MCAssembler.h revision b1e98945e4b107eb3f2ac1b54706c49864842dc4
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 MCExpr; 28class MCFragment; 29class MCSection; 30class MCSectionData; 31class MCSymbol; 32class MCValue; 33class TargetAsmBackend; 34 35/// MCAsmFixup - Represent a fixed size region of bytes inside some fragment 36/// which needs to be rewritten. This region will either be rewritten by the 37/// assembler or cause a relocation entry to be generated. 38struct MCAsmFixup { 39 /// Offset - The offset inside the fragment which needs to be rewritten. 40 uint64_t Offset; 41 42 /// Value - The expression to eventually write into the fragment. 43 const MCExpr *Value; 44 45 /// Kind - The fixup kind. 46 MCFixupKind Kind; 47 48public: 49 MCAsmFixup(uint64_t _Offset, const MCExpr &_Value, MCFixupKind _Kind) 50 : Offset(_Offset), Value(&_Value), Kind(_Kind) {} 51}; 52 53class MCFragment : public ilist_node<MCFragment> { 54 MCFragment(const MCFragment&); // DO NOT IMPLEMENT 55 void operator=(const MCFragment&); // DO NOT IMPLEMENT 56 57public: 58 enum FragmentType { 59 FT_Data, 60 FT_Align, 61 FT_Fill, 62 FT_Org, 63 FT_ZeroFill 64 }; 65 66private: 67 FragmentType Kind; 68 69 /// Parent - The data for the section this fragment is in. 70 MCSectionData *Parent; 71 72 /// @name Assembler Backend Data 73 /// @{ 74 // 75 // FIXME: This could all be kept private to the assembler implementation. 76 77 /// Offset - The offset of this fragment in its section. This is ~0 until 78 /// initialized. 79 uint64_t Offset; 80 81 /// FileSize - The file size of this section. This is ~0 until initialized. 82 uint64_t FileSize; 83 84 /// @} 85 86protected: 87 MCFragment(FragmentType _Kind, MCSectionData *_Parent = 0); 88 89public: 90 // Only for sentinel. 91 MCFragment(); 92 virtual ~MCFragment(); 93 94 FragmentType getKind() const { return Kind; } 95 96 MCSectionData *getParent() const { return Parent; } 97 void setParent(MCSectionData *Value) { Parent = Value; } 98 99 // FIXME: This should be abstract, fix sentinel. 100 virtual uint64_t getMaxFileSize() const { 101 assert(0 && "Invalid getMaxFileSize call!"); 102 return 0; 103 } 104 105 /// @name Assembler Backend Support 106 /// @{ 107 // 108 // FIXME: This could all be kept private to the assembler implementation. 109 110 uint64_t getAddress() const; 111 112 uint64_t getFileSize() const { 113 assert(FileSize != ~UINT64_C(0) && "File size not set!"); 114 return FileSize; 115 } 116 void setFileSize(uint64_t Value) { 117 assert(Value <= getMaxFileSize() && "Invalid file size!"); 118 FileSize = Value; 119 } 120 121 uint64_t getOffset() const { 122 assert(Offset != ~UINT64_C(0) && "File offset not set!"); 123 return Offset; 124 } 125 void setOffset(uint64_t Value) { Offset = Value; } 126 127 /// @} 128 129 static bool classof(const MCFragment *O) { return true; } 130 131 virtual void dump(); 132}; 133 134class MCDataFragment : public MCFragment { 135 SmallString<32> Contents; 136 137 /// Fixups - The list of fixups in this fragment. 138 std::vector<MCAsmFixup> Fixups; 139 140public: 141 typedef std::vector<MCAsmFixup>::const_iterator const_fixup_iterator; 142 typedef std::vector<MCAsmFixup>::iterator fixup_iterator; 143 144public: 145 MCDataFragment(MCSectionData *SD = 0) : MCFragment(FT_Data, SD) {} 146 147 /// @name Accessors 148 /// @{ 149 150 uint64_t getMaxFileSize() const { 151 return Contents.size(); 152 } 153 154 SmallString<32> &getContents() { return Contents; } 155 const SmallString<32> &getContents() const { return Contents; } 156 157 /// @} 158 159 /// @name Fixup Access 160 /// @{ 161 162 void addFixup(MCAsmFixup Fixup) { 163 // Enforce invariant that fixups are in offset order. 