1 //== Yaml.h ---------------------------------------------------- -*- C++ -*--=// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines convenience functions for handling YAML configuration files 10 // for checkers/packages. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CLANG_LIB_STATICANALYZER_CHECKER_YAML_H 15 #define LLVM_CLANG_LIB_STATICANALYZER_CHECKER_YAML_H 16 17 #include "clang/StaticAnalyzer/Core/CheckerManager.h" 18 #include "llvm/Support/VirtualFileSystem.h" 19 #include "llvm/Support/YAMLTraits.h" 20 #include <optional> 21 22 namespace clang { 23 namespace ento { 24 25 /// Read the given file from the filesystem and parse it as a yaml file. The 26 /// template parameter must have a yaml MappingTraits. 27 /// Emit diagnostic error in case of any failure. 28 template <class T, class Checker> 29 std::optional<T> getConfiguration(CheckerManager &Mgr, Checker *Chk, 30 StringRef Option, StringRef ConfigFile) { 31 if (ConfigFile.trim().empty()) 32 return std::nullopt; 33 34 llvm::vfs::FileSystem *FS = llvm::vfs::getRealFileSystem().get(); 35 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer = 36 FS->getBufferForFile(ConfigFile.str()); 37 38 if (std::error_code ec = Buffer.getError()) { 39 Mgr.reportInvalidCheckerOptionValue(Chk, Option, 40 "a valid filename instead of '" + 41 std::string(ConfigFile) + "'"); 42 return std::nullopt; 43 } 44 45 llvm::yaml::Input Input(Buffer.get()->getBuffer()); 46 T Config; 47 Input >> Config; 48 49 if (std::error_code ec = Input.error()) { 50 Mgr.reportInvalidCheckerOptionValue(Chk, Option, 51 "a valid yaml file: " + ec.message()); 52 return std::nullopt; 53 } 54 55 return Config; 56 } 57 58 } // namespace ento 59 } // namespace clang 60 61 #endif // LLVM_CLANG_LIB_STATICANALYZER_CHECKER_YAML_H 62