Re: [cxx-abi-dev] ABI modification for exception propagation
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [cxx-abi-dev] ABI modification for exception propagation
- To: cxx-abi-dev@xxxxxxxxxxxxxxxx
- Subject: Re: [cxx-abi-dev] ABI modification for exception propagation
- From: Sebastian Redl <sebastian.redl@xxxxxxxxxxxxxx>
- Date: Mon, 26 May 2008 19:03:04 +0200
Mark Mitchell wrote:
Sebastian Redl wrote:
I experimentally implemented N2197 "Exception Propagation" in GCC and
came to the conclusion that the current exception handling ABI
specification is insufficient. It needs to be changed in order to
make exception propagation possible.
Do you have a URL for this paper?
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html
I wrote up a proposal for the changes. My current implementation
doesn't quite follow this proposal, since I came up with some of the
ideas while writing the document, but I will change it.
It looks like your proposal is not backwards-compatible with the
current ABI. I think we should try very hard to avoid breaking
compatibility. If that means that we need to create new functions
(like __cxa_throw_exception_0x) or accept some performance tradeoffs,
we should do so. But, it should be possible to link old C++ binaries
with the new C++ library, and, ideally, to mix object files from old
and new versions of C++ and the run-time library.
So basically, no symbol conflicts? Or does the backwards compatibility
go further than that?
Sebastian