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/MCDwarf.h"
22 #include "llvm/MC/MCFixup.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/MC/MCLinkerOptimizationHint.h"
25 #include "llvm/MC/MCSection.h"
26 #include "llvm/MC/MCSubtargetInfo.h"
27 #include "llvm/Support/Casting.h"
28 #include "llvm/Support/DataTypes.h"
30 #include <vector> // FIXME: Shouldn't be needed.
42 class MCSubtargetInfo;
46 class MCFragment : public ilist_node<MCFragment> {
47 friend class MCAsmLayout;
49 MCFragment(const MCFragment &) = delete;
50 void operator=(const MCFragment &) = delete;
53 enum FragmentType : uint8_t {
56 FT_CompactEncodedInst,
73 /// \brief Should this fragment be aligned to the end of a bundle?
74 bool AlignToBundleEnd;
76 uint8_t BundlePadding;
78 /// LayoutOrder - The layout order of this fragment.
81 /// The data for the section this fragment is in.
84 /// Atom - The atom this fragment is in, as represented by it's defining
88 /// \name Assembler Backend Data
91 // FIXME: This could all be kept private to the assembler implementation.
93 /// Offset - The offset of this fragment in its section. This is ~0 until
100 MCFragment(FragmentType Kind, bool HasInstructions,
101 uint8_t BundlePadding, MCSection *Parent = nullptr);
106 // This is a friend so that the sentinal can be created.
107 friend struct ilist_sentinel_traits<MCFragment>;
111 /// Destroys the current fragment.
113 /// This must be used instead of delete as MCFragment is non-virtual.
114 /// This method will dispatch to the appropriate subclass.
117 FragmentType getKind() const { return Kind; }
119 MCSection *getParent() const { return Parent; }
120 void setParent(MCSection *Value) { Parent = Value; }
122 const MCSymbol *getAtom() const { return Atom; }
123 void setAtom(const MCSymbol *Value) { Atom = Value; }
125 unsigned getLayoutOrder() const { return LayoutOrder; }
126 void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
128 /// \brief Does this fragment have instructions emitted into it? By default
129 /// this is false, but specific fragment types may set it to true.
130 bool hasInstructions() const { return HasInstructions; }
132 /// \brief Should this fragment be placed at the end of an aligned bundle?
133 bool alignToBundleEnd() const { return AlignToBundleEnd; }
134 void setAlignToBundleEnd(bool V) { AlignToBundleEnd = V; }
136 /// \brief Get the padding size that must be inserted before this fragment.
137 /// Used for bundling. By default, no padding is inserted.
138 /// Note that padding size is restricted to 8 bits. This is an optimization
139 /// to reduce the amount of space used for each fragment. In practice, larger
140 /// padding should never be required.
141 uint8_t getBundlePadding() const { return BundlePadding; }
143 /// \brief Set the padding size for this fragment. By default it's a no-op,
144 /// and only some fragments have a meaningful implementation.
145 void setBundlePadding(uint8_t N) { BundlePadding = N; }
150 /// Interface implemented by fragments that contain encoded instructions and/or
153 class MCEncodedFragment : public MCFragment {
155 MCEncodedFragment(MCFragment::FragmentType FType, bool HasInstructions,
157 : MCFragment(FType, HasInstructions, 0, Sec) {}
160 static bool classof(const MCFragment *F) {
161 MCFragment::FragmentType Kind = F->getKind();
165 case MCFragment::FT_Relaxable:
166 case MCFragment::FT_CompactEncodedInst:
167 case MCFragment::FT_Data:
173 /// Interface implemented by fragments that contain encoded instructions and/or
176 template<unsigned ContentsSize>
177 class MCEncodedFragmentWithContents : public MCEncodedFragment {
178 SmallVector<char, ContentsSize> Contents;
181 MCEncodedFragmentWithContents(MCFragment::FragmentType FType,
182 bool HasInstructions,
184 : MCEncodedFragment(FType, HasInstructions, Sec) {}
187 SmallVectorImpl<char> &getContents() { return Contents; }
188 const SmallVectorImpl<char> &getContents() const { return Contents; }
191 /// Interface implemented by fragments that contain encoded instructions and/or
192 /// data and also have fixups registered.
194 template<unsigned ContentsSize, unsigned FixupsSize>
195 class MCEncodedFragmentWithFixups :
196 public MCEncodedFragmentWithContents<ContentsSize> {
198 /// Fixups - The list of fixups in this fragment.
