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> 35using 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. 39enum { 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 FUNCTION_INST_GEP_ABBREV, 61}; 62 63static unsigned GetEncodedCastOpcode(unsigned Opcode) { 64 switch (Opcode) { 65 default: llvm_unreachable("Unknown cast instruction!"); 66 case Instruction::Trunc : return bitc::CAST_TRUNC; 67 case Instruction::ZExt : return bitc::CAST_ZEXT; 68 case Instruction::SExt : return bitc::CAST_SEXT; 69 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 70 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 71 case Instruction::UIToFP : return bitc::CAST_UITOFP; 72 case Instruction::SIToFP : return bitc::CAST_SITOFP; 73 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 74 case Instruction::FPExt : return bitc::CAST_FPEXT; 75 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 76 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 77 case Instruction::BitCast : return bitc::CAST_BITCAST; 78 case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST; 79 } 80} 81 82static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 83 switch (Opcode) { 84 default: llvm_unreachable("Unknown binary instruction!"); 85 case Instruction::Add: 86 case Instruction::FAdd: return bitc::BINOP_ADD; 87 case Instruction::Sub: 88 case Instruction::FSub: return bitc::BINOP_SUB; 89 case Instruction::Mul: 90 case Instruction::FMul: return bitc::BINOP_MUL; 91 case Instruction::UDiv: return bitc::BINOP_UDIV; 92 case Instruction::FDiv: 93 case Instruction::SDiv: return bitc::BINOP_SDIV; 94 case Instruction::URem: return bitc::BINOP_UREM; 95 case Instruction::FRem: 96 case Instruction::SRem: return bitc::BINOP_SREM; 97 case Instruction::Shl: return bitc::BINOP_SHL; 98 case Instruction::LShr: return bitc::BINOP_LSHR; 99 case Instruction::AShr: return bitc::BINOP_ASHR; 100 case Instruction::And: return bitc::BINOP_AND; 101 case Instruction::Or: return bitc::BINOP_OR; 102 case Instruction::Xor: return bitc::BINOP_XOR; 103 } 104} 105 106static unsigned GetEncodedRMWOperation(AtomicRMWInst::BinOp Op) { 107 switch (Op) { 108 default: llvm_unreachable("Unknown RMW operation!"); 109 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG; 110 case AtomicRMWInst::Add: return bitc::RMW_ADD; 111 case AtomicRMWInst::Sub: return bitc::RMW_SUB; 112 case AtomicRMWInst::And: return bitc::RMW_AND; 113 case AtomicRMWInst::Nand: return bitc::RMW_NAND; 114 case AtomicRMWInst::Or: return bitc::RMW_OR; 115 case AtomicRMWInst::Xor: return bitc::RMW_XOR; 116 case AtomicRMWInst::Max: return bitc::RMW_MAX; 117 case AtomicRMWInst::Min: return bitc::RMW_MIN; 118 case AtomicRMWInst::UMax: return bitc::RMW_UMAX; 119 case AtomicRMWInst::UMin: return bitc::RMW_UMIN; 120 } 121} 122 123static unsigned GetEncodedOrdering(AtomicOrdering Ordering) { 124 switch (Ordering) { 125 case NotAtomic: return bitc::ORDERING_NOTATOMIC; 126 case Unordered: return bitc::ORDERING_UNORDERED; 127 case Monotonic: return bitc::ORDERING_MONOTONIC; 128 case Acquire: return bitc::ORDERING_ACQUIRE; 129 case Release: return bitc::ORDERING_RELEASE; 130 case AcquireRelease: return bitc::ORDERING_ACQREL; 131 case SequentiallyConsistent: return bitc::ORDERING_SEQCST; 132 } 133 llvm_unreachable("Invalid ordering"); 134} 135 136static unsigned GetEncodedSynchScope(SynchronizationScope SynchScope) { 137 switch (SynchScope) { 138 case SingleThread: return bitc::SYNCHSCOPE_SINGLETHREAD; 139 case CrossThread: return bitc::SYNCHSCOPE_CROSSTHREAD; 140 } 141 llvm_unreachable("Invalid synch scope"); 142} 143 144static void WriteStringRecord(unsigned Code, StringRef Str, 145 unsigned AbbrevToUse, BitstreamWriter &Stream) { 146 SmallVector<unsigned, 64> Vals; 147 148 // Code: [strchar x N] 149 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 150 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i])) 151 AbbrevToUse = 0; 152 Vals.push_back(Str[i]); 153 } 154 155 // Emit the finished record. 156 Stream.EmitRecord(Code, Vals, AbbrevToUse); 157} 158 159static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) { 160 switch (Kind) { 161 case Attribute::Alignment: 162 return bitc::ATTR_KIND_ALIGNMENT; 163 case Attribute::AlwaysInline: 164 return bitc::ATTR_KIND_ALWAYS_INLINE; 165 case Attribute::Builtin: 166 return bitc::ATTR_KIND_BUILTIN; 167 case Attribute::ByVal: 168 return bitc::ATTR_KIND_BY_VAL; 169 case Attribute::InAlloca: 170 return bitc::ATTR_KIND_IN_ALLOCA; 171 case Attribute::Cold: 172 return bitc::ATTR_KIND_COLD; 173 case Attribute::InlineHint: 174 return bitc::ATTR_KIND_INLINE_HINT; 175 case Attribute::InReg: 176 return bitc::ATTR_KIND_IN_REG; 177 case Attribute::JumpTable: 178 return bitc::ATTR_KIND_JUMP_TABLE; 179 case Attribute::MinSize: 180 return bitc::ATTR_KIND_MIN_SIZE; 181 case Attribute::Naked: 182 return bitc::ATTR_KIND_NAKED; 183 case Attribute::Nest: 184 return bitc::ATTR_KIND_NEST; 185 case Attribute::NoAlias: 186 return bitc::ATTR_KIND_NO_ALIAS; 187 case Attribute::NoBuiltin: 188 return bitc::ATTR_KIND_NO_BUILTIN; 189 case Attribute::NoCapture: 190 return bitc::ATTR_KIND_NO_CAPTURE; 191 case Attribute::NoDuplicate: 192 return bitc::ATTR_KIND_NO_DUPLICATE; 193 case Attribute::NoImplicitFloat: 194 return bitc::ATTR_KIND_NO_IMPLICIT_FLOAT; 195 case Attribute::NoInline: 196 return bitc::ATTR_KIND_NO_INLINE; 197 case Attribute::NonLazyBind: 198 return bitc::ATTR_KIND_NON_LAZY_BIND; 199 case Attribute::NonNull: 200 return bitc::ATTR_KIND_NON_NULL; 201 case Attribute::Dereferenceable: 202 return bitc::ATTR_KIND_DEREFERENCEABLE; 203 case Attribute::DereferenceableOrNull: 204 return bitc::ATTR_KIND_DEREFERENCEABLE_OR_NULL; 205 case Attribute::NoRedZone: 206 return bitc::ATTR_KIND_NO_RED_ZONE; 207 case Attribute::NoReturn: 208 return bitc::ATTR_KIND_NO_RETURN; 209 case Attribute::NoUnwind: 210 return bitc::ATTR_KIND_NO_UNWIND; 211 case Attribute::OptimizeForSize: 212 return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE; 213 case Attribute::OptimizeNone: 214 return bitc::ATTR_KIND_OPTIMIZE_NONE; 215 case Attribute::ReadNone: 216 return bitc::ATTR_KIND_READ_NONE; 217 case Attribute::ReadOnly: 218 return bitc::ATTR_KIND_READ_ONLY; 219 case Attribute::Returned: 220 return bitc::ATTR_KIND_RETURNED; 221 case Attribute::ReturnsTwice: 222 return bitc::ATTR_KIND_RETURNS_TWICE; 223 case Attribute::SExt: 224 return bitc::ATTR_KIND_S_EXT; 225 case Attribute::StackAlignment: 226 return bitc::ATTR_KIND_STACK_ALIGNMENT; 227 case Attribute::StackProtect: 228 return bitc::ATTR_KIND_STACK_PROTECT; 229 case Attribute::StackProtectReq: 230 return bitc::ATTR_KIND_STACK_PROTECT_REQ; 231 case Attribute::StackProtectStrong: 232 return bitc::ATTR_KIND_STACK_PROTECT_STRONG; 233 case Attribute::StructRet: 234 return bitc::ATTR_KIND_STRUCT_RET; 235 case Attribute::SanitizeAddress: 236 return bitc::ATTR_KIND_SANITIZE_ADDRESS; 237 case Attribute::SanitizeThread: 238 return bitc::ATTR_KIND_SANITIZE_THREAD; 239 case Attribute::SanitizeMemory: 240 return bitc::ATTR_KIND_SANITIZE_MEMORY; 241 case Attribute::UWTable: 242 return bitc::ATTR_KIND_UW_TABLE; 243 case Attribute::ZExt: 244 return bitc::ATTR_KIND_Z_EXT; 245 case Attribute::EndAttrKinds: 246 llvm_unreachable("Can not encode end-attribute kinds marker."); 247 case Attribute::None: 248 llvm_unreachable("Can not encode none-attribute."); 249 } 250 251 llvm_unreachable("Trying to encode unknown attribute"); 252} 253 254static void WriteAttributeGroupTable(const ValueEnumerator &VE, 255 BitstreamWriter &Stream) { 256 const std::vector<AttributeSet> &AttrGrps = VE.getAttributeGroups(); 257 if (AttrGrps.empty()) return; 258 259 Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3); 260 261 SmallVector<uint64_t, 64> Record; 262 for (unsigned i = 0, e = AttrGrps.size(); i != e; ++i) { 263 AttributeSet AS = AttrGrps[i]; 264 for (unsigned i = 0, e = AS.getNumSlots(); i != e; ++i) { 265 AttributeSet A = AS.getSlotAttributes(i); 266 267 Record.push_back(VE.getAttributeGroupID(A)); 268 Record.push_back(AS.getSlotIndex(i)); 269 270 for (AttributeSet::iterator I = AS.begin(0), E = AS.end(0); 271 I != E; ++I) { 272 Attribute Attr = *I; 273 if (Attr.isEnumAttribute()) { 274 Record.push_back(0); 275 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum())); 276 } else if (Attr.isIntAttribute()) { 277 Record.push_back(1); 278 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum())); 279 Record.push_back(Attr.getValueAsInt()); 280 } else { 281 StringRef Kind = Attr.getKindAsString(); 282 StringRef Val = Attr.getValueAsString(); 283 284 Record.push_back(Val.empty() ? 3 : 4); 285 Record.append(Kind.begin(), Kind.end()); 286 Record.push_back(0); 287 if (!Val.empty()) { 288 Record.append(Val.begin(), Val.end()); 289 Record.push_back(0); 290 } 291 } 292 } 293 294 Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record); 295 Record.clear(); 296 } 297 } 298 299 Stream.ExitBlock(); 300} 301 302static void WriteAttributeTable(const ValueEnumerator &VE, 303 BitstreamWriter &Stream) { 304 const std::vector<AttributeSet> &Attrs = VE.getAttributes(); 305 if (Attrs.empty()) return; 306 307 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 308 309 SmallVector<uint64_t, 64> Record; 310 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 311 const AttributeSet &A = Attrs[i]; 312 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) 313 Record.push_back(VE.getAttributeGroupID(A.getSlotAttributes(i))); 314 315 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 316 Record.clear(); 317 } 318 319 Stream.ExitBlock(); 320} 321 322/// WriteTypeTable - Write out the type table for a module. 323static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) { 324 const ValueEnumerator::TypeList &TypeList = VE.getTypes(); 325 326 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */); 327 SmallVector<uint64_t, 64> TypeVals; 328 329 uint64_t NumBits = VE.computeBitsRequiredForTypeIndicies(); 330 331 // Abbrev for TYPE_CODE_POINTER. 332 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 333 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 334 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 335 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 336 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 337 338 // Abbrev for TYPE_CODE_FUNCTION. 339 Abbv = new BitCodeAbbrev(); 340 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION)); 341 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 342 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 343 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 344 345 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 346 347 // Abbrev for TYPE_CODE_STRUCT_ANON. 348 Abbv = new BitCodeAbbrev(); 349 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON)); 350 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 351 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 352 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 353 354 unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv); 355 356 // Abbrev for TYPE_CODE_STRUCT_NAME. 357 Abbv = new BitCodeAbbrev(); 358 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME)); 359 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 360 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 361 unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv); 362 363 // Abbrev for TYPE_CODE_STRUCT_NAMED. 364 Abbv = new BitCodeAbbrev(); 365 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED)); 366 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 367 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 368 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 369 370 unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv); 371 372 // Abbrev for TYPE_CODE_ARRAY. 373 Abbv = new BitCodeAbbrev(); 374 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 375 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 376 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 377 378 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 379 380 // Emit an entry count so the reader can reserve space. 381 TypeVals.push_back(TypeList.size()); 382 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 383 TypeVals.clear(); 384 385 // Loop over all of the types, emitting each in turn. 386 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 387 Type *T = TypeList[i]; 388 int AbbrevToUse = 0; 389 unsigned Code = 0; 390 391 switch (T->getTypeID()) { 392 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 393 case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; break; 394 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 395 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 396 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 397 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 398 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 399 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 400 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 401 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break; 402 case Type::IntegerTyID: 403 // INTEGER: [width] 404 Code = bitc::TYPE_CODE_INTEGER; 405 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 406 break; 407 case Type::PointerTyID: { 408 PointerType *PTy = cast<PointerType>(T); 409 // POINTER: [pointee type, address space] 410 Code = bitc::TYPE_CODE_POINTER; 411 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 412 unsigned AddressSpace = PTy->getAddressSpace(); 413 TypeVals.push_back(AddressSpace); 414 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 415 break; 416 } 417 case Type::FunctionTyID: { 418 FunctionType *FT = cast<FunctionType>(T); 419 // FUNCTION: [isvararg, retty, paramty x N] 420 Code = bitc::TYPE_CODE_FUNCTION; 421 TypeVals.push_back(FT->isVarArg()); 422 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 423 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 424 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 425 AbbrevToUse = FunctionAbbrev; 426 break; 427 } 428 case Type::StructTyID: { 429 StructType *ST = cast<StructType>(T); 430 // STRUCT: [ispacked, eltty x N] 431 TypeVals.push_back(ST->isPacked()); 432 // Output all of the element types. 433 for (StructType::element_iterator I = ST->element_begin(), 434 E = ST->element_end(); I != E; ++I) 435 TypeVals.push_back(VE.getTypeID(*I)); 436 437 if (ST->isLiteral()) { 438 Code = bitc::TYPE_CODE_STRUCT_ANON; 439 AbbrevToUse = StructAnonAbbrev; 440 } else { 441 if (ST->isOpaque()) { 442 Code = bitc::TYPE_CODE_OPAQUE; 443 } else { 444 Code = bitc::TYPE_CODE_STRUCT_NAMED; 445 AbbrevToUse = StructNamedAbbrev; 446 } 447 448 // Emit the name if it is present. 449 if (!ST->getName().empty()) 450 WriteStringRecord(bitc::TYPE_CODE_STRUCT_NAME, ST->getName(), 451 StructNameAbbrev, Stream); 452 } 453 break; 454 } 455 case Type::ArrayTyID: { 456 ArrayType *AT = cast<ArrayType>(T); 457 // ARRAY: [numelts, eltty] 458 Code = bitc::TYPE_CODE_ARRAY; 459 TypeVals.push_back(AT->getNumElements()); 460 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 461 AbbrevToUse = ArrayAbbrev; 462 break; 463 } 464 case Type::VectorTyID: { 465 VectorType *VT = cast<VectorType>(T); 466 // VECTOR [numelts, eltty] 467 Code = bitc::TYPE_CODE_VECTOR; 468 TypeVals.push_back(VT->getNumElements()); 469 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 470 break; 471 } 472 } 473 474 // Emit the finished record. 475 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 476 TypeVals.clear(); 477 } 478 479 Stream.ExitBlock(); 480} 481 482static unsigned getEncodedLinkage(const GlobalValue &GV) { 483 switch (GV.getLinkage()) { 484 case GlobalValue::ExternalLinkage: 485 return 0; 486 case GlobalValue::WeakAnyLinkage: 487 return 16; 488 case GlobalValue::AppendingLinkage: 489 return 2; 490 case GlobalValue::InternalLinkage: 491 return 3; 492 case GlobalValue::LinkOnceAnyLinkage: 493 return 18; 494 case GlobalValue::ExternalWeakLinkage: 495 return 7; 496 case GlobalValue::CommonLinkage: 497 return 8; 498 case GlobalValue::PrivateLinkage: 499 return 9; 500 case GlobalValue::WeakODRLinkage: 501 return 17; 502 case GlobalValue::LinkOnceODRLinkage: 503 return 19; 504 case GlobalValue::AvailableExternallyLinkage: 505 return 12; 506 } 507 llvm_unreachable("Invalid linkage"); 508} 509 510static unsigned getEncodedVisibility(const GlobalValue &GV) { 511 switch (GV.getVisibility()) { 512 case GlobalValue::DefaultVisibility: return 0; 513 case GlobalValue::HiddenVisibility: return 1; 514 case GlobalValue::ProtectedVisibility: return 2; 515 } 516 llvm_unreachable("Invalid visibility"); 517} 518 519static unsigned getEncodedDLLStorageClass(const GlobalValue &GV) { 520 switch (GV.getDLLStorageClass()) { 521 case GlobalValue::DefaultStorageClass: return 0; 522 case GlobalValue::DLLImportStorageClass: return 1; 523 case GlobalValue::DLLExportStorageClass: return 2; 524 } 525 llvm_unreachable("Invalid DLL storage class"); 526} 527 528static unsigned getEncodedThreadLocalMode(const GlobalValue &GV) { 529 switch (GV.getThreadLocalMode()) { 530 case GlobalVariable::NotThreadLocal: return 0; 531 case GlobalVariable::GeneralDynamicTLSModel: return 1; 532 case GlobalVariable::LocalDynamicTLSModel: return 2; 533 case GlobalVariable::InitialExecTLSModel: return 3; 534 case GlobalVariable::LocalExecTLSModel: return 4; 535 } 536 llvm_unreachable("Invalid TLS model"); 537} 538 539static unsigned getEncodedComdatSelectionKind(const Comdat &C) { 540 switch (C.getSelectionKind()) { 541 case Comdat::Any: 542 return bitc::COMDAT_SELECTION_KIND_ANY; 543 case Comdat::ExactMatch: 544 return bitc::COMDAT_SELECTION_KIND_EXACT_MATCH; 545 case Comdat::Largest: 546 return bitc::COMDAT_SELECTION_KIND_LARGEST; 547 case Comdat::NoDuplicates: 548 return bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES; 549 case Comdat::SameSize: 550 return bitc::COMDAT_SELECTION_KIND_SAME_SIZE; 551 } 552 llvm_unreachable("Invalid selection kind"); 553} 554 555static void writeComdats(const ValueEnumerator &VE, BitstreamWriter &Stream) { 556 SmallVector<uint16_t, 64> Vals; 557 for (const Comdat *C : VE.getComdats()) { 558 // COMDAT: [selection_kind, name] 559 Vals.push_back(getEncodedComdatSelectionKind(*C)); 560 size_t Size = C->getName().size(); 561 assert(isUInt<16>(Size)); 562 Vals.push_back(Size); 563 for (char Chr : C->getName()) 564 Vals.push_back((unsigned char)Chr); 565 Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0); 566 Vals.clear(); 567 } 568} 569 570// Emit top-level description of module, including target triple, inline asm, 571// descriptors for global variables, and function prototype info. 572static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE, 573 BitstreamWriter &Stream) { 574 // Emit various pieces of data attached to a module. 575 if (!M->getTargetTriple().empty()) 576 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 577 0/*TODO*/, Stream); 578 const std::string &DL = M->getDataLayoutStr(); 579 if (!DL.empty()) 580 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/, Stream); 581 if (!M->getModuleInlineAsm().empty()) 582 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 583 0/*TODO*/, Stream); 584 585 // Emit information about sections and GC, computing how many there are. Also 586 // compute the maximum alignment value. 587 std::map<std::string, unsigned> SectionMap; 588 std::map<std::string, unsigned> GCMap; 589 unsigned MaxAlignment = 0; 590 unsigned MaxGlobalType = 0; 591 for (const GlobalValue &GV : M->globals()) { 592 MaxAlignment = std::max(MaxAlignment, GV.getAlignment()); 593 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getType())); 594 if (GV.hasSection()) { 595 // Give section names unique ID's. 596 unsigned &Entry = SectionMap[GV.getSection()]; 597 if (!Entry) { 598 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV.getSection(), 599 0/*TODO*/, Stream); 600 Entry = SectionMap.size(); 601 } 602 } 603 } 604 for (const Function &F : *M) { 605 MaxAlignment = std::max(MaxAlignment, F.getAlignment()); 606 if (F.hasSection()) { 607 // Give section names unique ID's. 608 unsigned &Entry = SectionMap[F.getSection()]; 609 if (!Entry) { 610 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F.getSection(), 611 0/*TODO*/, Stream); 612 Entry = SectionMap.size(); 613 } 614 } 615 if (F.hasGC()) { 616 // Same for GC names. 617 unsigned &Entry = GCMap[F.getGC()]; 618 if (!Entry) { 619 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F.getGC(), 620 0/*TODO*/, Stream); 621 Entry = GCMap.size(); 622 } 623 } 624 } 625 626 // Emit abbrev for globals, now that we know # sections and max alignment. 627 unsigned SimpleGVarAbbrev = 0; 628 if (!M->global_empty()) { 629 // Add an abbrev for common globals with no visibility or thread localness. 630 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 631 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 632 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 633 Log2_32_Ceil(MaxGlobalType+1))); 634 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 635 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 636 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage. 637 if (MaxAlignment == 0) // Alignment. 638 Abbv->Add(BitCodeAbbrevOp(0)); 639 else { 640 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 641 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 642 Log2_32_Ceil(MaxEncAlignment+1))); 643 } 644 if (SectionMap.empty()) // Section. 645 Abbv->Add(BitCodeAbbrevOp(0)); 646 else 647 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 648 Log2_32_Ceil(SectionMap.size()+1))); 649 // Don't bother emitting vis + thread local. 650 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 651 } 652 653 // Emit the global variable information. 654 SmallVector<unsigned, 64> Vals; 655 for (const GlobalVariable &GV : M->globals()) { 656 unsigned AbbrevToUse = 0; 657 658 // GLOBALVAR: [type, isconst, initid, 659 // linkage, alignment, section, visibility, threadlocal, 660 // unnamed_addr, externally_initialized, dllstorageclass, 661 // comdat] 662 Vals.push_back(VE.getTypeID(GV.getType())); 663 Vals.push_back(GV.isConstant()); 664 Vals.push_back(GV.isDeclaration() ? 0 : 665 (VE.getValueID(GV.getInitializer()) + 1)); 666 Vals.push_back(getEncodedLinkage(GV)); 667 Vals.push_back(Log2_32(GV.getAlignment())+1); 668 Vals.push_back(GV.hasSection() ? SectionMap[GV.getSection()] : 0); 669 if (GV.isThreadLocal() || 670 GV.getVisibility() != GlobalValue::DefaultVisibility || 671 GV.hasUnnamedAddr() || GV.isExternallyInitialized() || 672 GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass || 673 GV.hasComdat()) { 674 Vals.push_back(getEncodedVisibility(GV)); 675 Vals.push_back(getEncodedThreadLocalMode(GV)); 676 Vals.push_back(GV.hasUnnamedAddr()); 677 Vals.push_back(GV.isExternallyInitialized()); 678 Vals.push_back(getEncodedDLLStorageClass(GV)); 679 Vals.push_back(GV.hasComdat() ? VE.getComdatID(GV.getComdat()) : 0); 680 } else { 681 AbbrevToUse = SimpleGVarAbbrev; 682 } 683 684 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 685 Vals.clear(); 686 } 687 688 // Emit the function proto information. 