AsmPrinter.cpp revision 53ee5d89754b820e34a431d6491b24e281eb86bb
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 if (MAI->hasSingleParameterDotFile()) { 119 // Very minimal debug info. It is ignored if we emit actual 120 // debug info. If we don't, this at least helps the user find where 121 // a function came from. 122 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n"; 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 O << "\t.type\t" << *GVSym; 161 if (MAI->getCommentString()[0] != '@') 162 O << ",@object\n"; 163 else 164 O << ",%object\n"; 165 } 166 167 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM); 168 169 const TargetData *TD = TM.getTargetData(); 170 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType()); 171 unsigned AlignLog = TD->getPreferredAlignmentLog(GV); 172 173 // Handle common and BSS local symbols (.lcomm). 174 if (GVKind.isCommon() || GVKind.isBSSLocal()) { 175 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 176 177 if (VerboseAsm) { 178 WriteAsOperand(OutStreamer.GetCommentOS(), GV, 179 /*PrintType=*/false, GV->getParent()); 180 OutStreamer.GetCommentOS() << '\n'; 181 } 182 183 // Handle common symbols. 184 if (GVKind.isCommon()) { 185 // .comm _foo, 42, 4 186 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 187 return; 188 } 189 190 // Handle local BSS symbols. 191 if (MAI->hasMachoZeroFillDirective()) { 192 const MCSection *TheSection = 193 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 194 // .zerofill __DATA, __bss, _foo, 400, 5 195 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 196 return; 197 } 198 199 if (MAI->hasLCOMMDirective()) { 200 // .lcomm _foo, 42 201 OutStreamer.EmitLocalCommonSymbol(GVSym, Size); 202 return; 203 } 204 205 // .local _foo 206 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local); 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, MCSA_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, MCSA_Global); 239 // .weak_definition _foo 240 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition); 241 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) { 242 // .globl _foo 243 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 244 // .linkonce same_size 245 O << LinkOnce; 246 } else { 247 // .weak _foo 248 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_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, MCSA_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 // .size foo, 42 279 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext)); 280 281 OutStreamer.AddBlankLine(); 282} 283 284 285bool AsmPrinter::doFinalization(Module &M) { 286 // Emit global variables. 287 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 288 I != E; ++I) 289 EmitGlobalVariable(I); 290 291 // Emit final debug information. 292 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling()) 293 DW->EndModule(); 294 295 // If the target wants to know about weak references, print them all. 296 if (MAI->getWeakRefDirective()) { 297 // FIXME: This is not lazy, it would be nice to only print weak references 298 // to stuff that is actually used. Note that doing so would require targets 299 // to notice uses in operands (due to constant exprs etc). This should 300 // happen with the MC stuff eventually. 301 302 // Print out module-level global variables here. 303 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 304 I != E; ++I) { 305 if (!I->hasExternalWeakLinkage()) continue; 306 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I), 307 MCSA_WeakReference); 308 } 309 310 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) { 311 if (!I->hasExternalWeakLinkage()) continue; 312 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I), 313 MCSA_WeakReference); 314 } 315 } 316 317 if (MAI->getSetDirective()) { 318 OutStreamer.AddBlankLine(); 319 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 320 I != E; ++I) { 321 MCSymbol *Name = GetGlobalValueSymbol(I); 322 323 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 324 MCSymbol *Target = GetGlobalValueSymbol(GV); 325 326 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective()) 327 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global); 328 else if (I->hasWeakLinkage()) 329 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference); 330 else 331 assert(I->hasLocalLinkage() && "Invalid alias linkage"); 332 333 printVisibility(Name, I->getVisibility()); 334 335 O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n'; 336 } 337 } 338 339 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 340 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 341 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 342 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 343 MP->finishAssembly(O, *this, *MAI); 344 345 // If we don't have any trampolines, then we don't require stack memory 346 // to be executable. Some targets have a directive to declare this. 347 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 348 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 349 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext)) 350 OutStreamer.SwitchSection(S); 351 352 // Allow the target to emit any magic that it wants at the end of the file, 353 // after everything else has gone out. 354 EmitEndOfAsmFile(M); 355 356 delete Mang; Mang = 0; 357 DW = 0; MMI = 0; 358 359 OutStreamer.Finish(); 360 return false; 361} 362 363void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 364 // Get the function symbol. 365 CurrentFnSym = GetGlobalValueSymbol(MF.getFunction()); 366 IncrementFunctionNumber(); 367 368 if (VerboseAsm) 369 LI = &getAnalysis<MachineLoopInfo>(); 370} 371 372namespace { 373 // SectionCPs - Keep track the alignment, constpool entries per Section. 374 struct SectionCPs { 375 const MCSection *S; 376 unsigned Alignment; 377 SmallVector<unsigned, 4> CPEs; 378 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {} 379 }; 380} 381 382/// EmitConstantPool - Print to the current output stream assembly 383/// representations of the constants in the constant pool MCP. This is 384/// used to print out constants which have been "spilled to memory" by 385/// the code generator. 386/// 387void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) { 388 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 389 if (CP.empty()) return; 390 391 // Calculate sections for constant pool entries. We collect entries to go into 392 // the same section together to reduce amount of section switch statements. 393 SmallVector<SectionCPs, 4> CPSections; 394 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 395 const MachineConstantPoolEntry &CPE = CP[i]; 396 unsigned Align = CPE.getAlignment(); 397 398 SectionKind Kind; 399 switch (CPE.getRelocationInfo()) { 400 default: llvm_unreachable("Unknown section kind"); 401 case 2: Kind = SectionKind::getReadOnlyWithRel(); break; 402 case 1: 403 Kind = SectionKind::getReadOnlyWithRelLocal(); 404 break; 405 case 0: 406 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) { 407 case 4: Kind = SectionKind::getMergeableConst4(); break; 408 case 8: Kind = SectionKind::getMergeableConst8(); break; 409 case 16: Kind = SectionKind::getMergeableConst16();break; 410 default: Kind = SectionKind::getMergeableConst(); break; 411 } 412 } 413 414 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind); 415 416 // The number of sections are small, just do a linear search from the 417 // last section to the first. 418 bool Found = false; 419 unsigned SecIdx = CPSections.size(); 420 while (SecIdx != 0) { 421 if (CPSections[--SecIdx].S == S) { 422 Found = true; 423 break; 424 } 425 } 426 if (!Found) { 427 SecIdx = CPSections.size(); 428 CPSections.push_back(SectionCPs(S, Align)); 429 } 430 431 if (Align > CPSections[SecIdx].Alignment) 432 CPSections[SecIdx].Alignment = Align; 433 CPSections[SecIdx].CPEs.push_back(i); 434 } 435 436 // Now print stuff into the calculated sections. 437 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) { 438 OutStreamer.SwitchSection(CPSections[i].S); 439 EmitAlignment(Log2_32(CPSections[i].Alignment)); 440 441 unsigned Offset = 0; 442 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) { 443 unsigned CPI = CPSections[i].CPEs[j]; 444 MachineConstantPoolEntry CPE = CP[CPI]; 445 446 // Emit inter-object padding for alignment. 447 unsigned AlignMask = CPE.getAlignment() - 1; 448 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask; 449 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/); 450 451 const Type *Ty = CPE.getType(); 452 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty); 453 454 // Emit the label with a comment on it. 455 if (VerboseAsm) { 456 OutStreamer.GetCommentOS() << "constant pool "; 457 WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(), 458 MF->getFunction()->getParent()); 459 OutStreamer.GetCommentOS() << '\n'; 460 } 461 OutStreamer.EmitLabel(GetCPISymbol(CPI)); 462 463 if (CPE.isMachineConstantPoolEntry()) 464 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); 465 else 466 EmitGlobalConstant(CPE.Val.ConstVal); 467 } 468 } 469} 470 471/// EmitJumpTableInfo - Print assembly representations of the jump tables used 472/// by the current function to the current output stream. 473/// 474void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI, 475 MachineFunction &MF) { 476 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 477 if (JT.empty()) return; 478 479 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 480 481 // Pick the directive to use to print the jump table entries, and switch to 482 // the appropriate section. 483 TargetLowering *LoweringInfo = TM.getTargetLowering(); 484 485 const Function *F = MF.getFunction(); 486 bool JTInDiffSection = false; 487 if (F->isWeakForLinker() || 488 (IsPic && !LoweringInfo->usesGlobalOffsetTable())) { 489 // In PIC mode, we need to emit the jump table to the same section as the 490 // function body itself, otherwise the label differences won't make sense. 491 // We should also do if the section name is NULL or function is declared in 492 // discardable section. 493 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, 494 TM)); 495 } else { 496 // Otherwise, drop it in the readonly section. 497 const MCSection *ReadOnlySection = 498 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly()); 499 OutStreamer.SwitchSection(ReadOnlySection); 500 JTInDiffSection = true; 501 } 502 503 EmitAlignment(Log2_32(MJTI->getAlignment())); 504 505 for (unsigned i = 0, e = JT.size(); i != e; ++i) { 506 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; 507 508 // If this jump table was deleted, ignore it. 509 if (JTBBs.empty()) continue; 510 511 // For PIC codegen, if possible we want to use the SetDirective to reduce 512 // the number of relocations the assembler will generate for the jump table. 513 // Set directives are all printed before the jump table itself. 514 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; 515 if (MAI->getSetDirective() && IsPic) 516 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 517 if (EmittedSets.insert(JTBBs[ii])) 518 printPICJumpTableSetLabel(i, JTBBs[ii]); 519 520 // On some targets (e.g. Darwin) we want to emit two consequtive labels 521 // before each jump table. The first label is never referenced, but tells 522 // the assembler and linker the extents of the jump table object. The 523 // second label is actually referenced by the code. 524 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) 525 OutStreamer.EmitLabel(GetJTISymbol(i, true)); 526 527 OutStreamer.EmitLabel(GetJTISymbol(i)); 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 << '-' << *GetJTISymbol(uid); 568 } 569} 570 571 572/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 573/// special global used by LLVM. If so, emit it and return true, otherwise 574/// do nothing and return false. 575bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 576 if (GV->getName() == "llvm.used") { 577 if (MAI->hasNoDeadStrip()) // No need to emit this at all. 578 EmitLLVMUsedList(GV->getInitializer()); 579 return true; 580 } 581 582 // Ignore debug and non-emitted data. This handles llvm.compiler.used. 583 if (GV->getSection() == "llvm.metadata" || 584 GV->hasAvailableExternallyLinkage()) 585 return true; 586 587 if (!GV->hasAppendingLinkage()) return false; 588 589 assert(GV->hasInitializer() && "Not a special LLVM global!"); 590 591 const TargetData *TD = TM.getTargetData(); 592 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 593 if (GV->getName() == "llvm.global_ctors") { 594 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection()); 595 EmitAlignment(Align, 0); 596 EmitXXStructorList(GV->getInitializer()); 597 598 if (TM.getRelocationModel() == Reloc::Static && 599 MAI->hasStaticCtorDtorReferenceInStaticMode()) { 600 StringRef Sym(".constructors_used"); 601 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 602 MCSA_Reference); 603 } 604 return true; 605 } 606 607 if (GV->getName() == "llvm.global_dtors") { 608 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection()); 609 EmitAlignment(Align, 0); 610 EmitXXStructorList(GV->getInitializer()); 611 612 if (TM.getRelocationModel() == Reloc::Static && 613 MAI->hasStaticCtorDtorReferenceInStaticMode()) { 614 StringRef Sym(".destructors_used"); 615 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 616 MCSA_Reference); 617 } 618 return true; 619 } 620 621 return false; 622} 623 624/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each 625/// global in the specified llvm.used list for which emitUsedDirectiveFor 626/// is true, as being used with this directive. 627void AsmPrinter::EmitLLVMUsedList(Constant *List) { 628 // Should be an array of 'i8*'. 629 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 630 if (InitList == 0) return; 631 632 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 633 const GlobalValue *GV = 634 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts()); 635 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) 636 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV), 637 MCSA_NoDeadStrip); 638 } 639} 640 641/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 642/// function pointers, ignoring the init priority. 643void AsmPrinter::EmitXXStructorList(Constant *List) { 644 // Should be an array of '{ int, void ()* }' structs. The first value is the 645 // init priority, which we ignore. 646 if (!isa<ConstantArray>(List)) return; 647 ConstantArray *InitList = cast<ConstantArray>(List); 648 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 649 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 650 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 651 652 if (CS->getOperand(1)->isNullValue()) 653 return; // Found a null terminator, exit printing. 654 // Emit the function pointer. 655 EmitGlobalConstant(CS->getOperand(1)); 656 } 657} 658 659//===--------------------------------------------------------------------===// 660// Emission and print routines 661// 662 663/// EmitInt8 - Emit a byte directive and value. 664/// 665void AsmPrinter::EmitInt8(int Value) const { 666 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/); 667} 668 669/// EmitInt16 - Emit a short directive and value. 670/// 671void AsmPrinter::EmitInt16(int Value) const { 672 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/); 673} 674 675/// EmitInt32 - Emit a long directive and value. 676/// 677void AsmPrinter::EmitInt32(int Value) const { 678 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/); 679} 680 681/// EmitInt64 - Emit a long long directive and value. 682/// 683void AsmPrinter::EmitInt64(uint64_t Value) const { 684 OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/); 685} 686 687 688/// toOctal - Convert the low order bits of X into an octal digit. 689/// 690static inline char toOctal(int X) { 691 return (X&7)+'0'; 692} 693 694/// printStringChar - Print a char, escaped if necessary. 695/// 696static void printStringChar(formatted_raw_ostream &O, unsigned char C) { 697 if (C == '"') { 698 O << "\\\""; 699 } else if (C == '\\') { 700 O << "\\\\"; 701 } else if (isprint((unsigned char)C)) { 702 O << C; 703 } else { 704 switch(C) { 705 case '\b': O << "\\b"; break; 706 case '\f': O << "\\f"; break; 707 case '\n': O << "\\n"; break; 708 case '\r': O << "\\r"; break; 709 case '\t': O << "\\t"; break; 710 default: 711 O << '\\'; 712 O << toOctal(C >> 6); 713 O << toOctal(C >> 3); 714 O << toOctal(C >> 0); 715 break; 716 } 717 } 718} 719 720/// EmitFile - Emit a .file directive. 721void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const { 722 O << "\t.file\t" << Number << " \""; 723 for (unsigned i = 0, N = Name.size(); i < N; ++i) 724 printStringChar(O, Name[i]); 725 O << '\"'; 726} 727 728 729//===----------------------------------------------------------------------===// 730 731// EmitAlignment - Emit an alignment directive to the specified power of 732// two boundary. For example, if you pass in 3 here, you will get an 8 733// byte alignment. If a global value is specified, and if that global has 734// an explicit alignment requested, it will unconditionally override the 735// alignment request. However, if ForcedAlignBits is specified, this value 736// has final say: the ultimate alignment will be the max of ForcedAlignBits 737// and the alignment computed with NumBits and the global. 738// 739// The algorithm is: 740// Align = NumBits; 741// if (GV && GV->hasalignment) Align = GV->getalignment(); 742// Align = std::max(Align, ForcedAlignBits); 743// 744void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 745 unsigned ForcedAlignBits, 746 bool UseFillExpr) const { 747 if (GV && GV->getAlignment()) 748 NumBits = Log2_32(GV->getAlignment()); 749 NumBits = std::max(NumBits, ForcedAlignBits); 750 751 if (NumBits == 0) return; // No need to emit alignment. 752 753 unsigned FillValue = 0; 754 if (getCurrentSection()->getKind().isText()) 755 FillValue = MAI->getTextAlignFillValue(); 756 757 OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0); 758} 759 760/// LowerConstant - Lower the specified LLVM Constant to an MCExpr. 761/// 762static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) { 763 MCContext &Ctx = AP.OutContext; 764 765 if (CV->isNullValue() || isa<UndefValue>(CV)) 766 return MCConstantExpr::Create(0, Ctx); 767 768 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) 769 return MCConstantExpr::Create(CI->getZExtValue(), Ctx); 770 771 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) 772 return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx); 773 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) 774 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx); 775 776 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV); 777 if (CE == 0) { 778 llvm_unreachable("Unknown constant value to lower!"); 779 return MCConstantExpr::Create(0, Ctx); 780 } 781 782 switch (CE->getOpcode()) { 783 case Instruction::ZExt: 784 case Instruction::SExt: 785 case Instruction::FPTrunc: 786 case Instruction::FPExt: 787 case Instruction::UIToFP: 788 case Instruction::SIToFP: 789 case Instruction::FPToUI: 790 case Instruction::FPToSI: 791 default: llvm_unreachable("FIXME: Don't support this constant cast expr"); 792 case Instruction::GetElementPtr: { 793 const TargetData &TD = *AP.TM.getTargetData(); 794 // Generate a symbolic expression for the byte address 795 const Constant *PtrVal = CE->getOperand(0); 796 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end()); 797 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0], 798 IdxVec.size()); 799 800 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP); 801 if (Offset == 0) 802 return Base; 803 804 // Truncate/sext the offset to the pointer size. 805 if (TD.getPointerSizeInBits() != 64) { 806 int SExtAmount = 64-TD.getPointerSizeInBits(); 807 Offset = (Offset << SExtAmount) >> SExtAmount; 808 } 809 810 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx), 811 Ctx); 812 } 813 814 case Instruction::Trunc: 815 // We emit the value and depend on the assembler to truncate the generated 816 // expression properly. This is important for differences between 817 // blockaddress labels. Since the two labels are in the same function, it 818 // is reasonable to treat their delta as a 32-bit value. 819 // FALL THROUGH. 820 case Instruction::BitCast: 821 return LowerConstant(CE->getOperand(0), AP); 822 823 case Instruction::IntToPtr: { 824 const TargetData &TD = *AP.TM.getTargetData(); 825 // Handle casts to pointers by changing them into casts to the appropriate 826 // integer type. This promotes constant folding and simplifies this code. 827 Constant *Op = CE->getOperand(0); 828 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()), 829 false/*ZExt*/); 830 return LowerConstant(Op, AP); 831 } 832 833 case Instruction::PtrToInt: { 834 const TargetData &TD = *AP.TM.getTargetData(); 835 // Support only foldable casts to/from pointers that can be eliminated by 836 // changing the pointer to the appropriately sized integer type. 837 Constant *Op = CE->getOperand(0); 838 const Type *Ty = CE->getType(); 839 840 const MCExpr *OpExpr = LowerConstant(Op, AP); 841 842 // We can emit the pointer value into this slot if the slot is an 843 // integer slot equal to the size of the pointer. 844 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType())) 845 return OpExpr; 846 847 // Otherwise the pointer is smaller than the resultant integer, mask off 848 // the high bits so we are sure to get a proper truncation if the input is 849 // a constant expr. 850 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType()); 851 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx); 852 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx); 853 } 854 855 case Instruction::Add: 856 case Instruction::Sub: 857 case Instruction::And: 858 case Instruction::Or: 859 case Instruction::Xor: { 860 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP); 861 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP); 862 switch (CE->getOpcode()) { 863 default: llvm_unreachable("Unknown binary operator constant cast expr"); 864 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx); 865 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx); 866 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx); 867 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx); 868 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx); 869 } 870 } 871 } 872} 873 874static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace, 875 AsmPrinter &AP) { 876 if (AddrSpace != 0 || !CA->isString()) { 877 // Not a string. Print the values in successive locations 878 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 879 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace); 880 return; 881 } 882 883 // Otherwise, it can be emitted as .ascii. 884 SmallVector<char, 128> TmpVec; 885 TmpVec.reserve(CA->getNumOperands()); 886 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 887 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue()); 888 889 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace); 890} 891 892static void EmitGlobalConstantVector(const ConstantVector *CV, 893 unsigned AddrSpace, AsmPrinter &AP) { 894 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i) 895 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace); 896} 897 898static void EmitGlobalConstantStruct(const ConstantStruct *CS, 899 unsigned AddrSpace, AsmPrinter &AP) { 900 // Print the fields in successive locations. Pad to align if needed! 901 const TargetData *TD = AP.TM.getTargetData(); 902 unsigned Size = TD->getTypeAllocSize(CS->getType()); 903 const StructLayout *Layout = TD->getStructLayout(CS->getType()); 904 uint64_t SizeSoFar = 0; 905 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) { 906 const Constant *Field = CS->getOperand(i); 907 908 // Check if padding is needed and insert one or more 0s. 909 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType()); 910 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1)) 911 - Layout->getElementOffset(i)) - FieldSize; 912 SizeSoFar += FieldSize + PadSize; 913 914 // Now print the actual field value. 915 AP.EmitGlobalConstant(Field, AddrSpace); 916 917 // Insert padding - this may include padding to increase the size of the 918 // current field up to the ABI size (if the struct is not packed) as well 919 // as padding to ensure that the next field starts at the right offset. 920 AP.OutStreamer.EmitZeros(PadSize, AddrSpace); 921 } 922 assert(SizeSoFar == Layout->getSizeInBytes() && 923 "Layout of constant struct may be incorrect!"); 924} 925 926static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace, 927 AsmPrinter &AP) { 928 // FP Constants are printed as integer constants to avoid losing 929 // precision. 930 if (CFP->getType()->isDoubleTy()) { 931 if (AP.VerboseAsm) { 932 double Val = CFP->getValueAPF().convertToDouble(); 933 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n'; 934 } 935 936 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 937 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 938 return; 939 } 940 941 if (CFP->getType()->isFloatTy()) { 942 if (AP.VerboseAsm) { 943 float Val = CFP->getValueAPF().convertToFloat(); 944 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n'; 945 } 946 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 947 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace); 948 return; 949 } 950 951 if (CFP->getType()->isX86_FP80Ty()) { 952 // all long double variants are printed as hex 953 // api needed to prevent premature destruction 954 APInt API = CFP->getValueAPF().bitcastToAPInt(); 955 const uint64_t *p = API.getRawData(); 956 if (AP.VerboseAsm) { 957 // Convert to double so we can print the approximate val as a comment. 958 APFloat DoubleVal = CFP->getValueAPF(); 959 bool ignored; 960 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 961 &ignored); 962 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= " 963 << DoubleVal.convertToDouble() << '\n'; 964 } 965 966 if (AP.TM.getTargetData()->isBigEndian()) { 967 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 968 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 969 } else { 970 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 971 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 972 } 973 974 // Emit the tail padding for the long double. 975 const TargetData &TD = *AP.TM.getTargetData(); 976 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) - 977 TD.getTypeStoreSize(CFP->getType()), AddrSpace); 978 return; 979 } 980 981 assert(CFP->getType()->isPPC_FP128Ty() && 982 "Floating point constant type not handled"); 983 // All long double variants are printed as hex api needed to prevent 984 // premature destruction. 985 APInt API = CFP->getValueAPF().bitcastToAPInt(); 986 const uint64_t *p = API.getRawData(); 987 if (AP.TM.getTargetData()->isBigEndian()) { 988 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 989 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 990 } else { 991 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 992 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 993 } 994} 995 996static void EmitGlobalConstantLargeInt(const ConstantInt *CI, 997 unsigned AddrSpace, AsmPrinter &AP) { 998 const TargetData *TD = AP.TM.getTargetData(); 999 unsigned BitWidth = CI->getBitWidth(); 1000 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits"); 1001 1002 // We don't expect assemblers to support integer data directives 1003 // for more than 64 bits, so we emit the data in at most 64-bit 1004 // quantities at a time. 1005 const uint64_t *RawData = CI->getValue().getRawData(); 1006 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1007 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i]; 1008 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 1009 } 1010} 1011 1012/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 1013void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { 1014 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) { 1015 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1016 return OutStreamer.EmitZeros(Size, AddrSpace); 1017 } 1018 1019 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1020 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1021 switch (Size) { 1022 case 1: 1023 case 2: 1024 case 4: 1025 case 8: 1026 if (VerboseAsm) 1027 OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue()); 1028 OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace); 1029 return; 1030 default: 1031 EmitGlobalConstantLargeInt(CI, AddrSpace, *this); 1032 return; 1033 } 1034 } 1035 1036 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) 1037 return EmitGlobalConstantArray(CVA, AddrSpace, *this); 1038 1039 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) 1040 return EmitGlobalConstantStruct(CVS, AddrSpace, *this); 1041 1042 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) 1043 return EmitGlobalConstantFP(CFP, AddrSpace, *this); 1044 1045 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV)) 1046 return EmitGlobalConstantVector(V, AddrSpace, *this); 1047 1048 if (isa<ConstantPointerNull>(CV)) { 1049 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1050 OutStreamer.EmitIntValue(0, Size, AddrSpace); 1051 return; 1052 } 1053 1054 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it 1055 // thread the streamer with EmitValue. 1056 OutStreamer.EmitValue(LowerConstant(CV, *this), 1057 TM.getTargetData()->getTypeAllocSize(CV->getType()), 1058 AddrSpace); 1059} 1060 1061void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1062 // Target doesn't support this yet! 1063 llvm_unreachable("Target does not support EmitMachineConstantPoolValue"); 1064} 1065 1066/// PrintSpecial - Print information related to the specified machine instr 1067/// that is independent of the operand, and may be independent of the instr 1068/// itself. This can be useful for portably encoding the comment character 1069/// or other bits of target-specific knowledge into the asmstrings. The 1070/// syntax used is ${:comment}. Targets can override this to add support 1071/// for their own strange codes. 1072void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const { 1073 if (!strcmp(Code, "private")) { 1074 O << MAI->getPrivateGlobalPrefix(); 1075 } else if (!strcmp(Code, "comment")) { 1076 if (VerboseAsm) 1077 O << MAI->getCommentString(); 1078 } else if (!strcmp(Code, "uid")) { 1079 // Comparing the address of MI isn't sufficient, because machineinstrs may 1080 // be allocated to the same address across functions. 1081 const Function *ThisF = MI->getParent()->getParent()->getFunction(); 1082 1083 // If this is a new LastFn instruction, bump the counter. 1084 if (LastMI != MI || LastFn != ThisF) { 1085 ++Counter; 1086 LastMI = MI; 1087 LastFn = ThisF; 1088 } 1089 O << Counter; 1090 } else { 1091 std::string msg; 1092 raw_string_ostream Msg(msg); 1093 Msg << "Unknown special formatter '" << Code 1094 << "' for machine instr: " << *MI; 1095 llvm_report_error(Msg.str()); 1096 } 1097} 1098 1099/// processDebugLoc - Processes the debug information of each machine 1100/// instruction's DebugLoc. 1101void AsmPrinter::processDebugLoc(const MachineInstr *MI, 1102 bool BeforePrintingInsn) { 1103 if (!MAI || !DW || !MAI->doesSupportDebugInformation() 1104 || !DW->ShouldEmitDwarfDebug()) 1105 return; 1106 DebugLoc DL = MI->getDebugLoc(); 1107 if (DL.isUnknown()) 1108 return; 1109 DILocation CurDLT = MF->getDILocation(DL); 1110 if (CurDLT.getScope().isNull()) 1111 return; 1112 1113 if (!BeforePrintingInsn) { 1114 // After printing instruction 1115 DW->EndScope(MI); 1116 } else if (CurDLT.getNode() != PrevDLT) { 1117 unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(), 1118 CurDLT.getColumnNumber(), 1119 CurDLT.getScope().getNode()); 1120 printLabel(L); 1121 O << '\n'; 1122 DW->BeginScope(MI, L); 1123 PrevDLT = CurDLT.getNode(); 1124 } 1125} 1126 1127 1128/// printInlineAsm - This method formats and prints the specified machine 1129/// instruction that is an inline asm. 1130void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { 1131 unsigned NumOperands = MI->getNumOperands(); 1132 1133 // Count the number of register definitions. 1134 unsigned NumDefs = 0; 1135 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef(); 1136 ++NumDefs) 1137 assert(NumDefs != NumOperands-1 && "No asm string?"); 1138 1139 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?"); 1140 1141 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. 1142 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); 1143 1144 O << '\t'; 1145 1146 // If this asmstr is empty, just print the #APP/#NOAPP markers. 1147 // These are useful to see where empty asm's wound up. 1148 if (AsmStr[0] == 0) { 1149 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1150 O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n'; 1151 return; 1152 } 1153 1154 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1155 1156 // The variant of the current asmprinter. 1157 int AsmPrinterVariant = MAI->getAssemblerDialect(); 1158 1159 int CurVariant = -1; // The number of the {.|.|.} region we are in. 1160 const char *LastEmitted = AsmStr; // One past the last character emitted. 1161 1162 while (*LastEmitted) { 1163 switch (*LastEmitted) { 1164 default: { 1165 // Not a special case, emit the string section literally. 1166 const char *LiteralEnd = LastEmitted+1; 1167 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && 1168 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') 1169 ++LiteralEnd; 1170 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1171 O.write(LastEmitted, LiteralEnd-LastEmitted); 1172 LastEmitted = LiteralEnd; 1173 break; 1174 } 1175 case '\n': 1176 ++LastEmitted; // Consume newline character. 1177 O << '\n'; // Indent code with newline. 1178 break; 1179 case '$': { 1180 ++LastEmitted; // Consume '$' character. 1181 bool Done = true; 1182 1183 // Handle escapes. 1184 switch (*LastEmitted) { 1185 default: Done = false; break; 1186 case '$': // $$ -> $ 1187 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1188 O << '$'; 1189 ++LastEmitted; // Consume second '$' character. 1190 break; 1191 case '(': // $( -> same as GCC's { character. 1192 ++LastEmitted; // Consume '(' character. 1193 if (CurVariant != -1) { 1194 llvm_report_error("Nested variants found in inline asm string: '" 1195 + std::string(AsmStr) + "'"); 1196 } 1197 CurVariant = 0; // We're in the first variant now. 1198 break; 1199 case '|': 1200 ++LastEmitted; // consume '|' character. 1201 if (CurVariant == -1) 1202 O << '|'; // this is gcc's behavior for | outside a variant 1203 else 1204 ++CurVariant; // We're in the next variant. 1205 break; 1206 case ')': // $) -> same as GCC's } char. 1207 ++LastEmitted; // consume ')' character. 1208 if (CurVariant == -1) 1209 O << '}'; // this is gcc's behavior for } outside a variant 1210 else 1211 CurVariant = -1; 1212 break; 1213 } 1214 if (Done) break; 1215 1216 bool HasCurlyBraces = false; 1217 if (*LastEmitted == '{') { // ${variable} 1218 ++LastEmitted; // Consume '{' character. 1219 HasCurlyBraces = true; 1220 } 1221 1222 // If we have ${:foo}, then this is not a real operand reference, it is a 1223 // "magic" string reference, just like in .td files. Arrange to call 1224 // PrintSpecial. 1225 if (HasCurlyBraces && *LastEmitted == ':') { 1226 ++LastEmitted; 1227 const char *StrStart = LastEmitted; 1228 const char *StrEnd = strchr(StrStart, '}'); 1229 if (StrEnd == 0) { 1230 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '" 1231 + std::string(AsmStr) + "'"); 1232 } 1233 1234 std::string Val(StrStart, StrEnd); 1235 PrintSpecial(MI, Val.c_str()); 1236 LastEmitted = StrEnd+1; 1237 break; 1238 } 1239 1240 const char *IDStart = LastEmitted; 1241 char *IDEnd; 1242 errno = 0; 1243 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. 1244 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { 1245 llvm_report_error("Bad $ operand number in inline asm string: '" 1246 + std::string(AsmStr) + "'"); 1247 } 1248 LastEmitted = IDEnd; 1249 1250 char Modifier[2] = { 0, 0 }; 1251 1252 if (HasCurlyBraces) { 1253 // If we have curly braces, check for a modifier character. This 1254 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. 1255 if (*LastEmitted == ':') { 1256 ++LastEmitted; // Consume ':' character. 1257 if (*LastEmitted == 0) { 1258 llvm_report_error("Bad ${:} expression in inline asm string: '" 1259 + std::string(AsmStr) + "'"); 1260 } 1261 1262 Modifier[0] = *LastEmitted; 1263 ++LastEmitted; // Consume modifier character. 1264 } 1265 1266 if (*LastEmitted != '}') { 1267 llvm_report_error("Bad ${} expression in inline asm string: '" 1268 + std::string(AsmStr) + "'"); 1269 } 1270 ++LastEmitted; // Consume '}' character. 1271 } 1272 1273 if ((unsigned)Val >= NumOperands-1) { 1274 llvm_report_error("Invalid $ operand number in inline asm string: '" 1275 + std::string(AsmStr) + "'"); 1276 } 1277 1278 // Okay, we finally have a value number. Ask the target to print this 1279 // operand! 1280 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { 1281 unsigned OpNo = 1; 1282 1283 bool Error = false; 1284 1285 // Scan to find the machine operand number for the operand. 1286 for (; Val; --Val) { 1287 if (OpNo >= MI->getNumOperands()) break; 1288 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1289 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1; 1290 } 1291 1292 if (OpNo >= MI->getNumOperands()) { 1293 Error = true; 1294 } else { 1295 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1296 ++OpNo; // Skip over the ID number. 1297 1298 if (Modifier[0] == 'l') // labels are target independent 1299 O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber()); 1300 else { 1301 AsmPrinter *AP = const_cast<AsmPrinter*>(this); 1302 if ((OpFlags & 7) == 4) { 1303 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, 1304 Modifier[0] ? Modifier : 0); 1305 } else { 1306 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, 1307 Modifier[0] ? Modifier : 0); 1308 } 1309 } 1310 } 1311 if (Error) { 1312 std::string msg; 1313 raw_string_ostream Msg(msg); 1314 Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n"; 1315 MI->print(Msg); 1316 llvm_report_error(Msg.str()); 1317 } 1318 } 1319 break; 1320 } 1321 } 1322 } 1323 O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd(); 1324} 1325 1326/// printImplicitDef - This method prints the specified machine instruction 1327/// that is an implicit def. 1328void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { 1329 if (!VerboseAsm) return; 1330 O.PadToColumn(MAI->getCommentColumn()); 1331 O << MAI->getCommentString() << " implicit-def: " 1332 << TRI->getName(MI->getOperand(0).getReg()); 1333} 1334 1335void AsmPrinter::printKill(const MachineInstr *MI) const { 1336 if (!VerboseAsm) return; 1337 O.PadToColumn(MAI->getCommentColumn()); 1338 O << MAI->getCommentString() << " kill:"; 1339 for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) { 1340 const MachineOperand &op = MI->getOperand(n); 1341 assert(op.isReg() && "KILL instruction must have only register operands"); 1342 O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>"); 1343 } 1344} 1345 1346/// printLabel - This method prints a local label used by debug and 1347/// exception handling tables. 1348void AsmPrinter::printLabel(const MachineInstr *MI) const { 1349 printLabel(MI->getOperand(0).getImm()); 1350} 1351 1352void AsmPrinter::printLabel(unsigned Id) const { 1353 O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':'; 1354} 1355 1356/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 1357/// instruction, using the specified assembler variant. Targets should 1358/// override this to format as appropriate. 1359bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 1360 unsigned AsmVariant, const char *ExtraCode) { 1361 // Target doesn't support this yet! 1362 return true; 1363} 1364 1365bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 1366 unsigned AsmVariant, 1367 const char *ExtraCode) { 1368 // Target doesn't support this yet! 1369 return true; 1370} 1371 1372MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA, 1373 const char *Suffix) const { 1374 return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix); 1375} 1376 1377MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F, 1378 const BasicBlock *BB, 1379 const char *Suffix) const { 1380 assert(BB->hasName() && 1381 "Address of anonymous basic block not supported yet!"); 1382 1383 // This code must use the function name itself, and not the function number, 1384 // since it must be possible to generate the label name from within other 1385 // functions. 1386 SmallString<60> FnName; 1387 Mang->getNameWithPrefix(FnName, F, false); 1388 1389 // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME! 1390 SmallString<60> NameResult; 1391 Mang->getNameWithPrefix(NameResult, 1392 StringRef("BA") + Twine((unsigned)FnName.size()) + 1393 "_" + FnName.str() + "_" + BB->getName() + Suffix, 1394 Mangler::Private); 1395 1396 return OutContext.GetOrCreateSymbol(NameResult.str()); 1397} 1398 1399MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const { 1400 SmallString<60> Name; 1401 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB" 1402 << getFunctionNumber() << '_' << MBBID; 1403 return OutContext.GetOrCreateSymbol(Name.str()); 1404} 1405 1406/// GetCPISymbol - Return the symbol for the specified constant pool entry. 1407MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const { 1408 SmallString<60> Name; 1409 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI" 1410 << getFunctionNumber() << '_' << CPID; 1411 return OutContext.GetOrCreateSymbol(Name.str()); 1412} 1413 1414/// GetJTISymbol - Return the symbol for the specified jump table entry. 1415MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const { 1416 const char *Prefix = isLinkerPrivate ? MAI->getLinkerPrivateGlobalPrefix() : 1417 MAI->getPrivateGlobalPrefix(); 1418 SmallString<60> Name; 1419 raw_svector_ostream(Name) << Prefix << "JTI" << getFunctionNumber() << '_' 1420 << JTID; 1421 return OutContext.GetOrCreateSymbol(Name.str()); 1422} 1423 1424/// GetGlobalValueSymbol - Return the MCSymbol for the specified global 1425/// value. 1426MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const { 1427 SmallString<60> NameStr; 1428 Mang->getNameWithPrefix(NameStr, GV, false); 1429 return OutContext.GetOrCreateSymbol(NameStr.str()); 1430} 1431 1432/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with 1433/// global value name as its base, with the specified suffix, and where the 1434/// symbol is forced to have private linkage if ForcePrivate is true. 1435MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV, 1436 StringRef Suffix, 1437 bool ForcePrivate) const { 1438 SmallString<60> NameStr; 1439 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate); 1440 NameStr.append(Suffix.begin(), Suffix.end()); 1441 return OutContext.GetOrCreateSymbol(NameStr.str()); 1442} 1443 1444/// GetExternalSymbolSymbol - Return the MCSymbol for the specified 1445/// ExternalSymbol. 1446MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const { 1447 SmallString<60> NameStr; 1448 Mang->getNameWithPrefix(NameStr, Sym); 1449 return OutContext.GetOrCreateSymbol(NameStr.str()); 1450} 1451 1452 1453 1454/// PrintParentLoopComment - Print comments about parent loops of this one. 1455static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1456 unsigned FunctionNumber) { 1457 if (Loop == 0) return; 1458 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber); 1459 OS.indent(Loop->getLoopDepth()*2) 1460 << "Parent Loop BB" << FunctionNumber << "_" 1461 << Loop->getHeader()->getNumber() 1462 << " Depth=" << Loop->getLoopDepth() << '\n'; 1463} 1464 1465 1466/// PrintChildLoopComment - Print comments about child loops within 1467/// the loop for this basic block, with nesting. 1468static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1469 unsigned FunctionNumber) { 1470 // Add child loop information 1471 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){ 1472 OS.indent((*CL)->getLoopDepth()*2) 1473 << "Child Loop BB" << FunctionNumber << "_" 1474 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth() 1475 << '\n'; 1476 PrintChildLoopComment(OS, *CL, FunctionNumber); 1477 } 1478} 1479 1480/// EmitComments - Pretty-print comments for basic blocks. 1481static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB, 1482 const MachineLoopInfo *LI, 1483 const AsmPrinter &AP) { 1484 // Add loop depth information 1485 const MachineLoop *Loop = LI->getLoopFor(&MBB); 1486 if (Loop == 0) return; 1487 1488 MachineBasicBlock *Header = Loop->getHeader(); 1489 assert(Header && "No header for loop"); 1490 1491 // If this block is not a loop header, just print out what is the loop header 1492 // and return. 1493 if (Header != &MBB) { 1494 AP.OutStreamer.AddComment(" in Loop: Header=BB" + 1495 Twine(AP.getFunctionNumber())+"_" + 1496 Twine(Loop->getHeader()->getNumber())+ 1497 " Depth="+Twine(Loop->getLoopDepth())); 1498 return; 1499 } 1500 1501 // Otherwise, it is a loop header. Print out information about child and 1502 // parent loops. 1503 raw_ostream &OS = AP.OutStreamer.GetCommentOS(); 1504 1505 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber()); 1506 1507 OS << "=>"; 1508 OS.indent(Loop->getLoopDepth()*2-2); 1509 1510 OS << "This "; 1511 if (Loop->empty()) 1512 OS << "Inner "; 1513 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n'; 1514 1515 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber()); 1516} 1517 1518 1519/// EmitBasicBlockStart - This method prints the label for the specified 1520/// MachineBasicBlock, an alignment (if present) and a comment describing 1521/// it if appropriate. 