LCOV - code coverage report
Current view: top level - lib/ExecutionEngine/RuntimeDyld - RuntimeDyldImpl.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 88 95 92.6 %
Date: 2017-09-14 15:23:50 Functions: 8 10 80.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===-- RuntimeDyldImpl.h - Run-time dynamic linker for MC-JIT --*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // Interface for the implementations of runtime dynamic linker facilities.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDIMPL_H
      15             : #define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDIMPL_H
      16             : 
      17             : #include "llvm/ADT/SmallVector.h"
      18             : #include "llvm/ADT/StringMap.h"
      19             : #include "llvm/ADT/Triple.h"
      20             : #include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
      21             : #include "llvm/ExecutionEngine/RuntimeDyld.h"
      22             : #include "llvm/ExecutionEngine/RuntimeDyldChecker.h"
      23             : #include "llvm/Object/ObjectFile.h"
      24             : #include "llvm/Support/Debug.h"
      25             : #include "llvm/Support/ErrorHandling.h"
      26             : #include "llvm/Support/Format.h"
      27             : #include "llvm/Support/Host.h"
      28             : #include "llvm/Support/Mutex.h"
      29             : #include "llvm/Support/SwapByteOrder.h"
      30             : #include <map>
      31             : #include <system_error>
      32             : #include <unordered_map>
      33             : 
      34             : using namespace llvm;
      35             : using namespace llvm::object;
      36             : 
      37             : namespace llvm {
      38             : 
      39             : class Twine;
      40             : 
      41             : #define UNIMPLEMENTED_RELOC(RelType) \
      42             :   case RelType: \
      43             :     return make_error<RuntimeDyldError>("Unimplemented relocation: " #RelType)
      44             : 
      45             : /// SectionEntry - represents a section emitted into memory by the dynamic
      46             : /// linker.
      47        5201 : class SectionEntry {
      48             :   /// Name - section name.
      49             :   std::string Name;
      50             : 
      51             :   /// Address - address in the linker's memory where the section resides.
      52             :   uint8_t *Address;
      53             : 
      54             :   /// Size - section size. Doesn't include the stubs.
      55             :   size_t Size;
      56             : 
      57             :   /// LoadAddress - the address of the section in the target process's memory.
      58             :   /// Used for situations in which JIT-ed code is being executed in the address
      59             :   /// space of a separate process.  If the code executes in the same address
      60             :   /// space where it was JIT-ed, this just equals Address.
      61             :   uint64_t LoadAddress;
      62             : 
      63             :   /// StubOffset - used for architectures with stub functions for far
      64             :   /// relocations (like ARM).
      65             :   uintptr_t StubOffset;
      66             : 
      67             :   /// The total amount of space allocated for this section.  This includes the
      68             :   /// section size and the maximum amount of space that the stubs can occupy.
      69             :   size_t AllocationSize;
      70             : 
      71             :   /// ObjAddress - address of the section in the in-memory object file.  Used
      72             :   /// for calculating relocations in some object formats (like MachO).
      73             :   uintptr_t ObjAddress;
      74             : 
      75             : public:
      76             :   SectionEntry(StringRef name, uint8_t *address, size_t size,
      77             :                size_t allocationSize, uintptr_t objAddress)
      78         934 :       : Name(name), Address(address), Size(size),
      79             :         LoadAddress(reinterpret_cast<uintptr_t>(address)), StubOffset(size),
      80         934 :         AllocationSize(allocationSize), ObjAddress(objAddress) {
      81             :     // AllocationSize is used only in asserts, prevent an "unused private field"
      82             :     // warning:
      83             :     (void)AllocationSize;
      84             :   }
      85             : 
      86         490 :   StringRef getName() const { return Name; }
      87             : 
      88             :   uint8_t *getAddress() const { return Address; }
      89             : 
      90             :   /// \brief Return the address of this section with an offset.
