AsmPrinter.cpp revision d7ca416d6c9ae1966e0df8193112e3c5f430a053
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 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 146 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 147 MP->beginAssembly(O, *this, *TAI); 148 149 if (!M.getModuleInlineAsm().empty()) 150 O << TAI->getCommentString() << " Start of file scope inline assembly\n" 151 << M.getModuleInlineAsm() 152 << '\n' << TAI->getCommentString() 153 << " End of file scope inline assembly\n"; 154 155 SwitchToDataSection(""); // Reset back to no section. 156 157 MMI = getAnalysisToUpdate<MachineModuleInfo>(); 158 if (MMI) MMI->AnalyzeModule(M); 159 160 return false; 161} 162 163bool AsmPrinter::doFinalization(Module &M) { 164 if (TAI->getWeakRefDirective()) { 165 if (!ExtWeakSymbols.empty()) 166 SwitchToDataSection(""); 167 168 for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(), 169 e = ExtWeakSymbols.end(); i != e; ++i) { 170 const GlobalValue *GV = *i; 171 std::string Name = Mang->getValueName(GV); 172 O << TAI->getWeakRefDirective() << Name << '\n'; 173 } 174 } 175 176 if (TAI->getSetDirective()) { 177 if (!M.alias_empty()) 178 SwitchToSection(TAI->getTextSection()); 179 180 O << '\n'; 181 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 182 I!=E; ++I) { 183 std::string Name = Mang->getValueName(I); 184 std::string Target; 185 186 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 187 Target = Mang->getValueName(GV); 188 189 if (I->hasExternalLinkage() || !TAI->getWeakRefDirective()) 190 O << "\t.globl\t" << Name << '\n'; 191 else if (I->hasWeakLinkage()) 192 O << TAI->getWeakRefDirective() << Name << '\n'; 193 else if (!I->hasInternalLinkage()) 194 assert(0 && "Invalid alias linkage"); 195 196 if (I->hasHiddenVisibility()) { 197 if (const char *Directive = TAI->getHiddenDirective()) 198 O << Directive << Name << '\n'; 199 } else if (I->hasProtectedVisibility()) { 200 if (const char *Directive = TAI->getProtectedDirective()) 201 O << Directive << Name << '\n'; 202 } 203 204 O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n'; 205 206 // If the aliasee has external weak linkage it can be referenced only by 207 // alias itself. In this case it can be not in ExtWeakSymbols list. Emit 208 // weak reference in such case. 209 if (GV->hasExternalWeakLinkage()) { 210 if (TAI->getWeakRefDirective()) 211 O << TAI->getWeakRefDirective() << Target << '\n'; 212 else 213 O << "\t.globl\t" << Target << '\n'; 214 } 215 } 216 } 217 218 GCModuleInfo *MI = getAnalysisToUpdate<GCModuleInfo>(); 219 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 220 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 221 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 222 MP->finishAssembly(O, *this, *TAI); 223 224 // If we don't have any trampolines, then we don't require stack memory 225 // to be executable. Some targets have a directive to declare this. 226 Function* InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 227 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 228 if (TAI->getNonexecutableStackDirective()) 229 O << TAI->getNonexecutableStackDirective() << '\n'; 230 231 delete Mang; Mang = 0; 232 return false; 233} 234 235std::string AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) { 236 assert(MF && "No machine function?"); 237 std::string Name = MF->getFunction()->getName(); 238 if (Name.empty()) 239 Name = Mang->getValueName(MF->getFunction()); 240 return Mang->makeNameProper(Name + ".eh", TAI->getGlobalPrefix()); 241} 242 243void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 244 // What's my mangled name? 245 CurrentFnName = Mang->getValueName(MF.getFunction()); 246 IncrementFunctionNumber(); 247} 248 249/// EmitConstantPool - Print to the current output stream assembly 250/// representations of the constants in the constant pool MCP. This is 251/// used to print out constants which have been "spilled to memory" by 252/// the code generator. 253/// 254void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) { 255 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 256 if (CP.empty()) return; 257 258 // Some targets require 4-, 8-, and 16- byte constant literals to be placed 259 // in special sections. 260 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs; 261 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs; 262 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs; 263 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs; 264 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs; 265 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 266 MachineConstantPoolEntry CPE = CP[i]; 267 const Type *Ty = CPE.getType(); 268 if (TAI->getFourByteConstantSection() && 269 TM.getTargetData()->getABITypeSize(Ty) == 4) 270 FourByteCPs.push_back(std::make_pair(CPE, i)); 271 else if (TAI->getEightByteConstantSection() && 272 TM.getTargetData()->getABITypeSize(Ty) == 8) 273 EightByteCPs.push_back(std::make_pair(CPE, i)); 274 else if (TAI->getSixteenByteConstantSection() && 275 TM.getTargetData()->getABITypeSize(Ty) == 16) 276 SixteenByteCPs.push_back(std::make_pair(CPE, i)); 277 else 278 OtherCPs.push_back(std::make_pair(CPE, i)); 279 } 280 281 unsigned Alignment = MCP->getConstantPoolAlignment(); 282 EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs); 283 EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs); 284 EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(), 285 SixteenByteCPs); 286 EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs); 287} 288 289void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section, 290 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) { 291 if (CP.empty()) return; 292 293 SwitchToDataSection(Section); 294 EmitAlignment(Alignment); 295 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 296 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' 297 << CP[i].second << ":\t\t\t\t\t"; 298 // O << TAI->getCommentString() << ' ' << 299 // WriteTypeSymbolic(O, CP[i].first.getType(), 0); 300 O << '\n'; 301 if (CP[i].first.isMachineConstantPoolEntry()) 302 EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal); 303 else 304 EmitGlobalConstant(CP[i].first.Val.ConstVal); 305 if (i != e-1) { 306 const Type *Ty = CP[i].first.getType(); 307 unsigned EntSize = 308 TM.getTargetData()->getABITypeSize(Ty); 309 unsigned ValEnd = CP[i].first.getOffset() + EntSize; 310 // Emit inter-object padding for alignment. 