AsmPrinter.cpp revision 042945f696010411918fb35b82cf4016da80ae18
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/GCMetadataPrinter.h" 20#include "llvm/CodeGen/MachineConstantPool.h" 21#include "llvm/CodeGen/MachineFrameInfo.h" 22#include "llvm/CodeGen/MachineFunction.h" 23#include "llvm/CodeGen/MachineJumpTableInfo.h" 24#include "llvm/CodeGen/MachineLoopInfo.h" 25#include "llvm/CodeGen/MachineModuleInfo.h" 26#include "llvm/CodeGen/DwarfWriter.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/Support/Mangler.h" 37#include "llvm/MC/MCAsmInfo.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 "llvm/ADT/StringExtras.h" 47#include <cerrno> 48using namespace llvm; 49 50static cl::opt<cl::boolOrDefault> 51AsmVerbose("asm-verbose", cl::desc("Add comments to directives."), 52 cl::init(cl::BOU_UNSET)); 53 54char AsmPrinter::ID = 0; 55AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm, 56 const MCAsmInfo *T, bool VDef) 57 : MachineFunctionPass(&ID), FunctionNumber(0), O(o), 58 TM(tm), MAI(T), TRI(tm.getRegisterInfo()), 59 60 OutContext(*new MCContext()), 61 // FIXME: Pass instprinter to streamer. 62 OutStreamer(*createAsmStreamer(OutContext, O, *T, 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(M, MAI->getGlobalPrefix(), MAI->getPrivateGlobalPrefix(), 106 MAI->getLinkerPrivateGlobalPrefix()); 107 108 if (MAI->doesAllowQuotesInName()) 109 Mang->setUseQuotes(true); 110 111 if (MAI->doesAllowNameToStartWithDigit()) 112 Mang->setSymbolsCanStartWithDigit(true); 113 114 // Allow the target to emit any magic that it wants at the start of the file. 115 EmitStartOfAsmFile(M); 116 117 if (MAI->hasSingleParameterDotFile()) { 118 /* Very minimal debug info. It is ignored if we emit actual 119 debug info. If we don't, this at least helps the user find where 120 a function came from. */ 121 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n"; 122 } 123 124 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 125 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 126 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 127 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 128 MP->beginAssembly(O, *this, *MAI); 129 130 if (!M.getModuleInlineAsm().empty()) 131 O << MAI->getCommentString() << " Start of file scope inline assembly\n" 132 << M.getModuleInlineAsm() 133 << '\n' << MAI->getCommentString() 134 << " End of file scope inline assembly\n"; 135 136 MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 137 if (MMI) 138 MMI->AnalyzeModule(M); 139 DW = getAnalysisIfAvailable<DwarfWriter>(); 140 if (DW) 141 DW->BeginModule(&M, MMI, O, this, MAI); 142 143 return false; 144} 145 146bool AsmPrinter::doFinalization(Module &M) { 147 // Emit global variables. 148 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 149 I != E; ++I) 150 PrintGlobalVariable(I); 151 152 // Emit final debug information. 153 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling()) 154 DW->EndModule(); 155 156 // If the target wants to know about weak references, print them all. 157 if (MAI->getWeakRefDirective()) { 158 // FIXME: This is not lazy, it would be nice to only print weak references 159 // to stuff that is actually used. Note that doing so would require targets 160 // to notice uses in operands (due to constant exprs etc). This should 161 // happen with the MC stuff eventually. 162 163 // Print out module-level global variables here. 164 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 165 I != E; ++I) { 166 if (I->hasExternalWeakLinkage()) 167 O << MAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n'; 168 } 169 170 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) { 171 if (I->hasExternalWeakLinkage()) 172 O << MAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n'; 173 } 174 } 175 176 if (MAI->getSetDirective()) { 177 O << '\n'; 178 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 179 I != E; ++I) { 180 MCSymbol *Name = GetGlobalValueSymbol(I); 181 182 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 183 MCSymbol *Target = GetGlobalValueSymbol(GV); 184 185 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective()) { 186 O << "\t.globl\t"; 187 Name->print(O, MAI); 188 O << '\n'; 189 } else if (I->hasWeakLinkage()) { 190 O << MAI->getWeakRefDirective(); 191 Name->print(O, MAI); 192 O << '\n'; 193 } else { 194 assert(I->hasLocalLinkage() && "Invalid alias linkage"); 195 } 196 197 printVisibility(Name, I->getVisibility()); 198 199 O << MAI->getSetDirective() << ' '; 200 Name->print(O, MAI); 201 O << ", "; 202 Target->print(O, MAI); 203 O << '\n'; 204 } 205 } 206 207 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 208 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 209 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 210 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 211 MP->finishAssembly(O, *this, *MAI); 212 213 // If we don't have any trampolines, then we don't require stack memory 214 // to be executable. Some targets have a directive to declare this. 215 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 216 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 217 if (MAI->getNonexecutableStackDirective()) 218 O << MAI->getNonexecutableStackDirective() << '\n'; 219 220 221 // Allow the target to emit any magic that it wants at the end of the file, 222 // after everything else has gone out. 223 EmitEndOfAsmFile(M); 224 225 delete Mang; Mang = 0; 226 DW = 0; MMI = 0; 227 228 OutStreamer.Finish(); 229 return false; 230} 231 232void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 233 // Get the function symbol. 234 CurrentFnSym = GetGlobalValueSymbol(MF.getFunction()); 235 IncrementFunctionNumber(); 236 237 if (VerboseAsm) 238 LI = &getAnalysis<MachineLoopInfo>(); 239} 240 241namespace { 242 // SectionCPs - Keep track the alignment, constpool entries per Section. 243 struct SectionCPs { 244 const MCSection *S; 245 unsigned Alignment; 246 SmallVector<unsigned, 4> CPEs; 247 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {} 248 }; 249} 250 251/// EmitConstantPool - Print to the current output stream assembly 252/// representations of the constants in the constant pool MCP. This is 253/// used to print out constants which have been "spilled to memory" by 254/// the code generator. 255/// 256void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) { 257 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 258 if (CP.empty()) return; 259 260 // Calculate sections for constant pool entries. We collect entries to go into 261 // the same section together to reduce amount of section switch statements. 262 SmallVector<SectionCPs, 4> CPSections; 263 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 264 const MachineConstantPoolEntry &CPE = CP[i]; 265 unsigned Align = CPE.getAlignment(); 266 267 SectionKind Kind; 268 switch (CPE.getRelocationInfo()) { 269 default: llvm_unreachable("Unknown section kind"); 270 case 2: Kind = SectionKind::getReadOnlyWithRel(); break; 271 case 1: 272 Kind = SectionKind::getReadOnlyWithRelLocal(); 273 break; 274 case 0: 275 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) { 276 case 4: Kind = SectionKind::getMergeableConst4(); break; 277 case 8: Kind = SectionKind::getMergeableConst8(); break; 278 case 16: Kind = SectionKind::getMergeableConst16();break; 279 default: Kind = SectionKind::getMergeableConst(); break; 280 } 281 } 282 283 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind); 284 285 // The number of sections are small, just do a linear search from the 286 // last section to the first. 287 bool Found = false; 288 unsigned SecIdx = CPSections.size(); 289 while (SecIdx != 0) { 290 if (CPSections[--SecIdx].S == S) { 291 Found = true; 292 break; 293 } 294 } 295 if (!Found) { 296 SecIdx = CPSections.size(); 297 CPSections.push_back(SectionCPs(S, Align)); 298 } 299 300 if (Align > CPSections[SecIdx].Alignment) 301 CPSections[SecIdx].Alignment = Align; 302 CPSections[SecIdx].CPEs.push_back(i); 303 } 304 305 // Now print stuff into the calculated sections. 306 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) { 307 OutStreamer.SwitchSection(CPSections[i].S); 308 EmitAlignment(Log2_32(CPSections[i].Alignment)); 309 310 unsigned Offset = 0; 311 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) { 312 unsigned CPI = CPSections[i].CPEs[j]; 313 MachineConstantPoolEntry CPE = CP[CPI]; 314 315 // Emit inter-object padding for alignment. 316 unsigned AlignMask = CPE.getAlignment() - 1; 317 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask; 318 EmitZeros(NewOffset - Offset); 319 320 const Type *Ty = CPE.getType(); 321 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty); 322 323 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' 324 << CPI << ':'; 325 if (VerboseAsm) { 326 O.PadToColumn(MAI->getCommentColumn()); 327 O << MAI->getCommentString() << " constant "; 328 WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent()); 329 } 330 O << '\n'; 331 if (CPE.isMachineConstantPoolEntry()) 332 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); 333 else 334 EmitGlobalConstant(CPE.Val.ConstVal); 335 } 336 } 337} 338 339/// EmitJumpTableInfo - Print assembly representations of the jump tables used 340/// by the current function to the current output stream. 341/// 342void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI, 343 MachineFunction &MF) { 344 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 345 if (JT.empty()) return; 346 347 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 348 349 // Pick the directive to use to print the jump table entries, and switch to 350 // the appropriate section. 351 TargetLowering *LoweringInfo = TM.getTargetLowering(); 352 353 const Function *F = MF.getFunction(); 354 bool JTInDiffSection = false; 355 if (F->isWeakForLinker() || 356 (IsPic && !LoweringInfo->usesGlobalOffsetTable())) { 357 // In PIC mode, we need to emit the jump table to the same section as the 358 // function body itself, otherwise the label differences won't make sense. 359 // We should also do if the section name is NULL or function is declared in 360 // discardable section. 361 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, 362 TM)); 363 } else { 364 // Otherwise, drop it in the readonly section. 365 const MCSection *ReadOnlySection = 366 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly()); 367 OutStreamer.SwitchSection(ReadOnlySection); 368 JTInDiffSection = true; 369 } 370 371 EmitAlignment(Log2_32(MJTI->getAlignment())); 372 373 for (unsigned i = 0, e = JT.size(); i != e; ++i) { 374 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; 375 376 // If this jump table was deleted, ignore it. 377 if (JTBBs.empty()) continue; 378 379 // For PIC codegen, if possible we want to use the SetDirective to reduce 380 // the number of relocations the assembler will generate for the jump table. 381 // Set directives are all printed before the jump table itself. 382 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; 383 if (MAI->getSetDirective() && IsPic) 384 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 385 if (EmittedSets.insert(JTBBs[ii])) 386 printPICJumpTableSetLabel(i, JTBBs[ii]); 387 388 // On some targets (e.g. Darwin) we want to emit two consequtive labels 389 // before each jump table. The first label is never referenced, but tells 390 // the assembler and linker the extents of the jump table object. The 391 // second label is actually referenced by the code. 392 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) { 393 O << MAI->getLinkerPrivateGlobalPrefix() 394 << "JTI" << getFunctionNumber() << '_' << i << ":\n"; 395 } 396 397 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 398 << '_' << i << ":\n"; 399 400 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 401 printPICJumpTableEntry(MJTI, JTBBs[ii], i); 402 O << '\n'; 403 } 404 } 405} 406 407void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, 408 const MachineBasicBlock *MBB, 409 unsigned uid) const { 410 bool isPIC = TM.getRelocationModel() == Reloc::PIC_; 411 412 // Use JumpTableDirective otherwise honor the entry size from the jump table 413 // info. 414 const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC); 415 bool HadJTEntryDirective = JTEntryDirective != NULL; 416 if (!HadJTEntryDirective) { 417 JTEntryDirective = MJTI->getEntrySize() == 4 ? 418 MAI->getData32bitsDirective() : MAI->getData64bitsDirective(); 419 } 420 421 O << JTEntryDirective << ' '; 422 423 // If we have emitted set directives for the jump table entries, print 424 // them rather than the entries themselves. If we're emitting PIC, then 425 // emit the table entries as differences between two text section labels. 426 // If we're emitting non-PIC code, then emit the entries as direct 427 // references to the target basic blocks. 428 if (!isPIC) { 429 GetMBBSymbol(MBB->getNumber())->print(O, MAI); 430 } else if (MAI->getSetDirective()) { 431 O << MAI->getPrivateGlobalPrefix() << getFunctionNumber() 432 << '_' << uid << "_set_" << MBB->getNumber(); 433 } else { 434 GetMBBSymbol(MBB->getNumber())->print(O, MAI); 435 // If the arch uses custom Jump Table directives, don't calc relative to 436 // JT 437 if (!HadJTEntryDirective) 438 O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" 439 << getFunctionNumber() << '_' << uid; 440 } 441} 442 443 444/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 445/// special global used by LLVM. If so, emit it and return true, otherwise 446/// do nothing and return false. 447bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 448 if (GV->getName() == "llvm.used") { 449 if (MAI->getUsedDirective() != 0) // No need to emit this at all. 450 EmitLLVMUsedList(GV->getInitializer()); 451 return true; 452 } 453 454 // Ignore debug and non-emitted data. This handles llvm.compiler.used. 455 if (GV->getSection() == "llvm.metadata" || 456 GV->hasAvailableExternallyLinkage()) 457 return true; 458 459 if (!GV->hasAppendingLinkage()) return false; 460 461 assert(GV->hasInitializer() && "Not a special LLVM global!"); 462 463 const TargetData *TD = TM.getTargetData(); 464 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 465 if (GV->getName() == "llvm.global_ctors") { 466 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection()); 467 EmitAlignment(Align, 0); 468 EmitXXStructorList(GV->getInitializer()); 469 return true; 470 } 471 472 if (GV->getName() == "llvm.global_dtors") { 473 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection()); 474 EmitAlignment(Align, 0); 475 EmitXXStructorList(GV->getInitializer()); 476 return true; 477 } 478 479 return false; 480} 481 482/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each 483/// global in the specified llvm.used list for which emitUsedDirectiveFor 484/// is true, as being used with this directive. 485void AsmPrinter::EmitLLVMUsedList(Constant *List) { 486 const char *Directive = MAI->getUsedDirective(); 487 488 // Should be an array of 'i8*'. 489 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 490 if (InitList == 0) return; 491 492 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 493 const GlobalValue *GV = 494 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts()); 495 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) { 496 O << Directive; 497 EmitConstantValueOnly(InitList->getOperand(i)); 498 O << '\n'; 499 } 500 } 501} 502 503/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 504/// function pointers, ignoring the init priority. 505void AsmPrinter::EmitXXStructorList(Constant *List) { 506 // Should be an array of '{ int, void ()* }' structs. The first value is the 507 // init priority, which we ignore. 508 if (!isa<ConstantArray>(List)) return; 509 ConstantArray *InitList = cast<ConstantArray>(List); 510 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 511 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 512 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 513 514 if (CS->getOperand(1)->isNullValue()) 515 return; // Found a null terminator, exit printing. 516 // Emit the function pointer. 517 EmitGlobalConstant(CS->getOperand(1)); 518 } 519} 520 521 522//===----------------------------------------------------------------------===// 523/// LEB 128 number encoding. 524 525/// PrintULEB128 - Print a series of hexadecimal values (separated by commas) 526/// representing an unsigned leb128 value. 527void AsmPrinter::PrintULEB128(unsigned Value) const { 528 char Buffer[20]; 529 do { 530 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 531 Value >>= 7; 532 if (Value) Byte |= 0x80; 533 O << "0x" << utohex_buffer(Byte, Buffer+20); 534 if (Value) O << ", "; 535 } while (Value); 536} 537 538/// PrintSLEB128 - Print a series of hexadecimal values (separated by commas) 539/// representing a signed leb128 value. 540void AsmPrinter::PrintSLEB128(int Value) const { 541 int Sign = Value >> (8 * sizeof(Value) - 1); 542 bool IsMore; 543 char Buffer[20]; 544 545 do { 546 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 547 Value >>= 7; 548 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; 549 if (IsMore) Byte |= 0x80; 550 O << "0x" << utohex_buffer(Byte, Buffer+20); 551 if (IsMore) O << ", "; 552 } while (IsMore); 553} 554 555//===--------------------------------------------------------------------===// 556// Emission and print routines 557// 558 559/// PrintHex - Print a value as a hexadecimal value. 560/// 561void AsmPrinter::PrintHex(int Value) const { 562 char Buffer[20]; 563 O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20); 564} 565 566/// EOL - Print a newline character to asm stream. If a comment is present 567/// then it will be printed first. Comments should not contain '\n'. 568void AsmPrinter::EOL() const { 569 O << '\n'; 570} 571 572void AsmPrinter::EOL(const std::string &Comment) const { 573 if (VerboseAsm && !Comment.empty()) { 574 O.PadToColumn(MAI->getCommentColumn()); 575 O << MAI->getCommentString() 576 << ' ' 577 << Comment; 578 } 579 O << '\n'; 580} 581 582void AsmPrinter::EOL(const char* Comment) const { 583 if (VerboseAsm && *Comment) { 584 O.PadToColumn(MAI->getCommentColumn()); 585 O << MAI->getCommentString() 586 << ' ' 587 << Comment; 588 } 589 O << '\n'; 590} 591 592static const char *DecodeDWARFEncoding(unsigned Encoding) { 593 switch (Encoding) { 594 case dwarf::DW_EH_PE_absptr: 595 return "absptr"; 596 case dwarf::DW_EH_PE_omit: 597 return "omit"; 598 case dwarf::DW_EH_PE_pcrel: 599 return "pcrel"; 600 case dwarf::DW_EH_PE_udata4: 601 return "udata4"; 602 case dwarf::DW_EH_PE_udata8: 603 return "udata8"; 604 case dwarf::DW_EH_PE_sdata4: 605 return "sdata4"; 606 case dwarf::DW_EH_PE_sdata8: 607 return "sdata8"; 608 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4: 609 return "pcrel udata4"; 610 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4: 611 return "pcrel sdata4"; 612 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8: 613 return "pcrel udata8"; 614 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8: 615 return "pcrel sdata8"; 616 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4: 617 return "indirect pcrel udata4"; 618 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4: 619 return "indirect pcrel sdata4"; 620 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8: 621 return "indirect pcrel udata8"; 622 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8: 623 return "indirect pcrel sdata8"; 624 } 625 626 return 0; 627} 628 629void AsmPrinter::EOL(const char *Comment, unsigned Encoding) const { 630 if (VerboseAsm && *Comment) { 631 O.PadToColumn(MAI->getCommentColumn()); 632 O << MAI->getCommentString() 633 << ' ' 634 << Comment; 635 636 if (const char *EncStr = DecodeDWARFEncoding(Encoding)) 637 O << " (" << EncStr << ')'; 638 } 639 O << '\n'; 640} 641 642/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an 643/// unsigned leb128 value. 644void AsmPrinter::EmitULEB128Bytes(unsigned Value) const { 645 if (MAI->hasLEB128()) { 646 O << "\t.uleb128\t" 647 << Value; 648 } else { 649 O << MAI->getData8bitsDirective(); 650 PrintULEB128(Value); 651 } 652} 653 654/// EmitSLEB128Bytes - print an assembler byte data directive to compose a 655/// signed leb128 value. 656void AsmPrinter::EmitSLEB128Bytes(int Value) const { 657 if (MAI->hasLEB128()) { 658 O << "\t.sleb128\t" 659 << Value; 660 } else { 661 O << MAI->getData8bitsDirective(); 662 PrintSLEB128(Value); 663 } 664} 665 666/// EmitInt8 - Emit a byte directive and value. 667/// 668void AsmPrinter::EmitInt8(int Value) const { 669 O << MAI->getData8bitsDirective(); 670 PrintHex(Value & 0xFF); 671} 672 673/// EmitInt16 - Emit a short directive and value. 674/// 675void AsmPrinter::EmitInt16(int Value) const { 676 O << MAI->getData16bitsDirective(); 677 PrintHex(Value & 0xFFFF); 678} 679 680/// EmitInt32 - Emit a long directive and value. 681/// 682void AsmPrinter::EmitInt32(int Value) const { 683 O << MAI->getData32bitsDirective(); 684 PrintHex(Value); 685} 686 687/// EmitInt64 - Emit a long long directive and value. 688/// 689void AsmPrinter::EmitInt64(uint64_t Value) const { 690 if (MAI->getData64bitsDirective()) { 691 O << MAI->getData64bitsDirective(); 692 PrintHex(Value); 693 } else { 694 if (TM.getTargetData()->isBigEndian()) { 695 EmitInt32(unsigned(Value >> 32)); O << '\n'; 696 EmitInt32(unsigned(Value)); 697 } else { 698 EmitInt32(unsigned(Value)); O << '\n'; 699 EmitInt32(unsigned(Value >> 32)); 700 } 701 } 702} 703 704/// toOctal - Convert the low order bits of X into an octal digit. 705/// 706static inline char toOctal(int X) { 707 return (X&7)+'0'; 708} 709 710/// printStringChar - Print a char, escaped if necessary. 711/// 712static void printStringChar(formatted_raw_ostream &O, unsigned char C) { 713 if (C == '"') { 714 O << "\\\""; 715 } else if (C == '\\') { 716 O << "\\\\"; 717 } else if (isprint((unsigned char)C)) { 718 O << C; 719 } else { 720 switch(C) { 721 case '\b': O << "\\b"; break; 722 case '\f': O << "\\f"; break; 723 case '\n': O << "\\n"; break; 724 case '\r': O << "\\r"; break; 725 case '\t': O << "\\t"; break; 726 default: 727 O << '\\'; 728 O << toOctal(C >> 6); 729 O << toOctal(C >> 3); 730 O << toOctal(C >> 0); 731 break; 732 } 733 } 734} 735 736/// EmitString - Emit a string with quotes and a null terminator. 737/// Special characters are emitted properly. 738/// \literal (Eg. '\t') \endliteral 739void AsmPrinter::EmitString(const StringRef String) const { 740 EmitString(String.data(), String.size()); 741} 742 743void AsmPrinter::EmitString(const char *String, unsigned Size) const { 744 const char* AscizDirective = MAI->getAscizDirective(); 745 if (AscizDirective) 746 O << AscizDirective; 747 else 748 O << MAI->getAsciiDirective(); 749 O << '\"'; 750 for (unsigned i = 0; i < Size; ++i) 751 printStringChar(O, String[i]); 752 if (AscizDirective) 753 O << '\"'; 754 else 755 O << "\\0\""; 756} 757 758 759/// EmitFile - Emit a .file directive. 760void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const { 761 O << "\t.file\t" << Number << " \""; 762 for (unsigned i = 0, N = Name.size(); i < N; ++i) 763 printStringChar(O, Name[i]); 764 O << '\"'; 765} 766 767 768//===----------------------------------------------------------------------===// 769 770// EmitAlignment - Emit an alignment directive to the specified power of 771// two boundary. For example, if you pass in 3 here, you will get an 8 772// byte alignment. If a global value is specified, and if that global has 773// an explicit alignment requested, it will unconditionally override the 774// alignment request. However, if ForcedAlignBits is specified, this value 775// has final say: the ultimate alignment will be the max of ForcedAlignBits 776// and the alignment computed with NumBits and the global. 777// 778// The algorithm is: 779// Align = NumBits; 780// if (GV && GV->hasalignment) Align = GV->getalignment(); 781// Align = std::max(Align, ForcedAlignBits); 782// 783void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 784 unsigned ForcedAlignBits, 785 bool UseFillExpr) const { 786 if (GV && GV->getAlignment()) 787 NumBits = Log2_32(GV->getAlignment()); 788 NumBits = std::max(NumBits, ForcedAlignBits); 789 790 if (NumBits == 0) return; // No need to emit alignment. 791 792 unsigned FillValue = 0; 793 if (getCurrentSection()->getKind().isText()) 794 FillValue = MAI->getTextAlignFillValue(); 795 796 OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0); 797} 798 799/// EmitZeros - Emit a block of zeros. 800/// 801void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const { 802 if (NumZeros) { 803 if (MAI->getZeroDirective()) { 804 O << MAI->getZeroDirective() << NumZeros; 805 if (MAI->getZeroDirectiveSuffix()) 806 O << MAI->getZeroDirectiveSuffix(); 807 O << '\n'; 808 } else { 809 for (; NumZeros; --NumZeros) 810 O << MAI->getData8bitsDirective(AddrSpace) << "0\n"; 811 } 812 } 813} 814 815// Print out the specified constant, without a storage class. Only the 816// constants valid in constant expressions can occur here. 817void AsmPrinter::EmitConstantValueOnly(const Constant *CV) { 818 if (CV->isNullValue() || isa<UndefValue>(CV)) { 819 O << '0'; 820 return; 821 } 822 823 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 824 O << CI->getZExtValue(); 825 return; 826 } 827 828 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) { 829 // This is a constant address for a global variable or function. Use the 830 // name of the variable or function as the address value. 831 O << Mang->getMangledName(GV); 832 return; 833 } 834 835 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) { 836 GetBlockAddressSymbol(BA)->print(O, MAI); 837 return; 838 } 839 840 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV); 841 if (CE == 0) { 842 llvm_unreachable("Unknown constant value!"); 843 O << '0'; 844 return; 845 } 846 847 switch (CE->getOpcode()) { 848 case Instruction::ZExt: 849 case Instruction::SExt: 850 case Instruction::FPTrunc: 851 case Instruction::FPExt: 852 case Instruction::UIToFP: 853 case Instruction::SIToFP: 854 case Instruction::FPToUI: 855 case Instruction::FPToSI: 856 default: 857 llvm_unreachable("FIXME: Don't support this constant cast expr"); 858 case Instruction::GetElementPtr: { 859 // generate a symbolic expression for the byte address 860 const TargetData *TD = TM.getTargetData(); 861 const Constant *ptrVal = CE->getOperand(0); 862 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 863 int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], 864 idxVec.size()); 865 if (Offset == 0) 866 return EmitConstantValueOnly(ptrVal); 867 868 // Truncate/sext the offset to the pointer size. 869 if (TD->getPointerSizeInBits() != 64) { 870 int SExtAmount = 64-TD->getPointerSizeInBits(); 871 Offset = (Offset << SExtAmount) >> SExtAmount; 872 } 873 874 if (Offset) 875 O << '('; 876 EmitConstantValueOnly(ptrVal); 877 if (Offset > 0) 878 O << ") + " << Offset; 879 else 880 O << ") - " << -Offset; 881 return; 882 } 883 case Instruction::BitCast: 884 return EmitConstantValueOnly(CE->getOperand(0)); 885 886 case Instruction::IntToPtr: { 887 // Handle casts to pointers by changing them into casts to the appropriate 888 // integer type. This promotes constant folding and simplifies this code. 889 const TargetData *TD = TM.getTargetData(); 890 Constant *Op = CE->getOperand(0); 891 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()), 892 false/*ZExt*/); 893 return EmitConstantValueOnly(Op); 894 } 895 896 case Instruction::PtrToInt: { 897 // Support only foldable casts to/from pointers that can be eliminated by 898 // changing the pointer to the appropriately sized integer type. 899 Constant *Op = CE->getOperand(0); 900 const Type *Ty = CE->getType(); 901 const TargetData *TD = TM.getTargetData(); 902 903 // We can emit the pointer value into this slot if the slot is an 904 // integer slot greater or equal to the size of the pointer. 905 if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType())) 906 return EmitConstantValueOnly(Op); 907 908 O << "(("; 909 EmitConstantValueOnly(Op); 910 APInt ptrMask = 911 APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType())); 912 913 SmallString<40> S; 914 ptrMask.toStringUnsigned(S); 915 O << ") & " << S.str() << ')'; 916 return; 917 } 918 919 case Instruction::Trunc: 920 // We emit the value and depend on the assembler to truncate the generated 921 // expression properly. This is important for differences between 922 // blockaddress labels. Since the two labels are in the same function, it 923 // is reasonable to treat their delta as a 32-bit value. 924 return EmitConstantValueOnly(CE->getOperand(0)); 925 926 case Instruction::Add: 927 case Instruction::Sub: 928 case Instruction::And: 929 case Instruction::Or: 930 case Instruction::Xor: 931 O << '('; 932 EmitConstantValueOnly(CE->getOperand(0)); 933 O << ')'; 934 switch (CE->getOpcode()) { 935 case Instruction::Add: 936 O << " + "; 937 break; 938 case Instruction::Sub: 939 O << " - "; 940 break; 941 case Instruction::And: 942 O << " & "; 943 break; 944 case Instruction::Or: 945 O << " | "; 946 break; 947 case Instruction::Xor: 948 O << " ^ "; 949 break; 950 default: 951 break; 952 } 953 O << '('; 954 EmitConstantValueOnly(CE->getOperand(1)); 955 O << ')'; 956 break; 957 } 958} 959 960/// printAsCString - Print the specified array as a C compatible string, only if 961/// the predicate isString is true. 962/// 963static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA, 964 unsigned LastElt) { 965 assert(CVA->isString() && "Array is not string compatible!"); 966 967 O << '\"'; 968 for (unsigned i = 0; i != LastElt; ++i) { 969 unsigned char C = 970 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue(); 971 printStringChar(O, C); 972 } 973 O << '\"'; 974} 975 976/// EmitString - Emit a zero-byte-terminated string constant. 977/// 978void AsmPrinter::EmitString(const ConstantArray *CVA) const { 979 unsigned NumElts = CVA->getNumOperands(); 980 if (MAI->getAscizDirective() && NumElts && 981 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) { 982 O << MAI->getAscizDirective(); 983 printAsCString(O, CVA, NumElts-1); 984 } else { 985 O << MAI->getAsciiDirective(); 986 printAsCString(O, CVA, NumElts); 987 } 988 O << '\n'; 989} 990 991void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA, 992 unsigned AddrSpace) { 993 if (CVA->isString()) { 994 EmitString(CVA); 995 } else { // Not a string. Print the values in successive locations 996 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) 997 EmitGlobalConstant(CVA->getOperand(i), AddrSpace); 998 } 999} 1000 1001void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) { 1002 const VectorType *PTy = CP->getType(); 1003 1004 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I) 1005 EmitGlobalConstant(CP->getOperand(I)); 1006} 1007 1008void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS, 1009 unsigned AddrSpace) { 1010 // Print the fields in successive locations. Pad to align if needed! 1011 const TargetData *TD = TM.getTargetData(); 1012 unsigned Size = TD->getTypeAllocSize(CVS->getType()); 1013 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType()); 1014 uint64_t sizeSoFar = 0; 1015 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) { 1016 const Constant* field = CVS->getOperand(i); 1017 1018 // Check if padding is needed and insert one or more 0s. 1019 uint64_t fieldSize = TD->getTypeAllocSize(field->getType()); 1020 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1)) 1021 - cvsLayout->getElementOffset(i)) - fieldSize; 1022 sizeSoFar += fieldSize + padSize; 1023 1024 // Now print the actual field value. 1025 EmitGlobalConstant(field, AddrSpace); 1026 1027 // Insert padding - this may include padding to increase the size of the 1028 // current field up to the ABI size (if the struct is not packed) as well 1029 // as padding to ensure that the next field starts at the right offset. 1030 EmitZeros(padSize, AddrSpace); 1031 } 1032 assert(sizeSoFar == cvsLayout->getSizeInBytes() && 1033 "Layout of constant struct may be incorrect!"); 1034} 1035 1036void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP, 1037 unsigned AddrSpace) { 1038 // FP Constants are printed as integer constants to avoid losing 1039 // precision... 