AsmPrinter.cpp revision 92c78e8e9a83b4971a4173cde5a0c28f571bd485
1//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the AsmPrinter class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/CodeGen/AsmPrinter.h" 15#include "llvm/Assembly/Writer.h" 16#include "llvm/DerivedTypes.h" 17#include "llvm/Constants.h" 18#include "llvm/Module.h" 19#include "llvm/CodeGen/DwarfWriter.h" 20#include "llvm/CodeGen/GCMetadataPrinter.h" 21#include "llvm/CodeGen/MachineConstantPool.h" 22#include "llvm/CodeGen/MachineFrameInfo.h" 23#include "llvm/CodeGen/MachineFunction.h" 24#include "llvm/CodeGen/MachineJumpTableInfo.h" 25#include "llvm/CodeGen/MachineLoopInfo.h" 26#include "llvm/CodeGen/MachineModuleInfo.h" 27#include "llvm/Analysis/DebugInfo.h" 28#include "llvm/MC/MCContext.h" 29#include "llvm/MC/MCInst.h" 30#include "llvm/MC/MCSection.h" 31#include "llvm/MC/MCStreamer.h" 32#include "llvm/MC/MCSymbol.h" 33#include "llvm/Support/CommandLine.h" 34#include "llvm/Support/ErrorHandling.h" 35#include "llvm/Support/FormattedStream.h" 36#include "llvm/MC/MCAsmInfo.h" 37#include "llvm/Target/Mangler.h" 38#include "llvm/Target/TargetData.h" 39#include "llvm/Target/TargetInstrInfo.h" 40#include "llvm/Target/TargetLowering.h" 41#include "llvm/Target/TargetLoweringObjectFile.h" 42#include "llvm/Target/TargetOptions.h" 43#include "llvm/Target/TargetRegisterInfo.h" 44#include "llvm/ADT/SmallPtrSet.h" 45#include "llvm/ADT/SmallString.h" 46#include <cerrno> 47using namespace llvm; 48 49static cl::opt<cl::boolOrDefault> 50AsmVerbose("asm-verbose", cl::desc("Add comments to directives."), 51 cl::init(cl::BOU_UNSET)); 52 53char AsmPrinter::ID = 0; 54AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm, 55 const MCAsmInfo *T, bool VDef) 56 : MachineFunctionPass(&ID), FunctionNumber(0), O(o), 57 TM(tm), MAI(T), TRI(tm.getRegisterInfo()), 58 59 OutContext(*new MCContext()), 60 // FIXME: Pass instprinter to streamer. 61 OutStreamer(*createAsmStreamer(OutContext, O, *T, 62 TM.getTargetData()->isLittleEndian(), 0)), 63 64 LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) { 65 DW = 0; MMI = 0; 66 switch (AsmVerbose) { 67 case cl::BOU_UNSET: VerboseAsm = VDef; break; 68 case cl::BOU_TRUE: VerboseAsm = true; break; 69 case cl::BOU_FALSE: VerboseAsm = false; break; 70 } 71} 72 73AsmPrinter::~AsmPrinter() { 74 for (gcp_iterator I = GCMetadataPrinters.begin(), 75 E = GCMetadataPrinters.end(); I != E; ++I) 76 delete I->second; 77 78 delete &OutStreamer; 79 delete &OutContext; 80} 81 82TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const { 83 return TM.getTargetLowering()->getObjFileLowering(); 84} 85 86/// getCurrentSection() - Return the current section we are emitting to. 87const MCSection *AsmPrinter::getCurrentSection() const { 88 return OutStreamer.getCurrentSection(); 89} 90 91 92void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { 93 AU.setPreservesAll(); 94 MachineFunctionPass::getAnalysisUsage(AU); 95 AU.addRequired<GCModuleInfo>(); 96 if (VerboseAsm) 97 AU.addRequired<MachineLoopInfo>(); 98} 99 100bool AsmPrinter::doInitialization(Module &M) { 101 // Initialize TargetLoweringObjectFile. 102 const_cast<TargetLoweringObjectFile&>(getObjFileLowering()) 103 .Initialize(OutContext, TM); 104 105 Mang = new Mangler(*MAI); 106 107 // Allow the target to emit any magic that it wants at the start of the file. 108 EmitStartOfAsmFile(M); 109 110 if (MAI->hasSingleParameterDotFile()) { 111 /* Very minimal debug info. It is ignored if we emit actual 112 debug info. If we don't, this at least helps the user find where 113 a function came from. */ 114 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n"; 115 } 116 117 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 118 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 119 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 120 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 121 MP->beginAssembly(O, *this, *MAI); 122 123 if (!M.getModuleInlineAsm().empty()) 124 O << MAI->getCommentString() << " Start of file scope inline assembly\n" 125 << M.getModuleInlineAsm() 126 << '\n' << MAI->getCommentString() 127 << " End of file scope inline assembly\n"; 128 129 MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 130 if (MMI) 131 MMI->AnalyzeModule(M); 132 DW = getAnalysisIfAvailable<DwarfWriter>(); 133 if (DW) 134 DW->BeginModule(&M, MMI, O, this, MAI); 135 136 return false; 137} 138 139/// EmitGlobalVariable - Emit the specified global variable to the .s file. 140void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { 141 if (!GV->hasInitializer()) // External globals require no code. 142 return; 143 144 // Check to see if this is a special global used by LLVM, if so, emit it. 145 if (EmitSpecialLLVMGlobal(GV)) 146 return; 147 148 MCSymbol *GVSym = GetGlobalValueSymbol(GV); 149 printVisibility(GVSym, GV->getVisibility()); 150 151 if (MAI->hasDotTypeDotSizeDirective()) { 152 O << "\t.type\t" << *GVSym; 153 if (MAI->getCommentString()[0] != '@') 154 O << ",@object\n"; 155 else 156 O << ",%object\n"; 157 } 158 159 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM); 160 161 const TargetData *TD = TM.getTargetData(); 162 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType()); 163 unsigned AlignLog = TD->getPreferredAlignmentLog(GV); 164 165 // Handle common and BSS local symbols (.lcomm). 166 if (GVKind.isCommon() || GVKind.isBSSLocal()) { 167 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 168 169 if (VerboseAsm) { 170 O.PadToColumn(MAI->getCommentColumn()); 171 O << MAI->getCommentString() << ' '; 172 WriteAsOperand(O, GV, /*PrintType=*/false, GV->getParent()); 173 O << '\n'; 174 } 175 176 // Handle common symbols. 177 if (GVKind.isCommon()) { 178 // .comm _foo, 42, 4 179 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 180 return; 181 } 182 183 // Handle local BSS symbols. 184 if (MAI->hasMachoZeroFillDirective()) { 185 const MCSection *TheSection = 186 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 187 // .zerofill __DATA, __bss, _foo, 400, 5 188 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 189 return; 190 } 191 192 if (const char *LComm = MAI->getLCOMMDirective()) { 193 // .lcomm _foo, 42 194 O << LComm << *GVSym << ',' << Size; 195 O << '\n'; 196 return; 197 } 198 199 // .local _foo 200 O << "\t.local\t" << *GVSym << '\n'; 201 // .comm _foo, 42, 4 202 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog); 203 return; 204 } 205 206 const MCSection *TheSection = 207 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM); 208 209 // Handle the zerofill directive on darwin, which is a special form of BSS 210 // emission. 211 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) { 212 // .globl _foo 213 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global); 214 // .zerofill __DATA, __common, _foo, 400, 5 215 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog); 216 return; 217 } 218 219 OutStreamer.SwitchSection(TheSection); 220 221 // TODO: Factor into an 'emit linkage' thing that is shared with function 222 // bodies. 223 switch (GV->getLinkage()) { 224 case GlobalValue::CommonLinkage: 225 case GlobalValue::LinkOnceAnyLinkage: 226 case GlobalValue::LinkOnceODRLinkage: 227 case GlobalValue::WeakAnyLinkage: 228 case GlobalValue::WeakODRLinkage: 229 case GlobalValue::LinkerPrivateLinkage: 230 if (MAI->getWeakDefDirective() != 0) { 231 // .globl _foo 232 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global); 233 // .weak_definition _foo 234 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::WeakDefinition); 235 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) { 236 // .globl _foo 237 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global); 238 // .linkonce same_size 239 O << LinkOnce; 240 } else { 241 // .weak _foo 242 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Weak); 243 } 244 break; 245 case GlobalValue::DLLExportLinkage: 246 case GlobalValue::AppendingLinkage: 247 // FIXME: appending linkage variables should go into a section of 248 // their name or something. For now, just emit them as external. 249 case GlobalValue::ExternalLinkage: 250 // If external or appending, declare as a global symbol. 251 // .globl _foo 252 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global); 253 break; 254 case GlobalValue::PrivateLinkage: 255 case GlobalValue::InternalLinkage: 256 break; 257 default: 258 llvm_unreachable("Unknown linkage type!"); 259 } 260 261 EmitAlignment(AlignLog, GV); 262 if (VerboseAsm) { 263 O.PadToColumn(MAI->getCommentColumn()); 264 O << MAI->getCommentString() << ' '; 265 WriteAsOperand(O, GV, /*PrintType=*/false, GV->getParent()); 266 O << '\n'; 267 } 268 OutStreamer.EmitLabel(GVSym); 269 270 EmitGlobalConstant(GV->getInitializer()); 271 272 if (MAI->hasDotTypeDotSizeDirective()) 273 O << "\t.size\t" << *GVSym << ", " << Size << '\n'; 274} 275 276 277bool AsmPrinter::doFinalization(Module &M) { 278 // Emit global variables. 279 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 280 I != E; ++I) 281 EmitGlobalVariable(I); 282 283 // Emit final debug information. 284 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling()) 285 DW->EndModule(); 286 287 // If the target wants to know about weak references, print them all. 288 if (MAI->getWeakRefDirective()) { 289 // FIXME: This is not lazy, it would be nice to only print weak references 290 // to stuff that is actually used. Note that doing so would require targets 291 // to notice uses in operands (due to constant exprs etc). This should 292 // happen with the MC stuff eventually. 293 294 // Print out module-level global variables here. 295 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 296 I != E; ++I) { 297 if (!I->hasExternalWeakLinkage()) continue; 298 O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n'; 299 } 300 301 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) { 302 if (!I->hasExternalWeakLinkage()) continue; 303 O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n'; 304 } 305 } 306 307 if (MAI->getSetDirective()) { 308 O << '\n'; 309 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 310 I != E; ++I) { 311 MCSymbol *Name = GetGlobalValueSymbol(I); 312 313 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 314 MCSymbol *Target = GetGlobalValueSymbol(GV); 315 316 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective()) 317 O << "\t.globl\t" << *Name << '\n'; 318 else if (I->hasWeakLinkage()) 319 O << MAI->getWeakRefDirective() << *Name << '\n'; 320 else 321 assert(I->hasLocalLinkage() && "Invalid alias linkage"); 322 323 printVisibility(Name, I->getVisibility()); 324 325 O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n'; 326 } 327 } 328 329 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 330 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 331 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 332 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 333 MP->finishAssembly(O, *this, *MAI); 334 335 // If we don't have any trampolines, then we don't require stack memory 336 // to be executable. Some targets have a directive to declare this. 337 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 338 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 339 if (MAI->getNonexecutableStackDirective()) 340 O << MAI->getNonexecutableStackDirective() << '\n'; 341 342 343 // Allow the target to emit any magic that it wants at the end of the file, 344 // after everything else has gone out. 345 EmitEndOfAsmFile(M); 346 347 delete Mang; Mang = 0; 348 DW = 0; MMI = 0; 349 350 OutStreamer.Finish(); 351 return false; 352} 353 354void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 355 // Get the function symbol. 356 CurrentFnSym = GetGlobalValueSymbol(MF.getFunction()); 357 IncrementFunctionNumber(); 358 359 if (VerboseAsm) 360 LI = &getAnalysis<MachineLoopInfo>(); 361} 362 363namespace { 364 // SectionCPs - Keep track the alignment, constpool entries per Section. 365 struct SectionCPs { 366 const MCSection *S; 367 unsigned Alignment; 368 SmallVector<unsigned, 4> CPEs; 369 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {} 370 }; 371} 372 373/// EmitConstantPool - Print to the current output stream assembly 374/// representations of the constants in the constant pool MCP. This is 375/// used to print out constants which have been "spilled to memory" by 376/// the code generator. 377/// 378void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) { 379 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 380 if (CP.empty()) return; 381 382 // Calculate sections for constant pool entries. We collect entries to go into 383 // the same section together to reduce amount of section switch statements. 384 SmallVector<SectionCPs, 4> CPSections; 385 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 386 const MachineConstantPoolEntry &CPE = CP[i]; 387 unsigned Align = CPE.getAlignment(); 388 389 SectionKind Kind; 390 switch (CPE.getRelocationInfo()) { 391 default: llvm_unreachable("Unknown section kind"); 392 case 2: Kind = SectionKind::getReadOnlyWithRel(); break; 393 case 1: 394 Kind = SectionKind::getReadOnlyWithRelLocal(); 395 break; 396 case 0: 397 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) { 398 case 4: Kind = SectionKind::getMergeableConst4(); break; 399 case 8: Kind = SectionKind::getMergeableConst8(); break; 400 case 16: Kind = SectionKind::getMergeableConst16();break; 401 default: Kind = SectionKind::getMergeableConst(); break; 402 } 403 } 404 405 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind); 406 407 // The number of sections are small, just do a linear search from the 408 // last section to the first. 409 bool Found = false; 410 unsigned SecIdx = CPSections.size(); 411 while (SecIdx != 0) { 412 if (CPSections[--SecIdx].S == S) { 413 Found = true; 414 break; 415 } 416 } 417 if (!Found) { 418 SecIdx = CPSections.size(); 419 CPSections.push_back(SectionCPs(S, Align)); 420 } 421 422 if (Align > CPSections[SecIdx].Alignment) 423 CPSections[SecIdx].Alignment = Align; 424 CPSections[SecIdx].CPEs.push_back(i); 425 } 426 427 // Now print stuff into the calculated sections. 428 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) { 429 OutStreamer.SwitchSection(CPSections[i].S); 430 EmitAlignment(Log2_32(CPSections[i].Alignment)); 431 432 unsigned Offset = 0; 433 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) { 434 unsigned CPI = CPSections[i].CPEs[j]; 435 MachineConstantPoolEntry CPE = CP[CPI]; 436 437 // Emit inter-object padding for alignment. 438 unsigned AlignMask = CPE.getAlignment() - 1; 439 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask; 440 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/); 441 442 const Type *Ty = CPE.getType(); 443 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty); 444 445 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' 446 << CPI << ':'; 447 if (VerboseAsm) { 448 O.PadToColumn(MAI->getCommentColumn()); 449 O << MAI->getCommentString() << " constant "; 450 WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent()); 451 } 452 O << '\n'; 453 if (CPE.isMachineConstantPoolEntry()) 454 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); 455 else 456 EmitGlobalConstant(CPE.Val.ConstVal); 457 } 458 } 459} 460 461/// EmitJumpTableInfo - Print assembly representations of the jump tables used 462/// by the current function to the current output stream. 463/// 464void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI, 465 MachineFunction &MF) { 466 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 467 if (JT.empty()) return; 468 469 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 470 471 // Pick the directive to use to print the jump table entries, and switch to 472 // the appropriate section. 473 TargetLowering *LoweringInfo = TM.getTargetLowering(); 474 475 const Function *F = MF.getFunction(); 476 bool JTInDiffSection = false; 477 if (F->isWeakForLinker() || 478 (IsPic && !LoweringInfo->usesGlobalOffsetTable())) { 479 // In PIC mode, we need to emit the jump table to the same section as the 480 // function body itself, otherwise the label differences won't make sense. 481 // We should also do if the section name is NULL or function is declared in 482 // discardable section. 483 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, 484 TM)); 485 } else { 486 // Otherwise, drop it in the readonly section. 487 const MCSection *ReadOnlySection = 488 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly()); 489 OutStreamer.SwitchSection(ReadOnlySection); 490 JTInDiffSection = true; 491 } 492 493 EmitAlignment(Log2_32(MJTI->getAlignment())); 494 495 for (unsigned i = 0, e = JT.size(); i != e; ++i) { 496 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; 497 498 // If this jump table was deleted, ignore it. 499 if (JTBBs.empty()) continue; 500 501 // For PIC codegen, if possible we want to use the SetDirective to reduce 502 // the number of relocations the assembler will generate for the jump table. 503 // Set directives are all printed before the jump table itself. 504 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; 505 if (MAI->getSetDirective() && IsPic) 506 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 507 if (EmittedSets.insert(JTBBs[ii])) 508 printPICJumpTableSetLabel(i, JTBBs[ii]); 509 510 // On some targets (e.g. Darwin) we want to emit two consequtive labels 511 // before each jump table. The first label is never referenced, but tells 512 // the assembler and linker the extents of the jump table object. The 513 // second label is actually referenced by the code. 514 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) { 515 O << MAI->getLinkerPrivateGlobalPrefix() 516 << "JTI" << getFunctionNumber() << '_' << i << ":\n"; 517 } 518 519 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 520 << '_' << i << ":\n"; 521 522 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 523 printPICJumpTableEntry(MJTI, JTBBs[ii], i); 524 O << '\n'; 525 } 526 } 527} 528 529void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, 530 const MachineBasicBlock *MBB, 531 unsigned uid) const { 532 bool isPIC = TM.getRelocationModel() == Reloc::PIC_; 533 534 // Use JumpTableDirective otherwise honor the entry size from the jump table 535 // info. 536 const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC); 537 bool HadJTEntryDirective = JTEntryDirective != NULL; 538 if (!HadJTEntryDirective) { 539 JTEntryDirective = MJTI->getEntrySize() == 4 ? 540 MAI->getData32bitsDirective() : MAI->getData64bitsDirective(); 541 } 542 543 O << JTEntryDirective << ' '; 544 545 // If we have emitted set directives for the jump table entries, print 546 // them rather than the entries themselves. If we're emitting PIC, then 547 // emit the table entries as differences between two text section labels. 548 // If we're emitting non-PIC code, then emit the entries as direct 549 // references to the target basic blocks. 550 if (!isPIC) { 551 O << *GetMBBSymbol(MBB->getNumber()); 552 } else if (MAI->getSetDirective()) { 553 O << MAI->getPrivateGlobalPrefix() << getFunctionNumber() 554 << '_' << uid << "_set_" << MBB->getNumber(); 555 } else { 556 O << *GetMBBSymbol(MBB->getNumber()); 557 // If the arch uses custom Jump Table directives, don't calc relative to 558 // JT 559 if (!HadJTEntryDirective) 560 O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" 561 << getFunctionNumber() << '_' << uid; 562 } 563} 564 565 566/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 567/// special global used by LLVM. If so, emit it and return true, otherwise 568/// do nothing and return false. 569bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 570 if (GV->getName() == "llvm.used") { 571 if (MAI->getUsedDirective() != 0) // No need to emit this at all. 572 EmitLLVMUsedList(GV->getInitializer()); 573 return true; 574 } 575 576 // Ignore debug and non-emitted data. This handles llvm.compiler.used. 577 if (GV->getSection() == "llvm.metadata" || 578 GV->hasAvailableExternallyLinkage()) 579 return true; 580 581 if (!GV->hasAppendingLinkage()) return false; 582 583 assert(GV->hasInitializer() && "Not a special LLVM global!"); 584 585 const TargetData *TD = TM.getTargetData(); 586 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 587 if (GV->getName() == "llvm.global_ctors") { 588 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection()); 589 EmitAlignment(Align, 0); 590 EmitXXStructorList(GV->getInitializer()); 591 592 if (TM.getRelocationModel() == Reloc::Static && 593 MAI->hasStaticCtorDtorReferenceInStaticMode()) 594 O << ".reference .constructors_used\n"; 595 return true; 596 } 597 598 if (GV->getName() == "llvm.global_dtors") { 599 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection()); 600 EmitAlignment(Align, 0); 601 EmitXXStructorList(GV->getInitializer()); 602 603 if (TM.getRelocationModel() == Reloc::Static && 604 MAI->hasStaticCtorDtorReferenceInStaticMode()) 605 O << ".reference .destructors_used\n"; 606 return true; 607 } 608 609 return false; 610} 611 612/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each 613/// global in the specified llvm.used list for which emitUsedDirectiveFor 614/// is true, as being used with this directive. 615void AsmPrinter::EmitLLVMUsedList(Constant *List) { 616 const char *Directive = MAI->getUsedDirective(); 617 618 // Should be an array of 'i8*'. 619 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 620 if (InitList == 0) return; 621 622 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 623 const GlobalValue *GV = 624 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts()); 625 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) { 626 O << Directive; 627 EmitConstantValueOnly(InitList->getOperand(i)); 628 O << '\n'; 629 } 630 } 631} 632 633/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 634/// function pointers, ignoring the init priority. 635void AsmPrinter::EmitXXStructorList(Constant *List) { 636 // Should be an array of '{ int, void ()* }' structs. The first value is the 637 // init priority, which we ignore. 638 if (!isa<ConstantArray>(List)) return; 639 ConstantArray *InitList = cast<ConstantArray>(List); 640 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 641 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 642 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 643 644 if (CS->getOperand(1)->isNullValue()) 645 return; // Found a null terminator, exit printing. 646 // Emit the function pointer. 647 EmitGlobalConstant(CS->getOperand(1)); 648 } 649} 650 651 652//===----------------------------------------------------------------------===// 653/// LEB 128 number encoding. 654 655/// PrintULEB128 - Print a series of hexadecimal values (separated by commas) 656/// representing an unsigned leb128 value. 657void AsmPrinter::PrintULEB128(unsigned Value) const { 658 do { 659 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 660 Value >>= 7; 661 if (Value) Byte |= 0x80; 662 PrintHex(Byte); 663 if (Value) O << ", "; 664 } while (Value); 665} 666 667/// PrintSLEB128 - Print a series of hexadecimal values (separated by commas) 668/// representing a signed leb128 value. 669void AsmPrinter::PrintSLEB128(int Value) const { 670 int Sign = Value >> (8 * sizeof(Value) - 1); 671 bool IsMore; 672 673 do { 674 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 675 Value >>= 7; 676 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; 677 if (IsMore) Byte |= 0x80; 678 PrintHex(Byte); 679 if (IsMore) O << ", "; 680 } while (IsMore); 681} 682 683//===--------------------------------------------------------------------===// 684// Emission and print routines 685// 686 687/// PrintHex - Print a value as a hexadecimal value. 688/// 689void AsmPrinter::PrintHex(uint64_t Value) const { 690 O << "0x"; 691 O.write_hex(Value); 692} 693 694/// EOL - Print a newline character to asm stream. If a comment is present 695/// then it will be printed first. Comments should not contain '\n'. 696void AsmPrinter::EOL() const { 697 O << '\n'; 698} 699 700void AsmPrinter::EOL(const Twine &Comment) const { 701 if (VerboseAsm && !Comment.isTriviallyEmpty()) { 702 O.PadToColumn(MAI->getCommentColumn()); 703 O << MAI->getCommentString() 704 << ' ' 705 << Comment; 706 } 707 O << '\n'; 708} 709 710static const char *DecodeDWARFEncoding(unsigned Encoding) { 711 switch (Encoding) { 712 case dwarf::DW_EH_PE_absptr: 713 return "absptr"; 714 case dwarf::DW_EH_PE_omit: 715 return "omit"; 716 case dwarf::DW_EH_PE_pcrel: 717 return "pcrel"; 718 case dwarf::DW_EH_PE_udata4: 719 return "udata4"; 720 case dwarf::DW_EH_PE_udata8: 721 return "udata8"; 722 case dwarf::DW_EH_PE_sdata4: 723 return "sdata4"; 724 case dwarf::DW_EH_PE_sdata8: 725 return "sdata8"; 726 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4: 727 return "pcrel udata4"; 728 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4: 729 return "pcrel sdata4"; 730 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8: 731 return "pcrel udata8"; 732 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8: 733 return "pcrel sdata8"; 734 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4: 735 return "indirect pcrel udata4"; 736 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4: 737 return "indirect pcrel sdata4"; 738 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8: 739 return "indirect pcrel udata8"; 740 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8: 741 return "indirect pcrel sdata8"; 742 } 743 744 return 0; 745} 746 747void AsmPrinter::EOL(const Twine &Comment, unsigned Encoding) const { 748 if (VerboseAsm && !Comment.isTriviallyEmpty()) { 749 O.PadToColumn(MAI->getCommentColumn()); 750 O << MAI->getCommentString() 751 << ' ' 752 << Comment; 753 754 if (const char *EncStr = DecodeDWARFEncoding(Encoding)) 755 O << " (" << EncStr << ')'; 756 } 757 O << '\n'; 758} 759 760/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an 761/// unsigned leb128 value. 762void AsmPrinter::EmitULEB128Bytes(unsigned Value) const { 763 if (MAI->hasLEB128()) { 764 O << "\t.uleb128\t" 765 << Value; 766 } else { 767 O << MAI->getData8bitsDirective(); 768 PrintULEB128(Value); 769 } 770} 771 772/// EmitSLEB128Bytes - print an assembler byte data directive to compose a 773/// signed leb128 value. 774void AsmPrinter::EmitSLEB128Bytes(int Value) const { 775 if (MAI->hasLEB128()) { 776 O << "\t.sleb128\t" 777 << Value; 778 } else { 779 O << MAI->getData8bitsDirective(); 780 PrintSLEB128(Value); 781 } 782} 783 784/// EmitInt8 - Emit a byte directive and value. 785/// 786void AsmPrinter::EmitInt8(int Value) const { 787 O << MAI->getData8bitsDirective(); 788 PrintHex(Value & 0xFF); 789} 790 791/// EmitInt16 - Emit a short directive and value. 792/// 793void AsmPrinter::EmitInt16(int Value) const { 794 O << MAI->getData16bitsDirective(); 795 PrintHex(Value & 0xFFFF); 796} 797 798/// EmitInt32 - Emit a long directive and value. 799/// 800void AsmPrinter::EmitInt32(int Value) const { 801 O << MAI->getData32bitsDirective(); 802 PrintHex(Value); 803} 804 805/// EmitInt64 - Emit a long long directive and value. 806/// 807void AsmPrinter::EmitInt64(uint64_t Value) const { 808 if (MAI->getData64bitsDirective()) { 809 O << MAI->getData64bitsDirective(); 810 PrintHex(Value); 811 } else { 812 if (TM.getTargetData()->isBigEndian()) { 813 EmitInt32(unsigned(Value >> 32)); O << '\n'; 814 EmitInt32(unsigned(Value)); 815 } else { 816 EmitInt32(unsigned(Value)); O << '\n'; 817 EmitInt32(unsigned(Value >> 32)); 818 } 819 } 820} 821 822/// toOctal - Convert the low order bits of X into an octal digit. 823/// 824static inline char toOctal(int X) { 825 return (X&7)+'0'; 826} 827 828/// printStringChar - Print a char, escaped if necessary. 829/// 830static void printStringChar(formatted_raw_ostream &O, unsigned char C) { 831 if (C == '"') { 832 O << "\\\""; 833 } else if (C == '\\') { 834 O << "\\\\"; 835 } else if (isprint((unsigned char)C)) { 836 O << C; 837 } else { 838 switch(C) { 839 case '\b': O << "\\b"; break; 840 case '\f': O << "\\f"; break; 841 case '\n': O << "\\n"; break; 842 case '\r': O << "\\r"; break; 843 case '\t': O << "\\t"; break; 844 default: 845 O << '\\'; 846 O << toOctal(C >> 6); 847 O << toOctal(C >> 3); 848 O << toOctal(C >> 0); 849 break; 850 } 851 } 852} 853 854/// EmitString - Emit a string with quotes and a null terminator. 855/// Special characters are emitted properly. 856/// \literal (Eg. '\t') \endliteral 857void AsmPrinter::EmitString(const StringRef String) const { 858 EmitString(String.data(), String.size()); 859} 860 861void AsmPrinter::EmitString(const char *String, unsigned Size) const { 862 const char* AscizDirective = MAI->getAscizDirective(); 863 if (AscizDirective) 864 O << AscizDirective; 865 else 866 O << MAI->getAsciiDirective(); 867 O << '\"'; 868 for (unsigned i = 0; i < Size; ++i) 869 printStringChar(O, String[i]); 870 if (AscizDirective) 871 O << '\"'; 872 else 873 O << "\\0\""; 874} 875 876 877/// EmitFile - Emit a .file directive. 878void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const { 879 O << "\t.file\t" << Number << " \""; 880 for (unsigned i = 0, N = Name.size(); i < N; ++i) 881 printStringChar(O, Name[i]); 882 O << '\"'; 883} 884 885 886//===----------------------------------------------------------------------===// 887 888// EmitAlignment - Emit an alignment directive to the specified power of 889// two boundary. For example, if you pass in 3 here, you will get an 8 890// byte alignment. If a global value is specified, and if that global has 891// an explicit alignment requested, it will unconditionally override the 892// alignment request. However, if ForcedAlignBits is specified, this value 893// has final say: the ultimate alignment will be the max of ForcedAlignBits 894// and the alignment computed with NumBits and the global. 895// 896// The algorithm is: 897// Align = NumBits; 898// if (GV && GV->hasalignment) Align = GV->getalignment(); 899// Align = std::max(Align, ForcedAlignBits); 900// 901void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 902 unsigned ForcedAlignBits, 903 bool UseFillExpr) const { 904 if (GV && GV->getAlignment()) 905 NumBits = Log2_32(GV->getAlignment()); 906 NumBits = std::max(NumBits, ForcedAlignBits); 907 908 if (NumBits == 0) return; // No need to emit alignment. 909 910 unsigned FillValue = 0; 911 if (getCurrentSection()->getKind().isText()) 912 FillValue = MAI->getTextAlignFillValue(); 913 914 OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0); 915} 916 917// Print out the specified constant, without a storage class. Only the 918// constants valid in constant expressions can occur here. 919void AsmPrinter::EmitConstantValueOnly(const Constant *CV) { 920 if (CV->isNullValue() || isa<UndefValue>(CV)) { 921 O << '0'; 922 return; 923 } 924 925 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 926 O << CI->getZExtValue(); 927 return; 928 } 929 930 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) { 931 // This is a constant address for a global variable or function. Use the 932 // name of the variable or function as the address value. 933 O << *GetGlobalValueSymbol(GV); 934 return; 935 } 936 937 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) { 938 O << *GetBlockAddressSymbol(BA); 939 return; 940 } 941 942 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV); 943 if (CE == 0) { 944 llvm_unreachable("Unknown constant value!"); 945 O << '0'; 946 return; 947 } 948 949 switch (CE->getOpcode()) { 950 case Instruction::ZExt: 951 case Instruction::SExt: 952 case Instruction::FPTrunc: 953 case Instruction::FPExt: 954 case Instruction::UIToFP: 955 case Instruction::SIToFP: 956 case Instruction::FPToUI: 957 case Instruction::FPToSI: 958 default: 959 llvm_unreachable("FIXME: Don't support this constant cast expr"); 960 case Instruction::GetElementPtr: { 961 // generate a symbolic expression for the byte address 962 const TargetData *TD = TM.getTargetData(); 963 const Constant *ptrVal = CE->getOperand(0); 964 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 965 int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], 966 idxVec.size()); 967 if (Offset == 0) 968 return EmitConstantValueOnly(ptrVal); 969 970 // Truncate/sext the offset to the pointer size. 971 if (TD->getPointerSizeInBits() != 64) { 972 int SExtAmount = 64-TD->getPointerSizeInBits(); 973 Offset = (Offset << SExtAmount) >> SExtAmount; 974 } 975 976 if (Offset) 977 O << '('; 978 EmitConstantValueOnly(ptrVal); 979 if (Offset > 0) 980 O << ") + " << Offset; 981 else 982 O << ") - " << -Offset; 983 return; 984 } 985 case Instruction::BitCast: 986 return EmitConstantValueOnly(CE->getOperand(0)); 987 988 case Instruction::IntToPtr: { 989 // Handle casts to pointers by changing them into casts to the appropriate 990 // integer type. This promotes constant folding and simplifies this code. 991 const TargetData *TD = TM.getTargetData(); 992 Constant *Op = CE->getOperand(0); 993 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()), 994 false/*ZExt*/); 995 return EmitConstantValueOnly(Op); 996 } 997 998 case Instruction::PtrToInt: { 999 // Support only foldable casts to/from pointers that can be eliminated by 1000 // changing the pointer to the appropriately sized integer type. 1001 Constant *Op = CE->getOperand(0); 1002 const Type *Ty = CE->getType(); 1003 const TargetData *TD = TM.getTargetData(); 1004 1005 // We can emit the pointer value into this slot if the slot is an 1006 // integer slot greater or equal to the size of the pointer. 1007 if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType())) 1008 return EmitConstantValueOnly(Op); 1009 1010 O << "(("; 1011 EmitConstantValueOnly(Op); 1012 APInt ptrMask = 1013 APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType())); 1014 1015 SmallString<40> S; 1016 ptrMask.toStringUnsigned(S); 1017 O << ") & " << S.str() << ')'; 1018 return; 1019 } 1020 1021 case Instruction::Trunc: 1022 // We emit the value and depend on the assembler to truncate the generated 1023 // expression properly. This is important for differences between 1024 // blockaddress labels. Since the two labels are in the same function, it 1025 // is reasonable to treat their delta as a 32-bit value. 