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/SmallPtrSet.h"
14 #include "llvm/ADT/ilist.h"
15 #include "llvm/ADT/ilist_node.h"
16 #include "llvm/ADT/iterator.h"
17 #include "llvm/MC/MCDirectives.h"
18 #include "llvm/MC/MCDwarf.h"
19 #include "llvm/MC/MCFixup.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/MC/MCLinkerOptimizationHint.h"
22 #include "llvm/MC/MCSubtargetInfo.h"
34 class MCSubtargetInfo;
38 class MCFragment : public ilist_node_with_parent<MCFragment, MCSection> {
39 friend class MCAsmLayout;
41 MCFragment(const MCFragment &) = delete;
42 void operator=(const MCFragment &) = delete;
45 enum FragmentType : uint8_t {
48 FT_CompactEncodedInst,
66 /// \brief Should this fragment be aligned to the end of a bundle?
67 bool AlignToBundleEnd;
69 uint8_t BundlePadding;
71 /// LayoutOrder - The layout order of this fragment.
74 /// The data for the section this fragment is in.
77 /// Atom - The atom this fragment is in, as represented by it's defining
81 /// \name Assembler Backend Data
84 // FIXME: This could all be kept private to the assembler implementation.
86 /// Offset - The offset of this fragment in its section. This is ~0 until
93 MCFragment(FragmentType Kind, bool HasInstructions,
94 uint8_t BundlePadding, MCSection *Parent = nullptr);
99 // This is a friend so that the sentinal can be created.
100 friend struct ilist_sentinel_traits<MCFragment>;
104 /// Destroys the current fragment.
106 /// This must be used instead of delete as MCFragment is non-virtual.
107 /// This method will dispatch to the appropriate subclass.
110 FragmentType getKind() const { return Kind; }
112 MCSection *getParent() const { return Parent; }
113 void setParent(MCSection *Value) { Parent = Value; }
115 const MCSymbol *getAtom() const { return Atom; }
116 void setAtom(const MCSymbol *Value) { Atom = Value; }
118 unsigned getLayoutOrder() const { return LayoutOrder; }
119 void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
121 /// \brief Does this fragment have instructions emitted into it? By default
122 /// this is false, but specific fragment types may set it to true.
123 bool hasInstructions() const { return HasInstructions; }
125 /// \brief Should this fragment be placed at the end of an aligned bundle?
126 bool alignToBundleEnd() const { return AlignToBundleEnd; }
127 void setAlignToBundleEnd(bool V) { AlignToBundleEnd = V; }
129 /// \brief Get the padding size that must be inserted before this fragment.
130 /// Used for bundling. By default, no padding is inserted.
131 /// Note that padding size is restricted to 8 bits. This is an optimization
132 /// to reduce the amount of space used for each fragment. In practice, larger
133 /// padding should never be required.
134 uint8_t getBundlePadding() const { return BundlePadding; }
136 /// \brief Set the padding size for this fragment. By default it's a no-op,
137 /// and only some fragments have a meaningful implementation.
138 void setBundlePadding(uint8_t N) { BundlePadding = N; }
140 /// \brief Return true if given frgment has FT_Dummy type.
141 bool isDummy() const { return Kind == FT_Dummy; }
146 class MCDummyFragment : public MCFragment {
148 explicit MCDummyFragment(MCSection *Sec)
149 : MCFragment(FT_Dummy, false, 0, Sec){};
150 static bool classof(const MCFragment *F) { return F->getKind() == FT_Dummy; }
153 /// Interface implemented by fragments that contain encoded instructions and/or
156 class MCEncodedFragment : public MCFragment {
158 MCEncodedFragment(MCFragment::FragmentType FType, bool HasInstructions,
160 : MCFragment(FType, HasInstructions, 0, Sec) {}
163 static bool classof(const MCFragment *F) {
164 MCFragment::FragmentType Kind = F->getKind();
168 case MCFragment::FT_Relaxable:
169 case MCFragment::FT_CompactEncodedInst:
170 case MCFragment::FT_Data:
176 /// Interface implemented by fragments that contain encoded instructions and/or
179 template<unsigned ContentsSize>
180 class MCEncodedFragmentWithContents : public MCEncodedFragment {
181 SmallVector<char, ContentsSize> Contents;
184 MCEncodedFragmentWithContents(MCFragment::FragmentType FType,
185 bool HasInstructions,
187 : MCEncodedFragment(FType, HasInstructions, Sec) {}
190 SmallVectorImpl<char> &getContents() { return Contents; }
191 const SmallVectorImpl<char> &getContents() const { return Contents; }
194 /// Interface implemented by fragments that contain encoded instructions and/or
195 /// data and also have fixups registered.
