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lua/testes/db.lua
Roberto Ierusalimschy 066e0f93c4 Fix debug information about finalizers 
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.)
2021-12-14 12:50:05 -03:00

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-- $Id: testes/db.lua $
-- See Copyright Notice in file all.lua
-- testing debug library
local debug = require "debug"
local function dostring(s) return assert(load(s))() end
print"testing debug library and debug information"
do
local a=1
end
assert(not debug.gethook())
local testline = 19 -- line where 'test' is defined
function test (s, l, p) -- this must be line 19
collectgarbage() -- avoid gc during trace
local function f (event, line)
assert(event == 'line')
local l = table.remove(l, 1)
if p then print(l, line) end
assert(l == line, "wrong trace!!")
end
debug.sethook(f,"l"); load(s)(); debug.sethook()
assert(#l == 0)
end
do
assert(not pcall(debug.getinfo, print, "X")) -- invalid option
assert(not pcall(debug.getinfo, 0, ">")) -- invalid option
assert(not debug.getinfo(1000)) -- out of range level
assert(not debug.getinfo(-1)) -- out of range level
local a = debug.getinfo(print)
assert(a.what == "C" and a.short_src == "[C]")
a = debug.getinfo(print, "L")
assert(a.activelines == nil)
local b = debug.getinfo(test, "SfL")
assert(b.name == nil and b.what == "Lua" and b.linedefined == testline and
b.lastlinedefined == b.linedefined + 10 and
b.func == test and not string.find(b.short_src, "%["))
assert(b.activelines[b.linedefined + 1] and
b.activelines[b.lastlinedefined])
assert(not b.activelines[b.linedefined] and
not b.activelines[b.lastlinedefined + 1])
end
-- test file and string names truncation
a = "function f () end"
local function dostring (s, x) return load(s, x)() end
dostring(a)
assert(debug.getinfo(f).short_src == string.format('[string "%s"]', a))
dostring(a..string.format("; %s\n=1", string.rep('p', 400)))
assert(string.find(debug.getinfo(f).short_src, '^%[string [^\n]*%.%.%."%]$'))
dostring(a..string.format("; %s=1", string.rep('p', 400)))
assert(string.find(debug.getinfo(f).short_src, '^%[string [^\n]*%.%.%."%]$'))
dostring("\n"..a)
assert(debug.getinfo(f).short_src == '[string "..."]')
dostring(a, "")
assert(debug.getinfo(f).short_src == '[string ""]')
dostring(a, "@xuxu")
assert(debug.getinfo(f).short_src == "xuxu")
dostring(a, "@"..string.rep('p', 1000)..'t')
assert(string.find(debug.getinfo(f).short_src, "^%.%.%.p*t$"))
dostring(a, "=xuxu")
assert(debug.getinfo(f).short_src == "xuxu")
dostring(a, string.format("=%s", string.rep('x', 500)))
assert(string.find(debug.getinfo(f).short_src, "^x*$"))
dostring(a, "=")
assert(debug.getinfo(f).short_src == "")
a = nil; f = nil;
repeat
local g = {x = function ()
local a = debug.getinfo(2)
assert(a.name == 'f' and a.namewhat == 'local')
a = debug.getinfo(1)
assert(a.name == 'x' and a.namewhat == 'field')
return 'xixi'
end}
local f = function () return 1+1 and (not 1 or g.x()) end
assert(f() == 'xixi')
g = debug.getinfo(f)
assert(g.what == "Lua" and g.func == f and g.namewhat == "" and not g.name)
function f (x, name) -- local!
