AsmPrinter.cpp revision c53ade2889c85207e064e4c3d049383ffffb3319
1//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===// 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 implements the AsmPrinter class. 11// 12//===----------------------------------------------------------------------===// 13 14#define DEBUG_TYPE "asm-printer" 15#include "llvm/CodeGen/AsmPrinter.h" 16#include "DwarfDebug.h" 17#include "DwarfException.h" 18#include "llvm/DebugInfo.h" 19#include "llvm/Module.h" 20#include "llvm/CodeGen/GCMetadataPrinter.h" 21#include "llvm/CodeGen/MachineConstantPool.h" 22#include "llvm/CodeGen/MachineFrameInfo.h" 23#include "llvm/CodeGen/MachineFunction.h" 24#include "llvm/CodeGen/MachineJumpTableInfo.h" 25#include "llvm/CodeGen/MachineLoopInfo.h" 26#include "llvm/CodeGen/MachineModuleInfo.h" 27#include "llvm/Analysis/ConstantFolding.h" 28#include "llvm/MC/MCAsmInfo.h" 29#include "llvm/MC/MCContext.h" 30#include "llvm/MC/MCExpr.h" 31#include "llvm/MC/MCInst.h" 32#include "llvm/MC/MCSection.h" 33#include "llvm/MC/MCStreamer.h" 34#include "llvm/MC/MCSymbol.h" 35#include "llvm/Target/Mangler.h" 36#include "llvm/Target/TargetData.h" 37#include "llvm/Target/TargetInstrInfo.h" 38#include "llvm/Target/TargetLowering.h" 39#include "llvm/Target/TargetLoweringObjectFile.h" 40#include "llvm/Target/TargetOptions.h" 41#include "llvm/Target/TargetRegisterInfo.h" 42#include "llvm/Assembly/Writer.h" 43#include "llvm/ADT/SmallString.h" 44#include "llvm/ADT/Statistic.h" 45#include "llvm/Support/ErrorHandling.h" 46#include "llvm/Support/Format.h" 47#include "llvm/Support/MathExtras.h" 48#include "llvm/Support/Timer.h" 49using namespace llvm; 50 51static const char *DWARFGroupName = "DWARF Emission"; 52static const char *DbgTimerName = "DWARF Debug Writer"; 53static const char *EHTimerName = "DWARF Exception Writer"; 54 55STATISTIC(EmittedInsts, "Number of machine instrs printed"); 56 57char AsmPrinter::ID = 0; 58 59typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type; 60static gcp_map_type &getGCMap(void *&P) { 61 if (P == 0) 62 P = new gcp_map_type(); 63 return *(gcp_map_type*)P; 64} 65 66 67/// getGVAlignmentLog2 - Return the alignment to use for the specified global 68/// value in log2 form. This rounds up to the preferred alignment if possible 69/// and legal. 70static unsigned getGVAlignmentLog2(const GlobalValue *GV, const TargetData &TD, 71 unsigned InBits = 0) { 72 unsigned NumBits = 0; 73 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) 74 NumBits = TD.getPreferredAlignmentLog(GVar); 75 76 // If InBits is specified, round it to it. 77 if (InBits > NumBits) 78 NumBits = InBits; 79 80 // If the GV has a specified alignment, take it into account. 81 if (GV->getAlignment() == 0) 82 return NumBits; 83 84 unsigned GVAlign = Log2_32(GV->getAlignment()); 85 86 // If the GVAlign is larger than NumBits, or if we are required to obey 87 // NumBits because the GV has an assigned section, obey it. 88 if (GVAlign > NumBits || GV->hasSection()) 89 NumBits = GVAlign; 90 return NumBits; 91} 92 93 94 95 96AsmPrinter::AsmPrinter(TargetMachine &tm, MCStreamer &Streamer) 97 : MachineFunctionPass(ID), 98 TM(tm), MAI(tm.getMCAsmInfo()), 99 OutContext(Streamer.getContext()), 100 OutStreamer(Streamer), 101 LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) { 102 DD = 0; DE = 0; MMI = 0; LI = 0; 103 CurrentFnSym = CurrentFnSymForSize = 0; 104 GCMetadataPrinters = 0; 105 VerboseAsm = Streamer.isVerboseAsm(); 106} 107 108AsmPrinter::~AsmPrinter() { 109 assert(DD == 0 && DE == 0 && "Debug/EH info didn't get finalized"); 110 111 if (GCMetadataPrinters != 0) { 112 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters); 113 114 for (gcp_map_type::iterator I = GCMap.begin(), E = GCMap.end(); I != E; ++I) 115 delete I->second; 116 delete &GCMap; 117 GCMetadataPrinters = 0; 118 } 119 120 delete &OutStreamer; 121} 122 123/// getFunctionNumber - Return a unique ID for the current function. 124/// 125unsigned AsmPrinter::getFunctionNumber() const { 126 return MF->getFunctionNumber(); 127} 128 129const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const { 130 return TM.getTargetLowering()->getObjFileLowering(); 131} 132 133 134/// getTargetData - Return information about data layout. 135const TargetData &AsmPrinter::getTargetData() const { 136 return *TM.getTargetData(); 137} 138 139/// getCurrentSection() - Return the current section we are emitting to. 140const MCSection *AsmPrinter::getCurrentSection() const { 141 return OutStreamer.getCurrentSection(); 142} 143 144 145 146void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { 147 AU.setPreservesAll(); 148 MachineFunctionPass::getAnalysisUsage(AU); 149 AU.addRequired<MachineModuleInfo>(); 150 AU.addRequired<GCModuleInfo>(); 151 if (isVerbose()) 152 AU.addRequired<MachineLoopInfo>(); 153} 154 155bool AsmPrinter::doInitialization(Module &M) { 156 MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 157 MMI->AnalyzeModule(M); 158 159 // Initialize TargetLoweringObjectFile. 160 const_cast<TargetLoweringObjectFile&>(getObjFileLowering()) 161 .Initialize(OutContext, TM); 162 163 Mang = new Mangler(OutContext, *TM.getTargetData()); 164 165 // Allow the target to emit any magic that it wants at the start of the file. 166 EmitStartOfAsmFile(M); 167 168 // Very minimal debug info. It is ignored if we emit actual debug info. If we 169 // don't, this at least helps the user find where a global came from. 170 if (MAI->hasSingleParameterDotFile()) { 171 // .file "foo.c" 172 OutStreamer.EmitFileDirective(M.getModuleIdentifier()); 173 } 174 175 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 176 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 177 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 178 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 179 MP->beginAssembly(*this); 180 181 // Emit module-level inline asm if it exists. 182 if (!M.getModuleInlineAsm().empty()) { 183 OutStreamer.AddComment("Start of file scope inline assembly"); 184 OutStreamer.AddBlankLine(); 185 EmitInlineAsm(M.getModuleInlineAsm()+"\n"); 186 OutStreamer.AddComment("End of file scope inline assembly"); 187 OutStreamer.AddBlankLine(); 188 } 189 190 if (MAI->doesSupportDebugInformation()) 191 DD = new DwarfDebug(this, &M); 192 193 switch (MAI->getExceptionHandlingType()) { 194 case ExceptionHandling::None: 195 return false; 196 case ExceptionHandling::SjLj: 197 case ExceptionHandling::DwarfCFI: 198 DE = new DwarfCFIException(this); 199 return false; 200 case ExceptionHandling::ARM: 201 DE = new ARMException(this); 202 return false; 203 case ExceptionHandling::Win64: 204 DE = new Win64Exception(this); 205 return false; 206 } 207 208 llvm_unreachable("Unknown exception type."); 209} 210 211void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const { 212 switch ((GlobalValue::LinkageTypes)Linkage) { 213 case GlobalValue::CommonLinkage: 214 case GlobalValue::LinkOnceAnyLinkage: 215 case GlobalValue::LinkOnceODRLinkage: 216 case GlobalValue::LinkOnceODRAutoHideLinkage: 217 case GlobalValue::WeakAnyLinkage: 218 case GlobalValue::WeakODRLinkage: 219 case GlobalValue::LinkerPrivateWeakLinkage: 220 if (MAI->getWeakDefDirective() != 0) { 221 // .globl _foo 222 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 223 224 if ((GlobalValue::LinkageTypes)Linkage != 225 GlobalValue::LinkOnceODRAutoHideLinkage) 226 // .weak_definition _foo 227 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition); 228 else 229 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate); 230 } else if (MAI->getLinkOnceDirective() != 0) { 231 // .globl _foo 232 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 233 //NOTE: linkonce is handled by the section the symbol was assigned to. 234 } else { 235 // .weak _foo 236 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak); 237 } 238 break; 239 case GlobalValue::DLLExportLinkage: 240 case GlobalValue::AppendingLinkage: 241 // FIXME: appending linkage variables should go into a section of 242 // their name or something. For now, just emit them as external. 243 case GlobalValue::ExternalLinkage: 244 // If external or appending, declare as a global symbol. 245 // .globl _foo 246 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 247 break; 248 case GlobalValue::PrivateLinkage: 249 case GlobalValue::InternalLinkage: 250 case GlobalValue::LinkerPrivateLinkage: 251 break; 252 default: 253 llvm_unreachable("Unknown linkage type!"); 254 } 255} 256 257 258/// EmitGlobalVariable - Emit the specified global variable to the .s file. 259void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { 260 if (GV->hasInitializer()) { 261 // Check to see if this is a special global used by LLVM, if so, emit it. 262 if (EmitSpecialLLVMGlobal(GV)) 263 return; 264 265 if (isVerbose()) { 266 WriteAsOperand(OutStreamer.GetCommentOS(), GV, 267 /*PrintType=*/false, GV->getParent()); 268 OutStreamer.GetCommentOS() << '\n'; 269 } 270 } 271 272 MCSymbol *GVSym = Mang->getSymbol(GV); 273 EmitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration()); 274 275 if (!GV->hasInitializer()) // External globals require no extra code. 276 return; 277 278 if (MAI->hasDotTypeDotSizeDirective()) 279 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject); 280 281 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM); 282 283 const TargetData *TD = TM.getTargetData(); 284 uint64_t Size = TD->getTypeAllocSize(GV->getType()->getElementType()); 285 286 // If the alignment is specified, we *must* obey it. Overaligning a global 287 // with a specified alignment is a prompt way to break globals emitted to 288 // sections and expected to be contiguous (e.g. ObjC metadata). 289 unsigned AlignLog = getGVAlignmentLog2(GV, *TD); 290 291 // Handle common and BSS local symbols (.lcomm). 292 if (GVKind.isCommon() || GVKind.isBSSLocal()) { 293 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 294 unsigned Align = 1 << AlignLog; 295 296 // Handle common symbols. 297 if (GVKind.isCommon()) { 298 if (!getObjFileLowering().getCommDirectiveSupportsAlignment()) 299 Align = 0; 300 301 // .comm _foo, 42, 4 302 OutStreamer.EmitCommonSymbol(GVSym, Size, Align); 303 return; 304 } 305 306 // Handle local BSS symbols. 307 if (MAI->hasMachoZeroFillDirective()) { 308 const MCSection *TheSection = 309 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 310 // .zerofill __DATA, __bss, _foo, 400, 5 311 OutStreamer.EmitZerofill(TheSection, GVSym, Size, Align); 312 return; 313 } 314 315 if (Align == 1 || MAI->getLCOMMDirectiveSupportsAlignment()) { 316 // .lcomm _foo, 42 317 OutStreamer.EmitLocalCommonSymbol(GVSym, Size, Align); 318 return; 319 } 320 321 if (!getObjFileLowering().getCommDirectiveSupportsAlignment()) 322 Align = 0; 323 324 // .local _foo 325 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local); 326 // .comm _foo, 42, 4 327 OutStreamer.EmitCommonSymbol(GVSym, Size, Align); 328 return; 329 } 330 331 const MCSection *TheSection = 332 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 333 334 // Handle the zerofill directive on darwin, which is a special form of BSS 335 // emission. 336 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) { 337 if (Size == 0) Size = 1; // zerofill of 0 bytes is undefined. 338 339 // .globl _foo 340 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 341 // .zerofill __DATA, __common, _foo, 400, 5 342 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 343 return; 344 } 345 346 // Handle thread local data for mach-o which requires us to output an 347 // additional structure of data and mangle the original symbol so that we 348 // can reference it later. 349 // 350 // TODO: This should become an "emit thread local global" method on TLOF. 351 // All of this macho specific stuff should be sunk down into TLOFMachO and 352 // stuff like "TLSExtraDataSection" should no longer be part of the parent 353 // TLOF class. This will also make it more obvious that stuff like 354 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho 355 // specific code. 356 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) { 357 // Emit the .tbss symbol 358 MCSymbol *MangSym = 359 OutContext.GetOrCreateSymbol(GVSym->getName() + Twine("$tlv$init")); 360 361 if (GVKind.isThreadBSS()) 362 OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog); 363 else if (GVKind.isThreadData()) { 364 OutStreamer.SwitchSection(TheSection); 365 366 EmitAlignment(AlignLog, GV); 367 OutStreamer.EmitLabel(MangSym); 368 369 EmitGlobalConstant(GV->getInitializer()); 370 } 371 372 OutStreamer.AddBlankLine(); 373 374 // Emit the variable struct for the runtime. 375 const MCSection *TLVSect 376 = getObjFileLowering().getTLSExtraDataSection(); 377 378 OutStreamer.SwitchSection(TLVSect); 379 // Emit the linkage here. 380 EmitLinkage(GV->getLinkage(), GVSym); 381 OutStreamer.EmitLabel(GVSym); 382 383 // Three pointers in size: 384 // - __tlv_bootstrap - used to make sure support exists 385 // - spare pointer, used when mapped by the runtime 386 // - pointer to mangled symbol above with initializer 387 unsigned PtrSize = TD->getPointerSizeInBits()/8; 388 OutStreamer.EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"), 389 PtrSize, 0); 390 OutStreamer.EmitIntValue(0, PtrSize, 0); 391 OutStreamer.EmitSymbolValue(MangSym, PtrSize, 0); 392 393 OutStreamer.AddBlankLine(); 394 return; 395 } 396 397 OutStreamer.SwitchSection(TheSection); 398 399 EmitLinkage(GV->getLinkage(), GVSym); 400 EmitAlignment(AlignLog, GV); 401 402 OutStreamer.EmitLabel(GVSym); 403 404 EmitGlobalConstant(GV->getInitializer()); 405 406 if (MAI->hasDotTypeDotSizeDirective()) 407 // .size foo, 42 408 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext)); 409 410 OutStreamer.AddBlankLine(); 411} 412 413/// EmitFunctionHeader - This method emits the header for the current 414/// function. 415void AsmPrinter::EmitFunctionHeader() { 416 // Print out constants referenced by the function 417 EmitConstantPool(); 418 419 // Print the 'header' of function. 420 const Function *F = MF->getFunction(); 421 422 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM)); 423 EmitVisibility(CurrentFnSym, F->getVisibility()); 424 425 EmitLinkage(F->getLinkage(), CurrentFnSym); 426 EmitAlignment(MF->getAlignment(), F); 427 428 if (MAI->hasDotTypeDotSizeDirective()) 429 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction); 430 431 if (isVerbose()) { 432 WriteAsOperand(OutStreamer.GetCommentOS(), F, 433 /*PrintType=*/false, F->getParent()); 434 OutStreamer.GetCommentOS() << '\n'; 435 } 436 437 // Emit the CurrentFnSym. This is a virtual function to allow targets to 438 // do their wild and crazy things as required. 439 EmitFunctionEntryLabel(); 440 441 // If the function had address-taken blocks that got deleted, then we have 442 // references to the dangling symbols. Emit them at the start of the function 443 // so that we don't get references to undefined symbols. 444 std::vector<MCSymbol*> DeadBlockSyms; 445 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms); 446 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) { 447 OutStreamer.AddComment("Address taken block that was later removed"); 448 OutStreamer.EmitLabel(DeadBlockSyms[i]); 449 } 450 451 // Add some workaround for linkonce linkage on Cygwin\MinGW. 452 if (MAI->getLinkOnceDirective() != 0 && 453 (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) { 454 // FIXME: What is this? 455 MCSymbol *FakeStub = 456 OutContext.GetOrCreateSymbol(Twine("Lllvm$workaround$fake$stub$")+ 457 CurrentFnSym->getName()); 458 OutStreamer.EmitLabel(FakeStub); 459 } 460 461 // Emit pre-function debug and/or EH information. 462 if (DE) { 463 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled); 464 DE->BeginFunction(MF); 465 } 466 if (DD) { 467 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled); 468 DD->beginFunction(MF); 469 } 470} 471 472/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the 473/// function. This can be overridden by targets as required to do custom stuff. 474void AsmPrinter::EmitFunctionEntryLabel() { 475 // The function label could have already been emitted if two symbols end up 476 // conflicting due to asm renaming. Detect this and emit an error. 477 if (CurrentFnSym->isUndefined()) 478 return OutStreamer.EmitLabel(CurrentFnSym); 479 480 report_fatal_error("'" + Twine(CurrentFnSym->getName()) + 481 "' label emitted multiple times to assembly file"); 482} 483 484/// emitComments - Pretty-print comments for instructions. 485static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) { 486 const MachineFunction *MF = MI.getParent()->getParent(); 487 const TargetMachine &TM = MF->getTarget(); 488 489 // Check for spills and reloads 490 int FI; 491 492 const MachineFrameInfo *FrameInfo = MF->getFrameInfo(); 493 494 // We assume a single instruction only has a spill or reload, not 495 // both. 496 const MachineMemOperand *MMO; 497 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) { 498 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 499 MMO = *MI.memoperands_begin(); 500 CommentOS << MMO->getSize() << "-byte Reload\n"; 501 } 502 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) { 503 if (FrameInfo->isSpillSlotObjectIndex(FI)) 504 CommentOS << MMO->getSize() << "-byte Folded Reload\n"; 505 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) { 506 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 507 MMO = *MI.memoperands_begin(); 508 CommentOS << MMO->getSize() << "-byte Spill\n"; 509 } 510 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) { 511 if (FrameInfo->isSpillSlotObjectIndex(FI)) 512 CommentOS << MMO->getSize() << "-byte Folded Spill\n"; 513 } 514 515 // Check for spill-induced copies 516 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse)) 517 CommentOS << " Reload Reuse\n"; 518} 519 520/// emitImplicitDef - This method emits the specified machine instruction 521/// that is an implicit def. 522static void emitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) { 523 unsigned RegNo = MI->getOperand(0).getReg(); 524 AP.OutStreamer.AddComment(Twine("implicit-def: ") + 525 AP.TM.getRegisterInfo()->getName(RegNo)); 526 AP.OutStreamer.AddBlankLine(); 527} 528 529static void emitKill(const MachineInstr *MI, AsmPrinter &AP) { 530 std::string Str = "kill:"; 531 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 532 const MachineOperand &Op = MI->getOperand(i); 533 assert(Op.isReg() && "KILL instruction must have only register operands"); 534 Str += ' '; 535 Str += AP.TM.getRegisterInfo()->getName(Op.getReg()); 536 Str += (Op.isDef() ? "<def>" : "<kill>"); 537 } 538 AP.OutStreamer.AddComment(Str); 539 AP.OutStreamer.AddBlankLine(); 540} 541 542/// emitDebugValueComment - This method handles the target-independent form 543/// of DBG_VALUE, returning true if it was able to do so. A false return 544/// means the target will need to handle MI in EmitInstruction. 545static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) { 546 // This code handles only the 3-operand target-independent form. 547 if (MI->getNumOperands() != 3) 548 return false; 549 550 SmallString<128> Str; 551 raw_svector_ostream OS(Str); 552 OS << '\t' << AP.MAI->getCommentString() << "DEBUG_VALUE: "; 553 554 // cast away const; DIetc do not take const operands for some reason. 555 DIVariable V(const_cast<MDNode*>(MI->getOperand(2).getMetadata())); 556 if (V.getContext().isSubprogram()) 557 OS << DISubprogram(V.getContext()).getDisplayName() << ":"; 558 OS << V.getName() << " <- "; 559 560 // Register or immediate value. Register 0 means undef. 561 if (MI->getOperand(0).isFPImm()) { 562 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF()); 563 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) { 564 OS << (double)APF.convertToFloat(); 565 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) { 566 OS << APF.convertToDouble(); 567 } else { 568 // There is no good way to print long double. Convert a copy to 569 // double. Ah well, it's only a comment. 570 bool ignored; 571 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 572 &ignored); 573 OS << "(long double) " << APF.convertToDouble(); 574 } 575 } else if (MI->getOperand(0).isImm()) { 576 OS << MI->getOperand(0).getImm(); 577 } else if (MI->getOperand(0).isCImm()) { 578 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/); 579 } else { 580 assert(MI->getOperand(0).isReg() && "Unknown operand type"); 581 if (MI->getOperand(0).getReg() == 0) { 582 // Suppress offset, it is not meaningful here. 583 OS << "undef"; 584 // NOTE: Want this comment at start of line, don't emit with AddComment. 585 AP.OutStreamer.EmitRawText(OS.str()); 586 return true; 587 } 588 OS << AP.TM.getRegisterInfo()->getName(MI->getOperand(0).getReg()); 589 } 590 591 OS << '+' << MI->getOperand(1).getImm(); 592 // NOTE: Want this comment at start of line, don't emit with AddComment. 593 AP.OutStreamer.EmitRawText(OS.str()); 594 return true; 595} 596 597AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() { 598 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI && 599 MF->getFunction()->needsUnwindTableEntry()) 600 return CFI_M_EH; 601 602 if (MMI->hasDebugInfo()) 603 return CFI_M_Debug; 604 605 return CFI_M_None; 606} 607 608bool AsmPrinter::needsSEHMoves() { 609 return MAI->getExceptionHandlingType() == ExceptionHandling::Win64 && 610 MF->getFunction()->needsUnwindTableEntry(); 611} 612 613bool AsmPrinter::needsRelocationsForDwarfStringPool() const { 614 return MAI->doesDwarfUseRelocationsAcrossSections(); 615} 616 617void AsmPrinter::emitPrologLabel(const MachineInstr &MI) { 618 MCSymbol *Label = MI.getOperand(0).getMCSymbol(); 619 620 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI) 621 return; 622 623 if (needsCFIMoves() == CFI_M_None) 624 return; 625 626 if (MMI->getCompactUnwindEncoding() != 0) 627 OutStreamer.EmitCompactUnwindEncoding(MMI->getCompactUnwindEncoding()); 628 629 MachineModuleInfo &MMI = MF->getMMI(); 630 std::vector<MachineMove> &Moves = MMI.getFrameMoves(); 631 bool FoundOne = false; 632 (void)FoundOne; 633 for (std::vector<MachineMove>::iterator I = Moves.begin(), 634 E = Moves.end(); I != E; ++I) { 635 if (I->getLabel() == Label) { 636 EmitCFIFrameMove(*I); 637 FoundOne = true; 638 } 639 } 640 assert(FoundOne); 641} 642 643/// EmitFunctionBody - This method emits the body and trailer for a 644/// function. 645void AsmPrinter::EmitFunctionBody() { 646 // Emit target-specific gunk before the function body. 647 EmitFunctionBodyStart(); 648 649 bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo(); 650 651 // Print out code for the function. 652 bool HasAnyRealCode = false; 653 const MachineInstr *LastMI = 0; 654 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); 655 I != E; ++I) { 656 // Print a label for the basic block. 657 EmitBasicBlockStart(I); 658 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end(); 659 II != IE; ++II) { 660 LastMI = II; 661 662 // Print the assembly for the instruction. 663 if (!II->isLabel() && !II->isImplicitDef() && !II->isKill() && 664 !II->isDebugValue()) { 665 HasAnyRealCode = true; 666 ++EmittedInsts; 667 } 668 669 if (ShouldPrintDebugScopes) { 670 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled); 671 DD->beginInstruction(II); 672 } 673 674 if (isVerbose()) 675 emitComments(*II, OutStreamer.GetCommentOS()); 676 677 switch (II->getOpcode()) { 678 case TargetOpcode::PROLOG_LABEL: 679 emitPrologLabel(*II); 680 break; 681 682 case TargetOpcode::EH_LABEL: 683 case TargetOpcode::GC_LABEL: 684 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol()); 685 break; 686 case TargetOpcode::INLINEASM: 687 EmitInlineAsm(II); 688 break; 689 case TargetOpcode::DBG_VALUE: 690 if (isVerbose()) { 691 if (!emitDebugValueComment(II, *this)) 692 EmitInstruction(II); 693 } 694 break; 695 case TargetOpcode::IMPLICIT_DEF: 696 if (isVerbose()) emitImplicitDef(II, *this); 697 break; 698 case TargetOpcode::KILL: 699 if (isVerbose()) emitKill(II, *this); 700 break; 701 default: 702 if (!TM.hasMCUseLoc()) 703 MCLineEntry::Make(&OutStreamer, getCurrentSection()); 704 705 EmitInstruction(II); 706 break; 707 } 708 709 if (ShouldPrintDebugScopes) { 710 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled); 711 DD->endInstruction(II); 712 } 713 } 714 } 715 716 // If the last instruction was a prolog label, then we have a situation where 717 // we emitted a prolog but no function body. This results in the ending prolog 718 // label equaling the end of function label and an invalid "row" in the 719 // FDE. We need to emit a noop in this situation so that the FDE's rows are 720 // valid. 721 bool RequiresNoop = LastMI && LastMI->isPrologLabel(); 722 723 // If the function is empty and the object file uses .subsections_via_symbols, 724 // then we need to emit *something* to the function body to prevent the 725 // labels from collapsing together. Just emit a noop. 726 if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) || RequiresNoop) { 727 MCInst Noop; 728 TM.getInstrInfo()->getNoopForMachoTarget(Noop); 729 if (Noop.getOpcode()) { 730 OutStreamer.AddComment("avoids zero-length function"); 731 OutStreamer.EmitInstruction(Noop); 732 } else // Target not mc-ized yet. 733 OutStreamer.EmitRawText(StringRef("\tnop\n")); 734 } 735 736 const Function *F = MF->getFunction(); 737 for (Function::const_iterator i = F->begin(), e = F->end(); i != e; ++i) { 738 const BasicBlock *BB = i; 739 if (!BB->hasAddressTaken()) 740 continue; 741 MCSymbol *Sym = GetBlockAddressSymbol(BB); 742 if (Sym->isDefined()) 743 continue; 744 OutStreamer.AddComment("Address of block that was removed by CodeGen"); 745 OutStreamer.EmitLabel(Sym); 746 } 747 748 // Emit target-specific gunk after the function body. 749 EmitFunctionBodyEnd(); 750 751 // If the target wants a .size directive for the size of the function, emit 752 // it. 753 if (MAI->hasDotTypeDotSizeDirective()) { 754 // Create a symbol for the end of function, so we can get the size as 755 // difference between the function label and the temp label. 756 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol(); 757 OutStreamer.EmitLabel(FnEndLabel); 758 759 const MCExpr *SizeExp = 760 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext), 761 MCSymbolRefExpr::Create(CurrentFnSymForSize, 762 OutContext), 763 OutContext); 764 OutStreamer.EmitELFSize(CurrentFnSym, SizeExp); 765 } 766 767 // Emit post-function debug information. 768 if (DD) { 769 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled); 770 DD->endFunction(MF); 771 } 772 if (DE) { 773 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled); 774 DE->EndFunction(); 775 } 776 MMI->EndFunction(); 777 778 // Print out jump tables referenced by the function. 779 EmitJumpTableInfo(); 780 781 OutStreamer.AddBlankLine(); 782} 783 784/// getDebugValueLocation - Get location information encoded by DBG_VALUE 785/// operands. 786MachineLocation AsmPrinter:: 787getDebugValueLocation(const MachineInstr *MI) const { 788 // Target specific DBG_VALUE instructions are handled by each target. 789 return MachineLocation(); 790} 791 792/// EmitDwarfRegOp - Emit dwarf register operation. 793void AsmPrinter::EmitDwarfRegOp(const MachineLocation &MLoc) const { 794 const TargetRegisterInfo *TRI = TM.getRegisterInfo(); 795 int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false); 796 797 for (MCSuperRegIterator SR(MLoc.getReg(), TRI); SR.isValid() && Reg < 0; 798 ++SR) { 799 Reg = TRI->getDwarfRegNum(*SR, false); 800 // FIXME: Get the bit range this register uses of the superregister 801 // so that we can produce a DW_OP_bit_piece 802 } 803 804 // FIXME: Handle cases like a super register being encoded as 805 // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33 806 807 // FIXME: We have no reasonable way of handling errors in here. The 808 // caller might be in the middle of an dwarf expression. We should 809 // probably assert that Reg >= 0 once debug info generation is more mature. 810 811 if (int Offset = MLoc.getOffset()) { 812 if (Reg < 32) { 813 OutStreamer.AddComment( 814 dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg)); 815 EmitInt8(dwarf::DW_OP_breg0 + Reg); 816 } else { 817 OutStreamer.AddComment("DW_OP_bregx"); 818 EmitInt8(dwarf::DW_OP_bregx); 819 OutStreamer.AddComment(Twine(Reg)); 820 EmitULEB128(Reg); 821 } 822 EmitSLEB128(Offset); 823 } else { 824 if (Reg < 32) { 825 OutStreamer.AddComment( 826 dwarf::OperationEncodingString(dwarf::DW_OP_reg0 + Reg)); 827 EmitInt8(dwarf::DW_OP_reg0 + Reg); 828 } else { 829 OutStreamer.AddComment("DW_OP_regx"); 830 EmitInt8(dwarf::DW_OP_regx); 831 OutStreamer.AddComment(Twine(Reg)); 832 EmitULEB128(Reg); 833 } 834 } 835 836 // FIXME: Produce a DW_OP_bit_piece if we used a superregister 837} 838 839bool AsmPrinter::doFinalization(Module &M) { 840 // Emit global variables. 841 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 842 I != E; ++I) 843 EmitGlobalVariable(I); 844 845 // Emit visibility info for declarations 846 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) { 847 const Function &F = *I; 848 if (!F.isDeclaration()) 849 continue; 850 GlobalValue::VisibilityTypes V = F.getVisibility(); 851 if (V == GlobalValue::DefaultVisibility) 852 continue; 853 854 MCSymbol *Name = Mang->getSymbol(&F); 855 EmitVisibility(Name, V, false); 856 } 857 858 // Emit module flags. 859 SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags; 860 M.getModuleFlagsMetadata(ModuleFlags); 861 if (!ModuleFlags.empty()) 862 getObjFileLowering().emitModuleFlags(OutStreamer, ModuleFlags, Mang, TM); 863 864 // Finalize debug and EH information. 865 if (DE) { 866 { 867 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled); 868 DE->EndModule(); 869 } 870 delete DE; DE = 0; 871 } 872 if (DD) { 873 { 874 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled); 875 DD->endModule(); 876 } 877 delete DD; DD = 0; 878 } 879 880 // If the target wants to know about weak references, print them all. 881 if (MAI->getWeakRefDirective()) { 882 // FIXME: This is not lazy, it would be nice to only print weak references 883 // to stuff that is actually used. Note that doing so would require targets 884 // to notice uses in operands (due to constant exprs etc). This should 885 // happen with the MC stuff eventually. 886 887 // Print out module-level global variables here. 888 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 889 I != E; ++I) { 890 if (!I->hasExternalWeakLinkage()) continue; 891 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference); 892 } 893 894 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) { 895 if (!I->hasExternalWeakLinkage()) continue; 896 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference); 897 } 898 } 899 900 if (MAI->hasSetDirective()) { 901 OutStreamer.AddBlankLine(); 902 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 903 I != E; ++I) { 904 MCSymbol *Name = Mang->getSymbol(I); 905 906 const GlobalValue *GV = I->getAliasedGlobal(); 907 MCSymbol *Target = Mang->getSymbol(GV); 908 909 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective()) 910 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global); 911 else if (I->hasWeakLinkage()) 912 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference); 913 else 914 assert(I->hasLocalLinkage() && "Invalid alias linkage"); 915 916 EmitVisibility(Name, I->getVisibility()); 917 918 // Emit the directives as assignments aka .set: 919 OutStreamer.EmitAssignment(Name, 920 MCSymbolRefExpr::Create(Target, OutContext)); 921 } 922 } 923 924 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 925 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 926 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 927 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 928 MP->finishAssembly(*this); 929 930 // If we don't have any trampolines, then we don't require stack memory 931 // to be executable. Some targets have a directive to declare this. 932 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 933 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 934 if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext)) 935 OutStreamer.SwitchSection(S); 936 937 // Allow the target to emit any magic that it wants at the end of the file, 938 // after everything else has gone out. 939 EmitEndOfAsmFile(M); 940 941 delete Mang; Mang = 0; 942 MMI = 0; 943 944 OutStreamer.Finish(); 945 return false; 946} 947 948void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 949 this->MF = &MF; 950 // Get the function symbol. 951 CurrentFnSym = Mang->getSymbol(MF.getFunction()); 952 CurrentFnSymForSize = CurrentFnSym; 953 954 if (isVerbose()) 955 LI = &getAnalysis<MachineLoopInfo>(); 956} 957 958namespace { 959 // SectionCPs - Keep track the alignment, constpool entries per Section. 960 struct SectionCPs { 961 const MCSection *S; 962 unsigned Alignment; 963 SmallVector<unsigned, 4> CPEs; 964 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {} 965 }; 966} 967 968/// EmitConstantPool - Print to the current output stream assembly 969/// representations of the constants in the constant pool MCP. This is 970/// used to print out constants which have been "spilled to memory" by 971/// the code generator. 972/// 973void AsmPrinter::EmitConstantPool() { 974 const MachineConstantPool *MCP = MF->getConstantPool(); 975 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 976 if (CP.empty()) return; 977 978 // Calculate sections for constant pool entries. We collect entries to go into 979 // the same section together to reduce amount of section switch statements. 980 SmallVector<SectionCPs, 4> CPSections; 981 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 982 const MachineConstantPoolEntry &CPE = CP[i]; 983 unsigned Align = CPE.getAlignment(); 984 985 SectionKind Kind; 986 switch (CPE.getRelocationInfo()) { 987 default: llvm_unreachable("Unknown section kind"); 988 case 2: Kind = SectionKind::getReadOnlyWithRel(); break; 989 case 1: 990 Kind = SectionKind::getReadOnlyWithRelLocal(); 991 break; 992 case 0: 993 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) { 994 case 4: Kind = SectionKind::getMergeableConst4(); break; 995 case 8: Kind = SectionKind::getMergeableConst8(); break; 996 case 16: Kind = SectionKind::getMergeableConst16();break; 997 default: Kind = SectionKind::getMergeableConst(); break; 998 } 999 } 1000 1001 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind); 1002 1003 // The number of sections are small, just do a linear search from the 1004 // last section to the first. 1005 bool Found = false; 1006 unsigned SecIdx = CPSections.size(); 1007 while (SecIdx != 0) { 1008 if (CPSections[--SecIdx].S == S) { 1009 Found = true; 1010 break; 1011 } 1012 } 1013 if (!Found) { 1014 SecIdx = CPSections.size(); 1015 CPSections.push_back(SectionCPs(S, Align)); 1016 } 1017 1018 if (Align > CPSections[SecIdx].Alignment) 1019 CPSections[SecIdx].Alignment = Align; 1020 CPSections[SecIdx].CPEs.push_back(i); 1021 } 1022 1023 // Now print stuff into the calculated sections. 1024 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) { 1025 OutStreamer.SwitchSection(CPSections[i].S); 1026 EmitAlignment(Log2_32(CPSections[i].Alignment)); 1027 1028 unsigned Offset = 0; 1029 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) { 1030 unsigned CPI = CPSections[i].CPEs[j]; 1031 MachineConstantPoolEntry CPE = CP[CPI]; 1032 1033 // Emit inter-object padding for alignment. 1034 unsigned AlignMask = CPE.getAlignment() - 1; 1035 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask; 1036 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/); 1037 1038 Type *Ty = CPE.getType(); 1039 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty); 1040 OutStreamer.EmitLabel(GetCPISymbol(CPI)); 1041 1042 if (CPE.isMachineConstantPoolEntry()) 1043 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); 1044 else 1045 EmitGlobalConstant(CPE.Val.ConstVal); 1046 } 1047 } 1048} 1049 1050/// EmitJumpTableInfo - Print assembly representations of the jump tables used 1051/// by the current function to the current output stream. 1052/// 1053void AsmPrinter::EmitJumpTableInfo() { 1054 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo(); 1055 if (MJTI == 0) return; 1056 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return; 1057 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 1058 if (JT.empty()) return; 1059 1060 // Pick the directive to use to print the jump table entries, and switch to 1061 // the appropriate section. 1062 const Function *F = MF->getFunction(); 1063 bool JTInDiffSection = false; 1064 if (// In PIC mode, we need to emit the jump table to the same section as the 1065 // function body itself, otherwise the label differences won't make sense. 1066 // FIXME: Need a better predicate for this: what about custom entries? 1067 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 || 1068 // We should also do if the section name is NULL or function is declared 1069 // in discardable section 1070 // FIXME: this isn't the right predicate, should be based on the MCSection 1071 // for the function. 1072 F->isWeakForLinker()) { 1073 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM)); 1074 } else { 1075 // Otherwise, drop it in the readonly section. 1076 const MCSection *ReadOnlySection = 1077 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly()); 1078 OutStreamer.SwitchSection(ReadOnlySection); 1079 JTInDiffSection = true; 1080 } 1081 1082 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData()))); 1083 1084 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) { 1085 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs; 1086 1087 // If this jump table was deleted, ignore it. 1088 if (JTBBs.empty()) continue; 1089 1090 // For the EK_LabelDifference32 entry, if the target supports .set, emit a 1091 // .set directive for each unique entry. This reduces the number of 1092 // relocations the assembler will generate for the jump table. 1093 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 && 1094 MAI->hasSetDirective()) { 1095 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets; 1096 const TargetLowering *TLI = TM.getTargetLowering(); 1097 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext); 1098 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 1099 const MachineBasicBlock *MBB = JTBBs[ii]; 1100 if (!EmittedSets.insert(MBB)) continue; 1101 1102 // .set LJTSet, LBB32-base 1103 const MCExpr *LHS = 1104 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext); 1105 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()), 1106 MCBinaryExpr::CreateSub(LHS, Base, OutContext)); 1107 } 1108 } 1109 1110 // On some targets (e.g. Darwin) we want to emit two consecutive labels 1111 // before each jump table. The first label is never referenced, but tells 1112 // the assembler and linker the extents of the jump table object. The 1113 // second label is actually referenced by the code. 1114 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) 1115 // FIXME: This doesn't have to have any specific name, just any randomly 1116 // named and numbered 'l' label would work. Simplify GetJTISymbol. 1117 OutStreamer.EmitLabel(GetJTISymbol(JTI, true)); 1118 1119 OutStreamer.EmitLabel(GetJTISymbol(JTI)); 1120 1121 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 1122 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI); 1123 } 1124} 1125 1126/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the 1127/// current stream. 1128void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI, 1129 const MachineBasicBlock *MBB, 1130 unsigned UID) const { 1131 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block"); 1132 const MCExpr *Value = 0; 1133 switch (MJTI->getEntryKind()) { 1134 case MachineJumpTableInfo::EK_Inline: 1135 llvm_unreachable("Cannot emit EK_Inline jump table entry"); 1136 case MachineJumpTableInfo::EK_Custom32: 1137 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID, 1138 OutContext); 1139 break; 1140 case MachineJumpTableInfo::EK_BlockAddress: 1141 // EK_BlockAddress - Each entry is a plain address of block, e.g.: 1142 // .word LBB123 1143 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext); 1144 break; 1145 case MachineJumpTableInfo::EK_GPRel32BlockAddress: { 1146 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded 1147 // with a relocation as gp-relative, e.g.: 1148 // .gprel32 LBB123 1149 MCSymbol *MBBSym = MBB->getSymbol(); 1150 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext)); 1151 return; 1152 } 1153 1154 case MachineJumpTableInfo::EK_GPRel64BlockAddress: { 1155 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded 1156 // with a relocation as gp-relative, e.g.: 1157 // .gpdword LBB123 1158 MCSymbol *MBBSym = MBB->getSymbol(); 1159 OutStreamer.EmitGPRel64Value(MCSymbolRefExpr::Create(MBBSym, OutContext)); 1160 return; 1161 } 1162 1163 case MachineJumpTableInfo::EK_LabelDifference32: { 1164 // EK_LabelDifference32 - Each entry is the address of the block minus 1165 // the address of the jump table. This is used for PIC jump tables where 1166 // gprel32 is not supported. e.g.: 1167 // .word LBB123 - LJTI1_2 1168 // If the .set directive is supported, this is emitted as: 1169 // .set L4_5_set_123, LBB123 - LJTI1_2 1170 // .word L4_5_set_123 1171 1172 // If we have emitted set directives for the jump table entries, print 1173 // them rather than the entries themselves. If we're emitting PIC, then 1174 // emit the table entries as differences between two text section labels. 1175 if (MAI->hasSetDirective()) { 1176 // If we used .set, reference the .set's symbol. 1177 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()), 1178 OutContext); 1179 break; 1180 } 1181 // Otherwise, use the difference as the jump table entry. 1182 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext); 1183 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext); 1184 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext); 1185 break; 1186 } 1187 } 1188 1189 assert(Value && "Unknown entry kind!"); 1190 1191 unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData()); 1192 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0); 1193} 1194 1195 1196/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 1197/// special global used by LLVM. If so, emit it and return true, otherwise 1198/// do nothing and return false. 1199bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 1200 if (GV->getName() == "llvm.used") { 1201 if (MAI->hasNoDeadStrip()) // No need to emit this at all. 1202 EmitLLVMUsedList(GV->getInitializer()); 1203 return true; 1204 } 1205 1206 // Ignore debug and non-emitted data. This handles llvm.compiler.used. 1207 if (GV->getSection() == "llvm.metadata" || 1208 GV->hasAvailableExternallyLinkage()) 1209 return true; 1210 1211 if (!GV->hasAppendingLinkage()) return false; 1212 1213 assert(GV->hasInitializer() && "Not a special LLVM global!"); 1214 1215 if (GV->getName() == "llvm.global_ctors") { 1216 EmitXXStructorList(GV->getInitializer(), /* isCtor */ true); 1217 1218 if (TM.getRelocationModel() == Reloc::Static && 1219 MAI->hasStaticCtorDtorReferenceInStaticMode()) { 1220 StringRef Sym(".constructors_used"); 1221 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 1222 MCSA_Reference); 1223 } 1224 return true; 1225 } 1226 1227 if (GV->getName() == "llvm.global_dtors") { 1228 EmitXXStructorList(GV->getInitializer(), /* isCtor */ false); 1229 1230 if (TM.getRelocationModel() == Reloc::Static && 1231 MAI->hasStaticCtorDtorReferenceInStaticMode()) { 1232 StringRef Sym(".destructors_used"); 1233 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 1234 MCSA_Reference); 1235 } 1236 return true; 1237 } 1238 1239 return false; 1240} 1241 1242/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each 1243/// global in the specified llvm.used list for which emitUsedDirectiveFor 1244/// is true, as being used with this directive. 1245void AsmPrinter::EmitLLVMUsedList(const Constant *List) { 1246 // Should be an array of 'i8*'. 1247 const ConstantArray *InitList = dyn_cast<ConstantArray>(List); 1248 if (InitList == 0) return; 1249 1250 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 1251 const GlobalValue *GV = 1252 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts()); 1253 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) 1254 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip); 1255 } 1256} 1257 1258typedef std::pair<unsigned, Constant*> Structor; 1259 1260static bool priority_order(const Structor& lhs, const Structor& rhs) { 1261 return lhs.first < rhs.first; 1262} 1263 1264/// EmitXXStructorList - Emit the ctor or dtor list taking into account the init 1265/// priority. 1266void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) { 1267 // Should be an array of '{ int, void ()* }' structs. The first value is the 1268 // init priority. 1269 if (!isa<ConstantArray>(List)) return; 1270 1271 // Sanity check the structors list. 1272 const ConstantArray *InitList = dyn_cast<ConstantArray>(List); 1273 if (!InitList) return; // Not an array! 1274 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType()); 1275 if (!ETy || ETy->getNumElements() != 2) return; // Not an array of pairs! 1276 if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) || 1277 !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr). 1278 1279 // Gather the structors in a form that's convenient for sorting by priority. 1280 SmallVector<Structor, 8> Structors; 1281 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 1282 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i)); 1283 if (!CS) continue; // Malformed. 1284 if (CS->getOperand(1)->isNullValue()) 1285 break; // Found a null terminator, skip the rest. 1286 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0)); 1287 if (!Priority) continue; // Malformed. 1288 Structors.push_back(std::make_pair(Priority->getLimitedValue(65535), 1289 CS->getOperand(1))); 1290 } 1291 1292 // Emit the function pointers in the target-specific order 1293 const TargetData *TD = TM.getTargetData(); 1294 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 1295 std::stable_sort(Structors.begin(), Structors.end(), priority_order); 1296 for (unsigned i = 0, e = Structors.size(); i != e; ++i) { 1297 const MCSection *OutputSection = 1298 (isCtor ? 1299 getObjFileLowering().getStaticCtorSection(Structors[i].first) : 1300 getObjFileLowering().getStaticDtorSection(Structors[i].first)); 1301 OutStreamer.SwitchSection(OutputSection); 1302 if (OutStreamer.getCurrentSection() != OutStreamer.getPreviousSection()) 1303 EmitAlignment(Align); 1304 EmitXXStructor(Structors[i].second); 1305 } 1306} 1307 1308//===--------------------------------------------------------------------===// 1309// Emission and print routines 1310// 1311 1312/// EmitInt8 - Emit a byte directive and value. 1313/// 1314void AsmPrinter::EmitInt8(int Value) const { 1315 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/); 1316} 1317 1318/// EmitInt16 - Emit a short directive and value. 1319/// 1320void AsmPrinter::EmitInt16(int Value) const { 1321 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/); 1322} 1323 1324/// EmitInt32 - Emit a long directive and value. 1325/// 1326void AsmPrinter::EmitInt32(int Value) const { 1327 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/); 1328} 1329 1330/// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size 1331/// in bytes of the directive is specified by Size and Hi/Lo specify the 1332/// labels. This implicitly uses .set if it is available. 1333void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo, 1334 unsigned Size) const { 1335 // Get the Hi-Lo expression. 1336 const MCExpr *Diff = 1337 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext), 1338 MCSymbolRefExpr::Create(Lo, OutContext), 1339 OutContext); 1340 1341 if (!MAI->hasSetDirective()) { 1342 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/); 1343 return; 1344 } 1345 1346 // Otherwise, emit with .set (aka assignment). 1347 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++); 1348 OutStreamer.EmitAssignment(SetLabel, Diff); 1349 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/); 1350} 1351 1352/// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo" 1353/// where the size in bytes of the directive is specified by Size and Hi/Lo 1354/// specify the labels. This implicitly uses .set if it is available. 1355void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset, 1356 const MCSymbol *Lo, unsigned Size) 1357 const { 1358 1359 // Emit Hi+Offset - Lo 1360 // Get the Hi+Offset expression. 1361 const MCExpr *Plus = 1362 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext), 1363 MCConstantExpr::Create(Offset, OutContext), 1364 OutContext); 1365 1366 // Get the Hi+Offset-Lo expression. 1367 const MCExpr *Diff = 1368 MCBinaryExpr::CreateSub(Plus, 1369 MCSymbolRefExpr::Create(Lo, OutContext), 1370 OutContext); 1371 1372 if (!MAI->hasSetDirective()) 1373 OutStreamer.EmitValue(Diff, 4, 0/*AddrSpace*/); 1374 else { 1375 // Otherwise, emit with .set (aka assignment). 1376 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++); 1377 OutStreamer.EmitAssignment(SetLabel, Diff); 1378 OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/); 1379 } 1380} 1381 1382/// EmitLabelPlusOffset - Emit something like ".long Label+Offset" 1383/// where the size in bytes of the directive is specified by Size and Label 1384/// specifies the label. This implicitly uses .set if it is available. 1385void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset, 1386 unsigned Size) 1387 const { 1388 1389 // Emit Label+Offset (or just Label if Offset is zero) 1390 const MCExpr *Expr = MCSymbolRefExpr::Create(Label, OutContext); 1391 if (Offset) 1392 Expr = MCBinaryExpr::CreateAdd(Expr, 1393 MCConstantExpr::Create(Offset, OutContext), 1394 OutContext); 1395 1396 OutStreamer.EmitValue(Expr, Size, 0/*AddrSpace*/); 1397} 1398 1399 1400//===----------------------------------------------------------------------===// 1401 1402// EmitAlignment - Emit an alignment directive to the specified power of 1403// two boundary. For example, if you pass in 3 here, you will get an 8 1404// byte alignment. If a global value is specified, and if that global has 1405// an explicit alignment requested, it will override the alignment request 1406// if required for correctness. 