[clang] Fix crash with modules and constexpr destructor (PR #69076)

[Jonas Hahnfeld via cfe-commits]

https://github.com/hahnjo created https://github.com/llvm/llvm-project/pull/69076

Closes https://github.com/llvm/llvm-project/issues/68702

>From d149de4d4e00b63e506441b516f35aeb41786408 Mon Sep 17 00:00:00 2001
From: Jonas Hahnfeld <jonas.hahnfeld at cern.ch>
Date: Sat, 14 Oct 2023 20:10:28 +0200
Subject: [PATCH] Fix crash with modules and constexpr destructor

Closes https://github.com/llvm/llvm-project/issues/68702
---
 clang/lib/AST/ExprConstant.cpp | 11 +++---
 clang/test/Modules/pr68702.cpp | 65 ++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+), 4 deletions(-)
 create mode 100644 clang/test/Modules/pr68702.cpp

diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index e5539dedec02a4b..a97e7bd8140890e 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -15604,10 +15604,13 @@ bool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx,
     LValue LVal;
     LVal.set(VD);
 
-    if (!EvaluateInPlace(Value, Info, LVal, this,
-                         /*AllowNonLiteralTypes=*/true) ||
-        EStatus.HasSideEffects)
-      return false;
+    {
+      FullExpressionRAII Scope(Info);
+      if (!EvaluateInPlace(Value, Info, LVal, this,
+                           /*AllowNonLiteralTypes=*/true) ||
+          EStatus.HasSideEffects)
+        return false;
+    }
 
     // At this point, any lifetime-extended temporaries are completely
     // initialized.
diff --git a/clang/test/Modules/pr68702.cpp b/clang/test/Modules/pr68702.cpp
new file mode 100644
index 000000000000000..3f91a1001d1eecc
--- /dev/null
+++ b/clang/test/Modules/pr68702.cpp
@@ -0,0 +1,65 @@
+// RUN: rm -rf %t
+// RUN: mkdir %t
+// RUN: split-file %s %t
+
+// RUN: %clang_cc1 -std=c++20 -emit-obj -fmodules -fimplicit-module-maps -fmodules-cache-path=%t %t/main.cpp -o %t/main.o
+
+//--- V.h
+#ifndef V_H
+#define V_H
+
+class A {
+public:
+  constexpr A() { }
+  constexpr ~A() { }
+};
+
+template <typename T>
+class V {
+public:
+  V() = default;
+
+  constexpr V(int n, const A& a = A()) {}
+};
+
+#endif
+
+//--- inst1.h
+#include "V.h"
+
+static void inst1() {
+  V<int> v;
+}
+
+//--- inst2.h
+#include "V.h"
+
+static void inst2() {
+  V<int> v(100);
+}
+
+//--- module.modulemap
+module "M" {
+  export *
+  module "V.h" {
+    export *
+    header "V.h"
+  }
+  module "inst1.h" {
+    export *
+    header "inst1.h"
+  }
+}
+
+module "inst2.h" {
+  export *
+  header "inst2.h"
+}
+
+//--- main.cpp
+#include "V.h"
+#include "inst2.h"
+
+static void m() {
+  static V<int> v(100);
+}