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This is gdbint.info, produced by makeinfo version 4.8 from./gdbint.texinfo.INFO-DIR-SECTION Software developmentSTART-INFO-DIR-ENTRY* Gdb-Internals: (gdbint). The GNU debugger's internals.END-INFO-DIR-ENTRYCopyright (C) 1990, 1991, 1992, 1993, 1994, 1996, 1998, 1999, 2000,2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010 Free SoftwareFoundation, Inc. Contributed by Cygnus Solutions. Written by JohnGilmore. Second Edition by Stan Shebs.Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.1 orany later version published by the Free Software Foundation; with noInvariant Sections, with no Front-Cover Texts, and with no Back-CoverTexts. A copy of the license is included in the section entitled "GNUFree 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 SoftwareFoundation, Inc. Contributed by Cygnus Solutions. Written by JohnGilmore. Second Edition by Stan Shebs.Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.1 orany later version published by the Free Software Foundation; with noInvariant Sections, with no Front-Cover Texts, and with no Back-CoverTexts. A copy of the license is included in the section entitled "GNUFree Documentation License".File: gdbint.info, Node: GDB Observers, Next: GNU Free Documentation License, Prev: Hints, Up: TopAppendix A GDB Currently available observers********************************************A.1 Implementation rationale============================An "observer" is an entity which is interested in being notified whenGDB reaches certain states, or certain events occur in GDB. The entitybeing observed is called the "subject". To receive notifications, theobserver attaches a callback to the subject. One subject can haveseveral observers.`observer.c' implements an internal generic low-level eventnotification mechanism. This generic event notification mechanism isthen re-used to implement the exported high-level notificationmanagement routines for all possible notifications.The current implementation of the generic observer provides supportfor contextual data. This contextual data is given to the subject whenattaching the callback. In return, the subject will provide thiscontextual data back to the observer as a parameter of the callback.Note that the current support for the contextual data is onlypartial, as it lacks a mechanism that would deallocate this data whenthe callback is detached. This is not a problem so far, as thiscontextual data is only used internally to hold a function pointer.Later on, if a certain observer needs to provide support for user-levelcontextual data, then the generic notification mechanism will need to beenhanced to allow the observer to provide a routine to deallocate thedata when attaching the callback.The observer implementation is also currently not reentrant. Inparticular, it is therefore not possible to call the attach or detachroutines during a notification.A.2 Debugging=============Observer notifications can be traced using the command `set debugobserver 1' (*note Optional messages about internal happenings:(gdb)Debugging Output.).A.3 `normal_stop' Notifications===============================GDB notifies all `normal_stop' observers when the inferior executionhas just stopped, the associated messages and annotations have beenprinted, and the control is about to be returned to the user.Note that the `normal_stop' notification is not emitted when theexecution stops due to a breakpoint, and this breakpoint has acondition that is not met. If the breakpoint has any associatedcommands list, the commands are executed after the notification isemitted.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 whenever EVENT occurs, return the observer.-- Function: extern void observer_detach_EVENT (struct observer*OBSERVER);Remove OBSERVER from the list of observers to be notified whenEVENT 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 thebreakpoints were are stopped at, if any. Second argumentPRINT_FRAME non-zero means display the location where the inferiorhas 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 decidedto debug a different program, or the program he was debugging hasbeen modified since being loaded by the debugger (by beingrecompiled, for instance).-- Function: void inferior_created (struct target_ops *OBJFILE, intFROM_TTY)GDB has just connected to an inferior. For `run', GDB calls thisobserver while the inferior is still stopped at the entry-pointinstruction. For `attach' and `core', GDB calls this observerimmediately after connecting to the inferior, and before anyinformation on the inferior has been printed.-- Function: void solib_loaded (struct so_list *SOLIB)The shared library specified by SOLIB has been loaded. Note thatwhen GDB calls this observer, the library's symbols probablyhaven't been loaded yet.-- Function: void solib_unloaded (struct so_list *SOLIB)The shared library specified by SOLIB has been unloaded. Notethat when GDB calls this observer, the library's symbols have notbeen unloaded yet, and thus are still available.-- Function: void new_objfile (struct objfile *OBJFILE)The symbol file specified by OBJFILE has been loaded. Called withOBJFILE equal to `NULL' to indicate previously loaded symbol tabledata 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 argumentindicates that GDB is removing the thread from its tables withoutwanting to notify the user about it.-- Function: void thread_stop_requested (ptid_t PTID)An explicit stop request was issued to PTID. If PTID equalsMINUS_ONE_PTID, the request applied to all threads. If`ptid_is_pid(ptid)' returns true, the request applied to allthreads of the process pointed at by PTID. Otherwise, the requestapplied to the single thread pointed at by PTID.-- Function: void target_resumed (ptid_t PTID)The target was resumed. The PTID parameter specifies which threadwas 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 thenumber of the newly-created breakpoint.-- Function: void breakpoint_deleted (int BPNUM)A breakpoint has been destroyed. The argument BPNUM is the numberof the newly-destroyed breakpoint.-- Function: void breakpoint_modified (int BPNUM)A breakpoint has been modified in some way. The argument BPNUM isthe number of the modified breakpoint.-- Function: void tracepoint_created (int TPNUM)A new tracepoint has been created. The argument TPNUM is thenumber of the newly-created tracepoint.-- Function: void tracepoint_deleted (int TPNUM)A tracepoint has been destroyed. The argument TPNUM is the numberof the newly-destroyed tracepoint.-- Function: void tracepoint_modified (int TPNUM)A tracepoint has been modified in some way. The argument TPNUM isthe number of the modified tracepoint.-- Function: void architecture_changed (struct gdbarch *NEWARCH)The current architecture has changed. The argument NEWARCH is apointer to the new architecture.-- Function: void thread_ptid_changed (ptid_t OLD_PTID, ptid_tNEW_PTID)The thread's ptid has changed. The OLD_PTID parameter specifiesthe 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, constbfd_byte *DATA)Bytes from DATA to DATA + LEN have been written to the currentinferior at ADDR.