MCAssembler.h revision 5d428511ca9607d52a09d3483d0738f483e09934
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/MC/MCInst.h" 20#include "llvm/System/DataTypes.h" 21#include <vector> // FIXME: Shouldn't be needed. 22 23namespace llvm { 24class raw_ostream; 25class MCAsmLayout; 26class MCAssembler; 27class MCContext; 28class MCCodeEmitter; 29class MCExpr; 30class MCFragment; 31class MCObjectWriter; 32class MCSection; 33class MCSectionData; 34class MCSymbol; 35class MCValue; 36class TargetAsmBackend; 37 38/// MCAsmFixup - Represent a fixed size region of bytes inside some fragment 39/// which needs to be rewritten. This region will either be rewritten by the 40/// assembler or cause a relocation entry to be generated. 41// 42// FIXME: This should probably just be merged with MCFixup. 43class MCAsmFixup { 44public: 45 /// Offset - The offset inside the fragment which needs to be rewritten. 46 uint64_t Offset; 47 48 /// Value - The expression to eventually write into the fragment. 49 const MCExpr *Value; 50 51 /// Kind - The fixup kind. 52 MCFixupKind Kind; 53 54public: 55 MCAsmFixup(uint64_t _Offset, const MCExpr &_Value, MCFixupKind _Kind) 56 : Offset(_Offset), Value(&_Value), Kind(_Kind) {} 57}; 58 59class MCFragment : public ilist_node<MCFragment> { 60 friend class MCAsmLayout; 61 62 MCFragment(const MCFragment&); // DO NOT IMPLEMENT 63 void operator=(const MCFragment&); // DO NOT IMPLEMENT 64 65public: 66 enum FragmentType { 67 FT_Align, 68 FT_Data, 69 FT_Fill, 70 FT_Inst, 71 FT_Org, 72 FT_ZeroFill 73 }; 74 75private: 76 FragmentType Kind; 77 78 /// Parent - The data for the section this fragment is in. 79 MCSectionData *Parent; 80 81 /// @name Assembler Backend Data 82 /// @{ 83 // 84 // FIXME: This could all be kept private to the assembler implementation. 85 86 /// Offset - The offset of this fragment in its section. This is ~0 until 87 /// initialized. 88 uint64_t Offset; 89 90 /// EffectiveSize - The compute size of this section. This is ~0 until 91 /// initialized. 92 uint64_t EffectiveSize; 93 94 /// @} 95 96protected: 97 MCFragment(FragmentType _Kind, MCSectionData *_Parent = 0); 98 99public: 100 // Only for sentinel. 101 MCFragment(); 102 virtual ~MCFragment(); 103 104 FragmentType getKind() const { return Kind; } 105 106 MCSectionData *getParent() const { return Parent; } 107 void setParent(MCSectionData *Value) { Parent = Value; } 108 109 static bool classof(const MCFragment *O) { return true; } 110 111 virtual void dump(); 112}; 113 114class MCDataFragment : public MCFragment { 115 SmallString<32> Contents; 116 117 /// Fixups - The list of fixups in this fragment. 118 std::vector<MCAsmFixup> Fixups; 119 120public: 121 typedef std::vector<MCAsmFixup>::const_iterator const_fixup_iterator; 122 typedef std::vector<MCAsmFixup>::iterator fixup_iterator; 123 124public: 125 MCDataFragment(MCSectionData *SD = 0) : MCFragment(FT_Data, SD) {} 126 127 /// @name Accessors 128 /// @{ 129 130 SmallString<32> &getContents() { return Contents; } 131 const SmallString<32> &getContents() const { return Contents; } 132 133 /// @} 134 /// @name Fixup Access 135 /// @{ 136 137 void addFixup(MCAsmFixup Fixup) { 138 // Enforce invariant that fixups are in offset order. 