1026 return EmitConstantValueOnly(CE->getOperand(0)); 1027 1028 case Instruction::Add: 1029 case Instruction::Sub: 1030 case Instruction::And: 1031 case Instruction::Or: 1032 case Instruction::Xor: 1033 O << '('; 1034 EmitConstantValueOnly(CE->getOperand(0)); 1035 O << ')'; 1036 switch (CE->getOpcode()) { 1037 case Instruction::Add: 1038 O << " + "; 1039 break; 1040 case Instruction::Sub: 1041 O << " - "; 1042 break; 1043 case Instruction::And: 1044 O << " & "; 1045 break; 1046 case Instruction::Or: 1047 O << " | "; 1048 break; 1049 case Instruction::Xor: 1050 O << " ^ "; 1051 break; 1052 default: 1053 break; 1054 } 1055 O << '('; 1056 EmitConstantValueOnly(CE->getOperand(1)); 1057 O << ')'; 1058 break; 1059 } 1060} 1061 1062/// printAsCString - Print the specified array as a C compatible string, only if 1063/// the predicate isString is true. 1064/// 1065static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA, 1066 unsigned LastElt) { 1067 assert(CVA->isString() && "Array is not string compatible!"); 1068 1069 O << '\"'; 1070 for (unsigned i = 0; i != LastElt; ++i) { 1071 unsigned char C = 1072 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue(); 1073 printStringChar(O, C); 1074 } 1075 O << '\"'; 1076} 1077 1078/// EmitString - Emit a zero-byte-terminated string constant. 1079/// 1080void AsmPrinter::EmitString(const ConstantArray *CVA) const { 1081 unsigned NumElts = CVA->getNumOperands(); 1082 if (MAI->getAscizDirective() && NumElts && 1083 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) { 1084 O << MAI->getAscizDirective(); 1085 printAsCString(O, CVA, NumElts-1); 1086 } else { 1087 O << MAI->getAsciiDirective(); 1088 printAsCString(O, CVA, NumElts); 1089 } 1090 O << '\n'; 1091} 1092 1093static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace, 1094 AsmPrinter &AP) { 1095 if (AddrSpace == 0 && CA->isString()) { 1096 AP.EmitString(CA); 1097 } else { // Not a string. Print the values in successive locations 1098 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) 1099 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace); 1100 } 1101} 1102 1103static void EmitGlobalConstantVector(const ConstantVector *CV, 1104 unsigned AddrSpace, AsmPrinter &AP) { 1105 const VectorType *VTy = CV->getType(); 1106 for (unsigned i = 0, e = VTy->getNumElements(); i != e; ++i) 1107 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace); 1108} 1109 1110static void EmitGlobalConstantStruct(const ConstantStruct *CS, 1111 unsigned AddrSpace, AsmPrinter &AP) { 1112 // Print the fields in successive locations. Pad to align if needed! 1113 const TargetData *TD = AP.TM.getTargetData(); 1114 unsigned Size = TD->getTypeAllocSize(CS->getType()); 1115 const StructLayout *cvsLayout = TD->getStructLayout(CS->getType()); 1116 uint64_t SizeSoFar = 0; 1117 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) { 1118 const Constant *field = CS->getOperand(i); 1119 1120 // Check if padding is needed and insert one or more 0s. 1121 uint64_t fieldSize = TD->getTypeAllocSize(field->getType()); 1122 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1)) 1123 - cvsLayout->getElementOffset(i)) - fieldSize; 1124 SizeSoFar += fieldSize + padSize; 1125 1126 // Now print the actual field value. 1127 AP.EmitGlobalConstant(field, AddrSpace); 1128 1129 // Insert padding - this may include padding to increase the size of the 1130 // current field up to the ABI size (if the struct is not packed) as well 1131 // as padding to ensure that the next field starts at the right offset. 1132 AP.OutStreamer.EmitZeros(padSize, AddrSpace); 1133 } 1134 assert(SizeSoFar == cvsLayout->getSizeInBytes() && 1135 "Layout of constant struct may be incorrect!"); 1136} 1137 1138void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP, 1139 unsigned AddrSpace) { 1140 // FP Constants are printed as integer constants to avoid losing 1141 // precision... 1142 const TargetData &TD = *TM.getTargetData(); 1143 if (CFP->getType()->isDoubleTy()) { 1144 if (VerboseAsm) { 1145 double Val = CFP->getValueAPF().convertToDouble(); // for comment only 1146 O.PadToColumn(MAI->getCommentColumn()); 1147 O << MAI->getCommentString() << " double " << Val << '\n'; 1148 } 1149 1150 uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1151 if (MAI->getData64bitsDirective(AddrSpace)) { 1152 O << MAI->getData64bitsDirective(AddrSpace) << i << '\n'; 1153 } else if (TD.isBigEndian()) { 1154 O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32) << '\n'; 1155 O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i) << '\n'; 1156 } else { 1157 O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i) << '\n'; 1158 O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32) << '\n'; 1159 } 1160 return; 1161 } 1162 1163 if (CFP->getType()->isFloatTy()) { 1164 if (VerboseAsm) { 1165 float Val = CFP->getValueAPF().convertToFloat(); // for comment only 1166 O.PadToColumn(MAI->getCommentColumn()); 1167 O << MAI->getCommentString() << " float " << Val << '\n'; 1168 } 1169 O << MAI->getData32bitsDirective(AddrSpace) 1170 << CFP->getValueAPF().bitcastToAPInt().getZExtValue() << '\n'; 1171 return; 1172 } 1173 1174 if (CFP->getType()->isX86_FP80Ty()) { 1175 // all long double variants are printed as hex 1176 // api needed to prevent premature destruction 1177 APInt API = CFP->getValueAPF().bitcastToAPInt(); 1178 const uint64_t *p = API.getRawData(); 1179 if (VerboseAsm) { 1180 // Convert to double so we can print the approximate val as a comment. 1181 APFloat DoubleVal = CFP->getValueAPF(); 1182 bool ignored; 1183 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 1184 &ignored); 1185 O.PadToColumn(MAI->getCommentColumn()); 1186 O << MAI->getCommentString() << " x86_fp80 ~= " 1187 << DoubleVal.convertToDouble() << '\n'; 1188 } 1189 1190 if (TD.isBigEndian()) { 1191 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]) << '\n'; 1192 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48)<<'\n'; 1193 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32)<<'\n'; 1194 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16)<<'\n'; 1195 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]) <<'\n'; 1196 } else { 1197 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]) << '\n'; 1198 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16)<<'\n'; 1199 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32)<<'\n'; 1200 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48)<<'\n'; 1201 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]) << '\n'; 1202 } 1203 OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) - 1204 TD.getTypeStoreSize(CFP->getType()), AddrSpace); 1205 return; 1206 } 1207 1208 assert(CFP->getType()->isPPC_FP128Ty() && 1209 "Floating point constant type not handled"); 1210 // All long double variants are printed as hex api needed to prevent 1211 // premature destruction. 1212 APInt API = CFP->getValueAPF().bitcastToAPInt(); 1213 const uint64_t *p = API.getRawData(); 1214 if (TD.isBigEndian()) { 1215 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32)<<'\n'; 1216 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0])<<'\n'; 1217 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32)<<'\n'; 1218 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1])<<'\n'; 1219 } else { 1220 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1])<<'\n'; 1221 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32)<<'\n'; 1222 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0])<<'\n'; 1223 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32)<<'\n'; 1224 } 1225} 1226 1227void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI, 1228 unsigned AddrSpace) { 1229 const TargetData *TD = TM.getTargetData(); 1230 unsigned BitWidth = CI->getBitWidth(); 1231 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits"); 1232 1233 // We don't expect assemblers to support integer data directives 1234 // for more than 64 bits, so we emit the data in at most 64-bit 1235 // quantities at a time. 1236 const uint64_t *RawData = CI->getValue().getRawData(); 1237 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1238 uint64_t Val; 1239 if (TD->isBigEndian()) 1240 Val = RawData[e - i - 1]; 1241 else 1242 Val = RawData[i]; 1243 1244 if (MAI->getData64bitsDirective(AddrSpace)) { 1245 O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n'; 1246 continue; 1247 } 1248 1249 // Emit two 32-bit chunks, order depends on endianness. 