Update copyright years.

[thirdparty/gcc.git] / libstdc++-v3 / libsupc++ / eh_ptr.cc

diff --git a/libstdc++-v3/libsupc++/eh_ptr.cc b/libstdc++-v3/libsupc++/eh_ptr.cc
index 6508749e56ca37f9bada99eea815699e371cabcc..0dc06f3ade6e0c2c9ee1d09ddc414a86bc7e3db2 100644 (file)
--- a/libstdc++-v3/libsupc++/eh_ptr.cc
+++ b/libstdc++-v3/libsupc++/eh_ptr.cc
@@ -1,5 +1,5 @@
 // -*- C++ -*- Implement the members of exception_ptr.
-// Copyright (C) 2008-2014 Free Software Foundation, Inc.
+// Copyright (C) 2008-2020 Free Software Foundation, Inc.
 //
 // This file is part of GCC.
 //
@@ -23,9 +23,7 @@
 // <http://www.gnu.org/licenses/>.
 
 #include <bits/c++config.h>
-#include <bits/atomic_lockfree_defines.h>
-
-#if ATOMIC_INT_LOCK_FREE > 1
+#include "eh_atomics.h"
 
 #define _GLIBCXX_EH_PTR_COMPAT
 
@@ -35,33 +33,59 @@
 
 using namespace __cxxabiv1;
 
-std::__exception_ptr::exception_ptr::exception_ptr() _GLIBCXX_USE_NOEXCEPT
+// Verify assumptions about member layout in exception types
+namespace
+{
+template<typename Ex>
+  constexpr std::size_t unwindhdr()
+  { return offsetof(Ex, unwindHeader); }
+
+template<typename Ex>
+  constexpr std::size_t termHandler()
+  { return unwindhdr<Ex>() - offsetof(Ex, terminateHandler); }
+
+static_assert( termHandler<__cxa_exception>()
+              == termHandler<__cxa_dependent_exception>(),
+              "__cxa_dependent_exception::termHandler layout must be"
+              " consistent with __cxa_exception::termHandler" );
+
+#ifndef __ARM_EABI_UNWINDER__
+template<typename Ex>
+  constexpr std::ptrdiff_t adjptr()
+  { return unwindhdr<Ex>() - offsetof(Ex, adjustedPtr); }
+
+static_assert( adjptr<__cxa_exception>()
+              == adjptr<__cxa_dependent_exception>(),
+              "__cxa_dependent_exception::adjustedPtr layout must be"
+              " consistent with __cxa_exception::adjustedPtr" );
+#endif
+}
+
+std::__exception_ptr::exception_ptr::exception_ptr() noexcept
 : _M_exception_object(0) { }
 
 
-std::__exception_ptr::exception_ptr::exception_ptr(void* obj)
-_GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::exception_ptr(void* obj) noexcept
 : _M_exception_object(obj)  { _M_addref(); }
 
 
-std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool)
-_GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool) noexcept
 : _M_exception_object(0) { }
 
 
 std::__exception_ptr::
-exception_ptr::exception_ptr(const exception_ptr& other) _GLIBCXX_USE_NOEXCEPT
+exception_ptr::exception_ptr(const exception_ptr& other) noexcept
 : _M_exception_object(other._M_exception_object)
 { _M_addref(); }
 
 
-std::__exception_ptr::exception_ptr::~exception_ptr() _GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::~exception_ptr() noexcept
 { _M_release(); }
 
 
 std::__exception_ptr::exception_ptr&
 std::__exception_ptr::
-exception_ptr::operator=(const exception_ptr& other) _GLIBCXX_USE_NOEXCEPT
+exception_ptr::operator=(const exception_ptr& other) noexcept
 {
   exception_ptr(other).swap(*this);
   return *this;
@@ -69,25 +93,25 @@ exception_ptr::operator=(const exception_ptr& other) _GLIBCXX_USE_NOEXCEPT
 
 
 void
-std::__exception_ptr::exception_ptr::_M_addref() _GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::_M_addref() noexcept
 {
   if (_M_exception_object)
     {
       __cxa_refcounted_exception *eh =
        __get_refcounted_exception_header_from_obj (_M_exception_object);
-      __atomic_add_fetch (&eh->referenceCount, 1, __ATOMIC_ACQ_REL);
+      __gnu_cxx::__eh_atomic_inc (&eh->referenceCount);
     }
 }
 
