MCAssembler.h revision 1f6efa3996dd1929fbc129203ce5009b620e6969
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; 238 239 /// OnlyAlignAddress - Flag to indicate that this align is only used to adjust 240 /// the address space size of a section and that it should not be included as 241 /// part of the section size. This flag can only be used on the last fragment 242 /// in a section. 243 bool OnlyAlignAddress : 1; 244 245public: 246 MCAlignFragment(unsigned _Alignment, int64_t _Value, unsigned _ValueSize, 247 unsigned _MaxBytesToEmit, MCSectionData *SD = 0) 248 : MCFragment(FT_Align, SD), Alignment(_Alignment), 249 Value(_Value),ValueSize(_ValueSize), 250 MaxBytesToEmit(_MaxBytesToEmit), EmitNops(false), 251 OnlyAlignAddress(false) {} 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 bool hasEmitNops() const { return EmitNops; } 265 void setEmitNops(bool Value) { EmitNops = Value; } 266 267 bool hasOnlyAlignAddress() const { return OnlyAlignAddress; } 268 void setOnlyAlignAddress(bool Value) { OnlyAlignAddress = Value; } 269 270 /// @} 271 272 static bool classof(const MCFragment *F) { 273 return F->getKind() == MCFragment::FT_Align; 274 } 275 static bool classof(const MCAlignFragment *) { return true; } 276}; 277 278class MCFillFragment : public MCFragment { 279 /// Value - Value to use for filling bytes. 280 int64_t Value; 281 282 /// ValueSize - The size (in bytes) of \arg Value to use when filling, or 0 if 283 /// this is a virtual fill fragment. 284 unsigned ValueSize; 285 286 /// Size - The number of bytes to insert. 287 uint64_t Size; 288 289public: 290 MCFillFragment(int64_t _Value, unsigned _ValueSize, uint64_t _Size, 291 MCSectionData *SD = 0) 292 : MCFragment(FT_Fill, SD), 293 Value(_Value), ValueSize(_ValueSize), Size(_Size) { 294 assert((!ValueSize || (Size % ValueSize) == 0) && 295 "Fill size must be a multiple of the value size!"); 296 } 297 298 /// @name Accessors 299 /// @{ 300 301 int64_t getValue() const { return Value; } 302 303 unsigned getValueSize() const { return ValueSize; } 304 305 uint64_t getSize() const { return Size; } 306 307 /// @} 308 309 static bool classof(const MCFragment *F) { 310 return F->getKind() == MCFragment::FT_Fill; 311 } 312 static bool classof(const MCFillFragment *) { return true; } 313}; 314 315class MCOrgFragment : public MCFragment { 316 /// Offset - The offset this fragment should start at. 317 const MCExpr *Offset; 318 319 /// Value - Value to use for filling bytes. 320 int8_t Value; 321 322 /// Size - The current estimate of the size. 323 unsigned Size; 324 325public: 326 MCOrgFragment(const MCExpr &_Offset, int8_t _Value, MCSectionData *SD = 0) 327 : MCFragment(FT_Org, SD), 328 Offset(&_Offset), Value(_Value), Size(0) {} 329 330 /// @name Accessors 331 /// @{ 332 333 const MCExpr &getOffset() const { return *Offset; } 334 335 uint8_t getValue() const { return Value; } 336 337 unsigned getSize() const { return Size; } 338 339 void setSize(unsigned Size_) { Size = Size_; } 340 /// @} 341 342 static bool classof(const MCFragment *F) { 343 return F->getKind() == MCFragment::FT_Org; 344 } 345 static bool classof(const MCOrgFragment *) { return true; } 346}; 347 348class MCLEBFragment : public MCFragment { 349 /// Value - The value this fragment should contain. 350 const MCExpr *Value; 351 352 /// IsSigned - True if this is a sleb128, false if uleb128. 353 bool IsSigned; 354 355 /// Size - The current size estimate. 356 uint64_t Size; 357 358public: 359 MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSectionData *SD) 360 : MCFragment(FT_LEB, SD), 361 Value(&Value_), IsSigned(IsSigned_), Size(1) {} 362 363 /// @name Accessors 364 /// @{ 365 366 const MCExpr &getValue() const { return *Value; } 367 368 bool isSigned() const { return IsSigned; } 369 370 uint64_t getSize() const { return Size; } 371 372 void setSize(uint64_t Size_) { Size = Size_; } 373 374 /// @} 375 376 static bool classof(const MCFragment *F) { 377 return F->getKind() == MCFragment::FT_LEB; 378 } 379 static bool classof(const MCLEBFragment *) { return true; } 380}; 381 382class MCDwarfLineAddrFragment : public MCFragment { 383 /// LineDelta - the value of the difference between the two line numbers 384 /// between two .loc dwarf directives. 385 int64_t LineDelta; 386 387 /// AddrDelta - The expression for the difference of the two symbols that 388 /// make up the address delta between two .loc dwarf directives. 389 const MCExpr *AddrDelta; 390 391 /// Size - The current size estimate. 392 uint64_t Size; 393 394public: 395 MCDwarfLineAddrFragment(int64_t _LineDelta, const MCExpr &_AddrDelta, 396 MCSectionData *SD = 0) 397 : MCFragment(FT_Dwarf, SD), 398 LineDelta(_LineDelta), AddrDelta(&_AddrDelta), Size(1) {} 399 400 /// @name Accessors 401 /// @{ 402 403 int64_t getLineDelta() const { return LineDelta; } 404 405 const MCExpr &getAddrDelta() const { return *AddrDelta; } 406 407 uint64_t getSize() const { return Size; } 408 409 void setSize(uint64_t Size_) { Size = Size_; } 410 411 /// @} 412 413 static bool classof(const MCFragment *F) { 414 return F->getKind() == MCFragment::FT_Dwarf; 415 } 416 static bool classof(const MCDwarfLineAddrFragment *) { return true; } 417}; 418 419// FIXME: Should this be a separate class, or just merged into MCSection? Since 420// we anticipate the fast path being through an MCAssembler, the only reason to 421// keep it out is for API abstraction. 422class MCSectionData : public ilist_node<MCSectionData> { 423 friend class MCAsmLayout; 424 425 MCSectionData(const MCSectionData&); // DO NOT IMPLEMENT 426 void operator=(const MCSectionData&); // DO NOT IMPLEMENT 427 428public: 429 typedef iplist<MCFragment> FragmentListType; 430 431 typedef FragmentListType::const_iterator const_iterator; 432 typedef FragmentListType::iterator iterator; 433 434 typedef FragmentListType::const_reverse_iterator const_reverse_iterator; 435 typedef FragmentListType::reverse_iterator reverse_iterator; 436 437private: 438 FragmentListType Fragments; 439 const MCSection *Section; 440 441 /// Ordinal - The section index in the assemblers section list. 442 unsigned Ordinal; 443 444 /// LayoutOrder - The index of this section in the layout order. 445 unsigned LayoutOrder; 446 447 /// Alignment - The maximum alignment seen in this section. 448 unsigned Alignment; 449 450 /// @name Assembler Backend Data 451 /// @{ 452 // 453 // FIXME: This could all be kept private to the assembler implementation. 454 455 /// Address - The computed address of this section. This is ~0 until 456 /// initialized. 457 uint64_t Address; 458 459 /// HasInstructions - Whether this section has had instructions emitted into 460 /// it. 461 unsigned HasInstructions : 1; 462 463 /// @} 464 465public: 466 // Only for use as sentinel. 