[p0012] Implement ABI support for throwing a noexcept function pointer and

catching as non-noexcept

This implements the following proposal from cxx-abi-dev:

http://sourcerytools.com/pipermail/cxx-abi-dev/2016-October/002988.html

... which is necessary for complete support of http://wg21.link/p0012,
specifically throwing noexcept function and member function pointers and
catching them as non-noexcept pointers.

Differential Review: https://reviews.llvm.org/D26178


git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@285867 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 68 insertions, 0 deletions

diff --git a/test/catch_member_function_pointer_02.pass.cpp b/test/catch_member_function_pointer_02.pass.cpp
new file mode 100644
index 0000000..860d8ed
--- /dev/null
+++ b/test/catch_member_function_pointer_02.pass.cpp
@@ -0,0 +1,68 @@
+//===--------------- catch_member_function_pointer_02.cpp -----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// Can a noexcept member function pointer be caught by a non-noexcept catch
+// clause?
+// UNSUPPORTED: c++98, c++03, c++11, c++14
+// UNSUPPORTED: libcxxabi-no-exceptions, libcxxabi-no-qualified-function-types
+
+#include <cassert>
+
+struct X {
+  template<bool Noexcept> void f() noexcept(Noexcept) {}
+};
+template<bool Noexcept> using FnType = void (X::*)() noexcept(Noexcept);
+
+template<bool ThrowNoexcept, bool CatchNoexcept>
+void check()
+{
+    try
+    {
+        auto p = &X::f<ThrowNoexcept>;
+        throw p;
+        assert(false);
+    }
+    catch (FnType<CatchNoexcept> p)
+    {
+        assert(ThrowNoexcept || !CatchNoexcept);
+        assert(p == &X::f<ThrowNoexcept>);
+    }
+    catch (...)
+    {
+        assert(!ThrowNoexcept && CatchNoexcept);
+    }
+}
+
+void check_deep() {
+    FnType<true> p = &X::f<true>;
+    try
+    {
+        throw &p;
+    }
+    catch (FnType<false> *q)
+    {
+        assert(false);
+    }
+    catch (FnType<true> *q)
+    {
+    }
+    catch (...)
+    {
+        assert(false);
+    }
+}
+
+int main()
+{
+    check<false, false>();
+    check<false, true>();
+    check<true, false>();
+    check<true, true>();
+    check_deep();
+}