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-- Created by Dave Nichols. Taken from: http://luaforge.net/projects/clidebugger/
--{{{ history
--15/03/06 DCN Created based on RemDebug
--28/04/06 DCN Update for Lua 5.1
--01/06/06 DCN Fix command argument parsing
-- Add step/over N facility
-- Add trace lines facility
--05/06/06 DCN Add trace call/return facility
--06/06/06 DCN Make it behave when stepping through the creation of a coroutine
--06/06/06 DCN Integrate the simple debugger into the main one
--07/06/06 DCN Provide facility to step into coroutines
--13/06/06 DCN Fix bug that caused the function environment to get corrupted with the global one
--14/06/06 DCN Allow 'sloppy' file names when setting breakpoints
--04/08/06 DCN Allow for no space after command name
--11/08/06 DCN Use io.write not print
--30/08/06 DCN Allow access to array elements in 'dump'
--10/10/06 DCN Default to breakfile for all commands that require a filename and give '-'
--06/12/06 DCN Allow for punctuation characters in DUMP variable names
--03/01/07 DCN Add pause on/off facility
--19/06/07 DCN Allow for duff commands being typed in the debugger (thanks to Michael.Bringmann@lsi.com)
-- Allow for case sensitive file systems (thanks to Michael.Bringmann@lsi.com)
--}}}
--{{{ description
--A simple command line debug system for Lua written by Dave Nichols of
--Match-IT Limited. Its public domain software. Do with it as you wish.
--This debugger was inspired by:
-- RemDebug 1.0 Beta
-- Copyright Kepler Project 2005 (http://www.keplerproject.org/remdebug)
--Usage:
-- require('debugger') --load the debug library
-- pause(message) --start/resume a debug session
--An assert() failure will also invoke the debugger.
--}}}
local IsWindows = string.find(string.lower(os.getenv('OS') or ''),'^windows')
local coro_debugger
local events = { BREAK = 1, WATCH = 2, STEP = 3, SET = 4 }
local breakpoints = {}
local watches = {}
local step_into = false
local step_over = false
local step_lines = 0
local step_level = {main=0}
local stack_level = {main=0}
local trace_level = {main=0}
local trace_calls = false
local trace_returns = false
local trace_lines = false
local ret_file, ret_line, ret_name
local current_thread = 'main'
local started = false
local pause_off = false
local _g = _G
local cocreate, cowrap = coroutine.create, coroutine.wrap
local pausemsg = 'pause'
local prompt = "[debug]> "
-- Unix readline support, if readline.so is available...
local rl,readline,saveline
err = pcall(function()
rl = require 'devtools.readline'
readline = rl.readline
saveline = rl.add_history
end)
if not rl then
readline = function(prompt)
write(prompt)
return read()
end
saveline = function(s) end
end
--{{{ local hints -- command help
--The format in here is name=summary|description
local hints = {
pause = [[
pause(msg) -- start/resume a debugger session|
This can only be used in your code or from the console as a means to
start/resume a debug session.
If msg is given that is shown when the session starts/resumes. Useful to
give a context if you've instrumented your code with pause() statements.
]],
poff = [[
poff -- turn off pause() command|
This causes all pause() commands to be ignored. This is useful if you have
instrumented your code in a busy loop and want to continue normal execution
with no further interruption.
]],
pon = [[
pon -- turn on pause() command|
This re-instates honouring the pause() commands you may have instrumented
your code with.
]],
setb = [[
setb [line file] -- set a breakpoint to line/file|
If file is omitted or is "-" the breakpoint is set at the file for the
currently set level (see "set"). Execution pauses when this line is about
to be executed and the debugger session is re-activated.
The file can be given as the fully qualified name, partially qualified or
just the file name. E.g. if file is set as "myfile.lua", then whenever
execution reaches any file that ends with "myfile.lua" it will pause.
]],
delb = [[
delb [line file] -- removes a breakpoint|
If file is omitted or is "-" the breakpoint is removed for the file of the
currently set level (see "set").
]],
delallb = [[
delallb -- removes all breakpoints|
]],
setw = [[
setw <exp> -- adds a new watch expression|
The expression is evaluated before each line is executed. If the expression
yields true then execution is paused and the debugger session re-activated.
The expression is executed in the context of the line about to be executed.
]],
delw = [[
delw <index> -- removes the watch expression at index|
The index is that returned when the watch expression was set by setw.
