Merge "Update prebuilt Clang to r353983." into p9.0HEADp9.0-backupp9.0

1 files changed, 138 insertions, 0 deletions

diff --git a/clang-r353983/include/clang/Frontend/SerializedDiagnosticReader.h b/clang-r353983/include/clang/Frontend/SerializedDiagnosticReader.h
new file mode 100644
index 00000000..7b3a6dba
--- /dev/null
+++ b/clang-r353983/include/clang/Frontend/SerializedDiagnosticReader.h
@@ -0,0 +1,138 @@
+//===- SerializedDiagnosticReader.h - Reads diagnostics ---------*- 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_FRONTEND_SERIALIZEDDIAGNOSTICREADER_H
+#define LLVM_CLANG_FRONTEND_SERIALIZEDDIAGNOSTICREADER_H
+
+#include "clang/Basic/LLVM.h"
+#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/ErrorOr.h"
+#include <system_error>
+
+namespace clang {
+namespace serialized_diags {
+
+enum class SDError {
+  CouldNotLoad = 1,
+  InvalidSignature,
+  InvalidDiagnostics,
+  MalformedTopLevelBlock,
+  MalformedSubBlock,
+  MalformedBlockInfoBlock,
+  MalformedMetadataBlock,
+  MalformedDiagnosticBlock,
+  MalformedDiagnosticRecord,
+  MissingVersion,
+  VersionMismatch,
+  UnsupportedConstruct,
+  /// A generic error for subclass handlers that don't want or need to define
+  /// their own error_category.
+  HandlerFailed
+};
+
+const std::error_category &SDErrorCategory();
+
+inline std::error_code make_error_code(SDError E) {
+  return std::error_code(static_cast<int>(E), SDErrorCategory());
+}
+
+/// A location that is represented in the serialized diagnostics.
+struct Location {
+  unsigned FileID;
+  unsigned Line;
+  unsigned Col;
+  unsigned Offset;
+
+  Location(unsigned FileID, unsigned Line, unsigned Col, unsigned Offset)
+      : FileID(FileID), Line(Line), Col(Col), Offset(Offset) {}
+};
+
+/// A base class that handles reading serialized diagnostics from a file.
+///
+/// Subclasses should override the visit* methods with their logic for handling
+/// the various constructs that are found in serialized diagnostics.
+class SerializedDiagnosticReader {
+public:
+  SerializedDiagnosticReader() = default;
+  virtual ~SerializedDiagnosticReader() = default;
+
+  /// Read the diagnostics in \c File
+  std::error_code readDiagnostics(StringRef File);
+
+private:
+  enum class Cursor;
+
+  /// Read to the next record or block to process.
+  llvm::ErrorOr<Cursor> skipUntilRecordOrBlock(llvm::BitstreamCursor &Stream,
+                                               unsigned &BlockOrRecordId);
+
+  /// Read a metadata block from \c Stream.
+  std::error_code readMetaBlock(llvm::BitstreamCursor &Stream);
+
+  /// Read a diagnostic block from \c Stream.
+  std::error_code readDiagnosticBlock(llvm::BitstreamCursor &Stream);
+
+protected:
+  /// Visit the start of a diagnostic block.
+  virtual std::error_code visitStartOfDiagnostic() { return {}; }
+
+  /// Visit the end of a diagnostic block.
+  virtual std::error_code visitEndOfDiagnostic() { return {}; }
+
+  /// Visit a category. This associates the category \c ID to a \c Name.
+  virtual std::error_code visitCategoryRecord(unsigned ID, StringRef Name) {
+    return {};
+  }
+
+  /// Visit a flag. This associates the flag's \c ID to a \c Name.
+  virtual std::error_code visitDiagFlagRecord(unsigned ID, StringRef Name) {
+    return {};
+  }
+
+  /// Visit a diagnostic.
+  virtual std::error_code
+  visitDiagnosticRecord(unsigned Severity, const Location &Location,
+                        unsigned Category, unsigned Flag, StringRef Message) {
+    return {};
+  }
+
+  /// Visit a filename. This associates the file's \c ID to a \c Name.
+  virtual std::error_code visitFilenameRecord(unsigned ID, unsigned Size,
+                                              unsigned Timestamp,
+                                              StringRef Name) {
+    return {};
+  }
+
+  /// Visit a fixit hint.
+  virtual std::error_code
+  visitFixitRecord(const Location &Start, const Location &End, StringRef Text) {
+    return {};
+  }
+
+  /// Visit a source range.
+  virtual std::error_code visitSourceRangeRecord(const Location &Start,
+                                                 const Location &End) {
+    return {};
+  }
+
+  /// Visit the version of the set of diagnostics.
+  virtual std::error_code visitVersionRecord(unsigned Version) { return {}; }
+};
+
+} // namespace serialized_diags
+} // namespace clang
+
+namespace std {
+
+template <>
+struct is_error_code_enum<clang::serialized_diags::SDError> : std::true_type {};
+
+} // namespace std
+
+#endif // LLVM_CLANG_FRONTEND_SERIALIZEDDIAGNOSTICREADER_H