139 assert((Fixups.empty() || Fixup.Offset > Fixups.back().Offset) && 140 "Fixups must be added in order!"); 141 Fixups.push_back(Fixup); 142 } 143 144 std::vector<MCAsmFixup> &getFixups() { return Fixups; } 145 const std::vector<MCAsmFixup> &getFixups() const { return Fixups; } 146 147 fixup_iterator fixup_begin() { return Fixups.begin(); } 148 const_fixup_iterator fixup_begin() const { return Fixups.begin(); } 149 150 fixup_iterator fixup_end() {return Fixups.end();} 151 const_fixup_iterator fixup_end() const {return Fixups.end();} 152 153 size_t fixup_size() const { return Fixups.size(); } 154 155 /// @} 156 157 static bool classof(const MCFragment *F) { 158 return F->getKind() == MCFragment::FT_Data; 159 } 160 static bool classof(const MCDataFragment *) { return true; } 161 162 virtual void dump(); 163}; 164 165// FIXME: This current incarnation of MCInstFragment doesn't make much sense, as 166// it is almost entirely a duplicate of MCDataFragment. If we decide to stick 167// with this approach (as opposed to making MCInstFragment a very light weight 168// object with just the MCInst and a code size, then we should just change 169// MCDataFragment to have an optional MCInst at its end. 170class MCInstFragment : public MCFragment { 171 /// Inst - The instruction this is a fragment for. 172 MCInst Inst; 173 174 /// InstSize - The size of the currently encoded instruction. 175 SmallString<8> Code; 176 177 /// Fixups - The list of fixups in this fragment. 178 SmallVector<MCAsmFixup, 1> Fixups; 179 180public: 181 typedef SmallVectorImpl<MCAsmFixup>::const_iterator const_fixup_iterator; 182 typedef SmallVectorImpl<MCAsmFixup>::iterator fixup_iterator; 183 184public: 185 MCInstFragment(MCInst _Inst, MCSectionData *SD = 0) 186 : MCFragment(FT_Inst, SD), Inst(_Inst) { 187 } 188 189 /// @name Accessors 190 /// @{ 191 192 SmallVectorImpl<char> &getCode() { return Code; } 193 const SmallVectorImpl<char> &getCode() const { return Code; } 194 195 unsigned getInstSize() const { return Code.size(); } 196 197 MCInst &getInst() { return Inst; } 198 const MCInst &getInst() const { return Inst; } 199 200 void setInst(MCInst Value) { Inst = Value; } 201 202 /// @} 203 /// @name Fixup Access 204 /// @{ 205 206 SmallVectorImpl<MCAsmFixup> &getFixups() { return Fixups; } 207 const SmallVectorImpl<MCAsmFixup> &getFixups() const { return Fixups; } 208 209 fixup_iterator fixup_begin() { return Fixups.begin(); } 210 const_fixup_iterator fixup_begin() const { return Fixups.begin(); } 211 212 fixup_iterator fixup_end() {return Fixups.end();} 213 const_fixup_iterator fixup_end() const {return Fixups.end();} 214 215 size_t fixup_size() const { return Fixups.size(); } 216 217 /// @} 218 219 static bool classof(const MCFragment *F) { 220 return F->getKind() == MCFragment::FT_Inst; 221 } 222 static bool classof(const MCInstFragment *) { return true; } 223 224 virtual void dump(); 225}; 226 227class MCAlignFragment : public MCFragment { 228 /// Alignment - The alignment to ensure, in bytes. 229 unsigned Alignment; 230 231 /// Value - Value to use for filling padding bytes. 232 int64_t Value; 233 234 /// ValueSize - The size of the integer (in bytes) of \arg Value. 235 unsigned ValueSize; 236 237 /// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment 238 /// cannot be satisfied in this width then this fragment is ignored. 239 unsigned MaxBytesToEmit; 240 241 /// EmitNops - true when aligning code and optimal nops to be used for 242 /// filling. 243 bool EmitNops; 244 245public: 246 MCAlignFragment(unsigned _Alignment, int64_t _Value, unsigned _ValueSize, 247 unsigned _MaxBytesToEmit, bool _EmitNops, 248 MCSectionData *SD = 0) 249 : MCFragment(FT_Align, SD), Alignment(_Alignment), 250 Value(_Value),ValueSize(_ValueSize), 251 MaxBytesToEmit(_MaxBytesToEmit), EmitNops(_EmitNops) {} 252 253 /// @name Accessors 254 /// @{ 255 256 unsigned getAlignment() const { return Alignment; } 257 258 int64_t getValue() const { return Value; } 259 260 unsigned getValueSize() const { return ValueSize; } 261 262 unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; } 263 264 unsigned getEmitNops() const { return EmitNops; } 265 266 /// @} 267 268 static bool classof(const MCFragment *F) { 269 return F->getKind() == MCFragment::FT_Align; 270 } 271 static bool classof(const MCAlignFragment *) { return true; } 272 273 virtual void dump(); 274}; 275 276class MCFillFragment : public MCFragment { 277 /// Value - Value to use for filling bytes. 278 int64_t Value; 279 280 /// ValueSize - The size (in bytes) of \arg Value to use when filling. 281 unsigned ValueSize; 282 283 /// Count - The number of copies of \arg Value to insert. 284 uint64_t Count; 285 286public: 287 MCFillFragment(int64_t _Value, unsigned _ValueSize, uint64_t _Count, 288 MCSectionData *SD = 0) 289 : MCFragment(FT_Fill, SD), 290 Value(_Value), ValueSize(_ValueSize), Count(_Count) {} 291 292 /// @name Accessors 293 /// @{ 294 295 int64_t getValue() const { return Value; } 296 297 unsigned getValueSize() const { return ValueSize; } 298 299 uint64_t getCount() const { return Count; } 300 301 /// @} 302 303 static bool classof(const MCFragment *F) { 304 return F->getKind() == MCFragment::FT_Fill; 305 } 306 static bool classof(const MCFillFragment *) { return true; } 307 308 virtual void dump(); 309}; 310 311class MCOrgFragment : public MCFragment { 312 /// Offset - The offset this fragment should start at. 313 const MCExpr *Offset; 314 315 /// Value - Value to use for filling bytes. 316 int8_t Value; 317 318public: 319 MCOrgFragment(const MCExpr &_Offset, int8_t _Value, MCSectionData *SD = 0) 320 : MCFragment(FT_Org, SD), 321 Offset(&_Offset), Value(_Value) {} 322 323 /// @name Accessors 324 /// @{ 325 326 const MCExpr &getOffset() const { return *Offset; } 327 328 uint8_t getValue() const { return Value; } 329 330 /// @} 331 332 static bool classof(const MCFragment *F) { 333 return F->getKind() == MCFragment::FT_Org; 334 } 335 static bool classof(const MCOrgFragment *) { return true; } 336 337 virtual void dump(); 338}; 339 340/// MCZeroFillFragment - Represent data which has a fixed size and alignment, 341/// but requires no physical space in the object file. 342class MCZeroFillFragment : public MCFragment { 343 /// Size - The size of this fragment. 344 uint64_t Size; 345 346 /// Alignment - The alignment for this fragment. 347 unsigned Alignment; 348 349public: 350 MCZeroFillFragment(uint64_t _Size, unsigned _Alignment, MCSectionData *SD = 0) 351 : MCFragment(FT_ZeroFill, SD), 352 Size(_Size), Alignment(_Alignment) {} 353 354 /// @name Accessors 355 /// @{ 356 357 uint64_t getSize() const { return Size; } 358 359 unsigned getAlignment() const { return Alignment; } 360 361 /// @} 362 363 static bool classof(const MCFragment *F) { 364 return F->getKind() == MCFragment::FT_ZeroFill; 365 } 366 static bool classof(const MCZeroFillFragment *) { return true; } 367 368 virtual void dump(); 369}; 370 371// FIXME: Should this be a separate class, or just merged into MCSection? Since 372// we anticipate the fast path being through an MCAssembler, the only reason to 373// keep it out is for API abstraction. 374class MCSectionData : public ilist_node<MCSectionData> { 375 friend class MCAsmLayout; 376 377 MCSectionData(const MCSectionData&); // DO NOT IMPLEMENT 378 void operator=(const MCSectionData&); // DO NOT IMPLEMENT 379 380public: 381 typedef iplist<MCFragment> FragmentListType; 382 383 typedef FragmentListType::const_iterator const_iterator; 384 typedef FragmentListType::iterator iterator; 385 386 typedef FragmentListType::const_reverse_iterator const_reverse_iterator; 387 typedef FragmentListType::reverse_iterator reverse_iterator; 388 389private: 390 iplist<MCFragment> Fragments; 391 const MCSection *Section; 392 393 /// Alignment - The maximum alignment seen in this section. 394 unsigned Alignment; 395 396 /// @name Assembler Backend Data 397 /// @{ 398 // 399 // FIXME: This could all be kept private to the assembler implementation. 400 401 /// Address - The computed address of this section. This is ~0 until 402 /// initialized. 403 uint64_t Address; 404 405 /// Size - The content size of this section. This is ~0 until initialized. 406 uint64_t Size; 407 408 /// FileSize - The size of this section in the object file. This is ~0 until 409 /// initialized. 410 uint64_t FileSize; 411 412 /// HasInstructions - Whether this section has had instructions emitted into 413 /// it. 414 unsigned HasInstructions : 1; 415 416 /// @} 417 418public: 419 // Only for use as sentinel. 420 MCSectionData(); 421 MCSectionData(const MCSection &Section, MCAssembler *A = 0); 422 423 const MCSection &getSection() const { return *Section; } 424 425 unsigned getAlignment() const { return Alignment; } 426 void setAlignment(unsigned Value) { Alignment = Value; } 427 428 bool hasInstructions() const { return HasInstructions; } 429 void setHasInstructions(bool Value) { HasInstructions = Value; } 430 431 /// @name Fragment Access 432 /// @{ 433 434 const FragmentListType &getFragmentList() const { return Fragments; } 435 FragmentListType &getFragmentList() { return Fragments; } 436 437 iterator begin() { return Fragments.begin(); } 438 const_iterator begin() const { return Fragments.begin(); } 439 440 iterator end() { return Fragments.end(); } 441 const_iterator end() const { return Fragments.end(); } 442 443 reverse_iterator rbegin() { return Fragments.rbegin(); } 444 const_reverse_iterator rbegin() const { return Fragments.rbegin(); } 445 446 reverse_iterator rend() { return Fragments.rend(); } 447 const_reverse_iterator rend() const { return Fragments.rend(); } 448 449 size_t size() const { return Fragments.size(); } 450 451 bool empty() const { return Fragments.empty(); } 452 453 void dump(); 454}; 455 456// FIXME: Same concerns as with SectionData. 457class MCSymbolData : public ilist_node<MCSymbolData> { 458public: 459 const MCSymbol *Symbol; 460 461 /// Fragment - The fragment this symbol's value is relative to, if any. 462 MCFragment *Fragment; 463 464 /// Offset - The offset to apply to the fragment address to form this symbol's 465 /// value. 466 uint64_t Offset; 467 468 /// IsExternal - True if this symbol is visible outside this translation 469 /// unit. 470 unsigned IsExternal : 1; 471 472 /// IsPrivateExtern - True if this symbol is private extern. 473 unsigned IsPrivateExtern : 1; 474 475 /// CommonSize - The size of the symbol, if it is 'common', or 0. 476 // 477 // FIXME: Pack this in with other fields? We could put it in offset, since a 478 // common symbol can never get a definition. 479 uint64_t CommonSize; 480 481 /// CommonAlign - The alignment of the symbol, if it is 'common'. 482 // 483 // FIXME: Pack this in with other fields? 484 unsigned CommonAlign; 485 486 /// Flags - The Flags field is used by object file implementations to store 487 /// additional per symbol information which is not easily classified. 488 uint32_t Flags; 489 490 /// Index - Index field, for use by the object file implementation. 491 uint64_t Index; 492 493public: 494 // Only for use as sentinel. 495 MCSymbolData(); 496 MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset, 497 MCAssembler *A = 0); 498 499 /// @name Accessors 500 /// @{ 501 502 const MCSymbol &getSymbol() const { return *Symbol; } 503 504 MCFragment *getFragment() const { return Fragment; } 505 void setFragment(MCFragment *Value) { Fragment = Value; } 506 507 uint64_t getOffset() const { return Offset; } 508 void setOffset(uint64_t Value) { Offset = Value; } 509 510 /// @} 511 /// @name Symbol Attributes 512 /// @{ 513 514 bool isExternal() const { return IsExternal; } 515 void setExternal(bool Value) { IsExternal = Value; } 516 517 bool isPrivateExtern() const { return IsPrivateExtern; } 518 void setPrivateExtern(bool Value) { IsPrivateExtern = Value; } 519 520 /// isCommon - Is this a 'common' symbol. 521 bool isCommon() const { return CommonSize != 0; } 522 523 /// setCommon - Mark this symbol as being 'common'. 524 /// 525 /// \param Size - The size of the symbol. 526 /// \param Align - The alignment of the symbol. 527 void setCommon(uint64_t Size, unsigned Align) { 528 CommonSize = Size; 529 CommonAlign = Align; 530 } 531 532 /// getCommonSize - Return the size of a 'common' symbol. 533 uint64_t getCommonSize() const { 534 assert(isCommon() && "Not a 'common' symbol!"); 535 return CommonSize; 536 } 537 538 /// getCommonAlignment - Return the alignment of a 'common' symbol. 539 unsigned getCommonAlignment() const { 540 assert(isCommon() && "Not a 'common' symbol!"); 541 return CommonAlign; 542 } 543 544 /// getFlags - Get the (implementation defined) symbol flags. 545 uint32_t getFlags() const { return Flags; } 546 547 /// setFlags - Set the (implementation defined) symbol flags. 548 void setFlags(uint32_t Value) { Flags = Value; } 549 550 /// getIndex - Get the (implementation defined) index. 551 uint64_t getIndex() const { return Index; } 552 553 /// setIndex - Set the (implementation defined) index. 554 void setIndex(uint64_t Value) { Index = Value; } 555 556 /// @} 557 558 void dump(); 559}; 560 561// FIXME: This really doesn't belong here. See comments below. 562struct IndirectSymbolData { 563 MCSymbol *Symbol; 564 MCSectionData *SectionData; 565}; 566 567class MCAssembler { 568public: 569 typedef iplist<MCSectionData> SectionDataListType; 570 typedef iplist<MCSymbolData> SymbolDataListType; 571 572 typedef SectionDataListType::const_iterator const_iterator; 573 typedef SectionDataListType::iterator iterator; 574 575 typedef SymbolDataListType::const_iterator const_symbol_iterator; 576 typedef SymbolDataListType::iterator symbol_iterator; 577 578 typedef std::vector<IndirectSymbolData>::const_iterator 579 const_indirect_symbol_iterator; 580 typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator; 581 582private: 583 MCAssembler(const MCAssembler&); // DO NOT IMPLEMENT 584 void operator=(const MCAssembler&); // DO NOT IMPLEMENT 585 586 MCContext &Context; 587 588 TargetAsmBackend &Backend; 589 590 MCCodeEmitter &Emitter; 591 592 raw_ostream &OS; 593 594 iplist<MCSectionData> Sections; 595 596 iplist<MCSymbolData> Symbols; 597 598 /// The map of sections to their associated assembler backend data. 599 // 600 // FIXME: Avoid this indirection? 601 DenseMap<const MCSection*, MCSectionData*> SectionMap; 602 603 /// The map of symbols to their associated assembler backend data. 604 // 605 // FIXME: Avoid this indirection? 606 DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap; 607 608 std::vector<IndirectSymbolData> IndirectSymbols; 609 610 unsigned SubsectionsViaSymbols : 1; 611 612private: 613 /// Evaluate a fixup to a relocatable expression and the value which should be 614 /// placed into the fixup. 615 /// 616 /// \param Layout The layout to use for evaluation. 617 /// \param Fixup The fixup to evaluate. 618 /// \param DF The fragment the fixup is inside. 619 /// \param Target [out] On return, the relocatable expression the fixup 620 /// evaluates to. 621 /// \param Value [out] On return, the value of the fixup as currently layed 622 /// out. 623 /// \return Whether the fixup value was fully resolved. This is true if the 624 /// \arg Value result is fixed, otherwise the value may change due to 625 /// relocation. 626 bool EvaluateFixup(const MCAsmLayout &Layout, 627 const MCAsmFixup &Fixup, const MCFragment *DF, 628 MCValue &Target, uint64_t &Value) const; 629 630 /// Check whether a fixup can be satisfied, or whether it needs to be relaxed 631 /// (increased in size, in order to hold its value correctly). 632 bool FixupNeedsRelaxation(const MCAsmFixup &Fixup, const MCFragment *DF, 633 const MCAsmLayout &Layout) const; 634 635 /// Check whether the given fragment needs relaxation. 636 bool FragmentNeedsRelaxation(const MCInstFragment *IF, 637 const MCAsmLayout &Layout) const; 638 639 /// LayoutSection - Assign offsets and sizes to the fragments in the section 640 /// \arg SD, and update the section size. The section file offset should 641 /// already have been computed. 642 void LayoutSection(MCSectionData &SD, MCAsmLayout &Layout); 643 644 /// LayoutOnce - Perform one layout iteration and return true if any offsets 645 /// were adjusted. 646 bool LayoutOnce(MCAsmLayout &Layout); 647 648 /// FinishLayout - Finalize a layout, including fragment lowering. 649 void FinishLayout(MCAsmLayout &Layout); 650 651public: 652 /// Find the symbol which defines the atom containing given address, inside 653 /// the given section, or null if there is no such symbol. 654 // 655 // FIXME-PERF: Eliminate this, it is very slow. 656 const MCSymbolData *getAtomForAddress(const MCAsmLayout &Layout, 657 const MCSectionData *Section, 658 uint64_t Address) const; 659 660 /// Find the symbol which defines the atom containing the given symbol, or 661 /// null if there is no such symbol. 662 // 663 // FIXME-PERF: Eliminate this, it is very slow. 664 const MCSymbolData *getAtom(const MCAsmLayout &Layout, 665 const MCSymbolData *Symbol) const; 666 667 /// Check whether a particular symbol is visible to the linker and is required 668 /// in the symbol table, or whether it can be discarded by the assembler. This 669 /// also effects whether the assembler treats the label as potentially 670 /// defining a separate atom. 671 bool isSymbolLinkerVisible(const MCSymbolData *SD) const; 672 673 /// Emit the section contents using the given object writer. 674 // 675 // FIXME: Should MCAssembler always have a reference to the object writer? 676 void WriteSectionData(const MCSectionData *Section, const MCAsmLayout &Layout, 677 MCObjectWriter *OW) const; 678 679public: 680 /// Construct a new assembler instance. 681 /// 682 /// \arg OS - The stream to output to. 683 // 684 // FIXME: How are we going to parameterize this? Two obvious options are stay 685 // concrete and require clients to pass in a target like object. The other 686 // option is to make this abstract, and have targets provide concrete 687 // implementations as we do with AsmParser. 