Author: vedantk
Date: Wed Feb 15 19:20:00 2017
New Revision: 295266
URL: http://llvm.org/viewvc/llvm-project?rev=295266&view=rev
Log:
[Sema] Add lvalue-to-rvalue cast in direct-list-initialization of enum
After r264564, we allowed direct-list-initialization of an enum from an
integral value in C++1z mode, so long as that value can convert to the
enum's underlying type.
In this kind of initialization, we need a lvalue-to-rvalue conversion
for the initializer value if it is not a rvalue. This lets us accept the
following code:
enum class A : unsigned {};
A foo(unsigned x) { return A{x}; }
Differential Revision: https://reviews.llvm.org/D29723
Modified:
cfe/trunk/lib/Sema/SemaInit.cpp
cfe/trunk/test/CXX/dcl.decl/dcl.init/dcl.init.list/p3.cpp
Modified: cfe/trunk/lib/Sema/SemaInit.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaInit.cpp?rev=295266&r1=295265&r2=295266&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaInit.cpp (original)
+++ cfe/trunk/lib/Sema/SemaInit.cpp Wed Feb 15 19:20:00 2017
@@ -3981,6 +3981,8 @@ static void TryListInitialization(Sema &
ImplicitConversionSequence ICS;
ICS.setStandard();
ICS.Standard.setAsIdentityConversion();
+ if (!E->isRValue())
+ ICS.Standard.First = ICK_Lvalue_To_Rvalue;
// If E is of a floating-point type, then the conversion is ill-formed
// due to narrowing, but go through the motions in order to produce the
// right diagnostic.
Modified: cfe/trunk/test/CXX/dcl.decl/dcl.init/dcl.init.list/p3.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/dcl.decl/dcl.init/dcl.init.list/p3.cpp?rev=295266&r1=295265&r2=295266&view=diff
==============================================================================
--- cfe/trunk/test/CXX/dcl.decl/dcl.init/dcl.init.list/p3.cpp (original)
+++ cfe/trunk/test/CXX/dcl.decl/dcl.init/dcl.init.list/p3.cpp Wed Feb 15
19:20:00 2017
@@ -150,35 +150,44 @@ namespace cxx1z_direct_enum_init {
void f(T);
f(T{0});
+
+ char c;
+ auto t3 = T{c};
}
#if __cplusplus <= 201402L
- // expected-error@-15 5{{cannot initialize}}
- // expected-error@-15 5{{cannot initialize}}
- // expected-error@-15 5{{cannot initialize}}
+ // expected-error@-18 5{{cannot initialize}}
+ // expected-error@-18 5{{cannot initialize}}
+ // expected-error@-18 5{{cannot initialize}}
+ //
//
+ // expected-error@-18 5{{cannot initialize}}
//
- // expected-error@-15 5{{cannot initialize}}
+ // expected-error@-18 5{{cannot initialize}}
//
- // expected-error@-15 5{{cannot initialize}}
+ // expected-error@-18 5{{cannot initialize}}
//
- // expected-error@-15 5{{cannot initialize}}
//
+ // expected-error@-18 5{{cannot initialize}}
//
- // expected-error@-15 5{{cannot initialize}}
+ //
+ // expected-error@-18 5{{cannot initialize}}
#else
- // expected-error@-29 {{cannot initialize}}
- // expected-error@-29 {{cannot initialize}}
- // expected-error@-29 {{cannot initialize}}
+ // expected-error@-35 {{cannot initialize}}
+ // expected-error@-35 {{cannot initialize}}
+ // expected-error@-35 {{cannot initialize}}
+ //
//
+ // expected-error@-35 {{cannot initialize}}
//
- // expected-error@-29 {{cannot initialize}}
+ // expected-error@-35 {{cannot initialize}}
//
- // expected-error@-29 {{cannot initialize}}
+ // expected-error@-35 {{cannot initialize}}
//
- // expected-error@-29 {{cannot initialize}}
//
+ // expected-error@-35 {{cannot initialize}}
//
- // expected-error@-29 {{cannot initialize}}
+ //
+ // expected-error@-35 {{cannot initialize}}
#endif
template<typename T> void bad() {
@@ -252,4 +261,12 @@ namespace cxx1z_direct_enum_init {
(void)B{0.0}; // expected-error {{type 'double' cannot be narrowed}}
#endif
}
+
+#if __cplusplus > 201402L
+ enum class F : unsigned {};
+ F f1(unsigned x) { return F{x}; }
+ F f2(const unsigned x) { return F{x}; }
+ F f3(bool x) { return F{x}; }
+ F f4(const bool x) { return F{x}; }
+#endif
}
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