name = name or 'f'
local a = debug.getinfo(1)
assert(a.name == name and a.namewhat == 'local')
return x
end
-- breaks in different conditions
if 3>4 then break end; f()
if 3<4 then a=1 else break end; f()
while 1 do local x=10; break end; f()
local b = 1
if 3>4 then return math.sin(1) end; f()
a = 3<4; f()
a = 3<4 or 1; f()
repeat local x=20; if 4>3 then f() else break end; f() until 1
g = {}
f(g).x = f(2) and f(10)+f(9)
assert(g.x == f(19))
function g(x) if not x then return 3 end return (x('a', 'x')) end
assert(g(f) == 'a')
until 1
test([[if
math.sin(1)
then
a=1
else
a=2
end
]], {2,3,4,7})
test([[
local function foo()
end
foo()
A = 1
A = 2
A = 3
]], {2, 3, 2, 4, 5, 6})
test([[--
if nil then
a=1
else
a=2
end
]], {2,5,6})
test([[a=1
repeat
a=a+1
until a==3
]], {1,3,4,3,4})
test([[ do
return
end
]], {2})
test([[local a
a=1
while a<=3 do
a=a+1
end
]], {1,2,3,4,3,4,3,4,3,5})
test([[while math.sin(1) do
if math.sin(1)
then break
end
end
a=1]], {1,2,3,6})
test([[for i=1,3 do
a=i
end
]], {1,2,1,2,1,2,1,3})
test([[for i,v in pairs{'a','b'} do
a=tostring(i) .. v
end
]], {1,2,1,2,1,3})
test([[for i=1,4 do a=1 end]], {1,1,1,1})
do -- testing line info/trace with large gaps in source
local a = {1, 2, 3, 10, 124, 125, 126, 127, 128, 129, 130,
255, 256, 257, 500, 1000}
local s = [[
local b = {10}
a = b[1] X + Y b[1]
b = 4
]]
for _, i in ipairs(a) do
local subs = {X = string.rep("\n", i)}
for _, j in ipairs(a) do
subs.Y = string.rep("\n", j)
local s = string.gsub(s, "[XY]", subs)
test(s, {1, 2 + i, 2 + i + j, 2 + i, 2 + i + j, 3 + i + j})
end
end
end
do -- testing active lines
local function checkactivelines (f, lines)
local t = debug.getinfo(f, "SL")
for _, l in pairs(lines) do
l = l + t.linedefined
assert(t.activelines[l])
t.activelines[l] = undef
end
assert(next(t.activelines) == nil) -- no extra lines
end
checkactivelines(function (...) -- vararg function
-- 1st line is empty
-- 2nd line is empty
-- 3th line is empty
local a = 20
-- 5th line is empty
local b = 30
-- 7th line is empty
end, {4, 6, 8})
checkactivelines(function (a)
-- 1st line is empty
-- 2nd line is empty
local a = 20
local b = 30
-- 5th line is empty
end, {3, 4, 6})
checkactivelines(function (a, b, ...) end, {0})
checkactivelines(function (a, b)
end, {1})
for _, n in pairs{0, 1, 2, 10, 50, 100, 1000, 10000} do
checkactivelines(
load(string.format("%s return 1", string.rep("\n", n))),
{n + 1})
end
end
print'+'
-- invalid levels in [gs]etlocal
assert(not pcall(debug.getlocal, 20, 1))
assert(not pcall(debug.setlocal, -1, 1, 10))
-- parameter names
local function foo (a,b,...) local d, e end
local co = coroutine.create(foo)
assert(debug.getlocal(foo, 1) == 'a')
assert(debug.getlocal(foo, 2) == 'b')
assert(not debug.getlocal(foo, 3))
assert(debug.getlocal(co, foo, 1) == 'a')
assert(debug.getlocal(co, foo, 2) == 'b')
assert(not debug.getlocal(co, foo, 3))
assert(not debug.getlocal(print, 1))
local function foo () return (debug.getlocal(1, -1)) end
assert(not foo(10))
-- varargs
local function foo (a, ...)
local t = table.pack(...)