]],
delallw = [[
delallw -- removes all watch expressions|
]],
run = [[
run -- run until next breakpoint or watch expression|
]],
step = [[
step [N] -- run next N lines, stepping into function calls|
If N is omitted, use 1.
]],
over = [[
over [N] -- run next N lines, stepping over function calls|
If N is omitted, use 1.
]],
out = [[
out [N] -- run lines until stepped out of N functions|
If N is omitted, use 1.
If you are inside a function, using "out 1" will run until you return
from that function to the caller.
]],
goto = [[
goto <line> -- step to line number <line> in the current file|
The line and current file are those in the currently set context level.
]],
listb = [[
listb -- lists breakpoints|
]],
listw = [[
listw -- lists watch expressions|
]],
set = [[
set [level] -- set context to stack level, omitted=show|
If level is omitted it just prints the current level set.
This sets the current context to the level given. This affects the
context used for several other functions (e.g. vars). The possible
levels are those shown by trace.
]],
vars = [[
vars [depth] -- list context locals to depth, omitted=1|
If depth is omitted then uses 1.
Use a depth of 0 for the maximum.
Lists all non-nil local variables and all non-nil upvalues in the
currently set context. For variables that are tables, lists all fields
to the given depth.
]],
fenv = [[
fenv [depth] -- list context function env to depth, omitted=1|
If depth is omitted then uses 1.
Use a depth of 0 for the maximum.
Lists all function environment variables in the currently set context.
For variables that are tables, lists all fields to the given depth.
]],
glob = [[
glob [depth] -- list globals to depth, omitted=1|
If depth is omitted then uses 1.
Use a depth of 0 for the maximum.
Lists all global variables.
For variables that are tables, lists all fields to the given depth.
]],
ups = [[
ups -- list all the upvalue names|
These names will also be in the "vars" list unless their value is nil.
This provides a means to identify which vars are upvalues and which are
locals. If a name is both an upvalue and a local, the local value takes
precedance.
]],
locs = [[
locs -- list all the locals names|
These names will also be in the "vars" list unless their value is nil.
This provides a means to identify which vars are upvalues and which are
locals. If a name is both an upvalue and a local, the local value takes
precedance.
]],
dump = [[
dump <var> [depth] -- dump all fields of variable to depth|
If depth is omitted then uses 1.
Use a depth of 0 for the maximum.
Prints the value of <var> in the currently set context level. If <var>
is a table, lists all fields to the given depth. <var> can be just a
name, or name.field or name.# to any depth, e.g. t.1.f accesses field
'f' in array element 1 in table 't'.
Can also be called from a script as dump(var,depth).
]],
tron = [[
tron [crl] -- turn trace on for (c)alls, (r)etuns, (l)lines|
If no parameter is given then tracing is turned off.
When tracing is turned on a line is printed to the console for each
debug 'event' selected. c=function calls, r=function returns, l=lines.
]],
trace = [[
trace -- dumps a stack trace|
Format is [level] = file,line,name
The level is a candidate for use by the 'set' command.
]],
info = [[
info -- dumps the complete debug info captured|
Only useful as a diagnostic aid for the debugger itself. This information
can be HUGE as it dumps all variables to the maximum depth, so be careful.
]],
show = [[
show line file X Y -- show X lines before and Y after line in file|
If line is omitted or is '-' then the current set context line is used.
If file is omitted or is '-' then the current set context file is used.
If file is not fully qualified and cannot be opened as specified, then
a search for the file in the package[path] is performed using the usual
"require" searching rules. If no file extension is given, .lua is used.
Prints the lines from the source file around the given line.
]],
exit = [[
exit -- exits debugger, re-start it using pause()|
]],
help = [[
help [command] -- show this list or help for command|
]],
["<statement>"] = [[
<statement> -- execute a statement in the current context|
The statement can be anything that is legal in the context, including
assignments. Such assignments affect the context and will be in force
immediately. Any results returned are printed. Use '=' as a short-hand
for 'return', e.g. "=func(arg)" will call 'func' with 'arg' and print
the results, and "=var" will just print the value of 'var'.
]],
what = [[
what <func> -- show where <func> is defined (if known)|
]],
}
--}}}
--{{{ local function getinfo(level,field)
--like debug.getinfo but copes with no activation record at the given level
--and knows how to get 'field'. 'field' can be the name of any of the
--activation record fields or any of the 'what' names or nil for everything.
