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" Debugger plugin using gdb.
"
" WORK IN PROGRESS - much doesn't work yet
"
" Open two visible terminal windows:
" 1. run a pty, as with ":term NONE"
" 2. run gdb, passing the pty
" The current window is used to view source code and follows gdb.
"
" A third terminal window is hidden, it is used for communication with gdb.
"
" The communication with gdb uses GDB/MI. See:
" https://sourceware.org/gdb/current/onlinedocs/gdb/GDB_002fMI.html
"
" Author: Bram Moolenaar
" Copyright: Vim license applies, see ":help license"
" In case this gets loaded twice.
if exists(':Termdebug')
finish
endif
" Uncomment this line to write logging in "debuglog".
" call ch_logfile('debuglog', 'w')
" The command that starts debugging, e.g. ":Termdebug vim".
" To end type "quit" in the gdb window.
command -nargs=* -complete=file -bang Termdebug call s:StartDebug(<bang>0, <f-args>)
command -nargs=+ -complete=file -bang TermdebugCommand call s:StartDebugCommand(<bang>0, <f-args>)
" Name of the gdb command, defaults to "gdb".
if !exists('termdebugger')
let termdebugger = 'gdb'
endif
let s:pc_id = 12
let s:break_id = 13
let s:stopped = 1
if &background == 'light'
hi default debugPC term=reverse ctermbg=lightblue guibg=lightblue
else
hi default debugPC term=reverse ctermbg=darkblue guibg=darkblue
endif
hi default debugBreakpoint term=reverse ctermbg=red guibg=red
func s:StartDebug(bang, ...)
" First argument is the command to debug, second core file or process ID.
call s:StartDebug_internal({'gdb_args': a:000, 'bang': a:bang})
endfunc
func s:StartDebugCommand(bang, ...)
" First argument is the command to debug, rest are run arguments.
call s:StartDebug_internal({'gdb_args': [a:1], 'proc_args': a:000[1:], 'bang': a:bang})
endfunc
func s:StartDebug_internal(dict)
if exists('s:gdbwin')
echoerr 'Terminal debugger already running'
return
endif
let s:startwin = win_getid(winnr())
let s:startsigncolumn = &signcolumn
let s:save_columns = 0
if exists('g:termdebug_wide')
if &columns < g:termdebug_wide
let s:save_columns = &columns
let &columns = g:termdebug_wide
endif
let vertical = 1
else
let vertical = 0
endif
" Open a terminal window without a job, to run the debugged program
let s:ptybuf = term_start('NONE', {
\ 'term_name': 'gdb program',
\ 'vertical': vertical,
\ })
if s:ptybuf == 0
echoerr 'Failed to open the program terminal window'
return
endif
let pty = job_info(term_getjob(s:ptybuf))['tty_out']
let s:ptywin = win_getid(winnr())
if vertical
" Assuming the source code window will get a signcolumn, use two more
" columns for that, thus one less for the terminal window.
exe (&columns / 2 - 1) . "wincmd |"
endif
" Create a hidden terminal window to communicate with gdb
let s:commbuf = term_start('NONE', {
\ 'term_name': 'gdb communication',
\ 'out_cb': function('s:CommOutput'),
\ 'hidden': 1,
\ })
if s:commbuf == 0
echoerr 'Failed to open the communication terminal window'
exe 'bwipe! ' . s:ptybuf
return
endif
let commpty = job_info(term_getjob(s:commbuf))['tty_out']
" Open a terminal window to run the debugger.
" Add -quiet to avoid the intro message causing a hit-enter prompt.
let gdb_args = get(a:dict, 'gdb_args', [])
let proc_args = get(a:dict, 'proc_args', [])
let cmd = [g:termdebugger, '-quiet', '-tty', pty] + gdb_args
echomsg 'executing "' . join(cmd) . '"'
let s:gdbbuf = term_start(cmd, {
\ 'exit_cb': function('s:EndDebug'),
\ 'term_finish': 'close',
\ })
if s:gdbbuf == 0
echoerr 'Failed to open the gdb terminal window'
exe 'bwipe! ' . s:ptybuf
exe 'bwipe! ' . s:commbuf
return
endif
let s:gdbwin = win_getid(winnr())
" Set arguments to be run
if len(proc_args)
call term_sendkeys(s:gdbbuf, 'set args ' . join(proc_args) . "\r")
endif
" Connect gdb to the communication pty, using the GDB/MI interface
call term_sendkeys(s:gdbbuf, 'new-ui mi ' . commpty . "\r")
" Wait for the response to show up, users may not notice the error and wonder
" why the debugger doesn't work.
