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dis-bench / src /lua /seeds /calls.lua
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-- $Id: testes/calls.lua $
-- See Copyright Notice in file lua.h
global <const> *
print("testing functions and calls")
local debug = require "debug"
-- get the opportunity to test 'type' too ;)
assert(type(1<2) == 'boolean')
assert(type(true) == 'boolean' and type(false) == 'boolean')
assert(type(nil) == 'nil'
and type(-3) == 'number'
and type'x' == 'string'
and type{} == 'table'
and type(type) == 'function')
assert(type(assert) == type(print))
local function f (x) return a:x (x) end
assert(type(f) == 'function')
assert(not pcall(type))
-- testing local-function recursion
global fact; fact = false
do
local res = 1
local function fact (n)
if n==0 then return res
else return n*fact(n-1)
end
end
assert(fact(5) == 120)
end
assert(fact == false)
fact = nil
-- testing declarations
local a = {i = 10}
local self = 20
function a:x (x) return x+self.i end
function a.y (x) return x+self end
assert(a:x(1)+10 == a.y(1))
a.t = {i=-100}
a["t"].x = function (self, a,b) return self.i+a+b end
assert(a.t:x(2,3) == -95)
do
local a = {x=0}
function a:add (x) self.x, a.y = self.x+x, 20; return self end
assert(a:add(10):add(20):add(30).x == 60 and a.y == 20)
end
local a = {b={c={}}}
function a.b.c.f1 (x) return x+1 end
function a.b.c:f2 (x,y) self[x] = y end
assert(a.b.c.f1(4) == 5)
a.b.c:f2('k', 12); assert(a.b.c.k == 12)
print('+')
global t; t = nil -- 'declare' t
function f(a,b,c) local d = 'a'; t={a,b,c,d} end
f( -- this line change must be valid
1,2)
assert(t[1] == 1 and t[2] == 2 and t[3] == nil and t[4] == 'a')
f(1,2, -- this one too
3,4)
assert(t[1] == 1 and t[2] == 2 and t[3] == 3 and t[4] == 'a')
t = nil -- delete 't'
global function fat(x)
if x <= 1 then return 1
else return x*load("return fat(" .. x-1 .. ")", "")()
end
end
assert(load "load 'assert(fat(6)==720)' () ")()
a = load('return fat(5), 3')
local a,b = a()
assert(a == 120 and b == 3)
fat = nil
print('+')
local function err_on_n (n)
if n==0 then error(); exit(1);
else err_on_n (n-1); exit(1);
end
end
do
local function dummy (n)
if n > 0 then
assert(not pcall(err_on_n, n))
dummy(n-1)
end
end
dummy(10)
end
_G.deep = nil -- "declaration" (used by 'all.lua')
global function deep (n)
if n>0 then deep(n-1) end
end
deep(10)
deep(180)
print"testing tail calls"
function deep (n) if n>0 then return deep(n-1) else return 101 end end
assert(deep(30000) == 101)
a = {}
function a:deep (n) if n>0 then return self:deep(n-1) else return 101 end end
assert(a:deep(30000) == 101)
do -- tail calls x varargs
local function foo (x, ...) local a = {...}; return x, a[1], a[2] end
local function foo1 (x) return foo(10, x, x + 1) end
local a, b, c = foo1(-2)
assert(a == 10 and b == -2 and c == -1)
-- tail calls x metamethods
local t = setmetatable({}, {__call = foo})
local function foo2 (x) return t(10, x) end
a, b, c = foo2(100)
assert(a == t and b == 10 and c == 100)
a, b = (function () return foo() end)()
assert(a == nil and b == nil)
local X, Y, A
local function foo (x, y, ...) X = x; Y = y; A = {...} end
local function foo1 (...) return foo(...) end
local a, b, c = foo1()
assert(X == nil and Y == nil and #A == 0)
a, b, c = foo1(10)
assert(X == 10 and Y == nil and #A == 0)
a, b, c = foo1(10, 20)
assert(X == 10 and Y == 20 and #A == 0)
