AsmPrinter.cpp revision 67e59834fc1dca7e357c40af2e5144f3d62f5133
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/Analysis/DebugInfo.h" 25#include "llvm/MC/MCInst.h" 26#include "llvm/Support/CommandLine.h" 27#include "llvm/Support/ErrorHandling.h" 28#include "llvm/Support/FormattedStream.h" 29#include "llvm/Support/Mangler.h" 30#include "llvm/Target/TargetAsmInfo.h" 31#include "llvm/Target/TargetData.h" 32#include "llvm/Target/TargetLowering.h" 33#include "llvm/Target/TargetOptions.h" 34#include "llvm/Target/TargetRegisterInfo.h" 35#include "llvm/ADT/SmallPtrSet.h" 36#include "llvm/ADT/SmallString.h" 37#include "llvm/ADT/StringExtras.h" 38#include <cerrno> 39using namespace llvm; 40 41static cl::opt<cl::boolOrDefault> 42AsmVerbose("asm-verbose", cl::desc("Add comments to directives."), 43 cl::init(cl::BOU_UNSET)); 44 45char AsmPrinter::ID = 0; 46AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm, 47 const TargetAsmInfo *T, bool VDef) 48 : MachineFunctionPass(&ID), FunctionNumber(0), O(o), 49 TM(tm), TAI(T), TRI(tm.getRegisterInfo()), 50 IsInTextSection(false), LastMI(0), LastFn(0), Counter(~0U), 51 PrevDLT(0, ~0U, ~0U) { 52 DW = 0; MMI = 0; 53 switch (AsmVerbose) { 54 case cl::BOU_UNSET: VerboseAsm = VDef; break; 55 case cl::BOU_TRUE: VerboseAsm = true; break; 56 case cl::BOU_FALSE: VerboseAsm = false; break; 57 } 58} 59 60AsmPrinter::~AsmPrinter() { 61 for (gcp_iterator I = GCMetadataPrinters.begin(), 62 E = GCMetadataPrinters.end(); I != E; ++I) 63 delete I->second; 64} 65 66/// SwitchToTextSection - Switch to the specified text section of the executable 67/// if we are not already in it! 68/// 69void AsmPrinter::SwitchToTextSection(const char *NewSection, 70 const GlobalValue *GV) { 71 std::string NS; 72 if (GV && GV->hasSection()) 73 NS = TAI->getSwitchToSectionDirective() + GV->getSection(); 74 else 75 NS = NewSection; 76 77 // If we're already in this section, we're done. 78 if (CurrentSection == NS) return; 79 80 // Close the current section, if applicable. 81 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) 82 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; 83 84 CurrentSection = NS; 85 86 if (!CurrentSection.empty()) 87 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n'; 88 89 IsInTextSection = true; 90} 91 92/// SwitchToDataSection - Switch to the specified data section of the executable 93/// if we are not already in it! 94/// 95void AsmPrinter::SwitchToDataSection(const char *NewSection, 96 const GlobalValue *GV) { 97 std::string NS; 98 if (GV && GV->hasSection()) 99 NS = TAI->getSwitchToSectionDirective() + GV->getSection(); 100 else 101 NS = NewSection; 102 103 // If we're already in this section, we're done. 104 if (CurrentSection == NS) return; 105 106 // Close the current section, if applicable. 107 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) 108 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; 109 110 CurrentSection = NS; 111 112 if (!CurrentSection.empty()) 113 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n'; 114 115 IsInTextSection = false; 116} 117 118/// SwitchToSection - Switch to the specified section of the executable if we 119/// are not already in it! 120void AsmPrinter::SwitchToSection(const Section* NS) { 121 const std::string& NewSection = NS->getName(); 122 123 // If we're already in this section, we're done. 124 if (CurrentSection == NewSection) return; 125 126 // Close the current section, if applicable. 127 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty()) 128 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n'; 129 130 // FIXME: Make CurrentSection a Section* in the future 131 CurrentSection = NewSection; 132 CurrentSection_ = NS; 133 134 if (!CurrentSection.empty()) { 135 // If section is named we need to switch into it via special '.section' 136 // directive and also append funky flags. Otherwise - section name is just 137 // some magic assembler directive. 138 if (NS->isNamed()) 139 O << TAI->getSwitchToSectionDirective() 140 << CurrentSection 141 << TAI->getSectionFlags(NS->getFlags()); 142 else 143 O << CurrentSection; 144 O << TAI->getDataSectionStartSuffix() << '\n'; 145 } 146 147 IsInTextSection = (NS->getFlags() & SectionFlags::Code); 148} 149 150void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const { 151 MachineFunctionPass::getAnalysisUsage(AU); 152 AU.addRequired<GCModuleInfo>(); 153} 154 155bool AsmPrinter::doInitialization(Module &M) { 156 Mang = new Mangler(M, TAI->getGlobalPrefix(), TAI->getPrivateGlobalPrefix(), 157 TAI->getLinkerPrivateGlobalPrefix()); 158 159 if (TAI->doesAllowQuotesInName()) 160 Mang->setUseQuotes(true); 161 162 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 163 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 164 165 if (TAI->hasSingleParameterDotFile()) { 166 /* Very minimal debug info. It is ignored if we emit actual 167 debug info. If we don't, this at helps the user find where 168 a function came from. */ 169 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n"; 170 } 171 172 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I) 173 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I)) 174 MP->beginAssembly(O, *this, *TAI); 175 176 if (!M.getModuleInlineAsm().empty()) 177 O << TAI->getCommentString() << " Start of file scope inline assembly\n" 178 << M.getModuleInlineAsm() 179 << '\n' << TAI->getCommentString() 180 << " End of file scope inline assembly\n"; 181 182 SwitchToDataSection(""); // Reset back to no section. 183 184 if (TAI->doesSupportDebugInformation() || 185 TAI->doesSupportExceptionHandling()) { 186 MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 187 if (MMI) 188 MMI->AnalyzeModule(M); 189 DW = getAnalysisIfAvailable<DwarfWriter>(); 190 if (DW) 191 DW->BeginModule(&M, MMI, O, this, TAI); 192 } 193 194 return false; 195} 196 197bool AsmPrinter::doFinalization(Module &M) { 198 // Emit global variables. 199 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 200 I != E; ++I) 201 PrintGlobalVariable(I); 202 203 // Emit final debug information. 204 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling()) 205 DW->EndModule(); 206 207 // If the target wants to know about weak references, print them all. 208 if (TAI->getWeakRefDirective()) { 209 // FIXME: This is not lazy, it would be nice to only print weak references 210 // to stuff that is actually used. Note that doing so would require targets 211 // to notice uses in operands (due to constant exprs etc). This should 212 // happen with the MC stuff eventually. 213 SwitchToDataSection(""); 214 215 // Print out module-level global variables here. 216 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 217 I != E; ++I) { 218 if (I->hasExternalWeakLinkage()) 219 O << TAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n'; 220 } 221 222 for (Module::const_iterator I = M.begin(), E = M.end(); 223 I != E; ++I) { 224 if (I->hasExternalWeakLinkage()) 225 O << TAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n'; 226 } 227 } 228 229 if (TAI->getSetDirective()) { 230 if (!M.alias_empty()) 231 SwitchToSection(TAI->getTextSection()); 232 233 O << '\n'; 234 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end(); 235 I != E; ++I) { 236 std::string Name = Mang->getMangledName(I); 237 238 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal()); 239 std::string Target = Mang->getMangledName(GV); 240 241 if (I->hasExternalLinkage() || !TAI->getWeakRefDirective()) 242 O << "\t.globl\t" << Name << '\n'; 243 else if (I->hasWeakLinkage()) 244 O << TAI->getWeakRefDirective() << Name << '\n'; 245 else if (!I->hasLocalLinkage()) 246 llvm_unreachable("Invalid alias linkage"); 247 248 printVisibility(Name, I->getVisibility()); 249 250 O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n'; 251 } 252 } 253 254 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>(); 255 assert(MI && "AsmPrinter didn't require GCModuleInfo?"); 256 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; ) 257 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I)) 258 MP->finishAssembly(O, *this, *TAI); 259 260 // If we don't have any trampolines, then we don't require stack memory 261 // to be executable. Some targets have a directive to declare this. 262 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline"); 263 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty()) 264 if (TAI->getNonexecutableStackDirective()) 265 O << TAI->getNonexecutableStackDirective() << '\n'; 266 267 delete Mang; Mang = 0; 268 DW = 0; MMI = 0; 269 return false; 270} 271 272std::string 273AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) const { 274 assert(MF && "No machine function?"); 275 return Mang->getMangledName(MF->getFunction(), ".eh", 276 TAI->is_EHSymbolPrivate()); 277} 278 279void AsmPrinter::SetupMachineFunction(MachineFunction &MF) { 280 // What's my mangled name? 281 CurrentFnName = Mang->getMangledName(MF.getFunction()); 282 IncrementFunctionNumber(); 283} 284 285namespace { 286 // SectionCPs - Keep track the alignment, constpool entries per Section. 287 struct SectionCPs { 288 const Section *S; 289 unsigned Alignment; 290 SmallVector<unsigned, 4> CPEs; 291 SectionCPs(const Section *s, unsigned a) : S(s), Alignment(a) {}; 292 }; 293} 294 295/// EmitConstantPool - Print to the current output stream assembly 296/// representations of the constants in the constant pool MCP. This is 297/// used to print out constants which have been "spilled to memory" by 298/// the code generator. 299/// 300void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) { 301 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants(); 302 if (CP.empty()) return; 303 304 const TargetData &TD = *TM.getTargetData(); 305 306 // Calculate sections for constant pool entries. We collect entries to go into 307 // the same section together to reduce amount of section switch statements. 308 SmallVector<SectionCPs, 4> CPSections; 309 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 310 const MachineConstantPoolEntry &CPE = CP[i]; 311 unsigned Align = CPE.getAlignment(); 312 uint64_t Size = TD.getTypeAllocSize(CPE.getType()); 313 const Section *S = 314 TAI->getSectionForMergableConstant(Size, CPE.getRelocationInfo()); 315 316 // The number of sections are small, just do a linear search from the 317 // last section to the first. 318 bool Found = false; 319 unsigned SecIdx = CPSections.size(); 320 while (SecIdx != 0) { 321 if (CPSections[--SecIdx].S == S) { 322 Found = true; 323 break; 324 } 325 } 326 if (!Found) { 327 SecIdx = CPSections.size(); 328 CPSections.push_back(SectionCPs(S, Align)); 329 } 330 331 if (Align > CPSections[SecIdx].Alignment) 332 CPSections[SecIdx].Alignment = Align; 333 CPSections[SecIdx].CPEs.push_back(i); 334 } 335 336 // Now print stuff into the calculated sections. 337 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) { 338 SwitchToSection(CPSections[i].S); 339 EmitAlignment(Log2_32(CPSections[i].Alignment)); 340 341 unsigned Offset = 0; 342 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) { 343 unsigned CPI = CPSections[i].CPEs[j]; 344 MachineConstantPoolEntry CPE = CP[CPI]; 345 346 // Emit inter-object padding for alignment. 347 unsigned AlignMask = CPE.getAlignment() - 1; 348 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask; 349 EmitZeros(NewOffset - Offset); 350 351 const Type *Ty = CPE.getType(); 352 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty); 353 354 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' 355 << CPI << ":\t\t\t\t\t"; 356 if (VerboseAsm) { 357 O << TAI->getCommentString() << ' '; 358 WriteTypeSymbolic(O, CPE.getType(), 0); 359 } 360 O << '\n'; 361 if (CPE.isMachineConstantPoolEntry()) 362 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal); 363 else 364 EmitGlobalConstant(CPE.Val.ConstVal); 365 } 366 } 367} 368 369/// EmitJumpTableInfo - Print assembly representations of the jump tables used 370/// by the current function to the current output stream. 371/// 372void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI, 373 MachineFunction &MF) { 374 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 375 if (JT.empty()) return; 376 377 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 378 379 // Pick the directive to use to print the jump table entries, and switch to 380 // the appropriate section. 381 TargetLowering *LoweringInfo = TM.getTargetLowering(); 382 383 const char* JumpTableDataSection = TAI->getJumpTableDataSection(); 384 const Function *F = MF.getFunction(); 385 unsigned SectionFlags = TAI->SectionFlagsForGlobal(F); 386 bool JTInDiffSection = false; 387 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) || 388 !JumpTableDataSection || 389 SectionFlags & SectionFlags::Linkonce) { 390 // In PIC mode, we need to emit the jump table to the same section as the 391 // function body itself, otherwise the label differences won't make sense. 392 // We should also do if the section name is NULL or function is declared in 393 // discardable section. 394 SwitchToSection(TAI->SectionForGlobal(F)); 395 } else { 396 SwitchToDataSection(JumpTableDataSection); 397 JTInDiffSection = true; 398 } 399 400 EmitAlignment(Log2_32(MJTI->getAlignment())); 401 402 for (unsigned i = 0, e = JT.size(); i != e; ++i) { 403 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs; 404 405 // If this jump table was deleted, ignore it. 406 if (JTBBs.empty()) continue; 407 408 // For PIC codegen, if possible we want to use the SetDirective to reduce 409 // the number of relocations the assembler will generate for the jump table. 410 // Set directives are all printed before the jump table itself. 411 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets; 412 if (TAI->getSetDirective() && IsPic) 413 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) 414 if (EmittedSets.insert(JTBBs[ii])) 415 printPICJumpTableSetLabel(i, JTBBs[ii]); 416 417 // On some targets (e.g. darwin) we want to emit two consequtive labels 418 // before each jump table. The first label is never referenced, but tells 419 // the assembler and linker the extents of the jump table object. The 420 // second label is actually referenced by the code. 421 if (JTInDiffSection) { 422 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix()) 423 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n"; 424 } 425 426 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 427 << '_' << i << ":\n"; 428 429 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) { 430 printPICJumpTableEntry(MJTI, JTBBs[ii], i); 431 O << '\n'; 432 } 433 } 434} 435 436void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, 437 const MachineBasicBlock *MBB, 438 unsigned uid) const { 439 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 440 441 // Use JumpTableDirective otherwise honor the entry size from the jump table 442 // info. 443 const char *JTEntryDirective = TAI->getJumpTableDirective(); 444 bool HadJTEntryDirective = JTEntryDirective != NULL; 445 if (!HadJTEntryDirective) { 446 JTEntryDirective = MJTI->getEntrySize() == 4 ? 447 TAI->getData32bitsDirective() : TAI->getData64bitsDirective(); 448 } 449 450 O << JTEntryDirective << ' '; 451 452 // If we have emitted set directives for the jump table entries, print 453 // them rather than the entries themselves. If we're emitting PIC, then 454 // emit the table entries as differences between two text section labels. 455 // If we're emitting non-PIC code, then emit the entries as direct 456 // references to the target basic blocks. 457 if (IsPic) { 458 if (TAI->getSetDirective()) { 459 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber() 460 << '_' << uid << "_set_" << MBB->getNumber(); 461 } else { 462 printBasicBlockLabel(MBB, false, false, false); 463 // If the arch uses custom Jump Table directives, don't calc relative to 464 // JT 465 if (!HadJTEntryDirective) 466 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" 467 << getFunctionNumber() << '_' << uid; 468 } 469 } else { 470 printBasicBlockLabel(MBB, false, false, false); 471 } 472} 473 474 475/// EmitSpecialLLVMGlobal - Check to see if the specified global is a 476/// special global used by LLVM. If so, emit it and return true, otherwise 477/// do nothing and return false. 478bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) { 479 if (GV->isName("llvm.used")) { 480 if (TAI->getUsedDirective() != 0) // No need to emit this at all. 481 EmitLLVMUsedList(GV->getInitializer()); 482 return true; 483 } 484 485 // Ignore debug and non-emitted data. This handles llvm.compiler.used. 486 if (GV->getSection() == "llvm.metadata" || 487 GV->hasAvailableExternallyLinkage()) 488 return true; 489 490 if (!GV->hasAppendingLinkage()) return false; 491 492 assert(GV->hasInitializer() && "Not a special LLVM global!"); 493 494 const TargetData *TD = TM.getTargetData(); 495 unsigned Align = Log2_32(TD->getPointerPrefAlignment()); 496 if (GV->getName() == "llvm.global_ctors") { 497 SwitchToDataSection(TAI->getStaticCtorsSection()); 498 EmitAlignment(Align, 0); 499 EmitXXStructorList(GV->getInitializer()); 500 return true; 501 } 502 503 if (GV->getName() == "llvm.global_dtors") { 504 SwitchToDataSection(TAI->getStaticDtorsSection()); 505 EmitAlignment(Align, 0); 506 EmitXXStructorList(GV->getInitializer()); 507 return true; 508 } 509 510 return false; 511} 512 513/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each 514/// global in the specified llvm.used list for which emitUsedDirectiveFor 515/// is true, as being used with this directive. 516void AsmPrinter::EmitLLVMUsedList(Constant *List) { 517 const char *Directive = TAI->getUsedDirective(); 518 519 // Should be an array of 'i8*'. 520 ConstantArray *InitList = dyn_cast<ConstantArray>(List); 521 if (InitList == 0) return; 522 523 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) { 524 const GlobalValue *GV = 525 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts()); 526 if (GV && TAI->emitUsedDirectiveFor(GV, Mang)) { 527 O << Directive; 528 EmitConstantValueOnly(InitList->getOperand(i)); 529 O << '\n'; 530 } 531 } 532} 533 534/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the 535/// function pointers, ignoring the init priority. 536void AsmPrinter::EmitXXStructorList(Constant *List) { 537 // Should be an array of '{ int, void ()* }' structs. The first value is the 538 // init priority, which we ignore. 539 if (!isa<ConstantArray>(List)) return; 540 ConstantArray *InitList = cast<ConstantArray>(List); 541 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 542 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){ 543 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. 544 545 if (CS->getOperand(1)->isNullValue()) 546 return; // Found a null terminator, exit printing. 547 // Emit the function pointer. 548 EmitGlobalConstant(CS->getOperand(1)); 549 } 550} 551 552/// getGlobalLinkName - Returns the asm/link name of of the specified 553/// global variable. Should be overridden by each target asm printer to 554/// generate the appropriate value. 555const std::string &AsmPrinter::getGlobalLinkName(const GlobalVariable *GV, 556 std::string &LinkName) const { 557 if (isa<Function>(GV)) { 558 LinkName += TAI->getFunctionAddrPrefix(); 559 LinkName += Mang->getMangledName(GV); 560 LinkName += TAI->getFunctionAddrSuffix(); 561 } else { 562 LinkName += TAI->getGlobalVarAddrPrefix(); 563 LinkName += Mang->getMangledName(GV); 564 LinkName += TAI->getGlobalVarAddrSuffix(); 565 } 566 567 return LinkName; 568} 569 570/// EmitExternalGlobal - Emit the external reference to a global variable. 571/// Should be overridden if an indirect reference should be used. 572void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) { 573 std::string GLN; 574 O << getGlobalLinkName(GV, GLN); 575} 576 577 578 579//===----------------------------------------------------------------------===// 580/// LEB 128 number encoding. 581 582/// PrintULEB128 - Print a series of hexidecimal values (separated by commas) 583/// representing an unsigned leb128 value. 584void AsmPrinter::PrintULEB128(unsigned Value) const { 585 char Buffer[20]; 586 do { 587 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 588 Value >>= 7; 589 if (Value) Byte |= 0x80; 590 O << "0x" << utohex_buffer(Byte, Buffer+20); 591 if (Value) O << ", "; 592 } while (Value); 593} 594 595/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas) 596/// representing a signed leb128 value. 597void AsmPrinter::PrintSLEB128(int Value) const { 598 int Sign = Value >> (8 * sizeof(Value) - 1); 599 bool IsMore; 600 char Buffer[20]; 601 602 do { 603 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f); 604 Value >>= 7; 605 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; 606 if (IsMore) Byte |= 0x80; 607 O << "0x" << utohex_buffer(Byte, Buffer+20); 608 if (IsMore) O << ", "; 609 } while (IsMore); 610} 611 612//===--------------------------------------------------------------------===// 613// Emission and print routines 614// 615 616/// PrintHex - Print a value as a hexidecimal value. 617/// 618void AsmPrinter::PrintHex(int Value) const { 619 char Buffer[20]; 620 O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20); 621} 622 623/// EOL - Print a newline character to asm stream. If a comment is present 624/// then it will be printed first. Comments should not contain '\n'. 625void AsmPrinter::EOL() const { 626 O << '\n'; 627} 628 629void AsmPrinter::EOL(const std::string &Comment) const { 630 if (VerboseAsm && !Comment.empty()) { 631 O << '\t' 632 << TAI->getCommentString() 633 << ' ' 634 << Comment; 635 } 636 O << '\n'; 637} 638 639void AsmPrinter::EOL(const char* Comment) const { 640 if (VerboseAsm && *Comment) { 641 O << '\t' 642 << TAI->getCommentString() 643 << ' ' 644 << Comment; 645 } 646 O << '\n'; 647} 648 649/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an 650/// unsigned leb128 value. 651void AsmPrinter::EmitULEB128Bytes(unsigned Value) const { 652 if (TAI->hasLEB128()) { 653 O << "\t.uleb128\t" 654 << Value; 655 } else { 656 O << TAI->getData8bitsDirective(); 657 PrintULEB128(Value); 658 } 659} 660 661/// EmitSLEB128Bytes - print an assembler byte data directive to compose a 662/// signed leb128 value. 663void AsmPrinter::EmitSLEB128Bytes(int Value) const { 664 if (TAI->hasLEB128()) { 665 O << "\t.sleb128\t" 666 << Value; 667 } else { 668 O << TAI->getData8bitsDirective(); 669 PrintSLEB128(Value); 670 } 671} 672 673/// EmitInt8 - Emit a byte directive and value. 