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 //===- ELFYAML.h - ELF YAMLIO implementation --------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// This file declares classes for handling the YAML representation
 /// of ELF.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_OBJECTYAML_ELFYAML_H
 #define LLVM_OBJECTYAML_ELFYAML_H
 
 #include "llvm/ADT/StringRef.h"
 #include "llvm/BinaryFormat/ELF.h"
 #include "llvm/Object/ELFTypes.h"
 #include "llvm/ObjectYAML/DWARFYAML.h"
 #include "llvm/ObjectYAML/YAML.h"
 #include "llvm/Support/YAMLTraits.h"
 #include <cstdint>
 #include <memory>
 #include <optional>
 #include <vector>
 
 namespace llvm {
 namespace ELFYAML {
 
 StringRef dropUniqueSuffix(StringRef S);
 std::string appendUniqueSuffix(StringRef Name, const Twine& Msg);
 
 // These types are invariant across 32/64-bit ELF, so for simplicity just
 // directly give them their exact sizes. We don't need to worry about
 // endianness because these are just the types in the YAMLIO structures,
 // and are appropriately converted to the necessary endianness when
 // reading/generating binary object files.
 // The naming of these types is intended to be ELF_PREFIX, where PREFIX is
 // the common prefix of the respective constants. E.g. ELF_EM corresponds
 // to the `e_machine` constants, like `EM_X86_64`.
 // In the future, these would probably be better suited by C++11 enum
 // class's with appropriate fixed underlying type.
 LLVM_YAML_STRONG_TYPEDEF(uint16_t, ELF_ET)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, ELF_PT)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, ELF_EM)
 LLVM_YAML_STRONG_TYPEDEF(uint8_t, ELF_ELFCLASS)
 LLVM_YAML_STRONG_TYPEDEF(uint8_t, ELF_ELFDATA)
 LLVM_YAML_STRONG_TYPEDEF(uint8_t, ELF_ELFOSABI)
 // Just use 64, since it can hold 32-bit values too.
 LLVM_YAML_STRONG_TYPEDEF(uint64_t, ELF_EF)
 // Just use 64, since it can hold 32-bit values too.
 LLVM_YAML_STRONG_TYPEDEF(uint64_t, ELF_DYNTAG)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, ELF_PF)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, ELF_SHT)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, ELF_REL)
 LLVM_YAML_STRONG_TYPEDEF(uint8_t, ELF_RSS)
 // Just use 64, since it can hold 32-bit values too.
 LLVM_YAML_STRONG_TYPEDEF(uint64_t, ELF_SHF)
 LLVM_YAML_STRONG_TYPEDEF(uint16_t, ELF_SHN)
 LLVM_YAML_STRONG_TYPEDEF(uint8_t, ELF_STB)
 LLVM_YAML_STRONG_TYPEDEF(uint8_t, ELF_STT)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, ELF_NT)
 
 LLVM_YAML_STRONG_TYPEDEF(uint8_t, MIPS_AFL_REG)
 LLVM_YAML_STRONG_TYPEDEF(uint8_t, MIPS_ABI_FP)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, MIPS_AFL_EXT)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, MIPS_AFL_ASE)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, MIPS_AFL_FLAGS1)
 LLVM_YAML_STRONG_TYPEDEF(uint32_t, MIPS_ISA)
 
 LLVM_YAML_STRONG_TYPEDEF(StringRef, YAMLFlowString)
 LLVM_YAML_STRONG_TYPEDEF(int64_t, YAMLIntUInt)
 
 template <class ELFT>
 unsigned getDefaultShEntSize(unsigned EMachine, ELF_SHT SecType,
                              StringRef SecName) {
   if (EMachine == ELF::EM_MIPS && SecType == ELF::SHT_MIPS_ABIFLAGS)
     return sizeof(object::Elf_Mips_ABIFlags<ELFT>);
 
