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/* -*- 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 "config_clang.h"
#include "compat.hxx"
#include "plugin.hxx"
#include <fstream>
/**
Look for classes that are final i.e. nothing extends them, and have either
(a) protected fields or members.
or
(b) virtual members
In the case of (a), those members/fields can be made private.
In the case of (b), making the class final means the compiler can devirtualise
some method calls
The process goes something like this:
$ make check
$ make FORCE_COMPILE=all 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(loplugin::InstantiationData const & data):
Plugin(data) {}
virtual void run() override
{
handler.enableTreeWideAnalysisMode();
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 auto & s : definitionMap)
output += "definition:\t" + s.first + "\t" + s.second + "\n";
std::ofstream myfile;
myfile.open( WORKDIR "/loplugin.finalclasses.log", std::ios::app | std::ios::out);
myfile << output;
myfile.close();
}
bool shouldVisitTemplateInstantiations () const { return true; }
bool shouldVisitImplicitCode() const { return true; }
bool VisitCXXRecordDecl( const CXXRecordDecl* decl);
private:
void checkBase(QualType qt);
};
bool ignoreClass(StringRef s)
{
// ignore stuff in the standard library, and UNO stuff we can't touch.
if (compat::starts_with(s, "rtl::") || compat::starts_with(s, "sal::")
|| compat::starts_with(s, "com::sun::") || compat::starts_with(s, "std::")
|| compat::starts_with(s, "boost::")
|| s == "OString" || s == "OUString" || s == "bad_alloc")
{
return true;
}
return false;
}
bool FinalClasses::VisitCXXRecordDecl(const CXXRecordDecl* decl)
{
if (ignoreLocation(decl))
return true;
if (!decl->hasDefinition())
return true;
for (auto it = decl->bases_begin(); it != decl->bases_end(); ++it)
{
const CXXBaseSpecifier spec = *it;
checkBase(spec.getType());
}
for (auto it = decl->vbases_begin(); it != decl->vbases_end(); ++it)
{
const CXXBaseSpecifier spec = *it;
checkBase(spec.getType());
}
if (decl->hasAttr<FinalAttr>())
return true;
bool bFoundVirtual = false;
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;
if ( i->isVirtual() )
bFoundVirtual = true;
}
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 && !bFoundVirtual)
return true;
std::string s = decl->getQualifiedNameAsString();
if (ignoreClass(s))
return true;
SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(decl->getBeginLoc());
auto const filename = getFilenameOfLocation(spellingLocation);
auto sourceLocation = filename.substr(strlen(SRCDIR)).str() + ":"
+ std::to_string(compiler.getSourceManager().getSpellingLineNumber(spellingLocation));
definitionMap.insert( std::pair<std::string,std::string>(s, sourceLocation) );
return true;
}
void FinalClasses::checkBase(QualType baseType)
{
// need to look through typedefs, hence the getUnqualifiedDesugaredType
baseType = baseType.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 );
}
loplugin::Plugin::Registration< FinalClasses > X("finalclasses", false);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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