117 lines
3.7 KiB
C++
117 lines
3.7 KiB
C++
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/* -*- 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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#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 <clang/AST/CXXInheritance.h>
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#include "compat.hxx"
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#include "plugin.hxx"
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namespace
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{
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class SimplifyDynamicCast : public RecursiveASTVisitor<SimplifyDynamicCast>, public loplugin::Plugin
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{
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public:
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explicit SimplifyDynamicCast(loplugin::InstantiationData const& data)
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: Plugin(data)
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{
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}
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virtual void run() override
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{
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// StringRef fn( compiler.getSourceManager().getFileEntryForID(
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// compiler.getSourceManager().getMainFileID())->getName() );
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// if (loplugin::isSamePathname(fn, WORKDIR "/YaccTarget/unoidl/source/sourceprovider-parser.cxx"))
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// return;
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TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
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}
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bool TraverseIfStmt(IfStmt*);
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bool VisitCXXStaticCastExpr(CXXStaticCastExpr const*);
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private:
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std::vector<QualType> dynamicCastVec;
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std::vector<Decl const*> dynamicCastSubExprVec;
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std::vector<IfStmt const*> ifVec;
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};
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bool SimplifyDynamicCast::TraverseIfStmt(IfStmt* ifStmt)
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{
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auto condExpr = ifStmt->getCond()->IgnoreParenImpCasts();
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auto dynamicCastExpr = dyn_cast<CXXDynamicCastExpr>(condExpr);
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if (!dynamicCastExpr)
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{
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if (auto binaryOp = dyn_cast<BinaryOperator>(condExpr))
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{
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if (binaryOp->getOpcode() == BO_NE)
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dynamicCastExpr
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= dyn_cast<CXXDynamicCastExpr>(binaryOp->getLHS()->IgnoreParenImpCasts());
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}
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}
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Decl const* subExprDecl = nullptr;
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if (dynamicCastExpr)
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{
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auto subExprDeclRefExpr
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= dyn_cast<DeclRefExpr>(dynamicCastExpr->getSubExpr()->IgnoreParenImpCasts());
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if (!subExprDeclRefExpr)
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dynamicCastExpr = nullptr;
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else
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subExprDecl = subExprDeclRefExpr->getDecl();
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}
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if (dynamicCastExpr)
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{
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auto qt = dynamicCastExpr->getTypeAsWritten();
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dynamicCastVec.push_back(qt);
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dynamicCastSubExprVec.push_back(subExprDecl);
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ifVec.push_back(ifStmt);
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}
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bool ret = RecursiveASTVisitor::TraverseIfStmt(ifStmt);
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if (dynamicCastExpr)
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{
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dynamicCastVec.pop_back();
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dynamicCastSubExprVec.pop_back();
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ifVec.pop_back();
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}
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return ret;
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}
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bool SimplifyDynamicCast::VisitCXXStaticCastExpr(CXXStaticCastExpr const* staticCastExpr)
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{
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if (ignoreLocation(staticCastExpr))
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return true;
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if (dynamicCastVec.empty())
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return true;
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auto qt = staticCastExpr->getTypeAsWritten();
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auto it = std::find(dynamicCastVec.begin(), dynamicCastVec.end(), qt);
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if (it == dynamicCastVec.end())
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return true;
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int idx = it - dynamicCastVec.begin();
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auto subExprDecl = dyn_cast<DeclRefExpr>(staticCastExpr->getSubExpr()->IgnoreParenImpCasts());
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if (!subExprDecl)
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return true;
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if (dynamicCastSubExprVec[idx] != subExprDecl->getDecl())
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return true;
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report(DiagnosticsEngine::Warning, "simplify, use var in if", staticCastExpr->getLocStart())
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<< staticCastExpr->getSourceRange();
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auto ifStmt = ifVec[idx];
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report(DiagnosticsEngine::Note, "if here", ifStmt->getLocStart()) << ifStmt->getSourceRange();
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return true;
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}
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loplugin::Plugin::Registration<SimplifyDynamicCast> X("simplifydynamiccast", true);
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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