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https://github.com/c64scene-ar/llvm-6502.git
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85f2ecc697
actuall addresses in a .o file, so it is better to let the MachO writer compute it. This is good for two reasons. First, areas that shouldn't care about addresses now don't have access to it. Second, the layout of each section is independent. I should use this in a subsequent commit to speed it up. Most of the patch is just removing the section address computation. The two interesting parts are the change on how we handle padding in the end of sections and how MachO can get the address of a-b when a and b are in different sections. Since now the expression evaluation normally doesn't know the section address, it will think that a-b needs relocation and let the MachO writer know. Once it has computed the section addresses, it calls back the expression evaluation with the section addresses to resolve these expressions. The remaining problem is the handling of padding. Currently it will create a special alignment fragment at the end. Since that fragment doesn't update the alignment of the section, it needs the real address to be computed. Since now the layout will not compute a-b with a and b in different sections, the only effect that the special alignment fragment has is update the address size of the section. This can also be done by the MachO writer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121076 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
//===- MCObjectStreamer.h - MCStreamer Object File Interface ----*- 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_MCOBJECTSTREAMER_H
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#define LLVM_MC_MCOBJECTSTREAMER_H
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#include "llvm/MC/MCStreamer.h"
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namespace llvm {
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class MCAssembler;
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class MCCodeEmitter;
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class MCSectionData;
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class MCExpr;
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class MCFragment;
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class MCDataFragment;
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class TargetAsmBackend;
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class raw_ostream;
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/// \brief Streaming object file generation interface.
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///
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/// This class provides an implementation of the MCStreamer interface which is
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/// suitable for use with the assembler backend. Specific object file formats
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/// are expected to subclass this interface to implement directives specific
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/// to that file format or custom semantics expected by the object writer
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/// implementation.
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class MCObjectStreamer : public MCStreamer {
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MCAssembler *Assembler;
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MCSectionData *CurSectionData;
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virtual void EmitInstToData(const MCInst &Inst) = 0;
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protected:
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MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
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raw_ostream &_OS, MCCodeEmitter *_Emitter);
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~MCObjectStreamer();
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MCSectionData *getCurrentSectionData() const {
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return CurSectionData;
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}
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MCFragment *getCurrentFragment() const;
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/// Get a data fragment to write into, creating a new one if the current
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/// fragment is not a data fragment.
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MCDataFragment *getOrCreateDataFragment() const;
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const MCExpr *AddValueSymbols(const MCExpr *Value);
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public:
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MCAssembler &getAssembler() { return *Assembler; }
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/// @name MCStreamer Interface
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/// @{
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virtual void EmitLabel(MCSymbol *Symbol);
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virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
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virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
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virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
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virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
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virtual void SwitchSection(const MCSection *Section);
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virtual void EmitInstruction(const MCInst &Inst);
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virtual void EmitInstToFragment(const MCInst &Inst);
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virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
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virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
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const MCSymbol *LastLabel,
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const MCSymbol *Label);
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virtual void Finish();
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/// @}
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};
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} // end namespace llvm
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#endif
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