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lua/testes/api.lua
Roberto Ierusalimschy 65b07dd53d API asserts for illegal pops of to-be-closed variables
2024-03-11 14:05:06 -03:00

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-- $Id: testes/api.lua $
-- See Copyright Notice in file all.lua
if T==nil then
(Message or print)('\n >>> testC not active: skipping API tests <<<\n')
return
end
local debug = require "debug"
local pack = table.pack
-- standard error message for memory errors
local MEMERRMSG = "not enough memory"
local function tcheck (t1, t2)
assert(t1.n == (t2.n or #t2) + 1)
for i = 2, t1.n do assert(t1[i] == t2[i - 1]) end
end
local function checkerr (msg, f, ...)
local stat, err = pcall(f, ...)
assert(not stat and string.find(err, msg))
end
print('testing C API')
local a = T.testC("pushvalue R; return 1")
assert(a == debug.getregistry())
-- absindex
assert(T.testC("settop 10; absindex -1; return 1") == 10)
assert(T.testC("settop 5; absindex -5; return 1") == 1)
assert(T.testC("settop 10; absindex 1; return 1") == 1)
assert(T.testC("settop 10; absindex R; return 1") < -10)
-- testing alignment
a = T.d2s(12458954321123.0)
assert(a == string.pack("d", 12458954321123.0))
assert(T.s2d(a) == 12458954321123.0)
local a,b,c = T.testC("pushnum 1; pushnum 2; pushnum 3; return 2")
assert(a == 2 and b == 3 and not c)
local f = T.makeCfunc("pushnum 1; pushnum 2; pushnum 3; return 2")
a,b,c = f()
assert(a == 2 and b == 3 and not c)
-- test that all trues are equal
a,b,c = T.testC("pushbool 1; pushbool 2; pushbool 0; return 3")
assert(a == b and a == true and c == false)
a,b,c = T.testC"pushbool 0; pushbool 10; pushnil;\
tobool -3; tobool -3; tobool -3; return 3"
assert(a==false and b==true and c==false)
a,b,c = T.testC("gettop; return 2", 10, 20, 30, 40)
assert(a == 40 and b == 5 and not c)
local t = pack(T.testC("settop 5; return *", 2, 3))
tcheck(t, {n=4,2,3})
t = pack(T.testC("settop 0; settop 15; return 10", 3, 1, 23))
assert(t.n == 10 and t[1] == nil and t[10] == nil)
t = pack(T.testC("remove -2; return *", 2, 3, 4))
tcheck(t, {n=2,2,4})
t = pack(T.testC("insert -1; return *", 2, 3))
tcheck(t, {n=2,2,3})
t = pack(T.testC("insert 3; return *", 2, 3, 4, 5))
tcheck(t, {n=4,2,5,3,4})
t = pack(T.testC("replace 2; return *", 2, 3, 4, 5))
tcheck(t, {n=3,5,3,4})
t = pack(T.testC("replace -2; return *", 2, 3, 4, 5))
tcheck(t, {n=3,2,3,5})
t = pack(T.testC("remove 3; return *", 2, 3, 4, 5))
tcheck(t, {n=3,2,4,5})
t = pack(T.testC("copy 3 4; return *", 2, 3, 4, 5))
tcheck(t, {n=4,2,3,3,5})
t = pack(T.testC("copy -3 -1; return *", 2, 3, 4, 5))
tcheck(t, {n=4,2,3,4,3})
do -- testing 'rotate'
local t = {10, 20, 30, 40, 50, 60}
for i = -6, 6 do
local s = string.format("rotate 2 %d; return 7", i)
local t1 = pack(T.testC(s, 10, 20, 30, 40, 50, 60))
tcheck(t1, t)
table.insert(t, 1, table.remove(t))
end
t = pack(T.testC("rotate -2 1; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 40, 30})
t = pack(T.testC("rotate -2 -1; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 40, 30})
-- some corner cases
t = pack(T.testC("rotate -1 0; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 30, 40})
t = pack(T.testC("rotate -1 1; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 30, 40})
t = pack(T.testC("rotate 5 -1; return *", 10, 20, 30, 40))
tcheck(t, {10, 20, 30, 40})
end
-- testing warnings
T.testC([[
warningC "#This shold be a"
warningC " single "
warning "warning"
warningC "#This should be "
warning "another one"
]])
-- testing message handlers
do
local f = T.makeCfunc[[
getglobal error
pushstring bola
pcall 1 1 1 # call 'error' with given handler
pushstatus
return 2 # return error message and status
]]
local msg, st = f(string.upper) -- function handler
assert(st == "ERRRUN" and msg == "BOLA")
local msg, st = f(string.len) -- function handler
assert(st == "ERRRUN" and msg == 4)
end
t = pack(T.testC("insert 3; pushvalue 3; remove 3; pushvalue 2; remove 2; \
insert 2; pushvalue 1; remove 1; insert 1; \
insert -2; pushvalue -2; remove -3; return *",
2, 3, 4, 5, 10, 40, 90))
tcheck(t, {n=7,2,3,4,5,10,40,90})
t = pack(T.testC("concat 5; return *", "alo", 2, 3, "joao", 12))
tcheck(t, {n=1,"alo23joao12"})
-- testing MULTRET
t = pack(T.testC("call 2,-1; return *",
function (a,b) return 1,2,3,4,a,b end, "alo", "joao"))
tcheck(t, {n=6,1,2,3,4,"alo", "joao"})
do -- test returning more results than fit in the caller stack
local a = {}
for i=1,1000 do a[i] = true end; a[999] = 10
local b = T.testC([[pcall 1 -1 0; pop 1; tostring -1; return 1]],
table.unpack, a)
assert(b == "10")
end
-- testing globals
_G.AA = 14; _G.BB = "a31"
local a = {T.testC[[
getglobal AA;
getglobal BB;
getglobal BB;
setglobal AA;
return *
]]}
assert(a[2] == 14 and a[3] == "a31" and a[4] == nil and _G.AA == "a31")
_G.AA, _G.BB = nil
-- testing arith
assert(T.testC("pushnum 10; pushnum 20; arith /; return 1") == 0.5)
assert(T.testC("pushnum 10; pushnum 20; arith -; return 1") == -10)
