BitcodeWriter.cpp revision 985fea2f1ae90eded83dac1006d93a8d2c9a4a62
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 "llvm/Bitcode/BitstreamWriter.h" 16#include "llvm/Bitcode/LLVMBitCodes.h" 17#include "ValueEnumerator.h" 18#include "llvm/Constants.h" 19#include "llvm/DerivedTypes.h" 20#include "llvm/InlineAsm.h" 21#include "llvm/Instructions.h" 22#include "llvm/Metadata.h" 23#include "llvm/Module.h" 24#include "llvm/Operator.h" 25#include "llvm/TypeSymbolTable.h" 26#include "llvm/ValueSymbolTable.h" 27#include "llvm/Support/ErrorHandling.h" 28#include "llvm/Support/MathExtras.h" 29#include "llvm/Support/Streams.h" 30#include "llvm/Support/raw_ostream.h" 31#include "llvm/System/Program.h" 32using namespace llvm; 33 34/// These are manifest constants used by the bitcode writer. They do not need to 35/// be kept in sync with the reader, but need to be consistent within this file. 36enum { 37 CurVersion = 0, 38 39 // VALUE_SYMTAB_BLOCK abbrev id's. 40 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 41 VST_ENTRY_7_ABBREV, 42 VST_ENTRY_6_ABBREV, 43 VST_BBENTRY_6_ABBREV, 44 45 // CONSTANTS_BLOCK abbrev id's. 46 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 47 CONSTANTS_INTEGER_ABBREV, 48 CONSTANTS_CE_CAST_Abbrev, 49 CONSTANTS_NULL_Abbrev, 50 51 // FUNCTION_BLOCK abbrev id's. 52 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 53 FUNCTION_INST_BINOP_ABBREV, 54 FUNCTION_INST_BINOP_FLAGS_ABBREV, 55 FUNCTION_INST_CAST_ABBREV, 56 FUNCTION_INST_RET_VOID_ABBREV, 57 FUNCTION_INST_RET_VAL_ABBREV, 58 FUNCTION_INST_UNREACHABLE_ABBREV 59}; 60 61 62static unsigned GetEncodedCastOpcode(unsigned Opcode) { 63 switch (Opcode) { 64 default: llvm_unreachable("Unknown cast instruction!"); 65 case Instruction::Trunc : return bitc::CAST_TRUNC; 66 case Instruction::ZExt : return bitc::CAST_ZEXT; 67 case Instruction::SExt : return bitc::CAST_SEXT; 68 case Instruction::FPToUI : return bitc::CAST_FPTOUI; 69 case Instruction::FPToSI : return bitc::CAST_FPTOSI; 70 case Instruction::UIToFP : return bitc::CAST_UITOFP; 71 case Instruction::SIToFP : return bitc::CAST_SITOFP; 72 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 73 case Instruction::FPExt : return bitc::CAST_FPEXT; 74 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 75 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 76 case Instruction::BitCast : return bitc::CAST_BITCAST; 77 } 78} 79 80static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { 81 switch (Opcode) { 82 default: llvm_unreachable("Unknown binary instruction!"); 83 case Instruction::Add: 84 case Instruction::FAdd: return bitc::BINOP_ADD; 85 case Instruction::Sub: 86 case Instruction::FSub: return bitc::BINOP_SUB; 87 case Instruction::Mul: 88 case Instruction::FMul: return bitc::BINOP_MUL; 89 case Instruction::UDiv: return bitc::BINOP_UDIV; 90 case Instruction::FDiv: 91 case Instruction::SDiv: return bitc::BINOP_SDIV; 92 case Instruction::URem: return bitc::BINOP_UREM; 93 case Instruction::FRem: 94 case Instruction::SRem: return bitc::BINOP_SREM; 95 case Instruction::Shl: return bitc::BINOP_SHL; 96 case Instruction::LShr: return bitc::BINOP_LSHR; 97 case Instruction::AShr: return bitc::BINOP_ASHR; 98 case Instruction::And: return bitc::BINOP_AND; 99 case Instruction::Or: return bitc::BINOP_OR; 100 case Instruction::Xor: return bitc::BINOP_XOR; 101 } 102} 103 104 105 106static void WriteStringRecord(unsigned Code, const std::string &Str, 107 unsigned AbbrevToUse, BitstreamWriter &Stream) { 108 SmallVector<unsigned, 64> Vals; 109 110 // Code: [strchar x N] 111 for (unsigned i = 0, e = Str.size(); i != e; ++i) 112 Vals.push_back(Str[i]); 113 114 // Emit the finished record. 115 Stream.EmitRecord(Code, Vals, AbbrevToUse); 116} 117 118// Emit information about parameter attributes. 119static void WriteAttributeTable(const ValueEnumerator &VE, 120 BitstreamWriter &Stream) { 121 const std::vector<AttrListPtr> &Attrs = VE.getAttributes(); 122 if (Attrs.empty()) return; 123 124 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 125 126 SmallVector<uint64_t, 64> Record; 127 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 128 const AttrListPtr &A = Attrs[i]; 129 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) { 130 const AttributeWithIndex &PAWI = A.getSlot(i); 131 Record.push_back(PAWI.Index); 132 133 // FIXME: remove in LLVM 3.0 134 // Store the alignment in the bitcode as a 16-bit raw value instead of a 135 // 5-bit log2 encoded value. Shift the bits above the alignment up by 136 // 11 bits. 137 uint64_t FauxAttr = PAWI.Attrs & 0xffff; 138 if (PAWI.Attrs & Attribute::Alignment) 139 FauxAttr |= (1ull<<16)<<(((PAWI.Attrs & Attribute::Alignment)-1) >> 16); 140 FauxAttr |= (PAWI.Attrs & (0x3FFull << 21)) << 11; 141 142 Record.push_back(FauxAttr); 143 } 144 145 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 146 Record.clear(); 147 } 148 149 Stream.ExitBlock(); 150} 151 152/// WriteTypeTable - Write out the type table for a module. 153static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) { 154 const ValueEnumerator::TypeList &TypeList = VE.getTypes(); 155 156 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */); 157 SmallVector<uint64_t, 64> TypeVals; 158 159 // Abbrev for TYPE_CODE_POINTER. 160 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 161 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 162 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 163 Log2_32_Ceil(VE.getTypes().size()+1))); 164 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 165 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); 166 167 // Abbrev for TYPE_CODE_FUNCTION. 168 Abbv = new BitCodeAbbrev(); 169 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION)); 170 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg 171 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0 172 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 173 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 174 Log2_32_Ceil(VE.getTypes().size()+1))); 175 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); 176 177 // Abbrev for TYPE_CODE_STRUCT. 178 Abbv = new BitCodeAbbrev(); 179 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT)); 180 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked 181 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 182 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 183 Log2_32_Ceil(VE.getTypes().size()+1))); 184 unsigned StructAbbrev = Stream.EmitAbbrev(Abbv); 185 186 // Abbrev for TYPE_CODE_ARRAY. 187 Abbv = new BitCodeAbbrev(); 188 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 189 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size 190 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 191 Log2_32_Ceil(VE.getTypes().size()+1))); 192 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); 193 194 // Emit an entry count so the reader can reserve space. 