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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 "config_clang.h"
#include "plugin.hxx"
#include <fstream>
/**
Look for virtual methods where we never call the defining virtual method, and only call the overriding virtual
methods, which indicates a places where the virtual-ness is unwarranted, normally a result of premature abstraction.
The process goes something like this:
$ make check
$ make FORCE_COMPILE=all COMPILER_PLUGIN_TOOL='VirtualDown' check
$ ./compilerplugins/clang/VirtualDown.py
@TODO for some reason, we get false+ for operator== methods
@TODO some templates confuse it and we get false+
*/
namespace
{
struct MyFuncInfo
{
std::string name;
std::string sourceLocation;
};
bool operator<(const MyFuncInfo& lhs, const MyFuncInfo& rhs) { return lhs.name < rhs.name; }
// try to limit the voluminous output a little
static std::set<MyFuncInfo> definitionSet;
static std::set<std::string> callSet;
class VirtualDown : public loplugin::FilteringPlugin<VirtualDown>
{
public:
explicit VirtualDown(loplugin::InstantiationData const& data)
: FilteringPlugin(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 MyFuncInfo& s : definitionSet)
output += "definition:\t" + s.name + "\t" + s.sourceLocation + "\n";
for (const std::string& s : callSet)
output += "call:\t" + s + "\n";
std::ofstream myfile;
myfile.open(WORKDIR "/loplugin.virtualdown.log", std::ios::app | std::ios::out);
myfile << output;
myfile.close();
}
bool shouldVisitTemplateInstantiations() const { return true; }
bool shouldVisitImplicitCode() const { return true; }
bool VisitCXXMethodDecl(CXXMethodDecl const*);
bool VisitCXXMemberCallExpr(CXXMemberCallExpr const*);
bool TraverseFunctionDecl(FunctionDecl*);
bool TraverseCXXMethodDecl(CXXMethodDecl*);
bool TraverseCXXConversionDecl(CXXConversionDecl*);
bool TraverseCXXDeductionGuideDecl(CXXDeductionGuideDecl*);
private:
std::string toString(SourceLocation loc);
std::string niceName(const CXXMethodDecl* functionDecl);
FunctionDecl const* currentFunctionDecl = nullptr;
};
bool VirtualDown::VisitCXXMethodDecl(const CXXMethodDecl* methodDecl)
{
if (ignoreLocation(methodDecl))
{
return true;
}
if (!methodDecl->isThisDeclarationADefinition() || !methodDecl->isVirtual()
|| methodDecl->isDeleted())
{
return true;
}
methodDecl = methodDecl->getCanonicalDecl();
// ignore stuff that forms part of the stable URE interface
if (isInUnoIncludeFile(methodDecl))
{
return true;
}
std::string aNiceName = niceName(methodDecl);
if (isa<CXXDestructorDecl>(methodDecl))
return true;
if (isa<CXXConstructorDecl>(methodDecl))
return true;
if (methodDecl->size_overridden_methods() == 0)
definitionSet.insert({ aNiceName, toString(methodDecl->getLocation()) });
return true;
}
bool VirtualDown::VisitCXXMemberCallExpr(CXXMemberCallExpr const* 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 const* calleeFunctionDecl = expr->getDirectCallee();
if (calleeFunctionDecl == nullptr)
{
Expr const* callee = expr->getCallee()->IgnoreParenImpCasts();
DeclRefExpr const* dr = dyn_cast<DeclRefExpr>(callee);
if (dr)
{
calleeFunctionDecl = dyn_cast<FunctionDecl>(dr->getDecl());
if (calleeFunctionDecl)
goto gotfunc;
}
return true;
}
gotfunc:
// ignore recursive calls
if (currentFunctionDecl == calleeFunctionDecl)
return true;
auto cxxMethodDecl = dyn_cast<CXXMethodDecl>(calleeFunctionDecl);
if (!cxxMethodDecl)
return true;
while (cxxMethodDecl->getTemplateInstantiationPattern())
cxxMethodDecl = dyn_cast<CXXMethodDecl>(cxxMethodDecl->getTemplateInstantiationPattern());
while (cxxMethodDecl->getInstantiatedFromMemberFunction())
cxxMethodDecl = dyn_cast<CXXMethodDecl>(cxxMethodDecl->getInstantiatedFromMemberFunction());
if (cxxMethodDecl->getLocation().isValid() && !ignoreLocation(cxxMethodDecl))
callSet.insert(niceName(cxxMethodDecl));
return true;
}
bool VirtualDown::TraverseFunctionDecl(FunctionDecl* f)
{
auto copy = currentFunctionDecl;
currentFunctionDecl = f;
bool ret = RecursiveASTVisitor::TraverseFunctionDecl(f);
currentFunctionDecl = copy;
return ret;
}
bool VirtualDown::TraverseCXXMethodDecl(CXXMethodDecl* f)
{
auto copy = currentFunctionDecl;
currentFunctionDecl = f;
bool ret = RecursiveASTVisitor::TraverseCXXMethodDecl(f);
currentFunctionDecl = copy;
return ret;
}
bool VirtualDown::TraverseCXXConversionDecl(CXXConversionDecl* f)
{
auto copy = currentFunctionDecl;
currentFunctionDecl = f;
bool ret = RecursiveASTVisitor::TraverseCXXConversionDecl(f);
currentFunctionDecl = copy;
return ret;
}
bool VirtualDown::TraverseCXXDeductionGuideDecl(CXXDeductionGuideDecl* f)
{
auto copy = currentFunctionDecl;
currentFunctionDecl = f;
bool ret = RecursiveASTVisitor::TraverseCXXDeductionGuideDecl(f);
currentFunctionDecl = copy;
return ret;
}
std::string VirtualDown::niceName(const CXXMethodDecl* cxxMethodDecl)
{
std::string s = cxxMethodDecl->getReturnType().getCanonicalType().getAsString() + " "
+ cxxMethodDecl->getQualifiedNameAsString() + "(";
for (const ParmVarDecl* pParmVarDecl : cxxMethodDecl->parameters())
{
s += pParmVarDecl->getType().getCanonicalType().getAsString();
s += ",";
}
s += ")";
if (cxxMethodDecl->isConst())
{
s += "const";
}
return s;
}
std::string VirtualDown::toString(SourceLocation loc)
{
SourceLocation expansionLoc = compiler.getSourceManager().getExpansionLoc(loc);
StringRef name = getFilenameOfLocation(expansionLoc);
std::string sourceLocation
= std::string(name.substr(strlen(SRCDIR) + 1)) + ":"
+ std::to_string(compiler.getSourceManager().getSpellingLineNumber(expansionLoc));
loplugin::normalizeDotDotInFilePath(sourceLocation);
return sourceLocation;
}
loplugin::Plugin::Registration<VirtualDown> X("virtualdown", false);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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