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//===--- UnusedRAIICheck.h - clang-tidy -------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSEDRAIICHECK_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSEDRAIICHECK_H
#include "../ClangTidy.h"
namespace clang {
namespace tidy {
namespace misc {
/// Finds temporaries that look like RAII objects.
///
/// The canonical example for this is a scoped lock.
///
/// \code
/// {
/// scoped_lock(&global_mutex);
/// critical_section();
/// }
/// \endcode
///
/// The destructor of the scoped_lock is called before the `critical_section` is
/// entered, leaving it unprotected.
///
/// We apply a number of heuristics to reduce the false positive count of this
/// check:
///
/// * Ignore code expanded from macros. Testing frameworks make heavy use of
/// this.
/// * Ignore types with no user-declared constructor. Those are very unlikely
/// to be RAII objects.
/// * Ignore objects at the end of a compound statement (doesn't change
/// behavior).
/// * Ignore objects returned from a call.
class UnusedRAIICheck : public ClangTidyCheck {
public:
UnusedRAIICheck(StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context) {}
void registerMatchers(ast_matchers::MatchFinder *Finder) override;
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
};
} // namespace misc
} // namespace tidy
} // namespace clang
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSEDRAIICHECK_H
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