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214 lines
9.0 KiB
C++
214 lines
9.0 KiB
C++
//===- MCObjectStreamer.h - MCStreamer Object File Interface ----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCOBJECTSTREAMER_H
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#define LLVM_MC_MCOBJECTSTREAMER_H
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCStreamer.h"
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namespace llvm {
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class MCAssembler;
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class MCCodeEmitter;
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class MCSubtargetInfo;
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class MCExpr;
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class MCFragment;
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class MCDataFragment;
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class MCAsmBackend;
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class raw_ostream;
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class raw_pwrite_stream;
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/// Streaming object file generation interface.
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///
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/// This class provides an implementation of the MCStreamer interface which is
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/// suitable for use with the assembler backend. Specific object file formats
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/// are expected to subclass this interface to implement directives specific
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/// to that file format or custom semantics expected by the object writer
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/// implementation.
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class MCObjectStreamer : public MCStreamer {
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std::unique_ptr<MCAssembler> Assembler;
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MCSection::iterator CurInsertionPoint;
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bool EmitEHFrame;
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bool EmitDebugFrame;
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SmallVector<MCSymbol *, 2> PendingLabels;
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SmallSetVector<MCSection *, 4> PendingLabelSections;
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unsigned CurSubsectionIdx;
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struct PendingMCFixup {
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const MCSymbol *Sym;
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MCFixup Fixup;
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MCDataFragment *DF;
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PendingMCFixup(const MCSymbol *McSym, MCDataFragment *F, MCFixup McFixup)
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: Sym(McSym), Fixup(McFixup), DF(F) {}
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};
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SmallVector<PendingMCFixup, 2> PendingFixups;
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virtual void emitInstToData(const MCInst &Inst, const MCSubtargetInfo&) = 0;
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void emitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override;
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void emitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override;
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MCSymbol *emitCFILabel() override;
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void emitInstructionImpl(const MCInst &Inst, const MCSubtargetInfo &STI);
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void resolvePendingFixups();
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protected:
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MCObjectStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
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std::unique_ptr<MCObjectWriter> OW,
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std::unique_ptr<MCCodeEmitter> Emitter);
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~MCObjectStreamer();
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public:
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/// state management
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void reset() override;
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/// Object streamers require the integrated assembler.
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bool isIntegratedAssemblerRequired() const override { return true; }
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void emitFrames(MCAsmBackend *MAB);
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void emitCFISections(bool EH, bool Debug) override;
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MCFragment *getCurrentFragment() const;
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void insert(MCFragment *F) {
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flushPendingLabels(F);
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MCSection *CurSection = getCurrentSectionOnly();
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CurSection->getFragmentList().insert(CurInsertionPoint, F);
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F->setParent(CurSection);
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}
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/// Get a data fragment to write into, creating a new one if the current
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/// fragment is not a data fragment.
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/// Optionally a \p STI can be passed in so that a new fragment is created
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/// if the Subtarget differs from the current fragment.
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MCDataFragment *getOrCreateDataFragment(const MCSubtargetInfo* STI = nullptr);
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protected:
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bool changeSectionImpl(MCSection *Section, const MCExpr *Subsection);
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/// Assign a label to the current Section and Subsection even though a
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/// fragment is not yet present. Use flushPendingLabels(F) to associate
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/// a fragment with this label.
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void addPendingLabel(MCSymbol* label);
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/// If any labels have been emitted but not assigned fragments in the current
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/// Section and Subsection, ensure that they get assigned, either to fragment
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/// F if possible or to a new data fragment. Optionally, one can provide an
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/// offset \p FOffset as a symbol offset within the fragment.
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void flushPendingLabels(MCFragment *F, uint64_t FOffset = 0);
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public:
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void visitUsedSymbol(const MCSymbol &Sym) override;
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/// Create a data fragment for any pending labels across all Sections
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/// and Subsections.
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void flushPendingLabels();
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MCAssembler &getAssembler() { return *Assembler; }
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MCAssembler *getAssemblerPtr() override;
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/// \name MCStreamer Interface
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/// @{
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void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
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virtual void emitLabelAtPos(MCSymbol *Symbol, SMLoc Loc, MCFragment *F,
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uint64_t Offset);
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void emitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
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void emitValueImpl(const MCExpr *Value, unsigned Size,
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SMLoc Loc = SMLoc()) override;
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void emitULEB128Value(const MCExpr *Value) override;
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void emitSLEB128Value(const MCExpr *Value) override;
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void emitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
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void changeSection(MCSection *Section, const MCExpr *Subsection) override;
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void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
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/// Emit an instruction to a special fragment, because this instruction
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/// can change its size during relaxation.
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virtual void emitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &);
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void emitBundleAlignMode(unsigned AlignPow2) override;
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void emitBundleLock(bool AlignToEnd) override;
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void emitBundleUnlock() override;
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void emitBytes(StringRef Data) override;
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void emitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
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unsigned ValueSize = 1,
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unsigned MaxBytesToEmit = 0) override;
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void emitCodeAlignment(unsigned ByteAlignment,
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unsigned MaxBytesToEmit = 0) override;
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void emitValueToOffset(const MCExpr *Offset, unsigned char Value,
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SMLoc Loc) override;
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void emitDwarfLocDirective(unsigned FileNo, unsigned Line, unsigned Column,
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unsigned Flags, unsigned Isa,
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unsigned Discriminator,
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StringRef FileName) override;
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void emitDwarfAdvanceLineAddr(int64_t LineDelta, const MCSymbol *LastLabel,
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const MCSymbol *Label,
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unsigned PointerSize) override;
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void emitDwarfLineEndEntry(MCSection *Section, MCSymbol *LastLabel) override;
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void emitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
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const MCSymbol *Label);
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void emitCVLocDirective(unsigned FunctionId, unsigned FileNo, unsigned Line,
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unsigned Column, bool PrologueEnd, bool IsStmt,
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StringRef FileName, SMLoc Loc) override;
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void emitCVLinetableDirective(unsigned FunctionId, const MCSymbol *Begin,
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const MCSymbol *End) override;
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void emitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
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unsigned SourceFileId,
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unsigned SourceLineNum,
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const MCSymbol *FnStartSym,
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const MCSymbol *FnEndSym) override;
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void emitCVDefRangeDirective(
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ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
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StringRef FixedSizePortion) override;
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void emitCVStringTableDirective() override;
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void emitCVFileChecksumsDirective() override;
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void emitCVFileChecksumOffsetDirective(unsigned FileNo) override;
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void emitDTPRel32Value(const MCExpr *Value) override;
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void emitDTPRel64Value(const MCExpr *Value) override;
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void emitTPRel32Value(const MCExpr *Value) override;
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void emitTPRel64Value(const MCExpr *Value) override;
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void emitGPRel32Value(const MCExpr *Value) override;
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void emitGPRel64Value(const MCExpr *Value) override;
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Optional<std::pair<bool, std::string>>
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emitRelocDirective(const MCExpr &Offset, StringRef Name, const MCExpr *Expr,
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SMLoc Loc, const MCSubtargetInfo &STI) override;
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using MCStreamer::emitFill;
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void emitFill(const MCExpr &NumBytes, uint64_t FillValue,
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SMLoc Loc = SMLoc()) override;
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void emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
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SMLoc Loc = SMLoc()) override;
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void emitNops(int64_t NumBytes, int64_t ControlledNopLength,
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SMLoc Loc) override;
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void emitFileDirective(StringRef Filename) override;
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void emitAddrsig() override;
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void emitAddrsigSym(const MCSymbol *Sym) override;
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void finishImpl() override;
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/// Emit the absolute difference between two symbols if possible.
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///
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/// Emit the absolute difference between \c Hi and \c Lo, as long as we can
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/// compute it. Currently, that requires that both symbols are in the same
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/// data fragment and that the target has not specified that diff expressions
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/// require relocations to be emitted. Otherwise, do nothing and return
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/// \c false.
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///
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/// \pre Offset of \c Hi is greater than the offset \c Lo.
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void emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
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unsigned Size) override;
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void emitAbsoluteSymbolDiffAsULEB128(const MCSymbol *Hi,
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const MCSymbol *Lo) override;
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bool mayHaveInstructions(MCSection &Sec) const override;
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};
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} // end namespace llvm
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#endif
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