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 
registerMatchers(MatchFinder * Finder)17 void AvoidReferenceCoroutineParametersCheck::registerMatchers(
18     MatchFinder *Finder) {
19   Finder->addMatcher(
20       functionDecl(unless(parameterCountIs(0)), hasBody(coroutineBodyStmt()))
21           .bind("fnt"),
22       this);
23 }
24 
check(const MatchFinder::MatchResult & Result)25 void AvoidReferenceCoroutineParametersCheck::check(
26     const MatchFinder::MatchResult &Result) {
27   const auto *Function = Result.Nodes.getNodeAs<FunctionDecl>("fnt");
28   for (const ParmVarDecl *Param : Function->parameters()) {
29     if (!Param->getType().getCanonicalType()->isReferenceType())
30       continue;
31 
32     diag(Param->getBeginLoc(), "coroutine parameters should not be references");
33   }
34 }
35 
36 } // namespace clang::tidy::cppcoreguidelines
37