1250 unsigned FirstChunk = unsigned(Val), SecondChunk = unsigned(Val >> 32); 1251 const char *FirstName = " least", *SecondName = " most"; 1252 if (TD->isBigEndian()) { 1253 std::swap(FirstChunk, SecondChunk); 1254 std::swap(FirstName, SecondName); 1255 } 1256 1257 O << MAI->getData32bitsDirective(AddrSpace) << FirstChunk; 1258 if (VerboseAsm) { 1259 O.PadToColumn(MAI->getCommentColumn()); 1260 O << MAI->getCommentString() 1261 << FirstName << " significant half of i64 " << Val; 1262 } 1263 O << '\n'; 1264 1265 O << MAI->getData32bitsDirective(AddrSpace) << SecondChunk; 1266 if (VerboseAsm) { 1267 O.PadToColumn(MAI->getCommentColumn()); 1268 O << MAI->getCommentString() 1269 << SecondName << " significant half of i64 " << Val; 1270 } 1271 O << '\n'; 1272 } 1273} 1274 1275/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 1276void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { 1277 const TargetData *TD = TM.getTargetData(); 1278 const Type *type = CV->getType(); 1279 unsigned Size = TD->getTypeAllocSize(type); 1280 1281 if (CV->isNullValue() || isa<UndefValue>(CV)) 1282 return OutStreamer.EmitZeros(Size, AddrSpace); 1283 1284 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) 1285 return EmitGlobalConstantArray(CVA, AddrSpace, *this); 1286 1287 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) 1288 return EmitGlobalConstantStruct(CVS, AddrSpace, *this); 1289 1290 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) 1291 return EmitGlobalConstantFP(CFP, AddrSpace); 1292 1293 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1294 // If we can directly emit an 8-byte constant, do it. 1295 if (Size == 8) 1296 if (const char *Data64Dir = MAI->getData64bitsDirective(AddrSpace)) { 1297 O << Data64Dir << CI->getZExtValue() << '\n'; 1298 return; 1299 } 1300 1301 // Small integers are handled below; large integers are handled here. 1302 if (Size > 4) { 1303 EmitGlobalConstantLargeInt(CI, AddrSpace); 1304 return; 1305 } 1306 } 1307 1308 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV)) 1309 return EmitGlobalConstantVector(V, AddrSpace, *this); 1310 1311 printDataDirective(type, AddrSpace); 1312 EmitConstantValueOnly(CV); 1313 if (VerboseAsm) { 1314 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1315 SmallString<40> S; 1316 CI->getValue().toStringUnsigned(S, 16); 1317 O.PadToColumn(MAI->getCommentColumn()); 1318 O << MAI->getCommentString() << " 0x" << S.str(); 1319 } 1320 } 1321 O << '\n'; 1322} 1323 1324void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1325 // Target doesn't support this yet! 1326 llvm_unreachable("Target does not support EmitMachineConstantPoolValue"); 1327} 1328 1329/// PrintSpecial - Print information related to the specified machine instr 1330/// that is independent of the operand, and may be independent of the instr 1331/// itself. This can be useful for portably encoding the comment character 1332/// or other bits of target-specific knowledge into the asmstrings. The 1333/// syntax used is ${:comment}. Targets can override this to add support 1334/// for their own strange codes. 1335void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const { 1336 if (!strcmp(Code, "private")) { 1337 O << MAI->getPrivateGlobalPrefix(); 1338 } else if (!strcmp(Code, "comment")) { 1339 if (VerboseAsm) 1340 O << MAI->getCommentString(); 1341 } else if (!strcmp(Code, "uid")) { 1342 // Comparing the address of MI isn't sufficient, because machineinstrs may 1343 // be allocated to the same address across functions. 1344 const Function *ThisF = MI->getParent()->getParent()->getFunction(); 1345 1346 // If this is a new LastFn instruction, bump the counter. 1347 if (LastMI != MI || LastFn != ThisF) { 1348 ++Counter; 1349 LastMI = MI; 1350 LastFn = ThisF; 1351 } 1352 O << Counter; 1353 } else { 1354 std::string msg; 1355 raw_string_ostream Msg(msg); 1356 Msg << "Unknown special formatter '" << Code 1357 << "' for machine instr: " << *MI; 1358 llvm_report_error(Msg.str()); 1359 } 1360} 1361 1362/// processDebugLoc - Processes the debug information of each machine 1363/// instruction's DebugLoc. 1364void AsmPrinter::processDebugLoc(const MachineInstr *MI, 1365 bool BeforePrintingInsn) { 1366 if (!MAI || !DW || !MAI->doesSupportDebugInformation() 1367 || !DW->ShouldEmitDwarfDebug()) 1368 return; 1369 DebugLoc DL = MI->getDebugLoc(); 1370 if (DL.isUnknown()) 1371 return; 1372 DILocation CurDLT = MF->getDILocation(DL); 1373 if (CurDLT.getScope().isNull()) 1374 return; 1375 1376 if (BeforePrintingInsn) { 1377 if (CurDLT.getNode() != PrevDLT) { 1378 unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(), 1379 CurDLT.getColumnNumber(), 1380 CurDLT.getScope().getNode()); 1381 printLabel(L); 1382 O << '\n'; 1383 DW->BeginScope(MI, L); 1384 PrevDLT = CurDLT.getNode(); 1385 } 1386 } else { 1387 // After printing instruction 1388 DW->EndScope(MI); 1389 } 1390} 1391 1392 1393/// printInlineAsm - This method formats and prints the specified machine 1394/// instruction that is an inline asm. 1395void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { 1396 unsigned NumOperands = MI->getNumOperands(); 1397 1398 // Count the number of register definitions. 1399 unsigned NumDefs = 0; 1400 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef(); 1401 ++NumDefs) 1402 assert(NumDefs != NumOperands-1 && "No asm string?"); 1403 1404 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?"); 1405 1406 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. 1407 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); 1408 1409 O << '\t'; 1410 1411 // If this asmstr is empty, just print the #APP/#NOAPP markers. 1412 // These are useful to see where empty asm's wound up. 1413 if (AsmStr[0] == 0) { 1414 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1415 O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n'; 1416 return; 1417 } 1418 1419 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1420 1421 // The variant of the current asmprinter. 1422 int AsmPrinterVariant = MAI->getAssemblerDialect(); 1423 1424 int CurVariant = -1; // The number of the {.|.|.} region we are in. 1425 const char *LastEmitted = AsmStr; // One past the last character emitted. 1426 1427 while (*LastEmitted) { 1428 switch (*LastEmitted) { 1429 default: { 1430 // Not a special case, emit the string section literally. 1431 const char *LiteralEnd = LastEmitted+1; 1432 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && 1433 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') 1434 ++LiteralEnd; 1435 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1436 O.write(LastEmitted, LiteralEnd-LastEmitted); 1437 LastEmitted = LiteralEnd; 1438 break; 1439 } 1440 case '\n': 1441 ++LastEmitted; // Consume newline character. 1442 O << '\n'; // Indent code with newline. 1443 break; 1444 case '$': { 1445 ++LastEmitted; // Consume '$' character. 1446 bool Done = true; 1447 1448 // Handle escapes. 1449 switch (*LastEmitted) { 1450 default: Done = false; break; 1451 case '$': // $$ -> $ 1452 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1453 O << '$'; 1454 ++LastEmitted; // Consume second '$' character. 1455 break; 1456 case '(': // $( -> same as GCC's { character. 1457 ++LastEmitted; // Consume '(' character. 1458 if (CurVariant != -1) { 1459 llvm_report_error("Nested variants found in inline asm string: '" 1460 + std::string(AsmStr) + "'"); 1461 } 1462 CurVariant = 0; // We're in the first variant now. 1463 break; 1464 case '|': 1465 ++LastEmitted; // consume '|' character. 1466 if (CurVariant == -1) 1467 O << '|'; // this is gcc's behavior for | outside a variant 1468 else 1469 ++CurVariant; // We're in the next variant. 1470 break; 1471 case ')': // $) -> same as GCC's } char. 1472 ++LastEmitted; // consume ')' character. 1473 if (CurVariant == -1) 1474 O << '}'; // this is gcc's behavior for } outside a variant 1475 else 1476 CurVariant = -1; 1477 break; 1478 } 1479 if (Done) break; 1480 1481 bool HasCurlyBraces = false; 1482 if (*LastEmitted == '{') { // ${variable} 1483 ++LastEmitted; // Consume '{' character. 1484 HasCurlyBraces = true; 1485 } 1486 1487 // If we have ${:foo}, then this is not a real operand reference, it is a 1488 // "magic" string reference, just like in .td files. Arrange to call 1489 // PrintSpecial. 1490 if (HasCurlyBraces && *LastEmitted == ':') { 1491 ++LastEmitted; 1492 const char *StrStart = LastEmitted; 1493 const char *StrEnd = strchr(StrStart, '}'); 1494 if (StrEnd == 0) { 1495 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '" 1496 + std::string(AsmStr) + "'"); 1497 } 1498 1499 std::string Val(StrStart, StrEnd); 1500 PrintSpecial(MI, Val.c_str()); 1501 LastEmitted = StrEnd+1; 1502 break; 1503 } 1504 1505 const char *IDStart = LastEmitted; 1506 char *IDEnd; 1507 errno = 0; 1508 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. 1509 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { 1510 llvm_report_error("Bad $ operand number in inline asm string: '" 1511 + std::string(AsmStr) + "'"); 1512 } 1513 LastEmitted = IDEnd; 1514 1515 char Modifier[2] = { 0, 0 }; 1516 1517 if (HasCurlyBraces) { 1518 // If we have curly braces, check for a modifier character. This 1519 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. 