assert(T.testC("pushnum 10; pushnum -20; arith *; return 1") == -200)
assert(T.testC("pushnum 10; pushnum 3; arith ^; return 1") == 1000)
assert(T.testC("pushnum 10; pushstring 20; arith /; return 1") == 0.5)
assert(T.testC("pushstring 10; pushnum 20; arith -; return 1") == -10)
assert(T.testC("pushstring 10; pushstring -20; arith *; return 1") == -200)
assert(T.testC("pushstring 10; pushstring 3; arith ^; return 1") == 1000)
assert(T.testC("arith /; return 1", 2, 0) == 10.0/0)
a = T.testC("pushnum 10; pushint 3; arith \\; return 1")
assert(a == 3.0 and math.type(a) == "float")
a = T.testC("pushint 10; pushint 3; arith \\; return 1")
assert(a == 3 and math.type(a) == "integer")
a = assert(T.testC("pushint 10; pushint 3; arith +; return 1"))
assert(a == 13 and math.type(a) == "integer")
a = assert(T.testC("pushnum 10; pushint 3; arith +; return 1"))
assert(a == 13 and math.type(a) == "float")
a,b,c = T.testC([[pushnum 1;
pushstring 10; arith _;
pushstring 5; return 3]])
assert(a == 1 and b == -10 and c == "5")
local mt = {
__add = function (a,b) return setmetatable({a[1] + b[1]}, mt) end,
__mod = function (a,b) return setmetatable({a[1] % b[1]}, mt) end,
__unm = function (a) return setmetatable({a[1]* 2}, mt) end}
a,b,c = setmetatable({4}, mt),
setmetatable({8}, mt),
setmetatable({-3}, mt)
local x,y,z = T.testC("arith +; return 2", 10, a, b)
assert(x == 10 and y[1] == 12 and z == nil)
assert(T.testC("arith %; return 1", a, c)[1] == 4%-3)
assert(T.testC("arith _; arith +; arith %; return 1", b, a, c)[1] ==
8 % (4 + (-3)*2))
-- errors in arithmetic
checkerr("divide by zero", T.testC, "arith \\", 10, 0)
checkerr("%%0", T.testC, "arith %", 10, 0)
-- testing lessthan and lessequal
assert(T.testC("compare LT 2 5, return 1", 3, 2, 2, 4, 2, 2))
assert(T.testC("compare LE 2 5, return 1", 3, 2, 2, 4, 2, 2))
assert(not T.testC("compare LT 3 4, return 1", 3, 2, 2, 4, 2, 2))
assert(T.testC("compare LE 3 4, return 1", 3, 2, 2, 4, 2, 2))
assert(T.testC("compare LT 5 2, return 1", 4, 2, 2, 3, 2, 2))
assert(not T.testC("compare LT 2 -3, return 1", "4", "2", "2", "3", "2", "2"))
assert(not T.testC("compare LT -3 2, return 1", "3", "2", "2", "4", "2", "2"))
-- non-valid indices produce false
assert(not T.testC("compare LT 1 4, return 1"))
assert(not T.testC("compare LE 9 1, return 1"))
assert(not T.testC("compare EQ 9 9, return 1"))
local b = {__lt = function (a,b) return a[1] < b[1] end}
local a1,a3,a4 = setmetatable({1}, b),
setmetatable({3}, b),
setmetatable({4}, b)
assert(T.testC("compare LT 2 5, return 1", a3, 2, 2, a4, 2, 2))
assert(T.testC("compare LE 2 5, return 1", a3, 2, 2, a4, 2, 2))
assert(T.testC("compare LT 5 -6, return 1", a4, 2, 2, a3, 2, 2))
a,b = T.testC("compare LT 5 -6, return 2", a1, 2, 2, a3, 2, 20)
assert(a == 20 and b == false)
a,b = T.testC("compare LE 5 -6, return 2", a1, 2, 2, a3, 2, 20)
assert(a == 20 and b == false)
a,b = T.testC("compare LE 5 -6, return 2", a1, 2, 2, a1, 2, 20)
assert(a == 20 and b == true)
do -- testing lessthan and lessequal with metamethods
local mt = {__lt = function (a,b) return a[1] < b[1] end,
__le = function (a,b) return a[1] <= b[1] end,
__eq = function (a,b) return a[1] == b[1] end}
local function O (x)
return setmetatable({x}, mt)
end
local a, b = T.testC("compare LT 2 3; pushint 10; return 2", O(1), O(2))
assert(a == true and b == 10)
local a, b = T.testC("compare LE 2 3; pushint 10; return 2", O(3), O(2))
assert(a == false and b == 10)
local a, b = T.testC("compare EQ 2 3; pushint 10; return 2", O(3), O(3))
assert(a == true and b == 10)
end
-- testing length
local t = setmetatable({x = 20}, {__len = function (t) return t.x end})
a,b,c = T.testC([[
len 2;
Llen 2;
objsize 2;
return 3
]], t)
assert(a == 20 and b == 20 and c == 0)
t.x = "234"; t[1] = 20
a,b,c = T.testC([[
len 2;
Llen 2;
objsize 2;
return 3
]], t)
assert(a == "234" and b == 234 and c == 1)
t.x = print; t[1] = 20
a,c = T.testC([[
len 2;
objsize 2;
return 2
]], t)
assert(a == print and c == 1)
-- testing __concat
a = setmetatable({x="u"}, {__concat = function (a,b) return a.x..'.'..b.x end})
x,y = T.testC([[
pushnum 5
pushvalue 2;
pushvalue 2;
concat 2;
pushvalue -2;
return 2;
]], a, a)
assert(x == a..a and y == 5)
-- concat with 0 elements
assert(T.testC("concat 0; return 1") == "")
-- concat with 1 element
assert(T.testC("concat 1; return 1", "xuxu") == "xuxu")
-- testing lua_is
local function B (x) return x and 1 or 0 end
local function count (x, n)
n = n or 2
local prog = [[
isnumber %d;
isstring %d;
isfunction %d;
iscfunction %d;
istable %d;
isuserdata %d;
isnil %d;
isnull %d;
return 8
]]
prog = string.format(prog, n, n, n, n, n, n, n, n)
local a,b,c,d,e,f,g,h = T.testC(prog, x)
return B(a)+B(b)+B(c)+B(d)+B(e)+B(f)+B(g)+(100*B(h))
end
assert(count(3) == 2)
assert(count('alo') == 1)
assert(count('32') == 2)
assert(count({}) == 1)
assert(count(print) == 2)
assert(count(function () end) == 1)
assert(count(nil) == 1)
assert(count(io.stdin) == 1)
assert(count(nil, 15) == 100)
-- testing lua_to...