199 SmallVector<MCFixup, FixupsSize> Fixups;
202 MCEncodedFragmentWithFixups(MCFragment::FragmentType FType,
203 bool HasInstructions,
205 : MCEncodedFragmentWithContents<ContentsSize>(FType, HasInstructions,
209 typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
210 typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
212 SmallVectorImpl<MCFixup> &getFixups() { return Fixups; }
213 const SmallVectorImpl<MCFixup> &getFixups() const { return Fixups; }
215 fixup_iterator fixup_begin() { return Fixups.begin(); }
216 const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
218 fixup_iterator fixup_end() { return Fixups.end(); }
219 const_fixup_iterator fixup_end() const { return Fixups.end(); }
221 static bool classof(const MCFragment *F) {
222 MCFragment::FragmentType Kind = F->getKind();
223 return Kind == MCFragment::FT_Relaxable || Kind == MCFragment::FT_Data;
227 /// Fragment for data and encoded instructions.
229 class MCDataFragment : public MCEncodedFragmentWithFixups<32, 4> {
231 MCDataFragment(MCSection *Sec = nullptr)
232 : MCEncodedFragmentWithFixups<32, 4>(FT_Data, false, Sec) {}
234 void setHasInstructions(bool V) { HasInstructions = V; }
236 static bool classof(const MCFragment *F) {
237 return F->getKind() == MCFragment::FT_Data;
241 /// This is a compact (memory-size-wise) fragment for holding an encoded
242 /// instruction (non-relaxable) that has no fixups registered. When applicable,
243 /// it can be used instead of MCDataFragment and lead to lower memory
246 class MCCompactEncodedInstFragment : public MCEncodedFragmentWithContents<4> {
248 MCCompactEncodedInstFragment(MCSection *Sec = nullptr)
249 : MCEncodedFragmentWithContents(FT_CompactEncodedInst, true, Sec) {
252 static bool classof(const MCFragment *F) {
253 return F->getKind() == MCFragment::FT_CompactEncodedInst;
257 /// A relaxable fragment holds on to its MCInst, since it may need to be
258 /// relaxed during the assembler layout and relaxation stage.
260 class MCRelaxableFragment : public MCEncodedFragmentWithFixups<8, 1> {
262 /// Inst - The instruction this is a fragment for.
265 /// STI - The MCSubtargetInfo in effect when the instruction was encoded.
266 /// Keep a copy instead of a reference to make sure that updates to STI
267 /// in the assembler are not seen here.
268 const MCSubtargetInfo STI;
271 MCRelaxableFragment(const MCInst &Inst, const MCSubtargetInfo &STI,
272 MCSection *Sec = nullptr)
273 : MCEncodedFragmentWithFixups(FT_Relaxable, true, Sec),
274 Inst(Inst), STI(STI) {}
276 const MCInst &getInst() const { return Inst; }
277 void setInst(const MCInst &Value) { Inst = Value; }
279 const MCSubtargetInfo &getSubtargetInfo() { return STI; }
281 static bool classof(const MCFragment *F) {
282 return F->getKind() == MCFragment::FT_Relaxable;
286 class MCAlignFragment : public MCFragment {
288 /// Alignment - The alignment to ensure, in bytes.
291 /// EmitNops - Flag to indicate that (optimal) NOPs should be emitted instead
292 /// of using the provided value. The exact interpretation of this flag is
293 /// target dependent.
296 /// Value - Value to use for filling padding bytes.
299 /// ValueSize - The size of the integer (in bytes) of \p Value.
302 /// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment
303 /// cannot be satisfied in this width then this fragment is ignored.
304 unsigned MaxBytesToEmit;
307 MCAlignFragment(unsigned Alignment, int64_t Value, unsigned ValueSize,
308 unsigned MaxBytesToEmit, MCSection *Sec = nullptr)
309 : MCFragment(FT_Align, false, 0, Sec), Alignment(Alignment),
310 EmitNops(false), Value(Value),
311 ValueSize(ValueSize), MaxBytesToEmit(MaxBytesToEmit) {}
316 unsigned getAlignment() const { return Alignment; }
318 int64_t getValue() const { return Value; }
320 unsigned getValueSize() const { return ValueSize; }
322 unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; }
324 bool hasEmitNops() const { return EmitNops; }
325 void setEmitNops(bool Value) { EmitNops = Value; }
329 static bool classof(const MCFragment *F) {
330 return F->getKind() == MCFragment::FT_Align;
334 class MCFillFragment : public MCFragment {
336 /// Value - Value to use for filling bytes.
