89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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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 <stack>
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#include "check.hxx"
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#include "plugin.hxx"
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// In C++, find implicit conversions from char16_t (aka sal_Unicode) to char.
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// Such places are probably meant to properly work on char16_t instead.
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namespace {
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class Visitor final:
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public RecursiveASTVisitor<Visitor>, public loplugin::Plugin
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{
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public:
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explicit Visitor(InstantiationData const & data): Plugin(data) {}
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bool TraverseCStyleCastExpr(CStyleCastExpr * expr) {
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subExprs_.push(expr->getSubExpr());
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bool ret = RecursiveASTVisitor::TraverseCStyleCastExpr(expr);
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subExprs_.pop();
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return ret;
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}
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bool TraverseCXXStaticCastExpr(CXXStaticCastExpr * expr) {
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subExprs_.push(expr->getSubExpr());
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bool ret = RecursiveASTVisitor::TraverseCXXStaticCastExpr(expr);
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subExprs_.pop();
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return ret;
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}
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bool TraverseCXXFunctionalCastExpr(CXXFunctionalCastExpr * expr) {
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subExprs_.push(expr->getSubExpr());
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bool ret = RecursiveASTVisitor::TraverseCXXFunctionalCastExpr(expr);
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subExprs_.pop();
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return ret;
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}
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bool VisitImplicitCastExpr(ImplicitCastExpr const * expr) {
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if ((!subExprs_.empty() && expr == subExprs_.top())
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|| ignoreLocation(expr))
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{
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return true;
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}
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if (!(loplugin::TypeCheck(expr->getType()).Char()
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&& expr->getSubExpr()->getType()->isSpecificBuiltinType(
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clang::BuiltinType::Char16)))
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{
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return true;
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}
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APSInt res;
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if (expr->getSubExpr()->EvaluateAsInt(res, compiler.getASTContext())
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&& res >= 0 && res <= 0x7F)
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{
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return true;
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}
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report(
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DiagnosticsEngine::Warning,
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"suspicious implicit cast from %0 to %1",
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expr->getExprLoc())
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<< expr->getSubExpr()->getType() << expr->getType()
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<< expr->getSourceRange();
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return true;
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}
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private:
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void run() override {
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if (compiler.getLangOpts().CPlusPlus) {
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TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
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}
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}
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std::stack<Expr const *> subExprs_;
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};
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static loplugin::Plugin::Registration<Visitor> reg("unicodetochar");
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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