596 lines
22 KiB
Text
Executable file
596 lines
22 KiB
Text
Executable file
What has changed since GDB-3.5?
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(Organized release by release)
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*** Changes in GDB-4.6:
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* Better support for C++ function names
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GDB now accepts as input the "demangled form" of C++ overloaded function
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names and member function names, and can do command completion on such names
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(using TAB, TAB-TAB, and ESC-?). The names have to be quoted with a pair of
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single quotes. Examples are 'func (int, long)' and 'obj::operator==(obj&)'.
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Make use of command completion, it is your friend.
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GDB also now accepts a variety of C++ mangled symbol formats. They are
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the GNU g++ style, the Cfront (ARM) style, and the Lucid (lcc) style.
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You can tell GDB which format to use by doing a 'set demangle-style {gnu,
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lucid, cfront, auto}'. 'gnu' is the default. Do a 'set demangle-style foo'
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for the list of formats.
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* G++ symbol mangling problem
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Recent versions of gcc have a bug in how they emit debugging information for
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C++ methods (when using dbx-style stabs). The file 'gcc.patch' (in this
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directory) can be applied to gcc to fix the problem. Alternatively, if you
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can't fix gcc, you can #define GCC_MANGLE_BUG when compling gdb/symtab.c. The
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usual symptom is difficulty with setting breakpoints on methods. GDB complains
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about the method being non-existent. (We believe that version 2.2.2 of GCC has
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this problem.)
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* New 'maintenance' command
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All of the commands related to hacking GDB internals have been moved out of
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the main command set, and now live behind the 'maintenance' command. This
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can also be abbreviated as 'mt'. The following changes were made:
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dump-me -> maintenance dump-me
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info all-breakpoints -> maintenance info breakpoints
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printmsyms -> maintenance print msyms
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printobjfiles -> maintenance print objfiles
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printpsyms -> maintenance print psymbols
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printsyms -> maintenance print symbols
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The following commands are new:
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maintenance demangle Call internal GDB demangler routine to
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demangle a C++ link name and prints the result.
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maintenance print type Print a type chain for a given symbol
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* Change to .gdbinit file processing
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We now read the $HOME/.gdbinit file before processing the argv arguments
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(e.g. reading symbol files or core files). This allows global parameters to
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be set, which will apply during the symbol reading. The ./.gdbinit is still
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read after argv processing.
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* New hosts supported
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Solaris-2.0 !!! sparc-sun-solaris2 or sun4sol2
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Linux support i386-unknown-linux or linux
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We are also including code to support the HP/PA running BSD and HPUX. This
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is almost guaranteed not to work, as we didn't have time to test or build it
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for this release. We are including it so that the more adventurous (or
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masochistic) of you can play with it. We also had major problems with the
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fact that the compiler that we got from HP doesn't support the -g option.
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It costs extra.
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* New targets supported
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Hitachi H8/300 h8300-hitachi-hms or h8300hms
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* More smarts about finding #include files
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GDB now remembers the compilation directory for all include files, and for
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all files from which C is generated (like yacc and lex sources). This
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greatly improves GDB's ability to find yacc/lex sources, and include files,
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especially if you are debugging your program from a directory different from
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the one that contains your sources.
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We also fixed a bug which caused difficulty with listing and setting
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breakpoints in include files which contain C code. (In the past, you had to
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try twice in order to list an include file that you hadn't looked at before.)
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* Interesting infernals change
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GDB now deals with arbitrary numbers of sections, where the symbols for each
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section must be relocated relative to that section's landing place in the
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target's address space. This work was needed to support ELF with embedded
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stabs used by Solaris-2.0.
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* Bug fixes (of course!)
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There have been loads of fixes for the following things:
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mips, rs6000, 29k/udi, m68k, g++, type handling, elf/dwarf, m88k,
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i960, stabs, DOS(GO32), procfs, etc...
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See the ChangeLog for details.
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*** Changes in GDB-4.5:
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* New machines supported (host and target)
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IBM RS6000 running AIX rs6000-ibm-aix or rs6000
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SGI Irix-4.x mips-sgi-irix4 or iris4
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* New malloc package
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GDB now uses a new memory manager called mmalloc, based on gmalloc.
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Mmalloc is capable of handling mutiple heaps of memory. It is also
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capable of saving a heap to a file, and then mapping it back in later.