164 assert((Fixups.empty() || Fixup.Offset > Fixups.back().Offset) && 165 "Fixups must be added in order!"); 166 Fixups.push_back(Fixup); 167 } 168 169 std::vector<MCAsmFixup> &getFixups() { return Fixups; } 170 const std::vector<MCAsmFixup> &getFixups() const { return Fixups; } 171 172 fixup_iterator fixup_begin() { return Fixups.begin(); } 173 const_fixup_iterator fixup_begin() const { return Fixups.begin(); } 174 175 fixup_iterator fixup_end() {return Fixups.end();} 176 const_fixup_iterator fixup_end() const {return Fixups.end();} 177 178 size_t fixup_size() const { return Fixups.size(); } 179 180 /// @} 181 182 static bool classof(const MCFragment *F) { 183 return F->getKind() == MCFragment::FT_Data; 184 } 185 static bool classof(const MCDataFragment *) { return true; } 186 187 virtual void dump(); 188}; 189 190class MCAlignFragment : public MCFragment { 191 /// Alignment - The alignment to ensure, in bytes. 192 unsigned Alignment; 193 194 /// Value - Value to use for filling padding bytes. 195 int64_t Value; 196 197 /// ValueSize - The size of the integer (in bytes) of \arg Value. 198 unsigned ValueSize; 199 200 /// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment 201 /// cannot be satisfied in this width then this fragment is ignored. 202 unsigned MaxBytesToEmit; 203 204 /// EmitNops - true when aligning code and optimal nops to be used for 205 /// filling. 206 bool EmitNops; 207 208public: 209 MCAlignFragment(unsigned _Alignment, int64_t _Value, unsigned _ValueSize, 210 unsigned _MaxBytesToEmit, bool _EmitNops, 211 MCSectionData *SD = 0) 212 : MCFragment(FT_Align, SD), Alignment(_Alignment), 213 Value(_Value),ValueSize(_ValueSize), 214 MaxBytesToEmit(_MaxBytesToEmit), EmitNops(_EmitNops) {} 215 216 /// @name Accessors 217 /// @{ 218 219 uint64_t getMaxFileSize() const { 220 return std::max(Alignment - 1, MaxBytesToEmit); 221 } 222 223 unsigned getAlignment() const { return Alignment; } 224 225 int64_t getValue() const { return Value; } 226 227 unsigned getValueSize() const { return ValueSize; } 228 229 unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; } 230 231 unsigned getEmitNops() const { return EmitNops; } 232 233 /// @} 234 235 static bool classof(const MCFragment *F) { 236 return F->getKind() == MCFragment::FT_Align; 237 } 238 static bool classof(const MCAlignFragment *) { return true; } 239 240 virtual void dump(); 241}; 242 243class MCFillFragment : public MCFragment { 244 /// Value - Value to use for filling bytes. 245 int64_t Value; 246 247 /// ValueSize - The size (in bytes) of \arg Value to use when filling. 248 unsigned ValueSize; 249 250 /// Count - The number of copies of \arg Value to insert. 251 uint64_t Count; 252 253public: 254 MCFillFragment(int64_t _Value, unsigned _ValueSize, uint64_t _Count, 255 MCSectionData *SD = 0) 256 : MCFragment(FT_Fill, SD), 257 Value(_Value), ValueSize(_ValueSize), Count(_Count) {} 258 259 /// @name Accessors 260 /// @{ 261 262 uint64_t getMaxFileSize() const { 263 return ValueSize * Count; 264 } 265 266 int64_t getValue() const { return Value; } 267 268 unsigned getValueSize() const { return ValueSize; } 269 270 uint64_t getCount() const { return Count; } 271 272 /// @} 273 274 static bool classof(const MCFragment *F) { 275 return F->getKind() == MCFragment::FT_Fill; 276 } 277 static bool classof(const MCFillFragment *) { return true; } 278 279 virtual void dump(); 280}; 281 282class MCOrgFragment : public MCFragment { 283 /// Offset - The offset this fragment should start at. 284 const MCExpr *Offset; 285 286 /// Value - Value to use for filling bytes. 287 int8_t Value; 288 289public: 290 MCOrgFragment(const MCExpr &_Offset, int8_t _Value, MCSectionData *SD = 0) 291 : MCFragment(FT_Org, SD), 292 Offset(&_Offset), Value(_Value) {} 293 294 /// @name Accessors 295 /// @{ 296 297 uint64_t getMaxFileSize() const { 298 // FIXME: This doesn't make much sense. 299 return ~UINT64_C(0); 300 } 301 302 const MCExpr &getOffset() const { return *Offset; } 303 304 uint8_t getValue() const { return Value; } 305 306 /// @} 307 308 static bool classof(const MCFragment *F) { 309 return F->getKind() == MCFragment::FT_Org; 310 } 311 static bool classof(const MCOrgFragment *) { return true; } 312 313 virtual void dump(); 314}; 315 316/// MCZeroFillFragment - Represent data which has a fixed size and alignment, 317/// but requires no physical space in the object file. 318class MCZeroFillFragment : public MCFragment { 319 /// Size - The size of this fragment. 