AsmPrinter.cpp revision 111a3193b5e25f8765221f2e94fba888155fe4eb
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), 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 90/// getFunctionNumber - Return a unique ID for the current function. 91/// 92unsigned AsmPrinter::getFunctionNumber() const { 93 return MF->getFunctionNumber(); 94} 95 96TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const { 97 return TM.getTargetLowering()->getObjFileLowering(); 98} 99 100/// getCurrentSection() - Return the current section we are emitting to. 101const MCSection *AsmPrinter::getCurrentSection() const { 102 return OutStreamer.getCurrentSection(); 103} 104 105 106void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { 107 AU.setPreservesAll(); 108 MachineFunctionPass::getAnalysisUsage(AU); 109 AU.addRequired<GCModuleInfo>(); 110 if (VerboseAsm) 111 AU.addRequired<MachineLoopInfo>(); 112} 113 114bool AsmPrinter::doInitialization(Module &M) { 115 // Initialize TargetLoweringObjectFile. 116 const_cast<TargetLoweringObjectFile&>(getObjFileLowering()) 117 .Initialize(OutContext, TM); 118 119 Mang = new Mangler(*MAI); 120 121 // Allow the target to emit any magic that it wants at the start of the file. 122 EmitStartOfAsmFile(M); 123 124 // Very minimal debug info. It is ignored if we emit actual debug info. If we 125 // don't, this at least helps the user find where a global came from. 126 if (MAI->hasSingleParameterDotFile()) { 127 // .file "foo.c" 128 OutStreamer.EmitFileDirective(M.getModuleIdentifier()); 129 } 130 131 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 132 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 133 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 134 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 135 MP->beginAssembly(O, *this, *MAI); 136 137 if (!M.getModuleInlineAsm().empty()) 138 O << MAI->getCommentString() << " Start of file scope inline assembly\n" 139 << M.getModuleInlineAsm() 140 << '\n' << MAI->getCommentString() 141 << " End of file scope inline assembly\n"; 142 143 MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 144 if (MMI) 145 MMI->AnalyzeModule(M); 146 DW = getAnalysisIfAvailable<DwarfWriter>(); 147 if (DW) 148 DW->BeginModule(&M, MMI, O, this, MAI); 149 150 return false; 151} 152 153void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) { 154 switch ((GlobalValue::LinkageTypes)Linkage) { 155 case GlobalValue::CommonLinkage: 156 case GlobalValue::LinkOnceAnyLinkage: 157 case GlobalValue::LinkOnceODRLinkage: 158 case GlobalValue::WeakAnyLinkage: 159 case GlobalValue::WeakODRLinkage: 160 case GlobalValue::LinkerPrivateLinkage: 161 if (MAI->getWeakDefDirective() != 0) { 162 // .globl _foo 163 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 164 // .weak_definition _foo 165 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition); 166 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) { 167 // .globl _foo 168 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 169 // FIXME: linkonce should be a section attribute, handled by COFF Section 170 // assignment. 171 // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce 172 // .linkonce discard 173 // FIXME: It would be nice to use .linkonce samesize for non-common 174 // globals. 175 O << LinkOnce; 176 } else { 177 // .weak _foo 178 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak); 179 } 180 break; 181 case GlobalValue::DLLExportLinkage: 182 case GlobalValue::AppendingLinkage: 183 // FIXME: appending linkage variables should go into a section of 184 // their name or something. For now, just emit them as external. 185 case GlobalValue::ExternalLinkage: 186 // If external or appending, declare as a global symbol. 187 // .globl _foo 188 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 189 break; 190 case GlobalValue::PrivateLinkage: 191 case GlobalValue::InternalLinkage: 192 break; 193 default: 194 llvm_unreachable("Unknown linkage type!"); 195 } 196} 197 198 199/// EmitGlobalVariable - Emit the specified global variable to the .s file. 200void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { 201 if (!GV->hasInitializer()) // External globals require no code. 202 return; 203 204 // Check to see if this is a special global used by LLVM, if so, emit it. 205 if (EmitSpecialLLVMGlobal(GV)) 206 return; 207 208 MCSymbol *GVSym = GetGlobalValueSymbol(GV); 209 printVisibility(GVSym, GV->getVisibility()); 210 211 if (MAI->hasDotTypeDotSizeDirective()) 212 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject); 213 214 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM); 215 216 const TargetData *TD = TM.getTargetData(); 217 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType()); 218 unsigned AlignLog = TD->getPreferredAlignmentLog(GV); 219 220 // Handle common and BSS local symbols (.lcomm). 221 if (GVKind.isCommon() || GVKind.isBSSLocal()) { 222 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 223 224 if (VerboseAsm) { 225 WriteAsOperand(OutStreamer.GetCommentOS(), GV, 226 /*PrintType=*/false, GV->getParent()); 227 OutStreamer.GetCommentOS() << '\n'; 228 } 229 230 // Handle common symbols. 231 if (GVKind.isCommon()) { 232 // .comm _foo, 42, 4 233 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 234 return; 235 } 236 237 // Handle local BSS symbols. 238 if (MAI->hasMachoZeroFillDirective()) { 239 const MCSection *TheSection = 240 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 241 // .zerofill __DATA, __bss, _foo, 400, 5 242 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 243 return; 244 } 245 246 if (MAI->hasLCOMMDirective()) { 247 // .lcomm _foo, 42 248 OutStreamer.EmitLocalCommonSymbol(GVSym, Size); 249 return; 250 } 251 252 // .local _foo 253 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local); 254 // .comm _foo, 42, 4 255 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 256 return; 257 } 258 259 const MCSection *TheSection = 260 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 261 262 // Handle the zerofill directive on darwin, which is a special form of BSS 263 // emission. 264 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) { 265 // .globl _foo 266 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global); 267 // .zerofill __DATA, __common, _foo, 400, 5 268 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 269 return; 270 } 271 272 OutStreamer.SwitchSection(TheSection); 273 274 EmitLinkage(GV->getLinkage(), GVSym); 275 EmitAlignment(AlignLog, GV); 276 277 if (VerboseAsm) { 278 WriteAsOperand(OutStreamer.GetCommentOS(), GV, 279 /*PrintType=*/false, GV->getParent()); 280 OutStreamer.GetCommentOS() << '\n'; 281 } 282 OutStreamer.EmitLabel(GVSym); 283 284 EmitGlobalConstant(GV->getInitializer()); 285 286 if (MAI->hasDotTypeDotSizeDirective()) 287 // .size foo, 42 288 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext)); 289 290 OutStreamer.AddBlankLine(); 291} 292 293/// EmitFunctionHeader - This method emits the header for the current 294/// function. 295void AsmPrinter::EmitFunctionHeader() { 296 // Print out constants referenced by the function 297 EmitConstantPool(MF->getConstantPool()); 298 299 // Print the 'header' of function. 300 const Function *F = MF->getFunction(); 301 302 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM)); 303 printVisibility(CurrentFnSym, F->getVisibility()); 304 305 EmitLinkage(F->getLinkage(), CurrentFnSym); 306 EmitAlignment(MF->getAlignment(), F); 307 308 if (MAI->hasDotTypeDotSizeDirective()) 309 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction); 310 311 O << *CurrentFnSym << ':'; 312 if (VerboseAsm) { 313 O.PadToColumn(MAI->getCommentColumn()); 314 O << MAI->getCommentString() << ' '; 315 WriteAsOperand(O, F, /*PrintType=*/false, F->getParent()); 316 } 317 O << '\n'; 318 319 // Add some workaround for linkonce linkage on Cygwin\MinGW. 320 if (MAI->getLinkOnceDirective() != 0 && 321 (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) 322 O << "Lllvm$workaround$fake$stub$" << *CurrentFnSym << ":\n"; 323 324 // Emit pre-function debug and/or EH information. 325 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling()) 326 DW->BeginFunction(MF); 327} 328 329 330 331 332bool AsmPrinter::doFinalization(Module &M) { 333 // Emit global variables. 334 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 335 I != E; ++I) 336 EmitGlobalVariable(I); 337 338 // Emit final debug information. 339 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling()) 340 DW->EndModule(); 341 342 // If the target wants to know about weak references, print them all. 343 if (MAI->getWeakRefDirective()) { 344 // FIXME: This is not lazy, it would be nice to only print weak references 345 // to stuff that is actually used. Note that doing so would require targets 346 // to notice uses in operands (due to constant exprs etc). This should 347 // happen with the MC stuff eventually. 348 349 // Print out module-level global variables here. 350 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 351 I != E; ++I) { 352 if (!I->hasExternalWeakLinkage()) continue; 353 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I), 354 MCSA_WeakReference); 355 } 356 357 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) { 358 if (!I->hasExternalWeakLinkage()) continue; 359 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I), 360 MCSA_WeakReference); 361 } 362 } 363 364 if (MAI->hasSetDirective()) { 365 OutStreamer.AddBlankLine(); 366 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 367 I != E; ++I) { 368 MCSymbol *Name = GetGlobalValueSymbol(I); 369 370 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 371 MCSymbol *Target = GetGlobalValueSymbol(GV); 372 373 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective()) 374 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global); 375 else if (I->hasWeakLinkage()) 376 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference); 377 else 378 assert(I->hasLocalLinkage() && "Invalid alias linkage"); 379 380 printVisibility(Name, I->getVisibility()); 381 382 // Emit the directives as assignments aka .set: 383 OutStreamer.EmitAssignment(Name, 384 MCSymbolRefExpr::Create(Target, OutContext)); 385 } 386 } 387 388 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 389 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 390 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 391 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 392 MP->finishAssembly(O, *this, *MAI); 393 394 // If we don't have any trampolines, then we don't require stack memory 395 // to be executable. Some targets have a directive to declare this. 396 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 397 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 398 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext)) 399 OutStreamer.SwitchSection(S); 400 401 // Allow the target to emit any magic that it wants at the end of the file, 402 // after everything else has gone out. 403 EmitEndOfAsmFile(M); 404 405 delete Mang; Mang = 0; 406 DW = 0; MMI = 0; 407 408 OutStreamer.Finish(); 409 return false; 410} 411 412void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 413 this->MF = &MF; 414 // Get the function symbol. 415 CurrentFnSym = GetGlobalValueSymbol(MF.getFunction()); 416 417 if (VerboseAsm) 418 LI = &getAnalysis<MachineLoopInfo>(); 419} 420 421namespace { 422 // SectionCPs - Keep track the alignment, constpool entries per Section. 423 struct SectionCPs { 424 const MCSection *S; 425 unsigned Alignment; 426 SmallVector<unsigned, 4> CPEs; 427 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {} 428 }; 429} 430 431/// EmitConstantPool - Print to the current output stream assembly 432/// representations of the constants in the constant pool MCP. This is 433/// used to print out constants which have been "spilled to memory" by 434/// the code generator. 435/// 436void AsmPrinter::EmitConstantPool(const MachineConstantPool *MCP) { 437 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 438 if (CP.empty()) return; 439 440 // Calculate sections for constant pool entries. We collect entries to go into 441 // the same section together to reduce amount of section switch statements. 442 SmallVector<SectionCPs, 4> CPSections; 443 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 444 const MachineConstantPoolEntry &CPE = CP[i]; 445 unsigned Align = CPE.getAlignment(); 446 447 SectionKind Kind; 448 switch (CPE.getRelocationInfo()) { 449 default: llvm_unreachable("Unknown section kind"); 450 case 2: Kind = SectionKind::getReadOnlyWithRel(); break; 451 case 1: 452 Kind = SectionKind::getReadOnlyWithRelLocal(); 453 break; 454 case 0: 455 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) { 456 case 4: Kind = SectionKind::getMergeableConst4(); break; 457 case 8: Kind = SectionKind::getMergeableConst8(); break; 458 case 16: Kind = SectionKind::getMergeableConst16();break; 459 default: Kind = SectionKind::getMergeableConst(); break; 460 } 461 } 462 463 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind); 464 465 // The number of sections are small, just do a linear search from the 466 // last section to the first. 467 bool Found = false; 468 unsigned SecIdx = CPSections.size(); 469 while (SecIdx != 0) { 470 if (CPSections[--SecIdx].S == S) { 471 Found = true; 472 break; 473 } 474 } 475 if (!Found) { 476 SecIdx = CPSections.size(); 477 CPSections.push_back(SectionCPs(S, Align)); 478 } 479 480 if (Align > CPSections[SecIdx].Alignment) 481 CPSections[SecIdx].Alignment = Align; 482 CPSections[SecIdx].CPEs.push_back(i); 483 } 484 485 // Now print stuff into the calculated sections. 486 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) { 487 OutStreamer.SwitchSection(CPSections[i].S); 488 EmitAlignment(Log2_32(CPSections[i].Alignment)); 489 490 unsigned Offset = 0; 491 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) { 492 unsigned CPI = CPSections[i].CPEs[j]; 493 MachineConstantPoolEntry CPE = CP[CPI]; 494 495 // Emit inter-object padding for alignment. 496 unsigned AlignMask = CPE.getAlignment() - 1; 497 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask; 498 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/); 499 500 const Type *Ty = CPE.getType(); 501 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty); 502 503 // Emit the label with a comment on it. 504 if (VerboseAsm) { 505 OutStreamer.GetCommentOS() << "constant pool "; 506 WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(), 507 MF->getFunction()->getParent()); 508 OutStreamer.GetCommentOS() << '\n'; 509 } 510 OutStreamer.EmitLabel(GetCPISymbol(CPI)); 511 512 if (CPE.isMachineConstantPoolEntry()) 513 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); 514 else 515 EmitGlobalConstant(CPE.Val.ConstVal); 516 } 517 } 518} 519 520/// EmitJumpTableInfo - Print assembly representations of the jump tables used 521/// by the current function to the current output stream. 522/// 523void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) { 524 MachineJumpTableInfo *MJTI = MF.getJumpTableInfo(); 525 if (MJTI == 0) return; 526 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 527 if (JT.empty()) return; 528 529 // Pick the directive to use to print the jump table entries, and switch to 530 // the appropriate section. 531 const Function *F = MF.getFunction(); 532 bool JTInDiffSection = false; 533 if (// In PIC mode, we need to emit the jump table to the same section as the 534 // function body itself, otherwise the label differences won't make sense. 535 // FIXME: Need a better predicate for this: what about custom entries? 536 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 || 537 // We should also do if the section name is NULL or function is declared 538 // in discardable section 539 // FIXME: this isn't the right predicate, should be based on the MCSection 540 // for the function. 541 F->isWeakForLinker()) { 542 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, 543 TM)); 544 } else { 545 // Otherwise, drop it in the readonly section. 546 const MCSection *ReadOnlySection = 547 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly()); 548 OutStreamer.SwitchSection(ReadOnlySection); 549 JTInDiffSection = true; 550 } 551 552 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData()))); 553 554 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) { 555 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs; 556 557 // If this jump table was deleted, ignore it. 558 if (JTBBs.empty()) continue; 559 560 // For the EK_LabelDifference32 entry, if the target supports .set, emit a 561 // .set directive for each unique entry. This reduces the number of 562 // relocations the assembler will generate for the jump table. 563 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 && 564 MAI->hasSetDirective()) { 565 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets; 566 const TargetLowering *TLI = TM.getTargetLowering(); 567 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(&MF, JTI, 568 OutContext); 569 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 570 const MachineBasicBlock *MBB = JTBBs[ii]; 571 if (!EmittedSets.insert(MBB)) continue; 572 573 // .set LJTSet, LBB32-base 574 const MCExpr *LHS = 575 MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext); 576 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()), 577 MCBinaryExpr::CreateSub(LHS, Base, OutContext)); 578 } 579 } 580 581 // On some targets (e.g. Darwin) we want to emit two consequtive labels 582 // before each jump table. The first label is never referenced, but tells 583 // the assembler and linker the extents of the jump table object. The 584 // second label is actually referenced by the code. 585 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) 586 // FIXME: This doesn't have to have any specific name, just any randomly 587 // named and numbered 'l' label would work. Simplify GetJTISymbol. 588 OutStreamer.EmitLabel(GetJTISymbol(JTI, true)); 589 590 OutStreamer.EmitLabel(GetJTISymbol(JTI)); 591 592 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 593 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI); 594 } 595} 596 597/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the 598/// current stream. 599void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI, 600 const MachineBasicBlock *MBB, 601 unsigned UID) const { 602 const MCExpr *Value = 0; 603 switch (MJTI->getEntryKind()) { 604 case MachineJumpTableInfo::EK_Custom32: 605 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID, 606 OutContext); 607 break; 608 case MachineJumpTableInfo::EK_BlockAddress: 609 // EK_BlockAddress - Each entry is a plain address of block, e.g.: 610 // .word LBB123 611 Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext); 612 break; 613 case MachineJumpTableInfo::EK_GPRel32BlockAddress: { 614 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded 615 // with a relocation as gp-relative, e.g.: 616 // .gprel32 LBB123 617 MCSymbol *MBBSym = MBB->getSymbol(OutContext); 618 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext)); 619 return; 620 } 621 622 case MachineJumpTableInfo::EK_LabelDifference32: { 623 // EK_LabelDifference32 - Each entry is the address of the block minus 624 // the address of the jump table. This is used for PIC jump tables where 625 // gprel32 is not supported. e.g.: 626 // .word LBB123 - LJTI1_2 627 // If the .set directive is supported, this is emitted as: 628 // .set L4_5_set_123, LBB123 - LJTI1_2 629 // .word L4_5_set_123 630 631 // If we have emitted set directives for the jump table entries, print 632 // them rather than the entries themselves. If we're emitting PIC, then 633 // emit the table entries as differences between two text section labels. 634 if (MAI->hasSetDirective()) { 635 // If we used .set, reference the .set's symbol. 636 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()), 637 OutContext); 638 break; 639 } 640 // Otherwise, use the difference as the jump table entry. 641 Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext); 642 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext); 643 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext); 644 break; 645 } 646 } 647 648 assert(Value && "Unknown entry kind!"); 649 650 unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData()); 651 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0); 652} 653 654 655/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 656/// special global used by LLVM. If so, emit it and return true, otherwise 657/// do nothing and return false. 658bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 659 if (GV->getName() == "llvm.used") { 660 if (MAI->hasNoDeadStrip()) // No need to emit this at all. 661 EmitLLVMUsedList(GV->getInitializer()); 662 return true; 663 } 664 665 // Ignore debug and non-emitted data. This handles llvm.compiler.used. 666 if (GV->getSection() == "llvm.metadata" || 667 GV->hasAvailableExternallyLinkage()) 668 return true; 669 670 if (!GV->hasAppendingLinkage()) return false; 671 672 assert(GV->hasInitializer() && "Not a special LLVM global!"); 673 674 const TargetData *TD = TM.getTargetData(); 675 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 676 if (GV->getName() == "llvm.global_ctors") { 677 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection()); 678 EmitAlignment(Align, 0); 679 EmitXXStructorList(GV->getInitializer()); 680 681 if (TM.getRelocationModel() == Reloc::Static && 682 MAI->hasStaticCtorDtorReferenceInStaticMode()) { 683 StringRef Sym(".constructors_used"); 684 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 685 MCSA_Reference); 686 } 687 return true; 688 } 689 690 if (GV->getName() == "llvm.global_dtors") { 691 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection()); 692 EmitAlignment(Align, 0); 693 EmitXXStructorList(GV->getInitializer()); 694 695 if (TM.getRelocationModel() == Reloc::Static && 696 MAI->hasStaticCtorDtorReferenceInStaticMode()) { 697 StringRef Sym(".destructors_used"); 698 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym), 699 MCSA_Reference); 700 } 701 return true; 702 } 703 704 return false; 705} 706 707/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each 708/// global in the specified llvm.used list for which emitUsedDirectiveFor 709/// is true, as being used with this directive. 