      91             :   uint8_t *getAddressWithOffset(unsigned OffsetBytes) const {
      92             :     assert(OffsetBytes <= AllocationSize && "Offset out of bounds!");
      93        1258 :     return Address + OffsetBytes;
      94             :   }
      95             : 
      96             :   size_t getSize() const { return Size; }
      97             : 
      98             :   uint64_t getLoadAddress() const { return LoadAddress; }
      99         271 :   void setLoadAddress(uint64_t LA) { LoadAddress = LA; }
     100             : 
     101             :   /// \brief Return the load address of this section with an offset.
     102             :   uint64_t getLoadAddressWithOffset(unsigned OffsetBytes) const {
     103             :     assert(OffsetBytes <= AllocationSize && "Offset out of bounds!");
     104         515 :     return LoadAddress + OffsetBytes;
     105             :   }
     106             : 
     107             :   uintptr_t getStubOffset() const { return StubOffset; }
     108             : 
     109             :   void advanceStubOffset(unsigned StubSize) {
     110          19 :     StubOffset += StubSize;
     111             :     assert(StubOffset <= AllocationSize && "Not enough space allocated!");
     112             :   }
     113             : 
     114             :   uintptr_t getObjAddress() const { return ObjAddress; }
     115             : };
     116             : 
     117             : /// RelocationEntry - used to represent relocations internally in the dynamic
     118             : /// linker.
     119             : class RelocationEntry {
     120             : public:
     121             :   /// SectionID - the section this relocation points to.
     122             :   unsigned SectionID;
     123             : 
     124             :   /// Offset - offset into the section.
     125             :   uint64_t Offset;
     126             : 
     127             :   /// RelType - relocation type.
     128             :   uint32_t RelType;
     129             : 
     130             :   /// Addend - the relocation addend encoded in the instruction itself.  Also
     131             :   /// used to make a relocation section relative instead of symbol relative.
     132             :   int64_t Addend;
     133             : 
     134             :   struct SectionPair {
     135             :       uint32_t SectionA;
     136             :       uint32_t SectionB;
     137             :   };
     138             : 
     139             :   /// SymOffset - Section offset of the relocation entry's symbol (used for GOT
     140             :   /// lookup).
     141             :   union {
     142             :     uint64_t SymOffset;
     143             :     SectionPair Sections;
     144             :   };
     145             : 
     146             :   /// True if this is a PCRel relocation (MachO specific).
     147             :   bool IsPCRel;
     148             : 
     149             :   /// The size of this relocation (MachO specific).
     150             :   unsigned Size;
     151             : 
     152             :   // ARM (MachO and COFF) specific.
     153             :   bool IsTargetThumbFunc = false;
     154             : 
     155             :   RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend)
     156         174 :       : SectionID(id), Offset(offset), RelType(type), Addend(addend),
     157         180 :         SymOffset(0), IsPCRel(false), Size(0), IsTargetThumbFunc(false) {}
     158             : 
     159             :   RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend,
     160             :                   uint64_t symoffset)
     161        1150 :       : SectionID(id), Offset(offset), RelType(type), Addend(addend),
     162             :         SymOffset(symoffset), IsPCRel(false), Size(0),
     163        1150 :         IsTargetThumbFunc(false) {}
     164             : 
     165             :   RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend,
     166             :                   bool IsPCRel, unsigned Size)
     167          60 :       : SectionID(id), Offset(offset), RelType(type), Addend(addend),
     168          60 :         SymOffset(0), IsPCRel(IsPCRel), Size(Size), IsTargetThumbFunc(false) {}
     169             : 
     170             :   RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend,
     171             :                   unsigned SectionA, uint64_t SectionAOffset, unsigned SectionB,
     172             :                   uint64_t SectionBOffset, bool IsPCRel, unsigned Size)
