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DXContainer.cpp 
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//===- DXContainer.cpp - DXContainer object file implementation -----------===//
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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/Object/DXContainer.h"
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#include "llvm/BinaryFormat/DXContainer.h"
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#include "llvm/Object/Error.h"
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#include "llvm/Support/Alignment.h"
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#include "llvm/Support/FormatVariadic.h"
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using namespace llvm;
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using namespace llvm::object;
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static Error parseFailed(const Twine &Msg) {
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  return make_error<GenericBinaryError>(Msg.str(), object_error::parse_failed);
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}
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template <typename T>
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static Error readStruct(StringRef Buffer, const char *Src, T &Struct) {
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  // Don't read before the beginning or past the end of the file
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  if (Src < Buffer.begin() || Src + sizeof(T) > Buffer.end())
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    return parseFailed("Reading structure out of file bounds");
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  memcpy(&Struct, Src, sizeof(T));
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  // DXContainer is always little endian
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  if (sys::IsBigEndianHost)
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    Struct.swapBytes();
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  return Error::success();
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}
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template <typename T>
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static Error readInteger(StringRef Buffer, const char *Src, T &Val,
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                         Twine Str = "structure") {
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  static_assert(std::is_integral_v<T>,
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                "Cannot call readInteger on non-integral type.");
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  // Don't read before the beginning or past the end of the file
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  if (Src < Buffer.begin() || Src + sizeof(T) > Buffer.end())
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    return parseFailed(Twine("Reading ") + Str + " out of file bounds");
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  // The DXContainer offset table is comprised of uint32_t values but not padded
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  // to a 64-bit boundary. So Parts may start unaligned if there is an odd
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  // number of parts and part data itself is not required to be padded.
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  if (reinterpret_cast<uintptr_t>(Src) % alignof(T) != 0)
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    memcpy(reinterpret_cast<char *>(&Val), Src, sizeof(T));
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  else
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    Val = *reinterpret_cast<const T *>(Src);
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  // DXContainer is always little endian
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  if (sys::IsBigEndianHost)
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    sys::swapByteOrder(Val);
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  return Error::success();
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}
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DXContainer::DXContainer(MemoryBufferRef O) : Data(O) {}
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Error DXContainer::parseHeader() {
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  return readStruct(Data.getBuffer(), Data.getBuffer().data(), Header);
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}
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Error DXContainer::parseDXILHeader(StringRef Part) {
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  if (DXIL)
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    return parseFailed("More than one DXIL part is present in the file");
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  const char *Current = Part.begin();
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  dxbc::ProgramHeader Header;
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  if (Error Err = readStruct(Part, Current, Header))
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    return Err;
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  Current += offsetof(dxbc::ProgramHeader, Bitcode) + Header.Bitcode.Offset;
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  DXIL.emplace(std::make_pair(Header, Current));
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  return Error::success();
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}
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Error DXContainer::parseShaderFeatureFlags(StringRef Part) {
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  if (ShaderFeatureFlags)
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    return parseFailed("More than one SFI0 part is present in the file");
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  uint64_t FlagValue = 0;
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  if (Error Err = readInteger(Part, Part.begin(), FlagValue))
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    return Err;
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  ShaderFeatureFlags = FlagValue;
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  return Error::success();
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}
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Error DXContainer::parseHash(StringRef Part) {
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  if (Hash)
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    return parseFailed("More than one HASH part is present in the file");
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  dxbc::ShaderHash ReadHash;
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  if (Error Err = readStruct(Part, Part.begin(), ReadHash))
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    return Err;
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  Hash = ReadHash;
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  return Error::success();
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}
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Error DXContainer::parsePSVInfo(StringRef Part) {
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  if (PSVInfo)
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    return parseFailed("More than one PSV0 part is present in the file");
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  PSVInfo = DirectX::PSVRuntimeInfo(Part);
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  // Parsing the PSVRuntime info occurs late because we need to read data from
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  // other parts first.
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  return Error::success();
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}
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Error DirectX::Signature::initialize(StringRef Part) {
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  dxbc::ProgramSignatureHeader SigHeader;
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  if (Error Err = readStruct(Part, Part.begin(), SigHeader))
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    return Err;
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  size_t Size = sizeof(dxbc::ProgramSignatureElement) * SigHeader.ParamCount;
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  if (Part.size() < Size + SigHeader.FirstParamOffset)
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    return parseFailed("Signature parameters extend beyond the part boundary");
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  Parameters.Data = Part.substr(SigHeader.FirstParamOffset, Size);
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  StringTableOffset = SigHeader.FirstParamOffset + static_cast<uint32_t>(Size);
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  StringTable = Part.substr(SigHeader.FirstParamOffset + Size);