197 template<unsigned ContentsSize, unsigned FixupsSize>
198 class MCEncodedFragmentWithFixups :
199 public MCEncodedFragmentWithContents<ContentsSize> {
201 /// Fixups - The list of fixups in this fragment.
202 SmallVector<MCFixup, FixupsSize> Fixups;
205 MCEncodedFragmentWithFixups(MCFragment::FragmentType FType,
206 bool HasInstructions,
208 : MCEncodedFragmentWithContents<ContentsSize>(FType, HasInstructions,
212 typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
213 typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
215 SmallVectorImpl<MCFixup> &getFixups() { return Fixups; }
216 const SmallVectorImpl<MCFixup> &getFixups() const { return Fixups; }
218 fixup_iterator fixup_begin() { return Fixups.begin(); }
219 const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
221 fixup_iterator fixup_end() { return Fixups.end(); }
222 const_fixup_iterator fixup_end() const { return Fixups.end(); }
224 static bool classof(const MCFragment *F) {
225 MCFragment::FragmentType Kind = F->getKind();
226 return Kind == MCFragment::FT_Relaxable || Kind == MCFragment::FT_Data;
230 /// Fragment for data and encoded instructions.
232 class MCDataFragment : public MCEncodedFragmentWithFixups<32, 4> {
234 MCDataFragment(MCSection *Sec = nullptr)
235 : MCEncodedFragmentWithFixups<32, 4>(FT_Data, false, Sec) {}
237 void setHasInstructions(bool V) { HasInstructions = V; }
239 static bool classof(const MCFragment *F) {
240 return F->getKind() == MCFragment::FT_Data;
244 /// This is a compact (memory-size-wise) fragment for holding an encoded
245 /// instruction (non-relaxable) that has no fixups registered. When applicable,
246 /// it can be used instead of MCDataFragment and lead to lower memory
249 class MCCompactEncodedInstFragment : public MCEncodedFragmentWithContents<4> {
251 MCCompactEncodedInstFragment(MCSection *Sec = nullptr)
252 : MCEncodedFragmentWithContents(FT_CompactEncodedInst, true, Sec) {
255 static bool classof(const MCFragment *F) {
256 return F->getKind() == MCFragment::FT_CompactEncodedInst;
260 /// A relaxable fragment holds on to its MCInst, since it may need to be
261 /// relaxed during the assembler layout and relaxation stage.
263 class MCRelaxableFragment : public MCEncodedFragmentWithFixups<8, 1> {
265 /// Inst - The instruction this is a fragment for.
268 /// STI - The MCSubtargetInfo in effect when the instruction was encoded.
269 const MCSubtargetInfo &STI;
272 MCRelaxableFragment(const MCInst &Inst, const MCSubtargetInfo &STI,
273 MCSection *Sec = nullptr)
274 : MCEncodedFragmentWithFixups(FT_Relaxable, true, Sec),
275 Inst(Inst), STI(STI) {}
277 const MCInst &getInst() const { return Inst; }
278 void setInst(const MCInst &Value) { Inst = Value; }
280 const MCSubtargetInfo &getSubtargetInfo() { return STI; }
282 static bool classof(const MCFragment *F) {
283 return F->getKind() == MCFragment::FT_Relaxable;
287 class MCAlignFragment : public MCFragment {
289 /// Alignment - The alignment to ensure, in bytes.
292 /// EmitNops - Flag to indicate that (optimal) NOPs should be emitted instead
293 /// of using the provided value. The exact interpretation of this flag is
294 /// target dependent.
297 /// Value - Value to use for filling padding bytes.
300 /// ValueSize - The size of the integer (in bytes) of \p Value.
303 /// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment
304 /// cannot be satisfied in this width then this fragment is ignored.
305 unsigned MaxBytesToEmit;
308 MCAlignFragment(unsigned Alignment, int64_t Value, unsigned ValueSize,
309 unsigned MaxBytesToEmit, MCSection *Sec = nullptr)
310 : MCFragment(FT_Align, false, 0, Sec), Alignment(Alignment),
311 EmitNops(false), Value(Value),
312 ValueSize(ValueSize), MaxBytesToEmit(MaxBytesToEmit) {}
317 unsigned getAlignment() const { return Alignment; }
319 int64_t getValue() const { return Value; }
321 unsigned getValueSize() const { return ValueSize; }
323 unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; }
325 bool hasEmitNops() const { return EmitNops; }
326 void setEmitNops(bool Value) { EmitNops = Value; }
330 static bool classof(const MCFragment *F) {
331 return F->getKind() == MCFragment::FT_Align;
335 class MCFillFragment : public MCFragment {
337 /// Value - Value to use for filling bytes.
