#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCMachOSymbolFlags.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetAsmBackend.h"
using namespace llvm;
class MCMachOStreamer : public MCObjectStreamer {
private:
- void EmitInstToFragment(const MCInst &Inst);
- void EmitInstToData(const MCInst &Inst);
+ virtual void EmitInstToData(const MCInst &Inst);
public:
- MCMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
+ MCMachOStreamer(MCContext &Context, MCAsmBackend &MAB,
raw_ostream &OS, MCCodeEmitter *Emitter)
- : MCObjectStreamer(Context, TAB, OS, Emitter) {}
+ : MCObjectStreamer(Context, MAB, OS, Emitter) {}
/// @name MCStreamer Interface
/// @{
+ virtual void InitSections();
virtual void EmitLabel(MCSymbol *Symbol);
+ virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
+ MCSymbol *EHSymbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
+ virtual void EmitThumbFunc(MCSymbol *Func);
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, uint64_t Size,
unsigned ByteAlignment);
virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {
- assert(0 && "macho doesn't support this directive");
+ llvm_unreachable("macho doesn't support this directive");
}
virtual void EmitCOFFSymbolStorageClass(int StorageClass) {
- assert(0 && "macho doesn't support this directive");
+ llvm_unreachable("macho doesn't support this directive");
}
virtual void EmitCOFFSymbolType(int Type) {
- assert(0 && "macho doesn't support this directive");
+ llvm_unreachable("macho doesn't support this directive");
}
virtual void EndCOFFSymbolDef() {
- assert(0 && "macho doesn't support this directive");
+ llvm_unreachable("macho doesn't support this directive");
}
virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
- assert(0 && "macho doesn't support this directive");
+ llvm_unreachable("macho doesn't support this directive");
}
- virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
- assert(0 && "macho doesn't support this directive");
+ virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ llvm_unreachable("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'");
- }
+ // FIXME: Just ignore the .file; it isn't important enough to fail the
+ // entire assembly.
- virtual void EmitInstruction(const MCInst &Inst);
+ //report_fatal_error("unsupported directive: '.file'");
+ }
- virtual void Finish();
+ virtual void FinishImpl();
/// @}
};
} // end anonymous namespace.
-void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
- // TODO: This is almost exactly the same as WinCOFFStreamer. Consider merging
- // into MCObjectStreamer.
- assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
- assert(CurSection && "Cannot emit before setting section!");
+void MCMachOStreamer::InitSections() {
+ SwitchSection(getContext().getMachOSection("__TEXT", "__text",
+ MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
+ 0, SectionKind::getText()));
- Symbol->setSection(*CurSection);
+}
- MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+void MCMachOStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
+ MCSymbol *EHSymbol) {
+ MCSymbolData &SD =
+ getAssembler().getOrCreateSymbolData(*Symbol);
+ if (SD.isExternal())
+ EmitSymbolAttribute(EHSymbol, MCSA_Global);
+ if (SD.getFlags() & SF_WeakDefinition)
+ EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
+ if (SD.isPrivateExtern())
+ EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
+}
+
+void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+ // isSymbolLinkerVisible uses the section.
+ Symbol->setSection(*getCurrentSection());
// We have to create a new fragment if this is an atom defining symbol,
// fragments cannot span atoms.
- if (getAssembler().isSymbolLinkerVisible(SD.getSymbol()))
+ if (getAssembler().isSymbolLinkerVisible(*Symbol))
new MCDataFragment(getCurrentSectionData());
- // 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 = getOrCreateDataFragment();
- assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
- SD.setFragment(F);
- SD.setOffset(F->getContents().size());
+ MCObjectStreamer::EmitLabel(Symbol);
+ MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
// 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
}
void MCMachOStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
+ // Let the target do whatever target specific stuff it needs to do.
+ getAssembler().getBackend().handleAssemblerFlag(Flag);
+ // Do any generic stuff we need to do.
switch (Flag) {
+ case MCAF_SyntaxUnified: return; // no-op here.
+ case MCAF_Code16: return; // Change parsing mode; no-op here.
+ case MCAF_Code32: return; // Change parsing mode; no-op here.
