MCAssembler.h revision 85f2ecc697a8ca6c8cf08093054cbbb9d2060ccf
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/Support/DataTypes.h" 21#include <vector> // FIXME: Shouldn't be needed. 22 23namespace llvm { 24class raw_ostream; 25class MCAsmLayout; 26class MCAssembler; 27class MCBinaryExpr; 28class MCContext; 29class MCCodeEmitter; 30class MCExpr; 31class MCFragment; 32class MCObjectWriter; 33class MCSection; 34class MCSectionData; 35class MCSymbol; 36class MCSymbolData; 37class MCValue; 38class TargetAsmBackend; 39 40class MCFragment : public ilist_node<MCFragment> { 41 friend class MCAsmLayout; 42 43 MCFragment(const MCFragment&); // DO NOT IMPLEMENT 44 void operator=(const MCFragment&); // DO NOT IMPLEMENT 45 46public: 47 enum FragmentType { 48 FT_Align, 49 FT_Data, 50 FT_Fill, 51 FT_Inst, 52 FT_Org, 53 FT_Dwarf, 54 FT_LEB 55 }; 56 57private: 58 FragmentType Kind; 59 60 /// Parent - The data for the section this fragment is in. 61 MCSectionData *Parent; 62 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(). 66 MCSymbolData *Atom; 67 68 /// @name Assembler Backend Data 69 /// @{ 70 // 71 // FIXME: This could all be kept private to the assembler implementation. 72 73 /// Offset - The offset of this fragment in its section. This is ~0 until 74 /// initialized. 75 uint64_t Offset; 76 77 /// EffectiveSize - The compute size of this section. This is ~0 until 78 /// initialized. 79 uint64_t EffectiveSize; 80 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. 83 unsigned LayoutOrder; 84 85 /// @} 86 87protected: 88 MCFragment(FragmentType _Kind, MCSectionData *_Parent = 0); 89 90public: 91 // Only for sentinel. 92 MCFragment(); 93 virtual ~MCFragment(); 94 95 FragmentType getKind() const { return Kind; } 96 97 MCSectionData *getParent() const { return Parent; } 98 void setParent(MCSectionData *Value) { Parent = Value; } 99 100 MCSymbolData *getAtom() const { return Atom; } 101 void setAtom(MCSymbolData *Value) { Atom = Value; } 102 103 unsigned getLayoutOrder() const { return LayoutOrder; } 104 void setLayoutOrder(unsigned Value) { LayoutOrder = Value; } 105 106 static bool classof(const MCFragment *O) { return true; } 107 108 void dump(); 109}; 110 111class MCDataFragment : public MCFragment { 112 SmallString<32> Contents; 113 114 /// Fixups - The list of fixups in this fragment. 115 std::vector<MCFixup> Fixups; 116 117public: 118 typedef std::vector<MCFixup>::const_iterator const_fixup_iterator; 119 typedef std::vector<MCFixup>::iterator fixup_iterator; 120 121public: 122 MCDataFragment(MCSectionData *SD = 0) : MCFragment(FT_Data, SD) {} 123 124 /// @name Accessors 125 /// @{ 126 127 SmallString<32> &getContents() { return Contents; } 128 const SmallString<32> &getContents() const { return Contents; } 129 130 /// @} 131 /// @name Fixup Access 132 /// @{ 133 134 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); 139 } 140 141 std::vector<MCFixup> &getFixups() { return Fixups; } 142 const std::vector<MCFixup> &getFixups() const { return Fixups; } 143 144 fixup_iterator fixup_begin() { return Fixups.begin(); } 145 const_fixup_iterator fixup_begin() const { return Fixups.begin(); } 146 147 fixup_iterator fixup_end() {return Fixups.end();} 148 const_fixup_iterator fixup_end() const {return Fixups.end();} 149 150 size_t fixup_size() const { return Fixups.size(); } 151 152 /// @} 153 154 static bool classof(const MCFragment *F) { 155 return F->getKind() == MCFragment::FT_Data; 156 } 157 static bool classof(const MCDataFragment *) { return true; } 158}; 159 160// 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. 165class MCInstFragment : public MCFragment { 166 /// Inst - The instruction this is a fragment for. 167 MCInst Inst; 168 169 /// Code - Binary data for the currently encoded instruction. 170 SmallString<8> Code; 171 172 /// Fixups - The list of fixups in this fragment. 173 SmallVector<MCFixup, 1> Fixups; 174 175public: 176 typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator; 177 typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator; 178 179public: 180 MCInstFragment(MCInst _Inst, MCSectionData *SD = 0) 181 : MCFragment(FT_Inst, SD), Inst(_Inst) { 182 } 183 184 /// @name Accessors 185 /// @{ 186 187 SmallVectorImpl<char> &getCode() { return Code; } 188 const SmallVectorImpl<char> &getCode() const { return Code; } 189 190 unsigned getInstSize() const { return Code.size(); } 191 192 MCInst &getInst() { return Inst; } 193 const MCInst &getInst() const { return Inst; } 194 195 void setInst(MCInst Value) { Inst = Value; } 196 197 /// @} 198 /// @name Fixup Access 199 /// @{ 200 201 SmallVectorImpl<MCFixup> &getFixups() { return Fixups; } 202 const SmallVectorImpl<MCFixup> &getFixups() const { return Fixups; } 203 204 fixup_iterator fixup_begin() { return Fixups.begin(); } 205 const_fixup_iterator fixup_begin() const { return Fixups.begin(); } 206 207 fixup_iterator fixup_end() {return Fixups.end();} 208 const_fixup_iterator fixup_end() const {return Fixups.end();} 209 210 size_t fixup_size() const { return Fixups.size(); } 211 212 /// @} 213 214 static bool classof(const MCFragment *F) { 215 return F->getKind() == MCFragment::FT_Inst; 216 } 217 static bool classof(const MCInstFragment *) { return true; } 218}; 219 220class MCAlignFragment : public MCFragment { 221 /// Alignment - The alignment to ensure, in bytes. 222 unsigned Alignment; 223 224 /// Value - Value to use for filling padding bytes. 225 int64_t Value; 226 227 /// ValueSize - The size of the integer (in bytes) of \arg Value. 228 unsigned ValueSize; 229 230 /// 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; 233 234 /// 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. 237 bool EmitNops : 1; 238 239public: 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) {} 245 246 /// @name Accessors 247 /// @{ 248 249 unsigned getAlignment() const { return Alignment; } 250 251 int64_t getValue() const { return Value; } 252 253 unsigned getValueSize() const { return ValueSize; } 254 255 unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; } 256 257 bool hasEmitNops() const { return EmitNops; } 258 void setEmitNops(bool Value) { EmitNops = Value; } 259 260 /// @} 261 262 static bool classof(const MCFragment *F) { 263 return F->getKind() == MCFragment::FT_Align; 264 } 265 static bool classof(const MCAlignFragment *) { return true; } 266}; 267 268class MCFillFragment : public MCFragment { 269 /// Value - Value to use for filling bytes. 270 int64_t Value; 271 272 /// ValueSize - The size (in bytes) of \arg Value to use when filling, or 0 if 273 /// this is a virtual fill fragment. 274 unsigned ValueSize; 275 276 /// Size - The number of bytes to insert. 277 uint64_t Size; 278 279public: 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!"); 286 } 287 288 /// @name Accessors 289 /// @{ 290 291 int64_t getValue() const { return Value; } 292 293 unsigned getValueSize() const { return ValueSize; } 294 295 uint64_t getSize() const { return Size; } 296 297 /// @} 298 299 static bool classof(const MCFragment *F) { 300 return F->getKind() == MCFragment::FT_Fill; 301 } 302 static bool classof(const MCFillFragment *) { return true; } 303}; 304 305class MCOrgFragment : public MCFragment { 306 /// Offset - The offset this fragment should start at. 307 const MCExpr *Offset; 308 309 /// Value - Value to use for filling bytes. 310 int8_t Value; 311 312 /// Size - The current estimate of the size. 313 unsigned Size; 314 315public: 316 MCOrgFragment(const MCExpr &_Offset, int8_t _Value, MCSectionData *SD = 0) 317 : MCFragment(FT_Org, SD), 318 Offset(&_Offset), Value(_Value), Size(0) {} 319 320 /// @name Accessors 321 /// @{ 322 323 const MCExpr &getOffset() const { return *Offset; } 324 325 uint8_t getValue() const { return Value; } 326 327 unsigned getSize() const { return Size; } 328 329 void setSize(unsigned Size_) { Size = Size_; } 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 338class MCLEBFragment : public MCFragment { 339 /// Value - The value this fragment should contain. 