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//===--- CloexecCheck.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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file contains the declaration of the CloexecCheck class, which is the
/// base class for all of the close-on-exec checks in Android module.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ANDROID_CLOEXEC_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ANDROID_CLOEXEC_H
#include "../ClangTidyCheck.h"
namespace clang {
namespace tidy {
namespace android {
/// The base class for all close-on-exec checks in Android module.
/// To be specific, there are some functions that need the close-on-exec flag to
/// prevent the file descriptor leakage on fork+exec and this class provides
/// utilities to identify and fix these C functions.
class CloexecCheck : public ClangTidyCheck {
public:
CloexecCheck(StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context) {}
protected:
void
registerMatchersImpl(ast_matchers::MatchFinder *Finder,
ast_matchers::internal::Matcher<FunctionDecl> Function);
/// Currently, we have three types of fixes.
///
/// Type1 is to insert the necessary macro flag in the flag argument. For
/// example, 'O_CLOEXEC' is required in function 'open()', so
/// \code
/// open(file, O_RDONLY);
/// \endcode
/// should be
/// \code
/// open(file, O_RDONLY | O_CLOEXE);
/// \endcode
///
/// \param [out] Result MatchResult from AST matcher.
/// \param MacroFlag The macro name of the flag.
/// \param ArgPos The 0-based position of the flag argument.
void insertMacroFlag(const ast_matchers::MatchFinder::MatchResult &Result,
StringRef MacroFlag, int ArgPos);
/// Type2 is to replace the API to another function that has required the
/// ability. For example:
/// \code
/// creat(path, mode);
/// \endcode
/// should be
/// \code
/// open(path, O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC, mode)
/// \endcode
///
/// \param [out] Result MatchResult from AST matcher.
/// \param WarningMsg The warning message.
/// \param FixMsg The fix message.
void replaceFunc(const ast_matchers::MatchFinder::MatchResult &Result,
StringRef WarningMsg, StringRef FixMsg);
/// Type3 is also to add a flag to the corresponding argument, but this time,
/// the flag is some string and each char represents a mode rather than a
/// macro. For example, 'fopen' needs char 'e' in its mode argument string, so
/// \code
/// fopen(in_file, "r");
/// \endcode
/// should be
/// \code
/// fopen(in_file, "re");
/// \endcode
///
/// \param [out] Result MatchResult from AST matcher.
/// \param Mode The required mode char.
/// \param ArgPos The 0-based position of the flag argument.
void insertStringFlag(const ast_matchers::MatchFinder::MatchResult &Result,
const char Mode, const int ArgPos);
/// Helper function to get the spelling of a particular argument.
StringRef getSpellingArg(const ast_matchers::MatchFinder::MatchResult &Result,
int N) const;
/// Binding name of the FuncDecl of a function call.
static const char *FuncDeclBindingStr;
/// Binding name of the function call expression.
static const char *FuncBindingStr;
};
} // namespace android
} // namespace tidy
} // namespace clang
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ANDROID_CLOEXEC_H
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