467 MCSectionData(); 468 MCSectionData(const MCSection &Section, MCAssembler *A = 0); 469 470 const MCSection &getSection() const { return *Section; } 471 472 unsigned getAlignment() const { return Alignment; } 473 void setAlignment(unsigned Value) { Alignment = Value; } 474 475 bool hasInstructions() const { return HasInstructions; } 476 void setHasInstructions(bool Value) { HasInstructions = Value; } 477 478 unsigned getOrdinal() const { return Ordinal; } 479 void setOrdinal(unsigned Value) { Ordinal = Value; } 480 481 unsigned getLayoutOrder() const { return LayoutOrder; } 482 void setLayoutOrder(unsigned Value) { LayoutOrder = Value; } 483 484 /// @name Fragment Access 485 /// @{ 486 487 const FragmentListType &getFragmentList() const { return Fragments; } 488 FragmentListType &getFragmentList() { return Fragments; } 489 490 iterator begin() { return Fragments.begin(); } 491 const_iterator begin() const { return Fragments.begin(); } 492 493 iterator end() { return Fragments.end(); } 494 const_iterator end() const { return Fragments.end(); } 495 496 reverse_iterator rbegin() { return Fragments.rbegin(); } 497 const_reverse_iterator rbegin() const { return Fragments.rbegin(); } 498 499 reverse_iterator rend() { return Fragments.rend(); } 500 const_reverse_iterator rend() const { return Fragments.rend(); } 501 502 size_t size() const { return Fragments.size(); } 503 504 bool empty() const { return Fragments.empty(); } 505 506 void dump(); 507 508 /// @} 509}; 510 511// FIXME: Same concerns as with SectionData. 512class MCSymbolData : public ilist_node<MCSymbolData> { 513public: 514 const MCSymbol *Symbol; 515 516 /// Fragment - The fragment this symbol's value is relative to, if any. 517 MCFragment *Fragment; 518 519 /// Offset - The offset to apply to the fragment address to form this symbol's 520 /// value. 521 uint64_t Offset; 522 523 /// IsExternal - True if this symbol is visible outside this translation 524 /// unit. 525 unsigned IsExternal : 1; 526 527 /// IsPrivateExtern - True if this symbol is private extern. 528 unsigned IsPrivateExtern : 1; 529 530 /// CommonSize - The size of the symbol, if it is 'common', or 0. 531 // 532 // FIXME: Pack this in with other fields? We could put it in offset, since a 533 // common symbol can never get a definition. 534 uint64_t CommonSize; 535 536 /// SymbolSize - An expression describing how to calculate the size of 537 /// a symbol. If a symbol has no size this field will be NULL. 538 const MCExpr *SymbolSize; 539 540 /// CommonAlign - The alignment of the symbol, if it is 'common'. 541 // 542 // FIXME: Pack this in with other fields? 543 unsigned CommonAlign; 544 545 /// Flags - The Flags field is used by object file implementations to store 546 /// additional per symbol information which is not easily classified. 547 uint32_t Flags; 548 549 /// Index - Index field, for use by the object file implementation. 550 uint64_t Index; 551 552public: 553 // Only for use as sentinel. 554 MCSymbolData(); 555 MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment, uint64_t _Offset, 556 MCAssembler *A = 0); 557 558 /// @name Accessors 559 /// @{ 560 561 const MCSymbol &getSymbol() const { return *Symbol; } 562 563 MCFragment *getFragment() const { return Fragment; } 564 void setFragment(MCFragment *Value) { Fragment = Value; } 565 566 uint64_t getOffset() const { return Offset; } 567 void setOffset(uint64_t Value) { Offset = Value; } 568 569 /// @} 570 /// @name Symbol Attributes 571 /// @{ 572 573 bool isExternal() const { return IsExternal; } 574 void setExternal(bool Value) { IsExternal = Value; } 575 576 bool isPrivateExtern() const { return IsPrivateExtern; } 577 void setPrivateExtern(bool Value) { IsPrivateExtern = Value; } 578 579 /// isCommon - Is this a 'common' symbol. 580 bool isCommon() const { return CommonSize != 0; } 581 582 /// setCommon - Mark this symbol as being 'common'. 583 /// 584 /// \param Size - The size of the symbol. 585 /// \param Align - The alignment of the symbol. 586 void setCommon(uint64_t Size, unsigned Align) { 587 CommonSize = Size; 588 CommonAlign = Align; 589 } 590 591 /// getCommonSize - Return the size of a 'common' symbol. 592 uint64_t getCommonSize() const { 593 assert(isCommon() && "Not a 'common' symbol!"); 594 return CommonSize; 595 } 596 597 void setSize(const MCExpr *SS) { 598 SymbolSize = SS; 599 } 600 601 const MCExpr *getSize() const { 602 return SymbolSize; 603 } 604 605 606 /// getCommonAlignment - Return the alignment of a 'common' symbol. 607 unsigned getCommonAlignment() const { 608 assert(isCommon() && "Not a 'common' symbol!"); 609 return CommonAlign; 610 } 611 612 /// getFlags - Get the (implementation defined) symbol flags. 613 uint32_t getFlags() const { return Flags; } 614 615 /// setFlags - Set the (implementation defined) symbol flags. 616 void setFlags(uint32_t Value) { Flags = Value; } 617 618 /// modifyFlags - Modify the flags via a mask 619 void modifyFlags(uint32_t Value, uint32_t Mask) { 620 Flags = (Flags & ~Mask) | Value; 621 } 622 623 /// getIndex - Get the (implementation defined) index. 624 uint64_t getIndex() const { return Index; } 625 626 /// setIndex - Set the (implementation defined) index. 627 void setIndex(uint64_t Value) { Index = Value; } 628 629 /// @} 630 631 void dump(); 632}; 633 634// FIXME: This really doesn't belong here. See comments below. 635struct IndirectSymbolData { 636 MCSymbol *Symbol; 637 MCSectionData *SectionData; 638}; 639 640class MCAssembler { 641 friend class MCAsmLayout; 642 643public: 644 typedef iplist<MCSectionData> SectionDataListType; 645 typedef iplist<MCSymbolData> SymbolDataListType; 646 647 typedef SectionDataListType::const_iterator const_iterator; 648 typedef SectionDataListType::iterator iterator; 649 650 typedef SymbolDataListType::const_iterator const_symbol_iterator; 651 typedef SymbolDataListType::iterator symbol_iterator; 652 653 typedef std::vector<IndirectSymbolData>::const_iterator 654 const_indirect_symbol_iterator; 655 typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator; 656 657private: 658 MCAssembler(const MCAssembler&); // DO NOT IMPLEMENT 659 void operator=(const MCAssembler&); // DO NOT IMPLEMENT 660 661 MCContext &Context; 662 663 TargetAsmBackend &Backend; 664 665 MCCodeEmitter &Emitter; 666 667 raw_ostream &OS; 668 669 iplist<MCSectionData> Sections; 670 671 iplist<MCSymbolData> Symbols; 672 673 /// The map of sections to their associated assembler backend data. 674 // 675 // FIXME: Avoid this indirection? 676 DenseMap<const MCSection*, MCSectionData*> SectionMap; 677 678 /// The map of symbols to their associated assembler backend data. 679 // 680 // FIXME: Avoid this indirection? 681 DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap; 682 683 std::vector<IndirectSymbolData> IndirectSymbols; 684 685 unsigned RelaxAll : 1; 686 unsigned SubsectionsViaSymbols : 1; 687 unsigned PadSectionToAlignment : 1; 688 689private: 690 /// Evaluate a fixup to a relocatable expression and the value which should be 691 /// placed into the fixup. 692 /// 693 /// \param Layout The layout to use for evaluation. 694 /// \param Fixup The fixup to evaluate. 695 /// \param DF The fragment the fixup is inside. 