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/SmallString.h"
15 #include "llvm/ADT/ilist.h"
16 #include "llvm/ADT/ilist_node.h"
17 #include "llvm/Support/Casting.h"
18 #include "llvm/MC/MCFixup.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/Support/DataTypes.h"
21 #include <vector> // FIXME: Shouldn't be needed.
38 class TargetAsmBackend;
40 class MCFragment : public ilist_node<MCFragment> {
41 friend class MCAsmLayout;
43 MCFragment(const MCFragment&); // DO NOT IMPLEMENT
44 void operator=(const MCFragment&); // DO NOT IMPLEMENT
60 /// Parent - The data for the section this fragment is in.
61 MCSectionData *Parent;
63 /// Atom - The atom this fragment is in, as represented by it's defining
64 /// symbol. Atom's are only used by backends which set
65 /// \see MCAsmBackend::hasReliableSymbolDifference().
68 /// @name Assembler Backend Data
71 // FIXME: This could all be kept private to the assembler implementation.
73 /// Offset - The offset of this fragment in its section. This is ~0 until
77 /// EffectiveSize - The compute size of this section. This is ~0 until
79 uint64_t EffectiveSize;
81 /// LayoutOrder - The global layout order of this fragment. This is the index
82 /// across all fragments in the file, not just within the section.
88 MCFragment(FragmentType _Kind, MCSectionData *_Parent = 0);
93 virtual ~MCFragment();
95 FragmentType getKind() const { return Kind; }
97 MCSectionData *getParent() const { return Parent; }
98 void setParent(MCSectionData *Value) { Parent = Value; }
100 MCSymbolData *getAtom() const { return Atom; }
101 void setAtom(MCSymbolData *Value) { Atom = Value; }
103 unsigned getLayoutOrder() const { return LayoutOrder; }
104 void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
106 static bool classof(const MCFragment *O) { return true; }
111 class MCDataFragment : public MCFragment {
112 SmallString<32> Contents;
114 /// Fixups - The list of fixups in this fragment.
115 std::vector<MCFixup> Fixups;
118 typedef std::vector<MCFixup>::const_iterator const_fixup_iterator;
119 typedef std::vector<MCFixup>::iterator fixup_iterator;
122 MCDataFragment(MCSectionData *SD = 0) : MCFragment(FT_Data, SD) {}
127 SmallString<32> &getContents() { return Contents; }
128 const SmallString<32> &getContents() const { return Contents; }
131 /// @name Fixup Access
134 void addFixup(MCFixup Fixup) {
135 // Enforce invariant that fixups are in offset order.
136 assert((Fixups.empty() || Fixup.getOffset() > Fixups.back().getOffset()) &&
137 "Fixups must be added in order!");
138 Fixups.push_back(Fixup);
141 std::vector<MCFixup> &getFixups() { return Fixups; }
142 const std::vector<MCFixup> &getFixups() const { return Fixups; }
144 fixup_iterator fixup_begin() { return Fixups.begin(); }
145 const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
147 fixup_iterator fixup_end() {return Fixups.end();}
148 const_fixup_iterator fixup_end() const {return Fixups.end();}
150 size_t fixup_size() const { return Fixups.size(); }
154 static bool classof(const MCFragment *F) {
155 return F->getKind() == MCFragment::FT_Data;
157 static bool classof(const MCDataFragment *) { return true; }
160 // FIXME: This current incarnation of MCInstFragment doesn't make much sense, as
161 // it is almost entirely a duplicate of MCDataFragment. If we decide to stick
162 // with this approach (as opposed to making MCInstFragment a very light weight
163 // object with just the MCInst and a code size, then we should just change
164 // MCDataFragment to have an optional MCInst at its end.
165 class MCInstFragment : public MCFragment {
166 /// Inst - The instruction this is a fragment for.
169 /// Code - Binary data for the currently encoded instruction.
172 /// Fixups - The list of fixups in this fragment.
