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https://github.com/c64scene-ar/llvm-6502.git
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5d4918dbd1
foo = a - b .long foo instead of just .long a - b First, on darwin9 64 bits the assembler produces the wrong result. Second, if "a" is the end of the section all darwin assemblers (9, 10 and mc) will not consider a - b to be a constant but will if the dummy foo is created. Split how we handle these cases. The first one is something MC should take care of. The second one has to be handled by the caller. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120889 91177308-0d34-0410-b5e6-96231b3b80d8
107 lines
4.0 KiB
C++
107 lines
4.0 KiB
C++
//===- lib/MC/MCNullStreamer.cpp - Dummy Streamer Implementation ----------===//
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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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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSymbol.h"
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using namespace llvm;
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namespace {
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class MCNullStreamer : public MCStreamer {
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public:
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MCNullStreamer(MCContext &Context) : MCStreamer(Context) {}
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/// @name MCStreamer Interface
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/// @{
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virtual void InitSections() {
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}
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virtual void SwitchSection(const MCSection *Section) {
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PrevSection = CurSection;
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CurSection = Section;
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}
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virtual void EmitLabel(MCSymbol *Symbol) {
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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assert(CurSection && "Cannot emit before setting section!");
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Symbol->setSection(*CurSection);
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}
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virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
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virtual void EmitThumbFunc(MCSymbol *Func) {}
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virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
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virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol){}
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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 EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute){}
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virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
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virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
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virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
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virtual void EmitCOFFSymbolType(int Type) {}
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virtual void EndCOFFSymbolDef() {}
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virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
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virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {}
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virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {}
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virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
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unsigned Size = 0, unsigned ByteAlignment = 0) {}
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virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment) {}
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virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {}
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virtual void EmitValue(const MCExpr *Value, unsigned Size,
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unsigned AddrSpace) {}
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virtual void EmitULEB128Value(const MCExpr *Value,
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unsigned AddrSpace = 0) {}
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virtual void EmitSLEB128Value(const MCExpr *Value,
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unsigned AddrSpace = 0) {}
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virtual void EmitGPRel32Value(const MCExpr *Value) {}
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virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
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unsigned ValueSize = 1,
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unsigned MaxBytesToEmit = 0) {}
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virtual void EmitCodeAlignment(unsigned ByteAlignment,
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unsigned MaxBytesToEmit = 0) {}
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virtual void EmitValueToOffset(const MCExpr *Offset,
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unsigned char Value = 0) {}
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virtual void EmitFileDirective(StringRef Filename) {}
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virtual bool EmitDwarfFileDirective(unsigned FileNo,StringRef Filename) {
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return false;
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}
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virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
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unsigned Column, unsigned Flags,
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unsigned Isa, unsigned Discriminator) {}
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virtual void EmitInstruction(const MCInst &Inst) {}
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virtual void Finish() {}
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/// @}
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};
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}
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MCStreamer *llvm::createNullStreamer(MCContext &Context) {
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return new MCNullStreamer(Context);
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}
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