     173          24 :       : SectionID(id), Offset(offset), RelType(type),
     174          18 :         Addend(SectionAOffset - SectionBOffset + addend), IsPCRel(IsPCRel),
     175          42 :         Size(Size), IsTargetThumbFunc(false) {
     176          24 :     Sections.SectionA = SectionA;
     177          24 :     Sections.SectionB = SectionB;
     178             :   }
     179             : 
     180             :   RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend,
     181             :                   unsigned SectionA, uint64_t SectionAOffset, unsigned SectionB,
     182             :                   uint64_t SectionBOffset, bool IsPCRel, unsigned Size,
     183             :                   bool IsTargetThumbFunc)
     184           6 :       : SectionID(id), Offset(offset), RelType(type),
     185           6 :         Addend(SectionAOffset - SectionBOffset + addend), IsPCRel(IsPCRel),
     186          12 :         Size(Size), IsTargetThumbFunc(IsTargetThumbFunc) {
     187           6 :     Sections.SectionA = SectionA;
     188           6 :     Sections.SectionB = SectionB;
     189             :   }
     190             : };
     191             : 
     192             : class RelocationValueRef {
     193             : public:
     194             :   unsigned SectionID;
     195             :   uint64_t Offset;
     196             :   int64_t Addend;
     197             :   const char *SymbolName;
     198             :   bool IsStubThumb = false;
     199        1318 :   RelocationValueRef() : SectionID(0), Offset(0), Addend(0),
     200        1360 :                          SymbolName(nullptr) {}
     201             : 
     202             :   inline bool operator==(const RelocationValueRef &Other) const {
     203          18 :     return SectionID == Other.SectionID && Offset == Other.Offset &&
     204          24 :            Addend == Other.Addend && SymbolName == Other.SymbolName &&
     205           6 :            IsStubThumb == Other.IsStubThumb;
     206             :   }
     207             :   inline bool operator<(const RelocationValueRef &Other) const {
     208          34 :     if (SectionID != Other.SectionID)
     209           8 :       return SectionID < Other.SectionID;
     210          26 :     if (Offset != Other.Offset)
     211           0 :       return Offset < Other.Offset;
     212          26 :     if (Addend != Other.Addend)
     213           0 :       return Addend < Other.Addend;
     214          26 :     if (IsStubThumb != Other.IsStubThumb)
     215           0 :       return IsStubThumb < Other.IsStubThumb;
     216          26 :     return SymbolName < Other.SymbolName;
     217             :   }
     218             : };
     219             : 
     220             : /// @brief Symbol info for RuntimeDyld.
     221             : class SymbolTableEntry {
     222             : public:
     223        1694 :   SymbolTableEntry() = default;
     224             : 
     225             :   SymbolTableEntry(unsigned SectionID, uint64_t Offset, JITSymbolFlags Flags)
     226             :       : Offset(Offset), SectionID(SectionID), Flags(Flags) {}
     227             : 
     228             :   unsigned getSectionID() const { return SectionID; }
     229             :   uint64_t getOffset() const { return Offset; }
     230             :   void setOffset(uint64_t NewOffset) { Offset = NewOffset; }
     231             : 
     232             :   JITSymbolFlags getFlags() const { return Flags; }
     233             : 
     234             : private:
     235             :   uint64_t Offset = 0;
     236             :   unsigned SectionID = 0;
     237             :   JITSymbolFlags Flags = JITSymbolFlags::None;
     238             : };
     239             : 
     240             : typedef StringMap<SymbolTableEntry> RTDyldSymbolTable;
     241             : 
     242             : class RuntimeDyldImpl {
     243             :   friend class RuntimeDyld::LoadedObjectInfo;
     244             :   friend class RuntimeDyldCheckerImpl;
     245             : protected:
     246             :   static const unsigned AbsoluteSymbolSection = ~0U;
     247             : 
     248             :   // The MemoryManager to load objects into.
     249             :   RuntimeDyld::MemoryManager &MemMgr;
     250             : 
     251             :   // The symbol resolver to use for external symbols.
     252             :   JITSymbolResolver &Resolver;
     253             : 
     254             :   // Attached RuntimeDyldChecker instance. Null if no instance attached.
     255             :   RuntimeDyldCheckerImpl *Checker;
     256             : 
     257             :   // A list of all sections emitted by the dynamic linker.  These sections are
     258             :   // referenced in the code by means of their index in this list - SectionID.
     259             :   typedef SmallVector<SectionEntry, 64> SectionList;
     260             :   SectionList Sections;
     261             : 
     262             :   typedef unsigned SID; // Type for SectionIDs
     263             : #define RTDYLD_INVALID_SECTION_ID ((RuntimeDyldImpl::SID)(-1))
     264             : 
     265             :   // Keep a map of sections from object file to the SectionID which
     266             :   // references it.
     267             :   typedef std::map<SectionRef, unsigned> ObjSectionToIDMap;
     268             : 
     269             :   // A global symbol table for symbols from all loaded modules.
     270             :   RTDyldSymbolTable GlobalSymbolTable;
     271             : 
     272             :   // Keep a map of common symbols to their info pairs
     273             :   typedef std::vector<SymbolRef> CommonSymbolList;
     274             : 
     275             :   // For each symbol, keep a list of relocations based on it. Anytime
     276             :   // its address is reassigned (the JIT re-compiled the function, e.g.),
     277             :   // the relocations get re-resolved.
     278             :   // The symbol (or section) the relocation is sourced from is the Key
     279             :   // in the relocation list where it's stored.
     280             :   typedef SmallVector<RelocationEntry, 64> RelocationList;
     281             :   // Relocations to sections already loaded. Indexed by SectionID which is the
     282             :   // source of the address. The target where the address will be written is
     283             :   // SectionID/Offset in the relocation itself.
     284             :   std::unordered_map<unsigned, RelocationList> Relocations;
     285             : 
     286             :   // Relocations to external symbols that are not yet resolved.  Symbols are
     287             :   // external when they aren't found in the global symbol table of all loaded
     288             :   // modules.  This map is indexed by symbol name.
     289             :   StringMap<RelocationList> ExternalSymbolRelocations;
     290             : 
     291             : 
     292             :   typedef std::map<RelocationValueRef, uintptr_t> StubMap;
     293             : 
     294             :   Triple::ArchType Arch;
     295             :   bool IsTargetLittleEndian;
     296             :   bool IsMipsO32ABI;
     297             :   bool IsMipsN32ABI;
     298             :   bool IsMipsN64ABI;
     299             : 
     300             :   // True if all sections should be passed to the memory manager, false if only
     301             :   // sections containing relocations should be. Defaults to 'false'.
     302             :   bool ProcessAllSections;
     303             : 
     304             :   // This mutex prevents simultaneously loading objects from two different
     305             :   // threads.  This keeps us from having to protect individual data structures
     306             :   // and guarantees that section allocation requests to the memory manager
     307             :   // won't be interleaved between modules.  It is also used in mapSectionAddress
     308             :   // and resolveRelocations to protect write access to internal data structures.
     309             :   //
     310             :   // loadObject may be called on the same thread during the handling of of
     311             :   // processRelocations, and that's OK.  The handling of the relocation lists
     312             :   // is written in such a way as to work correctly if new elements are added to
     313             :   // the end of the list while the list is being processed.
