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https://github.com/lua/lua
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066e0f93c4
The flag CIST_FIN does not mark a finalizer, but the function that was running when the finalizer was called. (So, the function did not call the finalizer, but it looks that way in the stack.)
692 lines
18 KiB
Lua
692 lines
18 KiB
Lua
-- $Id: testes/gc.lua $
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-- See Copyright Notice in file all.lua
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print('testing incremental garbage collection')
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local debug = require"debug"
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assert(collectgarbage("isrunning"))
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collectgarbage()
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local oldmode = collectgarbage("incremental")
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-- changing modes should return previous mode
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assert(collectgarbage("generational") == "incremental")
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assert(collectgarbage("generational") == "generational")
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assert(collectgarbage("incremental") == "generational")
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assert(collectgarbage("incremental") == "incremental")
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local function nop () end
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local function gcinfo ()
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return collectgarbage"count" * 1024
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end
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-- test weird parameters to 'collectgarbage'
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do
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-- save original parameters
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local a = collectgarbage("setpause", 200)
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local b = collectgarbage("setstepmul", 200)
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local t = {0, 2, 10, 90, 500, 5000, 30000, 0x7ffffffe}
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for i = 1, #t do
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local p = t[i]
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for j = 1, #t do
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local m = t[j]
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collectgarbage("setpause", p)
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collectgarbage("setstepmul", m)
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collectgarbage("step", 0)
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collectgarbage("step", 10000)
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end
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end
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-- restore original parameters
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collectgarbage("setpause", a)
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collectgarbage("setstepmul", b)
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collectgarbage()
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end
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_G["while"] = 234
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--
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-- tests for GC activation when creating different kinds of objects
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--
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local function GC1 ()
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local u
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local b -- (above 'u' it in the stack)
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local finish = false
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u = setmetatable({}, {__gc = function () finish = true end})
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b = {34}
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repeat u = {} until finish
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assert(b[1] == 34) -- 'u' was collected, but 'b' was not
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finish = false; local i = 1
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u = setmetatable({}, {__gc = function () finish = true end})
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repeat i = i + 1; u = tostring(i) .. tostring(i) until finish
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assert(b[1] == 34) -- 'u' was collected, but 'b' was not
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finish = false
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u = setmetatable({}, {__gc = function () finish = true end})
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repeat local i; u = function () return i end until finish
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assert(b[1] == 34) -- 'u' was collected, but 'b' was not
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end
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local function GC2 ()
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local u
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local finish = false
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u = {setmetatable({}, {__gc = function () finish = true end})}
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local b = {34}
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repeat u = {{}} until finish
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assert(b[1] == 34) -- 'u' was collected, but 'b' was not
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finish = false; local i = 1
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u = {setmetatable({}, {__gc = function () finish = true end})}
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repeat i = i + 1; u = {tostring(i) .. tostring(i)} until finish
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assert(b[1] == 34) -- 'u' was collected, but 'b' was not
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finish = false
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u = {setmetatable({}, {__gc = function () finish = true end})}
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repeat local i; u = {function () return i end} until finish
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assert(b[1] == 34) -- 'u' was collected, but 'b' was not
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end
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local function GC() GC1(); GC2() end
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do
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print("creating many objects")
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local limit = 5000
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for i = 1, limit do
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local a = {}; a = nil
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end
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local a = "a"
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for i = 1, limit do
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a = i .. "b";
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a = string.gsub(a, '(%d%d*)', "%1 %1")
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a = "a"
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end
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a = {}
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function a:test ()
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for i = 1, limit do
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load(string.format("function temp(a) return 'a%d' end", i), "")()
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assert(temp() == string.format('a%d', i))
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end
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end
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a:test()
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end
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-- collection of functions without locals, globals, etc.
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do local f = function () end end
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print("functions with errors")
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prog = [[
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do
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a = 10;
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function foo(x,y)
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a = sin(a+0.456-0.23e-12);
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return function (z) return sin(%x+z) end
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end
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local x = function (w) a=a+w; end
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end
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]]
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do
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local step = 1
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if _soft then step = 13 end
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for i=1, string.len(prog), step do
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for j=i, string.len(prog), step do
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pcall(load(string.sub(prog, i, j), ""))
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end
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end
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end
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foo = nil
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print('long strings')
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x = "01234567890123456789012345678901234567890123456789012345678901234567890123456789"
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assert(string.len(x)==80)
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s = ''
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k = math.min(300, (math.maxinteger // 80) // 2)
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for n = 1, k do s = s..x; j=tostring(n) end
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assert(string.len(s) == k*80)
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s = string.sub(s, 1, 10000)
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s, i = string.gsub(s, '(%d%d%d%d)', '')
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assert(i==10000 // 4)
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s = nil
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x = nil
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assert(_G["while"] == 234)
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--
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-- test the "size" of basic GC steps (whatever they mean...)
