forked from OSchip/llvm-project
135 lines
6.2 KiB
C++
135 lines
6.2 KiB
C++
// RUN: %llvmgxx -S %s -o - -O2 | FileCheck %s
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namespace boost {
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namespace detail {
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template <typename T> struct cv_traits_imp {};
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template <typename T> struct cv_traits_imp<T*> {typedef T unqualified_type;};
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}
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}
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namespace mpl_ {}
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namespace boost {
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namespace mpl {using namespace mpl_;}
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template< typename T > struct remove_cv {typedef typename boost::detail::cv_traits_imp<T*>::unqualified_type type;};
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namespace type_traits {
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typedef char yes_type;
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struct no_type {char padding[8];};
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}
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}
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namespace mpl_ {
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template< bool C_ > struct bool_;
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typedef bool_<true> true_;
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typedef bool_<false> false_;
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template< bool C_ > struct bool_ {static const bool value = C_;};
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template< typename T, T N > struct integral_c;
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}
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namespace boost{
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template <class T, T val> struct integral_constant :
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public mpl::integral_c<T, val> {};
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template<> struct integral_constant<bool,true> : public mpl::true_ {};
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template<> struct integral_constant<bool,false> : public mpl::false_ {};
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namespace type_traits {
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template <bool b1, bool b2, bool b3 = false, bool b4 = false,
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bool b5 = false, bool b6 = false, bool b7 = false> struct ice_or;
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template <bool b1, bool b2, bool b3, bool b4, bool b5, bool b6, bool b7>
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struct ice_or {static const bool value = true; };
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template <> struct ice_or<false, false, false, false, false, false, false>
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{static const bool value = false;};
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template <bool b1, bool b2, bool b3 = true, bool b4 = true, bool b5 = true,
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bool b6 = true, bool b7 = true> struct ice_and;
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template <bool b1, bool b2, bool b3, bool b4, bool b5, bool b6, bool b7>
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struct ice_and {static const bool value = false;};
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template <> struct ice_and<true, true, true, true, true, true, true>
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{static const bool value = true;};
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template <bool b> struct ice_not {static const bool value = true;};
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};
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namespace detail {
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template <typename T> struct is_union_impl {static const bool value = false;};
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}
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template< typename T > struct is_union :
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::boost::integral_constant<bool, ::boost::detail::is_union_impl<T>::value> {};
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namespace detail {
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template <class U> ::boost::type_traits::yes_type is_class_tester(void(U::*)(void));
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template <class U> ::boost::type_traits::no_type is_class_tester(...);
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template <typename T> struct is_class_impl {
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static const bool value = (::boost::type_traits::ice_and< sizeof(is_class_tester<T>(0))
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== sizeof(::boost::type_traits::yes_type),
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::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value >::value);};
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}
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template<typename T> struct is_class:
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::boost::integral_constant<bool,::boost::detail::is_class_impl<T>::value> { };
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namespace detail {
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template <typename T> struct empty_helper_t1: public T {int i[256];};
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struct empty_helper_t2 {int i[256];};
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template <typename T, bool is_a_class = false> struct empty_helper
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{static const bool value = false;};
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template <typename T> struct empty_helper<T, true>
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{static const bool value = (sizeof(empty_helper_t1<T>) == sizeof(empty_helper_t2));};
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template <typename T> struct is_empty_impl {
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typedef typename remove_cv<T>::type cvt;
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static const bool value = (::boost::type_traits::ice_or< ::boost::detail::empty_helper
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<cvt,::boost::is_class<T>::value>::value, false>::value);
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};
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}
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template<typename T> struct is_empty:
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::boost::integral_constant<bool,::boost::detail::is_empty_impl<T>::value> {};
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template<typename T, typename U > struct is_same:
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::boost::integral_constant<bool,false> {};
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template<typename T> struct call_traits {typedef T& reference;};
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namespace details {
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template <class T1, class T2, bool IsSame, bool FirstEmpty, bool SecondEmpty>
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struct compressed_pair_switch;
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template <class T1, class T2>
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struct compressed_pair_switch<T1, T2, false, true, false>
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{static const int value = 1;};
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template <class T1, class T2, int Version> class compressed_pair_imp;
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template <class T1, class T2> class compressed_pair_imp<T1, T2, 1>:
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protected ::boost::remove_cv<T1>::type {
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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first_reference first() {return *this;}
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second_reference second() {return second_;}
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second_type second_;
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};
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}
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template <class T1, class T2> class compressed_pair:
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private ::boost::details::compressed_pair_imp<T1, T2, ::boost::details::compressed_pair_switch<
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T1, T2, ::boost::is_same<typename remove_cv<T1>::type,
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typename remove_cv<T2>::type>::value,
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::boost::is_empty<T1>::value, ::boost::is_empty<T2>::value>::value>
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{
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private:
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typedef details::compressed_pair_imp<T1, T2, ::boost::details::compressed_pair_switch<
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T1, T2, ::boost::is_same<typename remove_cv<T1>::type,
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typename remove_cv<T2>::type>::value,
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::boost::is_empty<T1>::value, ::boost::is_empty<T2>::value>::value> base;
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public:
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typedef T1 first_type;
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typedef T2 second_type;
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typedef typename call_traits<first_type>::reference first_reference;
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typedef typename call_traits<second_type>::reference second_reference;
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first_reference first() {return base::first();}
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second_reference second() {return base::second();}
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};
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}
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struct empty_base_t {};
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struct empty_t : empty_base_t {};
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typedef boost::compressed_pair<empty_t, int> data_t;
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extern "C" {int printf(const char * , ...);}
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extern "C" {void abort(void);}
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int main (int argc, char * const argv[]) {
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data_t x;
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x.second() = -3;
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// This store should be elided:
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x.first() = empty_t();
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// If x.second() has been clobbered by the elided store, fail.
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if (x.second() != -3) {
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printf("x.second() was clobbered\n");
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// CHECK-NOT: x.second() was clobbered
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abort();
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}
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return 0;
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}
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// CHECK: ret i32
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