AsmPrinter.cpp revision d68f13bf716faa496767a21140fab558adddc19a
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/MachineJumpTableInfo.h" 22#include "llvm/CodeGen/MachineModuleInfo.h" 23#include "llvm/Support/Mangler.h" 24#include "llvm/Support/raw_ostream.h" 25#include "llvm/Target/TargetAsmInfo.h" 26#include "llvm/Target/TargetData.h" 27#include "llvm/Target/TargetLowering.h" 28#include "llvm/Target/TargetMachine.h" 29#include "llvm/Target/TargetOptions.h" 30#include "llvm/Target/TargetRegisterInfo.h" 31#include "llvm/ADT/SmallPtrSet.h" 32#include "llvm/ADT/SmallString.h" 33#include "llvm/ADT/StringExtras.h" 34#include <cerrno> 35using namespace llvm; 36 37char AsmPrinter::ID = 0; 38AsmPrinter::AsmPrinter(raw_ostream &o, TargetMachine &tm, 39 const TargetAsmInfo *T) 40 : MachineFunctionPass(&ID), FunctionNumber(0), O(o), 41 TM(tm), TAI(T), TRI(tm.getRegisterInfo()), 42 IsInTextSection(false) 43{} 44 45AsmPrinter::~AsmPrinter() { 46 for (gcp_iterator I = GCMetadataPrinters.begin(), 47 E = GCMetadataPrinters.end(); I != E; ++I) 48 delete I->second; 49} 50 51/// SwitchToTextSection - Switch to the specified text section of the executable 52/// if we are not already in it! 53/// 54void AsmPrinter::SwitchToTextSection(const char *NewSection, 55 const GlobalValue *GV) { 56 std::string NS; 57 if (GV && GV->hasSection()) 58 NS = TAI->getSwitchToSectionDirective() + GV->getSection(); 59 else 60 NS = NewSection; 61 62 // If we're already in this section, we're done. 63 if (CurrentSection == NS) return; 64 65 // Close the current section, if applicable. 66 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) 67 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; 68 69 CurrentSection = NS; 70 71 if (!CurrentSection.empty()) 72 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n'; 73 74 IsInTextSection = true; 75} 76 77/// SwitchToDataSection - Switch to the specified data section of the executable 78/// if we are not already in it! 79/// 80void AsmPrinter::SwitchToDataSection(const char *NewSection, 81 const GlobalValue *GV) { 82 std::string NS; 83 if (GV && GV->hasSection()) 84 NS = TAI->getSwitchToSectionDirective() + GV->getSection(); 85 else 86 NS = NewSection; 87 88 // If we're already in this section, we're done. 89 if (CurrentSection == NS) return; 90 91 // Close the current section, if applicable. 92 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) 93 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; 94 95 CurrentSection = NS; 96 97 if (!CurrentSection.empty()) 98 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n'; 99 100 IsInTextSection = false; 101} 102 103/// SwitchToSection - Switch to the specified section of the executable if we 104/// are not already in it! 105void AsmPrinter::SwitchToSection(const Section* NS) { 106 const std::string& NewSection = NS->getName(); 107 108 // If we're already in this section, we're done. 109 if (CurrentSection == NewSection) return; 110 111 // Close the current section, if applicable. 112 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) 113 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; 114 115 // FIXME: Make CurrentSection a Section* in the future 116 CurrentSection = NewSection; 117 CurrentSection_ = NS; 118 119 if (!CurrentSection.empty()) { 120 // If section is named we need to switch into it via special '.section' 121 // directive and also append funky flags. Otherwise - section name is just 122 // some magic assembler directive. 123 if (NS->isNamed()) 124 O << TAI->getSwitchToSectionDirective() 125 << CurrentSection 126 << TAI->getSectionFlags(NS->getFlags()); 127 else 128 O << CurrentSection; 129 O << TAI->getDataSectionStartSuffix() << '\n'; 130 } 131 132 IsInTextSection = (NS->getFlags() & SectionFlags::Code); 133} 134 135void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { 136 MachineFunctionPass::getAnalysisUsage(AU); 137 AU.addRequired<GCModuleInfo>(); 138} 139 140bool AsmPrinter::doInitialization(Module &M) { 141 Mang = new Mangler(M, TAI->getGlobalPrefix()); 142 143 GCModuleInfo *MI = getAnalysisToUpdate<GCModuleInfo>(); 144 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 145 146 if (TAI->hasSingleParameterDotFile()) { 147 /* Very minimal debug info. It is ignored if we emit actual 148 debug info. If we don't, this at helps the user find where 149 a function came from. */ 150 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n"; 151 } 152 153 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 154 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 155 MP->beginAssembly(O, *this, *TAI); 156 157 if (!M.getModuleInlineAsm().empty()) 158 O << TAI->getCommentString() << " Start of file scope inline assembly\n" 159 << M.getModuleInlineAsm() 160 << '\n' << TAI->getCommentString() 161 << " End of file scope inline assembly\n"; 162 163 SwitchToDataSection(""); // Reset back to no section. 164 165 MMI = getAnalysisToUpdate<MachineModuleInfo>(); 166 if (MMI) MMI->AnalyzeModule(M); 167 168 return false; 169} 170 171bool AsmPrinter::doFinalization(Module &M) { 172 if (TAI->getWeakRefDirective()) { 173 if (!ExtWeakSymbols.empty()) 174 SwitchToDataSection(""); 175 176 for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(), 177 e = ExtWeakSymbols.end(); i != e; ++i) { 178 const GlobalValue *GV = *i; 179 std::string Name = Mang->getValueName(GV); 180 O << TAI->getWeakRefDirective() << Name << '\n'; 181 } 182 } 183 184 if (TAI->getSetDirective()) { 185 if (!M.alias_empty()) 186 SwitchToSection(TAI->getTextSection()); 187 188 O << '\n'; 189 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 190 I!=E; ++I) { 191 std::string Name = Mang->getValueName(I); 192 std::string Target; 193 194 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 195 Target = Mang->getValueName(GV); 196 197 if (I->hasExternalLinkage() || !TAI->getWeakRefDirective()) 198 O << "\t.globl\t" << Name << '\n'; 199 else if (I->hasWeakLinkage()) 200 O << TAI->getWeakRefDirective() << Name << '\n'; 201 else if (!I->hasInternalLinkage()) 202 assert(0 && "Invalid alias linkage"); 203 204 printVisibility(Name, I->getVisibility()); 205 206 O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n'; 207 208 // If the aliasee has external weak linkage it can be referenced only by 209 // alias itself. In this case it can be not in ExtWeakSymbols list. Emit 210 // weak reference in such case. 211 if (GV->hasExternalWeakLinkage()) { 212 if (TAI->getWeakRefDirective()) 213 O << TAI->getWeakRefDirective() << Target << '\n'; 214 else 215 O << "\t.globl\t" << Target << '\n'; 216 } 217 } 218 } 219 220 GCModuleInfo *MI = getAnalysisToUpdate<GCModuleInfo>(); 221 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 222 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 223 