710void AsmPrinter::EmitLLVMUsedList(Constant *List) { 711 // Should be an array of 'i8*'. 712 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 713 if (InitList == 0) return; 714 715 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 716 const GlobalValue *GV = 717 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts()); 718 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) 719 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV), 720 MCSA_NoDeadStrip); 721 } 722} 723 724/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 725/// function pointers, ignoring the init priority. 726void AsmPrinter::EmitXXStructorList(Constant *List) { 727 // Should be an array of '{ int, void ()* }' structs. The first value is the 728 // init priority, which we ignore. 729 if (!isa<ConstantArray>(List)) return; 730 ConstantArray *InitList = cast<ConstantArray>(List); 731 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 732 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 733 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 734 735 if (CS->getOperand(1)->isNullValue()) 736 return; // Found a null terminator, exit printing. 737 // Emit the function pointer. 738 EmitGlobalConstant(CS->getOperand(1)); 739 } 740} 741 742//===--------------------------------------------------------------------===// 743// Emission and print routines 744// 745 746/// EmitInt8 - Emit a byte directive and value. 747/// 748void AsmPrinter::EmitInt8(int Value) const { 749 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/); 750} 751 752/// EmitInt16 - Emit a short directive and value. 753/// 754void AsmPrinter::EmitInt16(int Value) const { 755 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/); 756} 757 758/// EmitInt32 - Emit a long directive and value. 759/// 760void AsmPrinter::EmitInt32(int Value) const { 761 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/); 762} 763 764/// EmitInt64 - Emit a long long directive and value. 765/// 766void AsmPrinter::EmitInt64(uint64_t Value) const { 767 OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/); 768} 769 770//===----------------------------------------------------------------------===// 771 772// EmitAlignment - Emit an alignment directive to the specified power of 773// two boundary. For example, if you pass in 3 here, you will get an 8 774// byte alignment. If a global value is specified, and if that global has 775// an explicit alignment requested, it will unconditionally override the 776// alignment request. However, if ForcedAlignBits is specified, this value 777// has final say: the ultimate alignment will be the max of ForcedAlignBits 778// and the alignment computed with NumBits and the global. 779// 780// The algorithm is: 781// Align = NumBits; 782// if (GV && GV->hasalignment) Align = GV->getalignment(); 783// Align = std::max(Align, ForcedAlignBits); 784// 785void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 786 unsigned ForcedAlignBits, 787 bool UseFillExpr) const { 788 if (GV && GV->getAlignment()) 789 NumBits = Log2_32(GV->getAlignment()); 790 NumBits = std::max(NumBits, ForcedAlignBits); 791 792 if (NumBits == 0) return; // No need to emit alignment. 793 794 unsigned FillValue = 0; 795 if (getCurrentSection()->getKind().isText()) 796 FillValue = MAI->getTextAlignFillValue(); 797 798 OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0); 799} 800 801/// LowerConstant - Lower the specified LLVM Constant to an MCExpr. 802/// 803static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) { 804 MCContext &Ctx = AP.OutContext; 805 806 if (CV->isNullValue() || isa<UndefValue>(CV)) 807 return MCConstantExpr::Create(0, Ctx); 808 809 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) 810 return MCConstantExpr::Create(CI->getZExtValue(), Ctx); 811 812 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) 813 return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx); 814 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) 815 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx); 816 817 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV); 818 if (CE == 0) { 819 llvm_unreachable("Unknown constant value to lower!"); 820 return MCConstantExpr::Create(0, Ctx); 821 } 822 823 switch (CE->getOpcode()) { 824 case Instruction::ZExt: 825 case Instruction::SExt: 826 case Instruction::FPTrunc: 827 case Instruction::FPExt: 828 case Instruction::UIToFP: 829 case Instruction::SIToFP: 830 case Instruction::FPToUI: 831 case Instruction::FPToSI: 832 default: llvm_unreachable("FIXME: Don't support this constant cast expr"); 833 case Instruction::GetElementPtr: { 834 const TargetData &TD = *AP.TM.getTargetData(); 835 // Generate a symbolic expression for the byte address 836 const Constant *PtrVal = CE->getOperand(0); 837 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end()); 838 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0], 839 IdxVec.size()); 840 841 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP); 842 if (Offset == 0) 843 return Base; 844 845 // Truncate/sext the offset to the pointer size. 846 if (TD.getPointerSizeInBits() != 64) { 847 int SExtAmount = 64-TD.getPointerSizeInBits(); 848 Offset = (Offset << SExtAmount) >> SExtAmount; 849 } 850 851 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx), 852 Ctx); 853 } 854 855 case Instruction::Trunc: 856 // We emit the value and depend on the assembler to truncate the generated 857 // expression properly. This is important for differences between 858 // blockaddress labels. Since the two labels are in the same function, it 859 // is reasonable to treat their delta as a 32-bit value. 860 // FALL THROUGH. 861 case Instruction::BitCast: 862 return LowerConstant(CE->getOperand(0), AP); 863 864 case Instruction::IntToPtr: { 865 const TargetData &TD = *AP.TM.getTargetData(); 866 // Handle casts to pointers by changing them into casts to the appropriate 867 // integer type. This promotes constant folding and simplifies this code. 868 Constant *Op = CE->getOperand(0); 869 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()), 870 false/*ZExt*/); 871 return LowerConstant(Op, AP); 872 } 873 874 case Instruction::PtrToInt: { 875 const TargetData &TD = *AP.TM.getTargetData(); 876 // Support only foldable casts to/from pointers that can be eliminated by 877 // changing the pointer to the appropriately sized integer type. 878 Constant *Op = CE->getOperand(0); 879 const Type *Ty = CE->getType(); 880 881 const MCExpr *OpExpr = LowerConstant(Op, AP); 882 883 // We can emit the pointer value into this slot if the slot is an 884 // integer slot equal to the size of the pointer. 