT_KEEP_CHECKING. */
BPSTAT_WHAT_CLEAR_LONGJMP_RESUME,
/* Clear step resume breakpoint, and keep checking. */
BPSTAT_WHAT_STEP_RESUME,
/* Rather than distinguish between noisy and silent stops here, it
might be cleaner to have bpstat_print make that decision (also
taking into account stop_print_frame and source_only). But the
implications are a bit scary (interaction with auto-displays,
etc.), so I won't try it. */
/* Stop silently. */
BPSTAT_WHAT_STOP_SILENT,
/* Stop and print. */
BPSTAT_WHAT_STOP_NOISY,
/* Clear step resume breakpoint, and keep checking. High-priority
step-resume breakpoints are used when even if there's a user
breakpoint at the current PC when we set the step-resume
breakpoint, we don't want to re-handle any breakpoint other
than the step-resume when it's hit; instead we want to move
past the breakpoint. This is used in the case of skipping
signal handlers. */
BPSTAT_WHAT_HP_STEP_RESUME,
};
/* An enum indicating the kind of "stack dummy" stop. This is a bit
of a misnomer because only one kind of truly a stack dummy. */
enum stop_stack_kind
{
/* We didn't stop at a stack dummy breakpoint. */
STOP_NONE = 0,
/* Stopped at a stack dummy. */
STOP_STACK_DUMMY,
/* Stopped at std::terminate. */
STOP_STD_TERMINATE
};
struct bpstat_what
{
enum bpstat_what_main_action main_action;
/* Did we hit a call dummy breakpoint? This only goes with a
main_action of BPSTAT_WHAT_STOP_SILENT or
BPSTAT_WHAT_STOP_NOISY (the concept of continuing from a call
dummy without popping the frame is not a useful one). */
enum stop_stack_kind call_dummy;
/* Used for BPSTAT_WHAT_SET_LONGJMP_RESUME and
BPSTAT_WHAT_CLEAR_LONGJMP_RESUME. True if we are handling a
longjmp, false if we are handling an exception. */
int is_longjmp;
};
/* The possible return values for print_bpstat, print_it_normal,
print_it_done, print_it_noop. */
enum print_stop_action
{
/* We printed nothing or we need to do some more analysis. */
PRINT_UNKNOWN = -1,
/* We printed something, and we *do* desire that something to be
followed by a location. */
PRINT_SRC_AND_LOC,
/* We printed something, and we do *not* desire that something to
be followed by a location. */
PRINT_SRC_ONLY,
/* We already printed all we needed to print, don't print anything
else. */
PRINT_NOTHING
};
/* Tell what to do about this bpstat. */
struct bpstat_what bpstat_what (bpstat);
/* Find the bpstat associated with a breakpoint. NULL otherwise. */
bpstat bpstat_find_breakpoint (bpstat, struct breakpoint *);
/* Nonzero if a signal that we got in wait() was due to circumstances
explained by the BS. */
/* Currently that is true if we have hit a breakpoint, or if there is
a watchpoint enabled. */
#define bpstat_explains_signal(bs) ((bs) != NULL)
/* Nonzero is this bpstat causes a stop. */
extern int bpstat_causes_stop (bpstat);
/* Nonzero if we should step constantly (e.g. watchpoints on machines
without hardware support). This isn't related to a specific bpstat,
just to things like whether watchpoints are set. */
extern int bpstat_should_step (void);
/* Print a message indicating what happened. Returns nonzero to
say that only the source line should be printed after this (zero
return means print the frame as well as the source line). */
extern enum print_stop_action bpstat_print (bpstat, int);
/* Put in *NUM the breakpoint number of the first breakpoint we are
stopped at. *BSP upon return is a bpstat which points to the
remaining breakpoints stopped at (but which is not guaranteed to be
good for anything but further calls to bpstat_num).
Return 0 if passed a bpstat which does not indicate any breakpoints.
Return -1 if stopped at a breakpoint that has been deleted since
we set it.
