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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/.
*/
#ifndef LO_CLANG_SHARED_PLUGINS
#include <cassert>
#include <string>
#include <iostream>
#include <fstream>
#include <set>
#include <clang/AST/CXXInheritance.h>
#include "check.hxx"
#include "plugin.hxx"
/**
* Look for a mistake I made (a lot) at one point where we assign a reference to a reference var, which
* does not do at all what I thought.
*/
namespace
{
class RefAssign : public loplugin::FilteringPlugin<RefAssign>
{
public:
explicit RefAssign(loplugin::InstantiationData const& data)
: FilteringPlugin(data)
{
}
virtual bool preRun() override
{
StringRef fn(handler.getMainFileName());
if (loplugin::isSamePathname(fn, SRCDIR "/comphelper/source/misc/syntaxhighlight.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/svl/source/numbers/zformat.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/tools/source/memtools/multisel.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/tools/source/generic/point.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/vcl/source/control/edit.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/vcl/source/control/fmtfield.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/vcl/source/control/field.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/vcl/source/control/field2.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/vcl/source/edit/textview.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/vcl/source/edit/vclmedit.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/editeng/source/editeng/editdoc.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/editeng/source/editeng/impedit2.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/svx/source/dialog/svxruler.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/sw/source/uibase/ribbar/inputwin.cxx"))
return false;
if (loplugin::isSamePathname(fn, SRCDIR "/sw/source/core/text/txtftn.cxx"))
return false;
return true;
}
virtual void run() override
{
if (preRun())
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
bool VisitBinaryOperator(BinaryOperator const*);
// causes crashes in CallExpr::getReturnType
bool TraverseFunctionTemplateDecl(FunctionTemplateDecl*) { return true; }
bool TraverseClassTemplateDecl(ClassTemplateDecl*) { return true; }
private:
clang::QualType ExtractType(Expr const*);
};
bool RefAssign::VisitBinaryOperator(BinaryOperator const* binaryOp)
{
if (ignoreLocation(binaryOp))
return true;
if (binaryOp->getOpcode() != BO_Assign)
return true;
// ignore assigning to/from an element of a collection
if (isa<CXXOperatorCallExpr>(binaryOp->getLHS()->IgnoreParenImpCasts()))
return true;
if (isa<CXXOperatorCallExpr>(binaryOp->getRHS()->IgnoreParenImpCasts()))
return true;
// if we are assigning to a parameter we probably mean it
if (auto declRefExpr = dyn_cast<DeclRefExpr>(binaryOp->getLHS()->IgnoreParenImpCasts()))
if (declRefExpr->getDecl() && isa<ParmVarDecl>(declRefExpr->getDecl()))
return true;
if (auto callExpr = dyn_cast<CallExpr>(binaryOp->getRHS()->IgnoreParenImpCasts()))
if (auto functionDecl = dyn_cast_or_null<FunctionDecl>(callExpr->getCalleeDecl()))
if (functionDecl->getIdentifier()
&& (functionDecl->getName() == "min" || functionDecl->getName() == "max"))
return true;
auto lhsType = ExtractType(binaryOp->getLHS());
auto rhsType = ExtractType(binaryOp->getRHS());
if (!loplugin::TypeCheck(lhsType).LvalueReference())
return true;
if (!loplugin::TypeCheck(rhsType).LvalueReference())
return true;
binaryOp->dump();
report(DiagnosticsEngine::Warning,
"assigning a %0 to a var of type %1 probably does not do what you think",
binaryOp->getBeginLoc())
<< rhsType << lhsType << binaryOp->getSourceRange();
return true;
}
clang::QualType RefAssign::ExtractType(Expr const* expr)
{
expr = expr->IgnoreParenImpCasts();
if (auto declReflExpr = dyn_cast<DeclRefExpr>(expr))
{
if (auto varDecl = dyn_cast<VarDecl>(declReflExpr->getDecl()))
return varDecl->getType();
}
else if (auto callExpr = dyn_cast<CallExpr>(expr))
{
if (callExpr->isTypeDependent())
return {};
// callExpr->dump();
return callExpr->getCallReturnType(compiler.getASTContext());
}
return expr->getType();
}
loplugin::Plugin::Registration<RefAssign> refassign("refassign");
} // namespace
#endif // LO_CLANG_SHARED_PLUGINS
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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