--only valid when using the stack level to get info, not a function name.
local function getinfo(level,field)
level = level + 1 --to get to the same relative level as the caller
if not field then return debug.getinfo(level) end
local what
if field == 'name' or field == 'namewhat' then
what = 'n'
elseif field == 'what' or field == 'source' or field == 'linedefined' or field == 'lastlinedefined' or field == 'short_src' then
what = 'S'
elseif field == 'currentline' then
what = 'l'
elseif field == 'nups' then
what = 'u'
elseif field == 'func' then
what = 'f'
else
return debug.getinfo(level,field)
end
local ar = debug.getinfo(level,what)
if ar then return ar[field] else return nil end
end
--}}}
--{{{ local function indented( level, ... )
local function indented( level, ... )
io.write( string.rep(' ',level), table.concat({...}), '\n' )
end
--}}}
--{{{ local function dumpval( level, name, value, limit )
local dumpvisited
local function dumpval( level, name, value, limit )
local index
if type(name) == 'number' then
index = string.format('[%d] = ',name)
elseif type(name) == 'string'
and (name == '__VARSLEVEL__' or name == '__ENVIRONMENT__' or name == '__GLOBALS__' or name == '__UPVALUES__' or name == '__LOCALS__') then
--ignore these, they are debugger generated
return
elseif type(name) == 'string' and string.find(name,'^[_%a][_.%w]*$') then
index = name ..' = '
else
index = string.format('[%q] = ',tostring(name))
end
if type(value) == 'table' then
if dumpvisited[value] then
indented( level, index, string.format('ref%q;',dumpvisited[value]) )
else
dumpvisited[value] = tostring(value)
if (limit or 0) > 0 and level+1 >= limit then
indented( level, index, dumpvisited[value] )
else
indented( level, index, '{ -- ', dumpvisited[value] )
for n,v in pairs(value) do
dumpval( level+1, n, v, limit )
end
indented( level, '};' )
end
end
else
if type(value) == 'string' then
if string.len(value) > 40 then
indented( level, index, '[[', value, ']];' )
else
indented( level, index, string.format('%q',value), ';' )
end
else
indented( level, index, tostring(value), ';' )
end
end
end
--}}}
--{{{ local function dumpvar( value, limit, name )
local function dumpvar( value, limit, name )
dumpvisited = {}
dumpval( 0, name or tostring(value), value, limit )
end
--}}}
--{{{ local function show(file,line,before,after)
--show +/-N lines of a file around line M
local function show(file,line,before,after)
line = tonumber(line or 1)
before = tonumber(before or 10)
after = tonumber(after or before)
if not string.find(file,'%.') then file = file..'.lua' end
local f = io.open(file,'r')
if not f then
--{{{ try to find the file in the path
--
-- looks for a file in the package path
--
local path = package.path or LUA_PATH or ''
for c in string.gmatch (path, "[^;]+") do
local c = string.gsub (c, "%?%.lua", file)
f = io.open (c,'r')
if f then
break
end
end
--}}}
if not f then
io.write('Cannot find '..file..'\n')
return
end
end
local i = 0
for l in f:lines() do
i = i + 1
if i >= (line-before) then
if i > (line+after) then break end
if i == line then
io.write(i..'***\t'..l..'\n')
else
io.write(i..'\t'..l..'\n')
end
end
end
f:close()
end
--}}}
--{{{ local function tracestack(l)
local function gi( i )
return function() i=i+1 return debug.getinfo(i),i end
end
local function gl( level, j )
return function() j=j+1 return debug.getlocal( level, j ) end
end
local function gu( func, k )
return function() k=k+1 return debug.getupvalue( func, k ) end
end
local traceinfo
local function tracestack(l)
local l = l + 1 --NB: +1 to get level relative to caller
traceinfo = {}
traceinfo.pausemsg = pausemsg
for ar,i in gi(l) do
table.insert( traceinfo, ar )
local names = {}
local values = {}
for n,v in gl(i,0) do
if string.sub(n,1,1) ~= '(' then --ignore internal control variables
table.insert( names, n )
table.insert( values, v )
end
end
if #names > 0 then
ar.lnames = names
ar.lvalues = values
end
if ar.func then
local names = {}
local values = {}
for n,v in gu(ar.func,0) do
if string.sub(n,1,1) ~= '(' then --ignore internal control variables
table.insert( names, n )
table.insert( values, v )
end
end
if #names > 0 then
ar.unames = names
ar.uvalues = values
end
end
end
end
--}}}
--{{{ local function trace()
local function trace(set)
local mark
for level,ar in ipairs(traceinfo) do
if level == set then