173 SmallVector<MCFixup, 1> Fixups;
176 typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
177 typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
180 MCInstFragment(MCInst _Inst, MCSectionData *SD = 0)
181 : MCFragment(FT_Inst, SD), Inst(_Inst) {
187 SmallVectorImpl<char> &getCode() { return Code; }
188 const SmallVectorImpl<char> &getCode() const { return Code; }
190 unsigned getInstSize() const { return Code.size(); }
192 MCInst &getInst() { return Inst; }
193 const MCInst &getInst() const { return Inst; }
195 void setInst(MCInst Value) { Inst = Value; }
198 /// @name Fixup Access
201 SmallVectorImpl<MCFixup> &getFixups() { return Fixups; }
202 const SmallVectorImpl<MCFixup> &getFixups() const { return Fixups; }
204 fixup_iterator fixup_begin() { return Fixups.begin(); }
205 const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
207 fixup_iterator fixup_end() {return Fixups.end();}
208 const_fixup_iterator fixup_end() const {return Fixups.end();}
210 size_t fixup_size() const { return Fixups.size(); }
214 static bool classof(const MCFragment *F) {
215 return F->getKind() == MCFragment::FT_Inst;
217 static bool classof(const MCInstFragment *) { return true; }
220 class MCAlignFragment : public MCFragment {
221 /// Alignment - The alignment to ensure, in bytes.
224 /// Value - Value to use for filling padding bytes.
227 /// ValueSize - The size of the integer (in bytes) of \arg Value.
230 /// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment
231 /// cannot be satisfied in this width then this fragment is ignored.
232 unsigned MaxBytesToEmit;
234 /// EmitNops - Flag to indicate that (optimal) NOPs should be emitted instead
235 /// of using the provided value. The exact interpretation of this flag is
236 /// target dependent.
240 MCAlignFragment(unsigned _Alignment, int64_t _Value, unsigned _ValueSize,
241 unsigned _MaxBytesToEmit, MCSectionData *SD = 0)
242 : MCFragment(FT_Align, SD), Alignment(_Alignment),
243 Value(_Value),ValueSize(_ValueSize),
244 MaxBytesToEmit(_MaxBytesToEmit), EmitNops(false) {}
249 unsigned getAlignment() const { return Alignment; }
251 int64_t getValue() const { return Value; }
253 unsigned getValueSize() const { return ValueSize; }
255 unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; }
257 bool hasEmitNops() const { return EmitNops; }
258 void setEmitNops(bool Value) { EmitNops = Value; }
262 static bool classof(const MCFragment *F) {
263 return F->getKind() == MCFragment::FT_Align;
265 static bool classof(const MCAlignFragment *) { return true; }
268 class MCFillFragment : public MCFragment {
269 /// Value - Value to use for filling bytes.
272 /// ValueSize - The size (in bytes) of \arg Value to use when filling, or 0 if
273 /// this is a virtual fill fragment.
276 /// Size - The number of bytes to insert.
280 MCFillFragment(int64_t _Value, unsigned _ValueSize, uint64_t _Size,
281 MCSectionData *SD = 0)
282 : MCFragment(FT_Fill, SD),
283 Value(_Value), ValueSize(_ValueSize), Size(_Size) {
284 assert((!ValueSize || (Size % ValueSize) == 0) &&
285 "Fill size must be a multiple of the value size!");
291 int64_t getValue() const { return Value; }
293 unsigned getValueSize() const { return ValueSize; }
295 uint64_t getSize() const { return Size; }
299 static bool classof(const MCFragment *F) {
300 return F->getKind() == MCFragment::FT_Fill;
302 static bool classof(const MCFillFragment *) { return true; }
305 class MCOrgFragment : public MCFragment {
306 /// Offset - The offset this fragment should start at.
307 const MCExpr *Offset;
309 /// Value - Value to use for filling bytes.
312 /// Size - The current estimate of the size.
316 MCOrgFragment(const MCExpr &_Offset, int8_t _Value, MCSectionData *SD = 0)
317 : MCFragment(FT_Org, SD),
318 Offset(&_Offset), Value(_Value), Size(0) {}
323 const MCExpr &getOffset() const { return *Offset; }
325 uint8_t getValue() const { return Value; }
327 unsigned getSize() const { return Size; }
329 void setSize(unsigned Size_) { Size = Size_; }
332 static bool classof(const MCFragment *F) {
333 return F->getKind() == MCFragment::FT_Org;
335 static bool classof(const MCOrgFragment *) { return true; }
338 class MCLEBFragment : public MCFragment {
339 /// Value - The value this fragment should contain.
342 /// IsSigned - True if this is a sleb128, false if uleb128.
345 SmallString<8> Contents;
347 MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSectionData *SD)
348 : MCFragment(FT_LEB, SD),
349 Value(&Value_), IsSigned(IsSigned_) { Contents.push_back(0); }
354 const MCExpr &getValue() const { return *Value; }
356 bool isSigned() const { return IsSigned; }
358 SmallString<8> &getContents() { return Contents; }
359 const SmallString<8> &getContents() const { return Contents; }
363 static bool classof(const MCFragment *F) {
364 return F->getKind() == MCFragment::FT_LEB;
366 static bool classof(const MCLEBFragment *) { return true; }
369 class MCDwarfLineAddrFragment : public MCFragment {
370 /// LineDelta - the value of the difference between the two line numbers
371 /// between two .loc dwarf directives.
374 /// AddrDelta - The expression for the difference of the two symbols that
375 /// make up the address delta between two .loc dwarf directives.
376 const MCExpr *AddrDelta;
378 SmallString<8> Contents;
381 MCDwarfLineAddrFragment(int64_t _LineDelta, const MCExpr &_AddrDelta,
382 MCSectionData *SD = 0)
383 : MCFragment(FT_Dwarf, SD),
384 LineDelta(_LineDelta), AddrDelta(&_AddrDelta) { Contents.push_back(0); }
389 int64_t getLineDelta() const { return LineDelta; }
391 const MCExpr &getAddrDelta() const { return *AddrDelta; }
393 SmallString<8> &getContents() { return Contents; }
394 const SmallString<8> &getContents() const { return Contents; }
398 static bool classof(const MCFragment *F) {
399 return F->getKind() == MCFragment::FT_Dwarf;
401 static bool classof(const MCDwarfLineAddrFragment *) { return true; }
404 // FIXME: Should this be a separate class, or just merged into MCSection? Since
405 // we anticipate the fast path being through an MCAssembler, the only reason to
406 // keep it out is for API abstraction.
407 class MCSectionData : public ilist_node<MCSectionData> {
408 friend class MCAsmLayout;
410 MCSectionData(const MCSectionData&); // DO NOT IMPLEMENT
411 void operator=(const MCSectionData&); // DO NOT IMPLEMENT
414 typedef iplist<MCFragment> FragmentListType;
416 typedef FragmentListType::const_iterator const_iterator;
417 typedef FragmentListType::iterator iterator;
419 typedef FragmentListType::const_reverse_iterator const_reverse_iterator;
420 typedef FragmentListType::reverse_iterator reverse_iterator;
423 FragmentListType Fragments;
424 const MCSection *Section;
426 /// Ordinal - The section index in the assemblers section list.
429 /// LayoutOrder - The index of this section in the layout order.
430 unsigned LayoutOrder;
432 /// Alignment - The maximum alignment seen in this section.
435 /// @name Assembler Backend Data
438 // FIXME: This could all be kept private to the assembler implementation.
440 /// HasInstructions - Whether this section has had instructions emitted into
442 unsigned HasInstructions : 1;
447 // Only for use as sentinel.
449 MCSectionData(const MCSection &Section, MCAssembler *A = 0);
451 const MCSection &getSection() const { return *Section; }
453 unsigned getAlignment() const { return Alignment; }
454 void setAlignment(unsigned Value) { Alignment = Value; }
456 bool hasInstructions() const { return HasInstructions; }
457 void setHasInstructions(bool Value) { HasInstructions = Value; }
459 unsigned getOrdinal() const { return Ordinal; }
460 void setOrdinal(unsigned Value) { Ordinal = Value; }
462 unsigned getLayoutOrder() const { return LayoutOrder; }
463 void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
465 /// @name Fragment Access
468 const FragmentListType &getFragmentList() const { return Fragments; }
469 FragmentListType &getFragmentList() { return Fragments; }
471 iterator begin() { return Fragments.begin(); }
472 const_iterator begin() const { return Fragments.begin(); }
474 iterator end() { return Fragments.end(); }
475 const_iterator end() const { return Fragments.end(); }
477 reverse_iterator rbegin() { return Fragments.rbegin(); }
478 const_reverse_iterator rbegin() const { return Fragments.rbegin(); }
480 reverse_iterator rend() { return Fragments.rend(); }
481 const_reverse_iterator rend() const { return Fragments.rend(); }
483 size_t size() const { return Fragments.size(); }
485 bool empty() const { return Fragments.empty(); }
492 // FIXME: Same concerns as with SectionData.
