#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCValue.h"
+#include "llvm/MC/MCMachOSymbolFlags.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetAsmBackend.h"
+
using namespace llvm;
namespace {
class MCMachOStreamer : public MCStreamer {
- /// SymbolFlags - We store the value for the 'desc' symbol field in the lowest
- /// 16 bits of the implementation defined flags.
- enum SymbolFlags { // See <mach-o/nlist.h>.
- SF_DescFlagsMask = 0xFFFF,
-
- // Reference type flags.
- SF_ReferenceTypeMask = 0x0007,
- SF_ReferenceTypeUndefinedNonLazy = 0x0000,
- SF_ReferenceTypeUndefinedLazy = 0x0001,
- SF_ReferenceTypeDefined = 0x0002,
- SF_ReferenceTypePrivateDefined = 0x0003,
- SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004,
- SF_ReferenceTypePrivateUndefinedLazy = 0x0005,
-
- // Other 'desc' flags.
- SF_NoDeadStrip = 0x0020,
- SF_WeakReference = 0x0040,
- SF_WeakDefinition = 0x0080
- };
private:
MCAssembler Assembler;
-
- MCCodeEmitter *Emitter;
-
MCSectionData *CurSectionData;
- DenseMap<const MCSection*, MCSectionData*> SectionMap;
-
- DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap;
+ /// Track the current atom for each section.
+ DenseMap<const MCSectionData*, MCSymbolData*> CurrentAtomMap;
private:
MCFragment *getCurrentFragment() const {
return 0;
}
- MCSectionData &getSectionData(const MCSection &Section) {
- MCSectionData *&Entry = SectionMap[&Section];
-
- if (!Entry)
- Entry = new MCSectionData(Section, &Assembler);
-
- return *Entry;
+ /// Get a data fragment to write into, creating a new one if the current
+ /// fragment is not a data fragment.
+ MCDataFragment *getOrCreateDataFragment() const {
+ MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
+ if (!F)
+ F = createDataFragment();
+ return F;
}
- MCSymbolData &getSymbolData(const MCSymbol &Symbol) {
- MCSymbolData *&Entry = SymbolMap[&Symbol];
-
- if (!Entry)
- Entry = new MCSymbolData(Symbol, 0, 0, &Assembler);
-
- return *Entry;
+ /// Create a new data fragment in the current section.
+ MCDataFragment *createDataFragment() const {
+ MCDataFragment *DF = new MCDataFragment(CurSectionData);
+ DF->setAtom(CurrentAtomMap.lookup(CurSectionData));
+ return DF;
}
+ void EmitInstToFragment(const MCInst &Inst);
+ void EmitInstToData(const MCInst &Inst);
+
public:
- MCMachOStreamer(MCContext &Context, raw_ostream &_OS, MCCodeEmitter *_Emitter)
- : MCStreamer(Context), Assembler(Context, _OS), Emitter(_Emitter),
+ MCMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
+ raw_ostream &_OS, MCCodeEmitter *_Emitter)
+ : MCStreamer(Context), Assembler(Context, TAB, *_Emitter, _OS),
CurSectionData(0) {}
~MCMachOStreamer() {}
+ MCAssembler &getAssembler() { return Assembler; }
+
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::SymbolRef:
- getSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
+ Assembler.getOrCreateSymbolData(
+ cast<MCSymbolRefExpr>(Value)->getSymbol());
break;
case MCExpr::Unary:
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
- virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
+ virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment);
+ virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {
+ assert(0 && "macho doesn't support this directive");
+ }
+ virtual void EmitCOFFSymbolStorageClass(int StorageClass) {
+ assert(0 && "macho doesn't support this directive");
+ }
+ virtual void EmitCOFFSymbolType(int Type) {
+ assert(0 && "macho doesn't support this directive");
+ }
+ virtual void EndCOFFSymbolDef() {
+ assert(0 && "macho doesn't support this directive");
+ }
+ 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 ByteAlignment = 0);
+ virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, 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 EmitCodeAlignment(unsigned ByteAlignment,
+ unsigned MaxBytesToEmit = 0);
virtual void EmitValueToOffset(const MCExpr *Offset,
unsigned char Value = 0);
+
+ virtual void EmitFileDirective(StringRef Filename) {
+ report_fatal_error("unsupported directive: '.file'");
+ }
+ virtual void EmitDwarfFileDirective(unsigned FileNo, StringRef Filename) {
+ report_fatal_error("unsupported directive: '.file'");
+ }
+
virtual void EmitInstruction(const MCInst &Inst);
virtual void Finish();
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;
- CurSectionData = &getSectionData(*Section);
+ CurSectionData = &Assembler.getOrCreateSectionData(*Section);
}
void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+ assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
+ assert(CurSection && "Cannot emit before setting section!");
+
+ MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
- // FIXME: We should also use offsets into Fill fragments.
- MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
- if (!F)
- F = new MCDataFragment(CurSectionData);
+ // Update the current atom map, if necessary.
+ bool MustCreateFragment = false;
+ if (Assembler.isSymbolLinkerVisible(&SD)) {
+ CurrentAtomMap[CurSectionData] = &SD;
+
+ // We have to create a new fragment, fragments cannot span atoms.
+ MustCreateFragment = true;
+ }
- MCSymbolData &SD = getSymbolData(*Symbol);
+ // FIXME: This is wasteful, we don't necessarily need to create a data
+ // fragment. Instead, we should mark the symbol as pointing into the data
+ // fragment if it exists, otherwise we should just queue the label and set its
+ // fragment pointer when we emit the next fragment.
+ MCDataFragment *F =
+ MustCreateFragment ? createDataFragment() : getOrCreateDataFragment();
assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
SD.setFragment(F);
SD.setOffset(F->getContents().size());
- // This causes the reference type and weak reference flags to be cleared.
- SD.setFlags(SD.getFlags() & ~(SF_WeakReference | SF_ReferenceTypeMask));
-
+ // This causes the reference type flag to be cleared. Darwin 'as' was "trying"
+ // to clear the weak reference and weak definition bits too, but the
+ // implementation was buggy. For now we just try to match 'as', for
+ // diffability.
+ //
+ // FIXME: Cleanup this code, these bits should be emitted based on semantic
+ // properties, not on the order of definition, etc.
+ SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeMask);
+
Symbol->setSection(*CurSection);
}
}
void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
- // Only absolute symbols can be redefined.
- assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
- "Cannot define a symbol twice!");
-
// FIXME: Lift context changes into super class.
- // FIXME: Set associated section.
- Symbol->setValue(Value);
+ Assembler.getOrCreateSymbolData(*Symbol);
+ Symbol->setVariableValue(AddValueSymbols(Value));
}
void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
}
// 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
// defined.
switch (Attribute) {
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_Global:
SD.setExternal(true);
+ // This effectively clears the undefined lazy bit, in Darwin 'as', although
+ // it isn't very consistent because it implements this as part of symbol
+ // lookup.
+ //
+ // FIXME: Cleanup this code, these bits should be emitted based on semantic
+ // properties, not on the order of definition, etc.
+ SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeUndefinedLazy);
break;
case MCSA_LazyReference:
void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
// Encode the 'desc' value into the lowest implementation defined bits.
- assert(DescValue == (DescValue & SF_DescFlagsMask) &&
+ assert(DescValue == (DescValue & SF_DescFlagsMask) &&
"Invalid .desc value!");
- getSymbolData(*Symbol).setFlags(DescValue & SF_DescFlagsMask);
+ Assembler.getOrCreateSymbolData(*Symbol).setFlags(DescValue&SF_DescFlagsMask);
}
-void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
+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!");
- MCSymbolData &SD = getSymbolData(*Symbol);
+ MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
SD.setExternal(true);
SD.setCommon(Size, ByteAlignment);
}
void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
unsigned Size, unsigned ByteAlignment) {
- MCSectionData &SectData = getSectionData(*Section);
+ 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);
+
+ // Emit an align fragment if necessary.
+ if (ByteAlignment != 1)
+ new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectData);
- MCFragment *F = new MCZeroFillFragment(Size, ByteAlignment, &SectData);
+ MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
SD.setFragment(F);
+ if (Assembler.isSymbolLinkerVisible(&SD))
+ F->setAtom(&SD);
Symbol->setSection(*Section);
SectData.setAlignment(ByteAlignment);
}
+// This should always be called with the thread local bss section. Like the
+// .zerofill directive this doesn't actually switch sections on us.
+void MCMachOStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment) {
+ EmitZerofill(Section, Symbol, Size, ByteAlignment);
+ return;
+}
+
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());
+ getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
}
void MCMachOStreamer::EmitValue(const MCExpr *Value, unsigned Size,
unsigned AddrSpace) {
- new MCFillFragment(*AddValueSymbols(Value), Size, 1, CurSectionData);
+ MCDataFragment *DF = getOrCreateDataFragment();
+
+ // 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->addFixup(MCFixup::Create(DF->getContents().size(),
+ AddValueSymbols(Value),
+ MCFixup::getKindForSize(Size)));
+ DF->getContents().resize(DF->getContents().size() + Size, 0);
+ }
}
void MCMachOStreamer::EmitValueToAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {
if (MaxBytesToEmit == 0)
MaxBytesToEmit = ByteAlignment;
- new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
- CurSectionData);
+ MCFragment *F = new MCAlignFragment(ByteAlignment, Value, ValueSize,
+ MaxBytesToEmit, CurSectionData);
+ F->setAtom(CurrentAtomMap.lookup(CurSectionData));
+
+ // Update the maximum alignment on the current section if necessary.