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  for (const auto &Param : Parameters) {
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    if (Param.NameOffset < StringTableOffset)
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      return parseFailed("Invalid parameter name offset: name starts before "
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                         "the first name offset");
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    if (Param.NameOffset - StringTableOffset > StringTable.size())
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      return parseFailed("Invalid parameter name offset: name starts after the "
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                         "end of the part data");
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  }
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  return Error::success();
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}
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Error DXContainer::parsePartOffsets() {
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  uint32_t LastOffset =
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      sizeof(dxbc::Header) + (Header.PartCount * sizeof(uint32_t));
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  const char *Current = Data.getBuffer().data() + sizeof(dxbc::Header);
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  for (uint32_t Part = 0; Part < Header.PartCount; ++Part) {
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    uint32_t PartOffset;
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    if (Error Err = readInteger(Data.getBuffer(), Current, PartOffset))
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      return Err;
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    if (PartOffset < LastOffset)
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      return parseFailed(
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          formatv(
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              "Part offset for part {0} begins before the previous part ends",
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              Part)
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              .str());
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    Current += sizeof(uint32_t);
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    if (PartOffset >= Data.getBufferSize())
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      return parseFailed("Part offset points beyond boundary of the file");
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    // To prevent overflow when reading the part name, we subtract the part name
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    // size from the buffer size, rather than adding to the offset. Since the
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    // file header is larger than the part header we can't reach this code
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    // unless the buffer is at least as large as a part header, so this
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    // subtraction can't underflow.
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    if (PartOffset >= Data.getBufferSize() - sizeof(dxbc::PartHeader::Name))
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      return parseFailed("File not large enough to read part name");
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    PartOffsets.push_back(PartOffset);
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    dxbc::PartType PT =
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        dxbc::parsePartType(Data.getBuffer().substr(PartOffset, 4));
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    uint32_t PartDataStart = PartOffset + sizeof(dxbc::PartHeader);
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    uint32_t PartSize;
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    if (Error Err = readInteger(Data.getBuffer(),
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                                Data.getBufferStart() + PartOffset + 4,
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                                PartSize, "part size"))
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      return Err;
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    StringRef PartData = Data.getBuffer().substr(PartDataStart, PartSize);
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    LastOffset = PartOffset + PartSize;
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    switch (PT) {
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    case dxbc::PartType::DXIL:
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      if (Error Err = parseDXILHeader(PartData))
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        return Err;
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      break;
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    case dxbc::PartType::SFI0:
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      if (Error Err = parseShaderFeatureFlags(PartData))
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        return Err;
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      break;
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    case dxbc::PartType::HASH:
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      if (Error Err = parseHash(PartData))
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        return Err;
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      break;
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    case dxbc::PartType::PSV0:
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      if (Error Err = parsePSVInfo(PartData))
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        return Err;
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      break;
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    case dxbc::PartType::ISG1:
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      if (Error Err = InputSignature.initialize(PartData))
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        return Err;
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      break;
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    case dxbc::PartType::OSG1:
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      if (Error Err = OutputSignature.initialize(PartData))
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        return Err;
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      break;
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    case dxbc::PartType::PSG1:
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      if (Error Err = PatchConstantSignature.initialize(PartData))
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        return Err;
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      break;
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    case dxbc::PartType::Unknown:
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      break;
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    }
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  }
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  // Fully parsing the PSVInfo requires knowing the shader kind which we read
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  // out of the program header in the DXIL part.
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  if (PSVInfo) {
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    if (!DXIL)
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      return parseFailed("Cannot fully parse pipeline state validation "
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                         "information without DXIL part.");
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    if (Error Err = PSVInfo->parse(DXIL->first.ShaderKind))
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      return Err;
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  }
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  return Error::success();
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}
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Expected<DXContainer> DXContainer::create(MemoryBufferRef Object) {
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  DXContainer Container(Object);
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  if (Error Err = Container.parseHeader())
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    return std::move(Err);
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  if (Error Err = Container.parsePartOffsets())
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    return std::move(Err);
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  return Container;
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}
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void DXContainer::PartIterator::updateIteratorImpl(const uint32_t Offset) {
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  StringRef Buffer = Container.Data.getBuffer();
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  const char *Current = Buffer.data() + Offset;
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  // Offsets are validated during parsing, so all offsets in the container are
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  // valid and contain enough readable data to read a header.
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  cantFail(readStruct(Buffer, Current, IteratorState.Part));
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  IteratorState.Data =
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      StringRef(Current + sizeof(dxbc::PartHeader), IteratorState.Part.Size);
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  IteratorState.Offset = Offset;
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}
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Error DirectX::PSVRuntimeInfo::parse(uint16_t ShaderKind) {
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  Triple::EnvironmentType ShaderStage = dxbc::getShaderStage(ShaderKind);
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  const char *Current = Data.begin();
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  if (Error Err = readInteger(Data, Current, Size))
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    return Err;
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  Current += sizeof(uint32_t);
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  StringRef PSVInfoData = Data.substr(sizeof(uint32_t), Size);
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  if (PSVInfoData.size() < Size)
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    return parseFailed(
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        "Pipeline state data extends beyond the bounds of the part");
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  using namespace dxbc::PSV;
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  const uint32_t PSVVersion = getVersion();
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  // Detect the PSVVersion by looking at the size field.
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  if (PSVVersion == 3) {
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    v3::RuntimeInfo Info;
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    if (Error Err = readStruct(PSVInfoData, Current, Info))
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      return Err;
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    if (sys::IsBigEndianHost)
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      Info.swapBytes(ShaderStage);
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    BasicInfo = Info;
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  } else if (PSVVersion == 2) {
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    v2::RuntimeInfo Info;
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    if (Error Err = readStruct(PSVInfoData, Current, Info))
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      return Err;
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    if (sys::IsBigEndianHost)
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      Info.swapBytes(ShaderStage);
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    BasicInfo = Info;
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  } else if (PSVVersion == 1) {
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    v1::RuntimeInfo Info;
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    if (Error Err = readStruct(PSVInfoData, Current, Info))
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      return Err;
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    if (sys::IsBigEndianHost)
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      Info.swapBytes(ShaderStage);
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    BasicInfo = Info;
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  } else if (PSVVersion == 0) {
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    v0::RuntimeInfo Info;
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    if (Error Err = readStruct(PSVInfoData, Current, Info))
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      return Err;
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    if (sys::IsBigEndianHost)
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      Info.swapBytes(ShaderStage);
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    BasicInfo = Info;
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  } else
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    return parseFailed(
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        "Cannot read PSV Runtime Info, unsupported PSV version.");
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  Current += Size;
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  uint32_t ResourceCount = 0;
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  if (Error Err = readInteger(Data, Current, ResourceCount))
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    return Err;
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  Current += sizeof(uint32_t);
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  if (ResourceCount > 0) {
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    if (Error Err = readInteger(Data, Current, Resources.Stride))
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      return Err;
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    Current += sizeof(uint32_t);
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    size_t BindingDataSize = Resources.Stride * ResourceCount;
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    Resources.Data = Data.substr(Current - Data.begin(), BindingDataSize);
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    if (Resources.Data.size() < BindingDataSize)
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      return parseFailed(
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          "Resource binding data extends beyond the bounds of the part");
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    Current += BindingDataSize;
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  } else
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    Resources.Stride = sizeof(v2::ResourceBindInfo);
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  // PSV version 0 ends after the resource bindings.
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  if (PSVVersion == 0)
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    return Error::success();
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  // String table starts at a 4-byte offset.
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  Current = reinterpret_cast<const char *>(
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      alignTo<4>(reinterpret_cast<uintptr_t>(Current)));
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  uint32_t StringTableSize = 0;
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  if (Error Err = readInteger(Data, Current, StringTableSize))
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    return Err;
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  if (StringTableSize % 4 != 0)
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    return parseFailed("String table misaligned");
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  Current += sizeof(uint32_t);
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  StringTable = StringRef(Current, StringTableSize);
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  Current += StringTableSize;
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  uint32_t SemanticIndexTableSize = 0;
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  if (Error Err = readInteger(Data, Current, SemanticIndexTableSize))
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    return Err;
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  Current += sizeof(uint32_t);
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  SemanticIndexTable.reserve(SemanticIndexTableSize);
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  for (uint32_t I = 0; I < SemanticIndexTableSize; ++I) {
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    uint32_t Index = 0;
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    if (Error Err = readInteger(Data, Current, Index))
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      return Err;
333
    Current += sizeof(uint32_t);
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    SemanticIndexTable.push_back(Index);
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  }
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  uint8_t InputCount = getSigInputCount();
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  uint8_t OutputCount = getSigOutputCount();
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  uint8_t PatchOrPrimCount = getSigPatchOrPrimCount();
340

341
  uint32_t ElementCount = InputCount + OutputCount + PatchOrPrimCount;
342

343
  if (ElementCount > 0) {
344
    if (Error Err = readInteger(Data, Current, SigInputElements.Stride))
345
      return Err;
346
    Current += sizeof(uint32_t);
347
    // Assign the stride to all the arrays.
348
    SigOutputElements.Stride = SigPatchOrPrimElements.Stride =
349
        SigInputElements.Stride;
350

351
    if (Data.end() - Current <
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        (ptrdiff_t)(ElementCount * SigInputElements.Stride))
353
      return parseFailed(
354
          "Signature elements extend beyond the size of the part");
355

356
    size_t InputSize = SigInputElements.Stride * InputCount;
357
    SigInputElements.Data = Data.substr(Current - Data.begin(), InputSize);
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    Current += InputSize;
359

360
    size_t OutputSize = SigOutputElements.Stride * OutputCount;
361
    SigOutputElements.Data = Data.substr(Current - Data.begin(), OutputSize);
362
    Current += OutputSize;
363

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    size_t PSize = SigPatchOrPrimElements.Stride * PatchOrPrimCount;
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    SigPatchOrPrimElements.Data = Data.substr(Current - Data.begin(), PSize);
366
    Current += PSize;
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  }
368

369
  ArrayRef<uint8_t> OutputVectorCounts = getOutputVectorCounts();
370
  uint8_t PatchConstOrPrimVectorCount = getPatchConstOrPrimVectorCount();
371
  uint8_t InputVectorCount = getInputVectorCount();
372

373
  auto maskDwordSize = [](uint8_t Vector) {
374
    return (static_cast<uint32_t>(Vector) + 7) >> 3;
375
  };
376

377
  auto mapTableSize = [maskDwordSize](uint8_t X, uint8_t Y) {
378
    return maskDwordSize(Y) * X * 4;
379
  };
380

381
  if (usesViewID()) {
382
    for (uint32_t I = 0; I < OutputVectorCounts.size(); ++I) {
383
      // The vector mask is one bit per component and 4 components per vector.
384
      // We can compute the number of dwords required by rounding up to the next
385
      // multiple of 8.
386
      uint32_t NumDwords =
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          maskDwordSize(static_cast<uint32_t>(OutputVectorCounts[I]));
388
      size_t NumBytes = NumDwords * sizeof(uint32_t);
389
      OutputVectorMasks[I].Data = Data.substr(Current - Data.begin(), NumBytes);
390
      Current += NumBytes;
391
    }
392

393
    if (ShaderStage == Triple::Hull && PatchConstOrPrimVectorCount > 0) {
394
      uint32_t NumDwords = maskDwordSize(PatchConstOrPrimVectorCount);
395
      size_t NumBytes = NumDwords * sizeof(uint32_t);
396
      PatchOrPrimMasks.Data = Data.substr(Current - Data.begin(), NumBytes);
397
      Current += NumBytes;
398
    }
399
  }
400

401
  // Input/Output mapping table
402
  for (uint32_t I = 0; I < OutputVectorCounts.size(); ++I) {
403
    if (InputVectorCount == 0 || OutputVectorCounts[I] == 0)
404
      continue;
405
    uint32_t NumDwords = mapTableSize(InputVectorCount, OutputVectorCounts[I]);
406
    size_t NumBytes = NumDwords * sizeof(uint32_t);
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    InputOutputMap[I].Data = Data.substr(Current - Data.begin(), NumBytes);
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    Current += NumBytes;
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  }
410

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  // Hull shader: Input/Patch mapping table
412
  if (ShaderStage == Triple::Hull && PatchConstOrPrimVectorCount > 0 &&
413
      InputVectorCount > 0) {
414
    uint32_t NumDwords =
415
        mapTableSize(InputVectorCount, PatchConstOrPrimVectorCount);
416
    size_t NumBytes = NumDwords * sizeof(uint32_t);
417
    InputPatchMap.Data = Data.substr(Current - Data.begin(), NumBytes);
418
    Current += NumBytes;
419
  }
420

421
  // Domain Shader: Patch/Output mapping table
422
  if (ShaderStage == Triple::Domain && PatchConstOrPrimVectorCount > 0 &&
423
      OutputVectorCounts[0] > 0) {
424
    uint32_t NumDwords =
425
        mapTableSize(PatchConstOrPrimVectorCount, OutputVectorCounts[0]);
426
    size_t NumBytes = NumDwords * sizeof(uint32_t);
427
    PatchOutputMap.Data = Data.substr(Current - Data.begin(), NumBytes);
428
    Current += NumBytes;
429
  }
430

431
  return Error::success();
432
}
433

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uint8_t DirectX::PSVRuntimeInfo::getSigInputCount() const {
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  if (const auto *P = std::get_if<dxbc::PSV::v3::RuntimeInfo>(&BasicInfo))
436
    return P->SigInputElements;
437
  if (const auto *P = std::get_if<dxbc::PSV::v2::RuntimeInfo>(&BasicInfo))
438
    return P->SigInputElements;
439
  if (const auto *P = std::get_if<dxbc::PSV::v1::RuntimeInfo>(&BasicInfo))
440
    return P->SigInputElements;
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  return 0;
442
}
443

444
uint8_t DirectX::PSVRuntimeInfo::getSigOutputCount() const {
445
  if (const auto *P = std::get_if<dxbc::PSV::v3::RuntimeInfo>(&BasicInfo))
446
    return P->SigOutputElements;
447
  if (const auto *P = std::get_if<dxbc::PSV::v2::RuntimeInfo>(&BasicInfo))
448
    return P->SigOutputElements;
449
  if (const auto *P = std::get_if<dxbc::PSV::v1::RuntimeInfo>(&BasicInfo))
450
    return P->SigOutputElements;
451
  return 0;
452
}
453

454
uint8_t DirectX::PSVRuntimeInfo::getSigPatchOrPrimCount() const {
455
  if (const auto *P = std::get_if<dxbc::PSV::v3::RuntimeInfo>(&BasicInfo))
456
    return P->SigPatchOrPrimElements;
457
  if (const auto *P = std::get_if<dxbc::PSV::v2::RuntimeInfo>(&BasicInfo))
458
    return P->SigPatchOrPrimElements;
459
  if (const auto *P = std::get_if<dxbc::PSV::v1::RuntimeInfo>(&BasicInfo))
460
    return P->SigPatchOrPrimElements;
461
  return 0;
462
}
463

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