1522void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { 1523 // Emit an alignment directive for this block, if needed. 1524 if (unsigned Align = MBB->getAlignment()) 1525 EmitAlignment(Log2_32(Align)); 1526 1527 // If the block has its address taken, emit a special label to satisfy 1528 // references to the block. This is done so that we don't need to 1529 // remember the number of this label, and so that we can make 1530 // forward references to labels without knowing what their numbers 1531 // will be. 1532 if (MBB->hasAddressTaken()) { 1533 const BasicBlock *BB = MBB->getBasicBlock(); 1534 if (VerboseAsm) 1535 OutStreamer.AddComment("Address Taken"); 1536 OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB)); 1537 } 1538 1539 // Print the main label for the block. 1540 if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) { 1541 if (VerboseAsm) { 1542 // NOTE: Want this comment at start of line. 1543 O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':'; 1544 if (const BasicBlock *BB = MBB->getBasicBlock()) 1545 if (BB->hasName()) 1546 OutStreamer.AddComment("%" + BB->getName()); 1547 1548 PrintBasicBlockLoopComments(*MBB, LI, *this); 1549 OutStreamer.AddBlankLine(); 1550 } 1551 } else { 1552 if (VerboseAsm) { 1553 if (const BasicBlock *BB = MBB->getBasicBlock()) 1554 if (BB->hasName()) 1555 OutStreamer.AddComment("%" + BB->getName()); 1556 PrintBasicBlockLoopComments(*MBB, LI, *this); 1557 } 1558 1559 OutStreamer.EmitLabel(GetMBBSymbol(MBB->getNumber())); 1560 } 1561} 1562 1563/// printPICJumpTableSetLabel - This method prints a set label for the 1564/// specified MachineBasicBlock for a jumptable entry. 1565void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, 1566 const MachineBasicBlock *MBB) const { 1567 if (!MAI->getSetDirective()) 1568 return; 1569 1570 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix() 1571 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',' 1572 << *GetMBBSymbol(MBB->getNumber()) 1573 << '-' << *GetJTISymbol(uid) << '\n'; 1574} 1575 1576void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2, 1577 const MachineBasicBlock *MBB) const { 1578 if (!MAI->getSetDirective()) 1579 return; 1580 1581 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix() 1582 << getFunctionNumber() << '_' << uid << '_' << uid2 1583 << "_set_" << MBB->getNumber() << ',' 1584 << *GetMBBSymbol(MBB->getNumber()) 1585 << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1586 << '_' << uid << '_' << uid2 << '\n'; 1587} 1588 1589void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const { 1590 MCSymbolAttr Attr = MCSA_Invalid; 1591 1592 switch (Visibility) { 1593 default: break; 1594 case GlobalValue::HiddenVisibility: 1595 Attr = MAI->getHiddenVisibilityAttr(); 1596 break; 1597 case GlobalValue::ProtectedVisibility: 1598 Attr = MAI->getProtectedVisibilityAttr(); 1599 break; 1600 } 1601 1602 if (Attr != MCSA_Invalid) 1603 OutStreamer.EmitSymbolAttribute(Sym, Attr); 1604} 1605 1606void AsmPrinter::printOffset(int64_t Offset) const { 1607 if (Offset > 0) 1608 O << '+' << Offset; 1609 else if (Offset < 0) 1610 O << Offset; 1611} 1612 1613GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1614 if (!S->usesMetadata()) 1615 return 0; 1616 1617 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1618 if (GCPI != GCMetadataPrinters.end()) 1619 return GCPI->second; 1620 1621 const char *Name = S->getName().c_str(); 1622 1623 for (GCMetadataPrinterRegistry::iterator 1624 I = GCMetadataPrinterRegistry::begin(), 1625 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1626 if (strcmp(Name, I->getName()) == 0) { 1627 GCMetadataPrinter *GMP = I->instantiate(); 1628 GMP->S = S; 1629 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1630 return GMP; 1631 } 1632 1633 llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name)); 1634 return 0; 1635} 1636 1637/// EmitComments - Pretty-print comments for instructions 1638void AsmPrinter::EmitComments(const MachineInstr &MI) const { 1639 if (!VerboseAsm) 1640 return; 1641 1642 bool Newline = false; 1643 1644 if (!MI.getDebugLoc().isUnknown()) { 1645 DILocation DLT = MF->getDILocation(MI.getDebugLoc()); 1646 1647 // Print source line info. 1648 O.PadToColumn(MAI->getCommentColumn()); 1649 O << MAI->getCommentString() << ' '; 1650 DIScope Scope = DLT.getScope(); 1651 // Omit the directory, because it's likely to be long and uninteresting. 1652 if (!Scope.isNull()) 1653 O << Scope.getFilename(); 1654 else 1655 O << "<unknown>"; 1656 O << ':' << DLT.getLineNumber(); 1657 if (DLT.getColumnNumber() != 0) 1658 O << ':' << DLT.getColumnNumber(); 1659 Newline = true; 1660 } 1661 1662 // Check for spills and reloads 1663 int FI; 1664 1665 const MachineFrameInfo *FrameInfo = 1666 MI.getParent()->getParent()->getFrameInfo(); 1667 1668 // We assume a single instruction only has a spill or reload, not 1669 // both. 1670 const MachineMemOperand *MMO; 1671 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) { 1672 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1673 MMO = *MI.memoperands_begin(); 1674 if (Newline) O << '\n'; 1675 O.PadToColumn(MAI->getCommentColumn()); 1676 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload"; 1677 Newline = true; 1678 } 1679 } 1680 else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) { 1681 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1682 if (Newline) O << '\n'; 1683 O.PadToColumn(MAI->getCommentColumn()); 1684 O << MAI->getCommentString() << ' ' 1685 << MMO->getSize() << "-byte Folded Reload"; 1686 Newline = true; 1687 } 1688 } 1689 else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) { 1690 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1691 MMO = *MI.memoperands_begin(); 1692 if (Newline) O << '\n'; 1693 O.PadToColumn(MAI->getCommentColumn()); 1694 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill"; 1695 Newline = true; 1696 } 1697 } 1698 else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) { 1699 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1700 if (Newline) O << '\n'; 1701 O.PadToColumn(MAI->getCommentColumn()); 1702 O << MAI->getCommentString() << ' ' 1703 << MMO->getSize() << "-byte Folded Spill"; 1704 Newline = true; 1705 } 1706 } 1707 1708 // Check for spill-induced copies 1709 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx; 1710 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg, 1711 SrcSubIdx, DstSubIdx)) { 1712 if (MI.getAsmPrinterFlag(ReloadReuse)) { 1713 if (Newline) O << '\n'; 1714 O.PadToColumn(MAI->getCommentColumn()); 1715 O << MAI->getCommentString() << " Reload Reuse"; 1716 } 1717 } 1718} 1719 1720