BitcodeWriter.cpp revision a2de37c897556fbd1f94a3ed84ad27accd8f8deb
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/DerivedTypes.h" 21#include "llvm/IR/InlineAsm.h" 22#include "llvm/IR/Instructions.h" 23#include "llvm/IR/Module.h" 24#include "llvm/IR/Operator.h" 25#include "llvm/IR/ValueSymbolTable.h" 26#include "llvm/Support/CommandLine.h" 27#include "llvm/Support/ErrorHandling.h" 28#include "llvm/Support/MathExtras.h" 29#include "llvm/Support/Program.h" 30#include "llvm/Support/raw_ostream.h" 31#include <cctype> 32#include <map> 33using namespace llvm; 34 35static cl::opt<bool> 36EnablePreserveUseListOrdering("enable-bc-uselist-preserve", 37 cl::desc("Turn on experimental support for " 38 "use-list order preservation."), 39 cl::init(false), cl::Hidden); 40 41/// These are manifest constants used by the bitcode writer. They do not need to 42/// be kept in sync with the reader, but need to be consistent within this file. 43enum { 44 // VALUE_SYMTAB_BLOCK abbrev id's. 45 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 46 VST_ENTRY_7_ABBREV, 47 VST_ENTRY_6_ABBREV, 48 VST_BBENTRY_6_ABBREV, 49 50 // CONSTANTS_BLOCK abbrev id's. 51 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 52 CONSTANTS_INTEGER_ABBREV, 53 CONSTANTS_CE_CAST_Abbrev, 54 CONSTANTS_NULL_Abbrev, 55 56 // FUNCTION_BLOCK abbrev id's. 57 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 58 FUNCTION_INST_BINOP_ABBREV, 59 FUNCTION_INST_BINOP_FLAGS_ABBREV, 60 FUNCTION_INST_CAST_ABBREV, 61 FUNCTION_INST_RET_VOID_ABBREV, 62 FUNCTION_INST_RET_VAL_ABBREV, 63 FUNCTION_INST_UNREACHABLE_ABBREV, 64 65 // SwitchInst Magic 66 SWITCH_INST_MAGIC = 0x4B5 // May 2012 => 1205 => Hex 67}; 68 69static unsigned GetEncodedCastOpcode(unsigned Opcode) { 70 switch (Opcode) { 71 default: llvm_unreachable("Unknown cast instruction!"); 72 case Instruction::Trunc : return bitc::CAST_TRUNC; 73 case Instruction::ZExt : return bitc::CAST_ZEXT; 74 case Instruction::SExt : return bitc::CAST_SEXT; 75 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 76 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 77 case Instruction::UIToFP : return bitc::CAST_UITOFP; 78 case Instruction::SIToFP : return bitc::CAST_SITOFP; 79 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 80 case Instruction::FPExt : return bitc::CAST_FPEXT; 81 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 82 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 83 case Instruction::BitCast : return bitc::CAST_BITCAST; 84 } 85} 86 87static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 88 switch (Opcode) { 89 default: llvm_unreachable("Unknown binary instruction!"); 90 case Instruction::Add: 91 case Instruction::FAdd: return bitc::BINOP_ADD; 92 case Instruction::Sub: 93 case Instruction::FSub: return bitc::BINOP_SUB; 94 case Instruction::Mul: 95 case Instruction::FMul: return bitc::BINOP_MUL; 96 case Instruction::UDiv: return bitc::BINOP_UDIV; 97 case Instruction::FDiv: 98 case Instruction::SDiv: return bitc::BINOP_SDIV; 99 case Instruction::URem: return bitc::BINOP_UREM; 100 case Instruction::FRem: 101 case Instruction::SRem: return bitc::BINOP_SREM; 102 case Instruction::Shl: return bitc::BINOP_SHL; 103 case Instruction::LShr: return bitc::BINOP_LSHR; 104 case Instruction::AShr: return bitc::BINOP_ASHR; 105 case Instruction::And: return bitc::BINOP_AND; 106 case Instruction::Or: return bitc::BINOP_OR; 107 case Instruction::Xor: return bitc::BINOP_XOR; 108 } 109} 110 111static unsigned GetEncodedRMWOperation(AtomicRMWInst::BinOp Op) { 112 switch (Op) { 113 default: llvm_unreachable("Unknown RMW operation!"); 114 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG; 115 case AtomicRMWInst::Add: return bitc::RMW_ADD; 116 case AtomicRMWInst::Sub: return bitc::RMW_SUB; 117 case AtomicRMWInst::And: return bitc::RMW_AND; 118 case AtomicRMWInst::Nand: return bitc::RMW_NAND; 119 case AtomicRMWInst::Or: return bitc::RMW_OR; 120 case AtomicRMWInst::Xor: return bitc::RMW_XOR; 121 case AtomicRMWInst::Max: return bitc::RMW_MAX; 122 case AtomicRMWInst::Min: return bitc::RMW_MIN; 123 case AtomicRMWInst::UMax: return bitc::RMW_UMAX; 124 case AtomicRMWInst::UMin: return bitc::RMW_UMIN; 125 } 126} 127 128static unsigned GetEncodedOrdering(AtomicOrdering Ordering) { 129 switch (Ordering) { 130 case NotAtomic: return bitc::ORDERING_NOTATOMIC; 131 case Unordered: return bitc::ORDERING_UNORDERED; 132 case Monotonic: return bitc::ORDERING_MONOTONIC; 133 case Acquire: return bitc::ORDERING_ACQUIRE; 134 case Release: return bitc::ORDERING_RELEASE; 135 case AcquireRelease: return bitc::ORDERING_ACQREL; 136 case SequentiallyConsistent: return bitc::ORDERING_SEQCST; 137 } 138 llvm_unreachable("Invalid ordering"); 139} 140 141static unsigned GetEncodedSynchScope(SynchronizationScope SynchScope) { 142 switch (SynchScope) { 143 case SingleThread: return bitc::SYNCHSCOPE_SINGLETHREAD; 144 case CrossThread: return bitc::SYNCHSCOPE_CROSSTHREAD; 145 } 146 llvm_unreachable("Invalid synch scope"); 147} 148 149static void WriteStringRecord(unsigned Code, StringRef Str, 150 unsigned AbbrevToUse, BitstreamWriter &Stream) { 151 SmallVector<unsigned, 64> Vals; 152 153 // Code: [strchar x N] 154 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 155 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i])) 156 AbbrevToUse = 0; 157 Vals.push_back(Str[i]); 158 } 159 160 // Emit the finished record. 161 Stream.EmitRecord(Code, Vals, AbbrevToUse); 162} 163 164/// \brief This returns an integer containing an encoding of all the LLVM 165/// attributes found in the given attribute bitset. Any change to this encoding 166/// is a breaking change to bitcode compatibility. 167/// N.B. This should be used only by the bitcode writer! 168static uint64_t encodeLLVMAttributesForBitcode(AttributeSet Attrs, 169 unsigned Index) { 170 // FIXME: Remove in 4.0! 171 172 // FIXME: It doesn't make sense to store the alignment information as an 173 // expanded out value, we should store it as a log2 value. However, we can't 174 // just change that here without breaking bitcode compatibility. If this ever 175 // becomes a problem in practice, we should introduce new tag numbers in the 176 // bitcode file and have those tags use a more efficiently encoded alignment 177 // field. 178 179 // Store the alignment in the bitcode as a 16-bit raw value instead of a 5-bit 180 // log2 encoded value. Shift the bits above the alignment up by 11 bits. 181 uint64_t EncodedAttrs = Attrs.Raw(Index) & 0xffff; 182 if (Attrs.hasAttribute(Index, Attribute::Alignment)) 183 EncodedAttrs |= Attrs.getParamAlignment(Index) << 16; 184 EncodedAttrs |= (Attrs.Raw(Index) & (0xffffULL << 21)) << 11; 185 return EncodedAttrs; 186} 187 188static void WriteAttributeTable(const ValueEnumerator &VE, 189 BitstreamWriter &Stream) { 190 const std::vector<AttributeSet> &Attrs = VE.getAttributes(); 191 if (Attrs.empty()) return; 192 193 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 194 195 SmallVector<uint64_t, 64> Record; 196 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 197 const AttributeSet &A = Attrs[i]; 198 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) { 199 unsigned Index = A.getSlotIndex(i); 200 Record.push_back(Index); 201 Record.push_back(encodeLLVMAttributesForBitcode(A.getSlotAttributes(i), 202 Index)); 203 } 204 205 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY_OLD, Record); 206 Record.clear(); 207 } 208 209 Stream.ExitBlock(); 210} 211 212/// WriteTypeTable - Write out the type table for a module. 213static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) { 214 const ValueEnumerator::TypeList &TypeList = VE.getTypes(); 215 216 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */); 217 SmallVector<uint64_t, 64> TypeVals; 218 219 uint64_t NumBits = Log2_32_Ceil(VE.getTypes().size()+1); 220 221 // Abbrev for TYPE_CODE_POINTER. 222 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 223 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 224 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 225 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 226 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 227 228 // Abbrev for TYPE_CODE_FUNCTION. 229 Abbv = new BitCodeAbbrev(); 230 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION)); 231 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 232 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 233 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 234 235 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 236 237 // Abbrev for TYPE_CODE_STRUCT_ANON. 238 Abbv = new BitCodeAbbrev(); 239 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON)); 240 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 241 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 242 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 243 244 unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv); 245 246 // Abbrev for TYPE_CODE_STRUCT_NAME. 247 Abbv = new BitCodeAbbrev(); 248 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME)); 249 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 250 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 251 unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv); 252 253 // Abbrev for TYPE_CODE_STRUCT_NAMED. 