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--
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do
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print("steps")
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print("steps (2)")
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local function dosteps (siz)
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collectgarbage()
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local a = {}
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for i=1,100 do a[i] = {{}}; local b = {} end
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local x = gcinfo()
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local i = 0
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repeat -- do steps until it completes a collection cycle
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i = i+1
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until collectgarbage("step", siz)
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assert(gcinfo() < x)
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return i -- number of steps
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end
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collectgarbage"stop"
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if not _port then
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assert(dosteps(10) < dosteps(2))
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end
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-- collector should do a full collection with so many steps
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assert(dosteps(20000) == 1)
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assert(collectgarbage("step", 20000) == true)
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assert(collectgarbage("step", 20000) == true)
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assert(not collectgarbage("isrunning"))
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collectgarbage"restart"
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assert(collectgarbage("isrunning"))
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end
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if not _port then
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-- test the pace of the collector
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collectgarbage(); collectgarbage()
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local x = gcinfo()
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collectgarbage"stop"
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repeat
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local a = {}
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until gcinfo() > 3 * x
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collectgarbage"restart"
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assert(collectgarbage("isrunning"))
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repeat
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local a = {}
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until gcinfo() <= x * 2
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end
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print("clearing tables")
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lim = 15
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a = {}
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-- fill a with `collectable' indices
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for i=1,lim do a[{}] = i end
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b = {}
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for k,v in pairs(a) do b[k]=v end
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-- remove all indices and collect them
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for n in pairs(b) do
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a[n] = undef
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assert(type(n) == 'table' and next(n) == nil)
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collectgarbage()
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end
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b = nil
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collectgarbage()
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for n in pairs(a) do error'cannot be here' end
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for i=1,lim do a[i] = i end
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for i=1,lim do assert(a[i] == i) end
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print('weak tables')
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a = {}; setmetatable(a, {__mode = 'k'});
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-- fill a with some `collectable' indices
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for i=1,lim do a[{}] = i end
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-- and some non-collectable ones
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for i=1,lim do a[i] = i end
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for i=1,lim do local s=string.rep('@', i); a[s] = s..'#' end
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collectgarbage()
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local i = 0
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for k,v in pairs(a) do assert(k==v or k..'#'==v); i=i+1 end
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assert(i == 2*lim)
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a = {}; setmetatable(a, {__mode = 'v'});
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a[1] = string.rep('b', 21)
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collectgarbage()
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assert(a[1]) -- strings are *values*
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a[1] = undef
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-- fill a with some `collectable' values (in both parts of the table)
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for i=1,lim do a[i] = {} end
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for i=1,lim do a[i..'x'] = {} end
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-- and some non-collectable ones
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for i=1,lim do local t={}; a[t]=t end
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for i=1,lim do a[i+lim]=i..'x' end
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collectgarbage()
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local i = 0
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for k,v in pairs(a) do assert(k==v or k-lim..'x' == v); i=i+1 end
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assert(i == 2*lim)
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a = {}; setmetatable(a, {__mode = 'kv'});
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local x, y, z = {}, {}, {}
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-- keep only some items
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a[1], a[2], a[3] = x, y, z
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a[string.rep('$', 11)] = string.rep('$', 11)
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-- fill a with some `collectable' values
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for i=4,lim do a[i] = {} end
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for i=1,lim do a[{}] = i end
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for i=1,lim do local t={}; a[t]=t end
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collectgarbage()
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assert(next(a) ~= nil)
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local i = 0
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for k,v in pairs(a) do
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assert((k == 1 and v == x) or
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(k == 2 and v == y) or
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(k == 3 and v == z) or k==v);
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i = i+1
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end
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assert(i == 4)
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x,y,z=nil
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collectgarbage()
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assert(next(a) == string.rep('$', 11))
