compilerplugins/clang/staticmethods.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include "clang/AST/Attr.h"
  11
  12 #include "check.hxx"
  13 #include "plugin.hxx"
  14
  15 /*
  16   Look for member functions that can be static
  17 */
  18 namespace {
  19
  20 class StaticMethods:
  21     public loplugin::FilteringPlugin<StaticMethods>
  22 {
  23 private:
  24     bool bVisitedThis;
  25 public:
  26     explicit StaticMethods(loplugin::InstantiationData const & data): FilteringPlugin(data), bVisitedThis(false) {}
  27
  28     void run() override
  29     { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
  30
  31     bool TraverseCXXMethodDecl(const CXXMethodDecl * decl);
  32
  33     bool VisitCXXThisExpr(const CXXThisExpr *) { bVisitedThis = true; return true; }
  34     // these two indicate that we hit something that makes our analysis unreliable
  35     bool VisitUnresolvedMemberExpr(const UnresolvedMemberExpr *) { bVisitedThis = true; return true; }
  36     bool VisitCXXDependentScopeMemberExpr(const CXXDependentScopeMemberExpr *) { bVisitedThis = true; return true; }
  37 private:
  38     StringRef getFilename(SourceLocation loc);
  39 };
  40
  41 bool BaseCheckNotTestFixtureSubclass(const CXXRecordDecl *BaseDefinition) {
  42     if (loplugin::TypeCheck(BaseDefinition).Class("TestFixture").Namespace("CppUnit").GlobalNamespace()) {
  43         return false;
  44     }
  45     return true;
  46 }
  47
  48 bool isDerivedFromTestFixture(const CXXRecordDecl *decl) {
  49     if (!decl->hasDefinition())
  50         return false;
  51     if (// not sure what hasAnyDependentBases() does,
  52         // but it avoids classes we don't want, e.g. WeakAggComponentImplHelper1
  53         !decl->hasAnyDependentBases() &&
  54         !decl->forallBases(BaseCheckNotTestFixtureSubclass, true)) {
  55         return true;
  56     }
  57     return false;
  58 }
  59
  60 StringRef StaticMethods::getFilename(SourceLocation loc)
  61 {
  62     SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(loc);
  63     return getFilenameOfLocation(spellingLocation);
  64 }
  65
  66 bool startsWith(const std::string& rStr, const char* pSubStr) {
  67     return rStr.compare(0, strlen(pSubStr), pSubStr) == 0;
  68 }
  69
  70 bool StaticMethods::TraverseCXXMethodDecl(const CXXMethodDecl * pCXXMethodDecl) {
  71     if (ignoreLocation(pCXXMethodDecl)) {
  72         return true;
  73     }
  74     if (!pCXXMethodDecl->isInstance() || pCXXMethodDecl->isVirtual() || !pCXXMethodDecl->doesThisDeclarationHaveABody() || pCXXMethodDecl->isLateTemplateParsed()) {
  75         return true;
  76     }
  77     if (pCXXMethodDecl->getOverloadedOperator() != OverloadedOperatorKind::OO_None || pCXXMethodDecl->hasAttr<OverrideAttr>()) {
  78         return true;
  79     }
  80     if (isa<CXXConstructorDecl>(pCXXMethodDecl) || isa<CXXDestructorDecl>(pCXXMethodDecl) || isa<CXXConversionDecl>(pCXXMethodDecl)) {
  81         return true;
  82     }
  83     if (isInUnoIncludeFile(pCXXMethodDecl)) {
  84         return true;
  85     }
  86     if (pCXXMethodDecl->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
  87         return true;
  88
  89     // the CppUnit stuff uses macros and methods that can't be changed
  90     if (isDerivedFromTestFixture(pCXXMethodDecl->getParent())) {
  91         return true;
  92     }
  93     // don't mess with the backwards compatibility stuff
  94     if (loplugin::isSamePathname(getFilename(compat::getBeginLoc(pCXXMethodDecl)), SRCDIR "/cppuhelper/source/compat.cxx")) {
  95         return true;
  96     }
  97     // the DDE has a dummy implementation on Linux and a real one on Windows
  98     auto aFilename = getFilename(compat::getBeginLoc(pCXXMethodDecl->getCanonicalDecl()));
  99     if (loplugin::isSamePathname(aFilename, SRCDIR "/include/svl/svdde.hxx")) {
 100         return true;
 101     }
 102     auto cdc = loplugin::DeclCheck(pCXXMethodDecl->getParent());
 103     // special case having something to do with static initialisation
 104     // sal/osl/all/utility.cxx
 105     if (cdc.Class("OGlobalTimer").Namespace("osl").GlobalNamespace()) {
 106         return true;
 107     }
 108     // leave the TopLeft() method alone for consistency with the other "corner" methods
 109     if (cdc.Class("BitmapInfoAccess").GlobalNamespace()) {
 110         return true;
 111     }
 112     // the unotools and svl config code stuff is doing weird stuff with a reference-counted statically allocated pImpl class
 113     if (loplugin::hasPathnamePrefix(aFilename, SRCDIR "/include/unotools/")) {
 114         return true;
 115     }
 116     if (loplugin::hasPathnamePrefix(aFilename, SRCDIR "/include/svl/")) {
 117         return true;
 118     }
 119     if (loplugin::hasPathnamePrefix(aFilename, SRCDIR "/include/framework/") || loplugin::hasPathnamePrefix(aFilename, SRCDIR "/framework/")) {
 120         return true;
 121     }
 122     // there is some odd stuff happening here I don't fully understand, leave it for now
 123     if (loplugin::hasPathnamePrefix(aFilename, SRCDIR "/include/canvas/") || loplugin::hasPathnamePrefix(aFilename, SRCDIR "/canvas/")) {
 124         return true;
 125     }
