forked from OSchip/llvm-project
142 lines
4.7 KiB
C++
142 lines
4.7 KiB
C++
//===- lib/MC/MCELFStreamer.h - ELF Object Output -------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file assembles .s files and emits ELF .o object files.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_MC_MCELFSTREAMER_H
|
|
#define LLVM_MC_MCELFSTREAMER_H
|
|
|
|
#include "llvm/ADT/SmallPtrSet.h"
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/MC/MCAssembler.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCObjectStreamer.h"
|
|
#include "llvm/MC/MCSectionELF.h"
|
|
|
|
namespace llvm {
|
|
|
|
class MCELFStreamer : public MCObjectStreamer {
|
|
public:
|
|
MCELFStreamer(MCContext &Context, MCAsmBackend &TAB,
|
|
raw_ostream &OS, MCCodeEmitter *Emitter)
|
|
: MCObjectStreamer(Context, TAB, OS, Emitter) {}
|
|
|
|
MCELFStreamer(MCContext &Context, MCAsmBackend &TAB,
|
|
raw_ostream &OS, MCCodeEmitter *Emitter,
|
|
MCAssembler *Assembler)
|
|
: MCObjectStreamer(Context, TAB, OS, Emitter, Assembler) {}
|
|
|
|
|
|
~MCELFStreamer() {}
|
|
|
|
/// @name MCStreamer Interface
|
|
/// @{
|
|
|
|
virtual void InitSections();
|
|
virtual void ChangeSection(const MCSection *Section);
|
|
virtual void EmitLabel(MCSymbol *Symbol);
|
|
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
|
|
virtual void EmitThumbFunc(MCSymbol *Func);
|
|
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
|
|
virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
|
|
virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
|
|
virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
|
|
assert(0 && "ELF doesn't support this directive");
|
|
}
|
|
virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment);
|
|
virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {
|
|
assert(0 && "ELF doesn't support this directive");
|
|
}
|
|
|
|
virtual void EmitCOFFSymbolStorageClass(int StorageClass) {
|
|
assert(0 && "ELF doesn't support this directive");
|
|
}
|
|
|
|
virtual void EmitCOFFSymbolType(int Type) {
|
|
assert(0 && "ELF doesn't support this directive");
|
|
}
|
|
|
|
virtual void EndCOFFSymbolDef() {
|
|
assert(0 && "ELF doesn't support this directive");
|
|
}
|
|
|
|
virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
SD.setSize(Value);
|
|
}
|
|
|
|
virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment);
|
|
|
|
virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
|
|
unsigned Size = 0, unsigned ByteAlignment = 0) {
|
|
assert(0 && "ELF doesn't support this directive");
|
|
}
|
|
virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment = 0) {
|
|
assert(0 && "ELF doesn't support this directive");
|
|
}
|
|
virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
|
|
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
|
|
unsigned ValueSize = 1,
|
|
unsigned MaxBytesToEmit = 0);
|
|
virtual void EmitCodeAlignment(unsigned ByteAlignment,
|
|
unsigned MaxBytesToEmit = 0);
|
|
|
|
virtual void EmitFileDirective(StringRef Filename);
|
|
|
|
virtual void Finish();
|
|
|
|
private:
|
|
virtual void EmitInstToFragment(const MCInst &Inst);
|
|
virtual void EmitInstToData(const MCInst &Inst);
|
|
|
|
void fixSymbolsInTLSFixups(const MCExpr *expr);
|
|
|
|
struct LocalCommon {
|
|
MCSymbolData *SD;
|
|
uint64_t Size;
|
|
unsigned ByteAlignment;
|
|
};
|
|
std::vector<LocalCommon> LocalCommons;
|
|
|
|
SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet;
|
|
/// @}
|
|
void SetSection(StringRef Section, unsigned Type, unsigned Flags,
|
|
SectionKind Kind) {
|
|
SwitchSection(getContext().getELFSection(Section, Type, Flags, Kind));
|
|
}
|
|
|
|
void SetSectionData() {
|
|
SetSection(".data", ELF::SHT_PROGBITS,
|
|
ELF::SHF_WRITE |ELF::SHF_ALLOC,
|
|
SectionKind::getDataRel());
|
|
EmitCodeAlignment(4, 0);
|
|
}
|
|
void SetSectionText() {
|
|
SetSection(".text", ELF::SHT_PROGBITS,
|
|
ELF::SHF_EXECINSTR |
|
|
ELF::SHF_ALLOC, SectionKind::getText());
|
|
EmitCodeAlignment(4, 0);
|
|
}
|
|
void SetSectionBss() {
|
|
SetSection(".bss", ELF::SHT_NOBITS,
|
|
ELF::SHF_WRITE |
|
|
ELF::SHF_ALLOC, SectionKind::getBSS());
|
|
EmitCodeAlignment(4, 0);
|
|
}
|
|
};
|
|
|
|
} // end llvm namespace
|
|
|
|
#endif
|