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61dfa77fce
code that will be relocated into another memory space. Now when relocations are resolved, the address of the relocation in the host memory (where the JIT is) is passed separately from the address that the relocation will be at in the target memory (where the code will run). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152264 91177308-0d34-0410-b5e6-96231b3b80d8
110 lines
4.4 KiB
C++
110 lines
4.4 KiB
C++
//===-- RuntimeDyldMachO.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// MachO support for MC-JIT runtime dynamic linker.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_RUNTIME_DYLD_MACHO_H
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#define LLVM_RUNTIME_DYLD_MACHO_H
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#include "llvm/ADT/IndexedMap.h"
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#include "llvm/Object/MachOObject.h"
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#include "llvm/Support/Format.h"
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#include "RuntimeDyldImpl.h"
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using namespace llvm;
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using namespace llvm::object;
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namespace llvm {
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class RuntimeDyldMachO : public RuntimeDyldImpl {
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// For each symbol, keep a list of relocations based on it. Anytime
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// its address is reassigned (the JIT re-compiled the function, e.g.),
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// the relocations get re-resolved.
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// The symbol (or section) the relocation is sourced from is the Key
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// in the relocation list where it's stored.
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struct RelocationEntry {
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unsigned SectionID; // Section the relocation is contained in.
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uint64_t Offset; // Offset into the section for the relocation.
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uint32_t Data; // Second word of the raw macho relocation entry.
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int64_t Addend; // Addend encoded in the instruction itself, if any,
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// plus the offset into the source section for
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// the symbol once the relocation is resolvable.
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RelocationEntry(unsigned id, uint64_t offset, uint32_t data, int64_t addend)
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: SectionID(id), Offset(offset), Data(data), Addend(addend) {}
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};
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typedef SmallVector<RelocationEntry, 4> RelocationList;
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// Relocations to sections already loaded. Indexed by SectionID which is the
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// source of the address. The target where the address will be writen is
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// SectionID/Offset in the relocation itself.
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IndexedMap<RelocationList> Relocations;
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// Relocations to symbols that are not yet resolved. Must be external
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// relocations by definition. Indexed by symbol name.
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StringMap<RelocationList> UnresolvedRelocations;
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bool resolveRelocation(uint8_t *LocalAddress,
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uint64_t FinalAddress,
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uint64_t Value,
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bool isPCRel,
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unsigned Type,
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unsigned Size,
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int64_t Addend);
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bool resolveX86_64Relocation(uint8_t *LocalAddress,
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uint64_t FinalAddress,
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uint64_t Value,
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bool isPCRel,
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unsigned Type,
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unsigned Size,
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int64_t Addend);
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bool resolveARMRelocation(uint8_t *LocalAddress,
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uint64_t FinalAddress,
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uint64_t Value,
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bool isPCRel,
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unsigned Type,
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unsigned Size,
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int64_t Addend);
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bool loadSegment32(const MachOObject *Obj,
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const MachOObject::LoadCommandInfo *SegmentLCI,
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const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
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bool loadSegment64(const MachOObject *Obj,
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const MachOObject::LoadCommandInfo *SegmentLCI,
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const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
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bool processSymbols32(const MachOObject *Obj,
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SmallVectorImpl<unsigned> &SectionMap,
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SmallVectorImpl<StringRef> &SymbolNames,
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const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
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bool processSymbols64(const MachOObject *Obj,
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SmallVectorImpl<unsigned> &SectionMap,
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SmallVectorImpl<StringRef> &SymbolNames,
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const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
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void resolveSymbol(StringRef Name);
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public:
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RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
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bool loadObject(MemoryBuffer *InputBuffer);
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void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
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static bool isKnownFormat(const MemoryBuffer *InputBuffer);
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bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const {
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return isKnownFormat(InputBuffer);
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}
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};
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} // end namespace llvm
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#endif
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