72 lines
2.4 KiB
C++
72 lines
2.4 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 <string>
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#include "plugin.hxx"
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// Find places where OUString and OString are passed by value.
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// It's not very efficient, because we generally end up copying it twice - once into the parameter and
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// again into the destination OUString.
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// They should rather be passed by reference.
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namespace {
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class PassStringByRef:
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public RecursiveASTVisitor<PassStringByRef>, public loplugin::Plugin
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{
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public:
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explicit PassStringByRef(InstantiationData const & data): Plugin(data) {}
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virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
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bool VisitFunctionDecl(const FunctionDecl * decl);
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};
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bool PassStringByRef::VisitFunctionDecl(const FunctionDecl * functionDecl) {
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if (ignoreLocation(functionDecl)) {
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return true;
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}
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// only warn on the definition/prototype of the function,
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// not on the function implementation
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if (functionDecl->isThisDeclarationADefinition() && functionDecl->getPreviousDecl() != nullptr) {
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return true;
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}
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unsigned n = functionDecl->getNumParams();
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for (unsigned i = 0; i != n; ++i) {
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const ParmVarDecl * pvDecl = functionDecl->getParamDecl(i);
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QualType t1 { pvDecl->getType() };
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if (!t1->isClassType()) {
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continue;
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}
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string typeName = t1.getUnqualifiedType().getCanonicalType().getAsString();
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if (typeName == "class rtl::OUString") {
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report(
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DiagnosticsEngine::Warning,
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"passing OUString by value, rather pass by reference",
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pvDecl->getSourceRange().getBegin())
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<< pvDecl->getSourceRange();
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}
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else if (typeName == "class rtl::OString") {
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report(
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DiagnosticsEngine::Warning,
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"passing OString by value, rather pass by reference",
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pvDecl->getSourceRange().getBegin())
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<< pvDecl->getSourceRange();
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}
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}
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return true;
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}
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loplugin::Plugin::Registration< PassStringByRef > X("passstringbyref");
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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