let try_count = 0
while 1
let response = ''
for lnum in range(1,200)
if term_getline(s:gdbbuf, lnum) =~ 'new-ui mi '
let response = term_getline(s:gdbbuf, lnum + 1)
if response =~ 'Undefined command'
echoerr 'Sorry, your gdb is too old, gdb 7.12 is required'
exe 'bwipe! ' . s:ptybuf
exe 'bwipe! ' . s:commbuf
return
endif
if response =~ 'New UI allocated'
" Success!
break
endif
endif
endfor
if response =~ 'New UI allocated'
break
endif
let try_count += 1
if try_count > 100
echoerr 'Cannot check if your gdb works, continuing anyway'
break
endif
sleep 10m
endwhile
" Interpret commands while the target is running. This should usualy only be
" exec-interrupt, since many commands don't work properly while the target is
" running.
call s:SendCommand('-gdb-set mi-async on')
" Disable pagination, it causes everything to stop at the gdb
" "Type <return> to continue" prompt.
call s:SendCommand('-gdb-set pagination off')
" Sign used to highlight the line where the program has stopped.
" There can be only one.
sign define debugPC linehl=debugPC
" Sign used to indicate a breakpoint.
" Can be used multiple times.
sign define debugBreakpoint text=>> texthl=debugBreakpoint
" Install debugger commands in the text window.
call win_gotoid(s:startwin)
call s:InstallCommands()
call win_gotoid(s:gdbwin)
" Enable showing a balloon with eval info
if has("balloon_eval") || has("balloon_eval_term")
set balloonexpr=TermDebugBalloonExpr()
if has("balloon_eval")
set ballooneval
endif
if has("balloon_eval_term")
set balloonevalterm
endif
endif
let s:breakpoints = {}
augroup TermDebug
au BufRead * call s:BufRead()
au BufUnload * call s:BufUnloaded()
augroup END
" Run the command if the bang attribute was given
" and got to the window
if get(a:dict, 'bang', 0)
call s:SendCommand('-exec-run')
call win_gotoid(s:ptywin)
endif
endfunc
func s:EndDebug(job, status)
exe 'bwipe! ' . s:ptybuf
exe 'bwipe! ' . s:commbuf
unlet s:gdbwin
let curwinid = win_getid(winnr())
call win_gotoid(s:startwin)
let &signcolumn = s:startsigncolumn
call s:DeleteCommands()
call win_gotoid(curwinid)
if s:save_columns > 0
let &columns = s:save_columns
endif
if has("balloon_eval") || has("balloon_eval_term")
set balloonexpr=
if has("balloon_eval")
set noballooneval
endif
if has("balloon_eval_term")
set noballoonevalterm
endif
endif
au! TermDebug
endfunc
" Handle a message received from gdb on the GDB/MI interface.
func s:CommOutput(chan, msg)
let msgs = split(a:msg, "\r")
for msg in msgs
" remove prefixed NL
if msg[0] == "\n"
let msg = msg[1:]
endif
if msg != ''
if msg =~ '^\(\*stopped\|\*running\|=thread-selected\)'
call s:HandleCursor(msg)
elseif msg =~ '^\^done,bkpt=' || msg =~ '^=breakpoint-created,'
call s:HandleNewBreakpoint(msg)
elseif msg =~ '^=breakpoint-deleted,'
call s:HandleBreakpointDelete(msg)
elseif msg =~ '^\^done,value='
call s:HandleEvaluate(msg)
elseif msg =~ '^\^error,msg='
call s:HandleError(msg)
endif
endif
endfor
endfunc
" Install commands in the current window to control the debugger.
func s:InstallCommands()
command Break call s:SetBreakpoint()
command Clear call s:ClearBreakpoint()
command Step call s:SendCommand('-exec-step')
command Over call s:SendCommand('-exec-next')
command Finish call s:SendCommand('-exec-finish')
command -nargs=* Run call s:Run(<q-args>)
command -nargs=* Arguments call s:SendCommand('-exec-arguments ' . <q-args>)
command Stop call s:SendCommand('-exec-interrupt')
command Continue call s:SendCommand('-exec-continue')
command -range -nargs=* Evaluate call s:Evaluate(<range>, <q-args>)
command Gdb call win_gotoid(s:gdbwin)
command Program call win_gotoid(s:ptywin)
command Source call s:GotoStartwinOrCreateIt()
command Winbar call s:InstallWinbar()
" TODO: can the K mapping be restored?
nnoremap K :Evaluate<CR>
if has('menu') && &mouse != ''
call s:InstallWinbar()
if !exists('g:termdebug_popup') || g:termdebug_popup != 0
let s:saved_mousemodel = &mousemodel
let &mousemodel = 'popup_setpos'
an 1.200 PopUp.-SEP3- <Nop>
an 1.210 PopUp.Set\ breakpoint :Break<CR>
an 1.220 PopUp.Clear\ breakpoint :Clear<CR>
an 1.230 PopUp.Evaluate :Evaluate<CR>
endif
endif
endfunc
let s:winbar_winids = []
" Install the window toolbar in the current window.