254 Abbv = new BitCodeAbbrev(); 255 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED)); 256 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 257 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 258 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 259 260 unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv); 261 262 // Abbrev for TYPE_CODE_ARRAY. 263 Abbv = new BitCodeAbbrev(); 264 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 265 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 266 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 267 268 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 269 270 // Emit an entry count so the reader can reserve space. 271 TypeVals.push_back(TypeList.size()); 272 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 273 TypeVals.clear(); 274 275 // Loop over all of the types, emitting each in turn. 276 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 277 Type *T = TypeList[i]; 278 int AbbrevToUse = 0; 279 unsigned Code = 0; 280 281 switch (T->getTypeID()) { 282 default: llvm_unreachable("Unknown type!"); 283 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 284 case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; break; 285 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 286 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 287 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 288 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 289 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 290 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 291 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 292 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break; 293 case Type::IntegerTyID: 294 // INTEGER: [width] 295 Code = bitc::TYPE_CODE_INTEGER; 296 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 297 break; 298 case Type::PointerTyID: { 299 PointerType *PTy = cast<PointerType>(T); 300 // POINTER: [pointee type, address space] 301 Code = bitc::TYPE_CODE_POINTER; 302 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 303 unsigned AddressSpace = PTy->getAddressSpace(); 304 TypeVals.push_back(AddressSpace); 305 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 306 break; 307 } 308 case Type::FunctionTyID: { 309 FunctionType *FT = cast<FunctionType>(T); 310 // FUNCTION: [isvararg, retty, paramty x N] 311 Code = bitc::TYPE_CODE_FUNCTION; 312 TypeVals.push_back(FT->isVarArg()); 313 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 314 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 315 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 316 AbbrevToUse = FunctionAbbrev; 317 break; 318 } 319 case Type::StructTyID: { 320 StructType *ST = cast<StructType>(T); 321 // STRUCT: [ispacked, eltty x N] 322 TypeVals.push_back(ST->isPacked()); 323 // Output all of the element types. 324 for (StructType::element_iterator I = ST->element_begin(), 325 E = ST->element_end(); I != E; ++I) 326 TypeVals.push_back(VE.getTypeID(*I)); 327 328 if (ST->isLiteral()) { 329 Code = bitc::TYPE_CODE_STRUCT_ANON; 330 AbbrevToUse = StructAnonAbbrev; 331 } else { 332 if (ST->isOpaque()) { 333 Code = bitc::TYPE_CODE_OPAQUE; 334 } else { 335 Code = bitc::TYPE_CODE_STRUCT_NAMED; 336 AbbrevToUse = StructNamedAbbrev; 337 } 338 339 // Emit the name if it is present. 340 if (!ST->getName().empty()) 341 WriteStringRecord(bitc::TYPE_CODE_STRUCT_NAME, ST->getName(), 342 StructNameAbbrev, Stream); 343 } 344 break; 345 } 346 case Type::ArrayTyID: { 347 ArrayType *AT = cast<ArrayType>(T); 348 // ARRAY: [numelts, eltty] 349 Code = bitc::TYPE_CODE_ARRAY; 350 TypeVals.push_back(AT->getNumElements()); 351 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 352 AbbrevToUse = ArrayAbbrev; 353 break; 354 } 355 case Type::VectorTyID: { 356 VectorType *VT = cast<VectorType>(T); 357 // VECTOR [numelts, eltty] 358 Code = bitc::TYPE_CODE_VECTOR; 359 TypeVals.push_back(VT->getNumElements()); 360 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 361 break; 362 } 363 } 364 365 // Emit the finished record. 366 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 367 TypeVals.clear(); 368 } 369 370 Stream.ExitBlock(); 371} 372 373static unsigned getEncodedLinkage(const GlobalValue *GV) { 374 switch (GV->getLinkage()) { 375 case GlobalValue::ExternalLinkage: return 0; 376 case GlobalValue::WeakAnyLinkage: return 1; 377 case GlobalValue::AppendingLinkage: return 2; 378 case GlobalValue::InternalLinkage: return 3; 379 case GlobalValue::LinkOnceAnyLinkage: return 4; 380 case GlobalValue::DLLImportLinkage: return 5; 381 case GlobalValue::DLLExportLinkage: return 6; 382 case GlobalValue::ExternalWeakLinkage: return 7; 383 case GlobalValue::CommonLinkage: return 8; 384 case GlobalValue::PrivateLinkage: return 9; 385 case GlobalValue::WeakODRLinkage: return 10; 386 case GlobalValue::LinkOnceODRLinkage: return 11; 387 case GlobalValue::AvailableExternallyLinkage: return 12; 388 case GlobalValue::LinkerPrivateLinkage: return 13; 389 case GlobalValue::LinkerPrivateWeakLinkage: return 14; 390 case GlobalValue::LinkOnceODRAutoHideLinkage: return 15; 391 } 392 llvm_unreachable("Invalid linkage"); 393} 394 395static unsigned getEncodedVisibility(const GlobalValue *GV) { 396 switch (GV->getVisibility()) { 397 case GlobalValue::DefaultVisibility: return 0; 398 case GlobalValue::HiddenVisibility: return 1; 399 case GlobalValue::ProtectedVisibility: return 2; 400 } 401 llvm_unreachable("Invalid visibility"); 402} 403 404static unsigned getEncodedThreadLocalMode(const GlobalVariable *GV) { 405 switch (GV->getThreadLocalMode()) { 406 case GlobalVariable::NotThreadLocal: return 0; 407 case GlobalVariable::GeneralDynamicTLSModel: return 1; 408 case GlobalVariable::LocalDynamicTLSModel: return 2; 409 case GlobalVariable::InitialExecTLSModel: return 3; 410 case GlobalVariable::LocalExecTLSModel: return 4; 411 } 412 llvm_unreachable("Invalid TLS model"); 413} 414 415// Emit top-level description of module, including target triple, inline asm, 416// descriptors for global variables, and function prototype info. 417static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE, 418 BitstreamWriter &Stream) { 419 // Emit various pieces of data attached to a module. 420 if (!M->getTargetTriple().empty()) 421 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 422 0/*TODO*/, Stream); 423 if (!M->getDataLayout().empty()) 424 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 425 0/*TODO*/, Stream); 426 if (!M->getModuleInlineAsm().empty()) 427 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 428 0/*TODO*/, Stream); 429 430 // Emit information about sections and GC, computing how many there are. Also 431 // compute the maximum alignment value. 432 std::map<std::string, unsigned> SectionMap; 433 std::map<std::string, unsigned> GCMap; 434 unsigned MaxAlignment = 0; 435 unsigned MaxGlobalType = 0; 436 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 437 GV != E; ++GV) { 438 MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); 439 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); 440 if (GV->hasSection()) { 441 // Give section names unique ID's. 442 unsigned &Entry = SectionMap[GV->getSection()]; 443 if (!Entry) { 444 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 445 0/*TODO*/, Stream); 446 Entry = SectionMap.size(); 447 } 448 } 449 } 450 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 451 MaxAlignment = std::max(MaxAlignment, F->getAlignment()); 452 if (F->hasSection()) { 453 // Give section names unique ID's. 454 unsigned &Entry = SectionMap[F->getSection()]; 455 if (!Entry) { 456 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 457 0/*TODO*/, Stream); 458 Entry = SectionMap.size(); 459 } 460 } 461 if (F->hasGC()) { 462 // Same for GC names. 463 unsigned &Entry = GCMap[F->getGC()]; 464 if (!Entry) { 465 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(), 466 0/*TODO*/, Stream); 467 Entry = GCMap.size(); 468 } 469 } 470 } 471 472 // Emit abbrev for globals, now that we know # sections and max alignment. 473 unsigned SimpleGVarAbbrev = 0; 474 if (!M->global_empty()) { 475 // Add an abbrev for common globals with no visibility or thread localness. 476 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 477 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 478 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 479 Log2_32_Ceil(MaxGlobalType+1))); 480 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 481 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 482 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage. 483 if (MaxAlignment == 0) // Alignment. 484 Abbv->Add(BitCodeAbbrevOp(0)); 485 else { 486 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 487 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 488 Log2_32_Ceil(MaxEncAlignment+1))); 489 } 490 if (SectionMap.empty()) // Section. 491 Abbv->Add(BitCodeAbbrevOp(0)); 492 else 493 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 494 Log2_32_Ceil(SectionMap.size()+1))); 495 // Don't bother emitting vis + thread local. 496 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 497 } 498 499 // Emit the global variable information. 500 SmallVector<unsigned, 64> Vals; 501 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 502 GV != E; ++GV) { 503 unsigned AbbrevToUse = 0; 504 505 // GLOBALVAR: [type, isconst, initid, 506 // linkage, alignment, section, visibility, threadlocal, 507 // unnamed_addr] 508 Vals.push_back(VE.getTypeID(GV->getType())); 509 Vals.push_back(GV->isConstant()); 510 Vals.push_back(GV->isDeclaration() ? 0 : 511 (VE.getValueID(GV->getInitializer()) + 1)); 512 Vals.push_back(getEncodedLinkage(GV)); 513 Vals.push_back(Log2_32(GV->getAlignment())+1); 514 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); 515 if (GV->isThreadLocal() || 516 GV->getVisibility() != GlobalValue::DefaultVisibility || 517 GV->hasUnnamedAddr() || GV->isExternallyInitialized()) { 518 Vals.push_back(getEncodedVisibility(GV)); 519 Vals.push_back(getEncodedThreadLocalMode(GV)); 520 Vals.push_back(GV->hasUnnamedAddr()); 521 Vals.push_back(GV->isExternallyInitialized()); 522 } else { 523 AbbrevToUse = SimpleGVarAbbrev; 524 } 525 526 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 527 Vals.clear(); 528 } 529 530 // Emit the function proto information. 531 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 532 // FUNCTION: [type, callingconv, isproto, linkage, paramattrs, alignment, 533 // section, visibility, gc, unnamed_addr] 534 Vals.push_back(VE.getTypeID(F->getType())); 535 Vals.push_back(F->getCallingConv()); 536 Vals.push_back(F->isDeclaration()); 537 Vals.push_back(getEncodedLinkage(F)); 538 Vals.push_back(VE.getAttributeID(F->getAttributes())); 539 Vals.push_back(Log2_32(F->getAlignment())+1); 540 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); 541 Vals.push_back(getEncodedVisibility(F)); 542 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0); 543 Vals.push_back(F->hasUnnamedAddr()); 544 545 unsigned AbbrevToUse = 0; 546 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 547 Vals.clear(); 548 } 549 550 // Emit the alias information. 551 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); 552 AI != E; ++AI) { 553 // ALIAS: [alias type, aliasee val#, linkage, visibility] 554 Vals.push_back(VE.getTypeID(AI->getType())); 555 Vals.push_back(VE.getValueID(AI->getAliasee())); 556 Vals.push_back(getEncodedLinkage(AI)); 557 Vals.push_back(getEncodedVisibility(AI)); 558 unsigned AbbrevToUse = 0; 559 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 560 Vals.clear(); 561 } 562} 563 564static uint64_t GetOptimizationFlags(const Value *V) { 565 uint64_t Flags = 0; 566 567 if (const OverflowingBinaryOperator *OBO = 568 dyn_cast<OverflowingBinaryOperator>(V)) { 569 if (OBO->hasNoSignedWrap()) 570 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 571 if (OBO->hasNoUnsignedWrap()) 572 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 573 } else if (const PossiblyExactOperator *PEO = 574 dyn_cast<PossiblyExactOperator>(V)) { 575 if (PEO->isExact()) 576 Flags |= 1 << bitc::PEO_EXACT; 577 } else if (const FPMathOperator *FPMO = 578 dyn_cast<const FPMathOperator>(V)) { 579 if (FPMO->hasUnsafeAlgebra()) 580 Flags |= FastMathFlags::UnsafeAlgebra; 581 if (FPMO->hasNoNaNs()) 582 Flags |= FastMathFlags::NoNaNs; 583 if (FPMO->hasNoInfs()) 584 Flags |= FastMathFlags::NoInfs; 585 if (FPMO->hasNoSignedZeros()) 586 Flags |= FastMathFlags::NoSignedZeros; 587 if (FPMO->hasAllowReciprocal()) 588 Flags |= FastMathFlags::AllowReciprocal; 589 } 590 591 return Flags; 592} 593 594static void WriteMDNode(const MDNode *N, 595 const ValueEnumerator &VE, 596 BitstreamWriter &Stream, 597 SmallVector<uint64_t, 64> &Record) { 598 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { 599 if (N->getOperand(i)) { 600 Record.push_back(VE.getTypeID(N->getOperand(i)->getType())); 601 Record.push_back(VE.getValueID(N->getOperand(i))); 602 } else { 603 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext()))); 604 Record.push_back(0); 605 } 606 } 607 unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE : 608 bitc::METADATA_NODE; 609 Stream.EmitRecord(MDCode, Record, 0); 610 Record.clear(); 611} 612 613static void WriteModuleMetadata(const Module *M, 614 const ValueEnumerator &VE, 615 BitstreamWriter &Stream) { 616 const ValueEnumerator::ValueList &Vals = VE.getMDValues(); 617 bool StartedMetadataBlock = false; 618 unsigned MDSAbbrev = 0; 619 SmallVector<uint64_t, 64> Record; 620 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 621 622 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) { 623 if (!N->isFunctionLocal() || !N->getFunction()) { 624 if (!StartedMetadataBlock) { 625 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 626 StartedMetadataBlock = true; 627 } 628 WriteMDNode(N, VE, Stream, Record); 629 } 630 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) { 631 if (!StartedMetadataBlock) { 632 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 633 634 // Abbrev for METADATA_STRING. 635 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 636 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 637 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 638 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 639 MDSAbbrev = Stream.EmitAbbrev(Abbv); 640 StartedMetadataBlock = true; 641 } 642 643 // Code: [strchar x N] 644 Record.append(MDS->begin(), MDS->end()); 645 646 // Emit the finished record. 647 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 648 Record.clear(); 649 } 650 } 651 652 // Write named metadata. 653 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(), 654 E = M->named_metadata_end(); I != E; ++I) { 655 const NamedMDNode *NMD = I; 656 if (!StartedMetadataBlock) { 657 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 658 StartedMetadataBlock = true; 659 } 660 661 // Write name. 662 StringRef Str = NMD->getName(); 663 for (unsigned i = 0, e = Str.size(); i != e; ++i) 664 Record.push_back(Str[i]); 665 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/); 666 Record.clear(); 667 668 // Write named metadata operands. 669 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) 670 Record.push_back(VE.getValueID(NMD->getOperand(i))); 671 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0); 672 Record.clear(); 673 } 674 675 if (StartedMetadataBlock) 676 Stream.ExitBlock(); 677} 678 679static void WriteFunctionLocalMetadata(const Function &F, 680 const ValueEnumerator &VE, 681 BitstreamWriter &Stream) { 682 bool StartedMetadataBlock = false; 683 SmallVector<uint64_t, 64> Record; 684 const SmallVector<const MDNode *, 8> &Vals = VE.getFunctionLocalMDValues(); 685 for (unsigned i = 0, e = Vals.size(); i != e; ++i) 686 if (const MDNode *N = Vals[i]) 687 if (N->isFunctionLocal() && N->getFunction() == &F) { 688 if (!StartedMetadataBlock) { 689 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 690 StartedMetadataBlock = true; 691 } 692 WriteMDNode(N, VE, Stream, Record); 693 } 694 695 if (StartedMetadataBlock) 696 Stream.ExitBlock(); 697} 698 699static void WriteMetadataAttachment(const Function &F, 700 const ValueEnumerator &VE, 701 BitstreamWriter &Stream) { 702 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 703 704 SmallVector<uint64_t, 64> Record; 705 706 // Write metadata attachments 707 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 708 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs; 709 710 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 711 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 712 I != E; ++I) { 713 MDs.clear(); 714 I->getAllMetadataOtherThanDebugLoc(MDs); 715 716 // If no metadata, ignore instruction. 717 if (MDs.empty()) continue; 718 719 Record.push_back(VE.getInstructionID(I)); 720 721 for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 722 Record.push_back(MDs[i].first); 723 Record.push_back(VE.getValueID(MDs[i].second)); 724 } 725 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0); 726 Record.clear(); 727 } 728 729 Stream.ExitBlock(); 730} 731 732static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) { 733 SmallVector<uint64_t, 64> Record; 734 735 // Write metadata kinds 736 // METADATA_KIND - [n x [id, name]] 737 SmallVector<StringRef, 8> Names; 738 M->getMDKindNames(Names); 739 740 if (Names.empty()) return; 741 742 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 743 744 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) { 745 Record.push_back(MDKindID); 746 StringRef KName = Names[MDKindID]; 747 Record.append(KName.begin(), KName.end()); 748 749 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 750 Record.clear(); 751 } 752 753 Stream.ExitBlock(); 754} 755 756static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) { 757 if ((int64_t)V >= 0) 758 Vals.push_back(V << 1); 759 else 760 Vals.push_back((-V << 1) | 1); 761} 762 763static void EmitAPInt(SmallVectorImpl<uint64_t> &Vals, 764 unsigned &Code, unsigned &AbbrevToUse, const APInt &Val, 765 bool EmitSizeForWideNumbers = false 766 ) { 767 if (Val.getBitWidth() <= 64) { 768 uint64_t V = Val.getSExtValue(); 769 emitSignedInt64(Vals, V); 770 Code = bitc::CST_CODE_INTEGER; 771 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 772 } else { 773 // Wide integers, > 64 bits in size. 774 // We have an arbitrary precision integer value to write whose 775 // bit width is > 64. However, in canonical unsigned integer 776 // format it is likely that the high bits are going to be zero. 777 // So, we only write the number of active words. 