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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 "check.hxx"
#include "plugin.hxx"
/** Look for static O*String and O*String[] which can be constepxr.
*/
namespace {
class StringStatic
: public loplugin::FilteringPlugin<StringStatic>
{
public:
explicit StringStatic(loplugin::InstantiationData const& rData):
FilteringPlugin(rData) {}
void run() override;
bool VisitVarDecl(VarDecl const*);
};
void StringStatic::run()
{
if( preRun())
if( TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()))
postRun();
}
bool StringStatic::VisitVarDecl(VarDecl const* varDecl)
{
if (ignoreLocation(varDecl))
return true;
QualType qt = varDecl->getType();
if (!varDecl->isThisDeclarationADefinition()
|| !qt.isConstQualified() || varDecl->isConstexpr())
return true;
if (varDecl->hasGlobalStorage())
{
if (qt->isArrayType())
qt = qt->getAsArrayTypeUnsafe()->getElementType();
auto tc = loplugin::TypeCheck(qt);
if (!tc.Class("OUString").Namespace("rtl").GlobalNamespace()
&& !tc.Class("OString").Namespace("rtl").GlobalNamespace())
return true;
if (varDecl->hasInit())
{
Expr const * expr = varDecl->getInit();
while (true) {
if (ExprWithCleanups const * exprWithCleanups = dyn_cast<ExprWithCleanups>(expr)) {
expr = exprWithCleanups->getSubExpr();
}
else if (CastExpr const * castExpr = dyn_cast<CastExpr>(expr)) {
expr = castExpr->getSubExpr();
}
else if (MaterializeTemporaryExpr const * materializeExpr = dyn_cast<MaterializeTemporaryExpr>(expr)) {
expr = materializeExpr->getSubExpr();
}
else if (CXXBindTemporaryExpr const * bindExpr = dyn_cast<CXXBindTemporaryExpr>(expr)) {
expr = bindExpr->getSubExpr();
}
else if (CXXConstructExpr const * constructExpr = dyn_cast<CXXConstructExpr>(expr)) {
if (constructExpr->getNumArgs() == 0) {
return true;
}
expr = constructExpr->getArg(0);
} else if (isa<CallExpr>(expr)) {
return true;
} else {
break;
}
}
}
}
else
{
if (isa<ParmVarDecl>(varDecl))
return true;
loplugin::TypeCheck const tc(varDecl->getType());
if (!(tc.Class("OString").Namespace("rtl").GlobalNamespace()
|| tc.Class("OUString").Namespace("rtl").GlobalNamespace()))
{
return true;
}
if (varDecl->hasInit())
{
auto cxxConstruct = dyn_cast<CXXConstructExpr>(varDecl->getInit()->IgnoreImplicit());
if (!cxxConstruct || cxxConstruct->getNumArgs() == 0)
return true;
if (!isa<clang::StringLiteral>(cxxConstruct->getArg(0)))
return true;
}
}
// cannot make something constexpr if it is also declared in a header file as extern
if (loplugin::hasExternalLinkage(varDecl))
return true;
report(DiagnosticsEngine::Warning,
"rather declare this as constexpr",
varDecl->getLocation())
<< varDecl->getSourceRange();
return true;
}
loplugin::Plugin::Registration<StringStatic> stringstatic("stringstatic");
} // namespace
#endif // LO_CLANG_SHARED_PLUGINS
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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