Return 1 otherwise. */
extern int bpstat_num (bpstat *, int *);
/* Perform actions associated with the stopped inferior. Actually, we
just use this for breakpoint commands. Perhaps other actions will
go here later, but this is executed at a late time (from the
command loop). */
extern void bpstat_do_actions (void);
/* Modify all entries of STOP_BPSTAT of INFERIOR_PTID so that the actions will
not be performed. */
extern void bpstat_clear_actions (void);
/* Implementation: */
/* Values used to tell the printing routine how to behave for this
bpstat. */
enum bp_print_how
{
/* This is used when we want to do a normal printing of the reason
for stopping. The output will depend on the type of eventpoint
we are dealing with. This is the default value, most commonly
used. */
print_it_normal,
/* This is used when nothing should be printed for this bpstat
entry. */
print_it_noop,
/* This is used when everything which needs to be printed has
already been printed. But we still want to print the frame. */
print_it_done
};
struct bpstats
{
/* Linked list because there can be more than one breakpoint at
the same place, and a bpstat reflects the fact that all have
been hit. */
bpstat next;
/* Location that caused the stop. Locations are refcounted, so
this will never be NULL. Note that this location may end up
detached from a breakpoint, but that does not necessary mean
that the struct breakpoint is gone. E.g., consider a
watchpoint with a condition that involves an inferior function
call. Watchpoint locations are recreated often (on resumes,
hence on infcalls too). Between creating the bpstat and after
evaluating the watchpoint condition, this location may hence
end up detached from its original owner watchpoint, even though
the watchpoint is still listed. If it's condition evaluates as
true, we still want this location to cause a stop, and we will
still need to know which watchpoint it was originally attached.
What this means is that we should not (in most cases) follow
the `bpstat->bp_location->owner' link, but instead use the
`breakpoint_at' field below. */
struct bp_location *bp_location_at;
/* Breakpoint that caused the stop. This is nullified if the
breakpoint ends up being deleted. See comments on
`bp_location_at' above for why do we need this field instead of
following the location's owner. */
struct breakpoint *breakpoint_at;
/* The associated command list. */
struct counted_command_line *commands;
/* Old value associated with a watchpoint. */
struct value *old_val;
/* Nonzero if this breakpoint tells us to print the frame. */
char print;
/* Nonzero if this breakpoint tells us to stop. */
char stop;
/* Tell bpstat_print and print_bp_stop_message how to print stuff
associated with this element of the bpstat chain. */
enum bp_print_how print_it;
};
enum inf_context
{
inf_starting,
inf_running,
inf_exited,
inf_execd
};
/* The possible return values for breakpoint_here_p.
We guarantee that zero always means "no breakpoint here". */
enum breakpoint_here
{
no_breakpoint_here = 0,
ordinary_breakpoint_here,
permanent_breakpoint_here
};
/* Prototypes for breakpoint-related functions. */
extern enum breakpoint_here breakpoint_here_p (struct address_space *,
CORE_ADDR);
extern int moribund_breakpoint_here_p (struct address_space *, CORE_ADDR);
extern int breakpoint_inserted_here_p (struct address_space *, CORE_ADDR);
extern int regular_breakpoint_inserted_here_p (struct address_space *,
CORE_ADDR);
extern int software_breakpoint_inserted_here_p (struct address_space *,
CORE_ADDR);
/* Returns true if there's a hardware watchpoint or access watchpoint
inserted in the range defined by ADDR and LEN. */
extern int hardware_watchpoint_inserted_in_range (struct address_space *,
CORE_ADDR addr,
ULONGEST len);
extern int breakpoint_thread_match (struct address_space *,
CORE_ADDR, ptid_t);
extern void until_break_command (char *, int, int);
/* Initialize a struct bp_location. */
extern void init_bp_location (struct bp_location *loc,
const struct bp_location_ops *ops,
struct breakpoint *owner);
extern void update_breakpoint_locations (struct breakpoint *b,
struct symtabs_and_lines sals,
struct symtabs_and_lines sals_end);
extern void breakpoint_re_set (void);
extern void breakpoint_re_set_thread (struct breakpoint *);
extern struct breakpoint *set_momentary_breakpoint
(struct gdbarch *, struct symtab_and_line, struct frame_id, enum bptype);
extern struct breakpoint *set_momentary_breakpoint_at_pc
(struct gdbarch *, CORE_ADDR pc, enum bptype type);
