AsmPrinter.cpp revision 05f845314a67f9c30a67e55ce1e3168ff6732ce8
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/MCInst.h" 30#include "llvm/MC/MCSection.h" 31#include "llvm/MC/MCStreamer.h" 32#include "llvm/MC/MCSymbol.h" 33#include "llvm/Support/CommandLine.h" 34#include "llvm/Support/ErrorHandling.h" 35#include "llvm/Support/Format.h" 36#include "llvm/Support/FormattedStream.h" 37#include "llvm/MC/MCAsmInfo.h" 38#include "llvm/Target/Mangler.h" 39#include "llvm/Target/TargetData.h" 40#include "llvm/Target/TargetInstrInfo.h" 41#include "llvm/Target/TargetLowering.h" 42#include "llvm/Target/TargetLoweringObjectFile.h" 43#include "llvm/Target/TargetOptions.h" 44#include "llvm/Target/TargetRegisterInfo.h" 45#include "llvm/ADT/SmallPtrSet.h" 46#include "llvm/ADT/SmallString.h" 47#include <cerrno> 48using namespace llvm; 49 50static cl::opt<cl::boolOrDefault> 51AsmVerbose("asm-verbose", cl::desc("Add comments to directives."), 52 cl::init(cl::BOU_UNSET)); 53 54static bool getVerboseAsm(bool VDef) { 55 switch (AsmVerbose) { 56 default: 57 case cl::BOU_UNSET: return VDef; 58 case cl::BOU_TRUE: return true; 59 case cl::BOU_FALSE: return false; 60 } 61} 62 63char AsmPrinter::ID = 0; 64AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm, 65 const MCAsmInfo *T, bool VDef) 66 : MachineFunctionPass(&ID), FunctionNumber(0), O(o), 67 TM(tm), MAI(T), TRI(tm.getRegisterInfo()), 68 69 OutContext(*new MCContext()), 70 // FIXME: Pass instprinter to streamer. 71 OutStreamer(*createAsmStreamer(OutContext, O, *T, 72 TM.getTargetData()->isLittleEndian(), 73 getVerboseAsm(VDef), 0)), 74 75 LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) { 76 DW = 0; MMI = 0; 77 VerboseAsm = getVerboseAsm(VDef); 78} 79 80AsmPrinter::~AsmPrinter() { 81 for (gcp_iterator I = GCMetadataPrinters.begin(), 82 E = GCMetadataPrinters.end(); I != E; ++I) 83 delete I->second; 84 85 delete &OutStreamer; 86 delete &OutContext; 87} 88 89TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const { 90 return TM.getTargetLowering()->getObjFileLowering(); 91} 92 93/// getCurrentSection() - Return the current section we are emitting to. 94const MCSection *AsmPrinter::getCurrentSection() const { 95 return OutStreamer.getCurrentSection(); 96} 97 98 99void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { 100 AU.setPreservesAll(); 101 MachineFunctionPass::getAnalysisUsage(AU); 102 AU.addRequired<GCModuleInfo>(); 103 if (VerboseAsm) 104 AU.addRequired<MachineLoopInfo>(); 105} 106 107bool AsmPrinter::doInitialization(Module &M) { 108 // Initialize TargetLoweringObjectFile. 109 const_cast<TargetLoweringObjectFile&>(getObjFileLowering()) 110 .Initialize(OutContext, TM); 111 112 Mang = new Mangler(*MAI); 113 114 // Allow the target to emit any magic that it wants at the start of the file. 115 EmitStartOfAsmFile(M); 116 117 if (MAI->hasSingleParameterDotFile()) { 118 /* Very minimal debug info. It is ignored if we emit actual 119 debug info. If we don't, this at least helps the user find where 120 a function came from. */ 121 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n"; 122 } 123 124 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 125 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 126 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 127 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 128 MP->beginAssembly(O, *this, *MAI); 129 130 if (!M.getModuleInlineAsm().empty()) 131 O << MAI->getCommentString() << " Start of file scope inline assembly\n" 132 << M.getModuleInlineAsm() 133 << '\n' << MAI->getCommentString() 134 << " End of file scope inline assembly\n"; 135 136 MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 137 if (MMI) 138 MMI->AnalyzeModule(M); 139 DW = getAnalysisIfAvailable<DwarfWriter>(); 140 if (DW) 141 DW->BeginModule(&M, MMI, O, this, MAI); 142 143 return false; 144} 145 146/// EmitGlobalVariable - Emit the specified global variable to the .s file. 147void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { 148 if (!GV->hasInitializer()) // External globals require no code. 149 return; 150 151 // Check to see if this is a special global used by LLVM, if so, emit it. 152 if (EmitSpecialLLVMGlobal(GV)) 153 return; 154 155 MCSymbol *GVSym = GetGlobalValueSymbol(GV); 156 printVisibility(GVSym, GV->getVisibility()); 157 158 if (MAI->hasDotTypeDotSizeDirective()) { 159 O << "\t.type\t" << *GVSym; 160 if (MAI->getCommentString()[0] != '@') 161 O << ",@object\n"; 162 else 163 O << ",%object\n"; 164 } 165 166 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM); 167 168 const TargetData *TD = TM.getTargetData(); 169 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType()); 170 unsigned AlignLog = TD->getPreferredAlignmentLog(GV); 171 172 // Handle common and BSS local symbols (.lcomm). 173 if (GVKind.isCommon() || GVKind.isBSSLocal()) { 174 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 175 176 if (VerboseAsm) { 177 WriteAsOperand(OutStreamer.GetCommentOS(), GV, 178 /*PrintType=*/false, GV->getParent()); 179 OutStreamer.GetCommentOS() << '\n'; 180 } 181 182 // Handle common symbols. 183 if (GVKind.isCommon()) { 184 // .comm _foo, 42, 4 185 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 186 return; 187 } 188 189 // Handle local BSS symbols. 190 if (MAI->hasMachoZeroFillDirective()) { 191 const MCSection *TheSection = 192 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 193 // .zerofill __DATA, __bss, _foo, 400, 5 194 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 195 return; 196 } 197 198 if (const char *LComm = MAI->getLCOMMDirective()) { 199 // .lcomm _foo, 42 200 O << LComm << *GVSym << ',' << Size; 201 O << '\n'; 202 return; 203 } 204 205 // .local _foo 206 O << "\t.local\t" << *GVSym << '\n'; 207 // .comm _foo, 42, 4 208 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 209 return; 210 } 211 212 const MCSection *TheSection = 213 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 214 215 // Handle the zerofill directive on darwin, which is a special form of BSS 216 // emission. 217 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) { 218 // .globl _foo 219 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global); 220 // .zerofill __DATA, __common, _foo, 400, 5 221 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 222 return; 223 } 224 225 OutStreamer.SwitchSection(TheSection); 226 227 // TODO: Factor into an 'emit linkage' thing that is shared with function 228 // bodies. 229 switch (GV->getLinkage()) { 230 case GlobalValue::CommonLinkage: 231 case GlobalValue::LinkOnceAnyLinkage: 232 case GlobalValue::LinkOnceODRLinkage: 233 case GlobalValue::WeakAnyLinkage: 234 case GlobalValue::WeakODRLinkage: 235 case GlobalValue::LinkerPrivateLinkage: 236 if (MAI->getWeakDefDirective() != 0) { 237 // .globl _foo 238 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global); 239 // .weak_definition _foo 240 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::WeakDefinition); 241 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) { 242 // .globl _foo 243 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global); 244 // .linkonce same_size 245 O << LinkOnce; 246 } else { 247 // .weak _foo 248 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Weak); 249 } 250 break; 251 case GlobalValue::DLLExportLinkage: 252 case GlobalValue::AppendingLinkage: 253 // FIXME: appending linkage variables should go into a section of 254 // their name or something. For now, just emit them as external. 255 case GlobalValue::ExternalLinkage: 256 // If external or appending, declare as a global symbol. 257 // .globl _foo 258 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global); 259 break; 260 case GlobalValue::PrivateLinkage: 261 case GlobalValue::InternalLinkage: 262 break; 263 default: 264 llvm_unreachable("Unknown linkage type!"); 265 } 266 267 EmitAlignment(AlignLog, GV); 268 if (VerboseAsm) { 269 WriteAsOperand(OutStreamer.GetCommentOS(), GV, 270 /*PrintType=*/false, GV->getParent()); 271 OutStreamer.GetCommentOS() << '\n'; 272 } 273 OutStreamer.EmitLabel(GVSym); 274 275 EmitGlobalConstant(GV->getInitializer()); 276 277 if (MAI->hasDotTypeDotSizeDirective()) 278 O << "\t.size\t" << *GVSym << ", " << Size << '\n'; 279 280 OutStreamer.AddBlankLine(); 281} 282 283 284bool AsmPrinter::doFinalization(Module &M) { 285 // Emit global variables. 286 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 287 I != E; ++I) 288 EmitGlobalVariable(I); 289 290 // Emit final debug information. 291 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling()) 292 DW->EndModule(); 293 294 // If the target wants to know about weak references, print them all. 295 if (MAI->getWeakRefDirective()) { 296 // FIXME: This is not lazy, it would be nice to only print weak references 297 // to stuff that is actually used. Note that doing so would require targets 298 // to notice uses in operands (due to constant exprs etc). This should 299 // happen with the MC stuff eventually. 300 301 // Print out module-level global variables here. 302 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 303 I != E; ++I) { 304 if (!I->hasExternalWeakLinkage()) continue; 305 O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n'; 306 } 307 308 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) { 309 if (!I->hasExternalWeakLinkage()) continue; 310 O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n'; 311 } 312 } 313 314 if (MAI->getSetDirective()) { 315 O << '\n'; 316 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 317 I != E; ++I) { 318 MCSymbol *Name = GetGlobalValueSymbol(I); 319 320 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 321 MCSymbol *Target = GetGlobalValueSymbol(GV); 322 323 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective()) 324 O << "\t.globl\t" << *Name << '\n'; 325 else if (I->hasWeakLinkage()) 326 O << MAI->getWeakRefDirective() << *Name << '\n'; 327 else 328 assert(I->hasLocalLinkage() && "Invalid alias linkage"); 329 330 printVisibility(Name, I->getVisibility()); 331 332 O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n'; 333 } 334 } 335 336 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 337 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 338 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 339 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 340 MP->finishAssembly(O, *this, *MAI); 341 342 // If we don't have any trampolines, then we don't require stack memory 343 // to be executable. Some targets have a directive to declare this. 344 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 345 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 346 if (MAI->getNonexecutableStackDirective()) 347 O << MAI->getNonexecutableStackDirective() << '\n'; 348 349 350 // 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 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' 453 << CPI << ':'; 454 if (VerboseAsm) { 455 O.PadToColumn(MAI->getCommentColumn()); 456 O << MAI->getCommentString() << " constant "; 457 WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent()); 458 } 459 O << '\n'; 460 if (CPE.isMachineConstantPoolEntry()) 461 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); 462 else 463 EmitGlobalConstant(CPE.Val.ConstVal); 464 } 465 } 466} 467 468/// EmitJumpTableInfo - Print assembly representations of the jump tables used 469/// by the current function to the current output stream. 470/// 471void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI, 472 MachineFunction &MF) { 473 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 474 if (JT.empty()) return; 475 476 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 477 478 // Pick the directive to use to print the jump table entries, and switch to 479 // the appropriate section. 480 TargetLowering *LoweringInfo = TM.getTargetLowering(); 481 482 const Function *F = MF.getFunction(); 483 bool JTInDiffSection = false; 484 if (F->isWeakForLinker() || 485 (IsPic && !LoweringInfo->usesGlobalOffsetTable())) { 486 // In PIC mode, we need to emit the jump table to the same section as the 487 // function body itself, otherwise the label differences won't make sense. 488 // We should also do if the section name is NULL or function is declared in 489 // discardable section. 490 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, 491 TM)); 492 } else { 493 // Otherwise, drop it in the readonly section. 494 const MCSection *ReadOnlySection = 495 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly()); 496 OutStreamer.SwitchSection(ReadOnlySection); 497 JTInDiffSection = true; 498 } 499 500 EmitAlignment(Log2_32(MJTI->getAlignment())); 501 502 for (unsigned i = 0, e = JT.size(); i != e; ++i) { 503 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; 504 505 // If this jump table was deleted, ignore it. 506 if (JTBBs.empty()) continue; 507 508 // For PIC codegen, if possible we want to use the SetDirective to reduce 509 // the number of relocations the assembler will generate for the jump table. 510 // Set directives are all printed before the jump table itself. 511 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; 512 if (MAI->getSetDirective() && IsPic) 513 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 514 if (EmittedSets.insert(JTBBs[ii])) 515 printPICJumpTableSetLabel(i, JTBBs[ii]); 516 517 // On some targets (e.g. Darwin) we want to emit two consequtive labels 518 // before each jump table. The first label is never referenced, but tells 519 // the assembler and linker the extents of the jump table object. The 520 // second label is actually referenced by the code. 521 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) { 522 O << MAI->getLinkerPrivateGlobalPrefix() 523 << "JTI" << getFunctionNumber() << '_' << i << ":\n"; 524 } 525 526 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 527 << '_' << i << ":\n"; 528 529 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 530 printPICJumpTableEntry(MJTI, JTBBs[ii], i); 531 O << '\n'; 532 } 533 } 534} 535 536void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, 537 const MachineBasicBlock *MBB, 538 unsigned uid) const { 539 bool isPIC = TM.getRelocationModel() == Reloc::PIC_; 540 541 // Use JumpTableDirective otherwise honor the entry size from the jump table 542 // info. 543 const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC); 544 bool HadJTEntryDirective = JTEntryDirective != NULL; 545 if (!HadJTEntryDirective) { 546 JTEntryDirective = MJTI->getEntrySize() == 4 ? 547 MAI->getData32bitsDirective() : MAI->getData64bitsDirective(); 548 } 549 550 O << JTEntryDirective << ' '; 551 552 // If we have emitted set directives for the jump table entries, print 553 // them rather than the entries themselves. If we're emitting PIC, then 554 // emit the table entries as differences between two text section labels. 555 // If we're emitting non-PIC code, then emit the entries as direct 556 // references to the target basic blocks. 557 if (!isPIC) { 558 O << *GetMBBSymbol(MBB->getNumber()); 559 } else if (MAI->getSetDirective()) { 560 O << MAI->getPrivateGlobalPrefix() << getFunctionNumber() 561 << '_' << uid << "_set_" << MBB->getNumber(); 562 } else { 563 O << *GetMBBSymbol(MBB->getNumber()); 564 // If the arch uses custom Jump Table directives, don't calc relative to 565 // JT 566 if (!HadJTEntryDirective) 567 O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" 568 << getFunctionNumber() << '_' << uid; 569 } 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->getUsedDirective() != 0) // 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 O << ".reference .constructors_used\n"; 602 return true; 603 } 604 605 if (GV->getName() == "llvm.global_dtors") { 606 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection()); 607 EmitAlignment(Align, 0); 608 EmitXXStructorList(GV->getInitializer()); 609 610 if (TM.getRelocationModel() == Reloc::Static && 611 MAI->hasStaticCtorDtorReferenceInStaticMode()) 612 O << ".reference .destructors_used\n"; 613 return true; 614 } 615 616 return false; 617} 618 619/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each 620/// global in the specified llvm.used list for which emitUsedDirectiveFor 621/// is true, as being used with this directive. 622void AsmPrinter::EmitLLVMUsedList(Constant *List) { 623 const char *Directive = MAI->getUsedDirective(); 624 625 // Should be an array of 'i8*'. 626 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 627 if (InitList == 0) return; 628 629 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 630 const GlobalValue *GV = 631 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts()); 632 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) { 633 O << Directive; 634 EmitConstantValueOnly(InitList->getOperand(i)); 635 O << '\n'; 636 } 637 } 638} 639 640/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 641/// function pointers, ignoring the init priority. 642void AsmPrinter::EmitXXStructorList(Constant *List) { 643 // Should be an array of '{ int, void ()* }' structs. The first value is the 644 // init priority, which we ignore. 645 if (!isa<ConstantArray>(List)) return; 646 ConstantArray *InitList = cast<ConstantArray>(List); 647 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 648 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 649 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 650 651 if (CS->getOperand(1)->isNullValue()) 652 return; // Found a null terminator, exit printing. 653 // Emit the function pointer. 654 EmitGlobalConstant(CS->getOperand(1)); 655 } 656} 657 658//===--------------------------------------------------------------------===// 659// Emission and print routines 660// 661 662/// EmitInt8 - Emit a byte directive and value. 663/// 664void AsmPrinter::EmitInt8(int Value) const { 665 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/); 666} 667 668/// EmitInt16 - Emit a short directive and value. 669/// 670void AsmPrinter::EmitInt16(int Value) const { 671 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/); 672} 673 674/// EmitInt32 - Emit a long directive and value. 675/// 676void AsmPrinter::EmitInt32(int Value) const { 677 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/); 678} 679 680/// EmitInt64 - Emit a long long directive and value. 681/// 682void AsmPrinter::EmitInt64(uint64_t Value) const { 683 OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/); 684} 685 686 687/// toOctal - Convert the low order bits of X into an octal digit. 688/// 689static inline char toOctal(int X) { 690 return (X&7)+'0'; 691} 692 693/// printStringChar - Print a char, escaped if necessary. 694/// 695static void printStringChar(formatted_raw_ostream &O, unsigned char C) { 696 if (C == '"') { 697 O << "\\\""; 698 } else if (C == '\\') { 699 O << "\\\\"; 700 } else if (isprint((unsigned char)C)) { 701 O << C; 702 } else { 703 switch(C) { 704 case '\b': O << "\\b"; break; 705 case '\f': O << "\\f"; break; 706 case '\n': O << "\\n"; break; 707 case '\r': O << "\\r"; break; 708 case '\t': O << "\\t"; break; 709 default: 710 O << '\\'; 711 O << toOctal(C >> 6); 712 O << toOctal(C >> 3); 713 O << toOctal(C >> 0); 714 break; 715 } 716 } 717} 718 719/// EmitFile - Emit a .file directive. 720void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const { 721 O << "\t.file\t" << Number << " \""; 722 for (unsigned i = 0, N = Name.size(); i < N; ++i) 723 printStringChar(O, Name[i]); 724 O << '\"'; 725} 726 727 728//===----------------------------------------------------------------------===// 729 730// EmitAlignment - Emit an alignment directive to the specified power of 731// two boundary. For example, if you pass in 3 here, you will get an 8 732// byte alignment. If a global value is specified, and if that global has 733// an explicit alignment requested, it will unconditionally override the 734// alignment request. However, if ForcedAlignBits is specified, this value 735// has final say: the ultimate alignment will be the max of ForcedAlignBits 736// and the alignment computed with NumBits and the global. 737// 738// The algorithm is: 739// Align = NumBits; 740// if (GV && GV->hasalignment) Align = GV->getalignment(); 741// Align = std::max(Align, ForcedAlignBits); 742// 743void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 744 unsigned ForcedAlignBits, 745 bool UseFillExpr) const { 746 if (GV && GV->getAlignment()) 747 NumBits = Log2_32(GV->getAlignment()); 748 NumBits = std::max(NumBits, ForcedAlignBits); 749 750 if (NumBits == 0) return; // No need to emit alignment. 751 752 unsigned FillValue = 0; 753 if (getCurrentSection()->getKind().isText()) 754 FillValue = MAI->getTextAlignFillValue(); 755 756 OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0); 757} 758 759// Print out the specified constant, without a storage class. Only the 760// constants valid in constant expressions can occur here. 761void AsmPrinter::EmitConstantValueOnly(const Constant *CV) { 762 if (CV->isNullValue() || isa<UndefValue>(CV)) { 763 O << '0'; 764 return; 765 } 766 767 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 768 O << CI->getZExtValue(); 769 return; 770 } 771 772 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) { 773 // This is a constant address for a global variable or function. Use the 774 // name of the variable or function as the address value. 775 O << *GetGlobalValueSymbol(GV); 776 return; 777 } 778 779 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) { 780 O << *GetBlockAddressSymbol(BA); 781 return; 782 } 783 784 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV); 785 if (CE == 0) { 786 llvm_unreachable("Unknown constant value!"); 787 O << '0'; 788 return; 789 } 790 791 switch (CE->getOpcode()) { 792 case Instruction::ZExt: 793 case Instruction::SExt: 794 case Instruction::FPTrunc: 795 case Instruction::FPExt: 796 case Instruction::UIToFP: 797 case Instruction::SIToFP: 798 case Instruction::FPToUI: 799 case Instruction::FPToSI: 800 default: 801 llvm_unreachable("FIXME: Don't support this constant cast expr"); 802 case Instruction::GetElementPtr: { 803 // generate a symbolic expression for the byte address 804 const TargetData *TD = TM.getTargetData(); 805 const Constant *ptrVal = CE->getOperand(0); 806 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 807 int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], 808 idxVec.size()); 809 if (Offset == 0) 810 return EmitConstantValueOnly(ptrVal); 811 812 // Truncate/sext the offset to the pointer size. 813 if (TD->getPointerSizeInBits() != 64) { 814 int SExtAmount = 64-TD->getPointerSizeInBits(); 815 Offset = (Offset << SExtAmount) >> SExtAmount; 816 } 817 818 if (Offset) 819 O << '('; 820 EmitConstantValueOnly(ptrVal); 821 if (Offset > 0) 822 O << ") + " << Offset; 823 else 824 O << ") - " << -Offset; 825 return; 826 } 827 case Instruction::BitCast: 828 return EmitConstantValueOnly(CE->getOperand(0)); 829 830 case Instruction::IntToPtr: { 831 // Handle casts to pointers by changing them into casts to the appropriate 832 // integer type. This promotes constant folding and simplifies this code. 833 const TargetData *TD = TM.getTargetData(); 834 Constant *Op = CE->getOperand(0); 835 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()), 836 false/*ZExt*/); 837 return EmitConstantValueOnly(Op); 838 } 839 840 case Instruction::PtrToInt: { 841 // Support only foldable casts to/from pointers that can be eliminated by 842 // changing the pointer to the appropriately sized integer type. 843 Constant *Op = CE->getOperand(0); 844 const Type *Ty = CE->getType(); 845 const TargetData *TD = TM.getTargetData(); 846 847 // We can emit the pointer value into this slot if the slot is an 848 // integer slot greater or equal to the size of the pointer. 849 if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType())) 850 return EmitConstantValueOnly(Op); 851 852 O << "(("; 853 EmitConstantValueOnly(Op); 854 APInt ptrMask = 855 APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType())); 856 857 SmallString<40> S; 858 ptrMask.toStringUnsigned(S); 859 O << ") & " << S.str() << ')'; 860 return; 861 } 862 863 case Instruction::Trunc: 864 // We emit the value and depend on the assembler to truncate the generated 865 // expression properly. This is important for differences between 866 // blockaddress labels. Since the two labels are in the same function, it 867 // is reasonable to treat their delta as a 32-bit value. 868 return EmitConstantValueOnly(CE->getOperand(0)); 869 870 case Instruction::Add: 871 case Instruction::Sub: 872 case Instruction::And: 873 case Instruction::Or: 874 case Instruction::Xor: 875 O << '('; 876 EmitConstantValueOnly(CE->getOperand(0)); 877 O << ')'; 878 switch (CE->getOpcode()) { 879 case Instruction::Add: 880 O << " + "; 881 break; 882 case Instruction::Sub: 883 O << " - "; 884 break; 885 case Instruction::And: 886 O << " & "; 887 break; 888 case Instruction::Or: 889 O << " | "; 890 break; 891 case Instruction::Xor: 892 O << " ^ "; 893 break; 894 default: 895 break; 896 } 897 O << '('; 898 EmitConstantValueOnly(CE->getOperand(1)); 899 O << ')'; 900 break; 901 } 902} 903 904static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace, 905 AsmPrinter &AP) { 906 if (AddrSpace != 0 || !CA->isString()) { 907 // Not a string. Print the values in successive locations 908 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 909 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace); 910 return; 911 } 912 913 // Otherwise, it can be emitted as .ascii. 914 SmallVector<char, 128> TmpVec; 915 TmpVec.reserve(CA->getNumOperands()); 916 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 917 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue()); 918 919 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace); 920} 921 922static void EmitGlobalConstantVector(const ConstantVector *CV, 923 unsigned AddrSpace, AsmPrinter &AP) { 924 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i) 925 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace); 926} 927 928static void EmitGlobalConstantStruct(const ConstantStruct *CS, 929 unsigned AddrSpace, AsmPrinter &AP) { 930 // Print the fields in successive locations. Pad to align if needed! 931 const TargetData *TD = AP.TM.getTargetData(); 932 unsigned Size = TD->getTypeAllocSize(CS->getType()); 933 const StructLayout *Layout = TD->getStructLayout(CS->getType()); 934 uint64_t SizeSoFar = 0; 935 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) { 936 const Constant *Field = CS->getOperand(i); 937 938 // Check if padding is needed and insert one or more 0s. 939 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType()); 940 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1)) 941 - Layout->getElementOffset(i)) - FieldSize; 942 SizeSoFar += FieldSize + PadSize; 943 944 // Now print the actual field value. 945 AP.EmitGlobalConstant(Field, AddrSpace); 946 947 // Insert padding - this may include padding to increase the size of the 948 // current field up to the ABI size (if the struct is not packed) as well 949 // as padding to ensure that the next field starts at the right offset. 950 AP.OutStreamer.EmitZeros(PadSize, AddrSpace); 951 } 952 assert(SizeSoFar == Layout->getSizeInBytes() && 953 "Layout of constant struct may be incorrect!"); 954} 955 956static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace, 957 AsmPrinter &AP) { 958 // FP Constants are printed as integer constants to avoid losing 959 // precision. 960 if (CFP->getType()->isDoubleTy()) { 961 if (AP.VerboseAsm) { 962 double Val = CFP->getValueAPF().convertToDouble(); 963 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n'; 964 } 965 966 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 967 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 968 return; 969 } 970 971 if (CFP->getType()->isFloatTy()) { 972 if (AP.VerboseAsm) { 973 float Val = CFP->getValueAPF().convertToFloat(); 974 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n'; 975 } 976 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 977 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace); 978 return; 979 } 980 981 if (CFP->getType()->isX86_FP80Ty()) { 982 // all long double variants are printed as hex 983 // api needed to prevent premature destruction 984 APInt API = CFP->getValueAPF().bitcastToAPInt(); 985 const uint64_t *p = API.getRawData(); 986 if (AP.VerboseAsm) { 987 // Convert to double so we can print the approximate val as a comment. 988 APFloat DoubleVal = CFP->getValueAPF(); 989 bool ignored; 990 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 991 &ignored); 992 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= " 993 << DoubleVal.convertToDouble() << '\n'; 994 } 995 996 if (AP.TM.getTargetData()->isBigEndian()) { 997 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 998 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 999 } else { 1000 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1001 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 1002 } 1003 1004 // Emit the tail padding for the long double. 1005 const TargetData &TD = *AP.TM.getTargetData(); 1006 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) - 1007 TD.getTypeStoreSize(CFP->getType()), AddrSpace); 1008 return; 1009 } 1010 1011 assert(CFP->getType()->isPPC_FP128Ty() && 1012 "Floating point constant type not handled"); 1013 // All long double variants are printed as hex api needed to prevent 1014 // premature destruction. 1015 APInt API = CFP->getValueAPF().bitcastToAPInt(); 1016 const uint64_t *p = API.getRawData(); 1017 if (AP.TM.getTargetData()->isBigEndian()) { 1018 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1019 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 1020 } else { 1021 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 1022 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1023 } 1024} 1025 1026static void EmitGlobalConstantLargeInt(const ConstantInt *CI, 1027 unsigned AddrSpace, AsmPrinter &AP) { 1028 const TargetData *TD = AP.TM.getTargetData(); 1029 unsigned BitWidth = CI->getBitWidth(); 1030 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits"); 1031 1032 // We don't expect assemblers to support integer data directives 1033 // for more than 64 bits, so we emit the data in at most 64-bit 1034 // quantities at a time. 1035 const uint64_t *RawData = CI->getValue().getRawData(); 1036 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1037 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i]; 1038 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 1039 } 1040} 1041 1042/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 1043void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { 1044 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) { 1045 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1046 return OutStreamer.EmitZeros(Size, AddrSpace); 1047 } 1048 1049 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1050 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1051 switch (Size) { 1052 case 1: 1053 case 2: 1054 case 4: 1055 case 8: 1056 if (VerboseAsm) 1057 OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue()); 1058 OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace); 1059 return; 1060 default: 1061 EmitGlobalConstantLargeInt(CI, AddrSpace, *this); 1062 return; 1063 } 1064 } 1065 1066 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) 1067 return EmitGlobalConstantArray(CVA, AddrSpace, *this); 1068 1069 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) 1070 return EmitGlobalConstantStruct(CVS, AddrSpace, *this); 1071 1072 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) 1073 return EmitGlobalConstantFP(CFP, AddrSpace, *this); 1074 1075 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV)) 1076 return EmitGlobalConstantVector(V, AddrSpace, *this); 1077 1078 if (isa<ConstantPointerNull>(CV)) { 1079 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1080 OutStreamer.EmitIntValue(0, Size, AddrSpace); 1081 return; 1082 } 1083 1084 // Otherwise, it must be a ConstantExpr. Emit the data directive, then emit 1085 // the expression value. 1086 switch (TM.getTargetData()->getTypeAllocSize(CV->getType())) { 1087 case 0: return; 1088 case 1: O << MAI->getData8bitsDirective(AddrSpace); break; 1089 case 2: O << MAI->getData16bitsDirective(AddrSpace); break; 1090 case 4: O << MAI->getData32bitsDirective(AddrSpace); break; 1091 case 8: 1092 if (const char *Dir = MAI->getData64bitsDirective(AddrSpace)) { 1093 O << Dir; 1094 break; 1095 } 1096 // FALL THROUGH. 1097 default: 1098 llvm_unreachable("Target cannot handle given data directive width!"); 1099 return; 1100 } 1101 1102 EmitConstantValueOnly(CV); 1103 O << '\n'; 1104} 1105 1106void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1107 // Target doesn't support this yet! 1108 llvm_unreachable("Target does not support EmitMachineConstantPoolValue"); 1109} 1110 1111/// PrintSpecial - Print information related to the specified machine instr 1112/// that is independent of the operand, and may be independent of the instr 1113/// itself. This can be useful for portably encoding the comment character 1114/// or other bits of target-specific knowledge into the asmstrings. The 1115/// syntax used is ${:comment}. Targets can override this to add support 1116/// for their own strange codes. 1117void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const { 1118 if (!strcmp(Code, "private")) { 1119 O << MAI->getPrivateGlobalPrefix(); 1120 } else if (!strcmp(Code, "comment")) { 1121 if (VerboseAsm) 1122 O << MAI->getCommentString(); 1123 } else if (!strcmp(Code, "uid")) { 1124 // Comparing the address of MI isn't sufficient, because machineinstrs may 1125 // be allocated to the same address across functions. 1126 const Function *ThisF = MI->getParent()->getParent()->getFunction(); 1127 1128 // If this is a new LastFn instruction, bump the counter. 1129 if (LastMI != MI || LastFn != ThisF) { 1130 ++Counter; 1131 LastMI = MI; 1132 LastFn = ThisF; 1133 } 1134 O << Counter; 1135 } else { 1136 std::string msg; 1137 raw_string_ostream Msg(msg); 1138 Msg << "Unknown special formatter '" << Code 1139 << "' for machine instr: " << *MI; 1140 llvm_report_error(Msg.str()); 1141 } 1142} 1143 1144/// processDebugLoc - Processes the debug information of each machine 1145/// instruction's DebugLoc. 1146void AsmPrinter::processDebugLoc(const MachineInstr *MI, 1147 bool BeforePrintingInsn) { 1148 if (!MAI || !DW || !MAI->doesSupportDebugInformation() 1149 || !DW->ShouldEmitDwarfDebug()) 1150 return; 1151 DebugLoc DL = MI->getDebugLoc(); 1152 if (DL.isUnknown()) 1153 return; 1154 DILocation CurDLT = MF->getDILocation(DL); 1155 if (CurDLT.getScope().isNull()) 1156 return; 1157 1158 if (!BeforePrintingInsn) { 1159 // After printing instruction 1160 DW->EndScope(MI); 1161 } else if (CurDLT.getNode() != PrevDLT) { 1162 unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(), 1163 CurDLT.getColumnNumber(), 1164 CurDLT.getScope().getNode()); 1165 printLabel(L); 1166 O << '\n'; 1167 DW->BeginScope(MI, L); 1168 PrevDLT = CurDLT.getNode(); 1169 } 1170} 1171 1172 1173/// printInlineAsm - This method formats and prints the specified machine 1174/// instruction that is an inline asm. 1175void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { 1176 unsigned NumOperands = MI->getNumOperands(); 1177 1178 // Count the number of register definitions. 1179 unsigned NumDefs = 0; 1180 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef(); 1181 ++NumDefs) 1182 assert(NumDefs != NumOperands-1 && "No asm string?"); 1183 1184 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?"); 1185 1186 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. 1187 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); 1188 1189 O << '\t'; 1190 1191 // If this asmstr is empty, just print the #APP/#NOAPP markers. 1192 // These are useful to see where empty asm's wound up. 1193 if (AsmStr[0] == 0) { 1194 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1195 O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n'; 1196 return; 1197 } 1198 1199 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1200 1201 // The variant of the current asmprinter. 1202 int AsmPrinterVariant = MAI->getAssemblerDialect(); 1203 1204 int CurVariant = -1; // The number of the {.|.|.} region we are in. 1205 const char *LastEmitted = AsmStr; // One past the last character emitted. 1206 1207 while (*LastEmitted) { 1208 switch (*LastEmitted) { 1209 default: { 1210 // Not a special case, emit the string section literally. 1211 const char *LiteralEnd = LastEmitted+1; 1212 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && 1213 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') 1214 ++LiteralEnd; 1215 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1216 O.write(LastEmitted, LiteralEnd-LastEmitted); 1217 LastEmitted = LiteralEnd; 1218 break; 1219 } 1220 case '\n': 1221 ++LastEmitted; // Consume newline character. 1222 O << '\n'; // Indent code with newline. 1223 break; 1224 case '$': { 1225 ++LastEmitted; // Consume '$' character. 1226 bool Done = true; 1227 1228 // Handle escapes. 1229 switch (*LastEmitted) { 1230 default: Done = false; break; 1231 case '$': // $$ -> $ 1232 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1233 O << '$'; 1234 ++LastEmitted; // Consume second '$' character. 1235 break; 1236 case '(': // $( -> same as GCC's { character. 1237 ++LastEmitted; // Consume '(' character. 1238 if (CurVariant != -1) { 1239 llvm_report_error("Nested variants found in inline asm string: '" 1240 + std::string(AsmStr) + "'"); 1241 } 1242 CurVariant = 0; // We're in the first variant now. 1243 break; 1244 case '|': 1245 ++LastEmitted; // consume '|' character. 1246 if (CurVariant == -1) 1247 O << '|'; // this is gcc's behavior for | outside a variant 1248 else 1249 ++CurVariant; // We're in the next variant. 1250 break; 1251 case ')': // $) -> same as GCC's } char. 1252 ++LastEmitted; // consume ')' character. 1253 if (CurVariant == -1) 1254 O << '}'; // this is gcc's behavior for } outside a variant 1255 else 1256 CurVariant = -1; 1257 break; 1258 } 1259 if (Done) break; 1260 1261 bool HasCurlyBraces = false; 1262 if (*LastEmitted == '{') { // ${variable} 1263 ++LastEmitted; // Consume '{' character. 1264 HasCurlyBraces = true; 1265 } 1266 1267 // If we have ${:foo}, then this is not a real operand reference, it is a 1268 // "magic" string reference, just like in .td files. Arrange to call 1269 // PrintSpecial. 1270 if (HasCurlyBraces && *LastEmitted == ':') { 1271 ++LastEmitted; 1272 const char *StrStart = LastEmitted; 1273 const char *StrEnd = strchr(StrStart, '}'); 1274 if (StrEnd == 0) { 1275 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '" 1276 + std::string(AsmStr) + "'"); 1277 } 1278 1279 std::string Val(StrStart, StrEnd); 1280 PrintSpecial(MI, Val.c_str()); 1281 LastEmitted = StrEnd+1; 1282 break; 1283 } 1284 1285 const char *IDStart = LastEmitted; 1286 char *IDEnd; 1287 errno = 0; 1288 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. 1289 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { 1290 llvm_report_error("Bad $ operand number in inline asm string: '" 1291 + std::string(AsmStr) + "'"); 1292 } 1293 LastEmitted = IDEnd; 1294 1295 char Modifier[2] = { 0, 0 }; 1296 1297 if (HasCurlyBraces) { 1298 // If we have curly braces, check for a modifier character. This 1299 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. 1300 if (*LastEmitted == ':') { 1301 ++LastEmitted; // Consume ':' character. 1302 if (*LastEmitted == 0) { 1303 llvm_report_error("Bad ${:} expression in inline asm string: '" 1304 + std::string(AsmStr) + "'"); 1305 } 1306 1307 Modifier[0] = *LastEmitted; 1308 ++LastEmitted; // Consume modifier character. 1309 } 1310 1311 if (*LastEmitted != '}') { 1312 llvm_report_error("Bad ${} expression in inline asm string: '" 1313 + std::string(AsmStr) + "'"); 1314 } 1315 ++LastEmitted; // Consume '}' character. 1316 } 1317 1318 if ((unsigned)Val >= NumOperands-1) { 1319 llvm_report_error("Invalid $ operand number in inline asm string: '" 1320 + std::string(AsmStr) + "'"); 1321 } 1322 1323 // Okay, we finally have a value number. Ask the target to print this 1324 // operand! 1325 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { 1326 unsigned OpNo = 1; 1327 1328 bool Error = false; 1329 1330 // Scan to find the machine operand number for the operand. 1331 for (; Val; --Val) { 1332 if (OpNo >= MI->getNumOperands()) break; 1333 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1334 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1; 1335 } 1336 1337 if (OpNo >= MI->getNumOperands()) { 1338 Error = true; 1339 } else { 1340 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1341 ++OpNo; // Skip over the ID number. 