1 //===- MCStreamer.h - High-level Streaming Machine Code Output --*- 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 // This file declares the MCStreamer class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_MC_MCSTREAMER_H 15 #define LLVM_MC_MCSTREAMER_H 16 17 #include "llvm/Support/DataTypes.h" 18 #include "llvm/MC/MCDirectives.h" 19 #include "llvm/MC/MCDwarf.h" 20 #include "llvm/MC/MCWin64EH.h" 21 #include "llvm/ADT/ArrayRef.h" 22 #include "llvm/ADT/SmallVector.h" 23 24 namespace llvm { 25 class MCAsmBackend; 26 class MCAsmInfo; 27 class MCCodeEmitter; 28 class MCContext; 29 class MCExpr; 30 class MCInst; 31 class MCInstPrinter; 32 class MCSection; 33 class MCSymbol; 34 class StringRef; 35 class TargetLoweringObjectFile; 36 class Twine; 37 class raw_ostream; 38 class formatted_raw_ostream; 39 40 /// MCStreamer - Streaming machine code generation interface. This interface 41 /// is intended to provide a programatic interface that is very similar to the 42 /// level that an assembler .s file provides. It has callbacks to emit bytes, 43 /// handle directives, etc. The implementation of this interface retains 44 /// state to know what the current section is etc. 45 /// 46 /// There are multiple implementations of this interface: one for writing out 47 /// a .s file, and implementations that write out .o files of various formats. 48 /// 49 class MCStreamer { 50 MCContext &Context; 51 52 MCStreamer(const MCStreamer&); // DO NOT IMPLEMENT 53 MCStreamer &operator=(const MCStreamer&); // DO NOT IMPLEMENT 54 55 bool EmitEHFrame; 56 bool EmitDebugFrame; 57 58 std::vector<MCDwarfFrameInfo> FrameInfos; 59 MCDwarfFrameInfo *getCurrentFrameInfo(); 60 void EnsureValidFrame(); 61 62 std::vector<MCWin64EHUnwindInfo *> W64UnwindInfos; 63 MCWin64EHUnwindInfo *CurrentW64UnwindInfo; 64 void setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame); 65 void EnsureValidW64UnwindInfo(); 66 67 MCSymbol* LastSymbol; 68 69 /// SectionStack - This is stack of current and previous section 70 /// values saved by PushSection. 71 SmallVector<std::pair<const MCSection *, 72 const MCSection *>, 4> SectionStack; 73 74 unsigned UniqueCodeBeginSuffix; 75 unsigned UniqueDataBeginSuffix; 76 77 protected: 78 /// Indicator of whether the previous data-or-code indicator was for 79 /// code or not. Used to determine when we need to emit a new indicator. 80 enum DataType { 81 Data, 82 Code, 83 JumpTable8, 84 JumpTable16, 85 JumpTable32 86 }; 87 DataType RegionIndicator; 88 89 90 MCStreamer(MCContext &Ctx); 91 92 const MCExpr *BuildSymbolDiff(MCContext &Context, const MCSymbol *A, 93 const MCSymbol *B); 94 95 const MCExpr *ForceExpAbs(const MCExpr* Expr); 96 97 void EmitFrames(bool usingCFI); 98 99 MCWin64EHUnwindInfo *getCurrentW64UnwindInfo(){return CurrentW64UnwindInfo;} 100 void EmitW64Tables(); 101 102 public: 103 virtual ~MCStreamer(); 104 105 MCContext &getContext() const { return Context; } 106 107 unsigned getNumFrameInfos() { 108 return FrameInfos.size(); 109 } 110 111 const MCDwarfFrameInfo &getFrameInfo(unsigned i) { 112 return FrameInfos[i]; 113 } 114 115 ArrayRef<MCDwarfFrameInfo> getFrameInfos() { 116 return FrameInfos; 117 } 118 119 unsigned getNumW64UnwindInfos() { 120 return W64UnwindInfos.size(); 121 } 122 123 MCWin64EHUnwindInfo &getW64UnwindInfo(unsigned i) { 124 return *W64UnwindInfos[i]; 125 } 126 127 /// @name Assembly File Formatting. 128 /// @{ 129 130 /// isVerboseAsm - Return true if this streamer supports verbose assembly 131 /// and if it is enabled. 132 virtual bool isVerboseAsm() const { return false; } 133 134 /// hasRawTextSupport - Return true if this asm streamer supports emitting 135 /// unformatted text to the .s file with EmitRawText. 136 virtual bool hasRawTextSupport() const { return false; } 137 138 /// AddComment - Add a comment that can be emitted to the generated .s 139 /// file if applicable as a QoI issue to make the output of the compiler 140 /// more readable. This only affects the MCAsmStreamer, and only when 141 /// verbose assembly output is enabled. 