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This is gdbint.info, produced by makeinfo version 4.8 from
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INFO-DIR-SECTION Software development
START-INFO-DIR-ENTRY
* Gdb-Internals: (gdbint). The GNU debugger's internals.
END-INFO-DIR-ENTRY
Copyright (C) 1990, 1991, 1992, 1993, 1994, 1996, 1998, 1999, 2000,
2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010 Free Software
Foundation, Inc. Contributed by Cygnus Solutions. Written by John
Gilmore. Second Edition by Stan Shebs.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1 or
any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
Texts. A copy of the license is included in the section entitled "GNU
Free Documentation License".
This file documents the internals of the GNU debugger GDB.
Copyright (C) 1990, 1991, 1992, 1993, 1994, 1996, 1998, 1999, 2000,
2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010 Free Software
Foundation, Inc. Contributed by Cygnus Solutions. Written by John
Gilmore. Second Edition by Stan Shebs.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1 or
any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
Texts. A copy of the license is included in the section entitled "GNU
Free Documentation License".
File: gdbint.info, Node: GDB Observers, Next: GNU Free Documentation License, Prev: Hints, Up: Top
Appendix A GDB Currently available observers
********************************************
A.1 Implementation rationale
============================
An "observer" is an entity which is interested in being notified when
GDB reaches certain states, or certain events occur in GDB. The entity
being observed is called the "subject". To receive notifications, the
observer attaches a callback to the subject. One subject can have
several observers.
`observer.c' implements an internal generic low-level event
notification mechanism. This generic event notification mechanism is
then re-used to implement the exported high-level notification
management routines for all possible notifications.
The current implementation of the generic observer provides support
for contextual data. This contextual data is given to the subject when
attaching the callback. In return, the subject will provide this
contextual data back to the observer as a parameter of the callback.
Note that the current support for the contextual data is only
partial, as it lacks a mechanism that would deallocate this data when
the callback is detached. This is not a problem so far, as this
contextual data is only used internally to hold a function pointer.
Later on, if a certain observer needs to provide support for user-level
contextual data, then the generic notification mechanism will need to be
enhanced to allow the observer to provide a routine to deallocate the
data when attaching the callback.
The observer implementation is also currently not reentrant. In
particular, it is therefore not possible to call the attach or detach
routines during a notification.
A.2 Debugging
=============
Observer notifications can be traced using the command `set debug
observer 1' (*note Optional messages about internal happenings:
(gdb)Debugging Output.).
A.3 `normal_stop' Notifications
===============================
GDB notifies all `normal_stop' observers when the inferior execution
has just stopped, the associated messages and annotations have been
printed, and the control is about to be returned to the user.
Note that the `normal_stop' notification is not emitted when the
execution stops due to a breakpoint, and this breakpoint has a
condition that is not met. If the breakpoint has any associated
commands list, the commands are executed after the notification is
emitted.
The following interfaces are available to manage observers:
-- Function: extern struct observer *observer_attach_EVENT
(observer_EVENT_ftype *F)
Using the function F, create an observer that is notified when
ever EVENT occurs, return the observer.
-- Function: extern void observer_detach_EVENT (struct observer
*OBSERVER);
Remove OBSERVER from the list of observers to be notified when
EVENT occurs.
-- Function: extern void observer_notify_EVENT (void);
Send a notification to all EVENT observers.
The following observable events are defined:
-- Function: void normal_stop (struct bpstats *BS, int PRINT_FRAME)
The inferior has stopped for real. The BS argument describes the
breakpoints were are stopped at, if any. Second argument
PRINT_FRAME non-zero means display the location where the inferior
has stopped.
-- Function: void target_changed (struct target_ops *TARGET)
The target's register contents have changed.
-- Function: void executable_changed (void)
The executable being debugged by GDB has changed: The user decided
to debug a different program, or the program he was debugging has
been modified since being loaded by the debugger (by being
recompiled, for instance).
-- Function: void inferior_created (struct target_ops *OBJFILE, int
FROM_TTY)
GDB has just connected to an inferior. For `run', GDB calls this
observer while the inferior is still stopped at the entry-point
instruction. For `attach' and `core', GDB calls this observer
immediately after connecting to the inferior, and before any
information on the inferior has been printed.
