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dis-bench / src /lua /seeds /errors.lua
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-- $Id: testes/errors.lua $
-- See Copyright Notice in file lua.h
print("testing errors")
local debug = require"debug"
-- avoid problems with 'strict' module (which may generate other error messages)
local mt = getmetatable(_G) or {}
local oldmm = mt.__index
mt.__index = nil
local function checkerr (msg, f, ...)
local st, err = pcall(f, ...)
assert(not st and string.find(err, msg))
end
local function doit (s)
local f, msg = load(s)
if not f then return msg end
local cond, msg = pcall(f)
return (not cond) and msg
end
local function checkmessage (prog, msg, debug)
local m = doit(prog)
if debug then print(m, msg) end
assert(string.find(m, msg, 1, true))
end
local function checksyntax (prog, extra, token, line)
local msg = doit(prog)
if not string.find(token, "^<%a") and not string.find(token, "^char%(")
then token = "'"..token.."'" end
token = string.gsub(token, "(%p)", "%%%1")
local pt = string.format([[^%%[string ".*"%%]:%d: .- near %s$]],
line, token)
assert(string.find(msg, pt))
assert(string.find(msg, msg, 1, true))
end
-- test error message with no extra info
assert(doit("error('hi', 0)") == 'hi')
-- test nil error message
assert(doit("error()") == "<no error object>")
-- test common errors/errors that crashed in the past
assert(doit("table.unpack({}, 1, n=2^30)"))
assert(doit("a=math.sin()"))
assert(not doit("tostring(1)") and doit("tostring()"))
assert(doit"tonumber()")
assert(doit"repeat until 1; a")
assert(doit"return;;")
assert(doit"assert(false)")
assert(doit"assert(nil)")
assert(doit("function a (... , ...) end"))
assert(doit("function a (, ...) end"))
assert(doit("local t={}; t = t[#t] + 1"))
checksyntax([[
local a = {4
]], "'}' expected (to close '{' at line 1)", "<eof>", 3)
do -- testing errors in goto/break
local function checksyntax (prog, msg, line)
local st, err = load(prog)
assert(string.find(err, "line " .. line))
assert(string.find(err, msg, 1, true))
end
checksyntax([[
::A:: a = 1
::A::
]], "label 'A' already defined", 1)
checksyntax([[
a = 1
goto A
do ::A:: end
]], "no visible label 'A'", 2)
end
if not T then
(Message or print)
('\n >>> testC not active: skipping tests for messages in C <<<\n')
else
print "testing memory error message"
local a = {}
for i = 1, 10000 do a[i] = true end -- preallocate array
collectgarbage()
T.totalmem(T.totalmem() + 10000)
-- force a memory error (by a small margin)
local st, msg = pcall(function()
for i = 1, 100000 do a[i] = tostring(i) end
end)
T.totalmem(0)
assert(not st and msg == "not enough" .. " memory")
-- stack space for luaL_traceback (bug in 5.4.6)
local res = T.testC[[
# push 16 elements on the stack
pushnum 1; pushnum 1; pushnum 1; pushnum 1; pushnum 1;
pushnum 1; pushnum 1; pushnum 1; pushnum 1; pushnum 1;
pushnum 1; pushnum 1; pushnum 1; pushnum 1; pushnum 1;
pushnum 1;
# traceback should work with 4 remaining slots
traceback xuxu 1;
return 1
]]
assert(string.find(res, "xuxu.-main chunk"))
do -- tests for error messages about extra arguments from __call
local function createobj (n)
-- function that raises an error on its n-th argument
local code = string.format("argerror %d 'msg'", n)
local func = T.makeCfunc(code)
-- create a chain of 2 __call objects
local M = setmetatable({}, {__call = func})
M = setmetatable({}, {__call = M})
-- put it as a method for a new object
return {foo = M}
end
_G.a = createobj(1) -- error in first (extra) argument
checkmessage("a:foo()", "bad extra argument #1")
_G.a = createobj(2) -- error in second (extra) argument
checkmessage("a:foo()", "bad extra argument #2")
_G.a = createobj(3) -- error in self (after two extra arguments)
checkmessage("a:foo()", "bad self")
_G.a = createobj(4) -- error in first regular argument (after self)
checkmessage("a:foo()", "bad argument #1")
end
end
-- tests for better error messages
checkmessage("a = {} + 1", "arithmetic")
checkmessage("a = {} | 1", "bitwise operation")
checkmessage("a = {} < 1", "attempt to compare")
checkmessage("a = {} <= 1", "attempt to compare")
checkmessage("aaa=1; bbbb=2; aaa=math.sin(3)+bbbb(3)", "global 'bbbb'")
checkmessage("aaa={}; do local aaa=1 end aaa:bbbb(3)", "method 'bbbb'")
checkmessage("local a={}; a.bbbb(3)", "field 'bbbb'")
assert(not string.find(doit"aaa={13}; local bbbb=1; aaa[bbbb](3)", "'bbbb'"))
checkmessage("aaa={13}; local bbbb=1; aaa[bbbb](3)", "number")
checkmessage("aaa=(1)..{}", "a table value")
-- bug in 5.4.6
checkmessage("a = {_ENV = {}}; print(a._ENV.x + 1)", "field 'x'")
-- a similar bug, since 5.4.0
checkmessage("print(('_ENV').x + 1)", "field 'x'")
_G.aaa, _G.bbbb = nil
-- calls
checkmessage("local a; a(13)", "local 'a'")
checkmessage([[
local a = setmetatable({}, {__add = 34})
a = a + 1
]], "metamethod 'add'")
checkmessage([[
local a = setmetatable({}, {__lt = {}})
a = a > a
]], "metamethod 'lt'")
-- tail calls
checkmessage("local a={}; return a.bbbb(3)", "field 'bbbb'")
checkmessage("aaa={}; do local aaa=1 end; return aaa:bbbb(3)", "method 'bbbb'")
checkmessage("aaa = #print", "length of a function value")
checkmessage("aaa = #3", "length of a number value")
_G.aaa = nil
checkmessage("aaa.bbb:ddd(9)", "global 'aaa'")
checkmessage("local aaa={bbb=1}; aaa.bbb:ddd(9)", "field 'bbb'")
checkmessage("local aaa={bbb={}}; aaa.bbb:ddd(9)", "method 'ddd'")
checkmessage("local a,b,c; (function () a = b+1.1 end)()", "upvalue 'b'")
assert(not doit"local aaa={bbb={ddd=next}}; aaa.bbb:ddd(nil)")
-- upvalues being indexed do not go to the stack
checkmessage("local a,b,cc; (function () a = cc[1] end)()", "upvalue 'cc'")
checkmessage("local a,b,cc; (function () a.x = 1 end)()", "upvalue 'a'")
checkmessage("local _ENV = {x={}}; a = a + 1", "global 'a'")
checkmessage("BB=1; local aaa={}; x=aaa+BB", "local 'aaa'")
checkmessage("aaa={}; x=3.3/aaa", "global 'aaa'")
checkmessage("aaa=2; BB=nil;x=aaa*BB", "global 'BB'")
checkmessage("aaa={}; x=-aaa", "global 'aaa'")
-- short circuit
checkmessage("aaa=1; local aaa,bbbb=2,3; aaa = math.sin(1) and bbbb(3)",
"local 'bbbb'")
checkmessage("aaa=1; local aaa,bbbb=2,3; aaa = bbbb(1) or aaa(3)",
"local 'bbbb'")
checkmessage("local a,b,c,f = 1,1,1; f((a and b) or c)", "local 'f'")
checkmessage("local a,b,c = 1,1,1; ((a and b) or c)()", "call a number value")
assert(not string.find(doit"aaa={}; x=(aaa or aaa)+(aaa and aaa)", "'aaa'"))
assert(not string.find(doit"aaa={}; (aaa or aaa)()", "'aaa'"))
checkmessage("print(print < 10)", "function with number")
checkmessage("print(print < print)", "two function values")
checkmessage("print('10' < 10)", "string with number")
checkmessage("print(10 < '23')", "number with string")
-- float->integer conversions
checkmessage("local a = 2.0^100; x = a << 2", "local a")
checkmessage("local a = 1 >> 2.0^100", "has no integer representation")
checkmessage("local a = 10.1 << 2.0^100", "has no integer representation")
checkmessage("local a = 2.0^100 & 1", "has no integer representation")
checkmessage("local a = 2.0^100 & 1e100", "has no integer representation")
checkmessage("local a = 2.0 | 1e40", "has no integer representation")
checkmessage("local a = 2e100 ~ 1", "has no integer representation")
checkmessage("string.sub('a', 2.0^100)", "has no integer representation")
checkmessage("string.rep('a', 3.3)", "has no integer representation")
checkmessage("return 6e40 & 7", "has no integer representation")
checkmessage("return 34 << 7e30", "has no integer representation")
checkmessage("return ~-3e40", "has no integer representation")
checkmessage("return ~-3.009", "has no integer representation")
checkmessage("return 3.009 & 1", "has no integer representation")
checkmessage("return 34 >> {}", "table value")
checkmessage("aaa = 24 // 0", "divide by zero")
checkmessage("aaa = 1 % 0", "'n%0'")
-- type error for an object which is neither in an upvalue nor a register.
-- The following code will try to index the value 10 that is stored in
-- the metatable, without moving it to a register.
checkmessage("local a = setmetatable({}, {__index = 10}).x",
"attempt to index a number value")
-- numeric for loops
checkmessage("for i = {}, 10 do end", "table")
checkmessage("for i = io.stdin, 10 do end", "FILE")
checkmessage("for i = {}, 10 do end", "initial value")
checkmessage("for i = 1, 'x', 10 do end", "string")
checkmessage("for i = 1, {}, 10 do end", "limit")
checkmessage("for i = 1, {} do end", "limit")
checkmessage("for i = 1, 10, print do end", "step")
checkmessage("for i = 1, 10, print do end", "function")
-- passing light userdata instead of full userdata
_G.D = debug
checkmessage([[
-- create light udata
local x = D.upvalueid(function () return debug end, 1)
D.setuservalue(x, {})
]], "light userdata")
_G.D = nil
do -- named objects (field '__name')
checkmessage("math.sin(io.input())", "(number expected, got FILE*)")
_G.XX = setmetatable({}, {__name = "My Type"})
assert(string.find(tostring(XX), "^My Type"))
checkmessage("io.input(XX)", "(FILE* expected, got My Type)")
checkmessage("return XX + 1", "on a My Type value")
checkmessage("return ~io.stdin", "on a FILE* value")
checkmessage("return XX < XX", "two My Type values")
checkmessage("return {} < XX", "table with My Type")
checkmessage("return XX < io.stdin", "My Type with FILE*")
_G.XX = nil
if T then -- extra tests for 'luaL_tolstring'
-- bug in 5.4.3; 'luaL_tolstring' with negative indices
local x = setmetatable({}, {__name="TABLE"})
assert(T.testC("Ltolstring -1; return 1", x) == tostring(x))
local a, b = T.testC("pushint 10; Ltolstring -2; return 2", x)
assert(a == 10 and b == tostring(x))
setmetatable(x, {__tostring=function (o)
assert(o == x)
return "ABC"
end})
local a, b, c = T.testC("pushint 10; Ltolstring -2; return 3", x)
assert(a == x and b == 10 and c == "ABC")
end
end
-- global functions
checkmessage("(io.write or print){}", "io.write")
checkmessage("(collectgarbage or print){}", "collectgarbage")
-- errors in functions without debug info
do
local f = function (a) return a + 1 end
f = assert(load(string.dump(f, true)))
assert(f(3) == 4)
checkerr("^%?:%?:", f, {})
-- code with a move to a local var ('OP_MOV A B' with A<B)
f = function () local a; a = {}; return a + 2 end