339 /// ValueSize - The size (in bytes) of \p Value to use when filling, or 0 if
340 /// this is a virtual fill fragment.
343 /// Size - The number of bytes to insert.
347 MCFillFragment(int64_t Value, unsigned ValueSize, uint64_t Size,
348 MCSection *Sec = nullptr)
349 : MCFragment(FT_Fill, false, 0, Sec), Value(Value), ValueSize(ValueSize),
351 assert((!ValueSize || (Size % ValueSize) == 0) &&
352 "Fill size must be a multiple of the value size!");
358 int64_t getValue() const { return Value; }
360 unsigned getValueSize() const { return ValueSize; }
362 uint64_t getSize() const { return Size; }
366 static bool classof(const MCFragment *F) {
367 return F->getKind() == MCFragment::FT_Fill;
371 class MCOrgFragment : public MCFragment {
373 /// Offset - The offset this fragment should start at.
374 const MCExpr *Offset;
376 /// Value - Value to use for filling bytes.
380 MCOrgFragment(const MCExpr &Offset, int8_t Value, MCSection *Sec = nullptr)
381 : MCFragment(FT_Org, false, 0, Sec), Offset(&Offset), Value(Value) {}
386 const MCExpr &getOffset() const { return *Offset; }
388 uint8_t getValue() const { return Value; }
392 static bool classof(const MCFragment *F) {
393 return F->getKind() == MCFragment::FT_Org;
397 class MCLEBFragment : public MCFragment {
399 /// Value - The value this fragment should contain.
402 /// IsSigned - True if this is a sleb128, false if uleb128.
405 SmallString<8> Contents;
408 MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSection *Sec = nullptr)
409 : MCFragment(FT_LEB, false, 0, Sec), Value(&Value_), IsSigned(IsSigned_) {
410 Contents.push_back(0);
416 const MCExpr &getValue() const { return *Value; }
418 bool isSigned() const { return IsSigned; }
420 SmallString<8> &getContents() { return Contents; }
421 const SmallString<8> &getContents() const { return Contents; }
425 static bool classof(const MCFragment *F) {
426 return F->getKind() == MCFragment::FT_LEB;
430 class MCDwarfLineAddrFragment : public MCFragment {
432 /// LineDelta - the value of the difference between the two line numbers
433 /// between two .loc dwarf directives.
436 /// AddrDelta - The expression for the difference of the two symbols that
437 /// make up the address delta between two .loc dwarf directives.
438 const MCExpr *AddrDelta;
440 SmallString<8> Contents;
443 MCDwarfLineAddrFragment(int64_t LineDelta, const MCExpr &AddrDelta,
444 MCSection *Sec = nullptr)
445 : MCFragment(FT_Dwarf, false, 0, Sec), LineDelta(LineDelta),
446 AddrDelta(&AddrDelta) {
447 Contents.push_back(0);
453 int64_t getLineDelta() const { return LineDelta; }
455 const MCExpr &getAddrDelta() const { return *AddrDelta; }
457 SmallString<8> &getContents() { return Contents; }
458 const SmallString<8> &getContents() const { return Contents; }
462 static bool classof(const MCFragment *F) {
463 return F->getKind() == MCFragment::FT_Dwarf;
467 class MCDwarfCallFrameFragment : public MCFragment {
469 /// AddrDelta - The expression for the difference of the two symbols that
470 /// make up the address delta between two .cfi_* dwarf directives.
471 const MCExpr *AddrDelta;
473 SmallString<8> Contents;
476 MCDwarfCallFrameFragment(const MCExpr &AddrDelta, MCSection *Sec = nullptr)
477 : MCFragment(FT_DwarfFrame, false, 0, Sec), AddrDelta(&AddrDelta) {
478 Contents.push_back(0);
484 const MCExpr &getAddrDelta() const { return *AddrDelta; }
486 SmallString<8> &getContents() { return Contents; }
487 const SmallString<8> &getContents() const { return Contents; }
491 static bool classof(const MCFragment *F) {
492 return F->getKind() == MCFragment::FT_DwarfFrame;
496 class MCSafeSEHFragment : public MCFragment {
500 MCSafeSEHFragment(const MCSymbol *Sym, MCSection *Sec = nullptr)
501 : MCFragment(FT_SafeSEH, false, 0, Sec), Sym(Sym) {}
506 const MCSymbol *getSymbol() { return Sym; }
507 const MCSymbol *getSymbol() const { return Sym; }
511 static bool classof(const MCFragment *F) {
512 return F->getKind() == MCFragment::FT_SafeSEH;
516 // FIXME: This really doesn't belong here. See comments below.