674/// 675void AsmPrinter::EmitInt8(int Value) const { 676 O << TAI->getData8bitsDirective(); 677 PrintHex(Value & 0xFF); 678} 679 680/// EmitInt16 - Emit a short directive and value. 681/// 682void AsmPrinter::EmitInt16(int Value) const { 683 O << TAI->getData16bitsDirective(); 684 PrintHex(Value & 0xFFFF); 685} 686 687/// EmitInt32 - Emit a long directive and value. 688/// 689void AsmPrinter::EmitInt32(int Value) const { 690 O << TAI->getData32bitsDirective(); 691 PrintHex(Value); 692} 693 694/// EmitInt64 - Emit a long long directive and value. 695/// 696void AsmPrinter::EmitInt64(uint64_t Value) const { 697 if (TAI->getData64bitsDirective()) { 698 O << TAI->getData64bitsDirective(); 699 PrintHex(Value); 700 } else { 701 if (TM.getTargetData()->isBigEndian()) { 702 EmitInt32(unsigned(Value >> 32)); O << '\n'; 703 EmitInt32(unsigned(Value)); 704 } else { 705 EmitInt32(unsigned(Value)); O << '\n'; 706 EmitInt32(unsigned(Value >> 32)); 707 } 708 } 709} 710 711/// toOctal - Convert the low order bits of X into an octal digit. 712/// 713static inline char toOctal(int X) { 714 return (X&7)+'0'; 715} 716 717/// printStringChar - Print a char, escaped if necessary. 718/// 719static void printStringChar(formatted_raw_ostream &O, unsigned char C) { 720 if (C == '"') { 721 O << "\\\""; 722 } else if (C == '\\') { 723 O << "\\\\"; 724 } else if (isprint((unsigned char)C)) { 725 O << C; 726 } else { 727 switch(C) { 728 case '\b': O << "\\b"; break; 729 case '\f': O << "\\f"; break; 730 case '\n': O << "\\n"; break; 731 case '\r': O << "\\r"; break; 732 case '\t': O << "\\t"; break; 733 default: 734 O << '\\'; 735 O << toOctal(C >> 6); 736 O << toOctal(C >> 3); 737 O << toOctal(C >> 0); 738 break; 739 } 740 } 741} 742 743/// EmitString - Emit a string with quotes and a null terminator. 744/// Special characters are emitted properly. 745/// \literal (Eg. '\t') \endliteral 746void AsmPrinter::EmitString(const std::string &String) const { 747 EmitString(String.c_str(), String.size()); 748} 749 750void AsmPrinter::EmitString(const char *String, unsigned Size) const { 751 const char* AscizDirective = TAI->getAscizDirective(); 752 if (AscizDirective) 753 O << AscizDirective; 754 else 755 O << TAI->getAsciiDirective(); 756 O << '\"'; 757 for (unsigned i = 0; i < Size; ++i) 758 printStringChar(O, String[i]); 759 if (AscizDirective) 760 O << '\"'; 761 else 762 O << "\\0\""; 763} 764 765 766/// EmitFile - Emit a .file directive. 767void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const { 768 O << "\t.file\t" << Number << " \""; 769 for (unsigned i = 0, N = Name.size(); i < N; ++i) 770 printStringChar(O, Name[i]); 771 O << '\"'; 772} 773 774 775//===----------------------------------------------------------------------===// 776 777// EmitAlignment - Emit an alignment directive to the specified power of 778// two boundary. For example, if you pass in 3 here, you will get an 8 779// byte alignment. If a global value is specified, and if that global has 780// an explicit alignment requested, it will unconditionally override the 781// alignment request. However, if ForcedAlignBits is specified, this value 782// has final say: the ultimate alignment will be the max of ForcedAlignBits 783// and the alignment computed with NumBits and the global. 784// 785// The algorithm is: 786// Align = NumBits; 787// if (GV && GV->hasalignment) Align = GV->getalignment(); 788// Align = std::max(Align, ForcedAlignBits); 789// 790void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV, 791 unsigned ForcedAlignBits, 792 bool UseFillExpr) const { 793 if (GV && GV->getAlignment()) 794 NumBits = Log2_32(GV->getAlignment()); 795 NumBits = std::max(NumBits, ForcedAlignBits); 796 797 if (NumBits == 0) return; // No need to emit alignment. 798 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits; 799 O << TAI->getAlignDirective() << NumBits; 800 801 unsigned FillValue = TAI->getTextAlignFillValue(); 802 UseFillExpr &= IsInTextSection && FillValue; 803 if (UseFillExpr) { 804 O << ','; 805 PrintHex(FillValue); 806 } 807 O << '\n'; 808} 809 810 811/// EmitZeros - Emit a block of zeros. 812/// 813void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const { 814 if (NumZeros) { 815 if (TAI->getZeroDirective()) { 816 O << TAI->getZeroDirective() << NumZeros; 817 if (TAI->getZeroDirectiveSuffix()) 818 O << TAI->getZeroDirectiveSuffix(); 819 O << '\n'; 820 } else { 821 for (; NumZeros; --NumZeros) 822 O << TAI->getData8bitsDirective(AddrSpace) << "0\n"; 823 } 824 } 825} 826 827// Print out the specified constant, without a storage class. Only the 828// constants valid in constant expressions can occur here. 829void AsmPrinter::EmitConstantValueOnly(const Constant *CV) { 830 if (CV->isNullValue() || isa<UndefValue>(CV)) 831 O << '0'; 832 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 833 O << CI->getZExtValue(); 834 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) { 835 // This is a constant address for a global variable or function. Use the 836 // name of the variable or function as the address value, possibly 837 // decorating it with GlobalVarAddrPrefix/Suffix or 838 // FunctionAddrPrefix/Suffix (these all default to "" ) 839 if (isa<Function>(GV)) { 840 O << TAI->getFunctionAddrPrefix() 841 << Mang->getMangledName(GV) 842 << TAI->getFunctionAddrSuffix(); 843 } else { 844 O << TAI->getGlobalVarAddrPrefix() 845 << Mang->getMangledName(GV) 846 << TAI->getGlobalVarAddrSuffix(); 847 } 848 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { 849 const TargetData *TD = TM.getTargetData(); 850 unsigned Opcode = CE->getOpcode(); 851 switch (Opcode) { 852 case Instruction::GetElementPtr: { 853 // generate a symbolic expression for the byte address 854 const Constant *ptrVal = CE->getOperand(0); 855 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end()); 856 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], 857 idxVec.size())) { 858 // Truncate/sext the offset to the pointer size. 859 if (TD->getPointerSizeInBits() != 64) { 860 int SExtAmount = 64-TD->getPointerSizeInBits(); 861 Offset = (Offset << SExtAmount) >> SExtAmount; 862 } 863 864 if (Offset) 865 O << '('; 866 EmitConstantValueOnly(ptrVal); 867 if (Offset > 0) 868 O << ") + " << Offset; 869 else if (Offset < 0) 870 O << ") - " << -Offset; 871 } else { 872 EmitConstantValueOnly(ptrVal); 873 } 874 break; 875 } 876 case Instruction::Trunc: 877 case Instruction::ZExt: 878 case Instruction::SExt: 879 case Instruction::FPTrunc: 880 case Instruction::FPExt: 881 case Instruction::UIToFP: 882 case Instruction::SIToFP: 883 case Instruction::FPToUI: 884 case Instruction::FPToSI: 885 llvm_unreachable("FIXME: Don't yet support this kind of constant cast expr"); 886 break; 887 case Instruction::BitCast: 888 return EmitConstantValueOnly(CE->getOperand(0)); 889 890 case Instruction::IntToPtr: { 891 // Handle casts to pointers by changing them into casts to the appropriate 892 // integer type. This promotes constant folding and simplifies this code. 893 Constant *Op = CE->getOperand(0); 894 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/); 895 return EmitConstantValueOnly(Op); 896 } 897 898 899 case Instruction::PtrToInt: { 900 // Support only foldable casts to/from pointers that can be eliminated by 901 // changing the pointer to the appropriately sized integer type. 902 Constant *Op = CE->getOperand(0); 903 const Type *Ty = CE->getType(); 904 905 // We can emit the pointer value into this slot if the slot is an 906 // integer slot greater or equal to the size of the pointer. 