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-
- Suggested projects for aspiring or current GDB hackers
- ======================================================
-
- (You should probably chat with kingdon@ai.mit.edu to make sure that
- no one else is doing the project you chose).
-
- Add watchpoints (break if a memory location changes). This would
- usually have to involve constant single stepping, but occasionally
- there is operating system support which gdb should be able to cleanly
- use (e.g. on the 80386, there are 4 debug registers. By ptracing an
- address into them, you can get a trap on writes or on reads and
- writes).
-
- Rewrite proceed, wait_for_inferior, and normal_stop to clean them up.
- Suggestions:
-
- 1) Make each test in wait_for_inferior a seperate subroutine
- call.
- 2) Combine wait_for_inferior and normal_stop to clean up
- communication via global variables.
- 3) See if you can find some way to clean up the global
- variables that are used; possibly group them by data flow
- and information content?
-
- Work out some kind of way to allow running the inferior to be done as
- a sub-execution of, eg. breakpoint command lists. Currently running
- the inferior interupts any command list execution. This would require
- some rewriting of wait_for_inferior & friends, and hence should
- probably be done in concert with the above.
-
- Add function arguments to gdb user defined functions.
-
- Add convenience variables that refer to exec file, symbol file,
- selected frame source file, selected frame function, selected frame
- line number, etc.
-
- Add a "suspend" subcommand of the "continue" command to suspend gdb
- while continuing execution of the subprocess. Useful when you are
- debugging servers and you want to dodge out and initiate a connection
- to a server running under gdb.
-
- Make "handle" understand symbolic signal names.
-
- Work out and implement a reasonably general mechanism for multi-threaded
- processies. There are parts of one implemented in convex-dep.c, if
- you want an example.
-
- A standalone version of gdb on the i386 exists. Anyone who wants to
- do some serious working cleaning it up and making it a general
- standalone gdb should contact pace@wheaties.ai.mit.edu.
-
- Add stab information to allow reasonable debugging of inline functions
- (possibly they should show up on a stack backtrace? With a note
- indicating that they weren't "real"?).
-
- Implement support for specifying arbitrary locations of stack frames
- (in practice, this usually requires specification of both the top and
- bottom of the stack frame (fp and sp), since you *must* retrieve the
- pc that was saved in the innermost frame).
-
- Modify the naked "until" command to step until past the current source
- line, rather than past the current pc value. This is tricky simply
- because the low level routines have no way of specifying a multi-line
- step range, and there is no way of saying "don't print stuff when we
- stop" from above (otherwise could just call step many times).
-
- Modify the handling of symbols grouped through BINCL/EINCL stabs to
- allocate a partial symtab for each BINCL/EINCL grouping. This will
- seriously decrease the size of inter-psymtab dependencies and hence
- lessen the amount that needs to be read in when a new source file is
- accessed.
-
- Work out some method of saving breakpoints across the reloading of an
- executable. Probably this should be by saving the commands by which
- the breakpoints were set and re-executing them (as text locations may
- change).
-
- Do an "x/i $pc" after each stepi or nexti.
-
- Modify all of the disassemblers to use printf_filtered to get correct
- more filtering.
-
- Modify gdb to work correctly with Pascal.
-
- Rewrite macros that handle frame chaining and frameless functions.
- They should be able to tell the difference between start, main, and a
- frameless function called from main.
-
- Work out what information would need to be included in an executable
- by the compiler to allow gdb to debug functions which do not have a
- frame pointer. Modify gdb and gcc to do this.
-
- When `attached' to a program (via either OS support or remote
- debugging), gdb should arrange to catch signals which the terminal
- might send, as it is unlikely that the program will be able to notice
- them. SIGINT and SIGTSTP are obvious examples.
-
- Enhance the gdb manual with extra examples where needed.
-
- Arrange for list_command not to use decode_line_1 and thus not require
- symbols to be read in simply to read a source file.
-
- Problem in xgdb; the readline library needs the terminal in CBREAK
- mode for command line editing, but this makes it difficult to dispatch
- on button presses. Possible solution: use a define to replace getc in
- readline.c with a routine that does button dispatches. You should
- probably see XGDB-README before you fiddle with XGDB. Also, someone
- is implementing a new xgdb; it may not be worth while fiddling with
- the old one.
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