9a13cff647
Change-Id: Id991cead4f01830eafd9cf8dd63b519ef07c9451 Reviewed-on: https://gerrit.libreoffice.org/23134 Reviewed-by: Stephan Bergmann <sbergman@redhat.com> Tested-by: Stephan Bergmann <sbergman@redhat.com>
228 lines
8.4 KiB
C++
228 lines
8.4 KiB
C++
/* -*- 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 <cassert>
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#include <string>
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#include <iostream>
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#include <set>
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#include "plugin.hxx"
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#include "compat.hxx"
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#include <fstream>
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/**
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Dump a list of virtual methods and a list of methods overriding virtual methods.
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Then we will post-process the 2 lists and find the set of virtual methods which don't need to be virtual.
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The process goes something like this:
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$ make check
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$ make FORCE_COMPILE_ALL=1 COMPILER_PLUGIN_TOOL='unnecessaryvirtual' check
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$ ./compilerplugins/clang/unnecessaryvirtual.py unnecessaryvirtual.log > result.txt
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$ for dir in *; do make FORCE_COMPILE_ALL=1 UPDATE_FILES=$dir COMPILER_PLUGIN_TOOL='removevirtuals' $dir; done
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Note that the actual process may involve a fair amount of undoing, hand editing, and general messing around
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to get it to work :-)
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TODO some boost bind stuff appears to confuse it, notably in the xmloff module
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TODO does not find destructors that don't need to be virtual
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*/
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namespace {
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// try to limit the voluminous output a little
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static std::set<std::string> definitionSet;
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static std::set<std::string> overridingSet;
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class UnnecessaryVirtual:
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public RecursiveASTVisitor<UnnecessaryVirtual>, public loplugin::Plugin
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{
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public:
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explicit UnnecessaryVirtual(InstantiationData const & data): Plugin(data) {}
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virtual void run() override
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{
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TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
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// dump all our output in one write call - this is to try and limit IO "crosstalk" between multiple processes
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// writing to the same logfile
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std::string output;
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for (const std::string & s : definitionSet)
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output += "definition:\t" + s + "\n";
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for (const std::string & s : overridingSet)
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output += "overriding:\t" + s + "\n";
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ofstream myfile;
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myfile.open( SRCDIR "/unnecessaryvirtual.log", ios::app | ios::out);
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myfile << output;
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myfile.close();
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}
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bool shouldVisitTemplateInstantiations () const { return true; }
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bool VisitCXXMethodDecl( const CXXMethodDecl* decl );
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bool VisitCallExpr(CallExpr* );
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private:
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std::string fullyQualifiedName(const FunctionDecl* functionDecl);
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};
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std::string niceName(const CXXMethodDecl* functionDecl)
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{
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std::string s =
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functionDecl->getParent()->getQualifiedNameAsString() + "::"
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+ compat::getReturnType(*functionDecl).getAsString() + "-"
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+ functionDecl->getNameAsString() + "(";
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for (const ParmVarDecl *pParmVarDecl : functionDecl->params()) {
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s += pParmVarDecl->getType().getAsString();
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s += ",";
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}
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s += ")";
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if (functionDecl->isConst()) {
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s += "const";
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}
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return s;
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}
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std::string UnnecessaryVirtual::fullyQualifiedName(const FunctionDecl* functionDecl)
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{
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std::string ret = compat::getReturnType(*functionDecl).getCanonicalType().getAsString();
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ret += " ";
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if (isa<CXXMethodDecl>(functionDecl)) {
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const CXXRecordDecl* recordDecl = dyn_cast<CXXMethodDecl>(functionDecl)->getParent();
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ret += recordDecl->getQualifiedNameAsString();
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ret += "::";
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}
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ret += functionDecl->getNameAsString() + "(";
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bool bFirst = true;
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for (const ParmVarDecl *pParmVarDecl : functionDecl->params()) {
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if (bFirst)
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bFirst = false;
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else
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ret += ",";
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ret += pParmVarDecl->getType().getCanonicalType().getAsString();
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}
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ret += ")";
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if (isa<CXXMethodDecl>(functionDecl) && dyn_cast<CXXMethodDecl>(functionDecl)->isConst()) {
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ret += " const";
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}
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return ret;
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}
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bool UnnecessaryVirtual::VisitCXXMethodDecl( const CXXMethodDecl* methodDecl )
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{
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methodDecl = methodDecl->getCanonicalDecl();
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std::string aNiceName = niceName(methodDecl);
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// for destructors, we need to check if any of the superclass' destructors are virtual
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if (isa<CXXDestructorDecl>(methodDecl)) {
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/* TODO I need to check if the base class has any virtual functions, since overriding
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classes will simply get a compiler-provided virtual destructor by default.
