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

Fixes #89544

Author: Endilll

clang/docs/ReleaseNotes.rst

@@ -472,6 +472,9 @@ 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

clang/include/clang/AST/ExprCXX.h

@@ -1482,6 +1482,8 @@ class CXXTemporary {
 ///     const S &s_ref = S(); // Requires a CXXBindTemporaryExpr.
 ///   }
 /// \endcode
+///
+/// Destructor might be null if destructor declaration is not valid.
 class CXXBindTemporaryExpr : public Expr {
   CXXTemporary *Temp = nullptr;
   Stmt *SubExpr = nullptr;

clang/lib/AST/Expr.cpp

@@ -3893,9 +3893,14 @@ namespace {
     }
 
     void VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) {
-      if (E->getTemporary()->getDestructor()->isTrivial()) {
-        Inherited::VisitStmt(E);
-        return;
+      // Destructor of the temporary might be null if destructor declaration
+      // is not valid.
+      if (const CXXDestructorDecl *DtorDecl =
+              E->getTemporary()->getDestructor()) {
+        if (DtorDecl->isTrivial()) {
+          Inherited::VisitStmt(E);
+          return;
+        }
       }
 
       NonTrivial = true;

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@-1 {{initializer on function does not look like a pure-specifier}}
+  // expected-error@-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