+ if (ByteAlignment > CurSectionData->getAlignment())
+ CurSectionData->setAlignment(ByteAlignment);
+}
+
+void MCMachOStreamer::EmitCodeAlignment(unsigned ByteAlignment,
+ unsigned MaxBytesToEmit) {
+ if (MaxBytesToEmit == 0)
+ MaxBytesToEmit = ByteAlignment;
+ MCAlignFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
+ CurSectionData);
+ F->setEmitNops(true);
+ F->setAtom(CurrentAtomMap.lookup(CurSectionData));
// Update the maximum alignment on the current section if necessary.
if (ByteAlignment > CurSectionData->getAlignment())
void MCMachOStreamer::EmitValueToOffset(const MCExpr *Offset,
unsigned char Value) {
- new MCOrgFragment(*Offset, Value, CurSectionData);
+ MCFragment *F = new MCOrgFragment(*Offset, Value, CurSectionData);
+ F->setAtom(CurrentAtomMap.lookup(CurSectionData));
+}
+
+void MCMachOStreamer::EmitInstToFragment(const MCInst &Inst) {
+ MCInstFragment *IF = new MCInstFragment(Inst, CurSectionData);
+ IF->setAtom(CurrentAtomMap.lookup(CurSectionData));
+
+ // Add the fixups and data.
+ //
+ // FIXME: Revisit this design decision when relaxation is done, we may be
+ // able to get away with not storing any extra data in the MCInst.
+ SmallVector<MCFixup, 4> Fixups;
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ VecOS.flush();
+
+ IF->getCode() = Code;
+ IF->getFixups() = Fixups;
+}
+
+void MCMachOStreamer::EmitInstToData(const MCInst &Inst) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+
+ SmallVector<MCFixup, 4> Fixups;
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ VecOS.flush();
+
+ // Add the fixups and data.
+ for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
+ Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
+ DF->addFixup(Fixups[i]);
+ }
+ DF->getContents().append(Code.begin(), Code.end());
}
void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
// Scan for values.
- for (unsigned i = 0; i != Inst.getNumOperands(); ++i)
+ for (unsigned i = Inst.getNumOperands(); i--; )
if (Inst.getOperand(i).isExpr())
AddValueSymbols(Inst.getOperand(i).getExpr());
- if (!Emitter)
- llvm_unreachable("no code emitter available!");
+ CurSectionData->setHasInstructions(true);
- // FIXME: Emitting an instruction should cause S_ATTR_SOME_INSTRUCTIONS to
- // be set for the current section.
- // FIXME: Relocations!
- SmallString<256> Code;
- raw_svector_ostream VecOS(Code);
- Emitter->EncodeInstruction(Inst, VecOS);
- EmitBytes(VecOS.str(), 0);
+ // If this instruction doesn't need relaxation, just emit it as data.
+ if (!Assembler.getBackend().MayNeedRelaxation(Inst)) {
+ EmitInstToData(Inst);
+ return;
+ }
+
+ // Otherwise, if we are relaxing everything, relax the instruction as much as
+ // possible and emit it as data.
+ if (Assembler.getRelaxAll()) {
+ MCInst Relaxed;
+ Assembler.getBackend().RelaxInstruction(Inst, Relaxed);
+ while (Assembler.getBackend().MayNeedRelaxation(Relaxed))
+ Assembler.getBackend().RelaxInstruction(Relaxed, Relaxed);
+ EmitInstToData(Relaxed);
+ return;
+ }
+
+ // Otherwise emit to a separate fragment.
+ EmitInstToFragment(Inst);
}
void MCMachOStreamer::Finish() {
Assembler.Finish();
}
-MCStreamer *llvm::createMachOStreamer(MCContext &Context, raw_ostream &OS,
- MCCodeEmitter *CE) {
- return new MCMachOStreamer(Context, OS, CE);
+MCStreamer *llvm::createMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
+ raw_ostream &OS, MCCodeEmitter *CE,
+ bool RelaxAll) {
+ MCMachOStreamer *S = new MCMachOStreamer(Context, TAB, OS, CE);
+ if (RelaxAll)
+ S->getAssembler().setRelaxAll(true);
+ return S;
}
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