#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
private:
MCAssembler Assembler;
-
MCCodeEmitter *Emitter;
-
MCSectionData *CurSectionData;
- DenseMap<const MCSection*, MCSectionData*> SectionMap;
-
- DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap;
-
private:
MCFragment *getCurrentFragment() const {
assert(CurSectionData && "No current section!");
return 0;
}
- MCSectionData &getSectionData(const MCSection &Section) {
- MCSectionData *&Entry = SectionMap[&Section];
-
- if (!Entry)
- Entry = new MCSectionData(Section, &Assembler);
-
- return *Entry;
- }
-
- 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, MCCodeEmitter *_Emitter)
- : MCStreamer(Context), Assembler(_OS), Emitter(_Emitter),
+ : MCStreamer(Context), Assembler(Context, _OS), Emitter(_Emitter),
CurSectionData(0) {}
~MCMachOStreamer() {}
- const MCValue &AddValueSymbols(const MCValue &Value) {
- if (Value.getSymA())
- getSymbolData(*const_cast<MCSymbol*>(Value.getSymA()));
- if (Value.getSymB())
- getSymbolData(*const_cast<MCSymbol*>(Value.getSymB()));
+ const MCExpr *AddValueSymbols(const MCExpr *Value) {
+ switch (Value->getKind()) {
+ case MCExpr::Target: assert(0 && "Can't handle target exprs yet!");
+ case MCExpr::Constant:
+ break;
+
+ case MCExpr::Binary: {
+ const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
+ AddValueSymbols(BE->getLHS());
+ AddValueSymbols(BE->getRHS());
+ break;
+ }
+
+ case MCExpr::SymbolRef:
+ Assembler.getOrCreateSymbolData(
+ cast<MCSymbolRefExpr>(Value)->getSymbol());
+ break;
+
+ case MCExpr::Unary:
+ AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
+ break;
+ }
+
return Value;
}
/// @{
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 EmitAssemblerFlag(MCAssemblerFlag Flag);
+ virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
+ virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr 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);
-
+ virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment);
+ virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
+ assert(0 && "macho doesn't support this directive");
+ }
+ virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
+ assert(0 && "macho doesn't support this directive");
+ }
virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
- unsigned Size = 0, unsigned Pow2Alignment = 0);
-
- virtual void EmitBytes(const StringRef &Data);
-
- virtual void EmitValue(const MCValue &Value, unsigned Size);
-
+ unsigned Size = 0, unsigned ByteAlignment = 0);
+ virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
+ virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
+ virtual void EmitGPRel32Value(const MCExpr *Value) {
+ assert(0 && "macho doesn't support this directive");
+ }
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
unsigned ValueSize = 1,
unsigned MaxBytesToEmit = 0);
-
- virtual void EmitValueToOffset(const MCValue &Offset,
+ virtual void EmitCodeAlignment(unsigned ByteAlignment,
+ unsigned MaxBytesToEmit = 0);
+ virtual void EmitValueToOffset(const MCExpr *Offset,
unsigned char Value = 0);
-
+
+ virtual void EmitFileDirective(StringRef Filename) {
+ errs() << "FIXME: MCMachoStreamer:EmitFileDirective not implemented\n";
+ }
+ virtual void EmitDwarfFileDirective(unsigned FileNo, StringRef Filename) {
+ errs() << "FIXME: MCMachoStreamer:EmitDwarfFileDirective not implemented\n";
+ }
+
virtual void EmitInstruction(const MCInst &Inst);
-
virtual void Finish();
/// @}
if (Section == CurSection) return;
CurSection = Section;
- CurSectionData = &getSectionData(*Section);
+ CurSectionData = &Assembler.getOrCreateSectionData(*Section);
}
void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
if (!F)
F = new MCDataFragment(CurSectionData);
- MCSymbolData &SD = getSymbolData(*Symbol);
+ MCSymbolData &SD = Assembler.getOrCreateSymbolData(*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) {
+void MCMachOStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
switch (Flag) {
- default:
- llvm_unreachable("FIXME: Not yet implemented!");
-
- case SubsectionsViaSymbols:
+ case MCAF_SubsectionsViaSymbols:
Assembler.setSubsectionsViaSymbols(true);
- break;
+ return;
}
+
+ assert(0 && "invalid assembler flag!");
}
-void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol,
- const MCValue &Value,
- bool MakeAbsolute) {
+void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
// Only absolute symbols can be redefined.
assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
"Cannot define a symbol twice!");
- llvm_unreachable("FIXME: Not yet implemented!");
+ // FIXME: Lift context changes into super class.
+ // FIXME: Set associated section.
+ Symbol->setValue(Value);
}
void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
- SymbolAttr Attribute) {
+ MCSymbolAttr Attribute) {
// Indirect symbols are handled differently, to match how 'as' handles
// them. This makes writing matching .o files easier.
- if (Attribute == MCStreamer::IndirectSymbol) {
+ if (Attribute == MCSA_IndirectSymbol) {
// Note that we intentionally cannot use the symbol data here; this is
// important for matching the string table that 'as' generates.
IndirectSymbolData ISD;
}
// Adding a symbol attribute always introduces the symbol, note that an
- // important side effect of calling getSymbolData here is to register the
- // symbol with the assembler.
- MCSymbolData &SD = getSymbolData(*Symbol);
+ // important side effect of calling getOrCreateSymbolData here is to register
+ // the symbol with the assembler.
+ MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
// The implementation of symbol attributes is designed to match 'as', but it
// leaves much to desired. It doesn't really make sense to arbitrarily add and
// In the future it might be worth trying to make these operations more well
// defined.
switch (Attribute) {
- case MCStreamer::IndirectSymbol:
- case MCStreamer::Hidden:
- case MCStreamer::Internal:
- case MCStreamer::Protected:
- case MCStreamer::Weak:
+ case MCSA_Invalid:
+ case MCSA_ELF_TypeFunction:
+ case MCSA_ELF_TypeIndFunction:
+ case MCSA_ELF_TypeObject:
+ case MCSA_ELF_TypeTLS:
+ case MCSA_ELF_TypeCommon:
+ case MCSA_ELF_TypeNoType:
+ case MCSA_IndirectSymbol:
+ case MCSA_Hidden:
+ case MCSA_Internal:
+ case MCSA_Protected:
+ case MCSA_Weak:
+ case MCSA_Local:
assert(0 && "Invalid symbol attribute for Mach-O!");
break;
- case MCStreamer::Global:
- getSymbolData(*Symbol).setExternal(true);
+ case MCSA_Global:
+ SD.setExternal(true);
break;
- case MCStreamer::LazyReference:
+ case MCSA_LazyReference:
// FIXME: This requires -dynamic.
SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
if (Symbol->isUndefined())
// Since .reference sets the no dead strip bit, it is equivalent to
// .no_dead_strip in practice.
- case MCStreamer::Reference:
- case MCStreamer::NoDeadStrip:
+ case MCSA_Reference:
+ case MCSA_NoDeadStrip:
SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
break;
- case MCStreamer::PrivateExtern:
+ case MCSA_PrivateExtern:
SD.setExternal(true);
SD.setPrivateExtern(true);
break;
- case MCStreamer::WeakReference:
+ case MCSA_WeakReference:
// FIXME: This requires -dynamic.
if (Symbol->isUndefined())
SD.setFlags(SD.getFlags() | SF_WeakReference);
break;
- case MCStreamer::WeakDefinition:
+ case MCSA_WeakDefinition:
// FIXME: 'as' enforces that this is defined and global. The manual claims
// it has to be in a coalesced section, but this isn't enforced.
SD.setFlags(SD.getFlags() | SF_WeakDefinition);
// Encode the 'desc' value into the lowest implementation defined bits.
assert(DescValue == (DescValue & SF_DescFlagsMask) &&
"Invalid .desc value!");
- getSymbolData(*Symbol).setFlags(DescValue & SF_DescFlagsMask);
+ Assembler.getOrCreateSymbolData(*Symbol).setFlags(DescValue&SF_DescFlagsMask);
}
-void MCMachOStreamer::EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value) {
- llvm_unreachable("FIXME: Not yet implemented!");
-}
+void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ // FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
-void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
- unsigned Pow2Alignment) {
- llvm_unreachable("FIXME: Not yet implemented!");
+ MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
+ SD.setExternal(true);
+ SD.setCommon(Size, ByteAlignment);
}
void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
- unsigned Size, unsigned Pow2Alignment) {
- unsigned ByteAlignment = 1 << Pow2Alignment;
- MCSectionData &SectData = getSectionData(*Section);
+ unsigned Size, unsigned ByteAlignment) {
+ MCSectionData &SectData = Assembler.getOrCreateSectionData(*Section);
// The symbol may not be present, which only creates the section.