1040 LLVMContext &Context = CFP->getContext(); 1041 const TargetData *TD = TM.getTargetData(); 1042 if (CFP->getType()->isDoubleTy()) { 1043 double Val = CFP->getValueAPF().convertToDouble(); // for comment only 1044 uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1045 if (MAI->getData64bitsDirective(AddrSpace)) { 1046 O << MAI->getData64bitsDirective(AddrSpace) << i; 1047 if (VerboseAsm) { 1048 O.PadToColumn(MAI->getCommentColumn()); 1049 O << MAI->getCommentString() << " double " << Val; 1050 } 1051 O << '\n'; 1052 } else if (TD->isBigEndian()) { 1053 O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32); 1054 if (VerboseAsm) { 1055 O.PadToColumn(MAI->getCommentColumn()); 1056 O << MAI->getCommentString() 1057 << " most significant word of double " << Val; 1058 } 1059 O << '\n'; 1060 O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i); 1061 if (VerboseAsm) { 1062 O.PadToColumn(MAI->getCommentColumn()); 1063 O << MAI->getCommentString() 1064 << " least significant word of double " << Val; 1065 } 1066 O << '\n'; 1067 } else { 1068 O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i); 1069 if (VerboseAsm) { 1070 O.PadToColumn(MAI->getCommentColumn()); 1071 O << MAI->getCommentString() 1072 << " least significant word of double " << Val; 1073 } 1074 O << '\n'; 1075 O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32); 1076 if (VerboseAsm) { 1077 O.PadToColumn(MAI->getCommentColumn()); 1078 O << MAI->getCommentString() 1079 << " most significant word of double " << Val; 1080 } 1081 O << '\n'; 1082 } 1083 return; 1084 } 1085 1086 if (CFP->getType()->isFloatTy()) { 1087 float Val = CFP->getValueAPF().convertToFloat(); // for comment only 1088 O << MAI->getData32bitsDirective(AddrSpace) 1089 << CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1090 if (VerboseAsm) { 1091 O.PadToColumn(MAI->getCommentColumn()); 1092 O << MAI->getCommentString() << " float " << Val; 1093 } 1094 O << '\n'; 1095 return; 1096 } 1097 1098 if (CFP->getType()->isX86_FP80Ty()) { 1099 // all long double variants are printed as hex 1100 // api needed to prevent premature destruction 1101 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1102 const uint64_t *p = api.getRawData(); 1103 // Convert to double so we can print the approximate val as a comment. 1104 APFloat DoubleVal = CFP->getValueAPF(); 1105 bool ignored; 1106 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 1107 &ignored); 1108 if (TD->isBigEndian()) { 1109 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]); 1110 if (VerboseAsm) { 1111 O.PadToColumn(MAI->getCommentColumn()); 1112 O << MAI->getCommentString() 1113 << " most significant halfword of x86_fp80 ~" 1114 << DoubleVal.convertToDouble(); 1115 } 1116 O << '\n'; 1117 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48); 1118 if (VerboseAsm) { 1119 O.PadToColumn(MAI->getCommentColumn()); 1120 O << MAI->getCommentString() << " next halfword"; 1121 } 1122 O << '\n'; 1123 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32); 1124 if (VerboseAsm) { 1125 O.PadToColumn(MAI->getCommentColumn()); 1126 O << MAI->getCommentString() << " next halfword"; 1127 } 1128 O << '\n'; 1129 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16); 1130 if (VerboseAsm) { 1131 O.PadToColumn(MAI->getCommentColumn()); 1132 O << MAI->getCommentString() << " next halfword"; 1133 } 1134 O << '\n'; 1135 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]); 1136 if (VerboseAsm) { 1137 O.PadToColumn(MAI->getCommentColumn()); 1138 O << MAI->getCommentString() 1139 << " least significant halfword"; 1140 } 1141 O << '\n'; 1142 } else { 1143 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]); 1144 if (VerboseAsm) { 1145 O.PadToColumn(MAI->getCommentColumn()); 1146 O << MAI->getCommentString() 1147 << " least significant halfword of x86_fp80 ~" 1148 << DoubleVal.convertToDouble(); 1149 } 1150 O << '\n'; 1151 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16); 1152 if (VerboseAsm) { 1153 O.PadToColumn(MAI->getCommentColumn()); 1154 O << MAI->getCommentString() 1155 << " next halfword"; 1156 } 1157 O << '\n'; 1158 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32); 1159 if (VerboseAsm) { 1160 O.PadToColumn(MAI->getCommentColumn()); 1161 O << MAI->getCommentString() 1162 << " next halfword"; 1163 } 1164 O << '\n'; 1165 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48); 1166 if (VerboseAsm) { 1167 O.PadToColumn(MAI->getCommentColumn()); 1168 O << MAI->getCommentString() 1169 << " next halfword"; 1170 } 1171 O << '\n'; 1172 O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]); 1173 if (VerboseAsm) { 1174 O.PadToColumn(MAI->getCommentColumn()); 1175 O << MAI->getCommentString() 1176 << " most significant halfword"; 1177 } 1178 O << '\n'; 1179 } 1180 EmitZeros(TD->getTypeAllocSize(Type::getX86_FP80Ty(Context)) - 1181 TD->getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace); 1182 return; 1183 } 1184 1185 if (CFP->getType()->isPPC_FP128Ty()) { 1186 // all long double variants are printed as hex 1187 // api needed to prevent premature destruction 1188 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1189 const uint64_t *p = api.getRawData(); 1190 if (TD->isBigEndian()) { 1191 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32); 1192 if (VerboseAsm) { 1193 O.PadToColumn(MAI->getCommentColumn()); 1194 O << MAI->getCommentString() 1195 << " most significant word of ppc_fp128"; 1196 } 1197 O << '\n'; 1198 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]); 1199 if (VerboseAsm) { 1200 O.PadToColumn(MAI->getCommentColumn()); 1201 O << MAI->getCommentString() 1202 << " next word"; 1203 } 1204 O << '\n'; 1205 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32); 1206 if (VerboseAsm) { 1207 O.PadToColumn(MAI->getCommentColumn()); 1208 O << MAI->getCommentString() 1209 << " next word"; 1210 } 1211 O << '\n'; 1212 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]); 1213 if (VerboseAsm) { 1214 O.PadToColumn(MAI->getCommentColumn()); 1215 O << MAI->getCommentString() 1216 << " least significant word"; 1217 } 1218 O << '\n'; 1219 } else { 1220 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]); 1221 if (VerboseAsm) { 1222 O.PadToColumn(MAI->getCommentColumn()); 1223 O << MAI->getCommentString() 1224 << " least significant word of ppc_fp128"; 1225 } 1226 O << '\n'; 1227 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32); 1228 if (VerboseAsm) { 1229 O.PadToColumn(MAI->getCommentColumn()); 1230 O << MAI->getCommentString() 1231 << " next word"; 1232 } 1233 O << '\n'; 1234 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]); 1235 if (VerboseAsm) { 1236 O.PadToColumn(MAI->getCommentColumn()); 1237 O << MAI->getCommentString() 1238 << " next word"; 1239 } 1240 O << '\n'; 1241 O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32); 1242 if (VerboseAsm) { 1243 O.PadToColumn(MAI->getCommentColumn()); 1244 O << MAI->getCommentString() 1245 << " most significant word"; 1246 } 1247 O << '\n'; 1248 } 1249 return; 1250 } else llvm_unreachable("Floating point constant type not handled"); 1251} 1252 1253void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI, 1254 unsigned AddrSpace) { 1255 const TargetData *TD = TM.getTargetData(); 1256 unsigned BitWidth = CI->getBitWidth(); 1257 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits"); 1258 1259 // We don't expect assemblers to support integer data directives 1260 // for more than 64 bits, so we emit the data in at most 64-bit 1261 // quantities at a time. 1262 const uint64_t *RawData = CI->getValue().getRawData(); 1263 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1264 uint64_t Val; 1265 if (TD->isBigEndian()) 1266 Val = RawData[e - i - 1]; 1267 else 1268 Val = RawData[i]; 1269 1270 if (MAI->getData64bitsDirective(AddrSpace)) { 1271 O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n'; 1272 continue; 1273 } 1274 1275 // Emit two 32-bit chunks, order depends on endianness. 1276 unsigned FirstChunk = unsigned(Val), SecondChunk = unsigned(Val >> 32); 1277 const char *FirstName = " least", *SecondName = " most"; 1278 if (TD->isBigEndian()) { 1279 std::swap(FirstChunk, SecondChunk); 1280 std::swap(FirstName, SecondName); 1281 } 1282 1283 O << MAI->getData32bitsDirective(AddrSpace) << FirstChunk; 1284 if (VerboseAsm) { 1285 O.PadToColumn(MAI->getCommentColumn()); 1286 O << MAI->getCommentString() 1287 << FirstName << " significant half of i64 " << Val; 1288 } 1289 O << '\n'; 1290 1291 O << MAI->getData32bitsDirective(AddrSpace) << SecondChunk; 1292 if (VerboseAsm) { 1293 O.PadToColumn(MAI->getCommentColumn()); 1294 O << MAI->getCommentString() 1295 << SecondName << " significant half of i64 " << Val; 1296 } 1297 O << '\n'; 1298 } 1299} 1300 1301/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 1302void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { 1303 const TargetData *TD = TM.getTargetData(); 1304 const Type *type = CV->getType(); 1305 unsigned Size = TD->getTypeAllocSize(type); 1306 1307 if (CV->isNullValue() || isa<UndefValue>(CV)) { 1308 EmitZeros(Size, AddrSpace); 1309 return; 1310 } 1311 1312 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) { 1313 EmitGlobalConstantArray(CVA , AddrSpace); 1314 return; 1315 } 1316 1317 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) { 1318 EmitGlobalConstantStruct(CVS, AddrSpace); 1319 return; 1320 } 1321 1322 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) { 1323 EmitGlobalConstantFP(CFP, AddrSpace); 1324 return; 1325 } 1326 