mark = '***'
else
mark = ''
end
io.write('['..level..']'..mark..'\t'..(ar.name or ar.what)..' in '..ar.short_src..':'..ar.currentline..'\n')
end
end
--}}}
--{{{ local function info()
local function info() dumpvar( traceinfo, 0, 'traceinfo' ) end
--}}}
--{{{ local function set_breakpoint(file, line)
local function set_breakpoint(file, line)
if not breakpoints[line] then
breakpoints[line] = {}
end
breakpoints[line][file] = true
end
--}}}
--{{{ local function remove_breakpoint(file, line)
local function remove_breakpoint(file, line)
if breakpoints[line] then
breakpoints[line][file] = nil
end
end
--}}}
--{{{ local function has_breakpoint(file, line)
--allow for 'sloppy' file names
--search for file and all variations walking up its directory hierachy
--ditto for the file with no extension
local function has_breakpoint(file, line)
if not breakpoints[line] then return false end
local noext = string.gsub(file,"(%..-)$",'',1)
if noext == file then noext = nil end
while file do
if breakpoints[line][file] then return true end
file = string.match(file,"[:/\](.+)$")
end
while noext do
if breakpoints[line][noext] then return true end
noext = string.match(noext,"[:/\](.+)$")
end
return false
end
--}}}
--{{{ local function capture_vars(ref,level,line)
local function capture_vars(ref,level,line)
--get vars, file and line for the given level relative to debug_hook offset by ref
local lvl = ref + level --NB: This includes an offset of +1 for the call to here
--{{{ capture variables
local ar = debug.getinfo(lvl, "f")
if not ar then return {},'?',0 end
local vars = {__UPVALUES__={}, __LOCALS__={}}
local i
local func = ar.func
if func then
i = 1
while true do
local name, value = debug.getupvalue(func, i)
if not name then break end
if string.sub(name,1,1) ~= '(' then --NB: ignoring internal control variables
vars[name] = value
vars.__UPVALUES__[i] = name
end
i = i + 1
end
vars.__ENVIRONMENT__ = getfenv(func)
end
vars.__GLOBALS__ = getfenv(0)
i = 1
while true do
local name, value = debug.getlocal(lvl, i)
if not name then break end
if string.sub(name,1,1) ~= '(' then --NB: ignoring internal control variables
vars[name] = value
vars.__LOCALS__[i] = name
end
i = i + 1
end
vars.__VARSLEVEL__ = level
if func then
--NB: Do not do this until finished filling the vars table
setmetatable(vars, { __index = getfenv(func), __newindex = getfenv(func) })
end
--NB: Do not read or write the vars table anymore else the metatable functions will get invoked!
--}}}
local file = getinfo(lvl, "source")
if string.find(file, "@") == 1 then
file = string.sub(file, 2)
end
if IsWindows then file = string.lower(file) end
if not line then
line = getinfo(lvl, "currentline")
end
return vars,file,line
end
--}}}
--{{{ local function restore_vars(ref,vars)
local function restore_vars(ref,vars)
if type(vars) ~= 'table' then return end
local level = vars.__VARSLEVEL__ --NB: This level is relative to debug_hook offset by ref
if not level then return end
level = level + ref --NB: This includes an offset of +1 for the call to here
local i
local written_vars = {}
i = 1
while true do
local name, value = debug.getlocal(level, i)
if not name then break end
if vars[name] and string.sub(name,1,1) ~= '(' then --NB: ignoring internal control variables
debug.setlocal(level, i, vars[name])
written_vars[name] = true
end
i = i + 1
end
local ar = debug.getinfo(level, "f")
if not ar then return end
local func = ar.func
if func then
i = 1
while true do
local name, value = debug.getupvalue(func, i)
if not name then break end
if vars[name] and string.sub(name,1,1) ~= '(' then --NB: ignoring internal control variables
if not written_vars[name] then
debug.setupvalue(func, i, vars[name])
end
written_vars[name] = true
end
i = i + 1
end
end
end
--}}}
--{{{ local function trace_event(event, line, level)
local function print_trace(level,depth,event,file,line,name)
--NB: level here is relative to the caller of trace_event, so offset by 2 to get to there
level = level + 2
local file = file or getinfo(level,'short_src')
local line = line or getinfo(level,'currentline')
local name = name or getinfo(level,'name')
local prefix = ''
if current_thread ~= 'main' then prefix = '['..tostring(current_thread)..'] ' end
io.write(prefix..
string.format('%08.2f:%02i.',os.clock(),depth)..
string.rep('.',depth%32)..
