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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 for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This file provides the impementation of the Bitstream remark parser.
#include "llvm/ADT/Optional.h"
#include "llvm/Remarks/BitstreamRemarkContainer.h"
#include "llvm/Remarks/BitstreamRemarkParser.h"
#include "llvm/Remarks/Remark.h"
#include "llvm/Remarks/RemarkFormat.h"
#include "llvm/Remarks/RemarkParser.h"
#include <cstdint>
#include <memory>
namespace llvm {
namespace remarks {
/// 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.
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 =
/// 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)
: RemarkParser(Format::Bitstream), ParserHelper(Buf) {}
/// Create a parser that uses a pre-parsed string table.
BitstreamRemarkParser(StringRef Buf, ParsedStringTable StrTab)
: RemarkParser(Format::Bitstream), ParserHelper(Buf),
StrTab(std::move(StrTab)) {}
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();
/// Helper functions.
Error processCommonMeta(BitstreamMetaParserHelper &Helper);
Error processStandaloneMeta(BitstreamMetaParserHelper &Helper);
Error processSeparateRemarksFileMeta(BitstreamMetaParserHelper &Helper);
Error processSeparateRemarksMetaMeta(BitstreamMetaParserHelper &Helper);
processRemark(BitstreamRemarkParserHelper &Helper);
Error processExternalFilePath(Optional<StringRef> ExternalFilePath);
Expected<std::unique_ptr<BitstreamRemarkParser>> createBitstreamParserFromMeta(
StringRef Buf, Optional<ParsedStringTable> StrTab = None,
Optional<StringRef> ExternalFilePrependPath = None);
} // end namespace remarks
} // end namespace llvm