142 /// 143 /// If the comment includes embedded \n's, they will each get the comment 144 /// prefix as appropriate. The added comment should not end with a \n. 145 virtual void AddComment(const Twine &T) {} 146 147 /// GetCommentOS - Return a raw_ostream that comments can be written to. 148 /// Unlike AddComment, you are required to terminate comments with \n if you 149 /// use this method. 150 virtual raw_ostream &GetCommentOS(); 151 152 /// AddBlankLine - Emit a blank line to a .s file to pretty it up. 153 virtual void AddBlankLine() {} 154 155 /// @} 156 157 /// @name Symbol & Section Management 158 /// @{ 159 160 /// getCurrentSection - Return the current section that the streamer is 161 /// emitting code to. 162 const MCSection *getCurrentSection() const { 163 if (!SectionStack.empty()) 164 return SectionStack.back().first; 165 return NULL; 166 } 167 168 /// getPreviousSection - Return the previous section that the streamer is 169 /// emitting code to. 170 const MCSection *getPreviousSection() const { 171 if (!SectionStack.empty()) 172 return SectionStack.back().second; 173 return NULL; 174 } 175 176 /// ChangeSection - Update streamer for a new active section. 177 /// 178 /// This is called by PopSection and SwitchSection, if the current 179 /// section changes. 180 virtual void ChangeSection(const MCSection *) = 0; 181 182 /// pushSection - Save the current and previous section on the 183 /// section stack. 184 void PushSection() { 185 SectionStack.push_back(std::make_pair(getCurrentSection(), 186 getPreviousSection())); 187 } 188 189 /// popSection - Restore the current and previous section from 190 /// the section stack. Calls ChangeSection as needed. 191 /// 192 /// Returns false if the stack was empty. 193 bool PopSection() { 194 if (SectionStack.size() <= 1) 195 return false; 196 const MCSection *oldSection = SectionStack.pop_back_val().first; 197 const MCSection *curSection = SectionStack.back().first; 198 199 if (oldSection != curSection) 200 ChangeSection(curSection); 201 return true; 202 } 203 204 /// SwitchSection - Set the current section where code is being emitted to 205 /// @p Section. This is required to update CurSection. 206 /// 207 /// This corresponds to assembler directives like .section, .text, etc. 208 void SwitchSection(const MCSection *Section) { 209 assert(Section && "Cannot switch to a null section!"); 210 const MCSection *curSection = SectionStack.back().first; 211 SectionStack.back().second = curSection; 212 if (Section != curSection) { 213 SectionStack.back().first = Section; 214 ChangeSection(Section); 215 } 216 } 217 218 /// SwitchSectionNoChange - Set the current section where code is being 219 /// emitted to @p Section. This is required to update CurSection. This 220 /// version does not call ChangeSection. 221 void SwitchSectionNoChange(const MCSection *Section) { 222 assert(Section && "Cannot switch to a null section!"); 223 const MCSection *curSection = SectionStack.back().first; 224 SectionStack.back().second = curSection; 225 if (Section != curSection) 226 SectionStack.back().first = Section; 227 } 228 229 /// InitSections - Create the default sections and set the initial one. 230 virtual void InitSections() = 0; 231 232 /// EmitLabel - Emit a label for @p Symbol into the current section. 233 /// 234 /// This corresponds to an assembler statement such as: 235 /// foo: 236 /// 237 /// @param Symbol - The symbol to emit. A given symbol should only be 238 /// emitted as a label once, and symbols emitted as a label should never be 239 /// used in an assignment. 240 virtual void EmitLabel(MCSymbol *Symbol); 241 242 /// EmitDataRegion - Emit a label that marks the beginning of a data 243 /// region. 244 /// On ELF targets, this corresponds to an assembler statement such as: 245 /// $d.1: 246 virtual void EmitDataRegion(); 247 248 /// EmitJumpTable8Region - Emit a label that marks the beginning of a 249 /// jump table composed of 8-bit offsets. 250 /// On ELF targets, this corresponds to an assembler statement such as: 251 /// $d.1: 252 virtual void EmitJumpTable8Region(); 253 254 /// EmitJumpTable16Region - Emit a label that marks the beginning of a 255 /// jump table composed of 16-bit offsets. 256 /// On ELF targets, this corresponds to an assembler statement such as: 257 /// $d.1: 258 virtual void EmitJumpTable16Region(); 259 260 /// EmitJumpTable32Region - Emit a label that marks the beginning of a 261 /// jump table composed of 32-bit offsets. 262 /// On ELF targets, this corresponds to an assembler statement such as: 263 /// $d.1: 264 virtual void EmitJumpTable32Region(); 265 266 /// EmitCodeRegion - Emit a label that marks the beginning of a code 267 /// region. 268 /// On ELF targets, this corresponds to an assembler statement such as: 269 /// $a.1: 270 virtual void EmitCodeRegion(); 271 272 /// ForceCodeRegion - Forcibly sets the current region mode to code. Used 273 /// at function entry points. 274 void ForceCodeRegion() { RegionIndicator = Code; } 275 276 277 virtual void EmitEHSymAttributes(const MCSymbol *Symbol, 278 MCSymbol *EHSymbol); 279 280 /// EmitAssemblerFlag - Note in the output the specified @p Flag 281 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) = 0; 282 283 /// EmitThumbFunc - Note in the output that the specified @p Func is 284 /// a Thumb mode function (ARM target only). 285 virtual void EmitThumbFunc(MCSymbol *Func) = 0; 286 287 /// EmitAssignment - Emit an assignment of @p Value to @p Symbol. 288 /// 289 /// This corresponds to an assembler statement such as: 290 /// symbol = value 291 /// 292 /// The assignment generates no code, but has the side effect of binding the 293 /// value in the current context. For the assembly streamer, this prints the 294 /// binding into the .s file. 295 /// 296 /// @param Symbol - The symbol being assigned to. 297 /// @param Value - The value for the symbol. 298 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) = 0; 299 300 /// EmitWeakReference - Emit an weak reference from @p Alias to @p Symbol. 301 /// 302 /// This corresponds to an assembler statement such as: 303 /// .weakref alias, symbol 304 /// 305 /// @param Alias - The alias that is being created. 306 /// @param Symbol - The symbol being aliased. 307 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) = 0; 308 309 /// EmitSymbolAttribute - Add the given @p Attribute to @p Symbol. 310 virtual void EmitSymbolAttribute(MCSymbol *Symbol, 311 MCSymbolAttr Attribute) = 0; 312 313 /// EmitSymbolDesc - Set the @p DescValue for the @p Symbol. 314 /// 315 /// @param Symbol - The symbol to have its n_desc field set. 316 /// @param DescValue - The value to set into the n_desc field. 317 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) = 0; 318 319 /// BeginCOFFSymbolDef - Start emitting COFF symbol definition 320 /// 321 /// @param Symbol - The symbol to have its External & Type fields set. 322 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) = 0; 323 324 /// EmitCOFFSymbolStorageClass - Emit the storage class of the symbol. 325 /// 326 /// @param StorageClass - The storage class the symbol should have. 327 virtual void EmitCOFFSymbolStorageClass(int StorageClass) = 0; 328 329 /// EmitCOFFSymbolType - Emit the type of the symbol. 330 /// 331 /// @param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h) 332 virtual void EmitCOFFSymbolType(int Type) = 0; 333 334 /// EndCOFFSymbolDef - Marks the end of the symbol definition. 335 virtual void EndCOFFSymbolDef() = 0; 336 337 /// EmitELFSize - Emit an ELF .size directive. 338 /// 339 /// This corresponds to an assembler statement such as: 340 /// .size symbol, expression 341 /// 342 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) = 0; 343 344 /// EmitCommonSymbol - Emit a common symbol. 345 /// 346 /// @param Symbol - The common symbol to emit. 347 /// @param Size - The size of the common symbol. 348 /// @param ByteAlignment - The alignment of the symbol if 349 /// non-zero. This must be a power of 2. 350 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, 351 unsigned ByteAlignment) = 0; 352 353 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol. 354 /// 355 /// @param Symbol - The common symbol to emit. 356 /// @param Size - The size of the common symbol. 357 /// @param ByteAlignment - The alignment of the common symbol in bytes. 358 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, 359 unsigned ByteAlignment) = 0; 360 361 /// EmitZerofill - Emit the zerofill section and an optional symbol. 