[PATCH] D86624: [clang] Exclude invalid destructors from lookups.

[Adam Czachorowski via Phabricator via cfe-commits]

adamcz created this revision.
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This fixes a crash when declaring a destructor with a wrong name, then
writing result to pch file and loading it again. The PCH storage uses
DeclarationNameKey as key and it is the same key for both the invalid
destructor and the implicit one that was created because the other one
was invalid. When querying for the Foo::~Foo we end up getting
Foo::~Bar, which is then rejected and we end up with nullptr in
CXXRecordDecl::GetDestructor().

Fixes https://bugs.llvm.org/show_bug.cgi?id=47270


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D86624

Files:
  clang/lib/AST/DeclBase.cpp
  clang/test/PCH/cxx-invalid-destructor.cpp
  clang/test/PCH/cxx-invalid-destructor.h


Index: clang/test/PCH/cxx-invalid-destructor.h
===================================================================
--- /dev/null
+++ clang/test/PCH/cxx-invalid-destructor.h
@@ -0,0 +1,14 @@
+class Base {
+public:
+  ~Base();
+};
+
+class Bar {
+public:
+  ~Bar();
+};
+
+class Foo : public Base {
+public:
+  ~Bar();
+};
Index: clang/test/PCH/cxx-invalid-destructor.cpp
===================================================================
--- /dev/null
+++ clang/test/PCH/cxx-invalid-destructor.cpp
@@ -0,0 +1,4 @@
+// RUN: %clang_cc1 -x c++ -std=c++11 -emit-pch -o %t %S/cxx-invalid-destructor.h -fallow-pch-with-compiler-errors
+// RUN: %clang_cc1 -x c++ -std=c++11 -include-pch %t %S/cxx-invalid-destructor.cpp -fsyntax-only -fno-validate-pch
+
+Foo f;
Index: clang/lib/AST/DeclBase.cpp
===================================================================
--- clang/lib/AST/DeclBase.cpp
+++ clang/lib/AST/DeclBase.cpp
@@ -1486,6 +1486,8 @@
   if (auto *FD = dyn_cast<FunctionDecl>(D))
     if (FD->isFunctionTemplateSpecialization())
       return true;
+  if (isa<CXXDestructorDecl>(D) && D->isInvalidDecl())
+    return true;
 
   return false;
 }


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