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 224 MP->finishAssembly(O, *this, *TAI); 225 226 // If we don't have any trampolines, then we don't require stack memory 227 // to be executable. Some targets have a directive to declare this. 228 Function* InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 229 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 230 if (TAI->getNonexecutableStackDirective()) 231 O << TAI->getNonexecutableStackDirective() << '\n'; 232 233 delete Mang; Mang = 0; 234 return false; 235} 236 237std::string AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) { 238 assert(MF && "No machine function?"); 239 std::string Name = MF->getFunction()->getName(); 240 if (Name.empty()) 241 Name = Mang->getValueName(MF->getFunction()); 242 return Mang->makeNameProper(TAI->getEHGlobalPrefix() + 243 Name + ".eh", TAI->getGlobalPrefix()); 244} 245 246void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 247 // What's my mangled name? 248 CurrentFnName = Mang->getValueName(MF.getFunction()); 249 IncrementFunctionNumber(); 250} 251 252/// EmitConstantPool - Print to the current output stream assembly 253/// representations of the constants in the constant pool MCP. This is 254/// used to print out constants which have been "spilled to memory" by 255/// the code generator. 256/// 257void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) { 258 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 259 if (CP.empty()) return; 260 261 // Calculate sections for constant pool entries. We collect entries to go into 262 // the same section together to reduce amount of section switch statements. 263 typedef 264 std::multimap<const Section*, 265 std::pair<MachineConstantPoolEntry, unsigned> > CPMap; 266 CPMap CPs; 267 SmallPtrSet<const Section*, 5> Sections; 268 269 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 270 MachineConstantPoolEntry CPE = CP[i]; 271 const Section* S = TAI->SelectSectionForMachineConst(CPE.getType()); 272 CPs.insert(std::make_pair(S, std::make_pair(CPE, i))); 273 Sections.insert(S); 274 } 275 276 // Now print stuff into the calculated sections. 277 for (SmallPtrSet<const Section*, 5>::iterator IS = Sections.begin(), 278 ES = Sections.end(); IS != ES; ++IS) { 279 SwitchToSection(*IS); 280 EmitAlignment(MCP->getConstantPoolAlignment()); 281 282 std::pair<CPMap::iterator, CPMap::iterator> II = CPs.equal_range(*IS); 283 for (CPMap::iterator I = II.first, E = II.second; I != E; ++I) { 284 CPMap::iterator J = next(I); 285 MachineConstantPoolEntry Entry = I->second.first; 286 unsigned index = I->second.second; 287 288 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' 289 << index << ":\t\t\t\t\t"; 290 // O << TAI->getCommentString() << ' ' << 291 // WriteTypeSymbolic(O, CP[i].first.getType(), 0); 292 O << '\n'; 293 if (Entry.isMachineConstantPoolEntry()) 294 EmitMachineConstantPoolValue(Entry.Val.MachineCPVal); 295 else 296 EmitGlobalConstant(Entry.Val.ConstVal); 297 298 // Emit inter-object padding for alignment. 299 if (J != E) { 300 const Type *Ty = Entry.getType(); 301 unsigned EntSize = TM.getTargetData()->getTypePaddedSize(Ty); 302 unsigned ValEnd = Entry.getOffset() + EntSize; 303 EmitZeros(J->second.first.getOffset()-ValEnd); 304 } 305 } 306 } 307} 308 309/// EmitJumpTableInfo - Print assembly representations of the jump tables used 310/// by the current function to the current output stream. 311/// 312void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI, 313 MachineFunction &MF) { 314 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 315 if (JT.empty()) return; 316 317 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 318 319 // Pick the directive to use to print the jump table entries, and switch to 320 // the appropriate section. 321 TargetLowering *LoweringInfo = TM.getTargetLowering(); 322 323 const char* JumpTableDataSection = TAI->getJumpTableDataSection(); 324 const Function *F = MF.getFunction(); 325 unsigned SectionFlags = TAI->SectionFlagsForGlobal(F); 326 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) || 327 !JumpTableDataSection || 328 SectionFlags & SectionFlags::Linkonce) { 329 // In PIC mode, we need to emit the jump table to the same section as the 330 // function body itself, otherwise the label differences won't make sense. 331 // We should also do if the section name is NULL or function is declared in 332 // discardable section. 333 SwitchToSection(TAI->SectionForGlobal(F)); 334 } else { 335 SwitchToDataSection(JumpTableDataSection); 336 } 337 338 EmitAlignment(Log2_32(MJTI->getAlignment())); 339 340 for (unsigned i = 0, e = JT.size(); i != e; ++i) { 341 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; 342 343 // If this jump table was deleted, ignore it. 344 if (JTBBs.empty()) continue; 345 346 // For PIC codegen, if possible we want to use the SetDirective to reduce 347 // the number of relocations the assembler will generate for the jump table. 348 // Set directives are all printed before the jump table itself. 349 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; 350 if (TAI->getSetDirective() && IsPic) 351 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 352 if (EmittedSets.insert(JTBBs[ii])) 353 printPICJumpTableSetLabel(i, JTBBs[ii]); 354 355 // On some targets (e.g. darwin) we want to emit two consequtive labels 356 // before each jump table. The first label is never referenced, but tells 357 // the assembler and linker the extents of the jump table object. The 358 // second label is actually referenced by the code. 359 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix()) 360 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n"; 361 362 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 363 << '_' << i << ":\n"; 364 365 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 366 printPICJumpTableEntry(MJTI, JTBBs[ii], i); 367 O << '\n'; 368 } 369 } 370} 371 372void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, 373 const MachineBasicBlock *MBB, 374 unsigned uid) const { 375 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 376 377 // Use JumpTableDirective otherwise honor the entry size from the jump table 378 // info. 379 const char *JTEntryDirective = TAI->getJumpTableDirective(); 380 bool HadJTEntryDirective = JTEntryDirective != NULL; 381 if (!HadJTEntryDirective) { 382 JTEntryDirective = MJTI->getEntrySize() == 4 ? 383 TAI->getData32bitsDirective() : TAI->getData64bitsDirective(); 384 } 385 386 O << JTEntryDirective << ' '; 387 388 // If we have emitted set directives for the jump table entries, print 389 // them rather than the entries themselves. If we're emitting PIC, then 390 // emit the table entries as differences between two text section labels. 391 // If we're emitting non-PIC code, then emit the entries as direct 392 // references to the target basic blocks. 393 if (IsPic) { 394 if (TAI->getSetDirective()) { 395 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber() 396 << '_' << uid << "_set_" << MBB->getNumber(); 397 } else { 398 printBasicBlockLabel(MBB, false, false, false); 399 // If the arch uses custom Jump Table directives, don't calc relative to 400 // JT 401 if (!HadJTEntryDirective) 402 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" 403 << getFunctionNumber() << '_' << uid; 404 } 405 } else { 406 printBasicBlockLabel(MBB, false, false, false); 407 } 408} 409 410 411/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 412/// special global used by LLVM. If so, emit it and return true, otherwise 413/// do nothing and return false. 414bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 415 if (GV->getName() == "llvm.used") { 416 if (TAI->getUsedDirective() != 0) // No need to emit this at all. 417 EmitLLVMUsedList(GV->getInitializer()); 418 return true; 419 } 420 421 // Ignore debug and non-emitted data. 422 if (GV->getSection() == "llvm.metadata") return true; 423 424 if (!GV->hasAppendingLinkage()) return false; 425 426 assert(GV->hasInitializer() && "Not a special LLVM global!"); 427 428 const TargetData *TD = TM.getTargetData(); 429 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 430 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) { 431 SwitchToDataSection(TAI->getStaticCtorsSection()); 432 EmitAlignment(Align, 0); 433 EmitXXStructorList(GV->getInitializer()); 434 return true; 435 } 436 437 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) { 438 SwitchToDataSection(TAI->getStaticDtorsSection()); 439 EmitAlignment(Align, 0); 440 EmitXXStructorList(GV->getInitializer()); 441 return true; 442 } 443 444 return false; 445} 446 447/// findGlobalValue - if CV is an expression equivalent to a single 448/// global value, return that value. 449const GlobalValue * AsmPrinter::findGlobalValue(const Constant *CV) { 450 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) 451 return GV; 452 else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { 453 const TargetData *TD = TM.getTargetData(); 454 unsigned Opcode = CE->getOpcode(); 455 switch (Opcode) { 456 case Instruction::GetElementPtr: { 457 const Constant *ptrVal = CE->getOperand(0); 458 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 459 if (TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], idxVec.size())) 460 return 0; 461 return findGlobalValue(ptrVal); 462 } 463 case Instruction::BitCast: 464 return findGlobalValue(CE->getOperand(0)); 465 default: 466 return 0; 467 } 468 } 469 return 0; 470} 471 472/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each 473/// global in the specified llvm.used list for which emitUsedDirectiveFor 474/// is true, as being used with this directive. 475 476void AsmPrinter::EmitLLVMUsedList(Constant *List) { 477 const char *Directive = TAI->getUsedDirective(); 478 479 // Should be an array of 'sbyte*'. 480 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 481 if (InitList == 0) return; 482 483 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 484 const GlobalValue *GV = findGlobalValue(InitList->getOperand(i)); 485 if (TAI->emitUsedDirectiveFor(GV, Mang)) { 486 O << Directive; 487 EmitConstantValueOnly(InitList->getOperand(i)); 488 O << '\n'; 489 } 490 } 491} 492 493/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 494/// function pointers, ignoring the init priority. 495void AsmPrinter::EmitXXStructorList(Constant *List) { 496 // Should be an array of '{ int, void ()* }' structs. The first value is the 497 // init priority, which we ignore. 498 if (!isa<ConstantArray>(List)) return; 499 ConstantArray *InitList = cast<ConstantArray>(List); 500 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 501 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 502 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 503 504 if (CS->getOperand(1)->isNullValue()) 505 return; // Found a null terminator, exit printing. 506 // Emit the function pointer. 507 EmitGlobalConstant(CS->getOperand(1)); 508 } 509} 510 511/// getGlobalLinkName - Returns the asm/link name of of the specified 512/// global variable. Should be overridden by each target asm printer to 513/// generate the appropriate value. 514const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{ 515 std::string LinkName; 516 517 if (isa<Function>(GV)) { 518 LinkName += TAI->getFunctionAddrPrefix(); 519 LinkName += Mang->getValueName(GV); 520 LinkName += TAI->getFunctionAddrSuffix(); 521 } else { 522 LinkName += TAI->getGlobalVarAddrPrefix(); 523 LinkName += Mang->getValueName(GV); 524 LinkName += TAI->getGlobalVarAddrSuffix(); 525 } 526 527 return LinkName; 528} 529 530/// EmitExternalGlobal - Emit the external reference to a global variable. 531/// Should be overridden if an indirect reference should be used. 532void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) { 533 O << getGlobalLinkName(GV); 534} 535 536 537 538//===----------------------------------------------------------------------===// 539/// LEB 128 number encoding. 540 541/// PrintULEB128 - Print a series of hexidecimal values (separated by commas) 542/// representing an unsigned leb128 value. 543void AsmPrinter::PrintULEB128(unsigned Value) const { 544 char Buffer[20]; 545 do { 546 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 547 Value >>= 7; 548 if (Value) Byte |= 0x80; 549 O << "0x" << utohex_buffer(Byte, Buffer+20); 550 if (Value) O << ", "; 551 } while (Value); 552} 553 554/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas) 555/// representing a signed leb128 value. 556void AsmPrinter::PrintSLEB128(int Value) const { 557 int Sign = Value >> (8 * sizeof(Value) - 1); 558 bool IsMore; 559 char Buffer[20]; 560 561 do { 562 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 563 Value >>= 7; 564 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; 565 if (IsMore) Byte |= 0x80; 566 O << "0x" << utohex_buffer(Byte, Buffer+20); 567 if (IsMore) O << ", "; 568 } while (IsMore); 569} 570 571//===--------------------------------------------------------------------===// 572// Emission and print routines 573// 574 575/// PrintHex - Print a value as a hexidecimal value. 576/// 577void AsmPrinter::PrintHex(int Value) const { 578 char Buffer[20]; 579 O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20); 580} 581 582/// EOL - Print a newline character to asm stream. If a comment is present 583/// then it will be printed first. Comments should not contain '\n'. 584void AsmPrinter::EOL() const { 585 O << '\n'; 586} 587 588void AsmPrinter::EOL(const std::string &Comment) const { 589 if (VerboseAsm && !Comment.empty()) { 590 O << '\t' 591 << TAI->getCommentString() 592 << ' ' 593 << Comment; 594 } 595 O << '\n'; 596} 597 598void AsmPrinter::EOL(const char* Comment) const { 599 if (VerboseAsm && *Comment) { 600 O << '\t' 601 << TAI->getCommentString() 602 << ' ' 603 << Comment; 604 } 605 O << '\n'; 606} 607 608/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an 609/// unsigned leb128 value. 610void AsmPrinter::EmitULEB128Bytes(unsigned Value) const { 611 if (TAI->hasLEB128()) { 612 O << "\t.uleb128\t" 613 << Value; 614 } else { 615 O << TAI->getData8bitsDirective(); 616 PrintULEB128(Value); 617 } 618} 619 620/// EmitSLEB128Bytes - print an assembler byte data directive to compose a 621/// signed leb128 value. 622void AsmPrinter::EmitSLEB128Bytes(int Value) const { 623 if (TAI->hasLEB128()) { 624 O << "\t.sleb128\t" 625 << Value; 626 } else { 627 O << TAI->getData8bitsDirective(); 628 PrintSLEB128(Value); 629 } 630} 631 632/// EmitInt8 - Emit a byte directive and value. 633/// 634void AsmPrinter::EmitInt8(int Value) const { 635 O << TAI->getData8bitsDirective(); 636 PrintHex(Value & 0xFF); 637} 638 639/// EmitInt16 - Emit a short directive and value. 640/// 641void AsmPrinter::EmitInt16(int Value) const { 642 O << TAI->getData16bitsDirective(); 643 PrintHex(Value & 0xFFFF); 644} 645 646/// EmitInt32 - Emit a long directive and value. 647/// 648void AsmPrinter::EmitInt32(int Value) const { 649 O << TAI->getData32bitsDirective(); 650 PrintHex(Value); 651} 652 653/// EmitInt64 - Emit a long long directive and value. 654/// 655void AsmPrinter::EmitInt64(uint64_t Value) const { 656 if (TAI->getData64bitsDirective()) { 657 O << TAI->getData64bitsDirective(); 658 PrintHex(Value); 659 } else { 660 if (TM.getTargetData()->isBigEndian()) { 661 EmitInt32(unsigned(Value >> 32)); O << '\n'; 662 EmitInt32(unsigned(Value)); 663 } else { 664 EmitInt32(unsigned(Value)); O << '\n'; 665 EmitInt32(unsigned(Value >> 32)); 666 } 667 } 668} 669 670/// toOctal - Convert the low order bits of X into an octal digit. 671/// 672static inline char toOctal(int X) { 673 return (X&7)+'0'; 674} 675 676/// printStringChar - Print a char, escaped if necessary. 677/// 678static void printStringChar(raw_ostream &O, char C) { 679 if (C == '"') { 680 O << "\\\""; 681 } else if (C == '\\') { 682 O << "\\\\"; 683 } else if (isprint(C)) { 684 O << C; 685 } else { 686 switch(C) { 687 case '\b': O << "\\b"; break; 688 case '\f': O << "\\f"; break; 689 case '\n': O << "\\n"; break; 690 case '\r': O << "\\r"; break; 691 case '\t': O << "\\t"; break; 692 default: 693 O << '\\'; 694 O << toOctal(C >> 6); 695 O << toOctal(C >> 3); 696 O << toOctal(C >> 0); 697 break; 698 } 699 } 700} 701 702/// EmitString - Emit a string with quotes and a null terminator. 703/// Special characters are emitted properly. 704/// \literal (Eg. '\t') \endliteral 705void AsmPrinter::EmitString(const std::string &String) const { 706 const char* AscizDirective = TAI->getAscizDirective(); 707 if (AscizDirective) 708 O << AscizDirective; 709 else 710 O << TAI->getAsciiDirective(); 711 O << '\"'; 712 for (unsigned i = 0, N = String.size(); i < N; ++i) { 713 unsigned char C = String[i]; 714 printStringChar(O, C); 715 } 716 if (AscizDirective) 717 O << '\"'; 718 else 719 O << "\\0\""; 720} 721 722 723/// EmitFile - Emit a .file directive. 724void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const { 725 O << "\t.file\t" << Number << " \""; 726 for (unsigned i = 0, N = Name.size(); i < N; ++i) { 727 unsigned char C = Name[i]; 728 printStringChar(O, C); 729 } 730 O << '\"'; 731} 732 733 734//===----------------------------------------------------------------------===// 735 736// EmitAlignment - Emit an alignment directive to the specified power of 737// two boundary. For example, if you pass in 3 here, you will get an 8 738// byte alignment. If a global value is specified, and if that global has 739// an explicit alignment requested, it will unconditionally override the 740// alignment request. However, if ForcedAlignBits is specified, this value 741// has final say: the ultimate alignment will be the max of ForcedAlignBits 742// and the alignment computed with NumBits and the global. 743// 744// The algorithm is: 745// Align = NumBits; 746// if (GV && GV->hasalignment) Align = GV->getalignment(); 747// Align = std::max(Align, ForcedAlignBits); 748// 749void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 750 unsigned ForcedAlignBits, 751 bool UseFillExpr) const { 752 if (GV && GV->getAlignment()) 753 NumBits = Log2_32(GV->getAlignment()); 754 NumBits = std::max(NumBits, ForcedAlignBits); 755 756 if (NumBits == 0) return; // No need to emit alignment. 757 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits; 758 O << TAI->getAlignDirective() << NumBits; 759 760 unsigned FillValue = TAI->getTextAlignFillValue(); 761 UseFillExpr &= IsInTextSection && FillValue; 762 if (UseFillExpr) { 763 O << ','; 764 PrintHex(FillValue); 765 } 766 O << '\n'; 767} 768 769 770/// EmitZeros - Emit a block of zeros. 771/// 772void AsmPrinter::EmitZeros(uint64_t NumZeros) const { 773 if (NumZeros) { 774 if (TAI->getZeroDirective()) { 775 O << TAI->getZeroDirective() << NumZeros; 776 if (TAI->getZeroDirectiveSuffix()) 777 O << TAI->getZeroDirectiveSuffix(); 778 O << '\n'; 779 } else { 780 for (; NumZeros; --NumZeros) 781 O << TAI->getData8bitsDirective() << "0\n"; 782 } 783 } 784} 785 786// Print out the specified constant, without a storage class. Only the 787// constants valid in constant expressions can occur here. 788void AsmPrinter::EmitConstantValueOnly(const Constant *CV) { 789 if (CV->isNullValue() || isa<UndefValue>(CV)) 790 O << '0'; 791 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 792 O << CI->getZExtValue(); 793 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) { 794 // This is a constant address for a global variable or function. Use the 795 // name of the variable or function as the address value, possibly 796 // decorating it with GlobalVarAddrPrefix/Suffix or 797 // FunctionAddrPrefix/Suffix (these all default to "" ) 798 if (isa<Function>(GV)) { 799 O << TAI->getFunctionAddrPrefix() 800 << Mang->getValueName(GV) 801 << TAI->getFunctionAddrSuffix(); 802 } else { 803 O << TAI->getGlobalVarAddrPrefix() 804 << Mang->getValueName(GV) 805 << TAI->getGlobalVarAddrSuffix(); 806 } 807 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { 808 const TargetData *TD = TM.getTargetData(); 809 unsigned Opcode = CE->getOpcode(); 810 switch (Opcode) { 811 case Instruction::GetElementPtr: { 812 // generate a symbolic expression for the byte address 813 const Constant *ptrVal = CE->getOperand(0); 814 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 815 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], 816 