Re: [MinGW] RFC/RFA: Get Partial Stack Traces on Windows

[Ranjit Mathew <rmathew at gmail dot com>]

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Andrew Haley wrote:
> What happens with -findirect-dispatch?

The stack-trace changes to:
- --------------------------- 8< ---------------------------
Exception in thread "main" java.lang.Exception: I don't like you!
   at java.lang.VMThrowable.fillInStackTrace(a.exe)
   at java.lang.Throwable.<init>(a.exe)
- --------------------------- 8< ---------------------------

However, I don't think the BC-ABI works on Windows as of
now - I was actually expecting an ICE or a segfault somewhere
and was quite surprised when neither of them happened. :-)


- -      if ((void*)rfp < _esp || diff > 4 * 1024 || diff < 0)
+      if (((unsigned int)rfp & 0x00000003) != 0 || (void*)rfp < _esp

> Don't use unsigned int for a pointer; instead use 
> int __attribute__((mode(pointer))).  This is an int that is exactly the
> same size as a pointer.

I was just following in the illustrious footsteps of Bryce. ;-)

Considering that this file (sysdep/i386/backtrace.h) is x86-specific
and is anyway full of otherwise utterly-non-portable-C stuff, does
it matter? (The glibc 2.3.6 stdint.h header on my system just
defines uintptr_t as "unsigned int" for non-64-bit systems.)

Thanks,
Ranjit.

- --
Ranjit Mathew       Email: rmathew AT gmail DOT com

Bangalore, INDIA.     Web: http://rmathew.com/




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