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-- 'bug' in 5.1
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a = {}
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local t = {x = 10}
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local C = setmetatable({key = t}, {__mode = 'v'})
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local C1 = setmetatable({[t] = 1}, {__mode = 'k'})
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a.x = t -- this should not prevent 't' from being removed from
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-- weak table 'C' by the time 'a' is finalized
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setmetatable(a, {__gc = function (u)
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assert(C.key == nil)
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assert(type(next(C1)) == 'table')
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end})
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a, t = nil
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collectgarbage()
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collectgarbage()
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assert(next(C) == nil and next(C1) == nil)
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C, C1 = nil
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-- ephemerons
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local mt = {__mode = 'k'}
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a = {{10},{20},{30},{40}}; setmetatable(a, mt)
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x = nil
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for i = 1, 100 do local n = {}; a[n] = {k = {x}}; x = n end
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GC()
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local n = x
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local i = 0
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while n do n = a[n].k[1]; i = i + 1 end
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assert(i == 100)
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x = nil
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GC()
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for i = 1, 4 do assert(a[i][1] == i * 10); a[i] = undef end
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assert(next(a) == nil)
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local K = {}
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a[K] = {}
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for i=1,10 do a[K][i] = {}; a[a[K][i]] = setmetatable({}, mt) end
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x = nil
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local k = 1
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for j = 1,100 do
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local n = {}; local nk = k%10 + 1
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a[a[K][nk]][n] = {x, k = k}; x = n; k = nk
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end
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GC()
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local n = x
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local i = 0
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while n do local t = a[a[K][k]][n]; n = t[1]; k = t.k; i = i + 1 end
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assert(i == 100)
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K = nil
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GC()
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-- assert(next(a) == nil)
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-- testing errors during GC
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if T then
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collectgarbage("stop") -- stop collection
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local u = {}
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local s = {}; setmetatable(s, {__mode = 'k'})
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setmetatable(u, {__gc = function (o)
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local i = s[o]
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s[i] = true
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assert(not s[i - 1]) -- check proper finalization order
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if i == 8 then error("@expected@") end -- error during GC
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end})
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for i = 6, 10 do
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local n = setmetatable({}, getmetatable(u))
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s[n] = i
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end
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warn("@on"); warn("@store")
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collectgarbage()
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assert(string.find(_WARN, "error in __gc"))
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assert(string.match(_WARN, "@(.-)@") == "expected"); _WARN = false
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for i = 8, 10 do assert(s[i]) end
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for i = 1, 5 do
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local n = setmetatable({}, getmetatable(u))
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s[n] = i
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end
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collectgarbage()
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for i = 1, 10 do assert(s[i]) end
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getmetatable(u).__gc = nil
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warn("@normal")
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end
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print '+'
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-- testing userdata
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if T==nil then
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(Message or print)('\n >>> testC not active: skipping userdata GC tests <<<\n')
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else
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local function newproxy(u)
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return debug.setmetatable(T.newuserdata(0), debug.getmetatable(u))
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end
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collectgarbage("stop") -- stop collection
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local u = newproxy(nil)
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debug.setmetatable(u, {__gc = true})
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local s = 0
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local a = {[u] = 0}; setmetatable(a, {__mode = 'vk'})
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for i=1,10 do a[newproxy(u)] = i end
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for k in pairs(a) do assert(getmetatable(k) == getmetatable(u)) end
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local a1 = {}; for k,v in pairs(a) do a1[k] = v end
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for k,v in pairs(a1) do a[v] = k end
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for i =1,10 do assert(a[i]) end
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getmetatable(u).a = a1
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getmetatable(u).u = u
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do
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local u = u
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getmetatable(u).__gc = function (o)
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assert(a[o] == 10-s)
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assert(a[10-s] == undef) -- udata already removed from weak table
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assert(getmetatable(o) == getmetatable(u))
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assert(getmetatable(o).a[o] == 10-s)
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s=s+1
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end
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end
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a1, u = nil