a, b, c = foo1(10, 20, 30)
assert(X == 10 and Y == 20 and #A == 1 and A[1] == 30)
end
do -- C-stack overflow while handling C-stack overflow
local function loop ()
assert(pcall(loop))
end
local err, msg = xpcall(loop, loop)
assert(not err and string.find(msg, "error"))
end
do -- tail calls x chain of __call
local n = 10000 -- depth
local function foo ()
if n == 0 then return 1023
else n = n - 1; return foo()
end
end
-- build a chain of __call metamethods ending in function 'foo'
for i = 1, 15 do
foo = setmetatable({}, {__call = foo})
end
-- call the first one as a tail call in a new coroutine
-- (to ensure stack is not preallocated)
assert(coroutine.wrap(function() return foo() end)() == 1023)
end
print('+')
do print"testing chains of '__call'"
local N = 15
local u = table.pack
for i = 1, N do
u = setmetatable({i}, {__call = u})
end
local Res = u("a", "b", "c")
assert(Res.n == N + 3)
for i = 1, N do
assert(Res[i][1] == i)
end
assert(Res[N + 1] == "a" and Res[N + 2] == "b" and Res[N + 3] == "c")
local function u (...)
local n = debug.getinfo(1, 't').extraargs
assert(select("#", ...) == n)
return n
end
for i = 0, N do
assert(u() == i)
u = setmetatable({}, {__call = u})
end
end
do -- testing chains too long
local a = {}
for i = 1, 16 do -- one too many
a = setmetatable({}, {__call = a})
end
local status, msg = pcall(a)
assert(not status and string.find(msg, "too long"))
setmetatable(a, {__call = a}) -- infinite chain
local status, msg = pcall(a)
assert(not status and string.find(msg, "too long"))
-- again, with a tail call
local status, msg = pcall(function () return a() end)
assert(not status and string.find(msg, "too long"))
end
a = nil
(function (x) a=x end)(23)
assert(a == 23 and (function (x) return x*2 end)(20) == 40)
-- testing closures
-- fixed-point operator
local Z = function (le)
local function a (f)
return le(function (x) return f(f)(x) end)
end
return a(a)
end
-- non-recursive factorial
local F = function (f)
return function (n)
if n == 0 then return 1
else return n*f(n-1) end
end
end
local fat = Z(F)
assert(fat(0) == 1 and fat(4) == 24 and Z(F)(5)==5*Z(F)(4))
local function g (z)
local function f (a,b,c,d)
return function (x,y) return a+b+c+d+a+x+y+z end
end
return f(z,z+1,z+2,z+3)
end
local f = g(10)
assert(f(9, 16) == 10+11+12+13+10+9+16+10)
print('+')
-- testing multiple returns
local function unlpack (t, i)
i = i or 1
if (i <= #t) then
return t[i], unlpack(t, i+1)
end
end
local function equaltab (t1, t2)
assert(#t1 == #t2)
for i = 1, #t1 do
assert(t1[i] == t2[i])
end
end
local pack = function (...) return (table.pack(...)) end
local function f() return 1,2,30,4 end
local function ret2 (a,b) return a,b end
local a,b,c,d = unlpack{1,2,3}
assert(a==1 and b==2 and c==3 and d==nil)
a = {1,2,3,4,false,10,'alo',false,assert}
equaltab(pack(unlpack(a)), a)
equaltab(pack(unlpack(a), -1), {1,-1})
a,b,c,d = ret2(f()), ret2(f())
assert(a==1 and b==1 and c==2 and d==nil)
a,b,c,d = unlpack(pack(ret2(f()), ret2(f())))
assert(a==1 and b==1 and c==2 and d==nil)
a,b,c,d = unlpack(pack(ret2(f()), (ret2(f()))))
assert(a==1 and b==1 and c==nil and d==nil)
a = ret2{ unlpack{1,2,3}, unlpack{3,2,1}, unlpack{"a", "b"}}
assert(a[1] == 1 and a[2] == 3 and a[3] == "a" and a[4] == "b")
-- testing calls with 'incorrect' arguments
rawget({}, "x", 1)
rawset({}, "x", 1, 2)
