text: //===--- ARMAttributeParser.cpp - ARM Attribute Information Printer -------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  #include "ARMAttributeParser.h"
  #include "StreamWriter.h"
  #include "llvm/ADT/STLExtras.h"
  #include "llvm/ADT/StringExtras.h"
  #include "llvm/Support/LEB128.h"
  
  using namespace llvm;
  using namespace llvm::ARMBuildAttrs;
  
  
  static const EnumEntry<unsigned> TagNames[] = {
    { "Tag_File", ARMBuildAttrs::File },
    { "Tag_Section", ARMBuildAttrs::Section },
    { "Tag_Symbol", ARMBuildAttrs::Symbol },
  };
  
  namespace llvm {
  #define ATTRIBUTE_HANDLER(Attr_)                                                \
    { ARMBuildAttrs::Attr_, &ARMAttributeParser::Attr_ }
  
  const ARMAttributeParser::DisplayHandler
  ARMAttributeParser::DisplayRoutines[] = {
    { ARMBuildAttrs::CPU_raw_name, &ARMAttributeParser::StringAttribute, },
    { ARMBuildAttrs::CPU_name, &ARMAttributeParser::StringAttribute },
    ATTRIBUTE_HANDLER(CPU_arch),
    ATTRIBUTE_HANDLER(CPU_arch_profile),
    ATTRIBUTE_HANDLER(ARM_ISA_use),
    ATTRIBUTE_HANDLER(THUMB_ISA_use),
    ATTRIBUTE_HANDLER(FP_arch),
    ATTRIBUTE_HANDLER(WMMX_arch),
    ATTRIBUTE_HANDLER(Advanced_SIMD_arch),
    ATTRIBUTE_HANDLER(PCS_config),
    ATTRIBUTE_HANDLER(ABI_PCS_R9_use),
    ATTRIBUTE_HANDLER(ABI_PCS_RW_data),
    ATTRIBUTE_HANDLER(ABI_PCS_RO_data),
    ATTRIBUTE_HANDLER(ABI_PCS_GOT_use),
    ATTRIBUTE_HANDLER(ABI_PCS_wchar_t),
    ATTRIBUTE_HANDLER(ABI_FP_rounding),
    ATTRIBUTE_HANDLER(ABI_FP_denormal),
    ATTRIBUTE_HANDLER(ABI_FP_exceptions),
    ATTRIBUTE_HANDLER(ABI_FP_user_exceptions),
    ATTRIBUTE_HANDLER(ABI_FP_number_model),
    ATTRIBUTE_HANDLER(ABI_align_needed),
    ATTRIBUTE_HANDLER(ABI_align_preserved),
    ATTRIBUTE_HANDLER(ABI_enum_size),
    ATTRIBUTE_HANDLER(ABI_HardFP_use),
    ATTRIBUTE_HANDLER(ABI_VFP_args),
    ATTRIBUTE_HANDLER(ABI_WMMX_args),
    ATTRIBUTE_HANDLER(ABI_optimization_goals),
    ATTRIBUTE_HANDLER(ABI_FP_optimization_goals),
    ATTRIBUTE_HANDLER(compatibility),
    ATTRIBUTE_HANDLER(CPU_unaligned_access),
    ATTRIBUTE_HANDLER(FP_HP_extension),
    ATTRIBUTE_HANDLER(ABI_FP_16bit_format),
    ATTRIBUTE_HANDLER(MPextension_use),
    ATTRIBUTE_HANDLER(DIV_use),
    ATTRIBUTE_HANDLER(DSP_extension),
    ATTRIBUTE_HANDLER(T2EE_use),
    ATTRIBUTE_HANDLER(Virtualization_use),
    ATTRIBUTE_HANDLER(nodefaults)
  };
  
  #undef ATTRIBUTE_HANDLER
  
  uint64_t ARMAttributeParser::ParseInteger(const uint8_t *Data,
                                            uint32_t &Offset) {
    unsigned Length;
    uint64_t Value = decodeULEB128(Data + Offset, &Length);
    Offset = Offset + Length;
    return Value;
  }
  
  StringRef ARMAttributeParser::ParseString(const uint8_t *Data,
                                            uint32_t &Offset) {
    const char *String = reinterpret_cast<const char*>(Data + Offset);
    size_t Length = std::strlen(String);
    Offset = Offset + Length + 1;
    return StringRef(String, Length);
  }
  
  void ARMAttributeParser::IntegerAttribute(AttrType Tag, const uint8_t *Data,
                                            uint32_t &Offset) {
    SW.printNumber(ARMBuildAttrs::AttrTypeAsString(Tag),
                   ParseInteger(Data, Offset));
  }
  
  void ARMAttributeParser::StringAttribute(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
    StringRef TagName = ARMBuildAttrs::AttrTypeAsString(Tag, /*TagPrefix*/false);
  