for i = 1, t.n do
local n, v = debug.getlocal(1, -i)
assert(n == "(vararg)" and v == t[i])
end
assert(not debug.getlocal(1, -(t.n + 1)))
assert(not debug.setlocal(1, -(t.n + 1), 30))
if t.n > 0 then
(function (x)
assert(debug.setlocal(2, -1, x) == "(vararg)")
assert(debug.setlocal(2, -t.n, x) == "(vararg)")
end)(430)
assert(... == 430)
end
end
foo()
foo(print)
foo(200, 3, 4)
local a = {}
for i = 1, (_soft and 100 or 1000) do a[i] = i end
foo(table.unpack(a))
a = nil
do -- test hook presence in debug info
assert(not debug.gethook())
local count = 0
local function f ()
assert(debug.getinfo(1).namewhat == "hook")
local sndline = string.match(debug.traceback(), "\n(.-)\n")
assert(string.find(sndline, "hook"))
count = count + 1
end
debug.sethook(f, "l")
local a = 0
_ENV.a = a
a = 1
debug.sethook()
assert(count == 4)
end
-- hook table has weak keys
assert(getmetatable(debug.getregistry()._HOOKKEY).__mode == 'k')
a = {}; L = nil
local glob = 1
local oldglob = glob
debug.sethook(function (e,l)
collectgarbage() -- force GC during a hook
local f, m, c = debug.gethook()
assert(m == 'crl' and c == 0)
if e == "line" then
if glob ~= oldglob then
L = l-1 -- get the first line where "glob" has changed
oldglob = glob
end
elseif e == "call" then
local f = debug.getinfo(2, "f").func
a[f] = 1
else assert(e == "return")
end
end, "crl")
function f(a,b)
collectgarbage()
local _, x = debug.getlocal(1, 1)
local _, y = debug.getlocal(1, 2)
assert(x == a and y == b)
assert(debug.setlocal(2, 3, "pera") == "AA".."AA")
assert(debug.setlocal(2, 4, "ma<EFBFBD><EFBFBD>") == "B")
x = debug.getinfo(2)
assert(x.func == g and x.what == "Lua" and x.name == 'g' and
x.nups == 2 and string.find(x.source, "^@.*db%.lua$"))
glob = glob+1
assert(debug.getinfo(1, "l").currentline == L+1)
assert(debug.getinfo(1, "l").currentline == L+2)
end
function foo()
glob = glob+1
assert(debug.getinfo(1, "l").currentline == L+1)
end; foo() -- set L
-- check line counting inside strings and empty lines
_ = 'alo\
alo' .. [[
]]
--[[
]]
assert(debug.getinfo(1, "l").currentline == L+11) -- check count of lines
function g (...)
local arg = {...}
do local a,b,c; a=math.sin(40); end
local feijao
local AAAA,B = "xuxu", "mam<EFBFBD>o"
f(AAAA,B)
assert(AAAA == "pera" and B == "ma<EFBFBD><EFBFBD>")
do
local B = 13
local x,y = debug.getlocal(1,5)
assert(x == 'B' and y == 13)
end
end
g()
assert(a[f] and a[g] and a[assert] and a[debug.getlocal] and not a[print])
-- tests for manipulating non-registered locals (C and Lua temporaries)
local n, v = debug.getlocal(0, 1)
assert(v == 0 and n == "(C temporary)")
local n, v = debug.getlocal(0, 2)
assert(v == 2 and n == "(C temporary)")
assert(not debug.getlocal(0, 3))
assert(not debug.getlocal(0, 0))
function f()
assert(select(2, debug.getlocal(2,3)) == 1)
assert(not debug.getlocal(2,4))
debug.setlocal(2, 3, 10)
return 20
end
function g(a,b) return (a+1) + f() end
assert(g(0,0) == 30)
debug.sethook(nil);
assert(not debug.gethook())
-- minimal tests for setuservalue/getuservalue
do
assert(not debug.setuservalue(io.stdin, 10))
local a, b = debug.getuservalue(io.stdin, 10)
assert(a == nil and not b)
end
-- testing iteraction between multiple values x hooks
do
local function f(...) return 3, ... end
local count = 0
local a = {}
for i = 1, 100 do a[i] = i end
debug.sethook(function () count = count + 1 end, "", 1)
local t = {table.unpack(a)}
assert(#t == 100)
t = {table.unpack(a, 1, 3)}
assert(#t == 3)
t = {f(table.unpack(a, 1, 30))}
assert(#t == 31)
end
-- testing access to function arguments
local function collectlocals (level)
local tab = {}
for i = 1, math.huge do
local n, v = debug.getlocal(level + 1, i)
if not (n and string.find(n, "^[a-zA-Z0-9_]+$")) then
break -- consider only real variables
end
tab[n] = v
end
return tab
end
X = nil
a = {}
function a:f (a, b, ...) local arg = {...}; local c = 13 end
debug.sethook(function (e)
assert(e == "call")
dostring("XX = 12") -- test dostring inside hooks
-- testing errors inside hooks
assert(not pcall(load("a='joao'+1")))
debug.sethook(function (e, l)
assert(debug.getinfo(2, "l").currentline == l)
local f,m,c = debug.gethook()
assert(e == "line")
assert(m == 'l' and c == 0)
debug.sethook(nil) -- hook is called only once
assert(not X) -- check that
X = collectlocals(2)
end, "l")
end, "c")
a:f(1,2,3,4,5)
assert(X.self == a and X.a == 1 and X.b == 2 and X.c == nil)
assert(XX == 12)
assert(not debug.gethook())
-- testing access to local variables in return hook (bug in 5.2)
do
local X = false
local function foo (a, b, ...)
do local x,y,z end
local c, d = 10, 20
return
end
local function aux ()
if debug.getinfo(2).name == "foo" then
X = true -- to signal that it found 'foo'
local tab = {a = 100, b = 200, c = 10, d = 20}
for n, v in pairs(collectlocals(2)) do
assert(tab[n] == v)
tab[n] = undef
end
assert(next(tab) == nil) -- 'tab' must be empty
end
end
debug.sethook(aux, "r"); foo(100, 200); debug.sethook()
assert(X)
end
local function eqseq (t1, t2)
assert(#t1 == #t2)
for i = 1, #t1 do
assert(t1[i] == t2[i])
end
end
do print("testing inspection of parameters/returned values")
local on = false
local inp, out
local function hook (event)
if not on then return end
local ar = debug.getinfo(2, "ruS")
local t = {}
for i = ar.ftransfer, ar.ftransfer + ar.ntransfer - 1 do
local _, v = debug.getlocal(2, i)
t[#t + 1] = v
end
if event == "return" then
out = t
else
inp = t
end
end
debug.sethook(hook, "cr")
on = true; math.sin(3); on = false
eqseq(inp, {3}); eqseq(out, {math.sin(3)})
on = true; select(2, 10, 20, 30, 40); on = false
eqseq(inp, {2, 10, 20, 30, 40}); eqseq(out, {20, 30, 40})
local function foo (a, ...) return ... end
local function foo1 () on = not on; return foo(20, 10, 0) end
foo1(); on = false
eqseq(inp, {20}); eqseq(out, {10, 0})
debug.sethook()
end
-- testing upvalue access
local function getupvalues (f)
local t = {}
local i = 1
while true do
local name, value = debug.getupvalue(f, i)
if not name then break end
assert(not t[name])
t[name] = value
i = i + 1
end
return t
end
local a,b,c = 1,2,3
local function foo1 (a) b = a; return c end
local function foo2 (x) a = x; return c+b end
assert(not debug.getupvalue(foo1, 3))
assert(not debug.getupvalue(foo1, 0))
assert(not debug.setupvalue(foo1, 3, "xuxu"))
local t = getupvalues(foo1)
assert(t.a == nil and t.b == 2 and t.c == 3)
t = getupvalues(foo2)
assert(t.a == 1 and t.b == 2 and t.c == 3)
assert(debug.setupvalue(foo1, 1, "xuxu") == "b")
assert(({debug.getupvalue(foo2, 3)})[2] == "xuxu")
-- upvalues of C functions are allways "called" "" (the empty string)
assert(debug.getupvalue(string.gmatch("x", "x"), 1) == "")
-- testing count hooks
local a=0
debug.sethook(function (e) a=a+1 end, "", 1)
a=0; for i=1,1000 do end; assert(1000 < a and a < 1012)
debug.sethook(function (e) a=a+1 end, "", 4)
a=0; for i=1,1000 do end; assert(250 < a and a < 255)
local f,m,c = debug.gethook()
assert(m == "" and c == 4)
debug.sethook(function (e) a=a+1 end, "", 4000)
a=0; for i=1,1000 do end; assert(a == 0)
do
debug.sethook(print, "", 2^24 - 1) -- count upperbound
local f,m,c = debug.gethook()
assert(({debug.gethook()})[3] == 2^24 - 1)
end
debug.sethook()
-- tests for tail calls
local function f (x)
if x then
assert(debug.getinfo(1, "S").what == "Lua")
assert(debug.getinfo(1, "t").istailcall == true)
local tail = debug.getinfo(2)
assert(tail.func == g1 and tail.istailcall == true)
assert(debug.getinfo(3, "S").what == "main")
print"+"
end
end
function g(x) return f(x) end
function g1(x) g(x) end
local function h (x) local f=g1; return f(x) end
h(true)
local b = {}
debug.sethook(function (e) table.insert(b, e) end, "cr")
h(false)
debug.sethook()
local res = {"return", -- first return (from sethook)
"call", "tail call", "call", "tail call",
"return", "return",
"call", -- last call (to sethook)
}
for i = 1, #res do assert(res[i] == table.remove(b, 1)) end
b = 0
debug.sethook(function (e)
if e == "tail call" then
b = b + 1
assert(debug.getinfo(2, "t").istailcall == true)
else
assert(debug.getinfo(2, "t").istailcall == false)
end
end, "c")
h(false)
debug.sethook()
assert(b == 2) -- two tail calls
