AsmPrinter.cpp revision 1e0e4896a635b3a82eab996f58e77e0a5ba537bd
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/CodeGen/DwarfWriter.h" 24#include "llvm/Support/Mangler.h" 25#include "llvm/Support/raw_ostream.h" 26#include "llvm/Target/TargetAsmInfo.h" 27#include "llvm/Target/TargetData.h" 28#include "llvm/Target/TargetLowering.h" 29#include "llvm/Target/TargetMachine.h" 30#include "llvm/Target/TargetOptions.h" 31#include "llvm/Target/TargetRegisterInfo.h" 32#include "llvm/ADT/SmallPtrSet.h" 33#include "llvm/ADT/SmallString.h" 34#include "llvm/ADT/StringExtras.h" 35#include <cerrno> 36using namespace llvm; 37 38char AsmPrinter::ID = 0; 39AsmPrinter::AsmPrinter(raw_ostream &o, TargetMachine &tm, 40 const TargetAsmInfo *T, bool F) 41 : MachineFunctionPass(&ID), FunctionNumber(0), Fast(F), O(o), 42 TM(tm), TAI(T), TRI(tm.getRegisterInfo()), 43 IsInTextSection(false) 44{} 45 46AsmPrinter::~AsmPrinter() { 47 for (gcp_iterator I = GCMetadataPrinters.begin(), 48 E = GCMetadataPrinters.end(); I != E; ++I) 49 delete I->second; 50} 51 52/// SwitchToTextSection - Switch to the specified text section of the executable 53/// if we are not already in it! 54/// 55void AsmPrinter::SwitchToTextSection(const char *NewSection, 56 const GlobalValue *GV) { 57 std::string NS; 58 if (GV && GV->hasSection()) 59 NS = TAI->getSwitchToSectionDirective() + GV->getSection(); 60 else 61 NS = NewSection; 62 63 // If we're already in this section, we're done. 64 if (CurrentSection == NS) return; 65 66 // Close the current section, if applicable. 67 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) 68 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; 69 70 CurrentSection = NS; 71 72 if (!CurrentSection.empty()) 73 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n'; 74 75 IsInTextSection = true; 76} 77 78/// SwitchToDataSection - Switch to the specified data section of the executable 79/// if we are not already in it! 80/// 81void AsmPrinter::SwitchToDataSection(const char *NewSection, 82 const GlobalValue *GV) { 83 std::string NS; 84 if (GV && GV->hasSection()) 85 NS = TAI->getSwitchToSectionDirective() + GV->getSection(); 86 else 87 NS = NewSection; 88 89 // If we're already in this section, we're done. 90 if (CurrentSection == NS) return; 91 92 // Close the current section, if applicable. 93 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) 94 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; 95 96 CurrentSection = NS; 97 98 if (!CurrentSection.empty()) 99 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n'; 100 101 IsInTextSection = false; 102} 103 104/// SwitchToSection - Switch to the specified section of the executable if we 105/// are not already in it! 106void AsmPrinter::SwitchToSection(const Section* NS) { 107 const std::string& NewSection = NS->getName(); 108 109 // If we're already in this section, we're done. 110 if (CurrentSection == NewSection) return; 111 112 // Close the current section, if applicable. 113 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) 114 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; 115 116 // FIXME: Make CurrentSection a Section* in the future 117 CurrentSection = NewSection; 118 CurrentSection_ = NS; 119 120 if (!CurrentSection.empty()) { 121 // If section is named we need to switch into it via special '.section' 122 // directive and also append funky flags. Otherwise - section name is just 123 // some magic assembler directive. 124 if (NS->isNamed()) 125 O << TAI->getSwitchToSectionDirective() 126 << CurrentSection 127 << TAI->getSectionFlags(NS->getFlags()); 128 else 129 O << CurrentSection; 130 O << TAI->getDataSectionStartSuffix() << '\n'; 131 } 132 133 IsInTextSection = (NS->getFlags() & SectionFlags::Code); 134} 135 136void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { 137 MachineFunctionPass::getAnalysisUsage(AU); 138 AU.addRequired<GCModuleInfo>(); 139} 140 141bool AsmPrinter::doInitialization(Module &M) { 142 Mang = new Mangler(M, TAI->getGlobalPrefix(), TAI->getPrivateGlobalPrefix()); 143 144 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 145 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 146 147 if (TAI->hasSingleParameterDotFile()) { 148 /* Very minimal debug info. It is ignored if we emit actual 149 debug info. If we don't, this at helps the user find where 150 a function came from. */ 151 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n"; 152 } 153 154 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 155 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 156 MP->beginAssembly(O, *this, *TAI); 157 158 if (!M.getModuleInlineAsm().empty()) 159 O << TAI->getCommentString() << " Start of file scope inline assembly\n" 160 << M.getModuleInlineAsm() 161 << '\n' << TAI->getCommentString() 162 << " End of file scope inline assembly\n"; 163 164 SwitchToDataSection(""); // Reset back to no section. 165 166 MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 167 if (MMI) MMI->AnalyzeModule(M); 168 DW = getAnalysisIfAvailable<DwarfWriter>(); 169 return false; 170} 171 172bool AsmPrinter::doFinalization(Module &M) { 173 if (TAI->getWeakRefDirective()) { 174 if (!ExtWeakSymbols.empty()) 175 SwitchToDataSection(""); 176 177 for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(), 178 e = ExtWeakSymbols.end(); i != e; ++i) { 179 const GlobalValue *GV = *i; 180 std::string Name = Mang->getValueName(GV); 181 O << TAI->getWeakRefDirective() << Name << '\n'; 182 } 183 } 184 185 if (TAI->getSetDirective()) { 186 if (!M.alias_empty()) 187 SwitchToSection(TAI->getTextSection()); 188 189 O << '\n'; 190 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 191 I!=E; ++I) { 192 std::string Name = Mang->getValueName(I); 193 std::string Target; 194 195 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 196 Target = Mang->getValueName(GV); 197 198 if (I->hasExternalLinkage() || !TAI->getWeakRefDirective()) 199 O << "\t.globl\t" << Name << '\n'; 200 else if (I->hasWeakLinkage()) 201 O << TAI->getWeakRefDirective() << Name << '\n'; 202 else if (!I->hasLocalLinkage()) 203 assert(0 && "Invalid alias linkage"); 204 205 printVisibility(Name, I->getVisibility()); 206 207 O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n'; 208 } 209 } 210 211 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 212 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 213 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 214 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 215 MP->finishAssembly(O, *this, *TAI); 216 217 // If we don't have any trampolines, then we don't require stack memory 218 // to be executable. Some targets have a directive to declare this. 219 Function* InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 220 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 221 if (TAI->getNonexecutableStackDirective()) 222 O << TAI->getNonexecutableStackDirective() << '\n'; 223 224 delete Mang; Mang = 0; 225 return false; 226} 227 228std::string AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) { 229 assert(MF && "No machine function?"); 230 std::string Name = MF->getFunction()->getName(); 231 if (Name.empty()) 232 Name = Mang->getValueName(MF->getFunction()); 233 return Mang->makeNameProper(TAI->getEHGlobalPrefix() + 234 Name + ".eh", TAI->getGlobalPrefix()); 235} 236 237void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 238 // What's my mangled name? 239 CurrentFnName = Mang->getValueName(MF.getFunction()); 240 IncrementFunctionNumber(); 241} 242 243/// EmitConstantPool - Print to the current output stream assembly 244/// representations of the constants in the constant pool MCP. This is 245/// used to print out constants which have been "spilled to memory" by 246/// the code generator. 247/// 248void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) { 249 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 250 if (CP.empty()) return; 251 252 // Calculate sections for constant pool entries. We collect entries to go into 253 // the same section together to reduce amount of section switch statements. 254 typedef 255 std::multimap<const Section*, 256 std::pair<MachineConstantPoolEntry, unsigned> > CPMap; 257 CPMap CPs; 258 SmallPtrSet<const Section*, 5> Sections; 259 260 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 261 MachineConstantPoolEntry CPE = CP[i]; 262 const Section* S = TAI->SelectSectionForMachineConst(CPE.getType()); 263 CPs.insert(std::make_pair(S, std::make_pair(CPE, i))); 264 Sections.insert(S); 265 } 266 267 // Now print stuff into the calculated sections. 268 for (SmallPtrSet<const Section*, 5>::iterator IS = Sections.begin(), 269 ES = Sections.end(); IS != ES; ++IS) { 270 SwitchToSection(*IS); 271 EmitAlignment(MCP->getConstantPoolAlignment()); 272 273 std::pair<CPMap::iterator, CPMap::iterator> II = CPs.equal_range(*IS); 274 for (CPMap::iterator I = II.first, E = II.second; I != E; ++I) { 275 CPMap::iterator J = next(I); 276 MachineConstantPoolEntry Entry = I->second.first; 277 unsigned index = I->second.second; 278 279 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' 280 << index << ":\t\t\t\t\t"; 281 // O << TAI->getCommentString() << ' ' << 282 // WriteTypeSymbolic(O, CP[i].first.getType(), 0); 283 O << '\n'; 284 if (Entry.isMachineConstantPoolEntry()) 285 EmitMachineConstantPoolValue(Entry.Val.MachineCPVal); 286 else 287 EmitGlobalConstant(Entry.Val.ConstVal); 288 289 // Emit inter-object padding for alignment. 290 if (J != E) { 291 const Type *Ty = Entry.getType(); 292 unsigned EntSize = TM.getTargetData()->getTypePaddedSize(Ty); 293 unsigned ValEnd = Entry.getOffset() + EntSize; 294 EmitZeros(J->second.first.getOffset()-ValEnd); 295 } 296 } 297 } 298} 299 300/// EmitJumpTableInfo - Print assembly representations of the jump tables used 301/// by the current function to the current output stream. 302/// 303void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI, 304 MachineFunction &MF) { 305 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 306 if (JT.empty()) return; 307 308 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 309 310 // Pick the directive to use to print the jump table entries, and switch to 311 // the appropriate section. 312 TargetLowering *LoweringInfo = TM.getTargetLowering(); 313 314 const char* JumpTableDataSection = TAI->getJumpTableDataSection(); 315 const Function *F = MF.getFunction(); 316 unsigned SectionFlags = TAI->SectionFlagsForGlobal(F); 317 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) || 318 !JumpTableDataSection || 319 SectionFlags & SectionFlags::Linkonce) { 320 // In PIC mode, we need to emit the jump table to the same section as the 321 // function body itself, otherwise the label differences won't make sense. 322 // We should also do if the section name is NULL or function is declared in 323 // discardable section. 324 SwitchToSection(TAI->SectionForGlobal(F)); 325 } else { 326 SwitchToDataSection(JumpTableDataSection); 327 } 328 329 EmitAlignment(Log2_32(MJTI->getAlignment())); 330 331 for (unsigned i = 0, e = JT.size(); i != e; ++i) { 332 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; 333 334 // If this jump table was deleted, ignore it. 335 if (JTBBs.empty()) continue; 336 337 // For PIC codegen, if possible we want to use the SetDirective to reduce 338 // the number of relocations the assembler will generate for the jump table. 339 // Set directives are all printed before the jump table itself. 340 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; 341 if (TAI->getSetDirective() && IsPic) 342 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 343 if (EmittedSets.insert(JTBBs[ii])) 344 printPICJumpTableSetLabel(i, JTBBs[ii]); 345 346 // On some targets (e.g. darwin) we want to emit two consequtive labels 347 // before each jump table. The first label is never referenced, but tells 348 // the assembler and linker the extents of the jump table object. The 349 // second label is actually referenced by the code. 350 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix()) 351 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n"; 352 353 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 354 << '_' << i << ":\n"; 355 356 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 357 printPICJumpTableEntry(MJTI, JTBBs[ii], i); 358 O << '\n'; 359 } 360 } 361} 362 363void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, 364 const MachineBasicBlock *MBB, 365 unsigned uid) const { 366 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 367 368 // Use JumpTableDirective otherwise honor the entry size from the jump table 369 // info. 370 const char *JTEntryDirective = TAI->getJumpTableDirective(); 371 bool HadJTEntryDirective = JTEntryDirective != NULL; 372 if (!HadJTEntryDirective) { 373 JTEntryDirective = MJTI->getEntrySize() == 4 ? 374 TAI->getData32bitsDirective() : TAI->getData64bitsDirective(); 375 } 376 377 O << JTEntryDirective << ' '; 378 379 // If we have emitted set directives for the jump table entries, print 380 // them rather than the entries themselves. If we're emitting PIC, then 381 // emit the table entries as differences between two text section labels. 382 // If we're emitting non-PIC code, then emit the entries as direct 383 // references to the target basic blocks. 384 if (IsPic) { 385 if (TAI->getSetDirective()) { 386 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber() 387 << '_' << uid << "_set_" << MBB->getNumber(); 388 } else { 389 printBasicBlockLabel(MBB, false, false, false); 390 // If the arch uses custom Jump Table directives, don't calc relative to 391 // JT 392 if (!HadJTEntryDirective) 393 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" 394 << getFunctionNumber() << '_' << uid; 395 } 396 } else { 397 printBasicBlockLabel(MBB, false, false, false); 398 } 399} 400 401 402/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 403/// special global used by LLVM. If so, emit it and return true, otherwise 404/// do nothing and return false. 405bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 406 if (GV->getName() == "llvm.used") { 407 if (TAI->getUsedDirective() != 0) // No need to emit this at all. 408 EmitLLVMUsedList(GV->getInitializer()); 409 return true; 410 } 411 412 // Ignore debug and non-emitted data. 413 if (GV->getSection() == "llvm.metadata") return true; 414 415 if (!GV->hasAppendingLinkage()) return false; 416 417 assert(GV->hasInitializer() && "Not a special LLVM global!"); 418 419 const TargetData *TD = TM.getTargetData(); 420 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 421 if (GV->getName() == "llvm.global_ctors") { 422 SwitchToDataSection(TAI->getStaticCtorsSection()); 423 EmitAlignment(Align, 0); 424 EmitXXStructorList(GV->getInitializer()); 425 return true; 426 } 427 428 if (GV->getName() == "llvm.global_dtors") { 429 SwitchToDataSection(TAI->getStaticDtorsSection()); 430 EmitAlignment(Align, 0); 431 EmitXXStructorList(GV->getInitializer()); 432 return true; 433 } 434 435 return false; 436} 437 438/// findGlobalValue - if CV is an expression equivalent to a single 439/// global value, return that value. 440const GlobalValue * AsmPrinter::findGlobalValue(const Constant *CV) { 441 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) 442 return GV; 443 else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { 444 const TargetData *TD = TM.getTargetData(); 445 unsigned Opcode = CE->getOpcode(); 446 switch (Opcode) { 447 case Instruction::GetElementPtr: { 448 const Constant *ptrVal = CE->getOperand(0); 449 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 450 if (TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], idxVec.size())) 451 return 0; 452 return findGlobalValue(ptrVal); 453 } 454 case Instruction::BitCast: 455 return findGlobalValue(CE->getOperand(0)); 456 default: 457 return 0; 458 } 459 } 460 return 0; 461} 462 463/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each 464/// global in the specified llvm.used list for which emitUsedDirectiveFor 465/// is true, as being used with this directive. 466 467void AsmPrinter::EmitLLVMUsedList(Constant *List) { 468 const char *Directive = TAI->getUsedDirective(); 469 470 // Should be an array of 'sbyte*'. 471 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 472 if (InitList == 0) return; 473 474 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 475 const GlobalValue *GV = findGlobalValue(InitList->getOperand(i)); 476 if (TAI->emitUsedDirectiveFor(GV, Mang)) { 477 O << Directive; 478 EmitConstantValueOnly(InitList->getOperand(i)); 479 O << '\n'; 480 } 481 } 482} 483 484/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 485/// function pointers, ignoring the init priority. 486void AsmPrinter::EmitXXStructorList(Constant *List) { 487 // Should be an array of '{ int, void ()* }' structs. The first value is the 488 // init priority, which we ignore. 489 if (!isa<ConstantArray>(List)) return; 490 ConstantArray *InitList = cast<ConstantArray>(List); 491 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 492 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 493 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 494 495 if (CS->getOperand(1)->isNullValue()) 496 return; // Found a null terminator, exit printing. 497 // Emit the function pointer. 498 EmitGlobalConstant(CS->getOperand(1)); 499 } 500} 501 502/// getGlobalLinkName - Returns the asm/link name of of the specified 503/// global variable. Should be overridden by each target asm printer to 504/// generate the appropriate value. 505const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{ 506 std::string LinkName; 507 508 if (isa<Function>(GV)) { 509 LinkName += TAI->getFunctionAddrPrefix(); 510 LinkName += Mang->getValueName(GV); 511 LinkName += TAI->getFunctionAddrSuffix(); 512 } else { 513 LinkName += TAI->getGlobalVarAddrPrefix(); 514 LinkName += Mang->getValueName(GV); 515 LinkName += TAI->getGlobalVarAddrSuffix(); 516 } 517 518 return LinkName; 519} 520 521/// EmitExternalGlobal - Emit the external reference to a global variable. 522/// Should be overridden if an indirect reference should be used. 523void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) { 524 O << getGlobalLinkName(GV); 525} 526 527 528 529//===----------------------------------------------------------------------===// 530/// LEB 128 number encoding. 531 532/// PrintULEB128 - Print a series of hexidecimal values (separated by commas) 533/// representing an unsigned leb128 value. 534void AsmPrinter::PrintULEB128(unsigned Value) const { 535 char Buffer[20]; 536 do { 537 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 538 Value >>= 7; 539 if (Value) Byte |= 0x80; 540 O << "0x" << utohex_buffer(Byte, Buffer+20); 541 if (Value) O << ", "; 542 } while (Value); 543} 544 545/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas) 546/// representing a signed leb128 value. 547void AsmPrinter::PrintSLEB128(int Value) const { 548 int Sign = Value >> (8 * sizeof(Value) - 1); 549 bool IsMore; 550 char Buffer[20]; 551 552 do { 553 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 554 Value >>= 7; 555 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; 556 if (IsMore) Byte |= 0x80; 557 O << "0x" << utohex_buffer(Byte, Buffer+20); 558 if (IsMore) O << ", "; 559 } while (IsMore); 560} 561 562//===--------------------------------------------------------------------===// 563// Emission and print routines 564// 565 566/// PrintHex - Print a value as a hexidecimal value. 567/// 568void AsmPrinter::PrintHex(int Value) const { 569 char Buffer[20]; 570 O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20); 571} 572 573/// EOL - Print a newline character to asm stream. If a comment is present 574/// then it will be printed first. Comments should not contain '\n'. 575void AsmPrinter::EOL() const { 576 O << '\n'; 577} 578 579void AsmPrinter::EOL(const std::string &Comment) const { 580 if (VerboseAsm && !Comment.empty()) { 581 O << '\t' 582 << TAI->getCommentString() 583 << ' ' 584 << Comment; 585 } 586 O << '\n'; 587} 588 589void AsmPrinter::EOL(const char* Comment) const { 590 if (VerboseAsm && *Comment) { 591 O << '\t' 592 << TAI->getCommentString() 593 << ' ' 594 << Comment; 595 } 596 O << '\n'; 597} 598 599/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an 600/// unsigned leb128 value. 601void AsmPrinter::EmitULEB128Bytes(unsigned Value) const { 602 if (TAI->hasLEB128()) { 603 O << "\t.uleb128\t" 604 << Value; 605 } else { 606 O << TAI->getData8bitsDirective(); 607 PrintULEB128(Value); 608 } 609} 610 611/// EmitSLEB128Bytes - print an assembler byte data directive to compose a 612/// signed leb128 value. 613void AsmPrinter::EmitSLEB128Bytes(int Value) const { 614 if (TAI->hasLEB128()) { 615 O << "\t.sleb128\t" 616 << Value; 617 } else { 618 O << TAI->getData8bitsDirective(); 619 PrintSLEB128(Value); 620 } 621} 622 623/// EmitInt8 - Emit a byte directive and value. 624/// 625void AsmPrinter::EmitInt8(int Value) const { 626 O << TAI->getData8bitsDirective(); 627 PrintHex(Value & 0xFF); 628} 629 630/// EmitInt16 - Emit a short directive and value. 631/// 632void AsmPrinter::EmitInt16(int Value) const { 633 O << TAI->getData16bitsDirective(); 634 PrintHex(Value & 0xFFFF); 635} 636 637/// EmitInt32 - Emit a long directive and value. 638/// 639void AsmPrinter::EmitInt32(int Value) const { 640 O << TAI->getData32bitsDirective(); 641 PrintHex(Value); 642} 643 644/// EmitInt64 - Emit a long long directive and value. 645/// 646void AsmPrinter::EmitInt64(uint64_t Value) const { 647 if (TAI->getData64bitsDirective()) { 648 O << TAI->getData64bitsDirective(); 649 PrintHex(Value); 650 } else { 651 if (TM.getTargetData()->isBigEndian()) { 652 EmitInt32(unsigned(Value >> 32)); O << '\n'; 653 EmitInt32(unsigned(Value)); 654 } else { 655 EmitInt32(unsigned(Value)); O << '\n'; 656 EmitInt32(unsigned(Value >> 32)); 657 } 658 } 659} 660 661/// toOctal - Convert the low order bits of X into an octal digit. 662/// 663static inline char toOctal(int X) { 664 return (X&7)+'0'; 665} 666 667/// printStringChar - Print a char, escaped if necessary. 668/// 669static void printStringChar(raw_ostream &O, char C) { 670 if (C == '"') { 671 O << "\\\""; 672 } else if (C == '\\') { 673 O << "\\\\"; 674 } else if (isprint((unsigned char)C)) { 675 O << C; 676 } else { 677 switch(C) { 678 case '\b': O << "\\b"; break; 679 case '\f': O << "\\f"; break; 680 case '\n': O << "\\n"; break; 681 case '\r': O << "\\r"; break; 682 case '\t': O << "\\t"; break; 683 default: 684 O << '\\'; 685 O << toOctal(C >> 6); 686 O << toOctal(C >> 3); 687 O << toOctal(C >> 0); 688 break; 689 } 690 } 691} 692 693/// EmitString - Emit a string with quotes and a null terminator. 694/// Special characters are emitted properly. 695/// \literal (Eg. '\t') \endliteral 696void AsmPrinter::EmitString(const std::string &String) const { 697 const char* AscizDirective = TAI->getAscizDirective(); 698 if (AscizDirective) 699 O << AscizDirective; 700 else 701 O << TAI->getAsciiDirective(); 702 O << '\"'; 703 for (unsigned i = 0, N = String.size(); i < N; ++i) { 704 unsigned char C = String[i]; 705 printStringChar(O, C); 706 } 707 if (AscizDirective) 708 O << '\"'; 709 else 710 O << "\\0\""; 711} 712 713 714/// EmitFile - Emit a .file directive. 715void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const { 716 O << "\t.file\t" << Number << " \""; 717 for (unsigned i = 0, N = Name.size(); i < N; ++i) { 718 unsigned char C = Name[i]; 719 printStringChar(O, C); 720 } 721 O << '\"'; 722} 723 724 725//===----------------------------------------------------------------------===// 726 727// EmitAlignment - Emit an alignment directive to the specified power of 728// two boundary. For example, if you pass in 3 here, you will get an 8 729// byte alignment. If a global value is specified, and if that global has 730// an explicit alignment requested, it will unconditionally override the 731// alignment request. However, if ForcedAlignBits is specified, this value 732// has final say: the ultimate alignment will be the max of ForcedAlignBits 733// and the alignment computed with NumBits and the global. 734// 735// The algorithm is: 736// Align = NumBits; 737// if (GV && GV->hasalignment) Align = GV->getalignment(); 738// Align = std::max(Align, ForcedAlignBits); 739// 740void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 741 unsigned ForcedAlignBits, 742 bool UseFillExpr) const { 743 if (GV && GV->getAlignment()) 744 NumBits = Log2_32(GV->getAlignment()); 745 NumBits = std::max(NumBits, ForcedAlignBits); 746 747 if (NumBits == 0) return; // No need to emit alignment. 748 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits; 749 O << TAI->getAlignDirective() << NumBits; 750 751 unsigned FillValue = TAI->getTextAlignFillValue(); 752 UseFillExpr &= IsInTextSection && FillValue; 753 if (UseFillExpr) { 754 O << ','; 755 PrintHex(FillValue); 756 } 757 O << '\n'; 758} 759 760 761/// EmitZeros - Emit a block of zeros. 762/// 763void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const { 764 if (NumZeros) { 765 if (TAI->getZeroDirective()) { 766 O << TAI->getZeroDirective() << NumZeros; 767 if (TAI->getZeroDirectiveSuffix()) 768 O << TAI->getZeroDirectiveSuffix(); 769 O << '\n'; 770 } else { 771 for (; NumZeros; --NumZeros) 772 O << TAI->getData8bitsDirective(AddrSpace) << "0\n"; 773 } 774 } 775} 776 777// Print out the specified constant, without a storage class. Only the 778// constants valid in constant expressions can occur here. 779void AsmPrinter::EmitConstantValueOnly(const Constant *CV) { 780 if (CV->isNullValue() || isa<UndefValue>(CV)) 781 O << '0'; 782 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 783 O << CI->getZExtValue(); 784 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) { 785 // This is a constant address for a global variable or function. Use the 786 // name of the variable or function as the address value, possibly 787 // decorating it with GlobalVarAddrPrefix/Suffix or 788 // FunctionAddrPrefix/Suffix (these all default to "" ) 789 if (isa<Function>(GV)) { 790 O << TAI->getFunctionAddrPrefix() 791 << Mang->getValueName(GV) 792 << TAI->getFunctionAddrSuffix(); 793 } else { 794 O << TAI->getGlobalVarAddrPrefix() 795 << Mang->getValueName(GV) 796 << TAI->getGlobalVarAddrSuffix(); 797 } 798 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { 799 const TargetData *TD = TM.getTargetData(); 800 unsigned Opcode = CE->getOpcode(); 801 switch (Opcode) { 802 case Instruction::GetElementPtr: { 803 // generate a symbolic expression for the byte address 804 const Constant *ptrVal = CE->getOperand(0); 805 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 806 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], 807 idxVec.size())) { 808 // Truncate/sext the offset to the pointer size. 809 if (TD->getPointerSizeInBits() != 64) { 810 int SExtAmount = 64-TD->getPointerSizeInBits(); 811 Offset = (Offset << SExtAmount) >> SExtAmount; 812 } 813 814 if (Offset) 815 O << '('; 816 EmitConstantValueOnly(ptrVal); 817 if (Offset > 0) 818 O << ") + " << Offset; 819 else if (Offset < 0) 820 O << ") - " << -Offset; 821 } else { 822 EmitConstantValueOnly(ptrVal); 823 } 824 break; 825 } 826 case Instruction::Trunc: 827 case Instruction::ZExt: 828 case Instruction::SExt: 829 case Instruction::FPTrunc: 830 case Instruction::FPExt: 831 case Instruction::UIToFP: 832 case Instruction::SIToFP: 833 case Instruction::FPToUI: 834 case Instruction::FPToSI: 835 assert(0 && "FIXME: Don't yet support this kind of constant cast expr"); 836 break; 837 case Instruction::BitCast: 838 return EmitConstantValueOnly(CE->getOperand(0)); 839 840 case Instruction::IntToPtr: { 841 // Handle casts to pointers by changing them into casts to the appropriate 842 // integer type. This promotes constant folding and simplifies this code. 843 Constant *Op = CE->getOperand(0); 844 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/); 845 return EmitConstantValueOnly(Op); 846 } 847 848 849 case Instruction::PtrToInt: { 850 // Support only foldable casts to/from pointers that can be eliminated by 851 // changing the pointer to the appropriately sized integer type. 852 Constant *Op = CE->getOperand(0); 853 const Type *Ty = CE->getType(); 854 855 // We can emit the pointer value into this slot if the slot is an 856 // integer slot greater or equal to the size of the pointer. 857 if (TD->getTypePaddedSize(Ty) >= TD->getTypePaddedSize(Op->getType())) 858 return EmitConstantValueOnly(Op); 859 860 O << "(("; 861 EmitConstantValueOnly(Op); 862 APInt ptrMask = APInt::getAllOnesValue(TD->getTypePaddedSizeInBits(Ty)); 863 864 SmallString<40> S; 865 ptrMask.toStringUnsigned(S); 866 O << ") & " << S.c_str() << ')'; 867 break; 868 } 869 case Instruction::Add: 870 case Instruction::Sub: 871 case Instruction::And: 872 case Instruction::Or: 873 case Instruction::Xor: 874 O << '('; 875 EmitConstantValueOnly(CE->getOperand(0)); 876 O << ')'; 877 switch (Opcode) { 878 case Instruction::Add: 879 O << " + "; 880 break; 881 case Instruction::Sub: 882 O << " - "; 883 break; 884 case Instruction::And: 885 O << " & "; 886 break; 887 case Instruction::Or: 888 O << " | "; 889 break; 890 case Instruction::Xor: 891 O << " ^ "; 892 break; 893 default: 894 break; 895 } 896 O << '('; 897 EmitConstantValueOnly(CE->getOperand(1)); 898 O << ')'; 899 break; 900 default: 901 assert(0 && "Unsupported operator!"); 902 } 903 } else { 904 assert(0 && "Unknown constant value!"); 905 } 906} 907 908/// printAsCString - Print the specified array as a C compatible string, only if 909/// the predicate isString is true. 910/// 911static void printAsCString(raw_ostream &O, const ConstantArray *CVA, 912 unsigned LastElt) { 913 assert(CVA->isString() && "Array is not string compatible!"); 914 915 O << '\"'; 916 for (unsigned i = 0; i != LastElt; ++i) { 917 unsigned char C = 918 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue(); 919 printStringChar(O, C); 920 } 921 O << '\"'; 922} 923 924/// EmitString - Emit a zero-byte-terminated string constant. 925/// 926void AsmPrinter::EmitString(const ConstantArray *CVA) const { 927 unsigned NumElts = CVA->getNumOperands(); 928 if (TAI->getAscizDirective() && NumElts && 929 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) { 930 O << TAI->getAscizDirective(); 931 printAsCString(O, CVA, NumElts-1); 932 } else { 933 O << TAI->getAsciiDirective(); 934 printAsCString(O, CVA, NumElts); 935 } 936 O << '\n'; 937} 938 939void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA) { 940 if (CVA->isString()) { 941 EmitString(CVA); 942 } else { // Not a string. Print the values in successive locations 943 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) 944 EmitGlobalConstant(CVA->getOperand(i)); 945 } 946} 947 948void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) { 949 const VectorType *PTy = CP->getType(); 950 951 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I) 952 EmitGlobalConstant(CP->getOperand(I)); 953} 954 955void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS, 956 unsigned AddrSpace) { 957 // Print the fields in successive locations. Pad to align if needed! 958 const TargetData *TD = TM.getTargetData(); 959 unsigned Size = TD->getTypePaddedSize(CVS->getType()); 960 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType()); 961 uint64_t sizeSoFar = 0; 962 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) { 963 const Constant* field = CVS->getOperand(i); 964 965 // Check if padding is needed and insert one or more 0s. 966 uint64_t fieldSize = TD->getTypePaddedSize(field->getType()); 967 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1)) 968 - cvsLayout->getElementOffset(i)) - fieldSize; 969 sizeSoFar += fieldSize + padSize; 970 971 // Now print the actual field value. 972 EmitGlobalConstant(field, AddrSpace); 973 974 // Insert padding - this may include padding to increase the size of the 975 // current field up to the ABI size (if the struct is not packed) as well 976 // as padding to ensure that the next field starts at the right offset. 977 EmitZeros(padSize, AddrSpace); 978 } 979 assert(sizeSoFar == cvsLayout->getSizeInBytes() && 980 "Layout of constant struct may be incorrect!"); 981} 982 983void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP, 984 unsigned AddrSpace) { 985 // FP Constants are printed as integer constants to avoid losing 986 // precision... 987 const TargetData *TD = TM.getTargetData(); 988 if (CFP->getType() == Type::DoubleTy) { 989 double Val = CFP->getValueAPF().convertToDouble(); // for comment only 990 uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 991 if (TAI->getData64bitsDirective(AddrSpace)) 992 O << TAI->getData64bitsDirective(AddrSpace) << i << '\t' 993 << TAI->getCommentString() << " double value: " << Val << '\n'; 994 else if (TD->isBigEndian()) { 995 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32) 996 << '\t' << TAI->getCommentString() 997 << " double most significant word " << Val << '\n'; 998 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i) 999 << '\t' << TAI->getCommentString() 1000 << " double least significant word " << Val << '\n'; 1001 } else { 1002 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i) 1003 << '\t' << TAI->getCommentString() 1004 << " double least significant word " << Val << '\n'; 1005 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32) 1006 << '\t' << TAI->getCommentString() 1007 << " double most significant word " << Val << '\n'; 1008 } 1009 return; 1010 } else if (CFP->getType() == Type::FloatTy) { 1011 float Val = CFP->getValueAPF().convertToFloat(); // for comment only 1012 O << TAI->getData32bitsDirective(AddrSpace) 1013 << CFP->getValueAPF().bitcastToAPInt().getZExtValue() 1014 << '\t' << TAI->getCommentString() << " float " << Val << '\n'; 1015 return; 1016 } else if (CFP->getType() == Type::X86_FP80Ty) { 1017 // all long double variants are printed as hex 1018 // api needed to prevent premature destruction 1019 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1020 const uint64_t *p = api.getRawData(); 1021 // Convert to double so we can print the approximate val as a comment. 1022 APFloat DoubleVal = CFP->getValueAPF(); 1023 bool ignored; 1024 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 1025 &ignored); 1026 if (TD->isBigEndian()) { 1027 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48) 1028 << '\t' << TAI->getCommentString() 1029 << " long double most significant halfword of ~" 1030 << DoubleVal.convertToDouble() << '\n'; 1031 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32) 1032 << '\t' << TAI->getCommentString() 1033 << " long double next halfword\n"; 1034 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16) 1035 << '\t' << TAI->getCommentString() 1036 << " long double next halfword\n"; 1037 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]) 1038 << '\t' << TAI->getCommentString() 1039 << " long double next halfword\n"; 1040 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]) 1041 << '\t' << TAI->getCommentString() 1042 << " long double least significant halfword\n"; 1043 } else { 1044 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]) 1045 << '\t' << TAI->getCommentString() 1046 << " long double least significant halfword of ~" 1047 << DoubleVal.convertToDouble() << '\n'; 1048 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]) 1049 << '\t' << TAI->getCommentString() 1050 << " long double next halfword\n"; 1051 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16) 1052 << '\t' << TAI->getCommentString() 1053 << " long double next halfword\n"; 1054 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32) 1055 << '\t' << TAI->getCommentString() 1056 << " long double next halfword\n"; 1057 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48) 1058 << '\t' << TAI->getCommentString() 1059 << " long double most significant halfword\n"; 1060 } 1061 EmitZeros(TD->getTypePaddedSize(Type::X86_FP80Ty) - 1062 TD->getTypeStoreSize(Type::X86_FP80Ty), AddrSpace); 1063 return; 1064 } else if (CFP->getType() == Type::PPC_FP128Ty) { 1065 // all long double variants are printed as hex 1066 // api needed to prevent premature destruction 1067 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1068 const uint64_t *p = api.getRawData(); 1069 if (TD->isBigEndian()) { 1070 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32) 1071 << '\t' << TAI->getCommentString() 1072 << " long double most significant word\n"; 1073 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]) 1074 << '\t' << TAI->getCommentString() 1075 << " long double next word\n"; 1076 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32) 1077 << '\t' << TAI->getCommentString() 1078 << " long double next word\n"; 1079 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]) 1080 << '\t' << TAI->getCommentString() 1081 << " long double least significant word\n"; 1082 } else { 1083 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]) 1084 << '\t' << TAI->getCommentString() 1085 << " long double least significant word\n"; 1086 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32) 1087 << '\t' << TAI->getCommentString() 1088 << " long double next word\n"; 1089 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]) 1090 << '\t' << TAI->getCommentString() 1091 << " long double next word\n"; 1092 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32) 1093 << '\t' << TAI->getCommentString() 1094 << " long double most significant word\n"; 1095 } 1096 return; 1097 } else assert(0 && "Floating point constant type not handled"); 1098} 1099 1100void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI, 1101 unsigned AddrSpace) { 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(AddrSpace)) 1119 O << TAI->getData64bitsDirective(AddrSpace) << Val << '\n'; 1120 else if (TD->isBigEndian()) { 1121 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32) 1122 << '\t' << TAI->getCommentString() 1123 << " Double-word most significant word " << Val << '\n'; 1124 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val) 1125 << '\t' << TAI->getCommentString() 1126 << " Double-word least significant word " << Val << '\n'; 1127 } else { 1128 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val) 1129 << '\t' << TAI->getCommentString() 1130 << " Double-word least significant word " << Val << '\n'; 1131 O << TAI->getData32bitsDirective(AddrSpace) << 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, unsigned AddrSpace) { 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, AddrSpace); 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, AddrSpace); 1152 return; 1153 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) { 1154 EmitGlobalConstantFP(CFP, AddrSpace); 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, AddrSpace); 1160 return; 1161 } 1162 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) { 1163 EmitGlobalConstantVector(CP); 1164 return; 1165 } 1166 1167 printDataDirective(type, AddrSpace); 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 unsigned FI = MI->getOperand(0).getIndex(); 1423 GlobalValue *GV = MI->getOperand(1).getGlobal(); 1424 DW->RecordVariable(cast<GlobalVariable>(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, unsigned AddrSpace) { 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(AddrSpace); 1500 else if (BitWidth <= 16) 1501 O << TAI->getData16bitsDirective(AddrSpace); 1502 else if (BitWidth <= 32) 1503 O << TAI->getData32bitsDirective(AddrSpace); 1504 else if (BitWidth <= 64) { 1505 assert(TAI->getData64bitsDirective(AddrSpace) && 1506 "Target cannot handle 64-bit constant exprs!"); 1507 O << TAI->getData64bitsDirective(AddrSpace); 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(AddrSpace) && 1516 "Target cannot handle 64-bit pointer exprs!"); 1517 O << TAI->getData64bitsDirective(AddrSpace); 1518 } else if (TD->getPointerSize() == 2) { 1519 O << TAI->getData16bitsDirective(AddrSpace); 1520 } else if (TD->getPointerSize() == 1) { 1521 O << TAI->getData8bitsDirective(AddrSpace); 1522 } else { 1523 O << TAI->getData32bitsDirective(AddrSpace); 1524 } 1525 break; 1526 case Type::FloatTyID: case Type::DoubleTyID: 1527 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID: 1528 assert (0 && "Should have already output floating point constant."); 1529 default: 1530 assert (0 && "Can't handle printing this type of thing"); 1531 break; 1532 } 1533} 1534 1535void AsmPrinter::printSuffixedName(const char *Name, const char *Suffix, 1536 const char *Prefix) { 1537 if (Name[0]=='\"') 1538 O << '\"'; 1539 O << TAI->getPrivateGlobalPrefix(); 1540 if (Prefix) O << Prefix; 1541 if (Name[0]=='\"') 1542 O << '\"'; 1543 if (Name[0]=='\"') 1544 O << Name[1]; 1545 else 1546 O << Name; 1547 O << Suffix; 1548 if (Name[0]=='\"') 1549 O << '\"'; 1550} 1551 1552void AsmPrinter::printSuffixedName(const std::string &Name, const char* Suffix) { 1553 printSuffixedName(Name.c_str(), Suffix); 1554} 1555 1556void AsmPrinter::printVisibility(const std::string& Name, 1557 unsigned Visibility) const { 1558 if (Visibility == GlobalValue::HiddenVisibility) { 1559 if (const char *Directive = TAI->getHiddenDirective()) 1560 O << Directive << Name << '\n'; 1561 } else if (Visibility == GlobalValue::ProtectedVisibility) { 1562 if (const char *Directive = TAI->getProtectedDirective()) 1563 O << Directive << Name << '\n'; 1564 } 1565} 1566 1567void AsmPrinter::printOffset(int64_t Offset) const { 1568 if (Offset > 0) 1569 O << '+' << Offset; 1570 else if (Offset < 0) 1571 O << Offset; 1572} 1573 1574GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1575 if (!S->usesMetadata()) 1576 return 0; 1577 1578 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1579 if (GCPI != GCMetadataPrinters.end()) 1580 return GCPI->second; 1581 1582 const char *Name = S->getName().c_str(); 1583 1584 for (GCMetadataPrinterRegistry::iterator 1585 I = GCMetadataPrinterRegistry::begin(), 1586 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1587 if (strcmp(Name, I->getName()) == 0) { 1588 GCMetadataPrinter *GMP = I->instantiate(); 1589 GMP->S = S; 1590 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1591 return GMP; 1592 } 1593 1594 cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n"; 1595 abort(); 1596} 1597