885 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType())) 886 return OpExpr; 887 888 // Otherwise the pointer is smaller than the resultant integer, mask off 889 // the high bits so we are sure to get a proper truncation if the input is 890 // a constant expr. 891 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType()); 892 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx); 893 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx); 894 } 895 896 case Instruction::Add: 897 case Instruction::Sub: 898 case Instruction::And: 899 case Instruction::Or: 900 case Instruction::Xor: { 901 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP); 902 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP); 903 switch (CE->getOpcode()) { 904 default: llvm_unreachable("Unknown binary operator constant cast expr"); 905 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx); 906 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx); 907 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx); 908 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx); 909 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx); 910 } 911 } 912 } 913} 914 915static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace, 916 AsmPrinter &AP) { 917 if (AddrSpace != 0 || !CA->isString()) { 918 // Not a string. Print the values in successive locations 919 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 920 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace); 921 return; 922 } 923 924 // Otherwise, it can be emitted as .ascii. 925 SmallVector<char, 128> TmpVec; 926 TmpVec.reserve(CA->getNumOperands()); 927 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 928 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue()); 929 930 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace); 931} 932 933static void EmitGlobalConstantVector(const ConstantVector *CV, 934 unsigned AddrSpace, AsmPrinter &AP) { 935 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i) 936 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace); 937} 938 939static void EmitGlobalConstantStruct(const ConstantStruct *CS, 940 unsigned AddrSpace, AsmPrinter &AP) { 941 // Print the fields in successive locations. Pad to align if needed! 942 const TargetData *TD = AP.TM.getTargetData(); 943 unsigned Size = TD->getTypeAllocSize(CS->getType()); 944 const StructLayout *Layout = TD->getStructLayout(CS->getType()); 945 uint64_t SizeSoFar = 0; 946 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) { 947 const Constant *Field = CS->getOperand(i); 948 949 // Check if padding is needed and insert one or more 0s. 950 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType()); 951 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1)) 952 - Layout->getElementOffset(i)) - FieldSize; 953 SizeSoFar += FieldSize + PadSize; 954 955 // Now print the actual field value. 956 AP.EmitGlobalConstant(Field, AddrSpace); 957 958 // Insert padding - this may include padding to increase the size of the 959 // current field up to the ABI size (if the struct is not packed) as well 960 // as padding to ensure that the next field starts at the right offset. 961 AP.OutStreamer.EmitZeros(PadSize, AddrSpace); 962 } 963 assert(SizeSoFar == Layout->getSizeInBytes() && 964 "Layout of constant struct may be incorrect!"); 965} 966 967static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace, 968 AsmPrinter &AP) { 969 // FP Constants are printed as integer constants to avoid losing 970 // precision. 971 if (CFP->getType()->isDoubleTy()) { 972 if (AP.VerboseAsm) { 973 double Val = CFP->getValueAPF().convertToDouble(); 974 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n'; 975 } 976 977 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 978 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 979 return; 980 } 981 982 if (CFP->getType()->isFloatTy()) { 983 if (AP.VerboseAsm) { 984 float Val = CFP->getValueAPF().convertToFloat(); 985 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n'; 986 } 987 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 988 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace); 989 return; 990 } 991 992 if (CFP->getType()->isX86_FP80Ty()) { 993 // all long double variants are printed as hex 994 // api needed to prevent premature destruction 995 APInt API = CFP->getValueAPF().bitcastToAPInt(); 996 const uint64_t *p = API.getRawData(); 997 if (AP.VerboseAsm) { 998 // Convert to double so we can print the approximate val as a comment. 999 APFloat DoubleVal = CFP->getValueAPF(); 1000 bool ignored; 1001 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 1002 &ignored); 1003 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= " 1004 << DoubleVal.convertToDouble() << '\n'; 1005 } 1006 1007 if (AP.TM.getTargetData()->isBigEndian()) { 1008 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 1009 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1010 } else { 1011 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1012 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace); 1013 } 1014 1015 // Emit the tail padding for the long double. 1016 const TargetData &TD = *AP.TM.getTargetData(); 1017 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) - 1018 TD.getTypeStoreSize(CFP->getType()), AddrSpace); 1019 return; 1020 } 1021 1022 assert(CFP->getType()->isPPC_FP128Ty() && 1023 "Floating point constant type not handled"); 1024 // All long double variants are printed as hex api needed to prevent 1025 // premature destruction. 1026 APInt API = CFP->getValueAPF().bitcastToAPInt(); 1027 const uint64_t *p = API.getRawData(); 1028 if (AP.TM.getTargetData()->isBigEndian()) { 1029 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1030 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 1031 } else { 1032 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace); 1033 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace); 1034 } 1035} 1036 1037static void EmitGlobalConstantLargeInt(const ConstantInt *CI, 1038 unsigned AddrSpace, AsmPrinter &AP) { 1039 const TargetData *TD = AP.TM.getTargetData(); 1040 unsigned BitWidth = CI->getBitWidth(); 1041 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits"); 1042 1043 // We don't expect assemblers to support integer data directives 1044 // for more than 64 bits, so we emit the data in at most 64-bit 1045 // quantities at a time. 1046 const uint64_t *RawData = CI->getValue().getRawData(); 1047 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1048 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i]; 1049 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace); 1050 } 1051} 1052 1053/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 1054void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { 1055 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) { 1056 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1057 return OutStreamer.EmitZeros(Size, AddrSpace); 1058 } 1059 1060 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1061 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1062 switch (Size) { 1063 case 1: 1064 case 2: 1065 case 4: 1066 case 8: 1067 if (VerboseAsm) 1068 OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue()); 1069 OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace); 1070 return; 1071 default: 1072 EmitGlobalConstantLargeInt(CI, AddrSpace, *this); 1073 return; 1074 } 1075 } 1076 1077 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) 1078 return EmitGlobalConstantArray(CVA, AddrSpace, *this); 1079 1080 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) 1081 return EmitGlobalConstantStruct(CVS, AddrSpace, *this); 1082 1083 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) 1084 return EmitGlobalConstantFP(CFP, AddrSpace, *this); 1085 1086 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV)) 1087 return EmitGlobalConstantVector(V, AddrSpace, *this); 1088 1089 if (isa<ConstantPointerNull>(CV)) { 1090 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType()); 1091 OutStreamer.EmitIntValue(0, Size, AddrSpace); 1092 return; 1093 } 1094 1095 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it 1096 // thread the streamer with EmitValue. 