assert(math.sin(1,2) == math.sin(1))
table.sort({10,9,8,4,19,23,0,0}, function (a,b) return a<b end, "extra arg")
-- test for generic load
local x = "-- a comment\0\0\0\n x = 10 + \n23; \
local a = function () x = 'hi' end; \
return '\0'"
local function read1 (x)
local i = 0
return function ()
collectgarbage()
i=i+1
return string.sub(x, i, i)
end
end
local function cannotload (msg, a,b)
assert(not a and string.find(b, msg))
end
a = assert(load(read1(x), "modname", "t", _G))
assert(a() == "\0" and _G.x == 33)
assert(debug.getinfo(a).source == "modname")
-- cannot read text in binary mode
cannotload("attempt to load a text chunk", load(read1(x), "modname", "b", {}))
cannotload("attempt to load a text chunk", load(x, "modname", "b"))
a = assert(load(function () return nil end))
a() -- empty chunk
assert(not load(function () return true end))
-- small bug
local t = {nil, "return ", "3"}
local f, msg = load(function () return table.remove(t, 1) end)
assert(f() == nil) -- should read the empty chunk
-- another small bug (in 5.2.1)
f = load(string.dump(function () return 1 end), nil, "b", {})
assert(type(f) == "function" and f() == 1)
do -- another bug (in 5.4.0)
-- loading a binary long string interrupted by GC cycles
local f = string.dump(function ()
return '01234567890123456789012345678901234567890123456789'
end)
f = load(read1(f))
assert(f() == '01234567890123456789012345678901234567890123456789')
end
x = string.dump(load("x = 1; return x"))
a = assert(load(read1(x), nil, "b"))
assert(a() == 1 and _G.x == 1)
cannotload("attempt to load a binary chunk", load(read1(x), nil, "t"))
cannotload("attempt to load a binary chunk", load(x, nil, "t"))
_G.x = nil
assert(not pcall(string.dump, print)) -- no dump of C functions
cannotload("unexpected symbol", load(read1("*a = 123")))
cannotload("unexpected symbol", load("*a = 123"))
cannotload("hhi", load(function () error("hhi") end))
-- any value is valid for _ENV
assert(load("return _ENV", nil, nil, 123)() == 123)
-- load when _ENV is not first upvalue
global XX; local x
XX = 123
local function h ()
local y=x -- use 'x', so that it becomes 1st upvalue
return XX -- global name
end
local d = string.dump(h)
x = load(d, "", "b")
assert(debug.getupvalue(x, 2) == '_ENV')
debug.setupvalue(x, 2, _G)
assert(x() == 123)
assert(assert(load("return XX + ...", nil, nil, {XX = 13}))(4) == 17)
XX = nil
-- test generic load with nested functions
x = [[
return function (x)
return function (y)
return function (z)
return x+y+z
end
end
end
]]
a = assert(load(read1(x), "read", "t"))
assert(a()(2)(3)(10) == 15)
-- repeat the test loading a binary chunk
x = string.dump(a)
a = assert(load(read1(x), "read", "b"))
assert(a()(2)(3)(10) == 15)
-- test for dump/undump with upvalues
local a, b = 20, 30
x = load(string.dump(function (x)
if x == "set" then a = 10+b; b = b+1 else
return a
end
end), "", "b", nil)
assert(x() == nil)
assert(debug.setupvalue(x, 1, "hi") == "a")
assert(x() == "hi")
assert(debug.setupvalue(x, 2, 13) == "b")
assert(not debug.setupvalue(x, 3, 10)) -- only 2 upvalues
x("set")
assert(x() == 23)
x("set")
assert(x() == 24)
-- test for dump/undump with many upvalues
do
local nup = 200 -- maximum number of local variables
local prog = {"local a1"}
for i = 2, nup do prog[#prog + 1] = ", a" .. i end
prog[#prog + 1] = " = 1"
for i = 2, nup do prog[#prog + 1] = ", " .. i end
