372 lines
12 KiB
C++
372 lines
12 KiB
C++
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//===- SerializedDiagnosticReader.cpp - Reads diagnostics -----------------===//
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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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#include "clang/Frontend/SerializedDiagnosticReader.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/FileSystemOptions.h"
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#include "clang/Frontend/SerializedDiagnostics.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Bitstream/BitCodes.h"
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#include "llvm/Bitstream/BitstreamReader.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/ManagedStatic.h"
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#include <cstdint>
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#include <system_error>
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using namespace clang;
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using namespace serialized_diags;
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std::error_code SerializedDiagnosticReader::readDiagnostics(StringRef File) {
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// Open the diagnostics file.
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FileSystemOptions FO;
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FileManager FileMgr(FO);
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auto Buffer = FileMgr.getBufferForFile(File);
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if (!Buffer)
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return SDError::CouldNotLoad;
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llvm::BitstreamCursor Stream(**Buffer);
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Optional<llvm::BitstreamBlockInfo> BlockInfo;
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if (Stream.AtEndOfStream())
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return SDError::InvalidSignature;
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// Sniff for the signature.
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for (unsigned char C : {'D', 'I', 'A', 'G'}) {
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if (Expected<llvm::SimpleBitstreamCursor::word_t> Res = Stream.Read(8)) {
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if (Res.get() == C)
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continue;
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} else {
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// FIXME this drops the error on the floor.
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consumeError(Res.takeError());
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}
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return SDError::InvalidSignature;
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}
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// Read the top level blocks.
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while (!Stream.AtEndOfStream()) {
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if (Expected<unsigned> Res = Stream.ReadCode()) {
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if (Res.get() != llvm::bitc::ENTER_SUBBLOCK)
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return SDError::InvalidDiagnostics;
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} else {
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// FIXME this drops the error on the floor.
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consumeError(Res.takeError());
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return SDError::InvalidDiagnostics;
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}
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std::error_code EC;
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Expected<unsigned> MaybeSubBlockID = Stream.ReadSubBlockID();
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if (!MaybeSubBlockID) {
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// FIXME this drops the error on the floor.
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consumeError(MaybeSubBlockID.takeError());
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return SDError::InvalidDiagnostics;
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}
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switch (MaybeSubBlockID.get()) {
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case llvm::bitc::BLOCKINFO_BLOCK_ID: {
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Expected<Optional<llvm::BitstreamBlockInfo>> MaybeBlockInfo =
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Stream.ReadBlockInfoBlock();
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if (!MaybeBlockInfo) {
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// FIXME this drops the error on the floor.
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consumeError(MaybeBlockInfo.takeError());
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return SDError::InvalidDiagnostics;
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}
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BlockInfo = std::move(MaybeBlockInfo.get());
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}
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if (!BlockInfo)
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return SDError::MalformedBlockInfoBlock;
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Stream.setBlockInfo(&*BlockInfo);
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continue;
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case BLOCK_META:
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if ((EC = readMetaBlock(Stream)))
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return EC;
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continue;
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case BLOCK_DIAG:
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if ((EC = readDiagnosticBlock(Stream)))
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return EC;
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continue;
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default:
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if (llvm::Error Err = Stream.SkipBlock()) {
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// FIXME this drops the error on the floor.
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consumeError(std::move(Err));
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return SDError::MalformedTopLevelBlock;
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}
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continue;
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}
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}
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return {};
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}
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enum class SerializedDiagnosticReader::Cursor {
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Record = 1,
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BlockEnd,
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BlockBegin
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};
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llvm::ErrorOr<SerializedDiagnosticReader::Cursor>
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SerializedDiagnosticReader::skipUntilRecordOrBlock(
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llvm::BitstreamCursor &Stream, unsigned &BlockOrRecordID) {
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BlockOrRecordID = 0;
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while (!Stream.AtEndOfStream()) {
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unsigned Code;
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if (Expected<unsigned> Res = Stream.ReadCode())
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Code = Res.get();
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else
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return llvm::errorToErrorCode(Res.takeError());
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if (Code >= static_cast<unsigned>(llvm::bitc::FIRST_APPLICATION_ABBREV)) {
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// We found a record.
