nwilson created this revision.
nwilson added reviewers: rsmith, faisalv, hubert.reinterpretcast, aaron.ballman.
nwilson added a subscriber: cfe-commits.
Adding checks and diagnostics which fall under Concepts TS[dcl.spec.concept]p5:
function concepts are required to have 'bool' return type.
Adding checks and diagnostics which fall under Concepts TS[dcl.spec.concept]p6:
variable concepts are required to have 'bool' declaration type.
Remove a test in Parser which caused a regression due to the new checks.
http://reviews.llvm.org/D16163
Files:
include/clang/Basic/DiagnosticSemaKinds.td
lib/Sema/SemaDecl.cpp
test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p5.cpp
test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p6.cpp
test/Parser/cxx-concept-declaration.cpp
Index: test/Parser/cxx-concept-declaration.cpp
===================================================================
--- test/Parser/cxx-concept-declaration.cpp
+++ test/Parser/cxx-concept-declaration.cpp
@@ -13,9 +13,6 @@
template<int N>
A<void>::Boolean concept C3(!0);
-template<typename T, int = 0>
-concept auto C4(void) -> bool { return true; }
-
constexpr int One = 1;
template <typename>
Index: test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p6.cpp
===================================================================
--- /dev/null
+++ test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p6.cpp
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -std=c++14 -fconcepts-ts -x c++ -verify %s
+
+template<typename T>
+concept bool vc { true };
+
+template<typename T>
+struct B { typedef bool Boolean; };
+
+template<int N>
+B<void>::Boolean concept vctb(!0);
+
+template<typename T>
+concept int vcti { 5 }; // expected-error {{declared type of variable concept must be 'bool'}}
+
+template<typename T>
+concept float vctf { 5.5 }; // expected-error {{declared type of variable concept must be 'bool'}}
+
+template<typename T>
+concept auto vcta { true }; // expected-error {{declared type of variable concept must be 'bool'}}
+
+template<typename T>
+concept decltype(auto) vctd { true }; // expected-error {{declared type of variable concept must be 'bool'}}
Index: test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p5.cpp
===================================================================
--- test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p5.cpp
+++ test/CXX/concepts-ts/dcl.dcl/dcl.spec/dcl.spec.concept/p5.cpp
@@ -11,3 +11,15 @@
template<typename T>
concept bool fcpva(...) { return true; } // expected-error {{function concept cannot have any parameters}}
+
+template<typename T>
+concept int fcrti() { return 5; } // expected-error {{declared return type of function concept must be 'bool'}}
+
+template<typename T>
+concept float fcrtf() { return 5.5; } // expected-error {{declared return type of function concept must be 'bool'}}
+
+template<typename T>
+concept auto fcrta(void) -> bool { return true; } // expected-error {{declared return type of function concept must be 'bool'}}
+
+template<typename T>
+concept decltype(auto) fcrtd(void) { return true; } // expected-error {{declared return type of function concept must be 'bool'}}
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -5986,6 +5986,17 @@
<< 0 << 3;
NewVD->setInvalidDecl(true);
}
+
+ // C++ Concepts TS [dcl.spec.concept]p6: A variable concept has the
+ // following restrictions:
+ // - The declared type shall have the type bool.
+ if (!R->isBooleanType()) {
+ SourceRange Range = D.getDeclSpec().getTypeSpecTypeLoc();
+ Diag(D.getIdentifierLoc(), diag::err_variable_concept_bool_decl)
+ << (Range.isValid() ? FixItHint::CreateReplacement(Range, "bool")
+ : FixItHint());
+ NewVD->setInvalidDecl(true);
+ }
}
}
@@ -7668,6 +7679,18 @@
// C++ Concepts TS [dcl.spec.concept]p5: A function concept has the
// following restrictions:
+ // - The declared return type shall have the type bool.
+ if (!FPT->getReturnType()->isBooleanType() ||
+ D.getDeclSpec().containsPlaceholderType()) {
+ SourceRange Range = NewFD->getReturnTypeSourceRange();
+ Diag(D.getIdentifierLoc(), diag::err_function_concept_bool_ret)
+ << (Range.isValid() ? FixItHint::CreateReplacement(Range, "bool")
+ : FixItHint());
+ NewFD->setInvalidDecl();
+ }
+
+ // C++ Concepts TS [dcl.spec.concept]p5: A function concept has the
+ // following restrictions:
// - The declaration's parameter list shall be equivalent to an empty
// parameter list.
if (FPT->getNumParams() > 0 || FPT->isVariadic())
Index: include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- include/clang/Basic/DiagnosticSemaKinds.td
+++ include/clang/Basic/DiagnosticSemaKinds.td
@@ -2067,6 +2067,10 @@
"'%select{thread_local|inline|friend|constexpr}1'">;
def err_function_concept_with_params : Error<
"function concept cannot have any parameters">;
+def err_function_concept_bool_ret : Error<
+ "declared return type of function concept must be 'bool'">;
+def err_variable_concept_bool_decl : Error<
+ "declared type of variable concept must be 'bool'">;
// C++11 char16_t/char32_t
def warn_cxx98_compat_unicode_type : Warning<
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