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Date: Thu, 24 Feb 2011 10:07:00 -0000
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Subject: Re: Must unwind in gcc be ported for gcj?
From: Bryce McKinlay <bmckinlay@gmail.com>
To: majia gm <gmmajia@gmail.com>
Cc: Java List <java@gcc.gnu.org>, gcc-help@gcc.gnu.org
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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{
>
> =A0 =A0 =A0 =A0public static void main(String args[])
> =A0 =A0 =A0 =A0{
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0try{
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0B b=3D(B)Class.forName("B"=
).newInstance();
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0catch(Exception e)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0{
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0System.out.println("Cannot=
 find Class B");
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
> =A0 =A0 =A0 =A0}
> }
>
> 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. =A0Must 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