1 files changed, 125 insertions, 0 deletions
diff --git a/compilerplugins/clang/test/casttovoid.cxx b/compilerplugins/clang/test/casttovoid.cxx
new file mode 100644
index 000000000..3d8c22b49
--- /dev/null
+++ b/compilerplugins/clang/test/casttovoid.cxx
@@ -0,0 +1,125 @@
+/* -*- 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/.
+ */
+
+#undef NDEBUG
+#include <cassert>
+
+#define CAST_N3 (void) n3
+#define ASSERT_N4 assert(n4 == 0)
+#define ASSERT(x) assert(x)
+#define USE(x) x
+
+int f1(int n1, int n2, int n3, int n4, int n5) {
+    (void) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    int const & r1 = n1; // expected-note {{first consumption is here [loplugin:casttovoid]}}
+    (void) n2; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    int const & r2 = {n2}; // expected-note {{first consumption is here [loplugin:casttovoid]}}
+    (void) n3; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    int const & r3{n3}; // expected-note {{first consumption is here [loplugin:casttovoid]}}
+    (void) n4; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    int const & r4(n4); // expected-note {{first consumption is here [loplugin:casttovoid]}}
+    (void) n5; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    int const & r5 = (n5); // expected-note {{first consumption is here [loplugin:casttovoid]}}
+    return r1 + r2 + r3 + r4 + r5;
+}
+
+int const & f2(int const & n) {
+    (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    return n; // expected-note {{first consumption is here [loplugin:casttovoid]}}
+}
+
+int const & f3(int const & n) {
+    (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    return (n); // expected-note {{first consumption is here [loplugin:casttovoid]}}
+}
+
+int const & f4(int const & n) {
+    (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    return {n}; // expected-note {{first consumption is here [loplugin:casttovoid]}}
+}
+
+int const & f5(int const & n) {
+    (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    return {(n)}; // expected-note {{first consumption is here [loplugin:casttovoid]}}
+}
+
+struct S1 {
+    S1(int n1, int n2):
+        n1_(n1), // expected-note {{first consumption is here [loplugin:casttovoid]}}
+        n2_{n2} // expected-note {{first consumption is here [loplugin:casttovoid]}}
+    {
+        (void) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+        (void) n2; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    }
+    int const n1_;
+    int const n2_;
+};
+
+struct S2 { int n; };
+
+int fS2_1(S2 s) {
+    (void) s; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    return s.n; // expected-note {{first consumption is here [loplugin:casttovoid]}}
+}
+
+int const & fS2_2(S2 const & s) {
+    (void) s; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    return s.n; // expected-note {{first consumption is here [loplugin:casttovoid]}}
+}
+
+// Don't trigger assert in CastToVoid::VisitReturnStmt:
+int n = [] { return 0; }();
+
+int f() {
+    int n1 = n;
+    int n2 = [](int const & n) -> int const & {
+        (void) n; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+        return n; // expected-note {{first consumption is here [loplugin:casttovoid]}}
+    }(n1);
+    return n2;
+}
+
+int main() {
+    int n1 = 0;
+    (void) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    (void const) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    (void volatile) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    (void const volatile) n1; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    (void) (n1); // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    (void) ((n1)); // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    (void(n1)); // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    static_cast<void>(n1); // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    int n2 = 0;
+    assert(n2 == 0);
+    (void) n2; // expected-error {{unnecessary cast to void [loplugin:casttovoid]}}
+    int n3 = 0;
+    CAST_N3;
+    int n4 = 0;
+    ASSERT_N4;
+    (void) n4;
+    int n5 = 0;
+    assert(n5 == 0);
+    (void) n5;
+    int n6 = 0;
+    ASSERT(n6 == 0);
+    (void) n6;
+    int n7 = 0;
+    assert(USE(n7) == 0);
+    (void) n7;
+    int n8 = 0;
+    ASSERT(USE(USE(n8 == 0)));
+    (void) n8;
+    int volatile n9 = 0;
+    (void) n9;
+    return n1 // expected-note 8 {{first consumption is here [loplugin:casttovoid]}}
+        + n2 // expected-note {{first consumption is here [loplugin:casttovoid]}}
+        + n3;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */