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4506afe3ca
When parsing bitstream remarks, allow external remark files to be empty, which means there are no remarks to be parsed. In the same way, dsymutil should not produce a remark file.
605 lines
21 KiB
C++
605 lines
21 KiB
C++
//===- BitstreamRemarkParser.cpp ------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides utility methods used by clients that want to use the
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// parser for remark diagnostics in LLVM.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Remarks/BitstreamRemarkParser.h"
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#include "BitstreamRemarkParser.h"
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#include "llvm/Remarks/BitstreamRemarkContainer.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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using namespace llvm;
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using namespace llvm::remarks;
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static Error unknownRecord(const char *BlockName, unsigned RecordID) {
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing %s: unknown record entry (%lu).", BlockName,
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RecordID);
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}
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static Error malformedRecord(const char *BlockName, const char *RecordName) {
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing %s: malformed record entry (%s).", BlockName,
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RecordName);
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}
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BitstreamMetaParserHelper::BitstreamMetaParserHelper(
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BitstreamCursor &Stream, BitstreamBlockInfo &BlockInfo)
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: Stream(Stream), BlockInfo(BlockInfo) {}
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/// Parse a record and fill in the fields in the parser.
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static Error parseRecord(BitstreamMetaParserHelper &Parser, unsigned Code) {
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BitstreamCursor &Stream = Parser.Stream;
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// Note: 2 is used here because it's the max number of fields we have per
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// record.
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SmallVector<uint64_t, 2> Record;
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StringRef Blob;
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Expected<unsigned> RecordID = Stream.readRecord(Code, Record, &Blob);
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if (!RecordID)
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return RecordID.takeError();
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switch (*RecordID) {
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case RECORD_META_CONTAINER_INFO: {
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if (Record.size() != 2)
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return malformedRecord("BLOCK_META", "RECORD_META_CONTAINER_INFO");
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Parser.ContainerVersion = Record[0];
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Parser.ContainerType = Record[1];
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break;
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}
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case RECORD_META_REMARK_VERSION: {
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if (Record.size() != 1)
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return malformedRecord("BLOCK_META", "RECORD_META_REMARK_VERSION");
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Parser.RemarkVersion = Record[0];
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break;
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}
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case RECORD_META_STRTAB: {
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if (Record.size() != 0)
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return malformedRecord("BLOCK_META", "RECORD_META_STRTAB");
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Parser.StrTabBuf = Blob;
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break;
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}
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case RECORD_META_EXTERNAL_FILE: {
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if (Record.size() != 0)
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return malformedRecord("BLOCK_META", "RECORD_META_EXTERNAL_FILE");
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Parser.ExternalFilePath = Blob;
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break;
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}
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default:
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return unknownRecord("BLOCK_META", *RecordID);
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}
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return Error::success();
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}
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BitstreamRemarkParserHelper::BitstreamRemarkParserHelper(
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BitstreamCursor &Stream)
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: Stream(Stream) {}
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/// Parse a record and fill in the fields in the parser.
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static Error parseRecord(BitstreamRemarkParserHelper &Parser, unsigned Code) {
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BitstreamCursor &Stream = Parser.Stream;
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// Note: 5 is used here because it's the max number of fields we have per
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// record.
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SmallVector<uint64_t, 5> Record;
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StringRef Blob;
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Expected<unsigned> RecordID = Stream.readRecord(Code, Record, &Blob);
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if (!RecordID)
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return RecordID.takeError();
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switch (*RecordID) {
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case RECORD_REMARK_HEADER: {
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if (Record.size() != 4)
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return malformedRecord("BLOCK_REMARK", "RECORD_REMARK_HEADER");
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Parser.Type = Record[0];
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Parser.RemarkNameIdx = Record[1];
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Parser.PassNameIdx = Record[2];
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Parser.FunctionNameIdx = Record[3];
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break;
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}
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case RECORD_REMARK_DEBUG_LOC: {
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if (Record.size() != 3)
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return malformedRecord("BLOCK_REMARK", "RECORD_REMARK_DEBUG_LOC");
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Parser.SourceFileNameIdx = Record[0];
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Parser.SourceLine = Record[1];
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Parser.SourceColumn = Record[2];
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break;
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}
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case RECORD_REMARK_HOTNESS: {
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if (Record.size() != 1)
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return malformedRecord("BLOCK_REMARK", "RECORD_REMARK_HOTNESS");
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Parser.Hotness = Record[0];
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break;
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}
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case RECORD_REMARK_ARG_WITH_DEBUGLOC: {
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if (Record.size() != 5)
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return malformedRecord("BLOCK_REMARK", "RECORD_REMARK_ARG_WITH_DEBUGLOC");
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// Create a temporary argument. Use that as a valid memory location for this
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// argument entry.
