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binutils-gdb/gdb/breakpoint.h
Simon Marchi 0b63c811ef gdb: introduce bp_loc_tracepoint 
Since commit cb1e4e32c2 ("catch catch/throw/rethrow", breakpoint ->
catchpoint), this simple tracing scenario does not work:

    $ gdb/gdb -nx -q --data-directory=gdb/data-directory ./test
    Reading symbols from ./test...
    (gdb) tar rem :1234
    Remote debugging using :1234
    Reading symbols from /lib64/ld-linux-x86-64.so.2...
    (No debugging symbols found in /lib64/ld-linux-x86-64.so.2)
    0x00007ffff7fe5730 in ?? () from /lib64/ld-linux-x86-64.so.2
    (gdb) trace do_something
    Tracepoint 1 at 0x555555555144: file test.c, line 5.
    (gdb) tstart
    (gdb) continue
    Continuing.
    Target returns error code '01'.

The root cause is that the bp_location::nserted flag does not transfer
anymore from an old bp_location to the new matching one.  When a shared
library gets loaded, GDB computes new breakpoint locations for each
breakpoint in update_breakpoint_locations.  The new locations are in the
breakpoint::loc chain, while the old locations are still in the
bp_locations global vector.  Later, update_global_location_list is
called.  It tries to map old locations to new locations, and if
necessary transfer some properties, like the inserted flag.

Since commit cb1e4e32c2, the inserted flag isn't transferred for
locations of tracepoints.  This is because bl_address_is_meaningful used
to be implemented like this:

    static int
    breakpoint_address_is_meaningful (struct breakpoint *bpt)
    {
      enum bptype type = bpt->type;

      return (type != bp_watchpoint && type != bp_catchpoint);
    }

and was changed to this:

    static bool
    bl_address_is_meaningful (bp_location *loc)
    {
      return loc->loc_type != bp_loc_other;
    }

Because locations for tracepoints have the bp_loc_other type,
bl_address_is_meaningful started to return false for them, where it
returned true before.  This made update_global_location_list skip the
part where it calls swap_insertion.

I think this can be solved by introduced a new bp_loc_tracepoint
bp_loc_type.

I don't know if it's accurate, but my understanding is that bp_loc_type
describes roughly "how do we ask the target to insert that location".
bp_loc_software_breakpoint are inserted using
target_ops::insert_breakpoint_location.  bp_loc_hardware_breakpoint are
inserted using target_ops::insert_hw_breakpoint.
bp_loc_software_watchpoint and bp_loc_hardware_watchpoint are inserted
using target_ops::insert_watchpoint.  For all these, the address is
meaningful, as we ask the target to insert the point at a specific
address.  bp_loc_other is a catch-all for "the rest", in practice for
catchpoints that don't have a specific address (hence why
bl_address_is_meaningful returns false for them).  For instance,
inserting a signal catchpoint is done by asking the target to report
that specific signal.  GDB doesn't associate an address to that.

But tracepoints do have a meaningful address to thems, so they can't be
bp_loc_other, with that logic.  They also can't be
bp_loc_software_breakpoint, because we don't want GDB to insert
breakpoints for them (even though they might be implemented using
software breakpoints by the remote side).  So, the new bp_loc_tracepoint
type describes that the way to insert these locations is with
target_ops::download_tracepoint.  It makes bl_address_is_meaningful
return true for them.  And they'll be ignored by insert_bp_location and
GDB won't try to insert a memory breakpoint for them.

With this, I see a few instances of 'Target returns error code: 01'
disappearing from gdb.log, and the results of gdb.trace/*.exp improve a
little bit:

    -# of expected passes       3765
    +# of expected passes       3781
    -# of unexpected failures   518
    +# of unexpected failures   498

Things remain quite broken in that area though.