689 for (const Function &F : *M) { 690 // FUNCTION: [type, callingconv, isproto, linkage, paramattrs, alignment, 691 // section, visibility, gc, unnamed_addr, prologuedata, 692 // dllstorageclass, comdat, prefixdata] 693 Vals.push_back(VE.getTypeID(F.getType())); 694 Vals.push_back(F.getCallingConv()); 695 Vals.push_back(F.isDeclaration()); 696 Vals.push_back(getEncodedLinkage(F)); 697 Vals.push_back(VE.getAttributeID(F.getAttributes())); 698 Vals.push_back(Log2_32(F.getAlignment())+1); 699 Vals.push_back(F.hasSection() ? SectionMap[F.getSection()] : 0); 700 Vals.push_back(getEncodedVisibility(F)); 701 Vals.push_back(F.hasGC() ? GCMap[F.getGC()] : 0); 702 Vals.push_back(F.hasUnnamedAddr()); 703 Vals.push_back(F.hasPrologueData() ? (VE.getValueID(F.getPrologueData()) + 1) 704 : 0); 705 Vals.push_back(getEncodedDLLStorageClass(F)); 706 Vals.push_back(F.hasComdat() ? VE.getComdatID(F.getComdat()) : 0); 707 Vals.push_back(F.hasPrefixData() ? (VE.getValueID(F.getPrefixData()) + 1) 708 : 0); 709 710 unsigned AbbrevToUse = 0; 711 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 712 Vals.clear(); 713 } 714 715 // Emit the alias information. 716 for (const GlobalAlias &A : M->aliases()) { 717 // ALIAS: [alias type, aliasee val#, linkage, visibility] 718 Vals.push_back(VE.getTypeID(A.getType())); 719 Vals.push_back(VE.getValueID(A.getAliasee())); 720 Vals.push_back(getEncodedLinkage(A)); 721 Vals.push_back(getEncodedVisibility(A)); 722 Vals.push_back(getEncodedDLLStorageClass(A)); 723 Vals.push_back(getEncodedThreadLocalMode(A)); 724 Vals.push_back(A.hasUnnamedAddr()); 725 unsigned AbbrevToUse = 0; 726 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 727 Vals.clear(); 728 } 729} 730 731static uint64_t GetOptimizationFlags(const Value *V) { 732 uint64_t Flags = 0; 733 734 if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) { 735 if (OBO->hasNoSignedWrap()) 736 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 737 if (OBO->hasNoUnsignedWrap()) 738 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 739 } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) { 740 if (PEO->isExact()) 741 Flags |= 1 << bitc::PEO_EXACT; 742 } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) { 743 if (FPMO->hasUnsafeAlgebra()) 744 Flags |= FastMathFlags::UnsafeAlgebra; 745 if (FPMO->hasNoNaNs()) 746 Flags |= FastMathFlags::NoNaNs; 747 if (FPMO->hasNoInfs()) 748 Flags |= FastMathFlags::NoInfs; 749 if (FPMO->hasNoSignedZeros()) 750 Flags |= FastMathFlags::NoSignedZeros; 751 if (FPMO->hasAllowReciprocal()) 752 Flags |= FastMathFlags::AllowReciprocal; 753 } 754 755 return Flags; 756} 757 758static void WriteValueAsMetadata(const ValueAsMetadata *MD, 759 const ValueEnumerator &VE, 760 BitstreamWriter &Stream, 761 SmallVectorImpl<uint64_t> &Record) { 762 // Mimic an MDNode with a value as one operand. 763 Value *V = MD->getValue(); 764 Record.push_back(VE.getTypeID(V->getType())); 765 Record.push_back(VE.getValueID(V)); 766 Stream.EmitRecord(bitc::METADATA_VALUE, Record, 0); 767 Record.clear(); 768} 769 770static void WriteMDTuple(const MDTuple *N, const ValueEnumerator &VE, 771 BitstreamWriter &Stream, 772 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev) { 773 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { 774 Metadata *MD = N->getOperand(i); 775 assert(!(MD && isa<LocalAsMetadata>(MD)) && 776 "Unexpected function-local metadata"); 777 Record.push_back(VE.getMetadataOrNullID(MD)); 778 } 779 Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE 780 : bitc::METADATA_NODE, 781 Record, Abbrev); 782 Record.clear(); 783} 784 785static void WriteMDLocation(const MDLocation *N, const ValueEnumerator &VE, 786 BitstreamWriter &Stream, 787 SmallVectorImpl<uint64_t> &Record, 788 unsigned Abbrev) { 789 Record.push_back(N->isDistinct()); 790 Record.push_back(N->getLine()); 791 Record.push_back(N->getColumn()); 792 Record.push_back(VE.getMetadataID(N->getScope())); 793 Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt())); 794 795 Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev); 796 Record.clear(); 797} 798 799static void WriteGenericDebugNode(const GenericDebugNode *N, 800 const ValueEnumerator &VE, 801 BitstreamWriter &Stream, 802 SmallVectorImpl<uint64_t> &Record, 803 unsigned Abbrev) { 804 Record.push_back(N->isDistinct()); 805 Record.push_back(N->getTag()); 806 Record.push_back(0); // Per-tag version field; unused for now. 807 808 for (auto &I : N->operands()) 809 Record.push_back(VE.getMetadataOrNullID(I)); 810 811 Stream.EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev); 812 Record.clear(); 813} 814 815static uint64_t rotateSign(int64_t I) { 816 uint64_t U = I; 817 return I < 0 ? ~(U << 1) : U << 1; 818} 819 820static void WriteMDSubrange(const MDSubrange *N, const ValueEnumerator &, 821 BitstreamWriter &Stream, 822 SmallVectorImpl<uint64_t> &Record, 823 unsigned Abbrev) { 824 Record.push_back(N->isDistinct()); 825 Record.push_back(N->getCount()); 826 Record.push_back(rotateSign(N->getLowerBound())); 827 828 Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev); 829 Record.clear(); 830} 831 832static void WriteMDEnumerator(const MDEnumerator *N, const ValueEnumerator &VE, 833 BitstreamWriter &Stream, 834 SmallVectorImpl<uint64_t> &Record, 835 unsigned Abbrev) { 836 Record.push_back(N->isDistinct()); 837 Record.push_back(rotateSign(N->getValue())); 838 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 839 840 Stream.EmitRecord(bitc::METADATA_ENUMERATOR, Record, Abbrev); 841 Record.clear(); 842} 843 844static void WriteMDBasicType(const MDBasicType *N, const ValueEnumerator &VE, 845 BitstreamWriter &Stream, 846 SmallVectorImpl<uint64_t> &Record, 847 unsigned Abbrev) { 848 Record.push_back(N->isDistinct()); 849 Record.push_back(N->getTag()); 850 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 851 Record.push_back(N->getSizeInBits()); 852 Record.push_back(N->getAlignInBits()); 853 Record.push_back(N->getEncoding()); 854 855 Stream.EmitRecord(bitc::METADATA_BASIC_TYPE, Record, Abbrev); 856 Record.clear(); 857} 858 859static void WriteMDDerivedType(const MDDerivedType *N, 860 const ValueEnumerator &VE, 861 BitstreamWriter &Stream, 862 SmallVectorImpl<uint64_t> &Record, 863 unsigned Abbrev) { 864 Record.push_back(N->isDistinct()); 865 Record.push_back(N->getTag()); 866 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 867 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 868 Record.push_back(N->getLine()); 869 Record.push_back(VE.getMetadataOrNullID(N->getScope())); 870 Record.push_back(VE.getMetadataOrNullID(N->getBaseType())); 871 Record.push_back(N->getSizeInBits()); 872 Record.push_back(N->getAlignInBits()); 873 Record.push_back(N->getOffsetInBits()); 874 Record.push_back(N->getFlags()); 875 Record.push_back(VE.getMetadataOrNullID(N->getExtraData())); 876 877 Stream.EmitRecord(bitc::METADATA_DERIVED_TYPE, Record, Abbrev); 878 Record.clear(); 879} 880 881static void WriteMDCompositeType(const MDCompositeType *N, 882 const ValueEnumerator &VE, 883 BitstreamWriter &Stream, 884 SmallVectorImpl<uint64_t> &Record, 885 unsigned Abbrev) { 886 Record.push_back(N->isDistinct()); 887 Record.push_back(N->getTag()); 888 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 889 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 890 Record.push_back(N->getLine()); 891 Record.push_back(VE.getMetadataOrNullID(N->getScope())); 892 Record.push_back(VE.getMetadataOrNullID(N->getBaseType())); 893 Record.push_back(N->getSizeInBits()); 894 Record.push_back(N->getAlignInBits()); 895 Record.push_back(N->getOffsetInBits()); 896 Record.push_back(N->getFlags()); 897 Record.push_back(VE.getMetadataOrNullID(N->getElements().get())); 898 Record.push_back(N->getRuntimeLang()); 899 Record.push_back(VE.getMetadataOrNullID(N->getVTableHolder())); 900 Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get())); 901 Record.push_back(VE.getMetadataOrNullID(N->getRawIdentifier())); 902 903 Stream.EmitRecord(bitc::METADATA_COMPOSITE_TYPE, Record, Abbrev); 904 Record.clear(); 905} 906 907static void WriteMDSubroutineType(const MDSubroutineType *N, 908 const ValueEnumerator &VE, 909 BitstreamWriter &Stream, 910 SmallVectorImpl<uint64_t> &Record, 911 unsigned Abbrev) { 912 Record.push_back(N->isDistinct()); 913 Record.push_back(N->getFlags()); 914 Record.push_back(VE.getMetadataOrNullID(N->getTypeArray().get())); 915 916 Stream.EmitRecord(bitc::METADATA_SUBROUTINE_TYPE, Record, Abbrev); 917 Record.clear(); 918} 919 920static void WriteMDFile(const MDFile *N, const ValueEnumerator &VE, 921 BitstreamWriter &Stream, 922 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev) { 923 Record.push_back(N->isDistinct()); 924 Record.push_back(VE.getMetadataOrNullID(N->getRawFilename())); 925 Record.push_back(VE.getMetadataOrNullID(N->getRawDirectory())); 926 927 Stream.EmitRecord(bitc::METADATA_FILE, Record, Abbrev); 928 Record.clear(); 929} 930 931static void WriteMDCompileUnit(const MDCompileUnit *N, 932 const ValueEnumerator &VE, 933 BitstreamWriter &Stream, 934 SmallVectorImpl<uint64_t> &Record, 935 unsigned Abbrev) { 936 Record.push_back(N->isDistinct()); 937 Record.push_back(N->getSourceLanguage()); 938 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 939 Record.push_back(VE.getMetadataOrNullID(N->getRawProducer())); 940 Record.push_back(N->isOptimized()); 941 Record.push_back(VE.getMetadataOrNullID(N->getRawFlags())); 942 Record.push_back(N->getRuntimeVersion()); 943 Record.push_back(VE.getMetadataOrNullID(N->getRawSplitDebugFilename())); 944 Record.push_back(N->getEmissionKind()); 945 Record.push_back(VE.getMetadataOrNullID(N->getEnumTypes().get())); 946 Record.push_back(VE.getMetadataOrNullID(N->getRetainedTypes().get())); 947 Record.push_back(VE.getMetadataOrNullID(N->getSubprograms().get())); 948 Record.push_back(VE.getMetadataOrNullID(N->getGlobalVariables().get())); 949 Record.push_back(VE.getMetadataOrNullID(N->getImportedEntities().get())); 950 951 Stream.EmitRecord(bitc::METADATA_COMPILE_UNIT, Record, Abbrev); 952 Record.clear(); 953} 954 955static void WriteMDSubprogram(const MDSubprogram *N, 956 const ValueEnumerator &VE, 957 BitstreamWriter &Stream, 958 SmallVectorImpl<uint64_t> &Record, 959 unsigned Abbrev) { 960 Record.push_back(N->isDistinct()); 961 Record.push_back(VE.getMetadataOrNullID(N->getScope())); 962 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 963 Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName())); 964 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 965 Record.push_back(N->getLine()); 966 Record.push_back(VE.getMetadataOrNullID(N->getType())); 967 Record.push_back(N->isLocalToUnit()); 968 Record.push_back(N->isDefinition()); 969 Record.push_back(N->getScopeLine()); 970 Record.push_back(VE.getMetadataOrNullID(N->getContainingType())); 971 Record.push_back(N->getVirtuality()); 972 Record.push_back(N->getVirtualIndex()); 973 Record.push_back(N->getFlags()); 974 Record.push_back(N->isOptimized()); 975 Record.push_back(VE.getMetadataOrNullID(N->getRawFunction())); 976 Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get())); 977 Record.push_back(VE.getMetadataOrNullID(N->getDeclaration())); 978 Record.push_back(VE.getMetadataOrNullID(N->getVariables().get())); 979 980 Stream.EmitRecord(bitc::METADATA_SUBPROGRAM, Record, Abbrev); 981 Record.clear(); 982} 983 984static void WriteMDLexicalBlock(const MDLexicalBlock *N, 985 const ValueEnumerator &VE, 986 BitstreamWriter &Stream, 987 SmallVectorImpl<uint64_t> &Record, 