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Parser.TmpArgs.emplace_back();
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Parser.TmpArgs.back().KeyIdx = Record[0];
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Parser.TmpArgs.back().ValueIdx = Record[1];
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Parser.TmpArgs.back().SourceFileNameIdx = Record[2];
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Parser.TmpArgs.back().SourceLine = Record[3];
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Parser.TmpArgs.back().SourceColumn = Record[4];
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Parser.Args =
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ArrayRef<BitstreamRemarkParserHelper::Argument>(Parser.TmpArgs);
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break;
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}
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case RECORD_REMARK_ARG_WITHOUT_DEBUGLOC: {
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if (Record.size() != 2)
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return malformedRecord("BLOCK_REMARK",
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"RECORD_REMARK_ARG_WITHOUT_DEBUGLOC");
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// Create a temporary argument. Use that as a valid memory location for this
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// argument entry.
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Parser.TmpArgs.emplace_back();
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Parser.TmpArgs.back().KeyIdx = Record[0];
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Parser.TmpArgs.back().ValueIdx = Record[1];
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Parser.Args =
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ArrayRef<BitstreamRemarkParserHelper::Argument>(Parser.TmpArgs);
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break;
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}
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default:
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return unknownRecord("BLOCK_REMARK", *RecordID);
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}
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return Error::success();
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}
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template <typename T>
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static Error parseBlock(T &ParserHelper, unsigned BlockID,
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const char *BlockName) {
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BitstreamCursor &Stream = ParserHelper.Stream;
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Expected<BitstreamEntry> Next = Stream.advance();
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if (!Next)
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return Next.takeError();
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if (Next->Kind != BitstreamEntry::SubBlock || Next->ID != BlockID)
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing %s: expecting [ENTER_SUBBLOCK, %s, ...].",
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BlockName, BlockName);
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if (Stream.EnterSubBlock(BlockID))
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while entering %s.", BlockName);
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// Stop when there is nothing to read anymore or when we encounter an
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// END_BLOCK.
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while (!Stream.AtEndOfStream()) {
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Next = Stream.advance();
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if (!Next)
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return Next.takeError();
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switch (Next->Kind) {
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case BitstreamEntry::EndBlock:
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return Error::success();
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case BitstreamEntry::Error:
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case BitstreamEntry::SubBlock:
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing %s: expecting records.", BlockName);
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case BitstreamEntry::Record:
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if (Error E = parseRecord(ParserHelper, Next->ID))
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return E;
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continue;
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}
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}
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// If we're here, it means we didn't get an END_BLOCK yet, but we're at the
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// end of the stream. In this case, error.
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing %s: unterminated block.", BlockName);
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}
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Error BitstreamMetaParserHelper::parse() {
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return parseBlock(*this, META_BLOCK_ID, "META_BLOCK");
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}
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Error BitstreamRemarkParserHelper::parse() {
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return parseBlock(*this, REMARK_BLOCK_ID, "REMARK_BLOCK");
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}
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BitstreamParserHelper::BitstreamParserHelper(StringRef Buffer)
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: Stream(Buffer) {}
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Expected<std::array<char, 4>> BitstreamParserHelper::parseMagic() {
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std::array<char, 4> Result;
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for (unsigned i = 0; i < 4; ++i)
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if (Expected<unsigned> R = Stream.Read(8))
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Result[i] = *R;
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else
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return R.takeError();
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return Result;
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}
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Error BitstreamParserHelper::parseBlockInfoBlock() {
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Expected<BitstreamEntry> Next = Stream.advance();
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if (!Next)
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return Next.takeError();
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if (Next->Kind != BitstreamEntry::SubBlock ||
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Next->ID != llvm::bitc::BLOCKINFO_BLOCK_ID)
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing BLOCKINFO_BLOCK: expecting [ENTER_SUBBLOCK, "
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"BLOCKINFO_BLOCK, ...].");
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Expected<Optional<BitstreamBlockInfo>> MaybeBlockInfo =
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Stream.ReadBlockInfoBlock();
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if (!MaybeBlockInfo)
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return MaybeBlockInfo.takeError();
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if (!*MaybeBlockInfo)
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing BLOCKINFO_BLOCK.");
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BlockInfo = **MaybeBlockInfo;
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Stream.setBlockInfo(&BlockInfo);
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return Error::success();
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}
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static Expected<bool> isBlock(BitstreamCursor &Stream, unsigned BlockID) {
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bool Result = false;
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uint64_t PreviousBitNo = Stream.GetCurrentBitNo();
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Expected<BitstreamEntry> Next = Stream.advance();
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if (!Next)
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return Next.takeError();
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switch (Next->Kind) {
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case BitstreamEntry::SubBlock:
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// Check for the block id.
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Result = Next->ID == BlockID;
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break;
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case BitstreamEntry::Error:
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Unexpected error while parsing bitstream.");
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default:
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Result = false;
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break;
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}
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if (Error E = Stream.JumpToBit(PreviousBitNo))
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return std::move(E);
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return Result;
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}
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Expected<bool> BitstreamParserHelper::isMetaBlock() {
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return isBlock(Stream, META_BLOCK_ID);
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}
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Expected<bool> BitstreamParserHelper::isRemarkBlock() {
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return isBlock(Stream, META_BLOCK_ID);
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}
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static Error validateMagicNumber(StringRef MagicNumber) {
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if (MagicNumber != remarks::ContainerMagic)
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return createStringError(std::make_error_code(std::errc::invalid_argument),
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"Unknown magic number: expecting %s, got %.4s.",
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remarks::ContainerMagic.data(), MagicNumber.data());
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return Error::success();
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}
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static Error advanceToMetaBlock(BitstreamParserHelper &Helper) {
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Expected<std::array<char, 4>> MagicNumber = Helper.parseMagic();
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if (!MagicNumber)
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return MagicNumber.takeError();
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if (Error E = validateMagicNumber(
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StringRef(MagicNumber->data(), MagicNumber->size())))
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return E;
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if (Error E = Helper.parseBlockInfoBlock())
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return E;
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Expected<bool> isMetaBlock = Helper.isMetaBlock();
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if (!isMetaBlock)
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return isMetaBlock.takeError();
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if (!*isMetaBlock)
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Expecting META_BLOCK after the BLOCKINFO_BLOCK.");
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return Error::success();
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}
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Expected<std::unique_ptr<BitstreamRemarkParser>>
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remarks::createBitstreamParserFromMeta(
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StringRef Buf, Optional<ParsedStringTable> StrTab,
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Optional<StringRef> ExternalFilePrependPath) {
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BitstreamParserHelper Helper(Buf);
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Expected<std::array<char, 4>> MagicNumber = Helper.parseMagic();
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if (!MagicNumber)
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return MagicNumber.takeError();
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if (Error E = validateMagicNumber(
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StringRef(MagicNumber->data(), MagicNumber->size())))
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return std::move(E);
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auto Parser =
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StrTab ? std::make_unique<BitstreamRemarkParser>(Buf, std::move(*StrTab))
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: std::make_unique<BitstreamRemarkParser>(Buf);
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if (ExternalFilePrependPath)
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Parser->ExternalFilePrependPath = *ExternalFilePrependPath;
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return std::move(Parser);
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}
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Expected<std::unique_ptr<Remark>> BitstreamRemarkParser::next() {
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if (ParserHelper.atEndOfStream())
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return make_error<EndOfFileError>();
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if (!ReadyToParseRemarks) {
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if (Error E = parseMeta())
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return std::move(E);
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ReadyToParseRemarks = true;
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}
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return parseRemark();
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}
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Error BitstreamRemarkParser::parseMeta() {
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// Advance and to the meta block.
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if (Error E = advanceToMetaBlock(ParserHelper))
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return E;
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BitstreamMetaParserHelper MetaHelper(ParserHelper.Stream,
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ParserHelper.BlockInfo);
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if (Error E = MetaHelper.parse())
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return E;
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if (Error E = processCommonMeta(MetaHelper))
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return E;
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switch (ContainerType) {
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case BitstreamRemarkContainerType::Standalone:
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return processStandaloneMeta(MetaHelper);
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case BitstreamRemarkContainerType::SeparateRemarksFile:
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return processSeparateRemarksFileMeta(MetaHelper);
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case BitstreamRemarkContainerType::SeparateRemarksMeta:
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return processSeparateRemarksMetaMeta(MetaHelper);
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}
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llvm_unreachable("Unknown BitstreamRemarkContainerType enum");
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}
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Error BitstreamRemarkParser::processCommonMeta(
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BitstreamMetaParserHelper &Helper) {
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if (Optional<uint64_t> Version = Helper.ContainerVersion)
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ContainerVersion = *Version;
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else
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing BLOCK_META: missing container version.");
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if (Optional<uint8_t> Type = Helper.ContainerType) {
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// Always >= BitstreamRemarkContainerType::First since it's unsigned.
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if (*Type > static_cast<uint8_t>(BitstreamRemarkContainerType::Last))
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing BLOCK_META: invalid container type.");
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ContainerType = static_cast<BitstreamRemarkContainerType>(*Type);
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} else
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing BLOCK_META: missing container type.");
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return Error::success();
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}
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static Error processStrTab(BitstreamRemarkParser &P,
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Optional<StringRef> StrTabBuf) {
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if (!StrTabBuf)
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing BLOCK_META: missing string table.");
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// Parse and assign the string table.
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P.StrTab.emplace(*StrTabBuf);
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return Error::success();
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}
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static Error processRemarkVersion(BitstreamRemarkParser &P,
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Optional<uint64_t> RemarkVersion) {
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if (!RemarkVersion)
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing BLOCK_META: missing remark version.");
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P.RemarkVersion = *RemarkVersion;
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return Error::success();
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}
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Error BitstreamRemarkParser::processExternalFilePath(
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Optional<StringRef> ExternalFilePath) {
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if (!ExternalFilePath)
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing BLOCK_META: missing external file path.");
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SmallString<80> FullPath(ExternalFilePrependPath);
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sys::path::append(FullPath, *ExternalFilePath);
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// External file: open the external file, parse it, check if its metadata
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// matches the one from the separate metadata, then replace the current parser
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// with the one parsing the remarks.
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ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
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MemoryBuffer::getFile(FullPath);
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if (std::error_code EC = BufferOrErr.getError())
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return createFileError(FullPath, EC);
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TmpRemarkBuffer = std::move(*BufferOrErr);
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// Don't try to parse the file if it's empty.
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if (TmpRemarkBuffer->getBufferSize() == 0)
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return make_error<EndOfFileError>();
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// Create a separate parser used for parsing the separate file.
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ParserHelper = BitstreamParserHelper(TmpRemarkBuffer->getBuffer());
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// Advance and check until we can parse the meta block.
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if (Error E = advanceToMetaBlock(ParserHelper))
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return E;
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// Parse the meta from the separate file.
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// Note: here we overwrite the BlockInfo with the one from the file. This will
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// be used to parse the rest of the file.
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BitstreamMetaParserHelper SeparateMetaHelper(ParserHelper.Stream,
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ParserHelper.BlockInfo);
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if (Error E = SeparateMetaHelper.parse())
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return E;
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uint64_t PreviousContainerVersion = ContainerVersion;
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if (Error E = processCommonMeta(SeparateMetaHelper))
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return E;
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if (ContainerType != BitstreamRemarkContainerType::SeparateRemarksFile)
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing external file's BLOCK_META: wrong container "
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"type.");
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if (PreviousContainerVersion != ContainerVersion)
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return createStringError(
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std::make_error_code(std::errc::illegal_byte_sequence),
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"Error while parsing external file's BLOCK_META: mismatching versions: "
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"original meta: %lu, external file meta: %lu.",
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PreviousContainerVersion, ContainerVersion);
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// Process the meta from the separate file.
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return processSeparateRemarksFileMeta(SeparateMetaHelper);
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}
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Error BitstreamRemarkParser::processStandaloneMeta(
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BitstreamMetaParserHelper &Helper) {
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if (Error E = processStrTab(*this, Helper.StrTabBuf))
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return E;
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return processRemarkVersion(*this, Helper.RemarkVersion);
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}
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Error BitstreamRemarkParser::processSeparateRemarksFileMeta(
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BitstreamMetaParserHelper &Helper) {
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return processRemarkVersion(*this, Helper.RemarkVersion);
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}
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Error BitstreamRemarkParser::processSeparateRemarksMetaMeta(
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BitstreamMetaParserHelper &Helper) {
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if (Error E = processStrTab(*this, Helper.StrTabBuf))
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return E;
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return processExternalFilePath(Helper.ExternalFilePath);
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}
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Expected<std::unique_ptr<Remark>> BitstreamRemarkParser::parseRemark() {
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BitstreamRemarkParserHelper RemarkHelper(ParserHelper.Stream);
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if (Error E = RemarkHelper.parse())
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return std::move(E);
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return processRemark(RemarkHelper);
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}
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Expected<std::unique_ptr<Remark>>
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BitstreamRemarkParser::processRemark(BitstreamRemarkParserHelper &Helper) {
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std::unique_ptr<Remark> Result = std::make_unique<Remark>();
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Remark &R = *Result;
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|
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if (StrTab == None)
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return createStringError(
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|
std::make_error_code(std::errc::invalid_argument),
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|
"Error while parsing BLOCK_REMARK: missing string table.");
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|
|
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if (!Helper.Type)
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return createStringError(
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|
std::make_error_code(std::errc::illegal_byte_sequence),
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|
"Error while parsing BLOCK_REMARK: missing remark type.");
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|
|
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// Always >= Type::First since it's unsigned.