     314             :   sys::Mutex lock;
     315             : 
     316             :   virtual unsigned getMaxStubSize() = 0;
     317             :   virtual unsigned getStubAlignment() = 0;
     318             : 
     319             :   bool HasError;
     320             :   std::string ErrorStr;
     321             : 
     322             :   uint64_t getSectionLoadAddress(unsigned SectionID) const {
     323        2162 :     return Sections[SectionID].getLoadAddress();
     324             :   }
     325             : 
     326             :   uint8_t *getSectionAddress(unsigned SectionID) const {
     327         394 :     return Sections[SectionID].getAddress();
     328             :   }
     329             : 
     330             :   void writeInt16BE(uint8_t *Addr, uint16_t Value) {
     331           2 :     if (IsTargetLittleEndian)
     332             :       sys::swapByteOrder(Value);
     333           2 :     *Addr       = (Value >> 8) & 0xFF;
     334           2 :     *(Addr + 1) = Value & 0xFF;
     335             :   }
     336             : 
     337             :   void writeInt32BE(uint8_t *Addr, uint32_t Value) {
     338           1 :     if (IsTargetLittleEndian)
     339             :       sys::swapByteOrder(Value);
     340           1 :     *Addr       = (Value >> 24) & 0xFF;
     341           1 :     *(Addr + 1) = (Value >> 16) & 0xFF;
     342           1 :     *(Addr + 2) = (Value >> 8) & 0xFF;
     343           1 :     *(Addr + 3) = Value & 0xFF;
     344             :   }
     345             : 
     346             :   void writeInt64BE(uint8_t *Addr, uint64_t Value) {
     347           1 :     if (IsTargetLittleEndian)
     348             :       sys::swapByteOrder(Value);
     349           1 :     *Addr       = (Value >> 56) & 0xFF;
     350           1 :     *(Addr + 1) = (Value >> 48) & 0xFF;
     351           1 :     *(Addr + 2) = (Value >> 40) & 0xFF;
     352           1 :     *(Addr + 3) = (Value >> 32) & 0xFF;
     353           1 :     *(Addr + 4) = (Value >> 24) & 0xFF;
     354           1 :     *(Addr + 5) = (Value >> 16) & 0xFF;
     355           1 :     *(Addr + 6) = (Value >> 8) & 0xFF;
     356           1 :     *(Addr + 7) = Value & 0xFF;
     357             :   }
     358             : 
     359          14 :   virtual void setMipsABI(const ObjectFile &Obj) {
     360          14 :     IsMipsO32ABI = false;
     361          14 :     IsMipsN32ABI = false;
     362          14 :     IsMipsN64ABI = false;
     363          14 :   }
     364             : 
     365             :   /// Endian-aware read Read the least significant Size bytes from Src.
     366             :   uint64_t readBytesUnaligned(uint8_t *Src, unsigned Size) const;
     367             : 
     368             :   /// Endian-aware write. Write the least significant Size bytes from Value to
     369             :   /// Dst.
     370             :   void writeBytesUnaligned(uint64_t Value, uint8_t *Dst, unsigned Size) const;
     371             : 
     372             :   /// Generate JITSymbolFlags from a libObject symbol.
     373             :   virtual JITSymbolFlags getJITSymbolFlags(const BasicSymbolRef &Sym);
     374             : 
     375             :   /// Modify the given target address based on the given symbol flags.
     376             :   /// This can be used by subclasses to tweak addresses based on symbol flags,
     377             :   /// For example: the MachO/ARM target uses it to set the low bit if the target
     378             :   /// is a thumb symbol.
     379        1199 :   virtual uint64_t modifyAddressBasedOnFlags(uint64_t Addr,
     380             :                                              JITSymbolFlags Flags) const {
     381        1199 :     return Addr;
     382             :   }
     383             : 
     384             :   /// \brief Given the common symbols discovered in the object file, emit a
     385             :   /// new section for them and update the symbol mappings in the object and
     386             :   /// symbol table.
     387             :   Error emitCommonSymbols(const ObjectFile &Obj,
     388             :                           CommonSymbolList &CommonSymbols);
     389             : 
     390             :   /// \brief Emits section data from the object file to the MemoryManager.
     391             :   /// \param IsCode if it's true then allocateCodeSection() will be
     392             :   ///        used for emits, else allocateDataSection() will be used.
     393             :   /// \return SectionID.
     394             :   Expected<unsigned> emitSection(const ObjectFile &Obj,
     395             :                                  const SectionRef &Section,
     396             :                                  bool IsCode);
     397             : 
     398             :   /// \brief Find Section in LocalSections. If the secton is not found - emit
     399             :   ///        it and store in LocalSections.
     400             :   /// \param IsCode if it's true then allocateCodeSection() will be
     401             :   ///        used for emmits, else allocateDataSection() will be used.