    DictScope AS(SW, "Attribute");
    SW.printNumber("Tag", Tag);
    if (!TagName.empty())
      SW.printString("TagName", TagName);
    SW.printString("Value", ParseString(Data, Offset));
  }
  
  void ARMAttributeParser::PrintAttribute(unsigned Tag, unsigned Value,
                                          StringRef ValueDesc) {
    StringRef TagName = ARMBuildAttrs::AttrTypeAsString(Tag, /*TagPrefix*/false);
  
    DictScope AS(SW, "Attribute");
    SW.printNumber("Tag", Tag);
    SW.printNumber("Value", Value);
    if (!TagName.empty())
      SW.printString("TagName", TagName);
    if (!ValueDesc.empty())
      SW.printString("Description", ValueDesc);
  }
  
  void ARMAttributeParser::CPU_arch(AttrType Tag, const uint8_t *Data,
                                    uint32_t &Offset) {
    static const char *const Strings[] = {
      "Pre-v4", "ARM v4", "ARM v4T", "ARM v5T", "ARM v5TE", "ARM v5TEJ", "ARM v6",
      "ARM v6KZ", "ARM v6T2", "ARM v6K", "ARM v7", "ARM v6-M", "ARM v6S-M",
      "ARM v7E-M", "ARM v8"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::CPU_arch_profile(AttrType Tag, const uint8_t *Data,
                                            uint32_t &Offset) {
    uint64_t Encoded = ParseInteger(Data, Offset);
  
    StringRef Profile;
    switch (Encoded) {
    default:  Profile = "Unknown"; break;
    case 'A': Profile = "Application"; break;
    case 'R': Profile = "Real-time"; break;
    case 'M': Profile = "Microcontroller"; break;
    case 'S': Profile = "Classic"; break;
    case 0: Profile = "None"; break;
    }
  
    PrintAttribute(Tag, Encoded, Profile);
  }
  
  void ARMAttributeParser::ARM_ISA_use(AttrType Tag, const uint8_t *Data,
                                       uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "Permitted" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::THUMB_ISA_use(AttrType Tag, const uint8_t *Data,
                                         uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "Thumb-1", "Thumb-2" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::FP_arch(AttrType Tag, const uint8_t *Data,
                                   uint32_t &Offset) {
    static const char *const Strings[] = {
      "Not Permitted", "VFPv1", "VFPv2", "VFPv3", "VFPv3-D16", "VFPv4",
      "VFPv4-D16", "ARMv8-a FP", "ARMv8-a FP-D16"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::WMMX_arch(AttrType Tag, const uint8_t *Data,
                                     uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "WMMXv1", "WMMXv2" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::Advanced_SIMD_arch(AttrType Tag, const uint8_t *Data,
                                              uint32_t &Offset) {
    static const char *const Strings[] = {
      "Not Permitted", "NEONv1", "NEONv2+FMA", "ARMv8-a NEON", "ARMv8.1-a NEON"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::PCS_config(AttrType Tag, const uint8_t *Data,
                                      uint32_t &Offset) {
    static const char *const Strings[] = {
      "None", "Bare Platform", "Linux Application", "Linux DSO", "Palm OS 2004",
      "Reserved (Palm OS)", "Symbian OS 2004", "Reserved (Symbian OS)"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_PCS_R9_use(AttrType Tag, const uint8_t *Data,
                                          uint32_t &Offset) {
    static const char *const Strings[] = { "v6", "Static Base", "TLS", "Unused" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_PCS_RW_data(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
    static const char *const Strings[] = {
      "Absolute", "PC-relative", "SB-relative", "Not Permitted"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_PCS_RO_data(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
    static const char *const Strings[] = {
      "Absolute", "PC-relative", "Not Permitted"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_PCS_GOT_use(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
    static const char *const Strings[] = {
      "Not Permitted", "Direct", "GOT-Indirect"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_PCS_wchar_t(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
    static const char *const Strings[] = {
      "Not Permitted", "Unknown", "2-byte", "Unknown", "4-byte"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_FP_rounding(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
    static const char *const Strings[] = { "IEEE-754", "Runtime" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_FP_denormal(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
    static const char *const Strings[] = {
      "Unsupported", "IEEE-754", "Sign Only"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_FP_exceptions(AttrType Tag, const uint8_t *Data,
                                             uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "IEEE-754" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_FP_user_exceptions(AttrType Tag,
                                                  const uint8_t *Data,
                                                  uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "IEEE-754" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_FP_number_model(AttrType Tag, const uint8_t *Data,
                                               uint32_t &Offset) {
    static const char *const Strings[] = {
      "Not Permitted", "Finite Only", "RTABI", "IEEE-754"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_align_needed(AttrType Tag, const uint8_t *Data,
                                            uint32_t &Offset) {
    static const char *const Strings[] = {
      "Not Permitted", "8-byte alignment", "4-byte alignment", "Reserved"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
  
    std::string Description;
    if (Value < array_lengthof(Strings))
      Description = std::string(Strings[Value]);
    else if (Value <= 12)
      Description = std::string("8-byte alignment, ") + utostr(1 << Value)
                  + std::string("-byte extended alignment");
    else
      Description = "Invalid";
  