local function to (s, x, n)
n = n or 2
return T.testC(string.format("%s %d; return 1", s, n), x)
end
local null = T.pushuserdata(0)
local hfunc = string.gmatch("", "") -- a "heavy C function" (with upvalues)
assert(debug.getupvalue(hfunc, 1))
assert(to("tostring", {}) == nil)
assert(to("tostring", "alo") == "alo")
assert(to("tostring", 12) == "12")
assert(to("tostring", 12, 3) == nil)
assert(to("objsize", {}) == 0)
assert(to("objsize", {1,2,3}) == 3)
assert(to("objsize", "alo\0\0a") == 6)
assert(to("objsize", T.newuserdata(0)) == 0)
assert(to("objsize", T.newuserdata(101)) == 101)
assert(to("objsize", 124) == 0)
assert(to("objsize", true) == 0)
assert(to("tonumber", {}) == 0)
assert(to("tonumber", "12") == 12)
assert(to("tonumber", "s2") == 0)
assert(to("tonumber", 1, 20) == 0)
assert(to("topointer", 10) == null)
assert(to("topointer", true) == null)
assert(to("topointer", nil) == null)
assert(to("topointer", "abc") ~= null)
assert(to("topointer", string.rep("x", 10)) ==
to("topointer", string.rep("x", 10))) -- short strings
do -- long strings
local s1 = string.rep("x", 300)
local s2 = string.rep("x", 300)
assert(to("topointer", s1) ~= to("topointer", s2))
end
assert(to("topointer", T.pushuserdata(20)) ~= null)
assert(to("topointer", io.read) ~= null) -- light C function
assert(to("topointer", hfunc) ~= null) -- "heavy" C function
assert(to("topointer", function () end) ~= null) -- Lua function
assert(to("topointer", io.stdin) ~= null) -- full userdata
assert(to("func2num", 20) == 0)
assert(to("func2num", T.pushuserdata(10)) == 0)
assert(to("func2num", io.read) ~= 0) -- light C function
assert(to("func2num", hfunc) ~= 0) -- "heavy" C function (with upvalue)
a = to("tocfunction", math.deg)
assert(a(3) == math.deg(3) and a == math.deg)
print("testing panic function")
do
-- trivial error
assert(T.checkpanic("pushstring hi; error") == "hi")
-- using the stack inside panic
assert(T.checkpanic("pushstring hi; error;",
[[checkstack 5 XX
pushstring ' alo'
pushstring ' mundo'
concat 3]]) == "hi alo mundo")
-- "argerror" without frames
assert(T.checkpanic("loadstring 4 name bt") ==
"bad argument #4 (string expected, got no value)")
-- memory error
T.totalmem(T.totalmem()+10000) -- set low memory limit (+10k)
assert(T.checkpanic("newuserdata 20000") == MEMERRMSG)
T.totalmem(0) -- restore high limit
-- stack error
if not _soft then
local msg = T.checkpanic[[
pushstring "function f() f() end"
loadstring -1 name t; call 0 0
getglobal f; call 0 0
]]
assert(string.find(msg, "stack overflow"))
end
-- exit in panic still close to-be-closed variables
assert(T.checkpanic([[
pushstring "return {__close = function () Y = 'ho'; end}"
newtable
loadstring -2 name t
call 0 1
setmetatable -2
toclose -1
pushstring "hi"
error
]],
[[
getglobal Y
concat 2 # concat original error with global Y
]]) == "hiho")
end
-- testing deep C stack
if not _soft then
print("testing stack overflow")
collectgarbage("stop")
checkerr("XXXX", T.testC, "checkstack 1000023 XXXX") -- too deep
-- too deep (with no message)
checkerr("^stack overflow$", T.testC, "checkstack 1000023 ''")
local s = string.rep("pushnil;checkstack 1 XX;", 1000000)
checkerr("overflow", T.testC, s)
collectgarbage("restart")
print'+'
end
local lim = _soft and 500 or 12000
local prog = {"checkstack " .. (lim * 2 + 100) .. "msg", "newtable"}
for i = 1,lim do
prog[#prog + 1] = "pushnum " .. i
prog[#prog + 1] = "pushnum " .. i * 10
end
prog[#prog + 1] = "rawgeti R !G" -- get global table in registry
prog[#prog + 1] = "insert " .. -(2*lim + 2)
for i = 1,lim do
prog[#prog + 1] = "settable " .. -(2*(lim - i + 1) + 1)
end
prog[#prog + 1] = "return 2"
prog = table.concat(prog, ";")
local g, t = T.testC(prog)
assert(g == _G)
for i = 1,lim do assert(t[i] == i*10); t[i] = undef end
assert(next(t) == nil)
prog, g, t = nil
do -- shrink stack
local m1, m2 = 0, collectgarbage"count" * 1024
while m1 ~= m2 do -- repeat until stable
collectgarbage()
m1 = m2
m2 = collectgarbage"count" * 1024
end
end
-- testing errors
a = T.testC([[
loadstring 2 name t; pcall 0 1 0;
pushvalue 3; insert -2; pcall 1 1 0;
pcall 0 0 0;
return 1
]], "XX=150", function (a) assert(a==nil); return 3 end)
assert(type(a) == 'string' and XX == 150)
_G.XX = nil
local function check3(p, ...)
local arg = {...}
assert(#arg == 3)
assert(string.find(arg[3], p))
end
check3(":1:", T.testC("loadstring 2 name t; return *", "x="))
check3("%.", T.testC("loadfile 2; return *", "."))
check3("xxxx", T.testC("loadfile 2; return *", "xxxx"))
-- test errors in non protected threads
local function checkerrnopro (code, msg)
local th = coroutine.create(function () end) -- create new thread
local stt, err = pcall(T.testC, th, code) -- run code there
assert(not stt and string.find(err, msg))
end
do
print("testing load of binaries in fixed buffers")
local source = {}
local N = 1000
-- create a somewhat "large" source
for i = 1, N do source[i] = "X = X + 1; " end
-- add a long string to the source
source[#source + 1] = string.format("Y = '%s'", string.rep("a", N));
source = table.concat(source)
-- give chunk an explicit name to avoid using source as name
source = load(source, "name1")
-- dump without debug information
source = string.dump(source, true)
-- each "X=X+1" generates 4 opcodes with 4 bytes each, plus the string
assert(#source > N * 4 * 4 + N)
collectgarbage(); collectgarbage()
local m1 = collectgarbage"count" * 1024
-- load dump using fixed buffer
local code = T.testC([[
loadstring 2 name B;
return 1
]], source)
collectgarbage()
local m2 = collectgarbage"count" * 1024
-- load used fewer than 400 bytes. Code alone has more than 3*N bytes,
-- and string literal has N bytes. Both were not loaded.
