//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_RUNTIME_DYLD_MACHO_H
-#define LLVM_RUNTIME_DYLD_MACHO_H
+#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDMACHO_H
+#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDMACHO_H
-#include "ObjectImageCommon.h"
#include "RuntimeDyldImpl.h"
-#include "llvm/ADT/IndexedMap.h"
#include "llvm/Object/MachO.h"
#include "llvm/Support/Format.h"
+#define DEBUG_TYPE "dyld"
+
using namespace llvm;
using namespace llvm::object;
namespace llvm {
class RuntimeDyldMachO : public RuntimeDyldImpl {
-private:
-
- /// Write the least significant 'Size' bytes in 'Value' out at the address
- /// pointed to by Addr. Check for overflow.
- bool applyRelocationValue(uint8_t *Addr, uint64_t Value, unsigned Size) {
- for (unsigned i = 0; i < Size; ++i) {
- *Addr++ = (uint8_t)Value;
- Value >>= 8;
- }
-
- if (Value) // Catch overflow
- return Error("Relocation out of range.");
-
- return false;
- }
-
- bool resolveI386Relocation(const RelocationEntry &RE, uint64_t Value);
- bool resolveX86_64Relocation(const RelocationEntry &RE, uint64_t Value);
- bool resolveARMRelocation(const RelocationEntry &RE, uint64_t Value);
- bool resolveARM64Relocation(const RelocationEntry &RE, uint64_t Value);
-
- // Populate stubs in __jump_table section.
- void populateJumpTable(MachOObjectFile &Obj, const SectionRef &JTSection,
- unsigned JTSectionID);
-
- // Populate __pointers section.
- void populatePointersSection(MachOObjectFile &Obj, const SectionRef &PTSection,
- unsigned PTSectionID);
-
- unsigned getMaxStubSize() override {
- if (Arch == Triple::arm || Arch == Triple::thumb)
- return 8; // 32-bit instruction and 32-bit address
- else if (Arch == Triple::x86_64)
- return 8; // GOT entry
- else
- return 0;
- }
-
- unsigned getStubAlignment() override { return 1; }
-
- relocation_iterator processSECTDIFFRelocation(
- unsigned SectionID,
- relocation_iterator RelI,
- ObjectImage &ObjImg,
- ObjSectionToIDMap &ObjSectionToID);
+protected:
+ struct SectionOffsetPair {
+ unsigned SectionID;
+ uint64_t Offset;
+ };
struct EHFrameRelatedSections {
EHFrameRelatedSections()
: EHFrameSID(RTDYLD_INVALID_SECTION_ID),
TextSID(RTDYLD_INVALID_SECTION_ID),
ExceptTabSID(RTDYLD_INVALID_SECTION_ID) {}
+
EHFrameRelatedSections(SID EH, SID T, SID Ex)
: EHFrameSID(EH), TextSID(T), ExceptTabSID(Ex) {}
SID EHFrameSID;
// EH frame sections with the memory manager.
SmallVector<EHFrameRelatedSections, 2> UnregisteredEHFrameSections;
-public:
RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
- void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override;
- relocation_iterator
- processRelocationRef(unsigned SectionID, relocation_iterator RelI,
- ObjectImage &Obj, ObjSectionToIDMap &ObjSectionToID,
- const SymbolTableMap &Symbols, StubMap &Stubs) override;
- bool isCompatibleFormat(const ObjectBuffer *Buffer) const override;
- bool isCompatibleFile(const object::ObjectFile *Obj) const override;
- void registerEHFrames() override;
- void finalizeLoad(ObjectImage &ObjImg,
- ObjSectionToIDMap &SectionMap) override;
-
- static ObjectImage *createObjectImage(ObjectBuffer *InputBuffer) {
- return new ObjectImageCommon(InputBuffer);
+ /// This convenience method uses memcpy to extract a contiguous addend (the
+ /// addend size and offset are taken from the corresponding fields of the RE).
+ int64_t memcpyAddend(const RelocationEntry &RE) const;
+
+ /// Given a relocation_iterator for a non-scattered relocation, construct a
+ /// RelocationEntry and fill in the common fields. The 'Addend' field is *not*
+ /// filled in, since immediate encodings are highly target/opcode specific.
+ /// For targets/opcodes with simple, contiguous immediates (e.g. X86) the
+ /// memcpyAddend method can be used to read the immediate.