idxVec.size())) { 817 if (Offset) 818 O << '('; 819 EmitConstantValueOnly(ptrVal); 820 if (Offset > 0) 821 O << ") + " << Offset; 822 else if (Offset < 0) 823 O << ") - " << -Offset; 824 } else { 825 EmitConstantValueOnly(ptrVal); 826 } 827 break; 828 } 829 case Instruction::Trunc: 830 case Instruction::ZExt: 831 case Instruction::SExt: 832 case Instruction::FPTrunc: 833 case Instruction::FPExt: 834 case Instruction::UIToFP: 835 case Instruction::SIToFP: 836 case Instruction::FPToUI: 837 case Instruction::FPToSI: 838 assert(0 && "FIXME: Don't yet support this kind of constant cast expr"); 839 break; 840 case Instruction::BitCast: 841 return EmitConstantValueOnly(CE->getOperand(0)); 842 843 case Instruction::IntToPtr: { 844 // Handle casts to pointers by changing them into casts to the appropriate 845 // integer type. This promotes constant folding and simplifies this code. 846 Constant *Op = CE->getOperand(0); 847 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/); 848 return EmitConstantValueOnly(Op); 849 } 850 851 852 case Instruction::PtrToInt: { 853 // Support only foldable casts to/from pointers that can be eliminated by 854 // changing the pointer to the appropriately sized integer type. 855 Constant *Op = CE->getOperand(0); 856 const Type *Ty = CE->getType(); 857 858 // We can emit the pointer value into this slot if the slot is an 859 // integer slot greater or equal to the size of the pointer. 860 if (TD->getTypePaddedSize(Ty) >= TD->getTypePaddedSize(Op->getType())) 861 return EmitConstantValueOnly(Op); 862 863 O << "(("; 864 EmitConstantValueOnly(Op); 865 APInt ptrMask = APInt::getAllOnesValue(TD->getTypePaddedSizeInBits(Ty)); 866 867 SmallString<40> S; 868 ptrMask.toStringUnsigned(S); 869 O << ") & " << S.c_str() << ')'; 870 break; 871 } 872 case Instruction::Add: 873 case Instruction::Sub: 874 case Instruction::And: 875 case Instruction::Or: 876 case Instruction::Xor: 877 O << '('; 878 EmitConstantValueOnly(CE->getOperand(0)); 879 O << ')'; 880 switch (Opcode) { 881 case Instruction::Add: 882 O << " + "; 883 break; 884 case Instruction::Sub: 885 O << " - "; 886 break; 887 case Instruction::And: 888 O << " & "; 889 break; 890 case Instruction::Or: 891 O << " | "; 892 break; 893 case Instruction::Xor: 894 O << " ^ "; 895 break; 896 default: 897 break; 898 } 899 O << '('; 900 EmitConstantValueOnly(CE->getOperand(1)); 901 O << ')'; 902 break; 903 default: 904 assert(0 && "Unsupported operator!"); 905 } 906 } else { 907 assert(0 && "Unknown constant value!"); 908 } 909} 910 911/// printAsCString - Print the specified array as a C compatible string, only if 912/// the predicate isString is true. 913/// 914static void printAsCString(raw_ostream &O, const ConstantArray *CVA, 915 unsigned LastElt) { 916 assert(CVA->isString() && "Array is not string compatible!"); 917 918 O << '\"'; 919 for (unsigned i = 0; i != LastElt; ++i) { 920 unsigned char C = 921 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue(); 922 printStringChar(O, C); 923 } 924 O << '\"'; 925} 926 927/// EmitString - Emit a zero-byte-terminated string constant. 928/// 929void AsmPrinter::EmitString(const ConstantArray *CVA) const { 930 unsigned NumElts = CVA->getNumOperands(); 931 if (TAI->getAscizDirective() && NumElts && 932 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) { 933 O << TAI->getAscizDirective(); 934 printAsCString(O, CVA, NumElts-1); 935 } else { 936 O << TAI->getAsciiDirective(); 937 printAsCString(O, CVA, NumElts); 938 } 939 O << '\n'; 940} 941 942void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA) { 943 if (CVA->isString()) { 944 EmitString(CVA); 945 } else { // Not a string. Print the values in successive locations 946 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) 947 EmitGlobalConstant(CVA->getOperand(i)); 948 } 949} 950 951void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) { 952 const VectorType *PTy = CP->getType(); 953 954 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I) 955 EmitGlobalConstant(CP->getOperand(I)); 956} 957 958void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS) { 959 // Print the fields in successive locations. Pad to align if needed! 960 const TargetData *TD = TM.getTargetData(); 961 unsigned Size = TD->getTypePaddedSize(CVS->getType()); 962 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType()); 963 uint64_t sizeSoFar = 0; 964 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) { 965 const Constant* field = CVS->getOperand(i); 966 967 // Check if padding is needed and insert one or more 0s. 968 uint64_t fieldSize = TD->getTypePaddedSize(field->getType()); 969 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1)) 970 - cvsLayout->getElementOffset(i)) - fieldSize; 971 sizeSoFar += fieldSize + padSize; 972 973 // Now print the actual field value. 974 EmitGlobalConstant(field); 975 976 // Insert padding - this may include padding to increase the size of the 977 // current field up to the ABI size (if the struct is not packed) as well 978 // as padding to ensure that the next field starts at the right offset. 979 EmitZeros(padSize); 980 } 981 assert(sizeSoFar == cvsLayout->getSizeInBytes() && 982 "Layout of constant struct may be incorrect!"); 983} 984 985void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP) { 986 // FP Constants are printed as integer constants to avoid losing 987 // precision... 988 const TargetData *TD = TM.getTargetData(); 989 if (CFP->getType() == Type::DoubleTy) { 990 double Val = CFP->getValueAPF().convertToDouble(); // for comment only 991 uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 992 if (TAI->getData64bitsDirective()) 993 O << TAI->getData64bitsDirective() << i << '\t' 994 << TAI->getCommentString() << " double value: " << Val << '\n'; 995 else if (TD->isBigEndian()) { 996 O << TAI->getData32bitsDirective() << unsigned(i >> 32) 997 << '\t' << TAI->getCommentString() 998 << " double most significant word " << Val << '\n'; 999 O << TAI->getData32bitsDirective() << unsigned(i) 1000 << '\t' << TAI->getCommentString() 1001 << " double least significant word " << Val << '\n'; 1002 } else { 1003 O << TAI->getData32bitsDirective() << unsigned(i) 1004 << '\t' << TAI->getCommentString() 1005 << " double least significant word " << Val << '\n'; 1006 O << TAI->getData32bitsDirective() << unsigned(i >> 32) 1007 << '\t' << TAI->getCommentString() 1008 << " double most significant word " << Val << '\n'; 1009 } 1010 return; 1011 } else if (CFP->getType() == Type::FloatTy) { 1012 float Val = CFP->getValueAPF().convertToFloat(); // for comment only 1013 O << TAI->getData32bitsDirective() 1014 << CFP->getValueAPF().bitcastToAPInt().getZExtValue() 1015 << '\t' << TAI->getCommentString() << " float " << Val << '\n'; 1016 return; 1017 } else if (CFP->getType() == Type::X86_FP80Ty) { 1018 // all long double variants are printed as hex 1019 // api needed to prevent premature destruction 1020 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1021 const uint64_t *p = api.getRawData(); 1022 // Convert to double so we can print the approximate val as a comment. 