Author: Boaz Brickner Date: 2024-11-07T09:05:46+01:00 New Revision: ae5bfa0cef0873d30e7dd5cb20ff4437b244203e
URL: https://github.com/llvm/llvm-project/commit/ae5bfa0cef0873d30e7dd5cb20ff4437b244203e DIFF: https://github.com/llvm/llvm-project/commit/ae5bfa0cef0873d30e7dd5cb20ff4437b244203e.diff LOG: [clang] Output an error when [[lifetimebound]] attribute is applied on a function implicit object parameter while the function returns void (#114203) Fixes: https://github.com/llvm/llvm-project/issues/107556 Added: Modified: clang/docs/ReleaseNotes.rst clang/include/clang/Basic/DiagnosticSemaKinds.td clang/lib/Sema/SemaDecl.cpp clang/test/SemaCXX/attr-lifetimebound.cpp Removed: ################################################################################ diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index d60d88920c6d0f..8deaea77b163c8 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -140,8 +140,8 @@ C++ Specific Potentially Breaking Changes unsigned operator""_udl_name(unsigned long long); - Clang will now produce an error diagnostic when [[clang::lifetimebound]] is - applied on a parameter of a function that returns void. This was previously - ignored and had no effect. (#GH107556) + applied on a parameter or an implicit object parameter of a function that + returns void. This was previously ignored and had no effect. (#GH107556) .. code-block:: c++ diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td index ae3e243bdc58bd..c96a3f6d6e157f 100644 --- a/clang/include/clang/Basic/DiagnosticSemaKinds.td +++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td @@ -10103,9 +10103,12 @@ def err_lifetimebound_no_object_param : Error< def err_lifetimebound_ctor_dtor : Error< "'lifetimebound' attribute cannot be applied to a " "%select{constructor|destructor}0">; -def err_lifetimebound_void_return_type : Error< +def err_lifetimebound_parameter_void_return_type : Error< "'lifetimebound' attribute cannot be applied to a parameter of a function " "that returns void">; +def err_lifetimebound_implicit_object_parameter_void_return_type : Error< + "'lifetimebound' attribute cannot be applied to an implicit object " + "parameter of a function that returns void">; // CHECK: returning address/reference of stack memory def warn_ret_stack_addr_ref : Warning< diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp index cc0019eaf4f021..aba6b555ff28f3 100644 --- a/clang/lib/Sema/SemaDecl.cpp +++ b/clang/lib/Sema/SemaDecl.cpp @@ -6965,6 +6965,11 @@ static void checkAttributesAfterMerging(Sema &S, NamedDecl &ND) { } else if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) { S.Diag(A->getLocation(), diag::err_lifetimebound_ctor_dtor) << isa<CXXDestructorDecl>(MD) << A->getRange(); + } else if (MD->getReturnType()->isVoidType()) { + S.Diag( + MD->getLocation(), + diag:: + err_lifetimebound_implicit_object_parameter_void_return_type); } } } @@ -6976,7 +6981,8 @@ static void checkAttributesAfterMerging(Sema &S, NamedDecl &ND) { // only if the function returns a value. if (auto *A = P->getAttr<LifetimeBoundAttr>()) { if (!isa<CXXConstructorDecl>(FD) && FD->getReturnType()->isVoidType()) { - S.Diag(A->getLocation(), diag::err_lifetimebound_void_return_type); + S.Diag(A->getLocation(), + diag::err_lifetimebound_parameter_void_return_type); } } } diff --git a/clang/test/SemaCXX/attr-lifetimebound.cpp b/clang/test/SemaCXX/attr-lifetimebound.cpp index 804d61fb62ca40..81e9193cf76a04 100644 --- a/clang/test/SemaCXX/attr-lifetimebound.cpp +++ b/clang/test/SemaCXX/attr-lifetimebound.cpp @@ -11,8 +11,7 @@ namespace usage_invalid { int *explicit_object(this A&) [[clang::lifetimebound]]; // expected-error {{explicit object member function has no implicit object parameter}} int not_function [[clang::lifetimebound]]; // expected-error {{only applies to parameters and implicit object parameters}} int [[clang::lifetimebound]] also_not_function; // expected-error {{cannot be applied to types}} - // FIXME: Should diagnose a void return type. - void void_return_member() [[clang::lifetimebound]]; + void void_return_member() [[clang::lifetimebound]]; // expected-error {{'lifetimebound' attribute cannot be applied to an implicit object parameter of a function that returns void}} }; int *attr_with_param(int ¶m [[clang::lifetimebound(42)]]); // expected-error {{takes no arguments}} } _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