local sum = 1
prog[#prog + 1] = "; return function () return a1"
for i = 2, nup do prog[#prog + 1] = " + a" .. i; sum = sum + i end
prog[#prog + 1] = " end"
prog = table.concat(prog)
local f = assert(load(prog))()
assert(f() == sum)
f = load(string.dump(f)) -- main chunk now has many upvalues
local a = 10
local h = function () return a end
for i = 1, nup do
debug.upvaluejoin(f, i, h, 1)
end
assert(f() == 10 * nup)
end
-- test for long method names
do
local t = {x = 1}
function t:_012345678901234567890123456789012345678901234567890123456789 ()
return self.x
end
assert(t:_012345678901234567890123456789012345678901234567890123456789() == 1)
end
-- test for bug in parameter adjustment
assert((function () return nil end)(4) == nil)
assert((function () local a; return a end)(4) == nil)
assert((function (a) return a end)() == nil)
print("testing binary chunks")
do
local headformat = "c4BBc6BiBI4BjBn"
local header = { -- header components
"\27Lua", -- signature
0x55, -- version 5.5 (0x55)
0, -- format
"\x19\x93\r\n\x1a\n", -- a binary string
string.packsize("i"), -- size of an int
-0x5678, -- an int
4, -- size of an instruction
0x12345678, -- an instruction (4 bytes)
string.packsize("j"), -- size of a Lua integer
-0x5678, -- a Lua integer
string.packsize("n"), -- size of a Lua float
-370.5, -- a Lua float
}
local c = string.dump(function ()
local a = 1; local b = 3;
local f = function () return a + b + _ENV.c; end -- upvalues
local s1 = "a constant"
local s2 = "another constant"
return a + b * 3
end)
assert(assert(load(c))() == 10)
-- check header
local t = {string.unpack(headformat, c)}
for i = 1, #header do
assert(t[i] == header[i])
end
-- Testing corrupted header.
-- A single wrong byte in the head invalidates the chunk,
-- except for the Lua float check. (If numbers are long double,
-- the representation may need padding, and changing that padding
-- will not invalidate the chunk.)
local headlen = string.packsize(headformat)
headlen = headlen - string.packsize("n") -- remove float check
for i = 1, headlen do
local s = string.sub(c, 1, i - 1) ..
string.char((string.byte(string.sub(c, i, i)) + 1) & 0xFF) ..
string.sub(c, i + 1, -1)
assert(#s == #c and s ~= c)
assert(not load(s))
end
-- loading truncated binary chunks
for i = 1, #c - 1 do
local st, msg = load(string.sub(c, 1, i))
assert(not st and string.find(msg, "truncated"))
end
end
do -- check reuse of strings in dumps
local str = "|" .. string.rep("X", 50) .. "|"
local foo = load(string.format([[
local str <const> = "%s"
return {
function () return str end,
function () return str end,
function () return str end
}
]], str))
-- count occurrences of 'str' inside the dump
local dump = string.dump(foo)
local _, count = string.gsub(dump, str, {})
-- there should be only two occurrences:
-- one inside the source, other the string itself.
assert(count == 2)
if T then -- check reuse of strings in undump
local funcs = load(dump)()
assert(string.format("%p", T.listk(funcs[1])[1]) ==
string.format("%p", T.listk(funcs[3])[1]))
end
end
do -- test limit of multiple returns (254 values)
local code = "return 10" .. string.rep(",10", 253)
local res = {assert(load(code))()}
assert(#res == 254 and res[254] == 10)
code = code .. ",10"
local status, msg = load(code)
assert(not status and string.find(msg, "too many returns"))
end
print('OK')
return deep