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assert(next(a) ~= nil)
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collectgarbage()
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assert(s==11)
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collectgarbage()
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assert(next(a) == nil) -- finalized keys are removed in two cycles
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end
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-- __gc x weak tables
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local u = setmetatable({}, {__gc = true})
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-- __gc metamethod should be collected before running
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setmetatable(getmetatable(u), {__mode = "v"})
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getmetatable(u).__gc = function (o) os.exit(1) end -- cannot happen
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u = nil
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collectgarbage()
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local u = setmetatable({}, {__gc = true})
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local m = getmetatable(u)
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m.x = {[{0}] = 1; [0] = {1}}; setmetatable(m.x, {__mode = "kv"});
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m.__gc = function (o)
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assert(next(getmetatable(o).x) == nil)
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m = 10
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end
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u, m = nil
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collectgarbage()
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assert(m==10)
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do -- tests for string keys in weak tables
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collectgarbage(); collectgarbage()
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local m = collectgarbage("count") -- current memory
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local a = setmetatable({}, {__mode = "kv"})
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a[string.rep("a", 2^22)] = 25 -- long string key -> number value
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a[string.rep("b", 2^22)] = {} -- long string key -> colectable value
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a[{}] = 14 -- colectable key
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assert(collectgarbage("count") > m + 2^13) -- 2^13 == 2 * 2^22 in KB
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collectgarbage()
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assert(collectgarbage("count") >= m + 2^12 and
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collectgarbage("count") < m + 2^13) -- one key was collected
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local k, v = next(a) -- string key with number value preserved
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assert(k == string.rep("a", 2^22) and v == 25)
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assert(next(a, k) == nil) -- everything else cleared
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assert(a[string.rep("b", 2^22)] == undef)
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a[k] = undef -- erase this last entry
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k = nil
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collectgarbage()
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assert(next(a) == nil)
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-- make sure will not try to compare with dead key
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assert(a[string.rep("b", 100)] == undef)
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assert(collectgarbage("count") <= m + 1) -- eveything collected
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end
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-- errors during collection
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if T then
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warn("@store")
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u = setmetatable({}, {__gc = function () error "@expected error" end})
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u = nil
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collectgarbage()
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assert(string.find(_WARN, "@expected error")); _WARN = false
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warn("@normal")
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end
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if not _soft then
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print("long list")
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local a = {}
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for i = 1,200000 do
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a = {next = a}
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end
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a = nil
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collectgarbage()
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end
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-- create many threads with self-references and open upvalues
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print("self-referenced threads")
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local thread_id = 0
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local threads = {}
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local function fn (thread)
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local x = {}
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threads[thread_id] = function()
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thread = x
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end
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coroutine.yield()
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end
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while thread_id < 1000 do
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local thread = coroutine.create(fn)
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coroutine.resume(thread, thread)
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thread_id = thread_id + 1
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end
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-- Create a closure (function inside 'f') with an upvalue ('param') that
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-- points (through a table) to the closure itself and to the thread
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-- ('co' and the initial value of 'param') where closure is running.
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-- Then, assert that table (and therefore everything else) will be
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-- collected.
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do
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local collected = false -- to detect collection
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collectgarbage(); collectgarbage("stop")
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|
do
|
|
local function f (param)
|
|
;(function ()
|
|
assert(type(f) == 'function' and type(param) == 'thread')
|
|
param = {param, f}
|
|
setmetatable(param, {__gc = function () collected = true end})
|
|
coroutine.yield(100)
|
|
end)()
|
|
end
|
|
local co = coroutine.create(f)
|
|
assert(coroutine.resume(co, co))
|
|
end
|
|
-- Now, thread and closure are not reacheable any more.
|
|
collectgarbage()
|
|
assert(collected)
|
|
collectgarbage("restart")
|
|
end
|
|
|
|
|
|
do
|
|
collectgarbage()
|
|
collectgarbage"stop"
|
|
collectgarbage("step", 0) -- steps should not unblock the collector
|
|
local x = gcinfo()
|
|
repeat
|
|
for i=1,1000 do _ENV.a = {} end -- no collection during the loop
|
|
until gcinfo() > 2 * x
|
|
collectgarbage"restart"
|
|
end
|
|
|
|
|
|
if T then -- tests for weird cases collecting upvalues
|
|
|
|
local function foo ()
|
|
local a = {x = 20}
|
|
coroutine.yield(function () return a.x end) -- will run collector
|
|
assert(a.x == 20) -- 'a' is 'ok'
|
|
a = {x = 30} -- create a new object
|
|
assert(T.gccolor(a) == "white") -- of course it is new...
