09849784f1
Change-Id: I07f828e8a17de03cf15639df8afa0adf5dcaebba Reviewed-on: https://gerrit.libreoffice.org/c/core/+/92246 Tested-by: Jenkins Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
564 lines
19 KiB
C++
564 lines
19 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <cassert>
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#include <string>
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#include <iostream>
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#include <unordered_set>
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#include "plugin.hxx"
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#include "check.hxx"
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#include "clang/AST/CXXInheritance.h"
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#include "clang/AST/StmtVisitor.h"
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// This checker aims to pull buried assignments out of complex expressions,
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// where they are quite hard to notice amidst the other conditional logic.
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namespace
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{
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class BuriedAssign : public loplugin::FilteringPlugin<BuriedAssign>
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{
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public:
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explicit BuriedAssign(loplugin::InstantiationData const& data)
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: FilteringPlugin(data)
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{
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}
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virtual void run() override
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{
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std::string fn(handler.getMainFileName());
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loplugin::normalizeDotDotInFilePath(fn);
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// code where I don't have a better alternative
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if (fn == SRCDIR "/sal/osl/unx/profile.cxx")
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return;
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if (fn == SRCDIR "/sal/rtl/uri.cxx")
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return;
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if (fn == SRCDIR "/sal/osl/unx/process.cxx")
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return;
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if (fn == SRCDIR "/sal/rtl/bootstrap.cxx")
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return;
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if (fn == SRCDIR "/i18npool/source/textconversion/genconv_dict.cxx")
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return;
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if (fn == SRCDIR "/soltools/cpp/_macro.c")
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return;
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if (fn == SRCDIR "/stoc/source/inspect/introspection.cxx")
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return;
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if (fn == SRCDIR "/tools/source/fsys/urlobj.cxx")
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return;
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if (fn == SRCDIR "/sax/source/tools/fastserializer.cxx")
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return;
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if (fn == SRCDIR "/svl/source/crypto/cryptosign.cxx")
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return;
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if (fn == SRCDIR "/svl/source/numbers/zforfind.cxx")
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return;
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if (fn == SRCDIR "/svl/source/numbers/zformat.cxx")
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return;
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if (fn == SRCDIR "/svl/source/numbers/zforscan.cxx")
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return;
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if (fn == SRCDIR "/svl/source/numbers/zforlist.cxx")
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return;
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if (fn == SRCDIR "/vcl/source/window/debugevent.cxx")
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return;
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if (fn == SRCDIR "/vcl/source/control/scrbar.cxx")
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return;
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if (fn == SRCDIR "/vcl/source/gdi/bitmap3.cxx")
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return;
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if (fn == SRCDIR "/vcl/source/window/menu.cxx")
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return;
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if (fn == SRCDIR "/vcl/source/fontsubset/sft.cxx")
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return;
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if (fn == SRCDIR "/vcl/unx/generic/print/prtsetup.cxx")
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return;
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if (fn == SRCDIR "/svtools/source/brwbox/brwbox1.cxx")
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return;
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if (fn == SRCDIR "/svtools/source/control/valueset.cxx")
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return;
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if (fn == SRCDIR "/basic/source/runtime/iosys.cxx")
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return;
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if (fn == SRCDIR "/basic/source/runtime/runtime.cxx")
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return;
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if (fn == SRCDIR "/basic/source/sbx/sbxvalue.cxx")
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return;
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if (fn == SRCDIR "/basic/source/sbx/sbxvalue.cxx")
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return;
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if (fn == SRCDIR "/sfx2/source/dialog/templdlg.cxx")
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return;
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if (fn == SRCDIR "/sfx2/source/view/viewfrm.cxx")
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return;
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if (fn == SRCDIR "/connectivity/source/commontools/dbtools.cxx")
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return;
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if (fn == SRCDIR "/xmloff/source/style/xmlnumfi.cxx")
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return;
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if (fn == SRCDIR "/xmloff/source/style/xmlnumfe .cxx")
