MCStreamer.h revision 3185f5c35322cbd10040ab20f265042d477efe62
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 85 public: 86 virtual ~MCStreamer(); 87 88 MCContext &getContext() const { return Context; } 89 90 unsigned getNumFrameInfos() { 91 return FrameInfos.size(); 92 } 93 94 const MCDwarfFrameInfo &getFrameInfo(unsigned i) { 95 return FrameInfos[i]; 96 } 97 98 /// @name Assembly File Formatting. 99 /// @{ 100 101 /// isVerboseAsm - Return true if this streamer supports verbose assembly 102 /// and if it is enabled. 103 virtual bool isVerboseAsm() const { return false; } 104 105 /// hasRawTextSupport - Return true if this asm streamer supports emitting 106 /// unformatted text to the .s file with EmitRawText. 107 virtual bool hasRawTextSupport() const { return false; } 108 109 /// AddComment - Add a comment that can be emitted to the generated .s 110 /// file if applicable as a QoI issue to make the output of the compiler 111 /// more readable. This only affects the MCAsmStreamer, and only when 112 /// verbose assembly output is enabled. 113 /// 114 /// If the comment includes embedded \n's, they will each get the comment 115 /// prefix as appropriate. The added comment should not end with a \n. 116 virtual void AddComment(const Twine &T) {} 117 118 /// GetCommentOS - Return a raw_ostream that comments can be written to. 119 /// Unlike AddComment, you are required to terminate comments with \n if you 120 /// use this method. 121 virtual raw_ostream &GetCommentOS(); 122 123 /// AddBlankLine - Emit a blank line to a .s file to pretty it up. 124 virtual void AddBlankLine() {} 125 126 /// @} 127 128 /// @name Symbol & Section Management 129 /// @{ 130 131 /// getCurrentSection - Return the current section that the streamer is 132 /// emitting code to. 133 const MCSection *getCurrentSection() const { 134 if (!SectionStack.empty()) 135 return SectionStack.back().first; 136 return NULL; 137 } 138 139 /// getPreviousSection - Return the previous section that the streamer is 140 /// emitting code to. 141 const MCSection *getPreviousSection() const { 142 if (!SectionStack.empty()) 143 return SectionStack.back().second; 144 return NULL; 145 } 146 147 /// ChangeSection - Update streamer for a new active section. 148 /// 149 /// This is called by PopSection and SwitchSection, if the current 150 /// section changes. 151 virtual void ChangeSection(const MCSection *) = 0; 152 153 /// pushSection - Save the current and previous section on the 154 /// section stack. 155 void PushSection() { 156 SectionStack.push_back(std::make_pair(getCurrentSection(), 157 getPreviousSection())); 158 } 159 160 /// popSection - Restore the current and previous section from 161 /// the section stack. Calls ChangeSection as needed. 162 /// 163 /// Returns false if the stack was empty. 164 bool PopSection() { 165 if (SectionStack.size() <= 1) 166 return false; 167 const MCSection *oldSection = SectionStack.pop_back_val().first; 168 const MCSection *curSection = SectionStack.back().first; 169 170 if (oldSection != curSection) 171 ChangeSection(curSection); 172 return true; 173 } 174 175 /// SwitchSection - Set the current section where code is being emitted to 176 /// @p Section. This is required to update CurSection. 177 /// 178 /// This corresponds to assembler directives like .section, .text, etc. 179 void SwitchSection(const MCSection *Section) { 180 assert(Section && "Cannot switch to a null section!"); 181 const MCSection *curSection = SectionStack.back().first; 182 SectionStack.back().second = curSection; 183 if (Section != curSection) { 184 SectionStack.back().first = Section; 185 ChangeSection(Section); 186 } 187 } 188 189 /// InitSections - Create the default sections and set the initial one. 190 virtual void InitSections() = 0; 191 192 /// EmitLabel - Emit a label for @p Symbol into the current section. 193 /// 194 /// This corresponds to an assembler statement such as: 195 /// foo: 196 /// 197 /// @param Symbol - The symbol to emit. A given symbol should only be 198 /// emitted as a label once, and symbols emitted as a label should never be 199 /// used in an assignment. 