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This can be used to greatly speedup the startup of GDB by using a
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pre-parsed symbol table which lives in a mmalloc managed heap. For
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more details, please read mmalloc/mmalloc.texi.
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* info proc
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The 'info proc' command (SVR4 only) has been enhanced quite a bit. See
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'help info proc' for details.
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* MIPS ecoff symbol table format
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The code that reads MIPS symbol table format is now supported on all hosts.
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Thanks to MIPS for releasing the sym.h and symconst.h files to make this
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possible.
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* File name changes for MS-DOS
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Many files in the config directories have been renamed to make it easier to
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support GDB on MS-DOSe systems (which have very restrictive file name
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conventions :-( ). MS-DOSe host support (under DJ Delorie's GO32
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environment) is close to working but has some remaining problems. Note
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that debugging of DOS programs is not supported, due to limitations
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in the ``operating system'', but it can be used to host cross-debugging.
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* Cross byte order fixes
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Many fixes have been made to support cross debugging of Sparc and MIPS
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targets from hosts whose byte order differs.
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* New -mapped and -readnow options
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If memory-mapped files are available on your system through the 'mmap'
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system call, you can use the -mapped option on the `file' or
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`symbol-file' commands to cause GDB to write the symbols from your
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program into a reusable file. If the program you are debugging is
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called `/path/fred', the mapped symbol file will be `./fred.syms'.
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Future GDB debugging sessions will notice the presence of this file,
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and will quickly map in symbol information from it, rather than reading
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the symbol table from the executable program. Using the '-mapped'
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option in a GDB `file' or `symbol-file' command has the same effect as
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starting GDB with the '-mapped' command-line option.
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You can cause GDB to read the entire symbol table immediately by using
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the '-readnow' option with any of the commands that load symbol table
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information (or on the GDB command line). This makes the command
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slower, but makes future operations faster.
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The -mapped and -readnow options are typically combined in order to
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build a `fred.syms' file that contains complete symbol information.
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A simple GDB invocation to do nothing but build a `.syms' file for future
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use is:
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gdb -batch -nx -mapped -readnow programname
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The `.syms' file is specific to the host machine on which GDB is run.
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It holds an exact image of GDB's internal symbol table. It cannot be
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shared across multiple host platforms.
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* longjmp() handling
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GDB is now capable of stepping and nexting over longjmp(), _longjmp(), and
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siglongjmp() without losing control. This feature has not yet been ported to
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all systems. It currently works on many 386 platforms, all MIPS-based
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platforms (SGI, DECstation, etc), and Sun3/4.
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* Solaris 2.0
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Preliminary work has been put in to support the new Solaris OS from Sun. At
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this time, it can control and debug processes, but it is not capable of
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reading symbols.
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* Bug fixes
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As always, many many bug fixes. The major areas were with g++, and mipsread.
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People using the MIPS-based platforms should experience fewer mysterious
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crashes and trashed symbol tables.
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*** Changes in GDB-4.4:
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* New machines supported (host and target)
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SCO Unix on i386 IBM PC clones i386-sco-sysv or i386sco
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(except core files)
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BSD Reno on Vax vax-dec-bsd
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Ultrix on Vax vax-dec-ultrix
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* New machines supported (target)
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AMD 29000 embedded, using EBMON a29k-none-none
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* C++ support
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GDB continues to improve its handling of C++. `References' work better.
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The demangler has also been improved, and now deals with symbols mangled as
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per the Annotated C++ Reference Guide.
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GDB also now handles `stabs' symbol information embedded in MIPS
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`ecoff' symbol tables. Since the ecoff format was not easily
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extensible to handle new languages such as C++, this appeared to be a
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good way to put C++ debugging info into MIPS binaries. This option
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will be supported in the GNU C compiler, version 2, when it is
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released.
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* New features for SVR4
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GDB now handles SVR4 shared libraries, in the same fashion as SunOS
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shared libraries. Debugging dynamically linked programs should present
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only minor differences from debugging statically linked programs.
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The `info proc' command will print out information about any process
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on an SVR4 system (including the one you are debugging). At the moment,
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it prints the address mappings of the process.
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If you bring up GDB on another SVR4 system, please send mail to
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bug-gdb@prep.ai.mit.edu to let us know what changes were reqired (if any).
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* Better dynamic linking support in SunOS
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Reading symbols from shared libraries which contain debugging symbols
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now works properly. However, there remain issues such as automatic
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skipping of `transfer vector' code during function calls, which
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make it harder to debug code in a shared library, than to debug the
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same code linked statically.
