#ifndef LLVM_RUNTIME_DYLD_IMPL_H
#define LLVM_RUNTIME_DYLD_IMPL_H
+#include "ObjectImage.h"
#include "llvm/ExecutionEngine/RuntimeDyld.h"
-#include "llvm/Object/MachOObject.h"
#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/IndexedMap.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/Twine.h"
#include "llvm/ADT/SmallVector.h"
-#include "llvm/ExecutionEngine/ExecutionEngine.h"
-#include "llvm/Support/Format.h"
-#include "llvm/Support/Memory.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/system_error.h"
-#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/system_error.h"
+#include <map>
using namespace llvm;
using namespace llvm::object;
namespace llvm {
+
+class MemoryBuffer;
+class Twine;
+
+
+/// SectionEntry - represents a section emitted into memory by the dynamic
+/// linker.
+class SectionEntry {
+public:
+ /// Address - address in the linker's memory where the section resides.
+ uint8_t *Address;
+
+ /// Size - section size.
+ size_t Size;
+
+ /// LoadAddress - the address of the section in the target process's memory.
+ /// Used for situations in which JIT-ed code is being executed in the address
+ /// space of a separate process. If the code executes in the same address
+ /// space where it was JIT-ed, this just equals Address.
+ uint64_t LoadAddress;
+
+ /// StubOffset - used for architectures with stub functions for far
+ /// relocations (like ARM).
+ uintptr_t StubOffset;
+
+ /// ObjAddress - address of the section in the in-memory object file. Used
+ /// for calculating relocations in some object formats (like MachO).
+ uintptr_t ObjAddress;
+
+ SectionEntry(uint8_t *address, size_t size, uintptr_t stubOffset,
+ uintptr_t objAddress)
+ : Address(address), Size(size), LoadAddress((uintptr_t)address),
+ StubOffset(stubOffset), ObjAddress(objAddress) {}
+};
+
+/// RelocationEntry - used to represent relocations internally in the dynamic
+/// linker.
+class RelocationEntry {
+public:
+ /// SectionID - the section this relocation points to.
+ unsigned SectionID;
+
+ /// Offset - offset into the section.
+ uintptr_t Offset;
+
+ /// RelType - relocation type.
+ uint32_t RelType;
+
+ /// Addend - the relocation addend encoded in the instruction itself. Also
+ /// used to make a relocation section relative instead of symbol relative.
+ intptr_t Addend;
+
+ RelocationEntry(unsigned id, uint64_t offset, uint32_t type, int64_t addend)
+ : SectionID(id), Offset(offset), RelType(type), Addend(addend) {}
+};
+
+/// ObjRelocationInfo - relocation information as read from the object file.
+/// Used to pass around data taken from object::RelocationRef, together with
+/// the section to which the relocation points (represented by a SectionID).
+class ObjRelocationInfo {
+public:
+ unsigned SectionID;
+ uint64_t Offset;
+ SymbolRef Symbol;
+ uint64_t Type;
+ int64_t AdditionalInfo;
+};
+
+class RelocationValueRef {
+public:
+ unsigned SectionID;
+ intptr_t Addend;
+ const char *SymbolName;
+ RelocationValueRef(): SectionID(0), Addend(0), SymbolName(0) {}
+
+ inline bool operator==(const RelocationValueRef &Other) const {
+ return std::memcmp(this, &Other, sizeof(RelocationValueRef)) == 0;
+ }
+ inline bool operator <(const RelocationValueRef &Other) const {
+ return std::memcmp(this, &Other, sizeof(RelocationValueRef)) < 0;
+ }
+};
+
class RuntimeDyldImpl {
protected:
- unsigned CPUType;
- unsigned CPUSubtype;
-
// The MemoryManager to load objects into.
RTDyldMemoryManager *MemMgr;
- // For each section, we have a MemoryBlock of it's data.
- // Indexed by SectionID.
- SmallVector<sys::MemoryBlock, 32> Sections;
- // For each section, the address it will be considered to live at for
- // relocations. The same as the pointer to the above memory block for hosted
- // JITs. Indexed by SectionID.
- SmallVector<uint64_t, 32> SectionLoadAddress;
+ // A list of all sections emitted by the dynamic linker. These sections are
+ // referenced in the code by means of their index in this list - SectionID.
+ typedef SmallVector<SectionEntry, 64> SectionList;
+ SectionList Sections;
- // Keep a map of starting local address to the SectionID which references it.
- // Lookup function for when we assign virtual addresses.
- DenseMap<void *, unsigned> SectionLocalMemToID;
+ // Keep a map of sections from object file to the SectionID which
+ // references it.
+ typedef std::map<SectionRef, unsigned> ObjSectionToIDMap;
// Master symbol table. As modules are loaded and external symbols are
// resolved, their addresses are stored here as a SectionID/Offset pair.