1342 1343 if (Modifier[0] == 'l') // labels are target independent 1344 O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber()); 1345 else { 1346 AsmPrinter *AP = const_cast<AsmPrinter*>(this); 1347 if ((OpFlags & 7) == 4) { 1348 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, 1349 Modifier[0] ? Modifier : 0); 1350 } else { 1351 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, 1352 Modifier[0] ? Modifier : 0); 1353 } 1354 } 1355 } 1356 if (Error) { 1357 std::string msg; 1358 raw_string_ostream Msg(msg); 1359 Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n"; 1360 MI->print(Msg); 1361 llvm_report_error(Msg.str()); 1362 } 1363 } 1364 break; 1365 } 1366 } 1367 } 1368 O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd(); 1369} 1370 1371/// printImplicitDef - This method prints the specified machine instruction 1372/// that is an implicit def. 1373void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { 1374 if (!VerboseAsm) return; 1375 O.PadToColumn(MAI->getCommentColumn()); 1376 O << MAI->getCommentString() << " implicit-def: " 1377 << TRI->getName(MI->getOperand(0).getReg()); 1378} 1379 1380void AsmPrinter::printKill(const MachineInstr *MI) const { 1381 if (!VerboseAsm) return; 1382 O.PadToColumn(MAI->getCommentColumn()); 1383 O << MAI->getCommentString() << " kill:"; 1384 for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) { 1385 const MachineOperand &op = MI->getOperand(n); 1386 assert(op.isReg() && "KILL instruction must have only register operands"); 1387 O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>"); 1388 } 1389} 1390 1391/// printLabel - This method prints a local label used by debug and 1392/// exception handling tables. 1393void AsmPrinter::printLabel(const MachineInstr *MI) const { 1394 printLabel(MI->getOperand(0).getImm()); 1395} 1396 1397void AsmPrinter::printLabel(unsigned Id) const { 1398 O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':'; 1399} 1400 1401/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 1402/// instruction, using the specified assembler variant. Targets should 1403/// override this to format as appropriate. 1404bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 1405 unsigned AsmVariant, const char *ExtraCode) { 1406 // Target doesn't support this yet! 1407 return true; 1408} 1409 1410bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 1411 unsigned AsmVariant, 1412 const char *ExtraCode) { 1413 // Target doesn't support this yet! 1414 return true; 1415} 1416 1417MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA, 1418 const char *Suffix) const { 1419 return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix); 1420} 1421 1422MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F, 1423 const BasicBlock *BB, 1424 const char *Suffix) const { 1425 assert(BB->hasName() && 1426 "Address of anonymous basic block not supported yet!"); 1427 1428 // This code must use the function name itself, and not the function number, 1429 // since it must be possible to generate the label name from within other 1430 // functions. 1431 SmallString<60> FnName; 1432 Mang->getNameWithPrefix(FnName, F, false); 1433 1434 // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME! 1435 SmallString<60> NameResult; 1436 Mang->getNameWithPrefix(NameResult, 1437 StringRef("BA") + Twine((unsigned)FnName.size()) + 1438 "_" + FnName.str() + "_" + BB->getName() + Suffix, 1439 Mangler::Private); 1440 1441 return OutContext.GetOrCreateSymbol(NameResult.str()); 1442} 1443 1444MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const { 1445 SmallString<60> Name; 1446 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB" 1447 << getFunctionNumber() << '_' << MBBID; 1448 1449 return OutContext.GetOrCreateSymbol(Name.str()); 1450} 1451 1452/// GetGlobalValueSymbol - Return the MCSymbol for the specified global 1453/// value. 1454MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const { 1455 SmallString<60> NameStr; 1456 Mang->getNameWithPrefix(NameStr, GV, false); 1457 return OutContext.GetOrCreateSymbol(NameStr.str()); 1458} 1459 1460/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with 1461/// global value name as its base, with the specified suffix, and where the 1462/// symbol is forced to have private linkage if ForcePrivate is true. 1463MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV, 1464 StringRef Suffix, 1465 bool ForcePrivate) const { 1466 SmallString<60> NameStr; 1467 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate); 1468 NameStr.append(Suffix.begin(), Suffix.end()); 1469 return OutContext.GetOrCreateSymbol(NameStr.str()); 1470} 1471 1472/// GetExternalSymbolSymbol - Return the MCSymbol for the specified 1473/// ExternalSymbol. 1474MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const { 1475 SmallString<60> NameStr; 1476 Mang->getNameWithPrefix(NameStr, Sym); 1477 return OutContext.GetOrCreateSymbol(NameStr.str()); 1478} 1479 1480 1481 1482/// PrintParentLoopComment - Print comments about parent loops of this one. 1483static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1484 unsigned FunctionNumber) { 1485 if (Loop == 0) return; 1486 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber); 1487 OS.indent(Loop->getLoopDepth()*2) 1488 << "Parent Loop BB" << FunctionNumber << "_" 1489 << Loop->getHeader()->getNumber() 1490 << " Depth=" << Loop->getLoopDepth() << '\n'; 1491} 1492 1493 1494/// PrintChildLoopComment - Print comments about child loops within 1495/// the loop for this basic block, with nesting. 1496static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1497 unsigned FunctionNumber) { 1498 // Add child loop information 1499 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){ 1500 OS.indent((*CL)->getLoopDepth()*2) 1501 << "Child Loop BB" << FunctionNumber << "_" 1502 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth() 1503 << '\n'; 1504 PrintChildLoopComment(OS, *CL, FunctionNumber); 1505 } 1506} 1507 1508/// EmitComments - Pretty-print comments for basic blocks. 1509static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB, 1510 const MachineLoopInfo *LI, 1511 const AsmPrinter &AP) { 1512 // Add loop depth information 1513 const MachineLoop *Loop = LI->getLoopFor(&MBB); 1514 if (Loop == 0) return; 1515 1516 MachineBasicBlock *Header = Loop->getHeader(); 1517 assert(Header && "No header for loop"); 1518 1519 // If this block is not a loop header, just print out what is the loop header 1520 // and return. 1521 if (Header != &MBB) { 1522 AP.OutStreamer.AddComment(" in Loop: Header=BB" + 1523 Twine(AP.getFunctionNumber())+"_" + 1524 Twine(Loop->getHeader()->getNumber())+ 1525 " Depth="+Twine(Loop->getLoopDepth())); 1526 return; 1527 } 1528 1529 // Otherwise, it is a loop header. Print out information about child and 1530 // parent loops. 1531 raw_ostream &OS = AP.OutStreamer.GetCommentOS(); 1532 1533 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber()); 1534 1535 OS << "=>"; 1536 OS.indent(Loop->getLoopDepth()*2-2); 1537 1538 OS << "This "; 1539 if (Loop->empty()) 1540 OS << "Inner "; 1541 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n'; 1542 1543 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber()); 1544} 1545 1546 1547/// EmitBasicBlockStart - This method prints the label for the specified 1548/// MachineBasicBlock, an alignment (if present) and a comment describing 1549/// it if appropriate. 