311 EmitZeros(CP[i+1].first.getOffset()-ValEnd); 312 } 313 } 314} 315 316/// EmitJumpTableInfo - Print assembly representations of the jump tables used 317/// by the current function to the current output stream. 318/// 319void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI, 320 MachineFunction &MF) { 321 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 322 if (JT.empty()) return; 323 324 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 325 326 // Pick the directive to use to print the jump table entries, and switch to 327 // the appropriate section. 328 TargetLowering *LoweringInfo = TM.getTargetLowering(); 329 330 const char* JumpTableDataSection = TAI->getJumpTableDataSection(); 331 const Function *F = MF.getFunction(); 332 unsigned SectionFlags = TAI->SectionFlagsForGlobal(F); 333 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) || 334 !JumpTableDataSection || 335 SectionFlags & SectionFlags::Linkonce) { 336 // In PIC mode, we need to emit the jump table to the same section as the 337 // function body itself, otherwise the label differences won't make sense. 338 // We should also do if the section name is NULL or function is declared in 339 // discardable section. 340 SwitchToSection(TAI->SectionForGlobal(F)); 341 } else { 342 SwitchToDataSection(JumpTableDataSection); 343 } 344 345 EmitAlignment(Log2_32(MJTI->getAlignment())); 346 347 for (unsigned i = 0, e = JT.size(); i != e; ++i) { 348 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; 349 350 // If this jump table was deleted, ignore it. 351 if (JTBBs.empty()) continue; 352 353 // For PIC codegen, if possible we want to use the SetDirective to reduce 354 // the number of relocations the assembler will generate for the jump table. 355 // Set directives are all printed before the jump table itself. 356 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; 357 if (TAI->getSetDirective() && IsPic) 358 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 359 if (EmittedSets.insert(JTBBs[ii])) 360 printPICJumpTableSetLabel(i, JTBBs[ii]); 361 362 // On some targets (e.g. darwin) we want to emit two consequtive labels 363 // before each jump table. The first label is never referenced, but tells 364 // the assembler and linker the extents of the jump table object. The 365 // second label is actually referenced by the code. 366 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix()) 367 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n"; 368 369 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 370 << '_' << i << ":\n"; 371 372 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 373 printPICJumpTableEntry(MJTI, JTBBs[ii], i); 374 O << '\n'; 375 } 376 } 377} 378 379void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, 380 const MachineBasicBlock *MBB, 381 unsigned uid) const { 382 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 383 384 // Use JumpTableDirective otherwise honor the entry size from the jump table 385 // info. 386 const char *JTEntryDirective = TAI->getJumpTableDirective(); 387 bool HadJTEntryDirective = JTEntryDirective != NULL; 388 if (!HadJTEntryDirective) { 389 JTEntryDirective = MJTI->getEntrySize() == 4 ? 390 TAI->getData32bitsDirective() : TAI->getData64bitsDirective(); 391 } 392 393 O << JTEntryDirective << ' '; 394 395 // If we have emitted set directives for the jump table entries, print 396 // them rather than the entries themselves. If we're emitting PIC, then 397 // emit the table entries as differences between two text section labels. 398 // If we're emitting non-PIC code, then emit the entries as direct 399 // references to the target basic blocks. 400 if (IsPic) { 401 if (TAI->getSetDirective()) { 402 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber() 403 << '_' << uid << "_set_" << MBB->getNumber(); 404 } else { 405 printBasicBlockLabel(MBB, false, false, false); 406 // If the arch uses custom Jump Table directives, don't calc relative to 407 // JT 408 if (!HadJTEntryDirective) 409 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" 410 << getFunctionNumber() << '_' << uid; 411 } 412 } else { 413 printBasicBlockLabel(MBB, false, false, false); 414 } 415} 416 417 418/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 419/// special global used by LLVM. If so, emit it and return true, otherwise 420/// do nothing and return false. 421bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 422 if (GV->getName() == "llvm.used") { 423 if (TAI->getUsedDirective() != 0) // No need to emit this at all. 424 EmitLLVMUsedList(GV->getInitializer()); 425 return true; 426 } 427 428 // Ignore debug and non-emitted data. 429 if (GV->getSection() == "llvm.metadata") return true; 430 431 if (!GV->hasAppendingLinkage()) return false; 432 433 assert(GV->hasInitializer() && "Not a special LLVM global!"); 434 435 const TargetData *TD = TM.getTargetData(); 436 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 437 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) { 438 SwitchToDataSection(TAI->getStaticCtorsSection()); 439 EmitAlignment(Align, 0); 440 EmitXXStructorList(GV->getInitializer()); 441 return true; 442 } 443 444 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) { 445 SwitchToDataSection(TAI->getStaticDtorsSection()); 446 EmitAlignment(Align, 0); 447 EmitXXStructorList(GV->getInitializer()); 448 return true; 449 } 450 451 return false; 452} 453 454/// findGlobalValue - if CV is an expression equivalent to a single 455/// global value, return that value. 456const GlobalValue * AsmPrinter::findGlobalValue(const Constant *CV) { 457 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) 458 return GV; 459 else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { 460 const TargetData *TD = TM.getTargetData(); 461 unsigned Opcode = CE->getOpcode(); 462 switch (Opcode) { 463 case Instruction::GetElementPtr: { 464 const Constant *ptrVal = CE->getOperand(0); 465 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 466 if (TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], idxVec.size())) 467 return 0; 468 return findGlobalValue(ptrVal); 469 } 470 case Instruction::BitCast: 471 return findGlobalValue(CE->getOperand(0)); 472 default: 473 return 0; 474 } 475 } 476 return 0; 477} 478 479/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each 480/// global in the specified llvm.used list for which emitUsedDirectiveFor 481/// is true, as being used with this directive. 482 483void AsmPrinter::EmitLLVMUsedList(Constant *List) { 484 const char *Directive = TAI->getUsedDirective(); 485 486 // Should be an array of 'sbyte*'. 487 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 488 if (InitList == 0) return; 489 490 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 491 const GlobalValue *GV = findGlobalValue(InitList->getOperand(i)); 492 if (TAI->emitUsedDirectiveFor(GV, Mang)) { 493 O << Directive; 494 EmitConstantValueOnly(InitList->getOperand(i)); 495 O << '\n'; 496 } 497 } 498} 499 500/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 501/// function pointers, ignoring the init priority. 502void AsmPrinter::EmitXXStructorList(Constant *List) { 503 // Should be an array of '{ int, void ()* }' structs. The first value is the 504 // init priority, which we ignore. 505 if (!isa<ConstantArray>(List)) return; 506 ConstantArray *InitList = cast<ConstantArray>(List); 507 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 508 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 509 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 510 511 if (CS->getOperand(1)->isNullValue()) 512 return; // Found a null terminator, exit printing. 513 // Emit the function pointer. 514 EmitGlobalConstant(CS->getOperand(1)); 515 } 516} 517 518/// getGlobalLinkName - Returns the asm/link name of of the specified 519/// global variable. Should be overridden by each target asm printer to 520/// generate the appropriate value. 521const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{ 522 std::string LinkName; 523 524 if (isa<Function>(GV)) { 525 LinkName += TAI->getFunctionAddrPrefix(); 526 LinkName += Mang->getValueName(GV); 527 LinkName += TAI->getFunctionAddrSuffix(); 528 } else { 529 LinkName += TAI->getGlobalVarAddrPrefix(); 530 LinkName += Mang->getValueName(GV); 531 LinkName += TAI->getGlobalVarAddrSuffix(); 532 } 533 534 return LinkName; 535} 536 537/// EmitExternalGlobal - Emit the external reference to a global variable. 538/// Should be overridden if an indirect reference should be used. 539void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) { 540 O << getGlobalLinkName(GV); 541} 542 543 544 545//===----------------------------------------------------------------------===// 546/// LEB 128 number encoding. 547 548/// PrintULEB128 - Print a series of hexidecimal values (separated by commas) 549/// representing an unsigned leb128 value. 550void AsmPrinter::PrintULEB128(unsigned Value) const { 551 do { 552 unsigned Byte = Value & 0x7f; 553 Value >>= 7; 554 if (Value) Byte |= 0x80; 555 O << "0x" << utohexstr(Byte); 556 if (Value) O << ", "; 557 } while (Value); 558} 559 560/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas) 561/// representing a signed leb128 value. 562void AsmPrinter::PrintSLEB128(int Value) const { 563 int Sign = Value >> (8 * sizeof(Value) - 1); 564 bool IsMore; 565 566 do { 567 unsigned Byte = Value & 0x7f; 568 Value >>= 7; 569 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; 570 if (IsMore) Byte |= 0x80; 571 O << "0x" << utohexstr(Byte); 572 if (IsMore) O << ", "; 573 } while (IsMore); 574} 575 576//===--------------------------------------------------------------------===// 577// Emission and print routines 578// 579 580/// PrintHex - Print a value as a hexidecimal value. 581/// 582void AsmPrinter::PrintHex(int Value) const { 583 O << "0x" << utohexstr(static_cast<unsigned>(Value)); 584} 585 586/// EOL - Print a newline character to asm stream. If a comment is present 587/// then it will be printed first. Comments should not contain '\n'. 588void AsmPrinter::EOL() const { 589 O << '\n'; 590} 591 592void AsmPrinter::EOL(const std::string &Comment) const { 593 if (VerboseAsm && !Comment.empty()) { 594 O << '\t' 595 << TAI->getCommentString() 596 << ' ' 597 << Comment; 598 } 599 O << '\n'; 600} 601 602void AsmPrinter::EOL(const char* Comment) const { 603 if (VerboseAsm && *Comment) { 604 O << '\t' 605 << TAI->getCommentString() 606 << ' ' 607 << Comment; 608 } 609 O << '\n'; 610} 611 612/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an 613/// unsigned leb128 value. 614void AsmPrinter::EmitULEB128Bytes(unsigned Value) const { 615 if (TAI->hasLEB128()) { 616 O << "\t.uleb128\t" 617 << Value; 618 } else { 619 O << TAI->getData8bitsDirective(); 620 PrintULEB128(Value); 621 } 622} 623 624/// EmitSLEB128Bytes - print an assembler byte data directive to compose a 625/// signed leb128 value. 626void AsmPrinter::EmitSLEB128Bytes(int Value) const { 627 if (TAI->hasLEB128()) { 628 O << "\t.sleb128\t" 629 << Value; 630 } else { 631 O << TAI->getData8bitsDirective(); 632 PrintSLEB128(Value); 633 } 634} 635 636/// EmitInt8 - Emit a byte directive and value. 637/// 638void AsmPrinter::EmitInt8(int Value) const { 639 O << TAI->getData8bitsDirective(); 640 PrintHex(Value & 0xFF); 641} 642 643/// EmitInt16 - Emit a short directive and value. 644/// 645void AsmPrinter::EmitInt16(int Value) const { 646 O << TAI->getData16bitsDirective(); 647 PrintHex(Value & 0xFFFF); 648} 649 650/// EmitInt32 - Emit a long directive and value. 651/// 652void AsmPrinter::EmitInt32(int Value) const { 653 O << TAI->getData32bitsDirective(); 654 PrintHex(Value); 655} 656 657/// EmitInt64 - Emit a long long directive and value. 658/// 659void AsmPrinter::EmitInt64(uint64_t Value) const { 660 if (TAI->getData64bitsDirective()) { 661 O << TAI->getData64bitsDirective(); 662 PrintHex(Value); 663 } else { 664 if (TM.getTargetData()->isBigEndian()) { 665 EmitInt32(unsigned(Value >> 32)); O << '\n'; 666 EmitInt32(unsigned(Value)); 667 } else { 668 EmitInt32(unsigned(Value)); O << '\n'; 669 EmitInt32(unsigned(Value >> 32)); 670 } 671 } 672} 673 674/// toOctal - Convert the low order bits of X into an octal digit. 