Method parseAttributeBlock

src/lib/Bitcode/Reader/BitcodeReader.cpp:1247–1301

}

Error BitcodeReader::parseAttributeBlock() {
  if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID))
    return error("Invalid record");

  if (!MAttributes.empty())
    return error("Invalid multiple blocks");

  SmallVector<uint64_t, 64> Record;

  SmallVector<AttributeList, 8> Attrs;

  // Read all the records.
  while (true) {
    BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

    switch (Entry.Kind) {
    case BitstreamEntry::SubBlock: // Handled for us already.
    case BitstreamEntry::Error:
      return error("Malformed block");
    case BitstreamEntry::EndBlock:
      return Error::success();
    case BitstreamEntry::Record:
      // The interesting case.
      break;
    }

    // Read a record.
    Record.clear();
    switch (Stream.readRecord(Entry.ID, Record)) {
    default:  // Default behavior: ignore.
      break;
    case bitc::PARAMATTR_CODE_ENTRY_OLD: // ENTRY: [paramidx0, attr0, ...]
      // FIXME: Remove in 4.0.
      if (Record.size() & 1)
        return error("Invalid record");

      for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
        AttrBuilder B;
        decodeLLVMAttributesForBitcode(B, Record[i+1]);
        Attrs.push_back(AttributeList::get(Context, Record[i], B));
      }

      MAttributes.push_back(AttributeList::get(Context, Attrs));
      Attrs.clear();
      break;
    case bitc::PARAMATTR_CODE_ENTRY: // ENTRY: [attrgrp0, attrgrp1, ...]
      for (unsigned i = 0, e = Record.size(); i != e; ++i)
        Attrs.push_back(MAttributeGroups[Record[i]]);

      MAttributes.push_back(AttributeList::get(Context, Attrs));
      Attrs.clear();
      break;
    }
  }
}

// Returns Attribute::None on unrecognized codes.
static Attribute::AttrKind getAttrFromCode(uint64_t Code) {