Change-Id: Ic40935c450410f4bfaba397c9ebc7faf97320dd3
2023-03-17 16:34:25 -04:00

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/* Data structures associated with breakpoints in GDB.
Copyright (C) 1992-2023 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 "ax.h"
#include "command.h"
#include "gdbsupport/break-common.h"
#include "probe.h"
#include "location.h"
#include <vector>
#include "gdbsupport/array-view.h"
#include "gdbsupport/filtered-iterator.h"
#include "gdbsupport/function-view.h"
#include "gdbsupport/next-iterator.h"
#include "gdbsupport/iterator-range.h"
#include "gdbsupport/refcounted-object.h"
#include "gdbsupport/safe-iterator.h"
#include "cli/cli-script.h"
#include "target/waitstatus.h"
struct block;
struct gdbpy_breakpoint_object;
struct gdbscm_breakpoint_object;
struct number_or_range_parser;
struct thread_info;
struct bpstat;
struct bp_location;
struct linespec_result;
struct linespec_sals;
struct inferior;
/* Enum for exception-handling support in 'catch throw', 'catch rethrow',
'catch catch' and the MI equivalent. */
enum exception_event_kind
{
EX_EVENT_THROW,
EX_EVENT_RETHROW,
EX_EVENT_CATCH
};
/* Why are we removing the breakpoint from the target? */
enum remove_bp_reason
{
/* A regular remove. Remove the breakpoint and forget everything
about it. */
REMOVE_BREAKPOINT,
/* Detach the breakpoints from a fork child. */
DETACH_BREAKPOINT,
};
/* 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. */
enum bptype
{
bp_none = 0, /* Eventpoint has been deleted */
bp_breakpoint, /* Normal breakpoint */
bp_hardware_breakpoint, /* Hardware assisted breakpoint */
bp_single_step, /* Software single-step */
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,
/* Like bp_static_tracepoint but for static markers. */
bp_static_marker_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). */
};
/* 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 */
};
/* 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 REQUESTED_ADDRESS, 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;
/* Address at which the breakpoint was requested. */
CORE_ADDR reqstd_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 breakpoint's kind. It is used in 'kind' parameter in Z
packets. */
int kind;
/* Conditions the target should evaluate if it supports target-side
breakpoint conditions. These are non-owning pointers. */
std::vector<agent_expr *> conditions;
/* Commands the target should evaluate if it supports target-side
breakpoint commands. These are non-owning pointers. */
std::vector<agent_expr *> 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_software_watchpoint,
bp_loc_hardware_watchpoint,
bp_loc_tracepoint,
bp_loc_other /* Miscellaneous... */
};
class bp_location : public refcounted_object
{
public:
bp_location () = default;
/* Construct a bp_location with the type inferred from OWNER's
type. */
explicit bp_location (breakpoint *owner);
/* Construct a bp_location with type TYPE. */
bp_location (breakpoint *owner, bp_loc_type type);
virtual ~bp_location () = default;
/* Chain pointer to the next breakpoint location for
the same parent breakpoint. */
bp_location *next = NULL;
/* Type of this breakpoint location. */
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. */
breakpoint *owner = NULL;
/* 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. */
expression_up cond;
/* Conditional expression in agent expression
bytecode form. This is used for stub-side breakpoint
condition evaluation. */
agent_expr_up 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. */
condition_status condition_changed {};
agent_expr_up cmd_bytecode;
/* Signals that breakpoint conditions and/or commands need to be
re-synced with the target. This has no use other than
target-side breakpoints. */
bool needs_update = false;
/* 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. */
bool shlib_disabled = false;
/* Is this particular location enabled. */
bool enabled = false;
/* Is this particular location disabled because the condition
expression is invalid at this location. For a location to be
reported as enabled, the ENABLED field above has to be true *and*
the DISABLED_BY_COND field has to be false. */
bool disabled_by_cond = false;
/* True if this breakpoint is now inserted. */
bool inserted = false;
/* True if this is a permanent breakpoint. 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
gdbarch_skip_permanent_breakpoint method. */
bool permanent = false;
/* True 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. */
bool duplicate = false;
/* 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 = NULL;
/* 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. */
program_space *pspace = NULL;
/* 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 = 0;
/* For hardware watchpoints, the size of the memory region being
watched. For hardware ranged breakpoints, the size of the
breakpoint range. */
int length = 0;
/* Type of hardware watchpoint. */
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. */
obj_section *section = NULL;
/* 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 = 0;
/* 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 = 0;
/* If the location comes from a probe point, this is the probe associated
with it. */
bound_probe probe {};
gdb::unique_xmalloc_ptr<char> function_name;
/* Details of the placed breakpoint, when inserted. */
bp_target_info target_info {};
/* Similarly, for the breakpoint at an overlay's LMA, if necessary. */
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 = 0;
/* Line number which was used to place this location.
Breakpoint placed into a comment keeps it's user specified line number
despite ADDRESS resolves into a different line number. */
int line_number = 0;
/* Symtab which was used to place this location. This is used
to find the corresponding source file name. */
struct symtab *symtab = NULL;
/* The symbol found by the location parser, if any. This may be used to
ascertain when a location spec was set at a different location than
the one originally selected by parsing, e.g., inlined symbols. */
const struct symbol *symbol = NULL;
/* Similarly, the minimal symbol found by the location parser, if
any. This may be used to ascertain if the location was
originally set on a GNU ifunc symbol. */
const minimal_symbol *msymbol = NULL;
/* The objfile the symbol or minimal symbol were found in. */
const struct objfile *objfile = NULL;
};
/* A policy class for bp_location reference counting. */
struct bp_location_ref_policy
{
static void incref (bp_location *loc)
{
loc->incref ();
}
static void decref (bp_location *loc)
{
gdb_assert (loc->refcount () > 0);
loc->decref ();
if (loc->refcount () == 0)
delete loc;
}
};
/* A gdb::ref_ptr that has been specialized for bp_location. */
typedef gdb::ref_ptr<bp_location, bp_location_ref_policy>
bp_location_ref_ptr;
/* 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
};
/* 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
{
/* Create SALs from location spec, storing the result in
linespec_result.
For an explanation about the arguments, see the function
`create_sals_from_location_spec_default'.
This function is called inside `create_breakpoint'. */
void (*create_sals_from_location_spec) (location_spec *locspec,
struct linespec_result *canonical);
/* 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 *,
gdb::unique_xmalloc_ptr<char>,
gdb::unique_xmalloc_ptr<char>,
enum bptype, enum bpdisp, int, int,
int, int, int, int, unsigned);
};
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
};
/* 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 accesses that
modify a memory location happen at its starting address. */
extern bool target_exact_watchpoints;
/* bp_location linked list range. */
using bp_location_range = next_range<bp_location>;
/* 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 */
/* Abstract base class representing all kinds of breakpoints. */
struct breakpoint
{
breakpoint (struct gdbarch *gdbarch_, enum bptype bptype,
bool temp = true, const char *cond_string = nullptr);
DISABLE_COPY_AND_ASSIGN (breakpoint);
virtual ~breakpoint () = 0;
/* Allocate a location for this breakpoint. */
virtual struct bp_location *allocate_location ();
/* Reevaluate a breakpoint. This is necessary after symbols change
(e.g., an executable or DSO was loaded, or the inferior just
started). */
virtual void re_set ()
{
/* Nothing to re-set. */
}
/* 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. */
virtual 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. */
virtual int remove_location (struct bp_location *,
enum remove_bp_reason reason);
/* 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. */
virtual int breakpoint_hit (const struct bp_location *bl,
const address_space *aspace,
CORE_ADDR bp_addr,
const 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
false. */
virtual void check_status (struct bpstat *bs)
{
/* Always stop. */
}
/* 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. */
virtual int resources_needed (const struct bp_location *);
/* The normal print routine for this breakpoint, called when we
hit it. */
virtual enum print_stop_action print_it (const bpstat *bs) const;
/* Display information about this breakpoint, for "info
breakpoints". Returns false if this method should use the
default behavior. */
virtual bool print_one (bp_location **) const
{
return false;
}
/* 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 ranged_breakpoint::print_one_detail.
(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]
*/
virtual void print_one_detail (struct ui_out *) const
{
/* Nothing. */
}
/* Display information about this breakpoint after setting it
(roughly speaking; this is called from "mention"). */
virtual void print_mention () const;
/* Print to FP the CLI command that recreates this breakpoint. */
virtual void print_recreate (struct ui_file *fp) const;
/* Return true if this breakpoint explains a signal. See
bpstat_explains_signal. */
virtual bool explains_signal (enum gdb_signal)
{
return true;
}
/* Called after evaluating the breakpoint's condition,
