AsmPrinter.cpp revision 1f8c8922b2629e1033fee97d8daf779e497d561d
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#include "llvm/CodeGen/AsmPrinter.h" 15#include "llvm/Assembly/Writer.h" 16#include "llvm/DerivedTypes.h" 17#include "llvm/Constants.h" 18#include "llvm/Module.h" 19#include "llvm/CodeGen/DwarfWriter.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/DebugInfo.h" 28#include "llvm/MC/MCContext.h" 29#include "llvm/MC/MCExpr.h" 30#include "llvm/MC/MCInst.h" 31#include "llvm/MC/MCSection.h" 32#include "llvm/MC/MCStreamer.h" 33#include "llvm/MC/MCSymbol.h" 34#include "llvm/Support/CommandLine.h" 35#include "llvm/Support/ErrorHandling.h" 36#include "llvm/Support/Format.h" 37#include "llvm/Support/FormattedStream.h" 38#include "llvm/MC/MCAsmInfo.h" 39#include "llvm/Target/Mangler.h" 40#include "llvm/Target/TargetData.h" 41#include "llvm/Target/TargetInstrInfo.h" 42#include "llvm/Target/TargetLowering.h" 43#include "llvm/Target/TargetLoweringObjectFile.h" 44#include "llvm/Target/TargetOptions.h" 45#include "llvm/Target/TargetRegisterInfo.h" 46#include "llvm/ADT/SmallPtrSet.h" 47#include "llvm/ADT/SmallString.h" 48#include <cerrno> 49using namespace llvm; 50 51static cl::opt<cl::boolOrDefault> 52AsmVerbose("asm-verbose", cl::desc("Add comments to directives."), 53 cl::init(cl::BOU_UNSET)); 54 55static bool getVerboseAsm(bool VDef) { 56 switch (AsmVerbose) { 57 default: 58 case cl::BOU_UNSET: return VDef; 59 case cl::BOU_TRUE: return true; 60 case cl::BOU_FALSE: return false; 61 } 62} 63 64char AsmPrinter::ID = 0; 65AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm, 66 const MCAsmInfo *T, bool VDef) 67 : MachineFunctionPass(&ID), FunctionNumber(0), O(o), 68 TM(tm), MAI(T), TRI(tm.getRegisterInfo()), 69 70 OutContext(*new MCContext()), 71 // FIXME: Pass instprinter to streamer. 72 OutStreamer(*createAsmStreamer(OutContext, O, *T, 73 TM.getTargetData()->isLittleEndian(), 74 getVerboseAsm(VDef), 0)), 75 76 LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) { 77 DW = 0; MMI = 0; 78 VerboseAsm = getVerboseAsm(VDef); 79} 80 81AsmPrinter::~AsmPrinter() { 82 for (gcp_iterator I = GCMetadataPrinters.begin(), 83 E = GCMetadataPrinters.end(); I != E; ++I) 84 delete I->second; 85 86 delete &OutStreamer; 87 delete &OutContext; 88} 89 90TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const { 91 return TM.getTargetLowering()->getObjFileLowering(); 92} 93 94/// getCurrentSection() - Return the current section we are emitting to. 95const MCSection *AsmPrinter::getCurrentSection() const { 96 return OutStreamer.getCurrentSection(); 97} 98 99 100void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { 101 AU.setPreservesAll(); 102 MachineFunctionPass::getAnalysisUsage(AU); 103 AU.addRequired<GCModuleInfo>(); 104 if (VerboseAsm) 105 AU.addRequired<MachineLoopInfo>(); 106} 107 108bool AsmPrinter::doInitialization(Module &M) { 109 // Initialize TargetLoweringObjectFile. 110 const_cast<TargetLoweringObjectFile&>(getObjFileLowering()) 111 .Initialize(OutContext, TM); 112 113 Mang = new Mangler(*MAI); 114 115 // Allow the target to emit any magic that it wants at the start of the file. 116 EmitStartOfAsmFile(M); 117 118 // Very minimal debug info. It is ignored if we emit actual debug info. If we 119 // don't, this at least helps the user find where a global came from. 120 if (MAI->hasSingleParameterDotFile()) { 121 // .file "foo.c" 122 OutStreamer.EmitFileDirective(M.getModuleIdentifier()); 123 } 124 125 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 126 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 127 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 128 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 129 MP->beginAssembly(O, *this, *MAI); 130 131 if (!M.getModuleInlineAsm().empty()) 132 O << MAI->getCommentString() << " Start of file scope inline assembly\n" 133 << M.getModuleInlineAsm() 134 << '\n' << MAI->getCommentString() 135 << " End of file scope inline assembly\n"; 136 137 MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 138 if (MMI) 139 MMI->AnalyzeModule(M); 140 DW = getAnalysisIfAvailable<DwarfWriter>(); 141 if (DW) 142 DW->BeginModule(&M, MMI, O, this, MAI); 143 144 return false; 145} 146 147/// EmitGlobalVariable - Emit the specified global variable to the .s file. 148void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { 149 if (!GV->hasInitializer()) // External globals require no code. 150 return; 151 152 // Check to see if this is a special global used by LLVM, if so, emit it. 153 if (EmitSpecialLLVMGlobal(GV)) 154 return; 155 156 MCSymbol *GVSym = GetGlobalValueSymbol(GV); 157 printVisibility(GVSym, GV->getVisibility()); 158 159 if (MAI->hasDotTypeDotSizeDirective()) 160 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject); 161 162 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM); 163 164 const TargetData *TD = TM.getTargetData(); 165 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType()); 166 unsigned AlignLog = TD->getPreferredAlignmentLog(GV); 167 168 // Handle common and BSS local symbols (.lcomm). 169 if (GVKind.isCommon() || GVKind.isBSSLocal()) { 170 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 171 172 if (VerboseAsm) { 173 WriteAsOperand(OutStreamer.GetCommentOS(), GV, 174 /*PrintType=*/false, GV->getParent()); 175 OutStreamer.GetCommentOS() << '\n'; 176 } 177 178 // Handle common symbols. 179 if (GVKind.isCommon()) { 180 // .comm _foo, 42, 4 181 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 182 return; 183 } 184 185 // Handle local BSS symbols. 186 if (MAI->hasMachoZeroFillDirective()) { 187 const MCSection *TheSection = 188 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 189 // .zerofill __DATA, __bss, _foo, 400, 5 190 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 191 return; 192 } 193 194 if (MAI->hasLCOMMDirective()) { 195 // .lcomm _foo, 42 196 OutStreamer.EmitLocalCommonSymbol(GVSym, Size); 197 return; 198 } 199 200 // .local _foo 201 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local); 202 // .comm _foo, 42, 4 203 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 204 return; 205 } 206 207 const MCSection *TheSection = 208 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 209 210 // Handle the zerofill directive on darwin, which is a special form of BSS 211 // emission. 212 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) { 213 // .globl _foo 214 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 215 // .zerofill __DATA, __common, _foo, 400, 5 216 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 217 return; 218 } 219 220 OutStreamer.SwitchSection(TheSection); 221 222 // TODO: Factor into an 'emit linkage' thing that is shared with function 223 // bodies. 224 switch (GV->getLinkage()) { 225 case GlobalValue::CommonLinkage: 226 case GlobalValue::LinkOnceAnyLinkage: 227 case GlobalValue::LinkOnceODRLinkage: 228 case GlobalValue::WeakAnyLinkage: 229 case GlobalValue::WeakODRLinkage: 230 case GlobalValue::LinkerPrivateLinkage: 231 if (MAI->getWeakDefDirective() != 0) { 232 // .globl _foo 233 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 234 // .weak_definition _foo 235 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition); 236 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) { 237 // .globl _foo 238 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 239 // FIXME: linkonce should be a section attribute, handled by COFF Section 240 // assignment. 241 // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce 242 // .linkonce same_size 243 O << LinkOnce; 244 } else { 245 // .weak _foo 246 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak); 247 } 248 break; 249 case GlobalValue::DLLExportLinkage: 250 case GlobalValue::AppendingLinkage: 251 // FIXME: appending linkage variables should go into a section of 252 // their name or something. For now, just emit them as external. 253 case GlobalValue::ExternalLinkage: 254 // If external or appending, declare as a global symbol. 255 // .globl _foo 256 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 257 break; 258 case GlobalValue::PrivateLinkage: 259 case GlobalValue::InternalLinkage: 260 break; 261 default: 262 llvm_unreachable("Unknown linkage type!"); 263 } 264 265 EmitAlignment(AlignLog, GV); 266 if (VerboseAsm) { 267 WriteAsOperand(OutStreamer.GetCommentOS(), GV, 268 /*PrintType=*/false, GV->getParent()); 269 OutStreamer.GetCommentOS() << '\n'; 270 } 271 OutStreamer.EmitLabel(GVSym); 272 273 EmitGlobalConstant(GV->getInitializer()); 274 275 if (MAI->hasDotTypeDotSizeDirective()) 276 // .size foo, 42 277 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext)); 278 279 OutStreamer.AddBlankLine(); 280} 281 282 283bool AsmPrinter::doFinalization(Module &M) { 284 // Emit global variables. 285 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 286 I != E; ++I) 287 EmitGlobalVariable(I); 288 289 // Emit final debug information. 290 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling()) 291 DW->EndModule(); 292 293 // If the target wants to know about weak references, print them all. 294 if (MAI->getWeakRefDirective()) { 295 // FIXME: This is not lazy, it would be nice to only print weak references 296 // to stuff that is actually used. Note that doing so would require targets 297 // to notice uses in operands (due to constant exprs etc). This should 298 // happen with the MC stuff eventually. 299 300 // Print out module-level global variables here. 301 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 302 I != E; ++I) { 303 if (!I->hasExternalWeakLinkage()) continue; 304 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I), 305 MCSA_WeakReference); 306 } 307 308 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) { 309 if (!I->hasExternalWeakLinkage()) continue; 310 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I), 311 MCSA_WeakReference); 312 } 313 } 314 315 if (MAI->getSetDirective()) { 316 OutStreamer.AddBlankLine(); 317 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 318 I != E; ++I) { 319 MCSymbol *Name = GetGlobalValueSymbol(I); 320 321 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 322 MCSymbol *Target = GetGlobalValueSymbol(GV); 323 324 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective()) 325 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global); 326 else if (I->hasWeakLinkage()) 327 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference); 328 else 329 assert(I->hasLocalLinkage() && "Invalid alias linkage"); 330 331 printVisibility(Name, I->getVisibility()); 332 333 O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n'; 334 } 335 } 336 337 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 338 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 339 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 340 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 341 MP->finishAssembly(O, *this, *MAI); 342 343 // If we don't have any trampolines, then we don't require stack memory 344 // to be executable. Some targets have a directive to declare this. 345 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 346 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 347 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext)) 348 OutStreamer.SwitchSection(S); 349 350 // Allow the target to emit any magic that it wants at the end of the file, 351 // after everything else has gone out. 352 EmitEndOfAsmFile(M); 353 354 delete Mang; Mang = 0; 355 DW = 0; MMI = 0; 356 357 OutStreamer.Finish(); 358 return false; 359} 360 361void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 362 // Get the function symbol. 363 CurrentFnSym = GetGlobalValueSymbol(MF.getFunction()); 364 IncrementFunctionNumber(); 365 366 if (VerboseAsm) 367 LI = &getAnalysis<MachineLoopInfo>(); 368} 369 370namespace { 371 // SectionCPs - Keep track the alignment, constpool entries per Section. 372 struct SectionCPs { 373 const MCSection *S; 374 unsigned Alignment; 375 SmallVector<unsigned, 4> CPEs; 376 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {} 377 }; 378} 379 380/// EmitConstantPool - Print to the current output stream assembly 381/// representations of the constants in the constant pool MCP. This is 382/// used to print out constants which have been "spilled to memory" by 383/// the code generator. 384/// 385void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) { 386 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 387 if (CP.empty()) return; 388 389 // Calculate sections for constant pool entries. We collect entries to go into 390 // the same section together to reduce amount of section switch statements. 391 SmallVector<SectionCPs, 4> CPSections; 392 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 393 const MachineConstantPoolEntry &CPE = CP[i]; 394 unsigned Align = CPE.getAlignment(); 395 396 SectionKind Kind; 397 switch (CPE.getRelocationInfo()) { 398 default: llvm_unreachable("Unknown section kind"); 399 case 2: Kind = SectionKind::getReadOnlyWithRel(); break; 400 case 1: 401 Kind = SectionKind::getReadOnlyWithRelLocal(); 402 break; 403 case 0: 404 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) { 405 case 4: Kind = SectionKind::getMergeableConst4(); break; 406 case 8: Kind = SectionKind::getMergeableConst8(); break; 407 case 16: Kind = SectionKind::getMergeableConst16();break; 408 default: Kind = SectionKind::getMergeableConst(); break; 409 } 410 } 411 412 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind); 413 414 // The number of sections are small, just do a linear search from the 415 // last section to the first. 416 bool Found = false; 417 unsigned SecIdx = CPSections.size(); 418 while (SecIdx != 0) { 419 if (CPSections[--SecIdx].S == S) { 420 Found = true; 421 break; 422 } 423 } 424 if (!Found) { 425 SecIdx = CPSections.size(); 426 CPSections.push_back(SectionCPs(S, Align)); 427 } 428 429 if (Align > CPSections[SecIdx].Alignment) 430 CPSections[SecIdx].Alignment = Align; 431 CPSections[SecIdx].CPEs.push_back(i); 432 } 433 434 // Now print stuff into the calculated sections. 435 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) { 436 OutStreamer.SwitchSection(CPSections[i].S); 437 EmitAlignment(Log2_32(CPSections[i].Alignment)); 438 439 unsigned Offset = 0; 440 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) { 441 unsigned CPI = CPSections[i].CPEs[j]; 442 MachineConstantPoolEntry CPE = CP[CPI]; 443 444 // Emit inter-object padding for alignment. 445 unsigned AlignMask = CPE.getAlignment() - 1; 446 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask; 447 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/); 448 449 const Type *Ty = CPE.getType(); 450 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty); 451 452 // Emit the label with a comment on it. 453 if (VerboseAsm) { 454 OutStreamer.GetCommentOS() << "constant pool "; 455 WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(), 456 MF->getFunction()->getParent()); 457 OutStreamer.GetCommentOS() << '\n'; 458 } 459 OutStreamer.EmitLabel(GetCPISymbol(CPI)); 460 461 if (CPE.isMachineConstantPoolEntry()) 462 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); 463 else 464 EmitGlobalConstant(CPE.Val.ConstVal); 465 } 466 } 467} 468 469/// EmitJumpTableInfo - Print assembly representations of the jump tables used 470/// by the current function to the current output stream. 471/// 472void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) { 473 MachineJumpTableInfo *MJTI = MF.getJumpTableInfo(); 474 if (MJTI == 0) return; 475 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 476 if (JT.empty()) return; 477 478 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 479 480 // Pick the directive to use to print the jump table entries, and switch to 481 // the appropriate section. 482 TargetLowering *LoweringInfo = TM.getTargetLowering(); 483 484 const Function *F = MF.getFunction(); 485 bool JTInDiffSection = false; 486 if (F->isWeakForLinker() || 487 (IsPic && !LoweringInfo->usesGlobalOffsetTable())) { 488 // In PIC mode, we need to emit the jump table to the same section as the 489 // function body itself, otherwise the label differences won't make sense. 490 // We should also do if the section name is NULL or function is declared in 491 // discardable section. 492 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, 493 TM)); 494 } else { 495 // Otherwise, drop it in the readonly section. 496 const MCSection *ReadOnlySection = 497 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly()); 498 OutStreamer.SwitchSection(ReadOnlySection); 499 JTInDiffSection = true; 500 } 501 502 EmitAlignment(Log2_32(MJTI->getAlignment())); 503 504 for (unsigned i = 0, e = JT.size(); i != e; ++i) { 505 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; 506 507 // If this jump table was deleted, ignore it. 508 if (JTBBs.empty()) continue; 509 510 // For PIC codegen, if possible we want to use the SetDirective to reduce 511 // the number of relocations the assembler will generate for the jump table. 512 // Set directives are all printed before the jump table itself. 513 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; 514 if (MAI->getSetDirective() && IsPic) 515 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 516 if (EmittedSets.insert(JTBBs[ii])) 517 printPICJumpTableSetLabel(i, JTBBs[ii]); 518 519 // On some targets (e.g. Darwin) we want to emit two consequtive labels 520 // before each jump table. The first label is never referenced, but tells 521 // the assembler and linker the extents of the jump table object. The 522 // second label is actually referenced by the code. 523 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) 524 OutStreamer.EmitLabel(GetJTISymbol(i, true)); 525 526 OutStreamer.EmitLabel(GetJTISymbol(i)); 527 528 if (!IsPic) { 529 // In non-pic mode, the entries in the jump table are direct references 530 // to the basic blocks. 531 unsigned EntrySize = MJTI->getEntrySize(); 532 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 533 MCSymbol *MBBSym = GetMBBSymbol(JTBBs[ii]->getNumber()); 534 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MBBSym, OutContext), 535 EntrySize, /*addrspace*/0); 536 } 537 } else { 538 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 539 printPICJumpTableEntry(MJTI, JTBBs[ii], i); 540 } 541 } 542} 543 544void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, 545 const MachineBasicBlock *MBB, 546 unsigned uid) const { 547 // If the target supports GPRel, use it. 548 if (MAI->getGPRel32Directive() != 0) { 549 MCSymbol *MBBSym = GetMBBSymbol(MBB->getNumber()); 550 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext)); 551 return; 552 } 553 554 // If we have emitted set directives for the jump table entries, print 555 // them rather than the entries themselves. If we're emitting PIC, then 556 // emit the table entries as differences between two text section labels. 557 const MCExpr *Val; 558 if (MAI->getSetDirective()) { 559 // If we used .set, reference the .set's symbol. 560 Val = MCSymbolRefExpr::Create(GetJTSetSymbol(uid, MBB->getNumber()), 561 OutContext); 562 } else { 563 // Otherwise, use the difference as the jump table entry. 564 Val = MCSymbolRefExpr::Create(GetMBBSymbol(MBB->getNumber()), OutContext); 565 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(uid), OutContext); 566 Val = MCBinaryExpr::CreateSub(Val, JTI, OutContext); 567 } 568 569 OutStreamer.EmitValue(Val, MJTI->getEntrySize(), /*addrspace*/0); 570} 571 572 573/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 574/// special global used by LLVM. If so, emit it and return true, otherwise 575/// do nothing and return false. 576bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 577 if (GV->getName() == "llvm.used") { 578 if (MAI->hasNoDeadStrip()) // No need to emit this at all. 579 EmitLLVMUsedList(GV->getInitializer()); 580 return true; 581 } 582 583 // Ignore debug and non-emitted data. This handles llvm.compiler.used. 584 if (GV->getSection() == "llvm.metadata" || 585 GV->hasAvailableExternallyLinkage()) 586 return true; 587 588 if (!GV->hasAppendingLinkage()) return false; 589 590 assert(GV->hasInitializer() && "Not a special LLVM global!"); 591 592 const TargetData *TD = TM.getTargetData(); 593 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 594 if (GV->getName() == "llvm.global_ctors") { 595 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection()); 596 EmitAlignment(Align, 0); 597 EmitXXStructorList(GV->getInitializer()); 598 599 if (TM.getRelocationModel() == Reloc::Static && 600 MAI->hasStaticCtorDtorReferenceInStaticMode()) { 601 StringRef Sym(".constructors_used"); 602 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 603 MCSA_Reference); 604 } 605 return true; 606 } 607 608 if (GV->getName() == "llvm.global_dtors") { 609 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection()); 610 EmitAlignment(Align, 0); 611 EmitXXStructorList(GV->getInitializer()); 612 613 if (TM.getRelocationModel() == Reloc::Static && 614 MAI->hasStaticCtorDtorReferenceInStaticMode()) { 615 StringRef Sym(".destructors_used"); 616 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 617 MCSA_Reference); 618 } 619 return true; 620 } 621 622 return false; 623} 624 625/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each 626/// global in the specified llvm.used list for which emitUsedDirectiveFor 627/// is true, as being used with this directive. 628void AsmPrinter::EmitLLVMUsedList(Constant *List) { 629 // Should be an array of 'i8*'. 630 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 631 if (InitList == 0) return; 632 633 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 634 const GlobalValue *GV = 635 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts()); 636 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) 637 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV), 638 MCSA_NoDeadStrip); 639 } 640} 641 642/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 643/// function pointers, ignoring the init priority. 644void AsmPrinter::EmitXXStructorList(Constant *List) { 645 // Should be an array of '{ int, void ()* }' structs. The first value is the 646 // init priority, which we ignore. 647 if (!isa<ConstantArray>(List)) return; 648 ConstantArray *InitList = cast<ConstantArray>(List); 649 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 650 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 651 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 652 653 if (CS->getOperand(1)->isNullValue()) 654 return; // Found a null terminator, exit printing. 655 // Emit the function pointer. 656 EmitGlobalConstant(CS->getOperand(1)); 657 } 658} 659 660//===--------------------------------------------------------------------===// 661// Emission and print routines 662// 663 664/// EmitInt8 - Emit a byte directive and value. 665/// 666void AsmPrinter::EmitInt8(int Value) const { 667 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/); 668} 669 670/// EmitInt16 - Emit a short directive and value. 671/// 672void AsmPrinter::EmitInt16(int Value) const { 673 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/); 674} 675 676/// EmitInt32 - Emit a long directive and value. 677/// 678void AsmPrinter::EmitInt32(int Value) const { 679 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/); 680} 681 682/// EmitInt64 - Emit a long long directive and value. 683/// 684void AsmPrinter::EmitInt64(uint64_t Value) const { 685 OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/); 686} 687 688//===----------------------------------------------------------------------===// 689 690// EmitAlignment - Emit an alignment directive to the specified power of 691// two boundary. For example, if you pass in 3 here, you will get an 8 692// byte alignment. If a global value is specified, and if that global has 693// an explicit alignment requested, it will unconditionally override the 694// alignment request. However, if ForcedAlignBits is specified, this value 695// has final say: the ultimate alignment will be the max of ForcedAlignBits 696// and the alignment computed with NumBits and the global. 697// 698// The algorithm is: 699// Align = NumBits; 700// if (GV && GV->hasalignment) Align = GV->getalignment(); 701// Align = std::max(Align, ForcedAlignBits); 702// 703void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 704 unsigned ForcedAlignBits, 705 bool UseFillExpr) const { 706 if (GV && GV->getAlignment()) 707 NumBits = Log2_32(GV->getAlignment()); 708 NumBits = std::max(NumBits, ForcedAlignBits); 709 710 if (NumBits == 0) return; // No need to emit alignment. 711 712 unsigned FillValue = 0; 713 if (getCurrentSection()->getKind().isText()) 714 FillValue = MAI->getTextAlignFillValue(); 715 716 OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0); 717} 718 719/// LowerConstant - Lower the specified LLVM Constant to an MCExpr. 720/// 721static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) { 722 MCContext &Ctx = AP.OutContext; 723 724 if (CV->isNullValue() || isa<UndefValue>(CV)) 725 return MCConstantExpr::Create(0, Ctx); 726 727 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) 728 return MCConstantExpr::Create(CI->getZExtValue(), Ctx); 729 730 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) 731 return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx); 732 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) 733 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx); 734 735 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV); 736 if (CE == 0) { 737 llvm_unreachable("Unknown constant value to lower!"); 738 return MCConstantExpr::Create(0, Ctx); 739 } 740 741 switch (CE->getOpcode()) { 742 case Instruction::ZExt: 743 case Instruction::SExt: 744 case Instruction::FPTrunc: 745 case Instruction::FPExt: 746 case Instruction::UIToFP: 747 case Instruction::SIToFP: 748 case Instruction::FPToUI: 749 case Instruction::FPToSI: 750 default: llvm_unreachable("FIXME: Don't support this constant cast expr"); 751 case Instruction::GetElementPtr: { 752 const TargetData &TD = *AP.TM.getTargetData(); 753 // Generate a symbolic expression for the byte address 754 const Constant *PtrVal = CE->getOperand(0); 755 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end()); 756 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0], 757 IdxVec.size()); 758 759 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP); 760 if (Offset == 0) 761 return Base; 762 763 // Truncate/sext the offset to the pointer size. 764 if (TD.getPointerSizeInBits() != 64) { 765 int SExtAmount = 64-TD.getPointerSizeInBits(); 766 Offset = (Offset << SExtAmount) >> SExtAmount; 767 } 768 769 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx), 770 Ctx); 771 } 772 773 case Instruction::Trunc: 774 // We emit the value and depend on the assembler to truncate the generated 775 // expression properly. This is important for differences between 776 // blockaddress labels. Since the two labels are in the same function, it 777 // is reasonable to treat their delta as a 32-bit value. 778 // FALL THROUGH. 779 case Instruction::BitCast: 780 return LowerConstant(CE->getOperand(0), AP); 781 782 case Instruction::IntToPtr: { 783 const TargetData &TD = *AP.TM.getTargetData(); 784 // Handle casts to pointers by changing them into casts to the appropriate 785 // integer type. This promotes constant folding and simplifies this code. 786 Constant *Op = CE->getOperand(0); 787 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()), 788 false/*ZExt*/); 789 return LowerConstant(Op, AP); 790 } 791 792 case Instruction::PtrToInt: { 793 const TargetData &TD = *AP.TM.getTargetData(); 794 // Support only foldable casts to/from pointers that can be eliminated by 795 // changing the pointer to the appropriately sized integer type. 796 Constant *Op = CE->getOperand(0); 797 const Type *Ty = CE->getType(); 798 799 const MCExpr *OpExpr = LowerConstant(Op, AP); 800 801 // We can emit the pointer value into this slot if the slot is an 802 // integer slot equal to the size of the pointer. 803 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType())) 804 return OpExpr; 805 806 // Otherwise the pointer is smaller than the resultant integer, mask off 807 // the high bits so we are sure to get a proper truncation if the input is 808 // a constant expr. 809 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType()); 810 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx); 811 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx); 812 } 813 814 case Instruction::Add: 815 case Instruction::Sub: 816 case Instruction::And: 817 case Instruction::Or: 818 case Instruction::Xor: { 819 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP); 820 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP); 821 switch (CE->getOpcode()) { 822 default: llvm_unreachable("Unknown binary operator constant cast expr"); 823 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx); 824 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx); 825 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx); 826 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx); 827 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx); 828 } 829 } 830 } 831} 832 833static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace, 834 AsmPrinter &AP) { 835 if (AddrSpace != 0 || !CA->isString()) { 836 // Not a string. Print the values in successive locations 837 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 838 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace); 839 return; 840 } 841 842 // Otherwise, it can be emitted as .ascii. 843 SmallVector<char, 128> TmpVec; 844 TmpVec.reserve(CA->getNumOperands()); 845 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 846 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue()); 847 848 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace); 849} 850 851static void EmitGlobalConstantVector(const ConstantVector *CV, 852 unsigned AddrSpace, AsmPrinter &AP) { 853 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i) 854 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace); 855} 856 857static void EmitGlobalConstantStruct(const ConstantStruct *CS, 858 unsigned AddrSpace, AsmPrinter &AP) { 859 // Print the fields in successive locations. Pad to align if needed! 860 const TargetData *TD = AP.TM.getTargetData(); 861 unsigned Size = TD->getTypeAllocSize(CS->getType()); 862 const StructLayout *Layout = TD->getStructLayout(CS->getType()); 863 uint64_t SizeSoFar = 0; 864 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) { 865 const Constant *Field = CS->getOperand(i); 866 867 // Check if padding is needed and insert one or more 0s. 868 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType()); 869 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1)) 870 - Layout->getElementOffset(i)) - FieldSize; 871 SizeSoFar += FieldSize + PadSize; 872 873 // Now print the actual field value. 874 AP.EmitGlobalConstant(Field, AddrSpace); 875 876 // Insert padding - this may include padding to increase the size of the 877 // current field up to the ABI size (if the struct is not packed) as well 878 // as padding to ensure that the next field starts at the right offset. 879 AP.OutStreamer.EmitZeros(PadSize, AddrSpace); 880 } 881 assert(SizeSoFar == Layout->getSizeInBytes() && 882 "Layout of constant struct may be incorrect!"); 883} 884 885static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace, 886 AsmPrinter &AP) { 887 // FP Constants are printed as integer constants to avoid losing 888 // precision. 889 if (CFP->getType()->isDoubleTy()) { 890 if (AP.VerboseAsm) { 891 double Val = CFP->getValueAPF().convertToDouble(); 892 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n'; 893 } 894 895 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 896 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 897 return; 898 } 899 900 if (CFP->getType()->isFloatTy()) { 901 if (AP.VerboseAsm) { 902 float Val = CFP->getValueAPF().convertToFloat(); 903 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n'; 904 } 905 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 906 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace); 907 return; 908 } 909 910 if (CFP->getType()->isX86_FP80Ty()) { 911 // all long double variants are printed as hex 912 // api needed to prevent premature destruction 913 APInt API = CFP->getValueAPF().bitcastToAPInt(); 914 const uint64_t *p = API.getRawData(); 915 if (AP.VerboseAsm) { 916 // Convert to double so we can print the approximate val as a comment. 917 APFloat DoubleVal = CFP->getValueAPF(); 918 bool ignored; 919 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 920 &ignored); 921 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= " 922 << DoubleVal.convertToDouble() << '\n'; 923 } 924 925 if (AP.TM.getTargetData()->isBigEndian()) { 926 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 927 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 928 } else { 929 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 930 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 931 } 932 933 // Emit the tail padding for the long double. 934 const TargetData &TD = *AP.TM.getTargetData(); 935 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) - 936 TD.getTypeStoreSize(CFP->getType()), AddrSpace); 937 return; 938 } 939 940 assert(CFP->getType()->isPPC_FP128Ty() && 941 "Floating point constant type not handled"); 942 // All long double variants are printed as hex api needed to prevent 943 // premature destruction. 944 APInt API = CFP->getValueAPF().bitcastToAPInt(); 945 const uint64_t *p = API.getRawData(); 946 if (AP.TM.getTargetData()->isBigEndian()) { 947 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 948 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 949 } else { 950 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 951 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 952 } 953} 954 955static void EmitGlobalConstantLargeInt(const ConstantInt *CI, 956 unsigned AddrSpace, AsmPrinter &AP) { 957 const TargetData *TD = AP.TM.getTargetData(); 958 unsigned BitWidth = CI->getBitWidth(); 959 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits"); 960 961 // We don't expect assemblers to support integer data directives 962 // for more than 64 bits, so we emit the data in at most 64-bit 963 // quantities at a time. 964 const uint64_t *RawData = CI->getValue().getRawData(); 965 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 966 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i]; 967 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 968 } 969} 970 971/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 972void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { 973 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) { 974 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 975 return OutStreamer.EmitZeros(Size, AddrSpace); 976 } 977 978 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 979 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 980 switch (Size) { 981 case 1: 982 case 2: 983 case 4: 984 case 8: 985 if (VerboseAsm) 986 OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue()); 987 OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace); 988 return; 989 default: 990 EmitGlobalConstantLargeInt(CI, AddrSpace, *this); 991 return; 992 } 993 } 994 995 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) 996 return EmitGlobalConstantArray(CVA, AddrSpace, *this); 997 998 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) 999 return EmitGlobalConstantStruct(CVS, AddrSpace, *this); 1000 1001 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) 1002 return EmitGlobalConstantFP(CFP, AddrSpace, *this); 1003 1004 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV)) 1005 return EmitGlobalConstantVector(V, AddrSpace, *this); 1006 1007 if (isa<ConstantPointerNull>(CV)) { 1008 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1009 OutStreamer.EmitIntValue(0, Size, AddrSpace); 1010 return; 1011 } 1012 1013 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it 1014 // thread the streamer with EmitValue. 1015 OutStreamer.EmitValue(LowerConstant(CV, *this), 1016 TM.getTargetData()->getTypeAllocSize(CV->getType()), 1017 AddrSpace); 1018} 1019 1020void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1021 // Target doesn't support this yet! 1022 llvm_unreachable("Target does not support EmitMachineConstantPoolValue"); 1023} 1024 1025/// PrintSpecial - Print information related to the specified machine instr 1026/// that is independent of the operand, and may be independent of the instr 1027/// itself. This can be useful for portably encoding the comment character 1028/// or other bits of target-specific knowledge into the asmstrings. The 1029/// syntax used is ${:comment}. Targets can override this to add support 1030/// for their own strange codes. 1031void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const { 1032 if (!strcmp(Code, "private")) { 1033 O << MAI->getPrivateGlobalPrefix(); 1034 } else if (!strcmp(Code, "comment")) { 1035 if (VerboseAsm) 1036 O << MAI->getCommentString(); 1037 } else if (!strcmp(Code, "uid")) { 1038 // Comparing the address of MI isn't sufficient, because machineinstrs may 1039 // be allocated to the same address across functions. 1040 const Function *ThisF = MI->getParent()->getParent()->getFunction(); 1041 1042 // If this is a new LastFn instruction, bump the counter. 1043 if (LastMI != MI || LastFn != ThisF) { 1044 ++Counter; 1045 LastMI = MI; 1046 LastFn = ThisF; 1047 } 1048 O << Counter; 1049 } else { 1050 std::string msg; 1051 raw_string_ostream Msg(msg); 1052 Msg << "Unknown special formatter '" << Code 1053 << "' for machine instr: " << *MI; 1054 llvm_report_error(Msg.str()); 1055 } 1056} 1057 1058/// processDebugLoc - Processes the debug information of each machine 1059/// instruction's DebugLoc. 1060void AsmPrinter::processDebugLoc(const MachineInstr *MI, 1061 bool BeforePrintingInsn) { 1062 if (!MAI || !DW || !MAI->doesSupportDebugInformation() 1063 || !DW->ShouldEmitDwarfDebug()) 1064 return; 1065 DebugLoc DL = MI->getDebugLoc(); 1066 if (DL.isUnknown()) 1067 return; 1068 DILocation CurDLT = MF->getDILocation(DL); 1069 if (CurDLT.getScope().isNull()) 1070 return; 1071 1072 if (!BeforePrintingInsn) { 1073 // After printing instruction 1074 DW->EndScope(MI); 1075 } else if (CurDLT.getNode() != PrevDLT) { 1076 unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(), 1077 CurDLT.getColumnNumber(), 1078 CurDLT.getScope().getNode()); 1079 printLabel(L); 1080 O << '\n'; 1081 DW->BeginScope(MI, L); 1082 PrevDLT = CurDLT.getNode(); 1083 } 1084} 1085 1086 1087/// printInlineAsm - This method formats and prints the specified machine 1088/// instruction that is an inline asm. 1089void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { 1090 unsigned NumOperands = MI->getNumOperands(); 1091 1092 // Count the number of register definitions. 1093 unsigned NumDefs = 0; 1094 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef(); 1095 ++NumDefs) 1096 assert(NumDefs != NumOperands-1 && "No asm string?"); 1097 1098 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?"); 1099 1100 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. 1101 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); 1102 1103 O << '\t'; 1104 1105 // If this asmstr is empty, just print the #APP/#NOAPP markers. 1106 // These are useful to see where empty asm's wound up. 1107 if (AsmStr[0] == 0) { 1108 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1109 O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n'; 1110 return; 1111 } 1112 1113 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1114 1115 // The variant of the current asmprinter. 1116 int AsmPrinterVariant = MAI->getAssemblerDialect(); 1117 1118 int CurVariant = -1; // The number of the {.|.|.} region we are in. 1119 const char *LastEmitted = AsmStr; // One past the last character emitted. 1120 1121 while (*LastEmitted) { 1122 switch (*LastEmitted) { 1123 default: { 1124 // Not a special case, emit the string section literally. 1125 const char *LiteralEnd = LastEmitted+1; 1126 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && 1127 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') 1128 ++LiteralEnd; 1129 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1130 O.write(LastEmitted, LiteralEnd-LastEmitted); 1131 LastEmitted = LiteralEnd; 1132 break; 1133 } 1134 case '\n': 1135 ++LastEmitted; // Consume newline character. 1136 O << '\n'; // Indent code with newline. 1137 break; 1138 case '$': { 1139 ++LastEmitted; // Consume '$' character. 1140 bool Done = true; 1141 1142 // Handle escapes. 1143 switch (*LastEmitted) { 1144 default: Done = false; break; 1145 case '$': // $$ -> $ 1146 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1147 O << '$'; 1148 ++LastEmitted; // Consume second '$' character. 1149 break; 1150 case '(': // $( -> same as GCC's { character. 1151 ++LastEmitted; // Consume '(' character. 1152 if (CurVariant != -1) { 1153 llvm_report_error("Nested variants found in inline asm string: '" 1154 + std::string(AsmStr) + "'"); 1155 } 1156 CurVariant = 0; // We're in the first variant now. 1157 break; 1158 case '|': 1159 ++LastEmitted; // consume '|' character. 1160 if (CurVariant == -1) 1161 O << '|'; // this is gcc's behavior for | outside a variant 1162 else 1163 ++CurVariant; // We're in the next variant. 1164 break; 1165 case ')': // $) -> same as GCC's } char. 1166 ++LastEmitted; // consume ')' character. 1167 if (CurVariant == -1) 1168 O << '}'; // this is gcc's behavior for } outside a variant 1169 else 1170 CurVariant = -1; 1171 break; 1172 } 1173 if (Done) break; 1174 1175 bool HasCurlyBraces = false; 1176 if (*LastEmitted == '{') { // ${variable} 1177 ++LastEmitted; // Consume '{' character. 1178 HasCurlyBraces = true; 1179 } 1180 1181 // If we have ${:foo}, then this is not a real operand reference, it is a 1182 // "magic" string reference, just like in .td files. Arrange to call 1183 // PrintSpecial. 1184 if (HasCurlyBraces && *LastEmitted == ':') { 1185 ++LastEmitted; 1186 const char *StrStart = LastEmitted; 1187 const char *StrEnd = strchr(StrStart, '}'); 1188 if (StrEnd == 0) { 1189 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '" 1190 + std::string(AsmStr) + "'"); 1191 } 1192 1193 std::string Val(StrStart, StrEnd); 1194 PrintSpecial(MI, Val.c_str()); 1195 LastEmitted = StrEnd+1; 1196 break; 1197 } 1198 1199 const char *IDStart = LastEmitted; 1200 char *IDEnd; 1201 errno = 0; 1202 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. 1203 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { 1204 llvm_report_error("Bad $ operand number in inline asm string: '" 1205 + std::string(AsmStr) + "'"); 1206 } 1207 LastEmitted = IDEnd; 1208 1209 char Modifier[2] = { 0, 0 }; 1210 1211 if (HasCurlyBraces) { 1212 // If we have curly braces, check for a modifier character. This 1213 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. 1214 if (*LastEmitted == ':') { 1215 ++LastEmitted; // Consume ':' character. 1216 if (*LastEmitted == 0) { 1217 llvm_report_error("Bad ${:} expression in inline asm string: '" 1218 + std::string(AsmStr) + "'"); 1219 } 1220 1221 Modifier[0] = *LastEmitted; 1222 ++LastEmitted; // Consume modifier character. 1223 } 1224 1225 if (*LastEmitted != '}') { 1226 llvm_report_error("Bad ${} expression in inline asm string: '" 1227 + std::string(AsmStr) + "'"); 1228 } 1229 ++LastEmitted; // Consume '}' character. 1230 } 1231 1232 if ((unsigned)Val >= NumOperands-1) { 1233 llvm_report_error("Invalid $ operand number in inline asm string: '" 1234 + std::string(AsmStr) + "'"); 1235 } 1236 1237 // Okay, we finally have a value number. Ask the target to print this 1238 // operand! 1239 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { 1240 unsigned OpNo = 1; 1241 1242 bool Error = false; 1243 1244 // Scan to find the machine operand number for the operand. 1245 for (; Val; --Val) { 1246 if (OpNo >= MI->getNumOperands()) break; 1247 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1248 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1; 1249 } 1250 1251 if (OpNo >= MI->getNumOperands()) { 1252 Error = true; 1253 } else { 1254 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1255 ++OpNo; // Skip over the ID number. 1256 1257 if (Modifier[0] == 'l') // labels are target independent 1258 O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber()); 1259 else { 1260 AsmPrinter *AP = const_cast<AsmPrinter*>(this); 1261 if ((OpFlags & 7) == 4) { 1262 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, 1263 Modifier[0] ? Modifier : 0); 1264 } else { 1265 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, 1266 Modifier[0] ? Modifier : 0); 1267 } 1268 } 1269 } 1270 if (Error) { 1271 std::string msg; 1272 raw_string_ostream Msg(msg); 1273 Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n"; 1274 MI->print(Msg); 1275 llvm_report_error(Msg.str()); 1276 } 1277 } 1278 break; 1279 } 1280 } 1281 } 1282 O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd(); 1283} 1284 1285/// printImplicitDef - This method prints the specified machine instruction 1286/// that is an implicit def. 1287void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { 1288 if (!VerboseAsm) return; 1289 O.PadToColumn(MAI->getCommentColumn()); 1290 O << MAI->getCommentString() << " implicit-def: " 1291 << TRI->getName(MI->getOperand(0).getReg()); 1292} 1293 1294void AsmPrinter::printKill(const MachineInstr *MI) const { 1295 if (!VerboseAsm) return; 1296 O.PadToColumn(MAI->getCommentColumn()); 1297 O << MAI->getCommentString() << " kill:"; 1298 for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) { 1299 const MachineOperand &op = MI->getOperand(n); 1300 assert(op.isReg() && "KILL instruction must have only register operands"); 1301 O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>"); 1302 } 1303} 1304 1305/// printLabel - This method prints a local label used by debug and 1306/// exception handling tables. 1307void AsmPrinter::printLabel(const MachineInstr *MI) const { 1308 printLabel(MI->getOperand(0).getImm()); 1309} 1310 1311void AsmPrinter::printLabel(unsigned Id) const { 1312 O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':'; 1313} 1314 1315/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 1316/// instruction, using the specified assembler variant. Targets should 1317/// override this to format as appropriate. 1318bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 1319 unsigned AsmVariant, const char *ExtraCode) { 1320 // Target doesn't support this yet! 1321 return true; 1322} 1323 1324bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 1325 unsigned AsmVariant, 1326 const char *ExtraCode) { 1327 // Target doesn't support this yet! 1328 return true; 1329} 1330 1331MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA, 1332 const char *Suffix) const { 1333 return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix); 1334} 1335 1336MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F, 1337 const BasicBlock *BB, 1338 const char *Suffix) const { 1339 assert(BB->hasName() && 1340 "Address of anonymous basic block not supported yet!"); 1341 1342 // This code must use the function name itself, and not the function number, 1343 // since it must be possible to generate the label name from within other 1344 // functions. 1345 SmallString<60> FnName; 1346 Mang->getNameWithPrefix(FnName, F, false); 1347 1348 // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME! 1349 SmallString<60> NameResult; 1350 Mang->getNameWithPrefix(NameResult, 1351 StringRef("BA") + Twine((unsigned)FnName.size()) + 1352 "_" + FnName.str() + "_" + BB->getName() + Suffix, 1353 Mangler::Private); 1354 1355 return OutContext.GetOrCreateSymbol(NameResult.str()); 1356} 1357 1358MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const { 1359 SmallString<60> Name; 1360 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB" 1361 << getFunctionNumber() << '_' << MBBID; 1362 return OutContext.GetOrCreateSymbol(Name.str()); 1363} 1364 1365/// GetCPISymbol - Return the symbol for the specified constant pool entry. 1366MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const { 1367 SmallString<60> Name; 1368 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI" 1369 << getFunctionNumber() << '_' << CPID; 1370 return OutContext.GetOrCreateSymbol(Name.str()); 1371} 1372 1373/// GetJTISymbol - Return the symbol for the specified jump table entry. 1374MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const { 1375 const char *Prefix = isLinkerPrivate ? MAI->getLinkerPrivateGlobalPrefix() : 1376 MAI->getPrivateGlobalPrefix(); 1377 SmallString<60> Name; 1378 raw_svector_ostream(Name) << Prefix << "JTI" << getFunctionNumber() << '_' 1379 << JTID; 1380 return OutContext.GetOrCreateSymbol(Name.str()); 1381} 1382 1383/// GetJTSetSymbol - Return the symbol for the specified jump table .set 1384/// FIXME: privatize to AsmPrinter. 1385MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const { 1386 SmallString<60> Name; 1387 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() 1388 << getFunctionNumber() << '_' << UID << "_set_" << MBBID; 1389 return OutContext.GetOrCreateSymbol(Name.str()); 1390} 1391 1392/// GetGlobalValueSymbol - Return the MCSymbol for the specified global 1393/// value. 1394MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const { 1395 SmallString<60> NameStr; 1396 Mang->getNameWithPrefix(NameStr, GV, false); 1397 return OutContext.GetOrCreateSymbol(NameStr.str()); 1398} 1399 1400/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with 1401/// global value name as its base, with the specified suffix, and where the 1402/// symbol is forced to have private linkage if ForcePrivate is true. 1403MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV, 1404 StringRef Suffix, 1405 bool ForcePrivate) const { 1406 SmallString<60> NameStr; 1407 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate); 1408 NameStr.append(Suffix.begin(), Suffix.end()); 1409 return OutContext.GetOrCreateSymbol(NameStr.str()); 1410} 1411 1412/// GetExternalSymbolSymbol - Return the MCSymbol for the specified 1413/// ExternalSymbol. 1414MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const { 1415 SmallString<60> NameStr; 1416 Mang->getNameWithPrefix(NameStr, Sym); 1417 return OutContext.GetOrCreateSymbol(NameStr.str()); 1418} 1419 1420 1421 1422/// PrintParentLoopComment - Print comments about parent loops of this one. 1423static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1424 unsigned FunctionNumber) { 1425 if (Loop == 0) return; 1426 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber); 1427 OS.indent(Loop->getLoopDepth()*2) 1428 << "Parent Loop BB" << FunctionNumber << "_" 1429 << Loop->getHeader()->getNumber() 1430 << " Depth=" << Loop->getLoopDepth() << '\n'; 1431} 1432 1433 1434/// PrintChildLoopComment - Print comments about child loops within 1435/// the loop for this basic block, with nesting. 1436static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1437 unsigned FunctionNumber) { 1438 // Add child loop information 1439 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){ 1440 OS.indent((*CL)->getLoopDepth()*2) 1441 << "Child Loop BB" << FunctionNumber << "_" 1442 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth() 1443 << '\n'; 1444 PrintChildLoopComment(OS, *CL, FunctionNumber); 1445 } 1446} 1447 1448/// EmitComments - Pretty-print comments for basic blocks. 1449static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB, 1450 const MachineLoopInfo *LI, 1451 const AsmPrinter &AP) { 1452 // Add loop depth information 1453 const MachineLoop *Loop = LI->getLoopFor(&MBB); 1454 if (Loop == 0) return; 1455 1456 MachineBasicBlock *Header = Loop->getHeader(); 1457 assert(Header && "No header for loop"); 1458 1459 // If this block is not a loop header, just print out what is the loop header 1460 // and return. 1461 if (Header != &MBB) { 1462 AP.OutStreamer.AddComment(" in Loop: Header=BB" + 1463 Twine(AP.getFunctionNumber())+"_" + 1464 Twine(Loop->getHeader()->getNumber())+ 1465 " Depth="+Twine(Loop->getLoopDepth())); 1466 return; 1467 } 1468 1469 // Otherwise, it is a loop header. Print out information about child and 1470 // parent loops. 1471 raw_ostream &OS = AP.OutStreamer.GetCommentOS(); 1472 1473 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber()); 1474 1475 OS << "=>"; 1476 OS.indent(Loop->getLoopDepth()*2-2); 1477 1478 OS << "This "; 1479 if (Loop->empty()) 1480 OS << "Inner "; 1481 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n'; 1482 1483 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber()); 1484} 1485 1486 1487/// EmitBasicBlockStart - This method prints the label for the specified 1488/// MachineBasicBlock, an alignment (if present) and a comment describing 1489/// it if appropriate. 1490void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { 1491 // Emit an alignment directive for this block, if needed. 1492 if (unsigned Align = MBB->getAlignment()) 1493 EmitAlignment(Log2_32(Align)); 1494 1495 // If the block has its address taken, emit a special label to satisfy 1496 // references to the block. This is done so that we don't need to 1497 // remember the number of this label, and so that we can make 1498 // forward references to labels without knowing what their numbers 1499 // will be. 1500 if (MBB->hasAddressTaken()) { 1501 const BasicBlock *BB = MBB->getBasicBlock(); 1502 if (VerboseAsm) 1503 OutStreamer.AddComment("Address Taken"); 1504 OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB)); 1505 } 1506 1507 // Print the main label for the block. 1508 if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) { 1509 if (VerboseAsm) { 1510 // NOTE: Want this comment at start of line. 1511 O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':'; 1512 if (const BasicBlock *BB = MBB->getBasicBlock()) 1513 if (BB->hasName()) 1514 OutStreamer.AddComment("%" + BB->getName()); 1515 1516 PrintBasicBlockLoopComments(*MBB, LI, *this); 1517 OutStreamer.AddBlankLine(); 1518 } 1519 } else { 1520 if (VerboseAsm) { 1521 if (const BasicBlock *BB = MBB->getBasicBlock()) 1522 if (BB->hasName()) 1523 OutStreamer.AddComment("%" + BB->getName()); 1524 PrintBasicBlockLoopComments(*MBB, LI, *this); 1525 } 1526 1527 OutStreamer.EmitLabel(GetMBBSymbol(MBB->getNumber())); 1528 } 1529} 1530 1531/// printPICJumpTableSetLabel - This method prints a set label for the 1532/// specified MachineBasicBlock for a jumptable entry. 1533void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, 1534 const MachineBasicBlock *MBB) const { 1535 if (!MAI->getSetDirective()) 1536 return; 1537 1538 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix() 1539 << *GetJTSetSymbol(uid, MBB->getNumber()) << ',' 1540 << *GetMBBSymbol(MBB->getNumber()) << '-' << *GetJTISymbol(uid) << '\n'; 1541} 1542 1543void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const { 1544 MCSymbolAttr Attr = MCSA_Invalid; 1545 1546 switch (Visibility) { 1547 default: break; 1548 case GlobalValue::HiddenVisibility: 1549 Attr = MAI->getHiddenVisibilityAttr(); 1550 break; 1551 case GlobalValue::ProtectedVisibility: 1552 Attr = MAI->getProtectedVisibilityAttr(); 1553 break; 1554 } 1555 1556 if (Attr != MCSA_Invalid) 1557 OutStreamer.EmitSymbolAttribute(Sym, Attr); 1558} 1559 1560void AsmPrinter::printOffset(int64_t Offset) const { 1561 if (Offset > 0) 1562 O << '+' << Offset; 1563 else if (Offset < 0) 1564 O << Offset; 1565} 1566 1567GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1568 if (!S->usesMetadata()) 1569 return 0; 1570 1571 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1572 if (GCPI != GCMetadataPrinters.end()) 1573 return GCPI->second; 1574 1575 const char *Name = S->getName().c_str(); 1576 1577 for (GCMetadataPrinterRegistry::iterator 1578 I = GCMetadataPrinterRegistry::begin(), 1579 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1580 if (strcmp(Name, I->getName()) == 0) { 1581 GCMetadataPrinter *GMP = I->instantiate(); 1582 GMP->S = S; 1583 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1584 return GMP; 1585 } 1586 1587 llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name)); 1588 return 0; 1589} 1590 1591/// EmitComments - Pretty-print comments for instructions 1592void AsmPrinter::EmitComments(const MachineInstr &MI) const { 1593 if (!VerboseAsm) 1594 return; 1595 1596 bool Newline = false; 1597 1598 if (!MI.getDebugLoc().isUnknown()) { 1599 DILocation DLT = MF->getDILocation(MI.getDebugLoc()); 1600 1601 // Print source line info. 1602 O.PadToColumn(MAI->getCommentColumn()); 1603 O << MAI->getCommentString() << ' '; 1604 DIScope Scope = DLT.getScope(); 1605 // Omit the directory, because it's likely to be long and uninteresting. 1606 if (!Scope.isNull()) 1607 O << Scope.getFilename(); 1608 else 1609 O << "<unknown>"; 1610 O << ':' << DLT.getLineNumber(); 1611 if (DLT.getColumnNumber() != 0) 1612 O << ':' << DLT.getColumnNumber(); 1613 Newline = true; 1614 } 1615 1616 // Check for spills and reloads 1617 int FI; 1618 1619 const MachineFrameInfo *FrameInfo = 1620 MI.getParent()->getParent()->getFrameInfo(); 1621 1622 // We assume a single instruction only has a spill or reload, not 1623 // both. 1624 const MachineMemOperand *MMO; 1625 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) { 1626 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1627 MMO = *MI.memoperands_begin(); 1628 if (Newline) O << '\n'; 1629 O.PadToColumn(MAI->getCommentColumn()); 1630 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload"; 1631 Newline = true; 1632 } 1633 } 1634 else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) { 1635 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1636 if (Newline) O << '\n'; 1637 O.PadToColumn(MAI->getCommentColumn()); 1638 O << MAI->getCommentString() << ' ' 1639 << MMO->getSize() << "-byte Folded Reload"; 1640 Newline = true; 1641 } 1642 } 1643 else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) { 1644 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1645 MMO = *MI.memoperands_begin(); 1646 if (Newline) O << '\n'; 1647 O.PadToColumn(MAI->getCommentColumn()); 1648 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill"; 1649 Newline = true; 1650 } 1651 } 1652 else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) { 1653 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1654 if (Newline) O << '\n'; 1655 O.PadToColumn(MAI->getCommentColumn()); 1656 O << MAI->getCommentString() << ' ' 1657 << MMO->getSize() << "-byte Folded Spill"; 1658 Newline = true; 1659 } 1660 } 1661 1662 // Check for spill-induced copies 1663 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx; 1664 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg, 1665 SrcSubIdx, DstSubIdx)) { 1666 if (MI.getAsmPrinterFlag(ReloadReuse)) { 1667 if (Newline) O << '\n'; 1668 O.PadToColumn(MAI->getCommentColumn()); 1669 O << MAI->getCommentString() << " Reload Reuse"; 1670 } 1671 } 1672} 1673 1674