93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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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#ifndef LO_CLANG_SHARED_PLUGINS
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#include <cassert>
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#include <string>
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#include <iostream>
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#include <fstream>
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#include <set>
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#include "plugin.hxx"
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/**
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Check for places where we do
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if (xxx) ;
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or
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if (xxx) {}
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*/
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namespace
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{
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class EmptyIf : public loplugin::FilteringRewritePlugin<EmptyIf>
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{
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public:
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explicit EmptyIf(loplugin::InstantiationData const& data)
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: FilteringRewritePlugin(data)
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{
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}
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virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
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bool VisitIfStmt(IfStmt const*);
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private:
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bool ContainsComment(Stmt const*);
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};
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static bool empty(Stmt const* stmt)
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{
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if (isa<NullStmt>(stmt))
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return true;
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auto compoundStmt = dyn_cast<CompoundStmt>(stmt);
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if (!compoundStmt)
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return false;
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return compoundStmt->size() == 0;
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}
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bool EmptyIf::ContainsComment(Stmt const* stmt)
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{
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auto range = stmt->getSourceRange();
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SourceManager& SM = compiler.getSourceManager();
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SourceLocation startLoc = range.getBegin();
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SourceLocation endLoc = range.getEnd();
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char const* p1 = SM.getCharacterData(startLoc);
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char const* p2 = SM.getCharacterData(endLoc);
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p2 += Lexer::MeasureTokenLength(endLoc, SM, compiler.getLangOpts());
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auto s = llvm::StringRef(p1, p2 - p1);
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return s.find("//") != llvm::StringRef::npos || s.find("/*") != llvm::StringRef::npos
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|| s.find("#if") != llvm::StringRef::npos;
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}
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bool EmptyIf::VisitIfStmt(IfStmt const* ifStmt)
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{
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if (ignoreLocation(ifStmt))
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return true;
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if (ifStmt->getElse() && empty(ifStmt->getElse()) && !ContainsComment(ifStmt->getElse()))
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{
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report(DiagnosticsEngine::Warning, "empty else body", ifStmt->getElse()->getBeginLoc())
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<< ifStmt->getElse()->getSourceRange();
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return true;
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}
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if (!ifStmt->getElse() && empty(ifStmt->getThen()) && !ContainsComment(ifStmt->getThen()))
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{
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report(DiagnosticsEngine::Warning, "empty if body", ifStmt->getBeginLoc())
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<< ifStmt->getSourceRange();
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}
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return true;
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}
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loplugin::Plugin::Registration<EmptyIf> emptyif("emptyif", true);
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}
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#endif // LO_CLANG_SHARED_PLUGINS
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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