r201620 - PR13110: Add a -Wignored-qualifiers warning when ignoring a const, volatile, or
Rafael Espíndola
rafael.espindola at gmail.com
Tue Feb 18 19:28:01 PST 2014
Looks like this fires quiet a bit in llvm itself:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux/builds/6821/steps/build%2064-bit%20llvm%20using%20clang/logs/stdio
On 18 February 2014 19:13, Richard Smith <richard-llvm at metafoo.co.uk> wrote:
> Author: rsmith
> Date: Tue Feb 18 18:13:27 2014
> New Revision: 201620
>
> URL: http://llvm.org/viewvc/llvm-project?rev=201620&view=rev
> Log:
> PR13110: Add a -Wignored-qualifiers warning when ignoring a const, volatile, or
> _Atomic qualifier applied to a reference type.
>
> Modified:
> cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
> cfe/trunk/lib/Sema/SemaType.cpp
> cfe/trunk/test/CXX/dcl.decl/dcl.meaning/dcl.ref/p6-0x.cpp
> cfe/trunk/test/CXX/drs/dr1xx.cpp
> cfe/trunk/test/Parser/cxx-reference.cpp
> cfe/trunk/test/Parser/cxx0x-rvalue-reference.cpp
> cfe/trunk/test/SemaCXX/references.cpp
>
> Modified: cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td?rev=201620&r1=201619&r2=201620&view=diff
> ==============================================================================
> --- cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td (original)
> +++ cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td Tue Feb 18 18:13:27 2014
> @@ -3787,6 +3787,9 @@ def warn_typecheck_negative_array_new_si
> InGroup<BadArrayNewLength>;
> def warn_typecheck_function_qualifiers : Warning<
> "qualifier on function type %0 has unspecified behavior">;
> +def warn_typecheck_reference_qualifiers : Warning<
> + "'%0' qualifier on reference type %1 has no effect">,
> + InGroup<IgnoredQualifiers>;
> def err_typecheck_invalid_restrict_not_pointer : Error<
> "restrict requires a pointer or reference (%0 is invalid)">;
> def err_typecheck_invalid_restrict_not_pointer_noarg : Error<
>
> Modified: cfe/trunk/lib/Sema/SemaType.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaType.cpp?rev=201620&r1=201619&r2=201620&view=diff
> ==============================================================================
> --- cfe/trunk/lib/Sema/SemaType.cpp (original)
> +++ cfe/trunk/lib/Sema/SemaType.cpp Tue Feb 18 18:13:27 2014
> @@ -1117,17 +1117,32 @@ static QualType ConvertDeclSpecToType(Ty
> }
> }
>
> - // C++ [dcl.ref]p1:
> + // C++11 [dcl.ref]p1:
> // Cv-qualified references are ill-formed except when the
> - // cv-qualifiers are introduced through the use of a typedef
> - // (7.1.3) or of a template type argument (14.3), in which
> - // case the cv-qualifiers are ignored.
> - // FIXME: Shouldn't we be checking SCS_typedef here?
> + // cv-qualifiers are introduced through the use of a typedef-name
> + // or decltype-specifier, in which case the cv-qualifiers are ignored.
> + //
> + // There don't appear to be any other contexts in which a cv-qualified
> + // reference type could be formed, so the 'ill-formed' clause here appears
> + // to never happen.
> if (DS.getTypeSpecType() == DeclSpec::TST_typename &&
> TypeQuals && Result->isReferenceType()) {
> - TypeQuals &= ~DeclSpec::TQ_const;
> - TypeQuals &= ~DeclSpec::TQ_volatile;
> - TypeQuals &= ~DeclSpec::TQ_atomic;
> + // If this occurs outside a template instantiation, warn the user about
> + // it; they probably didn't mean to specify a redundant qualifier.