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if (!methodDecl->isVirtual() && !methodDecl->isPure()) {
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return true;
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}
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std::set<std::string> overriddenSet;
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const CXXRecordDecl *pRecordDecl = methodDecl->getParent();
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for(auto baseSpecifier = pRecordDecl->bases_begin();
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baseSpecifier != pRecordDecl->bases_end(); ++baseSpecifier)
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{
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if (baseSpecifier->getType()->isRecordType())
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{
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const CXXRecordDecl *pSuperclassCXXRecordDecl = baseSpecifier->getType()->getAsCXXRecordDecl();
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if (pSuperclassCXXRecordDecl->getDestructor())
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{
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std::string aOverriddenNiceName = niceName(pSuperclassCXXRecordDecl->getDestructor());
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overriddenSet.insert(aOverriddenNiceName);
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}
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}
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}
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if (overriddenSet.empty()) {
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cout << "definition:\t" << aNiceName << endl;
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} else {
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for(std::string s : overriddenSet)
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cout << "overriding:\t" << s << endl;
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}*/
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return true;
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}
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if (!methodDecl->isVirtual()) {
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return true;
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}
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if (methodDecl->size_overridden_methods() == 0) {
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// ignore stuff that forms part of the stable URE interface
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if (isInUnoIncludeFile(compiler.getSourceManager().getSpellingLoc(
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methodDecl->getNameInfo().getLoc()))) {
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return true;
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}
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// ignore templates and template instantiations,
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// I just cannot get clang to give me decent overriding method data out of them
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if (methodDecl->getParent()->getDescribedClassTemplate()
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|| methodDecl->getParent()->getTemplateInstantiationPattern())
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return true;
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if (aNiceName.find("processOpCode2") != std::string::npos)
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{
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methodDecl->dump();
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cout << "definition " << aNiceName << endl;
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}
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definitionSet.insert(aNiceName);
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} else {
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for (auto iter = methodDecl->begin_overridden_methods();
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iter != methodDecl->end_overridden_methods(); ++iter)
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{
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const CXXMethodDecl *overriddenMethod = *iter;
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// we only care about the first level override to establish that a virtual qualifier was useful.
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if (overriddenMethod->isPure() || overriddenMethod->size_overridden_methods() == 0) {
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std::string aOverriddenNiceName = niceName(overriddenMethod);
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overridingSet.insert(aOverriddenNiceName);
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if (aNiceName.find("processOpCode2") != std::string::npos)
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{
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methodDecl->dump();
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cout << "overriding " << aNiceName << endl;
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}
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}
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}
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}
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return true;
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}
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// prevent recursive templates from blowing up the stack
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static std::set<std::string> traversedFunctionSet;
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bool UnnecessaryVirtual::VisitCallExpr(CallExpr* expr)
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{
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// Note that I don't ignore ANYTHING here, because I want to get calls to my code that result
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// from template instantiation deep inside the STL and other external code
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FunctionDecl* calleeFunctionDecl = expr->getDirectCallee();
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if (calleeFunctionDecl == nullptr) {
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Expr* callee = expr->getCallee()->IgnoreParenImpCasts();
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DeclRefExpr* dr = dyn_cast<DeclRefExpr>(callee);
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if (dr) {
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calleeFunctionDecl = dyn_cast<FunctionDecl>(dr->getDecl());
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if (calleeFunctionDecl)
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goto gotfunc;
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}
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return true;
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}
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gotfunc:
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// if we see a call to a function, it may effectively create new code,
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// if the function is templated. However, if we are inside a template function,
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// calling another function on the same template, the same problem occurs.
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// Rather than tracking all of that, just traverse anything we have not already traversed.
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if (traversedFunctionSet.insert(fullyQualifiedName(calleeFunctionDecl)).second)
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TraverseFunctionDecl(calleeFunctionDecl);
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return true;
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}
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loplugin::Plugin::Registration< UnnecessaryVirtual > X("unnecessaryvirtual", false);
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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