compilerplugins/clang/salunicodeliteral.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   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 #ifndef LO_CLANG_SHARED_PLUGINS
  10
  11 #include "check.hxx"
  12 #include "plugin.hxx"
  13
  14 namespace {
  15
  16 bool isAsciiCharacterLiteral(Expr const * expr) {
  17     if (auto const e = dyn_cast<CharacterLiteral>(expr)) {
  18         return e->getKind() == CharacterLiteral::Ascii;
  19     }
  20     return false;
  21 }
  22
  23 class SalUnicodeLiteral final:
  24     public loplugin::FilteringPlugin<SalUnicodeLiteral>
  25 {
  26 public:
  27     explicit SalUnicodeLiteral(loplugin::InstantiationData const & data):
  28         FilteringPlugin(data) {}
  29
  30     bool VisitCXXStaticCastExpr(CXXStaticCastExpr const * expr) {
  31         check(expr);
  32         return true;
  33     }
  34
  35     bool VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr const * expr) {
  36         check(expr);
  37         return true;
  38     }
  39
  40     bool VisitCStyleCastExpr(CStyleCastExpr const * expr) {
  41         check(expr);
  42         return true;
  43     }
  44
  45     bool preRun() override {
  46         return compiler.getLangOpts().CPlusPlus
  47             && compiler.getPreprocessor().getIdentifierInfo(
  48                 "LIBO_INTERNAL_ONLY")->hasMacroDefinition();
  49     }
  50
  51     void run() override {
  52         if (preRun())
  53             TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
  54     }
  55
  56 private:
  57     void check(ExplicitCastExpr const * expr) {
  58         if (ignoreLocation(expr)
  59             || isInUnoIncludeFile(expr->getExprLoc()))
  60                 //TODO: '#ifdef LIBO_INTERNAL_ONLY' within UNO include files
  61         {
  62             return;
  63         }
  64         for (auto t = expr->getTypeAsWritten();;) {
  65             auto const tt = t->getAs<TypedefType>();
  66             if (tt == nullptr) {
  67                 return;
  68             }
  69             if (loplugin::TypeCheck(t).Typedef("sal_Unicode")
  70                 .GlobalNamespace())
  71             {
  72                 break;
  73             }
  74             t = tt->desugar();
  75         }
  76         auto const e1 = expr->getSubExprAsWritten();
  77         auto const loc = compat::getBeginLoc(e1);
  78         if (loc.isMacroID()
  79             && compiler.getSourceManager().isAtStartOfImmediateMacroExpansion(
  80                 loc))
  81         {
  82             return;
  83         }
  84         auto const e2 = e1->IgnoreParenImpCasts();
  85         if (isAsciiCharacterLiteral(e2) || isa<IntegerLiteral>(e2)) {
  86             report(
  87                 DiagnosticsEngine::Warning,
  88                 ("in LIBO_INTERNAL_ONLY code, replace literal cast to %0 with a"
  89                  " u'...' char16_t character literal"),
  90                 e2->getExprLoc())
  91                 << expr->getTypeAsWritten() << expr->getSourceRange();
  92         }
  93     }
  94 };
  95
  96 static loplugin::Plugin::Registration<SalUnicodeLiteral> salunicodeliteral("salunicodeliteral");
  97
  98 } // namespace
  99
 100 #endif // LO_CLANG_SHARED_PLUGINS
 101
 102 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */