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c5252da873
* wrap code blocks in \code ... \endcode; * refer to parameter names in paragraphs correctly (\arg is not what most people want -- it starts a new paragraph); * use \param instead of \arg to document parameters in order to be consistent with the rest of the codebase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163902 91177308-0d34-0410-b5e6-96231b3b80d8
263 lines
9.1 KiB
C++
263 lines
9.1 KiB
C++
//===-- llvm/MC/MCMachObjectWriter.h - Mach Object Writer -------*- 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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#ifndef LLVM_MC_MCMACHOBJECTWRITER_H
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#define LLVM_MC_MCMACHOBJECTWRITER_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/Object/MachOFormat.h"
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#include "llvm/Support/DataTypes.h"
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#include <vector>
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namespace llvm {
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class MCSectionData;
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class MachObjectWriter;
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class MCMachObjectTargetWriter {
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const unsigned Is64Bit : 1;
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const uint32_t CPUType;
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const uint32_t CPUSubtype;
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// FIXME: Remove this, we should just always use it once we no longer care
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// about Darwin 'as' compatibility.
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const unsigned UseAggressiveSymbolFolding : 1;
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unsigned LocalDifference_RIT;
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protected:
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MCMachObjectTargetWriter(bool Is64Bit_, uint32_t CPUType_,
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uint32_t CPUSubtype_,
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bool UseAggressiveSymbolFolding_ = false);
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void setLocalDifferenceRelocationType(unsigned Type) {
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LocalDifference_RIT = Type;
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}
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public:
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virtual ~MCMachObjectTargetWriter();
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/// @name Accessors
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/// @{
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bool is64Bit() const { return Is64Bit; }
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bool useAggressiveSymbolFolding() const { return UseAggressiveSymbolFolding; }
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uint32_t getCPUType() const { return CPUType; }
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uint32_t getCPUSubtype() const { return CPUSubtype; }
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unsigned getLocalDifferenceRelocationType() const {
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return LocalDifference_RIT;
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}
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/// @}
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/// @name API
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/// @{
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virtual void RecordRelocation(MachObjectWriter *Writer,
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const MCAssembler &Asm,
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const MCAsmLayout &Layout,
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const MCFragment *Fragment,
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const MCFixup &Fixup,
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MCValue Target,
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uint64_t &FixedValue) = 0;
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/// @}
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};
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class MachObjectWriter : public MCObjectWriter {
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/// MachSymbolData - Helper struct for containing some precomputed information
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/// on symbols.
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struct MachSymbolData {
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MCSymbolData *SymbolData;
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uint64_t StringIndex;
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uint8_t SectionIndex;
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// Support lexicographic sorting.
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bool operator<(const MachSymbolData &RHS) const;
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};
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/// The target specific Mach-O writer instance.
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llvm::OwningPtr<MCMachObjectTargetWriter> TargetObjectWriter;
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/// @name Relocation Data
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/// @{
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llvm::DenseMap<const MCSectionData*,
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std::vector<object::macho::RelocationEntry> > Relocations;
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llvm::DenseMap<const MCSectionData*, unsigned> IndirectSymBase;
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/// @}
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/// @name Symbol Table Data
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/// @{
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SmallString<256> StringTable;
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std::vector<MachSymbolData> LocalSymbolData;
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std::vector<MachSymbolData> ExternalSymbolData;
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std::vector<MachSymbolData> UndefinedSymbolData;
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/// @}
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public:
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MachObjectWriter(MCMachObjectTargetWriter *MOTW, raw_ostream &_OS,
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bool _IsLittleEndian)
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: MCObjectWriter(_OS, _IsLittleEndian), TargetObjectWriter(MOTW) {
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}
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/// @name Utility Methods
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/// @{
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bool isFixupKindPCRel(const MCAssembler &Asm, unsigned Kind);
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SectionAddrMap SectionAddress;
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SectionAddrMap &getSectionAddressMap() { return SectionAddress; }
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uint64_t getSectionAddress(const MCSectionData* SD) const {
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return SectionAddress.lookup(SD);
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}
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uint64_t getSymbolAddress(const MCSymbolData* SD,
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const MCAsmLayout &Layout) const;
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uint64_t getFragmentAddress(const MCFragment *Fragment,
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const MCAsmLayout &Layout) const;
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uint64_t getPaddingSize(const MCSectionData *SD,
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const MCAsmLayout &Layout) const;
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bool doesSymbolRequireExternRelocation(const MCSymbolData *SD);
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/// @}
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/// @name Target Writer Proxy Accessors
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/// @{
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bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
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bool isARM() const {
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uint32_t CPUType = TargetObjectWriter->getCPUType() &
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~object::mach::CTFM_ArchMask;
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return CPUType == object::mach::CTM_ARM;
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}
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/// @}
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void WriteHeader(unsigned NumLoadCommands, unsigned LoadCommandsSize,
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bool SubsectionsViaSymbols);
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/// WriteSegmentLoadCommand - Write a segment load command.