|
|
coroutine.yield(100) -- 'a' is still local to this thread
|
|
end
|
|
|
|
local t = setmetatable({}, {__mode = "kv"})
|
|
collectgarbage(); collectgarbage('stop')
|
|
-- create coroutine in a weak table, so it will never be marked
|
|
t.co = coroutine.wrap(foo)
|
|
local f = t.co() -- create function to access local 'a'
|
|
T.gcstate("atomic") -- ensure all objects are traversed
|
|
assert(T.gcstate() == "atomic")
|
|
assert(t.co() == 100) -- resume coroutine, creating new table for 'a'
|
|
assert(T.gccolor(t.co) == "white") -- thread was not traversed
|
|
T.gcstate("pause") -- collect thread, but should mark 'a' before that
|
|
assert(t.co == nil and f() == 30) -- ensure correct access to 'a'
|
|
|
|
collectgarbage("restart")
|
|
|
|
-- test barrier in sweep phase (backing userdata to gray)
|
|
local u = T.newuserdata(0, 1) -- create a userdata
|
|
collectgarbage()
|
|
collectgarbage"stop"
|
|
local a = {} -- avoid 'u' as first element in 'allgc'
|
|
T.gcstate"atomic"
|
|
T.gcstate"sweepallgc"
|
|
local x = {}
|
|
assert(T.gccolor(u) == "black") -- userdata is "old" (black)
|
|
assert(T.gccolor(x) == "white") -- table is "new" (white)
|
|
debug.setuservalue(u, x) -- trigger barrier
|
|
assert(T.gccolor(u) == "gray") -- userdata changed back to gray
|
|
collectgarbage"restart"
|
|
|
|
print"+"
|
|
end
|
|
|
|
|
|
if T then
|
|
local debug = require "debug"
|
|
collectgarbage("stop")
|
|
local x = T.newuserdata(0)
|
|
local y = T.newuserdata(0)
|
|
debug.setmetatable(y, {__gc = nop}) -- bless the new udata before...
|
|
debug.setmetatable(x, {__gc = nop}) -- ...the old one
|
|
assert(T.gccolor(y) == "white")
|
|
T.checkmemory()
|
|
collectgarbage("restart")
|
|
end
|
|
|
|
|
|
if T then
|
|
print("emergency collections")
|
|
collectgarbage()
|
|
collectgarbage()
|
|
T.totalmem(T.totalmem() + 200)
|
|
for i=1,200 do local a = {} end
|
|
T.totalmem(0)
|
|
collectgarbage()
|
|
local t = T.totalmem("table")
|
|
local a = {{}, {}, {}} -- create 4 new tables
|
|
assert(T.totalmem("table") == t + 4)
|
|
t = T.totalmem("function")
|
|
a = function () end -- create 1 new closure
|
|
assert(T.totalmem("function") == t + 1)
|
|
t = T.totalmem("thread")
|
|
a = coroutine.create(function () end) -- create 1 new coroutine
|
|
assert(T.totalmem("thread") == t + 1)
|
|
end
|
|
|
|
|
|
-- create an object to be collected when state is closed
|
|
do
|
|
local setmetatable,assert,type,print,getmetatable =
|
|
setmetatable,assert,type,print,getmetatable
|
|
local tt = {}
|
|
tt.__gc = function (o)
|
|
assert(getmetatable(o) == tt)
|
|
-- create new objects during GC
|
|
local a = 'xuxu'..(10+3)..'joao', {}
|
|
___Glob = o -- ressurrect object!
|
|
setmetatable({}, tt) -- creates a new one with same metatable
|
|
print(">>> closing state " .. "<<<\n")
|
|
end
|
|
local u = setmetatable({}, tt)
|
|
___Glob = {u} -- avoid object being collected before program end
|
|
end
|
|
|
|
-- create several objects to raise errors when collected while closing state
|
|
if T then
|
|
local error, assert, find, warn = error, assert, string.find, warn
|
|
local n = 0
|
|
local lastmsg
|
|
local mt = {__gc = function (o)
|
|
n = n + 1
|
|
assert(n == o[1])
|
|
if n == 1 then
|
|
_WARN = false
|
|
elseif n == 2 then
|
|
assert(find(_WARN, "@expected warning"))
|
|
lastmsg = _WARN -- get message from previous error (first 'o')
|
|
else
|
|
assert(lastmsg == _WARN) -- subsequent error messages are equal
|
|
end
|
|
warn("@store"); _WARN = false
|
|
error"@expected warning"
|
|
end}
|
|
for i = 10, 1, -1 do
|
|
-- create object and preserve it until the end
|
|
table.insert(___Glob, setmetatable({i}, mt))
|
|
end
|
|
end
|
|
|
|
-- just to make sure
|
|
assert(collectgarbage'isrunning')
|
|
|
|
do -- check that the collector is not reentrant in incremental mode
|
|
local res = true
|
|
setmetatable({}, {__gc = function ()
|
|
res = collectgarbage()
|
|
end})
|
|
collectgarbage()
|
|
assert(not res)
|
|
end
|
|
|
|
|
|
collectgarbage(oldmode)
|
|
|
|
print('OK')
|