   switch (SecType) {
   case ELF::SHT_SYMTAB:
   case ELF::SHT_DYNSYM:
     return sizeof(typename ELFT::Sym);
   case ELF::SHT_GROUP:
     return sizeof(typename ELFT::Word);
   case ELF::SHT_REL:
     return sizeof(typename ELFT::Rel);
   case ELF::SHT_RELA:
     return sizeof(typename ELFT::Rela);
   case ELF::SHT_RELR:
     return sizeof(typename ELFT::Relr);
   case ELF::SHT_DYNAMIC:
     return sizeof(typename ELFT::Dyn);
   case ELF::SHT_HASH:
     return sizeof(typename ELFT::Word);
   case ELF::SHT_SYMTAB_SHNDX:
     return sizeof(typename ELFT::Word);
   case ELF::SHT_GNU_versym:
     return sizeof(typename ELFT::Half);
   case ELF::SHT_LLVM_CALL_GRAPH_PROFILE:
     return sizeof(object::Elf_CGProfile_Impl<ELFT>);
   default:
     if (SecName == ".debug_str")
       return 1;
     return 0;
   }
 }
 
 // For now, hardcode 64 bits everywhere that 32 or 64 would be needed
 // since 64-bit can hold 32-bit values too.
 struct FileHeader {
   ELF_ELFCLASS Class;
   ELF_ELFDATA Data;
   ELF_ELFOSABI OSABI;
   llvm::yaml::Hex8 ABIVersion;
   ELF_ET Type;
   std::optional<ELF_EM> Machine;
   ELF_EF Flags;
   llvm::yaml::Hex64 Entry;
   std::optional<StringRef> SectionHeaderStringTable;
 
   std::optional<llvm::yaml::Hex64> EPhOff;
   std::optional<llvm::yaml::Hex16> EPhEntSize;
   std::optional<llvm::yaml::Hex16> EPhNum;
   std::optional<llvm::yaml::Hex16> EShEntSize;
   std::optional<llvm::yaml::Hex64> EShOff;
   std::optional<llvm::yaml::Hex16> EShNum;
   std::optional<llvm::yaml::Hex16> EShStrNdx;
 };
 
 struct SectionHeader {
   StringRef Name;
 };
 
 struct Symbol {
   StringRef Name;
   ELF_STT Type;
   std::optional<StringRef> Section;
   std::optional<ELF_SHN> Index;
   ELF_STB Binding;
   std::optional<llvm::yaml::Hex64> Value;
   std::optional<llvm::yaml::Hex64> Size;
   std::optional<uint8_t> Other;
 
   std::optional<uint32_t> StName;
 };
 
 struct SectionOrType {
   StringRef sectionNameOrType;
 };
 
 struct DynamicEntry {
   ELF_DYNTAG Tag;
   llvm::yaml::Hex64 Val;
 };
 
 struct BBAddrMapEntry {
   struct BBEntry {
     uint32_t ID;
     llvm::yaml::Hex64 AddressOffset;
     llvm::yaml::Hex64 Size;
     llvm::yaml::Hex64 Metadata;
   };
   uint8_t Version;
   llvm::yaml::Hex8 Feature;
 
   struct BBRangeEntry {
     llvm::yaml::Hex64 BaseAddress;
     std::optional<uint64_t> NumBlocks;
     std::optional<std::vector<BBEntry>> BBEntries;
   };
 
   std::optional<uint64_t> NumBBRanges;
   std::optional<std::vector<BBRangeEntry>> BBRanges;
 
   llvm::yaml::Hex64 getFunctionAddress() const {
     if (!BBRanges || BBRanges->empty())
       return 0;
     return BBRanges->front().BaseAddress;
   }
 };
 
 struct PGOAnalysisMapEntry {
   struct PGOBBEntry {
     struct SuccessorEntry {
       uint32_t ID;
       llvm::yaml::Hex32 BrProb;
     };
     std::optional<uint64_t> BBFreq;
     std::optional<std::vector<SuccessorEntry>> Successors;
   };
   std::optional<uint64_t> FuncEntryCount;
   std::optional<std::vector<PGOBBEntry>> PGOBBEntries;
 };
 
 struct StackSizeEntry {
   llvm::yaml::Hex64 Address;
   llvm::yaml::Hex64 Size;
 };
 
 struct NoteEntry {
   StringRef Name;
   yaml::BinaryRef Desc;
   ELF_NT Type;
 };
 
 struct Chunk {
   enum class ChunkKind {
     Dynamic,
     Group,
     RawContent,
     Relocation,
     Relr,
     NoBits,
     Note,
     Hash,
     GnuHash,
     Verdef,
     Verneed,
     StackSizes,
     SymtabShndxSection,
     Symver,
     ARMIndexTable,
     MipsABIFlags,
     Addrsig,
     LinkerOptions,
     DependentLibraries,
     CallGraphProfile,
     BBAddrMap,
 
     // Special chunks.
     SpecialChunksStart,
     Fill = SpecialChunksStart,
     SectionHeaderTable,
   };
 
   ChunkKind Kind;
   StringRef Name;
   std::optional<llvm::yaml::Hex64> Offset;
 
   // Usually chunks are not created implicitly, but rather loaded from YAML.
   // This flag is used to signal whether this is the case or not.
   bool IsImplicit;
 
   Chunk(ChunkKind K, bool Implicit) : Kind(K), IsImplicit(Implicit) {}
   virtual ~Chunk();
 };
 
 struct Section : public Chunk {
   ELF_SHT Type;
   std::optional<ELF_SHF> Flags;
   std::optional<llvm::yaml::Hex64> Address;
   std::optional<StringRef> Link;
   llvm::yaml::Hex64 AddressAlign;
   std::optional<llvm::yaml::Hex64> EntSize;
 
   std::optional<yaml::BinaryRef> Content;
   std::optional<llvm::yaml::Hex64> Size;
 
   // Holds the original section index.
   unsigned OriginalSecNdx;
 
   Section(ChunkKind Kind, bool IsImplicit = false) : Chunk(Kind, IsImplicit) {}
 
   static bool classof(const Chunk *S) {
     return S->Kind < ChunkKind::SpecialChunksStart;
   }
 
   // Some derived sections might have their own special entries. This method
   // returns a vector of <entry name, is used> pairs. It is used for section
   // validation.
   virtual std::vector<std::pair<StringRef, bool>> getEntries() const {
     return {};
   };
 
   // The following members are used to override section fields which is
   // useful for creating invalid objects.
 
   // This can be used to override the sh_addralign field.
   std::optional<llvm::yaml::Hex64> ShAddrAlign;
 
   // This can be used to override the offset stored in the sh_name field.
   // It does not affect the name stored in the string table.
   std::optional<llvm::yaml::Hex64> ShName;
 
   // This can be used to override the sh_offset field. It does not place the
   // section data at the offset specified.
   std::optional<llvm::yaml::Hex64> ShOffset;
 
   // This can be used to override the sh_size field. It does not affect the
   // content written.
   std::optional<llvm::yaml::Hex64> ShSize;
 
   // This can be used to override the sh_flags field.
   std::optional<llvm::yaml::Hex64> ShFlags;
 
   // This can be used to override the sh_type field. It is useful when we
   // want to use specific YAML keys for a section of a particular type to
   // describe the content, but still want to have a different final type
   // for the section.
   std::optional<ELF_SHT> ShType;
 };
 
 // Fill is a block of data which is placed outside of sections. It is
 // not present in the sections header table, but it might affect the output file
 // size and program headers produced.
 struct Fill : Chunk {
   std::optional<yaml::BinaryRef> Pattern;
   llvm::yaml::Hex64 Size;
 
   Fill() : Chunk(ChunkKind::Fill, /*Implicit=*/false) {}
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Fill; }
 };
 
 struct SectionHeaderTable : Chunk {
   SectionHeaderTable(bool IsImplicit)
       : Chunk(ChunkKind::SectionHeaderTable, IsImplicit) {}
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::SectionHeaderTable;
   }
 
   std::optional<std::vector<SectionHeader>> Sections;
   std::optional<std::vector<SectionHeader>> Excluded;
   std::optional<bool> NoHeaders;
 
   size_t getNumHeaders(size_t SectionsNum) const {
     if (IsImplicit || isDefault())
       return SectionsNum;
     if (NoHeaders)
       return (*NoHeaders) ? 0 : SectionsNum;
     return (Sections ? Sections->size() : 0) + /*Null section*/ 1;
   }
 
   bool isDefault() const { return !Sections && !Excluded && !NoHeaders; }
 
   static constexpr StringRef TypeStr = "SectionHeaderTable";
 };
 
 struct BBAddrMapSection : Section {
   std::optional<std::vector<BBAddrMapEntry>> Entries;
   std::optional<std::vector<PGOAnalysisMapEntry>> PGOAnalyses;
 