extern struct breakpoint *clone_momentary_breakpoint (struct breakpoint *bpkt);
extern void set_ignore_count (int, int, int);
extern void breakpoint_init_inferior (enum inf_context);
extern struct cleanup *make_cleanup_delete_breakpoint (struct breakpoint *);
extern void delete_breakpoint (struct breakpoint *);
extern void breakpoint_auto_delete (bpstat);
typedef void (*walk_bp_location_callback) (struct bp_location *, void *);
extern void iterate_over_bp_locations (walk_bp_location_callback);
/* Return the chain of command lines to execute when this breakpoint
is hit. */
extern struct command_line *breakpoint_commands (struct breakpoint *b);
/* Return a string image of DISP. The string is static, and thus should
NOT be deallocated after use. */
const char *bpdisp_text (enum bpdisp disp);
extern void break_command (char *, int);
extern void hbreak_command_wrapper (char *, int);
extern void thbreak_command_wrapper (char *, int);
extern void rbreak_command_wrapper (char *, int);
extern void watch_command_wrapper (char *, int, int);
extern void awatch_command_wrapper (char *, int, int);
extern void rwatch_command_wrapper (char *, int, int);
extern void tbreak_command (char *, int);
extern struct breakpoint_ops bkpt_breakpoint_ops;
extern struct breakpoint_ops tracepoint_breakpoint_ops;
extern void initialize_breakpoint_ops (void);
/* Arguments to pass as context to some catch command handlers. */
#define CATCH_PERMANENT ((void *) (uintptr_t) 0)
#define CATCH_TEMPORARY ((void *) (uintptr_t) 1)
/* Like add_cmd, but add the command to both the "catch" and "tcatch"
lists, and pass some additional user data to the command
function. */
extern void
add_catch_command (char *name, char *docstring,
void (*sfunc) (char *args, int from_tty,
struct cmd_list_element *command),
completer_ftype *completer,
void *user_data_catch,
void *user_data_tcatch);
/* Initialize a breakpoint struct for Ada exception catchpoints. */
extern void
init_ada_exception_breakpoint (struct breakpoint *b,
struct gdbarch *gdbarch,
struct symtab_and_line sal,
char *addr_string,
const struct breakpoint_ops *ops,
int tempflag,
int from_tty);
/* Add breakpoint B on the breakpoint list, and notify the user, the
target and breakpoint_created observers of its existence. If
INTERNAL is non-zero, the breakpoint number will be allocated from
the internal breakpoint count. If UPDATE_GLL is non-zero,
update_global_location_list will be called. */
extern void install_breakpoint (int internal, struct breakpoint *b,
int update_gll);
/* Flags that can be passed down to create_breakpoint, etc., to affect
breakpoint creation in several ways. */
enum breakpoint_create_flags
{
/* We're adding a breakpoint to our tables that is already
inserted in the target. */
CREATE_BREAKPOINT_FLAGS_INSERTED = 1 << 0
};
extern int create_breakpoint (struct gdbarch *gdbarch, char *arg,
char *cond_string, int thread,
char *extra_string,
int parse_condition_and_thread,
int tempflag, enum bptype wanted_type,
int ignore_count,
enum auto_boolean pending_break_support,
const struct breakpoint_ops *ops,
int from_tty,
int enabled,
int internal, unsigned flags);
extern void insert_breakpoints (void);
extern int remove_breakpoints (void);
extern int remove_breakpoints_pid (int pid);
/* 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 (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 (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_ptid. */
extern int detach_breakpoints (ptid_t ptid);
/* This function is called when program space PSPACE is about to be
deleted. It takes care of updating breakpoints to not reference
this PSPACE anymore. */
extern void breakpoint_program_space_exit (struct program_space *pspace);
extern void set_longjmp_breakpoint (struct thread_info *tp,
struct frame_id frame);
extern void delete_longjmp_breakpoint (int thread);
/* Mark all longjmp breakpoints from THREAD for later deletion. */
extern void delete_longjmp_breakpoint_at_next_stop (int thread);
extern struct breakpoint *set_longjmp_breakpoint_for_call_dummy (void);
extern void check_longjmp_breakpoint_for_call_dummy (int thread);
extern void enable_overlay_breakpoints (void);
extern void disable_overlay_breakpoints (void);
extern void set_std_terminate_breakpoint (void);
extern void delete_std_terminate_breakpoint (void);
/* These functions respectively disable or reenable all currently
enabled watchpoints. When disabled, the watchpoints are marked
call_disabled. When re-enabled, they are marked enabled.