     402             :   /// \return SectionID.
     403             :   Expected<unsigned> findOrEmitSection(const ObjectFile &Obj,
     404             :                                        const SectionRef &Section, bool IsCode,
     405             :                                        ObjSectionToIDMap &LocalSections);
     406             : 
     407             :   // \brief Add a relocation entry that uses the given section.
     408             :   void addRelocationForSection(const RelocationEntry &RE, unsigned SectionID);
     409             : 
     410             :   // \brief Add a relocation entry that uses the given symbol.  This symbol may
     411             :   // be found in the global symbol table, or it may be external.
     412             :   void addRelocationForSymbol(const RelocationEntry &RE, StringRef SymbolName);
     413             : 
     414             :   /// \brief Emits long jump instruction to Addr.
     415             :   /// \return Pointer to the memory area for emitting target address.
     416             :   uint8_t *createStubFunction(uint8_t *Addr, unsigned AbiVariant = 0);
     417             : 
     418             :   /// \brief Resolves relocations from Relocs list with address from Value.
     419             :   void resolveRelocationList(const RelocationList &Relocs, uint64_t Value);
     420             : 
     421             :   /// \brief A object file specific relocation resolver
     422             :   /// \param RE The relocation to be resolved
     423             :   /// \param Value Target symbol address to apply the relocation action
     424             :   virtual void resolveRelocation(const RelocationEntry &RE, uint64_t Value) = 0;
     425             : 
     426             :   /// \brief Parses one or more object file relocations (some object files use
     427             :   ///        relocation pairs) and stores it to Relocations or SymbolRelocations
     428             :   ///        (this depends on the object file type).
     429             :   /// \return Iterator to the next relocation that needs to be parsed.
     430             :   virtual Expected<relocation_iterator>
     431             :   processRelocationRef(unsigned SectionID, relocation_iterator RelI,
     432             :                        const ObjectFile &Obj, ObjSectionToIDMap &ObjSectionToID,
     433             :                        StubMap &Stubs) = 0;
     434             : 
     435             :   /// \brief Resolve relocations to external symbols.
     436             :   Error resolveExternalSymbols();
     437             : 
     438             :   // \brief Compute an upper bound of the memory that is required to load all
     439             :   // sections
     440             :   Error computeTotalAllocSize(const ObjectFile &Obj,
     441             :                               uint64_t &CodeSize, uint32_t &CodeAlign,
     442             :                               uint64_t &RODataSize, uint32_t &RODataAlign,
     443             :                               uint64_t &RWDataSize, uint32_t &RWDataAlign);
     444             : 
     445             :   // \brief Compute GOT size
     446             :   unsigned computeGOTSize(const ObjectFile &Obj);
     447             : 
     448             :   // \brief Compute the stub buffer size required for a section
     449             :   unsigned computeSectionStubBufSize(const ObjectFile &Obj,
     450             :                                      const SectionRef &Section);
     451             : 
     452             :   // \brief Implementation of the generic part of the loadObject algorithm.
     453             :   Expected<ObjSectionToIDMap> loadObjectImpl(const object::ObjectFile &Obj);
     454             : 
     455             :   // \brief Return size of Global Offset Table (GOT) entry
     456           0 :   virtual size_t getGOTEntrySize() { return 0; }
     457             : 
     458             :   // \brief Return true if the relocation R may require allocating a GOT entry.
     459           0 :   virtual bool relocationNeedsGot(const RelocationRef &R) const {
     460           0 :     return false;
     461             :   }
     462             : 
     463             :   // \brief Return true if the relocation R may require allocating a stub.