assert(m2 > m1 and m2 - m1 < 400)
X = 0; code(); assert(X == N and Y == string.rep("a", N))
X = nil; Y = nil
-- testing debug info in fixed buffers
source = {"X = 0"}
for i = 2, 300 do source[i] = "X = X + 1" end
source[#source + 1] = "X = X + {}" -- error in last line
source = table.concat(source, "\n")
source = load(source, "name1")
source = string.dump(source)
-- load dump using fixed buffer
local code = T.testC([[
loadstring 2 name B;
return 1
]], source)
checkerr(":301:", code) -- correct line information
end
if not _soft then
collectgarbage("stop") -- avoid __gc with full stack
checkerrnopro("pushnum 3; call 0 0", "attempt to call")
print"testing stack overflow in unprotected thread"
function F () F() end
checkerrnopro("getglobal 'F'; call 0 0;", "stack overflow")
F = nil
collectgarbage("restart")
end
print"+"
-- testing table access
do -- getp/setp
local a = {}
local a1 = T.testC("rawsetp 2 1; return 1", a, 20)
assert(a == a1)
assert(a[T.pushuserdata(1)] == 20)
local a1, res = T.testC("rawgetp -1 1; return 2", a)
assert(a == a1 and res == 20)
end
do -- using the table itself as index
local a = {}
a[a] = 10
local prog = "gettable -1; return *"
local res = {T.testC(prog, a)}
assert(#res == 2 and res[1] == prog and res[2] == 10)
local prog = "settable -2; return *"
local res = {T.testC(prog, a, 20)}
assert(a[a] == 20)
assert(#res == 1 and res[1] == prog)
-- raw
a[a] = 10
local prog = "rawget -1; return *"
local res = {T.testC(prog, a)}
assert(#res == 2 and res[1] == prog and res[2] == 10)
local prog = "rawset -2; return *"
local res = {T.testC(prog, a, 20)}
assert(a[a] == 20)
assert(#res == 1 and res[1] == prog)
-- using the table as the value to set
local prog = "rawset -1; return *"
local res = {T.testC(prog, 30, a)}
assert(a[30] == a)
assert(#res == 1 and res[1] == prog)
local prog = "settable -1; return *"
local res = {T.testC(prog, 40, a)}
assert(a[40] == a)
assert(#res == 1 and res[1] == prog)
local prog = "rawseti -1 100; return *"
local res = {T.testC(prog, a)}
assert(a[100] == a)
assert(#res == 1 and res[1] == prog)
local prog = "seti -1 200; return *"
local res = {T.testC(prog, a)}
assert(a[200] == a)
assert(#res == 1 and res[1] == prog)
end
a = {x=0, y=12}
x, y = T.testC("gettable 2; pushvalue 4; gettable 2; return 2",
a, 3, "y", 4, "x")
assert(x == 0 and y == 12)
T.testC("settable -5", a, 3, 4, "x", 15)
assert(a.x == 15)
a[a] = print
x = T.testC("gettable 2; return 1", a) -- table and key are the same object!
assert(x == print)
T.testC("settable 2", a, "x") -- table and key are the same object!
assert(a[a] == "x")
b = setmetatable({p = a}, {})
getmetatable(b).__index = function (t, i) return t.p[i] end
local k, x = T.testC("gettable 3, return 2", 4, b, 20, 35, "x")
assert(x == 15 and k == 35)
k = T.testC("getfield 2 y, return 1", b)
assert(k == 12)
getmetatable(b).__index = function (t, i) return a[i] end
getmetatable(b).__newindex = function (t, i,v ) a[i] = v end
y = T.testC("insert 2; gettable -5; return 1", 2, 3, 4, "y", b)
assert(y == 12)
k = T.testC("settable -5, return 1", b, 3, 4, "x", 16)
assert(a.x == 16 and k == 4)
a[b] = 'xuxu'
y = T.testC("gettable 2, return 1", b)
assert(y == 'xuxu')
T.testC("settable 2", b, 19)
assert(a[b] == 19)
--
do -- testing getfield/setfield with long keys
local t = {_012345678901234567890123456789012345678901234567890123456789 = 32}
local a = T.testC([[
getfield 2 _012345678901234567890123456789012345678901234567890123456789
return 1
]], t)
assert(a == 32)
local a = T.testC([[
pushnum 33
setglobal _012345678901234567890123456789012345678901234567890123456789
]])
assert(_012345678901234567890123456789012345678901234567890123456789 == 33)
_012345678901234567890123456789012345678901234567890123456789 = nil
end
-- testing next
a = {}
t = pack(T.testC("next; return *", a, nil))
tcheck(t, {n=1,a})
a = {a=3}
t = pack(T.testC("next; return *", a, nil))
tcheck(t, {n=3,a,'a',3})
t = pack(T.testC("next; pop 1; next; return *", a, nil))
tcheck(t, {n=1,a})
-- testing upvalues
do
local A = T.testC[[ pushnum 10; pushnum 20; pushcclosure 2; return 1]]
t, b, c = A([[pushvalue U0; pushvalue U1; pushvalue U2; return 3]])
assert(b == 10 and c == 20 and type(t) == 'table')
a, b = A([[tostring U3; tonumber U4; return 2]])
assert(a == nil and b == 0)
A([[pushnum 100; pushnum 200; replace U2; replace U1]])
b, c = A([[pushvalue U1; pushvalue U2; return 2]])
assert(b == 100 and c == 200)
A([[replace U2; replace U1]], {x=1}, {x=2})
b, c = A([[pushvalue U1; pushvalue U2; return 2]])
assert(b.x == 1 and c.x == 2)
T.checkmemory()
end
-- testing absent upvalues from C-function pointers
assert(T.testC[[isnull U1; return 1]] == true)
assert(T.testC[[isnull U100; return 1]] == true)
assert(T.testC[[pushvalue U1; return 1]] == nil)
local f = T.testC[[ pushnum 10; pushnum 20; pushcclosure 2; return 1]]
assert(T.upvalue(f, 1) == 10 and
T.upvalue(f, 2) == 20 and
T.upvalue(f, 3) == nil)
T.upvalue(f, 2, "xuxu")
assert(T.upvalue(f, 2) == "xuxu")
-- large closures
do
local A = "checkstack 300 msg;" ..
string.rep("pushnum 10;", 255) ..