696 /// \param Target [out] On return, the relocatable expression the fixup 697 /// evaluates to. 698 /// \param Value [out] On return, the value of the fixup as currently layed 699 /// out. 700 /// \return Whether the fixup value was fully resolved. This is true if the 701 /// \arg Value result is fixed, otherwise the value may change due to 702 /// relocation. 703 bool EvaluateFixup(const MCObjectWriter &Writer, const MCAsmLayout &Layout, 704 const MCFixup &Fixup, const MCFragment *DF, 705 MCValue &Target, uint64_t &Value) const; 706 707 /// Check whether a fixup can be satisfied, or whether it needs to be relaxed 708 /// (increased in size, in order to hold its value correctly). 709 bool FixupNeedsRelaxation(const MCObjectWriter &Writer, 710 const MCFixup &Fixup, const MCFragment *DF, 711 const MCAsmLayout &Layout) const; 712 713 /// Check whether the given fragment needs relaxation. 714 bool FragmentNeedsRelaxation(const MCObjectWriter &Writer, 715 const MCInstFragment *IF, 716 const MCAsmLayout &Layout) const; 717 718 /// Compute the effective fragment size assuming it is layed out at the given 719 /// \arg SectionAddress and \arg FragmentOffset. 720 uint64_t ComputeFragmentSize(MCAsmLayout &Layout, const MCFragment &F, 721 uint64_t SectionAddress, 722 uint64_t FragmentOffset) const; 723 724 /// LayoutOnce - Perform one layout iteration and return true if any offsets 725 /// were adjusted. 726 bool LayoutOnce(const MCObjectWriter &Writer, MCAsmLayout &Layout); 727 728 bool RelaxInstruction(const MCObjectWriter &Writer, MCAsmLayout &Layout, 729 MCInstFragment &IF); 730 731 bool RelaxOrg(const MCObjectWriter &Writer, MCAsmLayout &Layout, 732 MCOrgFragment &OF); 733 734 bool RelaxLEB(const MCObjectWriter &Writer, MCAsmLayout &Layout, 735 MCLEBFragment &IF); 736 737 bool RelaxDwarfLineAddr(const MCObjectWriter &Writer, MCAsmLayout &Layout, 738 MCDwarfLineAddrFragment &DF); 739 740 /// FinishLayout - Finalize a layout, including fragment lowering. 741 void FinishLayout(MCAsmLayout &Layout); 742 743public: 744 /// Find the symbol which defines the atom containing the given symbol, or 745 /// null if there is no such symbol. 746 const MCSymbolData *getAtom(const MCSymbolData *Symbol) const; 747 748 /// Check whether a particular symbol is visible to the linker and is required 749 /// in the symbol table, or whether it can be discarded by the assembler. This 750 /// also effects whether the assembler treats the label as potentially 751 /// defining a separate atom. 752 bool isSymbolLinkerVisible(const MCSymbol &SD) const; 753 754 /// Emit the section contents using the given object writer. 755 // 756 // FIXME: Should MCAssembler always have a reference to the object writer? 757 void WriteSectionData(const MCSectionData *Section, const MCAsmLayout &Layout, 758 MCObjectWriter *OW) const; 759 760 void AddSectionToTheEnd(const MCObjectWriter &Writer, MCSectionData &SD, 761 MCAsmLayout &Layout); 762 763public: 764 /// Construct a new assembler instance. 765 /// 766 /// \arg OS - The stream to output to. 767 // 768 // FIXME: How are we going to parameterize this? Two obvious options are stay 769 // concrete and require clients to pass in a target like object. The other 770 // option is to make this abstract, and have targets provide concrete 771 // implementations as we do with AsmParser. 772 MCAssembler(MCContext &_Context, TargetAsmBackend &_Backend, 773 MCCodeEmitter &_Emitter, bool _PadSectionToAlignment, 774 raw_ostream &OS); 775 ~MCAssembler(); 776 777 MCContext &getContext() const { return Context; } 778 779 TargetAsmBackend &getBackend() const { return Backend; } 780 781 MCCodeEmitter &getEmitter() const { return Emitter; } 782 783 /// Finish - Do final processing and write the object to the output stream. 