Jonathan deWerd
jjoon****@gmail*****
Tue Dec 25 07:42:02 JST 2007
Some code I had that returned a struct was crashing, and I managed to
reduce the crash to anything that returned a struct with a C array in
it. For instance, this in main.m:
> struct ttype1 {float a; float b;};
> struct ttype2 {float a[2];};
>
> @implementation NSObject (FooTests)
> - (struct ttype1)test1 {
> struct ttype1 r = {1., 2.};
> return r;
> }
> - (struct ttype2)test2 {
> struct ttype2 r;
> r.a[0] = 1.;
> r.a[1] = 2.;
> return r;
> }
> @end
>
> int main(int argc, const char *argv[])
> {
> return RBApplicationMain("rb_main.rb", argc, argv);
> }
would cause this in rb_man.rb to crash on the second test:
> r = OSX::NSObject.alloc.init
> puts r.test1 #works just fine
> puts r.test2 #crashed before patch, doesn't after
I managed to track the problem down to a 0 alignment being assumed for
array types in structs. This caused the padded size of such struct
types to be 0 and made the bridge crash and burn whenever an
unfortunately typed objc method was called across the bridge.
Here is the test project: (email me if attachments don't work, I am a
newbie so I don't know)
and here is the diff file of libffi.m that patches it so it works:
Sorry if this isn't the Right Way to submit a patch, but as I said, I
am new here :)
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