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373 lines
12 KiB
C++
373 lines
12 KiB
C++
//===- CodeViewRecordIO.cpp -------------------------------------*- C++ -*-===//
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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 "llvm/DebugInfo/CodeView/CodeViewRecordIO.h"
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#include "llvm/DebugInfo/CodeView/CodeView.h"
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#include "llvm/DebugInfo/CodeView/RecordSerialization.h"
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#include "llvm/Support/BinaryStreamReader.h"
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#include "llvm/Support/BinaryStreamWriter.h"
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using namespace llvm;
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using namespace llvm::codeview;
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Error CodeViewRecordIO::beginRecord(Optional<uint32_t> MaxLength) {
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RecordLimit Limit;
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Limit.MaxLength = MaxLength;
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Limit.BeginOffset = getCurrentOffset();
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Limits.push_back(Limit);
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return Error::success();
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}
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Error CodeViewRecordIO::endRecord() {
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assert(!Limits.empty() && "Not in a record!");
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Limits.pop_back();
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// We would like to assert that we actually read / wrote all the bytes that we
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// expected to for this record, but unfortunately we can't do this. Some
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// producers such as MASM over-allocate for certain types of records and
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// commit the extraneous data, so when reading we can't be sure every byte
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// will have been read. And when writing we over-allocate temporarily since
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// we don't know how big the record is until we're finished writing it, so
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// even though we don't commit the extraneous data, we still can't guarantee
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// we're at the end of the allocated data.
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if (isStreaming()) {
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// For streaming mode, add padding to align with 4 byte boundaries for each
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// record
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uint32_t Align = getStreamedLen() % 4;
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if (Align == 0)
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return Error::success();
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int PaddingBytes = 4 - Align;
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while (PaddingBytes > 0) {
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char Pad = static_cast<uint8_t>(LF_PAD0 + PaddingBytes);
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StringRef BytesSR = StringRef(&Pad, sizeof(Pad));
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Streamer->emitBytes(BytesSR);
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--PaddingBytes;
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}
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resetStreamedLen();
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}
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return Error::success();
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}
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uint32_t CodeViewRecordIO::maxFieldLength() const {
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if (isStreaming())
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return 0;
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assert(!Limits.empty() && "Not in a record!");
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// The max length of the next field is the minimum of all lengths that would
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// be allowed by any of the sub-records we're in. In practice, we can only
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// ever be at most 1 sub-record deep (in a FieldList), but this works for
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// the general case.
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uint32_t Offset = getCurrentOffset();
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Optional<uint32_t> Min = Limits.front().bytesRemaining(Offset);
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for (auto X : makeArrayRef(Limits).drop_front()) {
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Optional<uint32_t> ThisMin = X.bytesRemaining(Offset);
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if (ThisMin.hasValue())
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Min = (Min.hasValue()) ? std::min(*Min, *ThisMin) : *ThisMin;
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}
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assert(Min.hasValue() && "Every field must have a maximum length!");
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return *Min;
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}
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Error CodeViewRecordIO::padToAlignment(uint32_t Align) {
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if (isReading())
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return Reader->padToAlignment(Align);
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return Writer->padToAlignment(Align);
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}
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Error CodeViewRecordIO::skipPadding() {
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assert(!isWriting() && "Cannot skip padding while writing!");
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if (Reader->bytesRemaining() == 0)
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return Error::success();
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uint8_t Leaf = Reader->peek();
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if (Leaf < LF_PAD0)
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return Error::success();
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// Leaf is greater than 0xf0. We should advance by the number of bytes in
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// the low 4 bits.
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unsigned BytesToAdvance = Leaf & 0x0F;
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return Reader->skip(BytesToAdvance);
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}
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Error CodeViewRecordIO::mapByteVectorTail(ArrayRef<uint8_t> &Bytes,
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const Twine &Comment) {
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if (isStreaming()) {
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emitComment(Comment);
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Streamer->emitBinaryData(toStringRef(Bytes));
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incrStreamedLen(Bytes.size());
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} else if (isWriting()) {
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if (auto EC = Writer->writeBytes(Bytes))
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return EC;
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} else {
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if (auto EC = Reader->readBytes(Bytes, Reader->bytesRemaining()))
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return EC;
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}
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return Error::success();
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}
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Error CodeViewRecordIO::mapByteVectorTail(std::vector<uint8_t> &Bytes,
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const Twine &Comment) {
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ArrayRef<uint8_t> BytesRef(Bytes);
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if (auto EC = mapByteVectorTail(BytesRef, Comment))
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return EC;
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if (!isWriting())
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Bytes.assign(BytesRef.begin(), BytesRef.end());
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return Error::success();
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}
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Error CodeViewRecordIO::mapInteger(TypeIndex &TypeInd, const Twine &Comment) {
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if (isStreaming()) {
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std::string TypeNameStr = Streamer->getTypeName(TypeInd);
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if (!TypeNameStr.empty())
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emitComment(Comment + ": " + TypeNameStr);
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else
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emitComment(Comment);
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Streamer->emitIntValue(TypeInd.getIndex(), sizeof(TypeInd.getIndex()));
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incrStreamedLen(sizeof(TypeInd.getIndex()));
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} else if (isWriting()) {
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if (auto EC = Writer->writeInteger(TypeInd.getIndex()))
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return EC;
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} else {
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uint32_t I;
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if (auto EC = Reader->readInteger(I))
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return EC;
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TypeInd.setIndex(I);
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}
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return Error::success();
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}
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Error CodeViewRecordIO::mapEncodedInteger(int64_t &Value,
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const Twine &Comment) {
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if (isStreaming()) {
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if (Value >= 0)
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emitEncodedUnsignedInteger(static_cast<uint64_t>(Value), Comment);
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else
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emitEncodedSignedInteger(Value, Comment);
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} else if (isWriting()) {
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if (Value >= 0) {
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if (auto EC = writeEncodedUnsignedInteger(static_cast<uint64_t>(Value)))
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return EC;
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} else {
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if (auto EC = writeEncodedSignedInteger(Value))
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return EC;
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}
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} else {
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APSInt N;
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if (auto EC = consume(*Reader, N))
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return EC;
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Value = N.getExtValue();
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}
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return Error::success();
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}
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Error CodeViewRecordIO::mapEncodedInteger(uint64_t &Value,
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const Twine &Comment) {
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if (isStreaming())
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emitEncodedUnsignedInteger(Value, Comment);
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else if (isWriting()) {
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if (auto EC = writeEncodedUnsignedInteger(Value))
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return EC;
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} else {
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APSInt N;
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if (auto EC = consume(*Reader, N))
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return EC;
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Value = N.getZExtValue();
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}
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return Error::success();
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}
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Error CodeViewRecordIO::mapEncodedInteger(APSInt &Value, const Twine &Comment) {
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if (isStreaming()) {
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if (Value.isSigned())
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emitEncodedSignedInteger(Value.getSExtValue(), Comment);
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else
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emitEncodedUnsignedInteger(Value.getZExtValue(), Comment);
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} else if (isWriting()) {
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if (Value.isSigned())
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return writeEncodedSignedInteger(Value.getSExtValue());
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return writeEncodedUnsignedInteger(Value.getZExtValue());
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} else
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return consume(*Reader, Value);
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return Error::success();
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}
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Error CodeViewRecordIO::mapStringZ(StringRef &Value, const Twine &Comment) {
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if (isStreaming()) {
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auto NullTerminatedString = StringRef(Value.data(), Value.size() + 1);
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emitComment(Comment);
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Streamer->emitBytes(NullTerminatedString);
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incrStreamedLen(NullTerminatedString.size());
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} else if (isWriting()) {
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// Truncate if we attempt to write too much.
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StringRef S = Value.take_front(maxFieldLength() - 1);
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if (auto EC = Writer->writeCString(S))
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return EC;
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} else {
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if (auto EC = Reader->readCString(Value))
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return EC;
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}
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return Error::success();
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}
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Error CodeViewRecordIO::mapGuid(GUID &Guid, const Twine &Comment) {
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constexpr uint32_t GuidSize = 16;
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if (isStreaming()) {
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StringRef GuidSR =
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StringRef((reinterpret_cast<const char *>(&Guid)), GuidSize);
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emitComment(Comment);
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Streamer->emitBytes(GuidSR);
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incrStreamedLen(GuidSize);
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return Error::success();
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}
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if (maxFieldLength() < GuidSize)
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return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
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if (isWriting()) {
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if (auto EC = Writer->writeBytes(Guid.Guid))
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return EC;
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} else {
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ArrayRef<uint8_t> GuidBytes;
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if (auto EC = Reader->readBytes(GuidBytes, GuidSize))
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return EC;
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memcpy(Guid.Guid, GuidBytes.data(), GuidSize);
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}
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return Error::success();
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}
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Error CodeViewRecordIO::mapStringZVectorZ(std::vector<StringRef> &Value,
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const Twine &Comment) {
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if (!isReading()) {
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emitComment(Comment);
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for (auto V : Value) {
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if (auto EC = mapStringZ(V))
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return EC;
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}
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uint8_t FinalZero = 0;
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if (auto EC = mapInteger(FinalZero))
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return EC;
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} else {
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StringRef S;
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if (auto EC = mapStringZ(S))
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return EC;
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while (!S.empty()) {
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Value.push_back(S);
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if (auto EC = mapStringZ(S))
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return EC;
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};
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}
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return Error::success();
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}
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void CodeViewRecordIO::emitEncodedSignedInteger(const int64_t &Value,
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const Twine &Comment) {
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assert(Value < 0 && "Encoded integer is not signed!");
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if (Value >= std::numeric_limits<int8_t>::min()) {
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Streamer->emitIntValue(LF_CHAR, 2);
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emitComment(Comment);
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Streamer->emitIntValue(Value, 1);
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incrStreamedLen(3);
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} else if (Value >= std::numeric_limits<int16_t>::min()) {
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Streamer->emitIntValue(LF_SHORT, 2);
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emitComment(Comment);
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Streamer->emitIntValue(Value, 2);
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incrStreamedLen(4);
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} else if (Value >= std::numeric_limits<int32_t>::min()) {
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Streamer->emitIntValue(LF_LONG, 2);
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emitComment(Comment);
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Streamer->emitIntValue(Value, 4);
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incrStreamedLen(6);
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} else {
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Streamer->emitIntValue(LF_QUADWORD, 2);
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emitComment(Comment);
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Streamer->emitIntValue(Value, 4);
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incrStreamedLen(6);
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}
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}
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void CodeViewRecordIO::emitEncodedUnsignedInteger(const uint64_t &Value,
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const Twine &Comment) {
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if (Value < LF_NUMERIC) {
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emitComment(Comment);
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Streamer->emitIntValue(Value, 2);
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incrStreamedLen(2);
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} else if (Value <= std::numeric_limits<uint16_t>::max()) {
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Streamer->emitIntValue(LF_USHORT, 2);
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emitComment(Comment);
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Streamer->emitIntValue(Value, 2);
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incrStreamedLen(4);
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} else if (Value <= std::numeric_limits<uint32_t>::max()) {
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Streamer->emitIntValue(LF_ULONG, 2);
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emitComment(Comment);
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Streamer->emitIntValue(Value, 4);
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incrStreamedLen(6);
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} else {
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Streamer->emitIntValue(LF_UQUADWORD, 2);
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emitComment(Comment);
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Streamer->emitIntValue(Value, 8);
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incrStreamedLen(6);
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}
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}
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Error CodeViewRecordIO::writeEncodedSignedInteger(const int64_t &Value) {
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assert(Value < 0 && "Encoded integer is not signed!");
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if (Value >= std::numeric_limits<int8_t>::min()) {
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if (auto EC = Writer->writeInteger<uint16_t>(LF_CHAR))
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return EC;
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if (auto EC = Writer->writeInteger<int8_t>(Value))
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return EC;
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} else if (Value >= std::numeric_limits<int16_t>::min()) {
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if (auto EC = Writer->writeInteger<uint16_t>(LF_SHORT))
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return EC;
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if (auto EC = Writer->writeInteger<int16_t>(Value))
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return EC;
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} else if (Value >= std::numeric_limits<int32_t>::min()) {
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if (auto EC = Writer->writeInteger<uint16_t>(LF_LONG))
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return EC;
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if (auto EC = Writer->writeInteger<int32_t>(Value))
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return EC;
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} else {
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if (auto EC = Writer->writeInteger<uint16_t>(LF_QUADWORD))
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return EC;
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if (auto EC = Writer->writeInteger(Value))
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return EC;
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}
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return Error::success();
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}
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Error CodeViewRecordIO::writeEncodedUnsignedInteger(const uint64_t &Value) {
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if (Value < LF_NUMERIC) {
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if (auto EC = Writer->writeInteger<uint16_t>(Value))
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return EC;
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} else if (Value <= std::numeric_limits<uint16_t>::max()) {
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if (auto EC = Writer->writeInteger<uint16_t>(LF_USHORT))
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return EC;
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if (auto EC = Writer->writeInteger<uint16_t>(Value))
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return EC;
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} else if (Value <= std::numeric_limits<uint32_t>::max()) {
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if (auto EC = Writer->writeInteger<uint16_t>(LF_ULONG))
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return EC;
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if (auto EC = Writer->writeInteger<uint32_t>(Value))
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return EC;
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} else {
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if (auto EC = Writer->writeInteger<uint16_t>(LF_UQUADWORD))
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return EC;
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if (auto EC = Writer->writeInteger(Value))
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return EC;
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}
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return Error::success();
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}
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