+ case MCAF_Code64: return; // Change parsing mode; no-op here.
case MCAF_SubsectionsViaSymbols:
getAssembler().setSubsectionsViaSymbols(true);
return;
}
+}
+
+void MCMachOStreamer::EmitThumbFunc(MCSymbol *Symbol) {
+ // Remember that the function is a thumb function. Fixup and relocation
+ // values will need adjusted.
+ getAssembler().setIsThumbFunc(Symbol);
- assert(0 && "invalid assembler flag!");
+ // Mark the thumb bit on the symbol.
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+ SD.setFlags(SD.getFlags() | SF_ThumbFunc);
}
void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
case MCSA_ELF_TypeTLS:
case MCSA_ELF_TypeCommon:
case MCSA_ELF_TypeNoType:
- case MCSA_IndirectSymbol:
+ case MCSA_ELF_TypeGnuUniqueObject:
case MCSA_Hidden:
+ case MCSA_IndirectSymbol:
case MCSA_Internal:
case MCSA_Protected:
case MCSA_Weak:
case MCSA_Local:
- assert(0 && "Invalid symbol attribute for Mach-O!");
- break;
+ llvm_unreachable("Invalid symbol attribute for Mach-O!");
case MCSA_Global:
SD.setExternal(true);
SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
break;
+ case MCSA_SymbolResolver:
+ SD.setFlags(SD.getFlags() | SF_SymbolResolver);
+ break;
+
case MCSA_PrivateExtern:
SD.setExternal(true);
SD.setPrivateExtern(true);
getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
}
-void MCMachOStreamer::EmitValue(const MCExpr *Value, unsigned Size,
- unsigned AddrSpace) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
- 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,
int64_t Value, unsigned ValueSize,
unsigned MaxBytesToEmit) {
getCurrentSectionData()->setAlignment(ByteAlignment);
}
-void MCMachOStreamer::EmitValueToOffset(const MCExpr *Offset,
- unsigned char Value) {
- new MCOrgFragment(*Offset, Value, getCurrentSectionData());
-}
-
-void MCMachOStreamer::EmitInstToFragment(const MCInst &Inst) {
- MCInstFragment *IF = new MCInstFragment(Inst, getCurrentSectionData());
-
- // 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);
- getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
- VecOS.flush();
-
- IF->getCode() = Code;
- IF->getFixups() = Fixups;
-}
-
void MCMachOStreamer::EmitInstToData(const MCInst &Inst) {
MCDataFragment *DF = getOrCreateDataFragment();
DF->getContents().append(Code.begin(), Code.end());
}
-void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
- // Scan for values.
- for (unsigned i = Inst.getNumOperands(); i--; )
- if (Inst.getOperand(i).isExpr())
- AddValueSymbols(Inst.getOperand(i).getExpr());
-
- getCurrentSectionData()->setHasInstructions(true);
-
- // If this instruction doesn't need relaxation, just emit it as data.
- if (!getAssembler().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 (getAssembler().getRelaxAll()) {
- MCInst Relaxed;
- getAssembler().getBackend().RelaxInstruction(Inst, Relaxed);
- while (getAssembler().getBackend().MayNeedRelaxation(Relaxed))
- getAssembler().getBackend().RelaxInstruction(Relaxed, Relaxed);
- EmitInstToData(Relaxed);
- return;
- }
-
- // Otherwise emit to a separate fragment.
- EmitInstToFragment(Inst);
-}
+void MCMachOStreamer::FinishImpl() {
+ EmitFrames(true);
-void MCMachOStreamer::Finish() {
// We have to set the fragment atom associations so we can relax properly for
// Mach-O.
}
}
- this->MCObjectStreamer::Finish();
+ this->MCObjectStreamer::FinishImpl();
}
-MCStreamer *llvm::createMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
+MCStreamer *llvm::createMachOStreamer(MCContext &Context, MCAsmBackend &MAB,
raw_ostream &OS, MCCodeEmitter *CE,
bool RelaxAll) {
- MCMachOStreamer *S = new MCMachOStreamer(Context, TAB, OS, CE);
+ MCMachOStreamer *S = new MCMachOStreamer(Context, MAB, OS, CE);
if (RelaxAll)
S->getAssembler().setRelaxAll(true);
return S;
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