340 const MCExpr *Value; 341 342 /// IsSigned - True if this is a sleb128, false if uleb128. 343 bool IsSigned; 344 345 SmallString<8> Contents; 346public: 347 MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSectionData *SD) 348 : MCFragment(FT_LEB, SD), 349 Value(&Value_), IsSigned(IsSigned_) { Contents.push_back(0); } 350 351 /// @name Accessors 352 /// @{ 353 354 const MCExpr &getValue() const { return *Value; } 355 356 bool isSigned() const { return IsSigned; } 357 358 SmallString<8> &getContents() { return Contents; } 359 const SmallString<8> &getContents() const { return Contents; } 360 361 /// @} 362 363 static bool classof(const MCFragment *F) { 364 return F->getKind() == MCFragment::FT_LEB; 365 } 366 static bool classof(const MCLEBFragment *) { return true; } 367}; 368 369class MCDwarfLineAddrFragment : public MCFragment { 370 /// LineDelta - the value of the difference between the two line numbers 371 /// between two .loc dwarf directives. 372 int64_t LineDelta; 373 374 /// 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; 377 378 SmallString<8> Contents; 379 380public: 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); } 385 386 /// @name Accessors 387 /// @{ 388 389 int64_t getLineDelta() const { return LineDelta; } 390 391 const MCExpr &getAddrDelta() const { return *AddrDelta; } 392 393 SmallString<8> &getContents() { return Contents; } 394 const SmallString<8> &getContents() const { return Contents; } 395 396 /// @} 397 398 static bool classof(const MCFragment *F) { 399 return F->getKind() == MCFragment::FT_Dwarf; 400 } 401 static bool classof(const MCDwarfLineAddrFragment *) { return true; } 402}; 403 404// 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. 407class MCSectionData : public ilist_node<MCSectionData> { 408 friend class MCAsmLayout; 409 410 MCSectionData(const MCSectionData&); // DO NOT IMPLEMENT 411 void operator=(const MCSectionData&); // DO NOT IMPLEMENT 412 413public: 414 typedef iplist<MCFragment> FragmentListType; 415 416 typedef FragmentListType::const_iterator const_iterator; 417 typedef FragmentListType::iterator iterator; 418 419 typedef FragmentListType::const_reverse_iterator const_reverse_iterator; 420 typedef FragmentListType::reverse_iterator reverse_iterator; 421 422private: 423 FragmentListType Fragments; 424 const MCSection *Section; 425 426 /// Ordinal - The section index in the assemblers section list. 427 unsigned Ordinal; 428 429 /// LayoutOrder - The index of this section in the layout order. 430 unsigned LayoutOrder; 431 432 /// Alignment - The maximum alignment seen in this section. 433 unsigned Alignment; 434 435 /// @name Assembler Backend Data 436 /// @{ 437 // 438 // FIXME: This could all be kept private to the assembler implementation. 439 440 /// HasInstructions - Whether this section has had instructions emitted into 441 /// it. 442 unsigned HasInstructions : 1; 443 444 /// @} 445 446public: 447 // Only for use as sentinel. 448 MCSectionData(); 449 MCSectionData(const MCSection &Section, MCAssembler *A = 0); 450 451 const MCSection &getSection() const { return *Section; } 452 453 unsigned getAlignment() const { return Alignment; } 454 void setAlignment(unsigned Value) { Alignment = Value; } 455 456 bool hasInstructions() const { return HasInstructions; } 457 void setHasInstructions(bool Value) { HasInstructions = Value; } 458 459 unsigned getOrdinal() const { return Ordinal; } 460 void setOrdinal(unsigned Value) { Ordinal = Value; } 461 462 unsigned getLayoutOrder() const { return LayoutOrder; } 463 void setLayoutOrder(unsigned Value) { LayoutOrder = Value; } 464 465 /// @name Fragment Access 466 /// @{ 467 468 const FragmentListType &getFragmentList() const { return Fragments; } 469 FragmentListType &getFragmentList() { return Fragments; } 470 471 iterator begin() { return Fragments.begin(); } 472 const_iterator begin() const { return Fragments.begin(); } 473 474 iterator end() { return Fragments.end(); } 475 const_iterator end() const { return Fragments.end(); } 476 477 reverse_iterator rbegin() { return Fragments.rbegin(); } 478 const_reverse_iterator rbegin() const { return Fragments.rbegin(); } 479 480 reverse_iterator rend() { return Fragments.rend(); } 481 const_reverse_iterator rend() const { return Fragments.rend(); } 482 483 size_t size() const { return Fragments.size(); } 484 485 bool empty() const { return Fragments.empty(); } 486 487 void dump(); 488 489 /// @} 490}; 491 492// FIXME: Same concerns as with SectionData. 493class MCSymbolData : public ilist_node<MCSymbolData> { 494public: 495 const MCSymbol *Symbol; 496 497 /// Fragment - The fragment this symbol's value is relative to, if any. 498 MCFragment *Fragment; 499 500 /// Offset - The offset to apply to the fragment address to form this symbol's 501 /// value. 502 uint64_t Offset; 503 504 /// IsExternal - True if this symbol is visible outside this translation 505 /// unit. 506 unsigned IsExternal : 1; 507 508 /// IsPrivateExtern - True if this symbol is private extern. 509 unsigned IsPrivateExtern : 1; 510 511 /// CommonSize - The size of the symbol, if it is 'common', or 0. 512 // 513 // FIXME: Pack this in with other fields? We could put it in offset, since a 514 // common symbol can never get a definition. 515 uint64_t CommonSize; 516 517 /// 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; 520 521 /// CommonAlign - The alignment of the symbol, if it is 'common'. 522 // 523 // FIXME: Pack this in with other fields? 524 unsigned CommonAlign; 525 526 /// Flags - The Flags field is used by object file implementations to store 527 /// additional per symbol information which is not easily classified. 528 uint32_t Flags; 529 530 /// Index - Index field, for use by the object file implementation. 531 uint64_t Index; 532 533public: 534 // Only for use as sentinel. 535 MCSymbolData(); 536 MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset, 537 MCAssembler *A = 0); 538 539 /// @name Accessors 540 /// @{ 541 542 const MCSymbol &getSymbol() const { return *Symbol; } 543 544 MCFragment *getFragment() const { return Fragment; } 545 void setFragment(MCFragment *Value) { Fragment = Value; } 546 547 uint64_t getOffset() const { return Offset; } 548 void setOffset(uint64_t Value) { Offset = Value; } 549 550 /// @} 551 /// @name Symbol Attributes 552 /// @{ 553 554 bool isExternal() const { return IsExternal; } 555 void setExternal(bool Value) { IsExternal = Value; } 556 557 bool isPrivateExtern() const { return IsPrivateExtern; } 558 void setPrivateExtern(bool Value) { IsPrivateExtern = Value; } 559 560 /// isCommon - Is this a 'common' symbol. 561 bool isCommon() const { return CommonSize != 0; } 562 563 /// setCommon - Mark this symbol as being 'common'. 564 /// 565 /// \param Size - The size of the symbol. 566 /// \param Align - The alignment of the symbol. 567 void setCommon(uint64_t Size, unsigned Align) { 568 CommonSize = Size; 569 CommonAlign = Align; 570 } 571 572 /// getCommonSize - Return the size of a 'common' symbol. 573 uint64_t getCommonSize() const { 574 assert(isCommon() && "Not a 'common' symbol!"); 575 return CommonSize; 576 } 577 578 void setSize(const MCExpr *SS) { 579 SymbolSize = SS; 580 } 581 582 const MCExpr *getSize() const { 583 return SymbolSize; 584 } 585 586 587 /// getCommonAlignment - Return the alignment of a 'common' symbol. 588 unsigned getCommonAlignment() const { 589 assert(isCommon() && "Not a 'common' symbol!"); 590 return CommonAlign; 591 } 592 593 /// getFlags - Get the (implementation defined) symbol flags. 