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//===- lib/MC/MCMachOStreamer.cpp - Mach-O Object Output ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
namespace {
class MCMachOStreamer : public MCStreamer {
MCAssembler Assembler;
MCSectionData *CurSectionData;
DenseMap<const MCSection*, MCSectionData*> SectionMap;
DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap;
private:
MCFragment *getCurrentFragment() const {
assert(CurSectionData && "No current section!");
if (!CurSectionData->empty())
return &CurSectionData->getFragmentList().back();
return 0;
}
MCSymbolData &getSymbolData(MCSymbol &Symbol) {
MCSymbolData *&Entry = SymbolMap[&Symbol];
if (!Entry)
Entry = new MCSymbolData(Symbol, 0, 0, &Assembler);
return *Entry;
}
public:
MCMachOStreamer(MCContext &Context, raw_ostream &_OS)
: MCStreamer(Context), Assembler(_OS), CurSectionData(0) {}
~MCMachOStreamer() {}
/// @name MCStreamer Interface
/// @{
virtual void SwitchSection(const MCSection *Section);
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitAssemblerFlag(AssemblerFlag Flag);
virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
bool MakeAbsolute = false);
virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
virtual void EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value);
virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
unsigned Pow2Alignment, bool IsLocal);
virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = NULL,
unsigned Size = 0, unsigned Pow2Alignment = 0);
virtual void EmitBytes(const StringRef &Data);
virtual void EmitValue(const MCValue &Value, unsigned Size);
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
unsigned ValueSize = 1,
unsigned MaxBytesToEmit = 0);
virtual void EmitValueToOffset(const MCValue &Offset,
unsigned char Value = 0);
virtual void EmitInstruction(const MCInst &Inst);
virtual void Finish();
/// @}
};
} // end anonymous namespace.
void MCMachOStreamer::SwitchSection(const MCSection *Section) {
assert(Section && "Cannot switch to a null section!");
// If already in this section, then this is a noop.
if (Section == CurSection) return;
CurSection = Section;
MCSectionData *&Entry = SectionMap[Section];
if (!Entry)
Entry = new MCSectionData(*Section, &Assembler);
CurSectionData = Entry;
}
void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
if (!F)
F = new MCDataFragment(CurSectionData);
MCSymbolData &SD = getSymbolData(*Symbol);
assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
SD.setFragment(F);
SD.setOffset(F->getContents().size());
Symbol->setSection(*CurSection);
}
void MCMachOStreamer::EmitAssemblerFlag(AssemblerFlag Flag) {
llvm_unreachable("FIXME: Not yet implemented!");
}
void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol,
const MCValue &Value,
bool MakeAbsolute) {
// Only absolute symbols can be redefined.
assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
"Cannot define a symbol twice!");
llvm_unreachable("FIXME: Not yet implemented!");
}
void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
SymbolAttr Attribute) {
switch (Attribute) {
default:
llvm_unreachable("FIXME: Not yet implemented!");
case MCStreamer::Global:
getSymbolData(*Symbol).setExternal(true);
break;
}
}
void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
llvm_unreachable("FIXME: Not yet implemented!");
}
void MCMachOStreamer::EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value) {
llvm_unreachable("FIXME: Not yet implemented!");
}
void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
unsigned Pow2Alignment,
bool IsLocal) {
llvm_unreachable("FIXME: Not yet implemented!");
}
void MCMachOStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
unsigned Size, unsigned Pow2Alignment) {
llvm_unreachable("FIXME: Not yet implemented!");
}
void MCMachOStreamer::EmitBytes(const StringRef &Data) {
MCDataFragment *DF = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
if (!DF)
DF = new MCDataFragment(CurSectionData);
DF->getContents().append(Data.begin(), Data.end());
}
void MCMachOStreamer::EmitValue(const MCValue &Value, unsigned Size) {
new MCFillFragment(Value, Size, 1, CurSectionData);
}
void MCMachOStreamer::EmitValueToAlignment(unsigned ByteAlignment,
int64_t Value, unsigned ValueSize,
unsigned MaxBytesToEmit) {
if (MaxBytesToEmit == 0)
MaxBytesToEmit = ByteAlignment;
new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
CurSectionData);
// Update the maximum alignment on the current section if necessary.
if (ByteAlignment > CurSectionData->getAlignment())
CurSectionData->setAlignment(ByteAlignment);
}
void MCMachOStreamer::EmitValueToOffset(const MCValue &Offset,
unsigned char Value) {
new MCOrgFragment(Offset, Value, CurSectionData);
}
void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
llvm_unreachable("FIXME: Not yet implemented!");
}
void MCMachOStreamer::Finish() {
Assembler.Finish();
}
MCStreamer *llvm::createMachOStreamer(MCContext &Context, raw_ostream &OS) {
return new MCMachOStreamer(Context, OS);
}
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