-- no debug info (so that 'a' is unknown)
f = assert(load(string.dump(f, true)))
-- symbolic execution should not get lost
checkerr("^%?:%?:.*table value", f)
end
-- tests for field accesses after RK limit
local t = {}
for i = 1, 1000 do
t[i] = "aaa = x" .. i
end
local s = table.concat(t, "; ")
t = nil
checkmessage(s.."; aaa = bbb + 1", "global 'bbb'")
checkmessage("local _ENV=_ENV;"..s.."; aaa = bbb + 1", "global 'bbb'")
checkmessage(s.."; local t = {}; aaa = t.bbb + 1", "field 'bbb'")
-- cannot use 'self' opcode
checkmessage(s.."; local t = {}; t:bbb()", "field 'bbb'")
checkmessage([[aaa=9
repeat until 3==3
local x=math.sin(math.cos(3))
if math.sin(1) == x then return math.sin(1) end -- tail call
local a,b = 1, {
{x='a'..'b'..'c', y='b', z=x},
{1,2,3,4,5} or 3+3<=3+3,
3+1>3+1,
{d = x and aaa[x or y]}}
]], "global 'aaa'")
checkmessage([[
local x,y = {},1
if math.sin(1) == 0 then return 3 end -- return
x.a()]], "field 'a'")
checkmessage([[
prefix = nil
insert = nil
while 1 do
local a
if nil then break end
insert(prefix, a)
end]], "global 'insert'")
checkmessage([[ -- tail call
return math.sin("a")
]], "sin")
checkmessage([[collectgarbage("nooption")]], "invalid option")
checkmessage([[x = print .. "a"]], "concatenate")
checkmessage([[x = "a" .. false]], "concatenate")
checkmessage([[x = {} .. 2]], "concatenate")
checkmessage("getmetatable(io.stdin).__gc()", "no value")
checkmessage([[
local Var
local function main()
NoSuchName (function() Var=0 end)
end
main()
]], "global 'NoSuchName'")
print'+'
aaa = {}; setmetatable(aaa, {__index = string})
checkmessage("aaa:sub()", "bad self")
checkmessage("string.sub('a', {})", "#2")
checkmessage("('a'):sub{}", "#1")
checkmessage("table.sort({1,2,3}, table.sort)", "'table.sort'")
checkmessage("string.gsub('s', 's', setmetatable)", "'setmetatable'")
_G.aaa = nil
-- tests for errors in coroutines
local function f (n)
local c = coroutine.create(f)
local a,b = coroutine.resume(c)
return b
end
assert(string.find(f(), "C stack overflow"))
checkmessage("coroutine.yield()", "outside a coroutine")
f = coroutine.wrap(function () table.sort({1,2,3}, coroutine.yield) end)
checkerr("yield across", f)
-- testing size of 'source' info; size of buffer for that info is
-- LUA_IDSIZE, declared as 60 in luaconf. Get one position for '\0'.
local idsize = 60 - 1
local function checksize (source)
-- syntax error
local _, msg = load("x", source)
msg = string.match(msg, "^([^:]*):") -- get source (1st part before ':')
assert(msg:len() <= idsize)
end
for i = 60 - 10, 60 + 10 do -- check border cases around 60
checksize("@" .. string.rep("x", i)) -- file names
checksize(string.rep("x", i - 10)) -- string sources
checksize("=" .. string.rep("x", i)) -- exact sources
end
-- testing line error
local function lineerror (s, l)
local err,msg = pcall(load(s))
local line = tonumber(string.match(msg, ":(%d+):"))
assert(line == l or (not line and not l))
end
lineerror("local a\n for i=1,'a' do \n print(i) \n end", 2)
lineerror("\n local a \n for k,v in 3 \n do \n print(k) \n end", 3)
lineerror("\n\n for k,v in \n 3 \n do \n print(k) \n end", 4)
lineerror("function a.x.y ()\na=a+1\nend", 1)
lineerror("a = \na\n+\n{}", 3)
lineerror("a = \n3\n+\n(\n4\n/\nprint)", 6)
lineerror("a = \nprint\n+\n(\n4\n/\n7)", 3)
lineerror("a\n=\n-\n\nprint\n;", 3)
lineerror([[
a
( -- <<
23)
]], 2)
lineerror([[
local a = {x = 13}
a
.