195 TypeVals.push_back(TypeList.size()); 196 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 197 TypeVals.clear(); 198 199 // Loop over all of the types, emitting each in turn. 200 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 201 const Type *T = TypeList[i].first; 202 int AbbrevToUse = 0; 203 unsigned Code = 0; 204 205 switch (T->getTypeID()) { 206 default: llvm_unreachable("Unknown type!"); 207 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; 208 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; 209 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; 210 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; 211 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; 212 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 213 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; 214 case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break; 215 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break; 216 case Type::IntegerTyID: 217 // INTEGER: [width] 218 Code = bitc::TYPE_CODE_INTEGER; 219 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 220 break; 221 case Type::PointerTyID: { 222 const PointerType *PTy = cast<PointerType>(T); 223 // POINTER: [pointee type, address space] 224 Code = bitc::TYPE_CODE_POINTER; 225 TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 226 unsigned AddressSpace = PTy->getAddressSpace(); 227 TypeVals.push_back(AddressSpace); 228 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 229 break; 230 } 231 case Type::FunctionTyID: { 232 const FunctionType *FT = cast<FunctionType>(T); 233 // FUNCTION: [isvararg, attrid, retty, paramty x N] 234 Code = bitc::TYPE_CODE_FUNCTION; 235 TypeVals.push_back(FT->isVarArg()); 236 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0 237 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 238 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 239 TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 240 AbbrevToUse = FunctionAbbrev; 241 break; 242 } 243 case Type::StructTyID: { 244 const StructType *ST = cast<StructType>(T); 245 // STRUCT: [ispacked, eltty x N] 246 Code = bitc::TYPE_CODE_STRUCT; 247 TypeVals.push_back(ST->isPacked()); 248 // Output all of the element types. 249 for (StructType::element_iterator I = ST->element_begin(), 250 E = ST->element_end(); I != E; ++I) 251 TypeVals.push_back(VE.getTypeID(*I)); 252 AbbrevToUse = StructAbbrev; 253 break; 254 } 255 case Type::ArrayTyID: { 256 const ArrayType *AT = cast<ArrayType>(T); 257 // ARRAY: [numelts, eltty] 258 Code = bitc::TYPE_CODE_ARRAY; 259 TypeVals.push_back(AT->getNumElements()); 260 TypeVals.push_back(VE.getTypeID(AT->getElementType())); 261 AbbrevToUse = ArrayAbbrev; 262 break; 263 } 264 case Type::VectorTyID: { 265 const VectorType *VT = cast<VectorType>(T); 266 // VECTOR [numelts, eltty] 267 Code = bitc::TYPE_CODE_VECTOR; 268 TypeVals.push_back(VT->getNumElements()); 269 TypeVals.push_back(VE.getTypeID(VT->getElementType())); 270 break; 271 } 272 } 273 274 // Emit the finished record. 275 Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 276 TypeVals.clear(); 277 } 278 279 Stream.ExitBlock(); 280} 281 282static unsigned getEncodedLinkage(const GlobalValue *GV) { 283 switch (GV->getLinkage()) { 284 default: llvm_unreachable("Invalid linkage!"); 285 case GlobalValue::GhostLinkage: // Map ghost linkage onto external. 286 case GlobalValue::ExternalLinkage: return 0; 287 case GlobalValue::WeakAnyLinkage: return 1; 288 case GlobalValue::AppendingLinkage: return 2; 289 case GlobalValue::InternalLinkage: return 3; 290 case GlobalValue::LinkOnceAnyLinkage: return 4; 291 case GlobalValue::DLLImportLinkage: return 5; 292 case GlobalValue::DLLExportLinkage: return 6; 293 case GlobalValue::ExternalWeakLinkage: return 7; 294 case GlobalValue::CommonLinkage: return 8; 295 case GlobalValue::PrivateLinkage: return 9; 296 case GlobalValue::WeakODRLinkage: return 10; 297 case GlobalValue::LinkOnceODRLinkage: return 11; 298 case GlobalValue::AvailableExternallyLinkage: return 12; 299 case GlobalValue::LinkerPrivateLinkage: return 13; 300 } 301} 302 303static unsigned getEncodedVisibility(const GlobalValue *GV) { 304 switch (GV->getVisibility()) { 305 default: llvm_unreachable("Invalid visibility!"); 306 case GlobalValue::DefaultVisibility: return 0; 307 case GlobalValue::HiddenVisibility: return 1; 308 case GlobalValue::ProtectedVisibility: return 2; 309 } 310} 311 312// Emit top-level description of module, including target triple, inline asm, 313// descriptors for global variables, and function prototype info. 314static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE, 315 BitstreamWriter &Stream) { 316 // Emit the list of dependent libraries for the Module. 317 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I) 318 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream); 319 320 // Emit various pieces of data attached to a module. 321 if (!M->getTargetTriple().empty()) 322 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 323 0/*TODO*/, Stream); 324 if (!M->getDataLayout().empty()) 325 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 326 0/*TODO*/, Stream); 327 if (!M->getModuleInlineAsm().empty()) 328 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 329 0/*TODO*/, Stream); 330 331 // Emit information about sections and GC, computing how many there are. Also 332 // compute the maximum alignment value. 333 std::map<std::string, unsigned> SectionMap; 334 std::map<std::string, unsigned> GCMap; 335 unsigned MaxAlignment = 0; 336 unsigned MaxGlobalType = 0; 337 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 338 GV != E; ++GV) { 339 MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); 340 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); 341 342 if (!GV->hasSection()) continue; 343 // Give section names unique ID's. 344 unsigned &Entry = SectionMap[GV->getSection()]; 345 if (Entry != 0) continue; 346 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 347 0/*TODO*/, Stream); 348 Entry = SectionMap.size(); 349 } 350 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 351 MaxAlignment = std::max(MaxAlignment, F->getAlignment()); 352 if (F->hasSection()) { 353 // Give section names unique ID's. 354 unsigned &Entry = SectionMap[F->getSection()]; 355 if (!Entry) { 356 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 357 0/*TODO*/, Stream); 358 Entry = SectionMap.size(); 359 } 360 } 361 if (F->hasGC()) { 362 // Same for GC names. 363 unsigned &Entry = GCMap[F->getGC()]; 364 if (!Entry) { 365 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(), 366 0/*TODO*/, Stream); 367 Entry = GCMap.size(); 368 } 369 } 370 } 371 372 // Emit abbrev for globals, now that we know # sections and max alignment. 373 unsigned SimpleGVarAbbrev = 0; 374 if (!M->global_empty()) { 375 // Add an abbrev for common globals with no visibility or thread localness. 376 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 377 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 378 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 379 Log2_32_Ceil(MaxGlobalType+1))); 380 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. 381 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. 382 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage. 383 if (MaxAlignment == 0) // Alignment. 384 Abbv->Add(BitCodeAbbrevOp(0)); 385 else { 386 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; 387 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 388 Log2_32_Ceil(MaxEncAlignment+1))); 389 } 390 if (SectionMap.empty()) // Section. 391 Abbv->Add(BitCodeAbbrevOp(0)); 392 else 393 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 394 Log2_32_Ceil(SectionMap.size()+1))); 395 // Don't bother emitting vis + thread local. 396 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); 397 } 398 399 // Emit the global variable information. 400 SmallVector<unsigned, 64> Vals; 401 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); 402 GV != E; ++GV) { 403 unsigned AbbrevToUse = 0; 404 405 // GLOBALVAR: [type, isconst, initid, 406 // linkage, alignment, section, visibility, threadlocal] 407 Vals.push_back(VE.getTypeID(GV->getType())); 408 Vals.push_back(GV->isConstant()); 409 Vals.push_back(GV->isDeclaration() ? 0 : 410 (VE.getValueID(GV->getInitializer()) + 1)); 411 Vals.push_back(getEncodedLinkage(GV)); 412 Vals.push_back(Log2_32(GV->getAlignment())+1); 413 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); 414 if (GV->isThreadLocal() || 415 GV->getVisibility() != GlobalValue::DefaultVisibility) { 416 Vals.push_back(getEncodedVisibility(GV)); 417 Vals.push_back(GV->isThreadLocal()); 418 } else { 419 AbbrevToUse = SimpleGVarAbbrev; 420 } 421 422 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 423 Vals.clear(); 424 } 425 426 // Emit the function proto information. 427 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { 428 // FUNCTION: [type, callingconv, isproto, paramattr, 429 // linkage, alignment, section, visibility, gc] 430 Vals.push_back(VE.getTypeID(F->getType())); 431 Vals.push_back(F->getCallingConv()); 432 Vals.push_back(F->isDeclaration()); 433 Vals.push_back(getEncodedLinkage(F)); 434 Vals.push_back(VE.getAttributeID(F->getAttributes())); 435 Vals.push_back(Log2_32(F->getAlignment())+1); 436 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); 437 Vals.push_back(getEncodedVisibility(F)); 438 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0); 439 440 unsigned AbbrevToUse = 0; 441 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 442 Vals.clear(); 443 } 444 445 446 // Emit the alias information. 447 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); 448 AI != E; ++AI) { 449 Vals.push_back(VE.getTypeID(AI->getType())); 450 Vals.push_back(VE.getValueID(AI->getAliasee())); 451 Vals.push_back(getEncodedLinkage(AI)); 452 Vals.push_back(getEncodedVisibility(AI)); 453 unsigned AbbrevToUse = 0; 454 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 455 Vals.clear(); 456 } 457} 458 459static uint64_t GetOptimizationFlags(const Value *V) { 460 uint64_t Flags = 0; 461 462 if (const OverflowingBinaryOperator *OBO = 463 dyn_cast<OverflowingBinaryOperator>(V)) { 464 if (OBO->hasNoSignedOverflow()) 465 Flags |= 1 << bitc::OBO_NO_SIGNED_OVERFLOW; 466 if (OBO->hasNoUnsignedOverflow()) 467 Flags |= 1 << bitc::OBO_NO_UNSIGNED_OVERFLOW; 468 } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) { 469 if (Div->isExact()) 470 Flags |= 1 << bitc::SDIV_EXACT; 471 } 472 473 return Flags; 474} 475 476static void WriteMDNode(const MDNode *N, 477 const ValueEnumerator &VE, 478 BitstreamWriter &Stream, 479 SmallVector<uint64_t, 64> &Record) { 480 for (unsigned i = 0, e = N->getNumElements(); i != e; ++i) { 481 if (N->getElement(i)) { 482 Record.push_back(VE.getTypeID(N->getElement(i)->getType())); 483 Record.push_back(VE.getValueID(N->getElement(i))); 484 } else { 485 Record.push_back(VE.getTypeID(Type::VoidTy)); 486 Record.push_back(0); 487 } 488 } 489 Stream.EmitRecord(bitc::METADATA_NODE, Record, 0); 490 Record.clear(); 491} 492 493static void WriteModuleMetadata(const ValueEnumerator &VE, 494 BitstreamWriter &Stream) { 495 const ValueEnumerator::ValueList &Vals = VE.getValues(); 496 bool StartedMetadataBlock = false; 497 unsigned MDSAbbrev = 0; 498 SmallVector<uint64_t, 64> Record; 499 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 500 501 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) { 502 if (!StartedMetadataBlock) { 503 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 504 StartedMetadataBlock = true; 505 } 506 WriteMDNode(N, VE, Stream, Record); 507 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) { 508 if (!StartedMetadataBlock) { 509 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 510 511 // Abbrev for METADATA_STRING. 512 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 513 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING)); 514 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 515 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 516 MDSAbbrev = Stream.EmitAbbrev(Abbv); 517 StartedMetadataBlock = true; 518 } 519 520 // Code: [strchar x N] 521 const char *StrBegin = MDS->begin(); 522 for (unsigned i = 0, e = MDS->length(); i != e; ++i) 523 Record.push_back(StrBegin[i]); 524 525 // Emit the finished record. 526 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev); 527 Record.clear(); 528 } 529 } 530 531 if (StartedMetadataBlock) 532 Stream.ExitBlock(); 533} 534 535static void WriteConstants(unsigned FirstVal, unsigned LastVal, 536 const ValueEnumerator &VE, 537 BitstreamWriter &Stream, bool isGlobal) { 538 if (FirstVal == LastVal) return; 539 540 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 541 542 unsigned AggregateAbbrev = 0; 543 unsigned String8Abbrev = 0; 544 unsigned CString7Abbrev = 0; 545 unsigned CString6Abbrev = 0; 546 // If this is a constant pool for the module, emit module-specific abbrevs. 547 if (isGlobal) { 548 // Abbrev for CST_CODE_AGGREGATE. 549 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 550 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 551 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 552 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 553 AggregateAbbrev = Stream.EmitAbbrev(Abbv); 554 555 // Abbrev for CST_CODE_STRING. 556 Abbv = new BitCodeAbbrev(); 557 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 558 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 559 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 560 String8Abbrev = Stream.EmitAbbrev(Abbv); 561 // Abbrev for CST_CODE_CSTRING. 562 Abbv = new BitCodeAbbrev(); 563 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 564 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 565 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 566 CString7Abbrev = Stream.EmitAbbrev(Abbv); 567 // Abbrev for CST_CODE_CSTRING. 