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Article #989

Re: CW7.2 and jnilib and C++ Exception woes

#989
From: Leon
Date: Fri, 03 May 2002 19:44
73 lines
3307 bytes
Here is the HelloWorld example that I modified to demonstrate my problem.
The project contains a target called HelloWorld_MACH that I added to produce
libHelloWorld.jnilib for MacOSX.  Perhaps I goofed on the settings, that's
why it's causing exceptions to crash.

Download it at

http:\\www.lifeforms.com\helpme\JNI example.sit



--
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l_e_o_n @ c_h_a_r_a_c_t_e_r_m_o_t_i_o_n . c_o_m


"Leon" <l_e_o_n@charactermotion.com> wrote in message
news:S2Yz8.3742$5X6.106437@news0.telusplanet.net...
> How come C++ exceptions do not work on MacOSX with a CW7.2 compiled
> jnilib???
>
> As a simple test, I modified the included HelloWorld JNI example, located
in
> the (Codewarrior Examples):CodeWarrior Java:Metrowerks Sample
> Projects:Native examples:JNI example:Sources folder to create a JNILIB
> (convert to Mach-O bundle target), and added the following method:
>
> class A() {};
>
> JNIEXPORT void JNICALL Java_com_mw_example_HelloWorld_throwMethod
>     (JNIEnv *env, jobject obj)
> {
>      try
>      {
>               throw A();
>      }
>      catch (...)
>      {
>               printf("Caught!\n");
>      };
> }
>
> Of course, changes were also made in HelloWorld.java and
TestHelloWorld.java
> to reflect the new method.
>
> The example works as it should calling each native function, but when it
> calls throwMethod(), it crashes (segmentation fault).  Upon further
> inspection with GDB, it reported the following:
>
> Program received signal EXC_BAD_ACCESS, Could not access memory.
> ExPPC_FindExceptionRecord (returnaddr=0x15ac7b0 "H", info=0xbfffe88c) at
> ExceptionPPC.cp:874
> 874    if ((returnaddr >= (char *) p->functionaddr)
>
>
> What's going?  Do I need to register my exception or something??
>
> I've updated my Universal Headers and have recompiled all the MetroWerk
> related projects (precompiled headers, MSL runtimes, MSL C++, etc...).
>
> Could anyone verify that this indeed is a problem or is there something
> wrong with my Mac...
>
> --
> Remove the underscores to reply to me.
> l_e_o_n @ c_h_a_r_a_c_t_e_r_m_o_t_i_o_n . c_o_m
>
>
>
>
>
>
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From: "Leon" <l_e_o_n@charactermotion.com>
Newsgroups: comp.sys.mac.programmer.codewarrior,codewarrior.mac
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Subject: Re: CW7.2 and jnilib and C++ Exception woes
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