320 uint64_t Size; 321 322 /// Alignment - The alignment for this fragment. 323 unsigned Alignment; 324 325public: 326 MCZeroFillFragment(uint64_t _Size, unsigned _Alignment, MCSectionData *SD = 0) 327 : MCFragment(FT_ZeroFill, SD), 328 Size(_Size), Alignment(_Alignment) {} 329 330 /// @name Accessors 331 /// @{ 332 333 uint64_t getMaxFileSize() const { 334 // FIXME: This also doesn't make much sense, this method is misnamed. 335 return ~UINT64_C(0); 336 } 337 338 uint64_t getSize() const { return Size; } 339 340 unsigned getAlignment() const { return Alignment; } 341 342 /// @} 343 344 static bool classof(const MCFragment *F) { 345 return F->getKind() == MCFragment::FT_ZeroFill; 346 } 347 static bool classof(const MCZeroFillFragment *) { return true; } 348 349 virtual void dump(); 350}; 351 352// FIXME: Should this be a separate class, or just merged into MCSection? Since 353// we anticipate the fast path being through an MCAssembler, the only reason to 354// keep it out is for API abstraction. 355class MCSectionData : public ilist_node<MCSectionData> { 356 MCSectionData(const MCSectionData&); // DO NOT IMPLEMENT 357 void operator=(const MCSectionData&); // DO NOT IMPLEMENT 358 359public: 360 typedef iplist<MCFragment> FragmentListType; 361 362 typedef FragmentListType::const_iterator const_iterator; 363 typedef FragmentListType::iterator iterator; 364 365 typedef FragmentListType::const_reverse_iterator const_reverse_iterator; 366 typedef FragmentListType::reverse_iterator reverse_iterator; 367 368private: 369 iplist<MCFragment> Fragments; 370 const MCSection *Section; 371 372 /// Alignment - The maximum alignment seen in this section. 373 unsigned Alignment; 374 375 /// @name Assembler Backend Data 376 /// @{ 377 // 378 // FIXME: This could all be kept private to the assembler implementation. 379 380 /// Address - The computed address of this section. This is ~0 until 381 /// initialized. 382 uint64_t Address; 383 384 /// Size - The content size of this section. This is ~0 until initialized. 385 uint64_t Size; 386 387 /// FileSize - The size of this section in the object file. This is ~0 until 388 /// initialized. 389 uint64_t FileSize; 390 391 /// HasInstructions - Whether this section has had instructions emitted into 392 /// it. 393 unsigned HasInstructions : 1; 394 395 /// @} 396 397public: 398 // Only for use as sentinel. 399 MCSectionData(); 400 MCSectionData(const MCSection &Section, MCAssembler *A = 0); 401 402 const MCSection &getSection() const { return *Section; } 403 404 unsigned getAlignment() const { return Alignment; } 405 void setAlignment(unsigned Value) { Alignment = Value; } 406 407 /// @name Fragment Access 408 /// @{ 409 410 const FragmentListType &getFragmentList() const { return Fragments; } 411 FragmentListType &getFragmentList() { return Fragments; } 412 413 iterator begin() { return Fragments.begin(); } 414 const_iterator begin() const { return Fragments.begin(); } 415 416 iterator end() { return Fragments.end(); } 417 const_iterator end() const { return Fragments.end(); } 418 419 reverse_iterator rbegin() { return Fragments.rbegin(); } 420 const_reverse_iterator rbegin() const { return Fragments.rbegin(); } 421 422 reverse_iterator rend() { return Fragments.rend(); } 423 const_reverse_iterator rend() const { return Fragments.rend(); } 424 425 size_t size() const { return Fragments.size(); } 426 427 bool empty() const { return Fragments.empty(); } 428 429 /// @} 430 /// @name Assembler Backend Support 431 /// @{ 432 // 433 // FIXME: This could all be kept private to the assembler implementation. 