688 MCAssembler(MCContext &_Context, TargetAsmBackend &_Backend, 689 MCCodeEmitter &_Emitter, raw_ostream &OS); 690 ~MCAssembler(); 691 692 MCContext &getContext() const { return Context; } 693 694 TargetAsmBackend &getBackend() const { return Backend; } 695 696 MCCodeEmitter &getEmitter() const { return Emitter; } 697 698 /// Finish - Do final processing and write the object to the output stream. 699 void Finish(); 700 701 // FIXME: This does not belong here. 702 bool getSubsectionsViaSymbols() const { 703 return SubsectionsViaSymbols; 704 } 705 void setSubsectionsViaSymbols(bool Value) { 706 SubsectionsViaSymbols = Value; 707 } 708 709 /// @name Section List Access 710 /// @{ 711 712 const SectionDataListType &getSectionList() const { return Sections; } 713 SectionDataListType &getSectionList() { return Sections; } 714 715 iterator begin() { return Sections.begin(); } 716 const_iterator begin() const { return Sections.begin(); } 717 718 iterator end() { return Sections.end(); } 719 const_iterator end() const { return Sections.end(); } 720 721 size_t size() const { return Sections.size(); } 722 723 /// @} 724 /// @name Symbol List Access 725 /// @{ 726 727 const SymbolDataListType &getSymbolList() const { return Symbols; } 728 SymbolDataListType &getSymbolList() { return Symbols; } 729 730 symbol_iterator symbol_begin() { return Symbols.begin(); } 731 const_symbol_iterator symbol_begin() const { return Symbols.begin(); } 732 733 symbol_iterator symbol_end() { return Symbols.end(); } 734 const_symbol_iterator symbol_end() const { return Symbols.end(); } 735 736 size_t symbol_size() const { return Symbols.size(); } 737 738 /// @} 739 /// @name Indirect Symbol List Access 740 /// @{ 741 742 // FIXME: This is a total hack, this should not be here. Once things are 743 // factored so that the streamer has direct access to the .o writer, it can 744 // disappear. 745 std::vector<IndirectSymbolData> &getIndirectSymbols() { 746 return IndirectSymbols; 747 } 748 749 indirect_symbol_iterator indirect_symbol_begin() { 750 return IndirectSymbols.begin(); 751 } 752 const_indirect_symbol_iterator indirect_symbol_begin() const { 753 return IndirectSymbols.begin(); 754 } 755 756 indirect_symbol_iterator indirect_symbol_end() { 757 return IndirectSymbols.end(); 758 } 759 const_indirect_symbol_iterator indirect_symbol_end() const { 760 return IndirectSymbols.end(); 761 } 762 763 size_t indirect_symbol_size() const { return IndirectSymbols.size(); } 764 765 /// @} 766 /// @name Backend Data Access 767 /// @{ 768 769 MCSectionData &getSectionData(const MCSection &Section) const { 770 MCSectionData *Entry = SectionMap.lookup(&Section); 771 assert(Entry && "Missing section data!"); 772 return *Entry; 773 } 774 775 MCSectionData &getOrCreateSectionData(const MCSection &Section, 776 bool *Created = 0) { 777 MCSectionData *&Entry = SectionMap[&Section]; 778 779 if (Created) *Created = !Entry; 780 if (!Entry) 781 Entry = new MCSectionData(Section, this); 782 783 return *Entry; 784 } 785 786 MCSymbolData &getSymbolData(const MCSymbol &Symbol) const { 787 MCSymbolData *Entry = SymbolMap.lookup(&Symbol); 788 assert(Entry && "Missing symbol data!"); 789 return *Entry; 790 } 791 792 MCSymbolData &getOrCreateSymbolData(const MCSymbol &Symbol, 793 bool *Created = 0) { 794 MCSymbolData *&Entry = SymbolMap[&Symbol]; 795 796 if (Created) *Created = !Entry; 797 if (!Entry) 798 Entry = new MCSymbolData(Symbol, 0, 0, this); 799 800 return *Entry; 801 } 802 803 /// @} 804 805 void dump(); 806}; 807 808} // end namespace llvm 809 810#endif 811