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//===--- SignalHandlerCheck.h - clang-tidy ----------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SIGNALHANDLERCHECK_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SIGNALHANDLERCHECK_H
#include "../ClangTidyCheck.h"
#include "clang/Analysis/CallGraph.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/StringSet.h"
namespace clang::tidy::bugprone {
/// Checker for signal handler functions.
///
/// For the user-facing documentation see:
/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone/signal-handler.html
class SignalHandlerCheck : public ClangTidyCheck {
public:
enum class AsyncSafeFunctionSetKind { Minimal, POSIX };
SignalHandlerCheck(StringRef Name, ClangTidyContext *Context);
void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
bool isLanguageVersionSupported(const LangOptions &LangOpts) const override;
void registerMatchers(ast_matchers::MatchFinder *Finder) override;
void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
private:
/// Check if a function is allowed as a signal handler.
/// Should test the properties of the function, and check in the code body.
/// Should not check function calls in the code (this part is done by the call
/// graph scan).
/// Bug reports are generated for the whole code body (no stop at the first
/// found issue). For issues that are not in the code body, only one
/// bug report is generated.
/// \param FD The function to check. It may or may not have a definition.
/// \param CallOrRef Location of the call to this function (in another
/// function) or the reference to the function (if it is used as a registered
/// signal handler). This is the location where diagnostics are to be placed.
/// \param ChainReporter A function that adds bug report notes to display the
/// chain of called functions from signal handler registration to the current
/// function. This is called at every generated bug report.
/// The bool parameter is used like \c SkipPathEnd in \c reportHandlerChain .
/// \return Returns true if a diagnostic was emitted for this function.
bool checkFunction(const FunctionDecl *FD, const Expr *CallOrRef,
std::function<void(bool)> ChainReporter);
/// Similar as \c checkFunction but only check for C++14 rules.
bool checkFunctionCPP14(const FunctionDecl *FD, const Expr *CallOrRef,
std::function<void(bool)> ChainReporter);
/// Returns true if a standard library function is considered
/// asynchronous-safe.
bool isStandardFunctionAsyncSafe(const FunctionDecl *FD) const;
/// Add diagnostic notes to show the call chain of functions from a signal
/// handler to a function that is called (directly or indirectly) from it.
/// Also add a note to the place where the signal handler is registered.
/// @param Itr Position during a call graph depth-first iteration. It contains
/// the "path" (call chain) from the signal handler to the actual found
/// function call.
/// @param HandlerRef Reference to the signal handler function where it is
/// registered as signal handler.
/// @param SkipPathEnd If true the last item of the call chain (farthest away
/// from the \c signal call) is omitted from note generation.
void reportHandlerChain(const llvm::df_iterator<clang::CallGraphNode *> &Itr,
const DeclRefExpr *HandlerRef, bool SkipPathEnd);
clang::CallGraph CG;
AsyncSafeFunctionSetKind AsyncSafeFunctionSet;
llvm::StringSet<> ConformingFunctions;
};
} // namespace clang::tidy::bugprone
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SIGNALHANDLERCHECK_H
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