[PATCH] D32927: [libc++] Implement exception_ptr on Windows

[Eric Fiselier via Phabricator via cfe-commits]

EricWF created this revision.
Herald added a subscriber: mgorny.

This patch implements exception_ptr on Windows using the `__ExceptionPtrFoo` functions provided by MSVC. The `__ExceptionPtrFoo` functions are defined inside the C++ standard library, `msvcprt`, which is unfortunate because it requires libc++ to link to the MSVC STL. However this doesn't seem to cause any immediate problems.

Note there are still 2 outstanding exception_ptr/nested_exception test failures.

- `current_exception.pass.cpp` needs to be rewritten for the Windows exception_ptr semantics which copy the exception every time.
- `rethrow_if_nested.pass.cpp` need investigation. It hits a stack overflow, likely from recursion.

This patch also gets most of the `<future>` tests passing as well.


https://reviews.llvm.org/D32927

Files:
  include/exception
  lib/CMakeLists.txt
  src/exception.cpp
  src/support/runtime/exception_pointer_msvc.ipp
  test/std/language.support/support.exception/except.nested/assign.pass.cpp
  test/std/language.support/support.exception/except.nested/ctor_copy.pass.cpp
  test/std/language.support/support.exception/except.nested/ctor_default.pass.cpp
  test/std/language.support/support.exception/except.nested/rethrow_if_nested.pass.cpp
  test/std/language.support/support.exception/except.nested/rethrow_nested.pass.cpp
  test/std/language.support/support.exception/except.nested/throw_with_nested.pass.cpp
  test/std/language.support/support.exception/propagation/current_exception.pass.cpp
  test/std/language.support/support.exception/propagation/exception_ptr.pass.cpp
  test/std/language.support/support.exception/propagation/make_exception_ptr.pass.cpp
  test/std/language.support/support.exception/propagation/rethrow_exception.pass.cpp

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