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///
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/// \param NumSections The number of sections in this segment.
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/// \param SectionDataSize The total size of the sections.
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void WriteSegmentLoadCommand(unsigned NumSections,
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uint64_t VMSize,
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uint64_t SectionDataStartOffset,
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uint64_t SectionDataSize);
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void WriteSection(const MCAssembler &Asm, const MCAsmLayout &Layout,
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const MCSectionData &SD, uint64_t FileOffset,
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uint64_t RelocationsStart, unsigned NumRelocations);
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void WriteSymtabLoadCommand(uint32_t SymbolOffset, uint32_t NumSymbols,
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uint32_t StringTableOffset,
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uint32_t StringTableSize);
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void WriteDysymtabLoadCommand(uint32_t FirstLocalSymbol,
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uint32_t NumLocalSymbols,
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uint32_t FirstExternalSymbol,
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uint32_t NumExternalSymbols,
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uint32_t FirstUndefinedSymbol,
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uint32_t NumUndefinedSymbols,
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uint32_t IndirectSymbolOffset,
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uint32_t NumIndirectSymbols);
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void WriteNlist(MachSymbolData &MSD, const MCAsmLayout &Layout);
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void WriteLinkeditLoadCommand(uint32_t Type, uint32_t DataOffset,
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uint32_t DataSize);
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// FIXME: We really need to improve the relocation validation. Basically, we
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// want to implement a separate computation which evaluates the relocation
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// entry as the linker would, and verifies that the resultant fixup value is
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// exactly what the encoder wanted. This will catch several classes of
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// problems:
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//
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// - Relocation entry bugs, the two algorithms are unlikely to have the same
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// exact bug.
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//
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// - Relaxation issues, where we forget to relax something.
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//
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// - Input errors, where something cannot be correctly encoded. 'as' allows
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// these through in many cases.
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void addRelocation(const MCSectionData *SD,
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object::macho::RelocationEntry &MRE) {
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Relocations[SD].push_back(MRE);
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}
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void RecordScatteredRelocation(const MCAssembler &Asm,
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const MCAsmLayout &Layout,
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const MCFragment *Fragment,
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const MCFixup &Fixup, MCValue Target,
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unsigned Log2Size,
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uint64_t &FixedValue);
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void RecordTLVPRelocation(const MCAssembler &Asm,
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const MCAsmLayout &Layout,
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const MCFragment *Fragment,
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const MCFixup &Fixup, MCValue Target,
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uint64_t &FixedValue);
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void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,
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const MCFragment *Fragment, const MCFixup &Fixup,
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MCValue Target, uint64_t &FixedValue);
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void BindIndirectSymbols(MCAssembler &Asm);
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/// ComputeSymbolTable - Compute the symbol table data
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///
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/// \param StringTable [out] - The string table data.
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/// \param StringIndexMap [out] - Map from symbol names to offsets in the
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/// string table.
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void ComputeSymbolTable(MCAssembler &Asm, SmallString<256> &StringTable,
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std::vector<MachSymbolData> &LocalSymbolData,
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std::vector<MachSymbolData> &ExternalSymbolData,
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std::vector<MachSymbolData> &UndefinedSymbolData);
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void computeSectionAddresses(const MCAssembler &Asm,
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const MCAsmLayout &Layout);
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void markAbsoluteVariableSymbols(MCAssembler &Asm,
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const MCAsmLayout &Layout);
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void ExecutePostLayoutBinding(MCAssembler &Asm, const MCAsmLayout &Layout);
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virtual bool IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
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const MCSymbolData &DataA,
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const MCFragment &FB,
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bool InSet,
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bool IsPCRel) const;
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void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout);
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};
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/// \brief Construct a new Mach-O writer instance.
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///
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/// This routine takes ownership of the target writer subclass.
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///
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/// \param MOTW - The target specific Mach-O writer subclass.
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/// \param OS - The stream to write to.
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/// \returns The constructed object writer.
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MCObjectWriter *createMachObjectWriter(MCMachObjectTargetWriter *MOTW,
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raw_ostream &OS, bool IsLittleEndian);
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} // End llvm namespace
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#endif
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