594 uint32_t getFlags() const { return Flags; } 595 596 /// setFlags - Set the (implementation defined) symbol flags. 597 void setFlags(uint32_t Value) { Flags = Value; } 598 599 /// modifyFlags - Modify the flags via a mask 600 void modifyFlags(uint32_t Value, uint32_t Mask) { 601 Flags = (Flags & ~Mask) | Value; 602 } 603 604 /// getIndex - Get the (implementation defined) index. 605 uint64_t getIndex() const { return Index; } 606 607 /// setIndex - Set the (implementation defined) index. 608 void setIndex(uint64_t Value) { Index = Value; } 609 610 /// @} 611 612 void dump(); 613}; 614 615// FIXME: This really doesn't belong here. See comments below. 616struct IndirectSymbolData { 617 MCSymbol *Symbol; 618 MCSectionData *SectionData; 619}; 620 621class MCAssembler { 622 friend class MCAsmLayout; 623 624public: 625 typedef iplist<MCSectionData> SectionDataListType; 626 typedef iplist<MCSymbolData> SymbolDataListType; 627 628 typedef SectionDataListType::const_iterator const_iterator; 629 typedef SectionDataListType::iterator iterator; 630 631 typedef SymbolDataListType::const_iterator const_symbol_iterator; 632 typedef SymbolDataListType::iterator symbol_iterator; 633 634 typedef std::vector<IndirectSymbolData>::const_iterator 635 const_indirect_symbol_iterator; 636 typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator; 637 638private: 639 MCAssembler(const MCAssembler&); // DO NOT IMPLEMENT 640 void operator=(const MCAssembler&); // DO NOT IMPLEMENT 641 642 MCContext &Context; 643 644 TargetAsmBackend &Backend; 645 646 MCCodeEmitter &Emitter; 647 648 raw_ostream &OS; 649 650 iplist<MCSectionData> Sections; 651 652 iplist<MCSymbolData> Symbols; 653 654 /// The map of sections to their associated assembler backend data. 655 // 656 // FIXME: Avoid this indirection? 657 DenseMap<const MCSection*, MCSectionData*> SectionMap; 658 659 /// The map of symbols to their associated assembler backend data. 660 // 661 // FIXME: Avoid this indirection? 662 DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap; 663 664 std::vector<IndirectSymbolData> IndirectSymbols; 665 666 unsigned RelaxAll : 1; 667 unsigned SubsectionsViaSymbols : 1; 668 669private: 670 /// Evaluate a fixup to a relocatable expression and the value which should be 671 /// placed into the fixup. 672 /// 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 677 /// evaluates to. 678 /// \param Value [out] On return, the value of the fixup as currently layed 679 /// out. 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 682 /// relocation. 683 bool EvaluateFixup(const MCObjectWriter &Writer, const MCAsmLayout &Layout, 684 const MCFixup &Fixup, const MCFragment *DF, 685 MCValue &Target, uint64_t &Value) const; 686 687 /// 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; 692 693 /// Check whether the given fragment needs relaxation. 694 bool FragmentNeedsRelaxation(const MCObjectWriter &Writer, 695 const MCInstFragment *IF, 696 const MCAsmLayout &Layout) const; 697 698 /// 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; 702 703 /// LayoutOnce - Perform one layout iteration and return true if any offsets 704 /// were adjusted. 705 bool LayoutOnce(const MCObjectWriter &Writer, MCAsmLayout &Layout); 706 707 bool RelaxInstruction(const MCObjectWriter &Writer, MCAsmLayout &Layout, 708 MCInstFragment &IF); 709 710 bool RelaxOrg(const MCObjectWriter &Writer, MCAsmLayout &Layout, 711 MCOrgFragment &OF); 712 713 bool RelaxLEB(const MCObjectWriter &Writer, MCAsmLayout &Layout, 714 MCLEBFragment &IF); 715 716 bool RelaxDwarfLineAddr(const MCObjectWriter &Writer, MCAsmLayout &Layout, 717 MCDwarfLineAddrFragment &DF); 718 719 /// FinishLayout - Finalize a layout, including fragment lowering. 