Fix ABI compatibility of `<stdexcept>` with VCRuntime.

Summary:
Currently, libc++'s `<stdexcept>` doesn't play nice with `vcruntime`. Specifically:

* `logic_error` and `runtime_error` have a different layout.
* libc++'s `logic_error` and `runtime_error` override `what()` but `vcruntime` does not.
*  `vcruntime` uses weak vtables for `<stdexcept>` types.
* libc++'s `<stdexcept>` constructors and assignment operators may have different manglings than `vcruntimes`.

This patch makes libc++'s declarations in `<stdexcept>` match those provided by MSVC's STL as closely as possible.
If MSVC doesn't declare a special member, then neither do we. This ensures that the implicit definitions have the same linkage, visibility, triviality, and noexcept-ness.







Reviewers: thomasanderson, ldionne, smeenai

Reviewed By: thomasanderson

Subscribers: jdoerfert, libcxx-commits

Differential Revision: https://reviews.llvm.org/D58945

llvm-svn: 355546

1 files changed, 4 insertions, 81 deletions

diff --git a/libcxx/src/stdexcept.cpp b/libcxx/src/stdexcept.cpp
index 1507062..f8f335f3 100644
--- a/libcxx/src/stdexcept.cpp
+++ b/libcxx/src/stdexcept.cpp
@@ -10,87 +10,10 @@
 #include "new"
 #include "string"
 #include "system_error"
-#include "include/refstring.h"
 
-/* For _LIBCPPABI_VERSION */
-#if !defined(_LIBCPP_BUILDING_HAS_NO_ABI_LIBRARY) && \
-    (defined(LIBCXX_BUILDING_LIBCXXABI) || defined(__APPLE__) || defined(LIBCXXRT))
-#include <cxxabi.h>
-#endif
-
-static_assert(sizeof(std::__libcpp_refstring) == sizeof(const char *), "");
-
-
-namespace std  // purposefully not using versioning namespace
-{
-
-logic_error::logic_error(const string& msg) : __imp_(msg.c_str())
-{
-}
-
-logic_error::logic_error(const char* msg) : __imp_(msg)
-{
-}
-
-logic_error::logic_error(const logic_error& le) _NOEXCEPT : __imp_(le.__imp_)
-{
-}
-
-logic_error&
-logic_error::operator=(const logic_error& le) _NOEXCEPT
-{
-    __imp_ = le.__imp_;
-    return *this;
-}
-
-runtime_error::runtime_error(const string& msg) : __imp_(msg.c_str())
-{
-}
-
-runtime_error::runtime_error(const char* msg) : __imp_(msg)
-{
-}
-
-runtime_error::runtime_error(const runtime_error& le) _NOEXCEPT
-  : __imp_(le.__imp_)
-{
-}
-
-runtime_error&
-runtime_error::operator=(const runtime_error& le) _NOEXCEPT
-{
-    __imp_ = le.__imp_;
-    return *this;
-}
-
-#if !defined(_LIBCPPABI_VERSION) && !defined(LIBSTDCXX)
-
-const char*
-logic_error::what() const _NOEXCEPT
-{
-    return __imp_.c_str();
-}
-
-const char*
-runtime_error::what() const _NOEXCEPT
-{
-    return __imp_.c_str();
-}
-
-#if !defined(_LIBCPP_ABI_VCRUNTIME)
-
-logic_error::~logic_error() _NOEXCEPT {}
-domain_error::~domain_error() _NOEXCEPT {}
-invalid_argument::~invalid_argument() _NOEXCEPT {}
-length_error::~length_error() _NOEXCEPT {}
-out_of_range::~out_of_range() _NOEXCEPT {}
-
-runtime_error::~runtime_error() _NOEXCEPT {}
-range_error::~range_error() _NOEXCEPT {}
-overflow_error::~overflow_error() _NOEXCEPT {}
-underflow_error::~underflow_error() _NOEXCEPT {}
 
+#ifdef _LIBCPP_ABI_VCRUNTIME
+#include "support/runtime/stdexcept_vcruntime.ipp"
+#else
+#include "support/runtime/stdexcept_default.ipp"
 #endif
-#endif
-
-}  // std