"pushcclosure 255; return 1"
A = T.testC(A)
for i=1,255 do
assert(A(("pushvalue U%d; return 1"):format(i)) == 10)
end
assert(A("isnull U256; return 1"))
assert(not A("isnil U256; return 1"))
end
-- testing get/setuservalue
-- bug in 5.1.2
checkerr("got number", debug.setuservalue, 3, {})
checkerr("got nil", debug.setuservalue, nil, {})
checkerr("got light userdata", debug.setuservalue, T.pushuserdata(1), {})
-- testing multiple user values
local b = T.newuserdata(0, 10)
for i = 1, 10 do
local v, p = debug.getuservalue(b, i)
assert(v == nil and p)
end
do -- indices out of range
local v, p = debug.getuservalue(b, -2)
assert(v == nil and not p)
local v, p = debug.getuservalue(b, 11)
assert(v == nil and not p)
end
local t = {true, false, 4.56, print, {}, b, "XYZ"}
for k, v in ipairs(t) do
debug.setuservalue(b, v, k)
end
for k, v in ipairs(t) do
local v1, p = debug.getuservalue(b, k)
assert(v1 == v and p)
end
assert(not debug.getuservalue(4))
debug.setuservalue(b, function () return 10 end, 10)
collectgarbage() -- function should not be collected
assert(debug.getuservalue(b, 10)() == 10)
debug.setuservalue(b, 134)
collectgarbage() -- number should not be a problem for collector
assert(debug.getuservalue(b) == 134)
-- test barrier for uservalues
do
local oldmode = collectgarbage("incremental")
T.gcstate("atomic")
assert(T.gccolor(b) == "black")
debug.setuservalue(b, {x = 100})
T.gcstate("pause") -- complete collection
assert(debug.getuservalue(b).x == 100) -- uvalue should be there
collectgarbage(oldmode)
end
-- long chain of userdata
for i = 1, 1000 do
local bb = T.newuserdata(0, 1)
debug.setuservalue(bb, b)
b = bb
end
collectgarbage() -- nothing should not be collected
for i = 1, 1000 do
b = debug.getuservalue(b)
end
assert(debug.getuservalue(b).x == 100)
b = nil
-- testing locks (refs)
-- reuse of references
local i = T.ref{}
T.unref(i)
assert(T.ref{} == i)
local Arr = {}
local Lim = 100
for i=1,Lim do -- lock many objects
Arr[i] = T.ref({})
end
assert(T.ref(nil) == -1 and T.getref(-1) == nil)
T.unref(-1); T.unref(-1)
for i=1,Lim do -- unlock all them
T.unref(Arr[i])
end
local function printlocks ()
local f = T.makeCfunc("gettable R; return 1")
local n = f("n")
print("n", n)
for i=0,n do
print(i, f(i))
end
end
for i=1,Lim do -- lock many objects
Arr[i] = T.ref({})
end
for i=1,Lim,2 do -- unlock half of them
T.unref(Arr[i])
end
assert(type(T.getref(Arr[2])) == 'table')
assert(T.getref(-1) == nil)
a = T.ref({})
collectgarbage()
assert(type(T.getref(a)) == 'table')
-- colect in cl the `val' of all collected userdata
local tt = {}
local cl = {n=0}
A = nil; B = nil
local F
F = function (x)
local udval = T.udataval(x)
table.insert(cl, udval)
local d = T.newuserdata(100) -- create garbage
d = nil
assert(debug.getmetatable(x).__gc == F)
assert(load("table.insert({}, {})"))() -- create more garbage
assert(not collectgarbage()) -- GC during GC (no op)
local dummy = {} -- create more garbage during GC
if A ~= nil then
assert(type(A) == "userdata")
assert(T.udataval(A) == B)
debug.getmetatable(A) -- just access it
end
A = x -- ressurect userdata
B = udval
return 1,2,3
end
tt.__gc = F
-- test whether udate collection frees memory in the right time
do
collectgarbage();
collectgarbage();
local x = collectgarbage("count");
local a = T.newuserdata(5001)
assert(T.testC("objsize 2; return 1", a) == 5001)
assert(collectgarbage("count") >= x+4)
a = nil
collectgarbage();
assert(collectgarbage("count") <= x+1)
-- udata without finalizer
x = collectgarbage("count")
collectgarbage("stop")
for i=1,1000 do T.newuserdata(0) end
assert(collectgarbage("count") > x+10)
collectgarbage()
assert(collectgarbage("count") <= x+1)
-- udata with finalizer
collectgarbage()
x = collectgarbage("count")
collectgarbage("stop")
a = {__gc = function () end}
for i=1,1000 do debug.setmetatable(T.newuserdata(0), a) end
assert(collectgarbage("count") >= x+10)
collectgarbage() -- this collection only calls TM, without freeing memory
assert(collectgarbage("count") >= x+10)
collectgarbage() -- now frees memory
assert(collectgarbage("count") <= x+1)
collectgarbage("restart")
end
collectgarbage("stop")
-- create 3 userdatas with tag `tt'
a = T.newuserdata(0); debug.setmetatable(a, tt); local na = T.udataval(a)
b = T.newuserdata(0); debug.setmetatable(b, tt); local nb = T.udataval(b)
c = T.newuserdata(0); debug.setmetatable(c, tt); local nc = T.udataval(c)
-- create userdata without meta table
x = T.newuserdata(4)
y = T.newuserdata(0)
checkerr("FILE%* expected, got userdata", io.input, a)
checkerr("FILE%* expected, got userdata", io.input, x)
assert(debug.getmetatable(x) == nil and debug.getmetatable(y) == nil)
-- Test references in an arbitrary table
local reftable = {}
local d = T.ref(a, reftable);
local e = T.ref(b, reftable);
local f = T.ref(c, reftable);
t = {T.getref(d, reftable), T.getref(e, reftable), T.getref(f, reftable)}
assert(t[1] == a and t[2] == b and t[3] == c)
t=nil; a=nil; c=nil;
T.unref(e, reftable); T.unref(f, reftable)
collectgarbage()
-- check that unref objects have been collected
assert(#cl == 1 and cl[1] == nc)
x = T.getref(d, reftable)