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return;
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if (fn == SRCDIR "/editeng/source/items/textitem.cxx")
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return;
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if (fn == SRCDIR "/editeng/source/rtf/rtfitem.cxx")
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return;
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if (fn == SRCDIR "/editeng/source/rtf/svxrtf.cxx")
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return;
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if (fn == SRCDIR "/editeng/source/misc/svxacorr.cxx")
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return;
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if (fn == SRCDIR "/svx/source/items/numfmtsh.cxx")
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return;
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if (fn == SRCDIR "/svx/source/dialog/hdft.cxx")
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return;
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if (fn == SRCDIR "/cui/source/dialogs/insdlg.cxx")
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return;
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if (fn == SRCDIR "/cui/source/tabpages/paragrph.cxx")
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return;
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if (fn == SRCDIR "/cui/source/tabpages/page.cxx")
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return;
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if (fn == SRCDIR "/cui/source/tabpages/border.cxx")
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return;
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if (fn == SRCDIR "/cui/source/tabpages/chardlg.cxx")
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return;
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if (fn == SRCDIR "/cui/source/tabpages/numpages.cxx")
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return;
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if (fn == SRCDIR "/cui/source/dialogs/SpellDialog.cxx")
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return;
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if (fn == SRCDIR "/oox/source/drawingml/diagram/diagramlayoutatoms.cxx")
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return;
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if (fn == SRCDIR "/dbaccess/source/core/dataaccess/intercept.cxx")
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return;
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if (fn == SRCDIR "/writerfilter/source/dmapper/DomainMapper.cxx")
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return;
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if (fn == SRCDIR "/writerfilter/source/dmapper/DomainMapper_Impl.cxx")
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return;
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if (fn == SRCDIR "/lotuswordpro/source/filter/lwptablelayout.cxx")
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return;
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if (fn == SRCDIR "/i18npool/source/characterclassification/cclass_unicode_parser.cxx")
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return;
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if (fn == SRCDIR "/sd/source/filter/eppt/pptx-animations.cxx")
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return;
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if (fn == SRCDIR "/sc/source/core/tool/address.cxx")
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return;
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if (fn == SRCDIR "/sc/source/core/tool/interpr1.cxx")
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return;
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if (fn == SRCDIR "/sc/source/core/tool/interpr4.cxx")
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return;
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if (fn == SRCDIR "/sc/source/core/tool/interpr5.cxx")
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return;
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if (fn == SRCDIR "/sc/source/core/tool/compiler.cxx")
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return;
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if (fn == SRCDIR "/sc/source/core/data/table4.cxx")
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return;
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if (fn == SRCDIR "/sc/source/ui/drawfunc/fudraw.cxx")
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return;
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if (fn == SRCDIR "/sc/source/filter/xml/xmlcelli.cxx")
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return;
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if (fn == SRCDIR "/sc/source/ui/miscdlgs/crnrdlg.cxx")
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return;
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if (fn == SRCDIR "/sc/source/ui/app/inputwin.cxx")
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return;
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if (fn == SRCDIR "/sc/source/ui/view/viewfun2.cxx")
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return;
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if (fn == SRCDIR "/sc/source/ui/unoobj/docuno.cxx")
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return;
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if (fn == SRCDIR "/sc/source/ui/view/gridwin.cxx")
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return;
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if (fn == SRCDIR "/sw/source/core/crsr/callnk.cxx")
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return;
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if (fn == SRCDIR "/sw/source/core/crsr/findtxt.cxx")
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return;
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if (fn == SRCDIR "/sw/source/core/crsr/crsrsh.cxx")
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return;
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if (fn == SRCDIR "/sw/source/core/crsr/crstrvl.cxx")
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return;
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if (fn == SRCDIR "/sw/source/core/doc/doccomp.cxx")
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return;
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if (fn == SRCDIR "/sw/source/core/doc/docedt.cxx")
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return;
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if (fn == SRCDIR "/sw/source/core/doc/docfly.cxx")
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return;
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if (fn == SRCDIR "/sw/source/core/doc/DocumentRedlineManager.cxx")
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return;
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if (fn == SRCDIR "/sw/source/core/doc/notxtfrm.cxx")
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return;
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// the point at which I gave up on sw/ because it just does it EVERYWHERE
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if (loplugin::hasPathnamePrefix(fn, SRCDIR "/sw/"))
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return;
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if (fn == SRCDIR "/starmath/source/mathtype.cxx")
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return;
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if (fn == SRCDIR "/starmath/source/mathmlexport.cxx")
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return;
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if (fn == SRCDIR "/starmath/source/view.cxx")
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return;
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if (fn == SRCDIR "/xmlhelp/source/treeview/tvread.cxx")
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return;
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TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
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}
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bool VisitBinaryOperator(BinaryOperator const*);
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bool VisitCXXOperatorCallExpr(CXXOperatorCallExpr const*);
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bool VisitCompoundStmt(CompoundStmt const*);
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bool VisitIfStmt(IfStmt const*);
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bool VisitLabelStmt(LabelStmt const*);
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bool VisitForStmt(ForStmt const*);
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bool VisitCXXForRangeStmt(CXXForRangeStmt const*);
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bool VisitWhileStmt(WhileStmt const*);
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bool VisitDoStmt(DoStmt const*);
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bool VisitCaseStmt(CaseStmt const*);
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bool VisitDefaultStmt(DefaultStmt const*);
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bool VisitVarDecl(VarDecl const*);
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bool VisitCXXFoldExpr(CXXFoldExpr const*);
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private:
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void MarkIfAssignment(Stmt const*);
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void MarkConditionForControlLoops(Expr const*);
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std::unordered_set<const Stmt*> m_handled;
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};
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static bool isAssignmentOp(clang::BinaryOperatorKind op)
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{
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// We ignore BO_ShrAssign i.e. >>= because we use that everywhere for
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// extracting data from css::uno::Any
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return op == BO_Assign || op == BO_MulAssign || op == BO_DivAssign || op == BO_RemAssign
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|| op == BO_AddAssign || op == BO_SubAssign || op == BO_ShlAssign || op == BO_AndAssign
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|| op == BO_XorAssign || op == BO_OrAssign;
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}
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static bool isAssignmentOp(clang::OverloadedOperatorKind Opc)
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{
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// Same logic as CXXOperatorCallExpr::isAssignmentOp(), which our supported clang
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// doesn't have yet.
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// Except that we ignore OO_GreaterGreaterEqual i.e. >>= because we use that everywhere for
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// extracting data from css::uno::Any
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return Opc == OO_Equal || Opc == OO_StarEqual || Opc == OO_SlashEqual || Opc == OO_PercentEqual
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|| Opc == OO_PlusEqual || Opc == OO_MinusEqual || Opc == OO_LessLessEqual
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|| Opc == OO_AmpEqual || Opc == OO_CaretEqual || Opc == OO_PipeEqual;
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}
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static bool isComparisonOp(clang::OverloadedOperatorKind op)
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{
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return op == OO_Less || op == OO_Greater || op == OO_LessEqual || op == OO_GreaterEqual
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|| op == OO_EqualEqual || op == OO_ExclaimEqual;
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}
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static const Expr* IgnoreImplicitAndConversionOperator(const Expr* expr)
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{
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expr = compat::IgnoreImplicit(expr);
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if (auto memberCall = dyn_cast<CXXMemberCallExpr>(expr))
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{
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if (auto conversionDecl = dyn_cast_or_null<CXXConversionDecl>(memberCall->getMethodDecl()))
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{
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if (!conversionDecl->isExplicit())
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expr = compat::IgnoreImplicit(memberCall->getImplicitObjectArgument());
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}
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}
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return expr;
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}
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bool BuriedAssign::VisitBinaryOperator(BinaryOperator const* binaryOp)
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{
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if (ignoreLocation(binaryOp))
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return true;
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if (compat::getBeginLoc(binaryOp).isMacroID())
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return true;
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if (!isAssignmentOp(binaryOp->getOpcode()))
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return true;
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auto expr = IgnoreImplicitAndConversionOperator(binaryOp->getRHS());
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if (auto rhs = dyn_cast<BinaryOperator>(expr))
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{
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// Ignore chained assignment.