    PrintAttribute(Tag, Value, Description);
  }
  
  void ARMAttributeParser::ABI_align_preserved(AttrType Tag, const uint8_t *Data,
                                               uint32_t &Offset) {
    static const char *const Strings[] = {
      "Not Required", "8-byte data alignment", "8-byte data and code alignment",
      "Reserved"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
  
    std::string Description;
    if (Value < array_lengthof(Strings))
      Description = std::string(Strings[Value]);
    else if (Value <= 12)
      Description = std::string("8-byte stack alignment, ") + utostr(1 << Value)
                  + std::string("-byte data alignment");
    else
      Description = "Invalid";
  
    PrintAttribute(Tag, Value, Description);
  }
  
  void ARMAttributeParser::ABI_enum_size(AttrType Tag, const uint8_t *Data,
                                         uint32_t &Offset) {
    static const char *const Strings[] = {
      "Not Permitted", "Packed", "Int32", "External Int32"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_HardFP_use(AttrType Tag, const uint8_t *Data,
                                          uint32_t &Offset) {
    static const char *const Strings[] = {
      "Tag_FP_arch", "Single-Precision", "Reserved", "Tag_FP_arch (deprecated)"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_VFP_args(AttrType Tag, const uint8_t *Data,
                                        uint32_t &Offset) {
    static const char *const Strings[] = {
      "AAPCS", "AAPCS VFP", "Custom", "Not Permitted"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_WMMX_args(AttrType Tag, const uint8_t *Data,
                                         uint32_t &Offset) {
    static const char *const Strings[] = { "AAPCS", "iWMMX", "Custom" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_optimization_goals(AttrType Tag,
                                                  const uint8_t *Data,
                                                  uint32_t &Offset) {
    static const char *const Strings[] = {
      "None", "Speed", "Aggressive Speed", "Size", "Aggressive Size", "Debugging",
      "Best Debugging"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_FP_optimization_goals(AttrType Tag,
                                                     const uint8_t *Data,
                                                     uint32_t &Offset) {
    static const char *const Strings[] = {
      "None", "Speed", "Aggressive Speed", "Size", "Aggressive Size", "Accuracy",
      "Best Accuracy"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::compatibility(AttrType Tag, const uint8_t *Data,
                                         uint32_t &Offset) {
    uint64_t Integer = ParseInteger(Data, Offset);
    StringRef String = ParseString(Data, Offset);
  
    DictScope AS(SW, "Attribute");
    SW.printNumber("Tag", Tag);
    SW.startLine() << "Value: " << Integer << ", " << String << '\n';
    SW.printString("TagName", AttrTypeAsString(Tag, /*TagPrefix*/false));
    switch (Integer) {
    case 0:
      SW.printString("Description", StringRef("No Specific Requirements"));
      break;
    case 1:
      SW.printString("Description", StringRef("AEABI Conformant"));
      break;
    default:
      SW.printString("Description", StringRef("AEABI Non-Conformant"));
      break;
    }
  }
  
  void ARMAttributeParser::CPU_unaligned_access(AttrType Tag, const uint8_t *Data,
                                                uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "v6-style" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::FP_HP_extension(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
    static const char *const Strings[] = { "If Available", "Permitted" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::ABI_FP_16bit_format(AttrType Tag, const uint8_t *Data,
                                               uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "IEEE-754", "VFPv3" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::MPextension_use(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "Permitted" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::DIV_use(AttrType Tag, const uint8_t *Data,
                                   uint32_t &Offset) {
    static const char *const Strings[] = {
      "If Available", "Not Permitted", "Permitted"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::DSP_extension(AttrType Tag, const uint8_t *Data,
                                         uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "Permitted" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::T2EE_use(AttrType Tag, const uint8_t *Data,
                                    uint32_t &Offset) {
    static const char *const Strings[] = { "Not Permitted", "Permitted" };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::Virtualization_use(AttrType Tag, const uint8_t *Data,
                                              uint32_t &Offset) {
    static const char *const Strings[] = {
      "Not Permitted", "TrustZone", "Virtualization Extensions",
      "TrustZone + Virtualization Extensions"
    };
  
