[clang] [clang] Fix crash when destructor definition is preceded with '=' (PR #90220)

[Vlad Serebrennikov via cfe-commits]

https://github.com/Endilll created https://github.com/llvm/llvm-project/pull/90220

Fixes #89544

>From b9b17fa34dab666e4c77dad9cd4109f7a88d1c2e Mon Sep 17 00:00:00 2001
From: Vlad Serebrennikov <serebrennikov.vladislav at gmail.com>
Date: Fri, 26 Apr 2024 18:03:44 +0300
Subject: [PATCH] [clang] Fix crash when destructor definition is preceded with
 '='

Fixes #89544
---
 clang/docs/ReleaseNotes.rst       |  3 +++
 clang/lib/AST/Expr.cpp            |  8 +++++---
 clang/test/SemaCXX/destructor.cpp | 12 ++++++++++++
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 92563262cc6737..5d1260fbca7beb 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -436,6 +436,9 @@ Bug Fixes in This Version
 - Clang now correctly generates overloads for bit-precise integer types for
   builtin operators in C++. Fixes #GH82998.
 
+- Fix crash when destructor definition is preceded with an equals sign.
+  Fixes (#GH89544).
+
 - When performing mixed arithmetic between ``_Complex`` floating-point types and integers,
   Clang now correctly promotes the integer to its corresponding real floating-point
   type only rather than to the complex type (e.g. ``_Complex float / int`` is now evaluated
diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index 63dcdb919c7117..52c8c95b48abf7 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -3893,9 +3893,11 @@ namespace {
     }
 
     void VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) {
-      if (E->getTemporary()->getDestructor()->isTrivial()) {
-        Inherited::VisitStmt(E);
-        return;
+      if (const CXXDestructorDecl *DtorDecl = E->getTemporary()->getDestructor()) {
+        if (DtorDecl->isTrivial()) {
+          Inherited::VisitStmt(E);
+          return;
+        }
       }
 
       NonTrivial = true;
diff --git a/clang/test/SemaCXX/destructor.cpp b/clang/test/SemaCXX/destructor.cpp
index beac50e449e96d..028bc7cc196989 100644
--- a/clang/test/SemaCXX/destructor.cpp
+++ b/clang/test/SemaCXX/destructor.cpp
@@ -565,4 +565,16 @@ struct Foo : public Baz { // expected-error {{cannot override a non-deleted func
 };
 }
 
+namespace GH89544 {
+class Foo {
+  ~Foo() = {}
+  // expected-error at -1 {{initializer on function does not look like a pure-specifier}}
+  // expected-error at -2 {{expected ';' at end of declaration list}}
+};
+
+static_assert(!__is_trivially_constructible(Foo), "");
+static_assert(!__is_trivially_constructible(Foo, const Foo &), "");
+static_assert(!__is_trivially_constructible(Foo, Foo &&), "");
+} // namespace GH89544
+
 #endif // BE_THE_HEADER