-- Function: void test_notification (int SOMEARG)This observer is used for internal testing. Do not use. Seetestsuite/gdb.gdb/observer.exp.File: gdbint.info, Node: GNU Free Documentation License, Next: Index, Prev: GDB Observers, Up: TopAppendix B GNU Free Documentation License*****************************************Version 1.2, November 2002Copyright (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 copiesof this license document, but changing it is not allowed.0. PREAMBLEThe purpose of this License is to make a manual, textbook, or otherfunctional and useful document "free" in the sense of freedom: toassure everyone the effective freedom to copy and redistribute it,with or without modifying it, either commercially ornoncommercially. Secondarily, this License preserves for theauthor and publisher a way to get credit for their work, while notbeing considered responsible for modifications made by others.This License is a kind of "copyleft", which means that derivativeworks of the document must themselves be free in the same sense.It complements the GNU General Public License, which is a copyleftlicense designed for free software.We have designed this License in order to use it for manuals forfree software, because free software needs free documentation: afree program should come with manuals providing the same freedomsthat the software does. But this License is not limited tosoftware manuals; it can be used for any textual work, regardlessof subject matter or whether it is published as a printed book.We recommend this License principally for works whose purpose isinstruction or reference.1. APPLICABILITY AND DEFINITIONSThis License applies to any manual or other work, in any medium,that contains a notice placed by the copyright holder saying itcan be distributed under the terms of this License. Such a noticegrants a world-wide, royalty-free license, unlimited in duration,to use that work under the conditions stated herein. The"Document", below, refers to any such manual or work. Any memberof the public is a licensee, and is addressed as "you". Youaccept the license if you copy, modify or distribute the work in away requiring permission under copyright law.A "Modified Version" of the Document means any work containing theDocument or a portion of it, either copied verbatim, or withmodifications and/or translated into another language.A "Secondary Section" is a named appendix or a front-matter sectionof the Document that deals exclusively with the relationship of thepublishers or authors of the Document to the Document's overallsubject (or to related matters) and contains nothing that couldfall directly within that overall subject. (Thus, if the Documentis in part a textbook of mathematics, a Secondary Section may notexplain any mathematics.) The relationship could be a matter ofhistorical connection with the subject or with related matters, orof legal, commercial, philosophical, ethical or political positionregarding them.The "Invariant Sections" are certain Secondary Sections whosetitles are designated, as being those of Invariant Sections, inthe notice that says that the Document is released under thisLicense. If a section does not fit the above definition ofSecondary then it is not allowed to be designated as Invariant.The Document may contain zero Invariant Sections. If the Documentdoes not identify any Invariant Sections then there are none.The "Cover Texts" are certain short passages of text that arelisted, as Front-Cover Texts or Back-Cover Texts, in the noticethat says that the Document is released under this License. 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Acopy that is not "Transparent" is called "Opaque".Examples of suitable formats for Transparent copies include plainASCII without markup, Texinfo input format, LaTeX input format,SGML or XML using a publicly available DTD, andstandard-conforming simple HTML, PostScript or PDF designed forhuman modification. Examples of transparent image formats includePNG, XCF and JPG. Opaque formats include proprietary formats thatcan be read and edited only by proprietary word processors, SGML orXML for which the DTD and/or processing tools are not generallyavailable, and the machine-generated HTML, PostScript or PDFproduced by some word processors for output purposes only.The "Title Page" means, for a printed book, the title page itself,plus such following pages as are needed to hold, legibly, thematerial this License requires to appear in the title page. 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TheseWarranty Disclaimers are considered to be included by reference inthis License, but only as regards disclaiming warranties: any otherimplication that these Warranty Disclaimers may have is void andhas no effect on the meaning of this License.2. VERBATIM COPYINGYou may copy and distribute the Document in any medium, eithercommercially or noncommercially, provided that this License, thecopyright notices, and the license notice saying this Licenseapplies to the Document are reproduced in all copies, and that youadd no other conditions whatsoever to those of this License. Youmay not use technical measures to obstruct or control the readingor further copying of the copies you make or distribute. However,you may accept compensation in exchange for copies. If youdistribute a large enough number of copies you must also followthe conditions in section 3.You may also lend copies, under the same conditions stated above,and you may publicly display copies.3. 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Ifthe Document does not specify a version number of this License,you may choose any version ever published (not as a draft) by theFree Software Foundation.B.1 ADDENDUM: How to use this License for your documents========================================================To use this License in a document you have written, include a copy ofthe License in the document and put the following copyright and licensenotices just after the title page:Copyright (C) YEAR YOUR NAME.Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2or any later version published by the Free Software Foundation;with no Invariant Sections, no Front-Cover Texts, and no Back-CoverTexts. A copy of the license is included in the section entitled ``GNUFree Documentation License''.If you have Invariant Sections, Front-Cover Texts and Back-CoverTexts, replace the "with...Texts." line with this:with the Invariant Sections being LIST THEIR TITLES, withthe Front-Cover Texts being LIST, and with the Back-Cover Textsbeing LIST.If you have Invariant Sections without Cover Texts, or some othercombination of the three, merge those two alternatives to suit thesituation.If your document contains nontrivial examples of program code, werecommend releasing these examples in parallel under your choice offree software license, such as the GNU General Public License, topermit their use in free software.File: gdbint.info, Node: Index, Prev: GNU Free Documentation License, Up: TopIndex*****
