Adapt loplugin:nullptr to RecursiveASTVisitior::TraverseInitListExpr change

...<https://github.com/llvm/llvm-project/commit/
0a42fe70a566f22599e04a6f1344ca2dc5565e17> "[AST] Treat semantic form of
InitListExpr as implicit code in traversals"

Change-Id: Ifd17009fcc6933abf0e9178dbe47fb9c14b274b7
Reviewed-on: https://gerrit.libreoffice.org/77595
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

compilerplugins/clang/nullptr.cxx

@@ -75,6 +75,8 @@ public:
 
     bool TraverseLinkageSpecDecl(LinkageSpecDecl * decl);
 
+    bool TraverseInitListExpr(InitListExpr * expr, DataRecursionQueue * queue = nullptr);
+
     // bool shouldVisitTemplateInstantiations() const { return true; }
 
 private:
@@ -231,6 +233,12 @@ bool Nullptr::TraverseLinkageSpecDecl(LinkageSpecDecl * decl) {
     return ret;
 }
 
+bool Nullptr::TraverseInitListExpr(InitListExpr * expr, DataRecursionQueue * queue) {
+    return WalkUpFromInitListExpr(expr)
+        && TraverseSynOrSemInitListExpr(
+            expr->isSemanticForm() ? expr : expr->getSemanticForm(), queue);
+}
+
 bool Nullptr::isInLokIncludeFile(SourceLocation spellingLocation) const {
     return loplugin::hasPathnamePrefix(
         getFileNameOfSpellingLoc(spellingLocation),

compilerplugins/clang/test/nullptr.cxx

@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+struct S
+{
+    void* p;
+};
+
+int main()
+{
+    S s{
+        0 // expected-error {{NullToPointer ValueDependentIsNotNull ZeroLiteral -> nullptr [loplugin:nullptr]}}
+    };
+    (void)s;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */

solenv/CompilerTest_compilerplugins_clang.mk

@@ -36,6 +36,7 @@ $(eval $(call gb_CompilerTest_add_exception_objects,compilerplugins_clang, \
     compilerplugins/clang/test/indentation \
     compilerplugins/clang/test/logexceptionnicely \
     compilerplugins/clang/test/loopvartoosmall \
+    compilerplugins/clang/test/nullptr \
     compilerplugins/clang/test/mapindex \
     compilerplugins/clang/test/oncevar \
     compilerplugins/clang/test/oslendian-1 \