200 virtual void EmitLabel(MCSymbol *Symbol); 201 202 virtual void EmitEHSymAttributes(const MCSymbol *Symbol, 203 MCSymbol *EHSymbol); 204 205 /// EmitAssemblerFlag - Note in the output the specified @p Flag 206 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) = 0; 207 208 /// EmitThumbFunc - Note in the output that the specified @p Func is 209 /// a Thumb mode function (ARM target only). 210 virtual void EmitThumbFunc(MCSymbol *Func) = 0; 211 212 /// EmitAssignment - Emit an assignment of @p Value to @p Symbol. 213 /// 214 /// This corresponds to an assembler statement such as: 215 /// symbol = value 216 /// 217 /// The assignment generates no code, but has the side effect of binding the 218 /// value in the current context. For the assembly streamer, this prints the 219 /// binding into the .s file. 220 /// 221 /// @param Symbol - The symbol being assigned to. 222 /// @param Value - The value for the symbol. 223 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) = 0; 224 225 /// EmitWeakReference - Emit an weak reference from @p Alias to @p Symbol. 226 /// 227 /// This corresponds to an assembler statement such as: 228 /// .weakref alias, symbol 229 /// 230 /// @param Alias - The alias that is being created. 231 /// @param Symbol - The symbol being aliased. 232 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) = 0; 233 234 /// EmitSymbolAttribute - Add the given @p Attribute to @p Symbol. 235 virtual void EmitSymbolAttribute(MCSymbol *Symbol, 236 MCSymbolAttr Attribute) = 0; 237 238 /// EmitSymbolDesc - Set the @p DescValue for the @p Symbol. 239 /// 240 /// @param Symbol - The symbol to have its n_desc field set. 241 /// @param DescValue - The value to set into the n_desc field. 242 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) = 0; 243 244 /// BeginCOFFSymbolDef - Start emitting COFF symbol definition 245 /// 246 /// @param Symbol - The symbol to have its External & Type fields set. 247 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) = 0; 248 249 /// EmitCOFFSymbolStorageClass - Emit the storage class of the symbol. 250 /// 251 /// @param StorageClass - The storage class the symbol should have. 252 virtual void EmitCOFFSymbolStorageClass(int StorageClass) = 0; 253 254 /// EmitCOFFSymbolType - Emit the type of the symbol. 255 /// 256 /// @param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h) 257 virtual void EmitCOFFSymbolType(int Type) = 0; 258 259 /// EndCOFFSymbolDef - Marks the end of the symbol definition. 260 virtual void EndCOFFSymbolDef() = 0; 261 262 /// EmitELFSize - Emit an ELF .size directive. 263 /// 264 /// This corresponds to an assembler statement such as: 265 /// .size symbol, expression 266 /// 267 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) = 0; 268 269 /// EmitCommonSymbol - Emit a common symbol. 270 /// 271 /// @param Symbol - The common symbol to emit. 272 /// @param Size - The size of the common symbol. 273 /// @param ByteAlignment - The alignment of the symbol if 274 /// non-zero. This must be a power of 2. 275 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, 276 unsigned ByteAlignment) = 0; 277 278 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol. 279 /// 280 /// @param Symbol - The common symbol to emit. 281 /// @param Size - The size of the common symbol. 282 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) = 0; 283 284 /// EmitZerofill - Emit the zerofill section and an optional symbol. 285 /// 286 /// @param Section - The zerofill section to create and or to put the symbol 287 /// @param Symbol - The zerofill symbol to emit, if non-NULL. 288 /// @param Size - The size of the zerofill symbol. 289 /// @param ByteAlignment - The alignment of the zerofill symbol if 290 /// non-zero. This must be a power of 2 on some targets. 