1023 APFloat DoubleVal = CFP->getValueAPF(); 1024 bool ignored; 1025 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 1026 &ignored); 1027 if (TD->isBigEndian()) { 1028 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48) 1029 << '\t' << TAI->getCommentString() 1030 << " long double most significant halfword of ~" 1031 << DoubleVal.convertToDouble() << '\n'; 1032 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32) 1033 << '\t' << TAI->getCommentString() 1034 << " long double next halfword\n"; 1035 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16) 1036 << '\t' << TAI->getCommentString() 1037 << " long double next halfword\n"; 1038 O << TAI->getData16bitsDirective() << uint16_t(p[0]) 1039 << '\t' << TAI->getCommentString() 1040 << " long double next halfword\n"; 1041 O << TAI->getData16bitsDirective() << uint16_t(p[1]) 1042 << '\t' << TAI->getCommentString() 1043 << " long double least significant halfword\n"; 1044 } else { 1045 O << TAI->getData16bitsDirective() << uint16_t(p[1]) 1046 << '\t' << TAI->getCommentString() 1047 << " long double least significant halfword of ~" 1048 << DoubleVal.convertToDouble() << '\n'; 1049 O << TAI->getData16bitsDirective() << uint16_t(p[0]) 1050 << '\t' << TAI->getCommentString() 1051 << " long double next halfword\n"; 1052 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16) 1053 << '\t' << TAI->getCommentString() 1054 << " long double next halfword\n"; 1055 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32) 1056 << '\t' << TAI->getCommentString() 1057 << " long double next halfword\n"; 1058 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48) 1059 << '\t' << TAI->getCommentString() 1060 << " long double most significant halfword\n"; 1061 } 1062 EmitZeros(TD->getTypePaddedSize(Type::X86_FP80Ty) - 1063 TD->getTypeStoreSize(Type::X86_FP80Ty)); 1064 return; 1065 } else if (CFP->getType() == Type::PPC_FP128Ty) { 1066 // all long double variants are printed as hex 1067 // api needed to prevent premature destruction 1068 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1069 const uint64_t *p = api.getRawData(); 1070 if (TD->isBigEndian()) { 1071 O << TAI->getData32bitsDirective() << uint32_t(p[0] >> 32) 1072 << '\t' << TAI->getCommentString() 1073 << " long double most significant word\n"; 1074 O << TAI->getData32bitsDirective() << uint32_t(p[0]) 1075 << '\t' << TAI->getCommentString() 1076 << " long double next word\n"; 1077 O << TAI->getData32bitsDirective() << uint32_t(p[1] >> 32) 1078 << '\t' << TAI->getCommentString() 1079 << " long double next word\n"; 1080 O << TAI->getData32bitsDirective() << uint32_t(p[1]) 1081 << '\t' << TAI->getCommentString() 1082 << " long double least significant word\n"; 1083 } else { 1084 O << TAI->getData32bitsDirective() << uint32_t(p[1]) 1085 << '\t' << TAI->getCommentString() 1086 << " long double least significant word\n"; 1087 O << TAI->getData32bitsDirective() << uint32_t(p[1] >> 32) 1088 << '\t' << TAI->getCommentString() 1089 << " long double next word\n"; 1090 O << TAI->getData32bitsDirective() << uint32_t(p[0]) 1091 << '\t' << TAI->getCommentString() 1092 << " long double next word\n"; 1093 O << TAI->getData32bitsDirective() << uint32_t(p[0] >> 32) 1094 << '\t' << TAI->getCommentString() 1095 << " long double most significant word\n"; 1096 } 1097 return; 1098 } else assert(0 && "Floating point constant type not handled"); 1099} 1100 1101void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI) { 1102 const TargetData *TD = TM.getTargetData(); 1103 unsigned BitWidth = CI->getBitWidth(); 1104 assert(isPowerOf2_32(BitWidth) && 1105 "Non-power-of-2-sized integers not handled!"); 1106 1107 // We don't expect assemblers to support integer data directives 1108 // for more than 64 bits, so we emit the data in at most 64-bit 1109 // quantities at a time. 1110 const uint64_t *RawData = CI->getValue().getRawData(); 1111 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1112 uint64_t Val; 1113 if (TD->isBigEndian()) 1114 Val = RawData[e - i - 1]; 1115 else 1116 Val = RawData[i]; 1117 1118 if (TAI->getData64bitsDirective()) 1119 O << TAI->getData64bitsDirective() << Val << '\n'; 1120 else if (TD->isBigEndian()) { 1121 O << TAI->getData32bitsDirective() << unsigned(Val >> 32) 1122 << '\t' << TAI->getCommentString() 1123 << " Double-word most significant word " << Val << '\n'; 1124 O << TAI->getData32bitsDirective() << unsigned(Val) 1125 << '\t' << TAI->getCommentString() 1126 << " Double-word least significant word " << Val << '\n'; 1127 } else { 1128 O << TAI->getData32bitsDirective() << unsigned(Val) 1129 << '\t' << TAI->getCommentString() 1130 << " Double-word least significant word " << Val << '\n'; 1131 O << TAI->getData32bitsDirective() << unsigned(Val >> 32) 1132 << '\t' << TAI->getCommentString() 1133 << " Double-word most significant word " << Val << '\n'; 1134 } 1135 } 1136} 1137 1138/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 1139void AsmPrinter::EmitGlobalConstant(const Constant *CV) { 1140 const TargetData *TD = TM.getTargetData(); 1141 const Type *type = CV->getType(); 1142 unsigned Size = TD->getTypePaddedSize(type); 1143 1144 if (CV->isNullValue() || isa<UndefValue>(CV)) { 1145 EmitZeros(Size); 1146 return; 1147 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) { 1148 EmitGlobalConstantArray(CVA); 1149 return; 1150 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) { 1151 EmitGlobalConstantStruct(CVS); 1152 return; 1153 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) { 1154 EmitGlobalConstantFP(CFP); 1155 return; 1156 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1157 // Small integers are handled below; large integers are handled here. 1158 if (Size > 4) { 1159 EmitGlobalConstantLargeInt(CI); 1160 return; 1161 } 1162 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) { 1163 EmitGlobalConstantVector(CP); 1164 return; 1165 } 1166 1167 printDataDirective(type); 1168 EmitConstantValueOnly(CV); 1169 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1170 SmallString<40> S; 1171 CI->getValue().toStringUnsigned(S, 16); 1172 O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str(); 1173 } 1174 O << '\n'; 1175} 1176 1177void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1178 // Target doesn't support this yet! 1179 abort(); 1180} 1181 1182/// PrintSpecial - Print information related to the specified machine instr 1183/// that is independent of the operand, and may be independent of the instr 1184/// itself. This can be useful for portably encoding the comment character 1185/// or other bits of target-specific knowledge into the asmstrings. The 1186/// syntax used is ${:comment}. Targets can override this to add support 1187/// for their own strange codes. 