func s:InstallWinbar()
if has('menu') && &mouse != ''
nnoremenu WinBar.Step :Step<CR>
nnoremenu WinBar.Next :Over<CR>
nnoremenu WinBar.Finish :Finish<CR>
nnoremenu WinBar.Cont :Continue<CR>
nnoremenu WinBar.Stop :Stop<CR>
nnoremenu WinBar.Eval :Evaluate<CR>
call add(s:winbar_winids, win_getid(winnr()))
endif
endfunc
" Delete installed debugger commands in the current window.
func s:DeleteCommands()
delcommand Break
delcommand Clear
delcommand Step
delcommand Over
delcommand Finish
delcommand Run
delcommand Arguments
delcommand Stop
delcommand Continue
delcommand Evaluate
delcommand Gdb
delcommand Program
delcommand Source
delcommand Winbar
nunmap K
if has('menu')
" Remove the WinBar entries from all windows where it was added.
let curwinid = win_getid(winnr())
for winid in s:winbar_winids
if win_gotoid(winid)
aunmenu WinBar.Step
aunmenu WinBar.Next
aunmenu WinBar.Finish
aunmenu WinBar.Cont
aunmenu WinBar.Stop
aunmenu WinBar.Eval
endif
endfor
call win_gotoid(curwinid)
let s:winbar_winids = []
if exists('s:saved_mousemodel')
let &mousemodel = s:saved_mousemodel
unlet s:saved_mousemodel
aunmenu PopUp.-SEP3-
aunmenu PopUp.Set\ breakpoint
aunmenu PopUp.Clear\ breakpoint
aunmenu PopUp.Evaluate
endif
endif
exe 'sign unplace ' . s:pc_id
for key in keys(s:breakpoints)
exe 'sign unplace ' . (s:break_id + key)
endfor
sign undefine debugPC
sign undefine debugBreakpoint
unlet s:breakpoints
endfunc
" :Break - Set a breakpoint at the cursor position.
func s:SetBreakpoint()
" Setting a breakpoint may not work while the program is running.
" Interrupt to make it work.
let do_continue = 0
if !s:stopped
let do_continue = 1
call s:SendCommand('-exec-interrupt')
sleep 10m
endif
call s:SendCommand('-break-insert --source '
\ . fnameescape(expand('%:p')) . ' --line ' . line('.'))
if do_continue
call s:SendCommand('-exec-continue')
endif
endfunc
" :Clear - Delete a breakpoint at the cursor position.
func s:ClearBreakpoint()
let fname = fnameescape(expand('%:p'))
let lnum = line('.')
for [key, val] in items(s:breakpoints)
if val['fname'] == fname && val['lnum'] == lnum
call term_sendkeys(s:commbuf, '-break-delete ' . key . "\r")
" Assume this always wors, the reply is simply "^done".
exe 'sign unplace ' . (s:break_id + key)
unlet s:breakpoints[key]
break
endif
endfor
endfunc
" :Next, :Continue, etc - send a command to gdb
func s:SendCommand(cmd)
call term_sendkeys(s:commbuf, a:cmd . "\r")
endfunc
func s:Run(args)
if a:args != ''
call s:SendCommand('-exec-arguments ' . a:args)
endif
call s:SendCommand('-exec-run')
endfunc
func s:SendEval(expr)
call s:SendCommand('-data-evaluate-expression "' . a:expr . '"')
let s:evalexpr = a:expr
endfunc
" :Evaluate - evaluate what is under the cursor
func s:Evaluate(range, arg)
if a:arg != ''
let expr = a:arg
elseif a:range == 2
let pos = getcurpos()
let reg = getreg('v', 1, 1)
let regt = getregtype('v')
normal! gv"vy
let expr = @v
call setpos('.', pos)
call setreg('v', reg, regt)
else
let expr = expand('<cexpr>')
endif
let s:ignoreEvalError = 0
call s:SendEval(expr)
endfunc
let s:ignoreEvalError = 0
let s:evalFromBalloonExpr = 0
" Handle the result of data-evaluate-expression
func s:HandleEvaluate(msg)
let value = substitute(a:msg, '.*value="\(.*\)"', '\1', '')
let value = substitute(value, '\\"', '"', 'g')
if s:evalFromBalloonExpr
if s:evalFromBalloonExprResult == ''
let s:evalFromBalloonExprResult = s:evalexpr . ': ' . value
else
let s:evalFromBalloonExprResult .= ' = ' . value
endif
call balloon_show(s:evalFromBalloonExprResult)
else
echomsg '"' . s:evalexpr . '": ' . value
endif
if s:evalexpr[0] != '*' && value =~ '^0x' && value != '0x0' && value !~ '"$'
" Looks like a pointer, also display what it points to.
let s:ignoreEvalError = 1
call s:SendEval('*' . s:evalexpr)
else
let s:evalFromBalloonExpr = 0
endif
endfunc
" Show a balloon with information of the variable under the mouse pointer,
" if there is any.
func TermDebugBalloonExpr()
if v:beval_winid != s:startwin
return
endif
let s:evalFromBalloonExpr = 1
let s:evalFromBalloonExprResult = ''
let s:ignoreEvalError = 1
call s:SendEval(v:beval_text)
return ''
endfunc
" Handle an error.
func s:HandleError(msg)
if s:ignoreEvalError
" Result of s:SendEval() failed, ignore.
let s:ignoreEvalError = 0
let s:evalFromBalloonExpr = 0
return
endif
echoerr substitute(a:msg, '.*msg="\(.*\)"', '\1', '')
endfunc
func s:GotoStartwinOrCreateIt()
if !win_gotoid(s:startwin)
new
let s:startwin = win_getid(winnr())
call s:InstallWinbar()
endif
endfunc
" Handle stopping and running message from gdb.
" Will update the sign that shows the current position.
func s:HandleCursor(msg)
let wid = win_getid(winnr())
if a:msg =~ '^\*stopped'
let s:stopped = 1
elseif a:msg =~ '^\*running'
let s:stopped = 0
endif
call s:GotoStartwinOrCreateIt()
let fname = substitute(a:msg, '.*fullname="\([^"]*\)".*', '\1', '')
if a:msg =~ '^\(\*stopped\|=thread-selected\)' && filereadable(fname)
let lnum = substitute(a:msg, '.*line="\([^"]*\)".*', '\1', '')
if lnum =~ '^[0-9]*$'
if expand('%:p') != fnamemodify(fname, ':p')
if &modified
" TODO: find existing window
exe 'split ' . fnameescape(fname)
let s:startwin = win_getid(winnr())
call s:InstallWinbar()
else
exe 'edit ' . fnameescape(fname)
endif
endif
exe lnum
exe 'sign unplace ' . s:pc_id
exe 'sign place ' . s:pc_id . ' line=' . lnum . ' name=debugPC file=' . fname
setlocal signcolumn=yes
endif
else
exe 'sign unplace ' . s:pc_id
endif
call win_gotoid(wid)
endfunc
" Handle setting a breakpoint
" Will update the sign that shows the breakpoint
func s:HandleNewBreakpoint(msg)
let nr = substitute(a:msg, '.*number="\([0-9]\)*\".*', '\1', '') + 0
if nr == 0
return
endif
if has_key(s:breakpoints, nr)
let entry = s:breakpoints[nr]
else
let entry = {}
let s:breakpoints[nr] = entry
endif
let fname = substitute(a:msg, '.*fullname="\([^"]*\)".*', '\1', '')
let lnum = substitute(a:msg, '.*line="\([^"]*\)".*', '\1', '')
let entry['fname'] = fname
let entry['lnum'] = lnum
if bufloaded(fname)
call s:PlaceSign(nr, entry)
endif
endfunc
func s:PlaceSign(nr, entry)
exe 'sign place ' . (s:break_id + a:nr) . ' line=' . a:entry['lnum'] . ' name=debugBreakpoint file=' . a:entry['fname']
let a:entry['placed'] = 1
endfunc
" Handle deleting a breakpoint
" Will remove the sign that shows the breakpoint
func s:HandleBreakpointDelete(msg)
let nr = substitute(a:msg, '.*id="\([0-9]*\)\".*', '\1', '') + 0
if nr == 0
return
endif
if has_key(s:breakpoints, nr)
let entry = s:breakpoints[nr]
if has_key(entry, 'placed')
exe 'sign unplace ' . (s:break_id + nr)
unlet entry['placed']
endif
unlet s:breakpoints[nr]
endif
endfunc
" Handle a BufRead autocommand event: place any signs.
func s:BufRead()
let fname = expand('<afile>:p')
for [nr, entry] in items(s:breakpoints)
if entry['fname'] == fname
call s:PlaceSign(nr, entry)
endif
endfor
endfunc
" Handle a BufUnloaded autocommand event: unplace any signs.
func s:BufUnloaded()
let fname = expand('<afile>:p')
for [nr, entry] in items(s:breakpoints)
if entry['fname'] == fname
let entry['placed'] = 0
endif
endfor
endfunc