988 unsigned Abbrev) { 989 Record.push_back(N->isDistinct()); 990 Record.push_back(VE.getMetadataOrNullID(N->getScope())); 991 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 992 Record.push_back(N->getLine()); 993 Record.push_back(N->getColumn()); 994 995 Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK, Record, Abbrev); 996 Record.clear(); 997} 998 999static void WriteMDLexicalBlockFile(const MDLexicalBlockFile *N, 1000 const ValueEnumerator &VE, 1001 BitstreamWriter &Stream, 1002 SmallVectorImpl<uint64_t> &Record, 1003 unsigned Abbrev) { 1004 Record.push_back(N->isDistinct()); 1005 Record.push_back(VE.getMetadataOrNullID(N->getScope())); 1006 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 1007 Record.push_back(N->getDiscriminator()); 1008 1009 Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK_FILE, Record, Abbrev); 1010 Record.clear(); 1011} 1012 1013static void WriteMDNamespace(const MDNamespace *N, const ValueEnumerator &VE, 1014 BitstreamWriter &Stream, 1015 SmallVectorImpl<uint64_t> &Record, 1016 unsigned Abbrev) { 1017 Record.push_back(N->isDistinct()); 1018 Record.push_back(VE.getMetadataOrNullID(N->getScope())); 1019 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 1020 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 1021 Record.push_back(N->getLine()); 1022 1023 Stream.EmitRecord(bitc::METADATA_NAMESPACE, Record, Abbrev); 1024 Record.clear(); 1025} 1026 1027static void WriteMDTemplateTypeParameter(const MDTemplateTypeParameter *N, 1028 const ValueEnumerator &VE, 1029 BitstreamWriter &Stream, 1030 SmallVectorImpl<uint64_t> &Record, 1031 unsigned Abbrev) { 1032 Record.push_back(N->isDistinct()); 1033 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 1034 Record.push_back(VE.getMetadataOrNullID(N->getType())); 1035 1036 Stream.EmitRecord(bitc::METADATA_TEMPLATE_TYPE, Record, Abbrev); 1037 Record.clear(); 1038} 1039 1040static void WriteMDTemplateValueParameter(const MDTemplateValueParameter *N, 1041 const ValueEnumerator &VE, 1042 BitstreamWriter &Stream, 1043 SmallVectorImpl<uint64_t> &Record, 1044 unsigned Abbrev) { 1045 Record.push_back(N->isDistinct()); 1046 Record.push_back(N->getTag()); 1047 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 1048 Record.push_back(VE.getMetadataOrNullID(N->getType())); 1049 Record.push_back(VE.getMetadataOrNullID(N->getValue())); 1050 1051 Stream.EmitRecord(bitc::METADATA_TEMPLATE_VALUE, Record, Abbrev); 1052 Record.clear(); 1053} 1054 1055static void WriteMDGlobalVariable(const MDGlobalVariable *N, 1056 const ValueEnumerator &VE, 1057 BitstreamWriter &Stream, 1058 SmallVectorImpl<uint64_t> &Record, 1059 unsigned Abbrev) { 1060 Record.push_back(N->isDistinct()); 1061 Record.push_back(VE.getMetadataOrNullID(N->getScope())); 1062 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 1063 Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName())); 1064 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 1065 Record.push_back(N->getLine()); 1066 Record.push_back(VE.getMetadataOrNullID(N->getType())); 1067 Record.push_back(N->isLocalToUnit()); 1068 Record.push_back(N->isDefinition()); 1069 Record.push_back(VE.getMetadataOrNullID(N->getRawVariable())); 1070 Record.push_back(VE.getMetadataOrNullID(N->getStaticDataMemberDeclaration())); 1071 1072 Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR, Record, Abbrev); 1073 Record.clear(); 1074} 1075 1076static void WriteMDLocalVariable(const MDLocalVariable *N, 1077 const ValueEnumerator &VE, 1078 BitstreamWriter &Stream, 1079 SmallVectorImpl<uint64_t> &Record, 1080 unsigned Abbrev) { 1081 Record.push_back(N->isDistinct()); 1082 Record.push_back(N->getTag()); 1083 Record.push_back(VE.getMetadataOrNullID(N->getScope())); 1084 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 1085 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 1086 Record.push_back(N->getLine()); 1087 Record.push_back(VE.getMetadataOrNullID(N->getType())); 1088 Record.push_back(N->getArg()); 1089 Record.push_back(N->getFlags()); 1090 1091 Stream.EmitRecord(bitc::METADATA_LOCAL_VAR, Record, Abbrev); 1092 Record.clear(); 1093} 1094 1095static void WriteMDExpression(const MDExpression *N, const ValueEnumerator &, 1096 BitstreamWriter &Stream, 1097 SmallVectorImpl<uint64_t> &Record, 1098 unsigned Abbrev) { 1099 Record.reserve(N->getElements().size() + 1); 1100 1101 Record.push_back(N->isDistinct()); 1102 Record.append(N->elements_begin(), N->elements_end()); 1103 1104 Stream.EmitRecord(bitc::METADATA_EXPRESSION, Record, Abbrev); 1105 Record.clear(); 1106} 1107 1108static void WriteMDObjCProperty(const MDObjCProperty *N, 1109 const ValueEnumerator &VE, 1110 BitstreamWriter &Stream, 1111 SmallVectorImpl<uint64_t> &Record, 1112 unsigned Abbrev) { 1113 Record.push_back(N->isDistinct()); 1114 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 1115 Record.push_back(VE.getMetadataOrNullID(N->getFile())); 1116 Record.push_back(N->getLine()); 1117 Record.push_back(VE.getMetadataOrNullID(N->getRawSetterName())); 1118 Record.push_back(VE.getMetadataOrNullID(N->getRawGetterName())); 1119 Record.push_back(N->getAttributes()); 1120 Record.push_back(VE.getMetadataOrNullID(N->getType())); 1121 1122 Stream.EmitRecord(bitc::METADATA_OBJC_PROPERTY, Record, Abbrev); 1123 Record.clear(); 1124} 1125 1126static void WriteMDImportedEntity(const MDImportedEntity *N, 1127 const ValueEnumerator &VE, 1128 BitstreamWriter &Stream, 1129 SmallVectorImpl<uint64_t> &Record, 1130 unsigned Abbrev) { 1131 Record.push_back(N->isDistinct()); 1132 Record.push_back(N->getTag()); 1133 Record.push_back(VE.getMetadataOrNullID(N->getScope())); 1134 Record.push_back(VE.getMetadataOrNullID(N->getEntity())); 1135 Record.push_back(N->getLine()); 1136 Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 1137 1138 Stream.EmitRecord(bitc::METADATA_IMPORTED_ENTITY, Record, Abbrev); 1139 Record.clear(); 1140} 1141 1142static void WriteModuleMetadata(const Module *M, 1143 const ValueEnumerator &VE, 1144 BitstreamWriter &Stream) { 1145 const auto &MDs = VE.getMDs(); 1146 if (MDs.empty() && M->named_metadata_empty()) 1147 return; 1148 1149 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 1150 1151 unsigned MDSAbbrev = 0; 1152 if (VE.hasMDString()) { 1153 // Abbrev for METADATA_STRING. 1154 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1155 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 1156 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1157 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1158 MDSAbbrev = Stream.EmitAbbrev(Abbv); 1159 } 1160 1161 // Initialize MDNode abbreviations. 1162#define HANDLE_MDNODE_LEAF(CLASS) unsigned CLASS##Abbrev = 0; 1163#include "llvm/IR/Metadata.def" 1164 1165 if (VE.hasMDLocation()) { 1166 // Abbrev for METADATA_LOCATION. 1167 // 1168 // Assume the column is usually under 128, and always output the inlined-at 1169 // location (it's never more expensive than building an array size 1). 1170 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1171 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_LOCATION)); 1172 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 1173 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 1174 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1175 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 1176 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 1177 MDLocationAbbrev = Stream.EmitAbbrev(Abbv); 1178 } 1179 1180 if (VE.hasGenericDebugNode()) { 1181 // Abbrev for METADATA_GENERIC_DEBUG. 1182 // 1183 // Assume the column is usually under 128, and always output the inlined-at 1184 // location (it's never more expensive than building an array size 1). 1185 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1186 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_GENERIC_DEBUG)); 1187 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 1188 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 1189 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 1190 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 1191 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1192 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 1193 GenericDebugNodeAbbrev = Stream.EmitAbbrev(Abbv); 1194 } 1195 1196 unsigned NameAbbrev = 0; 1197 if (!M->named_metadata_empty()) { 1198 // Abbrev for METADATA_NAME. 1199 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1200 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_NAME)); 1201 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1202 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1203 NameAbbrev = Stream.EmitAbbrev(Abbv); 1204 } 1205 1206 SmallVector<uint64_t, 64> Record; 1207 for (const Metadata *MD : MDs) { 1208 if (const MDNode *N = dyn_cast<MDNode>(MD)) { 1209 assert(N->isResolved() && "Expected forward references to be resolved"); 1210 1211 switch (N->getMetadataID()) { 1212 default: 1213 llvm_unreachable("Invalid MDNode subclass"); 1214#define HANDLE_MDNODE_LEAF(CLASS) \ 1215 case Metadata::CLASS##Kind: \ 1216 Write##CLASS(cast<CLASS>(N), VE, Stream, Record, CLASS##Abbrev); \ 1217 continue; 1218#include "llvm/IR/Metadata.def" 1219 } 1220 } 1221 if (const auto *MDC = dyn_cast<ConstantAsMetadata>(MD)) { 1222 WriteValueAsMetadata(MDC, VE, Stream, Record); 1223 continue; 1224 } 1225 const MDString *MDS = cast<MDString>(MD); 1226 // Code: [strchar x N] 1227 Record.append(MDS->bytes_begin(), MDS->bytes_end()); 1228 1229 // Emit the finished record. 1230 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 1231 Record.clear(); 1232 } 1233 1234 // Write named metadata. 1235 for (const NamedMDNode &NMD : M->named_metadata()) { 1236 // Write name. 1237 StringRef Str = NMD.getName(); 1238 Record.append(Str.bytes_begin(), Str.bytes_end()); 1239 Stream.EmitRecord(bitc::METADATA_NAME, Record, NameAbbrev); 1240 Record.clear(); 1241 1242 // Write named metadata operands. 1243 for (const MDNode *N : NMD.operands()) 1244 Record.push_back(VE.getMetadataID(N)); 1245 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0); 1246 Record.clear(); 1247 } 1248 1249 Stream.ExitBlock(); 1250} 1251 1252static void WriteFunctionLocalMetadata(const Function &F, 1253 const ValueEnumerator &VE, 1254 BitstreamWriter &Stream) { 1255 bool StartedMetadataBlock = false; 1256 SmallVector<uint64_t, 64> Record; 1257 const SmallVectorImpl<const LocalAsMetadata *> &MDs = 1258 VE.getFunctionLocalMDs(); 1259 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 1260 assert(MDs[i] && "Expected valid function-local metadata"); 1261 if (!StartedMetadataBlock) { 1262 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 1263 StartedMetadataBlock = true; 1264 } 1265 WriteValueAsMetadata(MDs[i], VE, Stream, Record); 1266 } 1267 1268 if (StartedMetadataBlock) 1269 Stream.ExitBlock(); 1270} 1271 1272static void WriteMetadataAttachment(const Function &F, 1273 const ValueEnumerator &VE, 1274 BitstreamWriter &Stream) { 1275 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 1276 1277 SmallVector<uint64_t, 64> Record; 1278 1279 // Write metadata attachments 1280 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 1281 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs; 1282 1283 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1284 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1285 I != E; ++I) { 1286 MDs.clear(); 1287 I->getAllMetadataOtherThanDebugLoc(MDs); 1288 1289 // If no metadata, ignore instruction. 