434 435 uint64_t getAddress() const { 436 assert(Address != ~UINT64_C(0) && "Address not set!"); 437 return Address; 438 } 439 void setAddress(uint64_t Value) { Address = Value; } 440 441 uint64_t getSize() const { 442 assert(Size != ~UINT64_C(0) && "File size not set!"); 443 return Size; 444 } 445 void setSize(uint64_t Value) { Size = Value; } 446 447 uint64_t getFileSize() const { 448 assert(FileSize != ~UINT64_C(0) && "File size not set!"); 449 return FileSize; 450 } 451 void setFileSize(uint64_t Value) { FileSize = Value; } 452 453 bool hasInstructions() const { return HasInstructions; } 454 void setHasInstructions(bool Value) { HasInstructions = Value; } 455 456 /// @} 457 458 void dump(); 459}; 460 461// FIXME: Same concerns as with SectionData. 462class MCSymbolData : public ilist_node<MCSymbolData> { 463public: 464 const MCSymbol *Symbol; 465 466 /// Fragment - The fragment this symbol's value is relative to, if any. 467 MCFragment *Fragment; 468 469 /// Offset - The offset to apply to the fragment address to form this symbol's 470 /// value. 471 uint64_t Offset; 472 473 /// IsExternal - True if this symbol is visible outside this translation 474 /// unit. 475 unsigned IsExternal : 1; 476 477 /// IsPrivateExtern - True if this symbol is private extern. 478 unsigned IsPrivateExtern : 1; 479 480 /// CommonSize - The size of the symbol, if it is 'common', or 0. 481 // 482 // FIXME: Pack this in with other fields? We could put it in offset, since a 483 // common symbol can never get a definition. 484 uint64_t CommonSize; 485 486 /// CommonAlign - The alignment of the symbol, if it is 'common'. 487 // 488 // FIXME: Pack this in with other fields? 489 unsigned CommonAlign; 490 491 /// Flags - The Flags field is used by object file implementations to store 492 /// additional per symbol information which is not easily classified. 493 uint32_t Flags; 494 495 /// Index - Index field, for use by the object file implementation. 496 uint64_t Index; 497 498public: 499 // Only for use as sentinel. 500 MCSymbolData(); 501 MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset, 502 MCAssembler *A = 0); 503 504 /// @name Accessors 505 /// @{ 506 507 const MCSymbol &getSymbol() const { return *Symbol; } 508 509 MCFragment *getFragment() const { return Fragment; } 510 void setFragment(MCFragment *Value) { Fragment = Value; } 511 512 uint64_t getOffset() const { return Offset; } 513 void setOffset(uint64_t Value) { Offset = Value; } 514 515 uint64_t getAddress() const { 516 assert(getFragment() && "Invalid getAddress() on undefined symbol!"); 517 return getFragment()->getAddress() + getOffset(); 518 } 519 520 /// @} 521 /// @name Symbol Attributes 522 /// @{ 523 524 bool isExternal() const { return IsExternal; } 525 void setExternal(bool Value) { IsExternal = Value; } 526 527 bool isPrivateExtern() const { return IsPrivateExtern; } 528 void setPrivateExtern(bool Value) { IsPrivateExtern = Value; } 529 530 /// isCommon - Is this a 'common' symbol. 531 bool isCommon() const { return CommonSize != 0; } 532 533 /// setCommon - Mark this symbol as being 'common'. 534 /// 535 /// \param Size - The size of the symbol. 536 /// \param Align - The alignment of the symbol. 537 void setCommon(uint64_t Size, unsigned Align) { 538 CommonSize = Size; 539 CommonAlign = Align; 540 } 541 542 /// getCommonSize - Return the size of a 'common' symbol. 543 uint64_t getCommonSize() const { 544 assert(isCommon() && "Not a 'common' symbol!"); 545 return CommonSize; 546 } 547 548 /// getCommonAlignment - Return the alignment of a 'common' symbol. 549 unsigned getCommonAlignment() const { 550 assert(isCommon() && "Not a 'common' symbol!"); 551 return CommonAlign; 552 } 553 554 /// getFlags - Get the (implementation defined) symbol flags. 555 uint32_t getFlags() const { return Flags; } 556 557 /// setFlags - Set the (implementation defined) symbol flags. 558 void setFlags(uint32_t Value) { Flags = Value; } 559 560 /// getIndex - Get the (implementation defined) index. 