784 /// \arg Writer is used for custom object writer (as the MCJIT does), 785 /// if not specified it is automatically created from backend. 786 void Finish(MCObjectWriter *Writer = 0); 787 788 // FIXME: This does not belong here. 789 bool getSubsectionsViaSymbols() const { 790 return SubsectionsViaSymbols; 791 } 792 void setSubsectionsViaSymbols(bool Value) { 793 SubsectionsViaSymbols = Value; 794 } 795 796 bool getRelaxAll() const { return RelaxAll; } 797 void setRelaxAll(bool Value) { RelaxAll = Value; } 798 799 /// @name Section List Access 800 /// @{ 801 802 const SectionDataListType &getSectionList() const { return Sections; } 803 SectionDataListType &getSectionList() { return Sections; } 804 805 iterator begin() { return Sections.begin(); } 806 const_iterator begin() const { return Sections.begin(); } 807 808 iterator end() { return Sections.end(); } 809 const_iterator end() const { return Sections.end(); } 810 811 size_t size() const { return Sections.size(); } 812 813 /// @} 814 /// @name Symbol List Access 815 /// @{ 816 817 const SymbolDataListType &getSymbolList() const { return Symbols; } 818 SymbolDataListType &getSymbolList() { return Symbols; } 819 820 symbol_iterator symbol_begin() { return Symbols.begin(); } 821 const_symbol_iterator symbol_begin() const { return Symbols.begin(); } 822 823 symbol_iterator symbol_end() { return Symbols.end(); } 824 const_symbol_iterator symbol_end() const { return Symbols.end(); } 825 826 size_t symbol_size() const { return Symbols.size(); } 827 828 /// @} 829 /// @name Indirect Symbol List Access 830 /// @{ 831 832 // FIXME: This is a total hack, this should not be here. Once things are 833 // factored so that the streamer has direct access to the .o writer, it can 834 // disappear. 835 std::vector<IndirectSymbolData> &getIndirectSymbols() { 836 return IndirectSymbols; 837 } 838 839 indirect_symbol_iterator indirect_symbol_begin() { 840 return IndirectSymbols.begin(); 841 } 842 const_indirect_symbol_iterator indirect_symbol_begin() const { 843 return IndirectSymbols.begin(); 844 } 845 846 indirect_symbol_iterator indirect_symbol_end() { 847 return IndirectSymbols.end(); 848 } 849 const_indirect_symbol_iterator indirect_symbol_end() const { 850 return IndirectSymbols.end(); 851 } 852 853 size_t indirect_symbol_size() const { return IndirectSymbols.size(); } 854 855 /// @} 856 /// @name Backend Data Access 857 /// @{ 858 859 MCSectionData &getSectionData(const MCSection &Section) const { 860 MCSectionData *Entry = SectionMap.lookup(&Section); 861 assert(Entry && "Missing section data!"); 862 return *Entry; 863 } 864 865 MCSectionData &getOrCreateSectionData(const MCSection &Section, 866 bool *Created = 0) { 867 MCSectionData *&Entry = SectionMap[&Section]; 868 869 if (Created) *Created = !Entry; 870 if (!Entry) 871 Entry = new MCSectionData(Section, this); 872 873 return *Entry; 874 } 875 876 MCSymbolData &getSymbolData(const MCSymbol &Symbol) const { 877 MCSymbolData *Entry = SymbolMap.lookup(&Symbol); 878 assert(Entry && "Missing symbol data!"); 879 return *Entry; 880 } 881 882 MCSymbolData &getOrCreateSymbolData(const MCSymbol &Symbol, 883 bool *Created = 0) { 884 MCSymbolData *&Entry = SymbolMap[&Symbol]; 885 886 if (Created) *Created = !Entry; 887 if (!Entry) 888 Entry = new MCSymbolData(Symbol, 0, 0, this); 889 890 return *Entry; 891 } 892 893 /// @} 894 895 void dump(); 896}; 897 898} // end namespace llvm 899 900#endif 901