568 Abbv = new BitCodeAbbrev(); 569 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 570 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 571 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 572 CString6Abbrev = Stream.EmitAbbrev(Abbv); 573 } 574 575 SmallVector<uint64_t, 64> Record; 576 577 const ValueEnumerator::ValueList &Vals = VE.getValues(); 578 const Type *LastTy = 0; 579 for (unsigned i = FirstVal; i != LastVal; ++i) { 580 const Value *V = Vals[i].first; 581 if (isa<MDString>(V) || isa<MDNode>(V)) 582 continue; 583 // If we need to switch types, do so now. 584 if (V->getType() != LastTy) { 585 LastTy = V->getType(); 586 Record.push_back(VE.getTypeID(LastTy)); 587 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 588 CONSTANTS_SETTYPE_ABBREV); 589 Record.clear(); 590 } 591 592 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 593 Record.push_back(unsigned(IA->hasSideEffects())); 594 595 // Add the asm string. 596 const std::string &AsmStr = IA->getAsmString(); 597 Record.push_back(AsmStr.size()); 598 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) 599 Record.push_back(AsmStr[i]); 600 601 // Add the constraint string. 602 const std::string &ConstraintStr = IA->getConstraintString(); 603 Record.push_back(ConstraintStr.size()); 604 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) 605 Record.push_back(ConstraintStr[i]); 606 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 607 Record.clear(); 608 continue; 609 } 610 const Constant *C = cast<Constant>(V); 611 unsigned Code = -1U; 612 unsigned AbbrevToUse = 0; 613 if (C->isNullValue()) { 614 Code = bitc::CST_CODE_NULL; 615 } else if (isa<UndefValue>(C)) { 616 Code = bitc::CST_CODE_UNDEF; 617 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 618 if (IV->getBitWidth() <= 64) { 619 int64_t V = IV->getSExtValue(); 620 if (V >= 0) 621 Record.push_back(V << 1); 622 else 623 Record.push_back((-V << 1) | 1); 624 Code = bitc::CST_CODE_INTEGER; 625 AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 626 } else { // Wide integers, > 64 bits in size. 627 // We have an arbitrary precision integer value to write whose 628 // bit width is > 64. However, in canonical unsigned integer 629 // format it is likely that the high bits are going to be zero. 630 // So, we only write the number of active words. 631 unsigned NWords = IV->getValue().getActiveWords(); 632 const uint64_t *RawWords = IV->getValue().getRawData(); 633 for (unsigned i = 0; i != NWords; ++i) { 634 int64_t V = RawWords[i]; 635 if (V >= 0) 636 Record.push_back(V << 1); 637 else 638 Record.push_back((-V << 1) | 1); 639 } 640 Code = bitc::CST_CODE_WIDE_INTEGER; 641 } 642 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 643 Code = bitc::CST_CODE_FLOAT; 644 const Type *Ty = CFP->getType(); 645 if (Ty == Type::FloatTy || Ty == Type::DoubleTy) { 646 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 647 } else if (Ty == Type::X86_FP80Ty) { 648 // api needed to prevent premature destruction 649 // bits are not in the same order as a normal i80 APInt, compensate. 650 APInt api = CFP->getValueAPF().bitcastToAPInt(); 651 const uint64_t *p = api.getRawData(); 652 Record.push_back((p[1] << 48) | (p[0] >> 16)); 653 Record.push_back(p[0] & 0xffffLL); 654 } else if (Ty == Type::FP128Ty || Ty == Type::PPC_FP128Ty) { 655 APInt api = CFP->getValueAPF().bitcastToAPInt(); 656 const uint64_t *p = api.getRawData(); 657 Record.push_back(p[0]); 658 Record.push_back(p[1]); 659 } else { 660 assert (0 && "Unknown FP type!"); 661 } 662 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) { 663 // Emit constant strings specially. 664 unsigned NumOps = C->getNumOperands(); 665 // If this is a null-terminated string, use the denser CSTRING encoding. 666 if (C->getOperand(NumOps-1)->isNullValue()) { 667 Code = bitc::CST_CODE_CSTRING; 668 --NumOps; // Don't encode the null, which isn't allowed by char6. 669 } else { 670 Code = bitc::CST_CODE_STRING; 671 AbbrevToUse = String8Abbrev; 672 } 673 bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 674 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 675 for (unsigned i = 0; i != NumOps; ++i) { 676 unsigned char V = cast<ConstantInt>(C->getOperand(i))->getZExtValue(); 677 Record.push_back(V); 678 isCStr7 &= (V & 128) == 0; 679 if (isCStrChar6) 680 isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 681 } 682 683 if (isCStrChar6) 684 AbbrevToUse = CString6Abbrev; 685 else if (isCStr7) 686 AbbrevToUse = CString7Abbrev; 687 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) || 688 isa<ConstantVector>(V)) { 689 Code = bitc::CST_CODE_AGGREGATE; 690 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) 691 Record.push_back(VE.getValueID(C->getOperand(i))); 692 AbbrevToUse = AggregateAbbrev; 693 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 694 switch (CE->getOpcode()) { 695 default: 696 if (Instruction::isCast(CE->getOpcode())) { 697 Code = bitc::CST_CODE_CE_CAST; 698 Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); 699 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 700 Record.push_back(VE.getValueID(C->getOperand(0))); 701 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 702 } else { 703 assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 704 Code = bitc::CST_CODE_CE_BINOP; 705 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); 706 Record.push_back(VE.getValueID(C->getOperand(0))); 707 Record.push_back(VE.getValueID(C->getOperand(1))); 708 uint64_t Flags = GetOptimizationFlags(CE); 709 if (Flags != 0) 710 Record.push_back(Flags); 711 } 712 break; 713 case Instruction::GetElementPtr: 714 Code = bitc::CST_CODE_CE_GEP; 715 if (cast<GEPOperator>(C)->isInBounds()) 716 Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 717 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 718 Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 719 Record.push_back(VE.getValueID(C->getOperand(i))); 720 } 721 break; 722 case Instruction::Select: 723 Code = bitc::CST_CODE_CE_SELECT; 724 Record.push_back(VE.getValueID(C->getOperand(0))); 725 Record.push_back(VE.getValueID(C->getOperand(1))); 726 Record.push_back(VE.getValueID(C->getOperand(2))); 727 break; 728 case Instruction::ExtractElement: 729 Code = bitc::CST_CODE_CE_EXTRACTELT; 730 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 731 Record.push_back(VE.getValueID(C->getOperand(0))); 732 Record.push_back(VE.getValueID(C->getOperand(1))); 733 break; 734 case Instruction::InsertElement: 735 Code = bitc::CST_CODE_CE_INSERTELT; 736 Record.push_back(VE.getValueID(C->getOperand(0))); 737 Record.push_back(VE.getValueID(C->getOperand(1))); 738 Record.push_back(VE.getValueID(C->getOperand(2))); 739 break; 740 case Instruction::ShuffleVector: 741 // If the return type and argument types are the same, this is a 742 // standard shufflevector instruction. If the types are different, 743 // then the shuffle is widening or truncating the input vectors, and 744 // the argument type must also be encoded. 