| //===--- ReturnConstRefFromParameterCheck.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 "ReturnConstRefFromParameterCheck.h" |
| #include "../utils/Matchers.h" |
| #include "clang/ASTMatchers/ASTMatchFinder.h" |
| #include "clang/ASTMatchers/ASTMatchers.h" |
| |
| using namespace clang::ast_matchers; |
| |
| namespace clang::tidy::bugprone { |
| |
| void ReturnConstRefFromParameterCheck::registerMatchers(MatchFinder *Finder) { |
| Finder->addMatcher( |
| returnStmt( |
| hasReturnValue(declRefExpr(to(parmVarDecl(hasType(hasCanonicalType( |
| qualType(matchers::isReferenceToConst()).bind("type"))))))), |
| hasAncestor(functionDecl(hasReturnTypeLoc( |
| loc(qualType(hasCanonicalType(equalsBoundNode("type")))))))) |
| .bind("ret"), |
| this); |
| } |
| |
| void ReturnConstRefFromParameterCheck::check( |
| const MatchFinder::MatchResult &Result) { |
| const auto *R = Result.Nodes.getNodeAs<ReturnStmt>("ret"); |
| const SourceRange Range = R->getRetValue()->getSourceRange(); |
| if (Range.isInvalid()) |
| return; |
| diag(Range.getBegin(), |
| "returning a constant reference parameter may cause use-after-free " |
| "when the parameter is constructed from a temporary") |
| << Range; |
| } |
| |
| } // namespace clang::tidy::bugprone |