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// TODO limit this to only ordinary assignment
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if (isAssignmentOp(rhs->getOpcode()))
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m_handled.insert(rhs);
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}
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else if (auto rhs = dyn_cast<CXXOperatorCallExpr>(expr))
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{
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// Ignore chained assignment.
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// TODO limit this to only ordinary assignment
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if (isAssignmentOp(rhs->getOperator()))
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m_handled.insert(rhs);
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}
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else if (auto cxxConstruct = dyn_cast<CXXConstructExpr>(expr))
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{
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if (cxxConstruct->getNumArgs() == 1)
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MarkIfAssignment(cxxConstruct->getArg(0));
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}
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if (!m_handled.insert(binaryOp).second)
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return true;
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// assignment in constructor
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StringRef aFileName = getFilenameOfLocation(
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compiler.getSourceManager().getSpellingLoc(compat::getBeginLoc(binaryOp)));
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if (loplugin::hasPathnamePrefix(aFileName, SRCDIR "/include/comphelper/flagguard.hxx"))
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return true;
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report(DiagnosticsEngine::Warning, "buried assignment, rather put on own line",
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compat::getBeginLoc(binaryOp))
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<< binaryOp->getSourceRange();
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//getParentStmt(getParentStmt(getParentStmt(binaryOp)))->dump();
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return true;
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}
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bool BuriedAssign::VisitCXXOperatorCallExpr(CXXOperatorCallExpr const* cxxOper)
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{
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if (ignoreLocation(cxxOper))
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return true;
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if (compat::getBeginLoc(cxxOper).isMacroID())
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return true;
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if (!isAssignmentOp(cxxOper->getOperator()))
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return true;
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auto expr = IgnoreImplicitAndConversionOperator(cxxOper->getArg(1));
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if (auto rhs = dyn_cast<BinaryOperator>(expr))
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{
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// Ignore chained assignment.
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// TODO limit this to only ordinary assignment
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if (isAssignmentOp(rhs->getOpcode()))
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m_handled.insert(rhs);
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}
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else if (auto rhs = dyn_cast<CXXOperatorCallExpr>(expr))
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{
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// Ignore chained assignment.
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// TODO limit this to only ordinary assignment
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if (isAssignmentOp(rhs->getOperator()))
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m_handled.insert(rhs);
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}
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else if (auto cxxConstruct = dyn_cast<CXXConstructExpr>(expr))
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{
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if (cxxConstruct->getNumArgs() == 1)
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MarkIfAssignment(cxxConstruct->getArg(0));
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}
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if (!m_handled.insert(cxxOper).second)
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return true;
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report(DiagnosticsEngine::Warning, "buried assignment, rather put on own line",
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compat::getBeginLoc(cxxOper))
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<< cxxOper->getSourceRange();
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//getParentStmt(getParentStmt(getParentStmt(getParentStmt(getParentStmt(cxxOper)))))->dump();
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return true;
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}
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bool BuriedAssign::VisitCompoundStmt(CompoundStmt const* compoundStmt)
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{