(file or '')..' ('..(line or '')..') '..
(name or '')..
' ('..event..')\n')
end
local function trace_event(event, line, level)
if event == 'return' and trace_returns then
--note the line info for later
ret_file = getinfo(level+1,'short_src')
ret_line = getinfo(level+1,'currentline')
ret_name = getinfo(level+1,'name')
end
if event ~= 'line' then return end
local slevel = stack_level[current_thread]
local tlevel = trace_level[current_thread]
if trace_calls and slevel > tlevel then
--we are now in the function called, so look back 1 level further to find the calling file and line
print_trace(level+1,slevel-1,'c',nil,nil,getinfo(level+1,'name'))
end
if trace_returns and slevel < tlevel then
print_trace(level,slevel,'r',ret_file,ret_line,ret_name)
end
if trace_lines then
print_trace(level,slevel,'l')
end
trace_level[current_thread] = stack_level[current_thread]
end
--}}}
--{{{ local function debug_hook(event, line, level, thread)
local function debug_hook(event, line, level, thread)
if not started then debug.sethook() return end
current_thread = thread or 'main'
local level = level or 2
trace_event(event,line,level)
if event == "call" then
stack_level[current_thread] = stack_level[current_thread] + 1
elseif event == "return" then
stack_level[current_thread] = stack_level[current_thread] - 1
if stack_level[current_thread] < 0 then stack_level[current_thread] = 0 end
else
local vars,file,line = capture_vars(level,1,line)
local stop, ev, idx = false, events.STEP, 0
while true do
for index, value in pairs(watches) do
setfenv(value.func, vars)
local status, res = pcall(value.func)
if status and res then
ev, idx = events.WATCH, index
stop = true
break
end
end
if stop then break end
if (step_into)
or (step_over and (stack_level[current_thread] <= step_level[current_thread] or stack_level[current_thread] == 0)) then
step_lines = step_lines - 1
if step_lines < 1 then
ev, idx = events.STEP, 0
break
end
end
if has_breakpoint(file, line) then
ev, idx = events.BREAK, 0
break
end
return
end
tracestack(level)
local last_next = 1
local err, next = assert(coroutine.resume(coro_debugger, ev, vars, file, line, idx))
while true do
if next == 'cont' then
return
elseif next == 'stop' then
started = false
debug.sethook()
return
elseif tonumber(next) then --get vars for given level or last level
next = tonumber(next)
if next == 0 then next = last_next end
last_next = next
restore_vars(level,vars)
vars, file, line = capture_vars(level,next)
err, next = assert(coroutine.resume(coro_debugger, events.SET, vars, file, line, idx))
else
io.write('Unknown command from debugger_loop: '..tostring(next)..'\n')
io.write('Stopping debugger\n')
next = 'stop'
end
end
end
end
--}}}
--{{{ local function report(ev, vars, file, line, idx_watch)
local function report(ev, vars, file, line, idx_watch)
local vars = vars or {}
local file = file or '?'
