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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 <unordered_map>
#include <unordered_set>
#include "plugin.hxx"
#include "check.hxx"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/StmtVisitor.h"
/**
Look for places where we are making a substring copy of an OUString, and then passing it to a
function that takes a u16string_view, in which case it is more efficient to pass a view
of the OUString, rather than making a copy.
TODO currently does not check if there is some other visible overload of the callee, that can take
a string_view.
TODO handle OUStringBuffer/OStringBuffer similarly
*/
namespace
{
class StringView : public loplugin::FilteringPlugin<StringView>
{
public:
explicit StringView(loplugin::InstantiationData const& data)
: FilteringPlugin(data)
{
}
bool preRun() override { return true; }
virtual void run() override
{
if (!preRun())
return;
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
}
bool VisitFunctionDecl(FunctionDecl const*);
bool VisitCXXOperatorCallExpr(CXXOperatorCallExpr const*);
bool VisitImplicitCastExpr(ImplicitCastExpr const*);
private:
void handleCXXConstructExpr(CXXConstructExpr const* expr);
void handleCXXMemberCallExpr(CXXMemberCallExpr const* expr);
};
bool StringView::VisitCXXOperatorCallExpr(CXXOperatorCallExpr const* cxxOperatorCallExpr)
{
if (ignoreLocation(cxxOperatorCallExpr))
return true;
auto check = [&](const Expr* expr) -> void {
auto memberCallExpr = dyn_cast<CXXMemberCallExpr>(compat::IgnoreImplicit(expr));
if (!memberCallExpr)
return;
auto methodDecl = memberCallExpr->getMethodDecl();
if (!methodDecl->getIdentifier() || methodDecl->getName() != "copy")
return;
report(DiagnosticsEngine::Warning, "rather than copy, pass with a view using subView()",
compat::getBeginLoc(expr))
<< expr->getSourceRange();
};
auto op = cxxOperatorCallExpr->getOperator();
if (op == OO_Plus && cxxOperatorCallExpr->getNumArgs() == 2)
{
check(cxxOperatorCallExpr->getArg(0));
check(cxxOperatorCallExpr->getArg(1));
}
if (compat::isComparisonOp(cxxOperatorCallExpr))
{
check(cxxOperatorCallExpr->getArg(0));
check(cxxOperatorCallExpr->getArg(1));
}
else if (op == OO_PlusEqual)
check(cxxOperatorCallExpr->getArg(1));
else if (op == OO_Subscript)
check(cxxOperatorCallExpr->getArg(0));
return true;
}
bool StringView::VisitFunctionDecl(FunctionDecl const* functionDecl)
{
if (ignoreLocation(functionDecl))
return true;
// debugging
// if (functionDecl->getIdentifier() && functionDecl->getName() == "f1")
// functionDecl->dump();
return true;
}
bool StringView::VisitImplicitCastExpr(ImplicitCastExpr const* expr)
{
if (ignoreLocation(expr))
{
return true;
}
if (!loplugin::TypeCheck(expr->getType()).ClassOrStruct("basic_string_view").StdNamespace())
{
return true;
}
auto const e = expr->getSubExprAsWritten()->IgnoreParens();
auto const tc = loplugin::TypeCheck(e->getType());
if (!(tc.Class("OString").Namespace("rtl").GlobalNamespace()
|| tc.Class("OUString").Namespace("rtl").GlobalNamespace()))
{
return true;
}
if (auto const e1 = dyn_cast<CXXConstructExpr>(e))
{
handleCXXConstructExpr(e1);
}
else if (auto const e2 = dyn_cast<CXXFunctionalCastExpr>(e))
{
auto e3 = e2->getSubExpr();
if (auto const e4 = dyn_cast<CXXBindTemporaryExpr>(e3))
{
e3 = e4->getSubExpr();
}
if (auto const e4 = dyn_cast<CXXConstructExpr>(e3))
{
handleCXXConstructExpr(e4);
}
}
else if (auto const e3 = dyn_cast<CXXMemberCallExpr>(e))
{
handleCXXMemberCallExpr(e3);
}
return true;
}
void StringView::handleCXXConstructExpr(CXXConstructExpr const* expr)
{
bool charArg = false;
auto const d = expr->getConstructor();
switch (d->getNumParams())
{
case 0:
break;
case 1:
{
auto const t = d->getParamDecl(0)->getType();
if (t->isAnyCharacterType())
{
charArg = true;
break;
}
loplugin::TypeCheck tc(t);
if (tc.LvalueReference()
.Const()
.Class("OStringLiteral")
.Namespace("rtl")
.GlobalNamespace()
|| tc.LvalueReference()
.Const()
.Class("OUStringLiteral")
.Namespace("rtl")
.GlobalNamespace()
|| tc.RvalueReference().Struct("OStringNumber").Namespace("rtl").GlobalNamespace()
|| tc.RvalueReference().Struct("OUStringNumber").Namespace("rtl").GlobalNamespace()
|| tc.ClassOrStruct("basic_string_view").StdNamespace())
{
break;
}
return;
}
case 2:
{
auto const t0 = d->getParamDecl(0)->getType();
if (t0->isPointerType() && t0->getPointeeType()->isAnyCharacterType())
{
auto const t = d->getParamDecl(1)->getType();
if (t->isIntegralType(compiler.getASTContext())
&& !(t->isBooleanType() || t->isAnyCharacterType()))
{
break;
}
}
if (loplugin::TypeCheck(d->getParamDecl(1)->getType())
.Struct("Dummy")
.Namespace("libreoffice_internal")
.Namespace("rtl")
.GlobalNamespace())
{
break;
}
return;
}
default:
return;
}
report(DiagnosticsEngine::Warning,
"instead of an %0, pass a '%select{std::string_view|std::u16string_view}1'"
"%select{| (or an '%select{rtl::OStringChar|rtl::OUStringChar}1')}2",
expr->getExprLoc())
<< expr->getType()
<< (loplugin::TypeCheck(expr->getType()).Class("OString").Namespace("rtl").GlobalNamespace()
? 0
: 1)
<< charArg << expr->getSourceRange();
}
void StringView::handleCXXMemberCallExpr(CXXMemberCallExpr const* expr)
{
auto const dc = loplugin::DeclCheck(expr->getMethodDecl()).Function("copy");
if (!dc)
{
return;
}
if (!(dc.Class("OString").Namespace("rtl").GlobalNamespace()
|| dc.Class("OUString").Namespace("rtl").GlobalNamespace()))
{
return;
}
report(DiagnosticsEngine::Warning, "rather than copy, pass with a view using subView()",
expr->getExprLoc())
<< expr->getSourceRange();
}
loplugin::Plugin::Registration<StringView> stringview("stringview");
}
#endif // LO_CLANG_SHARED_PLUGINS
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