778 unsigned NWords = Val.getActiveWords(); 779 780 if (EmitSizeForWideNumbers) 781 Vals.push_back(NWords); 782 783 const uint64_t *RawWords = Val.getRawData(); 784 for (unsigned i = 0; i != NWords; ++i) { 785 emitSignedInt64(Vals, RawWords[i]); 786 } 787 Code = bitc::CST_CODE_WIDE_INTEGER; 788 } 789} 790 791static void WriteConstants(unsigned FirstVal, unsigned LastVal, 792 const ValueEnumerator &VE, 793 BitstreamWriter &Stream, bool isGlobal) { 794 if (FirstVal == LastVal) return; 795 796 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 797 798 unsigned AggregateAbbrev = 0; 799 unsigned String8Abbrev = 0; 800 unsigned CString7Abbrev = 0; 801 unsigned CString6Abbrev = 0; 802 // If this is a constant pool for the module, emit module-specific abbrevs. 803 if (isGlobal) { 804 // Abbrev for CST_CODE_AGGREGATE. 805 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 806 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 807 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 808 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 809 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 810 811 // Abbrev for CST_CODE_STRING. 812 Abbv = new BitCodeAbbrev(); 813 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 814 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 815 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 816 String8Abbrev = Stream.EmitAbbrev(Abbv); 817 // Abbrev for CST_CODE_CSTRING. 818 Abbv = new BitCodeAbbrev(); 819 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 820 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 821 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 822 CString7Abbrev = Stream.EmitAbbrev(Abbv); 823 // Abbrev for CST_CODE_CSTRING. 824 Abbv = new BitCodeAbbrev(); 825 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 826 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 827 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 828 CString6Abbrev = Stream.EmitAbbrev(Abbv); 829 } 830 831 SmallVector<uint64_t, 64> Record; 832 833 const ValueEnumerator::ValueList &Vals = VE.getValues(); 834 Type *LastTy = 0; 835 for (unsigned i = FirstVal; i != LastVal; ++i) { 836 const Value *V = Vals[i].first; 837 // If we need to switch types, do so now. 838 if (V->getType() != LastTy) { 839 LastTy = V->getType(); 840 Record.push_back(VE.getTypeID(LastTy)); 841 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 842 CONSTANTS_SETTYPE_ABBREV); 843 Record.clear(); 844 } 845 846 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 847 Record.push_back(unsigned(IA->hasSideEffects()) | 848 unsigned(IA->isAlignStack()) << 1 | 849 unsigned(IA->getDialect()&1) << 2); 850 851 // Add the asm string. 852 const std::string &AsmStr = IA->getAsmString(); 853 Record.push_back(AsmStr.size()); 854 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 855 Record.push_back(AsmStr[i]); 856 857 // Add the constraint string. 858 const std::string &ConstraintStr = IA->getConstraintString(); 859 Record.push_back(ConstraintStr.size()); 860 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 861 Record.push_back(ConstraintStr[i]); 862 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 863 Record.clear(); 864 continue; 865 } 866 const Constant *C = cast<Constant>(V); 867 unsigned Code = -1U; 868 unsigned AbbrevToUse = 0; 869 if (C->isNullValue()) { 870 Code = bitc::CST_CODE_NULL; 871 } else if (isa<UndefValue>(C)) { 872 Code = bitc::CST_CODE_UNDEF; 873 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 874 EmitAPInt(Record, Code, AbbrevToUse, IV->getValue()); 875 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 876 Code = bitc::CST_CODE_FLOAT; 877 Type *Ty = CFP->getType(); 878 if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) { 879 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 880 } else if (Ty->isX86_FP80Ty()) { 881 // api needed to prevent premature destruction 882 // bits are not in the same order as a normal i80 APInt, compensate. 883 APInt api = CFP->getValueAPF().bitcastToAPInt(); 884 const uint64_t *p = api.getRawData(); 885 Record.push_back((p[1] << 48) | (p[0] >> 16)); 886 Record.push_back(p[0] & 0xffffLL); 887 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 888 APInt api = CFP->getValueAPF().bitcastToAPInt(); 889 const uint64_t *p = api.getRawData(); 890 Record.push_back(p[0]); 891 Record.push_back(p[1]); 892 } else { 893 assert (0 && "Unknown FP type!"); 894 } 895 } else if (isa<ConstantDataSequential>(C) && 896 cast<ConstantDataSequential>(C)->isString()) { 897 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C); 898 // Emit constant strings specially. 899 unsigned NumElts = Str->getNumElements(); 900 // If this is a null-terminated string, use the denser CSTRING encoding. 901 if (Str->isCString()) { 902 Code = bitc::CST_CODE_CSTRING; 903 --NumElts; // Don't encode the null, which isn't allowed by char6. 904 } else { 905 Code = bitc::CST_CODE_STRING; 906 AbbrevToUse = String8Abbrev; 907 } 908 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 909 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 910 for (unsigned i = 0; i != NumElts; ++i) { 911 unsigned char V = Str->getElementAsInteger(i); 912 Record.push_back(V); 913 isCStr7 &= (V & 128) == 0; 914 if (isCStrChar6) 915 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 916 } 917 918 if (isCStrChar6) 919 AbbrevToUse = CString6Abbrev; 920 else if (isCStr7) 921 AbbrevToUse = CString7Abbrev; 922 } else if (const ConstantDataSequential *CDS = 923 dyn_cast<ConstantDataSequential>(C)) { 924 Code = bitc::CST_CODE_DATA; 925 Type *EltTy = CDS->getType()->getElementType(); 926 if (isa<IntegerType>(EltTy)) { 927 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) 928 Record.push_back(CDS->getElementAsInteger(i)); 929 } else if (EltTy->isFloatTy()) { 930 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 931 union { float F; uint32_t I; }; 932 F = CDS->getElementAsFloat(i); 933 Record.push_back(I); 934 } 935 } else { 936 assert(EltTy->isDoubleTy() && "Unknown ConstantData element type"); 937 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 938 union { double F; uint64_t I; }; 939 F = CDS->getElementAsDouble(i); 940 Record.push_back(I); 941 } 942 } 943 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) || 944 isa<ConstantVector>(C)) { 945 Code = bitc::CST_CODE_AGGREGATE; 946 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 947 Record.push_back(VE.getValueID(C->getOperand(i))); 948 AbbrevToUse = AggregateAbbrev; 949 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 950 switch (CE->getOpcode()) { 951 default: 952 if (Instruction::isCast(CE->getOpcode())) { 953 Code = bitc::CST_CODE_CE_CAST; 954 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 955 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 956 Record.push_back(VE.getValueID(C->getOperand(0))); 957 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 958 } else { 959 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 960 Code = bitc::CST_CODE_CE_BINOP; 961 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 962 Record.push_back(VE.getValueID(C->getOperand(0))); 963 Record.push_back(VE.getValueID(C->getOperand(1))); 964 uint64_t Flags = GetOptimizationFlags(CE); 965 if (Flags != 0) 966 Record.push_back(Flags); 967 } 968 break; 969 case Instruction::GetElementPtr: 970 Code = bitc::CST_CODE_CE_GEP; 971 if (cast<GEPOperator>(C)->isInBounds()) 972 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 973 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 974 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 975 Record.push_back(VE.getValueID(C->getOperand(i))); 976 } 977 break; 978 case Instruction::Select: 979 Code = bitc::CST_CODE_CE_SELECT; 980 Record.push_back(VE.getValueID(C->getOperand(0))); 981 Record.push_back(VE.getValueID(C->getOperand(1))); 982 Record.push_back(VE.getValueID(C->getOperand(2))); 983 break; 984 case Instruction::ExtractElement: 985 Code = bitc::CST_CODE_CE_EXTRACTELT; 986 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 987 Record.push_back(VE.getValueID(C->getOperand(0))); 988 Record.push_back(VE.getValueID(C->getOperand(1))); 989 break; 990 case Instruction::InsertElement: 991 Code = bitc::CST_CODE_CE_INSERTELT; 992 Record.push_back(VE.getValueID(C->getOperand(0))); 993 Record.push_back(VE.getValueID(C->getOperand(1))); 994 Record.push_back(VE.getValueID(C->getOperand(2))); 995 break; 996 case Instruction::ShuffleVector: 997 // If the return type and argument types are the same, this is a 998 // standard shufflevector instruction. If the types are different, 999 // then the shuffle is widening or truncating the input vectors, and 1000 // the argument type must also be encoded. 