517 struct IndirectSymbolData {
522 // FIXME: Ditto this. Purely so the Streamer and the ObjectWriter can talk
524 struct DataRegionData {
525 // This enum should be kept in sync w/ the mach-o definition in
526 // llvm/Object/MachOFormat.h.
527 enum KindTy { Data = 1, JumpTable8, JumpTable16, JumpTable32 } Kind;
533 friend class MCAsmLayout;
536 typedef std::vector<MCSection *> SectionListType;
537 typedef std::vector<const MCSymbol *> SymbolDataListType;
539 typedef pointee_iterator<SectionListType::const_iterator> const_iterator;
540 typedef pointee_iterator<SectionListType::iterator> iterator;
542 typedef pointee_iterator<SymbolDataListType::const_iterator>
543 const_symbol_iterator;
544 typedef pointee_iterator<SymbolDataListType::iterator> symbol_iterator;
546 typedef iterator_range<symbol_iterator> symbol_range;
547 typedef iterator_range<const_symbol_iterator> const_symbol_range;
549 typedef std::vector<IndirectSymbolData>::const_iterator
550 const_indirect_symbol_iterator;
551 typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator;
553 typedef std::vector<DataRegionData>::const_iterator
554 const_data_region_iterator;
555 typedef std::vector<DataRegionData>::iterator data_region_iterator;
557 /// MachO specific deployment target version info.
558 // A Major version of 0 indicates that no version information was supplied
559 // and so the corresponding load command should not be emitted.
561 MCVersionMinType Kind;
565 } VersionMinInfoType;
568 MCAssembler(const MCAssembler &) = delete;
569 void operator=(const MCAssembler &) = delete;
573 MCAsmBackend &Backend;
575 MCCodeEmitter &Emitter;
577 MCObjectWriter &Writer;
581 SectionListType Sections;
583 SymbolDataListType Symbols;
585 std::vector<IndirectSymbolData> IndirectSymbols;
587 std::vector<DataRegionData> DataRegions;
589 /// The list of linker options to propagate into the object file.
590 std::vector<std::vector<std::string>> LinkerOptions;
592 /// List of declared file names
593 std::vector<std::string> FileNames;
595 MCDwarfLineTableParams LTParams;
597 /// The set of function symbols for which a .thumb_func directive has
600 // FIXME: We really would like this in target specific code rather than
601 // here. Maybe when the relocation stuff moves to target specific,
602 // this can go with it? The streamer would need some target specific
604 mutable SmallPtrSet<const MCSymbol *, 64> ThumbFuncs;
606 /// \brief The bundle alignment size currently set in the assembler.
608 /// By default it's 0, which means bundling is disabled.
609 unsigned BundleAlignSize;
611 unsigned RelaxAll : 1;
612 unsigned SubsectionsViaSymbols : 1;
614 /// ELF specific e_header flags
615 // It would be good if there were an MCELFAssembler class to hold this.
616 // ELF header flags are used both by the integrated and standalone assemblers.
617 // Access to the flags is necessary in cases where assembler directives affect
618 // which flags to be set.
619 unsigned ELFHeaderEFlags;
621 /// Used to communicate Linker Optimization Hint information between
622 /// the Streamer and the .o writer
623 MCLOHContainer LOHContainer;
625 VersionMinInfoType VersionMinInfo;
628 /// Evaluate a fixup to a relocatable expression and the value which should be
629 /// placed into the fixup.
631 /// \param Layout The layout to use for evaluation.
632 /// \param Fixup The fixup to evaluate.
633 /// \param DF The fragment the fixup is inside.
634 /// \param Target [out] On return, the relocatable expression the fixup
636 /// \param Value [out] On return, the value of the fixup as currently laid
638 /// \return Whether the fixup value was fully resolved. This is true if the
639 /// \p Value result is fixed, otherwise the value may change due to
641 bool evaluateFixup(const MCAsmLayout &Layout, const MCFixup &Fixup,
642 const MCFragment *DF, MCValue &Target,
643 uint64_t &Value) const;
645 /// Check whether a fixup can be satisfied, or whether it needs to be relaxed
646 /// (increased in size, in order to hold its value correctly).
