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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 <string>
#include <iostream>
#include <set>
#include "plugin.hxx"
#include "compat.hxx"
#include <fstream>
/**
Dump a list of virtual methods and a list of methods overriding virtual methods.
Then we will post-process the 2 lists and find the set of virtual methods which don't need to be virtual.
The process goes something like this:
$ make check
$ make FORCE_COMPILE_ALL=1 COMPILER_PLUGIN_TOOL='unnecessaryvirtual' check
$ ./compilerplugins/clang/unnecessaryvirtual.py
$ for dir in *; do make FORCE_COMPILE_ALL=1 UPDATE_FILES=$dir COMPILER_PLUGIN_TOOL='removevirtuals' $dir; done
Note that the actual process may involve a fair amount of undoing, hand editing, and general messing around
to get it to work :-)
TODO some boost bind stuff appears to confuse it, notably in the xmloff module
TODO does not find destructors that don't need to be virtual
*/
namespace {
// try to limit the voluminous output a little
static std::set<std::string> definitionSet;
static std::set<std::string> overridingSet;
class UnnecessaryVirtual:
public RecursiveASTVisitor<UnnecessaryVirtual>, public loplugin::Plugin
{
public:
explicit UnnecessaryVirtual(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 : definitionSet)
output += "definition:\t" + s + "\n";
for (const std::string & s : overridingSet)
output += "overriding:\t" + s + "\n";
ofstream myfile;
myfile.open( SRCDIR "/loplugin.unnecessaryvirtual.log", ios::app | ios::out);
myfile << output;
myfile.close();
}
bool shouldVisitTemplateInstantiations () const { return true; }
bool VisitCXXMethodDecl( const CXXMethodDecl* decl );
bool VisitCallExpr(CallExpr* );
private:
std::string fullyQualifiedName(const FunctionDecl* functionDecl);
};
std::string niceName(const CXXMethodDecl* functionDecl)
{
std::string s =
functionDecl->getParent()->getQualifiedNameAsString() + "::"
+ compat::getReturnType(*functionDecl).getAsString() + "-"
+ functionDecl->getNameAsString() + "(";
for (const ParmVarDecl *pParmVarDecl : functionDecl->params()) {
s += pParmVarDecl->getType().getAsString();
s += ",";
}
s += ")";
if (functionDecl->isConst()) {
s += "const";
}
return s;
}
std::string UnnecessaryVirtual::fullyQualifiedName(const FunctionDecl* functionDecl)
{
std::string ret = compat::getReturnType(*functionDecl).getCanonicalType().getAsString();
ret += " ";
if (isa<CXXMethodDecl>(functionDecl)) {
const CXXRecordDecl* recordDecl = dyn_cast<CXXMethodDecl>(functionDecl)->getParent();
ret += recordDecl->getQualifiedNameAsString();
ret += "::";
}
ret += functionDecl->getNameAsString() + "(";
bool bFirst = true;
for (const ParmVarDecl *pParmVarDecl : functionDecl->params()) {
if (bFirst)
bFirst = false;
else
ret += ",";
ret += pParmVarDecl->getType().getCanonicalType().getAsString();
}
ret += ")";
if (isa<CXXMethodDecl>(functionDecl) && dyn_cast<CXXMethodDecl>(functionDecl)->isConst()) {
ret += " const";
}
return ret;
}
bool UnnecessaryVirtual::VisitCXXMethodDecl( const CXXMethodDecl* methodDecl )
{
methodDecl = methodDecl->getCanonicalDecl();
std::string aNiceName = niceName(methodDecl);
// for destructors, we need to check if any of the superclass' destructors are virtual
if (isa<CXXDestructorDecl>(methodDecl)) {
/* TODO I need to check if the base class has any virtual functions, since overriding
classes will simply get a compiler-provided virtual destructor by default.
if (!methodDecl->isVirtual() && !methodDecl->isPure()) {
return true;
}
std::set<std::string> overriddenSet;
const CXXRecordDecl *pRecordDecl = methodDecl->getParent();
for(auto baseSpecifier = pRecordDecl->bases_begin();
baseSpecifier != pRecordDecl->bases_end(); ++baseSpecifier)
{
if (baseSpecifier->getType()->isRecordType())
{
const CXXRecordDecl *pSuperclassCXXRecordDecl = baseSpecifier->getType()->getAsCXXRecordDecl();
if (pSuperclassCXXRecordDecl->getDestructor())
{
std::string aOverriddenNiceName = niceName(pSuperclassCXXRecordDecl->getDestructor());
overriddenSet.insert(aOverriddenNiceName);
}
}
}
if (overriddenSet.empty()) {
cout << "definition:\t" << aNiceName << endl;
} else {
for(std::string s : overriddenSet)
cout << "overriding:\t" << s << endl;
}*/
return true;
}
if (!methodDecl->isVirtual()) {
return true;
}
if (methodDecl->size_overridden_methods() == 0) {
// ignore stuff that forms part of the stable URE interface
if (isInUnoIncludeFile(compiler.getSourceManager().getSpellingLoc(
methodDecl->getNameInfo().getLoc()))) {
return true;
}
// ignore templates and template instantiations,
// I just cannot get clang to give me decent overriding method data out of them
if (methodDecl->getParent()->getDescribedClassTemplate()
|| methodDecl->getParent()->getTemplateInstantiationPattern())
return true;
if (aNiceName.find("processOpCode2") != std::string::npos)
{
methodDecl->dump();
cout << "definition " << aNiceName << endl;
}
definitionSet.insert(aNiceName);
} else {
for (auto iter = methodDecl->begin_overridden_methods();
iter != methodDecl->end_overridden_methods(); ++iter)
{
const CXXMethodDecl *overriddenMethod = *iter;
// we only care about the first level override to establish that a virtual qualifier was useful.
if (overriddenMethod->isPure() || overriddenMethod->size_overridden_methods() == 0) {
std::string aOverriddenNiceName = niceName(overriddenMethod);
overridingSet.insert(aOverriddenNiceName);
if (aNiceName.find("processOpCode2") != std::string::npos)
{
methodDecl->dump();
cout << "overriding " << aNiceName << endl;
}
}
}
}
return true;
}
// prevent recursive templates from blowing up the stack
static std::set<std::string> traversedFunctionSet;
bool UnnecessaryVirtual::VisitCallExpr(CallExpr* expr)
{
// Note that I don't ignore ANYTHING here, because I want to get calls to my code that result
// from template instantiation deep inside the STL and other external code
FunctionDecl* calleeFunctionDecl = expr->getDirectCallee();
if (calleeFunctionDecl == nullptr) {
Expr* callee = expr->getCallee()->IgnoreParenImpCasts();
DeclRefExpr* dr = dyn_cast<DeclRefExpr>(callee);
if (dr) {
calleeFunctionDecl = dyn_cast<FunctionDecl>(dr->getDecl());
if (calleeFunctionDecl)
goto gotfunc;
}
return true;
}
gotfunc:
// if we see a call to a function, it may effectively create new code,
// if the function is templated. However, if we are inside a template function,
// calling another function on the same template, the same problem occurs.
// Rather than tracking all of that, just traverse anything we have not already traversed.
if (traversedFunctionSet.insert(fullyQualifiedName(calleeFunctionDecl)).second)
TraverseFunctionDecl(calleeFunctionDecl);
return true;
}
loplugin::Plugin::Registration< UnnecessaryVirtual > X("unnecessaryvirtual", false);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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