and only if it evaluated true. */
virtual void after_condition_true (struct bpstat *bs)
{
/* Nothing to do. */
}
/* Return a range of this breakpoint's locations. */
bp_location_range locations () const;
breakpoint *next = NULL;
/* Type of breakpoint. */
bptype type = bp_none;
/* Zero means disabled; remember the info but don't break here. */
enum enable_state enable_state = bp_enabled;
/* What to do with this breakpoint after we hit it. */
bpdisp disposition = disp_del;
/* Number assigned to distinguish breakpoints. */
int number = 0;
/* Location(s) associated with this high-level breakpoint. */
bp_location *loc = NULL;
/* True means a silent breakpoint (don't print frame info if we stop
here). */
bool silent = false;
/* True means display ADDR_STRING to the user verbatim. */
bool display_canonical = false;
/* Number of stops at this breakpoint that should be continued
automatically before really stopping. */
int ignore_count = 0;
/* Number of stops at this breakpoint before it will be
disabled. */
int enable_count = 0;
/* Chain of command lines to execute when this breakpoint is
hit. */
counted_command_line commands;
/* Stack depth (address of frame). If nonzero, break only if fp
equals this. */
struct frame_id frame_id = null_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. */
program_space *pspace = NULL;
/* The location specification we used to set the breakpoint. */
location_spec_up locspec;
/* The filter that should be passed to decode_line_full when
re-setting this breakpoint. This may be NULL. */
gdb::unique_xmalloc_ptr<char> filter;
/* For a ranged breakpoint, the location specification we used to
find the end of the range. */
location_spec_up locspec_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. */
gdb::unique_xmalloc_ptr<char> cond_string;
/* String form of extra parameters, or NULL if there are none.
Malloc'd. */
gdb::unique_xmalloc_ptr<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). */
breakpoint *related_breakpoint;
/* Thread number for thread-specific breakpoint, or -1 if don't
care. */
int thread = -1;
/* Ada task number for task-specific breakpoint, or -1 if don't
care. */
int task = -1;
/* 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 = 0;
/* 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 = 0;
/* 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 scripting language API. */
gdbpy_breakpoint_object *py_bp_object = NULL;
/* Same as py_bp_object, but for Scheme. */
gdbscm_breakpoint_object *scm_bp_object = NULL;
protected:
/* 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. */
void print_recreate_thread (struct ui_file *fp) const;
};
/* Abstract base class representing code breakpoints. User "break"
breakpoints, internal and momentary breakpoints, etc. IOW, any
kind of breakpoint whose locations are created from SALs. */
struct code_breakpoint : public breakpoint
{
using breakpoint::breakpoint;
/* Create a breakpoint with SALS as locations. Use LOCATION as a
description of the location, and COND_STRING as condition
expression. If LOCATION is NULL then create an "address
location" from the address in the SAL. */
code_breakpoint (struct gdbarch *gdbarch, bptype type,
gdb::array_view<const symtab_and_line> sals,
location_spec_up &&locspec,
gdb::unique_xmalloc_ptr<char> filter,
gdb::unique_xmalloc_ptr<char> cond_string,
gdb::unique_xmalloc_ptr<char> extra_string,
enum bpdisp disposition,
int thread, int task, int ignore_count,
int from_tty,
int enabled, unsigned flags,
int display_canonical);
~code_breakpoint () override = 0;
/* Add a location for SAL to this breakpoint. */
bp_location *add_location (const symtab_and_line &sal);
void re_set () override;
int insert_location (struct bp_location *) override;
int remove_location (struct bp_location *,
enum remove_bp_reason reason) override;
int breakpoint_hit (const struct bp_location *bl,
const address_space *aspace,
CORE_ADDR bp_addr,
const target_waitstatus &ws) override;
protected:
/* Given the location spec, this method decodes it and returns the
SAL locations related to it. For ordinary breakpoints, it calls
`decode_line_full'. If SEARCH_PSPACE is not NULL, symbol search
is restricted to just that program space.
This function is called inside `location_spec_to_sals'. */
virtual std::vector<symtab_and_line> decode_location_spec
(location_spec *locspec,
struct program_space *search_pspace);
/* Helper method that does the basic work of re_set. */
void re_set_default ();
/* Find the SaL locations corresponding to the given LOCATION.
On return, FOUND will be 1 if any SaL was found, zero otherwise. */
std::vector<symtab_and_line> location_spec_to_sals
(location_spec *locspec,
struct program_space *search_pspace,
int *found);
/* Helper for breakpoint and tracepoint breakpoint->mention
callbacks. */
void say_where () const;
};
/* An instance of this type is used to represent a watchpoint,
a.k.a. a data breakpoint. */
struct watchpoint : public breakpoint
{
using breakpoint::breakpoint;
void re_set () override;
int insert_location (struct bp_location *) override;
int remove_location (struct bp_location *,
enum remove_bp_reason reason) override;
int breakpoint_hit (const struct bp_location *bl,
const address_space *aspace,
CORE_ADDR bp_addr,
const target_waitstatus &ws) override;
void check_status (struct bpstat *bs) override;
int resources_needed (const struct bp_location *) override;
/* 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. */
virtual bool works_in_software_mode () const;
enum print_stop_action print_it (const bpstat *bs) const override;
void print_mention () const override;
void print_recreate (struct ui_file *fp) const override;
bool explains_signal (enum gdb_signal) override;
/* String form of exp to use for displaying to the user (malloc'd),
or NULL if none. */
gdb::unique_xmalloc_ptr<char> exp_string;
/* String form to use for reparsing of EXP (malloc'd) or NULL. */
gdb::unique_xmalloc_ptr<char> exp_string_reparse;
/* The expression we are watching, or NULL if not a watchpoint. */
expression_up 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. */
expression_up 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. */
value_ref_ptr val;
/* True if VAL is valid. If VAL_VALID is set but VAL is NULL,
then an error occurred reading the value. */
bool val_valid;
/* When watching the location of a bitfield, contains the offset and size of
the bitfield. Otherwise contains 0. */
int val_bitpos;
int val_bitsize;
/* 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 bool is_breakpoint (const struct breakpoint *bpt);
/* Return true if BPT is of any watchpoint kind, hardware or
software. */
extern bool is_watchpoint (const struct breakpoint *bpt);
/* Return true if BPT is a C++ exception catchpoint (catch
catch/throw/rethrow). */
extern bool is_exception_catchpoint (breakpoint *bp);
/* An instance of this type is used to represent all kinds of
tracepoints. */
struct tracepoint : public code_breakpoint
{
using code_breakpoint::code_breakpoint;
int breakpoint_hit (const struct bp_location *bl,
const address_space *aspace, CORE_ADDR bp_addr,
const target_waitstatus &ws) override;
void print_one_detail (struct ui_out *uiout) const override;
void print_mention () const override;
void print_recreate (struct ui_file *fp) const override;
/* Number of times this tracepoint should single-step and collect
additional data. */
long step_count = 0;
/* Number of times this tracepoint should be hit before
disabling/ending. */
int pass_count = 0;
/* The number of the tracepoint on the target. */
int number_on_target = 0;
/* The total space taken by all the trace frames for this
tracepoint. */
ULONGEST traceframe_usage = 0;
/* The static tracepoint marker id, if known. */
std::string 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 = 0;
};
/* The abstract base class for catchpoints. */
struct catchpoint : public breakpoint
{
/* If TEMP is true, then make the breakpoint temporary. If
COND_STRING is not NULL, then store it in the breakpoint. */
catchpoint (struct gdbarch *gdbarch, bool temp, const char *cond_string);
~catchpoint () override = 0;
};
/* 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. */
/* 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 *);
/* Build the (raw) bpstat chain for the stop information given by ASPACE,
BP_ADDR, and WS. Returns the head of the bpstat chain. */
extern bpstat *build_bpstat_chain (const address_space *aspace,
CORE_ADDR bp_addr,
const target_waitstatus &ws);
/* Get a bpstat associated with having just stopped at address
BP_ADDR in thread PTID. STOP_CHAIN may be supplied as a previously
computed stop chain or NULL, in which case the stop chain will be
computed using build_bpstat_chain.
Determine whether we stopped at a breakpoint, etc, or whether we
don't understand this stop. Result is a chain of bpstat's such
that:
if we don't understand the stop, the result is a null pointer.
if we understand why we stopped, the result is not null.
Each element of the chain refers to a particular breakpoint or
watchpoint at which we have stopped. (We may have stopped for
several reasons concurrently.)
Each element of the chain has valid next, breakpoint_at,
commands, FIXME??? fields.
watchpoints_triggered must be called beforehand to set up each
watchpoint's watchpoint_triggered value.
*/
extern bpstat *bpstat_stop_status (const address_space *aspace,
CORE_ADDR pc, thread_info *thread,
const target_waitstatus &ws,
bpstat *stop_chain = nullptr);
/* Like bpstat_stop_status, but clears all watchpoints'
watchpoint_triggered flag. Unlike with bpstat_stop_status, there's
no need to call watchpoint_triggered beforehand. You'll typically
use this variant when handling a known-non-watchpoint event, like a
fork or exec event. */
extern bpstat *bpstat_stop_status_nowatch (const address_space *aspace,
CORE_ADDR bp_addr,
thread_info *thread,
const 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. */
bool is_longjmp;
};
/* Tell what to do about this bpstat. */
struct bpstat_what bpstat_what (bpstat *);
/* Run breakpoint event callbacks associated with the breakpoints that