 
 void
-std::__exception_ptr::exception_ptr::_M_release() _GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::_M_release() noexcept
 {
   if (_M_exception_object)
     {
       __cxa_refcounted_exception *eh =
        __get_refcounted_exception_header_from_obj (_M_exception_object);
-      if (__atomic_sub_fetch (&eh->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
+      if (__gnu_cxx::__eh_atomic_dec (&eh->referenceCount))
         {
          if (eh->exc.exceptionDestructor)
            eh->exc.exceptionDestructor (_M_exception_object);
@@ -100,13 +124,12 @@ std::__exception_ptr::exception_ptr::_M_release() _GLIBCXX_USE_NOEXCEPT
 
 
 void*
-std::__exception_ptr::exception_ptr::_M_get() const _GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::_M_get() const noexcept
 { return _M_exception_object; }
 
 
 void
-std::__exception_ptr::exception_ptr::swap(exception_ptr &other)
-  _GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::swap(exception_ptr &other) noexcept
 {
   void *tmp = _M_exception_object;
   _M_exception_object = other._M_exception_object;
@@ -116,27 +139,24 @@ std::__exception_ptr::exception_ptr::swap(exception_ptr &other)
 
 // Retained for compatibility with CXXABI_1.3.
 void
-std::__exception_ptr::exception_ptr::_M_safe_bool_dummy()
-  _GLIBCXX_USE_NOEXCEPT { }
+std::__exception_ptr::exception_ptr::_M_safe_bool_dummy() noexcept { }
 
 
 // Retained for compatibility with CXXABI_1.3.
 bool
-std::__exception_ptr::exception_ptr::operator!() const _GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::operator!() const noexcept
 { return _M_exception_object == 0; }
 
 
 // Retained for compatibility with CXXABI_1.3.
-std::__exception_ptr::exception_ptr::operator __safe_bool() const
-_GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::operator __safe_bool() const noexcept
 {
   return _M_exception_object ? &exception_ptr::_M_safe_bool_dummy : 0;
 }
 
 
 const std::type_info*
-std::__exception_ptr::exception_ptr::__cxa_exception_type() const
-  _GLIBCXX_USE_NOEXCEPT
+std::__exception_ptr::exception_ptr::__cxa_exception_type() const noexcept
 {
   __cxa_exception *eh = __get_exception_header_from_obj (_M_exception_object);
   return eh->exceptionType;
@@ -144,19 +164,17 @@ std::__exception_ptr::exception_ptr::__cxa_exception_type() const
 
 
 bool std::__exception_ptr::operator==(const exception_ptr& lhs,
-                                     const exception_ptr& rhs)
-  _GLIBCXX_USE_NOEXCEPT
+                                     const exception_ptr& rhs) noexcept
 { return lhs._M_exception_object == rhs._M_exception_object; }
 
 
 bool std::__exception_ptr::operator!=(const exception_ptr& lhs,
-                                     const exception_ptr& rhs)
-  _GLIBCXX_USE_NOEXCEPT
+                                     const exception_ptr& rhs) noexcept
 { return !(lhs == rhs);}
 
 
 std::exception_ptr
-std::current_exception() _GLIBCXX_USE_NOEXCEPT
+std::current_exception() noexcept
 {
   __cxa_eh_globals *globals = __cxa_get_globals ();
   __cxa_exception *header = globals->caughtExceptions;
@@ -191,7 +209,7 @@ __gxx_dependent_exception_cleanup(_Unwind_Reason_Code code,
 
   __cxa_free_dependent_exception (dep);
 
-  if (__atomic_sub_fetch (&header->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
+  if (__gnu_cxx::__eh_atomic_dec (&header->referenceCount))
     {
       if (header->exc.exceptionDestructor)
        header->exc.exceptionDestructor (header + 1);
@@ -210,14 +228,17 @@ std::rethrow_exception(std::exception_ptr ep)
 
   __cxa_dependent_exception *dep = __cxa_allocate_dependent_exception ();
   dep->primaryException = obj;
-  __atomic_add_fetch (&eh->referenceCount, 1,  __ATOMIC_ACQ_REL);
+  __gnu_cxx::__eh_atomic_inc (&eh->referenceCount);
 
   dep->unexpectedHandler = get_unexpected ();
   dep->terminateHandler = get_terminate ();
   __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(dep->unwindHeader.exception_class);
   dep->unwindHeader.exception_cleanup = __gxx_dependent_exception_cleanup;
 
-#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
+  __cxa_eh_globals *globals = __cxa_get_globals ();
+  globals->uncaughtExceptions += 1;
+
+#ifdef __USING_SJLJ_EXCEPTIONS__
   _Unwind_SjLj_RaiseException (&dep->unwindHeader);
 #else
   _Unwind_RaiseException (&dep->unwindHeader);
@@ -229,5 +250,3 @@ std::rethrow_exception(std::exception_ptr ep)
 }
 
 #undef _GLIBCXX_EH_PTR_COMPAT
-
-#endif