lim = _soft and 3000 or 30000
local function foo (x)
if x==0 then
assert(debug.getinfo(2).what == "main")
local info = debug.getinfo(1)
assert(info.istailcall == true and info.func == foo)
else return foo(x-1)
end
end
foo(lim)
print"+"
-- testing local function information
co = load[[
local A = function ()
return x
end
return
]]
local a = 0
-- 'A' should be visible to debugger only after its complete definition
debug.sethook(function (e, l)
if l == 3 then a = a + 1; assert(debug.getlocal(2, 1) == "(temporary)")
elseif l == 4 then a = a + 1; assert(debug.getlocal(2, 1) == "A")
end
end, "l")
co() -- run local function definition
debug.sethook() -- turn off hook
assert(a == 2) -- ensure all two lines where hooked
-- testing traceback
assert(debug.traceback(print) == print)
assert(debug.traceback(print, 4) == print)
assert(string.find(debug.traceback("hi", 4), "^hi\n"))
assert(string.find(debug.traceback("hi"), "^hi\n"))
assert(not string.find(debug.traceback("hi"), "'debug.traceback'"))
assert(string.find(debug.traceback("hi", 0), "'debug.traceback'"))
assert(string.find(debug.traceback(), "^stack traceback:\n"))
do -- C-function names in traceback
local st, msg = (function () return pcall end)()(debug.traceback)
assert(st == true and string.find(msg, "pcall"))
end
-- testing nparams, nups e isvararg
local t = debug.getinfo(print, "u")
assert(t.isvararg == true and t.nparams == 0 and t.nups == 0)
t = debug.getinfo(function (a,b,c) end, "u")
assert(t.isvararg == false and t.nparams == 3 and t.nups == 0)
t = debug.getinfo(function (a,b,...) return t[a] end, "u")
assert(t.isvararg == true and t.nparams == 2 and t.nups == 1)
t = debug.getinfo(1) -- main
assert(t.isvararg == true and t.nparams == 0 and t.nups == 1 and
debug.getupvalue(t.func, 1) == "_ENV")
t = debug.getinfo(math.sin) -- C function
assert(t.isvararg == true and t.nparams == 0 and t.nups == 0)
t = debug.getinfo(string.gmatch("abc", "a")) -- C closure
assert(t.isvararg == true and t.nparams == 0 and t.nups > 0)
-- testing debugging of coroutines
local function checktraceback (co, p, level)
local tb = debug.traceback(co, nil, level)
local i = 0
for l in string.gmatch(tb, "[^\n]+\n?") do
assert(i == 0 or string.find(l, p[i]))
i = i+1
end
assert(p[i] == undef)
end
local function f (n)
if n > 0 then f(n-1)
else coroutine.yield() end
end
local co = coroutine.create(f)
coroutine.resume(co, 3)
checktraceback(co, {"yield", "db.lua", "db.lua", "db.lua", "db.lua"})
checktraceback(co, {"db.lua", "db.lua", "db.lua", "db.lua"}, 1)
checktraceback(co, {"db.lua", "db.lua", "db.lua"}, 2)
checktraceback(co, {"db.lua"}, 4)
checktraceback(co, {}, 40)
co = coroutine.create(function (x)
local a = 1
coroutine.yield(debug.getinfo(1, "l"))
coroutine.yield(debug.getinfo(1, "l").currentline)
return a
end)
local tr = {}
local foo = function (e, l) if l then table.insert(tr, l) end end
debug.sethook(co, foo, "lcr")
local _, l = coroutine.resume(co, 10)
local x = debug.getinfo(co, 1, "lfLS")
assert(x.currentline == l.currentline and x.activelines[x.currentline])
assert(type(x.func) == "function")
for i=x.linedefined + 1, x.lastlinedefined do
assert(x.activelines[i])
x.activelines[i] = undef
end
assert(next(x.activelines) == nil) -- no 'extra' elements
assert(not debug.getinfo(co, 2))
local a,b = debug.getlocal(co, 1, 1)
assert(a == "x" and b == 10)
a,b = debug.getlocal(co, 1, 2)
assert(a == "a" and b == 1)
debug.setlocal(co, 1, 2, "hi")
assert(debug.gethook(co) == foo)
assert(#tr == 2 and
tr[1] == l.currentline-1 and tr[2] == l.currentline)