907 if (TD->getTypeAllocSize(Ty) >= TD->getTypeAllocSize(Op->getType())) 908 return EmitConstantValueOnly(Op); 909 910 O << "(("; 911 EmitConstantValueOnly(Op); 912 APInt ptrMask = APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Ty)); 913 914 SmallString<40> S; 915 ptrMask.toStringUnsigned(S); 916 O << ") & " << S.c_str() << ')'; 917 break; 918 } 919 case Instruction::Add: 920 case Instruction::Sub: 921 case Instruction::And: 922 case Instruction::Or: 923 case Instruction::Xor: 924 O << '('; 925 EmitConstantValueOnly(CE->getOperand(0)); 926 O << ')'; 927 switch (Opcode) { 928 case Instruction::Add: 929 O << " + "; 930 break; 931 case Instruction::Sub: 932 O << " - "; 933 break; 934 case Instruction::And: 935 O << " & "; 936 break; 937 case Instruction::Or: 938 O << " | "; 939 break; 940 case Instruction::Xor: 941 O << " ^ "; 942 break; 943 default: 944 break; 945 } 946 O << '('; 947 EmitConstantValueOnly(CE->getOperand(1)); 948 O << ')'; 949 break; 950 default: 951 llvm_unreachable("Unsupported operator!"); 952 } 953 } else { 954 llvm_unreachable("Unknown constant value!"); 955 } 956} 957 958/// printAsCString - Print the specified array as a C compatible string, only if 959/// the predicate isString is true. 960/// 961static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA, 962 unsigned LastElt) { 963 assert(CVA->isString() && "Array is not string compatible!"); 964 965 O << '\"'; 966 for (unsigned i = 0; i != LastElt; ++i) { 967 unsigned char C = 968 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue(); 969 printStringChar(O, C); 970 } 971 O << '\"'; 972} 973 974/// EmitString - Emit a zero-byte-terminated string constant. 975/// 976void AsmPrinter::EmitString(const ConstantArray *CVA) const { 977 unsigned NumElts = CVA->getNumOperands(); 978 if (TAI->getAscizDirective() && NumElts && 979 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) { 980 O << TAI->getAscizDirective(); 981 printAsCString(O, CVA, NumElts-1); 982 } else { 983 O << TAI->getAsciiDirective(); 984 printAsCString(O, CVA, NumElts); 985 } 986 O << '\n'; 987} 988 989void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA, 990 unsigned AddrSpace) { 991 if (CVA->isString()) { 992 EmitString(CVA); 993 } else { // Not a string. Print the values in successive locations 994 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) 995 EmitGlobalConstant(CVA->getOperand(i), AddrSpace); 996 } 997} 998 999void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) { 1000 const VectorType *PTy = CP->getType(); 1001 1002 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I) 1003 EmitGlobalConstant(CP->getOperand(I)); 1004} 1005 1006void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS, 1007 unsigned AddrSpace) { 1008 // Print the fields in successive locations. Pad to align if needed! 1009 const TargetData *TD = TM.getTargetData(); 1010 unsigned Size = TD->getTypeAllocSize(CVS->getType()); 1011 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType()); 1012 uint64_t sizeSoFar = 0; 1013 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) { 1014 const Constant* field = CVS->getOperand(i); 1015 1016 // Check if padding is needed and insert one or more 0s. 1017 uint64_t fieldSize = TD->getTypeAllocSize(field->getType()); 1018 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1)) 1019 - cvsLayout->getElementOffset(i)) - fieldSize; 1020 sizeSoFar += fieldSize + padSize; 1021 1022 // Now print the actual field value. 1023 EmitGlobalConstant(field, AddrSpace); 1024 1025 // Insert padding - this may include padding to increase the size of the 1026 // current field up to the ABI size (if the struct is not packed) as well 1027 // as padding to ensure that the next field starts at the right offset. 1028 EmitZeros(padSize, AddrSpace); 1029 } 1030 assert(sizeSoFar == cvsLayout->getSizeInBytes() && 1031 "Layout of constant struct may be incorrect!"); 1032} 1033 1034void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP, 1035 unsigned AddrSpace) { 1036 // FP Constants are printed as integer constants to avoid losing 1037 // precision... 1038 const TargetData *TD = TM.getTargetData(); 1039 if (CFP->getType() == Type::DoubleTy) { 1040 double Val = CFP->getValueAPF().convertToDouble(); // for comment only 1041 uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1042 if (TAI->getData64bitsDirective(AddrSpace)) { 1043 O << TAI->getData64bitsDirective(AddrSpace) << i; 1044 if (VerboseAsm) 1045 O << '\t' << TAI->getCommentString() << " double value: " << Val; 1046 O << '\n'; 1047 } else if (TD->isBigEndian()) { 1048 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32); 1049 if (VerboseAsm) 1050 O << '\t' << TAI->getCommentString() 1051 << " double most significant word " << Val; 1052 O << '\n'; 1053 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i); 1054 if (VerboseAsm) 1055 O << '\t' << TAI->getCommentString() 1056 << " double least significant word " << Val; 1057 O << '\n'; 1058 } else { 1059 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i); 1060 if (VerboseAsm) 1061 O << '\t' << TAI->getCommentString() 1062 << " double least significant word " << Val; 1063 O << '\n'; 1064 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32); 1065 if (VerboseAsm) 1066 O << '\t' << TAI->getCommentString() 1067 << " double most significant word " << Val; 1068 O << '\n'; 1069 } 1070 return; 1071 } else if (CFP->getType() == Type::FloatTy) { 1072 float Val = CFP->getValueAPF().convertToFloat(); // for comment only 1073 O << TAI->getData32bitsDirective(AddrSpace) 1074 << CFP->getValueAPF().bitcastToAPInt().getZExtValue(); 1075 if (VerboseAsm) 1076 O << '\t' << TAI->getCommentString() << " float " << Val; 1077 O << '\n'; 1078 return; 1079 } else if (CFP->getType() == Type::X86_FP80Ty) { 1080 // all long double variants are printed as hex 1081 // api needed to prevent premature destruction 1082 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1083 const uint64_t *p = api.getRawData(); 1084 // Convert to double so we can print the approximate val as a comment. 1085 APFloat DoubleVal = CFP->getValueAPF(); 1086 bool ignored; 1087 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, 1088 &ignored); 1089 if (TD->isBigEndian()) { 1090 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]); 1091 if (VerboseAsm) 1092 O << '\t' << TAI->getCommentString() 1093 << " long double most significant halfword of ~" 1094 << DoubleVal.convertToDouble(); 1095 O << '\n'; 1096 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48); 1097 if (VerboseAsm) 1098 O << '\t' << TAI->getCommentString() << " long double next halfword"; 1099 O << '\n'; 1100 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32); 1101 if (VerboseAsm) 1102 O << '\t' << TAI->getCommentString() << " long double next halfword"; 1103 O << '\n'; 1104 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16); 1105 if (VerboseAsm) 1106 O << '\t' << TAI->getCommentString() << " long double next halfword"; 1107 O << '\n'; 1108 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]); 1109 if (VerboseAsm) 1110 O << '\t' << TAI->getCommentString() 1111 << " long double least significant halfword"; 1112 O << '\n'; 1113 } else { 1114 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]); 