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* New Getopt
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GDB is now using the latest `getopt' routines from the FSF. This
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version accepts the -- prefix for options with long names. GDB will
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continue to accept the old forms (-option and +option) as well.
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Various single letter abbreviations for options have been explicity
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added to the option table so that they won't get overshadowed in the
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future by other options that begin with the same letter.
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* Bugs fixed
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The `cleanup_undefined_types' bug that many of you noticed has been squashed.
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Many assorted bugs have been handled. Many more remain to be handled.
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See the various ChangeLog files (primarily in gdb and bfd) for details.
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*** Changes in GDB-4.3:
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* New machines supported (host and target)
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Amiga 3000 running Amix m68k-cbm-svr4 or amix
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NCR 3000 386 running SVR4 i386-ncr-svr4 or ncr3000
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Motorola Delta 88000 running Sys V m88k-motorola-sysv or delta88
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* Almost SCO Unix support
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We had hoped to support:
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SCO Unix on i386 IBM PC clones i386-sco-sysv or i386sco
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(except for core file support), but we discovered very late in the release
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that it has problems with process groups that render gdb unusable. Sorry
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about that. I encourage people to fix it and post the fixes.
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* Preliminary ELF and DWARF support
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GDB can read ELF object files on System V Release 4, and can handle
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debugging records for C, in DWARF format, in ELF files. This support
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is preliminary. If you bring up GDB on another SVR4 system, please
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send mail to bug-gdb@prep.ai.mit.edu to let us know what changes were
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reqired (if any).
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* New Readline
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GDB now uses the latest `readline' library. One user-visible change
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is that two tabs will list possible command completions, which previously
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required typing M-? (meta-question mark, or ESC ?).
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* Bugs fixed
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The `stepi' bug that many of you noticed has been squashed.
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Many bugs in C++ have been handled. Many more remain to be handled.
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See the various ChangeLog files (primarily in gdb and bfd) for details.
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* State of the MIPS world (in case you wondered):
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GDB can understand the symbol tables emitted by the compilers
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supplied by most vendors of MIPS-based machines, including DEC. These
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symbol tables are in a format that essentially nobody else uses.
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Some versions of gcc come with an assembler post-processor called
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mips-tfile. This program is required if you want to do source-level
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debugging of gcc-compiled programs. I believe FSF does not ship
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mips-tfile with gcc version 1, but it will eventually come with gcc
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version 2.
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Debugging of g++ output remains a problem. g++ version 1.xx does not
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really support it at all. (If you're lucky, you should be able to get
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line numbers and stack traces to work, but no parameters or local
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variables.) With some work it should be possible to improve the
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situation somewhat.
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When gcc version 2 is released, you will have somewhat better luck.
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However, even then you will get confusing results for inheritance and
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methods.
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We will eventually provide full debugging of g++ output on
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DECstations. This will probably involve some kind of stabs-in-ecoff
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encapulation, but the details have not been worked out yet.
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*** Changes in GDB-4.2:
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* Improved configuration
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Only one copy of `configure' exists now, and it is not self-modifying.
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Porting BFD is simpler.
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* Stepping improved
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The `step' and `next' commands now only stop at the first instruction
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of a source line. This prevents the multiple stops that used to occur
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in switch statements, for-loops, etc. `Step' continues to stop if a
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function that has debugging information is called within the line.
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* Bug fixing
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Lots of small bugs fixed. More remain.
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* New host supported (not target)
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Intel 386 PC clone running Mach i386-none-mach
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*** Changes in GDB-4.1:
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* Multiple source language support
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GDB now has internal scaffolding to handle several source languages.
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It determines the type of each source file from its filename extension,
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and will switch expression parsing and number formatting to match the
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language of the function in the currently selected stack frame.
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You can also specifically set the language to be used, with
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`set language c' or `set language modula-2'.
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* GDB and Modula-2
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GDB now has preliminary support for the GNU Modula-2 compiler,
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currently under development at the State University of New York at
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Buffalo. Development of both GDB and the GNU Modula-2 compiler will
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continue through the fall of 1991 and into 1992.
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Other Modula-2 compilers are currently not supported, and attempting to
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debug programs compiled with them will likely result in an error as the
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symbol table is read. Feel free to work on it, though!
