1 //===--- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ----------------===// 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 // Bitcode writer implementation. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Bitcode/ReaderWriter.h" 15 #include "ValueEnumerator.h" 16 #include "llvm/ADT/Triple.h" 17 #include "llvm/Bitcode/BitstreamWriter.h" 18 #include "llvm/Bitcode/LLVMBitCodes.h" 19 #include "llvm/IR/Constants.h" 20 #include "llvm/IR/DebugInfoMetadata.h" 21 #include "llvm/IR/DerivedTypes.h" 22 #include "llvm/IR/InlineAsm.h" 23 #include "llvm/IR/Instructions.h" 24 #include "llvm/IR/Module.h" 25 #include "llvm/IR/Operator.h" 26 #include "llvm/IR/UseListOrder.h" 27 #include "llvm/IR/ValueSymbolTable.h" 28 #include "llvm/Support/CommandLine.h" 29 #include "llvm/Support/ErrorHandling.h" 30 #include "llvm/Support/MathExtras.h" 31 #include "llvm/Support/Program.h" 32 #include "llvm/Support/raw_ostream.h" 33 #include <cctype> 34 #include <map> 35 using namespace llvm; 36 37 /// These are manifest constants used by the bitcode writer. They do not need to 38 /// be kept in sync with the reader, but need to be consistent within this file. 39 enum { 40 // VALUE_SYMTAB_BLOCK abbrev id's. 41 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 42 VST_ENTRY_7_ABBREV, 43 VST_ENTRY_6_ABBREV, 44 VST_BBENTRY_6_ABBREV, 45 46 // CONSTANTS_BLOCK abbrev id's. 47 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 48 CONSTANTS_INTEGER_ABBREV, 49 CONSTANTS_CE_CAST_Abbrev, 50 CONSTANTS_NULL_Abbrev, 51 52 // FUNCTION_BLOCK abbrev id's. 53 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 54 FUNCTION_INST_BINOP_ABBREV, 55 FUNCTION_INST_BINOP_FLAGS_ABBREV, 56 FUNCTION_INST_CAST_ABBREV, 57 FUNCTION_INST_RET_VOID_ABBREV, 58 FUNCTION_INST_RET_VAL_ABBREV, 59 FUNCTION_INST_UNREACHABLE_ABBREV 60 }; 61 62 static unsigned GetEncodedCastOpcode(unsigned Opcode) { 63 switch (Opcode) { 64 default: llvm_unreachable("Unknown cast instruction!"); 65 case Instruction::Trunc : return bitc::CAST_TRUNC; 66 case Instruction::ZExt : return bitc::CAST_ZEXT; 67 case Instruction::SExt : return bitc::CAST_SEXT; 68 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 69 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 70 case Instruction::UIToFP : return bitc::CAST_UITOFP; 71 case Instruction::SIToFP : return bitc::CAST_SITOFP; 72 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 73 case Instruction::FPExt : return bitc::CAST_FPEXT; 74 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 75 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 76 case Instruction::BitCast : return bitc::CAST_BITCAST; 77 case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST; 78 } 79 } 80 81 static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 82 switch (Opcode) { 83 default: llvm_unreachable("Unknown binary instruction!"); 84 case Instruction::Add: 85 case Instruction::FAdd: return bitc::BINOP_ADD; 86 case Instruction::Sub: 87 case Instruction::FSub: return bitc::BINOP_SUB; 88 case Instruction::Mul: 89 case Instruction::FMul: return bitc::BINOP_MUL; 90 case Instruction::UDiv: return bitc::BINOP_UDIV; 91 case Instruction::FDiv: 92 case Instruction::SDiv: return bitc::BINOP_SDIV; 93 case Instruction::URem: return bitc::BINOP_UREM; 94 case Instruction::FRem: 95 case Instruction::SRem: return bitc::BINOP_SREM; 96 case Instruction::Shl: return bitc::BINOP_SHL; 97 case Instruction::LShr: return bitc::BINOP_LSHR; 98 case Instruction::AShr: return bitc::BINOP_ASHR; 99 case Instruction::And: return bitc::BINOP_AND; 100 case Instruction::Or: return bitc::BINOP_OR; 101 case Instruction::Xor: return bitc::BINOP_XOR; 102 } 103 } 104 105 static unsigned GetEncodedRMWOperation(AtomicRMWInst::BinOp Op) { 106 switch (Op) { 107 default: llvm_unreachable("Unknown RMW operation!"); 108 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG; 109 case AtomicRMWInst::Add: return bitc::RMW_ADD; 110 case AtomicRMWInst::Sub: return bitc::RMW_SUB; 111 case AtomicRMWInst::And: return bitc::RMW_AND; 112 case AtomicRMWInst::Nand: return bitc::RMW_NAND; 113 case AtomicRMWInst::Or: return bitc::RMW_OR; 114 case AtomicRMWInst::Xor: return bitc::RMW_XOR; 115 case AtomicRMWInst::Max: return bitc::RMW_MAX; 116 case AtomicRMWInst::Min: return bitc::RMW_MIN; 117 case AtomicRMWInst::UMax: return bitc::RMW_UMAX; 118 case AtomicRMWInst::UMin: return bitc::RMW_UMIN; 119 } 120 } 121 122 static unsigned GetEncodedOrdering(AtomicOrdering Ordering) { 123 switch (Ordering) { 124 case NotAtomic: return bitc::ORDERING_NOTATOMIC; 125 case Unordered: return bitc::ORDERING_UNORDERED; 126 case Monotonic: return bitc::ORDERING_MONOTONIC; 127 case Acquire: return bitc::ORDERING_ACQUIRE; 128 case Release: return bitc::ORDERING_RELEASE; 129 case AcquireRelease: return bitc::ORDERING_ACQREL; 130 case SequentiallyConsistent: return bitc::ORDERING_SEQCST; 131 } 132 llvm_unreachable("Invalid ordering"); 133 } 134 135 static unsigned GetEncodedSynchScope(SynchronizationScope SynchScope) { 136 switch (SynchScope) { 137 case SingleThread: return bitc::SYNCHSCOPE_SINGLETHREAD; 138 case CrossThread: return bitc::SYNCHSCOPE_CROSSTHREAD; 139 } 140 llvm_unreachable("Invalid synch scope"); 141 } 142 143 static void WriteStringRecord(unsigned Code, StringRef Str, 144 unsigned AbbrevToUse, BitstreamWriter &Stream) { 145 SmallVector<unsigned, 64> Vals; 146 147 // Code: [strchar x N] 148 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 149 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i])) 150 AbbrevToUse = 0; 151 Vals.push_back(Str[i]); 152 } 153 154 // Emit the finished record. 155 Stream.EmitRecord(Code, Vals, AbbrevToUse); 156 } 157 158 static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) { 159 switch (Kind) { 160 case Attribute::Alignment: 161 return bitc::ATTR_KIND_ALIGNMENT; 162 case Attribute::AlwaysInline: 163 return bitc::ATTR_KIND_ALWAYS_INLINE; 164 case Attribute::Builtin: 165 return bitc::ATTR_KIND_BUILTIN; 166 case Attribute::ByVal: 167 return bitc::ATTR_KIND_BY_VAL; 168 case Attribute::InAlloca: 169 return bitc::ATTR_KIND_IN_ALLOCA; 170 case Attribute::Cold: 171 return bitc::ATTR_KIND_COLD; 172 case Attribute::InlineHint: 173 return bitc::ATTR_KIND_INLINE_HINT; 174 case Attribute::InReg: 175 return bitc::ATTR_KIND_IN_REG; 176 case Attribute::JumpTable: 177 return bitc::ATTR_KIND_JUMP_TABLE; 178 case Attribute::MinSize: 179 return bitc::ATTR_KIND_MIN_SIZE; 180 case Attribute::Naked: 181 return bitc::ATTR_KIND_NAKED; 182 case Attribute::Nest: 183 return bitc::ATTR_KIND_NEST; 184 case Attribute::NoAlias: 185 return bitc::ATTR_KIND_NO_ALIAS; 186 case Attribute::NoBuiltin: 187 return bitc::ATTR_KIND_NO_BUILTIN; 188 case Attribute::NoCapture: 189 return bitc::ATTR_KIND_NO_CAPTURE; 190 case Attribute::NoDuplicate: 191 return bitc::ATTR_KIND_NO_DUPLICATE; 192 case Attribute::NoImplicitFloat: 193 return bitc::ATTR_KIND_NO_IMPLICIT_FLOAT; 194 case Attribute::NoInline: 195 return bitc::ATTR_KIND_NO_INLINE; 196 case Attribute::NonLazyBind: 197 return bitc::ATTR_KIND_NON_LAZY_BIND; 198 case Attribute::NonNull: 199 return bitc::ATTR_KIND_NON_NULL; 200 case Attribute::Dereferenceable: 201 return bitc::ATTR_KIND_DEREFERENCEABLE; 202 case Attribute::NoRedZone: 203 return bitc::ATTR_KIND_NO_RED_ZONE; 204 case Attribute::NoReturn: 205 return bitc::ATTR_KIND_NO_RETURN; 206 case Attribute::NoUnwind: 207 return bitc::ATTR_KIND_NO_UNWIND; 208 case Attribute::OptimizeForSize: 209 return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE; 210 case Attribute::OptimizeNone: 211 return bitc::ATTR_KIND_OPTIMIZE_NONE; 212 case Attribute::ReadNone: 213 return bitc::ATTR_KIND_READ_NONE; 214 case Attribute::ReadOnly: 215 return bitc::ATTR_KIND_READ_ONLY; 216 case Attribute::Returned: 217 return bitc::ATTR_KIND_RETURNED; 218 case Attribute::ReturnsTwice: 219 return bitc::ATTR_KIND_RETURNS_TWICE; 220 case Attribute::SExt: 221 return bitc::ATTR_KIND_S_EXT; 222 case Attribute::StackAlignment: 223 return bitc::ATTR_KIND_STACK_ALIGNMENT; 224 case Attribute::StackProtect: 225 return bitc::ATTR_KIND_STACK_PROTECT; 226 case Attribute::StackProtectReq: 227 return bitc::ATTR_KIND_STACK_PROTECT_REQ; 228 case Attribute::StackProtectStrong: 229 return bitc::ATTR_KIND_STACK_PROTECT_STRONG; 230 case Attribute::StructRet: 231 return bitc::ATTR_KIND_STRUCT_RET; 232 case Attribute::SanitizeAddress: 233 return bitc::ATTR_KIND_SANITIZE_ADDRESS; 234 case Attribute::SanitizeThread: 235 return bitc::ATTR_KIND_SANITIZE_THREAD; 236 case Attribute::SanitizeMemory: 237 return bitc::ATTR_KIND_SANITIZE_MEMORY; 238 case Attribute::UWTable: 239 return bitc::ATTR_KIND_UW_TABLE; 240 case Attribute::ZExt: 241 return bitc::ATTR_KIND_Z_EXT; 242 case Attribute::EndAttrKinds: 243 llvm_unreachable("Can not encode end-attribute kinds marker."); 244 case Attribute::None: 245 llvm_unreachable("Can not encode none-attribute."); 246 } 247 248 llvm_unreachable("Trying to encode unknown attribute"); 249 } 250 251 static void WriteAttributeGroupTable(const ValueEnumerator &VE, 252 BitstreamWriter &Stream) { 253 const std::vector<AttributeSet> &AttrGrps = VE.getAttributeGroups(); 254 if (AttrGrps.empty()) return; 255 256 Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3); 257 258 SmallVector<uint64_t, 64> Record; 259 for (unsigned i = 0, e = AttrGrps.size(); i != e; ++i) { 260 AttributeSet AS = AttrGrps[i]; 261 for (unsigned i = 0, e = AS.getNumSlots(); i != e; ++i) { 262 AttributeSet A = AS.getSlotAttributes(i); 263 264 Record.push_back(VE.getAttributeGroupID(A)); 265 Record.push_back(AS.getSlotIndex(i)); 266 267 for (AttributeSet::iterator I = AS.begin(0), E = AS.end(0); 268 I != E; ++I) { 269 Attribute Attr = *I; 270 if (Attr.isEnumAttribute()) { 271 Record.push_back(0); 272 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum())); 273 } else if (Attr.isIntAttribute()) { 274 Record.push_back(1); 275 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum())); 276 Record.push_back(Attr.getValueAsInt()); 277 } else { 278 StringRef Kind = Attr.getKindAsString(); 279 StringRef Val = Attr.getValueAsString(); 280 281 Record.push_back(Val.empty() ? 