MCAssembler.h revision 2a6e3f5be21fdcb1fa81533ec81ba879df815607
1//===- MCAssembler.h - Object File Generation -------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef LLVM_MC_MCASSEMBLER_H 11#define LLVM_MC_MCASSEMBLER_H 12 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/System/DataTypes.h" 20#include <vector> // FIXME: Shouldn't be needed. 21 22namespace llvm { 23class raw_ostream; 24class MCAsmLayout; 25class MCAssembler; 26class MCContext; 27class MCCodeEmitter; 28class MCExpr; 29class MCFragment; 30class MCObjectWriter; 31class MCSection; 32class MCSectionData; 33class MCSymbol; 34class MCValue; 35class TargetAsmBackend; 36 37/// MCAsmFixup - Represent a fixed size region of bytes inside some fragment 38/// which needs to be rewritten. This region will either be rewritten by the 39/// assembler or cause a relocation entry to be generated. 40class MCAsmFixup { 41public: 42 /// Offset - The offset inside the fragment which needs to be rewritten. 43 uint64_t Offset; 44 45 /// Value - The expression to eventually write into the fragment. 46 const MCExpr *Value; 47 48 /// Kind - The fixup kind. 49 MCFixupKind Kind; 50 51public: 52 MCAsmFixup(uint64_t _Offset, const MCExpr &_Value, MCFixupKind _Kind) 53 : Offset(_Offset), Value(&_Value), Kind(_Kind) {} 54}; 55 56class MCFragment : public ilist_node<MCFragment> { 57 MCFragment(const MCFragment&); // DO NOT IMPLEMENT 58 void operator=(const MCFragment&); // DO NOT IMPLEMENT 59 60public: 61 enum FragmentType { 62 FT_Data, 63 FT_Align, 64 FT_Fill, 65 FT_Org, 66 FT_ZeroFill 67 }; 68 69private: 70 FragmentType Kind; 71 72 /// Parent - The data for the section this fragment is in. 73 MCSectionData *Parent; 74 75 /// @name Assembler Backend Data 76 /// @{ 77 // 78 // FIXME: This could all be kept private to the assembler implementation. 79 80 /// Offset - The offset of this fragment in its section. This is ~0 until 81 /// initialized. 82 uint64_t Offset; 83 84 /// FileSize - The file size of this section. This is ~0 until initialized. 85 uint64_t FileSize; 86 87 /// @} 88 89protected: 90 MCFragment(FragmentType _Kind, MCSectionData *_Parent = 0); 91 92public: 93 // Only for sentinel. 94 MCFragment(); 95 virtual ~MCFragment(); 96 97 FragmentType getKind() const { return Kind; } 98 99 MCSectionData *getParent() const { return Parent; } 100 void setParent(MCSectionData *Value) { Parent = Value; } 101 102 /// @name Assembler Backend Support 103 /// @{ 104 // 105 // FIXME: This could all be kept private to the assembler implementation. 106 107 uint64_t getAddress() const; 108 109 uint64_t getFileSize() const { 110 assert(FileSize != ~UINT64_C(0) && "File size not set!"); 111 return FileSize; 112 } 113 void setFileSize(uint64_t Value) { FileSize = Value; } 114 115 uint64_t getOffset() const { 116 assert(Offset != ~UINT64_C(0) && "File offset not set!"); 117 return Offset; 118 } 119 void setOffset(uint64_t Value) { Offset = Value; } 120 121 /// @} 122 123 static bool classof(const MCFragment *O) { return true; } 124 125 virtual void dump(); 126}; 127 128class MCDataFragment : public MCFragment { 129 SmallString<32> Contents; 130 131 /// Fixups - The list of fixups in this fragment. 132 std::vector<MCAsmFixup> Fixups; 133 134public: 135 typedef std::vector<MCAsmFixup>::const_iterator const_fixup_iterator; 136 typedef std::vector<MCAsmFixup>::iterator fixup_iterator; 137 138public: 139 MCDataFragment(MCSectionData *SD = 0) : MCFragment(FT_Data, SD) {} 140 141 /// @name Accessors 142 /// @{ 143 144 SmallString<32> &getContents() { return Contents; } 145 const SmallString<32> &getContents() const { return Contents; } 146 147 /// @} 148 149 /// @name Fixup Access 150 /// @{ 151 152 void addFixup(MCAsmFixup Fixup) { 153 // Enforce invariant that fixups are in offset order. 