745 if (C->getType() == C->getOperand(0)->getType()) { 746 Code = bitc::CST_CODE_CE_SHUFFLEVEC; 747 } else { 748 Code = bitc::CST_CODE_CE_SHUFVEC_EX; 749 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 750 } 751 Record.push_back(VE.getValueID(C->getOperand(0))); 752 Record.push_back(VE.getValueID(C->getOperand(1))); 753 Record.push_back(VE.getValueID(C->getOperand(2))); 754 break; 755 case Instruction::ICmp: 756 case Instruction::FCmp: 757 Code = bitc::CST_CODE_CE_CMP; 758 Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 759 Record.push_back(VE.getValueID(C->getOperand(0))); 760 Record.push_back(VE.getValueID(C->getOperand(1))); 761 Record.push_back(CE->getPredicate()); 762 break; 763 } 764 } else { 765 llvm_unreachable("Unknown constant!"); 766 } 767 Stream.EmitRecord(Code, Record, AbbrevToUse); 768 Record.clear(); 769 } 770 771 Stream.ExitBlock(); 772} 773 774static void WriteModuleConstants(const ValueEnumerator &VE, 775 BitstreamWriter &Stream) { 776 const ValueEnumerator::ValueList &Vals = VE.getValues(); 777 778 // Find the first constant to emit, which is the first non-globalvalue value. 779 // We know globalvalues have been emitted by WriteModuleInfo. 780 for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 781 if (!isa<GlobalValue>(Vals[i].first)) { 782 WriteConstants(i, Vals.size(), VE, Stream, true); 783 return; 784 } 785 } 786} 787 788/// PushValueAndType - The file has to encode both the value and type id for 789/// many values, because we need to know what type to create for forward 790/// references. However, most operands are not forward references, so this type 791/// field is not needed. 792/// 793/// This function adds V's value ID to Vals. If the value ID is higher than the 794/// instruction ID, then it is a forward reference, and it also includes the 795/// type ID. 796static bool PushValueAndType(const Value *V, unsigned InstID, 797 SmallVector<unsigned, 64> &Vals, 798 ValueEnumerator &VE) { 799 unsigned ValID = VE.getValueID(V); 800 Vals.push_back(ValID); 801 if (ValID >= InstID) { 802 Vals.push_back(VE.getTypeID(V->getType())); 803 return true; 804 } 805 return false; 806} 807 808/// WriteInstruction - Emit an instruction to the specified stream. 809static void WriteInstruction(const Instruction &I, unsigned InstID, 810 ValueEnumerator &VE, BitstreamWriter &Stream, 811 SmallVector<unsigned, 64> &Vals) { 812 unsigned Code = 0; 813 unsigned AbbrevToUse = 0; 814 switch (I.getOpcode()) { 815 default: 816 if (Instruction::isCast(I.getOpcode())) { 817 Code = bitc::FUNC_CODE_INST_CAST; 818 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 819 AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 820 Vals.push_back(VE.getTypeID(I.getType())); 821 Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); 822 } else { 823 assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 824 Code = bitc::FUNC_CODE_INST_BINOP; 825 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 826 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 827 Vals.push_back(VE.getValueID(I.getOperand(1))); 828 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); 829 uint64_t Flags = GetOptimizationFlags(&I); 830 if (Flags != 0) { 831 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 832 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 833 Vals.push_back(Flags); 834 } 835 } 836 break; 837 838 case Instruction::GetElementPtr: 839 Code = bitc::FUNC_CODE_INST_GEP; 840 if (cast<GEPOperator>(&I)->isInBounds()) 841 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP; 842 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 843 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 844 break; 845 case Instruction::ExtractValue: { 846 Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 847 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 848 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 849 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) 850 Vals.push_back(*i); 851 break; 852 } 853 case Instruction::InsertValue: { 854 Code = bitc::FUNC_CODE_INST_INSERTVAL; 855 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 856 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 857 const InsertValueInst *IVI = cast<InsertValueInst>(&I); 858 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) 859 Vals.push_back(*i); 860 break; 861 } 862 case Instruction::Select: 863 Code = bitc::FUNC_CODE_INST_VSELECT; 864 PushValueAndType(I.getOperand(1), InstID, Vals, VE); 865 Vals.push_back(VE.getValueID(I.getOperand(2))); 866 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 867 break; 868 case Instruction::ExtractElement: 869 Code = bitc::FUNC_CODE_INST_EXTRACTELT; 870 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 871 Vals.push_back(VE.getValueID(I.getOperand(1))); 872 break; 873 case Instruction::InsertElement: 874 Code = bitc::FUNC_CODE_INST_INSERTELT; 875 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 876 Vals.push_back(VE.getValueID(I.getOperand(1))); 877 Vals.push_back(VE.getValueID(I.getOperand(2))); 878 break; 879 case Instruction::ShuffleVector: 880 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 881 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 882 Vals.push_back(VE.getValueID(I.getOperand(1))); 883 Vals.push_back(VE.getValueID(I.getOperand(2))); 884 break; 885 case Instruction::ICmp: 886 case Instruction::FCmp: 887 // compare returning Int1Ty or vector of Int1Ty 888 Code = bitc::FUNC_CODE_INST_CMP2; 889 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 890 Vals.push_back(VE.getValueID(I.getOperand(1))); 891 Vals.push_back(cast<CmpInst>(I).getPredicate()); 892 break; 893 894 case Instruction::Ret: 895 { 896 Code = bitc::FUNC_CODE_INST_RET; 897 unsigned NumOperands = I.getNumOperands(); 898 if (NumOperands == 0) 899 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 900 else if (NumOperands == 1) { 901 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) 902 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 903 } else { 904 for (unsigned i = 0, e = NumOperands; i != e; ++i) 905 PushValueAndType(I.getOperand(i), InstID, Vals, VE); 906 } 907 } 908 break; 909 case Instruction::Br: 910 { 911 Code = bitc::FUNC_CODE_INST_BR; 912 BranchInst &II(cast<BranchInst>(I)); 913 Vals.push_back(VE.getValueID(II.getSuccessor(0))); 914 if (II.isConditional()) { 915 Vals.push_back(VE.getValueID(II.getSuccessor(1))); 916 Vals.push_back(VE.getValueID(II.getCondition())); 917 } 918 } 919 break; 920 case Instruction::Switch: 921 Code = bitc::FUNC_CODE_INST_SWITCH; 922 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 923 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 924 Vals.push_back(VE.getValueID(I.getOperand(i))); 925 break; 926 case Instruction::Invoke: { 927 const InvokeInst *II = cast<InvokeInst>(&I); 928 const Value *Callee(II->getCalledValue()); 929 const PointerType *PTy = cast<PointerType>(Callee->getType()); 930 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 931 Code = bitc::FUNC_CODE_INST_INVOKE; 932 933 Vals.push_back(VE.getAttributeID(II->getAttributes())); 934 Vals.push_back(II->getCallingConv()); 935 Vals.push_back(VE.getValueID(II->getNormalDest())); 936 Vals.push_back(VE.getValueID(II->getUnwindDest())); 937 PushValueAndType(Callee, InstID, Vals, VE); 938 939 // Emit value #'s for the fixed parameters. 