+ RelocationEntry getRelocationEntry(unsigned SectionID,
+ const ObjectFile &BaseTObj,
+ const relocation_iterator &RI) const {
+ const MachOObjectFile &Obj =
+ static_cast<const MachOObjectFile &>(BaseTObj);
+ MachO::any_relocation_info RelInfo =
+ Obj.getRelocation(RI->getRawDataRefImpl());
+
+ bool IsPCRel = Obj.getAnyRelocationPCRel(RelInfo);
+ unsigned Size = Obj.getAnyRelocationLength(RelInfo);
+ uint64_t Offset;
+ RI->getOffset(Offset);
+ MachO::RelocationInfoType RelType =
+ static_cast<MachO::RelocationInfoType>(Obj.getAnyRelocationType(RelInfo));
+
+ return RelocationEntry(SectionID, Offset, RelType, 0, IsPCRel, Size);
}
- static ObjectImage *
- createObjectImageFromFile(std::unique_ptr<object::ObjectFile> InputObject) {
- return new ObjectImageCommon(std::move(InputObject));
- }
+ /// Construct a RelocationValueRef representing the relocation target.
+ /// For Symbols in known sections, this will return a RelocationValueRef
+ /// representing a (SectionID, Offset) pair.
+ /// For Symbols whose section is not known, this will return a
+ /// (SymbolName, Offset) pair, where the Offset is taken from the instruction
+ /// immediate (held in RE.Addend).
+ /// In both cases the Addend field is *NOT* fixed up to be PC-relative. That
+ /// should be done by the caller where appropriate by calling makePCRel on
+ /// the RelocationValueRef.
+ RelocationValueRef getRelocationValueRef(const ObjectFile &BaseTObj,
+ const relocation_iterator &RI,
+ const RelocationEntry &RE,
+ ObjSectionToIDMap &ObjSectionToID);
+
+ /// Make the RelocationValueRef addend PC-relative.
+ void makeValueAddendPCRel(RelocationValueRef &Value,
+ const ObjectFile &BaseTObj,
+ const relocation_iterator &RI,
+ unsigned OffsetToNextPC);
+
+ /// Dump information about the relocation entry (RE) and resolved value.
+ void dumpRelocationToResolve(const RelocationEntry &RE, uint64_t Value) const;
+
+ // Return a section iterator for the section containing the given address.
+ static section_iterator getSectionByAddress(const MachOObjectFile &Obj,
+ uint64_t Addr);
+
+
+ // Populate __pointers section.
+ void populateIndirectSymbolPointersSection(const MachOObjectFile &Obj,
+ const SectionRef &PTSection,
+ unsigned PTSectionID);
+
+public:
+
+ /// Create a RuntimeDyldMachO instance for the given target architecture.
+ static std::unique_ptr<RuntimeDyldMachO> create(Triple::ArchType Arch,
+ RTDyldMemoryManager *mm);
+
+ std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
+ loadObject(const object::ObjectFile &O) override;
+
+ SectionEntry &getSection(unsigned SectionID) { return Sections[SectionID]; }
+
+ bool isCompatibleFile(const object::ObjectFile &Obj) const override;
+};
+
+/// RuntimeDyldMachOTarget - Templated base class for generic MachO linker
+/// algorithms and data structures.
+///
+/// Concrete, target specific sub-classes can be accessed via the impl()
+/// methods. (i.e. the RuntimeDyldMachO hierarchy uses the Curiously
+/// Recurring Template Idiom). Concrete subclasses for each target
+/// can be found in ./Targets.
+template <typename Impl>
+class RuntimeDyldMachOCRTPBase : public RuntimeDyldMachO {
+private:
+ Impl &impl() { return static_cast<Impl &>(*this); }
+ const Impl &impl() const { return static_cast<const Impl &>(*this); }
+
+ unsigned char *processFDE(unsigned char *P, int64_t DeltaForText,
+ int64_t DeltaForEH);
+
+public:
+ RuntimeDyldMachOCRTPBase(RTDyldMemoryManager *mm) : RuntimeDyldMachO(mm) {}
+
+ void finalizeLoad(const ObjectFile &Obj,
+ ObjSectionToIDMap &SectionMap) override;
+ void registerEHFrames() override;
};
} // end namespace llvm
+#undef DEBUG_TYPE
+
#endif
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