1097 OutStreamer.EmitValue(LowerConstant(CV, *this), 1098 TM.getTargetData()->getTypeAllocSize(CV->getType()), 1099 AddrSpace); 1100} 1101 1102void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1103 // Target doesn't support this yet! 1104 llvm_unreachable("Target does not support EmitMachineConstantPoolValue"); 1105} 1106 1107/// PrintSpecial - Print information related to the specified machine instr 1108/// that is independent of the operand, and may be independent of the instr 1109/// itself. This can be useful for portably encoding the comment character 1110/// or other bits of target-specific knowledge into the asmstrings. The 1111/// syntax used is ${:comment}. Targets can override this to add support 1112/// for their own strange codes. 1113void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const { 1114 if (!strcmp(Code, "private")) { 1115 O << MAI->getPrivateGlobalPrefix(); 1116 } else if (!strcmp(Code, "comment")) { 1117 if (VerboseAsm) 1118 O << MAI->getCommentString(); 1119 } else if (!strcmp(Code, "uid")) { 1120 // Comparing the address of MI isn't sufficient, because machineinstrs may 1121 // be allocated to the same address across functions. 1122 const Function *ThisF = MI->getParent()->getParent()->getFunction(); 1123 1124 // If this is a new LastFn instruction, bump the counter. 1125 if (LastMI != MI || LastFn != ThisF) { 1126 ++Counter; 1127 LastMI = MI; 1128 LastFn = ThisF; 1129 } 1130 O << Counter; 1131 } else { 1132 std::string msg; 1133 raw_string_ostream Msg(msg); 1134 Msg << "Unknown special formatter '" << Code 1135 << "' for machine instr: " << *MI; 1136 llvm_report_error(Msg.str()); 1137 } 1138} 1139 1140/// processDebugLoc - Processes the debug information of each machine 1141/// instruction's DebugLoc. 1142void AsmPrinter::processDebugLoc(const MachineInstr *MI, 1143 bool BeforePrintingInsn) { 1144 if (!MAI || !DW || !MAI->doesSupportDebugInformation() 1145 || !DW->ShouldEmitDwarfDebug()) 1146 return; 1147 DebugLoc DL = MI->getDebugLoc(); 1148 if (DL.isUnknown()) 1149 return; 1150 DILocation CurDLT = MF->getDILocation(DL); 1151 if (CurDLT.getScope().isNull()) 1152 return; 1153 1154 if (!BeforePrintingInsn) { 1155 // After printing instruction 1156 DW->EndScope(MI); 1157 } else if (CurDLT.getNode() != PrevDLT) { 1158 unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(), 1159 CurDLT.getColumnNumber(), 1160 CurDLT.getScope().getNode()); 1161 printLabel(L); 1162 O << '\n'; 1163 DW->BeginScope(MI, L); 1164 PrevDLT = CurDLT.getNode(); 1165 } 1166} 1167 1168 1169/// printInlineAsm - This method formats and prints the specified machine 1170/// instruction that is an inline asm. 1171void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { 1172 unsigned NumOperands = MI->getNumOperands(); 1173 1174 // Count the number of register definitions. 1175 unsigned NumDefs = 0; 1176 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef(); 1177 ++NumDefs) 1178 assert(NumDefs != NumOperands-1 && "No asm string?"); 1179 1180 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?"); 1181 1182 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. 1183 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); 1184 1185 O << '\t'; 1186 1187 // If this asmstr is empty, just print the #APP/#NOAPP markers. 1188 // These are useful to see where empty asm's wound up. 1189 if (AsmStr[0] == 0) { 1190 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1191 O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n'; 1192 return; 1193 } 1194 1195 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1196 1197 // The variant of the current asmprinter. 1198 int AsmPrinterVariant = MAI->getAssemblerDialect(); 1199 1200 int CurVariant = -1; // The number of the {.|.|.} region we are in. 1201 const char *LastEmitted = AsmStr; // One past the last character emitted. 1202 1203 while (*LastEmitted) { 1204 switch (*LastEmitted) { 1205 default: { 1206 // Not a special case, emit the string section literally. 1207 const char *LiteralEnd = LastEmitted+1; 1208 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && 1209 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') 1210 ++LiteralEnd; 1211 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1212 O.write(LastEmitted, LiteralEnd-LastEmitted); 1213 LastEmitted = LiteralEnd; 1214 break; 1215 } 1216 case '\n': 1217 ++LastEmitted; // Consume newline character. 1218 O << '\n'; // Indent code with newline. 1219 break; 1220 case '$': { 1221 ++LastEmitted; // Consume '$' character. 1222 bool Done = true; 1223 1224 // Handle escapes. 1225 switch (*LastEmitted) { 1226 default: Done = false; break; 1227 case '$': // $$ -> $ 1228 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1229 O << '$'; 1230 ++LastEmitted; // Consume second '$' character. 1231 break; 1232 case '(': // $( -> same as GCC's { character. 1233 ++LastEmitted; // Consume '(' character. 1234 if (CurVariant != -1) { 1235 llvm_report_error("Nested variants found in inline asm string: '" 1236 + std::string(AsmStr) + "'"); 1237 } 1238 CurVariant = 0; // We're in the first variant now. 1239 break; 1240 case '|': 1241 ++LastEmitted; // consume '|' character. 1242 if (CurVariant == -1) 1243 O << '|'; // this is gcc's behavior for | outside a variant 1244 else 1245 ++CurVariant; // We're in the next variant. 1246 break; 1247 case ')': // $) -> same as GCC's } char. 1248 ++LastEmitted; // consume ')' character. 1249 if (CurVariant == -1) 1250 O << '}'; // this is gcc's behavior for } outside a variant 1251 else 1252 CurVariant = -1; 1253 break; 1254 } 1255 if (Done) break; 1256 1257 bool HasCurlyBraces = false; 1258 if (*LastEmitted == '{') { // ${variable} 1259 ++LastEmitted; // Consume '{' character. 1260 HasCurlyBraces = true; 1261 } 1262 1263 // If we have ${:foo}, then this is not a real operand reference, it is a 1264 // "magic" string reference, just like in .td files. Arrange to call 1265 // PrintSpecial. 1266 if (HasCurlyBraces && *LastEmitted == ':') { 1267 ++LastEmitted; 1268 const char *StrStart = LastEmitted; 1269 const char *StrEnd = strchr(StrStart, '}'); 1270 if (StrEnd == 0) { 1271 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '" 1272 + std::string(AsmStr) + "'"); 1273 } 1274 1275 std::string Val(StrStart, StrEnd); 1276 PrintSpecial(MI, Val.c_str()); 1277 LastEmitted = StrEnd+1; 1278 break; 1279 } 1280 1281 const char *IDStart = LastEmitted; 1282 char *IDEnd; 1283 errno = 0; 1284 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. 1285 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { 1286 llvm_report_error("Bad $ operand number in inline asm string: '" 1287 + std::string(AsmStr) + "'"); 1288 } 1289 LastEmitted = IDEnd; 1290 1291 char Modifier[2] = { 0, 0 }; 1292 1293 if (HasCurlyBraces) { 1294 // If we have curly braces, check for a modifier character. This 1295 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. 1296 if (*LastEmitted == ':') { 1297 ++LastEmitted; // Consume ':' character. 1298 if (*LastEmitted == 0) { 1299 llvm_report_error("Bad ${:} expression in inline asm string: '" 1300 + std::string(AsmStr) + "'"); 1301 } 1302 1303 Modifier[0] = *LastEmitted; 1304 ++LastEmitted; // Consume modifier character. 