493 class MCSymbolData : public ilist_node<MCSymbolData> {
495 const MCSymbol *Symbol;
497 /// Fragment - The fragment this symbol's value is relative to, if any.
498 MCFragment *Fragment;
500 /// Offset - The offset to apply to the fragment address to form this symbol's
504 /// IsExternal - True if this symbol is visible outside this translation
506 unsigned IsExternal : 1;
508 /// IsPrivateExtern - True if this symbol is private extern.
509 unsigned IsPrivateExtern : 1;
511 /// CommonSize - The size of the symbol, if it is 'common', or 0.
513 // FIXME: Pack this in with other fields? We could put it in offset, since a
514 // common symbol can never get a definition.
517 /// SymbolSize - An expression describing how to calculate the size of
518 /// a symbol. If a symbol has no size this field will be NULL.
519 const MCExpr *SymbolSize;
521 /// CommonAlign - The alignment of the symbol, if it is 'common'.
523 // FIXME: Pack this in with other fields?
524 unsigned CommonAlign;
526 /// Flags - The Flags field is used by object file implementations to store
527 /// additional per symbol information which is not easily classified.
530 /// Index - Index field, for use by the object file implementation.
534 // Only for use as sentinel.
536 MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset,
542 const MCSymbol &getSymbol() const { return *Symbol; }
544 MCFragment *getFragment() const { return Fragment; }
545 void setFragment(MCFragment *Value) { Fragment = Value; }
547 uint64_t getOffset() const { return Offset; }
548 void setOffset(uint64_t Value) { Offset = Value; }
551 /// @name Symbol Attributes
554 bool isExternal() const { return IsExternal; }
555 void setExternal(bool Value) { IsExternal = Value; }
557 bool isPrivateExtern() const { return IsPrivateExtern; }
558 void setPrivateExtern(bool Value) { IsPrivateExtern = Value; }
560 /// isCommon - Is this a 'common' symbol.
561 bool isCommon() const { return CommonSize != 0; }
563 /// setCommon - Mark this symbol as being 'common'.
565 /// \param Size - The size of the symbol.
566 /// \param Align - The alignment of the symbol.
567 void setCommon(uint64_t Size, unsigned Align) {
572 /// getCommonSize - Return the size of a 'common' symbol.
573 uint64_t getCommonSize() const {
574 assert(isCommon() && "Not a 'common' symbol!");
578 void setSize(const MCExpr *SS) {
582 const MCExpr *getSize() const {
587 /// getCommonAlignment - Return the alignment of a 'common' symbol.
588 unsigned getCommonAlignment() const {
589 assert(isCommon() && "Not a 'common' symbol!");
593 /// getFlags - Get the (implementation defined) symbol flags.
594 uint32_t getFlags() const { return Flags; }
596 /// setFlags - Set the (implementation defined) symbol flags.
597 void setFlags(uint32_t Value) { Flags = Value; }
599 /// modifyFlags - Modify the flags via a mask
600 void modifyFlags(uint32_t Value, uint32_t Mask) {
601 Flags = (Flags & ~Mask) | Value;
604 /// getIndex - Get the (implementation defined) index.
605 uint64_t getIndex() const { return Index; }
607 /// setIndex - Set the (implementation defined) index.
608 void setIndex(uint64_t Value) { Index = Value; }
615 // FIXME: This really doesn't belong here. See comments below.
616 struct IndirectSymbolData {
618 MCSectionData *SectionData;
622 friend class MCAsmLayout;
625 typedef iplist<MCSectionData> SectionDataListType;
626 typedef iplist<MCSymbolData> SymbolDataListType;
628 typedef SectionDataListType::const_iterator const_iterator;
629 typedef SectionDataListType::iterator iterator;
631 typedef SymbolDataListType::const_iterator const_symbol_iterator;
632 typedef SymbolDataListType::iterator symbol_iterator;
634 typedef std::vector<IndirectSymbolData>::const_iterator
635 const_indirect_symbol_iterator;
636 typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator;
639 MCAssembler(const MCAssembler&); // DO NOT IMPLEMENT
640 void operator=(const MCAssembler&); // DO NOT IMPLEMENT
644 TargetAsmBackend &Backend;
646 MCCodeEmitter &Emitter;
650 iplist<MCSectionData> Sections;
652 iplist<MCSymbolData> Symbols;
654 /// The map of sections to their associated assembler backend data.
656 // FIXME: Avoid this indirection?
657 DenseMap<const MCSection*, MCSectionData*> SectionMap;
659 /// The map of symbols to their associated assembler backend data.
661 // FIXME: Avoid this indirection?
662 DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap;
664 std::vector<IndirectSymbolData> IndirectSymbols;
666 unsigned RelaxAll : 1;
667 unsigned SubsectionsViaSymbols : 1;
670 /// Evaluate a fixup to a relocatable expression and the value which should be
671 /// placed into the fixup.
673 /// \param Layout The layout to use for evaluation.
674 /// \param Fixup The fixup to evaluate.
675 /// \param DF The fragment the fixup is inside.
676 /// \param Target [out] On return, the relocatable expression the fixup
678 /// \param Value [out] On return, the value of the fixup as currently layed
680 /// \return Whether the fixup value was fully resolved. This is true if the
681 /// \arg Value result is fixed, otherwise the value may change due to
683 bool EvaluateFixup(const MCObjectWriter &Writer, const MCAsmLayout &Layout,
684 const MCFixup &Fixup, const MCFragment *DF,
685 MCValue &Target, uint64_t &Value) const;
687 /// Check whether a fixup can be satisfied, or whether it needs to be relaxed
688 /// (increased in size, in order to hold its value correctly).
689 bool FixupNeedsRelaxation(const MCObjectWriter &Writer,
690 const MCFixup &Fixup, const MCFragment *DF,
691 const MCAsmLayout &Layout) const;
693 /// Check whether the given fragment needs relaxation.
694 bool FragmentNeedsRelaxation(const MCObjectWriter &Writer,
695 const MCInstFragment *IF,
696 const MCAsmLayout &Layout) const;
698 /// Compute the effective fragment size assuming it is layed out at the given
699 /// \arg SectionAddress and \arg FragmentOffset.
700 uint64_t ComputeFragmentSize(const MCFragment &F,
701 uint64_t FragmentOffset) const;
703 /// LayoutOnce - Perform one layout iteration and return true if any offsets
705 bool LayoutOnce(const MCObjectWriter &Writer, MCAsmLayout &Layout);
707 bool RelaxInstruction(const MCObjectWriter &Writer, MCAsmLayout &Layout,
710 bool RelaxOrg(const MCObjectWriter &Writer, MCAsmLayout &Layout,
713 bool RelaxLEB(const MCObjectWriter &Writer, MCAsmLayout &Layout,
716 bool RelaxDwarfLineAddr(const MCObjectWriter &Writer, MCAsmLayout &Layout,
717 MCDwarfLineAddrFragment &DF);
719 /// FinishLayout - Finalize a layout, including fragment lowering.
720 void FinishLayout(MCAsmLayout &Layout);
722 uint64_t HandleFixup(MCObjectWriter &Writer, const MCAsmLayout &Layout,
723 MCFragment &F, const MCFixup &Fixup);
726 /// Find the symbol which defines the atom containing the given symbol, or
727 /// null if there is no such symbol.
728 const MCSymbolData *getAtom(const MCSymbolData *Symbol) const;
730 /// Check whether a particular symbol is visible to the linker and is required
731 /// in the symbol table, or whether it can be discarded by the assembler. This
732 /// also effects whether the assembler treats the label as potentially
733 /// defining a separate atom.
734 bool isSymbolLinkerVisible(const MCSymbol &SD) const;
736 /// Emit the section contents using the given object writer.