675/// 676static inline char toOctal(int X) { 677 return (X&7)+'0'; 678} 679 680/// printStringChar - Print a char, escaped if necessary. 681/// 682static void printStringChar(raw_ostream &O, char C) { 683 if (C == '"') { 684 O << "\\\""; 685 } else if (C == '\\') { 686 O << "\\\\"; 687 } else if (isprint(C)) { 688 O << C; 689 } else { 690 switch(C) { 691 case '\b': O << "\\b"; break; 692 case '\f': O << "\\f"; break; 693 case '\n': O << "\\n"; break; 694 case '\r': O << "\\r"; break; 695 case '\t': O << "\\t"; break; 696 default: 697 O << '\\'; 698 O << toOctal(C >> 6); 699 O << toOctal(C >> 3); 700 O << toOctal(C >> 0); 701 break; 702 } 703 } 704} 705 706/// EmitString - Emit a string with quotes and a null terminator. 707/// Special characters are emitted properly. 708/// \literal (Eg. '\t') \endliteral 709void AsmPrinter::EmitString(const std::string &String) const { 710 const char* AscizDirective = TAI->getAscizDirective(); 711 if (AscizDirective) 712 O << AscizDirective; 713 else 714 O << TAI->getAsciiDirective(); 715 O << '\"'; 716 for (unsigned i = 0, N = String.size(); i < N; ++i) { 717 unsigned char C = String[i]; 718 printStringChar(O, C); 719 } 720 if (AscizDirective) 721 O << '\"'; 722 else 723 O << "\\0\""; 724} 725 726 727/// EmitFile - Emit a .file directive. 728void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const { 729 O << "\t.file\t" << Number << " \""; 730 for (unsigned i = 0, N = Name.size(); i < N; ++i) { 731 unsigned char C = Name[i]; 732 printStringChar(O, C); 733 } 734 O << '\"'; 735} 736 737 738//===----------------------------------------------------------------------===// 739 740// EmitAlignment - Emit an alignment directive to the specified power of 741// two boundary. For example, if you pass in 3 here, you will get an 8 742// byte alignment. If a global value is specified, and if that global has 743// an explicit alignment requested, it will unconditionally override the 744// alignment request. However, if ForcedAlignBits is specified, this value 745// has final say: the ultimate alignment will be the max of ForcedAlignBits 746// and the alignment computed with NumBits and the global. 747// 748// The algorithm is: 749// Align = NumBits; 750// if (GV && GV->hasalignment) Align = GV->getalignment(); 751// Align = std::max(Align, ForcedAlignBits); 752// 753void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 754 unsigned ForcedAlignBits, 755 bool UseFillExpr) const { 756 if (GV && GV->getAlignment()) 757 NumBits = Log2_32(GV->getAlignment()); 758 NumBits = std::max(NumBits, ForcedAlignBits); 759 760 if (NumBits == 0) return; // No need to emit alignment. 761 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits; 762 O << TAI->getAlignDirective() << NumBits; 763 764 unsigned FillValue = TAI->getTextAlignFillValue(); 765 UseFillExpr &= IsInTextSection && FillValue; 766 if (UseFillExpr) O << ",0x" << utohexstr(FillValue); 767 O << '\n'; 768} 769 770 771/// EmitZeros - Emit a block of zeros. 772/// 773void AsmPrinter::EmitZeros(uint64_t NumZeros) const { 774 if (NumZeros) { 775 if (TAI->getZeroDirective()) { 776 O << TAI->getZeroDirective() << NumZeros; 777 if (TAI->getZeroDirectiveSuffix()) 778 O << TAI->getZeroDirectiveSuffix(); 779 O << '\n'; 780 } else { 781 for (; NumZeros; --NumZeros) 782 O << TAI->getData8bitsDirective() << "0\n"; 783 } 784 } 785} 786 787// Print out the specified constant, without a storage class. Only the 788// constants valid in constant expressions can occur here. 789void AsmPrinter::EmitConstantValueOnly(const Constant *CV) { 790 if (CV->isNullValue() || isa<UndefValue>(CV)) 791 O << '0'; 792 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 793 O << CI->getZExtValue(); 794 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) { 795 // This is a constant address for a global variable or function. Use the 796 // name of the variable or function as the address value, possibly 797 // decorating it with GlobalVarAddrPrefix/Suffix or 798 // FunctionAddrPrefix/Suffix (these all default to "" ) 799 if (isa<Function>(GV)) { 800 O << TAI->getFunctionAddrPrefix() 801 << Mang->getValueName(GV) 802 << TAI->getFunctionAddrSuffix(); 803 } else { 804 O << TAI->getGlobalVarAddrPrefix() 805 << Mang->getValueName(GV) 806 << TAI->getGlobalVarAddrSuffix(); 807 } 808 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { 809 const TargetData *TD = TM.getTargetData(); 810 unsigned Opcode = CE->getOpcode(); 811 switch (Opcode) { 812 case Instruction::GetElementPtr: { 813 // generate a symbolic expression for the byte address 814 const Constant *ptrVal = CE->getOperand(0); 815 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 816 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], 817 idxVec.size())) { 818 if (Offset) 819 O << '('; 820 EmitConstantValueOnly(ptrVal); 821 if (Offset > 0) 822 O << ") + " << Offset; 823 else if (Offset < 0) 824 O << ") - " << -Offset; 825 } else { 826 EmitConstantValueOnly(ptrVal); 827 } 828 break; 829 } 830 case Instruction::Trunc: 831 case Instruction::ZExt: 832 case Instruction::SExt: 833 case Instruction::FPTrunc: 834 case Instruction::FPExt: 835 case Instruction::UIToFP: 836 case Instruction::SIToFP: 837 case Instruction::FPToUI: 838 case Instruction::FPToSI: 839 assert(0 && "FIXME: Don't yet support this kind of constant cast expr"); 840 break; 841 case Instruction::BitCast: 842 return EmitConstantValueOnly(CE->getOperand(0)); 843 844 case Instruction::IntToPtr: { 845 // Handle casts to pointers by changing them into casts to the appropriate 846 // integer type. This promotes constant folding and simplifies this code. 847 Constant *Op = CE->getOperand(0); 848 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/); 849 return EmitConstantValueOnly(Op); 850 } 851 852 853 case Instruction::PtrToInt: { 854 // Support only foldable casts to/from pointers that can be eliminated by 855 // changing the pointer to the appropriately sized integer type. 856 Constant *Op = CE->getOperand(0); 857 const Type *Ty = CE->getType(); 858 859 // We can emit the pointer value into this slot if the slot is an 860 // integer slot greater or equal to the size of the pointer. 861 if (TD->getABITypeSize(Ty) >= TD->getABITypeSize(Op->getType())) 862 return EmitConstantValueOnly(Op); 863 864 O << "(("; 865 EmitConstantValueOnly(Op); 866 APInt ptrMask = APInt::getAllOnesValue(TD->getABITypeSizeInBits(Ty)); 867 868 SmallString<40> S; 869 ptrMask.toStringUnsigned(S); 870 O << ") & " << S.c_str() << ')'; 871 break; 872 } 873 case Instruction::Add: 874 case Instruction::Sub: 875 case Instruction::And: 876 case Instruction::Or: 877 case Instruction::Xor: 878 O << '('; 879 EmitConstantValueOnly(CE->getOperand(0)); 880 O << ')'; 881 switch (Opcode) { 882 case Instruction::Add: 883 O << " + "; 884 break; 885 case Instruction::Sub: 886 O << " - "; 887 break; 888 case Instruction::And: 889 O << " & "; 890 break; 891 case Instruction::Or: 892 O << " | "; 893 break; 894 case Instruction::Xor: 895 O << " ^ "; 896 break; 897 default: 898 break; 899 } 900 O << '('; 901 EmitConstantValueOnly(CE->getOperand(1)); 902 O << ')'; 903 break; 904 default: 905 assert(0 && "Unsupported operator!"); 906 } 907 } else { 908 assert(0 && "Unknown constant value!"); 909 } 910} 911 912/// printAsCString - Print the specified array as a C compatible string, only if 913/// the predicate isString is true. 914/// 915static void printAsCString(raw_ostream &O, const ConstantArray *CVA, 916 unsigned LastElt) { 917 assert(CVA->isString() && "Array is not string compatible!"); 918 919 O << '\"'; 920 for (unsigned i = 0; i != LastElt; ++i) { 921 unsigned char C = 922 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue(); 923 printStringChar(O, C); 924 } 925 O << '\"'; 926} 927 928/// EmitString - Emit a zero-byte-terminated string constant. 929/// 930void AsmPrinter::EmitString(const ConstantArray *CVA) const { 931 unsigned NumElts = CVA->getNumOperands(); 932 if (TAI->getAscizDirective() && NumElts && 933 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) { 934 O << TAI->getAscizDirective(); 935 printAsCString(O, CVA, NumElts-1); 936 } else { 937 O << TAI->getAsciiDirective(); 938 printAsCString(O, CVA, NumElts); 939 } 940 O << '\n'; 941} 942 943/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 944void AsmPrinter::EmitGlobalConstant(const Constant *CV) { 945 const TargetData *TD = TM.getTargetData(); 946 unsigned Size = TD->getABITypeSize(CV->getType()); 947 948 if (CV->isNullValue() || isa<UndefValue>(CV)) { 949 EmitZeros(Size); 950 return; 951 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) { 952 if (CVA->isString()) { 953 EmitString(CVA); 954 } else { // Not a string. Print the values in successive locations 955 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) 956 EmitGlobalConstant(CVA->getOperand(i)); 957 } 958 return; 959 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) { 960 // Print the fields in successive locations. Pad to align if needed! 961 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType()); 962 uint64_t sizeSoFar = 0; 963 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) { 964 const Constant* field = CVS->getOperand(i); 965 966 // Check if padding is needed and insert one or more 0s. 967 uint64_t fieldSize = TD->getABITypeSize(field->getType()); 968 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1)) 969 - cvsLayout->getElementOffset(i)) - fieldSize; 970 sizeSoFar += fieldSize + padSize; 971 972 // Now print the actual field value. 973 EmitGlobalConstant(field); 974 975 // Insert padding - this may include padding to increase the size of the 976 // current field up to the ABI size (if the struct is not packed) as well 977 // as padding to ensure that the next field starts at the right offset. 978 EmitZeros(padSize); 979 } 980 assert(sizeSoFar == cvsLayout->getSizeInBytes() && 981 "Layout of constant struct may be incorrect!"); 982 return; 983 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) { 984 // FP Constants are printed as integer constants to avoid losing 985 // precision... 986 if (CFP->getType() == Type::DoubleTy) { 987 double Val = CFP->getValueAPF().convertToDouble(); // for comment only 988 uint64_t i = CFP->getValueAPF().convertToAPInt().getZExtValue(); 989 if (TAI->getData64bitsDirective()) 990 O << TAI->getData64bitsDirective() << i << '\t' 991 << TAI->getCommentString() << " double value: " << Val << '\n'; 992 else if (TD->isBigEndian()) { 993 O << TAI->getData32bitsDirective() << unsigned(i >> 32) 994 << '\t' << TAI->getCommentString() 995 << " double most significant word " << Val << '\n'; 996 O << TAI->getData32bitsDirective() << unsigned(i) 997 << '\t' << TAI->getCommentString() 998 << " double least significant word " << Val << '\n'; 999 } else { 1000 O << TAI->getData32bitsDirective() << unsigned(i) 1001 << '\t' << TAI->getCommentString() 1002 << " double least significant word " << Val << '\n'; 1003 O << TAI->getData32bitsDirective() << unsigned(i >> 32) 1004 << '\t' << TAI->getCommentString() 1005 << " double most significant word " << Val << '\n'; 1006 } 1007 return; 1008 } else if (CFP->getType() == Type::FloatTy) { 1009 float Val = CFP->getValueAPF().convertToFloat(); // for comment only 1010 O << TAI->getData32bitsDirective() 1011 << CFP->getValueAPF().convertToAPInt().getZExtValue() 1012 << '\t' << TAI->getCommentString() << " float " << Val << '\n'; 1013 return; 1014 } else if (CFP->getType() == Type::X86_FP80Ty) { 1015 // all long double variants are printed as hex 1016 // api needed to prevent premature destruction 1017 APInt api = CFP->getValueAPF().convertToAPInt(); 1018 const uint64_t *p = api.getRawData(); 1019 APFloat DoubleVal = CFP->getValueAPF(); 1020 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven); 1021 if (TD->isBigEndian()) { 1022 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48) 1023 << '\t' << TAI->getCommentString() 1024 << " long double most significant halfword of ~" 1025 << DoubleVal.convertToDouble() << '\n'; 1026 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32) 1027 << '\t' << TAI->getCommentString() 1028 << " long double next halfword\n"; 1029 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16) 1030 << '\t' << TAI->getCommentString() 1031 << " long double next halfword\n"; 1032 O << TAI->getData16bitsDirective() << uint16_t(p[0]) 1033 << '\t' << TAI->getCommentString() 1034 << " long double next halfword\n"; 1035 O << TAI->getData16bitsDirective() << uint16_t(p[1]) 1036 << '\t' << TAI->getCommentString() 1037 << " long double least significant halfword\n"; 1038 } else { 1039 O << TAI->getData16bitsDirective() << uint16_t(p[1]) 1040 << '\t' << TAI->getCommentString() 1041 << " long double least significant halfword of ~" 1042 << DoubleVal.convertToDouble() << '\n'; 1043 O << TAI->getData16bitsDirective() << uint16_t(p[0]) 1044 << '\t' << TAI->getCommentString() 1045 << " long double next halfword\n"; 1046 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16) 1047 << '\t' << TAI->getCommentString() 1048 << " long double next halfword\n"; 1049 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32) 1050 << '\t' << TAI->getCommentString() 1051 << " long double next halfword\n"; 1052 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48) 1053 << '\t' << TAI->getCommentString() 1054 << " long double most significant halfword\n"; 1055 } 1056 EmitZeros(Size - TD->getTypeStoreSize(Type::X86_FP80Ty)); 1057 return; 1058 } else if (CFP->getType() == Type::PPC_FP128Ty) { 1059 // all long double variants are printed as hex 1060 // api needed to prevent premature destruction 1061 APInt api = CFP->getValueAPF().convertToAPInt(); 1062 const uint64_t *p = api.getRawData(); 1063 if (TD->isBigEndian()) { 1064 O << TAI->getData32bitsDirective() << uint32_t(p[0] >> 32) 1065 << '\t' << TAI->getCommentString() 1066 << " long double most significant word\n"; 1067 O << TAI->getData32bitsDirective() << uint32_t(p[0]) 1068 << '\t' << TAI->getCommentString() 1069 << " long double next word\n"; 1070 O << TAI->getData32bitsDirective() << uint32_t(p[1] >> 32) 1071 << '\t' << TAI->getCommentString() 1072 << " long double next word\n"; 1073 O << TAI->getData32bitsDirective() << uint32_t(p[1]) 1074 << '\t' << TAI->getCommentString() 1075 << " long double least significant word\n"; 1076 } else { 1077 O << TAI->getData32bitsDirective() << uint32_t(p[1]) 1078 << '\t' << TAI->getCommentString() 1079 << " long double least significant word\n"; 1080 O << TAI->getData32bitsDirective() << uint32_t(p[1] >> 32) 1081 << '\t' << TAI->getCommentString() 1082 << " long double next word\n"; 1083 O << TAI->getData32bitsDirective() << uint32_t(p[0]) 1084 << '\t' << TAI->getCommentString() 1085 << " long double next word\n"; 1086 O << TAI->getData32bitsDirective() << uint32_t(p[0] >> 32) 1087 << '\t' << TAI->getCommentString() 1088 << " long double most significant word\n"; 1089 } 1090 return; 1091 } else assert(0 && "Floating point constant type not handled"); 1092 } else if (CV->getType()->isInteger() && 1093 cast<IntegerType>(CV->getType())->getBitWidth() >= 64) { 1094 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1095 unsigned BitWidth = CI->getBitWidth(); 1096 assert(isPowerOf2_32(BitWidth) && 1097 "Non-power-of-2-sized integers not handled!"); 1098 1099 // We don't expect assemblers to support integer data directives 1100 // for more than 64 bits, so we emit the data in at most 64-bit 1101 // quantities at a time. 1102 const uint64_t *RawData = CI->getValue().getRawData(); 1103 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1104 uint64_t Val; 1105 if (TD->isBigEndian()) 1106 Val = RawData[e - i - 1]; 1107 else 1108 Val = RawData[i]; 1109 1110 if (TAI->getData64bitsDirective()) 1111 O << TAI->getData64bitsDirective() << Val << '\n'; 1112 else if (TD->isBigEndian()) { 1113 O << TAI->getData32bitsDirective() << unsigned(Val >> 32) 1114 << '\t' << TAI->getCommentString() 1115 << " Double-word most significant word " << Val << '\n'; 1116 O << TAI->getData32bitsDirective() << unsigned(Val) 1117 << '\t' << TAI->getCommentString() 1118 << " Double-word least significant word " << Val << '\n'; 1119 } else { 1120 O << TAI->getData32bitsDirective() << unsigned(Val) 1121 << '\t' << TAI->getCommentString() 1122 << " Double-word least significant word " << Val << '\n'; 1123 O << TAI->getData32bitsDirective() << unsigned(Val >> 32) 1124 << '\t' << TAI->getCommentString() 1125 << " Double-word most significant word " << Val << '\n'; 1126 } 1127 } 1128 return; 1129 } 1130 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) { 1131 const VectorType *PTy = CP->getType(); 1132 1133 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I) 1134 EmitGlobalConstant(CP->getOperand(I)); 1135 1136 return; 1137 } 1138 1139 const Type *type = CV->getType(); 1140 printDataDirective(type); 1141 EmitConstantValueOnly(CV); 1142 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1143 SmallString<40> S; 1144 CI->getValue().toStringUnsigned(S, 16); 1145 O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str(); 1146 } 1147 O << '\n'; 1148} 1149 1150void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1151 // Target doesn't support this yet! 1152 abort(); 1153} 1154 1155/// PrintSpecial - Print information related to the specified machine instr 1156/// that is independent of the operand, and may be independent of the instr 1157/// itself. This can be useful for portably encoding the comment character 1158/// or other bits of target-specific knowledge into the asmstrings. The 1159/// syntax used is ${:comment}. Targets can override this to add support 1160/// for their own strange codes. 1161void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) { 1162 if (!strcmp(Code, "private")) { 1163 O << TAI->getPrivateGlobalPrefix(); 1164 } else if (!strcmp(Code, "comment")) { 1165 O << TAI->getCommentString(); 1166 } else if (!strcmp(Code, "uid")) { 1167 // Assign a unique ID to this machine instruction. 1168 static const MachineInstr *LastMI = 0; 1169 static const Function *F = 0; 1170 static unsigned Counter = 0U-1; 1171 1172 // Comparing the address of MI isn't sufficient, because machineinstrs may 1173 // be allocated to the same address across functions. 1174 const Function *ThisF = MI->getParent()->getParent()->getFunction(); 1175 1176 // If this is a new machine instruction, bump the counter. 1177 if (LastMI != MI || F != ThisF) { 1178 ++Counter; 1179 LastMI = MI; 1180 F = ThisF; 1181 } 1182 O << Counter; 1183 } else { 1184 cerr << "Unknown special formatter '" << Code 1185 << "' for machine instr: " << *MI; 1186 exit(1); 1187 } 1188} 1189 1190 1191/// printInlineAsm - This method formats and prints the specified machine 1192/// instruction that is an inline asm. 1193void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { 1194 unsigned NumOperands = MI->getNumOperands(); 1195 1196 // Count the number of register definitions. 1197 unsigned NumDefs = 0; 1198 for (; MI->getOperand(NumDefs).isRegister() && MI->getOperand(NumDefs).isDef(); 1199 ++NumDefs) 1200 assert(NumDefs != NumOperands-1 && "No asm string?"); 1201 1202 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?"); 1203 1204 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. 1205 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); 1206 1207 // If this asmstr is empty, just print the #APP/#NOAPP markers. 1208 // These are useful to see where empty asm's wound up. 1209 if (AsmStr[0] == 0) { 1210 O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n'; 1211 return; 1212 } 1213 1214 O << TAI->getInlineAsmStart() << "\n\t"; 1215 1216 // The variant of the current asmprinter. 1217 int AsmPrinterVariant = TAI->getAssemblerDialect(); 1218 1219 int CurVariant = -1; // The number of the {.|.|.} region we are in. 1220 const char *LastEmitted = AsmStr; // One past the last character emitted. 1221 1222 while (*LastEmitted) { 1223 switch (*LastEmitted) { 1224 default: { 1225 // Not a special case, emit the string section literally. 1226 const char *LiteralEnd = LastEmitted+1; 1227 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && 1228 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') 1229 ++LiteralEnd; 1230 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1231 O.write(LastEmitted, LiteralEnd-LastEmitted); 1232 LastEmitted = LiteralEnd; 1233 break; 1234 } 1235 case '\n': 1236 ++LastEmitted; // Consume newline character. 1237 O << '\n'; // Indent code with newline. 1238 break; 1239 case '$': { 1240 ++LastEmitted; // Consume '$' character. 1241 bool Done = true; 1242 1243 // Handle escapes. 1244 switch (*LastEmitted) { 1245 default: Done = false; break; 1246 case '$': // $$ -> $ 1247 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1248 O << '$'; 1249 ++LastEmitted; // Consume second '$' character. 1250 break; 1251 case '(': // $( -> same as GCC's { character. 1252 ++LastEmitted; // Consume '(' character. 1253 if (CurVariant != -1) { 1254 cerr << "Nested variants found in inline asm string: '" 1255 << AsmStr << "'\n"; 1256 exit(1); 1257 } 1258 CurVariant = 0; // We're in the first variant now. 1259 break; 1260 case '|': 1261 ++LastEmitted; // consume '|' character. 1262 if (CurVariant == -1) { 1263 cerr << "Found '|' character outside of variant in inline asm " 1264 << "string: '" << AsmStr << "'\n"; 1265 exit(1); 1266 } 1267 ++CurVariant; // We're in the next variant. 1268 break; 1269 case ')': // $) -> same as GCC's } char. 1270 ++LastEmitted; // consume ')' character. 1271 if (CurVariant == -1) { 1272 cerr << "Found '}' character outside of variant in inline asm " 1273 << "string: '" << AsmStr << "'\n"; 1274 exit(1); 1275 } 1276 CurVariant = -1; 1277 break; 1278 } 1279 if (Done) break; 1280 1281 bool HasCurlyBraces = false; 1282 if (*LastEmitted == '{') { // ${variable} 1283 ++LastEmitted; // Consume '{' character. 1284 HasCurlyBraces = true; 1285 } 1286 1287 const char *IDStart = LastEmitted; 1288 char *IDEnd; 1289 errno = 0; 1290 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. 1291 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { 1292 cerr << "Bad $ operand number in inline asm string: '" 1293 << AsmStr << "'\n"; 1294 exit(1); 1295 } 1296 LastEmitted = IDEnd; 1297 1298 char Modifier[2] = { 0, 0 }; 1299 1300 if (HasCurlyBraces) { 1301 // If we have curly braces, check for a modifier character. This 1302 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. 1303 if (*LastEmitted == ':') { 1304 ++LastEmitted; // Consume ':' character. 1305 if (*LastEmitted == 0) { 1306 cerr << "Bad ${:} expression in inline asm string: '" 1307 << AsmStr << "'\n"; 1308 exit(1); 1309 } 1310 1311 Modifier[0] = *LastEmitted; 1312 ++LastEmitted; // Consume modifier character. 1313 } 1314 1315 if (*LastEmitted != '}') { 1316 cerr << "Bad ${} expression in inline asm string: '" 1317 << AsmStr << "'\n"; 1318 exit(1); 1319 } 1320 ++LastEmitted; // Consume '}' character. 1321 } 1322 1323 if ((unsigned)Val >= NumOperands-1) { 1324 cerr << "Invalid $ operand number in inline asm string: '" 1325 << AsmStr << "'\n"; 1326 exit(1); 1327 } 1328 1329 // Okay, we finally have a value number. Ask the target to print this 1330 // operand! 1331 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { 1332 unsigned OpNo = 1; 1333 1334 bool Error = false; 1335 1336 // Scan to find the machine operand number for the operand. 1337 for (; Val; --Val) { 1338 if (OpNo >= MI->getNumOperands()) break; 1339 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1340 OpNo += (OpFlags >> 3) + 1; 1341 } 1342 1343 if (OpNo >= MI->getNumOperands()) { 1344 Error = true; 1345 } else { 1346 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1347 ++OpNo; // Skip over the ID number. 1348 1349 if (Modifier[0]=='l') // labels are target independent 1350 printBasicBlockLabel(MI->getOperand(OpNo).getMBB(), 1351 false, false, false); 1352 else { 1353 AsmPrinter *AP = const_cast<AsmPrinter*>(this); 1354 if ((OpFlags & 7) == 4) { 1355 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, 1356 Modifier[0] ? Modifier : 0); 1357 } else { 1358 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, 1359 Modifier[0] ? Modifier : 0); 1360 } 1361 } 1362 } 1363 if (Error) { 1364 cerr << "Invalid operand found in inline asm: '" 1365 << AsmStr << "'\n"; 1366 MI->dump(); 1367 exit(1); 1368 } 1369 } 1370 break; 1371 } 1372 } 1373 } 1374 O << "\n\t" << TAI->getInlineAsmEnd() << '\n'; 1375} 1376 1377/// printImplicitDef - This method prints the specified machine instruction 1378/// that is an implicit def. 1379void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { 1380 O << '\t' << TAI->getCommentString() << " implicit-def: " 1381 << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n'; 1382} 1383 1384/// printLabel - This method prints a local label used by debug and 1385/// exception handling tables. 