1407// 1408void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const { 1409 if (GV) NumBits = getGVAlignmentLog2(GV, *TM.getTargetData(), NumBits); 1410 1411 if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment. 1412 1413 if (getCurrentSection()->getKind().isText()) 1414 OutStreamer.EmitCodeAlignment(1 << NumBits); 1415 else 1416 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0); 1417} 1418 1419//===----------------------------------------------------------------------===// 1420// Constant emission. 1421//===----------------------------------------------------------------------===// 1422 1423/// lowerConstant - Lower the specified LLVM Constant to an MCExpr. 1424/// 1425static const MCExpr *lowerConstant(const Constant *CV, AsmPrinter &AP) { 1426 MCContext &Ctx = AP.OutContext; 1427 1428 if (CV->isNullValue() || isa<UndefValue>(CV)) 1429 return MCConstantExpr::Create(0, Ctx); 1430 1431 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) 1432 return MCConstantExpr::Create(CI->getZExtValue(), Ctx); 1433 1434 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) 1435 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx); 1436 1437 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) 1438 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx); 1439 1440 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV); 1441 if (CE == 0) { 1442 llvm_unreachable("Unknown constant value to lower!"); 1443 } 1444 1445 switch (CE->getOpcode()) { 1446 default: 1447 // If the code isn't optimized, there may be outstanding folding 1448 // opportunities. Attempt to fold the expression using TargetData as a 1449 // last resort before giving up. 1450 if (Constant *C = 1451 ConstantFoldConstantExpression(CE, AP.TM.getTargetData())) 1452 if (C != CE) 1453 return lowerConstant(C, AP); 1454 1455 // Otherwise report the problem to the user. 1456 { 1457 std::string S; 1458 raw_string_ostream OS(S); 1459 OS << "Unsupported expression in static initializer: "; 1460 WriteAsOperand(OS, CE, /*PrintType=*/false, 1461 !AP.MF ? 0 : AP.MF->getFunction()->getParent()); 1462 report_fatal_error(OS.str()); 1463 } 1464 case Instruction::GetElementPtr: { 1465 const TargetData &TD = *AP.TM.getTargetData(); 1466 // Generate a symbolic expression for the byte address 1467 const Constant *PtrVal = CE->getOperand(0); 1468 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end()); 1469 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), IdxVec); 1470 1471 const MCExpr *Base = lowerConstant(CE->getOperand(0), AP); 1472 if (Offset == 0) 1473 return Base; 1474 1475 // Truncate/sext the offset to the pointer size. 1476 unsigned Width = TD.getPointerSizeInBits(); 1477 if (Width < 64) 1478 Offset = SignExtend64(Offset, Width); 1479 1480 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx), 1481 Ctx); 1482 } 1483 1484 case Instruction::Trunc: 1485 // We emit the value and depend on the assembler to truncate the generated 1486 // expression properly. This is important for differences between 1487 // blockaddress labels. Since the two labels are in the same function, it 1488 // is reasonable to treat their delta as a 32-bit value. 1489 // FALL THROUGH. 1490 case Instruction::BitCast: 1491 return lowerConstant(CE->getOperand(0), AP); 1492 1493 case Instruction::IntToPtr: { 1494 const TargetData &TD = *AP.TM.getTargetData(); 1495 // Handle casts to pointers by changing them into casts to the appropriate 1496 // integer type. This promotes constant folding and simplifies this code. 1497 Constant *Op = CE->getOperand(0); 1498 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()), 1499 false/*ZExt*/); 1500 return lowerConstant(Op, AP); 1501 } 1502 1503 case Instruction::PtrToInt: { 1504 const TargetData &TD = *AP.TM.getTargetData(); 1505 // Support only foldable casts to/from pointers that can be eliminated by 1506 // changing the pointer to the appropriately sized integer type. 1507 Constant *Op = CE->getOperand(0); 1508 Type *Ty = CE->getType(); 1509 1510 const MCExpr *OpExpr = lowerConstant(Op, AP); 1511 1512 // We can emit the pointer value into this slot if the slot is an 1513 // integer slot equal to the size of the pointer. 1514 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType())) 1515 return OpExpr; 1516 1517 // Otherwise the pointer is smaller than the resultant integer, mask off 1518 // the high bits so we are sure to get a proper truncation if the input is 1519 // a constant expr. 1520 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType()); 1521 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx); 1522 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx); 1523 } 1524 1525 // The MC library also has a right-shift operator, but it isn't consistently 1526 // signed or unsigned between different targets. 1527 case Instruction::Add: 1528 case Instruction::Sub: 1529 case Instruction::Mul: 1530 case Instruction::SDiv: 1531 case Instruction::SRem: 1532 case Instruction::Shl: 1533 case Instruction::And: 1534 case Instruction::Or: 1535 case Instruction::Xor: { 1536 const MCExpr *LHS = lowerConstant(CE->getOperand(0), AP); 1537 const MCExpr *RHS = lowerConstant(CE->getOperand(1), AP); 1538 switch (CE->getOpcode()) { 1539 default: llvm_unreachable("Unknown binary operator constant cast expr"); 1540 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx); 1541 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx); 1542 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx); 1543 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx); 1544 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx); 1545 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx); 1546 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx); 1547 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx); 1548 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx); 1549 } 1550 } 1551 } 1552} 1553 1554static void emitGlobalConstantImpl(const Constant *C, unsigned AddrSpace, 1555 AsmPrinter &AP); 1556 1557/// isRepeatedByteSequence - Determine whether the given value is 1558/// composed of a repeated sequence of identical bytes and return the 1559/// byte value. If it is not a repeated sequence, return -1. 1560static int isRepeatedByteSequence(const ConstantDataSequential *V) { 1561 StringRef Data = V->getRawDataValues(); 1562 assert(!Data.empty() && "Empty aggregates should be CAZ node"); 1563 char C = Data[0]; 1564 for (unsigned i = 1, e = Data.size(); i != e; ++i) 1565 if (Data[i] != C) return -1; 1566 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1. 1567} 1568 1569 1570/// isRepeatedByteSequence - Determine whether the given value is 1571/// composed of a repeated sequence of identical bytes and return the 1572/// byte value. If it is not a repeated sequence, return -1. 1573static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) { 1574 1575 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) { 1576 if (CI->getBitWidth() > 64) return -1; 1577 1578 uint64_t Size = TM.getTargetData()->getTypeAllocSize(V->getType()); 1579 uint64_t Value = CI->getZExtValue(); 1580 1581 // Make sure the constant is at least 8 bits long and has a power 1582 // of 2 bit width. This guarantees the constant bit width is 1583 // always a multiple of 8 bits, avoiding issues with padding out 1584 // to Size and other such corner cases. 1585 if (CI->getBitWidth() < 8 || !isPowerOf2_64(CI->getBitWidth())) return -1; 1586 1587 uint8_t Byte = static_cast<uint8_t>(Value); 1588 1589 for (unsigned i = 1; i < Size; ++i) { 1590 Value >>= 8; 1591 if (static_cast<uint8_t>(Value) != Byte) return -1; 1592 } 1593 return Byte; 1594 } 1595 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) { 1596 // Make sure all array elements are sequences of the same repeated 1597 // byte. 1598 assert(CA->getNumOperands() != 0 && "Should be a CAZ"); 1599 int Byte = isRepeatedByteSequence(CA->getOperand(0), TM); 1600 if (Byte == -1) return -1; 1601 1602 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) { 1603 int ThisByte = isRepeatedByteSequence(CA->getOperand(i), TM); 1604 if (ThisByte == -1) return -1; 1605 if (Byte != ThisByte) return -1; 1606 } 1607 return Byte; 1608 } 1609 1610 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V)) 1611 return isRepeatedByteSequence(CDS); 1612 1613 return -1; 1614} 1615 1616static void emitGlobalConstantDataSequential(const ConstantDataSequential *CDS, 1617 unsigned AddrSpace,AsmPrinter &AP){ 1618 1619 // See if we can aggregate this into a .fill, if so, emit it as such. 1620 int Value = isRepeatedByteSequence(CDS, AP.TM); 1621 if (Value != -1) { 1622 uint64_t Bytes = AP.TM.getTargetData()->getTypeAllocSize(CDS->getType()); 1623 // Don't emit a 1-byte object as a .fill. 1624 if (Bytes > 1) 1625 return AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace); 1626 } 1627 1628 // If this can be emitted with .ascii/.asciz, emit it as such. 1629 if (CDS->isString()) 1630 return AP.OutStreamer.EmitBytes(CDS->getAsString(), AddrSpace); 1631 1632 // Otherwise, emit the values in successive locations. 1633 unsigned ElementByteSize = CDS->getElementByteSize(); 1634 if (isa<IntegerType>(CDS->getElementType())) { 1635 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 1636 if (AP.isVerbose()) 1637 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n", 1638 CDS->getElementAsInteger(i)); 1639 AP.OutStreamer.EmitIntValue(CDS->getElementAsInteger(i), 1640 ElementByteSize, AddrSpace); 1641 } 1642 } else if (ElementByteSize == 4) { 1643 // FP Constants are printed as integer constants to avoid losing 1644 // precision. 1645 assert(CDS->getElementType()->isFloatTy()); 1646 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 1647 union { 1648 float F; 1649 uint32_t I; 1650 }; 1651 1652 F = CDS->getElementAsFloat(i); 1653 if (AP.isVerbose()) 1654 AP.OutStreamer.GetCommentOS() << "float " << F << '\n'; 1655 AP.OutStreamer.EmitIntValue(I, 4, AddrSpace); 1656 } 1657 } else { 1658 assert(CDS->getElementType()->isDoubleTy()); 1659 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 1660 union { 1661 double F; 1662 uint64_t I; 1663 }; 1664 1665 F = CDS->getElementAsDouble(i); 1666 if (AP.isVerbose()) 1667 AP.OutStreamer.GetCommentOS() << "double " << F << '\n'; 1668 AP.OutStreamer.EmitIntValue(I, 8, AddrSpace); 1669 } 1670 } 1671 1672 const TargetData &TD = *AP.TM.getTargetData(); 1673 unsigned Size = TD.getTypeAllocSize(CDS->getType()); 1674 unsigned EmittedSize = TD.getTypeAllocSize(CDS->getType()->getElementType()) * 1675 CDS->getNumElements(); 1676 if (unsigned Padding = Size - EmittedSize) 1677 AP.OutStreamer.EmitZeros(Padding, AddrSpace); 1678 1679} 1680 1681static void emitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace, 1682 AsmPrinter &AP) { 1683 // See if we can aggregate some values. Make sure it can be 1684 // represented as a series of bytes of the constant value. 1685 int Value = isRepeatedByteSequence(CA, AP.TM); 1686 1687 if (Value != -1) { 1688 uint64_t Bytes = AP.TM.getTargetData()->getTypeAllocSize(CA->getType()); 1689 AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace); 1690 } 1691 else { 1692 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 1693 emitGlobalConstantImpl(CA->getOperand(i), AddrSpace, AP); 1694 } 1695} 1696 1697static void emitGlobalConstantVector(const ConstantVector *CV, 1698 unsigned AddrSpace, AsmPrinter &AP) { 1699 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i) 1700 emitGlobalConstantImpl(CV->getOperand(i), AddrSpace, AP); 1701 1702 const TargetData &TD = *AP.TM.getTargetData(); 1703 unsigned Size = TD.getTypeAllocSize(CV->getType()); 1704 unsigned EmittedSize = TD.getTypeAllocSize(CV->getType()->getElementType()) * 1705 CV->getType()->getNumElements(); 1706 if (unsigned Padding = Size - EmittedSize) 1707 AP.OutStreamer.EmitZeros(Padding, AddrSpace); 1708} 1709 1710static void emitGlobalConstantStruct(const ConstantStruct *CS, 1711 unsigned AddrSpace, AsmPrinter &AP) { 1712 // Print the fields in successive locations. Pad to align if needed! 1713 const TargetData *TD = AP.TM.getTargetData(); 1714 unsigned Size = TD->getTypeAllocSize(CS->getType()); 1715 const StructLayout *Layout = TD->getStructLayout(CS->getType()); 1716 uint64_t SizeSoFar = 0; 1717 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) { 1718 const Constant *Field = CS->getOperand(i); 1719 1720 // Check if padding is needed and insert one or more 0s. 1721 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType()); 1722 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1)) 1723 - Layout->getElementOffset(i)) - FieldSize; 1724 SizeSoFar += FieldSize + PadSize; 1725 1726 // Now print the actual field value. 1727 emitGlobalConstantImpl(Field, AddrSpace, AP); 1728 1729 // Insert padding - this may include padding to increase the size of the 1730 // current field up to the ABI size (if the struct is not packed) as well 1731 // as padding to ensure that the next field starts at the right offset. 1732 AP.OutStreamer.EmitZeros(PadSize, AddrSpace); 1733 } 1734 assert(SizeSoFar == Layout->getSizeInBytes() && 1735 "Layout of constant struct may be incorrect!"); 1736} 1737 1738static void emitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace, 1739 AsmPrinter &AP) { 1740 if (CFP->getType()->isHalfTy()) { 1741 if (AP.isVerbose()) { 1742 SmallString<10> Str; 1743 CFP->getValueAPF().toString(Str); 1744 AP.OutStreamer.GetCommentOS() << "half " << Str << '\n'; 1745 } 1746 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1747 AP.OutStreamer.EmitIntValue(Val, 2, AddrSpace); 1748 return; 1749 } 1750 1751 if (CFP->getType()->isFloatTy()) { 1752 if (AP.isVerbose()) { 1753 float Val = CFP->getValueAPF().convertToFloat(); 1754 uint64_t IntVal = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1755 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n' 1756 << " (" << format("0x%x", IntVal) << ")\n"; 1757 } 1758 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1759 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace); 1760 return; 1761 } 1762 1763 // FP Constants are printed as integer constants to avoid losing 1764 // precision. 1765 if (CFP->getType()->isDoubleTy()) { 1766 if (AP.isVerbose()) { 1767 double Val = CFP->getValueAPF().convertToDouble(); 1768 uint64_t IntVal = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1769 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n' 1770 << " (" << format("0x%lx", IntVal) << ")\n"; 1771 } 1772 1773 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1774 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 1775 return; 1776 } 1777 1778 if (CFP->getType()->isX86_FP80Ty()) { 1779 // all long double variants are printed as hex 1780 // API needed to prevent premature destruction 1781 APInt API = CFP->getValueAPF().bitcastToAPInt(); 1782 const uint64_t *p = API.getRawData(); 1783 if (AP.isVerbose()) { 1784 // Convert to double so we can print the approximate val as a comment. 1785 APFloat DoubleVal = CFP->getValueAPF(); 1786 bool ignored; 1787 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 1788 &ignored); 1789 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= " 1790 << DoubleVal.convertToDouble() << '\n'; 1791 } 1792 1793 if (AP.TM.getTargetData()->isBigEndian()) { 1794 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 1795 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1796 } else { 1797 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1798 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 1799 } 1800 1801 // Emit the tail padding for the long double. 1802 const TargetData &TD = *AP.TM.getTargetData(); 1803 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) - 1804 TD.getTypeStoreSize(CFP->getType()), AddrSpace); 1805 return; 1806 } 1807 1808 assert(CFP->getType()->isPPC_FP128Ty() && 1809 "Floating point constant type not handled"); 1810 // All long double variants are printed as hex 1811 // API needed to prevent premature destruction. 1812 APInt API = CFP->getValueAPF().bitcastToAPInt(); 1813 const uint64_t *p = API.getRawData(); 1814 if (AP.TM.getTargetData()->isBigEndian()) { 1815 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1816 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 1817 } else { 1818 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 1819 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1820 } 1821} 1822 1823static void emitGlobalConstantLargeInt(const ConstantInt *CI, 1824 unsigned AddrSpace, AsmPrinter &AP) { 1825 const TargetData *TD = AP.TM.getTargetData(); 1826 unsigned BitWidth = CI->getBitWidth(); 1827 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits"); 1828 1829 // We don't expect assemblers to support integer data directives 1830 // for more than 64 bits, so we emit the data in at most 64-bit 1831 // quantities at a time. 1832 const uint64_t *RawData = CI->getValue().getRawData(); 1833 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1834 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i]; 1835 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 1836 } 1837} 1838 1839static void emitGlobalConstantImpl(const Constant *CV, unsigned AddrSpace, 1840 AsmPrinter &AP) { 1841 const TargetData *TD = AP.TM.getTargetData(); 1842 uint64_t Size = TD->getTypeAllocSize(CV->getType()); 1843 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) 1844 return AP.OutStreamer.EmitZeros(Size, AddrSpace); 1845 1846 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1847 switch (Size) { 1848 case 1: 1849 case 2: 1850 case 4: 1851 case 8: 1852 if (AP.isVerbose()) 1853 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n", 1854 CI->getZExtValue()); 1855 AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace); 1856 return; 1857 default: 1858 emitGlobalConstantLargeInt(CI, AddrSpace, AP); 1859 return; 1860 } 1861 } 1862 1863 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) 1864 return emitGlobalConstantFP(CFP, AddrSpace, AP); 1865 1866 if (isa<ConstantPointerNull>(CV)) { 1867 AP.OutStreamer.EmitIntValue(0, Size, AddrSpace); 1868 return; 1869 } 1870 1871 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV)) 1872 return emitGlobalConstantDataSequential(CDS, AddrSpace, AP); 1873 1874 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) 1875 return emitGlobalConstantArray(CVA, AddrSpace, AP); 1876 1877 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) 1878 return emitGlobalConstantStruct(CVS, AddrSpace, AP); 1879 1880 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { 1881 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of 1882 // vectors). 1883 if (CE->getOpcode() == Instruction::BitCast) 1884 return emitGlobalConstantImpl(CE->getOperand(0), AddrSpace, AP); 1885 1886 if (Size > 8) { 1887 // If the constant expression's size is greater than 64-bits, then we have 1888 // to emit the value in chunks. Try to constant fold the value and emit it 1889 // that way. 1890 Constant *New = ConstantFoldConstantExpression(CE, TD); 1891 if (New && New != CE) 1892 return emitGlobalConstantImpl(New, AddrSpace, AP); 1893 } 1894 } 1895 1896 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV)) 1897 return emitGlobalConstantVector(V, AddrSpace, AP); 1898 1899 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it 1900 // thread the streamer with EmitValue. 1901 AP.OutStreamer.EmitValue(lowerConstant(CV, AP), Size, AddrSpace); 1902} 1903 1904/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 1905void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { 1906 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1907 if (Size) 1908 emitGlobalConstantImpl(CV, AddrSpace, *this); 1909 else if (MAI->hasSubsectionsViaSymbols()) { 1910 // If the global has zero size, emit a single byte so that two labels don't 1911 // look like they are at the same location. 