diff options
| author | Stephan Bergmann <sbergman@redhat.com> | 2017-10-20 14:48:16 +0200 |
|---|---|---|
| committer | Noel Grandin <noel.grandin@collabora.co.uk> | 2017-10-21 07:03:04 +0200 |
| commit | 1c680d763e770250b8e1b0e63e62a4f5ecda3b74 (patch) | |
| tree | 46511cee8769adb595f08f41090343b13ebc94d7 /compilerplugins/clang | |
| parent | 254c49dcceaa8b181b2cb3338e34e5637be277b9 (diff) | |
Avoid loplugin:faileddyncast for "unnecessary", up-casting dynamic_cast
Change-Id: Iecb943db0aff7ffc21cc2f6adb625be369255b32
Reviewed-on: https://gerrit.libreoffice.org/43606
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Diffstat (limited to 'compilerplugins/clang')
| -rw-r--r-- | compilerplugins/clang/faileddyncast.cxx | 6 | ||||
| -rw-r--r-- | compilerplugins/clang/test/faileddyncast.cxx | 21 |
2 files changed, 27 insertions, 0 deletions
diff --git a/compilerplugins/clang/faileddyncast.cxx b/compilerplugins/clang/faileddyncast.cxx index bdc9ce6e5fad..9a257d7d8a23 100644 --- a/compilerplugins/clang/faileddyncast.cxx +++ b/compilerplugins/clang/faileddyncast.cxx @@ -80,7 +80,13 @@ bool isAlwaysNull(CXXDynamicCastExpr const * expr) { return false; #endif +#if 0 return !DestRD->isDerivedFrom(SrcRD); +#else + return !(DestRD->isDerivedFrom(SrcRD) + || SrcRD->isDerivedFrom(DestRD) + || SrcRD == DestRD); +#endif } class FailedDynCast: diff --git a/compilerplugins/clang/test/faileddyncast.cxx b/compilerplugins/clang/test/faileddyncast.cxx new file mode 100644 index 000000000000..7d835e041f7a --- /dev/null +++ b/compilerplugins/clang/test/faileddyncast.cxx @@ -0,0 +1,21 @@ +/* -*- 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 S1 { virtual ~S1(); }; +struct S2 final: S1 {}; +struct S3: S1 {}; + +void f(S1 * s1, S2 * s2) { + (void) dynamic_cast<S2 *>(s1); + (void) dynamic_cast<S1 *>(s2); + (void) dynamic_cast<S2 *>(s2); + (void) dynamic_cast<S3 *>(s2); // expected-error {{dynamic_cast from 'S2 *' to 'S3 *' always fails [loplugin:faileddyncast]}} +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */ |