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--Minetest
--Copyright (C) 2016 T4im
--
--This program is free software; you can redistribute it and/or modify
--it under the terms of the GNU Lesser General Public License as published by
--the Free Software Foundation; either version 2.1 of the License, or
--(at your option) any later version.
--
--This program is distributed in the hope that it will be useful,
--but WITHOUT ANY WARRANTY; without even the implied warranty of
--MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
--GNU Lesser General Public License for more details.
--
--You should have received a copy of the GNU Lesser General Public License along
--with this program; if not, write to the Free Software Foundation, Inc.,
--51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
local format, pairs, type = string.format, pairs, type
local core, get_current_modname = core, core.get_current_modname
local profiler, sampler, get_bool_default = ...
local instrument_builtin = get_bool_default("instrument.builtin", false)
local register_functions = {
register_globalstep = 0,
register_playerevent = 0,
register_on_placenode = 0,
register_on_dignode = 0,
register_on_punchnode = 0,
register_on_generated = 0,
register_on_newplayer = 0,
register_on_dieplayer = 0,
register_on_respawnplayer = 0,
register_on_prejoinplayer = 0,
register_on_joinplayer = 0,
register_on_leaveplayer = 0,
register_on_cheat = 0,
register_on_chat_message = 0,
register_on_player_receive_fields = 0,
register_on_craft = 0,
register_craft_predict = 0,
register_on_protection_violation = 0,
register_on_item_eat = 0,
register_on_punchplayer = 0,
register_on_player_hpchange = 0,
}
---
-- Create an unique instrument name.
-- Generate a missing label with a running index number.
--
local counts = {}
local function generate_name(def)
local class, label, func_name = def.class, def.label, def.func_name
if label then
if class or func_name then
return format("%s '%s' %s", class or "", label, func_name or ""):trim()
end
return format("%s", label):trim()
elseif label == false then
return format("%s", class or func_name):trim()
end
local index_id = def.mod .. (class or func_name)
local index = counts[index_id] or 1
counts[index_id] = index + 1
return format("%s[%d] %s", class or func_name, index, class and func_name or ""):trim()
end
---
-- Keep `measure` and the closure in `instrument` lean, as these, and their
-- directly called functions are the overhead that is caused by instrumentation.
--
local time, log = core.get_us_time, sampler.log
local function measure(modname, instrument_name, start, ...)
log(modname, instrument_name, time() - start)
return ...
end
--- Automatically instrument a function to measure and log to the sampler.
-- def = {
-- mod = "",
-- class = "",
-- func_name = "",
-- -- if nil, will create a label based on registration order
-- label = "" | false,
-- }
local function instrument(def)
if not def or not def.func then
return
end
def.mod = def.mod or get_current_modname() or "??"
local modname = def.mod
local instrument_name = generate_name(def)
local func = def.func
if not instrument_builtin and modname == "*builtin*" then
return func
end
return function(...)
-- This tail-call allows passing all return values of `func`
-- also called https://en.wikipedia.org/wiki/Continuation_passing_style
-- Compared to table creation and unpacking it won't lose `nil` returns
-- and is expected to be faster
-- `measure` will be executed after func(...)
local start = time()
return measure(modname, instrument_name, start, func(...))
end
end
local function can_be_called(func)
-- It has to be a function or callable table
return type(func) == "function" or
((type(func) == "table" or type(func) == "userdata") and
getmetatable(func) and getmetatable(func).__call)
end
local function assert_can_be_called(func, func_name, level)
if not can_be_called(func) then
-- Then throw an *helpful* error, by pointing on our caller instead of us.
error(format("Invalid argument to %s. Expected function-like type instead of '%s'.",
func_name, type(func)), level + 1)
end
end
---
-- Wraps a registration function `func` in such a way,
-- that it will automatically instrument any callback function passed as first argument.
--
local function instrument_register(func, func_name)
local register_name = func_name:gsub("^register_", "", 1)
return function(callback, ...)
assert_can_be_called(callback, func_name, 2)
register_functions[func_name] = register_functions[func_name] + 1
return func(instrument {
func = callback,
func_name = register_name
}, ...)
end
end
local function init_chatcommand()
if get_bool_default("instrument.chatcommand", true) then
local orig_register_chatcommand = core.register_chatcommand
core.register_chatcommand = function(cmd, def)
def.func = instrument {
func = def.func,
label = "/" .. cmd,
}
orig_register_chatcommand(cmd, def)
end
end
end
---
-- Start instrumenting selected functions
--
local function init()
if get_bool_default("instrument.entity", true) then
-- Explicitly declare entity api-methods.
-- Simple iteration would ignore lookup via __index.
local entity_instrumentation = {
"on_activate",
"on_deactivate",
"on_step",
"on_punch",
"on_rightclick",
"get_staticdata",
}
-- Wrap register_entity() to instrument them on registration.
local orig_register_entity = core.register_entity
core.register_entity = function(name, prototype)
local modname = get_current_modname()
for _, func_name in pairs(entity_instrumentation) do
prototype[func_name] = instrument {
func = prototype[func_name],
mod = modname,
func_name = func_name,
label = prototype.label,
}
end
orig_register_entity(name,prototype)
end
end
if get_bool_default("instrument.abm", true) then
-- Wrap register_abm() to automatically instrument abms.
local orig_register_abm = core.register_abm
core.register_abm = function(spec)
spec.action = instrument {
func = spec.action,
class = "ABM",
label = spec.label,
}
orig_register_abm(spec)
end
end
if get_bool_default("instrument.lbm", true) then
-- Wrap register_lbm() to automatically instrument lbms.
local orig_register_lbm = core.register_lbm
core.register_lbm = function(spec)
spec.action = instrument {
func = spec.action,
class = "LBM",
label = spec.label or spec.name,
}
orig_register_lbm(spec)
end
end
if get_bool_default("instrument.global_callback", true) then
for func_name, _ in pairs(register_functions) do
core[func_name] = instrument_register(core[func_name], func_name)
end
end
if get_bool_default("instrument.profiler", false) then
-- Measure overhead of instrumentation, but keep it down for functions
-- So keep the `return` for better optimization.
profiler.empty_instrument = instrument {
func = function() return end,
mod = "*profiler*",
class = "Instrumentation overhead",
label = false,
}
end
end
return {
register_functions = register_functions,
instrument = instrument,
init = init,
init_chatcommand = init_chatcommand,
}
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