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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 {
namespace tidy {
namespace bugprone {
/// Checker for signal handler functions.
///
/// For the user-facing documentation see:
/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone/signal-handler-check.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).
/// @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.
/// @return Returns true if a diagnostic was emitted for this function.
bool checkFunction(const FunctionDecl *FD, const Expr *CallOrRef);
/// Returns true if a standard library function is considered as
/// 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.
void reportHandlerChain(const llvm::df_iterator<clang::CallGraphNode *> &Itr,
const DeclRefExpr *HandlerRef);
clang::CallGraph CG;
AsyncSafeFunctionSetKind AsyncSafeFunctionSet;
const llvm::StringSet<> ConformingFunctions;
};
} // namespace bugprone
} // namespace tidy
} // namespace clang
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SIGNALHANDLERCHECK_H
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