   BBAddrMapSection() : Section(ChunkKind::BBAddrMap) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Entries", Entries.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::BBAddrMap;
   }
 };
 
 struct StackSizesSection : Section {
   std::optional<std::vector<StackSizeEntry>> Entries;
 
   StackSizesSection() : Section(ChunkKind::StackSizes) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Entries", Entries.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::StackSizes;
   }
 
   static bool nameMatches(StringRef Name) {
     return Name == ".stack_sizes";
   }
 };
 
 struct DynamicSection : Section {
   std::optional<std::vector<DynamicEntry>> Entries;
 
   DynamicSection() : Section(ChunkKind::Dynamic) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Entries", Entries.has_value()}};
   };
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Dynamic; }
 };
 
 struct RawContentSection : Section {
   std::optional<llvm::yaml::Hex64> Info;
 
   RawContentSection() : Section(ChunkKind::RawContent) {}
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::RawContent;
   }
 
   // Is used when a content is read as an array of bytes.
   std::optional<std::vector<uint8_t>> ContentBuf;
 };
 
 struct NoBitsSection : Section {
   NoBitsSection() : Section(ChunkKind::NoBits) {}
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::NoBits; }
 };
 
 struct NoteSection : Section {
   std::optional<std::vector<ELFYAML::NoteEntry>> Notes;
 
   NoteSection() : Section(ChunkKind::Note) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Notes", Notes.has_value()}};
   };
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Note; }
 };
 
 struct HashSection : Section {
   std::optional<std::vector<uint32_t>> Bucket;
   std::optional<std::vector<uint32_t>> Chain;
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Bucket", Bucket.has_value()}, {"Chain", Chain.has_value()}};
   };
 
   // The following members are used to override section fields.
   // This is useful for creating invalid objects.
   std::optional<llvm::yaml::Hex64> NBucket;
   std::optional<llvm::yaml::Hex64> NChain;
 
   HashSection() : Section(ChunkKind::Hash) {}
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Hash; }
 };
 
 struct GnuHashHeader {
   // The number of hash buckets.
   // Not used when dumping the object, but can be used to override
   // the real number of buckets when emiting an object from a YAML document.
   std::optional<llvm::yaml::Hex32> NBuckets;
 
   // Index of the first symbol in the dynamic symbol table
   // included in the hash table.
   llvm::yaml::Hex32 SymNdx;
 
   // The number of words in the Bloom filter.
   // Not used when dumping the object, but can be used to override the real
   // number of words in the Bloom filter when emiting an object from a YAML
   // document.
   std::optional<llvm::yaml::Hex32> MaskWords;
 
   // A shift constant used by the Bloom filter.
   llvm::yaml::Hex32 Shift2;
 };
 
 struct GnuHashSection : Section {
   std::optional<GnuHashHeader> Header;
   std::optional<std::vector<llvm::yaml::Hex64>> BloomFilter;
   std::optional<std::vector<llvm::yaml::Hex32>> HashBuckets;
   std::optional<std::vector<llvm::yaml::Hex32>> HashValues;
 
   GnuHashSection() : Section(ChunkKind::GnuHash) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Header", Header.has_value()},
             {"BloomFilter", BloomFilter.has_value()},
             {"HashBuckets", HashBuckets.has_value()},
             {"HashValues", HashValues.has_value()}};
   };
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::GnuHash; }
 };
 
 struct VernauxEntry {
   uint32_t Hash;
   uint16_t Flags;
   uint16_t Other;
   StringRef Name;
 };
 
 struct VerneedEntry {
   uint16_t Version;
   StringRef File;
   std::vector<VernauxEntry> AuxV;
 };
 
 struct VerneedSection : Section {
   std::optional<std::vector<VerneedEntry>> VerneedV;
   std::optional<llvm::yaml::Hex64> Info;
 