1327 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1328 // If we can directly emit an 8-byte constant, do it. 1329 if (Size == 8) 1330 if (const char *Data64Dir = MAI->getData64bitsDirective(AddrSpace)) { 1331 O << Data64Dir << CI->getZExtValue() << '\n'; 1332 return; 1333 } 1334 1335 // Small integers are handled below; large integers are handled here. 1336 if (Size > 4) { 1337 EmitGlobalConstantLargeInt(CI, AddrSpace); 1338 return; 1339 } 1340 } 1341 1342 if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) { 1343 EmitGlobalConstantVector(CP); 1344 return; 1345 } 1346 1347 printDataDirective(type, AddrSpace); 1348 EmitConstantValueOnly(CV); 1349 if (VerboseAsm) { 1350 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1351 SmallString<40> S; 1352 CI->getValue().toStringUnsigned(S, 16); 1353 O.PadToColumn(MAI->getCommentColumn()); 1354 O << MAI->getCommentString() << " 0x" << S.str(); 1355 } 1356 } 1357 O << '\n'; 1358} 1359 1360void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1361 // Target doesn't support this yet! 1362 llvm_unreachable("Target does not support EmitMachineConstantPoolValue"); 1363} 1364 1365/// PrintSpecial - Print information related to the specified machine instr 1366/// that is independent of the operand, and may be independent of the instr 1367/// itself. This can be useful for portably encoding the comment character 1368/// or other bits of target-specific knowledge into the asmstrings. The 1369/// syntax used is ${:comment}. Targets can override this to add support 1370/// for their own strange codes. 1371void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const { 1372 if (!strcmp(Code, "private")) { 1373 O << MAI->getPrivateGlobalPrefix(); 1374 } else if (!strcmp(Code, "comment")) { 1375 if (VerboseAsm) 1376 O << MAI->getCommentString(); 1377 } else if (!strcmp(Code, "uid")) { 1378 // Comparing the address of MI isn't sufficient, because machineinstrs may 1379 // be allocated to the same address across functions. 1380 const Function *ThisF = MI->getParent()->getParent()->getFunction(); 1381 1382 // If this is a new LastFn instruction, bump the counter. 1383 if (LastMI != MI || LastFn != ThisF) { 1384 ++Counter; 1385 LastMI = MI; 1386 LastFn = ThisF; 1387 } 1388 O << Counter; 1389 } else { 1390 std::string msg; 1391 raw_string_ostream Msg(msg); 1392 Msg << "Unknown special formatter '" << Code 1393 << "' for machine instr: " << *MI; 1394 llvm_report_error(Msg.str()); 1395 } 1396} 1397 1398/// processDebugLoc - Processes the debug information of each machine 1399/// instruction's DebugLoc. 1400void AsmPrinter::processDebugLoc(const MachineInstr *MI, 1401 bool BeforePrintingInsn) { 1402 if (!MAI || !DW || !MAI->doesSupportDebugInformation() 1403 || !DW->ShouldEmitDwarfDebug()) 1404 return; 1405 DebugLoc DL = MI->getDebugLoc(); 1406 if (DL.isUnknown()) 1407 return; 1408 DILocation CurDLT = MF->getDILocation(DL); 1409 if (CurDLT.getScope().isNull()) 1410 return; 1411 1412 if (BeforePrintingInsn) { 1413 if (CurDLT.getNode() != PrevDLT.getNode()) { 1414 unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(), 1415 CurDLT.getColumnNumber(), 1416 CurDLT.getScope().getNode()); 1417 printLabel(L); 1418 O << '\n'; 1419 DW->BeginScope(MI, L); 1420 PrevDLT = CurDLT; 1421 } 1422 } else { 1423 // After printing instruction 1424 DW->EndScope(MI); 1425 } 1426} 1427 1428 1429/// printInlineAsm - This method formats and prints the specified machine 1430/// instruction that is an inline asm. 1431void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { 1432 unsigned NumOperands = MI->getNumOperands(); 1433 1434 // Count the number of register definitions. 1435 unsigned NumDefs = 0; 1436 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef(); 1437 ++NumDefs) 1438 assert(NumDefs != NumOperands-1 && "No asm string?"); 1439 1440 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?"); 1441 1442 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. 1443 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); 1444 1445 O << '\t'; 1446 1447 // If this asmstr is empty, just print the #APP/#NOAPP markers. 1448 // These are useful to see where empty asm's wound up. 1449 if (AsmStr[0] == 0) { 1450 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1451 O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n'; 1452 return; 1453 } 1454 1455 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t"; 1456 1457 // The variant of the current asmprinter. 1458 int AsmPrinterVariant = MAI->getAssemblerDialect(); 1459 1460 int CurVariant = -1; // The number of the {.|.|.} region we are in. 1461 const char *LastEmitted = AsmStr; // One past the last character emitted. 1462 1463 while (*LastEmitted) { 1464 switch (*LastEmitted) { 1465 default: { 1466 // Not a special case, emit the string section literally. 1467 const char *LiteralEnd = LastEmitted+1; 1468 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && 1469 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') 1470 ++LiteralEnd; 1471 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1472 O.write(LastEmitted, LiteralEnd-LastEmitted); 1473 LastEmitted = LiteralEnd; 1474 break; 1475 } 1476 case '\n': 1477 ++LastEmitted; // Consume newline character. 1478 O << '\n'; // Indent code with newline. 1479 break; 1480 case '$': { 1481 ++LastEmitted; // Consume '$' character. 1482 bool Done = true; 1483 1484 // Handle escapes. 1485 switch (*LastEmitted) { 1486 default: Done = false; break; 1487 case '$': // $$ -> $ 1488 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1489 O << '$'; 1490 ++LastEmitted; // Consume second '$' character. 1491 break; 1492 case '(': // $( -> same as GCC's { character. 1493 ++LastEmitted; // Consume '(' character. 1494 if (CurVariant != -1) { 1495 llvm_report_error("Nested variants found in inline asm string: '" 1496 + std::string(AsmStr) + "'"); 1497 } 1498 CurVariant = 0; // We're in the first variant now. 1499 break; 1500 case '|': 1501 ++LastEmitted; // consume '|' character. 1502 if (CurVariant == -1) 1503 O << '|'; // this is gcc's behavior for | outside a variant 1504 else 1505 ++CurVariant; // We're in the next variant. 1506 break; 1507 case ')': // $) -> same as GCC's } char. 1508 ++LastEmitted; // consume ')' character. 1509 if (CurVariant == -1) 1510 O << '}'; // this is gcc's behavior for } outside a variant 1511 else 1512 CurVariant = -1; 1513 break; 1514 } 1515 if (Done) break; 1516 1517 bool HasCurlyBraces = false; 1518 if (*LastEmitted == '{') { // ${variable} 1519 ++LastEmitted; // Consume '{' character. 1520 HasCurlyBraces = true; 1521 } 1522 1523 // If we have ${:foo}, then this is not a real operand reference, it is a 1524 // "magic" string reference, just like in .td files. Arrange to call 1525 // PrintSpecial. 1526 if (HasCurlyBraces && *LastEmitted == ':') { 1527 ++LastEmitted; 1528 const char *StrStart = LastEmitted; 1529 const char *StrEnd = strchr(StrStart, '}'); 1530 if (StrEnd == 0) { 1531 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '" 1532 + std::string(AsmStr) + "'"); 1533 } 1534 1535 std::string Val(StrStart, StrEnd); 1536 PrintSpecial(MI, Val.c_str()); 1537 LastEmitted = StrEnd+1; 1538 break; 1539 } 1540 1541 const char *IDStart = LastEmitted; 1542 char *IDEnd; 1543 errno = 0; 1544 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. 1545 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { 1546 llvm_report_error("Bad $ operand number in inline asm string: '" 1547 + std::string(AsmStr) + "'"); 1548 } 1549 LastEmitted = IDEnd; 1550 1551 char Modifier[2] = { 0, 0 }; 1552 1553 if (HasCurlyBraces) { 1554 // If we have curly braces, check for a modifier character. This 1555 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. 1556 if (*LastEmitted == ':') { 1557 ++LastEmitted; // Consume ':' character. 1558 if (*LastEmitted == 0) { 1559 llvm_report_error("Bad ${:} expression in inline asm string: '" 1560 + std::string(AsmStr) + "'"); 1561 } 1562 1563 Modifier[0] = *LastEmitted; 1564 ++LastEmitted; // Consume modifier character. 1565 } 1566 1567 if (*LastEmitted != '}') { 1568 llvm_report_error("Bad ${} expression in inline asm string: '" 1569 + std::string(AsmStr) + "'"); 1570 } 1571 ++LastEmitted; // Consume '}' character. 1572 } 1573 1574 if ((unsigned)Val >= NumOperands-1) { 1575 llvm_report_error("Invalid $ operand number in inline asm string: '" 1576 + std::string(AsmStr) + "'"); 1577 } 1578 1579 // Okay, we finally have a value number. Ask the target to print this 1580 // operand! 1581 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { 1582 unsigned OpNo = 1; 1583 1584 bool Error = false; 1585 1586 // Scan to find the machine operand number for the operand. 1587 for (; Val; --Val) { 1588 if (OpNo >= MI->getNumOperands()) break; 1589 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1590 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1; 1591 } 1592 1593 if (OpNo >= MI->getNumOperands()) { 1594 Error = true; 1595 } else { 1596 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1597 ++OpNo; // Skip over the ID number. 1598 1599 if (Modifier[0]=='l') // labels are target independent 1600 GetMBBSymbol(MI->getOperand(OpNo).getMBB() 1601 ->getNumber())->print(O, MAI); 1602 else { 1603 AsmPrinter *AP = const_cast<AsmPrinter*>(this); 1604 if ((OpFlags & 7) == 4) { 1605 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, 1606 Modifier[0] ? Modifier : 0); 1607 } else { 1608 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, 1609 Modifier[0] ? Modifier : 0); 1610 } 1611 } 1612 } 1613 if (Error) { 1614 std::string msg; 1615 raw_string_ostream Msg(msg); 1616 Msg << "Invalid operand found in inline asm: '" 1617 << AsmStr << "'\n"; 1618 MI->print(Msg); 1619 llvm_report_error(Msg.str()); 1620 } 1621 } 1622 break; 1623 } 1624 } 1625 } 1626 O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd(); 1627} 1628 1629/// printImplicitDef - This method prints the specified machine instruction 1630/// that is an implicit def. 1631void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { 1632 if (!VerboseAsm) return; 1633 O.PadToColumn(MAI->getCommentColumn()); 1634 O << MAI->getCommentString() << " implicit-def: " 1635 << TRI->getName(MI->getOperand(0).getReg()); 1636} 1637 1638void AsmPrinter::printKill(const MachineInstr *MI) const { 1639 if (!VerboseAsm) return; 1640 O.PadToColumn(MAI->getCommentColumn()); 1641 O << MAI->getCommentString() << " kill:"; 1642 for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) { 1643 const MachineOperand &op = MI->getOperand(n); 1644 assert(op.isReg() && "KILL instruction must have only register operands"); 1645 O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>"); 1646 } 1647} 1648 1649/// printLabel - This method prints a local label used by debug and 1650/// exception handling tables. 1651void AsmPrinter::printLabel(const MachineInstr *MI) const { 1652 printLabel(MI->getOperand(0).getImm()); 1653} 1654 1655void AsmPrinter::printLabel(unsigned Id) const { 1656 O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':'; 1657} 1658 1659/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 1660/// instruction, using the specified assembler variant. Targets should 1661/// override this to format as appropriate. 1662bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 1663 unsigned AsmVariant, const char *ExtraCode) { 1664 // Target doesn't support this yet! 1665 return true; 1666} 1667 1668bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 1669 unsigned AsmVariant, 1670 const char *ExtraCode) { 1671 // Target doesn't support this yet! 1672 return true; 1673} 1674 1675MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA, 1676 const char *Suffix) const { 1677 return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix); 1678} 1679 1680MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F, 1681 const BasicBlock *BB, 1682 const char *Suffix) const { 1683 assert(BB->hasName() && 1684 "Address of anonymous basic block not supported yet!"); 1685 1686 // This code must use the function name itself, and not the function number, 1687 // since it must be possible to generate the label name from within other 1688 // functions. 1689 SmallString<60> FnName; 1690 Mang->getNameWithPrefix(FnName, F, false); 1691 1692 // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME! 1693 SmallString<60> NameResult; 1694 Mang->getNameWithPrefix(NameResult, 1695 StringRef("BA") + Twine((unsigned)FnName.size()) + 1696 "_" + FnName.str() + "_" + BB->getName() + Suffix, 1697 Mangler::Private); 1698 1699 return OutContext.GetOrCreateSymbol(NameResult.str()); 1700} 1701 1702MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const { 1703 SmallString<60> Name; 1704 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB" 1705 << getFunctionNumber() << '_' << MBBID; 1706 1707 return OutContext.GetOrCreateSymbol(Name.str()); 1708} 1709 1710/// GetGlobalValueSymbol - Return the MCSymbol for the specified global 1711/// value. 1712MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const { 1713 SmallString<60> NameStr; 1714 Mang->getNameWithPrefix(NameStr, GV, false); 1715 return OutContext.GetOrCreateSymbol(NameStr.str()); 1716} 1717 1718/// GetPrivateGlobalValueSymbolStub - Return the MCSymbol for a symbol with 1719/// global value name as its base, with the specified suffix, and where the 1720/// symbol is forced to have private linkage. 1721MCSymbol *AsmPrinter::GetPrivateGlobalValueSymbolStub(const GlobalValue *GV, 1722 StringRef Suffix) const { 1723 SmallString<60> NameStr; 1724 Mang->getNameWithPrefix(NameStr, GV, true); 1725 NameStr.append(Suffix.begin(), Suffix.end()); 1726 return OutContext.GetOrCreateSymbol(NameStr.str()); 1727} 1728 1729/// GetExternalSymbolSymbol - Return the MCSymbol for the specified 1730/// ExternalSymbol. 1731MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const { 1732 SmallString<60> NameStr; 1733 Mang->getNameWithPrefix(NameStr, Sym); 1734 return OutContext.GetOrCreateSymbol(NameStr.str()); 1735} 1736 1737 1738/// EmitBasicBlockStart - This method prints the label for the specified 1739/// MachineBasicBlock, an alignment (if present) and a comment describing 1740/// it if appropriate. 1741void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { 1742 // Emit an alignment directive for this block, if needed. 1743 if (unsigned Align = MBB->getAlignment()) 1744 EmitAlignment(Log2_32(Align)); 1745 1746 // If the block has its address taken, emit a special label to satisfy 1747 // references to the block. This is done so that we don't need to 1748 // remember the number of this label, and so that we can make 1749 // forward references to labels without knowing what their numbers 1750 // will be. 1751 if (MBB->hasAddressTaken()) { 1752 GetBlockAddressSymbol(MBB->getBasicBlock()->getParent(), 1753 MBB->getBasicBlock())->print(O, MAI); 1754 O << ':'; 1755 if (VerboseAsm) { 1756 O.PadToColumn(MAI->getCommentColumn()); 1757 O << MAI->getCommentString() << " Address Taken"; 1758 } 1759 O << '\n'; 1760 } 1761 1762 // Print the main label for the block. 1763 if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) { 1764 if (VerboseAsm) 1765 O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':'; 1766 } else { 1767 GetMBBSymbol(MBB->getNumber())->print(O, MAI); 1768 O << ':'; 1769 if (!VerboseAsm) 1770 O << '\n'; 1771 } 1772 1773 // Print some comments to accompany the label. 1774 if (VerboseAsm) { 1775 if (const BasicBlock *BB = MBB->getBasicBlock()) 1776 if (BB->hasName()) { 1777 O.PadToColumn(MAI->getCommentColumn()); 1778 O << MAI->getCommentString() << ' '; 1779 WriteAsOperand(O, BB, /*PrintType=*/false); 1780 } 1781 1782 EmitComments(*MBB); 1783 O << '\n'; 1784 } 1785} 1786 1787/// printPICJumpTableSetLabel - This method prints a set label for the 1788/// specified MachineBasicBlock for a jumptable entry. 