diff options
author | Noel Grandin <noel.grandin@collabora.co.uk> | 2017-10-03 09:17:35 +0200 |
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committer | Noel Grandin <noel.grandin@collabora.co.uk> | 2017-10-03 11:15:47 +0200 |
commit | ccb1894c02d77ed89741ca1f82bad87a17fd76fa (patch) | |
tree | 1c138d10e381522bd736b1499aabbf4766a87678 /compilerplugins/clang/finalclasses.cxx | |
parent | 419ae5765ac562982f843adbfff32154e2559162 (diff) |
new loplugin:finalclasses
look for classes which are effectively final, but contain protected
members. These members can be made private.
Change-Id: If53d535b068b668d1aff548ebfd0fe6c51a48a0e
Diffstat (limited to 'compilerplugins/clang/finalclasses.cxx')
-rw-r--r-- | compilerplugins/clang/finalclasses.cxx | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/compilerplugins/clang/finalclasses.cxx b/compilerplugins/clang/finalclasses.cxx new file mode 100644 index 000000000000..4b7a35804719 --- /dev/null +++ b/compilerplugins/clang/finalclasses.cxx @@ -0,0 +1,142 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#include <cassert> +#include <set> +#include <string> +#include <iostream> +#include "plugin.hxx" +#include <fstream> + +/** +Look for classes that are final i.e. nothing extends them, and have protected fields or members. + +These can be made private. + +The process goes something like this: + $ make check + $ make FORCE_COMPILE_ALL=1 COMPILER_PLUGIN_TOOL='FinalClasses' check + $ ./compilerplugins/clang/finalclasses.py + +*/ + +namespace { + +// try to limit the voluminous output a little +static std::set<std::string> inheritedFromSet; +static std::map<std::string,std::string> definitionMap; // className -> filename + +class FinalClasses: + public RecursiveASTVisitor<FinalClasses>, public loplugin::Plugin +{ +public: + explicit FinalClasses(InstantiationData const & data): Plugin(data) {} + + virtual void run() override + { + TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); + + // dump all our output in one write call - this is to try and limit IO "crosstalk" between multiple processes + // writing to the same logfile + std::string output; + for (const std::string & s : inheritedFromSet) + output += "inherited-from:\t" + s + "\n"; + for (const std::pair<std::string,std::string> & s : definitionMap) + output += "definition:\t" + s.first + "\t" + s.second + "\n"; + std::ofstream myfile; + myfile.open( SRCDIR "/loplugin.finalclasses.log", std::ios::app | std::ios::out); + myfile << output; + myfile.close(); + } + + bool shouldVisitTemplateInstantiations () const { return true; } + + bool VisitCXXRecordDecl( const CXXRecordDecl* decl); +}; + +bool startsWith(const std::string& rStr, const char* pSubStr) { + return rStr.compare(0, strlen(pSubStr), pSubStr) == 0; +} + +bool ignoreClass(StringRef s) +{ + // ignore stuff in the standard library, and UNO stuff we can't touch. + if (startsWith(s, "rtl::") || startsWith(s, "sal::") || startsWith(s, "com::sun::") + || startsWith(s, "std::") || startsWith(s, "boost::") + || s == "OString" || s == "OUString" || s == "bad_alloc") + { + return true; + } + return false; +} + +bool FinalClasses::VisitCXXRecordDecl(const CXXRecordDecl* decl) +{ + if (ignoreLocation(decl)) + return true; + decl = decl->getCanonicalDecl(); + if (!decl->isThisDeclarationADefinition()) + return true; + + for (auto it = decl->bases_begin(); it != decl->bases_end(); ++it) + { + const CXXBaseSpecifier spec = *it; + // need to look through typedefs, hence the getUnqualifiedDesugaredType + QualType baseType = spec.getType().getDesugaredType(compiler.getASTContext()); + std::string x; + // so that we get just the template name, excluding the template parameters + if (baseType->isRecordType()) + x = baseType->getAsCXXRecordDecl()->getQualifiedNameAsString(); + else if (auto templateType = baseType->getAs<TemplateSpecializationType>()) + x = templateType->getTemplateName().getAsTemplateDecl()->getQualifiedNameAsString(); + else + x = baseType.getAsString(); + inheritedFromSet.insert( x ); + } + + bool bFoundProtected = false; + for (auto it = decl->method_begin(); it != decl->method_end(); ++it) { + auto i = *it; + // ignore methods that are overriding base-class methods, making them private + // isn't useful + if ( !i->hasAttr<OverrideAttr>() && i->getAccess() == AS_protected ) { + bFoundProtected = true; + break; + } + } + if (!bFoundProtected) + { + for (auto it = decl->field_begin(); it != decl->field_end(); ++it) { + auto i = *it; + if ( i->getAccess() == AS_protected ) { + bFoundProtected = true; + break; + } + } + } + if (!bFoundProtected) + return true; + + std::string s = decl->getQualifiedNameAsString(); + if (ignoreClass(s)) + return true; + + SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(decl->getLocStart()); + std::string filename = compiler.getSourceManager().getFilename(spellingLocation); + auto sourceLocation = filename.substr(strlen(SRCDIR)) + ":" + + std::to_string(compiler.getSourceManager().getSpellingLineNumber(spellingLocation)); + definitionMap.insert( std::pair<std::string,std::string>(s, sourceLocation) ); + return true; +} + +loplugin::Plugin::Registration< FinalClasses > X("finalclasses", false); + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |