[clang] 196cc96 - [clang] Allow LifetimeExtendedTemporary to have no access specifier

[Adam Czachorowski via cfe-commits]

Author: Adam Czachorowski
Date: 2021-01-18T19:19:57+01:00
New Revision: 196cc96f9a643d1cb828f48ef15ec30d0de24df7

URL: https://github.com/llvm/llvm-project/commit/196cc96f9a643d1cb828f48ef15ec30d0de24df7
DIFF: https://github.com/llvm/llvm-project/commit/196cc96f9a643d1cb828f48ef15ec30d0de24df7.diff

LOG: [clang] Allow LifetimeExtendedTemporary to have no access specifier

The check only runs in debug mode during serialization, but
assert()-fail on:
  struct S { const int& x = 7; };
in C++ mode.

Differential Revision: https://reviews.llvm.org/D94804

Added: 
    

Modified: 
    clang/lib/AST/DeclBase.cpp
    clang/test/PCH/cxx-reference.h

Removed: 
    


################################################################################
diff  --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index 0656efae5489..dc59f3dd1f15 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -971,21 +971,19 @@ bool Decl::AccessDeclContextSanity() const {
   // 5. it's invalid
   // 6. it's a C++0x static_assert.
   // 7. it's a block literal declaration
-  if (isa<TranslationUnitDecl>(this) ||
-      isa<TemplateTypeParmDecl>(this) ||
-      isa<NonTypeTemplateParmDecl>(this) ||
-      !getDeclContext() ||
-      !isa<CXXRecordDecl>(getDeclContext()) ||
-      isInvalidDecl() ||
-      isa<StaticAssertDecl>(this) ||
-      isa<BlockDecl>(this) ||
+  // 8. it's a temporary with lifetime extended due to being default value.
+  if (isa<TranslationUnitDecl>(this) || isa<TemplateTypeParmDecl>(this) ||
+      isa<NonTypeTemplateParmDecl>(this) || !getDeclContext() ||
+      !isa<CXXRecordDecl>(getDeclContext()) || isInvalidDecl() ||
+      isa<StaticAssertDecl>(this) || isa<BlockDecl>(this) ||
       // FIXME: a ParmVarDecl can have ClassTemplateSpecialization
       // as DeclContext (?).
       isa<ParmVarDecl>(this) ||
       // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have
       // AS_none as access specifier.
       isa<CXXRecordDecl>(this) ||
-      isa<ClassScopeFunctionSpecializationDecl>(this))
+      isa<ClassScopeFunctionSpecializationDecl>(this) ||
+      isa<LifetimeExtendedTemporaryDecl>(this))
     return true;
 
   assert(Access != AS_none &&

diff  --git a/clang/test/PCH/cxx-reference.h b/clang/test/PCH/cxx-reference.h
index b46a3671a325..a65d3feee072 100644
--- a/clang/test/PCH/cxx-reference.h
+++ b/clang/test/PCH/cxx-reference.h
@@ -11,3 +11,7 @@ LR &lrlr = c;
 LR &&rrlr = c;
 RR &lrrr = c;
 RR &&rrrr = 'c';
+
+struct S {
+  const int &x = 1; // LifetimeExtendedTemporary inside struct
+};