triggered. */
extern void bpstat_run_callbacks (bpstat *bs_head);
/* Find the bpstat associated with a breakpoint. NULL otherwise. */
bpstat *bpstat_find_breakpoint (bpstat *, struct breakpoint *);
/* True if a signal that we got in target_wait() was due to
circumstances explained by the bpstat; the signal is therefore not
random. */
extern bool bpstat_explains_signal (bpstat *, enum gdb_signal);
/* True if this bpstat causes a stop. */
extern bool bpstat_causes_stop (bpstat *);
/* True 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 bool bpstat_should_step ();
/* Print a message indicating what happened. */
extern enum print_stop_action bpstat_print (bpstat *bs, target_waitkind kind);
/* 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 *);
/* If BS indicates a breakpoint and this breakpoint has several code locations,
return the location number of BS, otherwise return 0. */
extern int bpstat_locno (const bpstat *bs);
/* Print BS breakpoint number optionally followed by a . and breakpoint locno.
For a breakpoint with only one code location, outputs the signed field
"bkptno" breakpoint number of BS (as returned by bpstat_num).
If BS has several code locations, outputs a '.' character followed by
the signed field "locno" (as returned by bpstat_locno). */
extern void print_num_locno (const bpstat *bs, struct ui_out *);
/* 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 bpstat
{
bpstat ();
bpstat (struct bp_location *bl, bpstat ***bs_link_pointer);
bpstat (const bpstat &);
bpstat &operator= (const bpstat &) = delete;
/* 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. */
bp_location_ref_ptr 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. */
counted_command_line commands;
/* Old value associated with a watchpoint. */
value_ref_ptr old_val;
/* True if this breakpoint tells us to print the frame. */
bool print;
/* True if this breakpoint tells us to stop. */
bool 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 (const address_space *,
CORE_ADDR);
/* Return true if an enabled breakpoint exists in the range defined by
ADDR and LEN, in ASPACE. */
extern int breakpoint_in_range_p (const address_space *aspace,
CORE_ADDR addr, ULONGEST len);
extern int moribund_breakpoint_here_p (const address_space *, CORE_ADDR);
extern int breakpoint_inserted_here_p (const address_space *,
CORE_ADDR);
extern int software_breakpoint_inserted_here_p (const address_space *,
CORE_ADDR);
/* Return non-zero iff there is a hardware breakpoint inserted at
PC. */
extern int hardware_breakpoint_inserted_here_p (const address_space *,
CORE_ADDR);
/* Check whether any location of BP is inserted at PC. */
extern int breakpoint_has_location_inserted_here (struct breakpoint *bp,
const address_space *aspace,
CORE_ADDR pc);
extern int single_step_breakpoint_inserted_here_p (const 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 (const address_space *,
CORE_ADDR addr,
ULONGEST len);
/* Returns true if {ASPACE1,ADDR1} and {ASPACE2,ADDR2} represent the
same breakpoint location. In most targets, this can only be true
if ASPACE1 matches ASPACE2. On targets that have global
breakpoints, the address space doesn't really matter. */
extern int breakpoint_address_match (const address_space *aspace1,
CORE_ADDR addr1,
const address_space *aspace2,
CORE_ADDR addr2);
extern void until_break_command (const char *, int, int);
/* Initialize a struct bp_location. */
extern void update_breakpoint_locations
(code_breakpoint *b,
struct program_space *filter_pspace,
gdb::array_view<const symtab_and_line> sals,
gdb::array_view<const symtab_and_line> sals_end);
extern void breakpoint_re_set (void);
extern void breakpoint_re_set_thread (struct breakpoint *);
extern void delete_breakpoint (struct breakpoint *);
struct breakpoint_deleter
{
void operator() (struct breakpoint *b) const
{
delete_breakpoint (b);
}
};
typedef std::unique_ptr<struct breakpoint, breakpoint_deleter> breakpoint_up;
extern breakpoint_up set_momentary_breakpoint
(struct gdbarch *, struct symtab_and_line, struct frame_id, enum bptype);
extern breakpoint_up 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 void breakpoint_auto_delete (bpstat *);
/* 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 (const char *, int);
extern void watch_command_wrapper (const char *, int, bool);
extern void awatch_command_wrapper (const char *, int, bool);
extern void rwatch_command_wrapper (const char *, int, bool);
extern void tbreak_command (const char *, int);
extern const struct breakpoint_ops code_breakpoint_ops;
/* 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 (const char *name, const char *docstring,
cmd_func_ftype *func,
completer_ftype *completer,
void *user_data_catch,
void *user_data_tcatch);
/* 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.
Takes ownership of B, and returns a non-owning reference to it. */
extern breakpoint *install_breakpoint
(int internal, std::unique_ptr<breakpoint> &&b, int update_gll);
/* Returns the breakpoint ops appropriate for use with with LOCSPEC
