//
//===----------------------------------------------------------------------===//
//
-// This file contains an implementation of a Win32 COFF object file streamer.
+// This file contains an implementation of a Windows COFF object file streamer.
//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "WinCOFFStreamer"
-
-#include "llvm/MC/MCObjectStreamer.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCObjectStreamer.h"
+#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionCOFF.h"
-#include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/MC/MCWinCOFFStreamer.h"
#include "llvm/Support/COFF.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
+
using namespace llvm;
-#define dbg_notimpl(x) \
- do { dbgs() << "not implemented, " << __FUNCTION__ << " (" << x << ")"; \
- abort(); } while (false);
+#define DEBUG_TYPE "WinCOFFStreamer"
-namespace {
-class WinCOFFStreamer : public MCObjectStreamer {
-public:
- WinCOFFStreamer(MCContext &Context,
- TargetAsmBackend &TAB,
- MCCodeEmitter &CE,
- raw_ostream &OS);
+namespace llvm {
+MCWinCOFFStreamer::MCWinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB,
+ MCCodeEmitter &CE, raw_ostream &OS)
+ : MCObjectStreamer(Context, MAB, OS, &CE), CurSymbol(nullptr) {}
+
+void MCWinCOFFStreamer::EmitInstToData(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+
+ SmallVector<MCFixup, 4> Fixups;
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
+ 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->getFixups().push_back(Fixups[i]);
+ }
- // MCStreamer interface
+ DF->getContents().append(Code.begin(), Code.end());
+}
- virtual void EmitLabel(MCSymbol *Symbol);
- 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 BeginCOFFSymbolDef(MCSymbol const *Symbol);
- virtual void EmitCOFFSymbolStorageClass(int StorageClass);
- virtual void EmitCOFFSymbolType(int Type);
- virtual void EndCOFFSymbolDef();
- virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
- virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment);
- virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
- virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
- unsigned Size,unsigned ByteAlignment);
- virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
- uint64_t Size, unsigned ByteAlignment);
- virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
- virtual void EmitValue(const MCExpr *Value, unsigned Size,
- unsigned AddrSpace);
- virtual void EmitGPRel32Value(const MCExpr *Value);
- virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
- unsigned ValueSize, unsigned MaxBytesToEmit);
- virtual void EmitCodeAlignment(unsigned ByteAlignment,
- unsigned MaxBytesToEmit);
- virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
- virtual void EmitFileDirective(StringRef Filename);
- virtual void EmitDwarfFileDirective(unsigned FileNo,StringRef Filename);
- virtual void EmitInstruction(const MCInst &Instruction);
- virtual void Finish();
-};
-} // end anonymous namespace.
+void MCWinCOFFStreamer::InitSections() {
+ // FIXME: this is identical to the ELF one.
+ // This emulates the same behavior of GNU as. This makes it easier
+ // to compare the output as the major sections are in the same order.
+ SwitchSection(getContext().getObjectFileInfo()->getTextSection());
+ EmitCodeAlignment(4);
-WinCOFFStreamer::WinCOFFStreamer(MCContext &Context,
- TargetAsmBackend &TAB,
- MCCodeEmitter &CE,
- raw_ostream &OS)
- : MCObjectStreamer(Context, TAB, OS, &CE) {
-}
+ SwitchSection(getContext().getObjectFileInfo()->getDataSection());
+ EmitCodeAlignment(4);
-// MCStreamer interface
+ SwitchSection(getContext().getObjectFileInfo()->getBSSSection());
+ EmitCodeAlignment(4);
-void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
+ SwitchSection(getContext().getObjectFileInfo()->getTextSection());
}
-void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
- dbg_notimpl("Flag = " << Flag);
+void MCWinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+ MCObjectStreamer::EmitLabel(Symbol);
}
-void WinCOFFStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+void MCWinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
+ llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
- MCSymbolAttr Attribute) {
+void MCWinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) {
+ llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
- dbg_notimpl("Symbol = " << Symbol->getName() << ", DescValue = "<< DescValue);
-}
+bool MCWinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+ MCSymbolAttr Attribute) {
+ assert(Symbol && "Symbol must be non-null!");
+ assert((!Symbol->isInSection() ||
+ Symbol->getSection().getVariant() == MCSection::SV_COFF) &&
+ "Got non-COFF section in the COFF backend!");
-void WinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) {
-}
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
-void WinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
-}
+ switch (Attribute) {
+ default: return false;
+ case MCSA_WeakReference:
+ case MCSA_Weak:
+ SD.modifyFlags(COFF::SF_WeakExternal, COFF::SF_WeakExternal);
+ SD.setExternal(true);
+ break;
+ case MCSA_Global:
+ SD.setExternal(true);
+ break;
+ }
-void WinCOFFStreamer::EmitCOFFSymbolType(int Type) {
+ return true;
}
-void WinCOFFStreamer::EndCOFFSymbolDef() {
+void MCWinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
+ llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
- dbg_notimpl("Symbol = " << Symbol->getName() << ", Value = " << *Value);
-}
+void MCWinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) {
+ assert((!Symbol->isInSection() ||
+ Symbol->getSection().getVariant() == MCSection::SV_COFF) &&
+ "Got non-COFF section in the COFF backend!");
-void WinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment) {
+ if (CurSymbol)
+ FatalError("starting a new symbol definition without completing the "
+ "previous one");
+ CurSymbol = Symbol;
}
-void WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
+void MCWinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
+ if (!CurSymbol)
+ FatalError("storage class specified outside of symbol definition");
+
+ if (StorageClass & ~0xff)
+ FatalError(Twine("storage class value '") + itostr(StorageClass) +
+ "' out of range");
+
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*CurSymbol);
+ SD.modifyFlags(StorageClass << COFF::SF_ClassShift, COFF::SF_ClassMask);
}
-void WinCOFFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
- unsigned Size,unsigned ByteAlignment) {
- MCSectionCOFF const *SectionCOFF =
- static_cast<MCSectionCOFF const *>(Section);
+void MCWinCOFFStreamer::EmitCOFFSymbolType(int Type) {
+ if (!CurSymbol)
+ FatalError("symbol type specified outside of a symbol definition");
+
+ if (Type & ~0xffff)
+ FatalError(Twine("type value '") + itostr(Type) + "' out of range");
- dbg_notimpl("Section = " << SectionCOFF->getSectionName() << ", Symbol = " <<
- Symbol->getName() << ", Size = " << Size << ", ByteAlignment = "
- << ByteAlignment);
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*CurSymbol);
+ SD.modifyFlags(Type << COFF::SF_TypeShift, COFF::SF_TypeMask);
}
-void WinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
- uint64_t Size, unsigned ByteAlignment) {
- MCSectionCOFF const *SectionCOFF =
- static_cast<MCSectionCOFF const *>(Section);
+void MCWinCOFFStreamer::EndCOFFSymbolDef() {
+ if (!CurSymbol)
+ FatalError("ending symbol definition without starting one");
+ CurSymbol = nullptr;
+}
