#ifndef LLVM_MC_MCMACHOBJECTWRITER_H
#define LLVM_MC_MCMACHOBJECTWRITER_H
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/StringTableBuilder.h"
#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/MachO.h"
+#include <vector>
namespace llvm {
+class MachObjectWriter;
+
class MCMachObjectTargetWriter {
const unsigned Is64Bit : 1;
const uint32_t CPUType;
const uint32_t CPUSubtype;
+ unsigned LocalDifference_RIT;
protected:
MCMachObjectTargetWriter(bool Is64Bit_, uint32_t CPUType_,
uint32_t CPUSubtype_);
+ void setLocalDifferenceRelocationType(unsigned Type) {
+ LocalDifference_RIT = Type;
+ }
+
public:
virtual ~MCMachObjectTargetWriter();
- /// @name Accessors
+ /// \name Lifetime Management
+ /// @{
+
+ virtual void reset() {}
+
+ /// @}
+
+ /// \name Accessors
/// @{
bool is64Bit() const { return Is64Bit; }
uint32_t getCPUType() const { return CPUType; }
uint32_t getCPUSubtype() const { return CPUSubtype; }
+ unsigned getLocalDifferenceRelocationType() const {
+ return LocalDifference_RIT;
+ }
+
+ /// @}
+
+ /// \name API
+ /// @{
+
+ virtual void recordRelocation(MachObjectWriter *Writer, MCAssembler &Asm,
+ const MCAsmLayout &Layout,
+ const MCFragment *Fragment,
+ const MCFixup &Fixup, MCValue Target,
+ uint64_t &FixedValue) = 0;
+
+ /// @}
+};
+
+class MachObjectWriter : public MCObjectWriter {
+ /// Helper struct for containing some precomputed information on symbols.
+ struct MachSymbolData {
+ const MCSymbol *Symbol;
+ uint64_t StringIndex;
+ uint8_t SectionIndex;
+
+ // Support lexicographic sorting.
+ bool operator<(const MachSymbolData &RHS) const;
+ };
+
+ /// The target specific Mach-O writer instance.
+ std::unique_ptr<MCMachObjectTargetWriter> TargetObjectWriter;
+
+ /// \name Relocation Data
+ /// @{
+
+ struct RelAndSymbol {
+ const MCSymbol *Sym;
+ MachO::any_relocation_info MRE;
+ RelAndSymbol(const MCSymbol *Sym, const MachO::any_relocation_info &MRE)
+ : Sym(Sym), MRE(MRE) {}
+ };
+
+ llvm::DenseMap<const MCSection *, std::vector<RelAndSymbol>> Relocations;
+ llvm::DenseMap<const MCSection *, unsigned> IndirectSymBase;
+
+ SectionAddrMap SectionAddress;
+
+ /// @}
+ /// \name Symbol Table Data
+ /// @{
+
+ StringTableBuilder StringTable;
+ std::vector<MachSymbolData> LocalSymbolData;
+ std::vector<MachSymbolData> ExternalSymbolData;
+ std::vector<MachSymbolData> UndefinedSymbolData;
+
+ /// @}
+
+ MachSymbolData *findSymbolData(const MCSymbol &Sym);
+
+public:
+ MachObjectWriter(MCMachObjectTargetWriter *MOTW, raw_pwrite_stream &OS,
+ bool IsLittleEndian)
+ : MCObjectWriter(OS, IsLittleEndian), TargetObjectWriter(MOTW) {}
+
+ const MCSymbol &findAliasedSymbol(const MCSymbol &Sym) const;
+
+ /// \name Lifetime management Methods
+ /// @{
+
+ void reset() override;
+
+ /// @}
+
+ /// \name Utility Methods
+ /// @{
+
+ bool isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind);
+
+ SectionAddrMap &getSectionAddressMap() { return SectionAddress; }
+
+ uint64_t getSectionAddress(const MCSection *Sec) const {
+ return SectionAddress.lookup(Sec);
+ }
+ uint64_t getSymbolAddress(const MCSymbol &S, const MCAsmLayout &Layout) const;
+
+ uint64_t getFragmentAddress(const MCFragment *Fragment,
+ const MCAsmLayout &Layout) const;
+
+ uint64_t getPaddingSize(const MCSection *SD, const MCAsmLayout &Layout) const;
+
+ bool doesSymbolRequireExternRelocation(const MCSymbol &S);
/// @}
+
+ /// \name Target Writer Proxy Accessors
+ /// @{
+
+ bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
+ bool isX86_64() const {
+ uint32_t CPUType = TargetObjectWriter->getCPUType();
+ return CPUType == MachO::CPU_TYPE_X86_64;
+ }
+
+ /// @}
+
+ void writeHeader(unsigned NumLoadCommands, unsigned LoadCommandsSize,
+ bool SubsectionsViaSymbols);
+
+ /// Write a segment load command.