local line = line or 0
local prefix = ''
if current_thread ~= 'main' then prefix = '['..tostring(current_thread)..'] ' end
if ev == events.STEP then
io.write(prefix.."Paused at file "..file.." line "..line..' ('..stack_level[current_thread]..')\n')
elseif ev == events.BREAK then
io.write(prefix.."Paused at file "..file.." line "..line..' ('..stack_level[current_thread]..') (breakpoint)\n')
elseif ev == events.WATCH then
io.write(prefix.."Paused at file "..file.." line "..line..' ('..stack_level[current_thread]..')'.." (watch expression "..idx_watch.. ": ["..watches[idx_watch].exp.."])\n")
elseif ev == events.SET then
--do nothing
else
io.write(prefix.."Error in application: "..file.." line "..line.."\n")
end
if ev ~= events.SET then
if pausemsg and pausemsg ~= '' then io.write('Message: '..pausemsg..'\n') end
pausemsg = ''
end
return vars, file, line
end
--}}}
--{{{ local function debugger_loop(server)
local function debugger_loop(ev, vars, file, line, idx_watch)
io.write("Lua Debugger\n")
local eval_env, breakfile, breakline = report(ev, vars, file, line, idx_watch)
io.write("Type 'help' for commands\n")
local command, args
--{{{ local function getargs(spec)
--get command arguments according to the given spec from the args string
--the spec has a single character for each argument, arguments are separated
--by white space, the spec characters can be one of:
-- F for a filename (defaults to breakfile if - given in args)
-- L for a line number (defaults to breakline if - given in args)
-- N for a number
-- V for a variable name
-- S for a string
local function getargs(spec)
local res={}
local char,arg
local ptr=1
for i=1,string.len(spec) do
char = string.sub(spec,i,i)
if char == 'F' then
_,ptr,arg = string.find(args..' ',"%s*([%w%p]*)%s*",ptr)
if not arg or arg == '' then arg = '-' end
if arg == '-' then arg = breakfile end
elseif char == 'L' then
_,ptr,arg = string.find(args..' ',"%s*([%w%p]*)%s*",ptr)
if not arg or arg == '' then arg = '-' end
if arg == '-' then arg = breakline end
arg = tonumber(arg) or 0
elseif char == 'N' then
_,ptr,arg = string.find(args..' ',"%s*([%w%p]*)%s*",ptr)
if not arg or arg == '' then arg = '0' end
arg = tonumber(arg) or 0
elseif char == 'V' then
_,ptr,arg = string.find(args..' ',"%s*([%w%p]*)%s*",ptr)
if not arg or arg == '' then arg = '' end
elseif char == 'S' then
_,ptr,arg = string.find(args..' ',"%s*([%w%p]*)%s*",ptr)
if not arg or arg == '' then arg = '' end
else
arg = ''
end
table.insert(res,arg or '')
end
return unpack(res)
end
--}}}
while true do
local line = readline(prompt)
saveline(line)
if line == nil then io.write('\n'); line = 'exit' end
if string.find(line, "^[a-z]+") then
command = string.sub(line, string.find(line, "^[a-z]+"))
args = string.gsub(line,"^[a-z]+%s*",'',1) --strip command off line
else
command = ''
end
if command == "setb" then
--{{{ set breakpoint
local line, filename = getargs('LF')
if filename ~= '' and line ~= '' then
set_breakpoint(filename,line)
io.write("Breakpoint set in file "..filename..' line '..line..'\n')
else
io.write("Bad request\n")
end
--}}}
elseif command == "delb" then
--{{{ delete breakpoint
local line, filename = getargs('LF')
if filename ~= '' and line ~= '' then
remove_breakpoint(filename, line)
io.write("Breakpoint deleted from file "..filename..' line '..line.."\n")
else
io.write("Bad request\n")
end
--}}}
elseif command == "delallb" then
--{{{ delete all breakpoints
breakpoints = {}
io.write('All breakpoints deleted\n')
--}}}
elseif command == "listb" then
--{{{ list breakpoints
for i, v in pairs(breakpoints) do
for ii, vv in pairs(v) do
io.write("Break at: "..i..' in '..ii..'\n')
end
end
--}}}
elseif command == "setw" then
--{{{ set watch expression
if args and args ~= '' then
local func = loadstring("return(" .. args .. ")")
local newidx = #watches + 1
watches[newidx] = {func = func, exp = args}
io.write("Set watch exp no. " .. newidx..'\n')
else
io.write("Bad request\n")
end
--}}}
elseif command == "delw" then
--{{{ delete watch expression
local index = tonumber(args)
if index then
watches[index] = nil
io.write("Watch expression deleted\n")
else
io.write("Bad request\n")
end
--}}}
elseif command == "delallw" then
--{{{ delete all watch expressions
watches = {}
io.write('All watch expressions deleted\n')
--}}}
elseif command == "listw" then
--{{{ list watch expressions
for i, v in pairs(watches) do
io.write("Watch exp. " .. i .. ": " .. v.exp..'\n')
end
--}}}
elseif command == "run" then
--{{{ run until breakpoint
step_into = false
step_over = false
eval_env, breakfile, breakline = report(coroutine.yield('cont'))
--}}}
elseif command == "step" then
--{{{ step N lines (into functions)
local N = tonumber(args) or 1
step_over = false
step_into = true
step_lines = tonumber(N or 1)
eval_env, breakfile, breakline = report(coroutine.yield('cont'))
