Hi list,
I have a script that crashes the application from time to time. Its
simplified variant is shown below.
My investigation shows that the crash is due to *rsm* cdata value is
accessed after being garbage collected.
I thought that being an upvalue to some live function was enough to be
protected from GC but this case shows that additionally an upvalue
should be accessed (as a Lua value, not as a cdata field) from that
function. If I uncomment "local foo = rsm" then there is no more crashes
anymore.
The question is: is that normal behavior? Is being an upvalue to a live
function not sufficient to avoid being GC'ed?
--------------------------------
local ffi = require'ffi'
local RS = ffi.new("struct RegExpSearch")
local rsm = ffi.new("struct RegExpMatch[1]")
RS.Match = rsm
LoadCustomSortMode {
Compare = function()
-- local foo = rsm
RegExpControl(RS)
end;
}
--
Shmuel
