1 files changed, 59 insertions, 0 deletions
diff --git a/clang/lib/StaticAnalyzer/Checkers/Yaml.h b/clang/lib/StaticAnalyzer/Checkers/Yaml.h
new file mode 100755
index 000000000000..968c50e33f6d
--- /dev/null
+++ b/clang/lib/StaticAnalyzer/Checkers/Yaml.h
@@ -0,0 +1,59 @@
+//== Yaml.h ---------------------------------------------------- -*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines convenience functions for handling YAML configuration files
+// for checkers/packages.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_STATICANALYZER_CHECKER_YAML_H
+#define LLVM_CLANG_LIB_STATICANALYZER_CHECKER_YAML_H
+
+#include "clang/StaticAnalyzer/Core/CheckerManager.h"
+#include "llvm/Support/YAMLTraits.h"
+
+namespace clang {
+namespace ento {
+
+/// Read the given file from the filesystem and parse it as a yaml file. The
+/// template parameter must have a yaml MappingTraits.
+/// Emit diagnostic error in case of any failure.
+template <class T, class Checker>
+llvm::Optional<T> getConfiguration(CheckerManager &Mgr, Checker *Chk,
+                                   StringRef Option, StringRef ConfigFile) {
+  if (ConfigFile.trim().empty())
+    return None;
+
+  llvm::vfs::FileSystem *FS = llvm::vfs::getRealFileSystem().get();
+  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
+      FS->getBufferForFile(ConfigFile.str());
+
+  if (std::error_code ec = Buffer.getError()) {
+    Mgr.reportInvalidCheckerOptionValue(Chk, Option,
+                                        "a valid filename instead of '" +
+                                            std::string(ConfigFile) + "'");
+    return None;
+  }
+
+  llvm::yaml::Input Input(Buffer.get()->getBuffer());
+  T Config;
+  Input >> Config;
+
+  if (std::error_code ec = Input.error()) {
+    Mgr.reportInvalidCheckerOptionValue(Chk, Option,
+                                        "a valid yaml file: " + ec.message());
+    return None;
+  }
+
+  return Config;
+}
+
+} // namespace ento
+} // namespace clang
+
+#endif // LLVM_CLANG_LIB_STATICANALYZER_CHECKERS_MOVE_H