3 : 4); 282 Record.append(Kind.begin(), Kind.end()); 283 Record.push_back(0); 284 if (!Val.empty()) { 285 Record.append(Val.begin(), Val.end()); 286 Record.push_back(0); 287 } 288 } 289 } 290 291 Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record); 292 Record.clear(); 293 } 294 } 295 296 Stream.ExitBlock(); 297 } 298 299 static void WriteAttributeTable(const ValueEnumerator &VE, 300 BitstreamWriter &Stream) { 301 const std::vector<AttributeSet> &Attrs = VE.getAttributes(); 302 if (Attrs.empty()) return; 303 304 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 305 306 SmallVector<uint64_t, 64> Record; 307 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 308 const AttributeSet &A = Attrs[i]; 309 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) 310 Record.push_back(VE.getAttributeGroupID(A.getSlotAttributes(i))); 311 312 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 313 Record.clear(); 314 } 315 316 Stream.ExitBlock(); 317 } 318 319 /// WriteTypeTable - Write out the type table for a module. 320 static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) { 321 const ValueEnumerator::TypeList &TypeList = VE.getTypes(); 322 323 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */); 324 SmallVector<uint64_t, 64> TypeVals; 325 326 uint64_t NumBits = Log2_32_Ceil(VE.getTypes().size()+1); 327 328 // Abbrev for TYPE_CODE_POINTER. 329 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 330 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 331 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 332 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 333 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 334 335 // Abbrev for TYPE_CODE_FUNCTION. 336 Abbv = new BitCodeAbbrev(); 337 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION)); 338 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 339 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 340 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 341 342 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 343 344 // Abbrev for TYPE_CODE_STRUCT_ANON. 345 Abbv = new BitCodeAbbrev(); 346 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON)); 347 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 348 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 349 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 350 351 unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv); 352 353 // Abbrev for TYPE_CODE_STRUCT_NAME. 354 Abbv = new BitCodeAbbrev(); 355 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME)); 356 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 357 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 358 unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv); 359 360 // Abbrev for TYPE_CODE_STRUCT_NAMED. 361 Abbv = new BitCodeAbbrev(); 362 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED)); 363 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 364 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 365 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 366 367 unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv); 368 369 // Abbrev for TYPE_CODE_ARRAY. 370 Abbv = new BitCodeAbbrev(); 371 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 372 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 373 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 374 375 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 376 377 // Emit an entry count so the reader can reserve space. 378 TypeVals.push_back(TypeList.size()); 379 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 380 TypeVals.clear(); 381 382 // Loop over all of the types, emitting each in turn. 383 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 384 Type *T = TypeList[i]; 385 int AbbrevToUse = 0; 386 unsigned Code = 0; 387 388 switch (T->getTypeID()) { 389 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 390 case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; break; 391 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 392 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 393 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 394 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 395 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 396 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 397 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 398 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break; 399 case Type::IntegerTyID: 400 // INTEGER: [width] 401 Code = bitc::TYPE_CODE_INTEGER; 402 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 403 break; 404 case Type::PointerTyID: { 405 PointerType *PTy = cast<PointerType>(T); 406 // POINTER: [pointee type, address space] 407 Code = bitc::TYPE_CODE_POINTER; 408 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 409 unsigned AddressSpace = PTy->getAddressSpace(); 410 TypeVals.push_back(AddressSpace); 411 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 412 break; 413 } 414 case Type::FunctionTyID: { 415 FunctionType *FT = cast<FunctionType>(T); 416 // FUNCTION: [isvararg, retty, paramty x N] 417 Code = bitc::TYPE_CODE_FUNCTION; 418 TypeVals.push_back(FT->isVarArg()); 419 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 420 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 421 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 422 AbbrevToUse = FunctionAbbrev; 423 break; 424 } 425 case Type::StructTyID: { 426 StructType *ST = cast<StructType>(T); 427 // STRUCT: [ispacked, eltty x N] 428 TypeVals.push_back(ST->isPacked()); 429 // Output all of the element types. 430 for (StructType::element_iterator I = ST->element_begin(), 431 E = ST->element_end(); I != E; ++I) 432 TypeVals.push_back(VE.getTypeID(*I)); 433 434 if (ST->isLiteral()) { 435 Code = bitc::TYPE_CODE_STRUCT_ANON; 436 AbbrevToUse = StructAnonAbbrev; 437 } else { 438 if (ST->isOpaque()) { 439 Code = bitc::TYPE_CODE_OPAQUE; 440 } else { 441 Code = bitc::TYPE_CODE_STRUCT_NAMED; 442 AbbrevToUse = StructNamedAbbrev; 443 } 444 445 // Emit the name if it is present. 446 if (!ST->getName().empty()) 447 WriteStringRecord(bitc::TYPE_CODE_STRUCT_NAME, ST->getName(), 448 StructNameAbbrev, Stream); 449 } 450 break; 451 } 452 case Type::ArrayTyID: { 453 ArrayType *AT = cast<ArrayType>(T); 454 // ARRAY: [numelts, eltty] 455 Code = bitc::TYPE_CODE_ARRAY; 456 TypeVals.push_back(AT->getNumElements()); 457 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 458 AbbrevToUse = ArrayAbbrev; 459 break; 460 } 461 case Type::VectorTyID: { 462 VectorType *VT = cast<VectorType>(T); 463 // VECTOR [numelts, eltty] 464 Code = bitc::TYPE_CODE_VECTOR; 465 TypeVals.push_back(VT->getNumElements()); 466 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 467 break; 468 } 469 } 470 471 // Emit the finished record. 472 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 473 TypeVals.clear(); 474 } 475 476 Stream.ExitBlock(); 477 } 478 479 static unsigned getEncodedLinkage(const GlobalValue &GV) { 480 switch (GV.getLinkage()) { 481 case GlobalValue::ExternalLinkage: 482 return 0; 483 case GlobalValue::WeakAnyLinkage: 484 return 16; 485 case GlobalValue::AppendingLinkage: 486 return 2; 487 case GlobalValue::InternalLinkage: 488 return 3; 489 case GlobalValue::LinkOnceAnyLinkage: 490 return 18; 491 case GlobalValue::ExternalWeakLinkage: 492 return 7; 493 case GlobalValue::CommonLinkage: 494 return 8; 495 case GlobalValue::PrivateLinkage: 496 return 9; 497 case GlobalValue::WeakODRLinkage: 498 return 17; 499 case GlobalValue::LinkOnceODRLinkage: 500 return 19; 501 case GlobalValue::AvailableExternallyLinkage: 502 return 12; 503 } 504 llvm_unreachable("Invalid linkage"); 505 } 506 507 static unsigned getEncodedVisibility(const GlobalValue &GV) { 508 switch (GV.getVisibility()) { 509 case GlobalValue::DefaultVisibility: return 0; 510 case GlobalValue::HiddenVisibility: return 1; 511 case GlobalValue::ProtectedVisibility: return 2; 512 } 513 llvm_unreachable("Invalid visibility"); 514 } 515 516 static unsigned getEncodedDLLStorageClass(const GlobalValue &GV) { 517 switch (GV.getDLLStorageClass()) { 518 case GlobalValue::DefaultStorageClass: return 0; 519 case GlobalValue::DLLImportStorageClass: return 1; 520 case GlobalValue::DLLExportStorageClass: return 2; 521 } 522 llvm_unreachable("Invalid DLL storage class"); 523 } 524 525 static unsigned getEncodedThreadLocalMode(const GlobalValue &GV) { 526 switch (GV.getThreadLocalMode()) { 527 case GlobalVariable::NotThreadLocal: return 0; 528 case GlobalVariable::GeneralDynamicTLSModel: return 1; 529 case GlobalVariable::LocalDynamicTLSModel: return 2; 530 case GlobalVariable::InitialExecTLSModel: return 3; 531 case GlobalVariable::LocalExecTLSModel: return 4; 532 } 533 llvm_unreachable("Invalid TLS model"); 534 } 535 536 static unsigned getEncodedComdatSelectionKind(const Comdat &C) { 537 switch (C.getSelectionKind()) { 538 case Comdat::Any: 539 return bitc::COMDAT_SELECTION_KIND_ANY; 540 case Comdat::ExactMatch: 541 return bitc::COMDAT_SELECTION_KIND_EXACT_MATCH; 542 case Comdat::Largest: 543 return bitc::COMDAT_SELECTION_KIND_LARGEST; 544 case Comdat::NoDuplicates: 545 return bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES; 546 case Comdat::SameSize: 547 return bitc::COMDAT_SELECTION_KIND_SAME_SIZE; 548 } 549 llvm_unreachable("Invalid selection kind"); 550 } 551 552 static void writeComdats(const ValueEnumerator &VE, BitstreamWriter &Stream) { 553 SmallVector<uint16_t, 64> Vals; 554 for (const Comdat *C : VE.getComdats()) { 555 // COMDAT: [selection_kind, name] 556 Vals.push_back(getEncodedComdatSelectionKind(*C)); 557 size_t Size = C->getName().size(); 558 assert(isUInt<16>(Size)); 559 Vals.push_back(Size); 560 for (char Chr : C->getName()) 561 Vals.push_back((unsigned char)Chr); 562 Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0); 563 Vals.clear(); 564 } 565 } 566 567 // Emit top-level description of module, including target triple, inline asm, 568 // descriptors for global variables, and function prototype info. 569 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE, 570 BitstreamWriter &Stream) { 571 // Emit various pieces of data attached to a module. 572 if (!M->getTargetTriple().empty()) 573 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 574 0/*TODO*/, Stream); 575 const std::string &DL = M->getDataLayoutStr(); 576 if (!DL.empty()) 577 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/, Stream); 578 if (!M->getModuleInlineAsm().empty()) 579 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 580 0/*TODO*/, Stream); 581 582 // Emit information about sections and GC, computing how many there are. Also 583 // compute the maximum alignment value. 584 std::map<std::string, unsigned> SectionMap; 585 std::map<std::string, unsigned> GCMap; 586 unsigned MaxAlignment = 0; 587 unsigned MaxGlobalType = 0; 588 for (const GlobalValue &GV : M->globals()) { 589 MaxAlignment = std::max(MaxAlignment, GV.getAlignment()); 590 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getType())); 591 if (GV.hasSection()) { 592 // Give section names unique ID's. 593 unsigned &Entry = SectionMap[GV.getSection()]; 594 if (!Entry) { 595 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV.getSection(), 596 0/*TODO*/, Stream); 597 Entry = SectionMap.size(); 598 } 599 } 600 } 601 for (const Function &F : *M) { 602 MaxAlignment = std::max(MaxAlignment, F.getAlignment()); 603 if (F.hasSection()) { 604 // Give section names unique ID's. 605 unsigned &Entry = SectionMap[F.getSection()]; 606 if (!Entry) { 607 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F.getSection(), 608 0/*TODO*/, Stream); 609 Entry = SectionMap.size(); 610 } 611 } 612 if (F.hasGC()) { 613 // Same for GC names. 614 unsigned &Entry = GCMap[F.getGC()]; 615 if (!Entry) { 616 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F.getGC(), 617 0/*TODO*/, Stream); 618 Entry = GCMap.size(); 619 } 620 } 621 } 622 623 // Emit abbrev for globals, now that we know # sections and max alignment. 624 unsigned SimpleGVarAbbrev = 0; 625 if (!M->global_empty()) { 626 // Add an abbrev for common globals with no visibility or thread localness. 627 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 628 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 629 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 630 Log2_32_Ceil(MaxGlobalType+1))); 631 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 632 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 633 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage. 634 if (MaxAlignment == 0) // Alignment. 635 Abbv->Add(BitCodeAbbrevOp(0)); 636 else { 637 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 638 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 639 Log2_32_Ceil(MaxEncAlignment+1))); 640 } 641 if (SectionMap.empty()) // Section. 642 Abbv->Add(BitCodeAbbrevOp(0)); 643 else 644 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 645 Log2_32_Ceil(SectionMap.size()+1))); 646 // Don't bother emitting vis + thread local. 647 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 648 } 649 650 // Emit the global variable information. 651 SmallVector<unsigned, 64> Vals; 652 for (const GlobalVariable &GV : M->globals()) { 653 unsigned AbbrevToUse = 0; 654 655 // GLOBALVAR: [type, isconst, initid, 656 // linkage, alignment, section, visibility, threadlocal, 657 // unnamed_addr, externally_initialized, dllstorageclass, 658 // comdat] 659 Vals.push_back(VE.getTypeID(GV.getType())); 660 Vals.push_back(GV.isConstant()); 661 Vals.push_back(GV.isDeclaration() ? 0 : 662 (VE.getValueID(GV.getInitializer()) + 1)); 663 Vals.push_back(getEncodedLinkage(GV)); 664 Vals.push_back(Log2_32(GV.getAlignment())+1); 665 Vals.push_back(GV.hasSection() ? SectionMap[GV.getSection()] : 0); 666 if (GV.isThreadLocal() || 667 GV.getVisibility() != GlobalValue::DefaultVisibility || 668 GV.hasUnnamedAddr() || GV.isExternallyInitialized() || 669 GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass || 670 GV.hasComdat()) { 671 Vals.push_back(getEncodedVisibility(GV)); 672 Vals.push_back(getEncodedThreadLocalMode(GV)); 673 Vals.push_back(GV.hasUnnamedAddr()); 674 Vals.push_back(GV.isExternallyInitialized()); 675 Vals.push_back(getEncodedDLLStorageClass(GV)); 676 Vals.push_back(GV.hasComdat() ? VE.getComdatID(GV.getComdat()) : 0); 677 } else { 678 AbbrevToUse = SimpleGVarAbbrev; 679 } 680 681 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 682 Vals.clear(); 683 } 684 685 // Emit the function proto information. 686 for (const Function &F : *M) { 687 // FUNCTION: [type, callingconv, isproto, linkage, paramattrs, alignment, 688 // section, visibility, gc, unnamed_addr, prologuedata, 689 // dllstorageclass, comdat, prefixdata] 690 Vals.push_back(VE.getTypeID(F.getType())); 691 Vals.push_back(F.getCallingConv()); 692 Vals.push_back(F.isDeclaration()); 693 Vals.push_back(getEncodedLinkage(F)); 694 Vals.push_back(VE.getAttributeID(F.getAttributes())); 695 Vals.push_back(Log2_32(F.getAlignment())+1); 696 Vals.push_back(F.hasSection() ? SectionMap[F.getSection()] : 0); 697 Vals.push_back(getEncodedVisibility(F)); 698 Vals.push_back(F.hasGC() ? GCMap[F.getGC()] : 0); 699 Vals.push_back(F.hasUnnamedAddr()); 700 Vals.push_back(F.hasPrologueData() ? (VE.getValueID(F.getPrologueData()) + 1) 701 : 0); 702 Vals.push_back(getEncodedDLLStorageClass(F)); 703 Vals.push_back(F.hasComdat() ? VE.getComdatID(F.getComdat()) : 0); 704 Vals.push_back(F.hasPrefixData() ? (VE.getValueID(F.getPrefixData()) + 1) 705 : 0); 706 707 unsigned AbbrevToUse = 0; 708 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 709 Vals.clear(); 710 } 711 712 // Emit the alias information. 713 for (const GlobalAlias &A : M->aliases()) { 714 // ALIAS: [alias type, aliasee val#, linkage, visibility] 715 Vals.push_back(VE.getTypeID(A.getType())); 716 Vals.push_back(VE.getValueID(A.getAliasee())); 717 Vals.push_back(getEncodedLinkage(A)); 718 Vals.push_back(getEncodedVisibility(A)); 719 Vals.push_back(getEncodedDLLStorageClass(A)); 720 Vals.push_back(getEncodedThreadLocalMode(A)); 721 Vals.push_back(A.hasUnnamedAddr()); 722 unsigned AbbrevToUse = 0; 723 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 724 Vals.clear(); 725 } 726 } 727 728 static uint64_t GetOptimizationFlags(const Value *V) { 729 uint64_t Flags = 0; 730 731 if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) { 732 if (OBO->hasNoSignedWrap()) 733 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 734 if (OBO->hasNoUnsignedWrap()) 735 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 736 } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) { 737 if (PEO->isExact()) 738 Flags |= 1 << bitc::PEO_EXACT; 739 } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) { 740 if (FPMO->hasUnsafeAlgebra()) 741 Flags |= FastMathFlags::UnsafeAlgebra; 742 if (FPMO->hasNoNaNs()) 743 Flags |= FastMathFlags::NoNaNs; 744 if (FPMO->hasNoInfs()) 745 Flags |= FastMathFlags::NoInfs; 746 if (FPMO->hasNoSignedZeros()) 747 Flags |= FastMathFlags::NoSignedZeros; 748 if (FPMO->hasAllowReciprocal()) 749 Flags |= FastMathFlags::AllowReciprocal; 750 } 751 752 return Flags; 753 } 754 755 static void WriteValueAsMetadata(const ValueAsMetadata *MD, 756 const ValueEnumerator &VE, 757 BitstreamWriter &Stream, 758 SmallVectorImpl<uint64_t> &Record) { 759 // Mimic an MDNode with a value as one operand. 760 Value *V = MD->getValue(); 761 Record.push_back(VE.getTypeID(V->getType())); 762 Record.push_back(VE.getValueID(V)); 763 Stream.EmitRecord(bitc::METADATA_VALUE, Record, 0); 764 Record.clear(); 765 } 766 767 static void WriteMDTuple(const MDTuple *N, const ValueEnumerator &VE, 768 BitstreamWriter &Stream, 769 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev) { 770 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { 771 Metadata *MD = N->getOperand(i); 772 assert(!(MD && isa<LocalAsMetadata>(MD)) && 773 "Unexpected function-local metadata"); 774 Record.push_back(VE.getMetadataOrNullID(MD)); 775 } 776 Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE 777 : bitc::METADATA_NODE, 778 Record, Abbrev); 779 Record.clear(); 780 } 781 782 static void WriteMDLocation(const MDLocation *N, const ValueEnumerator &VE, 783 BitstreamWriter &Stream, 784 SmallVectorImpl<uint64_t> &Record, 785 unsigned Abbrev) { 786 Record.push_back(N->isDistinct()); 787 Record.push_back(N->getLine()); 788 Record.push_back(N->getColumn()); 789 Record.push_back(VE.getMetadataID(N->getScope())); 790 Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt())); 791 792 Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev); 793 Record.clear(); 794 } 795 796 static void WriteGenericDebugNode(const GenericDebugNode *N, 797 const ValueEnumerator &VE, 798 BitstreamWriter &Stream, 799 SmallVectorImpl<uint64_t> &Record, 800 unsigned Abbrev) { 801 Record.push_back(N->isDistinct()); 802 Record.push_back(N->getTag()); 803 Record.push_back(0); // Per-tag version field; unused for now. 804 805 for (auto &I : N->operands()) 806 Record.push_back(VE.getMetadataOrNullID(I)); 807 808 Stream.EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev); 809 Record.clear(); 810 } 811 812 static uint64_t rotateSign(int64_t I) { 813 uint64_t U = I; 814 return I < 0 ? ~(U << 1) : U << 1; 815 } 816 817 static void WriteMDSubrange(const MDSubrange *N, const ValueEnumerator &, 818 BitstreamWriter &Stream, 819 SmallVectorImpl<uint64_t> &Record, 820 unsigned Abbrev) { 821 Record.push_back(N->isDistinct()); 822 Record.push_back(N->getCount()); 823 Record.push_back(rotateSign(N->getLo())); 824 825 Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev); 826 Record.clear(); 827 } 828 829 static void WriteMDEnumerator(const MDEnumerator *, const ValueEnumerator &, 830 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 831 unsigned) { 832 llvm_unreachable("write not implemented"); 833 } 834 static void WriteMDBasicType(const MDBasicType *, const ValueEnumerator &, 835 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 836 unsigned) { 837 llvm_unreachable("write not implemented"); 838 } 839 static void WriteMDDerivedType(const MDDerivedType *, const ValueEnumerator &, 840 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 841 unsigned) { 842 llvm_unreachable("write not implemented"); 843 } 844 static void WriteMDCompositeType(const MDCompositeType *, 845 const ValueEnumerator &, BitstreamWriter &, 846 SmallVectorImpl<uint64_t> &, unsigned) { 847 llvm_unreachable("write not implemented"); 848 } 849 static void WriteMDSubroutineType(const MDSubroutineType *, 850 const ValueEnumerator &, BitstreamWriter &, 851 SmallVectorImpl<uint64_t> &, unsigned) { 852 llvm_unreachable("write not implemented"); 853 } 854 static void WriteMDFile(const MDFile *, const ValueEnumerator &, 855 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 856 unsigned) { 857 llvm_unreachable("write not implemented"); 858 } 859 static void WriteMDCompileUnit(const MDCompileUnit *, const ValueEnumerator &, 860 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 861 unsigned) { 862 llvm_unreachable("write not implemented"); 863 } 864 static void WriteMDSubprogram(const MDSubprogram *, const ValueEnumerator &, 865 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 866 unsigned) { 867 llvm_unreachable("write not implemented"); 868 } 869 static void WriteMDLexicalBlock(const MDLexicalBlock *, const ValueEnumerator &, 870 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 871 unsigned) { 872 llvm_unreachable("write not implemented"); 873 } 874 static void WriteMDLexicalBlockFile(const MDLexicalBlockFile *, 875 const ValueEnumerator &, BitstreamWriter &, 876 SmallVectorImpl<uint64_t> &, unsigned) { 877 llvm_unreachable("write not implemented"); 878 } 879 static void WriteMDNamespace(const MDNamespace *, const ValueEnumerator &, 880 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 881 unsigned) { 882 llvm_unreachable("write not implemented"); 883 } 884 static void WriteMDTemplateTypeParameter(const MDTemplateTypeParameter *, 885 const ValueEnumerator &, 886 BitstreamWriter &, 887 SmallVectorImpl<uint64_t> &, 888 unsigned) { 889 llvm_unreachable("write not implemented"); 890 } 891 static void WriteMDTemplateValueParameter(const MDTemplateValueParameter *, 892 const ValueEnumerator &, 893 BitstreamWriter &, 894 SmallVectorImpl<uint64_t> &, 895 unsigned) { 896 llvm_unreachable("write not implemented"); 897 } 898 static void WriteMDGlobalVariable(const MDGlobalVariable *, 899 const ValueEnumerator &, BitstreamWriter &, 900 SmallVectorImpl<uint64_t> &, unsigned) { 901 llvm_unreachable("write not implemented"); 902 } 903 static void WriteMDLocalVariable(const MDLocalVariable *, 904 const ValueEnumerator &, BitstreamWriter &, 905 SmallVectorImpl<uint64_t> &, unsigned) { 906 llvm_unreachable("write not implemented"); 907 } 908 static void WriteMDExpression(const MDExpression *, const ValueEnumerator &, 909 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 910 unsigned) { 911 llvm_unreachable("write not implemented"); 912 } 913 static void WriteMDObjCProperty(const MDObjCProperty *, const ValueEnumerator &, 914 BitstreamWriter &, SmallVectorImpl<uint64_t> &, 915 unsigned) { 916 llvm_unreachable("write not implemented"); 917 } 918 static void WriteMDImportedEntity(const MDImportedEntity *, 919 const ValueEnumerator &, BitstreamWriter &, 920 SmallVectorImpl<uint64_t> &, unsigned) { 921 llvm_unreachable("write not implemented"); 922 } 923 924 static void WriteModuleMetadata(const Module *M, 925 const ValueEnumerator &VE, 926 BitstreamWriter &Stream) { 927 const auto &MDs = VE.getMDs(); 928 if (MDs.empty() && M->named_metadata_empty()) 929 return; 930 931 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 932 933 unsigned MDSAbbrev = 0; 934 if (VE.hasMDString()) { 935 // Abbrev for METADATA_STRING. 936 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 937 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 938 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 939 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 940 MDSAbbrev = Stream.EmitAbbrev(Abbv); 941 } 942 943 // Initialize MDNode abbreviations. 944 #define HANDLE_MDNODE_LEAF(CLASS) unsigned CLASS##Abbrev = 0; 945 #include "llvm/IR/Metadata.def" 946 947 if (VE.hasMDLocation()) { 948 // Abbrev for METADATA_LOCATION. 949 // 950 // Assume the column is usually under 128, and always output the inlined-at 951 // location (it's never more expensive than building an array size 1). 952 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 953 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_LOCATION)); 954 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 955 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 956 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 957 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 958 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 959 MDLocationAbbrev = Stream.EmitAbbrev(Abbv); 960 } 961 962 if (VE.hasGenericDebugNode()) { 963 // Abbrev for METADATA_GENERIC_DEBUG. 964 // 965 // Assume the column is usually under 128, and always output the inlined-at 966 // location (it's never more expensive than building an array size 1). 967 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 968 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_GENERIC_DEBUG)); 969 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 970 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 971 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 972 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 973 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 974 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 975 GenericDebugNodeAbbrev = Stream.EmitAbbrev(Abbv); 976 } 977 978 unsigned NameAbbrev = 0; 979 if (!M->named_metadata_empty()) { 980 // Abbrev for METADATA_NAME. 981 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 982 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_NAME)); 983 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 984 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 985 NameAbbrev = Stream.EmitAbbrev(Abbv); 986 } 987 988 SmallVector<uint64_t, 64> Record; 989 for (const Metadata *MD : MDs) { 990 if (const MDNode *N = dyn_cast<MDNode>(MD)) { 991 switch (N->getMetadataID()) { 992 default: 993 llvm_unreachable("Invalid MDNode subclass"); 994 #define HANDLE_MDNODE_LEAF(CLASS) \ 995 case Metadata::CLASS##Kind: \ 996 Write##CLASS(cast<CLASS>(N), VE, Stream, Record, CLASS##Abbrev); \ 997 continue; 998 #include "llvm/IR/Metadata.def" 999 } 1000 } 1001 if (const auto *MDC = dyn_cast<ConstantAsMetadata>(MD)) { 1002 WriteValueAsMetadata(MDC, VE, Stream, Record); 1003 continue; 1004 } 1005 const MDString *MDS = cast<MDString>(MD); 1006 // Code: [strchar x N] 1007 Record.append(MDS->bytes_begin(), MDS->bytes_end()); 1008 1009 // Emit the finished record. 1010 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 1011 Record.clear(); 1012 } 1013 1014 // Write named metadata. 1015 for (const NamedMDNode &NMD : M->named_metadata()) { 1016 // Write name. 1017 StringRef Str = NMD.getName(); 1018 Record.append(Str.bytes_begin(), Str.bytes_end()); 1019 Stream.EmitRecord(bitc::METADATA_NAME, Record, NameAbbrev); 1020 Record.clear(); 1021 1022 // Write named metadata operands. 1023 for (const MDNode *N : NMD.operands()) 1024 Record.push_back(VE.getMetadataID(N)); 1025 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0); 1026 Record.clear(); 1027 } 1028 1029 Stream.ExitBlock(); 1030 } 1031 1032 static void WriteFunctionLocalMetadata(const Function &F, 1033 const ValueEnumerator &VE, 1034 BitstreamWriter &Stream) { 1035 bool StartedMetadataBlock = false; 1036 SmallVector<uint64_t, 64> Record; 1037 const SmallVectorImpl<const LocalAsMetadata *> &MDs = 1038 VE.getFunctionLocalMDs(); 1039 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 1040 assert(MDs[i] && "Expected valid function-local metadata"); 1041 if (!StartedMetadataBlock) { 1042 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 1043 StartedMetadataBlock = true; 1044 } 1045 WriteValueAsMetadata(MDs[i], VE, Stream, Record); 1046 } 1047 1048 if (StartedMetadataBlock) 1049 Stream.ExitBlock(); 1050 } 1051 1052 static void WriteMetadataAttachment(const Function &F, 1053 const ValueEnumerator &VE, 1054 BitstreamWriter &Stream) { 1055 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 1056 1057 SmallVector<uint64_t, 64> Record; 1058 1059 // Write metadata attachments 1060 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 1061 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs; 1062 1063 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1064 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1065 I != E; ++I) { 1066 MDs.clear(); 1067 I->getAllMetadataOtherThanDebugLoc(MDs); 1068 1069 // If no metadata, ignore instruction. 1070 if (MDs.empty()) continue; 1071 1072 Record.push_back(VE.getInstructionID(I)); 1073 1074 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 1075 Record.push_back(MDs[i].first); 1076 Record.push_back(VE.getMetadataID(MDs[i].second)); 1077 } 1078 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0); 1079 Record.clear(); 1080 } 1081 1082 Stream.ExitBlock(); 1083 } 1084 1085 static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) { 1086 SmallVector<uint64_t, 64> Record; 1087 1088 // Write metadata kinds 1089 // METADATA_KIND - [n x [id, name]] 1090 SmallVector<StringRef, 8> Names; 1091 M->getMDKindNames(Names); 1092 1093 if (Names.empty()) return; 1094 1095 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 1096 1097 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) { 1098 Record.push_back(MDKindID); 1099 StringRef KName = Names[MDKindID]; 1100 Record.append(KName.begin(), KName.end()); 1101 1102 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 1103 Record.clear(); 1104 } 1105 1106 Stream.ExitBlock(); 1107 } 1108 1109 static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) { 1110 if ((int64_t)V >= 0) 1111 Vals.push_back(V << 1); 1112 else 1113 Vals.push_back((-V << 1) | 1); 1114 } 1115 1116 static void WriteConstants(unsigned FirstVal, unsigned LastVal, 1117 const ValueEnumerator &VE, 1118 BitstreamWriter &Stream, bool isGlobal) { 1119 if (FirstVal == LastVal) return; 1120 1121 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 1122 1123 unsigned AggregateAbbrev = 0; 1124 unsigned String8Abbrev = 0; 1125 unsigned CString7Abbrev = 0; 1126 unsigned CString6Abbrev = 0; 1127 // If this is a constant pool for the module, emit module-specific abbrevs. 1128 if (isGlobal) { 1129 // Abbrev for CST_CODE_AGGREGATE. 1130 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1131 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 1132 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1133 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 1134 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 1135 1136 // Abbrev for CST_CODE_STRING. 1137 Abbv = new BitCodeAbbrev(); 1138 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 1139 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1140 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1141 String8Abbrev = Stream.EmitAbbrev(Abbv); 1142 // Abbrev for CST_CODE_CSTRING. 1143 Abbv = new BitCodeAbbrev(); 1144 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 1145 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1146 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1147 CString7Abbrev = Stream.EmitAbbrev(Abbv); 1148 // Abbrev for CST_CODE_CSTRING. 1149 Abbv = new BitCodeAbbrev(); 1150 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 1151 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1152 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1153 CString6Abbrev = Stream.EmitAbbrev(Abbv); 1154 } 1155 1156 SmallVector<uint64_t, 64> Record; 1157 1158 const ValueEnumerator::ValueList &Vals = VE.getValues(); 1159 Type *LastTy = nullptr; 1160 for (unsigned i = FirstVal; i != LastVal; ++i) { 1161 const Value *V = Vals[i].first; 1162 // If we need to switch types, do so now. 1163 if (V->getType() != LastTy) { 1164 LastTy = V->getType(); 1165 Record.push_back(VE.getTypeID(LastTy)); 1166 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 1167 CONSTANTS_SETTYPE_ABBREV); 1168 Record.clear(); 1169 } 1170 1171 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 1172 Record.push_back(unsigned(IA->hasSideEffects()) | 1173 unsigned(IA->isAlignStack()) << 1 | 1174 unsigned(IA->getDialect()&1) << 2); 1175 1176 // Add the asm string. 