 126     // classes that have static data and some kind of weird reference-counting trick in its constructor
 127     if (cdc.Class("LinguOptions").GlobalNamespace()
 128         || (cdc.Class("EditableExtendedColorConfig").Namespace("svtools")
 129             .GlobalNamespace())
 130         || (cdc.Class("ExtendedColorConfig").Namespace("svtools")
 131             .GlobalNamespace())
 132         || cdc.Class("SvtMiscOptions").GlobalNamespace()
 133         || cdc.Class("SvtAccessibilityOptions").GlobalNamespace()
 134         || cdc.Class("ColorConfig").Namespace("svtools").GlobalNamespace()
 135         || cdc.Class("SvtOptionsDrawinglayer").GlobalNamespace()
 136         || cdc.Class("SvtMenuOptions").GlobalNamespace()
 137         || cdc.Class("SvtToolPanelOptions").GlobalNamespace()
 138         || cdc.Class("SvtSlideSorterBarOptions").GlobalNamespace()
 139         || (cdc.Class("SharedResources").Namespace("connectivity")
 140             .GlobalNamespace())
 141         || (cdc.Class("OParseContextClient").Namespace("svxform")
 142             .GlobalNamespace())
 143         || cdc.Class("OLimitedFormats").Namespace("frm").GlobalNamespace())
 144     {
 145         return true;
 146     }
 147     auto fdc = loplugin::DeclCheck(pCXXMethodDecl);
 148     // only empty on Linux, not on windows
 149     if ((fdc.Function("GetVisualRepresentationInNativeFormat_Impl")
 150          .Class("OleEmbeddedObject").GlobalNamespace())
 151         || (fdc.Function("GetRidOfComponent").Class("OleEmbeddedObject")
 152             .GlobalNamespace())
 153         || (fdc.Function("isProfileLocked").Class("ProfileAccess")
 154             .Namespace("mozab").Namespace("connectivity").GlobalNamespace())
 155         || cdc.Class("SbxDecimal").GlobalNamespace()
 156         || fdc.Function("Call").Class("SbiDllMgr").GlobalNamespace()
 157         || fdc.Function("FreeDll").Class("SbiDllMgr").GlobalNamespace()
 158         || (fdc.Function("InitializeDde").Class("SfxApplication")
 159             .GlobalNamespace())
 160         || (fdc.Function("RemoveDdeTopic").Class("SfxApplication")
 161             .GlobalNamespace())
 162         || (fdc.Function("ReleaseData").Class("ScannerManager")
 163             .GlobalNamespace()))
 164     {
 165         return true;
 166     }
 167     // debugging stuff
 168     if (fdc.Function("dump").Class("InternalData").Namespace("chart")
 169         .GlobalNamespace())
 170     {
 171         return true;
 172     }
 173     // used in a function-pointer-table
 174     if ((cdc.Class("SbiRuntime").GlobalNamespace()
 175          && startsWith(pCXXMethodDecl->getNameAsString(), "Step"))
 176         || (cdc.Class("OoxFormulaParserImpl").Namespace("xls").Namespace("oox")
 177             .GlobalNamespace())
 178         || cdc.Class("SwTableFormula").GlobalNamespace()
 179         || (cdc.Class("BiffFormulaParserImpl").Namespace("xls").Namespace("oox")
 180             .GlobalNamespace())
 181         || (fdc.Function("Read_F_Shape").Class("SwWW8ImplReader")
 182             .GlobalNamespace())
 183         || (fdc.Function("Read_Majority").Class("SwWW8ImplReader")
 184             .GlobalNamespace())
 185         || fdc.Function("Ignore").Class("SwWrtShell").GlobalNamespace())
 186     {
 187         return true;
 188     }
 189     // have no idea why this can't be static, but 'make check' fails with it so...
 190     if (fdc.Function("resolveRelationshipsOfTypeFromOfficeDoc").Class("Shape")
 191         .Namespace("drawingml").Namespace("oox").GlobalNamespace())
 192     {
 193         return true;
 194     }
 195     // template magic
 196     if (fdc.Function("getValue").Class("ColumnBatch").GlobalNamespace()
 197         || cdc.Class("TitleImpl").GlobalNamespace()
 198         || (fdc.Function("getDefaultPropertyName").Class("DefaultReturnHelper")
 199             .Namespace("vba").Namespace("ooo").GlobalNamespace()))
 200     {
 201         return true;
 202     }
 203     // depends on config options
 204     if ((fdc.Function("autoInstallFontLangSupport").Class("PrintFontManager")
 205          .Namespace("psp").GlobalNamespace())
 206         || fdc.Function("AllocateFrame").Class("GtkSalFrame").GlobalNamespace()
 207         || (fdc.Function("TriggerPaintEvent").Class("GtkSalFrame")
 208             .GlobalNamespace()))
 209     {
 210         return true;
 211     }
 212
 213     bVisitedThis = false;
 214     TraverseStmt(pCXXMethodDecl->getBody());
 215     if (bVisitedThis) {
 216         return true;
 217     }
 218
 219     report(
 220         DiagnosticsEngine::Warning,
 221         "this member function can be declared static",
 222         pCXXMethodDecl->getCanonicalDecl()->getLocation())
 223       << pCXXMethodDecl->getCanonicalDecl()->getSourceRange();
 224     FunctionDecl const * def;
 225     if (pCXXMethodDecl->isDefined(def)
 226         && def != pCXXMethodDecl->getCanonicalDecl())
 227     {
 228         report(DiagnosticsEngine::Note, "defined here:", def->getLocation())
 229             << def->getSourceRange();
 230     }
 231     return true;
 232 }
 233
 234 loplugin::Plugin::Registration<StaticMethods> X("staticmethods");
 235
 236 }
 237
 238 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */