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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 call a method with values == the values specified in the parameter defaults.
// i.e. where the code might as well not specify anything.
namespace {
class DefaultParams:
public RecursiveASTVisitor<DefaultParams>, public loplugin::Plugin
{
public:
explicit DefaultParams(InstantiationData const & data): Plugin(data) {}
virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
bool VisitCallExpr(const CallExpr * callExpr);
};
bool DefaultParams::VisitCallExpr(const CallExpr * callExpr) {
if (ignoreLocation(callExpr)) {
return true;
}
if (callExpr->getNumArgs() == 0) {
return true;
}
if (callExpr->getDirectCallee() == nullptr) {
return true;
}
const FunctionDecl* functionDecl = callExpr->getDirectCallee()->getCanonicalDecl();
unsigned i = callExpr->getNumArgs() - 1;
const Expr* arg = callExpr->getArg(i);
// variadic functions
if (i >= functionDecl->getNumParams()) {
return true;
}
const ParmVarDecl* parmVarDecl = functionDecl->getParamDecl(i);
const Expr* defaultArgExpr = parmVarDecl->getDefaultArg();
if (!arg->isDefaultArgument() &&
arg->isIntegerConstantExpr(compiler.getASTContext()) &&
parmVarDecl->hasDefaultArg() &&
!parmVarDecl->hasUninstantiatedDefaultArg() &&
defaultArgExpr->isIntegerConstantExpr(compiler.getASTContext()))
{
APSInt x1, x2;
if (arg->EvaluateAsInt(x1, compiler.getASTContext()) &&
defaultArgExpr->EvaluateAsInt(x2, compiler.getASTContext()) &&
x1 == x2)
{
report(
DiagnosticsEngine::Warning,
"not necessary to pass this argument, it defaults to the same value",
arg->getSourceRange().getBegin())
<< arg->getSourceRange();
report(
DiagnosticsEngine::Warning,
"default method parameter declaration here",
parmVarDecl->getSourceRange().getBegin())
<< parmVarDecl->getSourceRange();
}
}
return true;
}
loplugin::Plugin::Registration< DefaultParams > X("defaultparams", false);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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