- typedef std::pair<unsigned, uint64_t> SymbolLoc;
+ typedef std::pair<unsigned, uintptr_t> SymbolLoc;
StringMap<SymbolLoc> SymbolTable;
+ typedef DenseMap<const char*, SymbolLoc> LocalSymbolMap;
+
+ // Keep a map of common symbols to their sizes
+ typedef std::map<SymbolRef, unsigned> CommonSymbolMap;
+
+ // For each symbol, keep a list of relocations based on it. Anytime
+ // its address is reassigned (the JIT re-compiled the function, e.g.),
+ // the relocations get re-resolved.
+ // The symbol (or section) the relocation is sourced from is the Key
+ // in the relocation list where it's stored.
+ typedef SmallVector<RelocationEntry, 64> RelocationList;
+ // Relocations to sections already loaded. Indexed by SectionID which is the
+ // source of the address. The target where the address will be writen is
+ // SectionID/Offset in the relocation itself.
+ DenseMap<unsigned, RelocationList> Relocations;
+ // Relocations to external symbols that are not yet resolved.
+ // Indexed by symbol name.
+ StringMap<RelocationList> SymbolRelocations;
+
+ typedef std::map<RelocationValueRef, uintptr_t> StubMap;
+
+ Triple::ArchType Arch;
+
+ inline unsigned getMaxStubSize() {
+ if (Arch == Triple::arm || Arch == Triple::thumb)
+ return 8; // 32-bit instruction and 32-bit address
+ else
+ return 0;
+ }
bool HasError;
std::string ErrorStr;
}
uint8_t *getSectionAddress(unsigned SectionID) {
- return (uint8_t*)Sections[SectionID].base();
+ return (uint8_t*)Sections[SectionID].Address;
+ }
+
+ /// \brief Emits a section containing common symbols.
+ /// \return SectionID.
+ unsigned emitCommonSymbols(ObjectImage &Obj,
+ const CommonSymbolMap &Map,
+ uint64_t TotalSize,
+ LocalSymbolMap &Symbols);
+
+ /// \brief Emits section data from the object file to the MemoryManager.
+ /// \param IsCode if it's true then allocateCodeSection() will be
+ /// used for emits, else allocateDataSection() will be used.
+ /// \return SectionID.
+ unsigned emitSection(ObjectImage &Obj,
+ const SectionRef &Section,
+ bool IsCode);
+
+ /// \brief Find Section in LocalSections. If the secton is not found - emit
+ /// it and store in LocalSections.
+ /// \param IsCode if it's true then allocateCodeSection() will be
+ /// used for emmits, else allocateDataSection() will be used.
+ /// \return SectionID.
+ unsigned findOrEmitSection(ObjectImage &Obj,
+ const SectionRef &Section,
+ bool IsCode,
+ ObjSectionToIDMap &LocalSections);
+
+ /// \brief If Value.SymbolName is NULL then store relocation to the
+ /// Relocations, else store it in the SymbolRelocations.
+ void addRelocation(const RelocationValueRef &Value, unsigned SectionID,
+ uintptr_t Offset, uint32_t RelType);
+
+ /// \brief Emits long jump instruction to Addr.
+ /// \return Pointer to the memory area for emitting target address.
+ uint8_t* createStubFunction(uint8_t *Addr);
+
+ /// \brief Resolves relocations from Relocs list with address from Value.
+ void resolveRelocationList(const RelocationList &Relocs, uint64_t Value);
+ void resolveRelocationEntry(const RelocationEntry &RE, uint64_t Value);
+
+ /// \brief A object file specific relocation resolver
+ /// \param Address Address to apply the relocation action
+ /// \param Value Target symbol address to apply the relocation action
+ /// \param Type object file specific relocation type
+ /// \param Addend A constant addend used to compute the value to be stored
+ /// into the relocatable field
+ virtual void resolveRelocation(uint8_t *LocalAddress,
+ uint64_t FinalAddress,
+ uint64_t Value,
+ uint32_t Type,
+ int64_t Addend) = 0;
+
+ /// \brief Parses the object file relocation and stores it to Relocations
+ /// or SymbolRelocations (this depends on the object file type).
+ virtual void processRelocationRef(const ObjRelocationInfo &Rel,
+ ObjectImage &Obj,
+ ObjSectionToIDMap &ObjSectionToID,
+ LocalSymbolMap &Symbols,
+ StubMap &Stubs) = 0;
+
+ void resolveSymbols();
+ virtual ObjectImage *createObjectImage(const MemoryBuffer *InputBuffer);
+ virtual void handleObjectLoaded(ObjectImage *Obj)
+ {
+ // Subclasses may choose to retain this image if they have a use for it
+ delete Obj;
}
- void extractFunction(StringRef Name, uint8_t *StartAddress,
- uint8_t *EndAddress);
public:
RuntimeDyldImpl(RTDyldMemoryManager *mm) : MemMgr(mm), HasError(false) {}
virtual ~RuntimeDyldImpl();
- virtual bool loadObject(MemoryBuffer *InputBuffer) = 0;
+ bool loadObject(const MemoryBuffer *InputBuffer);
void *getSymbolAddress(StringRef Name) {
// FIXME: Just look up as a function for now. Overly simple of course.
return getSectionAddress(Loc.first) + Loc.second;
}
- virtual void resolveRelocations();
+ void resolveRelocations();
- virtual void reassignSectionAddress(unsigned SectionID, uint64_t Addr) = 0;
+ void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
void mapSectionAddress(void *LocalAddress, uint64_t TargetAddress);
StringRef getErrorString() { return ErrorStr; }
virtual bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const = 0;
-};
-
-class RuntimeDyldELF : public RuntimeDyldImpl {
- // For each symbol, keep a list of relocations based on it. Anytime
- // its address is reassigned (the JIT re-compiled the function, e.g.),
- // the relocations get re-resolved.