   VerneedSection() : Section(ChunkKind::Verneed) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Dependencies", VerneedV.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::Verneed;
   }
 };
 
 struct AddrsigSection : Section {
   std::optional<std::vector<YAMLFlowString>> Symbols;
 
   AddrsigSection() : Section(ChunkKind::Addrsig) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Symbols", Symbols.has_value()}};
   };
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Addrsig; }
 };
 
 struct LinkerOption {
   StringRef Key;
   StringRef Value;
 };
 
 struct LinkerOptionsSection : Section {
   std::optional<std::vector<LinkerOption>> Options;
 
   LinkerOptionsSection() : Section(ChunkKind::LinkerOptions) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Options", Options.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::LinkerOptions;
   }
 };
 
 struct DependentLibrariesSection : Section {
   std::optional<std::vector<YAMLFlowString>> Libs;
 
   DependentLibrariesSection() : Section(ChunkKind::DependentLibraries) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Libraries", Libs.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::DependentLibraries;
   }
 };
 
 // Represents the call graph profile section entry.
 struct CallGraphEntryWeight {
   // The weight of the edge.
   uint64_t Weight;
 };
 
 struct CallGraphProfileSection : Section {
   std::optional<std::vector<CallGraphEntryWeight>> Entries;
 
   CallGraphProfileSection() : Section(ChunkKind::CallGraphProfile) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Entries", Entries.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::CallGraphProfile;
   }
 };
 
 struct SymverSection : Section {
   std::optional<std::vector<uint16_t>> Entries;
 
   SymverSection() : Section(ChunkKind::Symver) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Entries", Entries.has_value()}};
   };
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Symver; }
 };
 
 struct VerdefEntry {
   std::optional<uint16_t> Version;
   std::optional<uint16_t> Flags;
   std::optional<uint16_t> VersionNdx;
   std::optional<uint32_t> Hash;
   std::optional<uint16_t> VDAux;
   std::vector<StringRef> VerNames;
 };
 
 struct VerdefSection : Section {
   std::optional<std::vector<VerdefEntry>> Entries;
   std::optional<llvm::yaml::Hex64> Info;
 
   VerdefSection() : Section(ChunkKind::Verdef) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Entries", Entries.has_value()}};
   };
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Verdef; }
 };
 
 struct GroupSection : Section {
   // Members of a group contain a flag and a list of section indices
   // that are part of the group.
   std::optional<std::vector<SectionOrType>> Members;
   std::optional<StringRef> Signature; /* Info */
 
   GroupSection() : Section(ChunkKind::Group) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Members", Members.has_value()}};
   };
 
   static bool classof(const Chunk *S) { return S->Kind == ChunkKind::Group; }
 };
 
 struct Relocation {
   llvm::yaml::Hex64 Offset;
   YAMLIntUInt Addend;
   ELF_REL Type;
   std::optional<StringRef> Symbol;
 };
 
 struct RelocationSection : Section {
   std::optional<std::vector<Relocation>> Relocations;
   StringRef RelocatableSec; /* Info */
 
   RelocationSection() : Section(ChunkKind::Relocation) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Relocations", Relocations.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::Relocation;
   }
 };
 
 struct RelrSection : Section {
   std::optional<std::vector<llvm::yaml::Hex64>> Entries;
 
   RelrSection() : Section(ChunkKind::Relr) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Entries", Entries.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::Relr;
   }
 };
 
 struct SymtabShndxSection : Section {
   std::optional<std::vector<uint32_t>> Entries;
 
   SymtabShndxSection() : Section(ChunkKind::SymtabShndxSection) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Entries", Entries.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::SymtabShndxSection;
   }
 };
 
 struct ARMIndexTableEntry {
   llvm::yaml::Hex32 Offset;
   llvm::yaml::Hex32 Value;
 };
 
 struct ARMIndexTableSection : Section {
   std::optional<std::vector<ARMIndexTableEntry>> Entries;
 
   ARMIndexTableSection() : Section(ChunkKind::ARMIndexTable) {}
 
   std::vector<std::pair<StringRef, bool>> getEntries() const override {
     return {{"Entries", Entries.has_value()}};
   };
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::ARMIndexTable;
   }
 };
 