738 // FIXME: Should MCAssembler always have a reference to the object writer?
739 void WriteSectionData(const MCSectionData *Section, const MCAsmLayout &Layout,
740 MCObjectWriter *OW) const;
743 /// Construct a new assembler instance.
745 /// \arg OS - The stream to output to.
747 // FIXME: How are we going to parameterize this? Two obvious options are stay
748 // concrete and require clients to pass in a target like object. The other
749 // option is to make this abstract, and have targets provide concrete
750 // implementations as we do with AsmParser.
751 MCAssembler(MCContext &_Context, TargetAsmBackend &_Backend,
752 MCCodeEmitter &_Emitter, raw_ostream &OS);
755 MCContext &getContext() const { return Context; }
757 TargetAsmBackend &getBackend() const { return Backend; }
759 MCCodeEmitter &getEmitter() const { return Emitter; }
761 /// Finish - Do final processing and write the object to the output stream.
762 /// \arg Writer is used for custom object writer (as the MCJIT does),
763 /// if not specified it is automatically created from backend.
764 void Finish(MCObjectWriter *Writer = 0);
766 // FIXME: This does not belong here.
767 bool getSubsectionsViaSymbols() const {
768 return SubsectionsViaSymbols;
770 void setSubsectionsViaSymbols(bool Value) {
771 SubsectionsViaSymbols = Value;
774 bool getRelaxAll() const { return RelaxAll; }
775 void setRelaxAll(bool Value) { RelaxAll = Value; }
777 /// @name Section List Access
780 const SectionDataListType &getSectionList() const { return Sections; }
781 SectionDataListType &getSectionList() { return Sections; }
783 iterator begin() { return Sections.begin(); }
784 const_iterator begin() const { return Sections.begin(); }
786 iterator end() { return Sections.end(); }
787 const_iterator end() const { return Sections.end(); }
789 size_t size() const { return Sections.size(); }
792 /// @name Symbol List Access
795 const SymbolDataListType &getSymbolList() const { return Symbols; }
796 SymbolDataListType &getSymbolList() { return Symbols; }
798 symbol_iterator symbol_begin() { return Symbols.begin(); }
799 const_symbol_iterator symbol_begin() const { return Symbols.begin(); }
801 symbol_iterator symbol_end() { return Symbols.end(); }
802 const_symbol_iterator symbol_end() const { return Symbols.end(); }
804 size_t symbol_size() const { return Symbols.size(); }
807 /// @name Indirect Symbol List Access
810 // FIXME: This is a total hack, this should not be here. Once things are
811 // factored so that the streamer has direct access to the .o writer, it can
813 std::vector<IndirectSymbolData> &getIndirectSymbols() {
814 return IndirectSymbols;
817 indirect_symbol_iterator indirect_symbol_begin() {
818 return IndirectSymbols.begin();
820 const_indirect_symbol_iterator indirect_symbol_begin() const {
821 return IndirectSymbols.begin();
824 indirect_symbol_iterator indirect_symbol_end() {
825 return IndirectSymbols.end();
827 const_indirect_symbol_iterator indirect_symbol_end() const {
828 return IndirectSymbols.end();
831 size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
834 /// @name Backend Data Access
837 MCSectionData &getSectionData(const MCSection &Section) const {
838 MCSectionData *Entry = SectionMap.lookup(&Section);
839 assert(Entry && "Missing section data!");
843 MCSectionData &getOrCreateSectionData(const MCSection &Section,
845 MCSectionData *&Entry = SectionMap[&Section];
847 if (Created) *Created = !Entry;
849 Entry = new MCSectionData(Section, this);
854 MCSymbolData &getSymbolData(const MCSymbol &Symbol) const {
855 MCSymbolData *Entry = SymbolMap.lookup(&Symbol);
856 assert(Entry && "Missing symbol data!");
860 MCSymbolData &getOrCreateSymbolData(const MCSymbol &Symbol,
862 MCSymbolData *&Entry = SymbolMap[&Symbol];
864 if (Created) *Created = !Entry;
866 Entry = new MCSymbolData(Symbol, 0, 0, this);
876 } // end namespace llvm