940 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 941 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param. 942 943 // Emit type/value pairs for varargs params. 944 if (FTy->isVarArg()) { 945 for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands(); 946 i != e; ++i) 947 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg 948 } 949 break; 950 } 951 case Instruction::Unwind: 952 Code = bitc::FUNC_CODE_INST_UNWIND; 953 break; 954 case Instruction::Unreachable: 955 Code = bitc::FUNC_CODE_INST_UNREACHABLE; 956 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 957 break; 958 959 case Instruction::PHI: 960 Code = bitc::FUNC_CODE_INST_PHI; 961 Vals.push_back(VE.getTypeID(I.getType())); 962 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 963 Vals.push_back(VE.getValueID(I.getOperand(i))); 964 break; 965 966 case Instruction::Malloc: 967 Code = bitc::FUNC_CODE_INST_MALLOC; 968 Vals.push_back(VE.getTypeID(I.getType())); 969 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 970 Vals.push_back(Log2_32(cast<MallocInst>(I).getAlignment())+1); 971 break; 972 973 case Instruction::Free: 974 Code = bitc::FUNC_CODE_INST_FREE; 975 PushValueAndType(I.getOperand(0), InstID, Vals, VE); 976 break; 977 978 case Instruction::Alloca: 979 Code = bitc::FUNC_CODE_INST_ALLOCA; 980 Vals.push_back(VE.getTypeID(I.getType())); 981 Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 982 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1); 983 break; 984 985 case Instruction::Load: 986 Code = bitc::FUNC_CODE_INST_LOAD; 987 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr 988 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 989 990 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1); 991 Vals.push_back(cast<LoadInst>(I).isVolatile()); 992 break; 993 case Instruction::Store: 994 Code = bitc::FUNC_CODE_INST_STORE2; 995 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr 996 Vals.push_back(VE.getValueID(I.getOperand(0))); // val. 997 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1); 998 Vals.push_back(cast<StoreInst>(I).isVolatile()); 999 break; 1000 case Instruction::Call: { 1001 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType()); 1002 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1003 1004 Code = bitc::FUNC_CODE_INST_CALL; 1005 1006 const CallInst *CI = cast<CallInst>(&I); 1007 Vals.push_back(VE.getAttributeID(CI->getAttributes())); 1008 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall())); 1009 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee 1010 1011 // Emit value #'s for the fixed parameters. 1012 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 1013 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param. 1014 1015 // Emit type/value pairs for varargs params. 1016 if (FTy->isVarArg()) { 1017 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams(); 1018 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands(); 1019 i != e; ++i) 1020 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs 1021 } 1022 break; 1023 } 1024 case Instruction::VAArg: 1025 Code = bitc::FUNC_CODE_INST_VAARG; 1026 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty 1027 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. 1028 Vals.push_back(VE.getTypeID(I.getType())); // restype. 1029 break; 1030 } 1031 1032 Stream.EmitRecord(Code, Vals, AbbrevToUse); 1033 Vals.clear(); 1034} 1035 1036// Emit names for globals/functions etc. 1037static void WriteValueSymbolTable(const ValueSymbolTable &VST, 1038 const ValueEnumerator &VE, 1039 BitstreamWriter &Stream) { 1040 if (VST.empty()) return; 1041 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 1042 1043 // FIXME: Set up the abbrev, we know how many values there are! 1044 // FIXME: We know if the type names can use 7-bit ascii. 1045 SmallVector<unsigned, 64> NameVals; 1046 1047 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); 1048 SI != SE; ++SI) { 1049 1050 const ValueName &Name = *SI; 1051 1052 // Figure out the encoding to use for the name. 1053 bool is7Bit = true; 1054 bool isChar6 = true; 1055 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); 1056 C != E; ++C) { 1057 if (isChar6) 1058 isChar6 = BitCodeAbbrevOp::isChar6(*C); 1059 if ((unsigned char)*C & 128) { 1060 is7Bit = false; 1061 break; // don't bother scanning the rest. 1062 } 1063 } 1064 1065 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 1066 1067 // VST_ENTRY: [valueid, namechar x N] 1068 // VST_BBENTRY: [bbid, namechar x N] 1069 unsigned Code; 1070 if (isa<BasicBlock>(SI->getValue())) { 1071 Code = bitc::VST_CODE_BBENTRY; 1072 if (isChar6) 1073 AbbrevToUse = VST_BBENTRY_6_ABBREV; 1074 } else { 1075 Code = bitc::VST_CODE_ENTRY; 1076 if (isChar6) 1077 AbbrevToUse = VST_ENTRY_6_ABBREV; 1078 else if (is7Bit) 1079 AbbrevToUse = VST_ENTRY_7_ABBREV; 1080 } 1081 1082 NameVals.push_back(VE.getValueID(SI->getValue())); 1083 for (const char *P = Name.getKeyData(), 1084 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) 1085 NameVals.push_back((unsigned char)*P); 1086 1087 // Emit the finished record. 1088 Stream.EmitRecord(Code, NameVals, AbbrevToUse); 1089 NameVals.clear(); 1090 } 1091 Stream.ExitBlock(); 1092} 1093 1094/// WriteFunction - Emit a function body to the module stream. 1095static void WriteFunction(const Function &F, ValueEnumerator &VE, 1096 BitstreamWriter &Stream) { 1097 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 1098 VE.incorporateFunction(F); 1099 1100 SmallVector<unsigned, 64> Vals; 1101 1102 // Emit the number of basic blocks, so the reader can create them ahead of 1103 // time. 1104 Vals.push_back(VE.getBasicBlocks().size()); 1105 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 1106 Vals.clear(); 1107 1108 // If there are function-local constants, emit them now. 1109 unsigned CstStart, CstEnd; 1110 VE.getFunctionConstantRange(CstStart, CstEnd); 1111 WriteConstants(CstStart, CstEnd, VE, Stream, false); 1112 1113 // Keep a running idea of what the instruction ID is. 1114 unsigned InstID = CstEnd; 1115 1116 // Finally, emit all the instructions, in order. 1117 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 1118 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 1119 I != E; ++I) { 1120 WriteInstruction(*I, InstID, VE, Stream, Vals); 1121 if (I->getType() != Type::VoidTy) 1122 ++InstID; 1123 } 1124 1125 // Emit names for all the instructions etc. 1126 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); 1127 1128 VE.purgeFunction(); 1129 Stream.ExitBlock(); 1130} 1131 1132/// WriteTypeSymbolTable - Emit a block for the specified type symtab. 1133static void WriteTypeSymbolTable(const TypeSymbolTable &TST, 1134 const ValueEnumerator &VE, 1135 BitstreamWriter &Stream) { 1136 if (TST.empty()) return; 1137 1138 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3); 1139 1140 // 7-bit fixed width VST_CODE_ENTRY strings. 