Re: C++ exceptions

On Thu, Jul 05, 2007 at 01:46:30AM +0100, Pedro Alves wrote:
> This is the part I was trying to get right with the macros:
> 
> > __asm__(
> >     // Data to be placed at start of .text section
> >     "\t.section .init\n"
> >     "\t.word eh_handler\n"
> >     "\t.word 0\n"
> >     "start_eh_text:\n"
> > 
> 
> This is documented to having to be placed immediately before the function it
> corresponds to ...

The trick here is that the default linker script will put sections
labeled with ".init" into the very first part of .text.

$ /opt/mingw32ce/bin/arm-wince-mingw32ce-objdump -Dr out/haret-debug

Disassembly of section .text:

00011000 <___crt_xc_end__>:
   11000:       000183b8        streqh  r8, [r1], -r8
   11004:       00000000        andeq   r0, r0, r0

00011008 <WinMainCRTStartup>:
   11008:       e92d40f0        stmdb   sp!, {r4, r5, r6, r7, lr}
   1100c:       e1a04000        mov     r4, r0
   11010:       e1a05001        mov     r5, r1
[...]

Disassembly of section .pdata:

00035000 <.pdata>:
   35000:       00011008        andeq   r1, r1, r8
   35004:       cfffff02        svcgt   0x00ffff02

> Anyway,
> Looks nice and simple,  I'll give it a try tomorrow too.  Thanks.

Thanks.  And thanks Danny for your code and comments as well.

BTW, I've attached a newer version.  I think I'll check this into
haret's cvs if testing continues to look good.

Sample usage:

  TRY_EXCEPTION_HANDLER
  {
    while (wcount--)
      *vaddr++ = value;
  }
  CATCH_EXCEPTION_HANDLER
  {
    Output(C_ERROR "EXCEPTION while writing %08x to address %p",
      value, vaddr);
  }

I still don't know why I can't leave the exception handler with
EXCEPTION_CONTINUE_EXECUTION..

-Kevin

exceptions.h
Description: Text document

exceptions.cpp
Description: Text document

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