1188void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) { 1189 if (!strcmp(Code, "private")) { 1190 O << TAI->getPrivateGlobalPrefix(); 1191 } else if (!strcmp(Code, "comment")) { 1192 O << TAI->getCommentString(); 1193 } else if (!strcmp(Code, "uid")) { 1194 // Assign a unique ID to this machine instruction. 1195 static const MachineInstr *LastMI = 0; 1196 static const Function *F = 0; 1197 static unsigned Counter = 0U-1; 1198 1199 // Comparing the address of MI isn't sufficient, because machineinstrs may 1200 // be allocated to the same address across functions. 1201 const Function *ThisF = MI->getParent()->getParent()->getFunction(); 1202 1203 // If this is a new machine instruction, bump the counter. 1204 if (LastMI != MI || F != ThisF) { 1205 ++Counter; 1206 LastMI = MI; 1207 F = ThisF; 1208 } 1209 O << Counter; 1210 } else { 1211 cerr << "Unknown special formatter '" << Code 1212 << "' for machine instr: " << *MI; 1213 exit(1); 1214 } 1215} 1216 1217 1218/// printInlineAsm - This method formats and prints the specified machine 1219/// instruction that is an inline asm. 1220void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { 1221 unsigned NumOperands = MI->getNumOperands(); 1222 1223 // Count the number of register definitions. 1224 unsigned NumDefs = 0; 1225 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef(); 1226 ++NumDefs) 1227 assert(NumDefs != NumOperands-1 && "No asm string?"); 1228 1229 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?"); 1230 1231 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. 1232 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); 1233 1234 // If this asmstr is empty, just print the #APP/#NOAPP markers. 1235 // These are useful to see where empty asm's wound up. 1236 if (AsmStr[0] == 0) { 1237 O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n'; 1238 return; 1239 } 1240 1241 O << TAI->getInlineAsmStart() << "\n\t"; 1242 1243 // The variant of the current asmprinter. 1244 int AsmPrinterVariant = TAI->getAssemblerDialect(); 1245 1246 int CurVariant = -1; // The number of the {.|.|.} region we are in. 1247 const char *LastEmitted = AsmStr; // One past the last character emitted. 1248 1249 while (*LastEmitted) { 1250 switch (*LastEmitted) { 1251 default: { 1252 // Not a special case, emit the string section literally. 1253 const char *LiteralEnd = LastEmitted+1; 1254 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && 1255 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') 1256 ++LiteralEnd; 1257 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1258 O.write(LastEmitted, LiteralEnd-LastEmitted); 1259 LastEmitted = LiteralEnd; 1260 break; 1261 } 1262 case '\n': 1263 ++LastEmitted; // Consume newline character. 1264 O << '\n'; // Indent code with newline. 1265 break; 1266 case '$': { 1267 ++LastEmitted; // Consume '$' character. 1268 bool Done = true; 1269 1270 // Handle escapes. 1271 switch (*LastEmitted) { 1272 default: Done = false; break; 1273 case '$': // $$ -> $ 1274 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1275 O << '$'; 1276 ++LastEmitted; // Consume second '$' character. 1277 break; 1278 case '(': // $( -> same as GCC's { character. 1279 ++LastEmitted; // Consume '(' character. 1280 if (CurVariant != -1) { 1281 cerr << "Nested variants found in inline asm string: '" 1282 << AsmStr << "'\n"; 1283 exit(1); 1284 } 1285 CurVariant = 0; // We're in the first variant now. 1286 break; 1287 case '|': 1288 ++LastEmitted; // consume '|' character. 1289 if (CurVariant == -1) 1290 O << '|'; // this is gcc's behavior for | outside a variant 1291 else 1292 ++CurVariant; // We're in the next variant. 1293 break; 1294 case ')': // $) -> same as GCC's } char. 1295 ++LastEmitted; // consume ')' character. 1296 if (CurVariant == -1) 1297 O << '}'; // this is gcc's behavior for } outside a variant 1298 else 1299 CurVariant = -1; 1300 break; 1301 } 1302 if (Done) break; 1303 1304 bool HasCurlyBraces = false; 1305 if (*LastEmitted == '{') { // ${variable} 1306 ++LastEmitted; // Consume '{' character. 1307 HasCurlyBraces = true; 1308 } 1309 1310 const char *IDStart = LastEmitted; 1311 char *IDEnd; 1312 errno = 0; 1313 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. 1314 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { 1315 cerr << "Bad $ operand number in inline asm string: '" 1316 << AsmStr << "'\n"; 1317 exit(1); 1318 } 1319 LastEmitted = IDEnd; 1320 1321 char Modifier[2] = { 0, 0 }; 1322 1323 if (HasCurlyBraces) { 1324 // If we have curly braces, check for a modifier character. This 1325 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. 1326 if (*LastEmitted == ':') { 1327 ++LastEmitted; // Consume ':' character. 1328 if (*LastEmitted == 0) { 1329 cerr << "Bad ${:} expression in inline asm string: '" 1330 << AsmStr << "'\n"; 1331 exit(1); 1332 } 1333 1334 Modifier[0] = *LastEmitted; 1335 ++LastEmitted; // Consume modifier character. 1336 } 1337 1338 if (*LastEmitted != '}') { 1339 cerr << "Bad ${} expression in inline asm string: '" 1340 << AsmStr << "'\n"; 1341 exit(1); 1342 } 1343 ++LastEmitted; // Consume '}' character. 1344 } 1345 1346 if ((unsigned)Val >= NumOperands-1) { 1347 cerr << "Invalid $ operand number in inline asm string: '" 1348 << AsmStr << "'\n"; 1349 exit(1); 1350 } 1351 1352 // Okay, we finally have a value number. Ask the target to print this 1353 // operand! 1354 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { 1355 unsigned OpNo = 1; 1356 1357 bool Error = false; 1358 1359 // Scan to find the machine operand number for the operand. 1360 for (; Val; --Val) { 1361 if (OpNo >= MI->getNumOperands()) break; 1362 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1363 OpNo += (OpFlags >> 3) + 1; 1364 } 1365 1366 if (OpNo >= MI->getNumOperands()) { 1367 Error = true; 1368 } else { 1369 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1370 ++OpNo; // Skip over the ID number. 1371 1372 if (Modifier[0]=='l') // labels are target independent 1373 printBasicBlockLabel(MI->getOperand(OpNo).getMBB(), 1374 false, false, false); 1375 else { 1376 AsmPrinter *AP = const_cast<AsmPrinter*>(this); 1377 if ((OpFlags & 7) == 4) { 1378 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, 1379 Modifier[0] ? Modifier : 0); 1380 } else { 1381 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, 1382 Modifier[0] ? Modifier : 0); 1383 } 1384 } 1385 } 1386 if (Error) { 1387 cerr << "Invalid operand found in inline asm: '" 1388 << AsmStr << "'\n"; 1389 MI->dump(); 1390 exit(1); 1391 } 1392 } 1393 break; 1394 } 1395 } 1396 } 1397 O << "\n\t" << TAI->getInlineAsmEnd() << '\n'; 1398} 1399 1400/// printImplicitDef - This method prints the specified machine instruction 1401/// that is an implicit def. 1402void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { 1403 O << '\t' << TAI->getCommentString() << " implicit-def: " 1404 << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n'; 1405} 1406 1407/// printLabel - This method prints a local label used by debug and 1408/// exception handling tables. 1409void AsmPrinter::printLabel(const MachineInstr *MI) const { 1410 printLabel(MI->getOperand(0).getImm()); 1411} 1412 1413void AsmPrinter::printLabel(unsigned Id) const { 1414 O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n"; 1415} 1416 1417/// printDeclare - This method prints a local variable declaration used by 1418/// debug tables. 1419/// FIXME: It doesn't really print anything rather it inserts a DebugVariable 1420/// entry into dwarf table. 1421void AsmPrinter::printDeclare(const MachineInstr *MI) const { 1422 int FI = MI->getOperand(0).getIndex(); 1423 GlobalValue *GV = MI->getOperand(1).getGlobal(); 1424 MMI->RecordVariable(GV, FI); 1425} 1426 1427/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 1428/// instruction, using the specified assembler variant. Targets should 1429/// overried this to format as appropriate. 1430bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 1431 unsigned AsmVariant, const char *ExtraCode) { 1432 // Target doesn't support this yet! 1433 return true; 1434} 1435 1436bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 1437 unsigned AsmVariant, 1438 const char *ExtraCode) { 1439 // Target doesn't support this yet! 1440 return true; 1441} 1442 1443/// printBasicBlockLabel - This method prints the label for the specified 1444/// MachineBasicBlock 1445void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB, 1446 bool printAlign, 1447 bool printColon, 1448 bool printComment) const { 1449 if (printAlign) { 1450 unsigned Align = MBB->getAlignment(); 1451 if (Align) 1452 EmitAlignment(Log2_32(Align)); 1453 } 1454 1455 O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_' 1456 << MBB->getNumber(); 1457 if (printColon) 1458 O << ':'; 1459 if (printComment && MBB->getBasicBlock()) 1460 O << '\t' << TAI->getCommentString() << ' ' 1461 << MBB->getBasicBlock()->getNameStart(); 1462} 1463 1464/// printPICJumpTableSetLabel - This method prints a set label for the 1465/// specified MachineBasicBlock for a jumptable entry. 1466void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, 1467 const MachineBasicBlock *MBB) const { 1468 if (!TAI->getSetDirective()) 1469 return; 1470 1471 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix() 1472 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','; 1473 printBasicBlockLabel(MBB, false, false, false); 1474 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1475 << '_' << uid << '\n'; 1476} 1477 1478void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2, 1479 const MachineBasicBlock *MBB) const { 1480 if (!TAI->getSetDirective()) 1481 return; 1482 1483 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix() 1484 << getFunctionNumber() << '_' << uid << '_' << uid2 1485 << "_set_" << MBB->getNumber() << ','; 1486 printBasicBlockLabel(MBB, false, false, false); 1487 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1488 << '_' << uid << '_' << uid2 << '\n'; 1489} 1490 1491/// printDataDirective - This method prints the asm directive for the 1492/// specified type. 1493void AsmPrinter::printDataDirective(const Type *type) { 1494 const TargetData *TD = TM.getTargetData(); 1495 switch (type->getTypeID()) { 1496 case Type::IntegerTyID: { 1497 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth(); 1498 if (BitWidth <= 8) 1499 O << TAI->getData8bitsDirective(); 1500 else if (BitWidth <= 16) 1501 O << TAI->getData16bitsDirective(); 1502 else if (BitWidth <= 32) 1503 O << TAI->getData32bitsDirective(); 1504 else if (BitWidth <= 64) { 1505 assert(TAI->getData64bitsDirective() && 1506 "Target cannot handle 64-bit constant exprs!"); 1507 O << TAI->getData64bitsDirective(); 1508 } else { 1509 assert(0 && "Target cannot handle given data directive width!"); 1510 } 1511 break; 1512 } 1513 case Type::PointerTyID: 1514 if (TD->getPointerSize() == 8) { 1515 assert(TAI->getData64bitsDirective() && 1516 "Target cannot handle 64-bit pointer exprs!"); 1517 O << TAI->getData64bitsDirective(); 1518 } else { 1519 O << TAI->getData32bitsDirective(); 1520 } 1521 break; 1522 case Type::FloatTyID: case Type::DoubleTyID: 1523 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID: 1524 assert (0 && "Should have already output floating point constant."); 1525 default: 1526 assert (0 && "Can't handle printing this type of thing"); 1527 break; 1528 } 1529} 1530 1531void AsmPrinter::printSuffixedName(const char *Name, const char *Suffix, 1532 const char *Prefix) { 1533 if (Name[0]=='\"') 1534 O << '\"'; 1535 O << TAI->getPrivateGlobalPrefix(); 1536 if (Prefix) O << Prefix; 1537 if (Name[0]=='\"') 1538 O << '\"'; 1539 if (Name[0]=='\"') 1540 O << Name[1]; 1541 else 1542 O << Name; 1543 O << Suffix; 1544 if (Name[0]=='\"') 1545 O << '\"'; 1546} 1547 1548void AsmPrinter::printSuffixedName(const std::string &Name, const char* Suffix) { 1549 printSuffixedName(Name.c_str(), Suffix); 1550} 1551 1552void AsmPrinter::printVisibility(const std::string& Name, 1553 unsigned Visibility) const { 1554 if (Visibility == GlobalValue::HiddenVisibility) { 1555 if (const char *Directive = TAI->getHiddenDirective()) 1556 O << Directive << Name << '\n'; 1557 } else if (Visibility == GlobalValue::ProtectedVisibility) { 1558 if (const char *Directive = TAI->getProtectedDirective()) 1559 O << Directive << Name << '\n'; 1560 } 1561} 1562 1563void AsmPrinter::printOffset(int64_t Offset) const { 1564 if (Offset > 0) 1565 O << '+' << Offset; 1566 else if (Offset < 0) 1567 O << Offset; 1568} 1569 1570GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1571 if (!S->usesMetadata()) 1572 return 0; 1573 1574 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1575 if (GCPI != GCMetadataPrinters.end()) 1576 return GCPI->second; 1577 1578 const char *Name = S->getName().c_str(); 1579 1580 for (GCMetadataPrinterRegistry::iterator 1581 I = GCMetadataPrinterRegistry::begin(), 1582 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1583 if (strcmp(Name, I->getName()) == 0) { 1584 GCMetadataPrinter *GMP = I->instantiate(); 1585 GMP->S = S; 1586 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1587 return GMP; 1588 } 1589 1590 cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n"; 1591 abort(); 1592} 1593