[PATCH] D105478: [clang] Make CXXRecrdDecl invalid if it contains any undeduced fields.

[Adam Czachorowski via Phabricator via cfe-commits]

adamcz updated this revision to Diff 363495.
adamcz added a comment.

ActOnInializerError instead of SetInvalidDecl


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D105478/new/

https://reviews.llvm.org/D105478

Files:
  clang/lib/Parse/ParseDeclCXX.cpp
  clang/test/AST/ast-dump-undeduced-expr.cpp
  clang/test/SemaCXX/crash-auto-36064.cpp
  clang/test/SemaCXX/cxx11-crashes.cpp


Index: clang/test/SemaCXX/cxx11-crashes.cpp
===================================================================
--- clang/test/SemaCXX/cxx11-crashes.cpp
+++ clang/test/SemaCXX/cxx11-crashes.cpp
@@ -104,3 +104,22 @@
   bool baz() { return __has_nothrow_constructor(B); }
   bool qux() { return __has_nothrow_copy(B); }
 }
+
+namespace undeduced_field {
+template<class T>
+struct Foo {
+  typedef T type;
+};
+
+struct Bar {
+  Bar();
+  // The missing expression makes A undeduced.
+  static constexpr auto A = ;  // expected-error {{expected expression}}
+                               // expected-error at -1 {{declaration of variable 'A' with deduced type 'const auto' requires an initializer}}
+
+  Foo<decltype(A)>::type B;  // The type of B is also undeduced (wrapped in Elaborated).
+};
+
+// This used to crash when trying to get the layout of B.
+Bar x;
+}
Index: clang/test/SemaCXX/crash-auto-36064.cpp
===================================================================
--- clang/test/SemaCXX/crash-auto-36064.cpp
+++ clang/test/SemaCXX/crash-auto-36064.cpp
@@ -1,8 +1,9 @@
 // RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -verify
-template <typename A, decltype(new A)> // expected-error{{new expression for type 'auto' requires a constructor argument}}
+template <typename A, decltype(new A)>
 struct b;
 struct d {
   static auto c = ;              // expected-error{{expected expression}}
+                                 // expected-error at -1 {{declaration of variable 'c' with deduced type 'auto' requires an initializer}}
+
   decltype(b<decltype(c), int>); // expected-error{{expected '(' for function-style cast or type construction}}
-                                 // expected-note at -1{{while substituting prior template arguments into non-type template parameter [with A = auto]}}
 };
Index: clang/test/AST/ast-dump-undeduced-expr.cpp
===================================================================
--- /dev/null
+++ clang/test/AST/ast-dump-undeduced-expr.cpp
@@ -0,0 +1,7 @@
+// RUN: not %clang_cc1 -triple x86_64-unknown-unknown -ast-dump %s | FileCheck %s
+
+struct Foo {
+  static constexpr auto Bar = ;
+};
+
+// CHECK: -VarDecl {{.*}} invalid Bar 'const auto' static constexpr
Index: clang/lib/Parse/ParseDeclCXX.cpp
===================================================================
--- clang/lib/Parse/ParseDeclCXX.cpp
+++ clang/lib/Parse/ParseDeclCXX.cpp
@@ -2989,9 +2989,11 @@
       ExprResult Init = ParseCXXMemberInitializer(
           ThisDecl, DeclaratorInfo.isDeclarationOfFunction(), EqualLoc);
 
-      if (Init.isInvalid())
+      if (Init.isInvalid()) {
+        if (ThisDecl)
+          Actions.ActOnUninitializedDecl(ThisDecl);
         SkipUntil(tok::comma, StopAtSemi | StopBeforeMatch);
-      else if (ThisDecl)
+      } else if (ThisDecl)
         Actions.AddInitializerToDecl(ThisDecl, Init.get(), EqualLoc.isInvalid());
     } else if (ThisDecl && DS.getStorageClassSpec() == DeclSpec::SCS_static)
       // No initializer.


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