--}}}
elseif command == "over" then
--{{{ step N lines (over functions)
local N = tonumber(args) or 1
step_into = false
step_over = true
step_lines = tonumber(N or 1)
step_level[current_thread] = stack_level[current_thread]
eval_env, breakfile, breakline = report(coroutine.yield('cont'))
--}}}
elseif command == "out" then
--{{{ step N lines (out of functions)
local N = tonumber(args) or 1
step_into = false
step_over = true
step_lines = 1
step_level[current_thread] = stack_level[current_thread] - tonumber(N or 1)
eval_env, breakfile, breakline = report(coroutine.yield('cont'))
--}}}
elseif command == "goto" then
--{{{ step until reach line
local N = tonumber(args)
if N then
step_over = false
step_into = false
if has_breakpoint(breakfile,N) then
eval_env, breakfile, breakline = report(coroutine.yield('cont'))
else
local bf = breakfile
set_breakpoint(breakfile,N)
eval_env, breakfile, breakline = report(coroutine.yield('cont'))
if breakfile == bf and breakline == N then remove_breakpoint(breakfile,N) end
end
else
io.write("Bad request\n")
end
--}}}
elseif command == "set" then
--{{{ set/show context level
local level = args
if level and level == '' then level = nil end
if level then
eval_env, breakfile, breakline = report(coroutine.yield(level))
end
if eval_env.__VARSLEVEL__ then
io.write('Level: '..eval_env.__VARSLEVEL__..'\n')
else
io.write('No level set\n')
end
--}}}
elseif command == "vars" then
--{{{ list context variables
local depth = args
if depth and depth == '' then depth = nil end
depth = tonumber(depth) or 1
dumpvar(eval_env, depth+1, 'variables')
--}}}
elseif command == "glob" then
--{{{ list global variables
local depth = args
if depth and depth == '' then depth = nil end
depth = tonumber(depth) or 1
dumpvar(eval_env.__GLOBALS__,depth+1,'globals')
--}}}
elseif command == "fenv" then
--{{{ list function environment variables
local depth = args
if depth and depth == '' then depth = nil end
depth = tonumber(depth) or 1
dumpvar(eval_env.__ENVIRONMENT__,depth+1,'environment')
--}}}
elseif command == "ups" then
--{{{ list upvalue names
dumpvar(eval_env.__UPVALUES__,2,'upvalues')
--}}}
elseif command == "locs" then
--{{{ list locals names
dumpvar(eval_env.__LOCALS__,2,'upvalues')
--}}}
elseif command == "what" then
--{{{ show where a function is defined
if args and args ~= '' then
local v = eval_env
local n = nil
for w in string.gmatch(args,"[%w_]+") do
v = v[w]
if n then n = n..'.'..w else n = w end
if not v then break end
end
if type(v) == 'function' then
local def = debug.getinfo(v,'S')
if def then
io.write(def.what..' in '..def.short_src..' '..def.linedefined..'..'..def.lastlinedefined..'\n')
else
io.write('Cannot get info for '..v..'\n')
end
else
io.write(v..' is not a function\n')
end
else
io.write("Bad request\n")
end
--}}}
elseif command == "dump" then
--{{{ dump a variable
local name, depth = getargs('VN')
if name ~= '' then
if depth == '' or depth == 0 then depth = nil end
depth = tonumber(depth or 1)
local v = eval_env
local n = nil
for w in string.gmatch(name,"[^%.]+") do --get everything between dots
if tonumber(w) then
v = v[tonumber(w)]
else
v = v[w]
end
if n then n = n..'.'..w else n = w end
if not v then break end
end
dumpvar(v,depth+1,n)
else
io.write("Bad request\n")
end
--}}}
elseif command == "show" then
--{{{ show file around a line or the current breakpoint
local line, file, before, after = getargs('LFNN')
if before == 0 then before = 10 end
if after == 0 then after = before end
if file ~= '' and file ~= "=stdin" then
show(file,line,before,after)
else
io.write('Nothing to show\n')
end
--}}}
elseif command == "poff" then
--{{{ turn pause command off
pause_off = true
--}}}
elseif command == "pon" then
--{{{ turn pause command on
pause_off = false
--}}}
elseif command == "tron" then
--{{{ turn tracing on/off
local option = getargs('S')
trace_calls = false
trace_returns = false
trace_lines = false
if string.find(option,'c') then trace_calls = true end
if string.find(option,'r') then trace_returns = true end
if string.find(option,'l') then trace_lines = true end
--}}}
elseif command == "trace" then
--{{{ dump a stack trace
trace(eval_env.__VARSLEVEL__)
--}}}
elseif command == "info" then
--{{{ dump all debug info captured
info()
--}}}
elseif command == "pause" then
--{{{ not allowed in here
io.write('pause() should only be used in the script you are debugging\n')
--}}}
elseif command == "help" then
--{{{ help
local command = getargs('S')
if command ~= '' and hints[command] then
io.write(hints[command]..'\n')
else
for _,v in pairs(hints) do
local _,_,h = string.find(v,"(.+)|")
io.write(h..'\n')
end
end
--}}}
elseif command == "exit" then
--{{{ exit debugger
return 'stop'
--}}}
elseif line ~= '' then
--{{{ just execute whatever it is in the current context
--map line starting with "=..." to "return ..."