291 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0, 292 unsigned Size = 0,unsigned ByteAlignment = 0) = 0; 293 294 /// EmitTBSSSymbol - Emit a thread local bss (.tbss) symbol. 295 /// 296 /// @param Section - The thread local common section. 297 /// @param Symbol - The thread local common symbol to emit. 298 /// @param Size - The size of the symbol. 299 /// @param ByteAlignment - The alignment of the thread local common symbol 300 /// if non-zero. This must be a power of 2 on some targets. 301 virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, 302 uint64_t Size, unsigned ByteAlignment = 0) = 0; 303 304 /// @} 305 /// @name Generating Data 306 /// @{ 307 308 /// EmitBytes - Emit the bytes in \arg Data into the output. 309 /// 310 /// This is used to implement assembler directives such as .byte, .ascii, 311 /// etc. 312 virtual void EmitBytes(StringRef Data, unsigned AddrSpace) = 0; 313 314 /// EmitValue - Emit the expression @p Value into the output as a native 315 /// integer of the given @p Size bytes. 316 /// 317 /// This is used to implement assembler directives such as .word, .quad, 318 /// etc. 319 /// 320 /// @param Value - The value to emit. 321 /// @param Size - The size of the integer (in bytes) to emit. This must 322 /// match a native machine width. 323 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size, 324 unsigned AddrSpace) = 0; 325 326 void EmitValue(const MCExpr *Value, unsigned Size, unsigned AddrSpace = 0); 327 328 /// EmitIntValue - Special case of EmitValue that avoids the client having 329 /// to pass in a MCExpr for constant integers. 330 virtual void EmitIntValue(uint64_t Value, unsigned Size, 331 unsigned AddrSpace = 0); 332 333 /// EmitAbsValue - Emit the Value, but try to avoid relocations. On MachO 334 /// this is done by producing 335 /// foo = value 336 /// .long foo 337 void EmitAbsValue(const MCExpr *Value, unsigned Size, 338 unsigned AddrSpace = 0); 339 340 virtual void EmitULEB128Value(const MCExpr *Value) = 0; 341 342 virtual void EmitSLEB128Value(const MCExpr *Value) = 0; 343 344 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the 345 /// client having to pass in a MCExpr for constant integers. 346 void EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace = 0); 347 348 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the 349 /// client having to pass in a MCExpr for constant integers. 350 void EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace = 0); 351 352 /// EmitSymbolValue - Special case of EmitValue that avoids the client 353 /// having to pass in a MCExpr for MCSymbols. 354 void EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 355 unsigned AddrSpace = 0); 356 357 /// EmitGPRel32Value - Emit the expression @p Value into the output as a 358 /// gprel32 (32-bit GP relative) value. 359 /// 360 /// This is used to implement assembler directives such as .gprel32 on 361 /// targets that support them. 362 virtual void EmitGPRel32Value(const MCExpr *Value); 363 364 /// EmitFill - Emit NumBytes bytes worth of the value specified by 365 /// FillValue. This implements directives such as '.space'. 366 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue, 367 unsigned AddrSpace); 368 369 /// EmitZeros - Emit NumBytes worth of zeros. This is a convenience 370 /// function that just wraps EmitFill. 371 void EmitZeros(uint64_t NumBytes, unsigned AddrSpace) { 372 EmitFill(NumBytes, 0, AddrSpace); 373 } 374 375 376 /// EmitValueToAlignment - Emit some number of copies of @p Value until 377 /// the byte alignment @p ByteAlignment is reached. 378 /// 379 /// If the number of bytes need to emit for the alignment is not a multiple 380 /// of @p ValueSize, then the contents of the emitted fill bytes is 381 /// undefined. 382 /// 383 /// This used to implement the .align assembler directive. 384 /// 385 /// @param ByteAlignment - The alignment to reach. This must be a power of 386 /// two on some targets. 387 /// @param Value - The value to use when filling bytes. 388 /// @param ValueSize - The size of the integer (in bytes) to emit for 389 /// @p Value. This must match a native machine width. 390 /// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If 391 /// the alignment cannot be reached in this many bytes, no bytes are 392 /// emitted. 393 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0, 394 unsigned ValueSize = 1, 395 unsigned MaxBytesToEmit = 0) = 0; 396 397 /// EmitCodeAlignment - Emit nops until the byte alignment @p ByteAlignment 398 /// is reached. 399 /// 400 /// This used to align code where the alignment bytes may be executed. This 401 /// can emit different bytes for different sizes to optimize execution. 402 /// 403 /// @param ByteAlignment - The alignment to reach. This must be a power of 404 /// two on some targets. 405 /// @param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If 406 /// the alignment cannot be reached in this many bytes, no bytes are 407 /// emitted. 408 virtual void EmitCodeAlignment(unsigned ByteAlignment, 409 unsigned MaxBytesToEmit = 0) = 0; 410 411 /// EmitValueToOffset - Emit some number of copies of @p Value until the 412 /// byte offset @p Offset is reached. 413 /// 414 /// This is used to implement assembler directives such as .org. 415 /// 416 /// @param Offset - The offset to reach. This may be an expression, but the 417 /// expression must be associated with the current section. 418 /// @param Value - The value to use when filling bytes. 419 virtual void EmitValueToOffset(const MCExpr *Offset, 420 unsigned char Value = 0) = 0; 421 422 /// @} 423 424 /// EmitFileDirective - Switch to a new logical file. This is used to 425 /// implement the '.file "foo.c"' assembler directive. 426 virtual void EmitFileDirective(StringRef Filename) = 0; 427 428 /// EmitDwarfFileDirective - Associate a filename with a specified logical 429 /// file number. This implements the DWARF2 '.file 4 "foo.c"' assembler 430 /// directive. 431 virtual bool EmitDwarfFileDirective(unsigned FileNo,StringRef Filename); 432 433 /// EmitDwarfLocDirective - This implements the DWARF2 434 // '.loc fileno lineno ...' assembler directive. 435 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 436 unsigned Column, unsigned Flags, 437 unsigned Isa, 438 unsigned Discriminator, 439 StringRef FileName); 440 441 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta, 442 const MCSymbol *LastLabel, 443 const MCSymbol *Label) = 0; 444 445 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel, 446 const MCSymbol *Label) { 447 } 448 449 void EmitDwarfSetLineAddr(int64_t LineDelta, const MCSymbol *Label, 450 int PointerSize); 451 452 virtual void EmitCFISections(bool EH, bool Debug); 453 virtual void EmitCFIStartProc(); 454 virtual void EmitCFIEndProc(); 455 virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset); 456 virtual void EmitCFIDefCfaOffset(int64_t Offset); 457 virtual void EmitCFIDefCfaRegister(int64_t Register); 458 virtual void EmitCFIOffset(int64_t Register, int64_t Offset); 459 virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding); 460 virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding); 461 virtual void EmitCFIRememberState(); 462 virtual void EmitCFIRestoreState(); 463 virtual void EmitCFISameValue(int64_t Register); 464 virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset); 465 virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment); 466 467 virtual void EmitWin64EHStartProc(MCSymbol *Symbol); 468 virtual void EmitWin64EHEndProc(); 469 virtual void EmitWin64EHStartChained(); 470 virtual void EmitWin64EHEndChained(); 471 virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind, 472 bool Except); 473 virtual void EmitWin64EHHandlerData(); 474 virtual void EmitWin64EHPushReg(unsigned Register); 475 virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset); 476 virtual void EmitWin64EHAllocStack(unsigned Size); 477 virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset); 478 virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset); 479 virtual void EmitWin64EHPushFrame(bool Code); 480 virtual void EmitWin64EHEndProlog(); 481 482 /// EmitInstruction - Emit the given @p Instruction into the current 483 /// section. 