1386void AsmPrinter::printLabel(const MachineInstr *MI) const { 1387 printLabel(MI->getOperand(0).getImm()); 1388} 1389 1390void AsmPrinter::printLabel(unsigned Id) const { 1391 O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n"; 1392} 1393 1394/// printDeclare - This method prints a local variable declaration used by 1395/// debug tables. 1396/// FIXME: It doesn't really print anything rather it inserts a DebugVariable 1397/// entry into dwarf table. 1398void AsmPrinter::printDeclare(const MachineInstr *MI) const { 1399 int FI = MI->getOperand(0).getIndex(); 1400 GlobalValue *GV = MI->getOperand(1).getGlobal(); 1401 MMI->RecordVariable(GV, FI); 1402} 1403 1404/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 1405/// instruction, using the specified assembler variant. Targets should 1406/// overried this to format as appropriate. 1407bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 1408 unsigned AsmVariant, const char *ExtraCode) { 1409 // Target doesn't support this yet! 1410 return true; 1411} 1412 1413bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 1414 unsigned AsmVariant, 1415 const char *ExtraCode) { 1416 // Target doesn't support this yet! 1417 return true; 1418} 1419 1420/// printBasicBlockLabel - This method prints the label for the specified 1421/// MachineBasicBlock 1422void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB, 1423 bool printAlign, 1424 bool printColon, 1425 bool printComment) const { 1426 if (printAlign) { 1427 unsigned Align = MBB->getAlignment(); 1428 if (Align) 1429 EmitAlignment(Log2_32(Align)); 1430 } 1431 1432 O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_' 1433 << MBB->getNumber(); 1434 if (printColon) 1435 O << ':'; 1436 if (printComment && MBB->getBasicBlock()) 1437 O << '\t' << TAI->getCommentString() << ' ' 1438 << MBB->getBasicBlock()->getNameStart(); 1439} 1440 1441/// printPICJumpTableSetLabel - This method prints a set label for the 1442/// specified MachineBasicBlock for a jumptable entry. 1443void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, 1444 const MachineBasicBlock *MBB) const { 1445 if (!TAI->getSetDirective()) 1446 return; 1447 1448 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix() 1449 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','; 1450 printBasicBlockLabel(MBB, false, false, false); 1451 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1452 << '_' << uid << '\n'; 1453} 1454 1455void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2, 1456 const MachineBasicBlock *MBB) const { 1457 if (!TAI->getSetDirective()) 1458 return; 1459 1460 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix() 1461 << getFunctionNumber() << '_' << uid << '_' << uid2 1462 << "_set_" << MBB->getNumber() << ','; 1463 printBasicBlockLabel(MBB, false, false, false); 1464 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1465 << '_' << uid << '_' << uid2 << '\n'; 1466} 1467 1468/// printDataDirective - This method prints the asm directive for the 1469/// specified type. 1470void AsmPrinter::printDataDirective(const Type *type) { 1471 const TargetData *TD = TM.getTargetData(); 1472 switch (type->getTypeID()) { 1473 case Type::IntegerTyID: { 1474 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth(); 1475 if (BitWidth <= 8) 1476 O << TAI->getData8bitsDirective(); 1477 else if (BitWidth <= 16) 1478 O << TAI->getData16bitsDirective(); 1479 else if (BitWidth <= 32) 1480 O << TAI->getData32bitsDirective(); 1481 else if (BitWidth <= 64) { 1482 assert(TAI->getData64bitsDirective() && 1483 "Target cannot handle 64-bit constant exprs!"); 1484 O << TAI->getData64bitsDirective(); 1485 } else { 1486 assert(0 && "Target cannot handle given data directive width!"); 1487 } 1488 break; 1489 } 1490 case Type::PointerTyID: 1491 if (TD->getPointerSize() == 8) { 1492 assert(TAI->getData64bitsDirective() && 1493 "Target cannot handle 64-bit pointer exprs!"); 1494 O << TAI->getData64bitsDirective(); 1495 } else { 1496 O << TAI->getData32bitsDirective(); 1497 } 1498 break; 1499 case Type::FloatTyID: case Type::DoubleTyID: 1500 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID: 1501 assert (0 && "Should have already output floating point constant."); 1502 default: 1503 assert (0 && "Can't handle printing this type of thing"); 1504 break; 1505 } 1506} 1507 1508void AsmPrinter::printSuffixedName(const char *Name, const char *Suffix, 1509 const char *Prefix) { 1510 if (Name[0]=='\"') 1511 O << '\"'; 1512 O << TAI->getPrivateGlobalPrefix(); 1513 if (Prefix) O << Prefix; 1514 if (Name[0]=='\"') 1515 O << '\"'; 1516 if (Name[0]=='\"') 1517 O << Name[1]; 1518 else 1519 O << Name; 1520 O << Suffix; 1521 if (Name[0]=='\"') 1522 O << '\"'; 1523} 1524 1525void AsmPrinter::printSuffixedName(const std::string &Name, const char* Suffix) { 1526 printSuffixedName(Name.c_str(), Suffix); 1527} 1528 1529void AsmPrinter::printVisibility(const std::string& Name, 1530 unsigned Visibility) const { 1531 if (Visibility == GlobalValue::HiddenVisibility) { 1532 if (const char *Directive = TAI->getHiddenDirective()) 1533 O << Directive << Name << '\n'; 1534 } else if (Visibility == GlobalValue::ProtectedVisibility) { 1535 if (const char *Directive = TAI->getProtectedDirective()) 1536 O << Directive << Name << '\n'; 1537 } 1538} 1539 1540GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1541 if (!S->usesMetadata()) 1542 return 0; 1543 1544 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1545 if (GCPI != GCMetadataPrinters.end()) 1546 return GCPI->second; 1547 1548 const char *Name = S->getName().c_str(); 1549 1550 for (GCMetadataPrinterRegistry::iterator 1551 I = GCMetadataPrinterRegistry::begin(), 1552 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1553 if (strcmp(Name, I->getName()) == 0) { 1554 GCMetadataPrinter *GMP = I->instantiate(); 1555 GMP->S = S; 1556 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1557 return GMP; 1558 } 1559 1560 cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n"; 1561 abort(); 1562} 1563