561 uint64_t getIndex() const { return Index; } 562 563 /// setIndex - Set the (implementation defined) index. 564 void setIndex(uint64_t Value) { Index = Value; } 565 566 /// @} 567 568 void dump(); 569}; 570 571// FIXME: This really doesn't belong here. See comments below. 572struct IndirectSymbolData { 573 MCSymbol *Symbol; 574 MCSectionData *SectionData; 575}; 576 577class MCAssembler { 578public: 579 typedef iplist<MCSectionData> SectionDataListType; 580 typedef iplist<MCSymbolData> SymbolDataListType; 581 582 typedef SectionDataListType::const_iterator const_iterator; 583 typedef SectionDataListType::iterator iterator; 584 585 typedef SymbolDataListType::const_iterator const_symbol_iterator; 586 typedef SymbolDataListType::iterator symbol_iterator; 587 588 typedef std::vector<IndirectSymbolData>::const_iterator 589 const_indirect_symbol_iterator; 590 typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator; 591 592private: 593 MCAssembler(const MCAssembler&); // DO NOT IMPLEMENT 594 void operator=(const MCAssembler&); // DO NOT IMPLEMENT 595 596 MCContext &Context; 597 598 TargetAsmBackend &Backend; 599 600 raw_ostream &OS; 601 602 iplist<MCSectionData> Sections; 603 604 iplist<MCSymbolData> Symbols; 605 606 /// The map of sections to their associated assembler backend data. 607 // 608 // FIXME: Avoid this indirection? 609 DenseMap<const MCSection*, MCSectionData*> SectionMap; 610 611 /// The map of symbols to their associated assembler backend data. 612 // 613 // FIXME: Avoid this indirection? 614 DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap; 615 616 std::vector<IndirectSymbolData> IndirectSymbols; 617 618 unsigned SubsectionsViaSymbols : 1; 619 620private: 621 /// Check whether a fixup can be satisfied, or whether it needs to be relaxed 622 /// (increased in size, in order to hold its value correctly). 623 bool FixupNeedsRelaxation(MCAsmFixup &Fixup, MCDataFragment *DF); 624 625 /// LayoutSection - Assign offsets and sizes to the fragments in the section 626 /// \arg SD, and update the section size. The section file offset should 627 /// already have been computed. 628 void LayoutSection(MCSectionData &SD); 629 630 /// LayoutOnce - Perform one layout iteration and return true if any offsets 631 /// were adjusted. 632 bool LayoutOnce(); 633 634 // FIXME: Make protected once we factor out object writer classes. 635public: 636 /// Find the symbol which defines the atom containing given address, inside 637 /// the given section, or null if there is no such symbol. 638 // 639 // FIXME: Eliminate this, it is very slow. 640 const MCSymbolData *getAtomForAddress(const MCSectionData *Section, 641 uint64_t Address) const; 642 643 /// Find the symbol which defines the atom containing the given symbol, or 644 /// null if there is no such symbol. 645 // 646 // FIXME: Eliminate this, it is very slow. 647 const MCSymbolData *getAtom(const MCSymbolData *Symbol) const; 648 649 /// Check whether a particular symbol is visible to the linker and is required 650 /// in the symbol table, or whether it can be discarded by the assembler. This 651 /// also effects whether the assembler treats the label as potentially 652 /// defining a separate atom. 653 bool isSymbolLinkerVisible(const MCSymbolData *SD) const; 654 655 /// Evaluate a fixup to a relocatable expression and the value which should be 656 /// placed into the fixup. 657 /// 658 /// \param Layout The layout to use for evaluation. 659 /// \param Fixup The fixup to evaluate. 660 /// \param DF The fragment the fixup is inside. 661 /// \param Target [out] On return, the relocatable expression the fixup 662 /// evaluates to. 663 /// \param Value [out] On return, the value of the fixup as currently layed 664 /// out. 665 /// \return Whether the fixup value was fully resolved. This is true if the 666 /// \arg Value result is fixed, otherwise the value may change due to 667 /// relocation. 668 bool EvaluateFixup(const MCAsmLayout &Layout, 669 MCAsmFixup &Fixup, MCDataFragment *DF, 670 MCValue &Target, uint64_t &Value) const; 671 672public: 673 /// Construct a new assembler instance. 674 /// 675 /// \arg OS - The stream to output to. 676 // 677 // FIXME: How are we going to parameterize this? Two obvious options are stay 678 // concrete and require clients to pass in a target like object. The other 679 // option is to make this abstract, and have targets provide concrete 680 // implementations as we do with AsmParser. 681 MCAssembler(MCContext &_Context, TargetAsmBackend &_Backend, raw_ostream &OS); 682 ~MCAssembler(); 683 684 MCContext &getContext() const { return Context; } 685 686 TargetAsmBackend &getBackend() const { return Backend; } 687 688 /// Finish - Do final processing and write the object to the output stream. 689 void Finish(); 690 691 // FIXME: This does not belong here. 692 bool getSubsectionsViaSymbols() const { 693 return SubsectionsViaSymbols; 694 } 695 void setSubsectionsViaSymbols(bool Value) { 696 SubsectionsViaSymbols = Value; 697 } 698 699 /// @name Section List Access 700 /// @{ 701 702 const SectionDataListType &getSectionList() const { return Sections; } 703 SectionDataListType &getSectionList() { return Sections; } 704 705 iterator begin() { return Sections.begin(); } 706 const_iterator begin() const { return Sections.begin(); } 707 708 iterator end() { return Sections.end(); } 709 const_iterator end() const { return Sections.end(); } 710 711 size_t size() const { return Sections.size(); } 712 713 /// @} 714 /// @name Symbol List Access 715 /// @{ 716 717 const SymbolDataListType &getSymbolList() const { return Symbols; } 718 SymbolDataListType &getSymbolList() { return Symbols; } 719 720 symbol_iterator symbol_begin() { return Symbols.begin(); } 721 const_symbol_iterator symbol_begin() const { return Symbols.begin(); } 722 723 symbol_iterator symbol_end() { return Symbols.end(); } 724 const_symbol_iterator symbol_end() const { return Symbols.end(); } 725 726 size_t symbol_size() const { return Symbols.size(); } 727 728 /// @} 729 /// @name Indirect Symbol List Access 730 /// @{ 731 732 // FIXME: This is a total hack, this should not be here. Once things are 733 // factored so that the streamer has direct access to the .o writer, it can 734 // disappear. 735 std::vector<IndirectSymbolData> &getIndirectSymbols() { 736 return IndirectSymbols; 737 } 738 739 indirect_symbol_iterator indirect_symbol_begin() { 740 return IndirectSymbols.begin(); 741 } 742 const_indirect_symbol_iterator indirect_symbol_begin() const { 743 return IndirectSymbols.begin(); 744 } 745 746 indirect_symbol_iterator indirect_symbol_end() { 747 return IndirectSymbols.end(); 748 } 749 const_indirect_symbol_iterator indirect_symbol_end() const { 750 return IndirectSymbols.end(); 751 } 752 753 size_t indirect_symbol_size() const { return IndirectSymbols.size(); } 754 755 /// @} 756 /// @name Backend Data Access 757 /// @{ 758 759 MCSectionData &getSectionData(const MCSection &Section) const { 760 MCSectionData *Entry = SectionMap.lookup(&Section); 761 assert(Entry && "Missing section data!"); 762 return *Entry; 763 } 764 765 MCSectionData &getOrCreateSectionData(const MCSection &Section, 766 bool *Created = 0) { 767 MCSectionData *&Entry = SectionMap[&Section]; 768 769 if (Created) *Created = !Entry; 770 if (!Entry) 771 Entry = new MCSectionData(Section, this); 772 773 return *Entry; 774 } 775 776 MCSymbolData &getSymbolData(const MCSymbol &Symbol) const { 777 MCSymbolData *Entry = SymbolMap.lookup(&Symbol); 778 assert(Entry && "Missing symbol data!"); 779 return *Entry; 780 } 781 782 MCSymbolData &getOrCreateSymbolData(const MCSymbol &Symbol, 783 bool *Created = 0) { 784 MCSymbolData *&Entry = SymbolMap[&Symbol]; 785 786 if (Created) *Created = !Entry; 787 if (!Entry) 788 Entry = new MCSymbolData(Symbol, 0, 0, this); 789 790 return *Entry; 791 } 792 793 /// @} 794 795 void dump(); 796}; 797 798} // end namespace llvm 799 800#endif 801