1 //===- MCAssembler.h - Object File Generation -------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_MC_MCASSEMBLER_H
11 #define LLVM_MC_MCASSEMBLER_H
13 #include "llvm/ADT/DenseMap.h"
14 #include "llvm/ADT/DenseSet.h"
15 #include "llvm/ADT/SmallPtrSet.h"
16 #include "llvm/ADT/SmallString.h"
17 #include "llvm/ADT/ilist.h"
18 #include "llvm/ADT/ilist_node.h"
19 #include "llvm/ADT/iterator.h"
20 #include "llvm/MC/MCDirectives.h"
21 #include "llvm/MC/MCFixup.h"
22 #include "llvm/MC/MCInst.h"
23 #include "llvm/MC/MCLinkerOptimizationHint.h"
24 #include "llvm/MC/MCSection.h"
25 #include "llvm/MC/MCSubtargetInfo.h"
26 #include "llvm/Support/Casting.h"
27 #include "llvm/Support/DataTypes.h"
29 #include <vector> // FIXME: Shouldn't be needed.
41 class MCSubtargetInfo;
45 class MCFragment : public ilist_node<MCFragment> {
46 friend class MCAsmLayout;
48 MCFragment(const MCFragment &) = delete;
49 void operator=(const MCFragment &) = delete;
55 FT_CompactEncodedInst,
68 /// The data for the section this fragment is in.
71 /// Atom - The atom this fragment is in, as represented by it's defining
75 /// \name Assembler Backend Data
78 // FIXME: This could all be kept private to the assembler implementation.
80 /// Offset - The offset of this fragment in its section. This is ~0 until
84 /// LayoutOrder - The layout order of this fragment.
90 MCFragment(FragmentType Kind, MCSection *Parent = nullptr);
95 virtual ~MCFragment();
97 FragmentType getKind() const { return Kind; }
99 MCSection *getParent() const { return Parent; }
100 void setParent(MCSection *Value) { Parent = Value; }
102 const MCSymbol *getAtom() const { return Atom; }
103 void setAtom(const MCSymbol *Value) { Atom = Value; }
105 unsigned getLayoutOrder() const { return LayoutOrder; }
106 void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
108 /// \brief Does this fragment have instructions emitted into it? By default
109 /// this is false, but specific fragment types may set it to true.
110 virtual bool hasInstructions() const { return false; }
112 /// \brief Should this fragment be placed at the end of an aligned bundle?
113 virtual bool alignToBundleEnd() const { return false; }
114 virtual void setAlignToBundleEnd(bool V) {}
116 /// \brief Get the padding size that must be inserted before this fragment.
117 /// Used for bundling. By default, no padding is inserted.
118 /// Note that padding size is restricted to 8 bits. This is an optimization
119 /// to reduce the amount of space used for each fragment. In practice, larger
120 /// padding should never be required.
121 virtual uint8_t getBundlePadding() const { return 0; }
123 /// \brief Set the padding size for this fragment. By default it's a no-op,
124 /// and only some fragments have a meaningful implementation.
125 virtual void setBundlePadding(uint8_t N) {}
130 /// Interface implemented by fragments that contain encoded instructions and/or
133 class MCEncodedFragment : public MCFragment {
134 virtual void anchor();
136 uint8_t BundlePadding;
139 MCEncodedFragment(MCFragment::FragmentType FType, MCSection *Sec = nullptr)
140 : MCFragment(FType, Sec), BundlePadding(0) {}
141 ~MCEncodedFragment() override;
143 virtual SmallVectorImpl<char> &getContents() = 0;
144 virtual const SmallVectorImpl<char> &getContents() const = 0;
146 uint8_t getBundlePadding() const override { return BundlePadding; }
148 void setBundlePadding(uint8_t N) override { BundlePadding = N; }
150 static bool classof(const MCFragment *F) {
151 MCFragment::FragmentType Kind = F->getKind();
155 case MCFragment::FT_Relaxable:
156 case MCFragment::FT_CompactEncodedInst:
157 case MCFragment::FT_Data:
163 /// Interface implemented by fragments that contain encoded instructions and/or
164 /// data and also have fixups registered.