1115 if (VerboseAsm) 1116 O << '\t' << TAI->getCommentString() 1117 << " long double least significant halfword of ~" 1118 << DoubleVal.convertToDouble(); 1119 O << '\n'; 1120 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16); 1121 if (VerboseAsm) 1122 O << '\t' << TAI->getCommentString() 1123 << " long double next halfword"; 1124 O << '\n'; 1125 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32); 1126 if (VerboseAsm) 1127 O << '\t' << TAI->getCommentString() 1128 << " long double next halfword"; 1129 O << '\n'; 1130 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48); 1131 if (VerboseAsm) 1132 O << '\t' << TAI->getCommentString() 1133 << " long double next halfword"; 1134 O << '\n'; 1135 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]); 1136 if (VerboseAsm) 1137 O << '\t' << TAI->getCommentString() 1138 << " long double most significant halfword"; 1139 O << '\n'; 1140 } 1141 EmitZeros(TD->getTypeAllocSize(Type::X86_FP80Ty) - 1142 TD->getTypeStoreSize(Type::X86_FP80Ty), AddrSpace); 1143 return; 1144 } else if (CFP->getType() == Type::PPC_FP128Ty) { 1145 // all long double variants are printed as hex 1146 // api needed to prevent premature destruction 1147 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1148 const uint64_t *p = api.getRawData(); 1149 if (TD->isBigEndian()) { 1150 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32); 1151 if (VerboseAsm) 1152 O << '\t' << TAI->getCommentString() 1153 << " long double most significant word"; 1154 O << '\n'; 1155 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]); 1156 if (VerboseAsm) 1157 O << '\t' << TAI->getCommentString() 1158 << " long double next word"; 1159 O << '\n'; 1160 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32); 1161 if (VerboseAsm) 1162 O << '\t' << TAI->getCommentString() 1163 << " long double next word"; 1164 O << '\n'; 1165 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]); 1166 if (VerboseAsm) 1167 O << '\t' << TAI->getCommentString() 1168 << " long double least significant word"; 1169 O << '\n'; 1170 } else { 1171 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]); 1172 if (VerboseAsm) 1173 O << '\t' << TAI->getCommentString() 1174 << " long double least significant word"; 1175 O << '\n'; 1176 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32); 1177 if (VerboseAsm) 1178 O << '\t' << TAI->getCommentString() 1179 << " long double next word"; 1180 O << '\n'; 1181 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]); 1182 if (VerboseAsm) 1183 O << '\t' << TAI->getCommentString() 1184 << " long double next word"; 1185 O << '\n'; 1186 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32); 1187 if (VerboseAsm) 1188 O << '\t' << TAI->getCommentString() 1189 << " long double most significant word"; 1190 O << '\n'; 1191 } 1192 return; 1193 } else llvm_unreachable("Floating point constant type not handled"); 1194} 1195 1196void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI, 1197 unsigned AddrSpace) { 1198 const TargetData *TD = TM.getTargetData(); 1199 unsigned BitWidth = CI->getBitWidth(); 1200 assert(isPowerOf2_32(BitWidth) && 1201 "Non-power-of-2-sized integers not handled!"); 1202 1203 // We don't expect assemblers to support integer data directives 1204 // for more than 64 bits, so we emit the data in at most 64-bit 1205 // quantities at a time. 1206 const uint64_t *RawData = CI->getValue().getRawData(); 1207 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) { 1208 uint64_t Val; 1209 if (TD->isBigEndian()) 1210 Val = RawData[e - i - 1]; 1211 else 1212 Val = RawData[i]; 1213 1214 if (TAI->getData64bitsDirective(AddrSpace)) 1215 O << TAI->getData64bitsDirective(AddrSpace) << Val << '\n'; 1216 else if (TD->isBigEndian()) { 1217 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32); 1218 if (VerboseAsm) 1219 O << '\t' << TAI->getCommentString() 1220 << " Double-word most significant word " << Val; 1221 O << '\n'; 1222 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val); 1223 if (VerboseAsm) 1224 O << '\t' << TAI->getCommentString() 1225 << " Double-word least significant word " << Val; 1226 O << '\n'; 1227 } else { 1228 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val); 1229 if (VerboseAsm) 1230 O << '\t' << TAI->getCommentString() 1231 << " Double-word least significant word " << Val; 1232 O << '\n'; 1233 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32); 1234 if (VerboseAsm) 1235 O << '\t' << TAI->getCommentString() 1236 << " Double-word most significant word " << Val; 1237 O << '\n'; 1238 } 1239 } 1240} 1241 1242/// EmitGlobalConstant - Print a general LLVM constant to the .s file. 1243void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) { 1244 const TargetData *TD = TM.getTargetData(); 1245 const Type *type = CV->getType(); 1246 unsigned Size = TD->getTypeAllocSize(type); 1247 1248 if (CV->isNullValue() || isa<UndefValue>(CV)) { 1249 EmitZeros(Size, AddrSpace); 1250 return; 1251 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) { 1252 EmitGlobalConstantArray(CVA , AddrSpace); 1253 return; 1254 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) { 1255 EmitGlobalConstantStruct(CVS, AddrSpace); 1256 return; 1257 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) { 1258 EmitGlobalConstantFP(CFP, AddrSpace); 1259 return; 1260 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1261 // Small integers are handled below; large integers are handled here. 1262 if (Size > 4) { 1263 EmitGlobalConstantLargeInt(CI, AddrSpace); 1264 return; 1265 } 1266 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) { 1267 EmitGlobalConstantVector(CP); 1268 return; 1269 } 1270 1271 printDataDirective(type, AddrSpace); 1272 EmitConstantValueOnly(CV); 1273 if (VerboseAsm) { 1274 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 1275 SmallString<40> S; 1276 CI->getValue().toStringUnsigned(S, 16); 1277 O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str(); 1278 } 1279 } 1280 O << '\n'; 1281} 1282 1283void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) { 1284 // Target doesn't support this yet! 1285 llvm_unreachable("Target does not support EmitMachineConstantPoolValue"); 1286} 1287 1288/// PrintSpecial - Print information related to the specified machine instr 1289/// that is independent of the operand, and may be independent of the instr 1290/// itself. This can be useful for portably encoding the comment character 1291/// or other bits of target-specific knowledge into the asmstrings. The 1292/// syntax used is ${:comment}. Targets can override this to add support 1293/// for their own strange codes. 1294void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const { 1295 if (!strcmp(Code, "private")) { 1296 O << TAI->getPrivateGlobalPrefix(); 1297 } else if (!strcmp(Code, "comment")) { 1298 if (VerboseAsm) 1299 O << TAI->getCommentString(); 1300 } else if (!strcmp(Code, "uid")) { 1301 // Comparing the address of MI isn't sufficient, because machineinstrs may 1302 // be allocated to the same address across functions. 1303 const Function *ThisF = MI->getParent()->getParent()->getFunction(); 1304 1305 // If this is a new LastFn instruction, bump the counter. 1306 if (LastMI != MI || LastFn != ThisF) { 1307 ++Counter; 1308 LastMI = MI; 1309 LastFn = ThisF; 1310 } 1311 O << Counter; 1312 } else { 1313 std::string msg; 1314 raw_string_ostream Msg(msg); 1315 Msg << "Unknown special formatter '" << Code 1316 << "' for machine instr: " << *MI; 1317 llvm_report_error(Msg.str()); 1318 } 1319} 1320 1321/// processDebugLoc - Processes the debug information of each machine 1322/// instruction's DebugLoc. 