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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* 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 "check.hxx"
#include "compat.hxx"
#include "plugin.hxx"
/**
* Look for places where we are converting from type A through a conversion operator and back to type A,
* which is redundant. At the moment only look for Color, to aid my ColorData->Color conversion
*/
namespace
{
class DoubleConvert final : public loplugin::FilteringPlugin<DoubleConvert>
{
public:
explicit DoubleConvert(loplugin::InstantiationData const& data)
: FilteringPlugin(data)
{
}
void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
bool VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr const*);
};
/**
The AST looks like:
CXXOperatorCallExpr 0x8e5b840 'class Color' lvalue
|-ImplicitCastExpr 0x8e5b828 'class Color &(*)(class Color &&) noexcept' <FunctionToPointerDecay>
| `-DeclRefExpr 0x8e5b800 'class Color &(class Color &&) noexcept' lvalue CXXMethod 0x8e59a08 'operator=' 'class Color &(class Color &&) noexcept'
|-DeclRefExpr 0x8e5b678 'class Color' lvalue Var 0x8e5b5d0 'col2' 'class Color'
`-MaterializeTemporaryExpr 0x8e5b7e8 'class Color' xvalue
`-CXXConstructExpr 0x8e5b7b0 'class Color' 'void (ColorData)'
`-ImplicitCastExpr 0x8e5b798 'ColorData':'unsigned int' <IntegralCast>
`-CXXFunctionalCastExpr 0x8e5b770 'sal_Int32':'int' functional cast to sal_Int32 <NoOp>
`-ImplicitCastExpr 0x8e5b758 'sal_Int32':'int' <UserDefinedConversion>
`-CXXMemberCallExpr 0x8e5b730 'sal_Int32':'int'
`-MemberExpr 0x8e5b6f8 '<bound member function type>' .operator int 0x8e51048
`-ImplicitCastExpr 0x8e5b6e0 'const class Color' lvalue <NoOp>
`-DeclRefExpr 0x8e5b6b0 'class Color' lvalue Var 0x8e5b518 'col1' 'class Color'
*/
bool DoubleConvert::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr const* materializetemp)
{
if (ignoreLocation(materializetemp))
return true;
auto cxxConstruct
= dyn_cast<CXXConstructExpr>(compat::getSubExpr(materializetemp)->IgnoreParenCasts());
if (!cxxConstruct)
return true;
if (cxxConstruct->getNumArgs() == 0)
return true;
auto cxxMemberCallExpr
= dyn_cast<CXXMemberCallExpr>(cxxConstruct->getArg(0)->IgnoreParenCasts());
if (!cxxMemberCallExpr)
return true;
if (!isa<CXXConversionDecl>(cxxMemberCallExpr->getMethodDecl()))
return true;
if (materializetemp->getType().getCanonicalType().getTypePtr()
!= cxxMemberCallExpr->getImplicitObjectArgument()
->getType()
.getCanonicalType()
.getTypePtr())
return true;
if (!loplugin::TypeCheck(materializetemp->getType().getCanonicalType())
.Class("Color")
.GlobalNamespace())
return true;
report(DiagnosticsEngine::Warning, "redundant double conversion", materializetemp->getExprLoc())
<< materializetemp->getSourceRange();
return true;
}
static loplugin::Plugin::Registration<DoubleConvert> doubleconvert("doubleconvert");
}
#endif // LO_CLANG_SHARED_PLUGINS
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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