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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 <string>
#include <set>
#include "plugin.hxx"
// Find places where we are returning a pointer to something, where we can be returning a reference.
// e.g.
// class A {
// struct X x;
// public:
// X* getX() { return &x; }
// }
// which can be:
// X& getX() { return x; }
namespace {
class ReturnByRef:
public loplugin::FilteringPlugin<ReturnByRef>
{
public:
explicit ReturnByRef(InstantiationData const & data): FilteringPlugin(data) {}
virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
bool VisitCXXMethodDecl(const CXXMethodDecl * decl);
private:
std::string getFilename(SourceLocation loc);
};
bool ReturnByRef::VisitCXXMethodDecl(const CXXMethodDecl * functionDecl) {
if (ignoreLocation(functionDecl)) {
return true;
}
if (functionDecl->isVirtual()) {
return true;
}
if (!functionDecl->isInstance()) {
return true;
}
if (!functionDecl->hasBody()) {
return true;
}
// ignore stuff that forms part of the stable URE interface
if (isInUnoIncludeFile(functionDecl)) {
return true;
}
QualType t1 { functionDecl->getReturnType() };
if (!t1->isPointerType()) {
return true;
}
// Ignore stuff like:
// operator vcl::Window *(){ return &m_rWindow; }
if (dyn_cast< CXXConversionDecl >( functionDecl ) != nullptr) {
return true;
}
std::string aFilename = getFilename(functionDecl->getCanonicalDecl()->getLocStart());
if (aFilename == SRCDIR "/include/o3tl/cow_wrapper.hxx")
{
return true;
}
if ( functionDecl->getNameAsString() == "operator->") {
return true;
}
std::string aFunctionName = functionDecl->getQualifiedNameAsString();
if (aFunctionName == "SbxValue::data") {
return true;
}
/*
std::string aParentName = functionDecl->getParent()->getQualifiedNameAsString();
std::string fqn = aParentName + "::" + functionDecl->getNameAsString();
if (aFilename == "TextCharAttribList::GetAttrib") {
return true;
}*/
/*
The AST here looks like:
-CompoundStmt
`-ReturnStmt
`-UnaryOperator
*/
const CompoundStmt* compoundStmt = dyn_cast< CompoundStmt >( functionDecl->getBody() );
if (compoundStmt == nullptr || compoundStmt->body_begin() == compoundStmt->body_end()) {
return true;
}
const ReturnStmt* returnStmt = dyn_cast<ReturnStmt>(*compoundStmt->child_begin());
if (returnStmt == nullptr) {
return true;
}
const Stmt* nextStmt = dyn_cast<Expr>(*returnStmt->child_begin())->IgnoreParens();
const UnaryOperator* unaryOperator = dyn_cast<UnaryOperator>(nextStmt);
if (unaryOperator == nullptr || unaryOperator->getOpcode() != UO_AddrOf) {
return true;
}
nextStmt->dump();
report(
DiagnosticsEngine::Warning,
"rather return by reference ",
functionDecl->getSourceRange().getBegin())
<< functionDecl->getSourceRange();
// display the location of the class member declaration so I don't have to search for it by hand
auto otherLoc = functionDecl->getCanonicalDecl()->getSourceRange().getBegin();
if (otherLoc != functionDecl->getSourceRange().getBegin())
{
report(
DiagnosticsEngine::Note,
"rather return by reference",
functionDecl->getCanonicalDecl()->getSourceRange().getBegin())
<< functionDecl->getCanonicalDecl()->getSourceRange();
}
return true;
}
std::string ReturnByRef::getFilename(SourceLocation loc)
{
SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(loc);
return compiler.getSourceManager().getFilename(spellingLocation);
}
loplugin::Plugin::Registration< ReturnByRef > X("returnbyref");
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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