362 /// 363 /// @param Section - The zerofill section to create and or to put the symbol 364 /// @param Symbol - The zerofill symbol to emit, if non-NULL. 365 /// @param Size - The size of the zerofill symbol. 366 /// @param ByteAlignment - The alignment of the zerofill symbol if 367 /// non-zero. This must be a power of 2 on some targets. 368 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0, 369 unsigned Size = 0,unsigned ByteAlignment = 0) = 0; 370 371 /// EmitTBSSSymbol - Emit a thread local bss (.tbss) symbol. 372 /// 373 /// @param Section - The thread local common section. 374 /// @param Symbol - The thread local common symbol to emit. 375 /// @param Size - The size of the symbol. 376 /// @param ByteAlignment - The alignment of the thread local common symbol 377 /// if non-zero. This must be a power of 2 on some targets. 378 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, 379 uint64_t Size, unsigned ByteAlignment = 0) = 0; 380 381 /// @} 382 /// @name Generating Data 383 /// @{ 384 385 /// EmitBytes - Emit the bytes in \arg Data into the output. 386 /// 387 /// This is used to implement assembler directives such as .byte, .ascii, 388 /// etc. 389 virtual void EmitBytes(StringRef Data, unsigned AddrSpace) = 0; 390 391 /// EmitValue - Emit the expression @p Value into the output as a native 392 /// integer of the given @p Size bytes. 393 /// 394 /// This is used to implement assembler directives such as .word, .quad, 395 /// etc. 396 /// 397 /// @param Value - The value to emit. 398 /// @param Size - The size of the integer (in bytes) to emit. This must 399 /// match a native machine width. 400 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size, 401 unsigned AddrSpace) = 0; 402 403 void EmitValue(const MCExpr *Value, unsigned Size, unsigned AddrSpace = 0); 404 405 /// EmitIntValue - Special case of EmitValue that avoids the client having 406 /// to pass in a MCExpr for constant integers. 407 virtual void EmitIntValue(uint64_t Value, unsigned Size, 408 unsigned AddrSpace = 0); 409 410 /// EmitAbsValue - Emit the Value, but try to avoid relocations. On MachO 411 /// this is done by producing 412 /// foo = value 413 /// .long foo 414 void EmitAbsValue(const MCExpr *Value, unsigned Size, 415 unsigned AddrSpace = 0); 416 417 virtual void EmitULEB128Value(const MCExpr *Value) = 0; 418 419 virtual void EmitSLEB128Value(const MCExpr *Value) = 0; 420 421 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the 422 /// client having to pass in a MCExpr for constant integers. 423 void EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace = 0); 424 425 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the 426 /// client having to pass in a MCExpr for constant integers. 427 void EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace = 0); 428 429 /// EmitSymbolValue - Special case of EmitValue that avoids the client 430 /// having to pass in a MCExpr for MCSymbols. 431 void EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 432 unsigned AddrSpace = 0); 433 434 /// EmitGPRel32Value - Emit the expression @p Value into the output as a 435 /// gprel32 (32-bit GP relative) value. 436 /// 437 /// This is used to implement assembler directives such as .gprel32 on 438 /// targets that support them. 439 virtual void EmitGPRel32Value(const MCExpr *Value); 440 441 /// EmitFill - Emit NumBytes bytes worth of the value specified by 442 /// FillValue. This implements directives such as '.space'. 443 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue, 444 unsigned AddrSpace); 445 446 /// EmitZeros - Emit NumBytes worth of zeros. This is a convenience 447 /// function that just wraps EmitFill. 448 void EmitZeros(uint64_t NumBytes, unsigned AddrSpace) { 449 EmitFill(NumBytes, 0, AddrSpace); 450 } 451 452 453 /// EmitValueToAlignment - Emit some number of copies of @p Value until 454 /// the byte alignment @p ByteAlignment is reached. 455 /// 456 /// If the number of bytes need to emit for the alignment is not a multiple 457 /// of @p ValueSize, then the contents of the emitted fill bytes is 458 /// undefined. 459 /// 460 /// This used to implement the .align assembler directive. 461 /// 462 /// @param ByteAlignment - The alignment to reach. This must be a power of 463 /// two on some targets. 