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//===--- UnusedParametersCheck.cpp - clang-tidy----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "UnusedParametersCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
void UnusedParametersCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
parmVarDecl(hasAncestor(functionDecl().bind("function"))).bind("x"),
this);
}
void UnusedParametersCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Function = Result.Nodes.getNodeAs<FunctionDecl>("function");
if (!Function->doesThisDeclarationHaveABody())
return;
const auto *Param = Result.Nodes.getNodeAs<ParmVarDecl>("x");
if (Param->isUsed())
return;
auto MyDiag = diag(Param->getLocation(), "parameter '%0' is unused")
<< Param->getName();
SourceRange RemovalRange(Param->getLocation(), Param->getLocEnd());
MyDiag << FixItHint::CreateReplacement(
RemovalRange, (Twine(" /*") + Param->getName() + "*/").str());
}
} // namespace tidy
} // namespace clang
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