The intended client of these functions is call_function_by_hand.
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 called
function, the call_disabled watchpoints will have been re-enabled
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 (void);
extern void enable_watchpoints_after_interactive_call_stop (void);
/* These functions disable and re-enable all breakpoints during
inferior startup. They are intended to be called from solib
code where necessary. This is needed on platforms where the
main executable is relocated at some point during startup
processing, making breakpoint addresses invalid.
If additional breakpoints are created after the routine
disable_breakpoints_before_startup but before the routine
enable_breakpoints_after_startup was called, they will also
be marked as disabled. */
extern void disable_breakpoints_before_startup (void);
extern void enable_breakpoints_after_startup (void);
/* For script interpreters that need to define breakpoint commands
after they've already read the commands into a struct
command_line. */
extern enum command_control_type commands_from_control_command
(char *arg, struct command_line *cmd);
extern void clear_breakpoint_hit_counts (void);
extern struct breakpoint *get_breakpoint (int num);
/* 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 (void);
extern void do_displays (void);
extern void disable_display (int);
extern void clear_displays (void);
extern void disable_breakpoint (struct breakpoint *);
extern void enable_breakpoint (struct breakpoint *);
extern void breakpoint_set_commands (struct breakpoint *b,
struct command_line *commands);
extern void breakpoint_set_silent (struct breakpoint *b, int silent);
extern void breakpoint_set_thread (struct breakpoint *b, int thread);
extern void breakpoint_set_task (struct breakpoint *b, int task);
/* Clear the "inserted" flag in all breakpoints. */
extern void mark_breakpoints_out (void);
extern void make_breakpoint_permanent (struct breakpoint *);
extern struct breakpoint *create_jit_event_breakpoint (struct gdbarch *,
CORE_ADDR);
extern struct breakpoint *create_solib_event_breakpoint (struct gdbarch *,
CORE_ADDR);
extern struct breakpoint *create_thread_event_breakpoint (struct gdbarch *,
CORE_ADDR);
extern void remove_jit_event_breakpoints (void);
extern void remove_solib_event_breakpoints (void);
extern void remove_thread_event_breakpoints (void);
extern void disable_breakpoints_in_shlibs (void);
/* This function returns TRUE if ep is a catchpoint. */
extern int is_catchpoint (struct breakpoint *);
/* Shared helper function (MI and CLI) for creating and installing
a shared object event catchpoint. */
extern void add_solib_catchpoint (char *arg, int is_load, int is_temp,
int enabled);
/* Enable breakpoints and delete when hit. Called with ARG == NULL
deletes all breakpoints. */
extern void delete_command (char *arg, int from_tty);
/* Manage a software single step breakpoint (or two). Insert may be
called twice before remove is called. */
extern void insert_single_step_breakpoint (struct gdbarch *,
struct address_space *,
CORE_ADDR);
extern int single_step_breakpoints_inserted (void);
extern void remove_single_step_breakpoints (void);
extern void cancel_single_step_breakpoints (void);
/* Manage manual breakpoints, separate from the normal chain of
breakpoints. These functions are used in murky target-specific
ways. Please do not add more uses! */
extern void *deprecated_insert_raw_breakpoint (struct gdbarch *,
struct address_space *,
CORE_ADDR);
extern int deprecated_remove_raw_breakpoint (struct gdbarch *, void *);
/* Check if any hardware watchpoints have triggered, according to the
target. */
int watchpoints_triggered (struct target_waitstatus *);
/* Helper for transparent breakpoint hiding for memory read and write
routines.
