#ifndef LLVM_MC_MCOBJECTSTREAMER_H
#define LLVM_MC_MCOBJECTSTREAMER_H
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
namespace llvm {
class MCAssembler;
class MCCodeEmitter;
-class MCSectionData;
+class MCSubtargetInfo;
class MCExpr;
class MCFragment;
class MCDataFragment;
-class TargetAsmBackend;
+class MCAsmBackend;
class raw_ostream;
+class raw_pwrite_stream;
/// \brief Streaming object file generation interface.
///
/// implementation.
class MCObjectStreamer : public MCStreamer {
MCAssembler *Assembler;
- MCSectionData *CurSectionData;
+ MCSection::iterator CurInsertionPoint;
+ bool EmitEHFrame;
+ bool EmitDebugFrame;
+ SmallVector<MCSymbol *, 2> PendingLabels;
- virtual void EmitInstToData(const MCInst &Inst) = 0;
+ virtual void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo&) = 0;
+ void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override;
+ void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override;
protected:
- MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
- raw_ostream &_OS, MCCodeEmitter *_Emitter,
- bool _PadSectionToAlignment);
- ~MCObjectStreamer();
+ MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB, raw_pwrite_stream &OS,
+ MCCodeEmitter *Emitter);
+ ~MCObjectStreamer() override;
- MCSectionData *getCurrentSectionData() const {
- return CurSectionData;
- }
+public:
+ /// state management
+ void reset() override;
+
+ /// Object streamers require the integrated assembler.
+ bool isIntegratedAssemblerRequired() const override { return true; }
+ void EmitFrames(MCAsmBackend *MAB);
+ void EmitCFISections(bool EH, bool Debug) override;
+
+protected:
MCFragment *getCurrentFragment() const;
+ void insert(MCFragment *F) {
+ flushPendingLabels(F);
+ MCSection *CurSection = getCurrentSectionOnly();
+ CurSection->getFragmentList().insert(CurInsertionPoint, F);
+ F->setParent(CurSection);
+ }
+
/// Get a data fragment to write into, creating a new one if the current
/// fragment is not a data fragment.
- MCDataFragment *getOrCreateDataFragment() const;
+ MCDataFragment *getOrCreateDataFragment();
- const MCExpr *AddValueSymbols(const MCExpr *Value);
+ bool changeSectionImpl(MCSection *Section, const MCExpr *Subsection);
+
+ /// If any labels have been emitted but not assigned fragments, ensure that
+ /// they get assigned, either to F if possible or to a new data fragment.
+ /// Optionally, it is also possible to provide an offset \p FOffset, which
+ /// will be used as a symbol offset within the fragment.
+ void flushPendingLabels(MCFragment *F, uint64_t FOffset = 0);
public:
+ void visitUsedSymbol(const MCSymbol &Sym) override;
+
MCAssembler &getAssembler() { return *Assembler; }
- /// @name MCStreamer Interface
+ /// \name MCStreamer Interface
/// @{
- virtual void EmitLabel(MCSymbol *Symbol);
- virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
- virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
- virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
- virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
- virtual void SwitchSection(const MCSection *Section);
- virtual void EmitInstruction(const MCInst &Inst);
- virtual void EmitInstToFragment(const MCInst &Inst);
- virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
- virtual void Finish();
-
- /// @}
+ void EmitLabel(MCSymbol *Symbol) override;
+ void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
+ void EmitValueImpl(const MCExpr *Value, unsigned Size,
+ SMLoc Loc = SMLoc()) override;
+ void EmitULEB128Value(const MCExpr *Value) override;
+ void EmitSLEB128Value(const MCExpr *Value) override;
+ void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
+ void ChangeSection(MCSection *Section, const MCExpr *Subsection) override;
+ void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo& STI) override;
+
+ /// \brief Emit an instruction to a special fragment, because this instruction
+ /// can change its size during relaxation.
+ virtual void EmitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &);
+
+ void EmitBundleAlignMode(unsigned AlignPow2) override;
+ void EmitBundleLock(bool AlignToEnd) override;
+ void EmitBundleUnlock() override;
+ void EmitBytes(StringRef Data) override;
+ void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
+ unsigned ValueSize = 1,
+ unsigned MaxBytesToEmit = 0) override;
+ void EmitCodeAlignment(unsigned ByteAlignment,
+ unsigned MaxBytesToEmit = 0) override;
+ void emitValueToOffset(const MCExpr *Offset, unsigned char Value) override;
+ void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
+ unsigned Column, unsigned Flags,
+ unsigned Isa, unsigned Discriminator,
+ StringRef FileName) override;
+ void EmitDwarfAdvanceLineAddr(int64_t LineDelta, const MCSymbol *LastLabel,
+ const MCSymbol *Label,
+ unsigned PointerSize);
+ void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
+ const MCSymbol *Label);
+ void EmitGPRel32Value(const MCExpr *Value) override;
+ void EmitGPRel64Value(const MCExpr *Value) override;
+ bool EmitRelocDirective(const MCExpr &Offset, StringRef Name,
+ const MCExpr *Expr, SMLoc Loc) override;
+ void EmitFill(uint64_t NumBytes, uint8_t FillValue) override;
+ void FinishImpl() override;
+
+ /// Emit the absolute difference between two symbols if possible.
+ ///
+ /// Emit the absolute difference between \c Hi and \c Lo, as long as we can
+ /// compute it. Currently, that requires that both symbols are in the same
+ /// data fragment. Otherwise, do nothing and return \c false.
+ ///
+ /// \pre Offset of \c Hi is greater than the offset \c Lo.
+ void emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
+ unsigned Size) override;
+
+ bool mayHaveInstructions(MCSection &Sec) const override;
};
} // end namespace llvm
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