     464          90 :   virtual bool relocationNeedsStub(const RelocationRef &R) const {
     465          90 :     return true;    // Conservative answer
     466             :   }
     467             : 
     468             : public:
     469         291 :   RuntimeDyldImpl(RuntimeDyld::MemoryManager &MemMgr,
     470             :                   JITSymbolResolver &Resolver)
     471         291 :     : MemMgr(MemMgr), Resolver(Resolver), Checker(nullptr),
     472        2037 :       ProcessAllSections(false), HasError(false) {
     473         291 :   }
     474             : 
     475             :   virtual ~RuntimeDyldImpl();
     476             : 
     477             :   void setProcessAllSections(bool ProcessAllSections) {
     478         291 :     this->ProcessAllSections = ProcessAllSections;
     479             :   }
     480             : 
     481             :   void setRuntimeDyldChecker(RuntimeDyldCheckerImpl *Checker) {
     482         291 :     this->Checker = Checker;
     483             :   }
     484             : 
     485             :   virtual std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
     486             :   loadObject(const object::ObjectFile &Obj) = 0;
     487             : 
     488          75 :   uint8_t* getSymbolLocalAddress(StringRef Name) const {
     489             :     // FIXME: Just look up as a function for now. Overly simple of course.
     490             :     // Work in progress.
     491          75 :     RTDyldSymbolTable::const_iterator pos = GlobalSymbolTable.find(Name);
     492         150 :     if (pos == GlobalSymbolTable.end())
     493             :       return nullptr;
     494          75 :     const auto &SymInfo = pos->second;
     495             :     // Absolute symbols do not have a local address.
     496          75 :     if (SymInfo.getSectionID() == AbsoluteSymbolSection)
     497             :       return nullptr;
     498         150 :     return getSectionAddress(SymInfo.getSectionID()) + SymInfo.getOffset();
     499             :   }
     500             : 
     501        1454 :   JITEvaluatedSymbol getSymbol(StringRef Name) const {
     502             :     // FIXME: Just look up as a function for now. Overly simple of course.
     503             :     // Work in progress.
     504        1454 :     RTDyldSymbolTable::const_iterator pos = GlobalSymbolTable.find(Name);
     505        2908 :     if (pos == GlobalSymbolTable.end())
     506             :       return nullptr;
     507        1058 :     const auto &SymEntry = pos->second;
     508        1058 :     uint64_t SectionAddr = 0;
     509        1058 :     if (SymEntry.getSectionID() != AbsoluteSymbolSection)
     510        2106 :       SectionAddr = getSectionLoadAddress(SymEntry.getSectionID());
     511        1058 :     uint64_t TargetAddr = SectionAddr + SymEntry.getOffset();
     512             : 
     513             :     // FIXME: Have getSymbol should return the actual address and the client
     514             :     //        modify it based on the flags. This will require clients to be
     515             :     //        aware of the target architecture, which we should build
     516             :     //        infrastructure for.
     517        1058 :     TargetAddr = modifyAddressBasedOnFlags(TargetAddr, SymEntry.getFlags());
     518        1058 :     return JITEvaluatedSymbol(TargetAddr, SymEntry.getFlags());
     519             :   }
     520             : 
     521             :   void resolveRelocations();
     522             : 
     523             :   void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
     524             : 
     525             :   void mapSectionAddress(const void *LocalAddress, uint64_t TargetAddress);
     526             : 
     527             :   // Is the linker in an error state?
     528             :   bool hasError() { return HasError; }
     529             : 
     530             :   // Mark the error condition as handled and continue.
     531             :   void clearError() { HasError = false; }
     532             : 
     533             :   // Get the error message.
     534           0 :   StringRef getErrorString() { return ErrorStr; }
     535             : 
     536             :   virtual bool isCompatibleFile(const ObjectFile &Obj) const = 0;
     537             : 
     538             :   virtual void registerEHFrames();
     539             : 
     540             :   void deregisterEHFrames();
     541             : 
     542           2 :   virtual Error finalizeLoad(const ObjectFile &ObjImg,
     543             :                              ObjSectionToIDMap &SectionMap) {
     544           6 :     return Error::success();
     545             :   }
     546             : };
     547             : 
     548             : } // end namespace llvm
     549             : 
     550             : #endif

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