if (!Symbol)
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- MCSymbolData &SD = getSymbolData(*Symbol);
+ MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
- MCFragment *F = new MCZeroFillFragment(Size, 1 << Pow2Alignment, &SectData);
+ MCFragment *F = new MCZeroFillFragment(Size, ByteAlignment, &SectData);
SD.setFragment(F);
Symbol->setSection(*Section);
SectData.setAlignment(ByteAlignment);
}
-void MCMachOStreamer::EmitBytes(const StringRef &Data) {
+void MCMachOStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
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(AddValueSymbols(Value), Size, 1, CurSectionData);
+void MCMachOStreamer::EmitValue(const MCExpr *Value, unsigned Size,
+ unsigned AddrSpace) {
+ MCDataFragment *DF = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
+ if (!DF)
+ DF = new MCDataFragment(CurSectionData);
+
+ // Avoid fixups when possible.
+ int64_t AbsValue;
+ if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue)) {
+ // FIXME: Endianness assumption.
+ for (unsigned i = 0; i != Size; ++i)
+ DF->getContents().push_back(uint8_t(AbsValue >> (i * 8)));
+ } else {
+ DF->getFixups().push_back(MCAsmFixup(DF->getContents().size(),
+ *AddValueSymbols(Value),
+ MCFixup::getKindForSize(Size)));
+ DF->getContents().resize(DF->getContents().size() + Size, 0);
+ }
}
void MCMachOStreamer::EmitValueToAlignment(unsigned ByteAlignment,
if (MaxBytesToEmit == 0)
MaxBytesToEmit = ByteAlignment;
new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
- CurSectionData);
+ false /* EmitNops */, CurSectionData);
// Update the maximum alignment on the current section if necessary.
if (ByteAlignment > CurSectionData->getAlignment())
CurSectionData->setAlignment(ByteAlignment);
}
-void MCMachOStreamer::EmitValueToOffset(const MCValue &Offset,
+void MCMachOStreamer::EmitCodeAlignment(unsigned ByteAlignment,
+ unsigned MaxBytesToEmit) {
+ if (MaxBytesToEmit == 0)
+ MaxBytesToEmit = ByteAlignment;
+ // FIXME the 0x90 is the default x86 1 byte nop opcode.
+ new MCAlignFragment(ByteAlignment, 0x90, 1, MaxBytesToEmit,
+ true /* EmitNops */, CurSectionData);
+
+ // Update the maximum alignment on the current section if necessary.
+ if (ByteAlignment > CurSectionData->getAlignment())
+ CurSectionData->setAlignment(ByteAlignment);
+}
+
+void MCMachOStreamer::EmitValueToOffset(const MCExpr *Offset,
unsigned char Value) {
- new MCOrgFragment(AddValueSymbols(Offset), Value, CurSectionData);
+ new MCOrgFragment(*Offset, Value, CurSectionData);
}
void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
// Scan for values.
for (unsigned i = 0; i != Inst.getNumOperands(); ++i)
- if (Inst.getOperand(i).isMCValue())
- AddValueSymbols(Inst.getOperand(i).getMCValue());
+ if (Inst.getOperand(i).isExpr())
+ AddValueSymbols(Inst.getOperand(i).getExpr());
if (!Emitter)
llvm_unreachable("no code emitter available!");
- // FIXME: Relocations!
+ CurSectionData->setHasInstructions(true);
+
+ SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
- Emitter->EncodeInstruction(Inst, VecOS);
- EmitBytes(VecOS.str());
+ Emitter->EncodeInstruction(Inst, VecOS, Fixups);
+ VecOS.flush();
+
+ // Add the fixups and data.
+ MCDataFragment *DF = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
+ if (!DF)
+ DF = new MCDataFragment(CurSectionData);
+ for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
+ MCFixup &F = Fixups[i];
+ DF->getFixups().push_back(MCAsmFixup(DF->getContents().size()+F.getOffset(),
+ *F.getValue(),
+ F.getKind()));
+ }
+ DF->getContents().append(Code.begin(), Code.end());
}
void MCMachOStreamer::Finish() {
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