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Instead of modifying exceptions to wear additional information, we instead use
a dedicated type now. All exception-using functions were modified to support
this new type, in particular Future's fix_exn-s and the tactic monad.
To solve the problem of enriching exceptions at raise time and recover this
data in the try-with handler, we use a global datastructure recording the
given piece of data imperatively that we retrieve in the try-with handler.
We ensure that such instrumented try-with destroy the data so that there
may not be confusion with another exception. To further harden the correction
of this structure, we also check for pointer equality with the last raised
exception.
The global data structure is not thread-safe for now, which is incorrect as
the STM uses threads and enriched exceptions. Yet, we splitted the patch in
two parts, so that we do not introduce dependencies to the Thread library
immediatly. This will allow to revert only the second patch if ever we
switch to OCaml-coded lightweight threads.
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git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16268 85f007b7-540e-0410-9357-904b9bb8a0f7
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git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16214 85f007b7-540e-0410-9357-904b9bb8a0f7
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information worn by exceptions. The implementation is quite hackish
but it should work nonetheless.
Basically, it adds an additional cell to exceptions arguments, in
which you can put whatever you want. By typing invariants, you may
not reach this cell by normal means, so it should be safe.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16212 85f007b7-540e-0410-9357-904b9bb8a0f7
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Pierre-Marie Pédrot
ppedrot