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