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if (ignoreLocation(compoundStmt))
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return true;
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for (auto i = compoundStmt->child_begin(); i != compoundStmt->child_end(); ++i)
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{
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if (auto expr = dyn_cast<Expr>(*i))
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{
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expr = compat::IgnoreImplicit(expr);
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if (auto binaryOp = dyn_cast<BinaryOperator>(expr))
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{
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// ignore comma-chained statements at this level
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if (binaryOp->getOpcode() == BO_Comma)
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{
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MarkIfAssignment(binaryOp->getLHS());
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MarkIfAssignment(binaryOp->getRHS());
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continue;
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}
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}
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MarkIfAssignment(expr);
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}
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}
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return true;
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}
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void BuriedAssign::MarkIfAssignment(Stmt const* stmt)
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{
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if (auto expr = dyn_cast_or_null<Expr>(stmt))
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{
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expr = compat::IgnoreImplicit(expr);
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if (auto binaryOp = dyn_cast<BinaryOperator>(expr))
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{
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if (isAssignmentOp(binaryOp->getOpcode()))
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{
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m_handled.insert(expr);
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MarkIfAssignment(binaryOp->getRHS()); // in case it is chained
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}
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else if (binaryOp->getOpcode() == BO_Comma)
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{
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MarkIfAssignment(binaryOp->getLHS());
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MarkIfAssignment(binaryOp->getRHS());
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}
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}
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else if (auto cxxOper = dyn_cast<CXXOperatorCallExpr>(expr))
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{
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if (isAssignmentOp(cxxOper->getOperator()))
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{
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m_handled.insert(expr);
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MarkIfAssignment(cxxOper->getArg(1)); // in case it is chained
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}
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}
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}
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}
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bool BuriedAssign::VisitIfStmt(IfStmt const* ifStmt)
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{
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if (ignoreLocation(ifStmt))
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return true;
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MarkConditionForControlLoops(ifStmt->getCond());
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MarkIfAssignment(ifStmt->getThen());
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MarkIfAssignment(ifStmt->getElse());
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return true;
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}
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bool BuriedAssign::VisitCaseStmt(CaseStmt const* stmt)
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{
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if (ignoreLocation(stmt))
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return true;
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MarkIfAssignment(stmt->getSubStmt());
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return true;
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}
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bool BuriedAssign::VisitDefaultStmt(DefaultStmt const* stmt)
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{
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if (ignoreLocation(stmt))
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return true;
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MarkIfAssignment(stmt->getSubStmt());
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return true;
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}
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bool BuriedAssign::VisitWhileStmt(WhileStmt const* stmt)
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{
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if (ignoreLocation(stmt))
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return true;
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MarkConditionForControlLoops(stmt->getCond());
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MarkIfAssignment(stmt->getBody());
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return true;
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}
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bool BuriedAssign::VisitDoStmt(DoStmt const* stmt)
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{
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if (ignoreLocation(stmt))
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return true;
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MarkConditionForControlLoops(stmt->getCond());
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MarkIfAssignment(stmt->getBody());
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return true;
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}
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/** stuff like
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* while ((x = foo())
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* and
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* while ((x = foo() < 0)
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* is considered idiomatic.
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*/
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void BuriedAssign::MarkConditionForControlLoops(Expr const* expr)
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{
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if (!expr)
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return;
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expr = compat::IgnoreImplicit(expr);
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if (auto binaryOp = dyn_cast<BinaryOperator>(expr))
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{
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// ignore comma-chained statements at this level
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if (binaryOp->getOpcode() == BO_Comma)
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{
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MarkConditionForControlLoops(binaryOp->getLHS());
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MarkConditionForControlLoops(binaryOp->getRHS());
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return;
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}
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}
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// unwrap conversion to bool
|
|
if (auto memberCall = dyn_cast<CXXMemberCallExpr>(expr))
|
|
{
|
|
if (memberCall->getMethodDecl() && isa<CXXConversionDecl>(memberCall->getMethodDecl()))
|
|
{
|
|
// TODO check that the conversion is converting to bool
|
|
expr = compat::IgnoreImplicit(memberCall->getImplicitObjectArgument());
|
|
}
|
|
}
|
|
|
|
if (auto binaryOp = dyn_cast<BinaryOperator>(expr))
|
|
{
|
|
// handle: ((xxx = foo()) != error)
|
|
if (binaryOp->isComparisonOp())
|
|
{
|
|
MarkIfAssignment(compat::IgnoreImplicit(binaryOp->getLHS())->IgnoreParens());
|
|
MarkIfAssignment(compat::IgnoreImplicit(binaryOp->getRHS())->IgnoreParens());
|
|
}
|
|
}
|
|
else if (auto cxxOper = dyn_cast<CXXOperatorCallExpr>(expr))
|
|
{
|
|
// handle: ((xxx = foo()) != error)
|
|
if (isComparisonOp(cxxOper->getOperator()))
|
|
{
|
|
MarkIfAssignment(compat::IgnoreImplicit(cxxOper->getArg(0))->IgnoreParens());
|
|
MarkIfAssignment(compat::IgnoreImplicit(cxxOper->getArg(1))->IgnoreParens());
|
|
}
|
|
// handle: (!(xxx = foo()))
|
|
else if (cxxOper->getOperator() == OO_Exclaim)
|
|
MarkIfAssignment(compat::IgnoreImplicit(cxxOper->getArg(0))->IgnoreParens());
|
|
}
|
|
else if (auto parenExpr = dyn_cast<ParenExpr>(expr))
|
|
{
|
|
// handle: ((xxx = foo()))
|
|
MarkIfAssignment(compat::IgnoreImplicit(parenExpr->getSubExpr()));
|
|
}
|
|
else if (auto unaryOp = dyn_cast<UnaryOperator>(expr))
|
|
{
|
|
// handle: (!(xxx = foo()))
|
|
MarkIfAssignment(compat::IgnoreImplicit(unaryOp->getSubExpr())->IgnoreParens());
|
|
}
|
|
else
|
|
MarkIfAssignment(expr);
|
|
}
|
|
|
|
bool BuriedAssign::VisitForStmt(ForStmt const* stmt)
|
|
{
|
|
if (ignoreLocation(stmt))
|
|
return true;
|
|
MarkIfAssignment(stmt->getInit());
|
|
MarkConditionForControlLoops(stmt->getCond());
|
|
MarkIfAssignment(stmt->getInc());
|
|
MarkIfAssignment(stmt->getBody());
|
|
return true;
|
|
}
|
|
|
|
bool BuriedAssign::VisitCXXForRangeStmt(CXXForRangeStmt const* stmt)
|
|
{
|
|
if (ignoreLocation(stmt))
|
|
return true;
|
|
MarkIfAssignment(stmt->getBody());
|
|
return true;
|
|
}
|
|
|
|
bool BuriedAssign::VisitLabelStmt(LabelStmt const* stmt)
|
|
{
|
|
if (ignoreLocation(stmt))
|
|
return true;
|
|
MarkIfAssignment(stmt->getSubStmt());
|
|
return true;
|
|
}
|
|
|
|
bool BuriedAssign::VisitVarDecl(VarDecl const* stmt)
|
|
{
|
|
if (ignoreLocation(stmt))
|
|
return true;
|
|
if (stmt->getInit())
|
|
{
|
|
auto expr = IgnoreImplicitAndConversionOperator(stmt->getInit());
|
|
MarkIfAssignment(expr);
|
|
if (auto cxxConstruct = dyn_cast<CXXConstructExpr>(expr))
|
|
{
|
|
if (cxxConstruct->getNumArgs() == 1)
|
|
MarkIfAssignment(cxxConstruct->getArg(0));
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool BuriedAssign::VisitCXXFoldExpr(CXXFoldExpr const* stmt)
|
|
{
|
|
if (ignoreLocation(stmt))
|
|
return true;
|
|
MarkConditionForControlLoops(stmt->getLHS());
|
|
MarkConditionForControlLoops(stmt->getRHS());
|
|
return true;
|
|
}
|
|
|
|
// off by default because it uses getParentStmt so it's more expensive to run
|
|
loplugin::Plugin::Registration<BuriedAssign> X("buriedassign", false);
|
|
}
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|