1001 if (C->getType() == C->getOperand(0)->getType()) { 1002 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 1003 } else { 1004 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 1005 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1006 } 1007 Record.push_back(VE.getValueID(C->getOperand(0))); 1008 Record.push_back(VE.getValueID(C->getOperand(1))); 1009 Record.push_back(VE.getValueID(C->getOperand(2))); 1010 break; 1011 case Instruction::ICmp: 1012 case Instruction::FCmp: 1013 Code = bitc::CST_CODE_CE_CMP; 1014 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 1015 Record.push_back(VE.getValueID(C->getOperand(0))); 1016 Record.push_back(VE.getValueID(C->getOperand(1))); 1017 Record.push_back(CE->getPredicate()); 1018 break; 1019 } 1020 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) { 1021 Code = bitc::CST_CODE_BLOCKADDRESS; 1022 Record.push_back(VE.getTypeID(BA->getFunction()->getType())); 1023 Record.push_back(VE.getValueID(BA->getFunction())); 1024 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock())); 1025 } else { 1026#ifndef NDEBUG 1027 C->dump(); 1028#endif 1029 llvm_unreachable("Unknown constant!"); 1030 } 1031 Stream.EmitRecord(Code, Record, AbbrevToUse); 1032 Record.clear(); 1033 } 1034 1035 Stream.ExitBlock(); 1036} 1037 1038static void WriteModuleConstants(const ValueEnumerator &VE, 1039 BitstreamWriter &Stream) { 1040 const ValueEnumerator::ValueList &Vals = VE.getValues(); 1041 1042 // Find the first constant to emit, which is the first non-globalvalue value. 1043 // We know globalvalues have been emitted by WriteModuleInfo. 1044 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 1045 if (!isa<GlobalValue>(Vals[i].first)) { 1046 WriteConstants(i, Vals.size(), VE, Stream, true); 1047 return; 1048 } 1049 } 1050} 1051 1052/// PushValueAndType - The file has to encode both the value and type id for 1053/// many values, because we need to know what type to create for forward 1054/// references. However, most operands are not forward references, so this type 1055/// field is not needed. 1056/// 1057/// This function adds V's value ID to Vals. If the value ID is higher than the 1058/// instruction ID, then it is a forward reference, and it also includes the 1059/// type ID. The value ID that is written is encoded relative to the InstID. 1060static bool PushValueAndType(const Value *V, unsigned InstID, 1061 SmallVector<unsigned, 64> &Vals, 1062 ValueEnumerator &VE) { 1063 unsigned ValID = VE.getValueID(V); 1064 // Make encoding relative to the InstID. 1065 Vals.push_back(InstID - ValID); 1066 if (ValID >= InstID) { 1067 Vals.push_back(VE.getTypeID(V->getType())); 1068 return true; 1069 } 1070 return false; 1071} 1072 1073/// pushValue - Like PushValueAndType, but where the type of the value is 1074/// omitted (perhaps it was already encoded in an earlier operand). 1075static void pushValue(const Value *V, unsigned InstID, 1076 SmallVector<unsigned, 64> &Vals, 1077 ValueEnumerator &VE) { 1078 unsigned ValID = VE.getValueID(V); 1079 Vals.push_back(InstID - ValID); 1080} 1081 1082static void pushValue64(const Value *V, unsigned InstID, 1083 SmallVector<uint64_t, 128> &Vals, 1084 ValueEnumerator &VE) { 1085 uint64_t ValID = VE.getValueID(V); 1086 Vals.push_back(InstID - ValID); 1087} 1088 1089static void pushValueSigned(const Value *V, unsigned InstID, 1090 SmallVector<uint64_t, 128> &Vals, 1091 ValueEnumerator &VE) { 1092 unsigned ValID = VE.getValueID(V); 1093 int64_t diff = ((int32_t)InstID - (int32_t)ValID); 1094 emitSignedInt64(Vals, diff); 1095} 1096 1097/// WriteInstruction - Emit an instruction to the specified stream. 1098static void WriteInstruction(const Instruction &I, unsigned InstID, 1099 ValueEnumerator &VE, BitstreamWriter &Stream, 1100 SmallVector<unsigned, 64> &Vals) { 1101 unsigned Code = 0; 1102 unsigned AbbrevToUse = 0; 1103 VE.setInstructionID(&I); 1104 switch (I.getOpcode()) { 1105 default: 1106 if (Instruction::isCast(I.getOpcode())) { 1107 Code = bitc::FUNC_CODE_INST_CAST; 1108 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1109 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 1110 Vals.push_back(VE.getTypeID(I.getType())); 1111 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 1112 } else { 1113 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 1114 Code = bitc::FUNC_CODE_INST_BINOP; 1115 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1116 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 1117 pushValue(I.getOperand(1), InstID, Vals, VE); 1118 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 1119 uint64_t Flags = GetOptimizationFlags(&I); 1120 if (Flags != 0) { 1121 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 1122 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 1123 Vals.push_back(Flags); 1124 } 1125 } 1126 break; 1127 1128 case Instruction::GetElementPtr: 1129 Code = bitc::FUNC_CODE_INST_GEP; 1130 if (cast<GEPOperator>(&I)->isInBounds()) 1131 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 1132 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 1133 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1134 break; 1135 case Instruction::ExtractValue: { 1136 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 1137 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1138 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 1139 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 1140 Vals.push_back(*i); 1141 break; 1142 } 1143 case Instruction::InsertValue: { 1144 Code = bitc::FUNC_CODE_INST_INSERTVAL; 1145 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1146 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1147 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 1148 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 1149 Vals.push_back(*i); 1150 break; 1151 } 1152 case Instruction::Select: 1153 Code = bitc::FUNC_CODE_INST_VSELECT; 1154 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 1155 pushValue(I.getOperand(2), InstID, Vals, VE); 1156 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1157 break; 1158 case Instruction::ExtractElement: 1159 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 1160 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1161 pushValue(I.getOperand(1), InstID, Vals, VE); 1162 break; 1163 case Instruction::InsertElement: 1164 Code = bitc::FUNC_CODE_INST_INSERTELT; 1165 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1166 pushValue(I.getOperand(1), InstID, Vals, VE); 1167 pushValue(I.getOperand(2), InstID, Vals, VE); 1168 break; 1169 case Instruction::ShuffleVector: 1170 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 1171 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1172 pushValue(I.getOperand(1), InstID, Vals, VE); 1173 pushValue(I.getOperand(2), InstID, Vals, VE); 1174 break; 1175 case Instruction::ICmp: 1176 case Instruction::FCmp: 1177 // compare returning Int1Ty or vector of Int1Ty 1178 Code = bitc::FUNC_CODE_INST_CMP2; 1179 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1180 pushValue(I.getOperand(1), InstID, Vals, VE); 1181 Vals.push_back(cast<CmpInst>(I).getPredicate()); 1182 break; 1183 1184 case Instruction::Ret: 1185 { 1186 Code = bitc::FUNC_CODE_INST_RET; 1187 unsigned NumOperands = I.getNumOperands(); 1188 if (NumOperands == 0) 1189 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 1190 else if (NumOperands == 1) { 1191 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 1192 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 1193 } else { 1194 for (unsigned i = 0, e = NumOperands; i != e; ++i) 1195 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 1196 } 1197 } 1198 break; 1199 case Instruction::Br: 1200 { 1201 Code = bitc::FUNC_CODE_INST_BR; 1202 BranchInst &II = cast<BranchInst>(I); 1203 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 1204 if (II.isConditional()) { 1205 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 1206 pushValue(II.getCondition(), InstID, Vals, VE); 1207 } 1208 } 1209 break; 1210 case Instruction::Switch: 1211 { 1212 // Redefine Vals, since here we need to use 64 bit values 1213 // explicitly to store large APInt numbers. 1214 SmallVector<uint64_t, 128> Vals64; 1215 1216 Code = bitc::FUNC_CODE_INST_SWITCH; 1217 SwitchInst &SI = cast<SwitchInst>(I); 1218 1219 uint32_t SwitchRecordHeader = SI.hash() | (SWITCH_INST_MAGIC << 16); 1220 Vals64.push_back(SwitchRecordHeader); 1221 1222 Vals64.push_back(VE.getTypeID(SI.getCondition()->getType())); 1223 pushValue64(SI.getCondition(), InstID, Vals64, VE); 1224 Vals64.push_back(VE.getValueID(SI.getDefaultDest())); 1225 Vals64.push_back(SI.getNumCases()); 1226 for (SwitchInst::CaseIt i = SI.case_begin(), e = SI.case_end(); 1227 i != e; ++i) { 1228 IntegersSubset& CaseRanges = i.getCaseValueEx(); 1229 unsigned Code, Abbrev; // will unused. 1230 1231 if (CaseRanges.isSingleNumber()) { 1232 Vals64.push_back(1/*NumItems = 1*/); 1233 Vals64.push_back(true/*IsSingleNumber = true*/); 1234 EmitAPInt(Vals64, Code, Abbrev, CaseRanges.getSingleNumber(0), true); 1235 } else { 1236 1237 Vals64.push_back(CaseRanges.getNumItems()); 1238 1239 if (CaseRanges.isSingleNumbersOnly()) { 1240 for (unsigned ri = 0, rn = CaseRanges.getNumItems(); 1241 ri != rn; ++ri) { 1242 1243 Vals64.push_back(true/*IsSingleNumber = true*/); 1244 1245 EmitAPInt(Vals64, Code, Abbrev, 1246 CaseRanges.getSingleNumber(ri), true); 1247 } 1248 } else 1249 for (unsigned ri = 0, rn = CaseRanges.getNumItems(); 1250 ri != rn; ++ri) { 1251 IntegersSubset::Range r = CaseRanges.getItem(ri); 1252 bool IsSingleNumber = CaseRanges.isSingleNumber(ri); 1253 1254 Vals64.push_back(IsSingleNumber); 1255 1256 EmitAPInt(Vals64, Code, Abbrev, r.getLow(), true); 1257 if (!IsSingleNumber) 1258 EmitAPInt(Vals64, Code, Abbrev, r.getHigh(), true); 1259 } 1260 } 1261 Vals64.push_back(VE.getValueID(i.getCaseSuccessor())); 1262 } 1263 1264 Stream.EmitRecord(Code, Vals64, AbbrevToUse); 1265 1266 // Also do expected action - clear external Vals collection: 1267 Vals.clear(); 1268 return; 1269 } 1270 break; 1271 case Instruction::IndirectBr: 1272 Code = bitc::FUNC_CODE_INST_INDIRECTBR; 1273 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1274 // Encode the address operand as relative, but not the basic blocks. 