On Mon, Feb 21, 2005 at 12:32:52PM +0800, Euler Herbert wrote: > Hi everyone,
Hi, > I am trying to find out how g++ implements error handling. > My environment is CPU AMD Athlon(tm) XP 2000+, Debian GNU/Linux > 3.1, GCC 3.4.3-6, and Glibc 2.3.2.ds1-20. After researching > assembling codes generated by g++, I have known the beginning > and ending part. That is, we will call __cxa_allocate_exception > when writing 'throw expression', then the constructor of the > exception class, and then __cxa_throw. __cxa_throw calls > _Unwind_RaiseException. But this function is so complex for > me that I cannot get the outline of the real process. However, > I found uw_install_context (which is a macro) will be called > if _Unwind_RaiseException succeeds, and the body of > uw_install_context contains calling of longjmp. So setjmp will > be somewhere, but I did no find it. Could somebody tell me the > outline of the unwinding process? I think this behaviour is defined by this spec: http://www.codesourcery.com/cxx-abi/abi-eh.html Which is part of the C++ ABI spec: http://www.codesourcery.com/cxx-abi/ Hope that helps, jon -- "A woman drove me to drink, I never had the courtesy to thank her." - W.C. Fields