166 class MCEncodedFragmentWithFixups : public MCEncodedFragment {
167 void anchor() override;
170 MCEncodedFragmentWithFixups(MCFragment::FragmentType FType,
171 MCSection *Sec = nullptr)
172 : MCEncodedFragment(FType, Sec) {}
174 ~MCEncodedFragmentWithFixups() override;
176 typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
177 typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
179 virtual SmallVectorImpl<MCFixup> &getFixups() = 0;
180 virtual const SmallVectorImpl<MCFixup> &getFixups() const = 0;
182 virtual fixup_iterator fixup_begin() = 0;
183 virtual const_fixup_iterator fixup_begin() const = 0;
184 virtual fixup_iterator fixup_end() = 0;
185 virtual const_fixup_iterator fixup_end() const = 0;
187 static bool classof(const MCFragment *F) {
188 MCFragment::FragmentType Kind = F->getKind();
189 return Kind == MCFragment::FT_Relaxable || Kind == MCFragment::FT_Data;
193 /// Fragment for data and encoded instructions.
195 class MCDataFragment : public MCEncodedFragmentWithFixups {
196 void anchor() override;
198 /// \brief Does this fragment contain encoded instructions anywhere in it?
199 bool HasInstructions;
201 /// \brief Should this fragment be aligned to the end of a bundle?
202 bool AlignToBundleEnd;
204 SmallVector<char, 32> Contents;
206 /// Fixups - The list of fixups in this fragment.
207 SmallVector<MCFixup, 4> Fixups;
210 MCDataFragment(MCSection *Sec = nullptr)
211 : MCEncodedFragmentWithFixups(FT_Data, Sec), HasInstructions(false),
212 AlignToBundleEnd(false) {}
214 SmallVectorImpl<char> &getContents() override { return Contents; }
215 const SmallVectorImpl<char> &getContents() const override { return Contents; }
217 SmallVectorImpl<MCFixup> &getFixups() override { return Fixups; }
219 const SmallVectorImpl<MCFixup> &getFixups() const override { return Fixups; }
221 bool hasInstructions() const override { return HasInstructions; }
222 virtual void setHasInstructions(bool V) { HasInstructions = V; }
224 bool alignToBundleEnd() const override { return AlignToBundleEnd; }
225 void setAlignToBundleEnd(bool V) override { AlignToBundleEnd = V; }
227 fixup_iterator fixup_begin() override { return Fixups.begin(); }
228 const_fixup_iterator fixup_begin() const override { return Fixups.begin(); }
230 fixup_iterator fixup_end() override { return Fixups.end(); }
231 const_fixup_iterator fixup_end() const override { return Fixups.end(); }
233 static bool classof(const MCFragment *F) {
234 return F->getKind() == MCFragment::FT_Data;
238 /// This is a compact (memory-size-wise) fragment for holding an encoded
239 /// instruction (non-relaxable) that has no fixups registered. When applicable,
240 /// it can be used instead of MCDataFragment and lead to lower memory
243 class MCCompactEncodedInstFragment : public MCEncodedFragment {
244 void anchor() override;
246 /// \brief Should this fragment be aligned to the end of a bundle?
247 bool AlignToBundleEnd;
249 SmallVector<char, 4> Contents;
252 MCCompactEncodedInstFragment(MCSection *Sec = nullptr)
253 : MCEncodedFragment(FT_CompactEncodedInst, Sec), AlignToBundleEnd(false) {
256 bool hasInstructions() const override { return true; }
258 SmallVectorImpl<char> &getContents() override { return Contents; }
259 const SmallVectorImpl<char> &getContents() const override { return Contents; }
261 bool alignToBundleEnd() const override { return AlignToBundleEnd; }
262 void setAlignToBundleEnd(bool V) override { AlignToBundleEnd = V; }
264 static bool classof(const MCFragment *F) {
265 return F->getKind() == MCFragment::FT_CompactEncodedInst;
269 /// A relaxable fragment holds on to its MCInst, since it may need to be
270 /// relaxed during the assembler layout and relaxation stage.
272 class MCRelaxableFragment : public MCEncodedFragmentWithFixups {
273 void anchor() override;
275 /// Inst - The instruction this is a fragment for.
278 /// STI - The MCSubtargetInfo in effect when the instruction was encoded.
279 /// Keep a copy instead of a reference to make sure that updates to STI
280 /// in the assembler are not seen here.
281 const MCSubtargetInfo STI;
283 /// Contents - Binary data for the currently encoded instruction.
284 SmallVector<char, 8> Contents;
286 /// Fixups - The list of fixups in this fragment.
287 SmallVector<MCFixup, 1> Fixups;
290 MCRelaxableFragment(const MCInst &Inst, const MCSubtargetInfo &STI,
291 MCSection *Sec = nullptr)
292 : MCEncodedFragmentWithFixups(FT_Relaxable, Sec), Inst(Inst), STI(STI) {}
294 SmallVectorImpl<char> &getContents() override { return Contents; }
295 const SmallVectorImpl<char> &getContents() const override { return Contents; }
297 const MCInst &getInst() const { return Inst; }
298 void setInst(const MCInst &Value) { Inst = Value; }
300 const MCSubtargetInfo &getSubtargetInfo() { return STI; }
302 SmallVectorImpl<MCFixup> &getFixups() override { return Fixups; }
304 const SmallVectorImpl<MCFixup> &getFixups() const override { return Fixups; }
306 bool hasInstructions() const override { return true; }
308 fixup_iterator fixup_begin() override { return Fixups.begin(); }
309 const_fixup_iterator fixup_begin() const override { return Fixups.begin(); }
311 fixup_iterator fixup_end() override { return Fixups.end(); }
312 const_fixup_iterator fixup_end() const override { return Fixups.end(); }
314 static bool classof(const MCFragment *F) {
315 return F->getKind() == MCFragment::FT_Relaxable;
319 class MCAlignFragment : public MCFragment {
320 virtual void anchor();
322 /// Alignment - The alignment to ensure, in bytes.
325 /// Value - Value to use for filling padding bytes.
328 /// ValueSize - The size of the integer (in bytes) of \p Value.
331 /// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment
332 /// cannot be satisfied in this width then this fragment is ignored.
333 unsigned MaxBytesToEmit;
335 /// EmitNops - Flag to indicate that (optimal) NOPs should be emitted instead
336 /// of using the provided value. The exact interpretation of this flag is
337 /// target dependent.
341 MCAlignFragment(unsigned Alignment, int64_t Value, unsigned ValueSize,
342 unsigned MaxBytesToEmit, MCSection *Sec = nullptr)
343 : MCFragment(FT_Align, Sec), Alignment(Alignment), Value(Value),
344 ValueSize(ValueSize), MaxBytesToEmit(MaxBytesToEmit), EmitNops(false) {}
349 unsigned getAlignment() const { return Alignment; }
351 int64_t getValue() const { return Value; }
353 unsigned getValueSize() const { return ValueSize; }
355 unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; }
357 bool hasEmitNops() const { return EmitNops; }
358 void setEmitNops(bool Value) { EmitNops = Value; }
362 static bool classof(const MCFragment *F) {
363 return F->getKind() == MCFragment::FT_Align;
367 class MCFillFragment : public MCFragment {
368 virtual void anchor();
370 /// Value - Value to use for filling bytes.
373 /// ValueSize - The size (in bytes) of \p Value to use when filling, or 0 if
374 /// this is a virtual fill fragment.
377 /// Size - The number of bytes to insert.
381 MCFillFragment(int64_t Value, unsigned ValueSize, uint64_t Size,
382 MCSection *Sec = nullptr)
383 : MCFragment(FT_Fill, Sec), Value(Value), ValueSize(ValueSize),
385 assert((!ValueSize || (Size % ValueSize) == 0) &&
386 "Fill size must be a multiple of the value size!");
392 int64_t getValue() const { return Value; }
394 unsigned getValueSize() const { return ValueSize; }
396 uint64_t getSize() const { return Size; }
400 static bool classof(const MCFragment *F) {
401 return F->getKind() == MCFragment::FT_Fill;
405 class MCOrgFragment : public MCFragment {
406 virtual void anchor();
408 /// Offset - The offset this fragment should start at.
409 const MCExpr *Offset;
411 /// Value - Value to use for filling bytes.