a,b,c = pcall(coroutine.resume, co)
assert(a and b and c == l.currentline+1)
checktraceback(co, {"yield", "in function <"})
a,b = coroutine.resume(co)
assert(a and b == "hi")
assert(#tr == 4 and tr[4] == l.currentline+2)
assert(debug.gethook(co) == foo)
assert(not debug.gethook())
checktraceback(co, {})
-- check get/setlocal in coroutines
co = coroutine.create(function (x)
local a, b = coroutine.yield(x)
assert(a == 100 and b == nil)
return x
end)
a, b = coroutine.resume(co, 10)
assert(a and b == 10)
a, b = debug.getlocal(co, 1, 1)
assert(a == "x" and b == 10)
assert(not debug.getlocal(co, 1, 5))
assert(debug.setlocal(co, 1, 1, 30) == "x")
assert(not debug.setlocal(co, 1, 5, 40))
a, b = coroutine.resume(co, 100)
assert(a and b == 30)
-- check traceback of suspended (or dead with error) coroutines
function f(i)
if i == 0 then error(i)
else coroutine.yield(); f(i-1)
end
end
co = coroutine.create(function (x) f(x) end)
a, b = coroutine.resume(co, 3)
t = {"'coroutine.yield'", "'f'", "in function <"}
while coroutine.status(co) == "suspended" do
checktraceback(co, t)
a, b = coroutine.resume(co)
table.insert(t, 2, "'f'") -- one more recursive call to 'f'
end
t[1] = "'error'"
checktraceback(co, t)
-- test acessing line numbers of a coroutine from a resume inside
-- a C function (this is a known bug in Lua 5.0)
local function g(x)
coroutine.yield(x)
end
local function f (i)
debug.sethook(function () end, "l")
for j=1,1000 do
g(i+j)
end
end
local co = coroutine.wrap(f)
co(10)
pcall(co)
pcall(co)
assert(type(debug.getregistry()) == "table")
-- test tagmethod information
local a = {}
local function f (t)
local info = debug.getinfo(1);
assert(info.namewhat == "metamethod")
a.op = info.name
return info.name
end
setmetatable(a, {
__index = f; __add = f; __div = f; __mod = f; __concat = f; __pow = f;
__mul = f; __idiv = f; __unm = f; __len = f; __sub = f;
__shl = f; __shr = f; __bor = f; __bxor = f;
__eq = f; __le = f; __lt = f; __unm = f; __len = f; __band = f;
__bnot = f;
})
local b = setmetatable({}, getmetatable(a))
assert(a[3] == "index" and a^3 == "pow" and a..a == "concat")
assert(a/3 == "div" and 3%a == "mod")
assert(a+3 == "add" and 3-a == "sub" and a*3 == "mul" and
-a == "unm" and #a == "len" and a&3 == "band")
assert(a + 30000 == "add" and a - 3.0 == "sub" and a * 3.0 == "mul" and
-a == "unm" and #a == "len" and a & 3 == "band")
assert(a|3 == "bor" and 3~a == "bxor" and a<<3 == "shl" and a>>1 == "shr")
assert (a==b and a.op == "eq")
assert (a>=b and a.op == "le")
assert ("x">=a and a.op == "le")
assert (a>b and a.op == "lt")
assert (a>10 and a.op == "lt")
assert(~a == "bnot")
do -- testing for-iterator name
local function f()
assert(debug.getinfo(1).name == "for iterator")
end
for i in f do end
end
do -- testing debug info for finalizers
local name = nil
-- create a piece of garbage with a finalizer
setmetatable({}, {__gc = function ()
local t = debug.getinfo(1) -- get function information
assert(t.namewhat == "metamethod")
name = t.name
end})
-- repeat until previous finalizer runs (setting 'name')
repeat local a = {} until name
assert(name == "__gc")
end
do
print("testing traceback sizes")
local function countlines (s)
return select(2, string.gsub(s, "\n", ""))
end
local function deep (lvl, n)
if lvl == 0 then
return (debug.traceback("message", n))
else
return (deep(lvl-1, n))
end
end
local function checkdeep (total, start)
local s = deep(total, start)
local rest = string.match(s, "^message\nstack traceback:\n(.*)$")
local cl = countlines(rest)
-- at most 10 lines in first part, 11 in second, plus '...'