-- Function: void solib_loaded (struct so_list *SOLIB)
The shared library specified by SOLIB has been loaded. Note that
when GDB calls this observer, the library's symbols probably
haven't been loaded yet.
-- Function: void solib_unloaded (struct so_list *SOLIB)
The shared library specified by SOLIB has been unloaded. Note
that when GDB calls this observer, the library's symbols have not
been unloaded yet, and thus are still available.
-- Function: void new_objfile (struct objfile *OBJFILE)
The symbol file specified by OBJFILE has been loaded. Called with
OBJFILE equal to `NULL' to indicate previously loaded symbol table
data has now been invalidated.
-- Function: void new_thread (struct thread_info *T)
The thread specified by T has been created.
-- Function: void thread_exit (struct thread_info *T, int SILENT)
The thread specified by T has exited. The SILENT argument
indicates that GDB is removing the thread from its tables without
wanting to notify the user about it.
-- Function: void thread_stop_requested (ptid_t PTID)
An explicit stop request was issued to PTID. If PTID equals
MINUS_ONE_PTID, the request applied to all threads. If
`ptid_is_pid(ptid)' returns true, the request applied to all
threads of the process pointed at by PTID. Otherwise, the request
applied to the single thread pointed at by PTID.
-- Function: void target_resumed (ptid_t PTID)
The target was resumed. The PTID parameter specifies which thread
was resume, and may be RESUME_ALL if all threads are resumed.
-- Function: void about_to_proceed (void)
The target is about to be proceeded.
-- Function: void breakpoint_created (int BPNUM)
A new breakpoint has been created. The argument BPNUM is the
number of the newly-created breakpoint.
-- Function: void breakpoint_deleted (int BPNUM)
A breakpoint has been destroyed. The argument BPNUM is the number
of the newly-destroyed breakpoint.
-- Function: void breakpoint_modified (int BPNUM)
A breakpoint has been modified in some way. The argument BPNUM is
the number of the modified breakpoint.
-- Function: void tracepoint_created (int TPNUM)
A new tracepoint has been created. The argument TPNUM is the
number of the newly-created tracepoint.
-- Function: void tracepoint_deleted (int TPNUM)
A tracepoint has been destroyed. The argument TPNUM is the number
of the newly-destroyed tracepoint.
-- Function: void tracepoint_modified (int TPNUM)
A tracepoint has been modified in some way. The argument TPNUM is
the number of the modified tracepoint.
-- Function: void architecture_changed (struct gdbarch *NEWARCH)
The current architecture has changed. The argument NEWARCH is a
pointer to the new architecture.
-- Function: void thread_ptid_changed (ptid_t OLD_PTID, ptid_t
NEW_PTID)
The thread's ptid has changed. The OLD_PTID parameter specifies
the old value, and NEW_PTID specifies the new value.
-- Function: void inferior_appeared (int PID)
GDB has attached to a new inferior identified by PID.
-- Function: void inferior_exit (int PID)
Either GDB detached from the inferior, or the inferior exited.
The argument PID identifies the inferior.
-- Function: void memory_changed (CORE_ADDR ADDR, int LEN, const
bfd_byte *DATA)
Bytes from DATA to DATA + LEN have been written to the current
inferior at ADDR.
-- Function: void test_notification (int SOMEARG)
This observer is used for internal testing. Do not use. See
testsuite/gdb.gdb/observer.exp.
File: gdbint.info, Node: GNU Free Documentation License, Next: Index, Prev: GDB Observers, Up: Top
Appendix B GNU Free Documentation License
*****************************************
Version 1.2, November 2002
Copyright (C) 2000,2001,2002 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Everyone is permitted to copy and distribute verbatim copies
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The purpose of this License is to make a manual, textbook, or other
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This License is a kind of "copyleft", which means that derivative
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We have designed this License in order to use it for manuals for
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B.1 ADDENDUM: How to use this License for your documents
========================================================
To use this License in a document you have written, include a copy of
the License in the document and put the following copyright and license
notices just after the title page:
Copyright (C) YEAR YOUR NAME.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
Texts. A copy of the license is included in the section entitled ``GNU
Free Documentation License''.
If you have Invariant Sections, Front-Cover Texts and Back-Cover
Texts, replace the "with...Texts." line with this:
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If you have Invariant Sections without Cover Texts, or some other
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File: gdbint.info, Node: Index, Prev: GNU Free Documentation License, Up: Top
Index
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