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profiler.lua
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profiler.lua
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-- Require luasocket only when needed.
local socket
local profiler = {}
local metrics = {
{name = "Wall", get = function() return socket.gettime() end},
{name = "CPU", get = os.clock},
{name = "Memory", get = function() return collectgarbage("count") end}
}
local functions = {
{name = "sha1", module = "vendor.sha1"},
{name = "load", module = "cache"},
{name = "update", module = "cache"},
{name = "decode", module = "decoder"},
{name = "parse", module = "parser"},
{name = "dump_check_result", module = "serializer"},
{name = "load_check_result", module = "serializer"},
{name = "run", module = "stages.unwrap_parens"},
{name = "run", module = "stages.parse_inline_options"},
{name = "run", module = "stages.linearize"},
{name = "run", module = "stages.name_functions"},
{name = "run", module = "stages.resolve_locals"},
{name = "run", module = "stages.detect_bad_whitespace"},
{name = "run", module = "stages.detect_cyclomatic_complexity"},
{name = "run", module = "stages.detect_empty_blocks"},
{name = "run", module = "stages.detect_empty_statements"},
{name = "run", module = "stages.detect_globals"},
{name = "run", module = "stages.detect_reversed_fornum_loops"},
{name = "run", module = "stages.detect_unbalanced_assignments"},
{name = "run", module = "stages.detect_uninit_accesses"},
{name = "run", module = "stages.detect_unreachable_code"},
{name = "run", module = "stages.detect_unused_fields"},
{name = "run", module = "stages.detect_unused_locals"},
{name = "filter", module = "filter"},
{name = "normalize", module = "options"}
}
local stats = {}
local start_values = {}
local function start_phase(name)
for _, metric in ipairs(metrics) do
start_values[metric][name] = metric.get()
end
end
local function stop_phase(name)
for _, metric in ipairs(metrics) do
local increment = metric.get() - start_values[metric][name]
stats[metric][name] = (stats[metric][name] or 0) + increment
end
end
local phase_stack = {}
local function push_phase(name)
local prev_name = phase_stack[#phase_stack]
if prev_name then
stop_phase(prev_name)
end
table.insert(phase_stack, name)
start_phase(name)
end
local function pop_phase(name)
assert(name == table.remove(phase_stack))
stop_phase(name)
local prev_name = phase_stack[#phase_stack]
if prev_name then
start_phase(prev_name)
end
end
local function continue_wrapper(name, ...)
pop_phase(name)
return ...
end
local function wrap(fn, name)
return function(...)
push_phase(name)
return continue_wrapper(name, fn(...))
end
end
local function patch(fn)
local mod = require("luacheck." .. fn.module)
local orig = mod[fn.name]
local new = wrap(orig, fn.module .. "." .. fn.name)
mod[fn.name] = new
end
function profiler.init()
socket = require "socket"
collectgarbage("stop")
for _, metric in ipairs(metrics) do
stats[metric] = {}
start_values[metric] = {}
end
for _, fn in ipairs(functions) do
patch(fn)
end
push_phase("other")
end
function profiler.report()
pop_phase("other")
for _, metric in ipairs(metrics) do
local names = {}
local total = 0
for name, value in pairs(stats[metric]) do
table.insert(names, name)
total = total + value
end
table.sort(names, function(name1, name2)
local stats1 = stats[metric][name1]
local stats2 = stats[metric][name2]
if stats1 ~= stats2 then
return stats1 > stats2
else
return name1 < name2
end
end)
print(metric.name)
print()
for _, name in ipairs(names) do
print(("%s - %f (%f%%)"):format(name, stats[metric][name], stats[metric][name] / total * 100))
end
print(("Total - %f"):format(total))
print()
end
end
return profiler