assert(type(x) == 'userdata' and debug.getmetatable(x) == tt)
x =nil
tt.b = b -- create cycle
tt=nil -- frees tt for GC
A = nil
b = nil
T.unref(d, reftable);
local n5 = T.newuserdata(0)
debug.setmetatable(n5, {__gc=F})
n5 = T.udataval(n5)
collectgarbage()
assert(#cl == 4)
-- check order of collection
assert(cl[2] == n5 and cl[3] == nb and cl[4] == na)
-- reuse a reference in 'reftable'
T.unref(T.ref(23, reftable), reftable)
do -- check reftable
local count = 0
local i = 1
while reftable[i] ~= 0 do
i = reftable[i] -- traverse linked list of free references
count = count + 1
end
-- maximum number of simultaneously locked objects was 3
assert(count == 3 and #reftable == 3 + 1) -- +1 for reserved [1]
end
collectgarbage"restart"
a, na = {}, {}
for i=30,1,-1 do
a[i] = T.newuserdata(0)
debug.setmetatable(a[i], {__gc=F})
na[i] = T.udataval(a[i])
end
cl = {}
a = nil; collectgarbage()
assert(#cl == 30)
for i=1,30 do assert(cl[i] == na[i]) end
na = nil
for i=2,Lim,2 do -- unlock the other half
T.unref(Arr[i])
end
x = T.newuserdata(41); debug.setmetatable(x, {__gc=F})
assert(T.testC("objsize 2; return 1", x) == 41)
cl = {}
a = {[x] = 1}
x = T.udataval(x)
collectgarbage()
-- old `x' cannot be collected (`a' still uses it)
assert(#cl == 0)
for n in pairs(a) do a[n] = undef end
collectgarbage()
assert(#cl == 1 and cl[1] == x) -- old `x' must be collected
-- testing lua_equal
assert(T.testC("compare EQ 2 4; return 1", print, 1, print, 20))
assert(T.testC("compare EQ 3 2; return 1", 'alo', "alo"))
assert(T.testC("compare EQ 2 3; return 1", nil, nil))
assert(not T.testC("compare EQ 2 3; return 1", {}, {}))
assert(not T.testC("compare EQ 2 3; return 1"))
assert(not T.testC("compare EQ 2 3; return 1", 3))
-- testing lua_equal with fallbacks
do
local map = {}
local t = {__eq = function (a,b) return map[a] == map[b] end}
local function f(x)
local u = T.newuserdata(0)
debug.setmetatable(u, t)
map[u] = x
return u
end
assert(f(10) == f(10))
assert(f(10) ~= f(11))
assert(T.testC("compare EQ 2 3; return 1", f(10), f(10)))
assert(not T.testC("compare EQ 2 3; return 1", f(10), f(20)))
t.__eq = nil
assert(f(10) ~= f(10))
end
print'+'
-- testing changing hooks during hooks
_G.TT = {}
T.sethook([[
# set a line hook after 3 count hooks
sethook 4 0 '
getglobal TT;
pushvalue -3; append -2
pushvalue -2; append -2
']], "c", 3)
local a = 1 -- counting
a = 1 -- counting
a = 1 -- count hook (set line hook)
a = 1 -- line hook
a = 1 -- line hook
debug.sethook()
local t = _G.TT
assert(t[1] == "line")
local line = t[2]
assert(t[3] == "line" and t[4] == line + 1)
assert(t[5] == "line" and t[6] == line + 2)
assert(t[7] == nil)
_G.TT = nil
-------------------------------------------------------------------------
do -- testing errors during GC
warn("@off")
collectgarbage("stop")
local a = {}
for i=1,20 do
a[i] = T.newuserdata(i) -- creates several udata
end
for i=1,20,2 do -- mark half of them to raise errors during GC
debug.setmetatable(a[i],
{__gc = function (x) error("@expected error in gc") end})
end
for i=2,20,2 do -- mark the other half to count and to create more garbage
debug.setmetatable(a[i], {__gc = function (x) load("A=A+1")() end})
end
a = nil
_G.A = 0
collectgarbage()
assert(A == 10) -- number of normal collections
collectgarbage("restart")
warn("@on")
end
_G.A = nil
-------------------------------------------------------------------------
-- test for userdata vals
do
local a = {}; local lim = 30
for i=0,lim do a[i] = T.pushuserdata(i) end
for i=0,lim do assert(T.udataval(a[i]) == i) end
for i=0,lim do assert(T.pushuserdata(i) == a[i]) end
for i=0,lim do a[a[i]] = i end
for i=0,lim do a[T.pushuserdata(i)] = i end
assert(type(tostring(a[1])) == "string")
end
-------------------------------------------------------------------------
-- testing multiple states
T.closestate(T.newstate());
L1 = T.newstate()
assert(L1)
assert(T.doremote(L1, "X='a'; return 'a'") == 'a')
assert(#pack(T.doremote(L1, "function f () return 'alo', 3 end; f()")) == 0)
a, b = T.doremote(L1, "return f()")
assert(a == 'alo' and b == '3')
T.doremote(L1, "_ERRORMESSAGE = nil")
-- error: `sin' is not defined
a, b, c = T.doremote(L1, "return sin(1)")
assert(a == nil and c == 2) -- 2 == run-time error
-- error: syntax error
a, b, c = T.doremote(L1, "return a+")
assert(a == nil and c == 3 and type(b) == "string") -- 3 == syntax error
T.loadlib(L1, 2, ~2) -- load only 'package', preload all others
a, b, c = T.doremote(L1, [[
string = require'string'
local initialG = _G -- not loaded yet
local a = require'_G'; assert(a == _G and require("_G") == a)
assert(initialG == nil and io == nil) -- now we have 'assert'
io = require'io'; assert(type(io.read) == "function")
assert(require("io") == io)
a = require'table'; assert(type(a.insert) == "function")
a = require'debug'; assert(type(a.getlocal) == "function")
a = require'math'; assert(type(a.sin) == "function")
return string.sub('okinama', 1, 2)
]])
assert(a == "ok")
T.closestate(L1);
L1 = T.newstate()
T.loadlib(L1, 0, 0)
T.doremote(L1, "a = {}")
T.testC(L1, [[getglobal "a"; pushstring "x"; pushint 1;
settable -3]])
assert(T.doremote(L1, "return a.x") == "1")
T.closestate(L1)
