//
//===----------------------------------------------------------------------===//
//
-// This file contains an implementation of a Win32 COFF object file streamer.
+// This file contains an implementation of a Windows COFF object file streamer.
//
//===----------------------------------------------------------------------===//
+#include "llvm/ADT/StringExtras.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
-#include "llvm/MC/MCWin64EH.h"
+#include "llvm/MC/MCWinCOFFStreamer.h"
#include "llvm/Support/COFF.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MathExtras.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#define DEBUG_TYPE "WinCOFFStreamer"
-namespace {
-class WinCOFFStreamer : public MCObjectStreamer {
-public:
- MCSymbol const *CurSymbol;
-
- WinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB, MCCodeEmitter &CE,
- raw_ostream &OS);
-
- // MCStreamer interface
-
- void InitSections() override;
- void EmitLabel(MCSymbol *Symbol) override;
- void EmitDebugLabel(MCSymbol *Symbol) override;
- void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
- void EmitThumbFunc(MCSymbol *Func) override;
- bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
- void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
- void BeginCOFFSymbolDef(MCSymbol const *Symbol) override;
- void EmitCOFFSymbolStorageClass(int StorageClass) override;
- void EmitCOFFSymbolType(int Type) override;
- void EndCOFFSymbolDef() override;
- void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
- void EmitCOFFSecRel32(MCSymbol const *Symbol) override;
- void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
- void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment) override;
- void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment) override;
- void EmitZerofill(const MCSection *Section, MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment) override;
- void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment) override;
- void EmitFileDirective(StringRef Filename) override;
- void EmitIdent(StringRef IdentString) override;
- void EmitWin64EHHandlerData() override;
- void FinishImpl() override;
-
-private:
- void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &STI) override {
- 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]);
- }
- DF->getContents().append(Code.begin(), Code.end());
- }
-};
-} // end anonymous namespace.
-
-WinCOFFStreamer::WinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB,
- 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) {}
-// MCStreamer interface
+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]);
+ }
-void WinCOFFStreamer::InitSections() {
+ DF->getContents().append(Code.begin(), Code.end());
+}
+
+void MCWinCOFFStreamer::InitSections(bool NoExecStack) {
// 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());
}
-void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
+void MCWinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
MCObjectStreamer::EmitLabel(Symbol);
}
-void WinCOFFStreamer::EmitDebugLabel(MCSymbol *Symbol) {
- EmitLabel(Symbol);
-}
-
-void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
+void MCWinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) {
+void MCWinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) {
llvm_unreachable("not implemented");
}
-bool WinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
- MCSymbolAttr Attribute) {
+bool MCWinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+ MCSymbolAttr Attribute) {
assert(Symbol && "Symbol must be non-null!");
assert((!Symbol->isInSection() ||
Symbol->getSection().getVariant() == MCSection::SV_COFF) &&
return true;
}
-void WinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
+void MCWinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) {
+void MCWinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) {
assert((!Symbol->isInSection() ||
Symbol->getSection().getVariant() == MCSection::SV_COFF) &&
"Got non-COFF section in the COFF backend!");
- assert(!CurSymbol && "starting new symbol definition in a symbol definition");
+
+ if (CurSymbol)
+ FatalError("starting a new symbol definition without completing the "
+ "previous one");
CurSymbol = Symbol;
}
-void WinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
- assert(CurSymbol && "StorageClass specified outside of symbol definition");
- assert((StorageClass & ~0xFF) == 0 &&
- "StorageClass must only have data in the first byte!");
+void MCWinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
+ if (!CurSymbol)
+ FatalError("storage class specified outside of symbol definition");
+
+ if (StorageClass & ~COFF::SSC_Invalid)
+ 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::EmitCOFFSymbolType(int Type) {
- assert(CurSymbol && "SymbolType specified outside of a symbol definition");
- assert((Type & ~0xFFFF) == 0 &&
- "Type must only have data in the first 2 bytes");
+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");
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*CurSymbol);
SD.modifyFlags(Type << COFF::SF_TypeShift, COFF::SF_TypeMask);
}
-void WinCOFFStreamer::EndCOFFSymbolDef() {
- assert(CurSymbol && "ending symbol definition without beginning one");
+void MCWinCOFFStreamer::EndCOFFSymbolDef() {
+ if (!CurSymbol)
+ FatalError("ending symbol definition without starting one");
CurSymbol = nullptr;
}
-void WinCOFFStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
+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);
+ DF->getContents().resize(DF->getContents().size() + 2, 0);
}
-void WinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
+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->getContents().resize(DF->getContents().size() + 4, 0);
}
-void WinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
+void MCWinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
llvm_unreachable("not supported");
}
-void WinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment) {
+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");
+ const Triple &T = getContext().getObjectFileInfo()->getTargetTriple();
+ if (T.isKnownWindowsMSVCEnvironment()) {
+ if (ByteAlignment > 32)
+ report_fatal_error("alignment is limited to 32-bytes");
+
+ // Round size up to alignment so that we will honor the alignment request.