    uint64_t Value = ParseInteger(Data, Offset);
    StringRef ValueDesc =
      (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
    PrintAttribute(Tag, Value, ValueDesc);
  }
  
  void ARMAttributeParser::nodefaults(AttrType Tag, const uint8_t *Data,
                                      uint32_t &Offset) {
    uint64_t Value = ParseInteger(Data, Offset);
    PrintAttribute(Tag, Value, "Unspecified Tags UNDEFINED");
  }
  
  void ARMAttributeParser::ParseIndexList(const uint8_t *Data, uint32_t &Offset,
                                          SmallVectorImpl<uint8_t> &IndexList) {
    for (;;) {
      unsigned Length;
      uint64_t Value = decodeULEB128(Data + Offset, &Length);
      Offset = Offset + Length;
      if (Value == 0)
        break;
      IndexList.push_back(Value);
    }
  }
  
  void ARMAttributeParser::ParseAttributeList(const uint8_t *Data,
                                              uint32_t &Offset, uint32_t Length) {
    while (Offset < Length) {
      unsigned Length;
      uint64_t Tag = decodeULEB128(Data + Offset, &Length);
      Offset += Length;
  
      bool Handled = false;
      for (unsigned AHI = 0, AHE = array_lengthof(DisplayRoutines);
           AHI != AHE && !Handled; ++AHI) {
        if (DisplayRoutines[AHI].Attribute == Tag) {
          (this->*DisplayRoutines[AHI].Routine)(ARMBuildAttrs::AttrType(Tag),
                                                Data, Offset);
          Handled = true;
          break;
        }
      }
      if (!Handled) {
        if (Tag < 32) {
          errs() << "unhandled AEABI Tag " << Tag
                 << " (" << ARMBuildAttrs::AttrTypeAsString(Tag) << ")\n";
          continue;
        }
  
        if (Tag % 2 == 0)
          IntegerAttribute(ARMBuildAttrs::AttrType(Tag), Data, Offset);
        else
          StringAttribute(ARMBuildAttrs::AttrType(Tag), Data, Offset);
      }
    }
  }
  
  void ARMAttributeParser::ParseSubsection(const uint8_t *Data, uint32_t Length) {
    uint32_t Offset = sizeof(uint32_t); /* SectionLength */
  
    SW.printNumber("SectionLength", Length);
  
    const char *VendorName = reinterpret_cast<const char*>(Data + Offset);
    size_t VendorNameLength = std::strlen(VendorName);
    SW.printString("Vendor", StringRef(VendorName, VendorNameLength));
    Offset = Offset + VendorNameLength + 1;
  
    if (StringRef(VendorName, VendorNameLength).lower() != "aeabi")
      return;
  
    while (Offset < Length) {
      /// Tag_File | Tag_Section | Tag_Symbol   uleb128:byte-size
      uint8_t Tag = Data[Offset];
      SW.printEnum("Tag", Tag, makeArrayRef(TagNames));
      Offset = Offset + sizeof(Tag);
  
      uint32_t Size =
        *reinterpret_cast<const support::ulittle32_t*>(Data + Offset);
      SW.printNumber("Size", Size);
      Offset = Offset + sizeof(Size);
  
      if (Size > Length) {
        errs() << "subsection length greater than section length\n";
        return;
      }
  
      StringRef ScopeName, IndexName;
      SmallVector<uint8_t, 8> Indicies;
      switch (Tag) {
      case ARMBuildAttrs::File:
        ScopeName = "FileAttributes";
        break;
      case ARMBuildAttrs::Section:
        ScopeName = "SectionAttributes";
        IndexName = "Sections";
        ParseIndexList(Data, Offset, Indicies);
        break;
      case ARMBuildAttrs::Symbol:
        ScopeName = "SymbolAttributes";
        IndexName = "Symbols";
        ParseIndexList(Data, Offset, Indicies);
        break;
      default:
        errs() << "unrecognised tag: 0x" << utohexstr(Tag) << '\n';
        return;
      }
  
      DictScope ASS(SW, ScopeName);
  
      if (!Indicies.empty())
        SW.printList(IndexName, Indicies);
  
      ParseAttributeList(Data, Offset, Length);
    }
  }
  
  void ARMAttributeParser::Parse(ArrayRef<uint8_t> Section) {
    size_t Offset = 1;
    unsigned SectionNumber = 0;
  
    while (Offset < Section.size()) {
      uint32_t SectionLength =
        *reinterpret_cast<const support::ulittle32_t*>(Section.data() + Offset);
  
      SW.startLine() << "Section " << ++SectionNumber << " {\n";
      SW.indent();
  
      ParseSubsection(Section.data() + Offset, SectionLength);
      Offset = Offset + SectionLength;
  
      SW.unindent();
      SW.startLine() << "}\n";
    }
  }
  }
  
  