154 assert((Fixups.empty() || Fixup.Offset > Fixups.back().Offset) && 155 "Fixups must be added in order!"); 156 Fixups.push_back(Fixup); 157 } 158 159 std::vector<MCAsmFixup> &getFixups() { return Fixups; } 160 const std::vector<MCAsmFixup> &getFixups() const { return Fixups; } 161 162 fixup_iterator fixup_begin() { return Fixups.begin(); } 163 const_fixup_iterator fixup_begin() const { return Fixups.begin(); } 164 165 fixup_iterator fixup_end() {return Fixups.end();} 166 const_fixup_iterator fixup_end() const {return Fixups.end();} 167 168 size_t fixup_size() const { return Fixups.size(); } 169 170 /// @} 171 172 static bool classof(const MCFragment *F) { 173 return F->getKind() == MCFragment::FT_Data; 174 } 175 static bool classof(const MCDataFragment *) { return true; } 176 177 virtual void dump(); 178}; 179 180class MCAlignFragment : public MCFragment { 181 /// Alignment - The alignment to ensure, in bytes. 182 unsigned Alignment; 183 184 /// Value - Value to use for filling padding bytes. 185 int64_t Value; 186 187 /// ValueSize - The size of the integer (in bytes) of \arg Value. 188 unsigned ValueSize; 189 190 /// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment 191 /// cannot be satisfied in this width then this fragment is ignored. 192 unsigned MaxBytesToEmit; 193 194 /// EmitNops - true when aligning code and optimal nops to be used for 195 /// filling. 196 bool EmitNops; 197 198public: 199 MCAlignFragment(unsigned _Alignment, int64_t _Value, unsigned _ValueSize, 200 unsigned _MaxBytesToEmit, bool _EmitNops, 201 MCSectionData *SD = 0) 202 : MCFragment(FT_Align, SD), Alignment(_Alignment), 203 Value(_Value),ValueSize(_ValueSize), 204 MaxBytesToEmit(_MaxBytesToEmit), EmitNops(_EmitNops) {} 205 206 /// @name Accessors 207 /// @{ 208 209 unsigned getAlignment() const { return Alignment; } 210 211 int64_t getValue() const { return Value; } 212 213 unsigned getValueSize() const { return ValueSize; } 214 215 unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; } 216 217 unsigned getEmitNops() const { return EmitNops; } 218 219 /// @} 220 221 static bool classof(const MCFragment *F) { 222 return F->getKind() == MCFragment::FT_Align; 223 } 224 static bool classof(const MCAlignFragment *) { return true; } 225 226 virtual void dump(); 227}; 228 229class MCFillFragment : public MCFragment { 230 /// Value - Value to use for filling bytes. 231 int64_t Value; 232 233 /// ValueSize - The size (in bytes) of \arg Value to use when filling. 234 unsigned ValueSize; 235 236 /// Count - The number of copies of \arg Value to insert. 237 uint64_t Count; 238 239public: 240 MCFillFragment(int64_t _Value, unsigned _ValueSize, uint64_t _Count, 241 MCSectionData *SD = 0) 242 : MCFragment(FT_Fill, SD), 243 Value(_Value), ValueSize(_ValueSize), Count(_Count) {} 244 245 /// @name Accessors 246 /// @{ 247 248 int64_t getValue() const { return Value; } 249 250 unsigned getValueSize() const { return ValueSize; } 251 252 uint64_t getCount() const { return Count; } 253 254 /// @} 255 256 static bool classof(const MCFragment *F) { 257 return F->getKind() == MCFragment::FT_Fill; 258 } 259 static bool classof(const MCFillFragment *) { return true; } 260 261 virtual void dump(); 262}; 263 264class MCOrgFragment : public MCFragment { 265 /// Offset - The offset this fragment should start at. 266 const MCExpr *Offset; 267 268 /// Value - Value to use for filling bytes. 269 int8_t Value; 270 271public: 272 MCOrgFragment(const MCExpr &_Offset, int8_t _Value, MCSectionData *SD = 0) 273 : MCFragment(FT_Org, SD), 274 Offset(&_Offset), Value(_Value) {} 275 276 /// @name Accessors 277 /// @{ 278 279 const MCExpr &getOffset() const { return *Offset; } 280 281 uint8_t getValue() const { return Value; } 282 283 /// @} 284 285 static bool classof(const MCFragment *F) { 286 return F->getKind() == MCFragment::FT_Org; 287 } 288 static bool classof(const MCOrgFragment *) { return true; } 289 290 virtual void dump(); 291}; 292 293/// MCZeroFillFragment - Represent data which has a fixed size and alignment, 294/// but requires no physical space in the object file. 295class MCZeroFillFragment : public MCFragment { 296 /// Size - The size of this fragment. 297 uint64_t Size; 298 299 /// Alignment - The alignment for this fragment. 300 unsigned Alignment; 301 302public: 303 MCZeroFillFragment(uint64_t _Size, unsigned _Alignment, MCSectionData *SD = 0) 304 : MCFragment(FT_ZeroFill, SD), 305 Size(_Size), Alignment(_Alignment) {} 306 307 /// @name Accessors 308 /// @{ 309 310 uint64_t getSize() const { return Size; } 311 312 unsigned getAlignment() const { return Alignment; } 313 314 /// @} 315 316 static bool classof(const MCFragment *F) { 317 return F->getKind() == MCFragment::FT_ZeroFill; 318 } 319 static bool classof(const MCZeroFillFragment *) { return true; } 320 321 virtual void dump(); 322}; 323 324// FIXME: Should this be a separate class, or just merged into MCSection? Since 325// we anticipate the fast path being through an MCAssembler, the only reason to 326// keep it out is for API abstraction. 327class MCSectionData : public ilist_node<MCSectionData> { 328 MCSectionData(const MCSectionData&); // DO NOT IMPLEMENT 329 void operator=(const MCSectionData&); // DO NOT IMPLEMENT 330 331public: 332 typedef iplist<MCFragment> FragmentListType; 333 334 typedef FragmentListType::const_iterator const_iterator; 335 typedef FragmentListType::iterator iterator; 336 337 typedef FragmentListType::const_reverse_iterator const_reverse_iterator; 338 typedef FragmentListType::reverse_iterator reverse_iterator; 339 340private: 341 iplist<MCFragment> Fragments; 342 const MCSection *Section; 343 344 /// Alignment - The maximum alignment seen in this section. 345 unsigned Alignment; 346 347 /// @name Assembler Backend Data 348 /// @{ 349 // 350 // FIXME: This could all be kept private to the assembler implementation. 351 352 /// Address - The computed address of this section. This is ~0 until 353 /// initialized. 354 uint64_t Address; 355 356 /// Size - The content size of this section. This is ~0 until initialized. 357 uint64_t Size; 358 359 /// FileSize - The size of this section in the object file. This is ~0 until 360 /// initialized. 361 uint64_t FileSize; 362 363 /// HasInstructions - Whether this section has had instructions emitted into 364 /// it. 365 unsigned HasInstructions : 1; 366 367 /// @} 368 369public: 370 // Only for use as sentinel. 371 MCSectionData(); 372 MCSectionData(const MCSection &Section, MCAssembler *A = 0); 373 374 const MCSection &getSection() const { return *Section; } 375 376 unsigned getAlignment() const { return Alignment; } 377 void setAlignment(unsigned Value) { Alignment = Value; } 378 379 /// @name Fragment Access 380 /// @{ 381 382 const FragmentListType &getFragmentList() const { return Fragments; } 383 FragmentListType &getFragmentList() { return Fragments; } 384 385 iterator begin() { return Fragments.begin(); } 386 const_iterator begin() const { return Fragments.begin(); } 387 388 iterator end() { return Fragments.end(); } 389 const_iterator end() const { return Fragments.end(); } 390 391 reverse_iterator rbegin() { return Fragments.rbegin(); } 392 const_reverse_iterator rbegin() const { return Fragments.rbegin(); } 393 394 reverse_iterator rend() { return Fragments.rend(); } 395 const_reverse_iterator rend() const { return Fragments.rend(); } 396 397 size_t size() const { return Fragments.size(); } 398 399 bool empty() const { return Fragments.empty(); } 400 401 /// @} 402 /// @name Assembler Backend Support 403 /// @{ 404 // 405 // FIXME: This could all be kept private to the assembler implementation. 406 407 uint64_t getAddress() const { 408 assert(Address != ~UINT64_C(0) && "Address not set!"); 409 return Address; 410 } 411 void setAddress(uint64_t Value) { Address = Value; } 412 413 uint64_t getSize() const { 414 assert(Size != ~UINT64_C(0) && "File size not set!"); 415 return Size; 416 } 417 void setSize(uint64_t Value) { Size = Value; } 418 419 uint64_t getFileSize() const { 420 assert(FileSize != ~UINT64_C(0) && "File size not set!"); 421 return FileSize; 422 } 423 void setFileSize(uint64_t Value) { FileSize = Value; } 424 425 bool hasInstructions() const { return HasInstructions; } 426 void setHasInstructions(bool Value) { HasInstructions = Value; } 427 428 /// @} 429 430 void dump(); 431}; 432 433// FIXME: Same concerns as with SectionData. 434class MCSymbolData : public ilist_node<MCSymbolData> { 435public: 436 const MCSymbol *Symbol; 437 438 /// Fragment - The fragment this symbol's value is relative to, if any. 439 MCFragment *Fragment; 440 441 /// Offset - The offset to apply to the fragment address to form this symbol's 442 /// value. 443 uint64_t Offset; 444 445 /// IsExternal - True if this symbol is visible outside this translation 446 /// unit. 447 unsigned IsExternal : 1; 448 449 /// IsPrivateExtern - True if this symbol is private extern. 450 unsigned IsPrivateExtern : 1; 451 452 /// CommonSize - The size of the symbol, if it is 'common', or 0. 453 // 454 // FIXME: Pack this in with other fields? We could put it in offset, since a 455 // common symbol can never get a definition. 456 uint64_t CommonSize; 457 458 /// CommonAlign - The alignment of the symbol, if it is 'common'. 459 // 460 // FIXME: Pack this in with other fields? 461 unsigned CommonAlign; 462 463 /// Flags - The Flags field is used by object file implementations to store 464 /// additional per symbol information which is not easily classified. 465 uint32_t Flags; 466 467 /// Index - Index field, for use by the object file implementation. 468 uint64_t Index; 469 470public: 471 // Only for use as sentinel. 472 MCSymbolData(); 473 MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset, 474 MCAssembler *A = 0); 475 476 /// @name Accessors 477 /// @{ 478 479 const MCSymbol &getSymbol() const { return *Symbol; } 480 481 MCFragment *getFragment() const { return Fragment; } 482 void setFragment(MCFragment *Value) { Fragment = Value; } 483 484 uint64_t getOffset() const { return Offset; } 485 void setOffset(uint64_t Value) { Offset = Value; } 486 487 uint64_t getAddress() const { 488 assert(getFragment() && "Invalid getAddress() on undefined symbol!"); 489 return getFragment()->getAddress() + getOffset(); 490 } 491 492 /// @} 493 /// @name Symbol Attributes 494 /// @{ 495 496 bool isExternal() const { return IsExternal; } 497 void setExternal(bool Value) { IsExternal = Value; } 498 499 bool isPrivateExtern() const { return IsPrivateExtern; } 500 void setPrivateExtern(bool Value) { IsPrivateExtern = Value; } 501 502 /// isCommon - Is this a 'common' symbol. 503 bool isCommon() const { return CommonSize != 0; } 504 505 /// setCommon - Mark this symbol as being 'common'. 506 /// 507 /// \param Size - The size of the symbol. 508 /// \param Align - The alignment of the symbol. 509 void setCommon(uint64_t Size, unsigned Align) { 510 CommonSize = Size; 511 CommonAlign = Align; 512 } 513 514 /// getCommonSize - Return the size of a 'common' symbol. 515 uint64_t getCommonSize() const { 516 assert(isCommon() && "Not a 'common' symbol!"); 517 return CommonSize; 518 } 519 520 /// getCommonAlignment - Return the alignment of a 'common' symbol. 521 unsigned getCommonAlignment() const { 522 assert(isCommon() && "Not a 'common' symbol!"); 523 return CommonAlign; 524 } 525 526 /// getFlags - Get the (implementation defined) symbol flags. 527 uint32_t getFlags() const { return Flags; } 528 529 /// setFlags - Set the (implementation defined) symbol flags. 530 void setFlags(uint32_t Value) { Flags = Value; } 531 532 /// getIndex - Get the (implementation defined) index. 533 uint64_t getIndex() const { return Index; } 534 535 /// setIndex - Set the (implementation defined) index. 536 void setIndex(uint64_t Value) { Index = Value; } 537 538 /// @} 539 540 void dump(); 541}; 542 543// FIXME: This really doesn't belong here. See comments below. 544struct IndirectSymbolData { 545 MCSymbol *Symbol; 546 MCSectionData *SectionData; 547}; 548 549class MCAssembler { 550public: 551 typedef iplist<MCSectionData> SectionDataListType; 552 typedef iplist<MCSymbolData> SymbolDataListType; 553 554 typedef SectionDataListType::const_iterator const_iterator; 555 typedef SectionDataListType::iterator iterator; 556 557 typedef SymbolDataListType::const_iterator const_symbol_iterator; 558 typedef SymbolDataListType::iterator symbol_iterator; 559 560 typedef std::vector<IndirectSymbolData>::const_iterator 561 const_indirect_symbol_iterator; 562 typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator; 563 564private: 565 MCAssembler(const MCAssembler&); // DO NOT IMPLEMENT 566 void operator=(const MCAssembler&); // DO NOT IMPLEMENT 567 568 MCContext &Context; 569 570 TargetAsmBackend &Backend; 571 572 MCCodeEmitter &Emitter; 573 574 raw_ostream &OS; 575 576 iplist<MCSectionData> Sections; 577 578 iplist<MCSymbolData> Symbols; 579 580 /// The map of sections to their associated assembler backend data. 581 // 582 // FIXME: Avoid this indirection? 583 DenseMap<const MCSection*, MCSectionData*> SectionMap; 584 585 /// The map of symbols to their associated assembler backend data. 586 // 587 // FIXME: Avoid this indirection? 588 DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap; 589 590 std::vector<IndirectSymbolData> IndirectSymbols; 591 592 unsigned SubsectionsViaSymbols : 1; 593 594private: 595 /// Evaluate a fixup to a relocatable expression and the value which should be 596 /// placed into the fixup. 597 /// 598 /// \param Layout The layout to use for evaluation. 599 /// \param Fixup The fixup to evaluate. 600 /// \param DF The fragment the fixup is inside. 601 /// \param Target [out] On return, the relocatable expression the fixup 602 /// evaluates to. 603 /// \param Value [out] On return, the value of the fixup as currently layed 604 /// out. 605 /// \return Whether the fixup value was fully resolved. This is true if the 606 /// \arg Value result is fixed, otherwise the value may change due to 607 /// relocation. 608 bool EvaluateFixup(const MCAsmLayout &Layout, 609 MCAsmFixup &Fixup, MCDataFragment *DF, 610 MCValue &Target, uint64_t &Value) const; 611 612 /// Check whether a fixup can be satisfied, or whether it needs to be relaxed 613 /// (increased in size, in order to hold its value correctly). 614 bool FixupNeedsRelaxation(MCAsmFixup &Fixup, MCDataFragment *DF, 615 const MCAsmLayout &Layout) const; 616 617 /// LayoutSection - Assign offsets and sizes to the fragments in the section 618 /// \arg SD, and update the section size. The section file offset should 619 /// already have been computed. 620 void LayoutSection(MCSectionData &SD, MCAsmLayout &Layout); 621 622 /// LayoutOnce - Perform one layout iteration and return true if any offsets 623 /// were adjusted. 624 bool LayoutOnce(MCAsmLayout &Layout); 625 626public: 627 /// Find the symbol which defines the atom containing given address, inside 628 /// the given section, or null if there is no such symbol. 629 // 630 // FIXME: Eliminate this, it is very slow. 631 const MCSymbolData *getAtomForAddress(const MCSectionData *Section, 632 uint64_t Address) const; 633 634 /// Find the symbol which defines the atom containing the given symbol, or 635 /// null if there is no such symbol. 636 // 637 // FIXME: Eliminate this, it is very slow. 638 const MCSymbolData *getAtom(const MCSymbolData *Symbol) const; 639 640 /// Check whether a particular symbol is visible to the linker and is required 641 /// in the symbol table, or whether it can be discarded by the assembler. This 642 /// also effects whether the assembler treats the label as potentially 643 /// defining a separate atom. 644 bool isSymbolLinkerVisible(const MCSymbolData *SD) const; 645 646 /// Emit the section contents using the given object writer. 647 // 648 // FIXME: Should MCAssembler always have a reference to the object writer? 649 void WriteSectionData(const MCSectionData *Section, MCObjectWriter *OW) const; 650 651public: 652 /// Construct a new assembler instance. 653 /// 654 /// \arg OS - The stream to output to. 655 // 656 // FIXME: How are we going to parameterize this? Two obvious options are stay 657 // concrete and require clients to pass in a target like object. The other 658 // option is to make this abstract, and have targets provide concrete 659 // implementations as we do with AsmParser. 660 MCAssembler(MCContext &_Context, TargetAsmBackend &_Backend, 661 MCCodeEmitter &_Emitter, raw_ostream &OS); 662 ~MCAssembler(); 663 664 MCContext &getContext() const { return Context; } 665 666 TargetAsmBackend &getBackend() const { return Backend; } 667 668 MCCodeEmitter &getEmitter() const { return Emitter; } 669 670 /// Finish - Do final processing and write the object to the output stream. 671 void Finish(); 672 673 // FIXME: This does not belong here. 674 bool getSubsectionsViaSymbols() const { 675 return SubsectionsViaSymbols; 676 } 677 void setSubsectionsViaSymbols(bool Value) { 678 SubsectionsViaSymbols = Value; 679 } 680 681 /// @name Section List Access 682 /// @{ 683 684 const SectionDataListType &getSectionList() const { return Sections; } 685 SectionDataListType &getSectionList() { return Sections; } 686 687 iterator begin() { return Sections.begin(); } 688 const_iterator begin() const { return Sections.begin(); } 689 690 iterator end() { return Sections.end(); } 691 const_iterator end() const { return Sections.end(); } 692 693 size_t size() const { return Sections.size(); } 694 695 /// @} 696 /// @name Symbol List Access 697 /// @{ 698 699 const SymbolDataListType &getSymbolList() const { return Symbols; } 700 SymbolDataListType &getSymbolList() { return Symbols; } 701 702 symbol_iterator symbol_begin() { return Symbols.begin(); } 703 const_symbol_iterator symbol_begin() const { return Symbols.begin(); } 704 705 symbol_iterator symbol_end() { return Symbols.end(); } 706 const_symbol_iterator symbol_end() const { return Symbols.end(); } 707 708 size_t symbol_size() const { return Symbols.size(); } 709 710 /// @} 711 /// @name Indirect Symbol List Access 712 /// @{ 713 714 // FIXME: This is a total hack, this should not be here. Once things are 715 // factored so that the streamer has direct access to the .o writer, it can 716 // disappear. 717 std::vector<IndirectSymbolData> &getIndirectSymbols() { 718 return IndirectSymbols; 719 } 720 721 indirect_symbol_iterator indirect_symbol_begin() { 722 return IndirectSymbols.begin(); 723 } 724 const_indirect_symbol_iterator indirect_symbol_begin() const { 725 return IndirectSymbols.begin(); 726 } 727 728 indirect_symbol_iterator indirect_symbol_end() { 729 return IndirectSymbols.end(); 730 } 731 const_indirect_symbol_iterator indirect_symbol_end() const { 732 return IndirectSymbols.end(); 733 } 734 735 size_t indirect_symbol_size() const { return IndirectSymbols.size(); } 736 737 /// @} 738 /// @name Backend Data Access 739 /// @{ 740 741 MCSectionData &getSectionData(const MCSection &Section) const { 742 MCSectionData *Entry = SectionMap.lookup(&Section); 743 assert(Entry && "Missing section data!"); 744 return *Entry; 745 } 746 747 MCSectionData &getOrCreateSectionData(const MCSection &Section, 748 bool *Created = 0) { 749 MCSectionData *&Entry = SectionMap[&Section]; 750 751 if (Created) *Created = !Entry; 752 if (!Entry) 753 Entry = new MCSectionData(Section, this); 754 755 return *Entry; 756 } 757 758 MCSymbolData &getSymbolData(const MCSymbol &Symbol) const { 759 MCSymbolData *Entry = SymbolMap.lookup(&Symbol); 760 assert(Entry && "Missing symbol data!"); 761 return *Entry; 762 } 763 764 MCSymbolData &getOrCreateSymbolData(const MCSymbol &Symbol, 765 bool *Created = 0) { 766 MCSymbolData *&Entry = SymbolMap[&Symbol]; 767 768 if (Created) *Created = !Entry; 769 if (!Entry) 770 Entry = new MCSymbolData(Symbol, 0, 0, this); 771 772 return *Entry; 773 } 774 775 /// @} 776 777 void dump(); 778}; 779 780} // end namespace llvm 781 782#endif 783