647 bool fixupNeedsRelaxation(const MCFixup &Fixup, const MCRelaxableFragment *DF,
648 const MCAsmLayout &Layout) const;
650 /// Check whether the given fragment needs relaxation.
651 bool fragmentNeedsRelaxation(const MCRelaxableFragment *IF,
652 const MCAsmLayout &Layout) const;
654 /// \brief Perform one layout iteration and return true if any offsets
656 bool layoutOnce(MCAsmLayout &Layout);
658 /// \brief Perform one layout iteration of the given section and return true
659 /// if any offsets were adjusted.
660 bool layoutSectionOnce(MCAsmLayout &Layout, MCSection &Sec);
662 bool relaxInstruction(MCAsmLayout &Layout, MCRelaxableFragment &IF);
664 bool relaxLEB(MCAsmLayout &Layout, MCLEBFragment &IF);
666 bool relaxDwarfLineAddr(MCAsmLayout &Layout, MCDwarfLineAddrFragment &DF);
667 bool relaxDwarfCallFrameFragment(MCAsmLayout &Layout,
668 MCDwarfCallFrameFragment &DF);
670 /// finishLayout - Finalize a layout, including fragment lowering.
671 void finishLayout(MCAsmLayout &Layout);
673 std::pair<uint64_t, bool> handleFixup(const MCAsmLayout &Layout,
674 MCFragment &F, const MCFixup &Fixup);
677 /// Compute the effective fragment size assuming it is laid out at the given
678 /// \p SectionAddress and \p FragmentOffset.
679 uint64_t computeFragmentSize(const MCAsmLayout &Layout,
680 const MCFragment &F) const;
682 /// Find the symbol which defines the atom containing the given symbol, or
683 /// null if there is no such symbol.
684 const MCSymbol *getAtom(const MCSymbol &S) const;
686 /// Check whether a particular symbol is visible to the linker and is required
687 /// in the symbol table, or whether it can be discarded by the assembler. This
688 /// also effects whether the assembler treats the label as potentially
689 /// defining a separate atom.
690 bool isSymbolLinkerVisible(const MCSymbol &SD) const;
692 /// Emit the section contents using the given object writer.
693 void writeSectionData(const MCSection *Section,
694 const MCAsmLayout &Layout) const;
696 /// Check whether a given symbol has been flagged with .thumb_func.
697 bool isThumbFunc(const MCSymbol *Func) const;
699 /// Flag a function symbol as the target of a .thumb_func directive.
700 void setIsThumbFunc(const MCSymbol *Func) { ThumbFuncs.insert(Func); }
702 /// ELF e_header flags
703 unsigned getELFHeaderEFlags() const { return ELFHeaderEFlags; }
704 void setELFHeaderEFlags(unsigned Flags) { ELFHeaderEFlags = Flags; }
706 /// MachO deployment target version information.
707 const VersionMinInfoType &getVersionMinInfo() const { return VersionMinInfo; }
708 void setVersionMinInfo(MCVersionMinType Kind, unsigned Major, unsigned Minor,
710 VersionMinInfo.Kind = Kind;
711 VersionMinInfo.Major = Major;
712 VersionMinInfo.Minor = Minor;
713 VersionMinInfo.Update = Update;
717 /// Construct a new assembler instance.
719 /// \param OS The stream to output to.
721 // FIXME: How are we going to parameterize this? Two obvious options are stay
722 // concrete and require clients to pass in a target like object. The other
723 // option is to make this abstract, and have targets provide concrete
724 // implementations as we do with AsmParser.
725 MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
726 MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
730 /// Reuse an assembler instance
734 MCContext &getContext() const { return Context; }
736 MCAsmBackend &getBackend() const { return Backend; }
738 MCCodeEmitter &getEmitter() const { return Emitter; }
740 MCObjectWriter &getWriter() const { return Writer; }
742 MCDwarfLineTableParams getDWARFLinetableParams() const { return LTParams; }
743 void setDWARFLinetableParams(MCDwarfLineTableParams P) { LTParams = P; }
745 /// Finish - Do final processing and write the object to the output stream.
746 /// \p Writer is used for custom object writer (as the MCJIT does),
747 /// if not specified it is automatically created from backend.
750 // FIXME: This does not belong here.