- struct RelocationEntry {
- // Function or section this relocation is contained in.
- std::string Target;
- // Offset into the target function or section for the relocation.
- uint32_t Offset;
- // Relocation type
- uint32_t Type;
- // Addend encoded in the instruction itself, if any.
- int32_t Addend;
- // Has the relocation been recalcuated as an offset within a function?
- bool IsFunctionRelative;
- // Has this relocation been resolved previously?
- bool isResolved;
-
- RelocationEntry(StringRef t,
- uint32_t offset,
- uint32_t type,
- int32_t addend,
- bool isFunctionRelative)
- : Target(t)
- , Offset(offset)
- , Type(type)
- , Addend(addend)
- , IsFunctionRelative(isFunctionRelative)
- , isResolved(false) { }
- };
- typedef SmallVector<RelocationEntry, 4> RelocationList;
- StringMap<RelocationList> Relocations;
- unsigned Arch;
-
- void resolveRelocations();
-
- void resolveX86_64Relocation(StringRef Name,
- uint8_t *Addr,
- const RelocationEntry &RE);
-
- void resolveX86Relocation(StringRef Name,
- uint8_t *Addr,
- const RelocationEntry &RE);
-
- void resolveArmRelocation(StringRef Name,
- uint8_t *Addr,
- const RelocationEntry &RE);
-
- void resolveRelocation(StringRef Name,
- uint8_t *Addr,
- const RelocationEntry &RE);
-
-public:
- RuntimeDyldELF(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
-
- bool loadObject(MemoryBuffer *InputBuffer);
-
- void reassignSymbolAddress(StringRef Name, uint8_t *Addr);
- void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
-
- bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const;
-};
-
-
-class RuntimeDyldMachO : public RuntimeDyldImpl {
- // For each symbol, keep a list of relocations based on it. Anytime
- // its address is reassigned (the JIT re-compiled the function, e.g.),
- // the relocations get re-resolved.
- // The symbol (or section) the relocation is sourced from is the Key
- // in the relocation list where it's stored.
- struct RelocationEntry {
- unsigned SectionID; // Section the relocation is contained in.
- uint64_t Offset; // Offset into the section for the relocation.
- uint32_t Data; // Second word of the raw macho relocation entry.
- int64_t Addend; // Addend encoded in the instruction itself, if any,
- // plus the offset into the source section for
- // the symbol once the relocation is resolvable.
-
- RelocationEntry(unsigned id, uint64_t offset, uint32_t data, int64_t addend)
- : SectionID(id), Offset(offset), Data(data), Addend(addend) {}
- };
- typedef SmallVector<RelocationEntry, 4> RelocationList;
- // Relocations to sections already loaded. Indexed by SectionID which is the
- // source of the address. The target where the address will be writen is
- // SectionID/Offset in the relocation itself.
- IndexedMap<RelocationList> Relocations;
- // Relocations to symbols that are not yet resolved. Must be external
- // relocations by definition. Indexed by symbol name.
- StringMap<RelocationList> UnresolvedRelocations;
-
- bool resolveRelocation(uint8_t *Address, uint64_t Value, bool isPCRel,
- unsigned Type, unsigned Size, int64_t Addend);
- bool resolveX86_64Relocation(uintptr_t Address, uintptr_t Value, bool isPCRel,
- unsigned Type, unsigned Size, int64_t Addend);
- bool resolveARMRelocation(uintptr_t Address, uintptr_t Value, bool isPCRel,
- unsigned Type, unsigned Size, int64_t Addend);
-
- bool loadSegment32(const MachOObject *Obj,
- const MachOObject::LoadCommandInfo *SegmentLCI,
- const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
- bool loadSegment64(const MachOObject *Obj,
- const MachOObject::LoadCommandInfo *SegmentLCI,
- const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
- bool processSymbols32(const MachOObject *Obj,
- SmallVectorImpl<unsigned> &SectionMap,
- SmallVectorImpl<StringRef> &SymbolNames,
- const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
- bool processSymbols64(const MachOObject *Obj,
- SmallVectorImpl<unsigned> &SectionMap,
- SmallVectorImpl<StringRef> &SymbolNames,
- const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
-
- void resolveSymbol(StringRef Name);
-
-public:
- RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
-
- bool loadObject(MemoryBuffer *InputBuffer);
-
- void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
-
- static bool isKnownFormat(const MemoryBuffer *InputBuffer);
-
- bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const {
- return isKnownFormat(InputBuffer);
- }
};
} // end namespace llvm
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