1305 } 1306 1307 if (*LastEmitted != '}') { 1308 llvm_report_error("Bad ${} expression in inline asm string: '" 1309 + std::string(AsmStr) + "'"); 1310 } 1311 ++LastEmitted; // Consume '}' character. 1312 } 1313 1314 if ((unsigned)Val >= NumOperands-1) { 1315 llvm_report_error("Invalid $ operand number in inline asm string: '" 1316 + std::string(AsmStr) + "'"); 1317 } 1318 1319 // Okay, we finally have a value number. Ask the target to print this 1320 // operand! 1321 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { 1322 unsigned OpNo = 1; 1323 1324 bool Error = false; 1325 1326 // Scan to find the machine operand number for the operand. 1327 for (; Val; --Val) { 1328 if (OpNo >= MI->getNumOperands()) break; 1329 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1330 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1; 1331 } 1332 1333 if (OpNo >= MI->getNumOperands()) { 1334 Error = true; 1335 } else { 1336 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1337 ++OpNo; // Skip over the ID number. 1338 1339 if (Modifier[0] == 'l') // labels are target independent 1340 O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext); 1341 else { 1342 AsmPrinter *AP = const_cast<AsmPrinter*>(this); 1343 if ((OpFlags & 7) == 4) { 1344 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, 1345 Modifier[0] ? Modifier : 0); 1346 } else { 1347 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, 1348 Modifier[0] ? Modifier : 0); 1349 } 1350 } 1351 } 1352 if (Error) { 1353 std::string msg; 1354 raw_string_ostream Msg(msg); 1355 Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n"; 1356 MI->print(Msg); 1357 llvm_report_error(Msg.str()); 1358 } 1359 } 1360 break; 1361 } 1362 } 1363 } 1364 O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd(); 1365} 1366 1367/// printImplicitDef - This method prints the specified machine instruction 1368/// that is an implicit def. 1369void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { 1370 if (!VerboseAsm) return; 1371 O.PadToColumn(MAI->getCommentColumn()); 1372 O << MAI->getCommentString() << " implicit-def: " 1373 << TRI->getName(MI->getOperand(0).getReg()); 1374} 1375 1376void AsmPrinter::printKill(const MachineInstr *MI) const { 1377 if (!VerboseAsm) return; 1378 O.PadToColumn(MAI->getCommentColumn()); 1379 O << MAI->getCommentString() << " kill:"; 1380 for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) { 1381 const MachineOperand &op = MI->getOperand(n); 1382 assert(op.isReg() && "KILL instruction must have only register operands"); 1383 O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>"); 1384 } 1385} 1386 1387/// printLabel - This method prints a local label used by debug and 1388/// exception handling tables. 1389void AsmPrinter::printLabel(const MachineInstr *MI) const { 1390 printLabel(MI->getOperand(0).getImm()); 1391} 1392 1393void AsmPrinter::printLabel(unsigned Id) const { 1394 O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':'; 1395} 1396 1397/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 1398/// instruction, using the specified assembler variant. Targets should 1399/// override this to format as appropriate. 1400bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 1401 unsigned AsmVariant, const char *ExtraCode) { 1402 // Target doesn't support this yet! 1403 return true; 1404} 1405 1406bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 1407 unsigned AsmVariant, 1408 const char *ExtraCode) { 1409 // Target doesn't support this yet! 1410 return true; 1411} 1412 1413MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA, 1414 const char *Suffix) const { 1415 return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix); 1416} 1417 1418MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F, 1419 const BasicBlock *BB, 1420 const char *Suffix) const { 1421 assert(BB->hasName() && 1422 "Address of anonymous basic block not supported yet!"); 1423 1424 // This code must use the function name itself, and not the function number, 1425 // since it must be possible to generate the label name from within other 1426 // functions. 1427 SmallString<60> FnName; 1428 Mang->getNameWithPrefix(FnName, F, false); 1429 1430 // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME! 1431 SmallString<60> NameResult; 1432 Mang->getNameWithPrefix(NameResult, 1433 StringRef("BA") + Twine((unsigned)FnName.size()) + 1434 "_" + FnName.str() + "_" + BB->getName() + Suffix, 1435 Mangler::Private); 1436 1437 return OutContext.GetOrCreateSymbol(NameResult.str()); 1438} 1439 1440/// GetCPISymbol - Return the symbol for the specified constant pool entry. 1441MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const { 1442 SmallString<60> Name; 1443 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI" 1444 << getFunctionNumber() << '_' << CPID; 1445 return OutContext.GetOrCreateSymbol(Name.str()); 1446} 1447 1448/// GetJTISymbol - Return the symbol for the specified jump table entry. 1449MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const { 1450 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate); 1451} 1452 1453/// GetJTSetSymbol - Return the symbol for the specified jump table .set 1454/// FIXME: privatize to AsmPrinter. 1455MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const { 1456 SmallString<60> Name; 1457 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() 1458 << getFunctionNumber() << '_' << UID << "_set_" << MBBID; 1459 return OutContext.GetOrCreateSymbol(Name.str()); 1460} 1461 1462/// GetGlobalValueSymbol - Return the MCSymbol for the specified global 1463/// value. 1464MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const { 1465 SmallString<60> NameStr; 1466 Mang->getNameWithPrefix(NameStr, GV, false); 1467 return OutContext.GetOrCreateSymbol(NameStr.str()); 1468} 1469 1470/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with 1471/// global value name as its base, with the specified suffix, and where the 1472/// symbol is forced to have private linkage if ForcePrivate is true. 1473MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV, 1474 StringRef Suffix, 1475 bool ForcePrivate) const { 1476 SmallString<60> NameStr; 1477 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate); 1478 NameStr.append(Suffix.begin(), Suffix.end()); 1479 return OutContext.GetOrCreateSymbol(NameStr.str()); 1480} 1481 1482/// GetExternalSymbolSymbol - Return the MCSymbol for the specified 1483/// ExternalSymbol. 1484MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const { 1485 SmallString<60> NameStr; 1486 Mang->getNameWithPrefix(NameStr, Sym); 1487 return OutContext.GetOrCreateSymbol(NameStr.str()); 1488} 1489 1490 1491 1492/// PrintParentLoopComment - Print comments about parent loops of this one. 1493static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1494 unsigned FunctionNumber) { 1495 if (Loop == 0) return; 1496 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber); 1497 OS.indent(Loop->getLoopDepth()*2) 1498 << "Parent Loop BB" << FunctionNumber << "_" 1499 << Loop->getHeader()->getNumber() 1500 << " Depth=" << Loop->getLoopDepth() << '\n'; 1501} 1502 1503 1504/// PrintChildLoopComment - Print comments about child loops within 1505/// the loop for this basic block, with nesting. 