MCStreamer.h revision 410ef2b263e92d3de1b2acff7437059400daed7d
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/ADT/SmallVector.h" 18#include "llvm/Support/DataTypes.h" 19#include "llvm/MC/MCDirectives.h" 20#include "llvm/MC/MCDwarf.h" 21#include "llvm/MC/MCWin64EH.h" 22 23namespace llvm { 24 class MCAsmInfo; 25 class MCCodeEmitter; 26 class MCContext; 27 class MCExpr; 28 class MCInst; 29 class MCInstPrinter; 30 class MCSection; 31 class MCSymbol; 32 class StringRef; 33 class TargetAsmBackend; 34 class TargetLoweringObjectFile; 35 class Twine; 36 class raw_ostream; 37 class formatted_raw_ostream; 38 39 /// MCStreamer - Streaming machine code generation interface. This interface 40 /// is intended to provide a programatic interface that is very similar to the 41 /// level that an assembler .s file provides. It has callbacks to emit bytes, 42 /// handle directives, etc. The implementation of this interface retains 43 /// state to know what the current section is etc. 44 /// 45 /// There are multiple implementations of this interface: one for writing out 46 /// a .s file, and implementations that write out .o files of various formats. 47 /// 48 class MCStreamer { 49 MCContext &Context; 50 51 MCStreamer(const MCStreamer&); // DO NOT IMPLEMENT 52 MCStreamer &operator=(const MCStreamer&); // DO NOT IMPLEMENT 53 54 bool EmitEHFrame; 55 bool EmitDebugFrame; 56 57 std::vector<MCDwarfFrameInfo> FrameInfos; 58 MCDwarfFrameInfo *getCurrentFrameInfo(); 59 void EnsureValidFrame(); 60 61 std::vector<MCWin64EHUnwindInfo> W64UnwindInfos; 62 MCWin64EHUnwindInfo *CurrentW64UnwindInfo; 63 void setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame); 64 void EnsureValidW64UnwindInfo(); 65 66 const MCSymbol* LastNonPrivate; 67 68 /// SectionStack - This is stack of current and previous section 69 /// values saved by PushSection. 70 SmallVector<std::pair<const MCSection *, 71 const MCSection *>, 4> SectionStack; 72 73 protected: 74 MCStreamer(MCContext &Ctx); 75 76 const MCExpr *BuildSymbolDiff(MCContext &Context, const MCSymbol *A, 77 const MCSymbol *B); 78 79 const MCExpr *ForceExpAbs(const MCExpr* Expr); 80 81 void EmitFrames(bool usingCFI); 82 83 MCWin64EHUnwindInfo *getCurrentW64UnwindInfo(){return CurrentW64UnwindInfo;} 84 void EmitW64Tables(); 85 86 public: 87 virtual ~MCStreamer(); 88 89 MCContext &getContext() const { return Context; } 90 91 unsigned getNumFrameInfos() { 92 return FrameInfos.size(); 93 } 94 95 const MCDwarfFrameInfo &getFrameInfo(unsigned i) { 96 return FrameInfos[i]; 97 } 98 99 unsigned getNumW64UnwindInfos() { 100 return W64UnwindInfos.size(); 101 } 102 103 MCWin64EHUnwindInfo &getW64UnwindInfo(unsigned i) { 104 return W64UnwindInfos[i]; 105 } 106 107 /// @name Assembly File Formatting. 108 /// @{ 109 110 /// isVerboseAsm - Return true if this streamer supports verbose assembly 111 /// and if it is enabled. 112 virtual bool isVerboseAsm() const { return false; } 113 114 /// hasRawTextSupport - Return true if this asm streamer supports emitting 115 /// unformatted text to the .s file with EmitRawText. 116 virtual bool hasRawTextSupport() const { return false; } 117 118 /// AddComment - Add a comment that can be emitted to the generated .s 119 /// file if applicable as a QoI issue to make the output of the compiler 120 /// more readable. This only affects the MCAsmStreamer, and only when 121 /// verbose assembly output is enabled. 122 /// 123 /// If the comment includes embedded \n's, they will each get the comment 124 /// prefix as appropriate. The added comment should not end with a \n. 125 virtual void AddComment(const Twine &T) {} 126 127 /// GetCommentOS - Return a raw_ostream that comments can be written to. 128 /// Unlike AddComment, you are required to terminate comments with \n if you 129 /// use this method. 130 virtual raw_ostream &GetCommentOS(); 131 132 /// AddBlankLine - Emit a blank line to a .s file to pretty it up. 133 virtual void AddBlankLine() {} 134 135 /// @} 136 137 /// @name Symbol & Section Management 138 /// @{ 139 140 /// getCurrentSection - Return the current section that the streamer is 141 /// emitting code to. 142 const MCSection *getCurrentSection() const { 143 if (!SectionStack.empty()) 144 return SectionStack.back().first; 145 return NULL; 146 } 147 148 /// getPreviousSection - Return the previous section that the streamer is 149 /// emitting code to. 150 const MCSection *getPreviousSection() const { 151 if (!SectionStack.empty()) 152 return SectionStack.back().second; 153 return NULL; 154 } 155 156 /// ChangeSection - Update streamer for a new active section. 157 /// 158 /// This is called by PopSection and SwitchSection, if the current 159 /// section changes. 160 virtual void ChangeSection(const MCSection *) = 0; 161 162 /// pushSection - Save the current and previous section on the 163 /// section stack. 164 void PushSection() { 165 SectionStack.push_back(std::make_pair(getCurrentSection(), 166 getPreviousSection())); 167 } 168 169 /// popSection - Restore the current and previous section from 170 /// the section stack. Calls ChangeSection as needed. 171 /// 172 /// Returns false if the stack was empty. 173 bool PopSection() { 174 if (SectionStack.size() <= 1) 175 return false; 176 const MCSection *oldSection = SectionStack.pop_back_val().first; 177 const MCSection *curSection = SectionStack.back().first; 178 179 if (oldSection != curSection) 180 ChangeSection(curSection); 181 return true; 182 } 183 184 /// SwitchSection - Set the current section where code is being emitted to 185 /// @p Section. This is required to update CurSection. 186 /// 187 /// This corresponds to assembler directives like .section, .text, etc. 188 void SwitchSection(const MCSection *Section) { 189 assert(Section && "Cannot switch to a null section!"); 190 const MCSection *curSection = SectionStack.back().first; 191 SectionStack.back().second = curSection; 192 if (Section != curSection) { 193 SectionStack.back().first = Section; 194 ChangeSection(Section); 195 } 196 } 197 198 /// SwitchSectionNoChange - Set the current section where code is being 199 /// emitted to @p Section. This is required to update CurSection. This 200 /// version does not call ChangeSection. 201 void SwitchSectionNoChange(const MCSection *Section) { 202 assert(Section && "Cannot switch to a null section!"); 203 const MCSection *curSection = SectionStack.back().first; 204 SectionStack.back().second = curSection; 205 if (Section != curSection) 206 SectionStack.back().first = Section; 207 } 208 209 /// InitSections - Create the default sections and set the initial one. 210 virtual void InitSections() = 0; 211 212 /// EmitLabel - Emit a label for @p Symbol into the current section. 213 /// 214 /// This corresponds to an assembler statement such as: 215 /// foo: 216 /// 217 /// @param Symbol - The symbol to emit. A given symbol should only be 218 /// emitted as a label once, and symbols emitted as a label should never be 219 /// used in an assignment. 220 virtual void EmitLabel(MCSymbol *Symbol); 221 222 virtual void EmitEHSymAttributes(const MCSymbol *Symbol, 223 MCSymbol *EHSymbol); 224 225 /// EmitAssemblerFlag - Note in the output the specified @p Flag 226 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) = 0; 227 228 /// EmitThumbFunc - Note in the output that the specified @p Func is 229 /// a Thumb mode function (ARM target only). 230 virtual void EmitThumbFunc(MCSymbol *Func) = 0; 231 232 /// EmitAssignment - Emit an assignment of @p Value to @p Symbol. 