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BlockOrRecordID = Code;
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return Cursor::Record;
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}
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switch (static_cast<llvm::bitc::FixedAbbrevIDs>(Code)) {
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case llvm::bitc::ENTER_SUBBLOCK:
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if (Expected<unsigned> Res = Stream.ReadSubBlockID())
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BlockOrRecordID = Res.get();
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else
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return llvm::errorToErrorCode(Res.takeError());
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return Cursor::BlockBegin;
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case llvm::bitc::END_BLOCK:
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if (Stream.ReadBlockEnd())
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return SDError::InvalidDiagnostics;
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return Cursor::BlockEnd;
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case llvm::bitc::DEFINE_ABBREV:
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if (llvm::Error Err = Stream.ReadAbbrevRecord())
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return llvm::errorToErrorCode(std::move(Err));
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continue;
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case llvm::bitc::UNABBREV_RECORD:
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return SDError::UnsupportedConstruct;
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case llvm::bitc::FIRST_APPLICATION_ABBREV:
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llvm_unreachable("Unexpected abbrev id.");
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}
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}
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return SDError::InvalidDiagnostics;
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}
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std::error_code
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SerializedDiagnosticReader::readMetaBlock(llvm::BitstreamCursor &Stream) {
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if (llvm::Error Err =
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Stream.EnterSubBlock(clang::serialized_diags::BLOCK_META)) {
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// FIXME this drops the error on the floor.
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consumeError(std::move(Err));
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return SDError::MalformedMetadataBlock;
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}
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bool VersionChecked = false;
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while (true) {
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unsigned BlockOrCode = 0;
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llvm::ErrorOr<Cursor> Res = skipUntilRecordOrBlock(Stream, BlockOrCode);
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if (!Res)
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Res.getError();
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switch (Res.get()) {
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case Cursor::Record:
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break;
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case Cursor::BlockBegin:
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if (llvm::Error Err = Stream.SkipBlock()) {
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// FIXME this drops the error on the floor.
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consumeError(std::move(Err));
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return SDError::MalformedMetadataBlock;
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}
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LLVM_FALLTHROUGH;
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case Cursor::BlockEnd:
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if (!VersionChecked)
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return SDError::MissingVersion;
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return {};
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}
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SmallVector<uint64_t, 1> Record;
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Expected<unsigned> MaybeRecordID = Stream.readRecord(BlockOrCode, Record);
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if (!MaybeRecordID)
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return errorToErrorCode(MaybeRecordID.takeError());
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unsigned RecordID = MaybeRecordID.get();
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if (RecordID == RECORD_VERSION) {
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if (Record.size() < 1)
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return SDError::MissingVersion;
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if (Record[0] > VersionNumber)
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return SDError::VersionMismatch;
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VersionChecked = true;
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}
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}
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}
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std::error_code
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SerializedDiagnosticReader::readDiagnosticBlock(llvm::BitstreamCursor &Stream) {
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if (llvm::Error Err =
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Stream.EnterSubBlock(clang::serialized_diags::BLOCK_DIAG)) {
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// FIXME this drops the error on the floor.
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consumeError(std::move(Err));
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return SDError::MalformedDiagnosticBlock;
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}
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std::error_code EC;
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if ((EC = visitStartOfDiagnostic()))
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return EC;
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SmallVector<uint64_t, 16> Record;
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while (true) {
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unsigned BlockOrCode = 0;
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llvm::ErrorOr<Cursor> Res = skipUntilRecordOrBlock(Stream, BlockOrCode);
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if (!Res)
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Res.getError();
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switch (Res.get()) {
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case Cursor::BlockBegin:
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// The only blocks we care about are subdiagnostics.
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if (BlockOrCode == serialized_diags::BLOCK_DIAG) {
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if ((EC = readDiagnosticBlock(Stream)))
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return EC;
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} else if (llvm::Error Err = Stream.SkipBlock()) {
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// FIXME this drops the error on the floor.
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consumeError(std::move(Err));
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return SDError::MalformedSubBlock;
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}
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continue;
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case Cursor::BlockEnd:
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if ((EC = visitEndOfDiagnostic()))
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return EC;
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return {};
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case Cursor::Record:
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break;
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}
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// Read the record.
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Record.clear();
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StringRef Blob;
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Expected<unsigned> MaybeRecID =
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Stream.readRecord(BlockOrCode, Record, &Blob);
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if (!MaybeRecID)
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return errorToErrorCode(MaybeRecID.takeError());
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unsigned RecID = MaybeRecID.get();
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if (RecID < serialized_diags::RECORD_FIRST ||
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RecID > serialized_diags::RECORD_LAST)
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continue;
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switch ((RecordIDs)RecID) {
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case RECORD_CATEGORY:
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// A category has ID and name size.
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if (Record.size() != 2)
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return SDError::MalformedDiagnosticRecord;
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if ((EC = visitCategoryRecord(Record[0], Blob)))
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return EC;
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continue;
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case RECORD_DIAG:
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// A diagnostic has severity, location (4), category, flag, and message
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// size.
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if (Record.size() != 8)
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return SDError::MalformedDiagnosticRecord;
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if ((EC = visitDiagnosticRecord(
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Record[0], Location(Record[1], Record[2], Record[3], Record[4]),
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Record[5], Record[6], Blob)))
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return EC;
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continue;
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case RECORD_DIAG_FLAG:
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// A diagnostic flag has ID and name size.
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if (Record.size() != 2)
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return SDError::MalformedDiagnosticRecord;
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if ((EC = visitDiagFlagRecord(Record[0], Blob)))
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return EC;
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continue;
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case RECORD_FILENAME:
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// A filename has ID, size, timestamp, and name size. The size and
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// timestamp are legacy fields that are always zero these days.
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if (Record.size() != 4)
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return SDError::MalformedDiagnosticRecord;
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if ((EC = visitFilenameRecord(Record[0], Record[1], Record[2], Blob)))
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return EC;
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continue;
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case RECORD_FIXIT:
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// A fixit has two locations (4 each) and message size.
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if (Record.size() != 9)
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return SDError::MalformedDiagnosticRecord;
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if ((EC = visitFixitRecord(
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Location(Record[0], Record[1], Record[2], Record[3]),
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Location(Record[4], Record[5], Record[6], Record[7]), Blob)))
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return EC;
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continue;
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case RECORD_SOURCE_RANGE:
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// A source range is two locations (4 each).
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if (Record.size() != 8)
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return SDError::MalformedDiagnosticRecord;
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if ((EC = visitSourceRangeRecord(
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Location(Record[0], Record[1], Record[2], Record[3]),
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Location(Record[4], Record[5], Record[6], Record[7]))))
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return EC;
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continue;
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case RECORD_VERSION:
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// A version is just a number.
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if (Record.size() != 1)
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return SDError::MalformedDiagnosticRecord;
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if ((EC = visitVersionRecord(Record[0])))
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return EC;
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continue;
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}
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}
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}
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namespace {
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class SDErrorCategoryType final : public std::error_category {
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const char *name() const noexcept override {
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return "clang.serialized_diags";
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}
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std::string message(int IE) const override {
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auto E = static_cast<SDError>(IE);
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switch (E) {
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case SDError::CouldNotLoad:
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return "Failed to open diagnostics file";
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case SDError::InvalidSignature:
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return "Invalid diagnostics signature";
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case SDError::InvalidDiagnostics:
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return "Parse error reading diagnostics";
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case SDError::MalformedTopLevelBlock:
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return "Malformed block at top-level of diagnostics";
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case SDError::MalformedSubBlock:
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return "Malformed sub-block in a diagnostic";
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case SDError::MalformedBlockInfoBlock:
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return "Malformed BlockInfo block";
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case SDError::MalformedMetadataBlock:
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return "Malformed Metadata block";
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case SDError::MalformedDiagnosticBlock:
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return "Malformed Diagnostic block";
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case SDError::MalformedDiagnosticRecord:
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return "Malformed Diagnostic record";
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case SDError::MissingVersion:
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return "No version provided in diagnostics";
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case SDError::VersionMismatch:
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return "Unsupported diagnostics version";
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case SDError::UnsupportedConstruct:
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return "Bitcode constructs that are not supported in diagnostics appear";
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case SDError::HandlerFailed:
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return "Generic error occurred while handling a record";
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}
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llvm_unreachable("Unknown error type!");
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}
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};
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} // namespace
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static llvm::ManagedStatic<SDErrorCategoryType> ErrorCategory;
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const std::error_category &clang::serialized_diags::SDErrorCategory() {
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return *ErrorCategory;
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}
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