and according to IS_TRACEPOINT. Use this to ensure, for example,
that you pass the correct ops to create_breakpoint for probe
location specs. If LOCSPEC is NULL, returns
code_breakpoint_ops. */
extern const struct breakpoint_ops *breakpoint_ops_for_location_spec
(const location_spec *locspec, bool is_tracepoint);
/* 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
};
/* Set a breakpoint. This function is shared between CLI and MI
functions for setting a breakpoint at LOCSPEC.
This function has two major modes of operations, selected by the
PARSE_EXTRA parameter.
If PARSE_EXTRA is zero, LOCSPEC is just the breakpoint's location
spec, with condition, thread, and extra string specified by the
COND_STRING, THREAD, and EXTRA_STRING parameters.
If PARSE_EXTRA is non-zero, this function will attempt to extract
the condition, thread, and extra string from EXTRA_STRING, ignoring
the similarly named parameters.
If FORCE_CONDITION is true, the condition is accepted even when it is
invalid at all of the locations. However, if PARSE_EXTRA is non-zero,
the FORCE_CONDITION parameter is ignored and the corresponding argument
is parsed from EXTRA_STRING.
If INTERNAL is non-zero, the breakpoint number will be allocated
from the internal breakpoint count.
Returns true if any breakpoint was created; false otherwise. */
extern int create_breakpoint (struct gdbarch *gdbarch,
struct location_spec *locspec,
const char *cond_string, int thread,
const char *extra_string,
bool force_condition,
int parse_extra,
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);
/* Remove breakpoints of inferior INF. */
extern void remove_breakpoints_inf (inferior *inf);
/* 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 (struct thread_info *tp);
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
(const 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,
counted_command_line &&commands);
extern void breakpoint_set_silent (struct breakpoint *b, int silent);
/* Set the thread for this breakpoint. If THREAD is -1, make the
breakpoint work for any thread. Passing a value other than -1 for
THREAD should only be done if b->task is 0; it is not valid to try and
set both a thread and task restriction on a breakpoint. */
extern void breakpoint_set_thread (struct breakpoint *b, int thread);
/* Set the task for this breakpoint. If TASK is -1, make the breakpoint
work for any task. Passing a value other than -1 for TASK should only
be done if b->thread is -1; it is not valid to try and set both a thread
and task restriction on a breakpoint. */
extern void breakpoint_set_task (struct breakpoint *b, int task);
/* Clear the "inserted" flag in all breakpoints. */
extern void mark_breakpoints_out (void);
extern struct breakpoint *create_jit_event_breakpoint (struct gdbarch *,
CORE_ADDR);
extern struct breakpoint *create_solib_event_breakpoint (struct gdbarch *,
CORE_ADDR);
/* Create an solib event breakpoint at ADDRESS in the current program
space, and immediately try to insert it. Returns a pointer to the
breakpoint on success. Deletes the new breakpoint and returns NULL
if inserting the breakpoint fails. */
extern struct breakpoint *create_and_insert_solib_event_breakpoint
(struct gdbarch *gdbarch, CORE_ADDR address);
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);
/* Mark solib event breakpoints of the current program space with
delete at next stop disposition. */
extern void remove_solib_event_breakpoints_at_next_stop (void);
extern void disable_breakpoints_in_shlibs (void);
/* This function returns true if B is a catchpoint. */
extern bool is_catchpoint (struct breakpoint *b);
/* Shared helper function (MI and CLI) for creating and installing
a shared object event catchpoint. If IS_LOAD is true then
the events to be caught are load events, otherwise they are
unload events. If IS_TEMP is true the catchpoint is a
temporary one. If ENABLED is true the catchpoint is
created in an enabled state. */
extern void add_solib_catchpoint (const char *arg, bool is_load, bool is_temp,
bool enabled);
/* Create and insert a new software single step breakpoint for the
current thread. May be called multiple times; each time will add a
new location to the set of potential addresses the next instruction
is at. */
extern void insert_single_step_breakpoint (struct gdbarch *,
const address_space *,
CORE_ADDR);
/* Insert all software single step breakpoints for the current frame.
Return true if any software single step breakpoints are inserted,
otherwise, return false. */
extern int insert_single_step_breakpoints (struct gdbarch *);
/* Check whether any hardware watchpoints have triggered or not,
according to the target, and record it in each watchpoint's
'watchpoint_triggered' field. */
int watchpoints_triggered (const 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);
/* Return true if breakpoints should be inserted now. That'll be the
case if either:
- the target has global breakpoints.
- "breakpoint always-inserted" is on, and the target has
execution.
- threads are executing.
*/