- dbg_notimpl("Section = " << SectionCOFF->getSectionName() << ", Symbol = " <<
- Symbol->getName() << ", Size = " << Size << ", ByteAlignment = "
- << ByteAlignment);
+void MCWinCOFFStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+ const MCSymbolRefExpr *SRE = MCSymbolRefExpr::Create(Symbol, getContext());
+ MCFixup Fixup = MCFixup::Create(DF->getContents().size(), SRE, FK_SecRel_2);
+ DF->getFixups().push_back(Fixup);
+ DF->getContents().resize(DF->getContents().size() + 4, 0);
}
-void WinCOFFStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
+void MCWinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+ const MCSymbolRefExpr *SRE = MCSymbolRefExpr::Create(Symbol, getContext());
+ MCFixup Fixup = MCFixup::Create(DF->getContents().size(), SRE, FK_SecRel_4);
+ DF->getFixups().push_back(Fixup);
+ DF->getContents().resize(DF->getContents().size() + 4, 0);
}
-void WinCOFFStreamer::EmitValue(const MCExpr *Value, unsigned Size,
- unsigned AddrSpace) {
+void MCWinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
+ llvm_unreachable("not supported");
}
-void WinCOFFStreamer::EmitGPRel32Value(const MCExpr *Value) {
- dbg_notimpl("Value = '" << *Value);
+void MCWinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ assert((!Symbol->isInSection() ||
+ Symbol->getSection().getVariant() == MCSection::SV_COFF) &&
+ "Got non-COFF section in the COFF backend!");
+
+ if (ByteAlignment > 32)
+ report_fatal_error("alignment is limited to 32-bytes");
+
+ AssignSection(Symbol, nullptr);
+
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+ SD.setExternal(true);
+ SD.setCommon(Size, ByteAlignment);
}
-void WinCOFFStreamer::EmitValueToAlignment(unsigned ByteAlignment,
- int64_t Value,
- unsigned ValueSize,
- unsigned MaxBytesToEmit) {
+void MCWinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ assert(!Symbol->isInSection() && "Symbol must not already have a section!");
+
+ const MCSection *Section = getContext().getObjectFileInfo()->getBSSSection();
+ MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section);
+ if (SectionData.getAlignment() < ByteAlignment)
+ SectionData.setAlignment(ByteAlignment);
+
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+ SD.setExternal(false);
+
+ AssignSection(Symbol, Section);
+
+ if (ByteAlignment != 1)
+ new MCAlignFragment(ByteAlignment, /*_Value=*/0, /*_ValueSize=*/0,
+ ByteAlignment, &SectionData);
+
+ MCFillFragment *Fragment =
+ new MCFillFragment(/*_Value=*/0, /*_ValueSize=*/0, Size, &SectionData);
+ SD.setFragment(Fragment);
}
-void WinCOFFStreamer::EmitCodeAlignment(unsigned ByteAlignment,
- unsigned MaxBytesToEmit = 0) {
+void MCWinCOFFStreamer::EmitZerofill(const MCSection *Section,
+ MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitValueToOffset(const MCExpr *Offset,
- unsigned char Value = 0) {
- dbg_notimpl("Offset = '" << *Offset << "', Value = " << Value);
+void MCWinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section,
+ MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitFileDirective(StringRef Filename) {
- // Ignore for now, linkers don't care, and proper debug
- // info will be a much large effort.
+void MCWinCOFFStreamer::EmitFileDirective(StringRef Filename) {
+ getAssembler().addFileName(Filename);
}
-void WinCOFFStreamer::EmitDwarfFileDirective(unsigned FileNo,
- StringRef Filename) {
- dbg_notimpl("FileNo = " << FileNo << ", Filename = '" << Filename << "'");
+// TODO: Implement this if you want to emit .comment section in COFF obj files.
+void MCWinCOFFStreamer::EmitIdent(StringRef IdentString) {
+ llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitInstruction(const MCInst &Instruction) {
+void MCWinCOFFStreamer::EmitWinEHHandlerData() {
+ llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::Finish() {
- MCObjectStreamer::Finish();
+void MCWinCOFFStreamer::FinishImpl() {
+ MCObjectStreamer::FinishImpl();
}
-namespace llvm
-{
- MCStreamer *createWinCOFFStreamer(MCContext &Context,
- TargetAsmBackend &TAB,
- MCCodeEmitter &CE,
- raw_ostream &OS) {
- return new WinCOFFStreamer(Context, TAB, CE, OS);
- }
+LLVM_ATTRIBUTE_NORETURN
+void MCWinCOFFStreamer::FatalError(const Twine &Msg) const {
+ getContext().FatalError(SMLoc(), Msg);
}
+}
+
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