1520 if (*LastEmitted == ':') { 1521 ++LastEmitted; // Consume ':' character. 1522 if (*LastEmitted == 0) { 1523 llvm_report_error("Bad ${:} expression in inline asm string: '" 1524 + std::string(AsmStr) + "'"); 1525 } 1526 1527 Modifier[0] = *LastEmitted; 1528 ++LastEmitted; // Consume modifier character. 1529 } 1530 1531 if (*LastEmitted != '}') { 1532 llvm_report_error("Bad ${} expression in inline asm string: '" 1533 + std::string(AsmStr) + "'"); 1534 } 1535 ++LastEmitted; // Consume '}' character. 1536 } 1537 1538 if ((unsigned)Val >= NumOperands-1) { 1539 llvm_report_error("Invalid $ operand number in inline asm string: '" 1540 + std::string(AsmStr) + "'"); 1541 } 1542 1543 // Okay, we finally have a value number. Ask the target to print this 1544 // operand! 1545 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { 1546 unsigned OpNo = 1; 1547 1548 bool Error = false; 1549 1550 // Scan to find the machine operand number for the operand. 1551 for (; Val; --Val) { 1552 if (OpNo >= MI->getNumOperands()) break; 1553 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1554 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1; 1555 } 1556 1557 if (OpNo >= MI->getNumOperands()) { 1558 Error = true; 1559 } else { 1560 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1561 ++OpNo; // Skip over the ID number. 1562 1563 if (Modifier[0] == 'l') // labels are target independent 1564 O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber()); 1565 else { 1566 AsmPrinter *AP = const_cast<AsmPrinter*>(this); 1567 if ((OpFlags & 7) == 4) { 1568 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, 1569 Modifier[0] ? Modifier : 0); 1570 } else { 1571 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, 1572 Modifier[0] ? Modifier : 0); 1573 } 1574 } 1575 } 1576 if (Error) { 1577 std::string msg; 1578 raw_string_ostream Msg(msg); 1579 Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n"; 1580 MI->print(Msg); 1581 llvm_report_error(Msg.str()); 1582 } 1583 } 1584 break; 1585 } 1586 } 1587 } 1588 O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd(); 1589} 1590 1591/// printImplicitDef - This method prints the specified machine instruction 1592/// that is an implicit def. 1593void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { 1594 if (!VerboseAsm) return; 1595 O.PadToColumn(MAI->getCommentColumn()); 1596 O << MAI->getCommentString() << " implicit-def: " 1597 << TRI->getName(MI->getOperand(0).getReg()); 1598} 1599 1600void AsmPrinter::printKill(const MachineInstr *MI) const { 1601 if (!VerboseAsm) return; 1602 O.PadToColumn(MAI->getCommentColumn()); 1603 O << MAI->getCommentString() << " kill:"; 1604 for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) { 1605 const MachineOperand &op = MI->getOperand(n); 1606 assert(op.isReg() && "KILL instruction must have only register operands"); 1607 O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>"); 1608 } 1609} 1610 1611/// printLabel - This method prints a local label used by debug and 1612/// exception handling tables. 1613void AsmPrinter::printLabel(const MachineInstr *MI) const { 1614 printLabel(MI->getOperand(0).getImm()); 1615} 1616 1617void AsmPrinter::printLabel(unsigned Id) const { 1618 O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':'; 1619} 1620 1621/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 1622/// instruction, using the specified assembler variant. Targets should 1623/// override this to format as appropriate. 1624bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 1625 unsigned AsmVariant, const char *ExtraCode) { 1626 // Target doesn't support this yet! 1627 return true; 1628} 1629 1630bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 1631 unsigned AsmVariant, 1632 const char *ExtraCode) { 1633 // Target doesn't support this yet! 1634 return true; 1635} 1636 1637MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA, 1638 const char *Suffix) const { 1639 return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix); 1640} 1641 1642MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F, 1643 const BasicBlock *BB, 1644 const char *Suffix) const { 1645 assert(BB->hasName() && 1646 "Address of anonymous basic block not supported yet!"); 1647 1648 // This code must use the function name itself, and not the function number, 1649 // since it must be possible to generate the label name from within other 1650 // functions. 1651 SmallString<60> FnName; 1652 Mang->getNameWithPrefix(FnName, F, false); 1653 1654 // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME! 1655 SmallString<60> NameResult; 1656 Mang->getNameWithPrefix(NameResult, 1657 StringRef("BA") + Twine((unsigned)FnName.size()) + 1658 "_" + FnName.str() + "_" + BB->getName() + Suffix, 1659 Mangler::Private); 1660 1661 return OutContext.GetOrCreateSymbol(NameResult.str()); 1662} 1663 1664MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const { 1665 SmallString<60> Name; 1666 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB" 1667 << getFunctionNumber() << '_' << MBBID; 1668 1669 return OutContext.GetOrCreateSymbol(Name.str()); 1670} 1671 1672/// GetGlobalValueSymbol - Return the MCSymbol for the specified global 1673/// value. 1674MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const { 1675 SmallString<60> NameStr; 1676 Mang->getNameWithPrefix(NameStr, GV, false); 1677 return OutContext.GetOrCreateSymbol(NameStr.str()); 1678} 1679 1680/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with 1681/// global value name as its base, with the specified suffix, and where the 1682/// symbol is forced to have private linkage if ForcePrivate is true. 1683MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV, 1684 StringRef Suffix, 1685 bool ForcePrivate) const { 1686 SmallString<60> NameStr; 1687 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate); 1688 NameStr.append(Suffix.begin(), Suffix.end()); 1689 return OutContext.GetOrCreateSymbol(NameStr.str()); 1690} 1691 1692/// GetExternalSymbolSymbol - Return the MCSymbol for the specified 1693/// ExternalSymbol. 1694MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const { 1695 SmallString<60> NameStr; 1696 Mang->getNameWithPrefix(NameStr, Sym); 1697 return OutContext.GetOrCreateSymbol(NameStr.str()); 1698} 1699 1700 1701/// EmitBasicBlockStart - This method prints the label for the specified 1702/// MachineBasicBlock, an alignment (if present) and a comment describing 1703/// it if appropriate. 1704void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { 1705 // Emit an alignment directive for this block, if needed. 1706 if (unsigned Align = MBB->getAlignment()) 1707 EmitAlignment(Log2_32(Align)); 1708 1709 // If the block has its address taken, emit a special label to satisfy 1710 // references to the block. This is done so that we don't need to 1711 // remember the number of this label, and so that we can make 1712 // forward references to labels without knowing what their numbers 1713 // will be. 1714 if (MBB->hasAddressTaken()) { 1715 O << *GetBlockAddressSymbol(MBB->getBasicBlock()->getParent(), 1716 MBB->getBasicBlock()); 1717 O << ':'; 1718 if (VerboseAsm) { 1719 O.PadToColumn(MAI->getCommentColumn()); 1720 O << MAI->getCommentString() << " Address Taken"; 1721 } 1722 O << '\n'; 1723 } 1724 1725 // Print the main label for the block. 1726 if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) { 1727 if (VerboseAsm) 1728 O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':'; 1729 } else { 1730 O << *GetMBBSymbol(MBB->getNumber()) << ':'; 1731 if (!VerboseAsm) 1732 O << '\n'; 1733 } 1734 1735 // Print some comments to accompany the label. 1736 if (VerboseAsm) { 1737 if (const BasicBlock *BB = MBB->getBasicBlock()) 1738 if (BB->hasName()) { 1739 O.PadToColumn(MAI->getCommentColumn()); 1740 O << MAI->getCommentString() << ' '; 1741 WriteAsOperand(O, BB, /*PrintType=*/false); 1742 } 1743 1744 EmitComments(*MBB); 1745 O << '\n'; 1746 } 1747} 1748 1749/// printPICJumpTableSetLabel - This method prints a set label for the 1750/// specified MachineBasicBlock for a jumptable entry. 