 // Represents .MIPS.abiflags section
 struct MipsABIFlags : Section {
   llvm::yaml::Hex16 Version;
   MIPS_ISA ISALevel;
   llvm::yaml::Hex8 ISARevision;
   MIPS_AFL_REG GPRSize;
   MIPS_AFL_REG CPR1Size;
   MIPS_AFL_REG CPR2Size;
   MIPS_ABI_FP FpABI;
   MIPS_AFL_EXT ISAExtension;
   MIPS_AFL_ASE ASEs;
   MIPS_AFL_FLAGS1 Flags1;
   llvm::yaml::Hex32 Flags2;
 
   MipsABIFlags() : Section(ChunkKind::MipsABIFlags) {}
 
   static bool classof(const Chunk *S) {
     return S->Kind == ChunkKind::MipsABIFlags;
   }
 };
 
 struct ProgramHeader {
   ELF_PT Type;
   ELF_PF Flags;
   llvm::yaml::Hex64 VAddr;
   llvm::yaml::Hex64 PAddr;
   std::optional<llvm::yaml::Hex64> Align;
   std::optional<llvm::yaml::Hex64> FileSize;
   std::optional<llvm::yaml::Hex64> MemSize;
   std::optional<llvm::yaml::Hex64> Offset;
   std::optional<StringRef> FirstSec;
   std::optional<StringRef> LastSec;
 
   // This vector contains all chunks from [FirstSec, LastSec].
   std::vector<Chunk *> Chunks;
 };
 
 struct Object {
   FileHeader Header;
   std::vector<ProgramHeader> ProgramHeaders;
 
   // An object might contain output section descriptions as well as
   // custom data that does not belong to any section.
   std::vector<std::unique_ptr<Chunk>> Chunks;
 
   // Although in reality the symbols reside in a section, it is a lot
   // cleaner and nicer if we read them from the YAML as a separate
   // top-level key, which automatically ensures that invariants like there
   // being a single SHT_SYMTAB section are upheld.
   std::optional<std::vector<Symbol>> Symbols;
   std::optional<std::vector<Symbol>> DynamicSymbols;
   std::optional<DWARFYAML::Data> DWARF;
 
   std::vector<Section *> getSections() {
     std::vector<Section *> Ret;
     for (const std::unique_ptr<Chunk> &Sec : Chunks)
       if (auto S = dyn_cast<ELFYAML::Section>(Sec.get()))
         Ret.push_back(S);
     return Ret;
   }
 
   const SectionHeaderTable &getSectionHeaderTable() const {
     for (const std::unique_ptr<Chunk> &C : Chunks)
       if (auto *S = dyn_cast<ELFYAML::SectionHeaderTable>(C.get()))
         return *S;
     llvm_unreachable("the section header table chunk must always be present");
   }
 
   ELF_ELFOSABI getOSAbi() const;
   unsigned getMachine() const;
 };
 
 bool shouldAllocateFileSpace(ArrayRef<ProgramHeader> Phdrs,
                              const NoBitsSection &S);
 
 } // end namespace ELFYAML
 } // end namespace llvm
 
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::StackSizeEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::BBAddrMapEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::BBAddrMapEntry::BBEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::BBAddrMapEntry::BBRangeEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::PGOAnalysisMapEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::PGOAnalysisMapEntry::PGOBBEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(
     llvm::ELFYAML::PGOAnalysisMapEntry::PGOBBEntry::SuccessorEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::DynamicEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::LinkerOption)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::CallGraphEntryWeight)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::NoteEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::ProgramHeader)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::SectionHeader)
 LLVM_YAML_IS_SEQUENCE_VECTOR(std::unique_ptr<llvm::ELFYAML::Chunk>)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::Symbol)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::VerdefEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::VernauxEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::VerneedEntry)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::Relocation)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::SectionOrType)
 LLVM_YAML_IS_SEQUENCE_VECTOR(llvm::ELFYAML::ARMIndexTableEntry)
 