1141 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1142 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1143 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1144 Log2_32_Ceil(VE.getTypes().size()+1))); 1145 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1146 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1147 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv); 1148 1149 SmallVector<unsigned, 64> NameVals; 1150 1151 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end(); 1152 TI != TE; ++TI) { 1153 // TST_ENTRY: [typeid, namechar x N] 1154 NameVals.push_back(VE.getTypeID(TI->second)); 1155 1156 const std::string &Str = TI->first; 1157 bool is7Bit = true; 1158 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 1159 NameVals.push_back((unsigned char)Str[i]); 1160 if (Str[i] & 128) 1161 is7Bit = false; 1162 } 1163 1164 // Emit the finished record. 1165 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0); 1166 NameVals.clear(); 1167 } 1168 1169 Stream.ExitBlock(); 1170} 1171 1172// Emit blockinfo, which defines the standard abbreviations etc. 1173static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) { 1174 // We only want to emit block info records for blocks that have multiple 1175 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other 1176 // blocks can defined their abbrevs inline. 1177 Stream.EnterBlockInfoBlock(2); 1178 1179 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. 1180 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1181 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 1182 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1183 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1184 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 1185 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1186 Abbv) != VST_ENTRY_8_ABBREV) 1187 llvm_unreachable("Unexpected abbrev ordering!"); 1188 } 1189 1190 { // 7-bit fixed width VST_ENTRY strings. 1191 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1192 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1193 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1194 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1195 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 1196 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1197 Abbv) != VST_ENTRY_7_ABBREV) 1198 llvm_unreachable("Unexpected abbrev ordering!"); 1199 } 1200 { // 6-bit char6 VST_ENTRY strings. 1201 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1202 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 1203 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1204 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1205 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1206 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1207 Abbv) != VST_ENTRY_6_ABBREV) 1208 llvm_unreachable("Unexpected abbrev ordering!"); 1209 } 1210 { // 6-bit char6 VST_BBENTRY strings. 1211 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1212 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 1213 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1214 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 1215 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 1216 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, 1217 Abbv) != VST_BBENTRY_6_ABBREV) 1218 llvm_unreachable("Unexpected abbrev ordering!"); 1219 } 1220 1221 1222 1223 { // SETTYPE abbrev for CONSTANTS_BLOCK. 1224 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1225 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 1226 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1227 Log2_32_Ceil(VE.getTypes().size()+1))); 1228 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1229 Abbv) != CONSTANTS_SETTYPE_ABBREV) 1230 llvm_unreachable("Unexpected abbrev ordering!"); 1231 } 1232 1233 { // INTEGER abbrev for CONSTANTS_BLOCK. 1234 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1235 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 1236 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 1237 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1238 Abbv) != CONSTANTS_INTEGER_ABBREV) 1239 llvm_unreachable("Unexpected abbrev ordering!"); 1240 } 1241 1242 { // CE_CAST abbrev for CONSTANTS_BLOCK. 1243 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1244 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 1245 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc 1246 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid 1247 Log2_32_Ceil(VE.getTypes().size()+1))); 1248 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 1249 1250 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1251 Abbv) != CONSTANTS_CE_CAST_Abbrev) 1252 llvm_unreachable("Unexpected abbrev ordering!"); 1253 } 1254 { // NULL abbrev for CONSTANTS_BLOCK. 1255 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1256 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 1257 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, 1258 Abbv) != CONSTANTS_NULL_Abbrev) 1259 llvm_unreachable("Unexpected abbrev ordering!"); 1260 } 1261 1262 // FIXME: This should only use space for first class types! 1263 1264 { // INST_LOAD abbrev for FUNCTION_BLOCK. 1265 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1266 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 1267 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 1268 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 1269 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 1270 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1271 Abbv) != FUNCTION_INST_LOAD_ABBREV) 1272 llvm_unreachable("Unexpected abbrev ordering!"); 1273 } 1274 { // INST_BINOP abbrev for FUNCTION_BLOCK. 1275 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1276 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1277 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1278 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1279 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1280 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1281 Abbv) != FUNCTION_INST_BINOP_ABBREV) 1282 llvm_unreachable("Unexpected abbrev ordering!"); 1283 } 1284 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 1285 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1286 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 1287 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 1288 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 1289 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1290 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags 1291 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1292 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV) 1293 llvm_unreachable("Unexpected abbrev ordering!"); 1294 } 1295 { // INST_CAST abbrev for FUNCTION_BLOCK. 1296 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1297 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 1298 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal 1299 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 1300 Log2_32_Ceil(VE.getTypes().size()+1))); 1301 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 1302 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1303 Abbv) != FUNCTION_INST_CAST_ABBREV) 1304 llvm_unreachable("Unexpected abbrev ordering!"); 1305 } 1306 1307 { // INST_RET abbrev for FUNCTION_BLOCK. 