464 /// @param Value - The value to use when filling bytes. 465 /// @param ValueSize - The size of the integer (in bytes) to emit for 466 /// @p Value. This must match a native machine width. 467 /// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If 468 /// the alignment cannot be reached in this many bytes, no bytes are 469 /// emitted. 470 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0, 471 unsigned ValueSize = 1, 472 unsigned MaxBytesToEmit = 0) = 0; 473 474 /// EmitCodeAlignment - Emit nops until the byte alignment @p ByteAlignment 475 /// is reached. 476 /// 477 /// This used to align code where the alignment bytes may be executed. This 478 /// can emit different bytes for different sizes to optimize execution. 479 /// 480 /// @param ByteAlignment - The alignment to reach. This must be a power of 481 /// two on some targets. 482 /// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If 483 /// the alignment cannot be reached in this many bytes, no bytes are 484 /// emitted. 485 virtual void EmitCodeAlignment(unsigned ByteAlignment, 486 unsigned MaxBytesToEmit = 0) = 0; 487 488 /// EmitValueToOffset - Emit some number of copies of @p Value until the 489 /// byte offset @p Offset is reached. 490 /// 491 /// This is used to implement assembler directives such as .org. 492 /// 493 /// @param Offset - The offset to reach. This may be an expression, but the 494 /// expression must be associated with the current section. 495 /// @param Value - The value to use when filling bytes. 496 virtual void EmitValueToOffset(const MCExpr *Offset, 497 unsigned char Value = 0) = 0; 498 499 /// @} 500 501 /// EmitFileDirective - Switch to a new logical file. This is used to 502 /// implement the '.file "foo.c"' assembler directive. 503 virtual void EmitFileDirective(StringRef Filename) = 0; 504 505 /// EmitDwarfFileDirective - Associate a filename with a specified logical 506 /// file number. This implements the DWARF2 '.file 4 "foo.c"' assembler 507 /// directive. 508 virtual bool EmitDwarfFileDirective(unsigned FileNo,StringRef Filename); 509 510 /// EmitDwarfLocDirective - This implements the DWARF2 511 // '.loc fileno lineno ...' assembler directive. 512 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 513 unsigned Column, unsigned Flags, 514 unsigned Isa, 515 unsigned Discriminator, 516 StringRef FileName); 517 518 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta, 519 const MCSymbol *LastLabel, 520 const MCSymbol *Label, 521 unsigned PointerSize) = 0; 522 523 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel, 524 const MCSymbol *Label) { 525 } 526 527 void EmitDwarfSetLineAddr(int64_t LineDelta, const MCSymbol *Label, 528 int PointerSize); 529 530 virtual void EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding); 531 virtual void EmitCFISections(bool EH, bool Debug); 532 virtual void EmitCFIStartProc(); 533 virtual void EmitCFIEndProc(); 534 virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset); 535 virtual void EmitCFIDefCfaOffset(int64_t Offset); 536 virtual void EmitCFIDefCfaRegister(int64_t Register); 537 virtual void EmitCFIOffset(int64_t Register, int64_t Offset); 538 virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding); 539 virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding); 540 virtual void EmitCFIRememberState(); 541 virtual void EmitCFIRestoreState(); 542 virtual void EmitCFISameValue(int64_t Register); 543 virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset); 544 virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment); 545 546 virtual void EmitWin64EHStartProc(const MCSymbol *Symbol); 547 virtual void EmitWin64EHEndProc(); 548 virtual void EmitWin64EHStartChained(); 549 virtual void EmitWin64EHEndChained(); 550 virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind, 551 bool Except); 552 virtual void EmitWin64EHHandlerData(); 553 virtual void EmitWin64EHPushReg(unsigned Register); 554 virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset); 555 virtual void EmitWin64EHAllocStack(unsigned Size); 556 virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset); 557 virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset); 558 virtual void EmitWin64EHPushFrame(bool Code); 559 virtual void EmitWin64EHEndProlog(); 560 561 /// EmitInstruction - Emit the given @p Instruction into the current 562 /// section. 