1323void AsmPrinter::processDebugLoc(DebugLoc DL) { 1324 if (TAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) { 1325 if (!DL.isUnknown()) { 1326 DebugLocTuple CurDLT = MF->getDebugLocTuple(DL); 1327 1328 if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT) 1329 printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col, 1330 DICompileUnit(CurDLT.CompileUnit))); 1331 1332 PrevDLT = CurDLT; 1333 } 1334 } 1335} 1336 1337/// printInlineAsm - This method formats and prints the specified machine 1338/// instruction that is an inline asm. 1339void AsmPrinter::printInlineAsm(const MachineInstr *MI) const { 1340 unsigned NumOperands = MI->getNumOperands(); 1341 1342 // Count the number of register definitions. 1343 unsigned NumDefs = 0; 1344 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef(); 1345 ++NumDefs) 1346 assert(NumDefs != NumOperands-1 && "No asm string?"); 1347 1348 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?"); 1349 1350 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc. 1351 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName(); 1352 1353 // If this asmstr is empty, just print the #APP/#NOAPP markers. 1354 // These are useful to see where empty asm's wound up. 1355 if (AsmStr[0] == 0) { 1356 O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n'; 1357 return; 1358 } 1359 1360 O << TAI->getInlineAsmStart() << "\n\t"; 1361 1362 // The variant of the current asmprinter. 1363 int AsmPrinterVariant = TAI->getAssemblerDialect(); 1364 1365 int CurVariant = -1; // The number of the {.|.|.} region we are in. 1366 const char *LastEmitted = AsmStr; // One past the last character emitted. 1367 1368 while (*LastEmitted) { 1369 switch (*LastEmitted) { 1370 default: { 1371 // Not a special case, emit the string section literally. 1372 const char *LiteralEnd = LastEmitted+1; 1373 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' && 1374 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n') 1375 ++LiteralEnd; 1376 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1377 O.write(LastEmitted, LiteralEnd-LastEmitted); 1378 LastEmitted = LiteralEnd; 1379 break; 1380 } 1381 case '\n': 1382 ++LastEmitted; // Consume newline character. 1383 O << '\n'; // Indent code with newline. 1384 break; 1385 case '$': { 1386 ++LastEmitted; // Consume '$' character. 1387 bool Done = true; 1388 1389 // Handle escapes. 1390 switch (*LastEmitted) { 1391 default: Done = false; break; 1392 case '$': // $$ -> $ 1393 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) 1394 O << '$'; 1395 ++LastEmitted; // Consume second '$' character. 1396 break; 1397 case '(': // $( -> same as GCC's { character. 1398 ++LastEmitted; // Consume '(' character. 1399 if (CurVariant != -1) { 1400 llvm_report_error("Nested variants found in inline asm string: '" 1401 + std::string(AsmStr) + "'"); 1402 } 1403 CurVariant = 0; // We're in the first variant now. 1404 break; 1405 case '|': 1406 ++LastEmitted; // consume '|' character. 1407 if (CurVariant == -1) 1408 O << '|'; // this is gcc's behavior for | outside a variant 1409 else 1410 ++CurVariant; // We're in the next variant. 1411 break; 1412 case ')': // $) -> same as GCC's } char. 1413 ++LastEmitted; // consume ')' character. 1414 if (CurVariant == -1) 1415 O << '}'; // this is gcc's behavior for } outside a variant 1416 else 1417 CurVariant = -1; 1418 break; 1419 } 1420 if (Done) break; 1421 1422 bool HasCurlyBraces = false; 1423 if (*LastEmitted == '{') { // ${variable} 1424 ++LastEmitted; // Consume '{' character. 1425 HasCurlyBraces = true; 1426 } 1427 1428 // If we have ${:foo}, then this is not a real operand reference, it is a 1429 // "magic" string reference, just like in .td files. Arrange to call 1430 // PrintSpecial. 1431 if (HasCurlyBraces && *LastEmitted == ':') { 1432 ++LastEmitted; 1433 const char *StrStart = LastEmitted; 1434 const char *StrEnd = strchr(StrStart, '}'); 1435 if (StrEnd == 0) { 1436 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '" 1437 + std::string(AsmStr) + "'"); 1438 } 1439 1440 std::string Val(StrStart, StrEnd); 1441 PrintSpecial(MI, Val.c_str()); 1442 LastEmitted = StrEnd+1; 1443 break; 1444 } 1445 1446 const char *IDStart = LastEmitted; 1447 char *IDEnd; 1448 errno = 0; 1449 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs. 1450 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) { 1451 llvm_report_error("Bad $ operand number in inline asm string: '" 1452 + std::string(AsmStr) + "'"); 1453 } 1454 LastEmitted = IDEnd; 1455 1456 char Modifier[2] = { 0, 0 }; 1457 1458 if (HasCurlyBraces) { 1459 // If we have curly braces, check for a modifier character. This 1460 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm. 1461 if (*LastEmitted == ':') { 1462 ++LastEmitted; // Consume ':' character. 1463 if (*LastEmitted == 0) { 1464 llvm_report_error("Bad ${:} expression in inline asm string: '" 1465 + std::string(AsmStr) + "'"); 1466 } 1467 1468 Modifier[0] = *LastEmitted; 1469 ++LastEmitted; // Consume modifier character. 1470 } 1471 1472 if (*LastEmitted != '}') { 1473 llvm_report_error("Bad ${} expression in inline asm string: '" 1474 + std::string(AsmStr) + "'"); 1475 } 1476 ++LastEmitted; // Consume '}' character. 1477 } 1478 1479 if ((unsigned)Val >= NumOperands-1) { 1480 llvm_report_error("Invalid $ operand number in inline asm string: '" 1481 + std::string(AsmStr) + "'"); 1482 } 1483 1484 // Okay, we finally have a value number. Ask the target to print this 1485 // operand! 1486 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) { 1487 unsigned OpNo = 1; 1488 1489 bool Error = false; 1490 1491 // Scan to find the machine operand number for the operand. 1492 for (; Val; --Val) { 1493 if (OpNo >= MI->getNumOperands()) break; 1494 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1495 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1; 1496 } 1497 1498 if (OpNo >= MI->getNumOperands()) { 1499 Error = true; 1500 } else { 1501 unsigned OpFlags = MI->getOperand(OpNo).getImm(); 1502 ++OpNo; // Skip over the ID number. 1503 1504 if (Modifier[0]=='l') // labels are target independent 1505 printBasicBlockLabel(MI->getOperand(OpNo).getMBB(), 1506 false, false, false); 1507 else { 1508 AsmPrinter *AP = const_cast<AsmPrinter*>(this); 1509 if ((OpFlags & 7) == 4) { 1510 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant, 1511 Modifier[0] ? Modifier : 0); 1512 } else { 1513 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant, 1514 Modifier[0] ? Modifier : 0); 1515 } 1516 } 1517 } 1518 if (Error) { 1519 std::string msg; 1520 raw_string_ostream Msg(msg); 1521 Msg << "Invalid operand found in inline asm: '" 1522 << AsmStr << "'\n"; 1523 MI->print(Msg); 1524 llvm_report_error(Msg.str()); 1525 } 1526 } 1527 break; 1528 } 1529 } 1530 } 1531 O << "\n\t" << TAI->getInlineAsmEnd() << '\n'; 1532} 1533 1534/// printImplicitDef - This method prints the specified machine instruction 1535/// that is an implicit def. 1536void AsmPrinter::printImplicitDef(const MachineInstr *MI) const { 1537 if (VerboseAsm) 1538 O << '\t' << TAI->getCommentString() << " implicit-def: " 1539 << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n'; 1540} 1541 1542/// printLabel - This method prints a local label used by debug and 1543/// exception handling tables. 1544void AsmPrinter::printLabel(const MachineInstr *MI) const { 1545 printLabel(MI->getOperand(0).getImm()); 1546} 1547 1548void AsmPrinter::printLabel(unsigned Id) const { 1549 O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n"; 1550} 1551 1552/// printDeclare - This method prints a local variable declaration used by 1553/// debug tables. 1554/// FIXME: It doesn't really print anything rather it inserts a DebugVariable 1555/// entry into dwarf table. 1556void AsmPrinter::printDeclare(const MachineInstr *MI) const { 1557 unsigned FI = MI->getOperand(0).getIndex(); 1558 GlobalValue *GV = MI->getOperand(1).getGlobal(); 1559 DW->RecordVariable(cast<GlobalVariable>(GV), FI, MI); 1560} 1561 1562/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM 1563/// instruction, using the specified assembler variant. Targets should 1564/// overried this to format as appropriate. 1565bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 1566 unsigned AsmVariant, const char *ExtraCode) { 1567 // Target doesn't support this yet! 1568 return true; 1569} 1570 1571bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 1572 unsigned AsmVariant, 1573 const char *ExtraCode) { 1574 // Target doesn't support this yet! 1575 return true; 1576} 1577 1578/// printBasicBlockLabel - This method prints the label for the specified 1579/// MachineBasicBlock 1580void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB, 1581 bool printAlign, 1582 bool printColon, 1583 bool printComment) const { 1584 if (printAlign) { 1585 unsigned Align = MBB->getAlignment(); 1586 if (Align) 1587 EmitAlignment(Log2_32(Align)); 1588 } 1589 1590 O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_' 1591 << MBB->getNumber(); 1592 if (printColon) 1593 O << ':'; 1594 if (printComment && MBB->getBasicBlock()) 1595 O << '\t' << TAI->getCommentString() << ' ' 1596 << MBB->getBasicBlock()->getNameStart(); 1597} 1598 1599/// printPICJumpTableSetLabel - This method prints a set label for the 1600/// specified MachineBasicBlock for a jumptable entry. 1601void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, 1602 const MachineBasicBlock *MBB) const { 1603 if (!TAI->getSetDirective()) 1604 return; 1605 1606 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix() 1607 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','; 1608 printBasicBlockLabel(MBB, false, false, false); 1609 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1610 << '_' << uid << '\n'; 1611} 1612 1613void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2, 1614 const MachineBasicBlock *MBB) const { 1615 if (!TAI->getSetDirective()) 1616 return; 1617 1618 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix() 1619 << getFunctionNumber() << '_' << uid << '_' << uid2 1620 << "_set_" << MBB->getNumber() << ','; 1621 printBasicBlockLabel(MBB, false, false, false); 1622 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 1623 << '_' << uid << '_' << uid2 << '\n'; 1624} 1625 1626/// printDataDirective - This method prints the asm directive for the 1627/// specified type. 1628void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) { 1629 const TargetData *TD = TM.getTargetData(); 1630 switch (type->getTypeID()) { 1631 case Type::FloatTyID: case Type::DoubleTyID: 1632 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID: 1633 assert(0 && "Should have already output floating point constant."); 1634 default: 1635 assert(0 && "Can't handle printing this type of thing"); 1636 case Type::IntegerTyID: { 1637 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth(); 1638 if (BitWidth <= 8) 1639 O << TAI->getData8bitsDirective(AddrSpace); 1640 else if (BitWidth <= 16) 1641 O << TAI->getData16bitsDirective(AddrSpace); 1642 else if (BitWidth <= 32) 1643 O << TAI->getData32bitsDirective(AddrSpace); 1644 else if (BitWidth <= 64) { 1645 assert(TAI->getData64bitsDirective(AddrSpace) && 1646 "Target cannot handle 64-bit constant exprs!"); 1647 O << TAI->getData64bitsDirective(AddrSpace); 1648 } else { 1649 llvm_unreachable("Target cannot handle given data directive width!"); 1650 } 1651 break; 1652 } 1653 case Type::PointerTyID: 1654 if (TD->getPointerSize() == 8) { 1655 assert(TAI->getData64bitsDirective(AddrSpace) && 1656 "Target cannot handle 64-bit pointer exprs!"); 1657 O << TAI->getData64bitsDirective(AddrSpace); 1658 } else if (TD->getPointerSize() == 2) { 1659 O << TAI->getData16bitsDirective(AddrSpace); 1660 } else if (TD->getPointerSize() == 1) { 1661 O << TAI->getData8bitsDirective(AddrSpace); 1662 } else { 1663 O << TAI->getData32bitsDirective(AddrSpace); 1664 } 1665 break; 1666 } 1667} 1668 1669void AsmPrinter::printVisibility(const std::string& Name, 1670 unsigned Visibility) const { 1671 if (Visibility == GlobalValue::HiddenVisibility) { 1672 if (const char *Directive = TAI->getHiddenDirective()) 1673 O << Directive << Name << '\n'; 1674 } else if (Visibility == GlobalValue::ProtectedVisibility) { 1675 if (const char *Directive = TAI->getProtectedDirective()) 1676 O << Directive << Name << '\n'; 1677 } 1678} 1679 1680void AsmPrinter::printOffset(int64_t Offset) const { 1681 if (Offset > 0) 1682 O << '+' << Offset; 1683 else if (Offset < 0) 1684 O << Offset; 1685} 1686 1687GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) { 1688 if (!S->usesMetadata()) 1689 return 0; 1690 1691 gcp_iterator GCPI = GCMetadataPrinters.find(S); 1692 if (GCPI != GCMetadataPrinters.end()) 1693 return GCPI->second; 1694 1695 const char *Name = S->getName().c_str(); 1696 1697 for (GCMetadataPrinterRegistry::iterator 1698 I = GCMetadataPrinterRegistry::begin(), 1699 E = GCMetadataPrinterRegistry::end(); I != E; ++I) 1700 if (strcmp(Name, I->getName()) == 0) { 1701 GCMetadataPrinter *GMP = I->instantiate(); 1702 GMP->S = S; 1703 GCMetadataPrinters.insert(std::make_pair(S, GMP)); 1704 return GMP; 1705 } 1706 1707 cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n"; 1708 llvm_unreachable(0); 1709} 1710 1711/// EmitComments - Pretty-print comments for instructions 1712void AsmPrinter::EmitComments(const MachineInstr &MI) const 1713{ 1714 if (VerboseAsm) { 1715 if (!MI.getDebugLoc().isUnknown()) { 1716 DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc()); 1717 1718 // Print source line info 1719 O.PadToColumn(TAI->getCommentColumn(), 1); 1720 O << TAI->getCommentString() << " SrcLine "; 1721 if (DLT.CompileUnit->hasInitializer()) { 1722 Constant *Name = DLT.CompileUnit->getInitializer(); 1723 if (ConstantArray *NameString = dyn_cast<ConstantArray>(Name)) 1724 if (NameString->isString()) { 1725 O << NameString->getAsString() << " "; 1726 } 1727 } 1728 O << DLT.Line; 1729 if (DLT.Col != 0) 1730 O << ":" << DLT.Col; 1731 } 1732 } 1733} 1734 1735/// EmitComments - Pretty-print comments for instructions 1736void AsmPrinter::EmitComments(const MCInst &MI) const 1737{ 1738 if (VerboseAsm) { 1739 if (!MI.getDebugLoc().isUnknown()) { 1740 DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc()); 1741 1742 // Print source line info 1743 O.PadToColumn(TAI->getCommentColumn(), 1); 1744 O << TAI->getCommentString() << " SrcLine "; 1745 if (DLT.CompileUnit->hasInitializer()) { 1746 Constant *Name = DLT.CompileUnit->getInitializer(); 1747 if (ConstantArray *NameString = dyn_cast<ConstantArray>(Name)) 1748 if (NameString->isString()) { 1749 O << NameString->getAsString() << " "; 1750 } 1751 } 1752 O << DLT.Line; 1753 if (DLT.Col != 0) 1754 O << ":" << DLT.Col; 1755 } 1756 } 1757} 1758