1308 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1309 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1310 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1311 Abbv) != FUNCTION_INST_RET_VOID_ABBREV) 1312 llvm_unreachable("Unexpected abbrev ordering!"); 1313 } 1314 { // INST_RET abbrev for FUNCTION_BLOCK. 1315 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1316 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 1317 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 1318 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1319 Abbv) != FUNCTION_INST_RET_VAL_ABBREV) 1320 llvm_unreachable("Unexpected abbrev ordering!"); 1321 } 1322 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 1323 BitCodeAbbrev *Abbv = new BitCodeAbbrev(); 1324 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 1325 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, 1326 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) 1327 llvm_unreachable("Unexpected abbrev ordering!"); 1328 } 1329 1330 Stream.ExitBlock(); 1331} 1332 1333 1334/// WriteModule - Emit the specified module to the bitstream. 1335static void WriteModule(const Module *M, BitstreamWriter &Stream) { 1336 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 1337 1338 // Emit the version number if it is non-zero. 1339 if (CurVersion) { 1340 SmallVector<unsigned, 1> Vals; 1341 Vals.push_back(CurVersion); 1342 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); 1343 } 1344 1345 // Analyze the module, enumerating globals, functions, etc. 1346 ValueEnumerator VE(M); 1347 1348 // Emit blockinfo, which defines the standard abbreviations etc. 1349 WriteBlockInfo(VE, Stream); 1350 1351 // Emit information about parameter attributes. 1352 WriteAttributeTable(VE, Stream); 1353 1354 // Emit information describing all of the types in the module. 1355 WriteTypeTable(VE, Stream); 1356 1357 // Emit top-level description of module, including target triple, inline asm, 1358 // descriptors for global variables, and function prototype info. 1359 WriteModuleInfo(M, VE, Stream); 1360 1361 // Emit constants. 1362 WriteModuleConstants(VE, Stream); 1363 1364 // Emit metadata. 1365 WriteModuleMetadata(VE, Stream); 1366 1367 // Emit function bodies. 1368 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) 1369 if (!I->isDeclaration()) 1370 WriteFunction(*I, VE, Stream); 1371 1372 // Emit the type symbol table information. 1373 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream); 1374 1375 // Emit names for globals/functions etc. 1376 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); 1377 1378 Stream.ExitBlock(); 1379} 1380 1381/// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a 1382/// header and trailer to make it compatible with the system archiver. To do 1383/// this we emit the following header, and then emit a trailer that pads the 1384/// file out to be a multiple of 16 bytes. 1385/// 1386/// struct bc_header { 1387/// uint32_t Magic; // 0x0B17C0DE 1388/// uint32_t Version; // Version, currently always 0. 1389/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. 1390/// uint32_t BitcodeSize; // Size of traditional bitcode file. 1391/// uint32_t CPUType; // CPU specifier. 1392/// ... potentially more later ... 1393/// }; 1394enum { 1395 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. 1396 DarwinBCHeaderSize = 5*4 1397}; 1398 1399static void EmitDarwinBCHeader(BitstreamWriter &Stream, 1400 const std::string &TT) { 1401 unsigned CPUType = ~0U; 1402 1403 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*. The CPUType is a 1404 // magic number from /usr/include/mach/machine.h. It is ok to reproduce the 1405 // specific constants here because they are implicitly part of the Darwin ABI. 1406 enum { 1407 DARWIN_CPU_ARCH_ABI64 = 0x01000000, 1408 DARWIN_CPU_TYPE_X86 = 7, 1409 DARWIN_CPU_TYPE_POWERPC = 18 1410 }; 1411 1412 if (TT.find("x86_64-") == 0) 1413 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 1414 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' && 1415 TT[4] == '-' && TT[1] - '3' < 6) 1416 CPUType = DARWIN_CPU_TYPE_X86; 1417 else if (TT.find("powerpc-") == 0) 1418 CPUType = DARWIN_CPU_TYPE_POWERPC; 1419 else if (TT.find("powerpc64-") == 0) 1420 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 1421 1422 // Traditional Bitcode starts after header. 1423 unsigned BCOffset = DarwinBCHeaderSize; 1424 1425 Stream.Emit(0x0B17C0DE, 32); 1426 Stream.Emit(0 , 32); // Version. 1427 Stream.Emit(BCOffset , 32); 1428 Stream.Emit(0 , 32); // Filled in later. 1429 Stream.Emit(CPUType , 32); 1430} 1431 1432/// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and 1433/// finalize the header. 1434static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) { 1435 // Update the size field in the header. 1436 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize); 1437 1438 // If the file is not a multiple of 16 bytes, insert dummy padding. 1439 while (BufferSize & 15) { 1440 Stream.Emit(0, 8); 1441 ++BufferSize; 1442 } 1443} 1444 1445 1446/// WriteBitcodeToFile - Write the specified module to the specified output 1447/// stream. 1448void llvm::WriteBitcodeToFile(const Module *M, std::ostream &Out) { 1449 raw_os_ostream RawOut(Out); 1450 // If writing to stdout, set binary mode. 1451 if (llvm::cout == Out) 1452 sys::Program::ChangeStdoutToBinary(); 1453 WriteBitcodeToFile(M, RawOut); 1454} 1455 1456/// WriteBitcodeToFile - Write the specified module to the specified output 1457/// stream. 1458void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { 1459 std::vector<unsigned char> Buffer; 1460 BitstreamWriter Stream(Buffer); 1461 1462 Buffer.reserve(256*1024); 1463 1464 WriteBitcodeToStream( M, Stream ); 1465 1466 // If writing to stdout, set binary mode. 1467 if (&llvm::outs() == &Out) 1468 sys::Program::ChangeStdoutToBinary(); 1469 1470 // Write the generated bitstream to "Out". 1471 Out.write((char*)&Buffer.front(), Buffer.size()); 1472 1473 // Make sure it hits disk now. 1474 Out.flush(); 1475} 1476 1477/// WriteBitcodeToStream - Write the specified module to the specified output 1478/// stream. 1479void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) { 1480 // If this is darwin, emit a file header and trailer if needed. 1481 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos; 1482 if (isDarwin) 1483 EmitDarwinBCHeader(Stream, M->getTargetTriple()); 1484 1485 // Emit the file header. 1486 Stream.Emit((unsigned)'B', 8); 1487 Stream.Emit((unsigned)'C', 8); 1488 Stream.Emit(0x0, 4); 1489 Stream.Emit(0xC, 4); 1490 Stream.Emit(0xE, 4); 1491 Stream.Emit(0xD, 4); 1492 1493 // Emit the module. 1494 WriteModule(M, Stream); 1495 1496 if (isDarwin) 1497 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size()); 1498} 1499