assert(cl <= 10 + 11 + 1)
local brk = string.find(rest, "%.%.%.")
if brk then -- does message have '...'?
local rest1 = string.sub(rest, 1, brk)
local rest2 = string.sub(rest, brk, #rest)
assert(countlines(rest1) == 10 and countlines(rest2) == 11)
else
assert(cl == total - start + 2)
end
end
for d = 1, 51, 10 do
for l = 1, d do
-- use coroutines to ensure complete control of the stack
coroutine.wrap(checkdeep)(d, l)
end
end
end
print("testing debug functions on chunk without debug info")
prog = [[-- program to be loaded without debug information (strip)
local debug = require'debug'
local a = 12 -- a local variable
local n, v = debug.getlocal(1, 1)
assert(n == "(temporary)" and v == debug) -- unkown name but known value
n, v = debug.getlocal(1, 2)
assert(n == "(temporary)" and v == 12) -- unkown name but known value
-- a function with an upvalue
local f = function () local x; return a end
n, v = debug.getupvalue(f, 1)
assert(n == "(no name)" and v == 12)
assert(debug.setupvalue(f, 1, 13) == "(no name)")
assert(a == 13)
local t = debug.getinfo(f)
assert(t.name == nil and t.linedefined > 0 and
t.lastlinedefined == t.linedefined and
t.short_src == "?")
assert(debug.getinfo(1).currentline == -1)
t = debug.getinfo(f, "L").activelines
assert(next(t) == nil) -- active lines are empty
-- dump/load a function without debug info
f = load(string.dump(f))
t = debug.getinfo(f)
assert(t.name == nil and t.linedefined > 0 and
t.lastlinedefined == t.linedefined and
t.short_src == "?")
assert(debug.getinfo(1).currentline == -1)
return a
]]
-- load 'prog' without debug info
local f = assert(load(string.dump(load(prog), true)))
assert(f() == 13)
do -- bug in 5.4.0: line hooks in stripped code
local function foo ()
local a = 1
local b = 2
return b
end
local s = load(string.dump(foo, true))
local line = true
debug.sethook(function (e, l)
assert(e == "line")
line = l
end, "l")
assert(s() == 2); debug.sethook(nil)
assert(line == nil) -- hook called withoug debug info for 1st instruction
end
do -- tests for 'source' in binary dumps
local prog = [[
return function (x)
return function (y)
return x + y
end
end
]]
local name = string.rep("x", 1000)
local p = assert(load(prog, name))
-- load 'p' as a binary chunk with debug information
local c = string.dump(p)
assert(#c > 1000 and #c < 2000) -- no repetition of 'source' in dump
local f = assert(load(c))
local g = f()
local h = g(3)
assert(h(5) == 8)
assert(debug.getinfo(f).source == name and -- all functions have 'source'
debug.getinfo(g).source == name and
debug.getinfo(h).source == name)
-- again, without debug info
local c = string.dump(p, true)
assert(#c < 500) -- no 'source' in dump
local f = assert(load(c))
local g = f()
local h = g(30)
assert(h(50) == 80)
assert(debug.getinfo(f).source == '=?' and -- no function has 'source'
debug.getinfo(g).source == '=?' and
debug.getinfo(h).source == '=?')
end
print"OK"
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