L1 = nil
print('+')
-------------------------------------------------------------------------
-- testing to-be-closed variables
-------------------------------------------------------------------------
print"testing to-be-closed variables"
do
local openresource = {}
local function newresource ()
local x = setmetatable({10}, {__close = function(y)
assert(openresource[#openresource] == y)
openresource[#openresource] = nil
y[1] = y[1] + 1
end})
openresource[#openresource + 1] = x
return x
end
local a, b = T.testC([[
call 0 1 # create resource
pushnil
toclose -2 # mark call result to be closed
toclose -1 # mark nil to be closed (will be ignored)
return 2
]], newresource)
assert(a[1] == 11 and b == nil)
assert(#openresource == 0) -- was closed
-- repeat the test, but calling function in a 'multret' context
local a = {T.testC([[
call 0 1 # create resource
toclose 2 # mark it to be closed
return 2
]], newresource)}
assert(type(a[1]) == "string" and a[2][1] == 11)
assert(#openresource == 0) -- was closed
-- closing by error
local a, b = pcall(T.makeCfunc[[
call 0 1 # create resource
toclose -1 # mark it to be closed
pushvalue -1 # replicate it as error object
error # resource right after error object
]], newresource)
assert(a == false and b[1] == 11)
assert(#openresource == 0) -- was closed
-- non-closable value
local a, b = pcall(T.makeCfunc[[
newtable # create non-closable object
toclose -1 # mark it to be closed (should raise an error)
abort # will not be executed
]])
assert(a == false and
string.find(b, "non%-closable value"))
local function check (n)
assert(#openresource == n)
end
-- closing resources with 'closeslot'
_ENV.xxx = true
local a = T.testC([[
pushvalue 2 # stack: S, NR, CH, NR
call 0 1 # create resource; stack: S, NR, CH, R
toclose -1 # mark it to be closed
pushvalue 2 # stack: S, NR, CH, R, NR
call 0 1 # create another resource; stack: S, NR, CH, R, R
toclose -1 # mark it to be closed
pushvalue 3 # stack: S, NR, CH, R, R, CH
pushint 2 # there should be two open resources
call 1 0 # stack: S, NR, CH, R, R
closeslot -1 # close second resource
pushvalue 3 # stack: S, NR, CH, R, R, CH
pushint 1 # there should be one open resource
call 1 0 # stack: S, NR, CH, R, R
closeslot 4
setglobal "xxx" # previous op. erased the slot
pop 1 # pop other resource from the stack
pushint *
return 1 # return stack size
]], newresource, check)
assert(a == 3 and _ENV.xxx == nil) -- no extra items left in the stack
-- closing resources with 'pop'
local a = T.testC([[
pushvalue 2 # stack: S, NR, CH, NR
call 0 1 # create resource; stack: S, NR, CH, R
toclose -1 # mark it to be closed
pushvalue 2 # stack: S, NR, CH, R, NR
call 0 1 # create another resource; stack: S, NR, CH, R, R
toclose -1 # mark it to be closed
pushvalue 3 # stack: S, NR, CH, R, R, CH
pushint 2 # there should be two open resources
call 1 0 # stack: S, NR, CH, R, R
pop 1 # pop second resource
pushvalue 3 # stack: S, NR, CH, R, CH
pushint 1 # there should be one open resource
call 1 0 # stack: S, NR, CH, R
pop 1 # pop other resource from the stack
pushvalue 3 # stack: S, NR, CH, CH
pushint 0 # there should be no open resources
call 1 0 # stack: S, NR, CH
pushint *
return 1 # return stack size
]], newresource, check)
assert(a == 3) -- no extra items left in the stack
-- non-closable value
local a, b = pcall(T.makeCfunc[[
pushint 32
toclose -1
]])
assert(not a and string.find(b, "(C temporary)"))
end
--[[
** {==================================================================
** Testing memory limits
** ===================================================================
--]]
print("memory-allocation errors")
checkerr("block too big", T.newuserdata, math.maxinteger)
collectgarbage()
local f = load"local a={}; for i=1,100000 do a[i]=i end"
T.alloccount(10)
checkerr(MEMERRMSG, f)
T.alloccount() -- remove limit
-- test memory errors; increase limit for maximum memory by steps,
-- o that we get memory errors in all allocations of a given
-- task, until there is enough memory to complete the task without
-- errors.
local function testbytes (s, f)
collectgarbage()
local M = T.totalmem()
local oldM = M
local a,b = nil
while true do
collectgarbage(); collectgarbage()
T.totalmem(M)
a, b = T.testC("pcall 0 1 0; pushstatus; return 2", f)
T.totalmem(0) -- remove limit
if a and b == "OK" then break end -- stop when no more errors
if b ~= "OK" and b ~= MEMERRMSG then -- not a memory error?
error(a, 0) -- propagate it
end
M = M + 7 -- increase memory limit
end
print(string.format("minimum memory for %s: %d bytes", s, M - oldM))
return a
end
-- test memory errors; increase limit for number of allocations one
-- by one, so that we get memory errors in all allocations of a given
-- task, until there is enough allocations to complete the task without
-- errors.
local function testalloc (s, f)
collectgarbage()
local M = 0
local a,b = nil
while true do
collectgarbage(); collectgarbage()
T.alloccount(M)
a, b = T.testC("pcall 0 1 0; pushstatus; return 2", f)
T.alloccount() -- remove limit
if a and b == "OK" then break end -- stop when no more errors
if b ~= "OK" and b ~= MEMERRMSG then -- not a memory error?