1506static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop, 1507 unsigned FunctionNumber) { 1508 // Add child loop information 1509 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){ 1510 OS.indent((*CL)->getLoopDepth()*2) 1511 << "Child Loop BB" << FunctionNumber << "_" 1512 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth() 1513 << '\n'; 1514 PrintChildLoopComment(OS, *CL, FunctionNumber); 1515 } 1516} 1517 1518/// EmitComments - Pretty-print comments for basic blocks. 1519static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB, 1520 const MachineLoopInfo *LI, 1521 const AsmPrinter &AP) { 1522 // Add loop depth information 1523 const MachineLoop *Loop = LI->getLoopFor(&MBB); 1524 if (Loop == 0) return; 1525 1526 MachineBasicBlock *Header = Loop->getHeader(); 1527 assert(Header && "No header for loop"); 1528 1529 // If this block is not a loop header, just print out what is the loop header 1530 // and return. 1531 if (Header != &MBB) { 1532 AP.OutStreamer.AddComment(" in Loop: Header=BB" + 1533 Twine(AP.getFunctionNumber())+"_" + 1534 Twine(Loop->getHeader()->getNumber())+ 1535 " Depth="+Twine(Loop->getLoopDepth())); 1536 return; 1537 } 1538 1539 // Otherwise, it is a loop header. Print out information about child and 1540 // parent loops. 1541 raw_ostream &OS = AP.OutStreamer.GetCommentOS(); 1542 1543 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber()); 1544 1545 OS << "=>"; 1546 OS.indent(Loop->getLoopDepth()*2-2); 1547 1548 OS << "This "; 1549 if (Loop->empty()) 1550 OS << "Inner "; 1551 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n'; 1552 1553 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber()); 1554} 1555 1556 1557/// EmitBasicBlockStart - This method prints the label for the specified 1558/// MachineBasicBlock, an alignment (if present) and a comment describing 1559/// it if appropriate. 1560void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { 1561 // Emit an alignment directive for this block, if needed. 1562 if (unsigned Align = MBB->getAlignment()) 1563 EmitAlignment(Log2_32(Align)); 1564 1565 // If the block has its address taken, emit a special label to satisfy 1566 // references to the block. This is done so that we don't need to 1567 // remember the number of this label, and so that we can make 1568 // forward references to labels without knowing what their numbers 1569 // will be. 1570 if (MBB->hasAddressTaken()) { 1571 const BasicBlock *BB = MBB->getBasicBlock(); 1572 if (VerboseAsm) 1573 OutStreamer.AddComment("Address Taken"); 1574 OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB)); 1575 } 1576 1577 // Print the main label for the block. 1578 if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) { 1579 if (VerboseAsm) { 1580 // NOTE: Want this comment at start of line. 1581 O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':'; 1582 if (const BasicBlock *BB = MBB->getBasicBlock()) 1583 if (BB->hasName()) 1584 OutStreamer.AddComment("%" + BB->getName()); 1585 1586 PrintBasicBlockLoopComments(*MBB, LI, *this); 1587 OutStreamer.AddBlankLine(); 1588 } 1589 } else { 1590 if (VerboseAsm) { 1591 if (const BasicBlock *BB = MBB->getBasicBlock()) 1592 if (BB->hasName()) 1593 OutStreamer.AddComment("%" + BB->getName()); 1594 PrintBasicBlockLoopComments(*MBB, LI, *this); 1595 } 1596 1597 OutStreamer.EmitLabel(MBB->getSymbol(OutContext)); 1598 } 1599} 1600 1601void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const { 1602 // FIXME: RENAME TO EmitVisibility. 1603 MCSymbolAttr Attr = MCSA_Invalid; 1604 1605 switch (Visibility) { 1606 default: break; 1607 case GlobalValue::HiddenVisibility: 1608 Attr = MAI->getHiddenVisibilityAttr(); 1609 break; 1610 case GlobalValue::ProtectedVisibility: 1611 Attr = MAI->getProtectedVisibilityAttr(); 1612 break; 1613 } 1614 1615 if (Attr != MCSA_Invalid) 1616 OutStreamer.EmitSymbolAttribute(Sym, Attr); 1617} 1618 1619void AsmPrinter::printOffset(int64_t Offset) const { 1620 if (Offset > 0) 1621 O << '+' << Offset; 1622 else if (Offset < 0) 1623 O << Offset; 1624} 1625 1626GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1627 if (!S->usesMetadata()) 1628 return 0; 1629 1630 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1631 if (GCPI != GCMetadataPrinters.end()) 1632 return GCPI->second; 1633 1634 const char *Name = S->getName().c_str(); 1635 1636 for (GCMetadataPrinterRegistry::iterator 1637 I = GCMetadataPrinterRegistry::begin(), 1638 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1639 if (strcmp(Name, I->getName()) == 0) { 1640 GCMetadataPrinter *GMP = I->instantiate(); 1641 GMP->S = S; 1642 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1643 return GMP; 1644 } 1645 1646 llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name)); 1647 return 0; 1648} 1649 1650/// EmitComments - Pretty-print comments for instructions 1651void AsmPrinter::EmitComments(const MachineInstr &MI) const { 1652 if (!VerboseAsm) 1653 return; 1654 1655 bool Newline = false; 1656 1657 if (!MI.getDebugLoc().isUnknown()) { 1658 DILocation DLT = MF->getDILocation(MI.getDebugLoc()); 1659 1660 // Print source line info. 1661 O.PadToColumn(MAI->getCommentColumn()); 1662 O << MAI->getCommentString() << ' '; 1663 DIScope Scope = DLT.getScope(); 1664 // Omit the directory, because it's likely to be long and uninteresting. 1665 if (!Scope.isNull()) 1666 O << Scope.getFilename(); 1667 else 1668 O << "<unknown>"; 1669 O << ':' << DLT.getLineNumber(); 1670 if (DLT.getColumnNumber() != 0) 1671 O << ':' << DLT.getColumnNumber(); 1672 Newline = true; 1673 } 1674 1675 // Check for spills and reloads 1676 int FI; 1677 1678 const MachineFrameInfo *FrameInfo = 1679 MI.getParent()->getParent()->getFrameInfo(); 1680 1681 // We assume a single instruction only has a spill or reload, not 1682 // both. 1683 const MachineMemOperand *MMO; 1684 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) { 1685 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1686 MMO = *MI.memoperands_begin(); 1687 if (Newline) O << '\n'; 1688 O.PadToColumn(MAI->getCommentColumn()); 1689 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload"; 1690 Newline = true; 1691 } 1692 } 1693 else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) { 1694 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1695 if (Newline) O << '\n'; 1696 O.PadToColumn(MAI->getCommentColumn()); 1697 O << MAI->getCommentString() << ' ' 1698 << MMO->getSize() << "-byte Folded Reload"; 1699 Newline = true; 1700 } 1701 } 1702 else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) { 1703 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1704 MMO = *MI.memoperands_begin(); 1705 if (Newline) O << '\n'; 1706 O.PadToColumn(MAI->getCommentColumn()); 1707 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill"; 1708 Newline = true; 1709 } 1710 } 1711 else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) { 1712 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1713 if (Newline) O << '\n'; 1714 O.PadToColumn(MAI->getCommentColumn()); 1715 O << MAI->getCommentString() << ' ' 1716 << MMO->getSize() << "-byte Folded Spill"; 1717 Newline = true; 1718 } 1719 } 1720 1721 // Check for spill-induced copies 1722 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx; 1723 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg, 1724 SrcSubIdx, DstSubIdx)) { 1725 if (MI.getAsmPrinterFlag(ReloadReuse)) { 1726 if (Newline) O << '\n'; 1727 O.PadToColumn(MAI->getCommentColumn()); 1728 O << MAI->getCommentString() << " Reload Reuse"; 1729 } 1730 } 1731} 1732 1733