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//===--- ThrowByValueCatchByReferenceCheck.h - clang-tidy--------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "../ClangTidyCheck.h"
namespace clang {
namespace tidy {
namespace misc {
///checks for locations that do not throw by value
// or catch by reference.
// The check is C++ only. It checks that all throw locations
// throw by value and not by pointer. Additionally it
// contains an option ("CheckThrowTemporaries", default value "true") that
// checks that thrown objects are anonymous temporaries. It is also
// acceptable for this check to throw string literals.
// This test checks that exceptions are caught by reference
// and not by value or pointer. It will not warn when catching
// pointer to char, wchar_t, char16_t or char32_t. This is
// due to not warning on throwing string literals.
class ThrowByValueCatchByReferenceCheck : public ClangTidyCheck {
ThrowByValueCatchByReferenceCheck(StringRef Name, ClangTidyContext *Context);
bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
return LangOpts.CPlusPlus;
void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
void registerMatchers(ast_matchers::MatchFinder *Finder) override;
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
void diagnoseThrowLocations(const CXXThrowExpr *throwExpr);
void diagnoseCatchLocations(const CXXCatchStmt *catchStmt,
ASTContext &context);
bool isFunctionParameter(const DeclRefExpr *declRefExpr);
bool isCatchVariable(const DeclRefExpr *declRefExpr);
bool isFunctionOrCatchVar(const DeclRefExpr *declRefExpr);
const bool CheckAnonymousTemporaries;
const bool WarnOnLargeObject;
const uint64_t MaxSizeOptions; // The raw value read from the options.
uint64_t MaxSize; // No `const` because we have to set it in two steps.
} // namespace misc
} // namespace tidy
} // namespace clang