extern int breakpoints_should_be_inserted_now (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.
If FORCE, define the condition even if it is invalid in
all of the breakpoint locations. */
extern void set_breakpoint_condition (struct breakpoint *b, const char *exp,
int from_tty, bool force);
/* Set break condition for the breakpoint with number BPNUM to EXP.
Raise an error if no breakpoint with the given number is found.
Also raise an error if the breakpoint already has stop conditions.
If FORCE, define the condition even if it is invalid in
all of the breakpoint locations. */
extern void set_breakpoint_condition (int bpnum, const char *exp,
int from_tty, bool force);
/* 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 false if not, true if we are. */
extern bool 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 (const char **arg,
number_or_range_parser *parser);
/* Return true if B is of tracepoint kind. */
extern bool is_tracepoint (const struct breakpoint *b);
/* Return a vector of all static tracepoints defined at ADDR. */
extern std::vector<breakpoint *> static_tracepoints_here (CORE_ADDR addr);
/* Create an instance of this to start registering breakpoint numbers
for a later "commands" command. */
class scoped_rbreak_breakpoints
{
public:
scoped_rbreak_breakpoints ();
~scoped_rbreak_breakpoints ();
DISABLE_COPY_AND_ASSIGN (scoped_rbreak_breakpoints);
};
/* Breakpoint linked list iterator. */
using breakpoint_iterator = next_iterator<breakpoint>;
/* Breakpoint linked list range. */
using breakpoint_range = iterator_range<breakpoint_iterator>;
/* Return a range to iterate over all breakpoints. */
breakpoint_range all_breakpoints ();
/* Breakpoint linked list range, safe against deletion of the current
breakpoint while iterating. */
using breakpoint_safe_range = basic_safe_range<breakpoint_range>;
/* Return a range to iterate over all breakpoints. This range is safe against
deletion of the current breakpoint while iterating. */
breakpoint_safe_range all_breakpoints_safe ();
/* Breakpoint filter to only keep tracepoints. */
struct tracepoint_filter
{
bool operator() (breakpoint *b)
{ return is_tracepoint (b); }
};
/* Breakpoint linked list iterator, filtering to only keep tracepoints. */
using tracepoint_iterator
= filtered_iterator<breakpoint_iterator, tracepoint_filter>;
/* Breakpoint linked list range, filtering to only keep tracepoints. */
using tracepoint_range = iterator_range<tracepoint_iterator>;
/* Return a range to iterate over all tracepoints. */
tracepoint_range all_tracepoints ();
/* Return a range to iterate over all breakpoint locations. */
const std::vector<bp_location *> &all_bp_locations ();
/* Nonzero if the specified PC cannot be a location where functions
have been inlined. */
extern int pc_at_non_inline_function (const address_space *aspace,
CORE_ADDR pc,
const target_waitstatus &ws);
extern int user_breakpoint_p (struct breakpoint *);
/* Return true if this breakpoint is pending, false if not. */
extern int pending_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 breakpoint_free_objfile (struct objfile *objfile);
extern const char *ep_parse_optional_if_clause (const char **arg);
/* Print the "Thread ID hit" part of "Thread ID hit Breakpoint N" to
UIOUT iff debugging multiple threads. */
extern void maybe_print_thread_hit_breakpoint (struct ui_out *uiout);
/* Print the specified breakpoint. */
extern void print_breakpoint (breakpoint *bp);
/* Command element for the 'commands' command. */
extern cmd_list_element *commands_cmd_element;
/* Whether to use the fixed output when printing information about a
multi-location breakpoint (see PR 9659). */
extern bool fix_multi_location_breakpoint_output_globally;
/* Whether to use the fixed output when printing information about
commands attached to a breakpoint. */
extern bool fix_breakpoint_script_output_globally;
/* Deal with "catch catch", "catch throw", and "catch rethrow" commands and
the MI equivalents. Sets up to catch events of type EX_EVENT. When
TEMPFLAG is true only the next matching event is caught after which the
catch-point is deleted. If REGEX is not NULL then only exceptions whose
type name matches REGEX will trigger the event. */
extern void catch_exception_event (enum exception_event_kind ex_event,
const char *regex, bool tempflag,
int from_tty);
/* A helper function that prints a shared library stopped event.
IS_CATCHPOINT is true if the event is due to a "catch load"
catchpoint, false otherwise. */
extern void print_solib_event (bool is_catchpoint);
/* Print a message describing any user-breakpoints set at PC. This
concerns with logical breakpoints, so we match program spaces, not
address spaces. */
extern void describe_other_breakpoints (struct gdbarch *,
struct program_space *, CORE_ADDR,
struct obj_section *, int);
/* Enable or disable a breakpoint location LOC. ENABLE
specifies whether to enable or disable. */
extern void enable_disable_bp_location (bp_location *loc, bool enable);
#endif /* !defined (BREAKPOINT_H) */
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