233 /// 234 /// This corresponds to an assembler statement such as: 235 /// symbol = value 236 /// 237 /// The assignment generates no code, but has the side effect of binding the 238 /// value in the current context. For the assembly streamer, this prints the 239 /// binding into the .s file. 240 /// 241 /// @param Symbol - The symbol being assigned to. 242 /// @param Value - The value for the symbol. 243 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) = 0; 244 245 /// EmitWeakReference - Emit an weak reference from @p Alias to @p Symbol. 246 /// 247 /// This corresponds to an assembler statement such as: 248 /// .weakref alias, symbol 249 /// 250 /// @param Alias - The alias that is being created. 251 /// @param Symbol - The symbol being aliased. 252 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) = 0; 253 254 /// EmitSymbolAttribute - Add the given @p Attribute to @p Symbol. 255 virtual void EmitSymbolAttribute(MCSymbol *Symbol, 256 MCSymbolAttr Attribute) = 0; 257 258 /// EmitSymbolDesc - Set the @p DescValue for the @p Symbol. 259 /// 260 /// @param Symbol - The symbol to have its n_desc field set. 261 /// @param DescValue - The value to set into the n_desc field. 262 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) = 0; 263 264 /// BeginCOFFSymbolDef - Start emitting COFF symbol definition 265 /// 266 /// @param Symbol - The symbol to have its External & Type fields set. 267 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) = 0; 268 269 /// EmitCOFFSymbolStorageClass - Emit the storage class of the symbol. 270 /// 271 /// @param StorageClass - The storage class the symbol should have. 272 virtual void EmitCOFFSymbolStorageClass(int StorageClass) = 0; 273 274 /// EmitCOFFSymbolType - Emit the type of the symbol. 275 /// 276 /// @param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h) 277 virtual void EmitCOFFSymbolType(int Type) = 0; 278 279 /// EndCOFFSymbolDef - Marks the end of the symbol definition. 280 virtual void EndCOFFSymbolDef() = 0; 281 282 /// EmitELFSize - Emit an ELF .size directive. 283 /// 284 /// This corresponds to an assembler statement such as: 285 /// .size symbol, expression 286 /// 287 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) = 0; 288 289 /// EmitCommonSymbol - Emit a common symbol. 290 /// 291 /// @param Symbol - The common symbol to emit. 292 /// @param Size - The size of the common symbol. 293 /// @param ByteAlignment - The alignment of the symbol if 294 /// non-zero. This must be a power of 2. 295 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, 296 unsigned ByteAlignment) = 0; 297 298 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol. 299 /// 300 /// @param Symbol - The common symbol to emit. 301 /// @param Size - The size of the common symbol. 302 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) = 0; 303 304 /// EmitZerofill - Emit the zerofill section and an optional symbol. 305 /// 306 /// @param Section - The zerofill section to create and or to put the symbol 307 /// @param Symbol - The zerofill symbol to emit, if non-NULL. 308 /// @param Size - The size of the zerofill symbol. 309 /// @param ByteAlignment - The alignment of the zerofill symbol if 310 /// non-zero. This must be a power of 2 on some targets. 311 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0, 312 unsigned Size = 0,unsigned ByteAlignment = 0) = 0; 313 314 /// EmitTBSSSymbol - Emit a thread local bss (.tbss) symbol. 315 /// 316 /// @param Section - The thread local common section. 317 /// @param Symbol - The thread local common symbol to emit. 318 /// @param Size - The size of the symbol. 319 /// @param ByteAlignment - The alignment of the thread local common symbol 320 /// if non-zero. This must be a power of 2 on some targets. 321 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, 322 uint64_t Size, unsigned ByteAlignment = 0) = 0; 323 324 /// @} 325 /// @name Generating Data 326 /// @{ 327 328 /// EmitBytes - Emit the bytes in \arg Data into the output. 329 /// 330 /// This is used to implement assembler directives such as .byte, .ascii, 331 /// etc. 332 virtual void EmitBytes(StringRef Data, unsigned AddrSpace) = 0; 333 334 /// EmitValue - Emit the expression @p Value into the output as a native 335 /// integer of the given @p Size bytes. 336 /// 337 /// This is used to implement assembler directives such as .word, .quad, 338 /// etc. 339 /// 340 /// @param Value - The value to emit. 341 /// @param Size - The size of the integer (in bytes) to emit. This must 342 /// match a native machine width. 343 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size, 344 unsigned AddrSpace) = 0; 345 346 void EmitValue(const MCExpr *Value, unsigned Size, unsigned AddrSpace = 0); 347 348 /// EmitIntValue - Special case of EmitValue that avoids the client having 349 /// to pass in a MCExpr for constant integers. 350 virtual void EmitIntValue(uint64_t Value, unsigned Size, 351 unsigned AddrSpace = 0); 352 353 /// EmitAbsValue - Emit the Value, but try to avoid relocations. On MachO 354 /// this is done by producing 355 /// foo = value 356 /// .long foo 357 void EmitAbsValue(const MCExpr *Value, unsigned Size, 358 unsigned AddrSpace = 0); 359 360 virtual void EmitULEB128Value(const MCExpr *Value) = 0; 361 362 virtual void EmitSLEB128Value(const MCExpr *Value) = 0; 363 364 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the 365 /// client having to pass in a MCExpr for constant integers. 366 void EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace = 0); 367 368 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the 369 /// client having to pass in a MCExpr for constant integers. 370 void EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace = 0); 371 372 /// EmitSymbolValue - Special case of EmitValue that avoids the client 373 /// having to pass in a MCExpr for MCSymbols. 374 void EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 375 unsigned AddrSpace = 0); 376 377 /// EmitGPRel32Value - Emit the expression @p Value into the output as a 378 /// gprel32 (32-bit GP relative) value. 379 /// 380 /// This is used to implement assembler directives such as .gprel32 on 381 /// targets that support them. 382 virtual void EmitGPRel32Value(const MCExpr *Value); 383 384 /// EmitFill - Emit NumBytes bytes worth of the value specified by 385 /// FillValue. This implements directives such as '.space'. 386 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue, 387 unsigned AddrSpace); 388 389 /// EmitZeros - Emit NumBytes worth of zeros. This is a convenience 390 /// function that just wraps EmitFill. 391 void EmitZeros(uint64_t NumBytes, unsigned AddrSpace) { 392 EmitFill(NumBytes, 0, AddrSpace); 393 } 394 395 396 /// EmitValueToAlignment - Emit some number of copies of @p Value until 397 /// the byte alignment @p ByteAlignment is reached. 398 /// 399 /// If the number of bytes need to emit for the alignment is not a multiple 400 /// of @p ValueSize, then the contents of the emitted fill bytes is 401 /// undefined. 402 /// 403 /// This used to implement the .align assembler directive. 404 /// 405 /// @param ByteAlignment - The alignment to reach. This must be a power of 406 /// two on some targets. 407 /// @param Value - The value to use when filling bytes. 408 /// @param ValueSize - The size of the integer (in bytes) to emit for 409 /// @p Value. This must match a native machine width. 410 /// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If 411 /// the alignment cannot be reached in this many bytes, no bytes are 412 /// emitted. 413 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0, 414 unsigned ValueSize = 1, 415 unsigned MaxBytesToEmit = 0) = 0; 416 417 /// EmitCodeAlignment - Emit nops until the byte alignment @p ByteAlignment 418 /// is reached. 