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https://github.com/c64scene-ar/llvm-6502.git
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9428f184be
Before when deciding if we needed a relocation in A-B, we wore only checking if A was weak. This fixes the asymmetry. The "InSet" argument should probably be renamed to "ForValue", since InSet is very MachO specific, but doing so in this patch would make it hard to read. This fixes PR22815. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234165 91177308-0d34-0410-b5e6-96231b3b80d8
287 lines
9.7 KiB
C++
287 lines
9.7 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/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/MC/StringTableBuilder.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/MachO.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 Lifetime Management
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/// @{
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virtual void reset() {};
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/// @}
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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, 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) = 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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std::unique_ptr<MCMachObjectTargetWriter> TargetObjectWriter;
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/// @name Relocation Data
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/// @{
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struct RelAndSymbol {
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const MCSymbolData *Sym;
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MachO::any_relocation_info MRE;
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RelAndSymbol(const MCSymbolData *Sym, const MachO::any_relocation_info &MRE)
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: Sym(Sym), MRE(MRE) {}
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};
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llvm::DenseMap<const MCSectionData *, std::vector<RelAndSymbol>> 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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StringTableBuilder 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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MachSymbolData *findSymbolData(const MCSymbol &Sym);
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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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/// @name Lifetime management Methods
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/// @{
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void reset() override;
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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 isX86_64() const {
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uint32_t CPUType = TargetObjectWriter->getCPUType();
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return CPUType == MachO::CPU_TYPE_X86_64;
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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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void WriteLinkerOptionsLoadCommand(const std::vector<std::string> &Options);
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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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// Add a relocation to be output in the object file. At the time this is
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// called, the symbol indexes are not know, so if the relocation refers
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// to a symbol it should be passed as \p RelSymbol so that it can be updated
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// afterwards. If the relocation doesn't refer to a symbol, nullptr should be
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// used.
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void addRelocation(const MCSymbolData *RelSymbol, const MCSectionData *SD,
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MachO::any_relocation_info &MRE) {
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RelAndSymbol P(RelSymbol, MRE);
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Relocations[SD].push_back(P);
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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(MCAssembler &Asm, const MCAsmLayout &Layout,
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const MCFragment *Fragment, const MCFixup &Fixup,
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MCValue Target, bool &IsPCRel,
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uint64_t &FixedValue) override;
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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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void ComputeSymbolTable(MCAssembler &Asm,
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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 ExecutePostLayoutBinding(MCAssembler &Asm,
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const MCAsmLayout &Layout) override;
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bool IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
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const MCSymbolData &DataA,
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const MCSymbolData *DataB,
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const MCFragment &FB,
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bool InSet,
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bool IsPCRel) const override;
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void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
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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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