1177 const std::string &AsmStr = IA->getAsmString(); 1178 Record.push_back(AsmStr.size()); 1179 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 1180 Record.push_back(AsmStr[i]); 1181 1182 // Add the constraint string. 1183 const std::string &ConstraintStr = IA->getConstraintString(); 1184 Record.push_back(ConstraintStr.size()); 1185 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 1186 Record.push_back(ConstraintStr[i]); 1187 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 1188 Record.clear(); 1189 continue; 1190 } 1191 const Constant *C = cast<Constant>(V); 1192 unsigned Code = -1U; 1193 unsigned AbbrevToUse = 0; 1194 if (C->isNullValue()) { 1195 Code = bitc::CST_CODE_NULL; 1196 } else if (isa<UndefValue>(C)) { 1197 Code = bitc::CST_CODE_UNDEF; 1198 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 1199 if (IV->getBitWidth() <= 64) { 1200 uint64_t V = IV->getSExtValue(); 1201 emitSignedInt64(Record, V); 1202 Code = bitc::CST_CODE_INTEGER; 1203 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 1204 } else { // Wide integers, > 64 bits in size. 1205 // We have an arbitrary precision integer value to write whose 1206 // bit width is > 64. However, in canonical unsigned integer 1207 // format it is likely that the high bits are going to be zero. 1208 // So, we only write the number of active words. 1209 unsigned NWords = IV->getValue().getActiveWords(); 1210 const uint64_t *RawWords = IV->getValue().getRawData(); 1211 for (unsigned i = 0; i != NWords; ++i) { 1212 emitSignedInt64(Record, RawWords[i]); 1213 } 1214 Code = bitc::CST_CODE_WIDE_INTEGER; 1215 } 1216 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 1217 Code = bitc::CST_CODE_FLOAT; 1218 Type *Ty = CFP->getType(); 1219 if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) { 1220 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 1221 } else if (Ty->isX86_FP80Ty()) { 1222 // api needed to prevent premature destruction 1223 // bits are not in the same order as a normal i80 APInt, compensate. 1224 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1225 const uint64_t *p = api.getRawData(); 1226 Record.push_back((p[1] << 48) | (p[0] >> 16)); 1227 Record.push_back(p[0] & 0xffffLL); 1228 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 1229 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1230 const uint64_t *p = api.getRawData(); 1231 Record.push_back(p[0]); 1232 Record.push_back(p[1]); 1233 } else { 1234 assert (0 && "Unknown FP type!"); 1235 } 1236 } else if (isa<ConstantDataSequential>(C) && 1237 cast<ConstantDataSequential>(C)->isString()) { 1238 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C); 1239 // Emit constant strings specially. 1240 unsigned NumElts = Str->getNumElements(); 1241 // If this is a null-terminated string, use the denser CSTRING encoding. 1242 if (Str->isCString()) { 1243 Code = bitc::CST_CODE_CSTRING; 1244 --NumElts; // Don't encode the null, which isn't allowed by char6. 1245 } else { 1246 Code = bitc::CST_CODE_STRING; 1247 AbbrevToUse = String8Abbrev; 1248 } 1249 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 1250 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 1251 for (unsigned i = 0; i != NumElts; ++i) { 1252 unsigned char V = Str->getElementAsInteger(i); 1253 Record.push_back(V); 1254 isCStr7 &= (V & 128) == 0; 1255 if (isCStrChar6) 1256 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 1257 } 1258 1259 if (isCStrChar6) 1260 AbbrevToUse = CString6Abbrev; 1261 else if (isCStr7) 1262 AbbrevToUse = CString7Abbrev; 1263 } else if (const ConstantDataSequential *CDS = 1264 dyn_cast<ConstantDataSequential>(C)) { 1265 Code = bitc::CST_CODE_DATA; 1266 Type *EltTy = CDS->getType()->getElementType(); 1267 if (isa<IntegerType>(EltTy)) { 1268 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) 1269 Record.push_back(CDS->getElementAsInteger(i)); 1270 } else if (EltTy->isFloatTy()) { 1271 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 1272 union { float F; uint32_t I; }; 1273 F = CDS->getElementAsFloat(i); 1274 Record.push_back(I); 1275 } 1276 } else { 1277 assert(EltTy->isDoubleTy() && "Unknown ConstantData element type"); 1278 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 1279 union { double F; uint64_t I; }; 1280 F = CDS->getElementAsDouble(i); 1281 Record.push_back(I); 1282 } 1283 } 1284 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) || 1285 isa<ConstantVector>(C)) { 1286 Code = bitc::CST_CODE_AGGREGATE; 1287 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 1288 Record.push_back(VE.getValueID(C->getOperand(i))); 1289 AbbrevToUse = AggregateAbbrev; 1290 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 1291 switch (CE->getOpcode()) { 1292 default: 1293 if (Instruction::isCast(CE->getOpcode())) { 1294 Code = bitc::CST_CODE_CE_CAST; 1295 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 1296 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1297 Record.push_back(VE.getValueID(C->getOperand(0))); 1298 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 1299 } else { 1300 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 1301 Code = bitc::CST_CODE_CE_BINOP; 1302 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 1303 Record.push_back(VE.getValueID(C->getOperand(0))); 1304 Record.push_back(VE.getValueID(C->getOperand(1))); 1305 uint64_t Flags = GetOptimizationFlags(CE); 1306 if (Flags != 0) 1307 Record.push_back(Flags); 1308 } 1309 break; 1310 case Instruction::GetElementPtr: 1311 Code = bitc::CST_CODE_CE_GEP; 1312 if (cast<GEPOperator>(C)->isInBounds()) 1313 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 1314 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 1315 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 1316 Record.push_back(VE.getValueID(C->getOperand(i))); 1317 } 1318 break; 1319 case Instruction::Select: 1320 Code = bitc::CST_CODE_CE_SELECT; 1321 Record.push_back(VE.getValueID(C->getOperand(0))); 1322 Record.push_back(VE.getValueID(C->getOperand(1))); 1323 Record.push_back(VE.getValueID(C->getOperand(2))); 1324 break; 1325 case Instruction::ExtractElement: 1326 Code = bitc::CST_CODE_CE_EXTRACTELT; 1327 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1328 Record.push_back(VE.getValueID(C->getOperand(0))); 1329 Record.push_back(VE.getTypeID(C->getOperand(1)->getType())); 1330 Record.push_back(VE.getValueID(C->getOperand(1))); 1331 break; 1332 case Instruction::InsertElement: 1333 Code = bitc::CST_CODE_CE_INSERTELT; 1334 Record.push_back(VE.getValueID(C->getOperand(0))); 1335 Record.push_back(VE.getValueID(C->getOperand(1))); 1336 Record.push_back(VE.getTypeID(C->getOperand(2)->getType())); 1337 Record.push_back(VE.getValueID(C->getOperand(2))); 1338 break; 1339 case Instruction::ShuffleVector: 1340 // If the return type and argument types are the same, this is a 1341 // standard shufflevector instruction. If the types are different, 1342 // then the shuffle is widening or truncating the input vectors, and 1343 // the argument type must also be encoded. 1344 if (C->getType() == C->getOperand(0)->getType()) { 1345 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 1346 } else { 1347 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 1348 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1349 } 1350 Record.push_back(VE.getValueID(C->getOperand(0))); 1351 Record.push_back(VE.getValueID(C->getOperand(1))); 1352 Record.push_back(VE.getValueID(C->getOperand(2))); 1353 break; 1354 case Instruction::ICmp: 1355 case Instruction::FCmp: 1356 Code = bitc::CST_CODE_CE_CMP; 1357 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1358 Record.push_back(VE.getValueID(C->getOperand(0))); 1359 Record.push_back(VE.getValueID(C->getOperand(1))); 1360 Record.push_back(CE->getPredicate()); 1361 break; 1362 } 1363 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) { 1364 Code = bitc::CST_CODE_BLOCKADDRESS; 1365 Record.push_back(VE.getTypeID(BA->getFunction()->getType())); 1366 Record.push_back(VE.getValueID(BA->getFunction())); 1367 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock())); 1368 } else { 1369 #ifndef NDEBUG 1370 C->dump(); 1371 #endif 1372 llvm_unreachable("Unknown constant!"); 1373 } 1374 Stream.EmitRecord(Code, Record, AbbrevToUse); 1375 Record.clear(); 1376 } 1377 1378 Stream.ExitBlock(); 1379 } 1380 1381 static void WriteModuleConstants(const ValueEnumerator &VE, 1382 BitstreamWriter &Stream) { 1383 const ValueEnumerator::ValueList &Vals = VE.getValues(); 1384 1385 // Find the first constant to emit, which is the first non-globalvalue value. 1386 // We know globalvalues have been emitted by WriteModuleInfo. 1387 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 1388 if (!isa<GlobalValue>(Vals[i].first)) { 1389 WriteConstants(i, Vals.size(), VE, Stream, true); 1390 return; 1391 } 1392 } 1393 } 1394 1395 /// PushValueAndType - The file has to encode both the value and type id for 1396 /// many values, because we need to know what type to create for forward 1397 /// references. However, most operands are not forward references, so this type 1398 /// field is not needed. 1399 /// 1400 /// This function adds V's value ID to Vals. If the value ID is higher than the 1401 /// instruction ID, then it is a forward reference, and it also includes the 1402 /// type ID. The value ID that is written is encoded relative to the InstID. 1403 static bool PushValueAndType(const Value *V, unsigned InstID, 1404 SmallVectorImpl<unsigned> &Vals, 1405 ValueEnumerator &VE) { 1406 unsigned ValID = VE.getValueID(V); 1407 // Make encoding relative to the InstID. 1408 Vals.push_back(InstID - ValID); 1409 if (ValID >= InstID) { 1410 Vals.push_back(VE.getTypeID(V->getType())); 1411 return true; 1412 } 1413 return false; 1414 } 1415 1416 /// pushValue - Like PushValueAndType, but where the type of the value is 1417 /// omitted (perhaps it was already encoded in an earlier operand). 1418 static void pushValue(const Value *V, unsigned InstID, 1419 SmallVectorImpl<unsigned> &Vals, 1420 ValueEnumerator &VE) { 1421 unsigned ValID = VE.getValueID(V); 1422 Vals.push_back(InstID - ValID); 1423 } 1424 1425 static void pushValueSigned(const Value *V, unsigned InstID, 1426 SmallVectorImpl<uint64_t> &Vals, 1427 ValueEnumerator &VE) { 1428 unsigned ValID = VE.getValueID(V); 1429 int64_t diff = ((int32_t)InstID - (int32_t)ValID); 1430 emitSignedInt64(Vals, diff); 1431 } 1432 1433 /// WriteInstruction - Emit an instruction to the specified stream. 1434 static void WriteInstruction(const Instruction &I, unsigned InstID, 1435 ValueEnumerator &VE, BitstreamWriter &Stream, 1436 SmallVectorImpl<unsigned> &Vals) { 1437 unsigned Code = 0; 1438 unsigned AbbrevToUse = 0; 1439 VE.setInstructionID(&I); 1440 switch (I.getOpcode()) { 1441 default: 1442 if (Instruction::isCast(I.getOpcode())) { 1443 Code = bitc::FUNC_CODE_INST_CAST; 1444 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1445 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 1446 Vals.push_back(VE.getTypeID(I.getType())); 1447 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 1448 } else { 1449 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 1450 Code = bitc::FUNC_CODE_INST_BINOP; 1451 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1452 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 1453 pushValue(I.getOperand(1), InstID, Vals, VE); 1454 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 1455 uint64_t Flags = GetOptimizationFlags(&I); 1456 if (Flags != 0) { 1457 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 1458 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 1459 Vals.push_back(Flags); 1460 } 1461 } 1462 break; 1463 1464 case Instruction::GetElementPtr: 1465 Code = bitc::FUNC_CODE_INST_GEP; 1466 if (cast<GEPOperator>(&I)->isInBounds()) 1467 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 1468 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1469 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1470 break; 1471 case Instruction::ExtractValue: { 1472 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 1473 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1474 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 1475 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 1476 Vals.push_back(*i); 1477 break; 1478 } 1479 case Instruction::InsertValue: { 1480 Code = bitc::FUNC_CODE_INST_INSERTVAL; 1481 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1482 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1483 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 1484 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 1485 Vals.push_back(*i); 1486 break; 1487 } 1488 case Instruction::Select: 1489 Code = bitc::FUNC_CODE_INST_VSELECT; 1490 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1491 pushValue(I.getOperand(2), InstID, Vals, VE); 1492 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1493 break; 1494 case Instruction::ExtractElement: 1495 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 1496 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1497 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1498 break; 1499 case Instruction::InsertElement: 1500 Code = bitc::FUNC_CODE_INST_INSERTELT; 1501 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1502 pushValue(I.getOperand(1), InstID, Vals, VE); 1503 PushValueAndType(I.getOperand(2), InstID, Vals, VE); 1504 break; 1505 case Instruction::ShuffleVector: 1506 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 1507 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1508 pushValue(I.getOperand(1), InstID, Vals, VE); 1509 pushValue(I.getOperand(2), InstID, Vals, VE); 1510 break; 1511 case Instruction::ICmp: 1512 case Instruction::FCmp: 1513 // compare returning Int1Ty or vector of Int1Ty 1514 Code = bitc::FUNC_CODE_INST_CMP2; 1515 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1516 pushValue(I.getOperand(1), InstID, Vals, VE); 1517 Vals.push_back(cast<CmpInst>(I).getPredicate()); 1518 break; 1519 1520 case Instruction::Ret: 1521 { 1522 Code = bitc::FUNC_CODE_INST_RET; 1523 unsigned NumOperands = I.getNumOperands(); 1524 if (NumOperands == 0) 1525 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 1526 else if (NumOperands == 1) { 1527 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1528 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 1529 } else { 1530 for (unsigned i = 0, e = NumOperands; i != e; ++i) 1531 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1532 } 1533 } 1534 break; 1535 case Instruction::Br: 1536 { 1537 Code = bitc::FUNC_CODE_INST_BR; 1538 const BranchInst &II = cast<BranchInst>(I); 1539 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 1540 if (II.isConditional()) { 1541 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 1542 pushValue(II.getCondition(), InstID, Vals, VE); 1543 } 1544 } 1545 break; 1546 case Instruction::Switch: 1547 { 1548 Code = bitc::FUNC_CODE_INST_SWITCH; 1549 const SwitchInst &SI = cast<SwitchInst>(I); 1550 Vals.push_back(VE.getTypeID(SI.getCondition()->getType())); 1551 pushValue(SI.getCondition(), InstID, Vals, VE); 1552 Vals.push_back(VE.getValueID(SI.getDefaultDest())); 1553 for (SwitchInst::ConstCaseIt i = SI.case_begin(), e = SI.case_end(); 1554 i != e; ++i) { 1555 Vals.push_back(VE.getValueID(i.getCaseValue())); 1556 Vals.push_back(VE.getValueID(i.getCaseSuccessor())); 1557 } 1558 } 1559 break; 1560 case Instruction::IndirectBr: 1561 Code = bitc::FUNC_CODE_INST_INDIRECTBR; 1562 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1563 // Encode the address operand as relative, but not the basic blocks. 1564 pushValue(I.getOperand(0), InstID, Vals, VE); 1565 for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) 1566 Vals.push_back(VE.getValueID(I.getOperand(i))); 1567 break; 1568 1569 case Instruction::Invoke: { 1570 const InvokeInst *II = cast<InvokeInst>(&I); 1571 const Value *Callee(II->getCalledValue()); 1572 PointerType *PTy = cast<PointerType>(Callee->getType()); 1573 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1574 Code = bitc::FUNC_CODE_INST_INVOKE; 1575 1576 Vals.push_back(VE.getAttributeID(II->getAttributes())); 1577 Vals.push_back(II->getCallingConv()); 1578 Vals.push_back(VE.getValueID(II->getNormalDest())); 1579 Vals.push_back(VE.getValueID(II->getUnwindDest())); 1580 PushValueAndType(Callee, InstID, Vals, VE); 1581 1582 // Emit value #'s for the fixed parameters. 1583 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1584 pushValue(I.getOperand(i), InstID, Vals, VE); // fixed param. 1585 1586 // Emit type/value pairs for varargs params. 1587 if (FTy->isVarArg()) { 1588 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3; 1589 i != e; ++i) 1590 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 1591 } 1592 break; 1593 } 1594 case Instruction::Resume: 1595 Code = bitc::FUNC_CODE_INST_RESUME; 1596 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1597 break; 1598 case Instruction::Unreachable: 1599 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 1600 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 1601 break; 1602 1603 case Instruction::PHI: { 1604 const PHINode &PN = cast<PHINode>(I); 1605 Code = bitc::FUNC_CODE_INST_PHI; 1606 // With the newer instruction encoding, forward references could give 1607 // negative valued IDs. This is most common for PHIs, so we use 1608 // signed VBRs. 1609 SmallVector<uint64_t, 128> Vals64; 1610 Vals64.push_back(VE.getTypeID(PN.getType())); 1611 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { 1612 pushValueSigned(PN.getIncomingValue(i), InstID, Vals64, VE); 1613 Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i))); 1614 } 1615 // Emit a Vals64 vector and exit. 1616 Stream.EmitRecord(Code, Vals64, AbbrevToUse); 1617 Vals64.clear(); 1618 return; 1619 } 1620 1621 case Instruction::LandingPad: { 1622 const LandingPadInst &LP = cast<LandingPadInst>(I); 1623 Code = bitc::FUNC_CODE_INST_LANDINGPAD; 1624 Vals.push_back(VE.getTypeID(LP.getType())); 1625 PushValueAndType(LP.getPersonalityFn(), InstID, Vals, VE); 1626 Vals.push_back(LP.isCleanup()); 1627 Vals.push_back(LP.getNumClauses()); 1628 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) { 1629 if (LP.isCatch(I)) 1630 Vals.push_back(LandingPadInst::Catch); 1631 else 1632 Vals.push_back(LandingPadInst::Filter); 1633 PushValueAndType(LP.getClause(I), InstID, Vals, VE); 1634 } 1635 break; 1636 } 1637 1638 case Instruction::Alloca: { 1639 Code = bitc::FUNC_CODE_INST_ALLOCA; 1640 Vals.push_back(VE.getTypeID(I.getType())); 1641 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1642 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1643 const AllocaInst &AI = cast<AllocaInst>(I); 1644 unsigned AlignRecord = Log2_32(AI.getAlignment()) + 1; 1645 assert(Log2_32(Value::MaximumAlignment) + 1 < 1 << 5 && 1646 "not enough bits for maximum alignment"); 1647 assert(AlignRecord < 1 << 5 && "alignment greater than 1 << 64"); 1648 AlignRecord |= AI.isUsedWithInAlloca() << 5; 1649 Vals.push_back(AlignRecord); 1650 break; 1651 } 1652 1653 case Instruction::Load: 1654 if (cast<LoadInst>(I).isAtomic()) { 1655 Code = bitc::FUNC_CODE_INST_LOADATOMIC; 1656 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1657 } else { 1658 Code = bitc::FUNC_CODE_INST_LOAD; 1659 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1660 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1661 } 1662 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1663 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1664 if (cast<LoadInst>(I).isAtomic()) { 1665 Vals.push_back(GetEncodedOrdering(cast<LoadInst>(I).getOrdering())); 1666 Vals.push_back(GetEncodedSynchScope(cast<LoadInst>(I).getSynchScope())); 1667 } 1668 break; 1669 case Instruction::Store: 1670 if (cast<StoreInst>(I).isAtomic()) 1671 Code = bitc::FUNC_CODE_INST_STOREATOMIC; 1672 else 1673 Code = bitc::FUNC_CODE_INST_STORE; 1674 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1675 pushValue(I.getOperand(0), InstID, Vals, VE); // val. 1676 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1677 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1678 if (cast<StoreInst>(I).isAtomic()) { 1679 Vals.push_back(GetEncodedOrdering(cast<StoreInst>(I).getOrdering())); 1680 Vals.push_back(GetEncodedSynchScope(cast<StoreInst>(I).getSynchScope())); 1681 } 1682 break; 1683 case Instruction::AtomicCmpXchg: 1684 Code = bitc::FUNC_CODE_INST_CMPXCHG; 1685 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1686 pushValue(I.getOperand(1), InstID, Vals, VE); // cmp. 1687 pushValue(I.getOperand(2), InstID, Vals, VE); // newval. 1688 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile()); 1689 Vals.push_back(GetEncodedOrdering( 1690 cast<AtomicCmpXchgInst>(I).getSuccessOrdering())); 1691 Vals.push_back(GetEncodedSynchScope( 1692 cast<AtomicCmpXchgInst>(I).getSynchScope())); 1693 Vals.push_back(GetEncodedOrdering( 1694 cast<AtomicCmpXchgInst>(I).getFailureOrdering())); 1695 Vals.push_back(cast<AtomicCmpXchgInst>(I).isWeak()); 1696 break; 1697 case Instruction::AtomicRMW: 1698 Code = bitc::FUNC_CODE_INST_ATOMICRMW; 1699 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1700 pushValue(I.getOperand(1), InstID, Vals, VE); // val. 1701 Vals.push_back(GetEncodedRMWOperation( 1702 cast<AtomicRMWInst>(I).getOperation())); 1703 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile()); 1704 Vals.push_back(GetEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering())); 1705 Vals.push_back(GetEncodedSynchScope( 1706 cast<AtomicRMWInst>(I).getSynchScope())); 1707 break; 1708 case Instruction::Fence: 1709 Code = bitc::FUNC_CODE_INST_FENCE; 1710 Vals.push_back(GetEncodedOrdering(cast<FenceInst>(I).getOrdering())); 1711 Vals.push_back(GetEncodedSynchScope(cast<FenceInst>(I).getSynchScope())); 1712 break; 1713 case Instruction::Call: { 1714 const CallInst &CI = cast<CallInst>(I); 1715 PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType()); 1716 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1717 1718 Code = bitc::FUNC_CODE_INST_CALL; 1719 1720 Vals.push_back(VE.getAttributeID(CI.getAttributes())); 1721 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()) | 1722 unsigned(CI.isMustTailCall()) << 14); 1723 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee 1724 1725 // Emit value #'s for the fixed parameters. 1726 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 1727 // Check for labels (can happen with asm labels). 1728 if (FTy->getParamType(i)->isLabelTy()) 1729 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); 1730 else 1731 pushValue(CI.getArgOperand(i), InstID, Vals, VE); // fixed param. 1732 } 1733 1734 // Emit type/value pairs for varargs params. 1735 if (FTy->isVarArg()) { 1736 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands(); 1737 i != e; ++i) 1738 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs 1739 } 1740 break; 1741 } 1742 case Instruction::VAArg: 1743 Code = bitc::FUNC_CODE_INST_VAARG; 1744 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1745 pushValue(I.getOperand(0), InstID, Vals, VE); // valist. 1746 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1747 break; 1748 } 1749 1750 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1751 Vals.clear(); 1752 } 1753 1754 // Emit names for globals/functions etc. 1755 static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1756 const ValueEnumerator &VE, 1757 BitstreamWriter &Stream) { 1758 if (VST.empty()) return; 1759 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1760 1761 // FIXME: Set up the abbrev, we know how many values there are! 1762 // FIXME: We know if the type names can use 7-bit ascii. 1763 SmallVector<unsigned, 64> NameVals; 1764 1765 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1766 SI != SE; ++SI) { 1767 1768 const ValueName &Name = *SI; 1769 1770 // Figure out the encoding to use for the name. 1771 bool is7Bit = true; 1772 bool isChar6 = true; 1773 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1774 C != E; ++C) { 1775 if (isChar6) 1776 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1777 if ((unsigned char)*C & 128) { 1778 is7Bit = false; 1779 break; // don't bother scanning the rest. 1780 } 1781 } 1782 1783 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1784 1785 // VST_ENTRY: [valueid, namechar x N] 1786 // VST_BBENTRY: [bbid, namechar x N] 1787 unsigned Code; 1788 if (isa<BasicBlock>(SI->getValue())) { 1789 Code = bitc::VST_CODE_BBENTRY; 1790 if (isChar6) 1791 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1792 } else { 1793 Code = bitc::VST_CODE_ENTRY; 1794 if (isChar6) 1795 AbbrevToUse = VST_ENTRY_6_ABBREV; 1796 else if (is7Bit) 1797 AbbrevToUse = VST_ENTRY_7_ABBREV; 1798 } 1799 1800 NameVals.push_back(VE.getValueID(SI->getValue())); 1801 for (const char *P = Name.getKeyData(), 1802 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1803 NameVals.push_back((unsigned char)*P); 1804 1805 // Emit the finished record. 1806 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1807 NameVals.clear(); 1808 } 1809 Stream.ExitBlock(); 1810 } 1811 1812 static void WriteUseList(ValueEnumerator &VE, UseListOrder &&Order, 1813 BitstreamWriter &Stream) { 1814 assert(Order.Shuffle.size() >= 2 && "Shuffle too small"); 1815 unsigned Code; 1816 if (isa<BasicBlock>(Order.V)) 1817 Code = bitc::USELIST_CODE_BB; 1818 else 1819 Code = bitc::USELIST_CODE_DEFAULT; 1820 1821 SmallVector<uint64_t, 64> Record; 1822 for (unsigned I : Order.Shuffle) 1823 Record.push_back(I); 1824 Record.push_back(VE.getValueID(Order.V)); 1825 Stream.EmitRecord(Code, Record); 1826 } 1827 1828 static void WriteUseListBlock(const Function *F, ValueEnumerator &VE, 1829 BitstreamWriter &Stream) { 1830 auto hasMore = [&]() { 1831 return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F; 1832 }; 1833 if (!hasMore()) 1834 // Nothing to do. 1835 return; 1836 1837 Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3); 1838 while (hasMore()) { 1839 WriteUseList(VE, std::move(VE.UseListOrders.back()), Stream); 1840 VE.UseListOrders.pop_back(); 1841 } 1842 Stream.ExitBlock(); 1843 } 1844 1845 /// WriteFunction - Emit a function body to the module stream. 1846 static void WriteFunction(const Function &F, ValueEnumerator &VE, 1847 BitstreamWriter &Stream) { 1848 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1849 VE.incorporateFunction(F); 1850 1851 SmallVector<unsigned, 64> Vals; 1852 1853 // Emit the number of basic blocks, so the reader can create them ahead of 1854 // time. 1855 Vals.push_back(VE.getBasicBlocks().size()); 1856 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1857 Vals.clear(); 1858 1859 // If there are function-local constants, emit them now. 1860 unsigned CstStart, CstEnd; 1861 VE.getFunctionConstantRange(CstStart, CstEnd); 1862 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1863 1864 // If there is function-local metadata, emit it now. 1865 WriteFunctionLocalMetadata(F, VE, Stream); 1866 1867 // Keep a running idea of what the instruction ID is. 1868 unsigned InstID = CstEnd; 1869 1870 bool NeedsMetadataAttachment = false; 1871 1872 DebugLoc LastDL; 1873 1874 // Finally, emit all the instructions, in order. 1875 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1876 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1877 I != E; ++I) { 1878 WriteInstruction(*I, InstID, VE, Stream, Vals); 1879 1880 if (!I->getType()->isVoidTy()) 1881 ++InstID; 1882 1883 // If the instruction has metadata, write a metadata attachment later. 1884 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc(); 1885 1886 // If the instruction has a debug location, emit it. 1887 DebugLoc DL = I->getDebugLoc(); 1888 if (DL.isUnknown()) { 1889 // nothing todo. 1890 } else if (DL == LastDL) { 1891 // Just repeat the same debug loc as last time. 1892 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals); 1893 } else { 1894 MDNode *Scope, *IA; 1895 DL.getScopeAndInlinedAt(Scope, IA, I->getContext()); 1896 assert(Scope && "Expected valid scope"); 1897 1898 Vals.push_back(DL.getLine()); 1899 Vals.push_back(DL.getCol()); 1900 Vals.push_back(VE.getMetadataOrNullID(Scope)); 1901 Vals.push_back(VE.getMetadataOrNullID(IA)); 1902 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals); 1903 Vals.clear(); 1904 1905 LastDL = DL; 1906 } 1907 } 1908 1909 // Emit names for all the instructions etc. 1910 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1911 1912 if (NeedsMetadataAttachment) 1913 WriteMetadataAttachment(F, VE, Stream); 1914 if (shouldPreserveBitcodeUseListOrder()) 1915 WriteUseListBlock(&F, VE, Stream); 1916 VE.purgeFunction(); 1917 Stream.ExitBlock(); 1918 } 1919 1920 // Emit blockinfo, which defines the standard abbreviations etc. 1921 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) { 1922 // We only want to emit block info records for blocks that have multiple 1923 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. 1924 // Other blocks can define their abbrevs inline. 1925 Stream.EnterBlockInfoBlock(2); 1926 1927 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1928 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1929 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1930 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1931 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1932 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1933 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1934 Abbv) != VST_ENTRY_8_ABBREV) 1935 llvm_unreachable("Unexpected abbrev ordering!"); 1936 } 1937 1938 { // 7-bit fixed width VST_ENTRY strings. 1939 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1940 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1941 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1942 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1943 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1944 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1945 Abbv) != VST_ENTRY_7_ABBREV) 1946 llvm_unreachable("Unexpected abbrev ordering!"); 1947 } 1948 { // 6-bit char6 VST_ENTRY strings. 1949 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1950 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1951 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1952 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1953 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1954 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1955 Abbv) != VST_ENTRY_6_ABBREV) 1956 llvm_unreachable("Unexpected abbrev ordering!"); 1957 } 1958 { // 6-bit char6 VST_BBENTRY strings. 1959 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1960 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1961 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1962 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1963 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1964 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1965 Abbv) != VST_BBENTRY_6_ABBREV) 1966 llvm_unreachable("Unexpected abbrev ordering!"); 1967 } 1968 1969 1970 1971 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1972 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1973 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1974 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1975 Log2_32_Ceil(VE.getTypes().size()+1))); 1976 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1977 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1978 llvm_unreachable("Unexpected abbrev ordering!"); 1979 } 1980 1981 { // INTEGER abbrev for CONSTANTS_BLOCK. 1982 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1983 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1984 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1985 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1986 Abbv) != CONSTANTS_INTEGER_ABBREV) 1987 llvm_unreachable("Unexpected abbrev ordering!"); 1988 } 1989 1990 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1991 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1992 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1993 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1994 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1995 Log2_32_Ceil(VE.getTypes().size()+1))); 1996 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1997 1998 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1999 Abbv) != CONSTANTS_CE_CAST_Abbrev) 2000 llvm_unreachable("Unexpected abbrev ordering!"); 2001 } 2002 { // NULL abbrev for CONSTANTS_BLOCK. 2003 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2004 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 2005 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 2006 Abbv) != CONSTANTS_NULL_Abbrev) 2007 llvm_unreachable("Unexpected abbrev ordering!"); 2008 } 2009 2010 // FIXME: This should only use space for first class types! 2011 2012 { // INST_LOAD abbrev for FUNCTION_BLOCK. 2013 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2014 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 2015 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 2016 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 2017 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 2018 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2019 Abbv) != FUNCTION_INST_LOAD_ABBREV) 2020 llvm_unreachable("Unexpected abbrev ordering!"); 2021 } 2022 { // INST_BINOP abbrev for FUNCTION_BLOCK. 2023 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2024 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 2025 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 2026 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 2027 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 2028 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2029 Abbv) != FUNCTION_INST_BINOP_ABBREV) 2030 llvm_unreachable("Unexpected abbrev ordering!"); 2031 } 2032 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 2033 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2034 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 2035 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 2036 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 2037 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 2038 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 2039 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2040 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 2041 llvm_unreachable("Unexpected abbrev ordering!"); 2042 } 2043 { // INST_CAST abbrev for FUNCTION_BLOCK. 2044 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2045 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 2046 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 2047 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 2048 Log2_32_Ceil(VE.getTypes().size()+1))); 2049 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 2050 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2051 Abbv) != FUNCTION_INST_CAST_ABBREV) 2052 llvm_unreachable("Unexpected abbrev ordering!"); 2053 } 2054 2055 { // INST_RET abbrev for FUNCTION_BLOCK. 2056 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2057 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 2058 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2059 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 2060 llvm_unreachable("Unexpected abbrev ordering!"); 2061 } 2062 { // INST_RET abbrev for FUNCTION_BLOCK. 2063 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2064 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 2065 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 2066 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2067 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 2068 llvm_unreachable("Unexpected abbrev ordering!"); 2069 } 2070 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 2071 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2072 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 2073 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2074 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 2075 llvm_unreachable("Unexpected abbrev ordering!"); 2076 } 2077 2078 Stream.ExitBlock(); 2079 } 2080 2081 /// WriteModule - Emit the specified module to the bitstream. 2082 static void WriteModule(const Module *M, BitstreamWriter &Stream) { 2083 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 2084 2085 SmallVector<unsigned, 1> Vals; 2086 unsigned CurVersion = 1; 2087 Vals.push_back(CurVersion); 2088 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 2089 2090 // Analyze the module, enumerating globals, functions, etc. 2091 ValueEnumerator VE(*M); 2092 2093 // Emit blockinfo, which defines the standard abbreviations etc. 2094 WriteBlockInfo(VE, Stream); 2095 2096 // Emit information about attribute groups. 2097 WriteAttributeGroupTable(VE, Stream); 2098 2099 // Emit information about parameter attributes. 2100 WriteAttributeTable(VE, Stream); 2101 2102 // Emit information describing all of the types in the module. 2103 WriteTypeTable(VE, Stream); 2104 2105 writeComdats(VE, Stream); 2106 2107 // Emit top-level description of module, including target triple, inline asm, 2108 // descriptors for global variables, and function prototype info. 2109 WriteModuleInfo(M, VE, Stream); 2110 2111 // Emit constants. 2112 WriteModuleConstants(VE, Stream); 2113 2114 // Emit metadata. 2115 WriteModuleMetadata(M, VE, Stream); 2116 2117 // Emit metadata. 2118 WriteModuleMetadataStore(M, Stream); 2119 2120 // Emit names for globals/functions etc. 2121 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 2122 2123 // Emit module-level use-lists. 2124 if (shouldPreserveBitcodeUseListOrder()) 2125 WriteUseListBlock(nullptr, VE, Stream); 2126 2127 // Emit function bodies. 2128 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) 2129 if (!F->isDeclaration()) 2130 WriteFunction(*F, VE, Stream); 2131 2132 Stream.ExitBlock(); 2133 } 2134 2135 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 2136 /// header and trailer to make it compatible with the system archiver. To do 2137 /// this we emit the following header, and then emit a trailer that pads the 2138 /// file out to be a multiple of 16 bytes. 2139 /// 2140 /// struct bc_header { 2141 /// uint32_t Magic; // 0x0B17C0DE 2142 /// uint32_t Version; // Version, currently always 0. 2143 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 2144 /// uint32_t BitcodeSize; // Size of traditional bitcode file. 2145 /// uint32_t CPUType; // CPU specifier. 2146 /// ... potentially more later ... 2147 /// }; 2148 enum { 2149 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 2150 DarwinBCHeaderSize = 5*4 2151 }; 2152 2153 static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer, 2154 uint32_t &Position) { 2155 Buffer[Position + 0] = (unsigned char) (Value >> 0); 2156 Buffer[Position + 1] = (unsigned char) (Value >> 8); 2157 Buffer[Position + 2] = (unsigned char) (Value >> 16); 2158 Buffer[Position + 3] = (unsigned char) (Value >> 24); 2159 Position += 4; 2160 } 2161 2162 static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer, 2163 const Triple &TT) { 2164 unsigned CPUType = ~0U; 2165 2166 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*, 2167 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic 2168 // number from /usr/include/mach/machine.h. It is ok to reproduce the 2169 // specific constants here because they are implicitly part of the Darwin ABI. 2170 enum { 2171 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 2172 DARWIN_CPU_TYPE_X86 = 7, 2173 DARWIN_CPU_TYPE_ARM = 12, 2174 DARWIN_CPU_TYPE_POWERPC = 18 2175 }; 2176 2177 Triple::ArchType Arch = TT.getArch(); 2178 if (Arch == Triple::x86_64) 2179 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 2180 else if (Arch == Triple::x86) 2181 CPUType = DARWIN_CPU_TYPE_X86; 2182 else if (Arch == Triple::ppc) 2183 CPUType = DARWIN_CPU_TYPE_POWERPC; 2184 else if (Arch == Triple::ppc64) 2185 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 2186 else if (Arch == Triple::arm || Arch == Triple::thumb) 2187 CPUType = DARWIN_CPU_TYPE_ARM; 2188 2189 // Traditional Bitcode starts after header. 2190 assert(Buffer.size() >= DarwinBCHeaderSize && 2191 "Expected header size to be reserved"); 2192 unsigned BCOffset = DarwinBCHeaderSize; 2193 unsigned BCSize = Buffer.size()-DarwinBCHeaderSize; 2194 2195 // Write the magic and version. 2196 unsigned Position = 0; 2197 WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position); 2198 WriteInt32ToBuffer(0 , Buffer, Position); // Version. 2199 WriteInt32ToBuffer(BCOffset , Buffer, Position); 2200 WriteInt32ToBuffer(BCSize , Buffer, Position); 2201 WriteInt32ToBuffer(CPUType , Buffer, Position); 2202 2203 // If the file is not a multiple of 16 bytes, insert dummy padding. 2204 while (Buffer.size() & 15) 2205 Buffer.push_back(0); 2206 } 2207 2208 /// WriteBitcodeToFile - Write the specified module to the specified output 2209 /// stream. 2210 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 2211 SmallVector<char, 0> Buffer; 2212 Buffer.reserve(256*1024); 2213 2214 // If this is darwin or another generic macho target, reserve space for the 2215 // header. 2216 Triple TT(M->getTargetTriple()); 2217 if (TT.isOSDarwin()) 2218 Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0); 2219 2220 // Emit the module into the buffer. 2221 { 2222 BitstreamWriter Stream(Buffer); 2223 2224 // Emit the file header. 2225 Stream.Emit((unsigned)'B', 8); 2226 Stream.Emit((unsigned)'C', 8); 2227 Stream.Emit(0x0, 4); 2228 Stream.Emit(0xC, 4); 2229 Stream.Emit(0xE, 4); 2230 Stream.Emit(0xD, 4); 2231 2232 // Emit the module. 2233 WriteModule(M, Stream); 2234 } 2235 2236 if (TT.isOSDarwin()) 2237 EmitDarwinBCHeaderAndTrailer(Buffer, TT); 2238 2239 // Write the generated bitstream to "Out". 2240 Out.write((char*)&Buffer.front(), Buffer.size()); 2241 } 2242