x
( -- <<
23
)
]], 5)
lineerror([[
local a = {x = 13}
a
.
x
(
23 + a
)
]], 6)
local p = [[
function g() f() end
function f(x) error('a', XX) end
g()
]]
XX=3;lineerror((p), 3)
XX=0;lineerror((p), false)
XX=1;lineerror((p), 2)
XX=2;lineerror((p), 1)
_G.XX, _G.g, _G.f = nil
lineerror([[
local b = false
if not b then
error 'test'
end]], 3)
lineerror([[
local b = false
if not b then
if not b then
if not b then
error 'test'
end
end
end]], 5)
lineerror([[
_ENV = 1
global function foo ()
local a = 10
return a
end
]], 2)
-- bug in 5.4.0
lineerror([[
local a = 0
local b = 1
local c = b % a
]], 3)
do
-- Force a negative estimate for base line. Error in instruction 2
-- (after VARARGPREP, GETGLOBAL), with first absolute line information
-- (forced by too many lines) in instruction 0.
local s = string.format("%s return __A.x", string.rep("\n", 300))
lineerror(s, 301)
end
if not _soft then
-- several tests that exhaust the Lua stack
collectgarbage()
print"testing stack overflow"
local C = 0
-- get line where stack overflow will happen
local l = debug.getinfo(1, "l").currentline + 1
local function auxy () C=C+1; auxy() end -- produce a stack overflow
function YY ()
collectgarbage("stop") -- avoid running finalizers without stack space
auxy()
collectgarbage("restart")
end
local function checkstackmessage (m)
print("(expected stack overflow after " .. C .. " calls)")
C = 0 -- prepare next count
return (string.find(m, "stack overflow"))
end
-- repeated stack overflows (to check stack recovery)
assert(checkstackmessage(doit('YY()')))
assert(checkstackmessage(doit('YY()')))
assert(checkstackmessage(doit('YY()')))
_G.YY = nil
-- error lines in stack overflow
local l1
local function g(x)
l1 = debug.getinfo(x, "l").currentline + 2
collectgarbage("stop") -- avoid running finalizers without stack space
auxy()
collectgarbage("restart")
end
local _, stackmsg = xpcall(g, debug.traceback, 1)
print('+')
local stack = {}
for line in string.gmatch(stackmsg, "[^\n]*") do
local curr = string.match(line, ":(%d+):")
if curr then table.insert(stack, tonumber(curr)) end
end
local i=1
while stack[i] ~= l1 do
assert(stack[i] == l)
i = i+1
end
assert(i > 15)
-- error in error handling
local res, msg = xpcall(error, error)
assert(not res and msg == 'error in error handling')
print('+')
local function f (x)
if x==0 then error('a\n')
else
local aux = function () return f(x-1) end
local a,b = xpcall(aux, aux)
return a,b
end
end
f(3)
local function loop (x,y,z) return 1 + loop(x, y, z) end
local res, msg = xpcall(loop, function (m)
assert(string.find(m, "stack overflow"))
checkerr("error handling", loop)
assert(math.sin(0) == 0)
return 15
end)
assert(msg == 15)
local f = function ()
for i = 999900, 1000000, 1 do table.unpack({}, 1, i) end
end
checkerr("too many results", f)
end
do -- errors in error handle that not necessarily go forever
local function err (n) -- function to be used as message handler
-- generate an error unless n is zero, so that there is a limited
-- loop of errors
if type(n) ~= "number" then -- some other error?