1275 pushValue(I.getOperand(0), InstID, Vals, VE); 1276 for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) 1277 Vals.push_back(VE.getValueID(I.getOperand(i))); 1278 break; 1279 1280 case Instruction::Invoke: { 1281 const InvokeInst *II = cast<InvokeInst>(&I); 1282 const Value *Callee(II->getCalledValue()); 1283 PointerType *PTy = cast<PointerType>(Callee->getType()); 1284 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1285 Code = bitc::FUNC_CODE_INST_INVOKE; 1286 1287 Vals.push_back(VE.getAttributeID(II->getAttributes())); 1288 Vals.push_back(II->getCallingConv()); 1289 Vals.push_back(VE.getValueID(II->getNormalDest())); 1290 Vals.push_back(VE.getValueID(II->getUnwindDest())); 1291 PushValueAndType(Callee, InstID, Vals, VE); 1292 1293 // Emit value #'s for the fixed parameters. 1294 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1295 pushValue(I.getOperand(i), InstID, Vals, VE); // fixed param. 1296 1297 // Emit type/value pairs for varargs params. 1298 if (FTy->isVarArg()) { 1299 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3; 1300 i != e; ++i) 1301 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 1302 } 1303 break; 1304 } 1305 case Instruction::Resume: 1306 Code = bitc::FUNC_CODE_INST_RESUME; 1307 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1308 break; 1309 case Instruction::Unreachable: 1310 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 1311 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 1312 break; 1313 1314 case Instruction::PHI: { 1315 const PHINode &PN = cast<PHINode>(I); 1316 Code = bitc::FUNC_CODE_INST_PHI; 1317 // With the newer instruction encoding, forward references could give 1318 // negative valued IDs. This is most common for PHIs, so we use 1319 // signed VBRs. 1320 SmallVector<uint64_t, 128> Vals64; 1321 Vals64.push_back(VE.getTypeID(PN.getType())); 1322 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { 1323 pushValueSigned(PN.getIncomingValue(i), InstID, Vals64, VE); 1324 Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i))); 1325 } 1326 // Emit a Vals64 vector and exit. 1327 Stream.EmitRecord(Code, Vals64, AbbrevToUse); 1328 Vals64.clear(); 1329 return; 1330 } 1331 1332 case Instruction::LandingPad: { 1333 const LandingPadInst &LP = cast<LandingPadInst>(I); 1334 Code = bitc::FUNC_CODE_INST_LANDINGPAD; 1335 Vals.push_back(VE.getTypeID(LP.getType())); 1336 PushValueAndType(LP.getPersonalityFn(), InstID, Vals, VE); 1337 Vals.push_back(LP.isCleanup()); 1338 Vals.push_back(LP.getNumClauses()); 1339 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) { 1340 if (LP.isCatch(I)) 1341 Vals.push_back(LandingPadInst::Catch); 1342 else 1343 Vals.push_back(LandingPadInst::Filter); 1344 PushValueAndType(LP.getClause(I), InstID, Vals, VE); 1345 } 1346 break; 1347 } 1348 1349 case Instruction::Alloca: 1350 Code = bitc::FUNC_CODE_INST_ALLOCA; 1351 Vals.push_back(VE.getTypeID(I.getType())); 1352 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 1353 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 1354 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 1355 break; 1356 1357 case Instruction::Load: 1358 if (cast<LoadInst>(I).isAtomic()) { 1359 Code = bitc::FUNC_CODE_INST_LOADATOMIC; 1360 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 1361 } else { 1362 Code = bitc::FUNC_CODE_INST_LOAD; 1363 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 1364 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 1365 } 1366 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 1367 Vals.push_back(cast<LoadInst>(I).isVolatile()); 1368 if (cast<LoadInst>(I).isAtomic()) { 1369 Vals.push_back(GetEncodedOrdering(cast<LoadInst>(I).getOrdering())); 1370 Vals.push_back(GetEncodedSynchScope(cast<LoadInst>(I).getSynchScope())); 1371 } 1372 break; 1373 case Instruction::Store: 1374 if (cast<StoreInst>(I).isAtomic()) 1375 Code = bitc::FUNC_CODE_INST_STOREATOMIC; 1376 else 1377 Code = bitc::FUNC_CODE_INST_STORE; 1378 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 1379 pushValue(I.getOperand(0), InstID, Vals, VE); // val. 1380 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 1381 Vals.push_back(cast<StoreInst>(I).isVolatile()); 1382 if (cast<StoreInst>(I).isAtomic()) { 1383 Vals.push_back(GetEncodedOrdering(cast<StoreInst>(I).getOrdering())); 1384 Vals.push_back(GetEncodedSynchScope(cast<StoreInst>(I).getSynchScope())); 1385 } 1386 break; 1387 case Instruction::AtomicCmpXchg: 1388 Code = bitc::FUNC_CODE_INST_CMPXCHG; 1389 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1390 pushValue(I.getOperand(1), InstID, Vals, VE); // cmp. 1391 pushValue(I.getOperand(2), InstID, Vals, VE); // newval. 1392 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile()); 1393 Vals.push_back(GetEncodedOrdering( 1394 cast<AtomicCmpXchgInst>(I).getOrdering())); 1395 Vals.push_back(GetEncodedSynchScope( 1396 cast<AtomicCmpXchgInst>(I).getSynchScope())); 1397 break; 1398 case Instruction::AtomicRMW: 1399 Code = bitc::FUNC_CODE_INST_ATOMICRMW; 1400 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr 1401 pushValue(I.getOperand(1), InstID, Vals, VE); // val. 1402 Vals.push_back(GetEncodedRMWOperation( 1403 cast<AtomicRMWInst>(I).getOperation())); 1404 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile()); 1405 Vals.push_back(GetEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering())); 1406 Vals.push_back(GetEncodedSynchScope( 1407 cast<AtomicRMWInst>(I).getSynchScope())); 1408 break; 1409 case Instruction::Fence: 1410 Code = bitc::FUNC_CODE_INST_FENCE; 1411 Vals.push_back(GetEncodedOrdering(cast<FenceInst>(I).getOrdering())); 1412 Vals.push_back(GetEncodedSynchScope(cast<FenceInst>(I).getSynchScope())); 1413 break; 1414 case Instruction::Call: { 1415 const CallInst &CI = cast<CallInst>(I); 1416 PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType()); 1417 FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1418 1419 Code = bitc::FUNC_CODE_INST_CALL; 1420 1421 Vals.push_back(VE.getAttributeID(CI.getAttributes())); 1422 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall())); 1423 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee 1424 1425 // Emit value #'s for the fixed parameters. 1426 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 1427 // Check for labels (can happen with asm labels). 1428 if (FTy->getParamType(i)->isLabelTy()) 1429 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); 1430 else 1431 pushValue(CI.getArgOperand(i), InstID, Vals, VE); // fixed param. 1432 } 1433 1434 // Emit type/value pairs for varargs params. 1435 if (FTy->isVarArg()) { 1436 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands(); 1437 i != e; ++i) 1438 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs 1439 } 1440 break; 1441 } 1442 case Instruction::VAArg: 1443 Code = bitc::FUNC_CODE_INST_VAARG; 1444 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1445 pushValue(I.getOperand(0), InstID, Vals, VE); // valist. 1446 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1447 break; 1448 } 1449 1450 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1451 Vals.clear(); 1452} 1453 1454// Emit names for globals/functions etc. 1455static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1456 const ValueEnumerator &VE, 1457 BitstreamWriter &Stream) { 1458 if (VST.empty()) return; 1459 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1460 1461 // FIXME: Set up the abbrev, we know how many values there are! 1462 // FIXME: We know if the type names can use 7-bit ascii. 1463 SmallVector<unsigned, 64> NameVals; 1464 1465 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1466 SI != SE; ++SI) { 1467 1468 const ValueName &Name = *SI; 1469 1470 // Figure out the encoding to use for the name. 1471 bool is7Bit = true; 1472 bool isChar6 = true; 1473 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1474 C != E; ++C) { 1475 if (isChar6) 1476 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1477 if ((unsigned char)*C & 128) { 1478 is7Bit = false; 1479 break; // don't bother scanning the rest. 1480 } 1481 } 1482 1483 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1484 1485 // VST_ENTRY: [valueid, namechar x N] 1486 // VST_BBENTRY: [bbid, namechar x N] 1487 unsigned Code; 1488 if (isa<BasicBlock>(SI->getValue())) { 1489 Code = bitc::VST_CODE_BBENTRY; 1490 if (isChar6) 1491 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1492 } else { 1493 Code = bitc::VST_CODE_ENTRY; 1494 if (isChar6) 1495 AbbrevToUse = VST_ENTRY_6_ABBREV; 1496 else if (is7Bit) 1497 AbbrevToUse = VST_ENTRY_7_ABBREV; 1498 } 1499 1500 NameVals.push_back(VE.getValueID(SI->getValue())); 1501 for (const char *P = Name.getKeyData(), 1502 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1503 NameVals.push_back((unsigned char)*P); 1504 1505 // Emit the finished record. 1506 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1507 NameVals.clear(); 1508 } 1509 Stream.ExitBlock(); 1510} 1511 1512/// WriteFunction - Emit a function body to the module stream. 1513static void WriteFunction(const Function &F, ValueEnumerator &VE, 1514 BitstreamWriter &Stream) { 1515 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1516 VE.incorporateFunction(F); 1517 1518 SmallVector<unsigned, 64> Vals; 1519 1520 // Emit the number of basic blocks, so the reader can create them ahead of 1521 // time. 1522 Vals.push_back(VE.getBasicBlocks().size()); 1523 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1524 Vals.clear(); 1525 1526 // If there are function-local constants, emit them now. 1527 unsigned CstStart, CstEnd; 1528 VE.getFunctionConstantRange(CstStart, CstEnd); 1529 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1530 1531 // If there is function-local metadata, emit it now. 1532 WriteFunctionLocalMetadata(F, VE, Stream); 1533 1534 // Keep a running idea of what the instruction ID is. 1535 unsigned InstID = CstEnd; 1536 1537 bool NeedsMetadataAttachment = false; 1538 1539 DebugLoc LastDL; 1540 1541 // Finally, emit all the instructions, in order. 1542 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1543 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1544 I != E; ++I) { 1545 WriteInstruction(*I, InstID, VE, Stream, Vals); 1546 1547 if (!I->getType()->isVoidTy()) 1548 ++InstID; 1549 1550 // If the instruction has metadata, write a metadata attachment later. 1551 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc(); 1552 1553 // If the instruction has a debug location, emit it. 1554 DebugLoc DL = I->getDebugLoc(); 1555 if (DL.isUnknown()) { 1556 // nothing todo. 1557 } else if (DL == LastDL) { 1558 // Just repeat the same debug loc as last time. 1559 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals); 1560 } else { 1561 MDNode *Scope, *IA; 1562 DL.getScopeAndInlinedAt(Scope, IA, I->getContext()); 1563 1564 Vals.push_back(DL.getLine()); 1565 Vals.push_back(DL.getCol()); 1566 Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0); 1567 Vals.push_back(IA ? VE.getValueID(IA)+1 : 0); 1568 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals); 1569 Vals.clear(); 1570 1571 LastDL = DL; 1572 } 1573 } 1574 1575 // Emit names for all the instructions etc. 1576 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1577 1578 if (NeedsMetadataAttachment) 1579 WriteMetadataAttachment(F, VE, Stream); 1580 VE.purgeFunction(); 1581 Stream.ExitBlock(); 1582} 1583 1584// Emit blockinfo, which defines the standard abbreviations etc. 1585static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) { 1586 // We only want to emit block info records for blocks that have multiple 1587 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. 1588 // Other blocks can define their abbrevs inline. 1589 Stream.EnterBlockInfoBlock(2); 1590 1591 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1592 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1593 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1594 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1595 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1596 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1597 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1598 Abbv) != VST_ENTRY_8_ABBREV) 1599 llvm_unreachable("Unexpected abbrev ordering!"); 1600 } 1601 1602 { // 7-bit fixed width VST_ENTRY strings. 1603 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1604 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1605 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1606 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1607 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1608 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1609 Abbv) != VST_ENTRY_7_ABBREV) 1610 llvm_unreachable("Unexpected abbrev ordering!"); 1611 } 1612 { // 6-bit char6 VST_ENTRY strings. 1613 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1614 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1615 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1616 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1617 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1618 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1619 Abbv) != VST_ENTRY_6_ABBREV) 1620 llvm_unreachable("Unexpected abbrev ordering!"); 1621 } 1622 { // 6-bit char6 VST_BBENTRY strings. 1623 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1624 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1625 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1626 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1627 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1628 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1629 Abbv) != VST_BBENTRY_6_ABBREV) 1630 llvm_unreachable("Unexpected abbrev ordering!"); 1631 } 1632 1633 1634 1635 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1636 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1637 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1638 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1639 Log2_32_Ceil(VE.getTypes().size()+1))); 1640 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1641 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1642 llvm_unreachable("Unexpected abbrev ordering!"); 1643 } 1644 1645 { // INTEGER abbrev for CONSTANTS_BLOCK. 1646 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1647 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1648 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1649 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1650 Abbv) != CONSTANTS_INTEGER_ABBREV) 1651 llvm_unreachable("Unexpected abbrev ordering!"); 1652 } 1653 1654 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1655 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1656 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1657 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1658 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1659 Log2_32_Ceil(VE.getTypes().size()+1))); 1660 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1661 1662 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1663 Abbv) != CONSTANTS_CE_CAST_Abbrev) 1664 llvm_unreachable("Unexpected abbrev ordering!"); 1665 } 1666 { // NULL abbrev for CONSTANTS_BLOCK. 1667 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1668 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 1669 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1670 Abbv) != CONSTANTS_NULL_Abbrev) 1671 llvm_unreachable("Unexpected abbrev ordering!"); 1672 } 1673 1674 // FIXME: This should only use space for first class types! 1675 1676 { // INST_LOAD abbrev for FUNCTION_BLOCK. 1677 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1678 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 1679 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 1680 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 1681 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 1682 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1683 Abbv) != FUNCTION_INST_LOAD_ABBREV) 1684 llvm_unreachable("Unexpected abbrev ordering!"); 1685 } 1686 { // INST_BINOP abbrev for FUNCTION_BLOCK. 1687 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1688 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1689 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1690 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1691 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1692 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1693 Abbv) != FUNCTION_INST_BINOP_ABBREV) 1694 llvm_unreachable("Unexpected abbrev ordering!"); 1695 } 1696 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 1697 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1698 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1699 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1700 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1701 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1702 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 1703 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1704 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 1705 llvm_unreachable("Unexpected abbrev ordering!"); 1706 } 1707 { // INST_CAST abbrev for FUNCTION_BLOCK. 1708 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1709 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 1710 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 1711 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 1712 Log2_32_Ceil(VE.getTypes().size()+1))); 1713 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1714 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1715 Abbv) != FUNCTION_INST_CAST_ABBREV) 1716 llvm_unreachable("Unexpected abbrev ordering!"); 1717 } 1718 1719 { // INST_RET abbrev for FUNCTION_BLOCK. 1720 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1721 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1722 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1723 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 1724 llvm_unreachable("Unexpected abbrev ordering!"); 1725 } 1726 { // INST_RET abbrev for FUNCTION_BLOCK. 