+ Size = std::max(Size, static_cast<uint64_t>(ByteAlignment));
+ }
AssignSection(Symbol, nullptr);
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
SD.setExternal(true);
SD.setCommon(Size, ByteAlignment);
+
+ if (!T.isKnownWindowsMSVCEnvironment() && ByteAlignment > 1) {
+ SmallString<128> Directive;
+ raw_svector_ostream OS(Directive);
+ const MCObjectFileInfo *MFI = getContext().getObjectFileInfo();
+
+ OS << " -aligncomm:\"" << Symbol->getName() << "\","
+ << Log2_32_Ceil(ByteAlignment);
+ OS.flush();
+
+ PushSection();
+ SwitchSection(MFI->getDrectveSection());
+ EmitBytes(Directive);
+ PopSection();
+ }
}
-void WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment) {
+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();
SD.setFragment(Fragment);
}
-void WinCOFFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
- uint64_t Size, unsigned ByteAlignment) {
+void MCWinCOFFStreamer::EmitZerofill(const MCSection *Section,
+ MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
- uint64_t Size, unsigned ByteAlignment) {
+void MCWinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section,
+ MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitFileDirective(StringRef Filename) {
+void MCWinCOFFStreamer::EmitFileDirective(StringRef Filename) {
getAssembler().addFileName(Filename);
}
// TODO: Implement this if you want to emit .comment section in COFF obj files.
-void WinCOFFStreamer::EmitIdent(StringRef IdentString) {
+void MCWinCOFFStreamer::EmitIdent(StringRef IdentString) {
llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::EmitWin64EHHandlerData() {
- MCStreamer::EmitWin64EHHandlerData();
-
- // We have to emit the unwind info now, because this directive
- // actually switches to the .xdata section!
- MCWin64EHUnwindEmitter::EmitUnwindInfo(*this, getCurrentW64UnwindInfo());
+void MCWinCOFFStreamer::EmitWinEHHandlerData() {
+ llvm_unreachable("not implemented");
}
-void WinCOFFStreamer::FinishImpl() {
- EmitFrames(nullptr, true);
- EmitW64Tables();
+void MCWinCOFFStreamer::FinishImpl() {
MCObjectStreamer::FinishImpl();
}
-namespace llvm {
-MCStreamer *createWinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB,
- MCCodeEmitter &CE, raw_ostream &OS,
- bool RelaxAll) {
- WinCOFFStreamer *S = new WinCOFFStreamer(Context, MAB, CE, OS);
- S->getAssembler().setRelaxAll(RelaxAll);
- return S;
+LLVM_ATTRIBUTE_NORETURN
+void MCWinCOFFStreamer::FatalError(const Twine &Msg) const {
+ getContext().FatalError(SMLoc(), Msg);
}
}
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