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//===-- RuntimeDyldMachO.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// MachO support for MC-JIT runtime dynamic linker.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_RUNTIME_DYLD_MACHO_H
#define LLVM_RUNTIME_DYLD_MACHO_H
#include "llvm/ADT/IndexedMap.h"
#include "llvm/Object/MachOObject.h"
#include "llvm/Support/Format.h"
#include "RuntimeDyldImpl.h"
using namespace llvm;
using namespace llvm::object;
namespace llvm {
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;
// For each section, keep a list of referrers in that section that are clients
// of relocations in other sections. Whenever a relocation gets created,
// create a corresponding referrer. Whenever relocations are re-resolved,
// re-resolve the referrers' relocations as well.
struct Referrer {
unsigned SectionID; // Section whose RelocationList contains the relocation.
uint32_t Index; // Index of the RelocatonEntry in that RelocationList.
Referrer(unsigned id, uint32_t index)
: SectionID(id), Index(index) {}
};
typedef SmallVector<Referrer, 4> ReferrerList;
// 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;
// Referrers corresponding to Relocations.
IndexedMap<ReferrerList> Referrers;
// 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 *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
bool isPCRel,
unsigned Type,
unsigned Size,
int64_t Addend);
bool resolveX86_64Relocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
bool isPCRel,
unsigned Type,
unsigned Size,
int64_t Addend);
bool resolveARMRelocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_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
#endif
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