1290 if (MDs.empty()) continue; 1291 1292 Record.push_back(VE.getInstructionID(I)); 1293 1294 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 1295 Record.push_back(MDs[i].first); 1296 Record.push_back(VE.getMetadataID(MDs[i].second)); 1297 } 1298 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0); 1299 Record.clear(); 1300 } 1301 1302 Stream.ExitBlock(); 1303} 1304 1305static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) { 1306 SmallVector<uint64_t, 64> Record; 1307 1308 // Write metadata kinds 1309 // METADATA_KIND - [n x [id, name]] 1310 SmallVector<StringRef, 8> Names; 1311 M->getMDKindNames(Names); 1312 1313 if (Names.empty()) return; 1314 1315 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 1316 1317 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) { 1318 Record.push_back(MDKindID); 1319 StringRef KName = Names[MDKindID]; 1320 Record.append(KName.begin(), KName.end()); 1321 1322 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 1323 Record.clear(); 1324 } 1325 1326 Stream.ExitBlock(); 1327} 1328 1329static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) { 1330 if ((int64_t)V >= 0) 1331 Vals.push_back(V << 1); 1332 else 1333 Vals.push_back((-V << 1) | 1); 1334} 1335 1336static void WriteConstants(unsigned FirstVal, unsigned LastVal, 1337 const ValueEnumerator &VE, 1338 BitstreamWriter &Stream, bool isGlobal) { 1339 if (FirstVal == LastVal) return; 1340 1341 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 1342 1343 unsigned AggregateAbbrev = 0; 1344 unsigned String8Abbrev = 0; 1345 unsigned CString7Abbrev = 0; 1346 unsigned CString6Abbrev = 0; 1347 // If this is a constant pool for the module, emit module-specific abbrevs. 1348 if (isGlobal) { 1349 // Abbrev for CST_CODE_AGGREGATE. 1350 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1351 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 1352 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1353 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 1354 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 1355 1356 // Abbrev for CST_CODE_STRING. 1357 Abbv = new BitCodeAbbrev(); 1358 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 1359 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1360 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1361 String8Abbrev = Stream.EmitAbbrev(Abbv); 1362 // Abbrev for CST_CODE_CSTRING. 1363 Abbv = new BitCodeAbbrev(); 1364 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 1365 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1366 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1367 CString7Abbrev = Stream.EmitAbbrev(Abbv); 1368 // Abbrev for CST_CODE_CSTRING. 1369 Abbv = new BitCodeAbbrev(); 1370 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 1371 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1372 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1373 CString6Abbrev = Stream.EmitAbbrev(Abbv); 1374 } 1375 1376 SmallVector<uint64_t, 64> Record; 1377 1378 const ValueEnumerator::ValueList &Vals = VE.getValues(); 1379 Type *LastTy = nullptr; 1380 for (unsigned i = FirstVal; i != LastVal; ++i) { 1381 const Value *V = Vals[i].first; 1382 // If we need to switch types, do so now. 1383 if (V->getType() != LastTy) { 1384 LastTy = V->getType(); 1385 Record.push_back(VE.getTypeID(LastTy)); 1386 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 1387 CONSTANTS_SETTYPE_ABBREV); 1388 Record.clear(); 1389 } 1390 1391 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 1392 Record.push_back(unsigned(IA->hasSideEffects()) | 1393 unsigned(IA->isAlignStack()) << 1 | 1394 unsigned(IA->getDialect()&1) << 2); 1395 1396 // Add the asm string. 1397 const std::string &AsmStr = IA->getAsmString(); 1398 Record.push_back(AsmStr.size()); 1399 Record.append(AsmStr.begin(), AsmStr.end()); 1400 1401 // Add the constraint string. 1402 const std::string &ConstraintStr = IA->getConstraintString(); 1403 Record.push_back(ConstraintStr.size()); 1404 Record.append(ConstraintStr.begin(), ConstraintStr.end()); 1405 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 1406 Record.clear(); 1407 continue; 1408 } 1409 const Constant *C = cast<Constant>(V); 1410 unsigned Code = -1U; 1411 unsigned AbbrevToUse = 0; 1412 if (C->isNullValue()) { 1413 Code = bitc::CST_CODE_NULL; 1414 } else if (isa<UndefValue>(C)) { 1415 Code = bitc::CST_CODE_UNDEF; 1416 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 1417 if (IV->getBitWidth() <= 64) { 1418 uint64_t V = IV->getSExtValue(); 1419 emitSignedInt64(Record, V); 1420 Code = bitc::CST_CODE_INTEGER; 1421 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 1422 } else { // Wide integers, > 64 bits in size. 1423 // We have an arbitrary precision integer value to write whose 1424 // bit width is > 64. However, in canonical unsigned integer 1425 // format it is likely that the high bits are going to be zero. 1426 // So, we only write the number of active words. 1427 unsigned NWords = IV->getValue().getActiveWords(); 1428 const uint64_t *RawWords = IV->getValue().getRawData(); 1429 for (unsigned i = 0; i != NWords; ++i) { 1430 emitSignedInt64(Record, RawWords[i]); 1431 } 1432 Code = bitc::CST_CODE_WIDE_INTEGER; 1433 } 1434 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 1435 Code = bitc::CST_CODE_FLOAT; 1436 Type *Ty = CFP->getType(); 1437 if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) { 1438 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 1439 } else if (Ty->isX86_FP80Ty()) { 1440 // api needed to prevent premature destruction 1441 // bits are not in the same order as a normal i80 APInt, compensate. 1442 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1443 const uint64_t *p = api.getRawData(); 1444 Record.push_back((p[1] << 48) | (p[0] >> 16)); 1445 Record.push_back(p[0] & 0xffffLL); 1446 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 1447 APInt api = CFP->getValueAPF().bitcastToAPInt(); 1448 const uint64_t *p = api.getRawData(); 1449 Record.push_back(p[0]); 1450 Record.push_back(p[1]); 1451 } else { 1452 assert (0 && "Unknown FP type!"); 1453 } 1454 } else if (isa<ConstantDataSequential>(C) && 1455 cast<ConstantDataSequential>(C)->isString()) { 1456 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C); 1457 // Emit constant strings specially. 1458 unsigned NumElts = Str->getNumElements(); 1459 // If this is a null-terminated string, use the denser CSTRING encoding. 1460 if (Str->isCString()) { 1461 Code = bitc::CST_CODE_CSTRING; 1462 --NumElts; // Don't encode the null, which isn't allowed by char6. 1463 } else { 1464 Code = bitc::CST_CODE_STRING; 1465 AbbrevToUse = String8Abbrev; 1466 } 1467 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 1468 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 1469 for (unsigned i = 0; i != NumElts; ++i) { 1470 unsigned char V = Str->getElementAsInteger(i); 1471 Record.push_back(V); 1472 isCStr7 &= (V & 128) == 0; 1473 if (isCStrChar6) 1474 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 1475 } 1476 1477 if (isCStrChar6) 1478 AbbrevToUse = CString6Abbrev; 1479 else if (isCStr7) 1480 AbbrevToUse = CString7Abbrev; 1481 } else if (const ConstantDataSequential *CDS = 1482 dyn_cast<ConstantDataSequential>(C)) { 1483 Code = bitc::CST_CODE_DATA; 1484 Type *EltTy = CDS->getType()->getElementType(); 1485 if (isa<IntegerType>(EltTy)) { 1486 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) 1487 Record.push_back(CDS->getElementAsInteger(i)); 1488 } else if (EltTy->isFloatTy()) { 1489 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 1490 union { float F; uint32_t I; }; 1491 F = CDS->getElementAsFloat(i); 1492 Record.push_back(I); 1493 } 1494 } else { 1495 assert(EltTy->isDoubleTy() && "Unknown ConstantData element type"); 1496 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 1497 union { double F; uint64_t I; }; 1498 F = CDS->getElementAsDouble(i); 1499 Record.push_back(I); 1500 } 1501 } 1502 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) || 1503 isa<ConstantVector>(C)) { 1504 Code = bitc::CST_CODE_AGGREGATE; 1505 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 1506 Record.push_back(VE.getValueID(C->getOperand(i))); 1507 AbbrevToUse = AggregateAbbrev; 1508 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 1509 switch (CE->getOpcode()) { 1510 default: 1511 if (Instruction::isCast(CE->getOpcode())) { 1512 Code = bitc::CST_CODE_CE_CAST; 1513 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 1514 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1515 Record.push_back(VE.getValueID(C->getOperand(0))); 1516 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 1517 } else { 1518 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 1519 Code = bitc::CST_CODE_CE_BINOP; 1520 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 1521 Record.push_back(VE.getValueID(C->getOperand(0))); 1522 Record.push_back(VE.getValueID(C->getOperand(1))); 1523 uint64_t Flags = GetOptimizationFlags(CE); 1524 if (Flags != 0) 1525 Record.push_back(Flags); 1526 } 1527 break; 1528 case Instruction::GetElementPtr: { 1529 Code = bitc::CST_CODE_CE_GEP; 1530 const auto *GO = cast<GEPOperator>(C); 1531 if (GO->isInBounds()) 1532 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 1533 Record.push_back(VE.getTypeID(GO->getSourceElementType())); 1534 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 1535 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 1536 Record.push_back(VE.getValueID(C->getOperand(i))); 1537 } 1538 break; 1539 } 1540 case Instruction::Select: 1541 Code = bitc::CST_CODE_CE_SELECT; 1542 Record.push_back(VE.getValueID(C->getOperand(0))); 1543 Record.push_back(VE.getValueID(C->getOperand(1))); 1544 Record.push_back(VE.getValueID(C->getOperand(2))); 1545 break; 1546 case Instruction::ExtractElement: 1547 Code = bitc::CST_CODE_CE_EXTRACTELT; 1548 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1549 Record.push_back(VE.getValueID(C->getOperand(0))); 1550 Record.push_back(VE.getTypeID(C->getOperand(1)->getType())); 1551 Record.push_back(VE.getValueID(C->getOperand(1))); 1552 break; 1553 case Instruction::InsertElement: 1554 Code = bitc::CST_CODE_CE_INSERTELT; 1555 Record.push_back(VE.getValueID(C->getOperand(0))); 1556 Record.push_back(VE.getValueID(C->getOperand(1))); 1557 Record.push_back(VE.getTypeID(C->getOperand(2)->getType())); 1558 Record.push_back(VE.getValueID(C->getOperand(2))); 1559 break; 1560 case Instruction::ShuffleVector: 1561 // If the return type and argument types are the same, this is a 1562 // standard shufflevector instruction. If the types are different, 1563 // then the shuffle is widening or truncating the input vectors, and 1564 // the argument type must also be encoded. 1565 if (C->getType() == C->getOperand(0)->getType()) { 1566 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 1567 } else { 1568 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 1569 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1570 } 1571 Record.push_back(VE.getValueID(C->getOperand(0))); 1572 Record.push_back(VE.getValueID(C->getOperand(1))); 1573 Record.push_back(VE.getValueID(C->getOperand(2))); 1574 break; 1575 case Instruction::ICmp: 1576 case Instruction::FCmp: 1577 Code = bitc::CST_CODE_CE_CMP; 1578 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1579 Record.push_back(VE.getValueID(C->getOperand(0))); 1580 Record.push_back(VE.getValueID(C->getOperand(1))); 1581 Record.push_back(CE->getPredicate()); 1582 break; 1583 } 1584 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) { 1585 Code = bitc::CST_CODE_BLOCKADDRESS; 1586 Record.push_back(VE.getTypeID(BA->getFunction()->getType())); 1587 Record.push_back(VE.getValueID(BA->getFunction())); 1588 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock())); 1589 } else { 1590#ifndef NDEBUG 1591 C->dump(); 1592#endif 1593 llvm_unreachable("Unknown constant!"); 1594 } 1595 Stream.EmitRecord(Code, Record, AbbrevToUse); 1596 Record.clear(); 1597 } 1598 1599 Stream.ExitBlock(); 1600} 1601 1602static void WriteModuleConstants(const ValueEnumerator &VE, 1603 BitstreamWriter &Stream) { 1604 const ValueEnumerator::ValueList &Vals = VE.getValues(); 1605 1606 // Find the first constant to emit, which is the first non-globalvalue value. 