[clang] [clang] Fix crash when inheriting from a cv-qualified type (PR #70594)

[Rajveer Singh Bharadwaj via cfe-commits]

https://github.com/Rajveer100 updated https://github.com/llvm/llvm-project/pull/70594

>From f2a9a4137d39dd9f3896c64f41d5700774ec9204 Mon Sep 17 00:00:00 2001
From: Rajveer <rajveer.developer at icloud.com>
Date: Sun, 29 Oct 2023 18:37:17 +0530
Subject: [PATCH] [clang] Fix a crash in debug mode

Resolves Issue #35603

This bug was caused due to the assertions being too strict,
loosened by stripping qualifiers from the base class but not
from the type of the initializer.

Added Release Notes for the same.
---
 clang/docs/ReleaseNotes.rst    |  3 +++
 clang/lib/AST/ExprConstant.cpp |  2 +-
 clang/test/Sema/GH70594.cpp    | 28 ++++++++++++++++++++++++++++
 3 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 clang/test/Sema/GH70594.cpp

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 93cc5291e2391fb..07aad91e3e2b322 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -390,6 +390,9 @@ Bug Fixes to C++ Support
 - Fixed a crash while checking constraints of a trailing requires-expression of a lambda, that the
   expression references to an entity declared outside of the lambda. (#GH64808)
 
+- Fix crash when inheriting from a cv-qualified type. Fixes:
+  (`#35603 <https://github.com/llvm/llvm-project/issues/35603>`_)
+
 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 - Clang now properly preserves ``FoundDecls`` within a ``ConceptReference``. (#GH82628)
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 7137efb7876de2b..753bbcc94db4f44 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -6453,7 +6453,7 @@ static bool HandleConstructorCall(const Expr *E, const LValue &This,
       // Non-virtual base classes are initialized in the order in the class
       // definition. We have already checked for virtual base classes.
       assert(!BaseIt->isVirtual() && "virtual base for literal type");
-      assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) &&
+      assert(Info.Ctx.hasSameUnqualifiedType(BaseIt->getType(), BaseType) &&
              "base class initializers not in expected order");
       ++BaseIt;
 #endif
diff --git a/clang/test/Sema/GH70594.cpp b/clang/test/Sema/GH70594.cpp
new file mode 100644
index 000000000000000..ce98e9b12b5cba3
--- /dev/null
+++ b/clang/test/Sema/GH70594.cpp
@@ -0,0 +1,28 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -verify
+// RUN: %clang_cc1 -fsyntax-only -std=c++23 %s -verify
+
+// expected-no-diagnostics
+
+struct A {};
+using CA = const A;
+
+struct S1 : CA {
+  constexpr S1() : CA() {}
+};
+
+struct S2 : A {
+  constexpr S2() : CA() {}
+};
+
+struct S3 : CA {
+  constexpr S3() : A() {}
+};
+
+struct Int {};
+
+template <class _Hp>
+struct __tuple_leaf : _Hp {
+  constexpr __tuple_leaf() : _Hp() {}
+};
+
+constexpr __tuple_leaf<const Int> t;