clang-tools-extra/clang-tidy/cppcoreguidelines/AvoidReferenceCoroutineParametersCheck.cpp

   1 //===--- AvoidReferenceCoroutineParametersCheck.cpp - clang-tidy ----------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "AvoidReferenceCoroutineParametersCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/ASTMatchers/ASTMatchFinder.h"
  12
  13 using namespace clang::ast_matchers;
  14
  15 namespace clang::tidy::cppcoreguidelines {
  16
  17 void AvoidReferenceCoroutineParametersCheck::registerMatchers(
  18     MatchFinder *Finder) {
  19   auto IsCoroMatcher =
  20       hasDescendant(expr(anyOf(coyieldExpr(), coreturnStmt(), coawaitExpr())));
  21   Finder->addMatcher(parmVarDecl(hasType(type(referenceType())),
  22                                  hasAncestor(functionDecl(IsCoroMatcher)))
  23                          .bind("param"),
  24                      this);
  25 }
  26
  27 void AvoidReferenceCoroutineParametersCheck::check(
  28     const MatchFinder::MatchResult &Result) {
  29   if (const auto *Param = Result.Nodes.getNodeAs<ParmVarDecl>("param")) {
  30     diag(Param->getBeginLoc(), "coroutine parameters should not be references");
  31   }
  32 }
  33
  34 } // namespace clang::tidy::cppcoreguidelines