1912 OutStreamer.EmitIntValue(0, 1, AddrSpace); 1913 } 1914} 1915 1916void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1917 // Target doesn't support this yet! 1918 llvm_unreachable("Target does not support EmitMachineConstantPoolValue"); 1919} 1920 1921void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const { 1922 if (Offset > 0) 1923 OS << '+' << Offset; 1924 else if (Offset < 0) 1925 OS << Offset; 1926} 1927 1928//===----------------------------------------------------------------------===// 1929// Symbol Lowering Routines. 1930//===----------------------------------------------------------------------===// 1931 1932/// GetTempSymbol - Return the MCSymbol corresponding to the assembler 1933/// temporary label with the specified stem and unique ID. 1934MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const { 1935 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + 1936 Name + Twine(ID)); 1937} 1938 1939/// GetTempSymbol - Return an assembler temporary label with the specified 1940/// stem. 1941MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const { 1942 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+ 1943 Name); 1944} 1945 1946 1947MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const { 1948 return MMI->getAddrLabelSymbol(BA->getBasicBlock()); 1949} 1950 1951MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const { 1952 return MMI->getAddrLabelSymbol(BB); 1953} 1954 1955/// GetCPISymbol - Return the symbol for the specified constant pool entry. 1956MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const { 1957 return OutContext.GetOrCreateSymbol 1958 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber()) 1959 + "_" + Twine(CPID)); 1960} 1961 1962/// GetJTISymbol - Return the symbol for the specified jump table entry. 1963MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const { 1964 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate); 1965} 1966 1967/// GetJTSetSymbol - Return the symbol for the specified jump table .set 1968/// FIXME: privatize to AsmPrinter. 1969MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const { 1970 return OutContext.GetOrCreateSymbol 1971 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" + 1972 Twine(UID) + "_set_" + Twine(MBBID)); 1973} 1974 1975/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with 1976/// global value name as its base, with the specified suffix, and where the 1977/// symbol is forced to have private linkage if ForcePrivate is true. 1978MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV, 1979 StringRef Suffix, 1980 bool ForcePrivate) const { 1981 SmallString<60> NameStr; 1982 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate); 1983 NameStr.append(Suffix.begin(), Suffix.end()); 1984 return OutContext.GetOrCreateSymbol(NameStr.str()); 1985} 1986 1987/// GetExternalSymbolSymbol - Return the MCSymbol for the specified 1988/// ExternalSymbol. 1989MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const { 1990 SmallString<60> NameStr; 1991 Mang->getNameWithPrefix(NameStr, Sym); 1992 return OutContext.GetOrCreateSymbol(NameStr.str()); 1993} 1994 1995 1996 1997/// PrintParentLoopComment - Print comments about parent loops of this one. 1998static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1999 unsigned FunctionNumber) { 2000 if (Loop == 0) return; 2001 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber); 2002 OS.indent(Loop->getLoopDepth()*2) 2003 << "Parent Loop BB" << FunctionNumber << "_" 2004 << Loop->getHeader()->getNumber() 2005 << " Depth=" << Loop->getLoopDepth() << '\n'; 2006} 2007 2008 2009/// PrintChildLoopComment - Print comments about child loops within 2010/// the loop for this basic block, with nesting. 2011static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop, 2012 unsigned FunctionNumber) { 2013 // Add child loop information 2014 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){ 2015 OS.indent((*CL)->getLoopDepth()*2) 2016 << "Child Loop BB" << FunctionNumber << "_" 2017 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth() 2018 << '\n'; 2019 PrintChildLoopComment(OS, *CL, FunctionNumber); 2020 } 2021} 2022 2023/// emitBasicBlockLoopComments - Pretty-print comments for basic blocks. 2024static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB, 2025 const MachineLoopInfo *LI, 2026 const AsmPrinter &AP) { 2027 // Add loop depth information 2028 const MachineLoop *Loop = LI->getLoopFor(&MBB); 2029 if (Loop == 0) return; 2030 2031 MachineBasicBlock *Header = Loop->getHeader(); 2032 assert(Header && "No header for loop"); 2033 2034 // If this block is not a loop header, just print out what is the loop header 2035 // and return. 2036 if (Header != &MBB) { 2037 AP.OutStreamer.AddComment(" in Loop: Header=BB" + 2038 Twine(AP.getFunctionNumber())+"_" + 2039 Twine(Loop->getHeader()->getNumber())+ 2040 " Depth="+Twine(Loop->getLoopDepth())); 2041 return; 2042 } 2043 2044 // Otherwise, it is a loop header. Print out information about child and 2045 // parent loops. 2046 raw_ostream &OS = AP.OutStreamer.GetCommentOS(); 2047 2048 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber()); 2049 2050 OS << "=>"; 2051 OS.indent(Loop->getLoopDepth()*2-2); 2052 2053 OS << "This "; 2054 if (Loop->empty()) 2055 OS << "Inner "; 2056 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n'; 2057 2058 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber()); 2059} 2060 2061 2062/// EmitBasicBlockStart - This method prints the label for the specified 2063/// MachineBasicBlock, an alignment (if present) and a comment describing 2064/// it if appropriate. 2065void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { 2066 // Emit an alignment directive for this block, if needed. 2067 if (unsigned Align = MBB->getAlignment()) 2068 EmitAlignment(Align); 2069 2070 // If the block has its address taken, emit any labels that were used to 2071 // reference the block. It is possible that there is more than one label 2072 // here, because multiple LLVM BB's may have been RAUW'd to this block after 2073 // the references were generated. 2074 if (MBB->hasAddressTaken()) { 2075 const BasicBlock *BB = MBB->getBasicBlock(); 2076 if (isVerbose()) 2077 OutStreamer.AddComment("Block address taken"); 2078 2079 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB); 2080 2081 for (unsigned i = 0, e = Syms.size(); i != e; ++i) 2082 OutStreamer.EmitLabel(Syms[i]); 2083 } 2084 2085 // Print some verbose block comments. 2086 if (isVerbose()) { 2087 if (const BasicBlock *BB = MBB->getBasicBlock()) 2088 if (BB->hasName()) 2089 OutStreamer.AddComment("%" + BB->getName()); 2090 emitBasicBlockLoopComments(*MBB, LI, *this); 2091 } 2092 2093 // Print the main label for the block. 2094 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) { 2095 if (isVerbose() && OutStreamer.hasRawTextSupport()) { 2096 // NOTE: Want this comment at start of line, don't emit with AddComment. 2097 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" + 2098 Twine(MBB->getNumber()) + ":"); 2099 } 2100 } else { 2101 OutStreamer.EmitLabel(MBB->getSymbol()); 2102 } 2103} 2104 2105void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility, 2106 bool IsDefinition) const { 2107 MCSymbolAttr Attr = MCSA_Invalid; 2108 2109 switch (Visibility) { 2110 default: break; 2111 case GlobalValue::HiddenVisibility: 2112 if (IsDefinition) 2113 Attr = MAI->getHiddenVisibilityAttr(); 2114 else 2115 Attr = MAI->getHiddenDeclarationVisibilityAttr(); 2116 break; 2117 case GlobalValue::ProtectedVisibility: 2118 Attr = MAI->getProtectedVisibilityAttr(); 2119 break; 2120 } 2121 2122 if (Attr != MCSA_Invalid) 2123 OutStreamer.EmitSymbolAttribute(Sym, Attr); 2124} 2125 2126/// isBlockOnlyReachableByFallthough - Return true if the basic block has 2127/// exactly one predecessor and the control transfer mechanism between 2128/// the predecessor and this block is a fall-through. 2129bool AsmPrinter:: 2130isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const { 2131 // If this is a landing pad, it isn't a fall through. If it has no preds, 2132 // then nothing falls through to it. 2133 if (MBB->isLandingPad() || MBB->pred_empty()) 2134 return false; 2135 2136 // If there isn't exactly one predecessor, it can't be a fall through. 2137 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI; 2138 ++PI2; 2139 if (PI2 != MBB->pred_end()) 2140 return false; 2141 2142 // The predecessor has to be immediately before this block. 2143 MachineBasicBlock *Pred = *PI; 2144 2145 if (!Pred->isLayoutSuccessor(MBB)) 2146 return false; 2147 2148 // If the block is completely empty, then it definitely does fall through. 2149 if (Pred->empty()) 2150 return true; 2151 2152 // Check the terminators in the previous blocks 2153 for (MachineBasicBlock::iterator II = Pred->getFirstTerminator(), 2154 IE = Pred->end(); II != IE; ++II) { 2155 MachineInstr &MI = *II; 2156 2157 // If it is not a simple branch, we are in a table somewhere. 2158 if (!MI.isBranch() || MI.isIndirectBranch()) 2159 return false; 2160 2161 // If we are the operands of one of the branches, this is not 2162 // a fall through. 2163 for (MachineInstr::mop_iterator OI = MI.operands_begin(), 2164 OE = MI.operands_end(); OI != OE; ++OI) { 2165 const MachineOperand& OP = *OI; 2166 if (OP.isJTI()) 2167 return false; 2168 if (OP.isMBB() && OP.getMBB() == MBB) 2169 return false; 2170 } 2171 } 2172 2173 return true; 2174} 2175 2176 2177 2178GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 2179 if (!S->usesMetadata()) 2180 return 0; 2181 2182 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters); 2183 gcp_map_type::iterator GCPI = GCMap.find(S); 2184 if (GCPI != GCMap.end()) 2185 return GCPI->second; 2186 2187 const char *Name = S->getName().c_str(); 2188 2189 for (GCMetadataPrinterRegistry::iterator 2190 I = GCMetadataPrinterRegistry::begin(), 2191 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 2192 if (strcmp(Name, I->getName()) == 0) { 2193 GCMetadataPrinter *GMP = I->instantiate(); 2194 GMP->S = S; 2195 GCMap.insert(std::make_pair(S, GMP)); 2196 return GMP; 2197 } 2198 2199 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name)); 2200} 2201