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There are hooks in GDB for strict type checking and range checking,
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in the `Modula-2 philosophy', but they do not currently work.
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* set write on/off
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GDB can now write to executable and core files (e.g. patch
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a variable's value). You must turn this switch on, specify
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the file ("exec foo" or "core foo"), *then* modify it, e.g.
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by assigning a new value to a variable. Modifications take
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effect immediately.
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* Automatic SunOS shared library reading
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When you run your program, GDB automatically determines where its
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shared libraries (if any) have been loaded, and reads their symbols.
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The `share' command is no longer needed. This also works when
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examining core files.
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* set listsize
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You can specify the number of lines that the `list' command shows.
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The default is 10.
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* New machines supported (host and target)
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SGI Iris (MIPS) running Irix V3: mips-sgi-irix or iris
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Sony NEWS (68K) running NEWSOS 3.x: m68k-sony-sysv or news
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Ultracomputer (29K) running Sym1: a29k-nyu-sym1 or ultra3
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* New hosts supported (not targets)
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IBM RT/PC: romp-ibm-aix or rtpc
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* New targets supported (not hosts)
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AMD 29000 embedded with COFF a29k-none-coff
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AMD 29000 embedded with a.out a29k-none-aout
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Ultracomputer remote kernel debug a29k-nyu-kern
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* New remote interfaces
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AMD 29000 Adapt
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AMD 29000 Minimon
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*** Changes in GDB-4.0:
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* New Facilities
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Wide output is wrapped at good places to make the output more readable.
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Gdb now supports cross-debugging from a host machine of one type to a
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target machine of another type. Communication with the target system
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is over serial lines. The ``target'' command handles connecting to the
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remote system; the ``load'' command will download a program into the
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remote system. Serial stubs for the m68k and i386 are provided. Gdb
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also supports debugging of realtime processes running under VxWorks,
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using SunRPC Remote Procedure Calls over TCP/IP to talk to a debugger
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stub on the target system.
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New CPUs supported include the AMD 29000 and Intel 960.
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GDB now reads object files and symbol tables via a ``binary file''
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library, which allows a single copy of GDB to debug programs of multiple
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object file types such as a.out and coff.
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There is now a GDB reference card in "doc/refcard.tex". (Make targets
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refcard.dvi and refcard.ps are available to format it).
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* Control-Variable user interface simplified
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All variables that control the operation of the debugger can be set
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by the ``set'' command, and displayed by the ``show'' command.
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For example, ``set prompt new-gdb=>'' will change your prompt to new-gdb=>.
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``Show prompt'' produces the response:
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Gdb's prompt is new-gdb=>.
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What follows are the NEW set commands. The command ``help set'' will
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print a complete list of old and new set commands. ``help set FOO''
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will give a longer description of the variable FOO. ``show'' will show
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all of the variable descriptions and their current settings.
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confirm on/off: Enables warning questions for operations that are
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hard to recover from, e.g. rerunning the program while
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it is already running. Default is ON.
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editing on/off: Enables EMACS style command line editing
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of input. Previous lines can be recalled with
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control-P, the current line can be edited with control-B,
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you can search for commands with control-R, etc.
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Default is ON.
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history filename NAME: NAME is where the gdb command history
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will be stored. The default is .gdb_history,
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or the value of the environment variable
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GDBHISTFILE.
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history size N: The size, in commands, of the command history. The
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default is 256, or the value of the environment variable
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HISTSIZE.
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history save on/off: If this value is set to ON, the history file will
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be saved after exiting gdb. If set to OFF, the
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file will not be saved. The default is OFF.
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history expansion on/off: If this value is set to ON, then csh-like
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history expansion will be performed on
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command line input. The default is OFF.
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radix N: Sets the default radix for input and output. It can be set
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to 8, 10, or 16. Note that the argument to "radix" is interpreted
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in the current radix, so "set radix 10" is always a no-op.
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height N: This integer value is the number of lines on a page. Default
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is 24, the current `stty rows'' setting, or the ``li#''
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setting from the termcap entry matching the environment
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variable TERM.
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width N: This integer value is the number of characters on a line.
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Default is 80, the current `stty cols'' setting, or the ``co#''
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setting from the termcap entry matching the environment
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variable TERM.
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Note: ``set screensize'' is obsolete. Use ``set height'' and
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``set width'' instead.
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print address on/off: Print memory addresses in various command displays,
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such as stack traces and structure values. Gdb looks
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more ``symbolic'' if you turn this off; it looks more
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``machine level'' with it on. Default is ON.
