forked from OSchip/llvm-project
141 lines
4.6 KiB
C++
141 lines
4.6 KiB
C++
//===- lib/MC/MCELFStreamer.h - ELF Object Output -------------------------===//
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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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//
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// This file assembles .s files and emits ELF .o object files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCELFSTREAMER_H
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#define LLVM_MC_MCELFSTREAMER_H
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCObjectStreamer.h"
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#include "llvm/MC/MCSectionELF.h"
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namespace llvm {
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class MCELFStreamer : public MCObjectStreamer {
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public:
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MCELFStreamer(MCContext &Context, TargetAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter)
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: MCObjectStreamer(Context, TAB, OS, Emitter) {}
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MCELFStreamer(MCContext &Context, TargetAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter,
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MCAssembler *Assembler)
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: MCObjectStreamer(Context, TAB, OS, Emitter, Assembler) {}
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~MCELFStreamer() {}
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/// @name MCStreamer Interface
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/// @{
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virtual void InitSections();
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virtual void ChangeSection(const MCSection *Section);
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virtual void EmitLabel(MCSymbol *Symbol);
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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 EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
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virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment);
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virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitCOFFSymbolStorageClass(int StorageClass) {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitCOFFSymbolType(int Type) {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EndCOFFSymbolDef() {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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SD.setSize(Value);
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}
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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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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment = 0) {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
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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 EmitFileDirective(StringRef Filename);
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virtual void Finish();
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private:
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virtual void EmitInstToFragment(const MCInst &Inst);
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virtual void EmitInstToData(const MCInst &Inst);
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void fixSymbolsInTLSFixups(const MCExpr *expr);
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struct LocalCommon {
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MCSymbolData *SD;
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uint64_t Size;
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unsigned ByteAlignment;
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};
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std::vector<LocalCommon> LocalCommons;
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SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet;
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/// @}
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void SetSection(StringRef Section, unsigned Type, unsigned Flags,
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SectionKind Kind) {
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SwitchSection(getContext().getELFSection(Section, Type, Flags, Kind));
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}
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void SetSectionData() {
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SetSection(".data", ELF::SHT_PROGBITS,
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ELF::SHF_WRITE |ELF::SHF_ALLOC,
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SectionKind::getDataRel());
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EmitCodeAlignment(4, 0);
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}
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void SetSectionText() {
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SetSection(".text", ELF::SHT_PROGBITS,
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ELF::SHF_EXECINSTR |
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ELF::SHF_ALLOC, SectionKind::getText());
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EmitCodeAlignment(4, 0);
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}
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void SetSectionBss() {
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SetSection(".bss", ELF::SHT_NOBITS,
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ELF::SHF_WRITE |
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ELF::SHF_ALLOC, SectionKind::getBSS());
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EmitCodeAlignment(4, 0);
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}
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};
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} // end llvm namespace
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#endif
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