122 lines
2.7 KiB
Lua
Executable File
122 lines
2.7 KiB
Lua
Executable File
#!/usr/bin/env lua
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local function usage ()
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print ([[Lua static checker
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Usage: ]] .. arg[0]:match('/?([^/]+)$') .. [[ LUASOURCE
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Reports globals.
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Warning: it does not report false negative, but is not exhaustive either.
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]])
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end
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if #arg < 1 then
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usage ()
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os.exit()
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end
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local builtins = {
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assert = true,
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collectgarbage = true,
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dofile = true,
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error = true,
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_G = true,
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getfenv = true,
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getmetatable = true,
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ipairs = true,
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load = true,
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loadfile = true,
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loadstring = true,
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next = true,
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pairs = true,
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pcall = true,
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print = true,
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rawequal = true,
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rawget = true,
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rawset = true,
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select = true,
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setfenv = true,
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setmetatable = true,
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tonumber = true,
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tostring = true,
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type = true,
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unpack = true,
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_VERSION = true,
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xpcall = true,
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module = true,
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package = true,
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require = true,
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coroutine = true,
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debug = true,
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io = true,
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math = true,
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os = true,
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string = true,
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table = true,
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}
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for _, file in ipairs(arg) do
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local p = io.popen('luac -p -l -- ' .. file)
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local globals = {}
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for m in p:lines() do
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if m:match('ETTABUP.*_ENV') then
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local line, op, field = m:match('%[([%d]+)%].*(.)ETTABUP.*"([_%w]+)"')
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if not builtins[field] then
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if op == 'G' then
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-- Global is used.
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if not globals[field] then globals[field] = {set = false, used = false, lines={}} end
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globals[field].used = true
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globals[field].lines[#globals[field].lines+1] = tonumber(line)
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else
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-- Global is set.
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if not globals[field] then globals[field] = {set = false, used = false, lines={}} end
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globals[field].set = true
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globals[field].lines[#globals[field].lines+1] = tonumber(line)
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end
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end
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end
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end
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p:close()
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local sorted = {}
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local out = {}
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for field, v in pairs(globals) do
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if v.set and v.used then
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-- Report only first appearance.
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sorted[#sorted+1] = v.lines[1]
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if not out[v.lines[1]] then out[v.lines[1]] = {} end
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out[v.lines[1]][#out[v.lines[1]]+1] = field
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else
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for _, line in ipairs(v.lines) do
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sorted[#sorted+1] = line
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if not out[line] then out[line] = {} end
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out[line][#out[line]+1] = field
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end
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end
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-- Free some memory.
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v.lines = nil
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end
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table.sort(sorted)
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for k, line in ipairs(sorted) do
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-- Sorted can contain the same line several times.
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if k == 1 or line ~= sorted[k-1] then
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for _, field in pairs(out[line]) do
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if globals[field].set and globals[field].used then
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io.stderr:write(string.format("%s:%s: global '%s' set and used\n", file, line, field))
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elseif globals[field].set and not globals[field].used then
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io.stderr:write(string.format("%s:%s: global '%s' set but not used\n", file, line, field))
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else
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io.stderr:write(string.format("%s:%s: global '%s' used but not set\n", file, line, field))
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end
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end
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end
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end
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end
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