1751void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, 1752 const MachineBasicBlock *MBB) const { 1753 if (!MAI->getSetDirective()) 1754 return; 1755 1756 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix() 1757 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',' 1758 << *GetMBBSymbol(MBB->getNumber()) 1759 << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1760 << '_' << uid << '\n'; 1761} 1762 1763void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2, 1764 const MachineBasicBlock *MBB) const { 1765 if (!MAI->getSetDirective()) 1766 return; 1767 1768 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix() 1769 << getFunctionNumber() << '_' << uid << '_' << uid2 1770 << "_set_" << MBB->getNumber() << ',' 1771 << *GetMBBSymbol(MBB->getNumber()) 1772 << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1773 << '_' << uid << '_' << uid2 << '\n'; 1774} 1775 1776/// printDataDirective - This method prints the asm directive for the 1777/// specified type. 1778void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) { 1779 const TargetData *TD = TM.getTargetData(); 1780 switch (type->getTypeID()) { 1781 case Type::FloatTyID: case Type::DoubleTyID: 1782 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID: 1783 assert(0 && "Should have already output floating point constant."); 1784 default: 1785 assert(0 && "Can't handle printing this type of thing"); 1786 case Type::IntegerTyID: { 1787 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth(); 1788 if (BitWidth <= 8) 1789 O << MAI->getData8bitsDirective(AddrSpace); 1790 else if (BitWidth <= 16) 1791 O << MAI->getData16bitsDirective(AddrSpace); 1792 else if (BitWidth <= 32) 1793 O << MAI->getData32bitsDirective(AddrSpace); 1794 else if (BitWidth <= 64) { 1795 assert(MAI->getData64bitsDirective(AddrSpace) && 1796 "Target cannot handle 64-bit constant exprs!"); 1797 O << MAI->getData64bitsDirective(AddrSpace); 1798 } else { 1799 llvm_unreachable("Target cannot handle given data directive width!"); 1800 } 1801 break; 1802 } 1803 case Type::PointerTyID: 1804 if (TD->getPointerSize() == 8) { 1805 assert(MAI->getData64bitsDirective(AddrSpace) && 1806 "Target cannot handle 64-bit pointer exprs!"); 1807 O << MAI->getData64bitsDirective(AddrSpace); 1808 } else if (TD->getPointerSize() == 2) { 1809 O << MAI->getData16bitsDirective(AddrSpace); 1810 } else if (TD->getPointerSize() == 1) { 1811 O << MAI->getData8bitsDirective(AddrSpace); 1812 } else { 1813 O << MAI->getData32bitsDirective(AddrSpace); 1814 } 1815 break; 1816 } 1817} 1818 1819void AsmPrinter::printVisibility(const MCSymbol *Sym, 1820 unsigned Visibility) const { 1821 if (Visibility == GlobalValue::HiddenVisibility) { 1822 if (const char *Directive = MAI->getHiddenDirective()) 1823 O << Directive << *Sym << '\n'; 1824 } else if (Visibility == GlobalValue::ProtectedVisibility) { 1825 if (const char *Directive = MAI->getProtectedDirective()) 1826 O << Directive << *Sym << '\n'; 1827 } 1828} 1829 1830void AsmPrinter::printOffset(int64_t Offset) const { 1831 if (Offset > 0) 1832 O << '+' << Offset; 1833 else if (Offset < 0) 1834 O << Offset; 1835} 1836 1837GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1838 if (!S->usesMetadata()) 1839 return 0; 1840 1841 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1842 if (GCPI != GCMetadataPrinters.end()) 1843 return GCPI->second; 1844 1845 const char *Name = S->getName().c_str(); 1846 1847 for (GCMetadataPrinterRegistry::iterator 1848 I = GCMetadataPrinterRegistry::begin(), 1849 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1850 if (strcmp(Name, I->getName()) == 0) { 1851 GCMetadataPrinter *GMP = I->instantiate(); 1852 GMP->S = S; 1853 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1854 return GMP; 1855 } 1856 1857 errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n"; 1858 llvm_unreachable(0); 1859} 1860 1861/// EmitComments - Pretty-print comments for instructions 1862void AsmPrinter::EmitComments(const MachineInstr &MI) const { 1863 if (!VerboseAsm) 1864 return; 1865 1866 bool Newline = false; 1867 1868 if (!MI.getDebugLoc().isUnknown()) { 1869 DILocation DLT = MF->getDILocation(MI.getDebugLoc()); 1870 1871 // Print source line info. 1872 O.PadToColumn(MAI->getCommentColumn()); 1873 O << MAI->getCommentString() << ' '; 1874 DIScope Scope = DLT.getScope(); 1875 // Omit the directory, because it's likely to be long and uninteresting. 1876 if (!Scope.isNull()) 1877 O << Scope.getFilename(); 1878 else 1879 O << "<unknown>"; 1880 O << ':' << DLT.getLineNumber(); 1881 if (DLT.getColumnNumber() != 0) 1882 O << ':' << DLT.getColumnNumber(); 1883 Newline = true; 1884 } 1885 1886 // Check for spills and reloads 1887 int FI; 1888 1889 const MachineFrameInfo *FrameInfo = 1890 MI.getParent()->getParent()->getFrameInfo(); 1891 1892 // We assume a single instruction only has a spill or reload, not 1893 // both. 1894 const MachineMemOperand *MMO; 1895 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) { 1896 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1897 MMO = *MI.memoperands_begin(); 1898 if (Newline) O << '\n'; 1899 O.PadToColumn(MAI->getCommentColumn()); 1900 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload"; 1901 Newline = true; 1902 } 1903 } 1904 else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) { 1905 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1906 if (Newline) O << '\n'; 1907 O.PadToColumn(MAI->getCommentColumn()); 1908 O << MAI->getCommentString() << ' ' 1909 << MMO->getSize() << "-byte Folded Reload"; 1910 Newline = true; 1911 } 1912 } 1913 else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) { 1914 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1915 MMO = *MI.memoperands_begin(); 1916 if (Newline) O << '\n'; 1917 O.PadToColumn(MAI->getCommentColumn()); 1918 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill"; 1919 Newline = true; 1920 } 1921 } 1922 else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) { 1923 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1924 if (Newline) O << '\n'; 1925 O.PadToColumn(MAI->getCommentColumn()); 1926 O << MAI->getCommentString() << ' ' 1927 << MMO->getSize() << "-byte Folded Spill"; 1928 Newline = true; 1929 } 1930 } 1931 1932 // Check for spill-induced copies 1933 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx; 1934 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg, 1935 SrcSubIdx, DstSubIdx)) { 1936 if (MI.getAsmPrinterFlag(ReloadReuse)) { 1937 if (Newline) O << '\n'; 1938 O.PadToColumn(MAI->getCommentColumn()); 1939 O << MAI->getCommentString() << " Reload Reuse"; 1940 } 1941 } 1942} 1943 1944/// PrintChildLoopComment - Print comments about child loops within 1945/// the loop for this basic block, with nesting. 1946/// 1947static void PrintChildLoopComment(formatted_raw_ostream &O, 1948 const MachineLoop *loop, 1949 const MCAsmInfo *MAI, 1950 int FunctionNumber) { 1951 // Add child loop information 1952 for(MachineLoop::iterator cl = loop->begin(), 1953 clend = loop->end(); 1954 cl != clend; 1955 ++cl) { 1956 MachineBasicBlock *Header = (*cl)->getHeader(); 1957 assert(Header && "No header for loop"); 1958 1959 O << '\n'; 1960 O.PadToColumn(MAI->getCommentColumn()); 1961 1962 O << MAI->getCommentString(); 1963 O.indent(((*cl)->getLoopDepth()-1)*2) 1964 << " Child Loop BB" << FunctionNumber << "_" 1965 << Header->getNumber() << " Depth " << (*cl)->getLoopDepth(); 1966 1967 PrintChildLoopComment(O, *cl, MAI, FunctionNumber); 1968 } 1969} 1970 1971/// EmitComments - Pretty-print comments for basic blocks 1972void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const { 1973 if (VerboseAsm) { 1974 // Add loop depth information 1975 const MachineLoop *loop = LI->getLoopFor(&MBB); 1976 1977 if (loop) { 1978 // Print a newline after bb# annotation. 1979 O << "\n"; 1980 O.PadToColumn(MAI->getCommentColumn()); 1981 O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth() 1982 << '\n'; 1983 1984 O.PadToColumn(MAI->getCommentColumn()); 1985 1986 MachineBasicBlock *Header = loop->getHeader(); 1987 assert(Header && "No header for loop"); 1988 1989 if (Header == &MBB) { 1990 O << MAI->getCommentString() << " Loop Header"; 1991 PrintChildLoopComment(O, loop, MAI, getFunctionNumber()); 1992 } 1993 else { 1994 O << MAI->getCommentString() << " Loop Header is BB" 1995 << getFunctionNumber() << "_" << loop->getHeader()->getNumber(); 1996 } 1997 1998 if (loop->empty()) { 1999 O << '\n'; 2000 O.PadToColumn(MAI->getCommentColumn()); 2001 O << MAI->getCommentString() << " Inner Loop"; 2002 } 2003 2004 // Add parent loop information 2005 for (const MachineLoop *CurLoop = loop->getParentLoop(); 2006 CurLoop; 2007 CurLoop = CurLoop->getParentLoop()) { 2008 MachineBasicBlock *Header = CurLoop->getHeader(); 2009 assert(Header && "No header for loop"); 2010 2011 O << '\n'; 2012 O.PadToColumn(MAI->getCommentColumn()); 2013 O << MAI->getCommentString(); 2014 O.indent((CurLoop->getLoopDepth()-1)*2) 2015 << " Inside Loop BB" << getFunctionNumber() << "_" 2016 << Header->getNumber() << " Depth " << CurLoop->getLoopDepth(); 2017 } 2018 } 2019 } 2020} 2021