751 bool getSubsectionsViaSymbols() const { return SubsectionsViaSymbols; }
752 void setSubsectionsViaSymbols(bool Value) { SubsectionsViaSymbols = Value; }
754 bool getRelaxAll() const { return RelaxAll; }
755 void setRelaxAll(bool Value) { RelaxAll = Value; }
757 bool isBundlingEnabled() const { return BundleAlignSize != 0; }
759 unsigned getBundleAlignSize() const { return BundleAlignSize; }
761 void setBundleAlignSize(unsigned Size) {
762 assert((Size == 0 || !(Size & (Size - 1))) &&
763 "Expect a power-of-two bundle align size");
764 BundleAlignSize = Size;
767 /// \name Section List Access
770 iterator begin() { return Sections.begin(); }
771 const_iterator begin() const { return Sections.begin(); }
773 iterator end() { return Sections.end(); }
774 const_iterator end() const { return Sections.end(); }
776 size_t size() const { return Sections.size(); }
779 /// \name Symbol List Access
781 symbol_iterator symbol_begin() { return Symbols.begin(); }
782 const_symbol_iterator symbol_begin() const { return Symbols.begin(); }
784 symbol_iterator symbol_end() { return Symbols.end(); }
785 const_symbol_iterator symbol_end() const { return Symbols.end(); }
787 symbol_range symbols() { return make_range(symbol_begin(), symbol_end()); }
788 const_symbol_range symbols() const {
789 return make_range(symbol_begin(), symbol_end());
792 size_t symbol_size() const { return Symbols.size(); }
795 /// \name Indirect Symbol List Access
798 // FIXME: This is a total hack, this should not be here. Once things are
799 // factored so that the streamer has direct access to the .o writer, it can
801 std::vector<IndirectSymbolData> &getIndirectSymbols() {
802 return IndirectSymbols;
805 indirect_symbol_iterator indirect_symbol_begin() {
806 return IndirectSymbols.begin();
808 const_indirect_symbol_iterator indirect_symbol_begin() const {
809 return IndirectSymbols.begin();
812 indirect_symbol_iterator indirect_symbol_end() {
813 return IndirectSymbols.end();
815 const_indirect_symbol_iterator indirect_symbol_end() const {
816 return IndirectSymbols.end();
819 size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
822 /// \name Linker Option List Access
825 std::vector<std::vector<std::string>> &getLinkerOptions() {
826 return LinkerOptions;
830 /// \name Data Region List Access
833 // FIXME: This is a total hack, this should not be here. Once things are
834 // factored so that the streamer has direct access to the .o writer, it can
836 std::vector<DataRegionData> &getDataRegions() { return DataRegions; }
838 data_region_iterator data_region_begin() { return DataRegions.begin(); }
839 const_data_region_iterator data_region_begin() const {
840 return DataRegions.begin();
843 data_region_iterator data_region_end() { return DataRegions.end(); }
844 const_data_region_iterator data_region_end() const {
845 return DataRegions.end();
848 size_t data_region_size() const { return DataRegions.size(); }
851 /// \name Data Region List Access
854 // FIXME: This is a total hack, this should not be here. Once things are
855 // factored so that the streamer has direct access to the .o writer, it can
857 MCLOHContainer &getLOHContainer() { return LOHContainer; }
858 const MCLOHContainer &getLOHContainer() const {
859 return const_cast<MCAssembler *>(this)->getLOHContainer();
862 /// \name Backend Data Access
865 bool registerSection(MCSection &Section) {
866 if (Section.isRegistered())
868 Sections.push_back(&Section);
869 Section.setIsRegistered(true);
873 void registerSymbol(const MCSymbol &Symbol, bool *Created = nullptr);
875 ArrayRef<std::string> getFileNames() { return FileNames; }
877 void addFileName(StringRef FileName) {
878 if (std::find(FileNames.begin(), FileNames.end(), FileName) ==
880 FileNames.push_back(FileName);
883 /// \brief Write the necessary bundle padding to the given object writer.
884 /// Expects a fragment \p F containing instructions and its size \p FSize.
885 void writeFragmentPadding(const MCFragment &F, uint64_t FSize,
886 MCObjectWriter *OW) const;
893 /// \brief Compute the amount of padding required before the fragment \p F to
894 /// obey bundling restrictions, where \p FOffset is the fragment's offset in
895 /// its section and \p FSize is the fragment's size.
896 uint64_t computeBundlePadding(const MCAssembler &Assembler, const MCFragment *F,
897 uint64_t FOffset, uint64_t FSize);
899 } // end namespace llvm