563 virtual void EmitInstruction(const MCInst &Inst) = 0; 564 565 /// EmitRawText - If this file is backed by a assembly streamer, this dumps 566 /// the specified string in the output .s file. This capability is 567 /// indicated by the hasRawTextSupport() predicate. By default this aborts. 568 virtual void EmitRawText(StringRef String); 569 void EmitRawText(const Twine &String); 570 571 /// ARM-related methods. 572 /// FIXME: Eventually we should have some "target MC streamer" and move 573 /// these methods there. 574 virtual void EmitFnStart(); 575 virtual void EmitFnEnd(); 576 virtual void EmitCantUnwind(); 577 virtual void EmitPersonality(const MCSymbol *Personality); 578 virtual void EmitHandlerData(); 579 virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0); 580 virtual void EmitPad(int64_t Offset); 581 virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, 582 bool isVector); 583 584 /// Finish - Finish emission of machine code. 585 virtual void Finish() = 0; 586 }; 587 588 /// createNullStreamer - Create a dummy machine code streamer, which does 589 /// nothing. This is useful for timing the assembler front end. 590 MCStreamer *createNullStreamer(MCContext &Ctx); 591 592 /// createAsmStreamer - Create a machine code streamer which will print out 593 /// assembly for the native target, suitable for compiling with a native 594 /// assembler. 595 /// 596 /// \param InstPrint - If given, the instruction printer to use. If not given 597 /// the MCInst representation will be printed. This method takes ownership of 598 /// InstPrint. 599 /// 600 /// \param CE - If given, a code emitter to use to show the instruction 601 /// encoding inline with the assembly. This method takes ownership of \arg CE. 602 /// 603 /// \param TAB - If given, a target asm backend to use to show the fixup 604 /// information in conjunction with encoding information. This method takes 605 /// ownership of \arg TAB. 606 /// 607 /// \param ShowInst - Whether to show the MCInst representation inline with 608 /// the assembly. 609 /// 610 /// \param DecodeLSDA - If true, emit comments that translates the LSDA into a 611 /// human readable format. Only usable with CFI. 612 MCStreamer *createAsmStreamer(MCContext &Ctx, formatted_raw_ostream &OS, 613 bool isVerboseAsm, 614 bool useLoc, 615 bool useCFI, 616 MCInstPrinter *InstPrint = 0, 617 MCCodeEmitter *CE = 0, 618 MCAsmBackend *TAB = 0, 619 bool ShowInst = false); 620 621 /// createMachOStreamer - Create a machine code streamer which will generate 622 /// Mach-O format object files. 623 /// 624 /// Takes ownership of \arg TAB and \arg CE. 625 MCStreamer *createMachOStreamer(MCContext &Ctx, MCAsmBackend &TAB, 626 raw_ostream &OS, MCCodeEmitter *CE, 627 bool RelaxAll = false); 628 629 /// createWinCOFFStreamer - Create a machine code streamer which will 630 /// generate Microsoft COFF format object files. 631 /// 632 /// Takes ownership of \arg TAB and \arg CE. 633 MCStreamer *createWinCOFFStreamer(MCContext &Ctx, 634 MCAsmBackend &TAB, 635 MCCodeEmitter &CE, raw_ostream &OS, 636 bool RelaxAll = false); 637 638 /// createELFStreamer - Create a machine code streamer which will generate 639 /// ELF format object files. 640 MCStreamer *createELFStreamer(MCContext &Ctx, MCAsmBackend &TAB, 641 raw_ostream &OS, MCCodeEmitter *CE, 642 bool RelaxAll, bool NoExecStack); 643 644 /// createLoggingStreamer - Create a machine code streamer which just logs the 645 /// API calls and then dispatches to another streamer. 646 /// 647 /// The new streamer takes ownership of the \arg Child. 648 MCStreamer *createLoggingStreamer(MCStreamer *Child, raw_ostream &OS); 649 650 /// createPureStreamer - Create a machine code streamer which will generate 651 /// "pure" MC object files, for use with MC-JIT and testing tools. 652 /// 653 /// Takes ownership of \arg TAB and \arg CE. 654 MCStreamer *createPureStreamer(MCContext &Ctx, MCAsmBackend &TAB, 655 raw_ostream &OS, MCCodeEmitter *CE); 656 657 } // end namespace llvm 658 659 #endif 660