error(a, 0) -- propagate it
end
M = M + 1 -- increase allocation limit
end
print(string.format("minimum allocations for %s: %d allocations", s, M))
return a
end
local function testamem (s, f)
testalloc(s, f)
return testbytes(s, f)
end
-- doing nothing
b = testamem("doing nothing", function () return 10 end)
assert(b == 10)
-- testing memory errors when creating a new state
testamem("state creation", function ()
local st = T.newstate()
if st then T.closestate(st) end -- close new state
return st
end)
testamem("empty-table creation", function ()
return {}
end)
testamem("string creation", function ()
return "XXX" .. "YYY"
end)
testamem("coroutine creation", function()
return coroutine.create(print)
end)
-- testing to-be-closed variables
testamem("to-be-closed variables", function()
local flag
do
local x <close> =
setmetatable({}, {__close = function () flag = true end})
flag = false
local x = {}
end
return flag
end)
-- testing threads
-- get main thread from registry
local mt = T.testC("rawgeti R !M; return 1")
assert(type(mt) == "thread" and coroutine.running() == mt)
local function expand (n,s)
if n==0 then return "" end
local e = string.rep("=", n)
return string.format("T.doonnewstack([%s[ %s;\n collectgarbage(); %s]%s])\n",
e, s, expand(n-1,s), e)
end
G=0; collectgarbage(); a =collectgarbage("count")
load(expand(20,"G=G+1"))()
assert(G==20); collectgarbage(); -- assert(gcinfo() <= a+1)
G = nil
testamem("running code on new thread", function ()
return T.doonnewstack("local x=1") == 0 -- try to create thread
end)
-- testing memory x compiler
testamem("loadstring", function ()
return load("x=1") -- try to do load a string
end)
local testprog = [[
local function foo () return end
local t = {"x"}
AA = "aaa"
for i = 1, #t do AA = AA .. t[i] end
return true
]]
-- testing memory x dofile
_G.AA = nil
local t =os.tmpname()
local f = assert(io.open(t, "w"))
f:write(testprog)
f:close()
testamem("dofile", function ()
local a = loadfile(t)
return a and a()
end)
assert(os.remove(t))
assert(_G.AA == "aaax")
-- other generic tests
testamem("gsub", function ()
local a, b = string.gsub("alo alo", "(a)", function (x) return x..'b' end)
return (a == 'ablo ablo')
end)
testamem("dump/undump", function ()
local a = load(testprog)
local b = a and string.dump(a)
a = b and load(b)
return a and a()
end)
_G.AA = nil
local t = os.tmpname()
testamem("file creation", function ()
local f = assert(io.open(t, 'w'))
assert (not io.open"nomenaoexistente")
io.close(f);
return not loadfile'nomenaoexistente'
end)
assert(os.remove(t))
testamem("table creation", function ()
local a, lim = {}, 10
for i=1,lim do a[i] = i; a[i..'a'] = {} end
return (type(a[lim..'a']) == 'table' and a[lim] == lim)
end)
testamem("constructors", function ()
local a = {10, 20, 30, 40, 50; a=1, b=2, c=3, d=4, e=5}
return (type(a) == 'table' and a.e == 5)
end)
local a = 1
local close = nil
testamem("closure creation", function ()
function close (b)
return function (x) return b + x end
end
return (close(2)(4) == 6)
end)
testamem("using coroutines", function ()
local a = coroutine.wrap(function ()
coroutine.yield(string.rep("a", 10))
return {}
end)
assert(string.len(a()) == 10)
return a()
end)
do -- auxiliary buffer
local lim = 100
local a = {}; for i = 1, lim do a[i] = "01234567890123456789" end
testamem("auxiliary buffer", function ()
return (#table.concat(a, ",") == 20*lim + lim - 1)
end)
end
testamem("growing stack", function ()
local function foo (n)
if n == 0 then return 1 else return 1 + foo(n - 1) end
end
return foo(100)
end)
-- }==================================================================
do -- testing failing in 'lua_checkstack'
local res = T.testC([[rawcheckstack 500000; return 1]])
assert(res == false)
local L = T.newstate()
T.alloccount(0) -- will be unable to reallocate the stack
res = T.testC(L, [[rawcheckstack 5000; return 1]])
T.alloccount()
T.closestate(L)
assert(res == false)
end
do -- closing state with no extra memory
local L = T.newstate()
T.alloccount(0)
T.closestate(L)
T.alloccount()
end
do -- garbage collection with no extra memory
local L = T.newstate()
T.loadlib(L, 1 | 2, 0) -- load _G and 'package'
local res = (T.doremote(L, [[
_ENV = _G
assert(string == nil)
local a = {}
for i = 1, 1000 do a[i] = 'i' .. i end -- grow string table
local stsize, stuse = T.querystr()
assert(stuse > 1000)
local function foo (n)
if n > 0 then foo(n - 1) end
end
foo(180) -- grow stack
local _, stksize = T.stacklevel()
assert(stksize > 180)
a = nil
T.alloccount(0)
collectgarbage()
T.alloccount()
-- stack and string table could not be reallocated,
-- so they kept their sizes (without errors)
assert(select(2, T.stacklevel()) == stksize)
assert(T.querystr() == stsize)
return 'ok'
]]))
assert(res == 'ok')
T.closestate(L)
end
print'+'
-- testing some auxlib functions
local function gsub (a, b, c)
a, b = T.testC("gsub 2 3 4; gettop; return 2", a, b, c)
assert(b == 5)
return a
end
assert(gsub("alo.alo.uhuh.", ".", "//") == "alo//alo//uhuh//")
assert(gsub("alo.alo.uhuh.", "alo", "//") == "//.//.uhuh.")
assert(gsub("", "alo", "//") == "")
assert(gsub("...", ".", "/.") == "/././.")
assert(gsub("...", "...", "") == "")
-- testing luaL_newmetatable
local mt_xuxu, res, top = T.testC("newmetatable xuxu; gettop; return 3")
assert(type(mt_xuxu) == "table" and res and top == 3)
local d, res, top = T.testC("newmetatable xuxu; gettop; return 3")
assert(mt_xuxu == d and not res and top == 3)
d, res, top = T.testC("newmetatable xuxu1; gettop; return 3")
assert(mt_xuxu ~= d and res and top == 3)
x = T.newuserdata(0);
y = T.newuserdata(0);
T.testC("pushstring xuxu; gettable R; setmetatable 2", x)
assert(getmetatable(x) == mt_xuxu)
-- testing luaL_testudata
-- correct metatable
local res1, res2, top = T.testC([[testudata -1 xuxu
testudata 2 xuxu
gettop
return 3]], x)
assert(res1 and res2 and top == 4)
-- wrong metatable
res1, res2, top = T.testC([[testudata -1 xuxu1
testudata 2 xuxu1
gettop
return 3]], x)
assert(not res1 and not res2 and top == 4)
-- non-existent type
res1, res2, top = T.testC([[testudata -1 xuxu2
testudata 2 xuxu2
gettop
return 3]], x)
assert(not res1 and not res2 and top == 4)
-- userdata has no metatable
res1, res2, top = T.testC([[testudata -1 xuxu
testudata 2 xuxu
gettop
return 3]], y)
assert(not res1 and not res2 and top == 4)
-- erase metatables
do
local r = debug.getregistry()
assert(r.xuxu == mt_xuxu and r.xuxu1 == d)
r.xuxu = nil; r.xuxu1 = nil
end
print'OK'
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