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|
local clock = os.clock
local profile = {}
-- function labels
local _labeled = {}
-- function definitions
local _defined = {}
-- time of last call
local _tcalled = {}
-- total execution time
local _telapsed = {}
-- number of calls
local _ncalls = {}
-- list of internal profiler functions
local _internal = {}
function profile.hooker(event, line, info)
info = info or debug.getinfo(2, 'fnS')
local f = info.func
-- ignore the profiler itself
if _internal[f] or info.what ~= "Lua" then
return
end
-- get the function name if available
if info.name then
_labeled[f] = info.name
end
-- find the line definition
if not _defined[f] then
_defined[f] = info.short_src..":"..info.linedefined
_ncalls[f] = 0
_telapsed[f] = 0
end
if _tcalled[f] then
local dt = clock() - _tcalled[f]
_telapsed[f] = _telapsed[f] + dt
_tcalled[f] = nil
end
if event == "tail call" then
local prev = debug.getinfo(3, 'fnS')
profile.hooker("return", line, prev)
profile.hooker("call", line, info)
elseif event == 'call' then
_tcalled[f] = clock()
else
_ncalls[f] = _ncalls[f] + 1
end
end
--- Sets a clock function to be used by the profiler.
-- @param f Clock function that returns a number
function profile.setclock(f)
assert(type(f) == "function", "clock must be a function")
clock = f
end
--- Starts collecting data.
function profile.start()
if rawget(_G, 'jit') then
jit.off()
jit.flush()
end
debug.sethook(profile.hooker, "cr")
end
--- Stops collecting data.
function profile.stop()
debug.sethook()
for f in pairs(_tcalled) do
local dt = clock() - _tcalled[f]
_telapsed[f] = _telapsed[f] + dt
_tcalled[f] = nil
end
-- merge closures
local lookup = {}
for f, d in pairs(_defined) do
local id = (_labeled[f] or '?')..d
local f2 = lookup[id]
if f2 then
_ncalls[f2] = _ncalls[f2] + (_ncalls[f] or 0)
_telapsed[f2] = _telapsed[f2] + (_telapsed[f] or 0)
_defined[f], _labeled[f] = nil, nil
_ncalls[f], _telapsed[f] = nil, nil
else
lookup[id] = f
end
end
collectgarbage('collect')
end
--- Resets all collected data.
function profile.reset()
for f in pairs(_ncalls) do
_ncalls[f] = 0
end
for f in pairs(_telapsed) do
_telapsed[f] = 0
end
for f in pairs(_tcalled) do
_tcalled[f] = nil
end
collectgarbage('collect')
end
function profile.comp(a, b)
local dt = _telapsed[b] - _telapsed[a]
if dt == 0 then
return _ncalls[b] < _ncalls[a]
end
return dt < 0
end
--- Iterates all functions that have been called since the profile was started.
-- @param n Number of results (optional)
function profile.query(limit)
local t = {}
for f, n in pairs(_ncalls) do
if n > 0 then
t[#t + 1] = f
end
end
table.sort(t, profile.comp)
if limit then
while #t > limit do
table.remove(t)
end
end
for i, f in ipairs(t) do
local dt = 0
if _tcalled[f] then
dt = clock() - _tcalled[f]
end
t[i] = { i, _labeled[f] or '?', _ncalls[f], _telapsed[f] + dt, _defined[f] }
end
return t
end
local cols = { 3, 29, 11, 24, 32 }
function profile.report(n)
local out = {}
local report = profile.query(n)
for i, row in ipairs(report) do
for j = 1, 5 do
local s = row[j]
local l2 = cols[j]
s = tostring(s)
local l1 = s:len()
if l1 < l2 then
s = s..(' '):rep(l2-l1)
elseif l1 > l2 then
s = s:sub(l1 - l2 + 1, l1)
end
row[j] = s
end
out[i] = table.concat(row, ' | ')
end
local row = " +-----+-------------------------------+-------------+--------------------------+----------------------------------+ \n"
local col = " | # | Function | Calls | Time | Code | \n"
local sz = row..col..row
if #out > 0 then
sz = sz..' | '..table.concat(out, ' | \n | ')..' | \n'
end
return '\n'..sz..row
end
-- store all internal profiler functions
for k, v in pairs(profile) do
if type(v) == "function" then
_internal[v] = true
end
end
return profile
|
