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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 "plugin.hxx"
#include <fstream>
/**
Idea from Norbert (shm_get) - look for classes that are
(a) not instantiated
(b) have zero or one subclasses
and warn about them - would allow us to remove a bunch of abstract classes
that can be merged into one class and simplified.
Dump a list of
- unique classes that exist (A)
- unique classes that are instantiated (B)
- unique class-subclass relationships (C)
Then
let D = A minus B
for each class in D, look in C and count the entries, then dump it if no-entries == 1
The process goes something like this:
$ make check
$ make FORCE_COMPILE_ALL=1 COMPILER_PLUGIN_TOOL='mergeclasses' check
$ ./compilerplugins/clang/mergeclasses.py
FIXME exclude 'static-only' classes, which some people may use/have used instead of a namespace to tie together a bunch of functions
*/
namespace {
// try to limit the voluminous output a little
static std::set<std::string> instantiatedSet;
static std::set<std::pair<std::string,std::string> > childToParentClassSet; // childClassName -> parentClassName
static std::map<std::string,std::string> definitionMap; // className -> filename
class MergeClasses:
public RecursiveASTVisitor<MergeClasses>, public loplugin::Plugin
{
public:
explicit MergeClasses(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 : instantiatedSet)
output += "instantiated:\t" + s + "\n";
for (const std::pair<std::string,std::string> & s : childToParentClassSet)
output += "has-subclass:\t" + s.first + "\t" + s.second + "\n";
for (const std::pair<std::string,std::string> & s : definitionMap)
output += "definition:\t" + s.first + "\t" + s.second + "\n";
ofstream myfile;
myfile.open( SRCDIR "/loplugin.mergeclasses.log", ios::app | ios::out);
myfile << output;
myfile.close();
}
bool shouldVisitTemplateInstantiations () const { return true; }
bool VisitVarDecl(const VarDecl *);
bool VisitFieldDecl(const FieldDecl *);
bool VisitCXXConstructExpr( const CXXConstructExpr* var );
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;
}
// ignore instantiations of pointers and arrays
if (s.endswith("*") || s.endswith("]")) {
return true;
}
return false;
}
// check for implicit construction
bool MergeClasses::VisitVarDecl( const VarDecl* pVarDecl )
{
if (ignoreLocation(pVarDecl)) {
return true;
}
std::string s = pVarDecl->getType().getAsString();
if (!ignoreClass(s))
instantiatedSet.insert(s);
return true;
}
// check for implicit construction
bool MergeClasses::VisitFieldDecl( const FieldDecl* pFieldDecl )
{
if (ignoreLocation(pFieldDecl)) {
return true;
}
std::string s = pFieldDecl->getType().getAsString();
if (!ignoreClass(s))
instantiatedSet.insert(s);
return true;
}
bool MergeClasses::VisitCXXConstructExpr( const CXXConstructExpr* pCXXConstructExpr )
{
if (ignoreLocation(pCXXConstructExpr)) {
return true;
}
// ignore calls when a sub-class is constructing its superclass
if (pCXXConstructExpr->getConstructionKind() != CXXConstructExpr::ConstructionKind::CK_Complete) {
return true;
}
const CXXConstructorDecl* pCXXConstructorDecl = pCXXConstructExpr->getConstructor();
const CXXRecordDecl* pParentCXXRecordDecl = pCXXConstructorDecl->getParent();
std::string s = pParentCXXRecordDecl->getQualifiedNameAsString();
if (!ignoreClass(s))
instantiatedSet.insert(s);
return true;
}
bool MergeClasses::VisitCXXRecordDecl(const CXXRecordDecl* decl)
{
if (ignoreLocation(decl)) {
return true;
}
if (decl->isThisDeclarationADefinition())
{
SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(decl->getCanonicalDecl()->getLocStart());
std::string filename = compiler.getSourceManager().getFilename(spellingLocation);
filename = filename.substr(strlen(SRCDIR));
std::string s = decl->getQualifiedNameAsString();
if (ignoreClass(s))
return true;
definitionMap.insert( std::pair<std::string,std::string>(s, filename) );
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());
childToParentClassSet.insert( std::pair<std::string,std::string>(s, baseType.getAsString()) );
}
}
return true;
}
loplugin::Plugin::Registration< MergeClasses > X("mergeclasses", false);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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