484 virtual void EmitInstruction(const MCInst &Inst) = 0; 485 486 /// EmitRawText - If this file is backed by a assembly streamer, this dumps 487 /// the specified string in the output .s file. This capability is 488 /// indicated by the hasRawTextSupport() predicate. By default this aborts. 489 virtual void EmitRawText(StringRef String); 490 void EmitRawText(const Twine &String); 491 492 /// ARM-related methods. 493 /// FIXME: Eventually we should have some "target MC streamer" and move 494 /// these methods there. 495 virtual void EmitFnStart(); 496 virtual void EmitFnEnd(); 497 virtual void EmitCantUnwind(); 498 virtual void EmitPersonality(const MCSymbol *Personality); 499 virtual void EmitHandlerData(); 500 virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0); 501 virtual void EmitPad(int64_t Offset); 502 virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, 503 bool isVector); 504 505 /// Finish - Finish emission of machine code. 506 virtual void Finish() = 0; 507 }; 508 509 /// createNullStreamer - Create a dummy machine code streamer, which does 510 /// nothing. This is useful for timing the assembler front end. 511 MCStreamer *createNullStreamer(MCContext &Ctx); 512 513 /// createAsmStreamer - Create a machine code streamer which will print out 514 /// assembly for the native target, suitable for compiling with a native 515 /// assembler. 516 /// 517 /// \param InstPrint - If given, the instruction printer to use. If not given 518 /// the MCInst representation will be printed. This method takes ownership of 519 /// InstPrint. 520 /// 521 /// \param CE - If given, a code emitter to use to show the instruction 522 /// encoding inline with the assembly. This method takes ownership of \arg CE. 523 /// 524 /// \param TAB - If given, a target asm backend to use to show the fixup 525 /// information in conjunction with encoding information. This method takes 526 /// ownership of \arg TAB. 527 /// 528 /// \param ShowInst - Whether to show the MCInst representation inline with 529 /// the assembly. 530 MCStreamer *createAsmStreamer(MCContext &Ctx, formatted_raw_ostream &OS, 531 bool isVerboseAsm, 532 bool useLoc, 533 bool useCFI, 534 MCInstPrinter *InstPrint = 0, 535 MCCodeEmitter *CE = 0, 536 TargetAsmBackend *TAB = 0, 537 bool ShowInst = false); 538 539 /// createMachOStreamer - Create a machine code streamer which will generate 540 /// Mach-O format object files. 541 /// 542 /// Takes ownership of \arg TAB and \arg CE. 543 MCStreamer *createMachOStreamer(MCContext &Ctx, TargetAsmBackend &TAB, 544 raw_ostream &OS, MCCodeEmitter *CE, 545 bool RelaxAll = false); 546 547 /// createWinCOFFStreamer - Create a machine code streamer which will 548 /// generate Microsoft COFF format object files. 549 /// 550 /// Takes ownership of \arg TAB and \arg CE. 551 MCStreamer *createWinCOFFStreamer(MCContext &Ctx, 552 TargetAsmBackend &TAB, 553 MCCodeEmitter &CE, raw_ostream &OS, 554 bool RelaxAll = false); 555 556 /// createELFStreamer - Create a machine code streamer which will generate 557 /// ELF format object files. 558 MCStreamer *createELFStreamer(MCContext &Ctx, TargetAsmBackend &TAB, 559 raw_ostream &OS, MCCodeEmitter *CE, 560 bool RelaxAll, bool NoExecStack); 561 562 /// createLoggingStreamer - Create a machine code streamer which just logs the 563 /// API calls and then dispatches to another streamer. 564 /// 565 /// The new streamer takes ownership of the \arg Child. 566 MCStreamer *createLoggingStreamer(MCStreamer *Child, raw_ostream &OS); 567 568 /// createPureStreamer - Create a machine code streamer which will generate 569 /// "pure" MC object files, for use with MC-JIT and testing tools. 570 /// 571 /// Takes ownership of \arg TAB and \arg CE. 572 MCStreamer *createPureStreamer(MCContext &Ctx, TargetAsmBackend &TAB, 573 raw_ostream &OS, MCCodeEmitter *CE); 574 575} // end namespace llvm 576 577#endif 578