419 /// 420 /// This used to align code where the alignment bytes may be executed. This 421 /// can emit different bytes for different sizes to optimize execution. 422 /// 423 /// @param ByteAlignment - The alignment to reach. This must be a power of 424 /// two on some targets. 425 /// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If 426 /// the alignment cannot be reached in this many bytes, no bytes are 427 /// emitted. 428 virtual void EmitCodeAlignment(unsigned ByteAlignment, 429 unsigned MaxBytesToEmit = 0) = 0; 430 431 /// EmitValueToOffset - Emit some number of copies of @p Value until the 432 /// byte offset @p Offset is reached. 433 /// 434 /// This is used to implement assembler directives such as .org. 435 /// 436 /// @param Offset - The offset to reach. This may be an expression, but the 437 /// expression must be associated with the current section. 438 /// @param Value - The value to use when filling bytes. 439 virtual void EmitValueToOffset(const MCExpr *Offset, 440 unsigned char Value = 0) = 0; 441 442 /// @} 443 444 /// EmitFileDirective - Switch to a new logical file. This is used to 445 /// implement the '.file "foo.c"' assembler directive. 446 virtual void EmitFileDirective(StringRef Filename) = 0; 447 448 /// EmitDwarfFileDirective - Associate a filename with a specified logical 449 /// file number. This implements the DWARF2 '.file 4 "foo.c"' assembler 450 /// directive. 451 virtual bool EmitDwarfFileDirective(unsigned FileNo,StringRef Filename); 452 453 /// EmitDwarfLocDirective - This implements the DWARF2 454 // '.loc fileno lineno ...' assembler directive. 455 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 456 unsigned Column, unsigned Flags, 457 unsigned Isa, 458 unsigned Discriminator, 459 StringRef FileName); 460 461 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta, 462 const MCSymbol *LastLabel, 463 const MCSymbol *Label) = 0; 464 465 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel, 466 const MCSymbol *Label) { 467 } 468 469 void EmitDwarfSetLineAddr(int64_t LineDelta, const MCSymbol *Label, 470 int PointerSize); 471 472 virtual void EmitCFISections(bool EH, bool Debug); 473 virtual void EmitCFIStartProc(); 474 virtual void EmitCFIEndProc(); 475 virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset); 476 virtual void EmitCFIDefCfaOffset(int64_t Offset); 477 virtual void EmitCFIDefCfaRegister(int64_t Register); 478 virtual void EmitCFIOffset(int64_t Register, int64_t Offset); 479 virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding); 480 virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding); 481 virtual void EmitCFIRememberState(); 482 virtual void EmitCFIRestoreState(); 483 virtual void EmitCFISameValue(int64_t Register); 484 virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset); 485 virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment); 486 487 virtual void EmitWin64EHStartProc(const MCSymbol *Symbol); 488 virtual void EmitWin64EHEndProc(); 489 virtual void EmitWin64EHStartChained(); 490 virtual void EmitWin64EHEndChained(); 491 virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind, 492 bool Except); 493 virtual void EmitWin64EHHandlerData(); 494 virtual void EmitWin64EHPushReg(unsigned Register); 495 virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset); 496 virtual void EmitWin64EHAllocStack(unsigned Size); 497 virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset); 498 virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset); 499 virtual void EmitWin64EHPushFrame(bool Code); 500 virtual void EmitWin64EHEndProlog(); 501 502 /// EmitInstruction - Emit the given @p Instruction into the current 503 /// section. 504 virtual void EmitInstruction(const MCInst &Inst) = 0; 505 506 /// EmitRawText - If this file is backed by a assembly streamer, this dumps 507 /// the specified string in the output .s file. This capability is 508 /// indicated by the hasRawTextSupport() predicate. By default this aborts. 509 virtual void EmitRawText(StringRef String); 510 void EmitRawText(const Twine &String); 511 512 /// ARM-related methods. 513 /// FIXME: Eventually we should have some "target MC streamer" and move 514 /// these methods there. 515 virtual void EmitFnStart(); 516 virtual void EmitFnEnd(); 517 virtual void EmitCantUnwind(); 518 virtual void EmitPersonality(const MCSymbol *Personality); 519 virtual void EmitHandlerData(); 520 virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0); 521 virtual void EmitPad(int64_t Offset); 522 virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, 523 bool isVector); 524 525 /// Finish - Finish emission of machine code. 526 virtual void Finish() = 0; 527 }; 528 529 /// createNullStreamer - Create a dummy machine code streamer, which does 530 /// nothing. This is useful for timing the assembler front end. 531 MCStreamer *createNullStreamer(MCContext &Ctx); 532 533 /// createAsmStreamer - Create a machine code streamer which will print out 534 /// assembly for the native target, suitable for compiling with a native 535 /// assembler. 536 /// 537 /// \param InstPrint - If given, the instruction printer to use. If not given 538 /// the MCInst representation will be printed. This method takes ownership of 539 /// InstPrint. 540 /// 541 /// \param CE - If given, a code emitter to use to show the instruction 542 /// encoding inline with the assembly. This method takes ownership of \arg CE. 543 /// 544 /// \param TAB - If given, a target asm backend to use to show the fixup 545 /// information in conjunction with encoding information. This method takes 546 /// ownership of \arg TAB. 547 /// 548 /// \param ShowInst - Whether to show the MCInst representation inline with 549 /// the assembly. 550 MCStreamer *createAsmStreamer(MCContext &Ctx, formatted_raw_ostream &OS, 551 bool isVerboseAsm, 552 bool useLoc, 553 bool useCFI, 554 MCInstPrinter *InstPrint = 0, 555 MCCodeEmitter *CE = 0, 556 TargetAsmBackend *TAB = 0, 557 bool ShowInst = false); 558 559 /// createMachOStreamer - Create a machine code streamer which will generate 560 /// Mach-O format object files. 561 /// 562 /// Takes ownership of \arg TAB and \arg CE. 563 MCStreamer *createMachOStreamer(MCContext &Ctx, TargetAsmBackend &TAB, 564 raw_ostream &OS, MCCodeEmitter *CE, 565 bool RelaxAll = false); 566 567 /// createWinCOFFStreamer - Create a machine code streamer which will 568 /// generate Microsoft COFF format object files. 569 /// 570 /// Takes ownership of \arg TAB and \arg CE. 571 MCStreamer *createWinCOFFStreamer(MCContext &Ctx, 572 TargetAsmBackend &TAB, 573 MCCodeEmitter &CE, raw_ostream &OS, 574 bool RelaxAll = false); 575 576 /// createELFStreamer - Create a machine code streamer which will generate 577 /// ELF format object files. 578 MCStreamer *createELFStreamer(MCContext &Ctx, TargetAsmBackend &TAB, 579 raw_ostream &OS, MCCodeEmitter *CE, 580 bool RelaxAll, bool NoExecStack); 581 582 /// createLoggingStreamer - Create a machine code streamer which just logs the 583 /// API calls and then dispatches to another streamer. 584 /// 585 /// The new streamer takes ownership of the \arg Child. 586 MCStreamer *createLoggingStreamer(MCStreamer *Child, raw_ostream &OS); 587 588 /// createPureStreamer - Create a machine code streamer which will generate 589 /// "pure" MC object files, for use with MC-JIT and testing tools. 590 /// 591 /// Takes ownership of \arg TAB and \arg CE. 592 MCStreamer *createPureStreamer(MCContext &Ctx, TargetAsmBackend &TAB, 593 raw_ostream &OS, MCCodeEmitter *CE); 594 595} // end namespace llvm 596 597#endif 598