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1e94262 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | -- $Id: testes/gengc.lua $
-- See Copyright Notice in file lua.h
print('testing generational garbage collection')
local debug = require"debug"
assert(collectgarbage("isrunning"))
collectgarbage()
local oldmode = collectgarbage("generational")
-- ensure that table barrier evolves correctly
do
local U = {}
-- full collection makes 'U' old
collectgarbage()
assert(not T or T.gcage(U) == "old")
-- U refers to a new table, so it becomes 'touched1'
U[1] = {x = {234}}
assert(not T or (T.gcage(U) == "touched1" and T.gcage(U[1]) == "new"))
-- both U and the table survive one more collection
collectgarbage("step")
assert(not T or (T.gcage(U) == "touched2" and T.gcage(U[1]) == "survival"))
-- both U and the table survive yet another collection
-- now everything is old
collectgarbage("step")
assert(not T or (T.gcage(U) == "old" and T.gcage(U[1]) == "old1"))
-- data was not corrupted
assert(U[1].x[1] == 234)
end
do
-- ensure that 'firstold1' is corrected when object is removed from
-- the 'allgc' list
local function foo () end
local old = {10}
collectgarbage() -- make 'old' old
assert(not T or T.gcage(old) == "old")
setmetatable(old, {}) -- new table becomes OLD0 (barrier)
assert(not T or T.gcage(getmetatable(old)) == "old0")
collectgarbage("step") -- new table becomes OLD1 and firstold1
assert(not T or T.gcage(getmetatable(old)) == "old1")
setmetatable(getmetatable(old), {__gc = foo}) -- get it out of allgc list
collectgarbage("step") -- should not seg. fault
end
do -- bug in 5.4.0
-- When an object aged OLD1 is finalized, it is moved from the list
-- 'finobj' to the *beginning* of the list 'allgc', but that part of the
-- list was not being visited by 'markold'.
local A = {}
A[1] = false -- old anchor for object
-- obj finalizer
local function gcf (obj)
A[1] = obj -- anchor object
assert(not T or T.gcage(obj) == "old1")
obj = nil -- remove it from the stack
collectgarbage("step") -- do a young collection
print(getmetatable(A[1]).x) -- metatable was collected
end
collectgarbage() -- make A old
local obj = {} -- create a new object
collectgarbage("step") -- make it a survival
assert(not T or T.gcage(obj) == "survival")
setmetatable(obj, {__gc = gcf, x = "+"}) -- create its metatable
assert(not T or T.gcage(getmetatable(obj)) == "new")
obj = nil -- clear object
collectgarbage("step") -- will call obj's finalizer
end
do -- another bug in 5.4.0
local old = {10}
collectgarbage() -- make 'old' old
local co = coroutine.create(
function ()
local x = nil
local f = function ()
return x[1]
end
x = coroutine.yield(f)
coroutine.yield()
end
)
local _, f = coroutine.resume(co) -- create closure over 'x' in coroutine
collectgarbage("step") -- make upvalue a survival
old[1] = {"hello"} -- 'old' go to grayagain as 'touched1'
coroutine.resume(co, {123}) -- its value will be new
co = nil
collectgarbage("step") -- hit the barrier
assert(f() == 123 and old[1][1] == "hello")
collectgarbage("step") -- run the collector once more
-- make sure old[1] was not collected
assert(f() == 123 and old[1][1] == "hello")
end
do -- bug introduced in commit 9cf3299fa
local t = setmetatable({}, {__mode = "kv"}) -- all-weak table
collectgarbage() -- full collection
assert(not T or T.gcage(t) == "old")
t[1] = {10}
assert(not T or (T.gcage(t) == "touched1" and T.gccolor(t) == "gray"))
collectgarbage("step") -- minor collection
assert(not T or (T.gcage(t) == "touched2" and T.gccolor(t) == "black"))
collectgarbage("step") -- minor collection
assert(not T or T.gcage(t) == "old") -- t should be black, but it was gray
t[1] = {10} -- no barrier here, so t was still old
collectgarbage("step") -- minor collection
-- t, being old, is ignored by the collection, so it is not cleared
assert(t[1] == nil) -- fails with the bug
end
if T == nil then
(Message or print)('\n >>> testC not active: \z
skipping some generational tests <<<\n')
print 'OK'
return
end
-- ensure that userdata barrier evolves correctly
do
local U = T.newuserdata(0, 1)
-- full collection makes 'U' old
collectgarbage()
assert(T.gcage(U) == "old")
-- U refers to a new table, so it becomes 'touched1'
debug.setuservalue(U, {x = {234}})
assert(T.gcage(U) == "touched1" and
T.gcage(debug.getuservalue(U)) == "new")
-- both U and the table survive one more collection
collectgarbage("step")
assert(T.gcage(U) == "touched2" and
T.gcage(debug.getuservalue(U)) == "survival")
-- both U and the table survive yet another collection
-- now everything is old
collectgarbage("step")
assert(T.gcage(U) == "old" and
T.gcage(debug.getuservalue(U)) == "old1")
-- data was not corrupted
assert(debug.getuservalue(U).x[1] == 234)
end
-- just to make sure
assert(collectgarbage'isrunning')
do print"testing stop-the-world collection"
local step = collectgarbage("param", "stepsize", 0);
collectgarbage("incremental")
assert(collectgarbage("param", "stepsize") == 0)
-- each step does a complete cycle
assert(collectgarbage("step"))
assert(collectgarbage("step"))
-- back to default value
collectgarbage("param", "stepsize", step);
assert(collectgarbage("param", "stepsize") == step)
end
collectgarbage(oldmode)
print('OK')
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