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print array on/off: Prettyprint arrays. New convenient format! Default
|
|
is OFF.
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|
|
|
print demangle on/off: Print C++ symbols in "source" form if on,
|
|
"raw" form if off.
|
|
|
|
print asm-demangle on/off: Same, for assembler level printouts
|
|
like instructions.
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|
|
|
print vtbl on/off: Prettyprint C++ virtual function tables. Default is OFF.
|
|
|
|
|
|
* Support for Epoch Environment.
|
|
|
|
The epoch environment is a version of Emacs v18 with windowing. One
|
|
new command, ``inspect'', is identical to ``print'', except that if you
|
|
are running in the epoch environment, the value is printed in its own
|
|
window.
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|
|
|
|
|
* Support for Shared Libraries
|
|
|
|
GDB can now debug programs and core files that use SunOS shared libraries.
|
|
Symbols from a shared library cannot be referenced
|
|
before the shared library has been linked with the program (this
|
|
happens after you type ``run'' and before the function main() is entered).
|
|
At any time after this linking (including when examining core files
|
|
from dynamically linked programs), gdb reads the symbols from each
|
|
shared library when you type the ``sharedlibrary'' command.
|
|
It can be abbreviated ``share''.
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|
|
|
sharedlibrary REGEXP: Load shared object library symbols for files
|
|
matching a unix regular expression. No argument
|
|
indicates to load symbols for all shared libraries.
|
|
|
|
info sharedlibrary: Status of loaded shared libraries.
|
|
|
|
|
|
* Watchpoints
|
|
|
|
A watchpoint stops execution of a program whenever the value of an
|
|
expression changes. Checking for this slows down execution
|
|
tremendously whenever you are in the scope of the expression, but is
|
|
quite useful for catching tough ``bit-spreader'' or pointer misuse
|
|
problems. Some machines such as the 386 have hardware for doing this
|
|
more quickly, and future versions of gdb will use this hardware.
|
|
|
|
watch EXP: Set a watchpoint (breakpoint) for an expression.
|
|
|
|
info watchpoints: Information about your watchpoints.
|
|
|
|
delete N: Deletes watchpoint number N (same as breakpoints).
|
|
disable N: Temporarily turns off watchpoint number N (same as breakpoints).
|
|
enable N: Re-enables watchpoint number N (same as breakpoints).
|
|
|
|
|
|
* C++ multiple inheritance
|
|
|
|
When used with a GCC version 2 compiler, GDB supports multiple inheritance
|
|
for C++ programs.
|
|
|
|
* C++ exception handling
|
|
|
|
Gdb now supports limited C++ exception handling. Besides the existing
|
|
ability to breakpoint on an exception handler, gdb can breakpoint on
|
|
the raising of an exception (before the stack is peeled back to the
|
|
handler's context).
|
|
|
|
catch FOO: If there is a FOO exception handler in the dynamic scope,
|
|
set a breakpoint to catch exceptions which may be raised there.
|
|
Multiple exceptions (``catch foo bar baz'') may be caught.
|
|
|
|
info catch: Lists all exceptions which may be caught in the
|
|
current stack frame.
|
|
|
|
|
|
* Minor command changes
|
|
|
|
The command ``call func (arg, arg, ...)'' now acts like the print
|
|
command, except it does not print or save a value if the function's result
|
|
is void. This is similar to dbx usage.
|
|
|
|
The ``up'' and ``down'' commands now always print the frame they end up
|
|
at; ``up-silently'' and `down-silently'' can be used in scripts to change
|
|
frames without printing.
|
|
|
|
* New directory command
|
|
|
|
'dir' now adds directories to the FRONT of the source search path.
|
|
The path starts off empty. Source files that contain debug information
|
|
about the directory in which they were compiled can be found even
|
|
with an empty path; Sun CC and GCC include this information. If GDB can't
|
|
find your source file in the current directory, type "dir .".
|
|
|
|
* Configuring GDB for compilation
|
|
|
|
For normal use, type ``./configure host''. See README or gdb.texinfo
|
|
for more details.
|
|
|
|
GDB now handles cross debugging. If you are remotely debugging between
|
|
two different machines, type ``./configure host -target=targ''.
|
|
Host is the machine where GDB will run; targ is the machine
|
|
where the program that you are debugging will run.
|