340 /// ValueSize - The size (in bytes) of \p Value to use when filling, or 0 if
341 /// this is a virtual fill fragment.
344 /// Size - The number of bytes to insert.
348 MCFillFragment(int64_t Value, unsigned ValueSize, uint64_t Size,
349 MCSection *Sec = nullptr)
350 : MCFragment(FT_Fill, false, 0, Sec), Value(Value), ValueSize(ValueSize),
352 assert((!ValueSize || (Size % ValueSize) == 0) &&
353 "Fill size must be a multiple of the value size!");
359 int64_t getValue() const { return Value; }
361 unsigned getValueSize() const { return ValueSize; }
363 uint64_t getSize() const { return Size; }
367 static bool classof(const MCFragment *F) {
368 return F->getKind() == MCFragment::FT_Fill;
372 class MCOrgFragment : public MCFragment {
374 /// Offset - The offset this fragment should start at.
375 const MCExpr *Offset;
377 /// Value - Value to use for filling bytes.
381 MCOrgFragment(const MCExpr &Offset, int8_t Value, MCSection *Sec = nullptr)
382 : MCFragment(FT_Org, false, 0, Sec), Offset(&Offset), Value(Value) {}
387 const MCExpr &getOffset() const { return *Offset; }
389 uint8_t getValue() const { return Value; }
393 static bool classof(const MCFragment *F) {
394 return F->getKind() == MCFragment::FT_Org;
398 class MCLEBFragment : public MCFragment {
400 /// Value - The value this fragment should contain.
403 /// IsSigned - True if this is a sleb128, false if uleb128.
406 SmallString<8> Contents;
409 MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSection *Sec = nullptr)
410 : MCFragment(FT_LEB, false, 0, Sec), Value(&Value_), IsSigned(IsSigned_) {
411 Contents.push_back(0);
417 const MCExpr &getValue() const { return *Value; }
419 bool isSigned() const { return IsSigned; }
421 SmallString<8> &getContents() { return Contents; }
422 const SmallString<8> &getContents() const { return Contents; }
426 static bool classof(const MCFragment *F) {
427 return F->getKind() == MCFragment::FT_LEB;
431 class MCDwarfLineAddrFragment : public MCFragment {
433 /// LineDelta - the value of the difference between the two line numbers
434 /// between two .loc dwarf directives.
437 /// AddrDelta - The expression for the difference of the two symbols that
438 /// make up the address delta between two .loc dwarf directives.
439 const MCExpr *AddrDelta;
441 SmallString<8> Contents;
444 MCDwarfLineAddrFragment(int64_t LineDelta, const MCExpr &AddrDelta,
445 MCSection *Sec = nullptr)
446 : MCFragment(FT_Dwarf, false, 0, Sec), LineDelta(LineDelta),
447 AddrDelta(&AddrDelta) {
448 Contents.push_back(0);
454 int64_t getLineDelta() const { return LineDelta; }
456 const MCExpr &getAddrDelta() const { return *AddrDelta; }
458 SmallString<8> &getContents() { return Contents; }
459 const SmallString<8> &getContents() const { return Contents; }
463 static bool classof(const MCFragment *F) {
464 return F->getKind() == MCFragment::FT_Dwarf;
468 class MCDwarfCallFrameFragment : public MCFragment {
470 /// AddrDelta - The expression for the difference of the two symbols that
471 /// make up the address delta between two .cfi_* dwarf directives.
472 const MCExpr *AddrDelta;
474 SmallString<8> Contents;
477 MCDwarfCallFrameFragment(const MCExpr &AddrDelta, MCSection *Sec = nullptr)
478 : MCFragment(FT_DwarfFrame, false, 0, Sec), AddrDelta(&AddrDelta) {
479 Contents.push_back(0);
485 const MCExpr &getAddrDelta() const { return *AddrDelta; }
487 SmallString<8> &getContents() { return Contents; }
488 const SmallString<8> &getContents() const { return Contents; }
492 static bool classof(const MCFragment *F) {
493 return F->getKind() == MCFragment::FT_DwarfFrame;
497 class MCSafeSEHFragment : public MCFragment {
501 MCSafeSEHFragment(const MCSymbol *Sym, MCSection *Sec = nullptr)
502 : MCFragment(FT_SafeSEH, false, 0, Sec), Sym(Sym) {}
507 const MCSymbol *getSymbol() { return Sym; }
508 const MCSymbol *getSymbol() const { return Sym; }
512 static bool classof(const MCFragment *F) {
513 return F->getKind() == MCFragment::FT_SafeSEH;
517 // FIXME: This really doesn't belong here. See comments below.
518 struct IndirectSymbolData {
523 // FIXME: Ditto this. Purely so the Streamer and the ObjectWriter can talk
525 struct DataRegionData {
526 // This enum should be kept in sync w/ the mach-o definition in
527 // llvm/Object/MachOFormat.h.
528 enum KindTy { Data = 1, JumpTable8, JumpTable16, JumpTable32 } Kind;
534 friend class MCAsmLayout;
537 typedef std::vector<MCSection *> SectionListType;
538 typedef std::vector<const MCSymbol *> SymbolDataListType;
540 typedef pointee_iterator<SectionListType::const_iterator> const_iterator;
541 typedef pointee_iterator<SectionListType::iterator> iterator;
543 typedef pointee_iterator<SymbolDataListType::const_iterator>
544 const_symbol_iterator;
545 typedef pointee_iterator<SymbolDataListType::iterator> symbol_iterator;
547 typedef iterator_range<symbol_iterator> symbol_range;
548 typedef iterator_range<const_symbol_iterator> const_symbol_range;
550 typedef std::vector<IndirectSymbolData>::const_iterator
551 const_indirect_symbol_iterator;
552 typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator;
554 typedef std::vector<DataRegionData>::const_iterator
555 const_data_region_iterator;
556 typedef std::vector<DataRegionData>::iterator data_region_iterator;
558 /// MachO specific deployment target version info.
559 // A Major version of 0 indicates that no version information was supplied
560 // and so the corresponding load command should not be emitted.
562 MCVersionMinType Kind;
566 } VersionMinInfoType;
569 MCAssembler(const MCAssembler &) = delete;
570 void operator=(const MCAssembler &) = delete;
574 MCAsmBackend &Backend;
576 MCCodeEmitter &Emitter;
578 MCObjectWriter &Writer;
580 SectionListType Sections;
582 SymbolDataListType Symbols;
584 std::vector<IndirectSymbolData> IndirectSymbols;
586 std::vector<DataRegionData> DataRegions;
588 /// The list of linker options to propagate into the object file.
589 std::vector<std::vector<std::string>> LinkerOptions;
591 /// List of declared file names
592 std::vector<std::string> FileNames;
594 MCDwarfLineTableParams LTParams;
596 /// The set of function symbols for which a .thumb_func directive has
599 // FIXME: We really would like this in target specific code rather than
600 // here. Maybe when the relocation stuff moves to target specific,
601 // this can go with it? The streamer would need some target specific
603 mutable SmallPtrSet<const MCSymbol *, 64> ThumbFuncs;
605 /// \brief The bundle alignment size currently set in the assembler.
607 /// By default it's 0, which means bundling is disabled.
608 unsigned BundleAlignSize;
610 unsigned RelaxAll : 1;
611 unsigned SubsectionsViaSymbols : 1;
612 unsigned IncrementalLinkerCompatible : 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 // FIXME: How are we going to parameterize this? Two obvious options are stay
720 // concrete and require clients to pass in a target like object. The other
721 // option is to make this abstract, and have targets provide concrete
722 // implementations as we do with AsmParser.
723 MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
724 MCCodeEmitter &Emitter_, MCObjectWriter &Writer_);
727 /// Reuse an assembler instance
731 MCContext &getContext() const { return Context; }
733 MCAsmBackend &getBackend() const { return Backend; }
735 MCCodeEmitter &getEmitter() const { return Emitter; }
737 MCObjectWriter &getWriter() const { return Writer; }
739 MCDwarfLineTableParams getDWARFLinetableParams() const { return LTParams; }
740 void setDWARFLinetableParams(MCDwarfLineTableParams P) { LTParams = P; }
742 /// Finish - Do final processing and write the object to the output stream.
743 /// \p Writer is used for custom object writer (as the MCJIT does),
744 /// if not specified it is automatically created from backend.
747 // Layout all section and prepare them for emission.
748 void layout(MCAsmLayout &Layout);
750 // FIXME: This does not belong here.
751 bool getSubsectionsViaSymbols() const { return SubsectionsViaSymbols; }
752 void setSubsectionsViaSymbols(bool Value) { SubsectionsViaSymbols = Value; }
754 bool isIncrementalLinkerCompatible() const {
755 return IncrementalLinkerCompatible;
757 void setIncrementalLinkerCompatible(bool Value) {
758 IncrementalLinkerCompatible = Value;
761 bool getRelaxAll() const { return RelaxAll; }
762 void setRelaxAll(bool Value) { RelaxAll = Value; }
764 bool isBundlingEnabled() const { return BundleAlignSize != 0; }
766 unsigned getBundleAlignSize() const { return BundleAlignSize; }
768 void setBundleAlignSize(unsigned Size) {
769 assert((Size == 0 || !(Size & (Size - 1))) &&
770 "Expect a power-of-two bundle align size");
771 BundleAlignSize = Size;
774 /// \name Section List Access
777 iterator begin() { return Sections.begin(); }
778 const_iterator begin() const { return Sections.begin(); }
780 iterator end() { return Sections.end(); }
781 const_iterator end() const { return Sections.end(); }
783 size_t size() const { return Sections.size(); }
786 /// \name Symbol List Access
788 symbol_iterator symbol_begin() { return Symbols.begin(); }
789 const_symbol_iterator symbol_begin() const { return Symbols.begin(); }
791 symbol_iterator symbol_end() { return Symbols.end(); }
792 const_symbol_iterator symbol_end() const { return Symbols.end(); }
794 symbol_range symbols() { return make_range(symbol_begin(), symbol_end()); }
795 const_symbol_range symbols() const {
796 return make_range(symbol_begin(), symbol_end());
799 size_t symbol_size() const { return Symbols.size(); }
802 /// \name Indirect Symbol List Access
805 // FIXME: This is a total hack, this should not be here. Once things are
806 // factored so that the streamer has direct access to the .o writer, it can
808 std::vector<IndirectSymbolData> &getIndirectSymbols() {
809 return IndirectSymbols;
812 indirect_symbol_iterator indirect_symbol_begin() {
813 return IndirectSymbols.begin();
815 const_indirect_symbol_iterator indirect_symbol_begin() const {
816 return IndirectSymbols.begin();
819 indirect_symbol_iterator indirect_symbol_end() {
820 return IndirectSymbols.end();
822 const_indirect_symbol_iterator indirect_symbol_end() const {
823 return IndirectSymbols.end();
826 size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
829 /// \name Linker Option List Access
832 std::vector<std::vector<std::string>> &getLinkerOptions() {
833 return LinkerOptions;
837 /// \name Data Region List Access
840 // FIXME: This is a total hack, this should not be here. Once things are
841 // factored so that the streamer has direct access to the .o writer, it can
843 std::vector<DataRegionData> &getDataRegions() { return DataRegions; }
845 data_region_iterator data_region_begin() { return DataRegions.begin(); }
846 const_data_region_iterator data_region_begin() const {
847 return DataRegions.begin();
850 data_region_iterator data_region_end() { return DataRegions.end(); }
851 const_data_region_iterator data_region_end() const {
852 return DataRegions.end();
855 size_t data_region_size() const { return DataRegions.size(); }
858 /// \name Data Region List Access
861 // FIXME: This is a total hack, this should not be here. Once things are
862 // factored so that the streamer has direct access to the .o writer, it can
864 MCLOHContainer &getLOHContainer() { return LOHContainer; }
865 const MCLOHContainer &getLOHContainer() const {
866 return const_cast<MCAssembler *>(this)->getLOHContainer();
869 /// \name Backend Data Access
872 bool registerSection(MCSection &Section);
874 void registerSymbol(const MCSymbol &Symbol, bool *Created = nullptr);
876 ArrayRef<std::string> getFileNames() { return FileNames; }
878 void addFileName(StringRef FileName) {
879 if (std::find(FileNames.begin(), FileNames.end(), FileName) ==
881 FileNames.push_back(FileName);
884 /// \brief Write the necessary bundle padding to the given object writer.
885 /// Expects a fragment \p F containing instructions and its size \p FSize.
886 void writeFragmentPadding(const MCFragment &F, uint64_t FSize,
887 MCObjectWriter *OW) const;
894 /// \brief Compute the amount of padding required before the fragment \p F to
895 /// obey bundling restrictions, where \p FOffset is the fragment's offset in
896 /// its section and \p FSize is the fragment's size.
897 uint64_t computeBundlePadding(const MCAssembler &Assembler, const MCFragment *F,
898 uint64_t FOffset, uint64_t FSize);
900 } // end namespace llvm