1550void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { 1551 // Emit an alignment directive for this block, if needed. 1552 if (unsigned Align = MBB->getAlignment()) 1553 EmitAlignment(Log2_32(Align)); 1554 1555 // If the block has its address taken, emit a special label to satisfy 1556 // references to the block. This is done so that we don't need to 1557 // remember the number of this label, and so that we can make 1558 // forward references to labels without knowing what their numbers 1559 // will be. 1560 if (MBB->hasAddressTaken()) { 1561 const BasicBlock *BB = MBB->getBasicBlock(); 1562 if (VerboseAsm) 1563 OutStreamer.AddComment("Address Taken"); 1564 OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB)); 1565 } 1566 1567 // Print the main label for the block. 1568 if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) { 1569 if (VerboseAsm) { 1570 O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':'; 1571 if (const BasicBlock *BB = MBB->getBasicBlock()) 1572 if (BB->hasName()) 1573 OutStreamer.AddComment("%" + BB->getName()); 1574 1575 PrintBasicBlockLoopComments(*MBB, LI, *this); 1576 OutStreamer.AddBlankLine(); 1577 } 1578 } else { 1579 if (VerboseAsm) { 1580 if (const BasicBlock *BB = MBB->getBasicBlock()) 1581 if (BB->hasName()) 1582 OutStreamer.AddComment("%" + BB->getName()); 1583 PrintBasicBlockLoopComments(*MBB, LI, *this); 1584 } 1585 1586 OutStreamer.EmitLabel(GetMBBSymbol(MBB->getNumber())); 1587 } 1588} 1589 1590/// printPICJumpTableSetLabel - This method prints a set label for the 1591/// specified MachineBasicBlock for a jumptable entry. 1592void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, 1593 const MachineBasicBlock *MBB) const { 1594 if (!MAI->getSetDirective()) 1595 return; 1596 1597 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix() 1598 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',' 1599 << *GetMBBSymbol(MBB->getNumber()) 1600 << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1601 << '_' << uid << '\n'; 1602} 1603 1604void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2, 1605 const MachineBasicBlock *MBB) const { 1606 if (!MAI->getSetDirective()) 1607 return; 1608 1609 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix() 1610 << getFunctionNumber() << '_' << uid << '_' << uid2 1611 << "_set_" << MBB->getNumber() << ',' 1612 << *GetMBBSymbol(MBB->getNumber()) 1613 << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1614 << '_' << uid << '_' << uid2 << '\n'; 1615} 1616 1617void AsmPrinter::printVisibility(const MCSymbol *Sym, 1618 unsigned Visibility) const { 1619 if (Visibility == GlobalValue::HiddenVisibility) { 1620 if (const char *Directive = MAI->getHiddenDirective()) 1621 O << Directive << *Sym << '\n'; 1622 } else if (Visibility == GlobalValue::ProtectedVisibility) { 1623 if (const char *Directive = MAI->getProtectedDirective()) 1624 O << Directive << *Sym << '\n'; 1625 } 1626} 1627 1628void AsmPrinter::printOffset(int64_t Offset) const { 1629 if (Offset > 0) 1630 O << '+' << Offset; 1631 else if (Offset < 0) 1632 O << Offset; 1633} 1634 1635GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1636 if (!S->usesMetadata()) 1637 return 0; 1638 1639 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1640 if (GCPI != GCMetadataPrinters.end()) 1641 return GCPI->second; 1642 1643 const char *Name = S->getName().c_str(); 1644 1645 for (GCMetadataPrinterRegistry::iterator 1646 I = GCMetadataPrinterRegistry::begin(), 1647 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1648 if (strcmp(Name, I->getName()) == 0) { 1649 GCMetadataPrinter *GMP = I->instantiate(); 1650 GMP->S = S; 1651 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1652 return GMP; 1653 } 1654 1655 errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n"; 1656 llvm_unreachable(0); 1657} 1658 1659/// EmitComments - Pretty-print comments for instructions 1660void AsmPrinter::EmitComments(const MachineInstr &MI) const { 1661 if (!VerboseAsm) 1662 return; 1663 1664 bool Newline = false; 1665 1666 if (!MI.getDebugLoc().isUnknown()) { 1667 DILocation DLT = MF->getDILocation(MI.getDebugLoc()); 1668 1669 // Print source line info. 1670 O.PadToColumn(MAI->getCommentColumn()); 1671 O << MAI->getCommentString() << ' '; 1672 DIScope Scope = DLT.getScope(); 1673 // Omit the directory, because it's likely to be long and uninteresting. 1674 if (!Scope.isNull()) 1675 O << Scope.getFilename(); 1676 else 1677 O << "<unknown>"; 1678 O << ':' << DLT.getLineNumber(); 1679 if (DLT.getColumnNumber() != 0) 1680 O << ':' << DLT.getColumnNumber(); 1681 Newline = true; 1682 } 1683 1684 // Check for spills and reloads 1685 int FI; 1686 1687 const MachineFrameInfo *FrameInfo = 1688 MI.getParent()->getParent()->getFrameInfo(); 1689 1690 // We assume a single instruction only has a spill or reload, not 1691 // both. 1692 const MachineMemOperand *MMO; 1693 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) { 1694 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1695 MMO = *MI.memoperands_begin(); 1696 if (Newline) O << '\n'; 1697 O.PadToColumn(MAI->getCommentColumn()); 1698 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload"; 1699 Newline = true; 1700 } 1701 } 1702 else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) { 1703 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1704 if (Newline) O << '\n'; 1705 O.PadToColumn(MAI->getCommentColumn()); 1706 O << MAI->getCommentString() << ' ' 1707 << MMO->getSize() << "-byte Folded Reload"; 1708 Newline = true; 1709 } 1710 } 1711 else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) { 1712 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1713 MMO = *MI.memoperands_begin(); 1714 if (Newline) O << '\n'; 1715 O.PadToColumn(MAI->getCommentColumn()); 1716 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill"; 1717 Newline = true; 1718 } 1719 } 1720 else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) { 1721 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1722 if (Newline) O << '\n'; 1723 O.PadToColumn(MAI->getCommentColumn()); 1724 O << MAI->getCommentString() << ' ' 1725 << MMO->getSize() << "-byte Folded Spill"; 1726 Newline = true; 1727 } 1728 } 1729 1730 // Check for spill-induced copies 1731 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx; 1732 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg, 1733 SrcSubIdx, DstSubIdx)) { 1734 if (MI.getAsmPrinterFlag(ReloadReuse)) { 1735 if (Newline) O << '\n'; 1736 O.PadToColumn(MAI->getCommentColumn()); 1737 O << MAI->getCommentString() << " Reload Reuse"; 1738 } 1739 } 1740} 1741 1742