+ ///
+ /// \param NumSections The number of sections in this segment.
+ /// \param SectionDataSize The total size of the sections.
+ void writeSegmentLoadCommand(unsigned NumSections, uint64_t VMSize,
+ uint64_t SectionDataStartOffset,
+ uint64_t SectionDataSize);
+
+ void writeSection(const MCAssembler &Asm, const MCAsmLayout &Layout,
+ const MCSection &Sec, uint64_t FileOffset,
+ uint64_t RelocationsStart, unsigned NumRelocations);
+
+ void writeSymtabLoadCommand(uint32_t SymbolOffset, uint32_t NumSymbols,
+ uint32_t StringTableOffset,
+ uint32_t StringTableSize);
+
+ void writeDysymtabLoadCommand(
+ uint32_t FirstLocalSymbol, uint32_t NumLocalSymbols,
+ uint32_t FirstExternalSymbol, uint32_t NumExternalSymbols,
+ uint32_t FirstUndefinedSymbol, uint32_t NumUndefinedSymbols,
+ uint32_t IndirectSymbolOffset, uint32_t NumIndirectSymbols);
+
+ void writeNlist(MachSymbolData &MSD, const MCAsmLayout &Layout);
+
+ void writeLinkeditLoadCommand(uint32_t Type, uint32_t DataOffset,
+ uint32_t DataSize);
+
+ void writeLinkerOptionsLoadCommand(const std::vector<std::string> &Options);
+
+ // FIXME: We really need to improve the relocation validation. Basically, we
+ // want to implement a separate computation which evaluates the relocation
+ // entry as the linker would, and verifies that the resultant fixup value is
+ // exactly what the encoder wanted. This will catch several classes of
+ // problems:
+ //
+ // - Relocation entry bugs, the two algorithms are unlikely to have the same
+ // exact bug.
+ //
+ // - Relaxation issues, where we forget to relax something.
+ //
+ // - Input errors, where something cannot be correctly encoded. 'as' allows
+ // these through in many cases.
+
+ // Add a relocation to be output in the object file. At the time this is
+ // called, the symbol indexes are not know, so if the relocation refers
+ // to a symbol it should be passed as \p RelSymbol so that it can be updated
+ // afterwards. If the relocation doesn't refer to a symbol, nullptr should be
+ // used.
+ void addRelocation(const MCSymbol *RelSymbol, const MCSection *Sec,
+ MachO::any_relocation_info &MRE) {
+ RelAndSymbol P(RelSymbol, MRE);
+ Relocations[Sec].push_back(P);
+ }
+
+ void recordScatteredRelocation(const MCAssembler &Asm,
+ const MCAsmLayout &Layout,
+ const MCFragment *Fragment,
+ const MCFixup &Fixup, MCValue Target,
+ unsigned Log2Size, uint64_t &FixedValue);
+
+ void recordTLVPRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,
+ const MCFragment *Fragment, const MCFixup &Fixup,
+ MCValue Target, uint64_t &FixedValue);
+
+ void recordRelocation(MCAssembler &Asm, const MCAsmLayout &Layout,
+ const MCFragment *Fragment, const MCFixup &Fixup,
+ MCValue Target, bool &IsPCRel,
+ uint64_t &FixedValue) override;
+
+ void bindIndirectSymbols(MCAssembler &Asm);
+
+ /// Compute the symbol table data.
+ void computeSymbolTable(MCAssembler &Asm,
+ std::vector<MachSymbolData> &LocalSymbolData,
+ std::vector<MachSymbolData> &ExternalSymbolData,
+ std::vector<MachSymbolData> &UndefinedSymbolData);
+
+ void computeSectionAddresses(const MCAssembler &Asm,
+ const MCAsmLayout &Layout);
+
+ void executePostLayoutBinding(MCAssembler &Asm,
+ const MCAsmLayout &Layout) override;
+
+ bool isSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
+ const MCSymbol &SymA,
+ const MCFragment &FB, bool InSet,
+ bool IsPCRel) const override;
+
+ void writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
};
-/// \brief Construct a new Mach-O writer instance.
+/// Construct a new Mach-O writer instance.
///
/// This routine takes ownership of the target writer subclass.
///
/// \param OS - The stream to write to.
/// \returns The constructed object writer.
MCObjectWriter *createMachObjectWriter(MCMachObjectTargetWriter *MOTW,
- raw_ostream &OS, bool IsLittleEndian);
+ raw_pwrite_stream &OS,
+ bool IsLittleEndian);
} // End llvm namespace
projects / oota-llvm.git / blobdiff