BitstreamRemarkParser.h

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//===-- BitstreamRemarkParser.h - Parser for Bitstream remarks --*- 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 provides the impementation of the Bitstream remark parser.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_REMARKS_BITSTREAM_REMARK_PARSER_H
#define LLVM_LIB_REMARKS_BITSTREAM_REMARK_PARSER_H
 
#include "llvm/Remarks/BitstreamRemarkContainer.h"
#include "llvm/Remarks/BitstreamRemarkParser.h"
#include "llvm/Remarks/RemarkFormat.h"
#include "llvm/Remarks/RemarkParser.h"
#include <cstdint>
#include <memory>
#include <optional>
 
namespace llvm {
namespace remarks {
 
struct Remark;
 
/// Parses and holds the state of the latest parsed remark.
struct BitstreamRemarkParser : public RemarkParser {
  /// The buffer to parse.
  BitstreamParserHelper ParserHelper;
  /// The string table used for parsing strings.
  std::optional<ParsedStringTable> StrTab;
  /// Temporary remark buffer used when the remarks are stored separately.
  std::unique_ptr<MemoryBuffer> TmpRemarkBuffer;
  /// The common metadata used to decide how to parse the buffer.
  /// This is filled when parsing the metadata block.
  uint64_t ContainerVersion = 0;
  uint64_t RemarkVersion = 0;
  BitstreamRemarkContainerType ContainerType =
      BitstreamRemarkContainerType::Standalone;
  /// Wether the parser is ready to parse remarks.
  bool ReadyToParseRemarks = false;
 
  /// Create a parser that expects to find a string table embedded in the
  /// stream.
  explicit BitstreamRemarkParser(StringRef Buf);
 
  Expected<std::unique_ptr<Remark>> next() override;
 
  static bool classof(const RemarkParser *P) {
    return P->ParserFormat == Format::Bitstream;
  }
 
  /// Parse and process the metadata of the buffer.
  Error parseMeta();
 
  /// Parse a Bitstream remark.
  Expected<std::unique_ptr<Remark>> parseRemark();
 
private:
  /// Helper functions.
  Error processCommonMeta(BitstreamMetaParserHelper &Helper);
  Error processStandaloneMeta(BitstreamMetaParserHelper &Helper);
  Error processSeparateRemarksFileMeta(BitstreamMetaParserHelper &Helper);
  Error processSeparateRemarksMetaMeta(BitstreamMetaParserHelper &Helper);
  Expected<std::unique_ptr<Remark>>
  processRemark(BitstreamRemarkParserHelper &Helper);
  Error processExternalFilePath(std::optional<StringRef> ExternalFilePath);
};
 
Expected<std::unique_ptr<BitstreamRemarkParser>> createBitstreamParserFromMeta(
    StringRef Buf,
    std::optional<StringRef> ExternalFilePrependPath = std::nullopt);
 
} // end namespace remarks
} // end namespace llvm
 
#endif /* LLVM_LIB_REMARKS_BITSTREAM_REMARK_PARSER_H */