1607 // We know globalvalues have been emitted by WriteModuleInfo. 1608 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 1609 if (!isa<GlobalValue>(Vals[i].first)) { 1610 WriteConstants(i, Vals.size(), VE, Stream, true); 1611 return; 1612 } 1613 } 1614} 1615 1616/// PushValueAndType - The file has to encode both the value and type id for 1617/// many values, because we need to know what type to create for forward 1618/// references. However, most operands are not forward references, so this type 1619/// field is not needed. 1620/// 1621/// This function adds V's value ID to Vals. If the value ID is higher than the 1622/// instruction ID, then it is a forward reference, and it also includes the 1623/// type ID. The value ID that is written is encoded relative to the InstID. 1624static bool PushValueAndType(const Value *V, unsigned InstID, 1625 SmallVectorImpl<unsigned> &Vals, 1626 ValueEnumerator &VE) { 1627 unsigned ValID = VE.getValueID(V); 1628 // Make encoding relative to the InstID. 1629 Vals.push_back(InstID - ValID); 1630 if (ValID >= InstID) { 1631 Vals.push_back(VE.getTypeID(V->getType())); 1632 return true; 1633 } 1634 return false; 1635} 1636 1637/// pushValue - Like PushValueAndType, but where the type of the value is 1638/// omitted (perhaps it was already encoded in an earlier operand). 1639static void pushValue(const Value *V, unsigned InstID, 1640 SmallVectorImpl<unsigned> &Vals, 1641 ValueEnumerator &VE) { 1642 unsigned ValID = VE.getValueID(V); 1643 Vals.push_back(InstID - ValID); 1644} 1645 1646static void pushValueSigned(const Value *V, unsigned InstID, 1647 SmallVectorImpl<uint64_t> &Vals, 1648 ValueEnumerator &VE) { 1649 unsigned ValID = VE.getValueID(V); 1650 int64_t diff = ((int32_t)InstID - (int32_t)ValID); 1651 emitSignedInt64(Vals, diff); 1652} 1653 1654/// WriteInstruction - Emit an instruction to the specified stream. 1655static void WriteInstruction(const Instruction &I, unsigned InstID, 1656 ValueEnumerator &VE, BitstreamWriter &Stream, 1657 SmallVectorImpl<unsigned> &Vals) { 1658 unsigned Code = 0; 1659 unsigned AbbrevToUse = 0; 1660 VE.setInstructionID(&I); 1661 switch (I.getOpcode()) { 1662 default: 1663 if (Instruction::isCast(I.getOpcode())) { 1664 Code = bitc::FUNC_CODE_INST_CAST; 1665 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1666 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 1667 Vals.push_back(VE.getTypeID(I.getType())); 1668 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 1669 } else { 1670 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 1671 Code = bitc::FUNC_CODE_INST_BINOP; 1672 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1673 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 1674 pushValue(I.getOperand(1), InstID, Vals, VE); 1675 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 1676 uint64_t Flags = GetOptimizationFlags(&I); 1677 if (Flags != 0) { 1678 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 1679 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 1680 Vals.push_back(Flags); 1681 } 1682 } 1683 break; 1684 1685 case Instruction::GetElementPtr: { 1686 Code = bitc::FUNC_CODE_INST_GEP; 1687 AbbrevToUse = FUNCTION_INST_GEP_ABBREV; 1688 auto &GEPInst = cast<GetElementPtrInst>(I); 1689 Vals.push_back(GEPInst.isInBounds()); 1690 Vals.push_back(VE.getTypeID(GEPInst.getSourceElementType())); 1691 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1692 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1693 break; 1694 } 1695 case Instruction::ExtractValue: { 1696 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 1697 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1698 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 1699 Vals.append(EVI->idx_begin(), EVI->idx_end()); 1700 break; 1701 } 1702 case Instruction::InsertValue: { 1703 Code = bitc::FUNC_CODE_INST_INSERTVAL; 1704 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1705 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1706 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 1707 Vals.append(IVI->idx_begin(), IVI->idx_end()); 1708 break; 1709 } 1710 case Instruction::Select: 1711 Code = bitc::FUNC_CODE_INST_VSELECT; 1712 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1713 pushValue(I.getOperand(2), InstID, Vals, VE); 1714 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1715 break; 1716 case Instruction::ExtractElement: 1717 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 1718 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1719 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1720 break; 1721 case Instruction::InsertElement: 1722 Code = bitc::FUNC_CODE_INST_INSERTELT; 1723 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1724 pushValue(I.getOperand(1), InstID, Vals, VE); 1725 PushValueAndType(I.getOperand(2), InstID, Vals, VE); 1726 break; 1727 case Instruction::ShuffleVector: 1728 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 1729 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1730 pushValue(I.getOperand(1), InstID, Vals, VE); 1731 pushValue(I.getOperand(2), InstID, Vals, VE); 1732 break; 1733 case Instruction::ICmp: 1734 case Instruction::FCmp: 1735 // compare returning Int1Ty or vector of Int1Ty 1736 Code = bitc::FUNC_CODE_INST_CMP2; 1737 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1738 pushValue(I.getOperand(1), InstID, Vals, VE); 1739 Vals.push_back(cast<CmpInst>(I).getPredicate()); 1740 break; 1741 1742 case Instruction::Ret: 1743 { 1744 Code = bitc::FUNC_CODE_INST_RET; 1745 unsigned NumOperands = I.getNumOperands(); 1746 if (NumOperands == 0) 1747 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 1748 else if (NumOperands == 1) { 1749 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1750 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 1751 } else { 1752 for (unsigned i = 0, e = NumOperands; i != e; ++i) 1753 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1754 } 1755 } 1756 break; 1757 case Instruction::Br: 1758 { 1759 Code = bitc::FUNC_CODE_INST_BR; 1760 const BranchInst &II = cast<BranchInst>(I); 1761 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 1762 if (II.isConditional()) { 1763 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 1764 pushValue(II.getCondition(), InstID, Vals, VE); 1765 } 1766 } 1767 break; 1768 case Instruction::Switch: 1769 { 1770 Code = bitc::FUNC_CODE_INST_SWITCH; 1771 const SwitchInst &SI = cast<SwitchInst>(I); 1772 Vals.push_back(VE.getTypeID(SI.getCondition()->getType())); 1773 pushValue(SI.getCondition(), InstID, Vals, VE); 1774 Vals.push_back(VE.getValueID(SI.getDefaultDest())); 1775 for (SwitchInst::ConstCaseIt i = SI.case_begin(), e = SI.case_end(); 1776 i != e; ++i) { 1777 Vals.push_back(VE.getValueID(i.getCaseValue())); 1778 Vals.push_back(VE.getValueID(i.getCaseSuccessor())); 1779 } 1780 } 1781 break; 1782 case Instruction::IndirectBr: 1783 Code = bitc::FUNC_CODE_INST_INDIRECTBR; 1784 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1785 // Encode the address operand as relative, but not the basic blocks. 1786 pushValue(I.getOperand(0), InstID, Vals, VE); 1787 for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) 1788 Vals.push_back(VE.getValueID(I.getOperand(i))); 1789 break; 1790 1791 case Instruction::Invoke: { 1792 const InvokeInst *II = cast<InvokeInst>(&I); 1793 const Value *Callee(II->getCalledValue()); 1794 PointerType *PTy = cast<PointerType>(Callee->getType()); 1795 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1796 Code = bitc::FUNC_CODE_INST_INVOKE; 1797 1798 Vals.push_back(VE.getAttributeID(II->getAttributes())); 1799 Vals.push_back(II->getCallingConv()); 1800 Vals.push_back(VE.getValueID(II->getNormalDest())); 1801 Vals.push_back(VE.getValueID(II->getUnwindDest())); 1802 PushValueAndType(Callee, InstID, Vals, VE); 1803 1804 // Emit value #'s for the fixed parameters. 1805 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1806 pushValue(I.getOperand(i), InstID, Vals, VE); // fixed param. 1807 1808 // Emit type/value pairs for varargs params. 1809 if (FTy->isVarArg()) { 1810 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3; 1811 i != e; ++i) 1812 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 1813 } 1814 break; 1815 } 1816 case Instruction::Resume: 1817 Code = bitc::FUNC_CODE_INST_RESUME; 1818 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1819 break; 1820 case Instruction::Unreachable: 1821 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 1822 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 1823 break; 1824 1825 case Instruction::PHI: { 1826 const PHINode &PN = cast<PHINode>(I); 1827 Code = bitc::FUNC_CODE_INST_PHI; 1828 // With the newer instruction encoding, forward references could give 1829 // negative valued IDs. This is most common for PHIs, so we use 1830 // signed VBRs. 1831 SmallVector<uint64_t, 128> Vals64; 1832 Vals64.push_back(VE.getTypeID(PN.getType())); 1833 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { 1834 pushValueSigned(PN.getIncomingValue(i), InstID, Vals64, VE); 1835 Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i))); 1836 } 1837 // Emit a Vals64 vector and exit. 1838 Stream.EmitRecord(Code, Vals64, AbbrevToUse); 1839 Vals64.clear(); 1840 return; 1841 } 1842 1843 case Instruction::LandingPad: { 1844 const LandingPadInst &LP = cast<LandingPadInst>(I); 1845 Code = bitc::FUNC_CODE_INST_LANDINGPAD; 1846 Vals.push_back(VE.getTypeID(LP.getType())); 1847 PushValueAndType(LP.getPersonalityFn(), InstID, Vals, VE); 1848 Vals.push_back(LP.isCleanup()); 1849 Vals.push_back(LP.getNumClauses()); 1850 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) { 1851 if (LP.isCatch(I)) 1852 Vals.push_back(LandingPadInst::Catch); 1853 else 1854 Vals.push_back(LandingPadInst::Filter); 1855 PushValueAndType(LP.getClause(I), InstID, Vals, VE); 1856 } 1857 break; 1858 } 1859 1860 case Instruction::Alloca: { 1861 Code = bitc::FUNC_CODE_INST_ALLOCA; 1862 Vals.push_back(VE.getTypeID(I.getType())); 1863 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1864 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1865 const AllocaInst &AI = cast<AllocaInst>(I); 1866 unsigned AlignRecord = Log2_32(AI.getAlignment()) + 1; 1867 assert(Log2_32(Value::MaximumAlignment) + 1 < 1 << 5 && 1868 "not enough bits for maximum alignment"); 1869 assert(AlignRecord < 1 << 5 && "alignment greater than 1 << 64"); 1870 AlignRecord |= AI.isUsedWithInAlloca() << 5; 1871 Vals.push_back(AlignRecord); 1872 break; 1873 } 1874 1875 case Instruction::Load: 1876 if (cast<LoadInst>(I).isAtomic()) { 1877 Code = bitc::FUNC_CODE_INST_LOADATOMIC; 1878 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1879 } else { 1880 Code = bitc::FUNC_CODE_INST_LOAD; 1881 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1882 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1883 } 1884 Vals.push_back(VE.getTypeID(I.getType())); 1885 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1886 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1887 if (cast<LoadInst>(I).isAtomic()) { 1888 Vals.push_back(GetEncodedOrdering(cast<LoadInst>(I).getOrdering())); 1889 Vals.push_back(GetEncodedSynchScope(cast<LoadInst>(I).getSynchScope())); 1890 } 1891 break; 1892 case Instruction::Store: 1893 if (cast<StoreInst>(I).isAtomic()) 1894 Code = bitc::FUNC_CODE_INST_STOREATOMIC; 1895 else 1896 Code = bitc::FUNC_CODE_INST_STORE; 1897 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1898 pushValue(I.getOperand(0), InstID, Vals, VE); // val. 1899 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1900 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1901 if (cast<StoreInst>(I).isAtomic()) { 1902 Vals.push_back(GetEncodedOrdering(cast<StoreInst>(I).getOrdering())); 1903 Vals.push_back(GetEncodedSynchScope(cast<StoreInst>(I).getSynchScope())); 1904 } 1905 break; 1906 case Instruction::AtomicCmpXchg: 1907 Code = bitc::FUNC_CODE_INST_CMPXCHG; 1908 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1909 pushValue(I.getOperand(1), InstID, Vals, VE); // cmp. 1910 pushValue(I.getOperand(2), InstID, Vals, VE); // newval. 1911 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile()); 1912 Vals.push_back(GetEncodedOrdering( 1913 cast<AtomicCmpXchgInst>(I).getSuccessOrdering())); 1914 Vals.push_back(GetEncodedSynchScope( 1915 cast<AtomicCmpXchgInst>(I).getSynchScope())); 1916 Vals.push_back(GetEncodedOrdering( 1917 cast<AtomicCmpXchgInst>(I).getFailureOrdering())); 1918 Vals.push_back(cast<AtomicCmpXchgInst>(I).isWeak()); 1919 break; 1920 case Instruction::AtomicRMW: 1921 Code = bitc::FUNC_CODE_INST_ATOMICRMW; 1922 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1923 pushValue(I.getOperand(1), InstID, Vals, VE); // val. 1924 Vals.push_back(GetEncodedRMWOperation( 1925 cast<AtomicRMWInst>(I).getOperation())); 1926 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile()); 1927 Vals.push_back(GetEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering())); 1928 Vals.push_back(GetEncodedSynchScope( 1929 cast<AtomicRMWInst>(I).getSynchScope())); 1930 break; 1931 case Instruction::Fence: 1932 Code = bitc::FUNC_CODE_INST_FENCE; 1933 Vals.push_back(GetEncodedOrdering(cast<FenceInst>(I).getOrdering())); 1934 Vals.push_back(GetEncodedSynchScope(cast<FenceInst>(I).getSynchScope())); 1935 break; 1936 case Instruction::Call: { 1937 const CallInst &CI = cast<CallInst>(I); 1938 PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType()); 1939 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1940 1941 Code = bitc::FUNC_CODE_INST_CALL; 1942 1943 Vals.push_back(VE.getAttributeID(CI.getAttributes())); 1944 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()) | 1945 unsigned(CI.isMustTailCall()) << 14); 1946 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee 1947 1948 // Emit value #'s for the fixed parameters. 1949 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 1950 // Check for labels (can happen with asm labels). 1951 if (FTy->getParamType(i)->isLabelTy()) 1952 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); 1953 else 1954 pushValue(CI.getArgOperand(i), InstID, Vals, VE); // fixed param. 1955 } 1956 1957 // Emit type/value pairs for varargs params. 1958 if (FTy->isVarArg()) { 1959 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands(); 1960 i != e; ++i) 1961 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs 1962 } 1963 break; 1964 } 1965 case Instruction::VAArg: 1966 Code = bitc::FUNC_CODE_INST_VAARG; 1967 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1968 pushValue(I.getOperand(0), InstID, Vals, VE); // valist. 1969 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1970 break; 1971 } 1972 1973 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1974 Vals.clear(); 1975} 1976 1977// Emit names for globals/functions etc. 1978static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1979 const ValueEnumerator &VE, 1980 BitstreamWriter &Stream) { 1981 if (VST.empty()) return; 1982 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1983 1984 // FIXME: Set up the abbrev, we know how many values there are! 1985 // FIXME: We know if the type names can use 7-bit ascii. 1986 SmallVector<unsigned, 64> NameVals; 1987 1988 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1989 SI != SE; ++SI) { 1990 1991 const ValueName &Name = *SI; 1992 1993 // Figure out the encoding to use for the name. 1994 bool is7Bit = true; 1995 bool isChar6 = true; 1996 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1997 C != E; ++C) { 1998 if (isChar6) 1999 isChar6 = BitCodeAbbrevOp::isChar6(*C); 2000 if ((unsigned char)*C & 128) { 2001 is7Bit = false; 2002 break; // don't bother scanning the rest. 2003 } 2004 } 2005 2006 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 2007 2008 // VST_ENTRY: [valueid, namechar x N] 2009 // VST_BBENTRY: [bbid, namechar x N] 2010 unsigned Code; 2011 if (isa<BasicBlock>(SI->getValue())) { 2012 Code = bitc::VST_CODE_BBENTRY; 2013 if (isChar6) 2014 AbbrevToUse = VST_BBENTRY_6_ABBREV; 2015 } else { 2016 Code = bitc::VST_CODE_ENTRY; 2017 if (isChar6) 2018 AbbrevToUse = VST_ENTRY_6_ABBREV; 2019 else if (is7Bit) 2020 AbbrevToUse = VST_ENTRY_7_ABBREV; 2021 } 2022 2023 NameVals.push_back(VE.getValueID(SI->getValue())); 2024 for (const char *P = Name.getKeyData(), 2025 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 2026 NameVals.push_back((unsigned char)*P); 2027 2028 // Emit the finished record. 2029 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 2030 NameVals.clear(); 2031 } 2032 Stream.ExitBlock(); 2033} 2034 2035static void WriteUseList(ValueEnumerator &VE, UseListOrder &&Order, 2036 BitstreamWriter &Stream) { 2037 assert(Order.Shuffle.size() >= 2 && "Shuffle too small"); 2038 unsigned Code; 2039 if (isa<BasicBlock>(Order.V)) 2040 Code = bitc::USELIST_CODE_BB; 2041 else 2042 Code = bitc::USELIST_CODE_DEFAULT; 2043 2044 SmallVector<uint64_t, 64> Record(Order.Shuffle.begin(), Order.Shuffle.end()); 2045 Record.push_back(VE.getValueID(Order.V)); 2046 Stream.EmitRecord(Code, Record); 2047} 2048 2049static void WriteUseListBlock(const Function *F, ValueEnumerator &VE, 2050 BitstreamWriter &Stream) { 2051 assert(VE.shouldPreserveUseListOrder() && 2052 "Expected to be preserving use-list order"); 2053 2054 auto hasMore = [&]() { 2055 return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F; 2056 }; 2057 if (!hasMore()) 2058 // Nothing to do. 2059 return; 2060 2061 Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3); 2062 while (hasMore()) { 2063 WriteUseList(VE, std::move(VE.UseListOrders.back()), Stream); 2064 VE.UseListOrders.pop_back(); 2065 } 2066 Stream.ExitBlock(); 2067} 2068 2069/// WriteFunction - Emit a function body to the module stream. 2070static void WriteFunction(const Function &F, ValueEnumerator &VE, 2071 BitstreamWriter &Stream) { 2072 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 2073 VE.incorporateFunction(F); 2074 2075 SmallVector<unsigned, 64> Vals; 2076 2077 // Emit the number of basic blocks, so the reader can create them ahead of 2078 // time. 2079 Vals.push_back(VE.getBasicBlocks().size()); 2080 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 2081 Vals.clear(); 2082 2083 // If there are function-local constants, emit them now. 2084 unsigned CstStart, CstEnd; 2085 VE.getFunctionConstantRange(CstStart, CstEnd); 2086 WriteConstants(CstStart, CstEnd, VE, Stream, false); 2087 2088 // If there is function-local metadata, emit it now. 2089 WriteFunctionLocalMetadata(F, VE, Stream); 2090 2091 // Keep a running idea of what the instruction ID is. 2092 unsigned InstID = CstEnd; 2093 2094 bool NeedsMetadataAttachment = false; 2095 2096 MDLocation *LastDL = nullptr; 2097 2098 // Finally, emit all the instructions, in order. 2099 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 2100 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 2101 I != E; ++I) { 2102 WriteInstruction(*I, InstID, VE, Stream, Vals); 2103 2104 if (!I->getType()->isVoidTy()) 2105 ++InstID; 2106 2107 // If the instruction has metadata, write a metadata attachment later. 2108 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc(); 2109 2110 // If the instruction has a debug location, emit it. 2111 MDLocation *DL = I->getDebugLoc(); 2112 if (!DL) 2113 continue; 2114 2115 if (DL == LastDL) { 2116 // Just repeat the same debug loc as last time. 2117 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals); 2118 continue; 2119 } 2120 2121 Vals.push_back(DL->getLine()); 2122 Vals.push_back(DL->getColumn()); 2123 Vals.push_back(VE.getMetadataOrNullID(DL->getScope())); 2124 Vals.push_back(VE.getMetadataOrNullID(DL->getInlinedAt())); 2125 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals); 2126 Vals.clear(); 2127 } 2128 2129 // Emit names for all the instructions etc. 2130 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 2131 2132 if (NeedsMetadataAttachment) 2133 WriteMetadataAttachment(F, VE, Stream); 2134 if (VE.shouldPreserveUseListOrder()) 2135 WriteUseListBlock(&F, VE, Stream); 2136 VE.purgeFunction(); 2137 Stream.ExitBlock(); 2138} 2139 2140// Emit blockinfo, which defines the standard abbreviations etc. 2141static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) { 2142 // We only want to emit block info records for blocks that have multiple 2143 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. 2144 // Other blocks can define their abbrevs inline. 2145 Stream.EnterBlockInfoBlock(2); 2146 2147 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 2148 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2149 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 2150 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 2151 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 2152 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 2153 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 2154 Abbv) != VST_ENTRY_8_ABBREV) 2155 llvm_unreachable("Unexpected abbrev ordering!"); 2156 } 2157 2158 { // 7-bit fixed width VST_ENTRY strings. 2159 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2160 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 2161 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 2162 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 2163 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 2164 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 2165 Abbv) != VST_ENTRY_7_ABBREV) 2166 llvm_unreachable("Unexpected abbrev ordering!"); 2167 } 2168 { // 6-bit char6 VST_ENTRY strings. 2169 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2170 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 2171 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 2172 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 2173 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 2174 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 2175 Abbv) != VST_ENTRY_6_ABBREV) 2176 llvm_unreachable("Unexpected abbrev ordering!"); 2177 } 2178 { // 6-bit char6 VST_BBENTRY strings. 2179 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2180 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 2181 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 2182 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 2183 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 2184 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 2185 Abbv) != VST_BBENTRY_6_ABBREV) 2186 llvm_unreachable("Unexpected abbrev ordering!"); 2187 } 2188 2189 2190 2191 { // SETTYPE abbrev for CONSTANTS_BLOCK. 2192 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2193 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 2194 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2195 VE.computeBitsRequiredForTypeIndicies())); 2196 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 2197 Abbv) != CONSTANTS_SETTYPE_ABBREV) 2198 llvm_unreachable("Unexpected abbrev ordering!"); 2199 } 2200 2201 { // INTEGER abbrev for CONSTANTS_BLOCK. 2202 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2203 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 2204 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 2205 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 2206 Abbv) != CONSTANTS_INTEGER_ABBREV) 2207 llvm_unreachable("Unexpected abbrev ordering!"); 2208 } 2209 2210 { // CE_CAST abbrev for CONSTANTS_BLOCK. 2211 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2212 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 2213 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 2214 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 2215 VE.computeBitsRequiredForTypeIndicies())); 2216 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 2217 2218 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 2219 Abbv) != CONSTANTS_CE_CAST_Abbrev) 2220 llvm_unreachable("Unexpected abbrev ordering!"); 2221 } 2222 { // NULL abbrev for CONSTANTS_BLOCK. 2223 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2224 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 2225 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 2226 Abbv) != CONSTANTS_NULL_Abbrev) 2227 llvm_unreachable("Unexpected abbrev ordering!"); 2228 } 2229 2230 // FIXME: This should only use space for first class types! 2231 2232 { // INST_LOAD abbrev for FUNCTION_BLOCK. 2233 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2234 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 2235 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 2236 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 2237 VE.computeBitsRequiredForTypeIndicies())); 2238 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 2239 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 2240 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2241 Abbv) != FUNCTION_INST_LOAD_ABBREV) 2242 llvm_unreachable("Unexpected abbrev ordering!"); 2243 } 2244 { // INST_BINOP abbrev for FUNCTION_BLOCK. 2245 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2246 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 2247 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 2248 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 2249 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 2250 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2251 Abbv) != FUNCTION_INST_BINOP_ABBREV) 2252 llvm_unreachable("Unexpected abbrev ordering!"); 2253 } 2254 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 2255 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2256 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 2257 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 2258 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 2259 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 2260 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 2261 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2262 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 2263 llvm_unreachable("Unexpected abbrev ordering!"); 2264 } 2265 { // INST_CAST abbrev for FUNCTION_BLOCK. 2266 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2267 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 2268 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 2269 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 2270 VE.computeBitsRequiredForTypeIndicies())); 2271 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 2272 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2273 Abbv) != FUNCTION_INST_CAST_ABBREV) 2274 llvm_unreachable("Unexpected abbrev ordering!"); 2275 } 2276 2277 { // INST_RET abbrev for FUNCTION_BLOCK. 2278 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2279 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 2280 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2281 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 2282 llvm_unreachable("Unexpected abbrev ordering!"); 2283 } 2284 { // INST_RET abbrev for FUNCTION_BLOCK. 2285 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2286 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 2287 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 2288 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2289 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 2290 llvm_unreachable("Unexpected abbrev ordering!"); 2291 } 2292 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 2293 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2294 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 2295 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 2296 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 2297 llvm_unreachable("Unexpected abbrev ordering!"); 2298 } 2299 { 2300 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 2301 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_GEP)); 2302 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 2303 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 2304 Log2_32_Ceil(VE.getTypes().size() + 1))); 2305 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 2306 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 2307 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 2308 FUNCTION_INST_GEP_ABBREV) 2309 llvm_unreachable("Unexpected abbrev ordering!"); 2310 } 2311 2312 Stream.ExitBlock(); 2313} 2314 2315/// WriteModule - Emit the specified module to the bitstream. 2316static void WriteModule(const Module *M, BitstreamWriter &Stream, 2317 bool ShouldPreserveUseListOrder) { 2318 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 2319 2320 SmallVector<unsigned, 1> Vals; 2321 unsigned CurVersion = 1; 2322 Vals.push_back(CurVersion); 2323 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 2324 2325 // Analyze the module, enumerating globals, functions, etc. 2326 ValueEnumerator VE(*M, ShouldPreserveUseListOrder); 2327 2328 // Emit blockinfo, which defines the standard abbreviations etc. 2329 WriteBlockInfo(VE, Stream); 2330 2331 // Emit information about attribute groups. 2332 WriteAttributeGroupTable(VE, Stream); 2333 2334 // Emit information about parameter attributes. 2335 WriteAttributeTable(VE, Stream); 2336 2337 // Emit information describing all of the types in the module. 2338 WriteTypeTable(VE, Stream); 2339 2340 writeComdats(VE, Stream); 2341 2342 // Emit top-level description of module, including target triple, inline asm, 2343 // descriptors for global variables, and function prototype info. 2344 WriteModuleInfo(M, VE, Stream); 2345 2346 // Emit constants. 2347 WriteModuleConstants(VE, Stream); 2348 2349 // Emit metadata. 2350 WriteModuleMetadata(M, VE, Stream); 2351 2352 // Emit metadata. 2353 WriteModuleMetadataStore(M, Stream); 2354 2355 // Emit names for globals/functions etc. 2356 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 2357 2358 // Emit module-level use-lists. 2359 if (VE.shouldPreserveUseListOrder()) 2360 WriteUseListBlock(nullptr, VE, Stream); 2361 2362 // Emit function bodies. 2363 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) 2364 if (!F->isDeclaration()) 2365 WriteFunction(*F, VE, Stream); 2366 2367 Stream.ExitBlock(); 2368} 2369 2370/// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 2371/// header and trailer to make it compatible with the system archiver. To do 2372/// this we emit the following header, and then emit a trailer that pads the 2373/// file out to be a multiple of 16 bytes. 2374/// 2375/// struct bc_header { 2376/// uint32_t Magic; // 0x0B17C0DE 2377/// uint32_t Version; // Version, currently always 0. 2378/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 2379/// uint32_t BitcodeSize; // Size of traditional bitcode file. 2380/// uint32_t CPUType; // CPU specifier. 2381/// ... potentially more later ... 2382/// }; 2383enum { 2384 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 2385 DarwinBCHeaderSize = 5*4 2386}; 2387 2388static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer, 2389 uint32_t &Position) { 2390 Buffer[Position + 0] = (unsigned char) (Value >> 0); 2391 Buffer[Position + 1] = (unsigned char) (Value >> 8); 2392 Buffer[Position + 2] = (unsigned char) (Value >> 16); 2393 Buffer[Position + 3] = (unsigned char) (Value >> 24); 2394 Position += 4; 2395} 2396 2397static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer, 2398 const Triple &TT) { 2399 unsigned CPUType = ~0U; 2400 2401 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*, 2402 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic 2403 // number from /usr/include/mach/machine.h. It is ok to reproduce the 2404 // specific constants here because they are implicitly part of the Darwin ABI. 2405 enum { 2406 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 2407 DARWIN_CPU_TYPE_X86 = 7, 2408 DARWIN_CPU_TYPE_ARM = 12, 2409 DARWIN_CPU_TYPE_POWERPC = 18 2410 }; 2411 2412 Triple::ArchType Arch = TT.getArch(); 2413 if (Arch == Triple::x86_64) 2414 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 2415 else if (Arch == Triple::x86) 2416 CPUType = DARWIN_CPU_TYPE_X86; 2417 else if (Arch == Triple::ppc) 2418 CPUType = DARWIN_CPU_TYPE_POWERPC; 2419 else if (Arch == Triple::ppc64) 2420 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 2421 else if (Arch == Triple::arm || Arch == Triple::thumb) 2422 CPUType = DARWIN_CPU_TYPE_ARM; 2423 2424 // Traditional Bitcode starts after header. 2425 assert(Buffer.size() >= DarwinBCHeaderSize && 2426 "Expected header size to be reserved"); 2427 unsigned BCOffset = DarwinBCHeaderSize; 2428 unsigned BCSize = Buffer.size()-DarwinBCHeaderSize; 2429 2430 // Write the magic and version. 2431 unsigned Position = 0; 2432 WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position); 2433 WriteInt32ToBuffer(0 , Buffer, Position); // Version. 2434 WriteInt32ToBuffer(BCOffset , Buffer, Position); 2435 WriteInt32ToBuffer(BCSize , Buffer, Position); 2436 WriteInt32ToBuffer(CPUType , Buffer, Position); 2437 2438 // If the file is not a multiple of 16 bytes, insert dummy padding. 2439 while (Buffer.size() & 15) 2440 Buffer.push_back(0); 2441} 2442 2443/// WriteBitcodeToFile - Write the specified module to the specified output 2444/// stream. 2445void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out, 2446 bool ShouldPreserveUseListOrder) { 2447 SmallVector<char, 0> Buffer; 2448 Buffer.reserve(256*1024); 2449 2450 // If this is darwin or another generic macho target, reserve space for the 2451 // header. 2452 Triple TT(M->getTargetTriple()); 2453 if (TT.isOSDarwin()) 2454 Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0); 2455 2456 // Emit the module into the buffer. 2457 { 2458 BitstreamWriter Stream(Buffer); 2459 2460 // Emit the file header. 2461 Stream.Emit((unsigned)'B', 8); 2462 Stream.Emit((unsigned)'C', 8); 2463 Stream.Emit(0x0, 4); 2464 Stream.Emit(0xC, 4); 2465 Stream.Emit(0xE, 4); 2466 Stream.Emit(0xD, 4); 2467 2468 // Emit the module. 2469 WriteModule(M, Stream, ShouldPreserveUseListOrder); 2470 } 2471 2472 if (TT.isOSDarwin()) 2473 EmitDarwinBCHeaderAndTrailer(Buffer, TT); 2474 2475 // Write the generated bitstream to "Out". 2476 Out.write((char*)&Buffer.front(), Buffer.size()); 2477} 2478