 namespace llvm {
 namespace yaml {
 
 template <> struct ScalarTraits<ELFYAML::YAMLIntUInt> {
   static void output(const ELFYAML::YAMLIntUInt &Val, void *Ctx,
                      raw_ostream &Out);
   static StringRef input(StringRef Scalar, void *Ctx,
                          ELFYAML::YAMLIntUInt &Val);
   static QuotingType mustQuote(StringRef) { return QuotingType::None; }
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_ET> {
   static void enumeration(IO &IO, ELFYAML::ELF_ET &Value);
 };
 
 template <> struct ScalarEnumerationTraits<ELFYAML::ELF_PT> {
   static void enumeration(IO &IO, ELFYAML::ELF_PT &Value);
 };
 
 template <> struct ScalarEnumerationTraits<ELFYAML::ELF_NT> {
   static void enumeration(IO &IO, ELFYAML::ELF_NT &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_EM> {
   static void enumeration(IO &IO, ELFYAML::ELF_EM &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_ELFCLASS> {
   static void enumeration(IO &IO, ELFYAML::ELF_ELFCLASS &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_ELFDATA> {
   static void enumeration(IO &IO, ELFYAML::ELF_ELFDATA &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_ELFOSABI> {
   static void enumeration(IO &IO, ELFYAML::ELF_ELFOSABI &Value);
 };
 
 template <>
 struct ScalarBitSetTraits<ELFYAML::ELF_EF> {
   static void bitset(IO &IO, ELFYAML::ELF_EF &Value);
 };
 
 template <> struct ScalarBitSetTraits<ELFYAML::ELF_PF> {
   static void bitset(IO &IO, ELFYAML::ELF_PF &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_SHT> {
   static void enumeration(IO &IO, ELFYAML::ELF_SHT &Value);
 };
 
 template <>
 struct ScalarBitSetTraits<ELFYAML::ELF_SHF> {
   static void bitset(IO &IO, ELFYAML::ELF_SHF &Value);
 };
 
 template <> struct ScalarEnumerationTraits<ELFYAML::ELF_SHN> {
   static void enumeration(IO &IO, ELFYAML::ELF_SHN &Value);
 };
 
 template <> struct ScalarEnumerationTraits<ELFYAML::ELF_STB> {
   static void enumeration(IO &IO, ELFYAML::ELF_STB &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_STT> {
   static void enumeration(IO &IO, ELFYAML::ELF_STT &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_REL> {
   static void enumeration(IO &IO, ELFYAML::ELF_REL &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_DYNTAG> {
   static void enumeration(IO &IO, ELFYAML::ELF_DYNTAG &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::ELF_RSS> {
   static void enumeration(IO &IO, ELFYAML::ELF_RSS &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::MIPS_AFL_REG> {
   static void enumeration(IO &IO, ELFYAML::MIPS_AFL_REG &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::MIPS_ABI_FP> {
   static void enumeration(IO &IO, ELFYAML::MIPS_ABI_FP &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::MIPS_AFL_EXT> {
   static void enumeration(IO &IO, ELFYAML::MIPS_AFL_EXT &Value);
 };
 
 template <>
 struct ScalarEnumerationTraits<ELFYAML::MIPS_ISA> {
   static void enumeration(IO &IO, ELFYAML::MIPS_ISA &Value);
 };
 
 template <>
 struct ScalarBitSetTraits<ELFYAML::MIPS_AFL_ASE> {
   static void bitset(IO &IO, ELFYAML::MIPS_AFL_ASE &Value);
 };
 
 template <>
 struct ScalarBitSetTraits<ELFYAML::MIPS_AFL_FLAGS1> {
   static void bitset(IO &IO, ELFYAML::MIPS_AFL_FLAGS1 &Value);
 };
 
 template <>
 struct MappingTraits<ELFYAML::FileHeader> {
   static void mapping(IO &IO, ELFYAML::FileHeader &FileHdr);
 };
 
 template <> struct MappingTraits<ELFYAML::SectionHeader> {
   static void mapping(IO &IO, ELFYAML::SectionHeader &SHdr);
 };
 
 template <> struct MappingTraits<ELFYAML::ProgramHeader> {
   static void mapping(IO &IO, ELFYAML::ProgramHeader &FileHdr);
   static std::string validate(IO &IO, ELFYAML::ProgramHeader &FileHdr);
 };
 