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if (*Helper.Type > static_cast<uint8_t>(Type::Last))
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return createStringError(
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|
std::make_error_code(std::errc::illegal_byte_sequence),
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|
"Error while parsing BLOCK_REMARK: unknown remark type.");
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|
|
|
R.RemarkType = static_cast<Type>(*Helper.Type);
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|
|
|
if (!Helper.RemarkNameIdx)
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|
return createStringError(
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|
std::make_error_code(std::errc::illegal_byte_sequence),
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|
"Error while parsing BLOCK_REMARK: missing remark name.");
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|
|
|
if (Expected<StringRef> RemarkName = (*StrTab)[*Helper.RemarkNameIdx])
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|
R.RemarkName = *RemarkName;
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|
else
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|
return RemarkName.takeError();
|
|
|
|
if (!Helper.PassNameIdx)
|
|
return createStringError(
|
|
std::make_error_code(std::errc::illegal_byte_sequence),
|
|
"Error while parsing BLOCK_REMARK: missing remark pass.");
|
|
|
|
if (Expected<StringRef> PassName = (*StrTab)[*Helper.PassNameIdx])
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|
R.PassName = *PassName;
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|
else
|
|
return PassName.takeError();
|
|
|
|
if (!Helper.FunctionNameIdx)
|
|
return createStringError(
|
|
std::make_error_code(std::errc::illegal_byte_sequence),
|
|
"Error while parsing BLOCK_REMARK: missing remark function name.");
|
|
if (Expected<StringRef> FunctionName = (*StrTab)[*Helper.FunctionNameIdx])
|
|
R.FunctionName = *FunctionName;
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|
else
|
|
return FunctionName.takeError();
|
|
|
|
if (Helper.SourceFileNameIdx && Helper.SourceLine && Helper.SourceColumn) {
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|
Expected<StringRef> SourceFileName = (*StrTab)[*Helper.SourceFileNameIdx];
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|
if (!SourceFileName)
|
|
return SourceFileName.takeError();
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|
R.Loc.emplace();
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|
R.Loc->SourceFilePath = *SourceFileName;
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|
R.Loc->SourceLine = *Helper.SourceLine;
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|
R.Loc->SourceColumn = *Helper.SourceColumn;
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|
}
|
|
|
|
if (Helper.Hotness)
|
|
R.Hotness = *Helper.Hotness;
|
|
|
|
if (!Helper.Args)
|
|
return std::move(Result);
|
|
|
|
for (const BitstreamRemarkParserHelper::Argument &Arg : *Helper.Args) {
|
|
if (!Arg.KeyIdx)
|
|
return createStringError(
|
|
std::make_error_code(std::errc::illegal_byte_sequence),
|
|
"Error while parsing BLOCK_REMARK: missing key in remark argument.");
|
|
if (!Arg.ValueIdx)
|
|
return createStringError(
|
|
std::make_error_code(std::errc::illegal_byte_sequence),
|
|
"Error while parsing BLOCK_REMARK: missing value in remark "
|
|
"argument.");
|
|
|
|
// We have at least a key and a value, create an entry.
|
|
R.Args.emplace_back();
|
|
|
|
if (Expected<StringRef> Key = (*StrTab)[*Arg.KeyIdx])
|
|
R.Args.back().Key = *Key;
|
|
else
|
|
return Key.takeError();
|
|
|
|
if (Expected<StringRef> Value = (*StrTab)[*Arg.ValueIdx])
|
|
R.Args.back().Val = *Value;
|
|
else
|
|
return Value.takeError();
|
|
|
|
if (Arg.SourceFileNameIdx && Arg.SourceLine && Arg.SourceColumn) {
|
|
if (Expected<StringRef> SourceFileName =
|
|
(*StrTab)[*Arg.SourceFileNameIdx]) {
|
|
R.Args.back().Loc.emplace();
|
|
R.Args.back().Loc->SourceFilePath = *SourceFileName;
|
|
R.Args.back().Loc->SourceLine = *Arg.SourceLine;
|
|
R.Args.back().Loc->SourceColumn = *Arg.SourceColumn;
|
|
} else
|
|
return SourceFileName.takeError();
|
|
}
|
|
}
|
|
|
|
return std::move(Result);
|
|
}
|