1789void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, 1790 const MachineBasicBlock *MBB) const { 1791 if (!MAI->getSetDirective()) 1792 return; 1793 1794 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix() 1795 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','; 1796 GetMBBSymbol(MBB->getNumber())->print(O, MAI); 1797 O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1798 << '_' << uid << '\n'; 1799} 1800 1801void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2, 1802 const MachineBasicBlock *MBB) const { 1803 if (!MAI->getSetDirective()) 1804 return; 1805 1806 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix() 1807 << getFunctionNumber() << '_' << uid << '_' << uid2 1808 << "_set_" << MBB->getNumber() << ','; 1809 GetMBBSymbol(MBB->getNumber())->print(O, MAI); 1810 O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1811 << '_' << uid << '_' << uid2 << '\n'; 1812} 1813 1814/// printDataDirective - This method prints the asm directive for the 1815/// specified type. 1816void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) { 1817 const TargetData *TD = TM.getTargetData(); 1818 switch (type->getTypeID()) { 1819 case Type::FloatTyID: case Type::DoubleTyID: 1820 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID: 1821 assert(0 && "Should have already output floating point constant."); 1822 default: 1823 assert(0 && "Can't handle printing this type of thing"); 1824 case Type::IntegerTyID: { 1825 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth(); 1826 if (BitWidth <= 8) 1827 O << MAI->getData8bitsDirective(AddrSpace); 1828 else if (BitWidth <= 16) 1829 O << MAI->getData16bitsDirective(AddrSpace); 1830 else if (BitWidth <= 32) 1831 O << MAI->getData32bitsDirective(AddrSpace); 1832 else if (BitWidth <= 64) { 1833 assert(MAI->getData64bitsDirective(AddrSpace) && 1834 "Target cannot handle 64-bit constant exprs!"); 1835 O << MAI->getData64bitsDirective(AddrSpace); 1836 } else { 1837 llvm_unreachable("Target cannot handle given data directive width!"); 1838 } 1839 break; 1840 } 1841 case Type::PointerTyID: 1842 if (TD->getPointerSize() == 8) { 1843 assert(MAI->getData64bitsDirective(AddrSpace) && 1844 "Target cannot handle 64-bit pointer exprs!"); 1845 O << MAI->getData64bitsDirective(AddrSpace); 1846 } else if (TD->getPointerSize() == 2) { 1847 O << MAI->getData16bitsDirective(AddrSpace); 1848 } else if (TD->getPointerSize() == 1) { 1849 O << MAI->getData8bitsDirective(AddrSpace); 1850 } else { 1851 O << MAI->getData32bitsDirective(AddrSpace); 1852 } 1853 break; 1854 } 1855} 1856 1857void AsmPrinter::printVisibility(const MCSymbol *Sym, 1858 unsigned Visibility) const { 1859 if (Visibility == GlobalValue::HiddenVisibility) { 1860 if (const char *Directive = MAI->getHiddenDirective()) { 1861 O << Directive; 1862 Sym->print(O, MAI); 1863 O << '\n'; 1864 } 1865 } else if (Visibility == GlobalValue::ProtectedVisibility) { 1866 if (const char *Directive = MAI->getProtectedDirective()) { 1867 O << Directive; 1868 Sym->print(O, MAI); 1869 O << '\n'; 1870 } 1871 } 1872} 1873 1874void AsmPrinter::printOffset(int64_t Offset) const { 1875 if (Offset > 0) 1876 O << '+' << Offset; 1877 else if (Offset < 0) 1878 O << Offset; 1879} 1880 1881GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1882 if (!S->usesMetadata()) 1883 return 0; 1884 1885 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1886 if (GCPI != GCMetadataPrinters.end()) 1887 return GCPI->second; 1888 1889 const char *Name = S->getName().c_str(); 1890 1891 for (GCMetadataPrinterRegistry::iterator 1892 I = GCMetadataPrinterRegistry::begin(), 1893 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1894 if (strcmp(Name, I->getName()) == 0) { 1895 GCMetadataPrinter *GMP = I->instantiate(); 1896 GMP->S = S; 1897 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1898 return GMP; 1899 } 1900 1901 errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n"; 1902 llvm_unreachable(0); 1903} 1904 1905/// EmitComments - Pretty-print comments for instructions 1906void AsmPrinter::EmitComments(const MachineInstr &MI) const { 1907 if (!VerboseAsm) 1908 return; 1909 1910 bool Newline = false; 1911 1912 if (!MI.getDebugLoc().isUnknown()) { 1913 DILocation DLT = MF->getDILocation(MI.getDebugLoc()); 1914 1915 // Print source line info. 1916 O.PadToColumn(MAI->getCommentColumn()); 1917 O << MAI->getCommentString() << ' '; 1918 DIScope Scope = DLT.getScope(); 1919 // Omit the directory, because it's likely to be long and uninteresting. 1920 if (!Scope.isNull()) 1921 O << Scope.getFilename(); 1922 else 1923 O << "<unknown>"; 1924 O << ':' << DLT.getLineNumber(); 1925 if (DLT.getColumnNumber() != 0) 1926 O << ':' << DLT.getColumnNumber(); 1927 Newline = true; 1928 } 1929 1930 // Check for spills and reloads 1931 int FI; 1932 1933 const MachineFrameInfo *FrameInfo = 1934 MI.getParent()->getParent()->getFrameInfo(); 1935 1936 // We assume a single instruction only has a spill or reload, not 1937 // both. 1938 const MachineMemOperand *MMO; 1939 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) { 1940 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1941 MMO = *MI.memoperands_begin(); 1942 if (Newline) O << '\n'; 1943 O.PadToColumn(MAI->getCommentColumn()); 1944 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload"; 1945 Newline = true; 1946 } 1947 } 1948 else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) { 1949 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1950 if (Newline) O << '\n'; 1951 O.PadToColumn(MAI->getCommentColumn()); 1952 O << MAI->getCommentString() << ' ' 1953 << MMO->getSize() << "-byte Folded Reload"; 1954 Newline = true; 1955 } 1956 } 1957 else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) { 1958 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1959 MMO = *MI.memoperands_begin(); 1960 if (Newline) O << '\n'; 1961 O.PadToColumn(MAI->getCommentColumn()); 1962 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill"; 1963 Newline = true; 1964 } 1965 } 1966 else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) { 1967 if (FrameInfo->isSpillSlotObjectIndex(FI)) { 1968 if (Newline) O << '\n'; 1969 O.PadToColumn(MAI->getCommentColumn()); 1970 O << MAI->getCommentString() << ' ' 1971 << MMO->getSize() << "-byte Folded Spill"; 1972 Newline = true; 1973 } 1974 } 1975 1976 // Check for spill-induced copies 1977 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx; 1978 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg, 1979 SrcSubIdx, DstSubIdx)) { 1980 if (MI.getAsmPrinterFlag(ReloadReuse)) { 1981 if (Newline) O << '\n'; 1982 O.PadToColumn(MAI->getCommentColumn()); 1983 O << MAI->getCommentString() << " Reload Reuse"; 1984 } 1985 } 1986} 1987 1988/// PrintChildLoopComment - Print comments about child loops within 1989/// the loop for this basic block, with nesting. 1990/// 1991static void PrintChildLoopComment(formatted_raw_ostream &O, 1992 const MachineLoop *loop, 1993 const MCAsmInfo *MAI, 1994 int FunctionNumber) { 1995 // Add child loop information 1996 for(MachineLoop::iterator cl = loop->begin(), 1997 clend = loop->end(); 1998 cl != clend; 1999 ++cl) { 2000 MachineBasicBlock *Header = (*cl)->getHeader(); 2001 assert(Header && "No header for loop"); 2002 2003 O << '\n'; 2004 O.PadToColumn(MAI->getCommentColumn()); 2005 2006 O << MAI->getCommentString(); 2007 O.indent(((*cl)->getLoopDepth()-1)*2) 2008 << " Child Loop BB" << FunctionNumber << "_" 2009 << Header->getNumber() << " Depth " << (*cl)->getLoopDepth(); 2010 2011 PrintChildLoopComment(O, *cl, MAI, FunctionNumber); 2012 } 2013} 2014 2015/// EmitComments - Pretty-print comments for basic blocks 2016void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const { 2017 if (VerboseAsm) { 2018 // Add loop depth information 2019 const MachineLoop *loop = LI->getLoopFor(&MBB); 2020 2021 if (loop) { 2022 // Print a newline after bb# annotation. 2023 O << "\n"; 2024 O.PadToColumn(MAI->getCommentColumn()); 2025 O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth() 2026 << '\n'; 2027 2028 O.PadToColumn(MAI->getCommentColumn()); 2029 2030 MachineBasicBlock *Header = loop->getHeader(); 2031 assert(Header && "No header for loop"); 2032 2033 if (Header == &MBB) { 2034 O << MAI->getCommentString() << " Loop Header"; 2035 PrintChildLoopComment(O, loop, MAI, getFunctionNumber()); 2036 } 2037 else { 2038 O << MAI->getCommentString() << " Loop Header is BB" 2039 << getFunctionNumber() << "_" << loop->getHeader()->getNumber(); 2040 } 2041 2042 if (loop->empty()) { 2043 O << '\n'; 2044 O.PadToColumn(MAI->getCommentColumn()); 2045 O << MAI->getCommentString() << " Inner Loop"; 2046 } 2047 2048 // Add parent loop information 2049 for (const MachineLoop *CurLoop = loop->getParentLoop(); 2050 CurLoop; 2051 CurLoop = CurLoop->getParentLoop()) { 2052 MachineBasicBlock *Header = CurLoop->getHeader(); 2053 assert(Header && "No header for loop"); 2054 2055 O << '\n'; 2056 O.PadToColumn(MAI->getCommentColumn()); 2057 O << MAI->getCommentString(); 2058 O.indent((CurLoop->getLoopDepth()-1)*2) 2059 << " Inside Loop BB" << getFunctionNumber() << "_" 2060 << Header->getNumber() << " Depth " << CurLoop->getLoopDepth(); 2061 } 2062 } 2063 } 2064} 2065