 template <>
 struct MappingTraits<ELFYAML::Symbol> {
   static void mapping(IO &IO, ELFYAML::Symbol &Symbol);
   static std::string validate(IO &IO, ELFYAML::Symbol &Symbol);
 };
 
 template <> struct MappingTraits<ELFYAML::StackSizeEntry> {
   static void mapping(IO &IO, ELFYAML::StackSizeEntry &Rel);
 };
 
 template <> struct MappingTraits<ELFYAML::BBAddrMapEntry> {
   static void mapping(IO &IO, ELFYAML::BBAddrMapEntry &E);
 };
 
 template <> struct MappingTraits<ELFYAML::BBAddrMapEntry::BBRangeEntry> {
   static void mapping(IO &IO, ELFYAML::BBAddrMapEntry::BBRangeEntry &E);
 };
 
 template <> struct MappingTraits<ELFYAML::BBAddrMapEntry::BBEntry> {
   static void mapping(IO &IO, ELFYAML::BBAddrMapEntry::BBEntry &E);
 };
 
 template <> struct MappingTraits<ELFYAML::PGOAnalysisMapEntry> {
   static void mapping(IO &IO, ELFYAML::PGOAnalysisMapEntry &Rel);
 };
 
 template <> struct MappingTraits<ELFYAML::PGOAnalysisMapEntry::PGOBBEntry> {
   static void mapping(IO &IO, ELFYAML::PGOAnalysisMapEntry::PGOBBEntry &Rel);
 };
 
 template <>
 struct MappingTraits<ELFYAML::PGOAnalysisMapEntry::PGOBBEntry::SuccessorEntry> {
   static void
   mapping(IO &IO,
           ELFYAML::PGOAnalysisMapEntry::PGOBBEntry::SuccessorEntry &Rel);
 };
 
 template <> struct MappingTraits<ELFYAML::GnuHashHeader> {
   static void mapping(IO &IO, ELFYAML::GnuHashHeader &Rel);
 };
 
 template <> struct MappingTraits<ELFYAML::DynamicEntry> {
   static void mapping(IO &IO, ELFYAML::DynamicEntry &Rel);
 };
 
 template <> struct MappingTraits<ELFYAML::NoteEntry> {
   static void mapping(IO &IO, ELFYAML::NoteEntry &N);
 };
 
 template <> struct MappingTraits<ELFYAML::VerdefEntry> {
   static void mapping(IO &IO, ELFYAML::VerdefEntry &E);
 };
 
 template <> struct MappingTraits<ELFYAML::VerneedEntry> {
   static void mapping(IO &IO, ELFYAML::VerneedEntry &E);
 };
 
 template <> struct MappingTraits<ELFYAML::VernauxEntry> {
   static void mapping(IO &IO, ELFYAML::VernauxEntry &E);
 };
 
 template <> struct MappingTraits<ELFYAML::LinkerOption> {
   static void mapping(IO &IO, ELFYAML::LinkerOption &Sym);
 };
 
 template <> struct MappingTraits<ELFYAML::CallGraphEntryWeight> {
   static void mapping(IO &IO, ELFYAML::CallGraphEntryWeight &E);
 };
 
 template <> struct MappingTraits<ELFYAML::Relocation> {
   static void mapping(IO &IO, ELFYAML::Relocation &Rel);
 };
 
 template <> struct MappingTraits<ELFYAML::ARMIndexTableEntry> {
   static void mapping(IO &IO, ELFYAML::ARMIndexTableEntry &E);
 };
 
 template <> struct MappingTraits<std::unique_ptr<ELFYAML::Chunk>> {
   static void mapping(IO &IO, std::unique_ptr<ELFYAML::Chunk> &C);
   static std::string validate(IO &io, std::unique_ptr<ELFYAML::Chunk> &C);
 };
 
 template <>
 struct MappingTraits<ELFYAML::Object> {
   static void mapping(IO &IO, ELFYAML::Object &Object);
 };
 
 template <> struct MappingTraits<ELFYAML::SectionOrType> {
   static void mapping(IO &IO, ELFYAML::SectionOrType &sectionOrType);
 };
 
 } // end namespace yaml
 } // end namespace llvm
 
 #endif // LLVM_OBJECTYAML_ELFYAML_H

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