1727 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1728 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1729 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 1730 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1731 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 1732 llvm_unreachable("Unexpected abbrev ordering!"); 1733 } 1734 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 1735 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1736 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 1737 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1738 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 1739 llvm_unreachable("Unexpected abbrev ordering!"); 1740 } 1741 1742 Stream.ExitBlock(); 1743} 1744 1745// Sort the Users based on the order in which the reader parses the bitcode 1746// file. 1747static bool bitcodereader_order(const User *lhs, const User *rhs) { 1748 // TODO: Implement. 1749 return true; 1750} 1751 1752static void WriteUseList(const Value *V, const ValueEnumerator &VE, 1753 BitstreamWriter &Stream) { 1754 1755 // One or zero uses can't get out of order. 1756 if (V->use_empty() || V->hasNUses(1)) 1757 return; 1758 1759 // Make a copy of the in-memory use-list for sorting. 1760 unsigned UseListSize = std::distance(V->use_begin(), V->use_end()); 1761 SmallVector<const User*, 8> UseList; 1762 UseList.reserve(UseListSize); 1763 for (Value::const_use_iterator I = V->use_begin(), E = V->use_end(); 1764 I != E; ++I) { 1765 const User *U = *I; 1766 UseList.push_back(U); 1767 } 1768 1769 // Sort the copy based on the order read by the BitcodeReader. 1770 std::sort(UseList.begin(), UseList.end(), bitcodereader_order); 1771 1772 // TODO: Generate a diff between the BitcodeWriter in-memory use-list and the 1773 // sorted list (i.e., the expected BitcodeReader in-memory use-list). 1774 1775 // TODO: Emit the USELIST_CODE_ENTRYs. 1776} 1777 1778static void WriteFunctionUseList(const Function *F, ValueEnumerator &VE, 1779 BitstreamWriter &Stream) { 1780 VE.incorporateFunction(*F); 1781 1782 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end(); 1783 AI != AE; ++AI) 1784 WriteUseList(AI, VE, Stream); 1785 for (Function::const_iterator BB = F->begin(), FE = F->end(); BB != FE; 1786 ++BB) { 1787 WriteUseList(BB, VE, Stream); 1788 for (BasicBlock::const_iterator II = BB->begin(), IE = BB->end(); II != IE; 1789 ++II) { 1790 WriteUseList(II, VE, Stream); 1791 for (User::const_op_iterator OI = II->op_begin(), E = II->op_end(); 1792 OI != E; ++OI) { 1793 if ((isa<Constant>(*OI) && !isa<GlobalValue>(*OI)) || 1794 isa<InlineAsm>(*OI)) 1795 WriteUseList(*OI, VE, Stream); 1796 } 1797 } 1798 } 1799 VE.purgeFunction(); 1800} 1801 1802// Emit use-lists. 1803static void WriteModuleUseLists(const Module *M, ValueEnumerator &VE, 1804 BitstreamWriter &Stream) { 1805 Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3); 1806 1807 // XXX: this modifies the module, but in a way that should never change the 1808 // behavior of any pass or codegen in LLVM. The problem is that GVs may 1809 // contain entries in the use_list that do not exist in the Module and are 1810 // not stored in the .bc file. 1811 for (Module::const_global_iterator I = M->global_begin(), E = M->global_end(); 1812 I != E; ++I) 1813 I->removeDeadConstantUsers(); 1814 1815 // Write the global variables. 1816 for (Module::const_global_iterator GI = M->global_begin(), 1817 GE = M->global_end(); GI != GE; ++GI) { 1818 WriteUseList(GI, VE, Stream); 1819 1820 // Write the global variable initializers. 1821 if (GI->hasInitializer()) 1822 WriteUseList(GI->getInitializer(), VE, Stream); 1823 } 1824 1825 // Write the functions. 1826 for (Module::const_iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) { 1827 WriteUseList(FI, VE, Stream); 1828 if (!FI->isDeclaration()) 1829 WriteFunctionUseList(FI, VE, Stream); 1830 } 1831 1832 // Write the aliases. 1833 for (Module::const_alias_iterator AI = M->alias_begin(), AE = M->alias_end(); 1834 AI != AE; ++AI) { 1835 WriteUseList(AI, VE, Stream); 1836 WriteUseList(AI->getAliasee(), VE, Stream); 1837 } 1838 1839 Stream.ExitBlock(); 1840} 1841 1842/// WriteModule - Emit the specified module to the bitstream. 1843static void WriteModule(const Module *M, BitstreamWriter &Stream) { 1844 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 1845 1846 SmallVector<unsigned, 1> Vals; 1847 unsigned CurVersion = 1; 1848 Vals.push_back(CurVersion); 1849 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 1850 1851 // Analyze the module, enumerating globals, functions, etc. 1852 ValueEnumerator VE(M); 1853 1854 // Emit blockinfo, which defines the standard abbreviations etc. 1855 WriteBlockInfo(VE, Stream); 1856 1857 // Emit information about parameter attributes. 1858 WriteAttributeTable(VE, Stream); 1859 1860 // Emit information describing all of the types in the module. 1861 WriteTypeTable(VE, Stream); 1862 1863 // Emit top-level description of module, including target triple, inline asm, 1864 // descriptors for global variables, and function prototype info. 1865 WriteModuleInfo(M, VE, Stream); 1866 1867 // Emit constants. 1868 WriteModuleConstants(VE, Stream); 1869 1870 // Emit metadata. 1871 WriteModuleMetadata(M, VE, Stream); 1872 1873 // Emit metadata. 1874 WriteModuleMetadataStore(M, Stream); 1875 1876 // Emit names for globals/functions etc. 1877 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 1878 1879 // Emit use-lists. 1880 if (EnablePreserveUseListOrdering) 1881 WriteModuleUseLists(M, VE, Stream); 1882 1883 // Emit function bodies. 1884 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) 1885 if (!F->isDeclaration()) 1886 WriteFunction(*F, VE, Stream); 1887 1888 Stream.ExitBlock(); 1889} 1890 1891/// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 1892/// header and trailer to make it compatible with the system archiver. To do 1893/// this we emit the following header, and then emit a trailer that pads the 1894/// file out to be a multiple of 16 bytes. 1895/// 1896/// struct bc_header { 1897/// uint32_t Magic; // 0x0B17C0DE 1898/// uint32_t Version; // Version, currently always 0. 1899/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 1900/// uint32_t BitcodeSize; // Size of traditional bitcode file. 1901/// uint32_t CPUType; // CPU specifier. 1902/// ... potentially more later ... 1903/// }; 1904enum { 1905 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 1906 DarwinBCHeaderSize = 5*4 1907}; 1908 1909static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer, 1910 uint32_t &Position) { 1911 Buffer[Position + 0] = (unsigned char) (Value >> 0); 1912 Buffer[Position + 1] = (unsigned char) (Value >> 8); 1913 Buffer[Position + 2] = (unsigned char) (Value >> 16); 1914 Buffer[Position + 3] = (unsigned char) (Value >> 24); 1915 Position += 4; 1916} 1917 1918static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer, 1919 const Triple &TT) { 1920 unsigned CPUType = ~0U; 1921 1922 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*, 1923 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic 1924 // number from /usr/include/mach/machine.h. It is ok to reproduce the 1925 // specific constants here because they are implicitly part of the Darwin ABI. 1926 enum { 1927 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 1928 DARWIN_CPU_TYPE_X86 = 7, 1929 DARWIN_CPU_TYPE_ARM = 12, 1930 DARWIN_CPU_TYPE_POWERPC = 18 1931 }; 1932 1933 Triple::ArchType Arch = TT.getArch(); 1934 if (Arch == Triple::x86_64) 1935 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 1936 else if (Arch == Triple::x86) 1937 CPUType = DARWIN_CPU_TYPE_X86; 1938 else if (Arch == Triple::ppc) 1939 CPUType = DARWIN_CPU_TYPE_POWERPC; 1940 else if (Arch == Triple::ppc64) 1941 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 1942 else if (Arch == Triple::arm || Arch == Triple::thumb) 1943 CPUType = DARWIN_CPU_TYPE_ARM; 1944 1945 // Traditional Bitcode starts after header. 1946 assert(Buffer.size() >= DarwinBCHeaderSize && 1947 "Expected header size to be reserved"); 1948 unsigned BCOffset = DarwinBCHeaderSize; 1949 unsigned BCSize = Buffer.size()-DarwinBCHeaderSize; 1950 1951 // Write the magic and version. 1952 unsigned Position = 0; 1953 WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position); 1954 WriteInt32ToBuffer(0 , Buffer, Position); // Version. 1955 WriteInt32ToBuffer(BCOffset , Buffer, Position); 1956 WriteInt32ToBuffer(BCSize , Buffer, Position); 1957 WriteInt32ToBuffer(CPUType , Buffer, Position); 1958 1959 // If the file is not a multiple of 16 bytes, insert dummy padding. 1960 while (Buffer.size() & 15) 1961 Buffer.push_back(0); 1962} 1963 1964/// WriteBitcodeToFile - Write the specified module to the specified output 1965/// stream. 1966void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 1967 SmallVector<char, 0> Buffer; 1968 Buffer.reserve(256*1024); 1969 1970 // If this is darwin or another generic macho target, reserve space for the 1971 // header. 1972 Triple TT(M->getTargetTriple()); 1973 if (TT.isOSDarwin()) 1974 Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0); 1975 1976 // Emit the module into the buffer. 1977 { 1978 BitstreamWriter Stream(Buffer); 1979 1980 // Emit the file header. 1981 Stream.Emit((unsigned)'B', 8); 1982 Stream.Emit((unsigned)'C', 8); 1983 Stream.Emit(0x0, 4); 1984 Stream.Emit(0xC, 4); 1985 Stream.Emit(0xE, 4); 1986 Stream.Emit(0xD, 4); 1987 1988 // Emit the module. 1989 WriteModule(M, Stream); 1990 } 1991 1992 if (TT.isOSDarwin()) 1993 EmitDarwinBCHeaderAndTrailer(Buffer, TT); 1994 1995 // Write the generated bitstream to "Out". 1996 Out.write((char*)&Buffer.front(), Buffer.size()); 1997} 1998