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 
isAsciiCharacterLiteral(Expr const * expr)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:
SalUnicodeLiteral(loplugin::InstantiationData const & data)27     explicit SalUnicodeLiteral(loplugin::InstantiationData const & data):
28         FilteringPlugin(data) {}
29 
VisitCXXStaticCastExpr(CXXStaticCastExpr const * expr)30     bool VisitCXXStaticCastExpr(CXXStaticCastExpr const * expr) {
31         check(expr);
32         return true;
33     }
34 
VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr const * expr)35     bool VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr const * expr) {
36         check(expr);
37         return true;
38     }
39 
VisitCStyleCastExpr(CStyleCastExpr const * expr)40     bool VisitCStyleCastExpr(CStyleCastExpr const * expr) {
41         check(expr);
42         return true;
43     }
44 
preRun()45     bool preRun() override {
46         return compiler.getLangOpts().CPlusPlus
47             && compiler.getPreprocessor().getIdentifierInfo(
48                 "LIBO_INTERNAL_ONLY")->hasMacroDefinition();
49     }
50 
run()51     void run() override {
52         if (preRun())
53             TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
54     }
55 
56 private:
check(ExplicitCastExpr const * expr)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: */
103