> + std::pair<DeclSpec::TQ, SourceLocation> Quals[] = {
> + { DeclSpec::TQ_const, DS.getConstSpecLoc() },
> + { DeclSpec::TQ_volatile, DS.getVolatileSpecLoc() },
> + { DeclSpec::TQ_atomic, DS.getAtomicSpecLoc() }
> + };
> + for (unsigned I = 0, N = llvm::array_lengthof(Quals); I != N; ++I) {
> + if (S.ActiveTemplateInstantiations.empty()) {
> + if (TypeQuals & Quals[I].first)
> + S.Diag(Quals[I].second, diag::warn_typecheck_reference_qualifiers)
> + << DeclSpec::getSpecifierName(Quals[I].first) << Result
> + << FixItHint::CreateRemoval(Quals[I].second);
> + }
> + TypeQuals &= ~Quals[I].first;
> + }
> }
>
> // C90 6.5.3 constraints: "The same type qualifier shall not appear more
>
> Modified: cfe/trunk/test/CXX/dcl.decl/dcl.meaning/dcl.ref/p6-0x.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/dcl.decl/dcl.meaning/dcl.ref/p6-0x.cpp?rev=201620&r1=201619&r2=201620&view=diff
> ==============================================================================
> --- cfe/trunk/test/CXX/dcl.decl/dcl.meaning/dcl.ref/p6-0x.cpp (original)
> +++ cfe/trunk/test/CXX/dcl.decl/dcl.meaning/dcl.ref/p6-0x.cpp Tue Feb 18 18:13:27 2014
> @@ -1,5 +1,4 @@
> // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
> -// expected-no-diagnostics
>
> template<typename T, typename U>
> struct is_same {
> @@ -20,8 +19,8 @@ typedef int& LRI;
> typedef int&& RRI;
>
> typedef LRI& r1; CHECK_EQUAL_TYPES(r1, int&);
> -typedef const LRI& r2; CHECK_EQUAL_TYPES(r2, int&);
> -typedef const LRI&& r3; CHECK_EQUAL_TYPES(r3, int&);
> +typedef const LRI& r2; CHECK_EQUAL_TYPES(r2, int&); // expected-warning {{'const' qualifier on reference type 'LRI' (aka 'int &') has no effect}}
> +typedef const LRI&& r3; CHECK_EQUAL_TYPES(r3, int&); // expected-warning {{'const' qualifier on reference type 'LRI' (aka 'int &') has no effect}}
>
> typedef RRI& r4; CHECK_EQUAL_TYPES(r4, int&);
> typedef RRI&& r5; CHECK_EQUAL_TYPES(r5, int&&);
>
> Modified: cfe/trunk/test/CXX/drs/dr1xx.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/drs/dr1xx.cpp?rev=201620&r1=201619&r2=201620&view=diff
> ==============================================================================
> --- cfe/trunk/test/CXX/drs/dr1xx.cpp (original)
> +++ cfe/trunk/test/CXX/drs/dr1xx.cpp Tue Feb 18 18:13:27 2014
> @@ -40,13 +40,13 @@ namespace dr102 { // dr102: yes
> namespace dr106 { // dr106: sup 540
> typedef int &r1;
> typedef r1 &r1;
> - typedef const r1 r1;
> - typedef const r1 &r1;
> + typedef const r1 r1; // expected-warning {{has no effect}}
> + typedef const r1 &r1; // expected-warning {{has no effect}}
>
> typedef const int &r2;
> typedef r2 &r2;
> - typedef const r2 r2;
> - typedef const r2 &r2;
> + typedef const r2 r2; // expected-warning {{has no effect}}
> + typedef const r2 &r2; // expected-warning {{has no effect}}
> }
>
> namespace dr107 { // dr107: yes
>
> Modified: cfe/trunk/test/Parser/cxx-reference.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Parser/cxx-reference.cpp?rev=201620&r1=201619&r2=201620&view=diff
> ==============================================================================
> --- cfe/trunk/test/Parser/cxx-reference.cpp (original)
> +++ cfe/trunk/test/Parser/cxx-reference.cpp Tue Feb 18 18:13:27 2014
> @@ -10,7 +10,7 @@ void foo(int &a) {
>
> typedef int & A;
>
> -void g(const A aref) {
> +void g(const A aref) { // expected-warning {{'const' qualifier on reference type 'A' (aka 'int &') has no effect}}
> }
>
> int & const X = val; // expected-error {{'const' qualifier may not be applied to a reference}}
>
> Modified: cfe/trunk/test/Parser/cxx0x-rvalue-reference.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Parser/cxx0x-rvalue-reference.cpp?rev=201620&r1=201619&r2=201620&view=diff
> ==============================================================================
> --- cfe/trunk/test/Parser/cxx0x-rvalue-reference.cpp (original)
> +++ cfe/trunk/test/Parser/cxx0x-rvalue-reference.cpp Tue Feb 18 18:13:27 2014
> @@ -3,7 +3,7 @@
> int && r1(int &&a);
>
> typedef int && R;
> -void r2(const R a) {
> +void r2(const R a) { // expected-warning {{'const' qualifier on reference type 'R' (aka 'int &&') has no effect}}
> int & &&ar = a; // expected-error{{'ar' declared as a reference to a reference}}
> }
>
>
> Modified: cfe/trunk/test/SemaCXX/references.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/references.cpp?rev=201620&r1=201619&r2=201620&view=diff
> ==============================================================================
> --- cfe/trunk/test/SemaCXX/references.cpp (original)
> +++ cfe/trunk/test/SemaCXX/references.cpp Tue Feb 18 18:13:27 2014
> @@ -85,9 +85,19 @@ void test8(int& const,// expected-error{
> typedef int& intref;
> typedef intref& intrefref; // C++ DR 106: reference collapsing
>
> - typedef intref const intref_c; // okay. FIXME: how do we verify that this is the same type as intref?
> + typedef intref const intref_c; // expected-warning {{'const' qualifier on reference type 'intref' (aka 'int &') has no effect}}
> + typedef intref_c intref; // ok, same type
> +
> + typedef intref volatile intref; // expected-warning {{'volatile' qualifier on reference type 'intref' (aka 'int &') has no effect}}
> + typedef intref _Atomic intref; // expected-warning {{'_Atomic' qualifier on reference type 'intref' (aka 'int &') has no effect}}
> +
> + void restrict_ref(__restrict intref); // ok
> + void restrict_ref(int &__restrict); // ok
> }
>
> +template<typename T> int const_param(const T) {}
> +int const_ref_param = const_param<int&>(const_ref_param); // no-warning
> +
>
> class string {
> char *Data;
>
>
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