if string.sub(line,1,1) == '=' then line = string.gsub(line,'=','return ',1) end
local ok, func = pcall(loadstring,line)
if func == nil then --Michael.Bringmann@lsi.com
io.write("Compile error: "..line..'\n')
elseif not ok then
io.write("Compile error: "..func..'\n')
else
setfenv(func, eval_env)
local res = {pcall(func)}
if res[1] then
if res[2] then
table.remove(res,1)
for _,v in ipairs(res) do
io.write(tostring(v))
io.write('\t')
end
io.write('\n')
end
--update in the context
eval_env, breakfile, breakline = report(coroutine.yield(0))
else
io.write("Run error: "..res[2]..'\n')
end
end
--}}}
end
end
end
--}}}
--{{{ coroutine.create
--This function overrides the built-in for the purposes of propagating
--the debug hook settings from the creator into the created coroutine.
_G.coroutine.create = function(f)
local thread
local hook, mask, count = debug.gethook()
if hook then
local function thread_hook(event,line)
hook(event,line,3,thread)
end
thread = cocreate(function(...)
stack_level[thread] = 0
trace_level[thread] = 0
step_level [thread] = 0
debug.sethook(thread_hook,mask,count)
return f(...)
end)
return thread
else
return cocreate(f)
end
end
--}}}
--{{{ coroutine.wrap
--This function overrides the built-in for the purposes of propagating
--the debug hook settings from the creator into the created coroutine.
_G.coroutine.wrap = function(f)
local thread
local hook, mask, count = debug.gethook()
if hook then
local function thread_hook(event,line)
hook(event,line,3,thread)
end
thread = cowrap(function(...)
stack_level[thread] = 0
trace_level[thread] = 0
step_level [thread] = 0
debug.sethook(thread_hook,mask,count)
return f(...)
end)
return thread
else
return cowrap(f)
end
end
--}}}
--{{{ function pause()
--
-- Starts/resumes a debug session
--
function pause(x)
if pause_off then return end --being told to ignore pauses
pausemsg = x or 'pause'
local lines
local src = getinfo(2,'short_src')
if src == "stdin" then
lines = 1 --if in a console session, stop now
else
lines = 2 --if in a script, stop when get out of pause()
end
if started then
--we'll stop now 'cos the existing debug hook will grab us
step_lines = lines
step_into = true
else
coro_debugger = cocreate(debugger_loop) --NB: Use original coroutune.create
--set to stop when get out of pause()
trace_level[current_thread] = 0
step_level [current_thread] = 0
stack_level[current_thread] = 1
step_lines = lines
step_into = true
started = true
debug.sethook(debug_hook, "crl") --NB: this will cause an immediate entry to the debugger_loop
end
end
--}}}
--{{{ function dump()
--shows the value of the given variable, only really useful
--when the variable is a table
--see dump debug command hints for full semantics
function dump(v,depth)
dumpvar(v,(depth or 1)+1,tostring(v))
end
--}}}
--{{{ function debug.traceback(x)
local _traceback = debug.traceback --note original function
--override standard function
debug.traceback = function(x)
local assertmsg = _traceback(x) --do original function
pause(x) --let user have a look at stuff
return assertmsg --carry on
end
_TRACEBACK = debug.traceback --Lua 5.0 function
--}}}