| 1 | //===--- UnhandledExceptionAtNewCheck.cpp - clang-tidy --------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "UnhandledExceptionAtNewCheck.h" |
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| 10 | #include "clang/AST/ASTContext.h" |
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| 11 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
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| 12 | |
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| 13 | using namespace clang::ast_matchers; |
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| 14 | |
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| 15 | namespace clang::tidy::bugprone { |
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| 16 | |
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| 17 | AST_MATCHER_P(CXXTryStmt, hasHandlerFor, |
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| 18 | ast_matchers::internal::Matcher<QualType>, InnerMatcher) { |
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| 19 | for (unsigned NH = Node.getNumHandlers(), I = 0; I < NH; ++I) { |
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| 20 | const CXXCatchStmt *CatchS = Node.getHandler(i: I); |
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| 21 | // Check for generic catch handler (match anything). |
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| 22 | if (CatchS->getCaughtType().isNull()) |
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| 23 | return true; |
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| 24 | ast_matchers::internal::BoundNodesTreeBuilder Result(*Builder); |
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| 25 | if (InnerMatcher.matches(Node: CatchS->getCaughtType(), Finder, Builder: &Result)) { |
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| 26 | *Builder = std::move(Result); |
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| 27 | return true; |
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| 28 | } |
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| 29 | } |
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| 30 | return false; |
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| 31 | } |
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| 32 | |
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| 33 | AST_MATCHER(CXXNewExpr, mayThrow) { |
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| 34 | FunctionDecl *OperatorNew = Node.getOperatorNew(); |
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| 35 | if (!OperatorNew) |
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| 36 | return false; |
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| 37 | return !OperatorNew->getType()->castAs<FunctionProtoType>()->isNothrow(); |
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| 38 | } |
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| 39 | |
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| 40 | UnhandledExceptionAtNewCheck::UnhandledExceptionAtNewCheck( |
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| 41 | StringRef Name, ClangTidyContext *Context) |
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| 42 | : ClangTidyCheck(Name, Context) {} |
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| 43 | |
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| 44 | void UnhandledExceptionAtNewCheck::registerMatchers(MatchFinder *Finder) { |
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| 45 | auto BadAllocType = |
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| 46 | recordType(hasDeclaration(InnerMatcher: cxxRecordDecl(hasName(Name: "::std::bad_alloc" )))); |
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| 47 | auto ExceptionType = |
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| 48 | recordType(hasDeclaration(InnerMatcher: cxxRecordDecl(hasName(Name: "::std::exception" )))); |
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| 49 | auto BadAllocReferenceType = referenceType(pointee(BadAllocType)); |
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| 50 | auto ExceptionReferenceType = referenceType(pointee(ExceptionType)); |
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| 51 | |
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| 52 | auto CatchBadAllocType = |
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| 53 | qualType(hasCanonicalType(InnerMatcher: anyOf(BadAllocType, BadAllocReferenceType, |
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| 54 | ExceptionType, ExceptionReferenceType))); |
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| 55 | auto BadAllocCatchingTryBlock = cxxTryStmt(hasHandlerFor(InnerMatcher: CatchBadAllocType)); |
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| 56 | |
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| 57 | auto FunctionMayNotThrow = functionDecl(isNoThrow()); |
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| 58 | |
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| 59 | Finder->addMatcher(NodeMatch: cxxNewExpr(mayThrow(), |
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| 60 | unless(hasAncestor(BadAllocCatchingTryBlock)), |
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| 61 | hasAncestor(FunctionMayNotThrow)) |
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| 62 | .bind(ID: "new-expr" ), |
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| 63 | Action: this); |
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| 64 | } |
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| 65 | |
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| 66 | void UnhandledExceptionAtNewCheck::check( |
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| 67 | const MatchFinder::MatchResult &Result) { |
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| 68 | const auto *MatchedExpr = Result.Nodes.getNodeAs<CXXNewExpr>(ID: "new-expr" ); |
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| 69 | if (MatchedExpr) |
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| 70 | diag(Loc: MatchedExpr->getBeginLoc(), |
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| 71 | Description: "missing exception handler for allocation failure at 'new'" ); |
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| 72 | } |
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| 73 | |
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| 74 | } // namespace clang::tidy::bugprone |
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| 75 | |
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