Re: Must unwind in gcc be ported for gcj?

[Bryce McKinlay <bmckinlay@gmail.com>]

On Thu, Feb 24, 2011 at 1:19 AM, majia gm <gmmajia@gmail.com> wrote:
> Hi, everyone.
>
> I'm porting gcj (gcc-4.4.2) to another platform. Right now the gij
> fails when interpreting the following program.
>
> File A.java:
>
> import B;
> public class A{
>
>        public static void main(String args[])
>        {
>                try{
>                        B b=(B)Class.forName("B").newInstance();
>                catch(Exception e)
>                {
>                        System.out.println("Cannot find Class B");
>                }
>        }
> }
>
> File B.java:
>
> public class B
> {}
>
> I use gdb to track gij, and I found GetCallingClass() in forName()
> returns NULL, then the bootstrap loader is used to search the Class B
> but with no result. Should the Class B has the same class loader, the
> system class loader as the Class A dose?
>
> Then I track the GetCallingClass(), and I found it needs the unwind
> function provided by gcc.  Must I port the unwind function?
>

Have a look at SJLJ_EXCEPTIONS. This should allow you to get something
working without having to port the full unwinder.

Bryce