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

   1 //===--- AvoidCapturingLambdaCoroutinesCheck.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 "AvoidCapturingLambdaCoroutinesCheck.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 namespace {
  18 AST_MATCHER(LambdaExpr, hasCoroutineBody) {
  19   const Stmt *Body = Node.getBody();
  20   return Body != nullptr && CoroutineBodyStmt::classof(Body);
  21 }
  22
  23 AST_MATCHER(LambdaExpr, hasCaptures) { return Node.capture_size() != 0U; }
  24 } // namespace
  25
  26 void AvoidCapturingLambdaCoroutinesCheck::registerMatchers(
  27     MatchFinder *Finder) {
  28   Finder->addMatcher(
  29       lambdaExpr(hasCaptures(), hasCoroutineBody()).bind("lambda"), this);
  30 }
  31
  32 bool AvoidCapturingLambdaCoroutinesCheck::isLanguageVersionSupported(
  33     const LangOptions &LangOpts) const {
  34   return LangOpts.CPlusPlus20;
  35 }
  36
  37 void AvoidCapturingLambdaCoroutinesCheck::check(
  38     const MatchFinder::MatchResult &Result) {
  39   const auto *MatchedLambda = Result.Nodes.getNodeAs<LambdaExpr>("lambda");
  40   diag(MatchedLambda->getExprLoc(),
  41        "coroutine lambda may cause use-after-free, avoid captures or ensure "
  42        "lambda closure object has guaranteed lifetime");
  43 }
  44
  45 } // namespace clang::tidy::cppcoreguidelines