//===--- AvoidReferenceCoroutineParametersCheck.cpp - clang-tidy ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "AvoidReferenceCoroutineParametersCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"

using namespace clang::ast_matchers;

namespace clang::tidy::cppcoreguidelines {

void AvoidReferenceCoroutineParametersCheck::registerMatchers(
    MatchFinder *Finder) {
  Finder->addMatcher(
      functionDecl(unless(parameterCountIs(0)), hasBody(coroutineBodyStmt()))
          .bind("fnt"),
      this);
}

void AvoidReferenceCoroutineParametersCheck::check(
    const MatchFinder::MatchResult &Result) {
  const auto *Function = Result.Nodes.getNodeAs<FunctionDecl>("fnt");
  for (const ParmVarDecl *Param : Function->parameters()) {
    if (!Param->getType().getCanonicalType()->isReferenceType())
      continue;

    diag(Param->getBeginLoc(), "coroutine parameters should not be references");
  }
}

} // namespace clang::tidy::cppcoreguidelines