415 MCOrgFragment(const MCExpr &Offset, int8_t Value, MCSection *Sec = nullptr)
416 : MCFragment(FT_Org, Sec), Offset(&Offset), Value(Value) {}
421 const MCExpr &getOffset() const { return *Offset; }
423 uint8_t getValue() const { return Value; }
427 static bool classof(const MCFragment *F) {
428 return F->getKind() == MCFragment::FT_Org;
432 class MCLEBFragment : public MCFragment {
433 virtual void anchor();
435 /// Value - The value this fragment should contain.
438 /// IsSigned - True if this is a sleb128, false if uleb128.
441 SmallString<8> Contents;
444 MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSection *Sec = nullptr)
445 : MCFragment(FT_LEB, Sec), Value(&Value_), IsSigned(IsSigned_) {
446 Contents.push_back(0);
452 const MCExpr &getValue() const { return *Value; }
454 bool isSigned() const { return IsSigned; }
456 SmallString<8> &getContents() { return Contents; }
457 const SmallString<8> &getContents() const { return Contents; }
461 static bool classof(const MCFragment *F) {
462 return F->getKind() == MCFragment::FT_LEB;
466 class MCDwarfLineAddrFragment : public MCFragment {
467 virtual void anchor();
469 /// LineDelta - the value of the difference between the two line numbers
470 /// between two .loc dwarf directives.
473 /// AddrDelta - The expression for the difference of the two symbols that
474 /// make up the address delta between two .loc dwarf directives.
475 const MCExpr *AddrDelta;
477 SmallString<8> Contents;
480 MCDwarfLineAddrFragment(int64_t LineDelta, const MCExpr &AddrDelta,
481 MCSection *Sec = nullptr)
482 : MCFragment(FT_Dwarf, Sec), LineDelta(LineDelta), AddrDelta(&AddrDelta) {
483 Contents.push_back(0);
489 int64_t getLineDelta() const { return LineDelta; }
491 const MCExpr &getAddrDelta() const { return *AddrDelta; }
493 SmallString<8> &getContents() { return Contents; }
494 const SmallString<8> &getContents() const { return Contents; }
498 static bool classof(const MCFragment *F) {
499 return F->getKind() == MCFragment::FT_Dwarf;
503 class MCDwarfCallFrameFragment : public MCFragment {
504 virtual void anchor();
506 /// AddrDelta - The expression for the difference of the two symbols that
507 /// make up the address delta between two .cfi_* dwarf directives.
508 const MCExpr *AddrDelta;
510 SmallString<8> Contents;
513 MCDwarfCallFrameFragment(const MCExpr &AddrDelta, MCSection *Sec = nullptr)
514 : MCFragment(FT_DwarfFrame, Sec), AddrDelta(&AddrDelta) {
515 Contents.push_back(0);
521 const MCExpr &getAddrDelta() const { return *AddrDelta; }
523 SmallString<8> &getContents() { return Contents; }
524 const SmallString<8> &getContents() const { return Contents; }
528 static bool classof(const MCFragment *F) {
529 return F->getKind() == MCFragment::FT_DwarfFrame;
533 class MCSafeSEHFragment : public MCFragment {
534 virtual void anchor();
539 MCSafeSEHFragment(const MCSymbol *Sym, MCSection *Sec = nullptr)
540 : MCFragment(FT_SafeSEH, Sec), Sym(Sym) {}
545 const MCSymbol *getSymbol() { return Sym; }
546 const MCSymbol *getSymbol() const { return Sym; }
550 static bool classof(const MCFragment *F) {
551 return F->getKind() == MCFragment::FT_SafeSEH;
555 // FIXME: This really doesn't belong here. See comments below.
556 struct IndirectSymbolData {
561 // FIXME: Ditto this. Purely so the Streamer and the ObjectWriter can talk
563 struct DataRegionData {
564 // This enum should be kept in sync w/ the mach-o definition in
565 // llvm/Object/MachOFormat.h.
566 enum KindTy { Data = 1, JumpTable8, JumpTable16, JumpTable32 } Kind;
572 friend class MCAsmLayout;
575 typedef std::vector<MCSection *> SectionListType;
576 typedef std::vector<const MCSymbol *> SymbolDataListType;
578 typedef pointee_iterator<SectionListType::const_iterator> const_iterator;
579 typedef pointee_iterator<SectionListType::iterator> iterator;
581 typedef pointee_iterator<SymbolDataListType::const_iterator>
582 const_symbol_iterator;
583 typedef pointee_iterator<SymbolDataListType::iterator> symbol_iterator;
585 typedef iterator_range<symbol_iterator> symbol_range;
586 typedef iterator_range<const_symbol_iterator> const_symbol_range;
588 typedef std::vector<IndirectSymbolData>::const_iterator
589 const_indirect_symbol_iterator;
590 typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator;
592 typedef std::vector<DataRegionData>::const_iterator
593 const_data_region_iterator;
594 typedef std::vector<DataRegionData>::iterator data_region_iterator;
596 /// MachO specific deployment target version info.
597 // A Major version of 0 indicates that no version information was supplied
598 // and so the corresponding load command should not be emitted.
600 MCVersionMinType Kind;
604 } VersionMinInfoType;
607 MCAssembler(const MCAssembler &) = delete;
608 void operator=(const MCAssembler &) = delete;
612 MCAsmBackend &Backend;
614 MCCodeEmitter &Emitter;
616 MCObjectWriter &Writer;
620 SectionListType Sections;
622 SymbolDataListType Symbols;
624 DenseSet<const MCSymbol *> LocalsUsedInReloc;
626 std::vector<IndirectSymbolData> IndirectSymbols;
628 std::vector<DataRegionData> DataRegions;
630 /// The list of linker options to propagate into the object file.
631 std::vector<std::vector<std::string>> LinkerOptions;
633 /// List of declared file names
634 std::vector<std::string> FileNames;
636 /// The set of function symbols for which a .thumb_func directive has
639 // FIXME: We really would like this in target specific code rather than
640 // here. Maybe when the relocation stuff moves to target specific,
641 // this can go with it? The streamer would need some target specific
643 mutable SmallPtrSet<const MCSymbol *, 64> ThumbFuncs;
645 /// \brief The bundle alignment size currently set in the assembler.
647 /// By default it's 0, which means bundling is disabled.
648 unsigned BundleAlignSize;
650 unsigned RelaxAll : 1;
651 unsigned SubsectionsViaSymbols : 1;
653 /// ELF specific e_header flags
654 // It would be good if there were an MCELFAssembler class to hold this.
655 // ELF header flags are used both by the integrated and standalone assemblers.
656 // Access to the flags is necessary in cases where assembler directives affect
657 // which flags to be set.
658 unsigned ELFHeaderEFlags;
660 /// Used to communicate Linker Optimization Hint information between
661 /// the Streamer and the .o writer
662 MCLOHContainer LOHContainer;
664 VersionMinInfoType VersionMinInfo;
667 /// Evaluate a fixup to a relocatable expression and the value which should be
668 /// placed into the fixup.
670 /// \param Layout The layout to use for evaluation.
671 /// \param Fixup The fixup to evaluate.
672 /// \param DF The fragment the fixup is inside.
673 /// \param Target [out] On return, the relocatable expression the fixup
675 /// \param Value [out] On return, the value of the fixup as currently laid
677 /// \return Whether the fixup value was fully resolved. This is true if the
678 /// \p Value result is fixed, otherwise the value may change due to
680 bool evaluateFixup(const MCAsmLayout &Layout, const MCFixup &Fixup,
681 const MCFragment *DF, MCValue &Target,
682 uint64_t &Value) const;
684 /// Check whether a fixup can be satisfied, or whether it needs to be relaxed
685 /// (increased in size, in order to hold its value correctly).
686 bool fixupNeedsRelaxation(const MCFixup &Fixup, const MCRelaxableFragment *DF,
687 const MCAsmLayout &Layout) const;
689 /// Check whether the given fragment needs relaxation.
690 bool fragmentNeedsRelaxation(const MCRelaxableFragment *IF,
691 const MCAsmLayout &Layout) const;
693 /// \brief Perform one layout iteration and return true if any offsets
695 bool layoutOnce(MCAsmLayout &Layout);
697 /// \brief Perform one layout iteration of the given section and return true
698 /// if any offsets were adjusted.
699 bool layoutSectionOnce(MCAsmLayout &Layout, MCSection &Sec);
701 bool relaxInstruction(MCAsmLayout &Layout, MCRelaxableFragment &IF);
703 bool relaxLEB(MCAsmLayout &Layout, MCLEBFragment &IF);
705 bool relaxDwarfLineAddr(MCAsmLayout &Layout, MCDwarfLineAddrFragment &DF);
706 bool relaxDwarfCallFrameFragment(MCAsmLayout &Layout,
707 MCDwarfCallFrameFragment &DF);
709 /// finishLayout - Finalize a layout, including fragment lowering.
710 void finishLayout(MCAsmLayout &Layout);
712 std::pair<uint64_t, bool> handleFixup(const MCAsmLayout &Layout,
713 MCFragment &F, const MCFixup &Fixup);
716 void addLocalUsedInReloc(const MCSymbol &Sym);
717 bool isLocalUsedInReloc(const MCSymbol &Sym) const;
719 /// Compute the effective fragment size assuming it is laid out at the given
720 /// \p SectionAddress and \p FragmentOffset.
721 uint64_t computeFragmentSize(const MCAsmLayout &Layout,
722 const MCFragment &F) const;
724 /// Find the symbol which defines the atom containing the given symbol, or
725 /// null if there is no such symbol.
726 const MCSymbol *getAtom(const MCSymbol &S) const;
728 /// Check whether a particular symbol is visible to the linker and is required
729 /// in the symbol table, or whether it can be discarded by the assembler. This
730 /// also effects whether the assembler treats the label as potentially
731 /// defining a separate atom.
732 bool isSymbolLinkerVisible(const MCSymbol &SD) const;
734 /// Emit the section contents using the given object writer.
735 void writeSectionData(const MCSection *Section,
736 const MCAsmLayout &Layout) const;
738 /// Check whether a given symbol has been flagged with .thumb_func.
739 bool isThumbFunc(const MCSymbol *Func) const;
741 /// Flag a function symbol as the target of a .thumb_func directive.
742 void setIsThumbFunc(const MCSymbol *Func) { ThumbFuncs.insert(Func); }
744 /// ELF e_header flags
745 unsigned getELFHeaderEFlags() const { return ELFHeaderEFlags; }
746 void setELFHeaderEFlags(unsigned Flags) { ELFHeaderEFlags = Flags; }
748 /// MachO deployment target version information.
749 const VersionMinInfoType &getVersionMinInfo() const { return VersionMinInfo; }
750 void setVersionMinInfo(MCVersionMinType Kind, unsigned Major, unsigned Minor,
752 VersionMinInfo.Kind = Kind;
753 VersionMinInfo.Major = Major;
754 VersionMinInfo.Minor = Minor;
755 VersionMinInfo.Update = Update;
759 /// Construct a new assembler instance.
761 /// \param OS The stream to output to.
763 // FIXME: How are we going to parameterize this? Two obvious options are stay
764 // concrete and require clients to pass in a target like object. The other
765 // option is to make this abstract, and have targets provide concrete
766 // implementations as we do with AsmParser.
767 MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
768 MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
772 /// Reuse an assembler instance
776 MCContext &getContext() const { return Context; }
778 MCAsmBackend &getBackend() const { return Backend; }
780 MCCodeEmitter &getEmitter() const { return Emitter; }
782 MCObjectWriter &getWriter() const { return Writer; }
784 /// Finish - Do final processing and write the object to the output stream.
785 /// \p Writer is used for custom object writer (as the MCJIT does),
786 /// if not specified it is automatically created from backend.
789 // FIXME: This does not belong here.
790 bool getSubsectionsViaSymbols() const { return SubsectionsViaSymbols; }
791 void setSubsectionsViaSymbols(bool Value) { SubsectionsViaSymbols = Value; }
793 bool getRelaxAll() const { return RelaxAll; }
794 void setRelaxAll(bool Value) { RelaxAll = Value; }
796 bool isBundlingEnabled() const { return BundleAlignSize != 0; }
798 unsigned getBundleAlignSize() const { return BundleAlignSize; }
800 void setBundleAlignSize(unsigned Size) {
801 assert((Size == 0 || !(Size & (Size - 1))) &&
802 "Expect a power-of-two bundle align size");
803 BundleAlignSize = Size;
806 /// \name Section List Access
809 iterator begin() { return Sections.begin(); }
810 const_iterator begin() const { return Sections.begin(); }
812 iterator end() { return Sections.end(); }
813 const_iterator end() const { return Sections.end(); }
815 size_t size() const { return Sections.size(); }
818 /// \name Symbol List Access
820 symbol_iterator symbol_begin() { return Symbols.begin(); }
821 const_symbol_iterator symbol_begin() const { return Symbols.begin(); }
823 symbol_iterator symbol_end() { return Symbols.end(); }
824 const_symbol_iterator symbol_end() const { return Symbols.end(); }
826 symbol_range symbols() { return make_range(symbol_begin(), symbol_end()); }
827 const_symbol_range symbols() const {
828 return make_range(symbol_begin(), symbol_end());
831 size_t symbol_size() const { return Symbols.size(); }
834 /// \name Indirect Symbol List Access
837 // FIXME: This is a total hack, this should not be here. Once things are
838 // factored so that the streamer has direct access to the .o writer, it can
840 std::vector<IndirectSymbolData> &getIndirectSymbols() {
841 return IndirectSymbols;
844 indirect_symbol_iterator indirect_symbol_begin() {
845 return IndirectSymbols.begin();
847 const_indirect_symbol_iterator indirect_symbol_begin() const {
848 return IndirectSymbols.begin();
851 indirect_symbol_iterator indirect_symbol_end() {
852 return IndirectSymbols.end();
854 const_indirect_symbol_iterator indirect_symbol_end() const {
855 return IndirectSymbols.end();
858 size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
861 /// \name Linker Option List Access
864 std::vector<std::vector<std::string>> &getLinkerOptions() {
865 return LinkerOptions;
869 /// \name Data Region List Access
872 // FIXME: This is a total hack, this should not be here. Once things are
873 // factored so that the streamer has direct access to the .o writer, it can
875 std::vector<DataRegionData> &getDataRegions() { return DataRegions; }
877 data_region_iterator data_region_begin() { return DataRegions.begin(); }
878 const_data_region_iterator data_region_begin() const {
879 return DataRegions.begin();
882 data_region_iterator data_region_end() { return DataRegions.end(); }
883 const_data_region_iterator data_region_end() const {
884 return DataRegions.end();
887 size_t data_region_size() const { return DataRegions.size(); }
890 /// \name Data Region List Access
893 // FIXME: This is a total hack, this should not be here. Once things are
894 // factored so that the streamer has direct access to the .o writer, it can
896 MCLOHContainer &getLOHContainer() { return LOHContainer; }
897 const MCLOHContainer &getLOHContainer() const {
898 return const_cast<MCAssembler *>(this)->getLOHContainer();
901 /// \name Backend Data Access
904 bool registerSection(MCSection &Section) {
905 if (Section.isRegistered())
907 Sections.push_back(&Section);
908 Section.setIsRegistered(true);
912 void registerSymbol(const MCSymbol &Symbol, bool *Created = nullptr);
914 ArrayRef<std::string> getFileNames() { return FileNames; }
916 void addFileName(StringRef FileName) {
917 if (std::find(FileNames.begin(), FileNames.end(), FileName) ==
919 FileNames.push_back(FileName);
922 /// \brief Write the necessary bundle padding to the given object writer.
923 /// Expects a fragment \p F containing instructions and its size \p FSize.
924 void writeFragmentPadding(const MCFragment &F, uint64_t FSize,
925 MCObjectWriter *OW) const;
932 /// \brief Compute the amount of padding required before the fragment \p F to
933 /// obey bundling restrictions, where \p FOffset is the fragment's offset in
934 /// its section and \p FSize is the fragment's size.
935 uint64_t computeBundlePadding(const MCAssembler &Assembler, const MCFragment *F,
936 uint64_t FOffset, uint64_t FSize);
938 } // end namespace llvm