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//===--- AvoidCapturingLambdaCoroutinesCheck.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 "AvoidCapturingLambdaCoroutinesCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang::tidy::cppcoreguidelines {
namespace {
AST_MATCHER(LambdaExpr, hasCoroutineBody) {
const Stmt *Body = Node.getBody();
return Body != nullptr && CoroutineBodyStmt::classof(Body);
}
AST_MATCHER(LambdaExpr, hasCaptures) { return Node.capture_size() != 0U; }
} // namespace
void AvoidCapturingLambdaCoroutinesCheck::registerMatchers(
MatchFinder *Finder) {
Finder->addMatcher(
lambdaExpr(hasCaptures(), hasCoroutineBody()).bind("lambda"), this);
}
bool AvoidCapturingLambdaCoroutinesCheck::isLanguageVersionSupported(
const LangOptions &LangOpts) const {
return LangOpts.CPlusPlus20;
}
void AvoidCapturingLambdaCoroutinesCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *MatchedLambda = Result.Nodes.getNodeAs<LambdaExpr>("lambda");
diag(MatchedLambda->getExprLoc(),
"coroutine lambda may cause use-after-free, avoid captures or ensure "
"lambda closure object has guaranteed lifetime");
}
} // namespace clang::tidy::cppcoreguidelines
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