return n -- report it
elseif n == 0 then
return "END" -- that will be the final message
else error(n - 1) -- does the loop
end
end
local res, msg = xpcall(error, err, 170)
assert(not res and msg == "END")
-- too many levels
local res, msg = xpcall(error, err, 300)
assert(not res and msg == "C stack overflow")
end
do
-- non string messages
local t = {}
local res, msg = pcall(function () error(t) end)
assert(not res and msg == t)
res, msg = pcall(function () error(nil) end)
assert(not res and msg == "<no error object>")
local function f() error{msg='x'} end
res, msg = xpcall(f, function (r) return {msg=r.msg..'y'} end)
assert(msg.msg == 'xy')
-- 'assert' with extra arguments
res, msg = pcall(assert, false, "X", t)
assert(not res and msg == "X")
-- 'assert' with no message
res, msg = pcall(function () assert(false) end)
local line = string.match(msg, "%w+%.lua:(%d+): assertion failed!$")
assert(tonumber(line) == debug.getinfo(1, "l").currentline - 2)
-- 'assert' with non-string messages
res, msg = pcall(assert, false, t)
assert(not res and msg == t)
res, msg = pcall(assert, nil, nil)
assert(not res and type(msg) == "string")
-- 'assert' without arguments
res, msg = pcall(assert)
assert(not res and string.find(msg, "value expected"))
end
-- xpcall with arguments
local a, b, c = xpcall(string.find, error, "alo", "al")
assert(a and b == 1 and c == 2)
a, b, c = xpcall(string.find, function (x) return {} end, true, "al")
assert(not a and type(b) == "table" and c == nil)
print("testing tokens in error messages")
checksyntax("syntax error", "", "error", 1)
checksyntax("1.000", "", "1.000", 1)
checksyntax("[[a]]", "", "[[a]]", 1)
checksyntax("'aa'", "", "'aa'", 1)
checksyntax("while << do end", "", "<<", 1)
checksyntax("for >> do end", "", ">>", 1)
-- test invalid non-printable char in a chunk
checksyntax("a\1a = 1", "", "<\\1>", 1)
-- test 255 as first char in a chunk
checksyntax("\255a = 1", "", "<\\255>", 1)
doit('I = load("a=9+"); aaa=3')
assert(_G.aaa==3 and not _G.I)
_G.I,_G.aaa = nil
print('+')
local lim = 1000
if _soft then lim = 100 end
for i=1,lim do
doit('a = ')
doit('a = 4+nil')
end
-- testing syntax limits
local function testrep (init, rep, close, repc, finalresult)
local s = init .. string.rep(rep, 100) .. close .. string.rep(repc, 100)
local res, msg = load(s)
assert(res) -- 100 levels is OK
if (finalresult) then
assert(res() == finalresult)
end
s = init .. string.rep(rep, 500)
local res, msg = load(s) -- 500 levels not ok
assert(not res and (string.find(msg, "too many") or
string.find(msg, "overflow")))
end
testrep("local a; a", ",a", "= 1", ",1") -- multiple assignment
testrep("local a; a=", "{", "0", "}")
testrep("return ", "(", "2", ")", 2)
testrep("local function a (x) return x end; return ", "a(", "2.2", ")", 2.2)
testrep("", "do ", "", " end")
testrep("", "while a do ", "", " end")
testrep("local a; ", "if a then else ", "", " end")
testrep("", "function foo () ", "", " end")
testrep("local a = ''; return ", "a..", "'a'", "", "a")
testrep("local a = 1; return ", "a^", "a", "", 1)
checkmessage("a = f(x" .. string.rep(",x", 260) .. ")", "too many registers")
-- testing other limits
-- upvalues
local lim = 127
local s = "local function fooA ()\n local "
for j = 1,lim do
s = s.."a"..j..", "
end
s = s.."b,c\n"
s = s.."local function fooB ()\n local "
for j = 1,lim do
s = s.."b"..j..", "
end
s = s.."b\n"
s = s.."function fooC () return b+c"
local c = 1+2
for j = 1,lim do
s = s.."+a"..j.."+b"..j
c = c + 2
end
s = s.."\nend end end"
local a,b = load(s)
assert(c > 255 and string.find(b, "too many upvalues") and
string.find(b, "line 5"))
-- local variables
s = "\nfunction foo ()\n local "
for j = 1,200 do
s = s.."a"..j..", "
end
s = s.."b\n"
local a,b = load(s)
assert(string.find(b, "line 2") and string.find(b, "too many local variables"))
mt.__index = oldmm
print('OK')