Update one of READBUF or WRITEBUF with either the shadows
(READBUF), or the breakpoint instructions (WRITEBUF) of inserted
breakpoints at the memory range defined by MEMADDR and extending
for LEN bytes. If writing, then WRITEBUF is a copy of WRITEBUF_ORG
on entry.*/
extern void breakpoint_xfer_memory (gdb_byte *readbuf, gdb_byte *writebuf,
const gdb_byte *writebuf_org,
ULONGEST memaddr, LONGEST len);
extern int breakpoints_always_inserted_mode (void);
/* Called each time new event from target is processed.
Retires previously deleted breakpoint locations that
in our opinion won't ever trigger. */
extern void breakpoint_retire_moribund (void);
/* Set break condition of breakpoint B to EXP. */
extern void set_breakpoint_condition (struct breakpoint *b, char *exp,
int from_tty);
/* Checks if we are catching syscalls or not.
Returns 0 if not, greater than 0 if we are. */
extern int catch_syscall_enabled (void);
/* Checks if we are catching syscalls with the specific
syscall_number. Used for "filtering" the catchpoints.
Returns 0 if not, greater than 0 if we are. */
extern int catching_syscall_number (int syscall_number);
/* Return a tracepoint with the given number if found. */
extern struct tracepoint *get_tracepoint (int num);
extern struct tracepoint *get_tracepoint_by_number_on_target (int num);
/* Find a tracepoint by parsing a number in the supplied string. */
extern struct tracepoint *
get_tracepoint_by_number (char **arg,
struct get_number_or_range_state *state,
int optional_p);
/* Return a vector of all tracepoints currently defined. The vector
is newly allocated; the caller should free when done with it. */
extern VEC(breakpoint_p) *all_tracepoints (void);
extern int is_tracepoint (const struct breakpoint *b);
/* Return a vector of all static tracepoints defined at ADDR. The
vector is newly allocated; the caller should free when done with
it. */
extern VEC(breakpoint_p) *static_tracepoints_here (CORE_ADDR addr);
/* Function that can be passed to read_command_line to validate
that each command is suitable for tracepoint command list. */
extern void check_tracepoint_command (char *line, void *closure);
/* Call at the start and end of an "rbreak" command to register
breakpoint numbers for a later "commands" command. */
extern void start_rbreak_breakpoints (void);
extern void end_rbreak_breakpoints (void);
/* Breakpoint iterator function.
Calls a callback function once for each breakpoint, so long as the
callback function returns false. If the callback function returns
true, the iteration will end and the current breakpoint will be
returned. This can be useful for implementing a search for a
breakpoint with arbitrary attributes, or for applying an operation
to every breakpoint. */
extern struct breakpoint *iterate_over_breakpoints (int (*) (struct breakpoint *,
void *), void *);
/* Nonzero if the specified PC cannot be a location where functions
have been inlined. */
extern int pc_at_non_inline_function (struct address_space *aspace,
CORE_ADDR pc,
const struct target_waitstatus *ws);
extern int user_breakpoint_p (struct breakpoint *);
/* Attempt to determine architecture of location identified by SAL. */
extern struct gdbarch *get_sal_arch (struct symtab_and_line sal);
extern void handle_solib_event (void);
#endif /* !defined (BREAKPOINT_H) */
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