I use github.com/nim-lang/lua to make a high level bind to lua I bind a nim
object type to lua, and I wanna use testtype.new() to get a userdata Here is
the code:
import lua
var L = newState()
L.openlibs()
type
test2 = ref object
a :int
b :string
fuck = object
ud:test2
L.newtable()
L.pushstring("new")
L.pushcfunction(proc(l:PState):cint{.cdecl.}=
var p = cast[ptr fuck](L.newuserdata(sizeof(fuck).cint))
echo repr(p)
p.ud = new(test2)
#GC_ref(p.ud)
return 1)
L.settable(-3)
L.setGlobal("testtype")
var res = L.dofile("a.lua")
if res > 0: echo "testfail:" & L.tostring(-1)
L.close()
and a.lua is:
print(11)
print(11)
print(11)
print(11)
print(11)
print(11)
print(11)
print(testtype.new())
print(testtype.new())
print(testtype.new())
print(testtype.new())
print("==========")
when i run the program, it just crashed:
11
11
11
11
11
11
11
Traceback (most recent call last)
a.nim(22) a
lua.nim(593) dofile
a.nim(15) :anonymous
repr.nim(308) reprAny
repr.nim(252) reprAux
repr.nim(234) reprRef
repr.nim(245) reprAux
repr.nim(212) reprRecord
repr.nim(195) reprRecordAux
repr.nim(252) reprAux
repr.nim(234) reprRef
repr.nim(245) reprAux
repr.nim(212) reprRecord
repr.nim(199) reprRecordAux
repr.nim(195) reprRecordAux
repr.nim(255) reprAux
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
,but if i remove the print(11) above, the result is correct:
ref 0x1a5dc98 --> [ud = nil]
userdata: 0x1a5dc98
ref 0x1a5dd78 --> [ud = nil]
userdata: 0x1a5dd78
ref 0x1a5de28 --> [ud = nil]
userdata: 0x1a5de28
ref 0x1a5e358 --> [ud = nil]
userdata: 0x1a5e358
==========
\---- So, I guess it's maybe the gc problem, but no matter how i test, it just
crash,So does anyone konw where the problem is?