720 void FinishLayout(MCAsmLayout &Layout); 721 722 uint64_t HandleFixup(MCObjectWriter &Writer, const MCAsmLayout &Layout, 723 MCFragment &F, const MCFixup &Fixup); 724 725public: 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; 729 730 /// 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; 735 736 /// Emit the section contents using the given object writer. 737 // 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; 741 742public: 743 /// Construct a new assembler instance. 744 /// 745 /// \arg OS - The stream to output to. 746 // 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); 753 ~MCAssembler(); 754 755 MCContext &getContext() const { return Context; } 756 757 TargetAsmBackend &getBackend() const { return Backend; } 758 759 MCCodeEmitter &getEmitter() const { return Emitter; } 760 761 /// 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); 765 766 // FIXME: This does not belong here. 767 bool getSubsectionsViaSymbols() const { 768 return SubsectionsViaSymbols; 769 } 770 void setSubsectionsViaSymbols(bool Value) { 771 SubsectionsViaSymbols = Value; 772 } 773 774 bool getRelaxAll() const { return RelaxAll; } 775 void setRelaxAll(bool Value) { RelaxAll = Value; } 776 777 /// @name Section List Access 778 /// @{ 779 780 const SectionDataListType &getSectionList() const { return Sections; } 781 SectionDataListType &getSectionList() { return Sections; } 782 783 iterator begin() { return Sections.begin(); } 784 const_iterator begin() const { return Sections.begin(); } 785 786 iterator end() { return Sections.end(); } 787 const_iterator end() const { return Sections.end(); } 788 789 size_t size() const { return Sections.size(); } 790 791 /// @} 792 /// @name Symbol List Access 793 /// @{ 794 795 const SymbolDataListType &getSymbolList() const { return Symbols; } 796 SymbolDataListType &getSymbolList() { return Symbols; } 797 798 symbol_iterator symbol_begin() { return Symbols.begin(); } 799 const_symbol_iterator symbol_begin() const { return Symbols.begin(); } 800 801 symbol_iterator symbol_end() { return Symbols.end(); } 802 const_symbol_iterator symbol_end() const { return Symbols.end(); } 803 804 size_t symbol_size() const { return Symbols.size(); } 805 806 /// @} 807 /// @name Indirect Symbol List Access 808 /// @{ 809 810 // 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 812 // disappear. 813 std::vector<IndirectSymbolData> &getIndirectSymbols() { 814 return IndirectSymbols; 815 } 816 817 indirect_symbol_iterator indirect_symbol_begin() { 818 return IndirectSymbols.begin(); 819 } 820 const_indirect_symbol_iterator indirect_symbol_begin() const { 821 return IndirectSymbols.begin(); 822 } 823 824 indirect_symbol_iterator indirect_symbol_end() { 825 return IndirectSymbols.end(); 826 } 827 const_indirect_symbol_iterator indirect_symbol_end() const { 828 return IndirectSymbols.end(); 829 } 830 831 size_t indirect_symbol_size() const { return IndirectSymbols.size(); } 832 833 /// @} 834 /// @name Backend Data Access 835 /// @{ 836 837 MCSectionData &getSectionData(const MCSection &Section) const { 838 MCSectionData *Entry = SectionMap.lookup(&Section); 839 assert(Entry && "Missing section data!"); 840 return *Entry; 841 } 842 843 MCSectionData &getOrCreateSectionData(const MCSection &Section, 844 bool *Created = 0) { 845 MCSectionData *&Entry = SectionMap[&Section]; 846 847 if (Created) *Created = !Entry; 848 if (!Entry) 849 Entry = new MCSectionData(Section, this); 850 851 return *Entry; 852 } 853 854 MCSymbolData &getSymbolData(const MCSymbol &Symbol) const { 855 MCSymbolData *Entry = SymbolMap.lookup(&Symbol); 856 assert(Entry && "Missing symbol data!"); 857 return *Entry; 858 } 859 860 MCSymbolData &getOrCreateSymbolData(const MCSymbol &Symbol, 861 bool *Created = 0) { 862 MCSymbolData *&Entry = SymbolMap[&Symbol]; 863 864 if (Created) *Created = !Entry; 865 if (!Entry) 866 Entry = new MCSymbolData(Symbol, 0, 0, this); 867 868 return *Entry; 869 } 870 871 /// @} 872 873 void dump(); 874}; 875 876} // end namespace llvm 877 878#endif 879